Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

171 files changed, 29298 insertions, 0 deletions

diff --git a/third_party/libwebrtc/common_audio/BUILD.gn b/third_party/libwebrtc/common_audio/BUILD.gn
new file mode 100644
index 0000000000..79d9321bbd
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/BUILD.gn
@@ -0,0 +1,391 @@
+# Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import("../webrtc.gni")
+
+visibility = [ ":*" ]
+
+rtc_library("common_audio") {
+  visibility += [ "*" ]
+  sources = [
+    "audio_converter.cc",
+    "audio_converter.h",
+    "audio_util.cc",
+    "channel_buffer.cc",
+    "channel_buffer.h",
+    "include/audio_util.h",
+    "real_fourier.cc",
+    "real_fourier.h",
+    "real_fourier_ooura.cc",
+    "real_fourier_ooura.h",
+    "resampler/include/push_resampler.h",
+    "resampler/include/resampler.h",
+    "resampler/push_resampler.cc",
+    "resampler/push_sinc_resampler.cc",
+    "resampler/push_sinc_resampler.h",
+    "resampler/resampler.cc",
+    "resampler/sinc_resampler.cc",
+    "smoothing_filter.cc",
+    "smoothing_filter.h",
+    "vad/include/vad.h",
+    "vad/vad.cc",
+    "wav_file.cc",
+    "wav_file.h",
+    "wav_header.cc",
+    "wav_header.h",
+    "window_generator.cc",
+    "window_generator.h",
+  ]
+
+  deps = [
+    ":common_audio_c",
+    ":sinc_resampler",
+    "../api:array_view",
+    "../rtc_base:checks",
+    "../rtc_base:gtest_prod",
+    "../rtc_base:logging",
+    "../rtc_base:safe_conversions",
+    "../rtc_base:sanitizer",
+    "../rtc_base:timeutils",
+    "../rtc_base/memory:aligned_malloc",
+    "../rtc_base/system:arch",
+    "../rtc_base/system:file_wrapper",
+    "../system_wrappers",
+    "third_party/ooura:fft_size_256",
+  ]
+  absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+
+  defines = []
+
+  if (rtc_build_with_neon) {
+    deps += [ ":common_audio_neon" ]
+  }
+
+  if (target_cpu == "x86" || target_cpu == "x64") {
+    deps += [ ":common_audio_sse2" ]
+    deps += [ ":common_audio_avx2" ]
+  }
+}
+
+rtc_source_set("mock_common_audio") {
+  visibility += webrtc_default_visibility
+  testonly = true
+  sources = [
+    "mocks/mock_smoothing_filter.h",
+    "vad/mock/mock_vad.h",
+  ]
+  deps = [
+    ":common_audio",
+    "../test:test_support",
+  ]
+}
+
+rtc_source_set("common_audio_c_arm_asm") {
+  sources = []
+  deps = []
+  if (target_cpu == "arm") {
+    sources += [ "signal_processing/complex_bit_reverse_arm.S" ]
+
+    if (arm_version >= 7) {
+      sources += [ "signal_processing/filter_ar_fast_q12_armv7.S" ]
+    } else {
+      sources += [ "signal_processing/filter_ar_fast_q12.c" ]
+    }
+    deps += [ "../rtc_base/system:asm_defines" ]
+  }
+}
+
+rtc_library("common_audio_c") {
+  visibility += webrtc_default_visibility
+  sources = [
+    "ring_buffer.c",
+    "ring_buffer.h",
+    "signal_processing/auto_corr_to_refl_coef.c",
+    "signal_processing/auto_correlation.c",
+    "signal_processing/complex_fft_tables.h",
+    "signal_processing/copy_set_operations.c",
+    "signal_processing/cross_correlation.c",
+    "signal_processing/division_operations.c",
+    "signal_processing/downsample_fast.c",
+    "signal_processing/energy.c",
+    "signal_processing/filter_ar.c",
+    "signal_processing/filter_ma_fast_q12.c",
+    "signal_processing/get_hanning_window.c",
+    "signal_processing/get_scaling_square.c",
+    "signal_processing/ilbc_specific_functions.c",
+    "signal_processing/include/real_fft.h",
+    "signal_processing/include/signal_processing_library.h",
+    "signal_processing/include/spl_inl.h",
+    "signal_processing/include/spl_inl_armv7.h",
+    "signal_processing/levinson_durbin.c",
+    "signal_processing/lpc_to_refl_coef.c",
+    "signal_processing/min_max_operations.c",
+    "signal_processing/randomization_functions.c",
+    "signal_processing/real_fft.c",
+    "signal_processing/refl_coef_to_lpc.c",
+    "signal_processing/resample.c",
+    "signal_processing/resample_48khz.c",
+    "signal_processing/resample_by_2.c",
+    "signal_processing/resample_by_2_internal.c",
+    "signal_processing/resample_by_2_internal.h",
+    "signal_processing/resample_fractional.c",
+    "signal_processing/spl_init.c",
+    "signal_processing/spl_inl.c",
+    "signal_processing/spl_sqrt.c",
+    "signal_processing/splitting_filter.c",
+    "signal_processing/sqrt_of_one_minus_x_squared.c",
+    "signal_processing/vector_scaling_operations.c",
+    "vad/include/webrtc_vad.h",
+    "vad/vad_core.c",
+    "vad/vad_core.h",
+    "vad/vad_filterbank.c",
+    "vad/vad_filterbank.h",
+    "vad/vad_gmm.c",
+    "vad/vad_gmm.h",
+    "vad/vad_sp.c",
+    "vad/vad_sp.h",
+    "vad/webrtc_vad.c",
+  ]
+
+  if (target_cpu == "mipsel") {
+    sources += [
+      "signal_processing/complex_bit_reverse_mips.c",
+      "signal_processing/complex_fft_mips.c",
+      "signal_processing/cross_correlation_mips.c",
+      "signal_processing/downsample_fast_mips.c",
+      "signal_processing/filter_ar_fast_q12_mips.c",
+      "signal_processing/include/spl_inl_mips.h",
+      "signal_processing/min_max_operations_mips.c",
+      "signal_processing/resample_by_2_mips.c",
+    ]
+    if (mips_dsp_rev > 0) {
+      sources += [ "signal_processing/vector_scaling_operations_mips.c" ]
+    }
+  } else {
+    sources += [ "signal_processing/complex_fft.c" ]
+  }
+
+  if (target_cpu != "arm" && target_cpu != "mipsel") {
+    sources += [
+      "signal_processing/complex_bit_reverse.c",
+      "signal_processing/filter_ar_fast_q12.c",
+    ]
+  }
+
+  deps = [
+    ":common_audio_c_arm_asm",
+    ":common_audio_cc",
+    "../rtc_base:checks",
+    "../rtc_base:compile_assert_c",
+    "../rtc_base:sanitizer",
+    "../rtc_base/system:arch",
+    "../system_wrappers",
+    "third_party/ooura:fft_size_256",
+    "third_party/spl_sqrt_floor",
+  ]
+}
+
+rtc_library("common_audio_cc") {
+  sources = [
+    "signal_processing/dot_product_with_scale.cc",
+    "signal_processing/dot_product_with_scale.h",
+  ]
+
+  deps = [
+    "../rtc_base:safe_conversions",
+    "../system_wrappers",
+  ]
+}
+
+rtc_source_set("sinc_resampler") {
+  sources = [ "resampler/sinc_resampler.h" ]
+  deps = [
+    "../rtc_base:gtest_prod",
+    "../rtc_base/memory:aligned_malloc",
+    "../rtc_base/system:arch",
+    "../system_wrappers",
+  ]
+}
+
+rtc_source_set("fir_filter") {
+  visibility += webrtc_default_visibility
+  sources = [ "fir_filter.h" ]
+}
+
+rtc_library("fir_filter_factory") {
+  visibility += webrtc_default_visibility
+  sources = [
+    "fir_filter_c.cc",
+    "fir_filter_c.h",
+    "fir_filter_factory.cc",
+    "fir_filter_factory.h",
+  ]
+  deps = [
+    ":fir_filter",
+    "../rtc_base:checks",
+    "../rtc_base/system:arch",
+    "../system_wrappers",
+  ]
+  if (target_cpu == "x86" || target_cpu == "x64") {
+    deps += [ ":common_audio_sse2" ]
+    deps += [ ":common_audio_avx2" ]
+  }
+  if (rtc_build_with_neon) {
+    deps += [ ":common_audio_neon" ]
+  }
+}
+
+if (target_cpu == "x86" || target_cpu == "x64") {
+  rtc_library("common_audio_sse2") {
+    sources = [
+      "fir_filter_sse.cc",
+      "fir_filter_sse.h",
+      "resampler/sinc_resampler_sse.cc",
+    ]
+
+    if (is_posix || is_fuchsia) {
+      cflags = [ "-msse2" ]
+    }
+
+    deps = [
+      ":fir_filter",
+      ":sinc_resampler",
+      "../rtc_base:checks",
+      "../rtc_base/memory:aligned_malloc",
+    ]
+  }
+
+  rtc_library("common_audio_avx2") {
+    sources = [
+      "fir_filter_avx2.cc",
+      "fir_filter_avx2.h",
+      "resampler/sinc_resampler_avx2.cc",
+    ]
+
+      cflags = [
+        "-mavx2",
+        "-mfma",
+      ]
+
+    deps = [
+      ":fir_filter",
+      ":sinc_resampler",
+      "../rtc_base:checks",
+      "../rtc_base/memory:aligned_malloc",
+    ]
+  }
+}
+
+if (rtc_build_with_neon) {
+  rtc_library("common_audio_neon") {
+    sources = [
+      "fir_filter_neon.cc",
+      "fir_filter_neon.h",
+      "resampler/sinc_resampler_neon.cc",
+    ]
+
+    if (target_cpu != "arm64") {
+      # Enable compilation for the NEON instruction set.
+      suppressed_configs += [ "//build/config/compiler:compiler_arm_fpu" ]
+      cflags = [ "-mfpu=neon" ]
+    }
+
+    deps = [
+      ":common_audio_neon_c",
+      ":fir_filter",
+      ":sinc_resampler",
+      "../rtc_base:checks",
+      "../rtc_base/memory:aligned_malloc",
+    ]
+  }
+
+  rtc_library("common_audio_neon_c") {
+    visibility += webrtc_default_visibility
+    sources = [
+      "signal_processing/cross_correlation_neon.c",
+      "signal_processing/downsample_fast_neon.c",
+      "signal_processing/min_max_operations_neon.c",
+    ]
+
+    if (target_cpu != "arm64") {
+      # Enable compilation for the NEON instruction set.
+      suppressed_configs += [ "//build/config/compiler:compiler_arm_fpu" ]
+      cflags = [ "-mfpu=neon" ]
+    }
+
+    deps = [
+      ":common_audio_c",
+      "../rtc_base:checks",
+      "../rtc_base/system:arch",
+    ]
+  }
+}
+
+if (rtc_include_tests && !build_with_chromium) {
+  rtc_test("common_audio_unittests") {
+    visibility += webrtc_default_visibility
+    testonly = true
+
+    sources = [
+      "audio_converter_unittest.cc",
+      "audio_util_unittest.cc",
+      "channel_buffer_unittest.cc",
+      "fir_filter_unittest.cc",
+      "real_fourier_unittest.cc",
+      "resampler/push_resampler_unittest.cc",
+      "resampler/push_sinc_resampler_unittest.cc",
+      "resampler/resampler_unittest.cc",
+      "resampler/sinusoidal_linear_chirp_source.cc",
+      "resampler/sinusoidal_linear_chirp_source.h",
+      "ring_buffer_unittest.cc",
+      "signal_processing/real_fft_unittest.cc",
+      "signal_processing/signal_processing_unittest.cc",
+      "smoothing_filter_unittest.cc",
+      "vad/vad_core_unittest.cc",
+      "vad/vad_filterbank_unittest.cc",
+      "vad/vad_gmm_unittest.cc",
+      "vad/vad_sp_unittest.cc",
+      "vad/vad_unittest.cc",
+      "vad/vad_unittest.h",
+      "wav_file_unittest.cc",
+      "wav_header_unittest.cc",
+      "window_generator_unittest.cc",
+    ]
+
+    # Does not compile on iOS for arm: webrtc:5544.
+    if (!is_ios || target_cpu != "arm") {
+      sources += [ "resampler/sinc_resampler_unittest.cc" ]
+    }
+
+    deps = [
+      ":common_audio",
+      ":common_audio_c",
+      ":fir_filter",
+      ":fir_filter_factory",
+      ":sinc_resampler",
+      "../rtc_base:checks",
+      "../rtc_base:macromagic",
+      "../rtc_base:rtc_base_tests_utils",
+      "../rtc_base:stringutils",
+      "../rtc_base:timeutils",
+      "../rtc_base/system:arch",
+      "../system_wrappers",
+      "../test:fileutils",
+      "../test:rtc_expect_death",
+      "../test:test_main",
+      "../test:test_support",
+      "//testing/gtest",
+    ]
+
+    if (is_android) {
+      deps += [ "//testing/android/native_test:native_test_support" ]
+
+      shard_timeout = 900
+    }
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/DEPS b/third_party/libwebrtc/common_audio/DEPS
new file mode 100644
index 0000000000..8a9adf19f9
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/DEPS
@@ -0,0 +1,3 @@
+include_rules = [
+  "+system_wrappers",
+]
diff --git a/third_party/libwebrtc/common_audio/OWNERS b/third_party/libwebrtc/common_audio/OWNERS
new file mode 100644
index 0000000000..4cb53169b3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/OWNERS
@@ -0,0 +1,3 @@
+henrik.lundin@webrtc.org
+minyue@webrtc.org
+peah@webrtc.org
diff --git a/third_party/libwebrtc/common_audio/audio_converter.cc b/third_party/libwebrtc/common_audio/audio_converter.cc
new file mode 100644
index 0000000000..485ec80c56
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/audio_converter.cc
@@ -0,0 +1,219 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/audio_converter.h"
+
+#include <cstring>
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "common_audio/channel_buffer.h"
+#include "common_audio/resampler/push_sinc_resampler.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/numerics/safe_conversions.h"
+
+namespace webrtc {
+
+class CopyConverter : public AudioConverter {
+ public:
+  CopyConverter(size_t src_channels,
+                size_t src_frames,
+                size_t dst_channels,
+                size_t dst_frames)
+      : AudioConverter(src_channels, src_frames, dst_channels, dst_frames) {}
+  ~CopyConverter() override {}
+
+  void Convert(const float* const* src,
+               size_t src_size,
+               float* const* dst,
+               size_t dst_capacity) override {
+    CheckSizes(src_size, dst_capacity);
+    if (src != dst) {
+      for (size_t i = 0; i < src_channels(); ++i)
+        std::memcpy(dst[i], src[i], dst_frames() * sizeof(*dst[i]));
+    }
+  }
+};
+
+class UpmixConverter : public AudioConverter {
+ public:
+  UpmixConverter(size_t src_channels,
+                 size_t src_frames,
+                 size_t dst_channels,
+                 size_t dst_frames)
+      : AudioConverter(src_channels, src_frames, dst_channels, dst_frames) {}
+  ~UpmixConverter() override {}
+
+  void Convert(const float* const* src,
+               size_t src_size,
+               float* const* dst,
+               size_t dst_capacity) override {
+    CheckSizes(src_size, dst_capacity);
+    for (size_t i = 0; i < dst_frames(); ++i) {
+      const float value = src[0][i];
+      for (size_t j = 0; j < dst_channels(); ++j)
+        dst[j][i] = value;
+    }
+  }
+};
+
+class DownmixConverter : public AudioConverter {
+ public:
+  DownmixConverter(size_t src_channels,
+                   size_t src_frames,
+                   size_t dst_channels,
+                   size_t dst_frames)
+      : AudioConverter(src_channels, src_frames, dst_channels, dst_frames) {}
+  ~DownmixConverter() override {}
+
+  void Convert(const float* const* src,
+               size_t src_size,
+               float* const* dst,
+               size_t dst_capacity) override {
+    CheckSizes(src_size, dst_capacity);
+    float* dst_mono = dst[0];
+    for (size_t i = 0; i < src_frames(); ++i) {
+      float sum = 0;
+      for (size_t j = 0; j < src_channels(); ++j)
+        sum += src[j][i];
+      dst_mono[i] = sum / src_channels();
+    }
+  }
+};
+
+class ResampleConverter : public AudioConverter {
+ public:
+  ResampleConverter(size_t src_channels,
+                    size_t src_frames,
+                    size_t dst_channels,
+                    size_t dst_frames)
+      : AudioConverter(src_channels, src_frames, dst_channels, dst_frames) {
+    resamplers_.reserve(src_channels);
+    for (size_t i = 0; i < src_channels; ++i)
+      resamplers_.push_back(std::unique_ptr<PushSincResampler>(
+          new PushSincResampler(src_frames, dst_frames)));
+  }
+  ~ResampleConverter() override {}
+
+  void Convert(const float* const* src,
+               size_t src_size,
+               float* const* dst,
+               size_t dst_capacity) override {
+    CheckSizes(src_size, dst_capacity);
+    for (size_t i = 0; i < resamplers_.size(); ++i)
+      resamplers_[i]->Resample(src[i], src_frames(), dst[i], dst_frames());
+  }
+
+ private:
+  std::vector<std::unique_ptr<PushSincResampler>> resamplers_;
+};
+
+// Apply a vector of converters in serial, in the order given. At least two
+// converters must be provided.
+class CompositionConverter : public AudioConverter {
+ public:
+  explicit CompositionConverter(
+      std::vector<std::unique_ptr<AudioConverter>> converters)
+      : converters_(std::move(converters)) {
+    RTC_CHECK_GE(converters_.size(), 2);
+    // We need an intermediate buffer after every converter.
+    for (auto it = converters_.begin(); it != converters_.end() - 1; ++it)
+      buffers_.push_back(
+          std::unique_ptr<ChannelBuffer<float>>(new ChannelBuffer<float>(
+              (*it)->dst_frames(), (*it)->dst_channels())));
+  }
+  ~CompositionConverter() override {}
+
+  void Convert(const float* const* src,
+               size_t src_size,
+               float* const* dst,
+               size_t dst_capacity) override {
+    converters_.front()->Convert(src, src_size, buffers_.front()->channels(),
+                                 buffers_.front()->size());
+    for (size_t i = 2; i < converters_.size(); ++i) {
+      auto& src_buffer = buffers_[i - 2];
+      auto& dst_buffer = buffers_[i - 1];
+      converters_[i]->Convert(src_buffer->channels(), src_buffer->size(),
+                              dst_buffer->channels(), dst_buffer->size());
+    }
+    converters_.back()->Convert(buffers_.back()->channels(),
+                                buffers_.back()->size(), dst, dst_capacity);
+  }
+
+ private:
+  std::vector<std::unique_ptr<AudioConverter>> converters_;
+  std::vector<std::unique_ptr<ChannelBuffer<float>>> buffers_;
+};
+
+std::unique_ptr<AudioConverter> AudioConverter::Create(size_t src_channels,
+                                                       size_t src_frames,
+                                                       size_t dst_channels,
+                                                       size_t dst_frames) {
+  std::unique_ptr<AudioConverter> sp;
+  if (src_channels > dst_channels) {
+    if (src_frames != dst_frames) {
+      std::vector<std::unique_ptr<AudioConverter>> converters;
+      converters.push_back(std::unique_ptr<AudioConverter>(new DownmixConverter(
+          src_channels, src_frames, dst_channels, src_frames)));
+      converters.push_back(
+          std::unique_ptr<AudioConverter>(new ResampleConverter(
+              dst_channels, src_frames, dst_channels, dst_frames)));
+      sp.reset(new CompositionConverter(std::move(converters)));
+    } else {
+      sp.reset(new DownmixConverter(src_channels, src_frames, dst_channels,
+                                    dst_frames));
+    }
+  } else if (src_channels < dst_channels) {
+    if (src_frames != dst_frames) {
+      std::vector<std::unique_ptr<AudioConverter>> converters;
+      converters.push_back(
+          std::unique_ptr<AudioConverter>(new ResampleConverter(
+              src_channels, src_frames, src_channels, dst_frames)));
+      converters.push_back(std::unique_ptr<AudioConverter>(new UpmixConverter(
+          src_channels, dst_frames, dst_channels, dst_frames)));
+      sp.reset(new CompositionConverter(std::move(converters)));
+    } else {
+      sp.reset(new UpmixConverter(src_channels, src_frames, dst_channels,
+                                  dst_frames));
+    }
+  } else if (src_frames != dst_frames) {
+    sp.reset(new ResampleConverter(src_channels, src_frames, dst_channels,
+                                   dst_frames));
+  } else {
+    sp.reset(
+        new CopyConverter(src_channels, src_frames, dst_channels, dst_frames));
+  }
+
+  return sp;
+}
+
+// For CompositionConverter.
+AudioConverter::AudioConverter()
+    : src_channels_(0), src_frames_(0), dst_channels_(0), dst_frames_(0) {}
+
+AudioConverter::AudioConverter(size_t src_channels,
+                               size_t src_frames,
+                               size_t dst_channels,
+                               size_t dst_frames)
+    : src_channels_(src_channels),
+      src_frames_(src_frames),
+      dst_channels_(dst_channels),
+      dst_frames_(dst_frames) {
+  RTC_CHECK(dst_channels == src_channels || dst_channels == 1 ||
+            src_channels == 1);
+}
+
+void AudioConverter::CheckSizes(size_t src_size, size_t dst_capacity) const {
+  RTC_CHECK_EQ(src_size, src_channels() * src_frames());
+  RTC_CHECK_GE(dst_capacity, dst_channels() * dst_frames());
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/audio_converter.h b/third_party/libwebrtc/common_audio/audio_converter.h
new file mode 100644
index 0000000000..4afbb6d0fd
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/audio_converter.h
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_AUDIO_CONVERTER_H_
+#define COMMON_AUDIO_AUDIO_CONVERTER_H_
+
+#include <stddef.h>
+
+#include <memory>
+
+namespace webrtc {
+
+// Format conversion (remixing and resampling) for audio. Only simple remixing
+// conversions are supported: downmix to mono (i.e. `dst_channels` == 1) or
+// upmix from mono (i.e. |src_channels == 1|).
+//
+// The source and destination chunks have the same duration in time; specifying
+// the number of frames is equivalent to specifying the sample rates.
+class AudioConverter {
+ public:
+  // Returns a new AudioConverter, which will use the supplied format for its
+  // lifetime. Caller is responsible for the memory.
+  static std::unique_ptr<AudioConverter> Create(size_t src_channels,
+                                                size_t src_frames,
+                                                size_t dst_channels,
+                                                size_t dst_frames);
+  virtual ~AudioConverter() {}
+
+  AudioConverter(const AudioConverter&) = delete;
+  AudioConverter& operator=(const AudioConverter&) = delete;
+
+  // Convert `src`, containing `src_size` samples, to `dst`, having a sample
+  // capacity of `dst_capacity`. Both point to a series of buffers containing
+  // the samples for each channel. The sizes must correspond to the format
+  // passed to Create().
+  virtual void Convert(const float* const* src,
+                       size_t src_size,
+                       float* const* dst,
+                       size_t dst_capacity) = 0;
+
+  size_t src_channels() const { return src_channels_; }
+  size_t src_frames() const { return src_frames_; }
+  size_t dst_channels() const { return dst_channels_; }
+  size_t dst_frames() const { return dst_frames_; }
+
+ protected:
+  AudioConverter();
+  AudioConverter(size_t src_channels,
+                 size_t src_frames,
+                 size_t dst_channels,
+                 size_t dst_frames);
+
+  // Helper to RTC_CHECK that inputs are correctly sized.
+  void CheckSizes(size_t src_size, size_t dst_capacity) const;
+
+ private:
+  const size_t src_channels_;
+  const size_t src_frames_;
+  const size_t dst_channels_;
+  const size_t dst_frames_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_AUDIO_CONVERTER_H_
diff --git a/third_party/libwebrtc/common_audio/audio_converter_unittest.cc b/third_party/libwebrtc/common_audio/audio_converter_unittest.cc
new file mode 100644
index 0000000000..7fbd06d1b4
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/audio_converter_unittest.cc
@@ -0,0 +1,159 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/audio_converter.h"
+
+#include <algorithm>
+#include <cmath>
+#include <memory>
+#include <vector>
+
+#include "common_audio/channel_buffer.h"
+#include "common_audio/resampler/push_sinc_resampler.h"
+#include "rtc_base/arraysize.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+
+typedef std::unique_ptr<ChannelBuffer<float>> ScopedBuffer;
+
+// Sets the signal value to increase by `data` with every sample.
+ScopedBuffer CreateBuffer(const std::vector<float>& data, size_t frames) {
+  const size_t num_channels = data.size();
+  ScopedBuffer sb(new ChannelBuffer<float>(frames, num_channels));
+  for (size_t i = 0; i < num_channels; ++i)
+    for (size_t j = 0; j < frames; ++j)
+      sb->channels()[i][j] = data[i] * j;
+  return sb;
+}
+
+void VerifyParams(const ChannelBuffer<float>& ref,
+                  const ChannelBuffer<float>& test) {
+  EXPECT_EQ(ref.num_channels(), test.num_channels());
+  EXPECT_EQ(ref.num_frames(), test.num_frames());
+}
+
+// Computes the best SNR based on the error between `ref_frame` and
+// `test_frame`. It searches around `expected_delay` in samples between the
+// signals to compensate for the resampling delay.
+float ComputeSNR(const ChannelBuffer<float>& ref,
+                 const ChannelBuffer<float>& test,
+                 size_t expected_delay) {
+  VerifyParams(ref, test);
+  float best_snr = 0;
+  size_t best_delay = 0;
+
+  // Search within one sample of the expected delay.
+  for (size_t delay = std::max(expected_delay, static_cast<size_t>(1)) - 1;
+       delay <= std::min(expected_delay + 1, ref.num_frames()); ++delay) {
+    float mse = 0;
+    float variance = 0;
+    float mean = 0;
+    for (size_t i = 0; i < ref.num_channels(); ++i) {
+      for (size_t j = 0; j < ref.num_frames() - delay; ++j) {
+        float error = ref.channels()[i][j] - test.channels()[i][j + delay];
+        mse += error * error;
+        variance += ref.channels()[i][j] * ref.channels()[i][j];
+        mean += ref.channels()[i][j];
+      }
+    }
+
+    const size_t length = ref.num_channels() * (ref.num_frames() - delay);
+    mse /= length;
+    variance /= length;
+    mean /= length;
+    variance -= mean * mean;
+    float snr = 100;  // We assign 100 dB to the zero-error case.
+    if (mse > 0)
+      snr = 10 * std::log10(variance / mse);
+    if (snr > best_snr) {
+      best_snr = snr;
+      best_delay = delay;
+    }
+  }
+  printf("SNR=%.1f dB at delay=%zu\n", best_snr, best_delay);
+  return best_snr;
+}
+
+// Sets the source to a linearly increasing signal for which we can easily
+// generate a reference. Runs the AudioConverter and ensures the output has
+// sufficiently high SNR relative to the reference.
+void RunAudioConverterTest(size_t src_channels,
+                           int src_sample_rate_hz,
+                           size_t dst_channels,
+                           int dst_sample_rate_hz) {
+  const float kSrcLeft = 0.0002f;
+  const float kSrcRight = 0.0001f;
+  const float resampling_factor =
+      (1.f * src_sample_rate_hz) / dst_sample_rate_hz;
+  const float dst_left = resampling_factor * kSrcLeft;
+  const float dst_right = resampling_factor * kSrcRight;
+  const float dst_mono = (dst_left + dst_right) / 2;
+  const size_t src_frames = static_cast<size_t>(src_sample_rate_hz / 100);
+  const size_t dst_frames = static_cast<size_t>(dst_sample_rate_hz / 100);
+
+  std::vector<float> src_data(1, kSrcLeft);
+  if (src_channels == 2)
+    src_data.push_back(kSrcRight);
+  ScopedBuffer src_buffer = CreateBuffer(src_data, src_frames);
+
+  std::vector<float> dst_data(1, 0);
+  std::vector<float> ref_data;
+  if (dst_channels == 1) {
+    if (src_channels == 1)
+      ref_data.push_back(dst_left);
+    else
+      ref_data.push_back(dst_mono);
+  } else {
+    dst_data.push_back(0);
+    ref_data.push_back(dst_left);
+    if (src_channels == 1)
+      ref_data.push_back(dst_left);
+    else
+      ref_data.push_back(dst_right);
+  }
+  ScopedBuffer dst_buffer = CreateBuffer(dst_data, dst_frames);
+  ScopedBuffer ref_buffer = CreateBuffer(ref_data, dst_frames);
+
+  // The sinc resampler has a known delay, which we compute here.
+  const size_t delay_frames =
+      src_sample_rate_hz == dst_sample_rate_hz
+          ? 0
+          : static_cast<size_t>(
+                PushSincResampler::AlgorithmicDelaySeconds(src_sample_rate_hz) *
+                dst_sample_rate_hz);
+  // SNR reported on the same line later.
+  printf("(%zu, %d Hz) -> (%zu, %d Hz) ", src_channels, src_sample_rate_hz,
+         dst_channels, dst_sample_rate_hz);
+
+  std::unique_ptr<AudioConverter> converter = AudioConverter::Create(
+      src_channels, src_frames, dst_channels, dst_frames);
+  converter->Convert(src_buffer->channels(), src_buffer->size(),
+                     dst_buffer->channels(), dst_buffer->size());
+
+  EXPECT_LT(43.f,
+            ComputeSNR(*ref_buffer.get(), *dst_buffer.get(), delay_frames));
+}
+
+TEST(AudioConverterTest, ConversionsPassSNRThreshold) {
+  const int kSampleRates[] = {8000, 11025, 16000, 22050, 32000, 44100, 48000};
+  const int kChannels[] = {1, 2};
+  for (int src_rate : kSampleRates) {
+    for (int dst_rate : kSampleRates) {
+      for (size_t src_channels : kChannels) {
+        for (size_t dst_channels : kChannels) {
+          RunAudioConverterTest(src_channels, src_rate, dst_channels, dst_rate);
+        }
+      }
+    }
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/audio_util.cc b/third_party/libwebrtc/common_audio/audio_util.cc
new file mode 100644
index 0000000000..b1e4d9ac3c
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/audio_util.cc
@@ -0,0 +1,54 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/include/audio_util.h"
+
+namespace webrtc {
+
+void FloatToS16(const float* src, size_t size, int16_t* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatToS16(src[i]);
+}
+
+void S16ToFloat(const int16_t* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = S16ToFloat(src[i]);
+}
+
+void S16ToFloatS16(const int16_t* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = src[i];
+}
+
+void FloatS16ToS16(const float* src, size_t size, int16_t* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatS16ToS16(src[i]);
+}
+
+void FloatToFloatS16(const float* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatToFloatS16(src[i]);
+}
+
+void FloatS16ToFloat(const float* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatS16ToFloat(src[i]);
+}
+
+template <>
+void DownmixInterleavedToMono<int16_t>(const int16_t* interleaved,
+                                       size_t num_frames,
+                                       int num_channels,
+                                       int16_t* deinterleaved) {
+  DownmixInterleavedToMonoImpl<int16_t, int32_t>(interleaved, num_frames,
+                                                 num_channels, deinterleaved);
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/audio_util_unittest.cc b/third_party/libwebrtc/common_audio/audio_util_unittest.cc
new file mode 100644
index 0000000000..a215a123b1
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/audio_util_unittest.cc
@@ -0,0 +1,250 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/include/audio_util.h"
+
+#include "rtc_base/arraysize.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace {
+
+using ::testing::ElementsAreArray;
+
+void ExpectArraysEq(const int16_t* ref, const int16_t* test, size_t length) {
+  for (size_t i = 0; i < length; ++i) {
+    EXPECT_EQ(ref[i], test[i]);
+  }
+}
+
+void ExpectArraysEq(const float* ref, const float* test, size_t length) {
+  for (size_t i = 0; i < length; ++i) {
+    EXPECT_NEAR(ref[i], test[i], 0.01f);
+  }
+}
+
+TEST(AudioUtilTest, S16ToFloat) {
+  static constexpr int16_t kInput[] = {0, 1, -1, 16384, -16384, 32767, -32768};
+  static constexpr float kReference[] = {
+      0.f, 1.f / 32767.f, -1.f / 32768.f, 16384.f / 32767.f, -0.5f, 1.f, -1.f};
+  static constexpr size_t kSize = arraysize(kInput);
+  static_assert(arraysize(kReference) == kSize, "");
+  float output[kSize];
+  S16ToFloat(kInput, kSize, output);
+  ExpectArraysEq(kReference, output, kSize);
+}
+
+TEST(AudioUtilTest, FloatS16ToS16) {
+  static constexpr float kInput[] = {0.f,   0.4f,    0.5f,    -0.4f,
+                                     -0.5f, 32768.f, -32769.f};
+  static constexpr int16_t kReference[] = {0, 0, 1, 0, -1, 32767, -32768};
+  static constexpr size_t kSize = arraysize(kInput);
+  static_assert(arraysize(kReference) == kSize, "");
+  int16_t output[kSize];
+  FloatS16ToS16(kInput, kSize, output);
+  ExpectArraysEq(kReference, output, kSize);
+}
+
+TEST(AudioUtilTest, FloatToFloatS16) {
+  static constexpr float kInput[] = {0.f,
+                                     0.4f / 32768.f,
+                                     0.6f / 32768.f,
+                                     -0.4f / 32768.f,
+                                     -0.6f / 32768.f,
+                                     1.f,
+                                     -1.f,
+                                     1.f,
+                                     -1.f};
+  static constexpr float kReference[] = {
+      0.f, 0.4f, 0.6f, -0.4f, -0.6f, 32768.f, -32768.f, 32768.f, -32768.f};
+  static constexpr size_t kSize = arraysize(kInput);
+  static_assert(arraysize(kReference) == kSize, "");
+  float output[kSize];
+  FloatToFloatS16(kInput, kSize, output);
+  ExpectArraysEq(kReference, output, kSize);
+}
+
+TEST(AudioUtilTest, FloatS16ToFloat) {
+  static constexpr float kInput[] = {0.f,     0.4f,     0.6f,    -0.4f,   -0.6f,
+                                     32767.f, -32768.f, 32767.f, -32768.f};
+  static constexpr float kReference[] = {0.f,
+                                         0.4f / 32768.f,
+                                         0.6f / 32768.f,
+                                         -0.4f / 32768.f,
+                                         -0.6f / 32768.f,
+                                         1.f,
+                                         -1.f,
+                                         1.f,
+                                         -1.f};
+  static constexpr size_t kSize = arraysize(kInput);
+  static_assert(arraysize(kReference) == kSize, "");
+  float output[kSize];
+  FloatS16ToFloat(kInput, kSize, output);
+  ExpectArraysEq(kReference, output, kSize);
+}
+
+TEST(AudioUtilTest, DbfsToFloatS16) {
+  static constexpr float kInput[] = {-90.f, -70.f, -30.f, -20.f, -10.f,
+                                     -5.f,  -1.f,  0.f,   1.f};
+  static constexpr float kReference[] = {
+      1.036215186f, 10.36215115f, 1036.215088f, 3276.800049f, 10362.15137f,
+      18426.80078f, 29204.51172f, 32768.f,      36766.30078f};
+  static constexpr size_t kSize = arraysize(kInput);
+  static_assert(arraysize(kReference) == kSize, "");
+  float output[kSize];
+  for (size_t i = 0; i < kSize; ++i) {
+    output[i] = DbfsToFloatS16(kInput[i]);
+  }
+  ExpectArraysEq(kReference, output, kSize);
+}
+
+TEST(AudioUtilTest, FloatS16ToDbfs) {
+  static constexpr float kInput[] = {1.036215143f, 10.36215143f,  1036.215143f,
+                                     3276.8f,      10362.151436f, 18426.800543f,
+                                     29204.51074f, 32768.0f,      36766.30071f};
+
+  static constexpr float kReference[] = {
+      -90.f, -70.f, -30.f, -20.f, -10.f, -5.f, -1.f, 0.f, 0.9999923706f};
+  static constexpr size_t kSize = arraysize(kInput);
+  static_assert(arraysize(kReference) == kSize, "");
+
+  float output[kSize];
+  for (size_t i = 0; i < kSize; ++i) {
+    output[i] = FloatS16ToDbfs(kInput[i]);
+  }
+  ExpectArraysEq(kReference, output, kSize);
+}
+
+TEST(AudioUtilTest, InterleavingStereo) {
+  const int16_t kInterleaved[] = {2, 3, 4, 9, 8, 27, 16, 81};
+  const size_t kSamplesPerChannel = 4;
+  const int kNumChannels = 2;
+  const size_t kLength = kSamplesPerChannel * kNumChannels;
+  int16_t left[kSamplesPerChannel], right[kSamplesPerChannel];
+  int16_t* deinterleaved[] = {left, right};
+  Deinterleave(kInterleaved, kSamplesPerChannel, kNumChannels, deinterleaved);
+  const int16_t kRefLeft[] = {2, 4, 8, 16};
+  const int16_t kRefRight[] = {3, 9, 27, 81};
+  ExpectArraysEq(kRefLeft, left, kSamplesPerChannel);
+  ExpectArraysEq(kRefRight, right, kSamplesPerChannel);
+
+  int16_t interleaved[kLength];
+  Interleave(deinterleaved, kSamplesPerChannel, kNumChannels, interleaved);
+  ExpectArraysEq(kInterleaved, interleaved, kLength);
+}
+
+TEST(AudioUtilTest, InterleavingMonoIsIdentical) {
+  const int16_t kInterleaved[] = {1, 2, 3, 4, 5};
+  const size_t kSamplesPerChannel = 5;
+  const int kNumChannels = 1;
+  int16_t mono[kSamplesPerChannel];
+  int16_t* deinterleaved[] = {mono};
+  Deinterleave(kInterleaved, kSamplesPerChannel, kNumChannels, deinterleaved);
+  ExpectArraysEq(kInterleaved, mono, kSamplesPerChannel);
+
+  int16_t interleaved[kSamplesPerChannel];
+  Interleave(deinterleaved, kSamplesPerChannel, kNumChannels, interleaved);
+  ExpectArraysEq(mono, interleaved, kSamplesPerChannel);
+}
+
+TEST(AudioUtilTest, DownmixInterleavedToMono) {
+  {
+    const size_t kNumFrames = 4;
+    const int kNumChannels = 1;
+    const int16_t interleaved[kNumChannels * kNumFrames] = {1, 2, -1, -3};
+    int16_t deinterleaved[kNumFrames];
+
+    DownmixInterleavedToMono(interleaved, kNumFrames, kNumChannels,
+                             deinterleaved);
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(interleaved));
+  }
+  {
+    const size_t kNumFrames = 2;
+    const int kNumChannels = 2;
+    const int16_t interleaved[kNumChannels * kNumFrames] = {10, 20, -10, -30};
+    int16_t deinterleaved[kNumFrames];
+
+    DownmixInterleavedToMono(interleaved, kNumFrames, kNumChannels,
+                             deinterleaved);
+    const int16_t expected[kNumFrames] = {15, -20};
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
+  }
+  {
+    const size_t kNumFrames = 3;
+    const int kNumChannels = 3;
+    const int16_t interleaved[kNumChannels * kNumFrames] = {
+        30000, 30000, 24001, -5, -10, -20, -30000, -30999, -30000};
+    int16_t deinterleaved[kNumFrames];
+
+    DownmixInterleavedToMono(interleaved, kNumFrames, kNumChannels,
+                             deinterleaved);
+    const int16_t expected[kNumFrames] = {28000, -11, -30333};
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
+  }
+}
+
+TEST(AudioUtilTest, DownmixToMonoTest) {
+  {
+    const size_t kNumFrames = 4;
+    const int kNumChannels = 1;
+    const float input_data[kNumChannels][kNumFrames] = {{1.f, 2.f, -1.f, -3.f}};
+    const float* input[kNumChannels];
+    for (int i = 0; i < kNumChannels; ++i) {
+      input[i] = input_data[i];
+    }
+
+    float downmixed[kNumFrames];
+
+    DownmixToMono<float, float>(input, kNumFrames, kNumChannels, downmixed);
+
+    EXPECT_THAT(downmixed, ElementsAreArray(input_data[0]));
+  }
+  {
+    const size_t kNumFrames = 3;
+    const int kNumChannels = 2;
+    const float input_data[kNumChannels][kNumFrames] = {{1.f, 2.f, -1.f},
+                                                        {3.f, 0.f, 1.f}};
+    const float* input[kNumChannels];
+    for (int i = 0; i < kNumChannels; ++i) {
+      input[i] = input_data[i];
+    }
+
+    float downmixed[kNumFrames];
+    const float expected[kNumFrames] = {2.f, 1.f, 0.f};
+
+    DownmixToMono<float, float>(input, kNumFrames, kNumChannels, downmixed);
+
+    EXPECT_THAT(downmixed, ElementsAreArray(expected));
+  }
+  {
+    const size_t kNumFrames = 3;
+    const int kNumChannels = 3;
+    const int16_t input_data[kNumChannels][kNumFrames] = {
+        {30000, -5, -30000}, {30000, -10, -30999}, {24001, -20, -30000}};
+    const int16_t* input[kNumChannels];
+    for (int i = 0; i < kNumChannels; ++i) {
+      input[i] = input_data[i];
+    }
+
+    int16_t downmixed[kNumFrames];
+    const int16_t expected[kNumFrames] = {28000, -11, -30333};
+
+    DownmixToMono<int16_t, int32_t>(input, kNumFrames, kNumChannels, downmixed);
+
+    EXPECT_THAT(downmixed, ElementsAreArray(expected));
+  }
+}
+
+}  // namespace
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/channel_buffer.cc b/third_party/libwebrtc/common_audio/channel_buffer.cc
new file mode 100644
index 0000000000..b9b8c25e37
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/channel_buffer.cc
@@ -0,0 +1,80 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/channel_buffer.h"
+
+#include <cstdint>
+
+#include "common_audio/include/audio_util.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+IFChannelBuffer::IFChannelBuffer(size_t num_frames,
+                                 size_t num_channels,
+                                 size_t num_bands)
+    : ivalid_(true),
+      ibuf_(num_frames, num_channels, num_bands),
+      fvalid_(true),
+      fbuf_(num_frames, num_channels, num_bands) {}
+
+IFChannelBuffer::~IFChannelBuffer() = default;
+
+ChannelBuffer<int16_t>* IFChannelBuffer::ibuf() {
+  RefreshI();
+  fvalid_ = false;
+  return &ibuf_;
+}
+
+ChannelBuffer<float>* IFChannelBuffer::fbuf() {
+  RefreshF();
+  ivalid_ = false;
+  return &fbuf_;
+}
+
+const ChannelBuffer<int16_t>* IFChannelBuffer::ibuf_const() const {
+  RefreshI();
+  return &ibuf_;
+}
+
+const ChannelBuffer<float>* IFChannelBuffer::fbuf_const() const {
+  RefreshF();
+  return &fbuf_;
+}
+
+void IFChannelBuffer::RefreshF() const {
+  if (!fvalid_) {
+    RTC_DCHECK(ivalid_);
+    fbuf_.set_num_channels(ibuf_.num_channels());
+    const int16_t* const* int_channels = ibuf_.channels();
+    float* const* float_channels = fbuf_.channels();
+    for (size_t i = 0; i < ibuf_.num_channels(); ++i) {
+      for (size_t j = 0; j < ibuf_.num_frames(); ++j) {
+        float_channels[i][j] = int_channels[i][j];
+      }
+    }
+    fvalid_ = true;
+  }
+}
+
+void IFChannelBuffer::RefreshI() const {
+  if (!ivalid_) {
+    RTC_DCHECK(fvalid_);
+    int16_t* const* int_channels = ibuf_.channels();
+    ibuf_.set_num_channels(fbuf_.num_channels());
+    const float* const* float_channels = fbuf_.channels();
+    for (size_t i = 0; i < fbuf_.num_channels(); ++i) {
+      FloatS16ToS16(float_channels[i], ibuf_.num_frames(), int_channels[i]);
+    }
+    ivalid_ = true;
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/channel_buffer.h b/third_party/libwebrtc/common_audio/channel_buffer.h
new file mode 100644
index 0000000000..9f08d6089b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/channel_buffer.h
@@ -0,0 +1,215 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_CHANNEL_BUFFER_H_
+#define COMMON_AUDIO_CHANNEL_BUFFER_H_
+
+#include <string.h>
+
+#include <memory>
+#include <vector>
+
+#include "api/array_view.h"
+#include "common_audio/include/audio_util.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/gtest_prod_util.h"
+
+namespace webrtc {
+
+// Helper to encapsulate a contiguous data buffer, full or split into frequency
+// bands, with access to a pointer arrays of the deinterleaved channels and
+// bands. The buffer is zero initialized at creation.
+//
+// The buffer structure is showed below for a 2 channel and 2 bands case:
+//
+// `data_`:
+// { [ --- b1ch1 --- ] [ --- b2ch1 --- ] [ --- b1ch2 --- ] [ --- b2ch2 --- ] }
+//
+// The pointer arrays for the same example are as follows:
+//
+// `channels_`:
+// { [ b1ch1* ] [ b1ch2* ] [ b2ch1* ] [ b2ch2* ] }
+//
+// `bands_`:
+// { [ b1ch1* ] [ b2ch1* ] [ b1ch2* ] [ b2ch2* ] }
+template <typename T>
+class ChannelBuffer {
+ public:
+  ChannelBuffer(size_t num_frames, size_t num_channels, size_t num_bands = 1)
+      : data_(new T[num_frames * num_channels]()),
+        channels_(new T*[num_channels * num_bands]),
+        bands_(new T*[num_channels * num_bands]),
+        num_frames_(num_frames),
+        num_frames_per_band_(num_frames / num_bands),
+        num_allocated_channels_(num_channels),
+        num_channels_(num_channels),
+        num_bands_(num_bands),
+        bands_view_(num_allocated_channels_,
+                    std::vector<rtc::ArrayView<T>>(num_bands_)),
+        channels_view_(
+            num_bands_,
+            std::vector<rtc::ArrayView<T>>(num_allocated_channels_)) {
+    // Temporarily cast away const_ness to allow populating the array views.
+    auto* bands_view =
+        const_cast<std::vector<std::vector<rtc::ArrayView<T>>>*>(&bands_view_);
+    auto* channels_view =
+        const_cast<std::vector<std::vector<rtc::ArrayView<T>>>*>(
+            &channels_view_);
+
+    for (size_t ch = 0; ch < num_allocated_channels_; ++ch) {
+      for (size_t band = 0; band < num_bands_; ++band) {
+        (*channels_view)[band][ch] = rtc::ArrayView<T>(
+            &data_[ch * num_frames_ + band * num_frames_per_band_],
+            num_frames_per_band_);
+        (*bands_view)[ch][band] = channels_view_[band][ch];
+        channels_[band * num_allocated_channels_ + ch] =
+            channels_view_[band][ch].data();
+        bands_[ch * num_bands_ + band] =
+            channels_[band * num_allocated_channels_ + ch];
+      }
+    }
+  }
+
+  // Returns a pointer array to the channels.
+  // If band is explicitly specificed, the channels for a specific band are
+  // returned and the usage becomes: channels(band)[channel][sample].
+  // Where:
+  // 0 <= band < `num_bands_`
+  // 0 <= channel < `num_allocated_channels_`
+  // 0 <= sample < `num_frames_per_band_`
+
+  // If band is not explicitly specified, the full-band channels (or lower band
+  // channels) are returned and the usage becomes: channels()[channel][sample].
+  // Where:
+  // 0 <= channel < `num_allocated_channels_`
+  // 0 <= sample < `num_frames_`
+  const T* const* channels(size_t band = 0) const {
+    RTC_DCHECK_LT(band, num_bands_);
+    return &channels_[band * num_allocated_channels_];
+  }
+  T* const* channels(size_t band = 0) {
+    const ChannelBuffer<T>* t = this;
+    return const_cast<T* const*>(t->channels(band));
+  }
+  rtc::ArrayView<const rtc::ArrayView<T>> channels_view(size_t band = 0) {
+    return channels_view_[band];
+  }
+  rtc::ArrayView<const rtc::ArrayView<T>> channels_view(size_t band = 0) const {
+    return channels_view_[band];
+  }
+
+  // Returns a pointer array to the bands for a specific channel.
+  // Usage:
+  // bands(channel)[band][sample].
+  // Where:
+  // 0 <= channel < `num_channels_`
+  // 0 <= band < `num_bands_`
+  // 0 <= sample < `num_frames_per_band_`
+  const T* const* bands(size_t channel) const {
+    RTC_DCHECK_LT(channel, num_channels_);
+    RTC_DCHECK_GE(channel, 0);
+    return &bands_[channel * num_bands_];
+  }
+  T* const* bands(size_t channel) {
+    const ChannelBuffer<T>* t = this;
+    return const_cast<T* const*>(t->bands(channel));
+  }
+
+  rtc::ArrayView<const rtc::ArrayView<T>> bands_view(size_t channel) {
+    return bands_view_[channel];
+  }
+  rtc::ArrayView<const rtc::ArrayView<T>> bands_view(size_t channel) const {
+    return bands_view_[channel];
+  }
+
+  // Sets the `slice` pointers to the `start_frame` position for each channel.
+  // Returns `slice` for convenience.
+  const T* const* Slice(T** slice, size_t start_frame) const {
+    RTC_DCHECK_LT(start_frame, num_frames_);
+    for (size_t i = 0; i < num_channels_; ++i)
+      slice[i] = &channels_[i][start_frame];
+    return slice;
+  }
+  T** Slice(T** slice, size_t start_frame) {
+    const ChannelBuffer<T>* t = this;
+    return const_cast<T**>(t->Slice(slice, start_frame));
+  }
+
+  size_t num_frames() const { return num_frames_; }
+  size_t num_frames_per_band() const { return num_frames_per_band_; }
+  size_t num_channels() const { return num_channels_; }
+  size_t num_bands() const { return num_bands_; }
+  size_t size() const { return num_frames_ * num_allocated_channels_; }
+
+  void set_num_channels(size_t num_channels) {
+    RTC_DCHECK_LE(num_channels, num_allocated_channels_);
+    num_channels_ = num_channels;
+  }
+
+  void SetDataForTesting(const T* data, size_t size) {
+    RTC_CHECK_EQ(size, this->size());
+    memcpy(data_.get(), data, size * sizeof(*data));
+  }
+
+ private:
+  std::unique_ptr<T[]> data_;
+  std::unique_ptr<T*[]> channels_;
+  std::unique_ptr<T*[]> bands_;
+  const size_t num_frames_;
+  const size_t num_frames_per_band_;
+  // Number of channels the internal buffer holds.
+  const size_t num_allocated_channels_;
+  // Number of channels the user sees.
+  size_t num_channels_;
+  const size_t num_bands_;
+  const std::vector<std::vector<rtc::ArrayView<T>>> bands_view_;
+  const std::vector<std::vector<rtc::ArrayView<T>>> channels_view_;
+};
+
+// One int16_t and one float ChannelBuffer that are kept in sync. The sync is
+// broken when someone requests write access to either ChannelBuffer, and
+// reestablished when someone requests the outdated ChannelBuffer. It is
+// therefore safe to use the return value of ibuf_const() and fbuf_const()
+// until the next call to ibuf() or fbuf(), and the return value of ibuf() and
+// fbuf() until the next call to any of the other functions.
+class IFChannelBuffer {
+ public:
+  IFChannelBuffer(size_t num_frames, size_t num_channels, size_t num_bands = 1);
+  ~IFChannelBuffer();
+
+  ChannelBuffer<int16_t>* ibuf();
+  ChannelBuffer<float>* fbuf();
+  const ChannelBuffer<int16_t>* ibuf_const() const;
+  const ChannelBuffer<float>* fbuf_const() const;
+
+  size_t num_frames() const { return ibuf_.num_frames(); }
+  size_t num_frames_per_band() const { return ibuf_.num_frames_per_band(); }
+  size_t num_channels() const {
+    return ivalid_ ? ibuf_.num_channels() : fbuf_.num_channels();
+  }
+  void set_num_channels(size_t num_channels) {
+    ibuf_.set_num_channels(num_channels);
+    fbuf_.set_num_channels(num_channels);
+  }
+  size_t num_bands() const { return ibuf_.num_bands(); }
+
+ private:
+  void RefreshF() const;
+  void RefreshI() const;
+
+  mutable bool ivalid_;
+  mutable ChannelBuffer<int16_t> ibuf_;
+  mutable bool fvalid_;
+  mutable ChannelBuffer<float> fbuf_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_CHANNEL_BUFFER_H_
diff --git a/third_party/libwebrtc/common_audio/channel_buffer_unittest.cc b/third_party/libwebrtc/common_audio/channel_buffer_unittest.cc
new file mode 100644
index 0000000000..a8b64891d6
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/channel_buffer_unittest.cc
@@ -0,0 +1,67 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/channel_buffer.h"
+
+#include "test/gtest.h"
+#include "test/testsupport/rtc_expect_death.h"
+
+namespace webrtc {
+
+namespace {
+
+const size_t kNumFrames = 480u;
+const size_t kStereo = 2u;
+const size_t kMono = 1u;
+
+void ExpectNumChannels(const IFChannelBuffer& ifchb, size_t num_channels) {
+  EXPECT_EQ(ifchb.ibuf_const()->num_channels(), num_channels);
+  EXPECT_EQ(ifchb.fbuf_const()->num_channels(), num_channels);
+  EXPECT_EQ(ifchb.num_channels(), num_channels);
+}
+
+}  // namespace
+
+TEST(ChannelBufferTest, SetNumChannelsSetsNumChannels) {
+  ChannelBuffer<float> chb(kNumFrames, kStereo);
+  EXPECT_EQ(chb.num_channels(), kStereo);
+  chb.set_num_channels(kMono);
+  EXPECT_EQ(chb.num_channels(), kMono);
+}
+
+TEST(IFChannelBufferTest, SetNumChannelsSetsChannelBuffersNumChannels) {
+  IFChannelBuffer ifchb(kNumFrames, kStereo);
+  ExpectNumChannels(ifchb, kStereo);
+  ifchb.set_num_channels(kMono);
+  ExpectNumChannels(ifchb, kMono);
+}
+
+TEST(IFChannelBufferTest, SettingNumChannelsOfOneChannelBufferSetsTheOther) {
+  IFChannelBuffer ifchb(kNumFrames, kStereo);
+  ExpectNumChannels(ifchb, kStereo);
+  ifchb.ibuf()->set_num_channels(kMono);
+  ExpectNumChannels(ifchb, kMono);
+  ifchb.fbuf()->set_num_channels(kStereo);
+  ExpectNumChannels(ifchb, kStereo);
+}
+
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+TEST(ChannelBufferDeathTest, SetNumChannelsDeathTest) {
+  ChannelBuffer<float> chb(kNumFrames, kMono);
+  RTC_EXPECT_DEATH(chb.set_num_channels(kStereo), "num_channels");
+}
+
+TEST(IFChannelBufferDeathTest, SetNumChannelsDeathTest) {
+  IFChannelBuffer ifchb(kNumFrames, kMono);
+  RTC_EXPECT_DEATH(ifchb.ibuf()->set_num_channels(kStereo), "num_channels");
+}
+#endif
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/common_audio_avx2_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_avx2_gn/moz.build
new file mode 100644
index 0000000000..390c83ec43
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_avx2_gn/moz.build
@@ -0,0 +1,190 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+CXXFLAGS += [
+    "-mavx2",
+    "-mfma"
+]
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_AVX2"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/fir_filter_avx2.cc",
+    "/third_party/libwebrtc/common_audio/resampler/sinc_resampler_avx2.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+Library("common_audio_avx2_gn")
diff --git a/third_party/libwebrtc/common_audio/common_audio_c_arm_asm_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_c_arm_asm_gn/moz.build
new file mode 100644
index 0000000000..ec4329a9cc
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_c_arm_asm_gn/moz.build
@@ -0,0 +1,210 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+    SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_arm.S",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_armv7.S"
+    ]
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("common_audio_c_arm_asm_gn")
diff --git a/third_party/libwebrtc/common_audio/common_audio_c_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_c_gn/moz.build
new file mode 100644
index 0000000000..1c3cdc1624
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_c_gn/moz.build
@@ -0,0 +1,371 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+SOURCES += [
+    "/third_party/libwebrtc/common_audio/vad/vad_core.c",
+    "/third_party/libwebrtc/common_audio/vad/webrtc_vad.c"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/ring_buffer.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/auto_corr_to_refl_coef.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/auto_correlation.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/copy_set_operations.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/cross_correlation.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/division_operations.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/downsample_fast.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/energy.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/filter_ar.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/filter_ma_fast_q12.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/get_hanning_window.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/get_scaling_square.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/ilbc_specific_functions.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/levinson_durbin.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/lpc_to_refl_coef.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/min_max_operations.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/randomization_functions.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/real_fft.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/refl_coef_to_lpc.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/resample.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/resample_48khz.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/resample_by_2.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_internal.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/resample_fractional.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/spl_init.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/spl_inl.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/spl_sqrt.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/splitting_filter.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/sqrt_of_one_minus_x_squared.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/vector_scaling_operations.c",
+    "/third_party/libwebrtc/common_audio/vad/vad_filterbank.c",
+    "/third_party/libwebrtc/common_audio/vad/vad_gmm.c",
+    "/third_party/libwebrtc/common_audio/vad/vad_sp.c"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+    SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_mips.c"
+    ]
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_mips.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft_mips.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_mips.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_mips.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_mips.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_mips.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "ppc64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "riscv64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c",
+        "/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c"
+    ]
+
+Library("common_audio_c_gn")
diff --git a/third_party/libwebrtc/common_audio/common_audio_cc_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_cc_gn/moz.build
new file mode 100644
index 0000000000..31757c2b89
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_cc_gn/moz.build
@@ -0,0 +1,236 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("common_audio_cc_gn")
diff --git a/third_party/libwebrtc/common_audio/common_audio_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_gn/moz.build
new file mode 100644
index 0000000000..b6c5dc57c8
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_gn/moz.build
@@ -0,0 +1,249 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/audio_converter.cc",
+    "/third_party/libwebrtc/common_audio/audio_util.cc",
+    "/third_party/libwebrtc/common_audio/channel_buffer.cc",
+    "/third_party/libwebrtc/common_audio/real_fourier.cc",
+    "/third_party/libwebrtc/common_audio/real_fourier_ooura.cc",
+    "/third_party/libwebrtc/common_audio/resampler/push_resampler.cc",
+    "/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler.cc",
+    "/third_party/libwebrtc/common_audio/resampler/resampler.cc",
+    "/third_party/libwebrtc/common_audio/resampler/sinc_resampler.cc",
+    "/third_party/libwebrtc/common_audio/smoothing_filter.cc",
+    "/third_party/libwebrtc/common_audio/vad/vad.cc",
+    "/third_party/libwebrtc/common_audio/wav_file.cc",
+    "/third_party/libwebrtc/common_audio/wav_header.cc",
+    "/third_party/libwebrtc/common_audio/window_generator.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("common_audio_gn")
diff --git a/third_party/libwebrtc/common_audio/common_audio_neon_c_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_neon_c_gn/moz.build
new file mode 100644
index 0000000000..f2ef55667b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_neon_c_gn/moz.build
@@ -0,0 +1,197 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_HAS_NEON"] = True
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_neon.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_neon.c",
+    "/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_neon.c"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+
+Library("common_audio_neon_c_gn")
diff --git a/third_party/libwebrtc/common_audio/common_audio_neon_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_neon_gn/moz.build
new file mode 100644
index 0000000000..2b5a1cf4cc
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_neon_gn/moz.build
@@ -0,0 +1,196 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_HAS_NEON"] = True
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/fir_filter_neon.cc",
+    "/third_party/libwebrtc/common_audio/resampler/sinc_resampler_neon.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+
+Library("common_audio_neon_gn")
diff --git a/third_party/libwebrtc/common_audio/common_audio_sse2_gn/moz.build b/third_party/libwebrtc/common_audio/common_audio_sse2_gn/moz.build
new file mode 100644
index 0000000000..298c08b418
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/common_audio_sse2_gn/moz.build
@@ -0,0 +1,207 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_AVX2"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/fir_filter_sse.cc",
+    "/third_party/libwebrtc/common_audio/resampler/sinc_resampler_sse.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2",
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2",
+        "-msse2"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+Library("common_audio_sse2_gn")
diff --git a/third_party/libwebrtc/common_audio/fir_filter.h b/third_party/libwebrtc/common_audio/fir_filter.h
new file mode 100644
index 0000000000..e0b18ca44c
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter.h
@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_FIR_FILTER_H_
+#define COMMON_AUDIO_FIR_FILTER_H_
+
+#include <string.h>
+
+namespace webrtc {
+
+// Finite Impulse Response filter using floating-point arithmetic.
+class FIRFilter {
+ public:
+  virtual ~FIRFilter() {}
+
+  // Filters the `in` data supplied.
+  // `out` must be previously allocated and it must be at least of `length`.
+  virtual void Filter(const float* in, size_t length, float* out) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_H_
diff --git a/third_party/libwebrtc/common_audio/fir_filter_avx2.cc b/third_party/libwebrtc/common_audio/fir_filter_avx2.cc
new file mode 100644
index 0000000000..0031392f8a
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_avx2.cc
@@ -0,0 +1,90 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/fir_filter_avx2.h"
+
+#include <immintrin.h>
+#include <stdint.h>
+#include <string.h>
+#include <xmmintrin.h>
+
+#include "common_audio/intrin.h"
+
+#include "rtc_base/checks.h"
+#include "rtc_base/memory/aligned_malloc.h"
+
+namespace webrtc {
+
+FIRFilterAVX2::FIRFilterAVX2(const float* unaligned_coefficients,
+                             size_t unaligned_coefficients_length,
+                             size_t max_input_length)
+    :  // Closest higher multiple of eight.
+      coefficients_length_((unaligned_coefficients_length + 7) & ~0x07),
+      state_length_(coefficients_length_ - 1),
+      coefficients_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * coefficients_length_, 32))),
+      state_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * (max_input_length + state_length_),
+                        32))) {
+  // Add zeros at the end of the coefficients.
+  RTC_DCHECK_GE(coefficients_length_, unaligned_coefficients_length);
+  size_t padding = coefficients_length_ - unaligned_coefficients_length;
+  memset(coefficients_.get(), 0, padding * sizeof(coefficients_[0]));
+  // The coefficients are reversed to compensate for the order in which the
+  // input samples are acquired (most recent last).
+  for (size_t i = 0; i < unaligned_coefficients_length; ++i) {
+    coefficients_[i + padding] =
+        unaligned_coefficients[unaligned_coefficients_length - i - 1];
+  }
+  memset(state_.get(), 0,
+         (max_input_length + state_length_) * sizeof(state_[0]));
+}
+
+FIRFilterAVX2::~FIRFilterAVX2() = default;
+
+void FIRFilterAVX2::Filter(const float* in, size_t length, float* out) {
+  RTC_DCHECK_GT(length, 0);
+
+  memcpy(&state_[state_length_], in, length * sizeof(*in));
+
+  // Convolves the input signal `in` with the filter kernel `coefficients_`
+  // taking into account the previous state.
+  for (size_t i = 0; i < length; ++i) {
+    float* in_ptr = &state_[i];
+    float* coef_ptr = coefficients_.get();
+
+    __m256 m_sum = _mm256_setzero_ps();
+    __m256 m_in;
+
+    // Depending on if the pointer is aligned with 32 bytes or not it is loaded
+    // differently.
+    if (reinterpret_cast<uintptr_t>(in_ptr) & 0x1F) {
+      for (size_t j = 0; j < coefficients_length_; j += 8) {
+        m_in = _mm256_loadu_ps(in_ptr + j);
+        m_sum = _mm256_fmadd_ps(m_in, _mm256_load_ps(coef_ptr + j), m_sum);
+      }
+    } else {
+      for (size_t j = 0; j < coefficients_length_; j += 8) {
+        m_in = _mm256_load_ps(in_ptr + j);
+        m_sum = _mm256_fmadd_ps(m_in, _mm256_load_ps(coef_ptr + j), m_sum);
+      }
+    }
+    __m128 m128_sum = _mm_add_ps(_mm256_extractf128_ps(m_sum, 0),
+                                 _mm256_extractf128_ps(m_sum, 1));
+    m128_sum = _mm_add_ps(_mm_movehl_ps(m128_sum, m128_sum), m128_sum);
+    _mm_store_ss(out + i,
+                 _mm_add_ss(m128_sum, _mm_shuffle_ps(m128_sum, m128_sum, 1)));
+  }
+
+  // Update current state.
+  memmove(state_.get(), &state_[length], state_length_ * sizeof(state_[0]));
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/fir_filter_avx2.h b/third_party/libwebrtc/common_audio/fir_filter_avx2.h
new file mode 100644
index 0000000000..893b60bf6e
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_avx2.h
@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_FIR_FILTER_AVX2_H_
+#define COMMON_AUDIO_FIR_FILTER_AVX2_H_
+
+#include <stddef.h>
+
+#include <memory>
+
+#include "common_audio/fir_filter.h"
+#include "rtc_base/memory/aligned_malloc.h"
+
+namespace webrtc {
+
+class FIRFilterAVX2 : public FIRFilter {
+ public:
+  FIRFilterAVX2(const float* coefficients,
+                size_t coefficients_length,
+                size_t max_input_length);
+  ~FIRFilterAVX2() override;
+
+  void Filter(const float* in, size_t length, float* out) override;
+
+ private:
+  const size_t coefficients_length_;
+  const size_t state_length_;
+  std::unique_ptr<float[], AlignedFreeDeleter> coefficients_;
+  std::unique_ptr<float[], AlignedFreeDeleter> state_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_AVX2_H_
diff --git a/third_party/libwebrtc/common_audio/fir_filter_c.cc b/third_party/libwebrtc/common_audio/fir_filter_c.cc
new file mode 100644
index 0000000000..dc1c8e0d28
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_c.cc
@@ -0,0 +1,61 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/fir_filter_c.h"
+
+#include <string.h>
+
+#include <memory>
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+FIRFilterC::~FIRFilterC() {}
+
+FIRFilterC::FIRFilterC(const float* coefficients, size_t coefficients_length)
+    : coefficients_length_(coefficients_length),
+      state_length_(coefficients_length - 1),
+      coefficients_(new float[coefficients_length_]),
+      state_(new float[state_length_]) {
+  for (size_t i = 0; i < coefficients_length_; ++i) {
+    coefficients_[i] = coefficients[coefficients_length_ - i - 1];
+  }
+  memset(state_.get(), 0, state_length_ * sizeof(state_[0]));
+}
+
+void FIRFilterC::Filter(const float* in, size_t length, float* out) {
+  RTC_DCHECK_GT(length, 0);
+
+  // Convolves the input signal `in` with the filter kernel `coefficients_`
+  // taking into account the previous state.
+  for (size_t i = 0; i < length; ++i) {
+    out[i] = 0.f;
+    size_t j;
+    for (j = 0; state_length_ > i && j < state_length_ - i; ++j) {
+      out[i] += state_[i + j] * coefficients_[j];
+    }
+    for (; j < coefficients_length_; ++j) {
+      out[i] += in[j + i - state_length_] * coefficients_[j];
+    }
+  }
+
+  // Update current state.
+  if (length >= state_length_) {
+    memcpy(state_.get(), &in[length - state_length_],
+           state_length_ * sizeof(*in));
+  } else {
+    memmove(state_.get(), &state_[length],
+            (state_length_ - length) * sizeof(state_[0]));
+    memcpy(&state_[state_length_ - length], in, length * sizeof(*in));
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/fir_filter_c.h b/third_party/libwebrtc/common_audio/fir_filter_c.h
new file mode 100644
index 0000000000..b2ae4c3217
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_c.h
@@ -0,0 +1,38 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_FIR_FILTER_C_H_
+#define COMMON_AUDIO_FIR_FILTER_C_H_
+
+#include <string.h>
+
+#include <memory>
+
+#include "common_audio/fir_filter.h"
+
+namespace webrtc {
+
+class FIRFilterC : public FIRFilter {
+ public:
+  FIRFilterC(const float* coefficients, size_t coefficients_length);
+  ~FIRFilterC() override;
+
+  void Filter(const float* in, size_t length, float* out) override;
+
+ private:
+  size_t coefficients_length_;
+  size_t state_length_;
+  std::unique_ptr<float[]> coefficients_;
+  std::unique_ptr<float[]> state_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_C_H_
diff --git a/third_party/libwebrtc/common_audio/fir_filter_factory.cc b/third_party/libwebrtc/common_audio/fir_filter_factory.cc
new file mode 100644
index 0000000000..2ecef6501f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_factory.cc
@@ -0,0 +1,58 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/fir_filter_factory.h"
+
+#include "common_audio/fir_filter_c.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/system/arch.h"
+
+#if defined(WEBRTC_HAS_NEON)
+#include "common_audio/fir_filter_neon.h"
+#elif defined(WEBRTC_ARCH_X86_FAMILY)
+#include "common_audio/fir_filter_avx2.h"
+#include "common_audio/fir_filter_sse.h"
+#include "system_wrappers/include/cpu_features_wrapper.h"  // kSSE2, WebRtc_G...
+#endif
+
+namespace webrtc {
+
+FIRFilter* CreateFirFilter(const float* coefficients,
+                           size_t coefficients_length,
+                           size_t max_input_length) {
+  if (!coefficients || coefficients_length <= 0 || max_input_length <= 0) {
+    RTC_DCHECK_NOTREACHED();
+    return nullptr;
+  }
+
+  FIRFilter* filter = nullptr;
+// If we know the minimum architecture at compile time, avoid CPU detection.
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+  // x86 CPU detection required.
+  if (GetCPUInfo(kAVX2)) {
+    filter =
+        new FIRFilterAVX2(coefficients, coefficients_length, max_input_length);
+  } else if (GetCPUInfo(kSSE2)) {
+    filter =
+        new FIRFilterSSE2(coefficients, coefficients_length, max_input_length);
+  } else {
+    filter = new FIRFilterC(coefficients, coefficients_length);
+  }
+#elif defined(WEBRTC_HAS_NEON)
+  filter =
+      new FIRFilterNEON(coefficients, coefficients_length, max_input_length);
+#else
+  filter = new FIRFilterC(coefficients, coefficients_length);
+#endif
+
+  return filter;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/fir_filter_factory.h b/third_party/libwebrtc/common_audio/fir_filter_factory.h
new file mode 100644
index 0000000000..e76c3aef7d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_factory.h
@@ -0,0 +1,32 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_FIR_FILTER_FACTORY_H_
+#define COMMON_AUDIO_FIR_FILTER_FACTORY_H_
+
+#include <string.h>
+
+namespace webrtc {
+
+class FIRFilter;
+
+// Creates a filter with the given coefficients. All initial state values will
+// be zeros.
+// The length of the chunks fed to the filter should never be greater than
+// `max_input_length`. This is needed because, when vectorizing it is
+// necessary to concatenate the input after the state, and resizing this array
+// dynamically is expensive.
+FIRFilter* CreateFirFilter(const float* coefficients,
+                           size_t coefficients_length,
+                           size_t max_input_length);
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_FACTORY_H_
diff --git a/third_party/libwebrtc/common_audio/fir_filter_factory_gn/moz.build b/third_party/libwebrtc/common_audio/fir_filter_factory_gn/moz.build
new file mode 100644
index 0000000000..699fdd0267
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_factory_gn/moz.build
@@ -0,0 +1,237 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/fir_filter_c.cc",
+    "/third_party/libwebrtc/common_audio/fir_filter_factory.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("fir_filter_factory_gn")
diff --git a/third_party/libwebrtc/common_audio/fir_filter_gn/moz.build b/third_party/libwebrtc/common_audio/fir_filter_gn/moz.build
new file mode 100644
index 0000000000..b0236d1067
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_gn/moz.build
@@ -0,0 +1,205 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("fir_filter_gn")
diff --git a/third_party/libwebrtc/common_audio/fir_filter_neon.cc b/third_party/libwebrtc/common_audio/fir_filter_neon.cc
new file mode 100644
index 0000000000..346cb69f5f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_neon.cc
@@ -0,0 +1,73 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/fir_filter_neon.h"
+
+#include <arm_neon.h>
+#include <string.h>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/memory/aligned_malloc.h"
+
+namespace webrtc {
+
+FIRFilterNEON::~FIRFilterNEON() {}
+
+FIRFilterNEON::FIRFilterNEON(const float* coefficients,
+                             size_t coefficients_length,
+                             size_t max_input_length)
+    :  // Closest higher multiple of four.
+      coefficients_length_((coefficients_length + 3) & ~0x03),
+      state_length_(coefficients_length_ - 1),
+      coefficients_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * coefficients_length_, 16))),
+      state_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * (max_input_length + state_length_),
+                        16))) {
+  // Add zeros at the end of the coefficients.
+  size_t padding = coefficients_length_ - coefficients_length;
+  memset(coefficients_.get(), 0.f, padding * sizeof(coefficients_[0]));
+  // The coefficients are reversed to compensate for the order in which the
+  // input samples are acquired (most recent last).
+  for (size_t i = 0; i < coefficients_length; ++i) {
+    coefficients_[i + padding] = coefficients[coefficients_length - i - 1];
+  }
+  memset(state_.get(), 0.f,
+         (max_input_length + state_length_) * sizeof(state_[0]));
+}
+
+void FIRFilterNEON::Filter(const float* in, size_t length, float* out) {
+  RTC_DCHECK_GT(length, 0);
+
+  memcpy(&state_[state_length_], in, length * sizeof(*in));
+
+  // Convolves the input signal `in` with the filter kernel `coefficients_`
+  // taking into account the previous state.
+  for (size_t i = 0; i < length; ++i) {
+    float* in_ptr = &state_[i];
+    float* coef_ptr = coefficients_.get();
+
+    float32x4_t m_sum = vmovq_n_f32(0);
+    float32x4_t m_in;
+
+    for (size_t j = 0; j < coefficients_length_; j += 4) {
+      m_in = vld1q_f32(in_ptr + j);
+      m_sum = vmlaq_f32(m_sum, m_in, vld1q_f32(coef_ptr + j));
+    }
+
+    float32x2_t m_half = vadd_f32(vget_high_f32(m_sum), vget_low_f32(m_sum));
+    out[i] = vget_lane_f32(vpadd_f32(m_half, m_half), 0);
+  }
+
+  // Update current state.
+  memmove(state_.get(), &state_[length], state_length_ * sizeof(state_[0]));
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/fir_filter_neon.h b/third_party/libwebrtc/common_audio/fir_filter_neon.h
new file mode 100644
index 0000000000..1ffefd80dc
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_neon.h
@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_FIR_FILTER_NEON_H_
+#define COMMON_AUDIO_FIR_FILTER_NEON_H_
+
+#include <memory>
+
+#include "common_audio/fir_filter.h"
+#include "rtc_base/memory/aligned_malloc.h"
+
+namespace webrtc {
+
+class FIRFilterNEON : public FIRFilter {
+ public:
+  FIRFilterNEON(const float* coefficients,
+                size_t coefficients_length,
+                size_t max_input_length);
+  ~FIRFilterNEON() override;
+
+  void Filter(const float* in, size_t length, float* out) override;
+
+ private:
+  size_t coefficients_length_;
+  size_t state_length_;
+  std::unique_ptr<float[], AlignedFreeDeleter> coefficients_;
+  std::unique_ptr<float[], AlignedFreeDeleter> state_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_NEON_H_
diff --git a/third_party/libwebrtc/common_audio/fir_filter_sse.cc b/third_party/libwebrtc/common_audio/fir_filter_sse.cc
new file mode 100644
index 0000000000..0e45994a1d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_sse.cc
@@ -0,0 +1,82 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/fir_filter_sse.h"
+
+#include <stdint.h>
+#include <string.h>
+#include <xmmintrin.h>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/memory/aligned_malloc.h"
+
+namespace webrtc {
+
+FIRFilterSSE2::~FIRFilterSSE2() {}
+
+FIRFilterSSE2::FIRFilterSSE2(const float* coefficients,
+                             size_t coefficients_length,
+                             size_t max_input_length)
+    :  // Closest higher multiple of four.
+      coefficients_length_((coefficients_length + 3) & ~0x03),
+      state_length_(coefficients_length_ - 1),
+      coefficients_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * coefficients_length_, 16))),
+      state_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * (max_input_length + state_length_),
+                        16))) {
+  // Add zeros at the end of the coefficients.
+  size_t padding = coefficients_length_ - coefficients_length;
+  memset(coefficients_.get(), 0, padding * sizeof(coefficients_[0]));
+  // The coefficients are reversed to compensate for the order in which the
+  // input samples are acquired (most recent last).
+  for (size_t i = 0; i < coefficients_length; ++i) {
+    coefficients_[i + padding] = coefficients[coefficients_length - i - 1];
+  }
+  memset(state_.get(), 0,
+         (max_input_length + state_length_) * sizeof(state_[0]));
+}
+
+void FIRFilterSSE2::Filter(const float* in, size_t length, float* out) {
+  RTC_DCHECK_GT(length, 0);
+
+  memcpy(&state_[state_length_], in, length * sizeof(*in));
+
+  // Convolves the input signal `in` with the filter kernel `coefficients_`
+  // taking into account the previous state.
+  for (size_t i = 0; i < length; ++i) {
+    float* in_ptr = &state_[i];
+    float* coef_ptr = coefficients_.get();
+
+    __m128 m_sum = _mm_setzero_ps();
+    __m128 m_in;
+
+    // Depending on if the pointer is aligned with 16 bytes or not it is loaded
+    // differently.
+    if (reinterpret_cast<uintptr_t>(in_ptr) & 0x0F) {
+      for (size_t j = 0; j < coefficients_length_; j += 4) {
+        m_in = _mm_loadu_ps(in_ptr + j);
+        m_sum = _mm_add_ps(m_sum, _mm_mul_ps(m_in, _mm_load_ps(coef_ptr + j)));
+      }
+    } else {
+      for (size_t j = 0; j < coefficients_length_; j += 4) {
+        m_in = _mm_load_ps(in_ptr + j);
+        m_sum = _mm_add_ps(m_sum, _mm_mul_ps(m_in, _mm_load_ps(coef_ptr + j)));
+      }
+    }
+    m_sum = _mm_add_ps(_mm_movehl_ps(m_sum, m_sum), m_sum);
+    _mm_store_ss(out + i, _mm_add_ss(m_sum, _mm_shuffle_ps(m_sum, m_sum, 1)));
+  }
+
+  // Update current state.
+  memmove(state_.get(), &state_[length], state_length_ * sizeof(state_[0]));
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/fir_filter_sse.h b/third_party/libwebrtc/common_audio/fir_filter_sse.h
new file mode 100644
index 0000000000..32f4945acc
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_sse.h
@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_FIR_FILTER_SSE_H_
+#define COMMON_AUDIO_FIR_FILTER_SSE_H_
+
+#include <stddef.h>
+
+#include <memory>
+
+#include "common_audio/fir_filter.h"
+#include "rtc_base/memory/aligned_malloc.h"
+
+namespace webrtc {
+
+class FIRFilterSSE2 : public FIRFilter {
+ public:
+  FIRFilterSSE2(const float* coefficients,
+                size_t coefficients_length,
+                size_t max_input_length);
+  ~FIRFilterSSE2() override;
+
+  void Filter(const float* in, size_t length, float* out) override;
+
+ private:
+  size_t coefficients_length_;
+  size_t state_length_;
+  std::unique_ptr<float[], AlignedFreeDeleter> coefficients_;
+  std::unique_ptr<float[], AlignedFreeDeleter> state_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_FIR_FILTER_SSE_H_
diff --git a/third_party/libwebrtc/common_audio/fir_filter_unittest.cc b/third_party/libwebrtc/common_audio/fir_filter_unittest.cc
new file mode 100644
index 0000000000..5c5880b5eb
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/fir_filter_unittest.cc
@@ -0,0 +1,208 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/fir_filter.h"
+
+#include <string.h>
+
+#include <memory>
+
+#include "common_audio/fir_filter_factory.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace {
+
+static const float kCoefficients[] = {0.2f, 0.3f, 0.5f, 0.7f, 0.11f};
+static const size_t kCoefficientsLength =
+    sizeof(kCoefficients) / sizeof(kCoefficients[0]);
+
+static const float kInput[] = {1.f, 2.f, 3.f, 4.f, 5.f,
+                               6.f, 7.f, 8.f, 9.f, 10.f};
+static const size_t kInputLength = sizeof(kInput) / sizeof(kInput[0]);
+
+void VerifyOutput(const float* expected_output,
+                  const float* output,
+                  size_t length) {
+  EXPECT_EQ(
+      0, memcmp(expected_output, output, length * sizeof(expected_output[0])));
+}
+
+}  // namespace
+
+TEST(FIRFilterTest, FilterAsIdentity) {
+  const float kCoefficients[] = {1.f, 0.f, 0.f, 0.f, 0.f};
+  float output[kInputLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, kInputLength));
+  filter->Filter(kInput, kInputLength, output);
+
+  VerifyOutput(kInput, output, kInputLength);
+}
+
+TEST(FIRFilterTest, FilterUsedAsScalarMultiplication) {
+  const float kCoefficients[] = {5.f, 0.f, 0.f, 0.f, 0.f};
+  float output[kInputLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, kInputLength));
+  filter->Filter(kInput, kInputLength, output);
+
+  EXPECT_FLOAT_EQ(5.f, output[0]);
+  EXPECT_FLOAT_EQ(20.f, output[3]);
+  EXPECT_FLOAT_EQ(25.f, output[4]);
+  EXPECT_FLOAT_EQ(50.f, output[kInputLength - 1]);
+}
+
+TEST(FIRFilterTest, FilterUsedAsInputShifting) {
+  const float kCoefficients[] = {0.f, 0.f, 0.f, 0.f, 1.f};
+  float output[kInputLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, kInputLength));
+  filter->Filter(kInput, kInputLength, output);
+
+  EXPECT_FLOAT_EQ(0.f, output[0]);
+  EXPECT_FLOAT_EQ(0.f, output[3]);
+  EXPECT_FLOAT_EQ(1.f, output[4]);
+  EXPECT_FLOAT_EQ(2.f, output[5]);
+  EXPECT_FLOAT_EQ(6.f, output[kInputLength - 1]);
+}
+
+TEST(FIRFilterTest, FilterUsedAsArbitraryWeighting) {
+  float output[kInputLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, kInputLength));
+  filter->Filter(kInput, kInputLength, output);
+
+  EXPECT_FLOAT_EQ(0.2f, output[0]);
+  EXPECT_FLOAT_EQ(3.4f, output[3]);
+  EXPECT_FLOAT_EQ(5.21f, output[4]);
+  EXPECT_FLOAT_EQ(7.02f, output[5]);
+  EXPECT_FLOAT_EQ(14.26f, output[kInputLength - 1]);
+}
+
+TEST(FIRFilterTest, FilterInLengthLesserOrEqualToCoefficientsLength) {
+  float output[kInputLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, 2));
+  filter->Filter(kInput, 2, output);
+
+  EXPECT_FLOAT_EQ(0.2f, output[0]);
+  EXPECT_FLOAT_EQ(0.7f, output[1]);
+  filter.reset(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, kCoefficientsLength));
+  filter->Filter(kInput, kCoefficientsLength, output);
+
+  EXPECT_FLOAT_EQ(0.2f, output[0]);
+  EXPECT_FLOAT_EQ(3.4f, output[3]);
+  EXPECT_FLOAT_EQ(5.21f, output[4]);
+}
+
+TEST(FIRFilterTest, MultipleFilterCalls) {
+  float output[kInputLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, 3));
+  filter->Filter(kInput, 2, output);
+  EXPECT_FLOAT_EQ(0.2f, output[0]);
+  EXPECT_FLOAT_EQ(0.7f, output[1]);
+
+  filter->Filter(kInput, 2, output);
+  EXPECT_FLOAT_EQ(1.3f, output[0]);
+  EXPECT_FLOAT_EQ(2.4f, output[1]);
+
+  filter->Filter(kInput, 2, output);
+  EXPECT_FLOAT_EQ(2.81f, output[0]);
+  EXPECT_FLOAT_EQ(2.62f, output[1]);
+
+  filter->Filter(kInput, 2, output);
+  EXPECT_FLOAT_EQ(2.81f, output[0]);
+  EXPECT_FLOAT_EQ(2.62f, output[1]);
+
+  filter->Filter(&kInput[3], 3, output);
+  EXPECT_FLOAT_EQ(3.41f, output[0]);
+  EXPECT_FLOAT_EQ(4.12f, output[1]);
+  EXPECT_FLOAT_EQ(6.21f, output[2]);
+
+  filter->Filter(&kInput[3], 3, output);
+  EXPECT_FLOAT_EQ(8.12f, output[0]);
+  EXPECT_FLOAT_EQ(9.14f, output[1]);
+  EXPECT_FLOAT_EQ(9.45f, output[2]);
+}
+
+TEST(FIRFilterTest, VerifySampleBasedVsBlockBasedFiltering) {
+  float output_block_based[kInputLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, kInputLength));
+  filter->Filter(kInput, kInputLength, output_block_based);
+
+  float output_sample_based[kInputLength];
+  filter.reset(CreateFirFilter(kCoefficients, kCoefficientsLength, 1));
+  for (size_t i = 0; i < kInputLength; ++i) {
+    filter->Filter(&kInput[i], 1, &output_sample_based[i]);
+  }
+
+  EXPECT_EQ(0, memcmp(output_sample_based, output_block_based, kInputLength));
+}
+
+TEST(FIRFilterTest, SimplestHighPassFilter) {
+  const float kCoefficients[] = {1.f, -1.f};
+  const size_t kCoefficientsLength =
+      sizeof(kCoefficients) / sizeof(kCoefficients[0]);
+
+  float kConstantInput[] = {1.f, 1.f, 1.f, 1.f, 1.f, 1.f, 1.f, 1.f};
+  const size_t kConstantInputLength =
+      sizeof(kConstantInput) / sizeof(kConstantInput[0]);
+
+  float output[kConstantInputLength];
+  std::unique_ptr<FIRFilter> filter(CreateFirFilter(
+      kCoefficients, kCoefficientsLength, kConstantInputLength));
+  filter->Filter(kConstantInput, kConstantInputLength, output);
+  EXPECT_FLOAT_EQ(1.f, output[0]);
+  for (size_t i = kCoefficientsLength - 1; i < kConstantInputLength; ++i) {
+    EXPECT_FLOAT_EQ(0.f, output[i]);
+  }
+}
+
+TEST(FIRFilterTest, SimplestLowPassFilter) {
+  const float kCoefficients[] = {1.f, 1.f};
+  const size_t kCoefficientsLength =
+      sizeof(kCoefficients) / sizeof(kCoefficients[0]);
+
+  float kHighFrequencyInput[] = {-1.f, 1.f, -1.f, 1.f, -1.f, 1.f, -1.f, 1.f};
+  const size_t kHighFrequencyInputLength =
+      sizeof(kHighFrequencyInput) / sizeof(kHighFrequencyInput[0]);
+
+  float output[kHighFrequencyInputLength];
+  std::unique_ptr<FIRFilter> filter(CreateFirFilter(
+      kCoefficients, kCoefficientsLength, kHighFrequencyInputLength));
+  filter->Filter(kHighFrequencyInput, kHighFrequencyInputLength, output);
+  EXPECT_FLOAT_EQ(-1.f, output[0]);
+  for (size_t i = kCoefficientsLength - 1; i < kHighFrequencyInputLength; ++i) {
+    EXPECT_FLOAT_EQ(0.f, output[i]);
+  }
+}
+
+TEST(FIRFilterTest, SameOutputWhenSwapedCoefficientsAndInput) {
+  float output[kCoefficientsLength];
+  float output_swaped[kCoefficientsLength];
+  std::unique_ptr<FIRFilter> filter(
+      CreateFirFilter(kCoefficients, kCoefficientsLength, kCoefficientsLength));
+  // Use kCoefficientsLength for in_length to get same-length outputs.
+  filter->Filter(kInput, kCoefficientsLength, output);
+
+  filter.reset(
+      CreateFirFilter(kInput, kCoefficientsLength, kCoefficientsLength));
+  filter->Filter(kCoefficients, kCoefficientsLength, output_swaped);
+
+  for (size_t i = 0; i < kCoefficientsLength; ++i) {
+    EXPECT_FLOAT_EQ(output[i], output_swaped[i]);
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/include/audio_util.h b/third_party/libwebrtc/common_audio/include/audio_util.h
new file mode 100644
index 0000000000..4ce46800f1
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/include/audio_util.h
@@ -0,0 +1,214 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_INCLUDE_AUDIO_UTIL_H_
+#define COMMON_AUDIO_INCLUDE_AUDIO_UTIL_H_
+
+#include <stdint.h>
+
+#include <algorithm>
+#include <cmath>
+#include <cstring>
+#include <limits>
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+typedef std::numeric_limits<int16_t> limits_int16;
+
+// The conversion functions use the following naming convention:
+// S16:      int16_t [-32768, 32767]
+// Float:    float   [-1.0, 1.0]
+// FloatS16: float   [-32768.0, 32768.0]
+// Dbfs: float [-20.0*log(10, 32768), 0] = [-90.3, 0]
+// The ratio conversion functions use this naming convention:
+// Ratio: float (0, +inf)
+// Db: float (-inf, +inf)
+static inline float S16ToFloat(int16_t v) {
+  constexpr float kScaling = 1.f / 32768.f;
+  return v * kScaling;
+}
+
+static inline int16_t FloatS16ToS16(float v) {
+  v = std::min(v, 32767.f);
+  v = std::max(v, -32768.f);
+  return static_cast<int16_t>(v + std::copysign(0.5f, v));
+}
+
+static inline int16_t FloatToS16(float v) {
+  v *= 32768.f;
+  v = std::min(v, 32767.f);
+  v = std::max(v, -32768.f);
+  return static_cast<int16_t>(v + std::copysign(0.5f, v));
+}
+
+static inline float FloatToFloatS16(float v) {
+  v = std::min(v, 1.f);
+  v = std::max(v, -1.f);
+  return v * 32768.f;
+}
+
+static inline float FloatS16ToFloat(float v) {
+  v = std::min(v, 32768.f);
+  v = std::max(v, -32768.f);
+  constexpr float kScaling = 1.f / 32768.f;
+  return v * kScaling;
+}
+
+void FloatToS16(const float* src, size_t size, int16_t* dest);
+void S16ToFloat(const int16_t* src, size_t size, float* dest);
+void S16ToFloatS16(const int16_t* src, size_t size, float* dest);
+void FloatS16ToS16(const float* src, size_t size, int16_t* dest);
+void FloatToFloatS16(const float* src, size_t size, float* dest);
+void FloatS16ToFloat(const float* src, size_t size, float* dest);
+
+inline float DbToRatio(float v) {
+  return std::pow(10.0f, v / 20.0f);
+}
+
+inline float DbfsToFloatS16(float v) {
+  static constexpr float kMaximumAbsFloatS16 = -limits_int16::min();
+  return DbToRatio(v) * kMaximumAbsFloatS16;
+}
+
+inline float FloatS16ToDbfs(float v) {
+  RTC_DCHECK_GE(v, 0);
+
+  // kMinDbfs is equal to -20.0 * log10(-limits_int16::min())
+  static constexpr float kMinDbfs = -90.30899869919436f;
+  if (v <= 1.0f) {
+    return kMinDbfs;
+  }
+  // Equal to 20 * log10(v / (-limits_int16::min()))
+  return 20.0f * std::log10(v) + kMinDbfs;
+}
+
+// Copy audio from `src` channels to `dest` channels unless `src` and `dest`
+// point to the same address. `src` and `dest` must have the same number of
+// channels, and there must be sufficient space allocated in `dest`.
+template <typename T>
+void CopyAudioIfNeeded(const T* const* src,
+                       int num_frames,
+                       int num_channels,
+                       T* const* dest) {
+  for (int i = 0; i < num_channels; ++i) {
+    if (src[i] != dest[i]) {
+      std::copy(src[i], src[i] + num_frames, dest[i]);
+    }
+  }
+}
+
+// Deinterleave audio from `interleaved` to the channel buffers pointed to
+// by `deinterleaved`. There must be sufficient space allocated in the
+// `deinterleaved` buffers (`num_channel` buffers with `samples_per_channel`
+// per buffer).
+template <typename T>
+void Deinterleave(const T* interleaved,
+                  size_t samples_per_channel,
+                  size_t num_channels,
+                  T* const* deinterleaved) {
+  for (size_t i = 0; i < num_channels; ++i) {
+    T* channel = deinterleaved[i];
+    size_t interleaved_idx = i;
+    for (size_t j = 0; j < samples_per_channel; ++j) {
+      channel[j] = interleaved[interleaved_idx];
+      interleaved_idx += num_channels;
+    }
+  }
+}
+
+// Interleave audio from the channel buffers pointed to by `deinterleaved` to
+// `interleaved`. There must be sufficient space allocated in `interleaved`
+// (`samples_per_channel` * `num_channels`).
+template <typename T>
+void Interleave(const T* const* deinterleaved,
+                size_t samples_per_channel,
+                size_t num_channels,
+                T* interleaved) {
+  for (size_t i = 0; i < num_channels; ++i) {
+    const T* channel = deinterleaved[i];
+    size_t interleaved_idx = i;
+    for (size_t j = 0; j < samples_per_channel; ++j) {
+      interleaved[interleaved_idx] = channel[j];
+      interleaved_idx += num_channels;
+    }
+  }
+}
+
+// Copies audio from a single channel buffer pointed to by `mono` to each
+// channel of `interleaved`. There must be sufficient space allocated in
+// `interleaved` (`samples_per_channel` * `num_channels`).
+template <typename T>
+void UpmixMonoToInterleaved(const T* mono,
+                            int num_frames,
+                            int num_channels,
+                            T* interleaved) {
+  int interleaved_idx = 0;
+  for (int i = 0; i < num_frames; ++i) {
+    for (int j = 0; j < num_channels; ++j) {
+      interleaved[interleaved_idx++] = mono[i];
+    }
+  }
+}
+
+template <typename T, typename Intermediate>
+void DownmixToMono(const T* const* input_channels,
+                   size_t num_frames,
+                   int num_channels,
+                   T* out) {
+  for (size_t i = 0; i < num_frames; ++i) {
+    Intermediate value = input_channels[0][i];
+    for (int j = 1; j < num_channels; ++j) {
+      value += input_channels[j][i];
+    }
+    out[i] = value / num_channels;
+  }
+}
+
+// Downmixes an interleaved multichannel signal to a single channel by averaging
+// all channels.
+template <typename T, typename Intermediate>
+void DownmixInterleavedToMonoImpl(const T* interleaved,
+                                  size_t num_frames,
+                                  int num_channels,
+                                  T* deinterleaved) {
+  RTC_DCHECK_GT(num_channels, 0);
+  RTC_DCHECK_GT(num_frames, 0);
+
+  const T* const end = interleaved + num_frames * num_channels;
+
+  while (interleaved < end) {
+    const T* const frame_end = interleaved + num_channels;
+
+    Intermediate value = *interleaved++;
+    while (interleaved < frame_end) {
+      value += *interleaved++;
+    }
+
+    *deinterleaved++ = value / num_channels;
+  }
+}
+
+template <typename T>
+void DownmixInterleavedToMono(const T* interleaved,
+                              size_t num_frames,
+                              int num_channels,
+                              T* deinterleaved);
+
+template <>
+void DownmixInterleavedToMono<int16_t>(const int16_t* interleaved,
+                                       size_t num_frames,
+                                       int num_channels,
+                                       int16_t* deinterleaved);
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_INCLUDE_AUDIO_UTIL_H_
diff --git a/third_party/libwebrtc/common_audio/intrin.h b/third_party/libwebrtc/common_audio/intrin.h
new file mode 100644
index 0000000000..f6ff7f218f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/intrin.h
@@ -0,0 +1,8 @@
+#if defined (__SSE__)
+  #include <immintrin.h>
+  #if defined (__clang__)
+    #include <avxintrin.h>
+    #include <avx2intrin.h>
+    #include <fmaintrin.h>
+  #endif
+#endif
diff --git a/third_party/libwebrtc/common_audio/mocks/mock_smoothing_filter.h b/third_party/libwebrtc/common_audio/mocks/mock_smoothing_filter.h
new file mode 100644
index 0000000000..9df49dd11a
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/mocks/mock_smoothing_filter.h
@@ -0,0 +1,28 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_MOCKS_MOCK_SMOOTHING_FILTER_H_
+#define COMMON_AUDIO_MOCKS_MOCK_SMOOTHING_FILTER_H_
+
+#include "common_audio/smoothing_filter.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockSmoothingFilter : public SmoothingFilter {
+ public:
+  MOCK_METHOD(void, AddSample, (float), (override));
+  MOCK_METHOD(absl::optional<float>, GetAverage, (), (override));
+  MOCK_METHOD(bool, SetTimeConstantMs, (int), (override));
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_MOCKS_MOCK_SMOOTHING_FILTER_H_
diff --git a/third_party/libwebrtc/common_audio/real_fourier.cc b/third_party/libwebrtc/common_audio/real_fourier.cc
new file mode 100644
index 0000000000..7365844e8d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/real_fourier.cc
@@ -0,0 +1,51 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/real_fourier.h"
+
+#include "common_audio/real_fourier_ooura.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+using std::complex;
+
+const size_t RealFourier::kFftBufferAlignment = 32;
+
+std::unique_ptr<RealFourier> RealFourier::Create(int fft_order) {
+  return std::unique_ptr<RealFourier>(new RealFourierOoura(fft_order));
+}
+
+int RealFourier::FftOrder(size_t length) {
+  RTC_CHECK_GT(length, 0U);
+  return WebRtcSpl_GetSizeInBits(static_cast<uint32_t>(length - 1));
+}
+
+size_t RealFourier::FftLength(int order) {
+  RTC_CHECK_GE(order, 0);
+  return size_t{1} << order;
+}
+
+size_t RealFourier::ComplexLength(int order) {
+  return FftLength(order) / 2 + 1;
+}
+
+RealFourier::fft_real_scoper RealFourier::AllocRealBuffer(int count) {
+  return fft_real_scoper(static_cast<float*>(
+      AlignedMalloc(sizeof(float) * count, kFftBufferAlignment)));
+}
+
+RealFourier::fft_cplx_scoper RealFourier::AllocCplxBuffer(int count) {
+  return fft_cplx_scoper(static_cast<complex<float>*>(
+      AlignedMalloc(sizeof(complex<float>) * count, kFftBufferAlignment)));
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/real_fourier.h b/third_party/libwebrtc/common_audio/real_fourier.h
new file mode 100644
index 0000000000..78a4fc6662
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/real_fourier.h
@@ -0,0 +1,76 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_REAL_FOURIER_H_
+#define COMMON_AUDIO_REAL_FOURIER_H_
+
+#include <stddef.h>
+
+#include <complex>
+#include <memory>
+
+#include "rtc_base/memory/aligned_malloc.h"
+
+// Uniform interface class for the real DFT and its inverse, for power-of-2
+// input lengths. Also contains helper functions for buffer allocation, taking
+// care of any memory alignment requirements the underlying library might have.
+
+namespace webrtc {
+
+class RealFourier {
+ public:
+  // Shorthand typenames for the scopers used by the buffer allocation helpers.
+  typedef std::unique_ptr<float[], AlignedFreeDeleter> fft_real_scoper;
+  typedef std::unique_ptr<std::complex<float>[], AlignedFreeDeleter>
+      fft_cplx_scoper;
+
+  // The alignment required for all input and output buffers, in bytes.
+  static const size_t kFftBufferAlignment;
+
+  // Construct a wrapper instance for the given input order, which must be
+  // between 1 and kMaxFftOrder, inclusively.
+  static std::unique_ptr<RealFourier> Create(int fft_order);
+  virtual ~RealFourier() {}
+
+  // Helper to compute the smallest FFT order (a power of 2) which will contain
+  // the given input length.
+  static int FftOrder(size_t length);
+
+  // Helper to compute the input length from the FFT order.
+  static size_t FftLength(int order);
+
+  // Helper to compute the exact length, in complex floats, of the transform
+  // output (i.e. |2^order / 2 + 1|).
+  static size_t ComplexLength(int order);
+
+  // Buffer allocation helpers. The buffers are large enough to hold `count`
+  // floats/complexes and suitably aligned for use by the implementation.
+  // The returned scopers are set up with proper deleters; the caller owns
+  // the allocated memory.
+  static fft_real_scoper AllocRealBuffer(int count);
+  static fft_cplx_scoper AllocCplxBuffer(int count);
+
+  // Main forward transform interface. The output array need only be big
+  // enough for |2^order / 2 + 1| elements - the conjugate pairs are not
+  // returned. Input and output must be properly aligned (e.g. through
+  // AllocRealBuffer and AllocCplxBuffer) and input length must be
+  // |2^order| (same as given at construction time).
+  virtual void Forward(const float* src, std::complex<float>* dest) const = 0;
+
+  // Inverse transform. Same input format as output above, conjugate pairs
+  // not needed.
+  virtual void Inverse(const std::complex<float>* src, float* dest) const = 0;
+
+  virtual int order() const = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_REAL_FOURIER_H_
diff --git a/third_party/libwebrtc/common_audio/real_fourier_ooura.cc b/third_party/libwebrtc/common_audio/real_fourier_ooura.cc
new file mode 100644
index 0000000000..9acda5494c
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/real_fourier_ooura.cc
@@ -0,0 +1,91 @@
+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/real_fourier_ooura.h"
+
+#include <algorithm>
+#include <cmath>
+
+#include "common_audio/third_party/ooura/fft_size_256/fft4g.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+using std::complex;
+
+namespace {
+
+void Conjugate(complex<float>* array, size_t complex_length) {
+  std::for_each(array, array + complex_length,
+                [=](complex<float>& v) { v = std::conj(v); });
+}
+
+size_t ComputeWorkIpSize(size_t fft_length) {
+  return static_cast<size_t>(
+      2 + std::ceil(std::sqrt(static_cast<float>(fft_length))));
+}
+
+}  // namespace
+
+RealFourierOoura::RealFourierOoura(int fft_order)
+    : order_(fft_order),
+      length_(FftLength(order_)),
+      complex_length_(ComplexLength(order_)),
+      // Zero-initializing work_ip_ will cause rdft to initialize these work
+      // arrays on the first call.
+      work_ip_(new size_t[ComputeWorkIpSize(length_)]()),
+      work_w_(new float[complex_length_]()) {
+  RTC_CHECK_GE(fft_order, 1);
+}
+
+RealFourierOoura::~RealFourierOoura() = default;
+
+void RealFourierOoura::Forward(const float* src, complex<float>* dest) const {
+  {
+    // This cast is well-defined since C++11. See "Non-static data members" at:
+    // http://en.cppreference.com/w/cpp/numeric/complex
+    auto* dest_float = reinterpret_cast<float*>(dest);
+    std::copy(src, src + length_, dest_float);
+    WebRtc_rdft(length_, 1, dest_float, work_ip_.get(), work_w_.get());
+  }
+
+  // Ooura places real[n/2] in imag[0].
+  dest[complex_length_ - 1] = complex<float>(dest[0].imag(), 0.0f);
+  dest[0] = complex<float>(dest[0].real(), 0.0f);
+  // Ooura returns the conjugate of the usual Fourier definition.
+  Conjugate(dest, complex_length_);
+}
+
+void RealFourierOoura::Inverse(const complex<float>* src, float* dest) const {
+  {
+    auto* dest_complex = reinterpret_cast<complex<float>*>(dest);
+    // The real output array is shorter than the input complex array by one
+    // complex element.
+    const size_t dest_complex_length = complex_length_ - 1;
+    std::copy(src, src + dest_complex_length, dest_complex);
+    // Restore Ooura's conjugate definition.
+    Conjugate(dest_complex, dest_complex_length);
+    // Restore real[n/2] to imag[0].
+    dest_complex[0] =
+        complex<float>(dest_complex[0].real(), src[complex_length_ - 1].real());
+  }
+
+  WebRtc_rdft(length_, -1, dest, work_ip_.get(), work_w_.get());
+
+  // Ooura returns a scaled version.
+  const float scale = 2.0f / length_;
+  std::for_each(dest, dest + length_, [scale](float& v) { v *= scale; });
+}
+
+int RealFourierOoura::order() const {
+  return order_;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/real_fourier_ooura.h b/third_party/libwebrtc/common_audio/real_fourier_ooura.h
new file mode 100644
index 0000000000..ae85dfd0dd
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/real_fourier_ooura.h
@@ -0,0 +1,45 @@
+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_REAL_FOURIER_OOURA_H_
+#define COMMON_AUDIO_REAL_FOURIER_OOURA_H_
+
+#include <stddef.h>
+
+#include <complex>
+#include <memory>
+
+#include "common_audio/real_fourier.h"
+
+namespace webrtc {
+
+class RealFourierOoura : public RealFourier {
+ public:
+  explicit RealFourierOoura(int fft_order);
+  ~RealFourierOoura() override;
+
+  void Forward(const float* src, std::complex<float>* dest) const override;
+  void Inverse(const std::complex<float>* src, float* dest) const override;
+
+  int order() const override;
+
+ private:
+  const int order_;
+  const size_t length_;
+  const size_t complex_length_;
+  // These are work arrays for Ooura. The names are based on the comments in
+  // common_audio/third_party/ooura/fft_size_256/fft4g.cc.
+  const std::unique_ptr<size_t[]> work_ip_;
+  const std::unique_ptr<float[]> work_w_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_REAL_FOURIER_OOURA_H_
diff --git a/third_party/libwebrtc/common_audio/real_fourier_unittest.cc b/third_party/libwebrtc/common_audio/real_fourier_unittest.cc
new file mode 100644
index 0000000000..eac4fce42e
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/real_fourier_unittest.cc
@@ -0,0 +1,102 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/real_fourier.h"
+
+#include <stdlib.h>
+
+#include "common_audio/real_fourier_ooura.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+
+using std::complex;
+
+TEST(RealFourierStaticsTest, AllocatorAlignment) {
+  {
+    RealFourier::fft_real_scoper real;
+    real = RealFourier::AllocRealBuffer(3);
+    ASSERT_TRUE(real.get() != nullptr);
+    uintptr_t ptr_value = reinterpret_cast<uintptr_t>(real.get());
+    EXPECT_EQ(0u, ptr_value % RealFourier::kFftBufferAlignment);
+  }
+  {
+    RealFourier::fft_cplx_scoper cplx;
+    cplx = RealFourier::AllocCplxBuffer(3);
+    ASSERT_TRUE(cplx.get() != nullptr);
+    uintptr_t ptr_value = reinterpret_cast<uintptr_t>(cplx.get());
+    EXPECT_EQ(0u, ptr_value % RealFourier::kFftBufferAlignment);
+  }
+}
+
+TEST(RealFourierStaticsTest, OrderComputation) {
+  EXPECT_EQ(4, RealFourier::FftOrder(13));
+  EXPECT_EQ(5, RealFourier::FftOrder(32));
+  EXPECT_EQ(1, RealFourier::FftOrder(2));
+  EXPECT_EQ(0, RealFourier::FftOrder(1));
+}
+
+TEST(RealFourierStaticsTest, ComplexLengthComputation) {
+  EXPECT_EQ(2U, RealFourier::ComplexLength(1));
+  EXPECT_EQ(3U, RealFourier::ComplexLength(2));
+  EXPECT_EQ(5U, RealFourier::ComplexLength(3));
+  EXPECT_EQ(9U, RealFourier::ComplexLength(4));
+  EXPECT_EQ(17U, RealFourier::ComplexLength(5));
+  EXPECT_EQ(65U, RealFourier::ComplexLength(7));
+}
+
+template <typename T>
+class RealFourierTest : public ::testing::Test {
+ protected:
+  RealFourierTest()
+      : rf_(2),
+        real_buffer_(RealFourier::AllocRealBuffer(4)),
+        cplx_buffer_(RealFourier::AllocCplxBuffer(3)) {}
+
+  ~RealFourierTest() {}
+
+  T rf_;
+  const RealFourier::fft_real_scoper real_buffer_;
+  const RealFourier::fft_cplx_scoper cplx_buffer_;
+};
+
+using FftTypes = ::testing::Types<RealFourierOoura>;
+TYPED_TEST_SUITE(RealFourierTest, FftTypes);
+
+TYPED_TEST(RealFourierTest, SimpleForwardTransform) {
+  this->real_buffer_[0] = 1.0f;
+  this->real_buffer_[1] = 2.0f;
+  this->real_buffer_[2] = 3.0f;
+  this->real_buffer_[3] = 4.0f;
+
+  this->rf_.Forward(this->real_buffer_.get(), this->cplx_buffer_.get());
+
+  EXPECT_NEAR(this->cplx_buffer_[0].real(), 10.0f, 1e-8f);
+  EXPECT_NEAR(this->cplx_buffer_[0].imag(), 0.0f, 1e-8f);
+  EXPECT_NEAR(this->cplx_buffer_[1].real(), -2.0f, 1e-8f);
+  EXPECT_NEAR(this->cplx_buffer_[1].imag(), 2.0f, 1e-8f);
+  EXPECT_NEAR(this->cplx_buffer_[2].real(), -2.0f, 1e-8f);
+  EXPECT_NEAR(this->cplx_buffer_[2].imag(), 0.0f, 1e-8f);
+}
+
+TYPED_TEST(RealFourierTest, SimpleBackwardTransform) {
+  this->cplx_buffer_[0] = complex<float>(10.0f, 0.0f);
+  this->cplx_buffer_[1] = complex<float>(-2.0f, 2.0f);
+  this->cplx_buffer_[2] = complex<float>(-2.0f, 0.0f);
+
+  this->rf_.Inverse(this->cplx_buffer_.get(), this->real_buffer_.get());
+
+  EXPECT_NEAR(this->real_buffer_[0], 1.0f, 1e-8f);
+  EXPECT_NEAR(this->real_buffer_[1], 2.0f, 1e-8f);
+  EXPECT_NEAR(this->real_buffer_[2], 3.0f, 1e-8f);
+  EXPECT_NEAR(this->real_buffer_[3], 4.0f, 1e-8f);
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/include/push_resampler.h b/third_party/libwebrtc/common_audio/resampler/include/push_resampler.h
new file mode 100644
index 0000000000..3da67120f0
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/include/push_resampler.h
@@ -0,0 +1,59 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_
+#define COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_
+
+#include <memory>
+#include <vector>
+
+namespace webrtc {
+
+class PushSincResampler;
+
+// Wraps PushSincResampler to provide stereo support.
+// TODO(ajm): add support for an arbitrary number of channels.
+template <typename T>
+class PushResampler {
+ public:
+  PushResampler();
+  virtual ~PushResampler();
+
+  // Must be called whenever the parameters change. Free to be called at any
+  // time as it is a no-op if parameters have not changed since the last call.
+  int InitializeIfNeeded(int src_sample_rate_hz,
+                         int dst_sample_rate_hz,
+                         size_t num_channels);
+
+  // Returns the total number of samples provided in destination (e.g. 32 kHz,
+  // 2 channel audio gives 640 samples).
+  int Resample(const T* src, size_t src_length, T* dst, size_t dst_capacity);
+
+ private:
+  int src_sample_rate_hz_;
+  int dst_sample_rate_hz_;
+  size_t num_channels_;
+  // Vector that is needed to provide the proper inputs and outputs to the
+  // interleave/de-interleave methods used in Resample. This needs to be
+  // heap-allocated on the state to support an arbitrary number of channels
+  // without doing run-time heap-allocations in the Resample method.
+  std::vector<T*> channel_data_array_;
+
+  struct ChannelResampler {
+    std::unique_ptr<PushSincResampler> resampler;
+    std::vector<T> source;
+    std::vector<T> destination;
+  };
+
+  std::vector<ChannelResampler> channel_resamplers_;
+};
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_RESAMPLER_INCLUDE_PUSH_RESAMPLER_H_
diff --git a/third_party/libwebrtc/common_audio/resampler/include/resampler.h b/third_party/libwebrtc/common_audio/resampler/include/resampler.h
new file mode 100644
index 0000000000..41940f9a12
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/include/resampler.h
@@ -0,0 +1,99 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * A wrapper for resampling a numerous amount of sampling combinations.
+ */
+
+#ifndef COMMON_AUDIO_RESAMPLER_INCLUDE_RESAMPLER_H_
+#define COMMON_AUDIO_RESAMPLER_INCLUDE_RESAMPLER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+namespace webrtc {
+
+// All methods return 0 on success and -1 on failure.
+class Resampler {
+ public:
+  Resampler();
+  Resampler(int inFreq, int outFreq, size_t num_channels);
+  ~Resampler();
+
+  // Reset all states
+  int Reset(int inFreq, int outFreq, size_t num_channels);
+
+  // Reset all states if any parameter has changed
+  int ResetIfNeeded(int inFreq, int outFreq, size_t num_channels);
+
+  // Resample samplesIn to samplesOut.
+  int Push(const int16_t* samplesIn,
+           size_t lengthIn,
+           int16_t* samplesOut,
+           size_t maxLen,
+           size_t& outLen);  // NOLINT: to avoid changing APIs
+
+ private:
+  enum ResamplerMode {
+    kResamplerMode1To1,
+    kResamplerMode1To2,
+    kResamplerMode1To3,
+    kResamplerMode1To4,
+    kResamplerMode1To6,
+    kResamplerMode1To12,
+    kResamplerMode2To3,
+    kResamplerMode2To11,
+    kResamplerMode4To11,
+    kResamplerMode8To11,
+    kResamplerMode11To16,
+    kResamplerMode11To32,
+    kResamplerMode2To1,
+    kResamplerMode3To1,
+    kResamplerMode4To1,
+    kResamplerMode6To1,
+    kResamplerMode12To1,
+    kResamplerMode3To2,
+    kResamplerMode11To2,
+    kResamplerMode11To4,
+    kResamplerMode11To8
+  };
+
+  // Computes the resampler mode for a given sampling frequency pair.
+  // Returns -1 for unsupported frequency pairs.
+  static int ComputeResamplerMode(int in_freq_hz,
+                                  int out_freq_hz,
+                                  ResamplerMode* mode);
+
+  // Generic pointers since we don't know what states we'll need
+  void* state1_;
+  void* state2_;
+  void* state3_;
+
+  // Storage if needed
+  int16_t* in_buffer_;
+  int16_t* out_buffer_;
+  size_t in_buffer_size_;
+  size_t out_buffer_size_;
+  size_t in_buffer_size_max_;
+  size_t out_buffer_size_max_;
+
+  int my_in_frequency_khz_;
+  int my_out_frequency_khz_;
+  ResamplerMode my_mode_;
+  size_t num_channels_;
+
+  // Extra instance for stereo
+  Resampler* helper_left_;
+  Resampler* helper_right_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_RESAMPLER_INCLUDE_RESAMPLER_H_
diff --git a/third_party/libwebrtc/common_audio/resampler/push_resampler.cc b/third_party/libwebrtc/common_audio/resampler/push_resampler.cc
new file mode 100644
index 0000000000..810d778993
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/push_resampler.cc
@@ -0,0 +1,123 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/resampler/include/push_resampler.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include <memory>
+
+#include "common_audio/include/audio_util.h"
+#include "common_audio/resampler/push_sinc_resampler.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+template <typename T>
+PushResampler<T>::PushResampler()
+    : src_sample_rate_hz_(0), dst_sample_rate_hz_(0), num_channels_(0) {}
+
+template <typename T>
+PushResampler<T>::~PushResampler() {}
+
+template <typename T>
+int PushResampler<T>::InitializeIfNeeded(int src_sample_rate_hz,
+                                         int dst_sample_rate_hz,
+                                         size_t num_channels) {
+  // These checks used to be factored out of this template function due to
+  // Windows debug build issues with clang. http://crbug.com/615050
+  RTC_DCHECK_GT(src_sample_rate_hz, 0);
+  RTC_DCHECK_GT(dst_sample_rate_hz, 0);
+  RTC_DCHECK_GT(num_channels, 0);
+
+  if (src_sample_rate_hz == src_sample_rate_hz_ &&
+      dst_sample_rate_hz == dst_sample_rate_hz_ &&
+      num_channels == num_channels_) {
+    // No-op if settings haven't changed.
+    return 0;
+  }
+
+  if (src_sample_rate_hz <= 0 || dst_sample_rate_hz <= 0 || num_channels <= 0) {
+    return -1;
+  }
+
+  src_sample_rate_hz_ = src_sample_rate_hz;
+  dst_sample_rate_hz_ = dst_sample_rate_hz;
+  num_channels_ = num_channels;
+
+  const size_t src_size_10ms_mono =
+      static_cast<size_t>(src_sample_rate_hz / 100);
+  const size_t dst_size_10ms_mono =
+      static_cast<size_t>(dst_sample_rate_hz / 100);
+  channel_resamplers_.clear();
+  for (size_t i = 0; i < num_channels; ++i) {
+    channel_resamplers_.push_back(ChannelResampler());
+    auto channel_resampler = channel_resamplers_.rbegin();
+    channel_resampler->resampler = std::make_unique<PushSincResampler>(
+        src_size_10ms_mono, dst_size_10ms_mono);
+    channel_resampler->source.resize(src_size_10ms_mono);
+    channel_resampler->destination.resize(dst_size_10ms_mono);
+  }
+
+  channel_data_array_.resize(num_channels_);
+
+  return 0;
+}
+
+template <typename T>
+int PushResampler<T>::Resample(const T* src,
+                               size_t src_length,
+                               T* dst,
+                               size_t dst_capacity) {
+  // These checks used to be factored out of this template function due to
+  // Windows debug build issues with clang. http://crbug.com/615050
+  const size_t src_size_10ms = (src_sample_rate_hz_ / 100) * num_channels_;
+  const size_t dst_size_10ms = (dst_sample_rate_hz_ / 100) * num_channels_;
+  RTC_DCHECK_EQ(src_length, src_size_10ms);
+  RTC_DCHECK_GE(dst_capacity, dst_size_10ms);
+
+  if (src_sample_rate_hz_ == dst_sample_rate_hz_) {
+    // The old resampler provides this memcpy facility in the case of matching
+    // sample rates, so reproduce it here for the sinc resampler.
+    memcpy(dst, src, src_length * sizeof(T));
+    return static_cast<int>(src_length);
+  }
+
+  const size_t src_length_mono = src_length / num_channels_;
+  const size_t dst_capacity_mono = dst_capacity / num_channels_;
+
+  for (size_t ch = 0; ch < num_channels_; ++ch) {
+    channel_data_array_[ch] = channel_resamplers_[ch].source.data();
+  }
+
+  Deinterleave(src, src_length_mono, num_channels_, channel_data_array_.data());
+
+  size_t dst_length_mono = 0;
+
+  for (auto& resampler : channel_resamplers_) {
+    dst_length_mono = resampler.resampler->Resample(
+        resampler.source.data(), src_length_mono, resampler.destination.data(),
+        dst_capacity_mono);
+  }
+
+  for (size_t ch = 0; ch < num_channels_; ++ch) {
+    channel_data_array_[ch] = channel_resamplers_[ch].destination.data();
+  }
+
+  Interleave(channel_data_array_.data(), dst_length_mono, num_channels_, dst);
+  return static_cast<int>(dst_length_mono * num_channels_);
+}
+
+// Explictly generate required instantiations.
+template class PushResampler<int16_t>;
+template class PushResampler<float>;
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/push_resampler_unittest.cc b/third_party/libwebrtc/common_audio/resampler/push_resampler_unittest.cc
new file mode 100644
index 0000000000..91f2233aad
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/push_resampler_unittest.cc
@@ -0,0 +1,48 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/resampler/include/push_resampler.h"
+
+#include "rtc_base/checks.h"  // RTC_DCHECK_IS_ON
+#include "test/gtest.h"
+#include "test/testsupport/rtc_expect_death.h"
+
+// Quality testing of PushResampler is done in audio/remix_resample_unittest.cc.
+
+namespace webrtc {
+
+TEST(PushResamplerTest, VerifiesInputParameters) {
+  PushResampler<int16_t> resampler;
+  EXPECT_EQ(0, resampler.InitializeIfNeeded(16000, 16000, 1));
+  EXPECT_EQ(0, resampler.InitializeIfNeeded(16000, 16000, 2));
+  EXPECT_EQ(0, resampler.InitializeIfNeeded(16000, 16000, 8));
+}
+
+#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
+TEST(PushResamplerDeathTest, VerifiesBadInputParameters1) {
+  PushResampler<int16_t> resampler;
+  RTC_EXPECT_DEATH(resampler.InitializeIfNeeded(-1, 16000, 1),
+                   "src_sample_rate_hz");
+}
+
+TEST(PushResamplerDeathTest, VerifiesBadInputParameters2) {
+  PushResampler<int16_t> resampler;
+  RTC_EXPECT_DEATH(resampler.InitializeIfNeeded(16000, -1, 1),
+                   "dst_sample_rate_hz");
+}
+
+TEST(PushResamplerDeathTest, VerifiesBadInputParameters3) {
+  PushResampler<int16_t> resampler;
+  RTC_EXPECT_DEATH(resampler.InitializeIfNeeded(16000, 16000, 0),
+                   "num_channels");
+}
+#endif
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler.cc b/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler.cc
new file mode 100644
index 0000000000..d4b7eed026
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler.cc
@@ -0,0 +1,102 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/resampler/push_sinc_resampler.h"
+
+#include <cstring>
+
+#include "common_audio/include/audio_util.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+PushSincResampler::PushSincResampler(size_t source_frames,
+                                     size_t destination_frames)
+    : resampler_(new SincResampler(source_frames * 1.0 / destination_frames,
+                                   source_frames,
+                                   this)),
+      source_ptr_(nullptr),
+      source_ptr_int_(nullptr),
+      destination_frames_(destination_frames),
+      first_pass_(true),
+      source_available_(0) {}
+
+PushSincResampler::~PushSincResampler() {}
+
+size_t PushSincResampler::Resample(const int16_t* source,
+                                   size_t source_length,
+                                   int16_t* destination,
+                                   size_t destination_capacity) {
+  if (!float_buffer_.get())
+    float_buffer_.reset(new float[destination_frames_]);
+
+  source_ptr_int_ = source;
+  // Pass nullptr as the float source to have Run() read from the int16 source.
+  Resample(nullptr, source_length, float_buffer_.get(), destination_frames_);
+  FloatS16ToS16(float_buffer_.get(), destination_frames_, destination);
+  source_ptr_int_ = nullptr;
+  return destination_frames_;
+}
+
+size_t PushSincResampler::Resample(const float* source,
+                                   size_t source_length,
+                                   float* destination,
+                                   size_t destination_capacity) {
+  RTC_CHECK_EQ(source_length, resampler_->request_frames());
+  RTC_CHECK_GE(destination_capacity, destination_frames_);
+  // Cache the source pointer. Calling Resample() will immediately trigger
+  // the Run() callback whereupon we provide the cached value.
+  source_ptr_ = source;
+  source_available_ = source_length;
+
+  // On the first pass, we call Resample() twice. During the first call, we
+  // provide dummy input and discard the output. This is done to prime the
+  // SincResampler buffer with the correct delay (half the kernel size), thereby
+  // ensuring that all later Resample() calls will only result in one input
+  // request through Run().
+  //
+  // If this wasn't done, SincResampler would call Run() twice on the first
+  // pass, and we'd have to introduce an entire `source_frames` of delay, rather
+  // than the minimum half kernel.
+  //
+  // It works out that ChunkSize() is exactly the amount of output we need to
+  // request in order to prime the buffer with a single Run() request for
+  // `source_frames`.
+  if (first_pass_)
+    resampler_->Resample(resampler_->ChunkSize(), destination);
+
+  resampler_->Resample(destination_frames_, destination);
+  source_ptr_ = nullptr;
+  return destination_frames_;
+}
+
+void PushSincResampler::Run(size_t frames, float* destination) {
+  // Ensure we are only asked for the available samples. This would fail if
+  // Run() was triggered more than once per Resample() call.
+  RTC_CHECK_EQ(source_available_, frames);
+
+  if (first_pass_) {
+    // Provide dummy input on the first pass, the output of which will be
+    // discarded, as described in Resample().
+    std::memset(destination, 0, frames * sizeof(*destination));
+    first_pass_ = false;
+    return;
+  }
+
+  if (source_ptr_) {
+    std::memcpy(destination, source_ptr_, frames * sizeof(*destination));
+  } else {
+    for (size_t i = 0; i < frames; ++i)
+      destination[i] = static_cast<float>(source_ptr_int_[i]);
+  }
+  source_available_ -= frames;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler.h b/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler.h
new file mode 100644
index 0000000000..7946ef8f82
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler.h
@@ -0,0 +1,81 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_RESAMPLER_PUSH_SINC_RESAMPLER_H_
+#define COMMON_AUDIO_RESAMPLER_PUSH_SINC_RESAMPLER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <memory>
+
+#include "common_audio/resampler/sinc_resampler.h"
+
+namespace webrtc {
+
+// A thin wrapper over SincResampler to provide a push-based interface as
+// required by WebRTC. SincResampler uses a pull-based interface, and will
+// use SincResamplerCallback::Run() to request data upon a call to Resample().
+// These Run() calls will happen on the same thread Resample() is called on.
+class PushSincResampler : public SincResamplerCallback {
+ public:
+  // Provide the size of the source and destination blocks in samples. These
+  // must correspond to the same time duration (typically 10 ms) as the sample
+  // ratio is inferred from them.
+  PushSincResampler(size_t source_frames, size_t destination_frames);
+  ~PushSincResampler() override;
+
+  PushSincResampler(const PushSincResampler&) = delete;
+  PushSincResampler& operator=(const PushSincResampler&) = delete;
+
+  // Perform the resampling. `source_frames` must always equal the
+  // `source_frames` provided at construction. `destination_capacity` must be
+  // at least as large as `destination_frames`. Returns the number of samples
+  // provided in destination (for convenience, since this will always be equal
+  // to `destination_frames`).
+  size_t Resample(const int16_t* source,
+                  size_t source_frames,
+                  int16_t* destination,
+                  size_t destination_capacity);
+  size_t Resample(const float* source,
+                  size_t source_frames,
+                  float* destination,
+                  size_t destination_capacity);
+
+  // Delay due to the filter kernel. Essentially, the time after which an input
+  // sample will appear in the resampled output.
+  static float AlgorithmicDelaySeconds(int source_rate_hz) {
+    return 1.f / source_rate_hz * SincResampler::kKernelSize / 2;
+  }
+
+ protected:
+  // Implements SincResamplerCallback.
+  void Run(size_t frames, float* destination) override;
+
+ private:
+  friend class PushSincResamplerTest;
+  SincResampler* get_resampler_for_testing() { return resampler_.get(); }
+
+  std::unique_ptr<SincResampler> resampler_;
+  std::unique_ptr<float[]> float_buffer_;
+  const float* source_ptr_;
+  const int16_t* source_ptr_int_;
+  const size_t destination_frames_;
+
+  // True on the first call to Resample(), to prime the SincResampler buffer.
+  bool first_pass_;
+
+  // Used to assert we are only requested for as much data as is available.
+  size_t source_available_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_RESAMPLER_PUSH_SINC_RESAMPLER_H_
diff --git a/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler_unittest.cc b/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler_unittest.cc
new file mode 100644
index 0000000000..8f82199d1d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/push_sinc_resampler_unittest.cc
@@ -0,0 +1,367 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/resampler/push_sinc_resampler.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cstring>
+#include <memory>
+
+#include "common_audio/include/audio_util.h"
+#include "common_audio/resampler/sinusoidal_linear_chirp_source.h"
+#include "rtc_base/time_utils.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace {
+
+// Almost all conversions have an RMS error of around -14 dbFS.
+const double kResamplingRMSError = -14.42;
+
+// Used to convert errors to dbFS.
+template <typename T>
+T DBFS(T x) {
+  return 20 * std::log10(x);
+}
+
+}  // namespace
+
+class PushSincResamplerTest : public ::testing::TestWithParam<
+                                  ::testing::tuple<int, int, double, double>> {
+ public:
+  PushSincResamplerTest()
+      : input_rate_(::testing::get<0>(GetParam())),
+        output_rate_(::testing::get<1>(GetParam())),
+        rms_error_(::testing::get<2>(GetParam())),
+        low_freq_error_(::testing::get<3>(GetParam())) {}
+
+  ~PushSincResamplerTest() override {}
+
+ protected:
+  void ResampleBenchmarkTest(bool int_format);
+  void ResampleTest(bool int_format);
+
+  int input_rate_;
+  int output_rate_;
+  double rms_error_;
+  double low_freq_error_;
+};
+
+class ZeroSource : public SincResamplerCallback {
+ public:
+  void Run(size_t frames, float* destination) override {
+    std::memset(destination, 0, sizeof(float) * frames);
+  }
+};
+
+void PushSincResamplerTest::ResampleBenchmarkTest(bool int_format) {
+  const size_t input_samples = static_cast<size_t>(input_rate_ / 100);
+  const size_t output_samples = static_cast<size_t>(output_rate_ / 100);
+  const int kResampleIterations = 500000;
+
+  // Source for data to be resampled.
+  ZeroSource resampler_source;
+
+  std::unique_ptr<float[]> resampled_destination(new float[output_samples]);
+  std::unique_ptr<float[]> source(new float[input_samples]);
+  std::unique_ptr<int16_t[]> source_int(new int16_t[input_samples]);
+  std::unique_ptr<int16_t[]> destination_int(new int16_t[output_samples]);
+
+  resampler_source.Run(input_samples, source.get());
+  for (size_t i = 0; i < input_samples; ++i) {
+    source_int[i] = static_cast<int16_t>(floor(32767 * source[i] + 0.5));
+  }
+
+  printf("Benchmarking %d iterations of %d Hz -> %d Hz:\n", kResampleIterations,
+         input_rate_, output_rate_);
+  const double io_ratio = input_rate_ / static_cast<double>(output_rate_);
+  SincResampler sinc_resampler(io_ratio, SincResampler::kDefaultRequestSize,
+                               &resampler_source);
+  int64_t start = rtc::TimeNanos();
+  for (int i = 0; i < kResampleIterations; ++i) {
+    sinc_resampler.Resample(output_samples, resampled_destination.get());
+  }
+  double total_time_sinc_us =
+      (rtc::TimeNanos() - start) / rtc::kNumNanosecsPerMicrosec;
+  printf("SincResampler took %.2f us per frame.\n",
+         total_time_sinc_us / kResampleIterations);
+
+  PushSincResampler resampler(input_samples, output_samples);
+  start = rtc::TimeNanos();
+  if (int_format) {
+    for (int i = 0; i < kResampleIterations; ++i) {
+      EXPECT_EQ(output_samples,
+                resampler.Resample(source_int.get(), input_samples,
+                                   destination_int.get(), output_samples));
+    }
+  } else {
+    for (int i = 0; i < kResampleIterations; ++i) {
+      EXPECT_EQ(output_samples, resampler.Resample(source.get(), input_samples,
+                                                   resampled_destination.get(),
+                                                   output_samples));
+    }
+  }
+  double total_time_us =
+      (rtc::TimeNanos() - start) / rtc::kNumNanosecsPerMicrosec;
+  printf(
+      "PushSincResampler took %.2f us per frame; which is a %.1f%% overhead "
+      "on SincResampler.\n\n",
+      total_time_us / kResampleIterations,
+      (total_time_us - total_time_sinc_us) / total_time_sinc_us * 100);
+}
+
+// Disabled because it takes too long to run routinely. Use for performance
+// benchmarking when needed.
+TEST_P(PushSincResamplerTest, DISABLED_BenchmarkInt) {
+  ResampleBenchmarkTest(true);
+}
+
+TEST_P(PushSincResamplerTest, DISABLED_BenchmarkFloat) {
+  ResampleBenchmarkTest(false);
+}
+
+// Tests resampling using a given input and output sample rate.
+void PushSincResamplerTest::ResampleTest(bool int_format) {
+  // Make comparisons using one second of data.
+  static const double kTestDurationSecs = 1;
+  // 10 ms blocks.
+  const size_t kNumBlocks = static_cast<size_t>(kTestDurationSecs * 100);
+  const size_t input_block_size = static_cast<size_t>(input_rate_ / 100);
+  const size_t output_block_size = static_cast<size_t>(output_rate_ / 100);
+  const size_t input_samples =
+      static_cast<size_t>(kTestDurationSecs * input_rate_);
+  const size_t output_samples =
+      static_cast<size_t>(kTestDurationSecs * output_rate_);
+
+  // Nyquist frequency for the input sampling rate.
+  const double input_nyquist_freq = 0.5 * input_rate_;
+
+  // Source for data to be resampled.
+  SinusoidalLinearChirpSource resampler_source(input_rate_, input_samples,
+                                               input_nyquist_freq, 0);
+
+  PushSincResampler resampler(input_block_size, output_block_size);
+
+  // TODO(dalecurtis): If we switch to AVX/SSE optimization, we'll need to
+  // allocate these on 32-byte boundaries and ensure they're sized % 32 bytes.
+  std::unique_ptr<float[]> resampled_destination(new float[output_samples]);
+  std::unique_ptr<float[]> pure_destination(new float[output_samples]);
+  std::unique_ptr<float[]> source(new float[input_samples]);
+  std::unique_ptr<int16_t[]> source_int(new int16_t[input_block_size]);
+  std::unique_ptr<int16_t[]> destination_int(new int16_t[output_block_size]);
+
+  // The sinc resampler has an implicit delay of approximately half the kernel
+  // size at the input sample rate. By moving to a push model, this delay
+  // becomes explicit and is managed by zero-stuffing in PushSincResampler. We
+  // deal with it in the test by delaying the "pure" source to match. It must be
+  // checked before the first call to Resample(), because ChunkSize() will
+  // change afterwards.
+  const size_t output_delay_samples =
+      output_block_size - resampler.get_resampler_for_testing()->ChunkSize();
+
+  // Generate resampled signal.
+  // With the PushSincResampler, we produce the signal block-by-10ms-block
+  // rather than in a single pass, to exercise how it will be used in WebRTC.
+  resampler_source.Run(input_samples, source.get());
+  if (int_format) {
+    for (size_t i = 0; i < kNumBlocks; ++i) {
+      FloatToS16(&source[i * input_block_size], input_block_size,
+                 source_int.get());
+      EXPECT_EQ(output_block_size,
+                resampler.Resample(source_int.get(), input_block_size,
+                                   destination_int.get(), output_block_size));
+      S16ToFloat(destination_int.get(), output_block_size,
+                 &resampled_destination[i * output_block_size]);
+    }
+  } else {
+    for (size_t i = 0; i < kNumBlocks; ++i) {
+      EXPECT_EQ(
+          output_block_size,
+          resampler.Resample(&source[i * input_block_size], input_block_size,
+                             &resampled_destination[i * output_block_size],
+                             output_block_size));
+    }
+  }
+
+  // Generate pure signal.
+  SinusoidalLinearChirpSource pure_source(
+      output_rate_, output_samples, input_nyquist_freq, output_delay_samples);
+  pure_source.Run(output_samples, pure_destination.get());
+
+  // Range of the Nyquist frequency (0.5 * min(input rate, output_rate)) which
+  // we refer to as low and high.
+  static const double kLowFrequencyNyquistRange = 0.7;
+  static const double kHighFrequencyNyquistRange = 0.9;
+
+  // Calculate Root-Mean-Square-Error and maximum error for the resampling.
+  double sum_of_squares = 0;
+  double low_freq_max_error = 0;
+  double high_freq_max_error = 0;
+  int minimum_rate = std::min(input_rate_, output_rate_);
+  double low_frequency_range = kLowFrequencyNyquistRange * 0.5 * minimum_rate;
+  double high_frequency_range = kHighFrequencyNyquistRange * 0.5 * minimum_rate;
+
+  for (size_t i = 0; i < output_samples; ++i) {
+    double error = fabs(resampled_destination[i] - pure_destination[i]);
+
+    if (pure_source.Frequency(i) < low_frequency_range) {
+      if (error > low_freq_max_error)
+        low_freq_max_error = error;
+    } else if (pure_source.Frequency(i) < high_frequency_range) {
+      if (error > high_freq_max_error)
+        high_freq_max_error = error;
+    }
+    // TODO(dalecurtis): Sanity check frequencies > kHighFrequencyNyquistRange.
+
+    sum_of_squares += error * error;
+  }
+
+  double rms_error = sqrt(sum_of_squares / output_samples);
+
+  rms_error = DBFS(rms_error);
+  // In order to keep the thresholds in this test identical to SincResamplerTest
+  // we must account for the quantization error introduced by truncating from
+  // float to int. This happens twice (once at input and once at output) and we
+  // allow for the maximum possible error (1 / 32767) for each step.
+  //
+  // The quantization error is insignificant in the RMS calculation so does not
+  // need to be accounted for there.
+  low_freq_max_error = DBFS(low_freq_max_error - 2.0 / 32767);
+  high_freq_max_error = DBFS(high_freq_max_error - 2.0 / 32767);
+
+  EXPECT_LE(rms_error, rms_error_);
+  EXPECT_LE(low_freq_max_error, low_freq_error_);
+
+  // All conversions currently have a high frequency error around -6 dbFS.
+  static const double kHighFrequencyMaxError = -6.01;
+  EXPECT_LE(high_freq_max_error, kHighFrequencyMaxError);
+}
+
+TEST_P(PushSincResamplerTest, ResampleInt) {
+  ResampleTest(true);
+}
+
+TEST_P(PushSincResamplerTest, ResampleFloat) {
+  ResampleTest(false);
+}
+
+// Thresholds chosen arbitrarily based on what each resampling reported during
+// testing.  All thresholds are in dbFS, http://en.wikipedia.org/wiki/DBFS.
+INSTANTIATE_TEST_SUITE_P(
+    PushSincResamplerTest,
+    PushSincResamplerTest,
+    ::testing::Values(
+        // First run through the rates tested in SincResamplerTest. The
+        // thresholds are identical.
+        //
+        // We don't directly test rates which fail to provide an integer number
+        // of samples in a 10 ms block (22050 and 11025 Hz), they are replaced
+        // by nearby rates in order to simplify testing.
+        //
+        // The PushSincResampler is in practice sample rate agnostic and derives
+        // resampling ratios from the block size, which for WebRTC purposes are
+        // blocks of floor(sample_rate/100) samples. So the 22050 Hz case is
+        // treated identically to the 22000 Hz case. Direct tests of 22050 Hz
+        // have to account for the simulated clock drift induced by the
+        // resampler inferring an incorrect sample rate ratio, without testing
+        // anything new within the resampler itself.
+
+        // To 22kHz
+        std::make_tuple(8000, 22000, kResamplingRMSError, -62.73),
+        std::make_tuple(11000, 22000, kResamplingRMSError, -74.17),
+        std::make_tuple(16000, 22000, kResamplingRMSError, -62.54),
+        std::make_tuple(22000, 22000, kResamplingRMSError, -73.53),
+        std::make_tuple(32000, 22000, kResamplingRMSError, -46.45),
+        std::make_tuple(44100, 22000, kResamplingRMSError, -28.34),
+        std::make_tuple(48000, 22000, -15.01, -25.56),
+        std::make_tuple(96000, 22000, -18.49, -13.30),
+        std::make_tuple(192000, 22000, -20.50, -9.20),
+
+        // To 44.1kHz
+        ::testing::make_tuple(8000, 44100, kResamplingRMSError, -62.73),
+        ::testing::make_tuple(11000, 44100, kResamplingRMSError, -63.57),
+        ::testing::make_tuple(16000, 44100, kResamplingRMSError, -62.54),
+        ::testing::make_tuple(22000, 44100, kResamplingRMSError, -62.73),
+        ::testing::make_tuple(32000, 44100, kResamplingRMSError, -63.32),
+        ::testing::make_tuple(44100, 44100, kResamplingRMSError, -73.53),
+        ::testing::make_tuple(48000, 44100, -15.01, -64.04),
+        ::testing::make_tuple(96000, 44100, -18.49, -25.51),
+        ::testing::make_tuple(192000, 44100, -20.50, -13.31),
+
+        // To 48kHz
+        ::testing::make_tuple(8000, 48000, kResamplingRMSError, -63.43),
+        ::testing::make_tuple(11000, 48000, kResamplingRMSError, -63.96),
+        ::testing::make_tuple(16000, 48000, kResamplingRMSError, -63.96),
+        ::testing::make_tuple(22000, 48000, kResamplingRMSError, -63.80),
+        ::testing::make_tuple(32000, 48000, kResamplingRMSError, -64.04),
+        ::testing::make_tuple(44100, 48000, kResamplingRMSError, -62.63),
+        ::testing::make_tuple(48000, 48000, kResamplingRMSError, -73.52),
+        ::testing::make_tuple(96000, 48000, -18.40, -28.44),
+        ::testing::make_tuple(192000, 48000, -20.43, -14.11),
+
+        // To 96kHz
+        ::testing::make_tuple(8000, 96000, kResamplingRMSError, -63.19),
+        ::testing::make_tuple(11000, 96000, kResamplingRMSError, -63.89),
+        ::testing::make_tuple(16000, 96000, kResamplingRMSError, -63.39),
+        ::testing::make_tuple(22000, 96000, kResamplingRMSError, -63.39),
+        ::testing::make_tuple(32000, 96000, kResamplingRMSError, -63.95),
+        ::testing::make_tuple(44100, 96000, kResamplingRMSError, -62.63),
+        ::testing::make_tuple(48000, 96000, kResamplingRMSError, -73.52),
+        ::testing::make_tuple(96000, 96000, kResamplingRMSError, -73.52),
+        ::testing::make_tuple(192000, 96000, kResamplingRMSError, -28.41),
+
+        // To 192kHz
+        ::testing::make_tuple(8000, 192000, kResamplingRMSError, -63.10),
+        ::testing::make_tuple(11000, 192000, kResamplingRMSError, -63.17),
+        ::testing::make_tuple(16000, 192000, kResamplingRMSError, -63.14),
+        ::testing::make_tuple(22000, 192000, kResamplingRMSError, -63.14),
+        ::testing::make_tuple(32000, 192000, kResamplingRMSError, -63.38),
+        ::testing::make_tuple(44100, 192000, kResamplingRMSError, -62.63),
+        ::testing::make_tuple(48000, 192000, kResamplingRMSError, -73.44),
+        ::testing::make_tuple(96000, 192000, kResamplingRMSError, -73.52),
+        ::testing::make_tuple(192000, 192000, kResamplingRMSError, -73.52),
+
+        // Next run through some additional cases interesting for WebRTC.
+        // We skip some extreme downsampled cases (192 -> {8, 16}, 96 -> 8)
+        // because they violate `kHighFrequencyMaxError`, which is not
+        // unexpected. It's very unlikely that we'll see these conversions in
+        // practice anyway.
+
+        // To 8 kHz
+        ::testing::make_tuple(8000, 8000, kResamplingRMSError, -75.50),
+        ::testing::make_tuple(16000, 8000, -18.56, -28.79),
+        ::testing::make_tuple(32000, 8000, -20.36, -14.13),
+        ::testing::make_tuple(44100, 8000, -21.00, -11.39),
+        ::testing::make_tuple(48000, 8000, -20.96, -11.04),
+
+        // To 16 kHz
+        ::testing::make_tuple(8000, 16000, kResamplingRMSError, -70.30),
+        ::testing::make_tuple(11000, 16000, kResamplingRMSError, -72.31),
+        ::testing::make_tuple(16000, 16000, kResamplingRMSError, -75.51),
+        ::testing::make_tuple(22000, 16000, kResamplingRMSError, -52.08),
+        ::testing::make_tuple(32000, 16000, -18.48, -28.59),
+        ::testing::make_tuple(44100, 16000, -19.30, -19.67),
+        ::testing::make_tuple(48000, 16000, -19.81, -18.11),
+        ::testing::make_tuple(96000, 16000, -20.95, -10.9596),
+
+        // To 32 kHz
+        ::testing::make_tuple(8000, 32000, kResamplingRMSError, -70.30),
+        ::testing::make_tuple(11000, 32000, kResamplingRMSError, -71.34),
+        ::testing::make_tuple(16000, 32000, kResamplingRMSError, -75.51),
+        ::testing::make_tuple(22000, 32000, kResamplingRMSError, -72.05),
+        ::testing::make_tuple(32000, 32000, kResamplingRMSError, -75.51),
+        ::testing::make_tuple(44100, 32000, -16.44, -51.0349),
+        ::testing::make_tuple(48000, 32000, -16.90, -43.9967),
+        ::testing::make_tuple(96000, 32000, -19.61, -18.04),
+        ::testing::make_tuple(192000, 32000, -21.02, -10.94)));
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/resampler.cc b/third_party/libwebrtc/common_audio/resampler/resampler.cc
new file mode 100644
index 0000000000..0fdb249052
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/resampler.cc
@@ -0,0 +1,923 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * A wrapper for resampling a numerous amount of sampling combinations.
+ */
+
+#include "common_audio/resampler/include/resampler.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+Resampler::Resampler()
+    : state1_(nullptr),
+      state2_(nullptr),
+      state3_(nullptr),
+      in_buffer_(nullptr),
+      out_buffer_(nullptr),
+      in_buffer_size_(0),
+      out_buffer_size_(0),
+      in_buffer_size_max_(0),
+      out_buffer_size_max_(0),
+      my_in_frequency_khz_(0),
+      my_out_frequency_khz_(0),
+      my_mode_(kResamplerMode1To1),
+      num_channels_(0),
+      helper_left_(nullptr),
+      helper_right_(nullptr) {}
+
+Resampler::Resampler(int inFreq, int outFreq, size_t num_channels)
+    : Resampler() {
+  Reset(inFreq, outFreq, num_channels);
+}
+
+Resampler::~Resampler() {
+  if (state1_) {
+    free(state1_);
+  }
+  if (state2_) {
+    free(state2_);
+  }
+  if (state3_) {
+    free(state3_);
+  }
+  if (in_buffer_) {
+    free(in_buffer_);
+  }
+  if (out_buffer_) {
+    free(out_buffer_);
+  }
+  if (helper_left_) {
+    delete helper_left_;
+  }
+  if (helper_right_) {
+    delete helper_right_;
+  }
+}
+
+int Resampler::ResetIfNeeded(int inFreq, int outFreq, size_t num_channels) {
+  int tmpInFreq_kHz = inFreq / 1000;
+  int tmpOutFreq_kHz = outFreq / 1000;
+
+  if ((tmpInFreq_kHz != my_in_frequency_khz_) ||
+      (tmpOutFreq_kHz != my_out_frequency_khz_) ||
+      (num_channels != num_channels_)) {
+    return Reset(inFreq, outFreq, num_channels);
+  } else {
+    return 0;
+  }
+}
+
+int Resampler::Reset(int inFreq, int outFreq, size_t num_channels) {
+  if (num_channels != 1 && num_channels != 2) {
+    RTC_LOG(LS_WARNING)
+        << "Reset() called with unsupported channel count, num_channels = "
+        << num_channels;
+    return -1;
+  }
+  ResamplerMode mode;
+  if (ComputeResamplerMode(inFreq, outFreq, &mode) != 0) {
+    RTC_LOG(LS_WARNING)
+        << "Reset() called with unsupported sample rates, inFreq = " << inFreq
+        << ", outFreq = " << outFreq;
+    return -1;
+  }
+  // Reinitialize internal state for the frequencies and sample rates.
+  num_channels_ = num_channels;
+  my_mode_ = mode;
+
+  if (state1_) {
+    free(state1_);
+    state1_ = nullptr;
+  }
+  if (state2_) {
+    free(state2_);
+    state2_ = nullptr;
+  }
+  if (state3_) {
+    free(state3_);
+    state3_ = nullptr;
+  }
+  if (in_buffer_) {
+    free(in_buffer_);
+    in_buffer_ = nullptr;
+  }
+  if (out_buffer_) {
+    free(out_buffer_);
+    out_buffer_ = nullptr;
+  }
+  if (helper_left_) {
+    delete helper_left_;
+    helper_left_ = nullptr;
+  }
+  if (helper_right_) {
+    delete helper_right_;
+    helper_right_ = nullptr;
+  }
+
+  in_buffer_size_ = 0;
+  out_buffer_size_ = 0;
+  in_buffer_size_max_ = 0;
+  out_buffer_size_max_ = 0;
+
+  // We need to track what domain we're in.
+  my_in_frequency_khz_ = inFreq / 1000;
+  my_out_frequency_khz_ = outFreq / 1000;
+
+  if (num_channels_ == 2) {
+    // Create two mono resamplers.
+    helper_left_ = new Resampler(inFreq, outFreq, 1);
+    helper_right_ = new Resampler(inFreq, outFreq, 1);
+  }
+
+  // Now create the states we need.
+  switch (my_mode_) {
+    case kResamplerMode1To1:
+      // No state needed;
+      break;
+    case kResamplerMode1To2:
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+      break;
+    case kResamplerMode1To3:
+      state1_ = malloc(sizeof(WebRtcSpl_State16khzTo48khz));
+      WebRtcSpl_ResetResample16khzTo48khz(
+          static_cast<WebRtcSpl_State16khzTo48khz*>(state1_));
+      break;
+    case kResamplerMode1To4:
+      // 1:2
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+      // 2:4
+      state2_ = malloc(8 * sizeof(int32_t));
+      memset(state2_, 0, 8 * sizeof(int32_t));
+      break;
+    case kResamplerMode1To6:
+      // 1:2
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+      // 2:6
+      state2_ = malloc(sizeof(WebRtcSpl_State16khzTo48khz));
+      WebRtcSpl_ResetResample16khzTo48khz(
+          static_cast<WebRtcSpl_State16khzTo48khz*>(state2_));
+      break;
+    case kResamplerMode1To12:
+      // 1:2
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+      // 2:4
+      state2_ = malloc(8 * sizeof(int32_t));
+      memset(state2_, 0, 8 * sizeof(int32_t));
+      // 4:12
+      state3_ = malloc(sizeof(WebRtcSpl_State16khzTo48khz));
+      WebRtcSpl_ResetResample16khzTo48khz(
+          static_cast<WebRtcSpl_State16khzTo48khz*>(state3_));
+      break;
+    case kResamplerMode2To3:
+      // 2:6
+      state1_ = malloc(sizeof(WebRtcSpl_State16khzTo48khz));
+      WebRtcSpl_ResetResample16khzTo48khz(
+          static_cast<WebRtcSpl_State16khzTo48khz*>(state1_));
+      // 6:3
+      state2_ = malloc(8 * sizeof(int32_t));
+      memset(state2_, 0, 8 * sizeof(int32_t));
+      break;
+    case kResamplerMode2To11:
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+
+      state2_ = malloc(sizeof(WebRtcSpl_State8khzTo22khz));
+      WebRtcSpl_ResetResample8khzTo22khz(
+          static_cast<WebRtcSpl_State8khzTo22khz*>(state2_));
+      break;
+    case kResamplerMode4To11:
+      state1_ = malloc(sizeof(WebRtcSpl_State8khzTo22khz));
+      WebRtcSpl_ResetResample8khzTo22khz(
+          static_cast<WebRtcSpl_State8khzTo22khz*>(state1_));
+      break;
+    case kResamplerMode8To11:
+      state1_ = malloc(sizeof(WebRtcSpl_State16khzTo22khz));
+      WebRtcSpl_ResetResample16khzTo22khz(
+          static_cast<WebRtcSpl_State16khzTo22khz*>(state1_));
+      break;
+    case kResamplerMode11To16:
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+
+      state2_ = malloc(sizeof(WebRtcSpl_State22khzTo16khz));
+      WebRtcSpl_ResetResample22khzTo16khz(
+          static_cast<WebRtcSpl_State22khzTo16khz*>(state2_));
+      break;
+    case kResamplerMode11To32:
+      // 11 -> 22
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+
+      // 22 -> 16
+      state2_ = malloc(sizeof(WebRtcSpl_State22khzTo16khz));
+      WebRtcSpl_ResetResample22khzTo16khz(
+          static_cast<WebRtcSpl_State22khzTo16khz*>(state2_));
+
+      // 16 -> 32
+      state3_ = malloc(8 * sizeof(int32_t));
+      memset(state3_, 0, 8 * sizeof(int32_t));
+
+      break;
+    case kResamplerMode2To1:
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+      break;
+    case kResamplerMode3To1:
+      state1_ = malloc(sizeof(WebRtcSpl_State48khzTo16khz));
+      WebRtcSpl_ResetResample48khzTo16khz(
+          static_cast<WebRtcSpl_State48khzTo16khz*>(state1_));
+      break;
+    case kResamplerMode4To1:
+      // 4:2
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+      // 2:1
+      state2_ = malloc(8 * sizeof(int32_t));
+      memset(state2_, 0, 8 * sizeof(int32_t));
+      break;
+    case kResamplerMode6To1:
+      // 6:2
+      state1_ = malloc(sizeof(WebRtcSpl_State48khzTo16khz));
+      WebRtcSpl_ResetResample48khzTo16khz(
+          static_cast<WebRtcSpl_State48khzTo16khz*>(state1_));
+      // 2:1
+      state2_ = malloc(8 * sizeof(int32_t));
+      memset(state2_, 0, 8 * sizeof(int32_t));
+      break;
+    case kResamplerMode12To1:
+      // 12:4
+      state1_ = malloc(sizeof(WebRtcSpl_State48khzTo16khz));
+      WebRtcSpl_ResetResample48khzTo16khz(
+          static_cast<WebRtcSpl_State48khzTo16khz*>(state1_));
+      // 4:2
+      state2_ = malloc(8 * sizeof(int32_t));
+      memset(state2_, 0, 8 * sizeof(int32_t));
+      // 2:1
+      state3_ = malloc(8 * sizeof(int32_t));
+      memset(state3_, 0, 8 * sizeof(int32_t));
+      break;
+    case kResamplerMode3To2:
+      // 3:6
+      state1_ = malloc(8 * sizeof(int32_t));
+      memset(state1_, 0, 8 * sizeof(int32_t));
+      // 6:2
+      state2_ = malloc(sizeof(WebRtcSpl_State48khzTo16khz));
+      WebRtcSpl_ResetResample48khzTo16khz(
+          static_cast<WebRtcSpl_State48khzTo16khz*>(state2_));
+      break;
+    case kResamplerMode11To2:
+      state1_ = malloc(sizeof(WebRtcSpl_State22khzTo8khz));
+      WebRtcSpl_ResetResample22khzTo8khz(
+          static_cast<WebRtcSpl_State22khzTo8khz*>(state1_));
+
+      state2_ = malloc(8 * sizeof(int32_t));
+      memset(state2_, 0, 8 * sizeof(int32_t));
+
+      break;
+    case kResamplerMode11To4:
+      state1_ = malloc(sizeof(WebRtcSpl_State22khzTo8khz));
+      WebRtcSpl_ResetResample22khzTo8khz(
+          static_cast<WebRtcSpl_State22khzTo8khz*>(state1_));
+      break;
+    case kResamplerMode11To8:
+      state1_ = malloc(sizeof(WebRtcSpl_State22khzTo16khz));
+      WebRtcSpl_ResetResample22khzTo16khz(
+          static_cast<WebRtcSpl_State22khzTo16khz*>(state1_));
+      break;
+  }
+
+  return 0;
+}
+
+int Resampler::ComputeResamplerMode(int in_freq_hz,
+                                    int out_freq_hz,
+                                    ResamplerMode* mode) {
+  // Start with a math exercise, Euclid's algorithm to find the gcd:
+  int a = in_freq_hz;
+  int b = out_freq_hz;
+  int c = a % b;
+  while (c != 0) {
+    a = b;
+    b = c;
+    c = a % b;
+  }
+  // b is now the gcd;
+
+  // Scale with GCD
+  const int reduced_in_freq = in_freq_hz / b;
+  const int reduced_out_freq = out_freq_hz / b;
+
+  if (reduced_in_freq == reduced_out_freq) {
+    *mode = kResamplerMode1To1;
+  } else if (reduced_in_freq == 1) {
+    switch (reduced_out_freq) {
+      case 2:
+        *mode = kResamplerMode1To2;
+        break;
+      case 3:
+        *mode = kResamplerMode1To3;
+        break;
+      case 4:
+        *mode = kResamplerMode1To4;
+        break;
+      case 6:
+        *mode = kResamplerMode1To6;
+        break;
+      case 12:
+        *mode = kResamplerMode1To12;
+        break;
+      default:
+        return -1;
+    }
+  } else if (reduced_out_freq == 1) {
+    switch (reduced_in_freq) {
+      case 2:
+        *mode = kResamplerMode2To1;
+        break;
+      case 3:
+        *mode = kResamplerMode3To1;
+        break;
+      case 4:
+        *mode = kResamplerMode4To1;
+        break;
+      case 6:
+        *mode = kResamplerMode6To1;
+        break;
+      case 12:
+        *mode = kResamplerMode12To1;
+        break;
+      default:
+        return -1;
+    }
+  } else if ((reduced_in_freq == 2) && (reduced_out_freq == 3)) {
+    *mode = kResamplerMode2To3;
+  } else if ((reduced_in_freq == 2) && (reduced_out_freq == 11)) {
+    *mode = kResamplerMode2To11;
+  } else if ((reduced_in_freq == 4) && (reduced_out_freq == 11)) {
+    *mode = kResamplerMode4To11;
+  } else if ((reduced_in_freq == 8) && (reduced_out_freq == 11)) {
+    *mode = kResamplerMode8To11;
+  } else if ((reduced_in_freq == 3) && (reduced_out_freq == 2)) {
+    *mode = kResamplerMode3To2;
+  } else if ((reduced_in_freq == 11) && (reduced_out_freq == 2)) {
+    *mode = kResamplerMode11To2;
+  } else if ((reduced_in_freq == 11) && (reduced_out_freq == 4)) {
+    *mode = kResamplerMode11To4;
+  } else if ((reduced_in_freq == 11) && (reduced_out_freq == 16)) {
+    *mode = kResamplerMode11To16;
+  } else if ((reduced_in_freq == 11) && (reduced_out_freq == 32)) {
+    *mode = kResamplerMode11To32;
+  } else if ((reduced_in_freq == 11) && (reduced_out_freq == 8)) {
+    *mode = kResamplerMode11To8;
+  } else {
+    return -1;
+  }
+  return 0;
+}
+
+// Synchronous resampling, all output samples are written to samplesOut
+int Resampler::Push(const int16_t* samplesIn,
+                    size_t lengthIn,
+                    int16_t* samplesOut,
+                    size_t maxLen,
+                    size_t& outLen) {
+  if (num_channels_ == 2) {
+    // Split up the signal and call the helper object for each channel
+    int16_t* left =
+        static_cast<int16_t*>(malloc(lengthIn * sizeof(int16_t) / 2));
+    int16_t* right =
+        static_cast<int16_t*>(malloc(lengthIn * sizeof(int16_t) / 2));
+    int16_t* out_left =
+        static_cast<int16_t*>(malloc(maxLen / 2 * sizeof(int16_t)));
+    int16_t* out_right =
+        static_cast<int16_t*>(malloc(maxLen / 2 * sizeof(int16_t)));
+    int res = 0;
+    for (size_t i = 0; i < lengthIn; i += 2) {
+      left[i >> 1] = samplesIn[i];
+      right[i >> 1] = samplesIn[i + 1];
+    }
+
+    // It's OK to overwrite the local parameter, since it's just a copy
+    lengthIn = lengthIn / 2;
+
+    size_t actualOutLen_left = 0;
+    size_t actualOutLen_right = 0;
+    // Do resampling for right channel
+    res |= helper_left_->Push(left, lengthIn, out_left, maxLen / 2,
+                              actualOutLen_left);
+    res |= helper_right_->Push(right, lengthIn, out_right, maxLen / 2,
+                               actualOutLen_right);
+    if (res || (actualOutLen_left != actualOutLen_right)) {
+      free(left);
+      free(right);
+      free(out_left);
+      free(out_right);
+      return -1;
+    }
+
+    // Reassemble the signal
+    for (size_t i = 0; i < actualOutLen_left; i++) {
+      samplesOut[i * 2] = out_left[i];
+      samplesOut[i * 2 + 1] = out_right[i];
+    }
+    outLen = 2 * actualOutLen_left;
+
+    free(left);
+    free(right);
+    free(out_left);
+    free(out_right);
+
+    return 0;
+  }
+
+  // Containers for temp samples
+  int16_t* tmp;
+  int16_t* tmp_2;
+  // tmp data for resampling routines
+  int32_t* tmp_mem;
+
+  switch (my_mode_) {
+    case kResamplerMode1To1:
+      memcpy(samplesOut, samplesIn, lengthIn * sizeof(int16_t));
+      outLen = lengthIn;
+      break;
+    case kResamplerMode1To2:
+      if (maxLen < (lengthIn * 2)) {
+        return -1;
+      }
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, samplesOut,
+                            static_cast<int32_t*>(state1_));
+      outLen = lengthIn * 2;
+      return 0;
+    case kResamplerMode1To3:
+
+      // We can only handle blocks of 160 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 160) != 0) {
+        return -1;
+      }
+      if (maxLen < (lengthIn * 3)) {
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(336 * sizeof(int32_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 160) {
+        WebRtcSpl_Resample16khzTo48khz(
+            samplesIn + i, samplesOut + i * 3,
+            static_cast<WebRtcSpl_State16khzTo48khz*>(state1_), tmp_mem);
+      }
+      outLen = lengthIn * 3;
+      free(tmp_mem);
+      return 0;
+    case kResamplerMode1To4:
+      if (maxLen < (lengthIn * 4)) {
+        return -1;
+      }
+
+      tmp = static_cast<int16_t*>(malloc(sizeof(int16_t) * 2 * lengthIn));
+      // 1:2
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, tmp,
+                            static_cast<int32_t*>(state1_));
+      // 2:4
+      WebRtcSpl_UpsampleBy2(tmp, lengthIn * 2, samplesOut,
+                            static_cast<int32_t*>(state2_));
+      outLen = lengthIn * 4;
+      free(tmp);
+      return 0;
+    case kResamplerMode1To6:
+      // We can only handle blocks of 80 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 80) != 0) {
+        return -1;
+      }
+      if (maxLen < (lengthIn * 6)) {
+        return -1;
+      }
+
+      // 1:2
+
+      tmp_mem = static_cast<int32_t*>(malloc(336 * sizeof(int32_t)));
+      tmp = static_cast<int16_t*>(malloc(sizeof(int16_t) * 2 * lengthIn));
+
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, tmp,
+                            static_cast<int32_t*>(state1_));
+      outLen = lengthIn * 2;
+
+      for (size_t i = 0; i < outLen; i += 160) {
+        WebRtcSpl_Resample16khzTo48khz(
+            tmp + i, samplesOut + i * 3,
+            static_cast<WebRtcSpl_State16khzTo48khz*>(state2_), tmp_mem);
+      }
+      outLen = outLen * 3;
+      free(tmp_mem);
+      free(tmp);
+
+      return 0;
+    case kResamplerMode1To12:
+      // We can only handle blocks of 40 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 40) != 0) {
+        return -1;
+      }
+      if (maxLen < (lengthIn * 12)) {
+        return -1;
+      }
+
+      tmp_mem = static_cast<int32_t*>(malloc(336 * sizeof(int32_t)));
+      tmp = static_cast<int16_t*>(malloc(sizeof(int16_t) * 4 * lengthIn));
+      // 1:2
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, samplesOut,
+                            static_cast<int32_t*>(state1_));
+      outLen = lengthIn * 2;
+      // 2:4
+      WebRtcSpl_UpsampleBy2(samplesOut, outLen, tmp,
+                            static_cast<int32_t*>(state2_));
+      outLen = outLen * 2;
+      // 4:12
+      for (size_t i = 0; i < outLen; i += 160) {
+        // WebRtcSpl_Resample16khzTo48khz() takes a block of 160 samples
+        // as input and outputs a resampled block of 480 samples. The
+        // data is now actually in 32 kHz sampling rate, despite the
+        // function name, and with a resampling factor of three becomes
+        // 96 kHz.
+        WebRtcSpl_Resample16khzTo48khz(
+            tmp + i, samplesOut + i * 3,
+            static_cast<WebRtcSpl_State16khzTo48khz*>(state3_), tmp_mem);
+      }
+      outLen = outLen * 3;
+      free(tmp_mem);
+      free(tmp);
+
+      return 0;
+    case kResamplerMode2To3:
+      if (maxLen < (lengthIn * 3 / 2)) {
+        return -1;
+      }
+      // 2:6
+      // We can only handle blocks of 160 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 160) != 0) {
+        return -1;
+      }
+      tmp = static_cast<int16_t*>(malloc(sizeof(int16_t) * lengthIn * 3));
+      tmp_mem = static_cast<int32_t*>(malloc(336 * sizeof(int32_t)));
+      for (size_t i = 0; i < lengthIn; i += 160) {
+        WebRtcSpl_Resample16khzTo48khz(
+            samplesIn + i, tmp + i * 3,
+            static_cast<WebRtcSpl_State16khzTo48khz*>(state1_), tmp_mem);
+      }
+      lengthIn = lengthIn * 3;
+      // 6:3
+      WebRtcSpl_DownsampleBy2(tmp, lengthIn, samplesOut,
+                              static_cast<int32_t*>(state2_));
+      outLen = lengthIn / 2;
+      free(tmp);
+      free(tmp_mem);
+      return 0;
+    case kResamplerMode2To11:
+
+      // We can only handle blocks of 80 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 80) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 11) / 2)) {
+        return -1;
+      }
+      tmp = static_cast<int16_t*>(malloc(sizeof(int16_t) * 2 * lengthIn));
+      // 1:2
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, tmp,
+                            static_cast<int32_t*>(state1_));
+      lengthIn *= 2;
+
+      tmp_mem = static_cast<int32_t*>(malloc(98 * sizeof(int32_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 80) {
+        WebRtcSpl_Resample8khzTo22khz(
+            tmp + i, samplesOut + (i * 11) / 4,
+            static_cast<WebRtcSpl_State8khzTo22khz*>(state2_), tmp_mem);
+      }
+      outLen = (lengthIn * 11) / 4;
+      free(tmp_mem);
+      free(tmp);
+      return 0;
+    case kResamplerMode4To11:
+
+      // We can only handle blocks of 80 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 80) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 11) / 4)) {
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(98 * sizeof(int32_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 80) {
+        WebRtcSpl_Resample8khzTo22khz(
+            samplesIn + i, samplesOut + (i * 11) / 4,
+            static_cast<WebRtcSpl_State8khzTo22khz*>(state1_), tmp_mem);
+      }
+      outLen = (lengthIn * 11) / 4;
+      free(tmp_mem);
+      return 0;
+    case kResamplerMode8To11:
+      // We can only handle blocks of 160 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 160) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 11) / 8)) {
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(88 * sizeof(int32_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 160) {
+        WebRtcSpl_Resample16khzTo22khz(
+            samplesIn + i, samplesOut + (i * 11) / 8,
+            static_cast<WebRtcSpl_State16khzTo22khz*>(state1_), tmp_mem);
+      }
+      outLen = (lengthIn * 11) / 8;
+      free(tmp_mem);
+      return 0;
+
+    case kResamplerMode11To16:
+      // We can only handle blocks of 110 samples
+      if ((lengthIn % 110) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 16) / 11)) {
+        return -1;
+      }
+
+      tmp_mem = static_cast<int32_t*>(malloc(104 * sizeof(int32_t)));
+      tmp = static_cast<int16_t*>(malloc((sizeof(int16_t) * lengthIn * 2)));
+
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, tmp,
+                            static_cast<int32_t*>(state1_));
+
+      for (size_t i = 0; i < (lengthIn * 2); i += 220) {
+        WebRtcSpl_Resample22khzTo16khz(
+            tmp + i, samplesOut + (i / 220) * 160,
+            static_cast<WebRtcSpl_State22khzTo16khz*>(state2_), tmp_mem);
+      }
+
+      outLen = (lengthIn * 16) / 11;
+
+      free(tmp_mem);
+      free(tmp);
+      return 0;
+
+    case kResamplerMode11To32:
+
+      // We can only handle blocks of 110 samples
+      if ((lengthIn % 110) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 32) / 11)) {
+        return -1;
+      }
+
+      tmp_mem = static_cast<int32_t*>(malloc(104 * sizeof(int32_t)));
+      tmp = static_cast<int16_t*>(malloc((sizeof(int16_t) * lengthIn * 2)));
+
+      // 11 -> 22 kHz in samplesOut
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, samplesOut,
+                            static_cast<int32_t*>(state1_));
+
+      // 22 -> 16 in tmp
+      for (size_t i = 0; i < (lengthIn * 2); i += 220) {
+        WebRtcSpl_Resample22khzTo16khz(
+            samplesOut + i, tmp + (i / 220) * 160,
+            static_cast<WebRtcSpl_State22khzTo16khz*>(state2_), tmp_mem);
+      }
+
+      // 16 -> 32 in samplesOut
+      WebRtcSpl_UpsampleBy2(tmp, (lengthIn * 16) / 11, samplesOut,
+                            static_cast<int32_t*>(state3_));
+
+      outLen = (lengthIn * 32) / 11;
+
+      free(tmp_mem);
+      free(tmp);
+      return 0;
+
+    case kResamplerMode2To1:
+      if (maxLen < (lengthIn / 2)) {
+        return -1;
+      }
+      WebRtcSpl_DownsampleBy2(samplesIn, lengthIn, samplesOut,
+                              static_cast<int32_t*>(state1_));
+      outLen = lengthIn / 2;
+      return 0;
+    case kResamplerMode3To1:
+      // We can only handle blocks of 480 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 480) != 0) {
+        return -1;
+      }
+      if (maxLen < (lengthIn / 3)) {
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(496 * sizeof(int32_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 480) {
+        WebRtcSpl_Resample48khzTo16khz(
+            samplesIn + i, samplesOut + i / 3,
+            static_cast<WebRtcSpl_State48khzTo16khz*>(state1_), tmp_mem);
+      }
+      outLen = lengthIn / 3;
+      free(tmp_mem);
+      return 0;
+    case kResamplerMode4To1:
+      if (maxLen < (lengthIn / 4)) {
+        return -1;
+      }
+      tmp = static_cast<int16_t*>(malloc(sizeof(int16_t) * lengthIn / 2));
+      // 4:2
+      WebRtcSpl_DownsampleBy2(samplesIn, lengthIn, tmp,
+                              static_cast<int32_t*>(state1_));
+      // 2:1
+      WebRtcSpl_DownsampleBy2(tmp, lengthIn / 2, samplesOut,
+                              static_cast<int32_t*>(state2_));
+      outLen = lengthIn / 4;
+      free(tmp);
+      return 0;
+
+    case kResamplerMode6To1:
+      // We can only handle blocks of 480 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 480) != 0) {
+        return -1;
+      }
+      if (maxLen < (lengthIn / 6)) {
+        return -1;
+      }
+
+      tmp_mem = static_cast<int32_t*>(malloc(496 * sizeof(int32_t)));
+      tmp = static_cast<int16_t*>(malloc((sizeof(int16_t) * lengthIn) / 3));
+
+      for (size_t i = 0; i < lengthIn; i += 480) {
+        WebRtcSpl_Resample48khzTo16khz(
+            samplesIn + i, tmp + i / 3,
+            static_cast<WebRtcSpl_State48khzTo16khz*>(state1_), tmp_mem);
+      }
+      outLen = lengthIn / 3;
+      free(tmp_mem);
+      WebRtcSpl_DownsampleBy2(tmp, outLen, samplesOut,
+                              static_cast<int32_t*>(state2_));
+      free(tmp);
+      outLen = outLen / 2;
+      return 0;
+    case kResamplerMode12To1:
+      // We can only handle blocks of 480 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 480) != 0) {
+        return -1;
+      }
+      if (maxLen < (lengthIn / 12)) {
+        return -1;
+      }
+
+      tmp_mem = static_cast<int32_t*>(malloc(496 * sizeof(int32_t)));
+      tmp = static_cast<int16_t*>(malloc((sizeof(int16_t) * lengthIn) / 3));
+      tmp_2 = static_cast<int16_t*>(malloc((sizeof(int16_t) * lengthIn) / 6));
+      // 12:4
+      for (size_t i = 0; i < lengthIn; i += 480) {
+        // WebRtcSpl_Resample48khzTo16khz() takes a block of 480 samples
+        // as input and outputs a resampled block of 160 samples. The
+        // data is now actually in 96 kHz sampling rate, despite the
+        // function name, and with a resampling factor of 1/3 becomes
+        // 32 kHz.
+        WebRtcSpl_Resample48khzTo16khz(
+            samplesIn + i, tmp + i / 3,
+            static_cast<WebRtcSpl_State48khzTo16khz*>(state1_), tmp_mem);
+      }
+      outLen = lengthIn / 3;
+      free(tmp_mem);
+      // 4:2
+      WebRtcSpl_DownsampleBy2(tmp, outLen, tmp_2,
+                              static_cast<int32_t*>(state2_));
+      outLen = outLen / 2;
+      free(tmp);
+      // 2:1
+      WebRtcSpl_DownsampleBy2(tmp_2, outLen, samplesOut,
+                              static_cast<int32_t*>(state3_));
+      free(tmp_2);
+      outLen = outLen / 2;
+      return 0;
+    case kResamplerMode3To2:
+      if (maxLen < (lengthIn * 2 / 3)) {
+        return -1;
+      }
+      // 3:6
+      tmp = static_cast<int16_t*>(malloc(sizeof(int16_t) * lengthIn * 2));
+      WebRtcSpl_UpsampleBy2(samplesIn, lengthIn, tmp,
+                            static_cast<int32_t*>(state1_));
+      lengthIn *= 2;
+      // 6:2
+      // We can only handle blocks of 480 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 480) != 0) {
+        free(tmp);
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(496 * sizeof(int32_t)));
+      for (size_t i = 0; i < lengthIn; i += 480) {
+        WebRtcSpl_Resample48khzTo16khz(
+            tmp + i, samplesOut + i / 3,
+            static_cast<WebRtcSpl_State48khzTo16khz*>(state2_), tmp_mem);
+      }
+      outLen = lengthIn / 3;
+      free(tmp);
+      free(tmp_mem);
+      return 0;
+    case kResamplerMode11To2:
+      // We can only handle blocks of 220 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 220) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 2) / 11)) {
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(126 * sizeof(int32_t)));
+      tmp =
+          static_cast<int16_t*>(malloc((lengthIn * 4) / 11 * sizeof(int16_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 220) {
+        WebRtcSpl_Resample22khzTo8khz(
+            samplesIn + i, tmp + (i * 4) / 11,
+            static_cast<WebRtcSpl_State22khzTo8khz*>(state1_), tmp_mem);
+      }
+      lengthIn = (lengthIn * 4) / 11;
+
+      WebRtcSpl_DownsampleBy2(tmp, lengthIn, samplesOut,
+                              static_cast<int32_t*>(state2_));
+      outLen = lengthIn / 2;
+
+      free(tmp_mem);
+      free(tmp);
+      return 0;
+    case kResamplerMode11To4:
+      // We can only handle blocks of 220 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 220) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 4) / 11)) {
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(126 * sizeof(int32_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 220) {
+        WebRtcSpl_Resample22khzTo8khz(
+            samplesIn + i, samplesOut + (i * 4) / 11,
+            static_cast<WebRtcSpl_State22khzTo8khz*>(state1_), tmp_mem);
+      }
+      outLen = (lengthIn * 4) / 11;
+      free(tmp_mem);
+      return 0;
+    case kResamplerMode11To8:
+      // We can only handle blocks of 160 samples
+      // Can be fixed, but I don't think it's needed
+      if ((lengthIn % 220) != 0) {
+        return -1;
+      }
+      if (maxLen < ((lengthIn * 8) / 11)) {
+        return -1;
+      }
+      tmp_mem = static_cast<int32_t*>(malloc(104 * sizeof(int32_t)));
+
+      for (size_t i = 0; i < lengthIn; i += 220) {
+        WebRtcSpl_Resample22khzTo16khz(
+            samplesIn + i, samplesOut + (i * 8) / 11,
+            static_cast<WebRtcSpl_State22khzTo16khz*>(state1_), tmp_mem);
+      }
+      outLen = (lengthIn * 8) / 11;
+      free(tmp_mem);
+      return 0;
+  }
+  return 0;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/resampler_unittest.cc b/third_party/libwebrtc/common_audio/resampler/resampler_unittest.cc
new file mode 100644
index 0000000000..1b90d3e30b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/resampler_unittest.cc
@@ -0,0 +1,168 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/resampler/include/resampler.h"
+
+#include <array>
+
+#include "rtc_base/strings/string_builder.h"
+#include "test/gtest.h"
+
+// TODO(andrew): this is a work-in-progress. Many more tests are needed.
+
+namespace webrtc {
+namespace {
+
+const int kNumChannels[] = {1, 2};
+const size_t kNumChannelsSize = sizeof(kNumChannels) / sizeof(*kNumChannels);
+
+// Rates we must support.
+const int kMaxRate = 96000;
+const int kRates[] = {8000, 16000, 32000, 44000, 48000, kMaxRate};
+const size_t kRatesSize = sizeof(kRates) / sizeof(*kRates);
+const int kMaxChannels = 2;
+const size_t kDataSize = static_cast<size_t>(kMaxChannels * kMaxRate / 100);
+
+// TODO(andrew): should we be supporting these combinations?
+bool ValidRates(int in_rate, int out_rate) {
+  // Not the most compact notation, for clarity.
+  if ((in_rate == 44000 && (out_rate == 48000 || out_rate == 96000)) ||
+      (out_rate == 44000 && (in_rate == 48000 || in_rate == 96000))) {
+    return false;
+  }
+
+  return true;
+}
+
+class ResamplerTest : public ::testing::Test {
+ protected:
+  ResamplerTest();
+  void SetUp() override;
+  void TearDown() override;
+
+  void ResetIfNeededAndPush(int in_rate, int out_rate, int num_channels);
+
+  Resampler rs_;
+  int16_t data_in_[kDataSize];
+  int16_t data_out_[kDataSize];
+};
+
+ResamplerTest::ResamplerTest() {}
+
+void ResamplerTest::SetUp() {
+  // Initialize input data with anything. The tests are content independent.
+  memset(data_in_, 1, sizeof(data_in_));
+}
+
+void ResamplerTest::TearDown() {}
+
+void ResamplerTest::ResetIfNeededAndPush(int in_rate,
+                                         int out_rate,
+                                         int num_channels) {
+  rtc::StringBuilder ss;
+  ss << "Input rate: " << in_rate << ", output rate: " << out_rate
+     << ", channel count: " << num_channels;
+  SCOPED_TRACE(ss.str());
+
+  if (ValidRates(in_rate, out_rate)) {
+    size_t in_length = static_cast<size_t>(in_rate / 100);
+    size_t out_length = 0;
+    EXPECT_EQ(0, rs_.ResetIfNeeded(in_rate, out_rate, num_channels));
+    EXPECT_EQ(0,
+              rs_.Push(data_in_, in_length, data_out_, kDataSize, out_length));
+    EXPECT_EQ(static_cast<size_t>(out_rate / 100), out_length);
+  } else {
+    EXPECT_EQ(-1, rs_.ResetIfNeeded(in_rate, out_rate, num_channels));
+  }
+}
+
+TEST_F(ResamplerTest, Reset) {
+  // The only failure mode for the constructor is if Reset() fails. For the
+  // time being then (until an Init function is added), we rely on Reset()
+  // to test the constructor.
+
+  // Check that all required combinations are supported.
+  for (size_t i = 0; i < kRatesSize; ++i) {
+    for (size_t j = 0; j < kRatesSize; ++j) {
+      for (size_t k = 0; k < kNumChannelsSize; ++k) {
+        rtc::StringBuilder ss;
+        ss << "Input rate: " << kRates[i] << ", output rate: " << kRates[j]
+           << ", channels: " << kNumChannels[k];
+        SCOPED_TRACE(ss.str());
+        if (ValidRates(kRates[i], kRates[j]))
+          EXPECT_EQ(0, rs_.Reset(kRates[i], kRates[j], kNumChannels[k]));
+        else
+          EXPECT_EQ(-1, rs_.Reset(kRates[i], kRates[j], kNumChannels[k]));
+      }
+    }
+  }
+}
+
+// TODO(tlegrand): Replace code inside the two tests below with a function
+// with number of channels and ResamplerType as input.
+TEST_F(ResamplerTest, Mono) {
+  const int kChannels = 1;
+  for (size_t i = 0; i < kRatesSize; ++i) {
+    for (size_t j = 0; j < kRatesSize; ++j) {
+      rtc::StringBuilder ss;
+      ss << "Input rate: " << kRates[i] << ", output rate: " << kRates[j];
+      SCOPED_TRACE(ss.str());
+
+      if (ValidRates(kRates[i], kRates[j])) {
+        size_t in_length = static_cast<size_t>(kRates[i] / 100);
+        size_t out_length = 0;
+        EXPECT_EQ(0, rs_.Reset(kRates[i], kRates[j], kChannels));
+        EXPECT_EQ(
+            0, rs_.Push(data_in_, in_length, data_out_, kDataSize, out_length));
+        EXPECT_EQ(static_cast<size_t>(kRates[j] / 100), out_length);
+      } else {
+        EXPECT_EQ(-1, rs_.Reset(kRates[i], kRates[j], kChannels));
+      }
+    }
+  }
+}
+
+TEST_F(ResamplerTest, Stereo) {
+  const int kChannels = 2;
+  for (size_t i = 0; i < kRatesSize; ++i) {
+    for (size_t j = 0; j < kRatesSize; ++j) {
+      rtc::StringBuilder ss;
+      ss << "Input rate: " << kRates[i] << ", output rate: " << kRates[j];
+      SCOPED_TRACE(ss.str());
+
+      if (ValidRates(kRates[i], kRates[j])) {
+        size_t in_length = static_cast<size_t>(kChannels * kRates[i] / 100);
+        size_t out_length = 0;
+        EXPECT_EQ(0, rs_.Reset(kRates[i], kRates[j], kChannels));
+        EXPECT_EQ(
+            0, rs_.Push(data_in_, in_length, data_out_, kDataSize, out_length));
+        EXPECT_EQ(static_cast<size_t>(kChannels * kRates[j] / 100), out_length);
+      } else {
+        EXPECT_EQ(-1, rs_.Reset(kRates[i], kRates[j], kChannels));
+      }
+    }
+  }
+}
+
+// Try multiple resets between a few supported and unsupported rates.
+TEST_F(ResamplerTest, MultipleResets) {
+  constexpr size_t kNumChanges = 5;
+  constexpr std::array<int, kNumChanges> kInRates = {
+      {8000, 44000, 44000, 32000, 32000}};
+  constexpr std::array<int, kNumChanges> kOutRates = {
+      {16000, 48000, 48000, 16000, 16000}};
+  constexpr std::array<int, kNumChanges> kNumChannels = {{2, 2, 2, 2, 1}};
+  for (size_t i = 0; i < kNumChanges; ++i) {
+    ResetIfNeededAndPush(kInRates[i], kOutRates[i], kNumChannels[i]);
+  }
+}
+
+}  // namespace
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/sinc_resampler.cc b/third_party/libwebrtc/common_audio/resampler/sinc_resampler.cc
new file mode 100644
index 0000000000..66a99b6190
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinc_resampler.cc
@@ -0,0 +1,366 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Modified from the Chromium original:
+// src/media/base/sinc_resampler.cc
+
+// Initial input buffer layout, dividing into regions r0_ to r4_ (note: r0_, r3_
+// and r4_ will move after the first load):
+//
+// |----------------|-----------------------------------------|----------------|
+//
+//                                        request_frames_
+//                   <--------------------------------------------------------->
+//                                    r0_ (during first load)
+//
+//  kKernelSize / 2   kKernelSize / 2         kKernelSize / 2   kKernelSize / 2
+// <---------------> <--------------->       <---------------> <--------------->
+//        r1_               r2_                     r3_               r4_
+//
+//                             block_size_ == r4_ - r2_
+//                   <--------------------------------------->
+//
+//                                                  request_frames_
+//                                    <------------------ ... ----------------->
+//                                               r0_ (during second load)
+//
+// On the second request r0_ slides to the right by kKernelSize / 2 and r3_, r4_
+// and block_size_ are reinitialized via step (3) in the algorithm below.
+//
+// These new regions remain constant until a Flush() occurs.  While complicated,
+// this allows us to reduce jitter by always requesting the same amount from the
+// provided callback.
+//
+// The algorithm:
+//
+// 1) Allocate input_buffer of size: request_frames_ + kKernelSize; this ensures
+//    there's enough room to read request_frames_ from the callback into region
+//    r0_ (which will move between the first and subsequent passes).
+//
+// 2) Let r1_, r2_ each represent half the kernel centered around r0_:
+//
+//        r0_ = input_buffer_ + kKernelSize / 2
+//        r1_ = input_buffer_
+//        r2_ = r0_
+//
+//    r0_ is always request_frames_ in size.  r1_, r2_ are kKernelSize / 2 in
+//    size.  r1_ must be zero initialized to avoid convolution with garbage (see
+//    step (5) for why).
+//
+// 3) Let r3_, r4_ each represent half the kernel right aligned with the end of
+//    r0_ and choose block_size_ as the distance in frames between r4_ and r2_:
+//
+//        r3_ = r0_ + request_frames_ - kKernelSize
+//        r4_ = r0_ + request_frames_ - kKernelSize / 2
+//        block_size_ = r4_ - r2_ = request_frames_ - kKernelSize / 2
+//
+// 4) Consume request_frames_ frames into r0_.
+//
+// 5) Position kernel centered at start of r2_ and generate output frames until
+//    the kernel is centered at the start of r4_ or we've finished generating
+//    all the output frames.
+//
+// 6) Wrap left over data from the r3_ to r1_ and r4_ to r2_.
+//
+// 7) If we're on the second load, in order to avoid overwriting the frames we
+//    just wrapped from r4_ we need to slide r0_ to the right by the size of
+//    r4_, which is kKernelSize / 2:
+//
+//        r0_ = r0_ + kKernelSize / 2 = input_buffer_ + kKernelSize
+//
+//    r3_, r4_, and block_size_ then need to be reinitialized, so goto (3).
+//
+// 8) Else, if we're not on the second load, goto (4).
+//
+// Note: we're glossing over how the sub-sample handling works with
+// `virtual_source_idx_`, etc.
+
+// MSVC++ requires this to be set before any other includes to get M_PI.
+#define _USE_MATH_DEFINES
+
+#include "common_audio/resampler/sinc_resampler.h"
+
+#include <math.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <limits>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/system/arch.h"
+#include "system_wrappers/include/cpu_features_wrapper.h"  // kSSE2, WebRtc_G...
+
+namespace webrtc {
+
+namespace {
+
+double SincScaleFactor(double io_ratio) {
+  // `sinc_scale_factor` is basically the normalized cutoff frequency of the
+  // low-pass filter.
+  double sinc_scale_factor = io_ratio > 1.0 ? 1.0 / io_ratio : 1.0;
+
+  // The sinc function is an idealized brick-wall filter, but since we're
+  // windowing it the transition from pass to stop does not happen right away.
+  // So we should adjust the low pass filter cutoff slightly downward to avoid
+  // some aliasing at the very high-end.
+  // TODO(crogers): this value is empirical and to be more exact should vary
+  // depending on kKernelSize.
+  sinc_scale_factor *= 0.9;
+
+  return sinc_scale_factor;
+}
+
+}  // namespace
+
+const size_t SincResampler::kKernelSize;
+
+// If we know the minimum architecture at compile time, avoid CPU detection.
+void SincResampler::InitializeCPUSpecificFeatures() {
+#if defined(WEBRTC_HAS_NEON)
+  convolve_proc_ = Convolve_NEON;
+#elif defined(WEBRTC_ARCH_X86_FAMILY)
+  // Using AVX2 instead of SSE2 when AVX2/FMA3 supported.
+  if (GetCPUInfo(kAVX2) && GetCPUInfo(kFMA3))
+    convolve_proc_ = Convolve_AVX2;
+  else if (GetCPUInfo(kSSE2))
+    convolve_proc_ = Convolve_SSE;
+  else
+    convolve_proc_ = Convolve_C;
+#else
+  // Unknown architecture.
+  convolve_proc_ = Convolve_C;
+#endif
+}
+
+SincResampler::SincResampler(double io_sample_rate_ratio,
+                             size_t request_frames,
+                             SincResamplerCallback* read_cb)
+    : io_sample_rate_ratio_(io_sample_rate_ratio),
+      read_cb_(read_cb),
+      request_frames_(request_frames),
+      input_buffer_size_(request_frames_ + kKernelSize),
+      // Create input buffers with a 32-byte alignment for SIMD optimizations.
+      kernel_storage_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * kKernelStorageSize, 32))),
+      kernel_pre_sinc_storage_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * kKernelStorageSize, 32))),
+      kernel_window_storage_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * kKernelStorageSize, 32))),
+      input_buffer_(static_cast<float*>(
+          AlignedMalloc(sizeof(float) * input_buffer_size_, 32))),
+      convolve_proc_(nullptr),
+      r1_(input_buffer_.get()),
+      r2_(input_buffer_.get() + kKernelSize / 2) {
+  InitializeCPUSpecificFeatures();
+  RTC_DCHECK(convolve_proc_);
+  RTC_DCHECK_GT(request_frames_, 0);
+  Flush();
+  RTC_DCHECK_GT(block_size_, kKernelSize);
+
+  memset(kernel_storage_.get(), 0,
+         sizeof(*kernel_storage_.get()) * kKernelStorageSize);
+  memset(kernel_pre_sinc_storage_.get(), 0,
+         sizeof(*kernel_pre_sinc_storage_.get()) * kKernelStorageSize);
+  memset(kernel_window_storage_.get(), 0,
+         sizeof(*kernel_window_storage_.get()) * kKernelStorageSize);
+
+  InitializeKernel();
+}
+
+SincResampler::~SincResampler() {}
+
+void SincResampler::UpdateRegions(bool second_load) {
+  // Setup various region pointers in the buffer (see diagram above).  If we're
+  // on the second load we need to slide r0_ to the right by kKernelSize / 2.
+  r0_ = input_buffer_.get() + (second_load ? kKernelSize : kKernelSize / 2);
+  r3_ = r0_ + request_frames_ - kKernelSize;
+  r4_ = r0_ + request_frames_ - kKernelSize / 2;
+  block_size_ = r4_ - r2_;
+
+  // r1_ at the beginning of the buffer.
+  RTC_DCHECK_EQ(r1_, input_buffer_.get());
+  // r1_ left of r2_, r4_ left of r3_ and size correct.
+  RTC_DCHECK_EQ(r2_ - r1_, r4_ - r3_);
+  // r2_ left of r3.
+  RTC_DCHECK_LT(r2_, r3_);
+}
+
+void SincResampler::InitializeKernel() {
+  // Blackman window parameters.
+  static const double kAlpha = 0.16;
+  static const double kA0 = 0.5 * (1.0 - kAlpha);
+  static const double kA1 = 0.5;
+  static const double kA2 = 0.5 * kAlpha;
+
+  // Generates a set of windowed sinc() kernels.
+  // We generate a range of sub-sample offsets from 0.0 to 1.0.
+  const double sinc_scale_factor = SincScaleFactor(io_sample_rate_ratio_);
+  for (size_t offset_idx = 0; offset_idx <= kKernelOffsetCount; ++offset_idx) {
+    const float subsample_offset =
+        static_cast<float>(offset_idx) / kKernelOffsetCount;
+
+    for (size_t i = 0; i < kKernelSize; ++i) {
+      const size_t idx = i + offset_idx * kKernelSize;
+      const float pre_sinc = static_cast<float>(
+          M_PI * (static_cast<int>(i) - static_cast<int>(kKernelSize / 2) -
+                  subsample_offset));
+      kernel_pre_sinc_storage_[idx] = pre_sinc;
+
+      // Compute Blackman window, matching the offset of the sinc().
+      const float x = (i - subsample_offset) / kKernelSize;
+      const float window = static_cast<float>(kA0 - kA1 * cos(2.0 * M_PI * x) +
+                                              kA2 * cos(4.0 * M_PI * x));
+      kernel_window_storage_[idx] = window;
+
+      // Compute the sinc with offset, then window the sinc() function and store
+      // at the correct offset.
+      kernel_storage_[idx] = static_cast<float>(
+          window * ((pre_sinc == 0)
+                        ? sinc_scale_factor
+                        : (sin(sinc_scale_factor * pre_sinc) / pre_sinc)));
+    }
+  }
+}
+
+void SincResampler::SetRatio(double io_sample_rate_ratio) {
+  if (fabs(io_sample_rate_ratio_ - io_sample_rate_ratio) <
+      std::numeric_limits<double>::epsilon()) {
+    return;
+  }
+
+  io_sample_rate_ratio_ = io_sample_rate_ratio;
+
+  // Optimize reinitialization by reusing values which are independent of
+  // `sinc_scale_factor`.  Provides a 3x speedup.
+  const double sinc_scale_factor = SincScaleFactor(io_sample_rate_ratio_);
+  for (size_t offset_idx = 0; offset_idx <= kKernelOffsetCount; ++offset_idx) {
+    for (size_t i = 0; i < kKernelSize; ++i) {
+      const size_t idx = i + offset_idx * kKernelSize;
+      const float window = kernel_window_storage_[idx];
+      const float pre_sinc = kernel_pre_sinc_storage_[idx];
+
+      kernel_storage_[idx] = static_cast<float>(
+          window * ((pre_sinc == 0)
+                        ? sinc_scale_factor
+                        : (sin(sinc_scale_factor * pre_sinc) / pre_sinc)));
+    }
+  }
+}
+
+void SincResampler::Resample(size_t frames, float* destination) {
+  size_t remaining_frames = frames;
+
+  // Step (1) -- Prime the input buffer at the start of the input stream.
+  if (!buffer_primed_ && remaining_frames) {
+    read_cb_->Run(request_frames_, r0_);
+    buffer_primed_ = true;
+  }
+
+  // Step (2) -- Resample!  const what we can outside of the loop for speed.  It
+  // actually has an impact on ARM performance.  See inner loop comment below.
+  const double current_io_ratio = io_sample_rate_ratio_;
+  const float* const kernel_ptr = kernel_storage_.get();
+  while (remaining_frames) {
+    // `i` may be negative if the last Resample() call ended on an iteration
+    // that put `virtual_source_idx_` over the limit.
+    //
+    // Note: The loop construct here can severely impact performance on ARM
+    // or when built with clang.  See https://codereview.chromium.org/18566009/
+    for (int i = static_cast<int>(
+             ceil((block_size_ - virtual_source_idx_) / current_io_ratio));
+         i > 0; --i) {
+      RTC_DCHECK_LT(virtual_source_idx_, block_size_);
+
+      // `virtual_source_idx_` lies in between two kernel offsets so figure out
+      // what they are.
+      const int source_idx = static_cast<int>(virtual_source_idx_);
+      const double subsample_remainder = virtual_source_idx_ - source_idx;
+
+      const double virtual_offset_idx =
+          subsample_remainder * kKernelOffsetCount;
+      const int offset_idx = static_cast<int>(virtual_offset_idx);
+
+      // We'll compute "convolutions" for the two kernels which straddle
+      // `virtual_source_idx_`.
+      const float* const k1 = kernel_ptr + offset_idx * kKernelSize;
+      const float* const k2 = k1 + kKernelSize;
+
+      // Ensure `k1`, `k2` are 32-byte aligned for SIMD usage.  Should always be
+      // true so long as kKernelSize is a multiple of 32.
+      RTC_DCHECK_EQ(0, reinterpret_cast<uintptr_t>(k1) % 32);
+      RTC_DCHECK_EQ(0, reinterpret_cast<uintptr_t>(k2) % 32);
+
+      // Initialize input pointer based on quantized `virtual_source_idx_`.
+      const float* const input_ptr = r1_ + source_idx;
+
+      // Figure out how much to weight each kernel's "convolution".
+      const double kernel_interpolation_factor =
+          virtual_offset_idx - offset_idx;
+      *destination++ =
+          convolve_proc_(input_ptr, k1, k2, kernel_interpolation_factor);
+
+      // Advance the virtual index.
+      virtual_source_idx_ += current_io_ratio;
+
+      if (!--remaining_frames)
+        return;
+    }
+
+    // Wrap back around to the start.
+    virtual_source_idx_ -= block_size_;
+
+    // Step (3) -- Copy r3_, r4_ to r1_, r2_.
+    // This wraps the last input frames back to the start of the buffer.
+    memcpy(r1_, r3_, sizeof(*input_buffer_.get()) * kKernelSize);
+
+    // Step (4) -- Reinitialize regions if necessary.
+    if (r0_ == r2_)
+      UpdateRegions(true);
+
+    // Step (5) -- Refresh the buffer with more input.
+    read_cb_->Run(request_frames_, r0_);
+  }
+}
+
+#undef CONVOLVE_FUNC
+
+size_t SincResampler::ChunkSize() const {
+  return static_cast<size_t>(block_size_ / io_sample_rate_ratio_);
+}
+
+void SincResampler::Flush() {
+  virtual_source_idx_ = 0;
+  buffer_primed_ = false;
+  memset(input_buffer_.get(), 0,
+         sizeof(*input_buffer_.get()) * input_buffer_size_);
+  UpdateRegions(false);
+}
+
+float SincResampler::Convolve_C(const float* input_ptr,
+                                const float* k1,
+                                const float* k2,
+                                double kernel_interpolation_factor) {
+  float sum1 = 0;
+  float sum2 = 0;
+
+  // Generate a single output sample.  Unrolling this loop hurt performance in
+  // local testing.
+  size_t n = kKernelSize;
+  while (n--) {
+    sum1 += *input_ptr * *k1++;
+    sum2 += *input_ptr++ * *k2++;
+  }
+
+  // Linearly interpolate the two "convolutions".
+  return static_cast<float>((1.0 - kernel_interpolation_factor) * sum1 +
+                            kernel_interpolation_factor * sum2);
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/sinc_resampler.h b/third_party/libwebrtc/common_audio/resampler/sinc_resampler.h
new file mode 100644
index 0000000000..c6a43abd01
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinc_resampler.h
@@ -0,0 +1,181 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Modified from the Chromium original here:
+// src/media/base/sinc_resampler.h
+
+#ifndef COMMON_AUDIO_RESAMPLER_SINC_RESAMPLER_H_
+#define COMMON_AUDIO_RESAMPLER_SINC_RESAMPLER_H_
+
+#include <stddef.h>
+
+#include <memory>
+
+#include "rtc_base/gtest_prod_util.h"
+#include "rtc_base/memory/aligned_malloc.h"
+#include "rtc_base/system/arch.h"
+
+namespace webrtc {
+
+// Callback class for providing more data into the resampler.  Expects `frames`
+// of data to be rendered into `destination`; zero padded if not enough frames
+// are available to satisfy the request.
+class SincResamplerCallback {
+ public:
+  virtual ~SincResamplerCallback() {}
+  virtual void Run(size_t frames, float* destination) = 0;
+};
+
+// SincResampler is a high-quality single-channel sample-rate converter.
+class SincResampler {
+ public:
+  // The kernel size can be adjusted for quality (higher is better) at the
+  // expense of performance.  Must be a multiple of 32.
+  // TODO(dalecurtis): Test performance to see if we can jack this up to 64+.
+  static const size_t kKernelSize = 32;
+
+  // Default request size.  Affects how often and for how much SincResampler
+  // calls back for input.  Must be greater than kKernelSize.
+  static const size_t kDefaultRequestSize = 512;
+
+  // The kernel offset count is used for interpolation and is the number of
+  // sub-sample kernel shifts.  Can be adjusted for quality (higher is better)
+  // at the expense of allocating more memory.
+  static const size_t kKernelOffsetCount = 32;
+  static const size_t kKernelStorageSize =
+      kKernelSize * (kKernelOffsetCount + 1);
+
+  // Constructs a SincResampler with the specified `read_cb`, which is used to
+  // acquire audio data for resampling.  `io_sample_rate_ratio` is the ratio
+  // of input / output sample rates.  `request_frames` controls the size in
+  // frames of the buffer requested by each `read_cb` call.  The value must be
+  // greater than kKernelSize.  Specify kDefaultRequestSize if there are no
+  // request size constraints.
+  SincResampler(double io_sample_rate_ratio,
+                size_t request_frames,
+                SincResamplerCallback* read_cb);
+  virtual ~SincResampler();
+
+  SincResampler(const SincResampler&) = delete;
+  SincResampler& operator=(const SincResampler&) = delete;
+
+  // Resample `frames` of data from `read_cb_` into `destination`.
+  void Resample(size_t frames, float* destination);
+
+  // The maximum size in frames that guarantees Resample() will only make a
+  // single call to `read_cb_` for more data.
+  size_t ChunkSize() const;
+
+  size_t request_frames() const { return request_frames_; }
+
+  // Flush all buffered data and reset internal indices.  Not thread safe, do
+  // not call while Resample() is in progress.
+  void Flush();
+
+  // Update `io_sample_rate_ratio_`.  SetRatio() will cause a reconstruction of
+  // the kernels used for resampling.  Not thread safe, do not call while
+  // Resample() is in progress.
+  //
+  // TODO(ajm): Use this in PushSincResampler rather than reconstructing
+  // SincResampler.  We would also need a way to update `request_frames_`.
+  void SetRatio(double io_sample_rate_ratio);
+
+  float* get_kernel_for_testing() { return kernel_storage_.get(); }
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(SincResamplerTest, Convolve);
+  FRIEND_TEST_ALL_PREFIXES(SincResamplerTest, ConvolveBenchmark);
+
+  void InitializeKernel();
+  void UpdateRegions(bool second_load);
+
+  // Selects runtime specific CPU features like SSE.  Must be called before
+  // using SincResampler.
+  // TODO(ajm): Currently managed by the class internally. See the note with
+  // `convolve_proc_` below.
+  void InitializeCPUSpecificFeatures();
+
+  // Compute convolution of `k1` and `k2` over `input_ptr`, resultant sums are
+  // linearly interpolated using `kernel_interpolation_factor`.  On x86 and ARM
+  // the underlying implementation is chosen at run time.
+  static float Convolve_C(const float* input_ptr,
+                          const float* k1,
+                          const float* k2,
+                          double kernel_interpolation_factor);
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+  static float Convolve_SSE(const float* input_ptr,
+                            const float* k1,
+                            const float* k2,
+                            double kernel_interpolation_factor);
+  static float Convolve_AVX2(const float* input_ptr,
+                             const float* k1,
+                             const float* k2,
+                             double kernel_interpolation_factor);
+#elif defined(WEBRTC_HAS_NEON)
+  static float Convolve_NEON(const float* input_ptr,
+                             const float* k1,
+                             const float* k2,
+                             double kernel_interpolation_factor);
+#endif
+
+  // The ratio of input / output sample rates.
+  double io_sample_rate_ratio_;
+
+  // An index on the source input buffer with sub-sample precision.  It must be
+  // double precision to avoid drift.
+  double virtual_source_idx_;
+
+  // The buffer is primed once at the very beginning of processing.
+  bool buffer_primed_;
+
+  // Source of data for resampling.
+  SincResamplerCallback* read_cb_;
+
+  // The size (in samples) to request from each `read_cb_` execution.
+  const size_t request_frames_;
+
+  // The number of source frames processed per pass.
+  size_t block_size_;
+
+  // The size (in samples) of the internal buffer used by the resampler.
+  const size_t input_buffer_size_;
+
+  // Contains kKernelOffsetCount kernels back-to-back, each of size kKernelSize.
+  // The kernel offsets are sub-sample shifts of a windowed sinc shifted from
+  // 0.0 to 1.0 sample.
+  std::unique_ptr<float[], AlignedFreeDeleter> kernel_storage_;
+  std::unique_ptr<float[], AlignedFreeDeleter> kernel_pre_sinc_storage_;
+  std::unique_ptr<float[], AlignedFreeDeleter> kernel_window_storage_;
+
+  // Data from the source is copied into this buffer for each processing pass.
+  std::unique_ptr<float[], AlignedFreeDeleter> input_buffer_;
+
+  // Stores the runtime selection of which Convolve function to use.
+  // TODO(ajm): Move to using a global static which must only be initialized
+  // once by the user. We're not doing this initially, because we don't have
+  // e.g. a LazyInstance helper in webrtc.
+  typedef float (*ConvolveProc)(const float*,
+                                const float*,
+                                const float*,
+                                double);
+  ConvolveProc convolve_proc_;
+
+  // Pointers to the various regions inside `input_buffer_`.  See the diagram at
+  // the top of the .cc file for more information.
+  float* r0_;
+  float* const r1_;
+  float* const r2_;
+  float* r3_;
+  float* r4_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_RESAMPLER_SINC_RESAMPLER_H_
diff --git a/third_party/libwebrtc/common_audio/resampler/sinc_resampler_avx2.cc b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_avx2.cc
new file mode 100644
index 0000000000..d945a10be2
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_avx2.cc
@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <immintrin.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <xmmintrin.h>
+
+#include "common_audio/resampler/sinc_resampler.h"
+
+namespace webrtc {
+
+float SincResampler::Convolve_AVX2(const float* input_ptr,
+                                   const float* k1,
+                                   const float* k2,
+                                   double kernel_interpolation_factor) {
+  __m256 m_input;
+  __m256 m_sums1 = _mm256_setzero_ps();
+  __m256 m_sums2 = _mm256_setzero_ps();
+
+  // Based on `input_ptr` alignment, we need to use loadu or load.  Unrolling
+  // these loops has not been tested or benchmarked.
+  bool aligned_input = (reinterpret_cast<uintptr_t>(input_ptr) & 0x1F) == 0;
+  if (!aligned_input) {
+    for (size_t i = 0; i < kKernelSize; i += 8) {
+      m_input = _mm256_loadu_ps(input_ptr + i);
+      m_sums1 = _mm256_fmadd_ps(m_input, _mm256_load_ps(k1 + i), m_sums1);
+      m_sums2 = _mm256_fmadd_ps(m_input, _mm256_load_ps(k2 + i), m_sums2);
+    }
+  } else {
+    for (size_t i = 0; i < kKernelSize; i += 8) {
+      m_input = _mm256_load_ps(input_ptr + i);
+      m_sums1 = _mm256_fmadd_ps(m_input, _mm256_load_ps(k1 + i), m_sums1);
+      m_sums2 = _mm256_fmadd_ps(m_input, _mm256_load_ps(k2 + i), m_sums2);
+    }
+  }
+
+  // Linearly interpolate the two "convolutions".
+  __m128 m128_sums1 = _mm_add_ps(_mm256_extractf128_ps(m_sums1, 0),
+                                 _mm256_extractf128_ps(m_sums1, 1));
+  __m128 m128_sums2 = _mm_add_ps(_mm256_extractf128_ps(m_sums2, 0),
+                                 _mm256_extractf128_ps(m_sums2, 1));
+  m128_sums1 = _mm_mul_ps(
+      m128_sums1,
+      _mm_set_ps1(static_cast<float>(1.0 - kernel_interpolation_factor)));
+  m128_sums2 = _mm_mul_ps(
+      m128_sums2, _mm_set_ps1(static_cast<float>(kernel_interpolation_factor)));
+  m128_sums1 = _mm_add_ps(m128_sums1, m128_sums2);
+
+  // Sum components together.
+  float result;
+  m128_sums2 = _mm_add_ps(_mm_movehl_ps(m128_sums1, m128_sums1), m128_sums1);
+  _mm_store_ss(&result, _mm_add_ss(m128_sums2,
+                                   _mm_shuffle_ps(m128_sums2, m128_sums2, 1)));
+
+  return result;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/sinc_resampler_neon.cc b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_neon.cc
new file mode 100644
index 0000000000..9ee918bca3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_neon.cc
@@ -0,0 +1,48 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Modified from the Chromium original:
+// src/media/base/sinc_resampler.cc
+
+#include <arm_neon.h>
+
+#include "common_audio/resampler/sinc_resampler.h"
+
+namespace webrtc {
+
+float SincResampler::Convolve_NEON(const float* input_ptr,
+                                   const float* k1,
+                                   const float* k2,
+                                   double kernel_interpolation_factor) {
+  float32x4_t m_input;
+  float32x4_t m_sums1 = vmovq_n_f32(0);
+  float32x4_t m_sums2 = vmovq_n_f32(0);
+
+  const float* upper = input_ptr + kKernelSize;
+  for (; input_ptr < upper;) {
+    m_input = vld1q_f32(input_ptr);
+    input_ptr += 4;
+    m_sums1 = vmlaq_f32(m_sums1, m_input, vld1q_f32(k1));
+    k1 += 4;
+    m_sums2 = vmlaq_f32(m_sums2, m_input, vld1q_f32(k2));
+    k2 += 4;
+  }
+
+  // Linearly interpolate the two "convolutions".
+  m_sums1 = vmlaq_f32(
+      vmulq_f32(m_sums1, vmovq_n_f32(1.0 - kernel_interpolation_factor)),
+      m_sums2, vmovq_n_f32(kernel_interpolation_factor));
+
+  // Sum components together.
+  float32x2_t m_half = vadd_f32(vget_high_f32(m_sums1), vget_low_f32(m_sums1));
+  return vget_lane_f32(vpadd_f32(m_half, m_half), 0);
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/sinc_resampler_sse.cc b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_sse.cc
new file mode 100644
index 0000000000..30a8d1b2d9
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_sse.cc
@@ -0,0 +1,63 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Modified from the Chromium original:
+// src/media/base/simd/sinc_resampler_sse.cc
+
+#include <stddef.h>
+#include <stdint.h>
+#include <xmmintrin.h>
+
+#include "common_audio/resampler/sinc_resampler.h"
+
+namespace webrtc {
+
+float SincResampler::Convolve_SSE(const float* input_ptr,
+                                  const float* k1,
+                                  const float* k2,
+                                  double kernel_interpolation_factor) {
+  __m128 m_input;
+  __m128 m_sums1 = _mm_setzero_ps();
+  __m128 m_sums2 = _mm_setzero_ps();
+
+  // Based on `input_ptr` alignment, we need to use loadu or load.  Unrolling
+  // these loops hurt performance in local testing.
+  if (reinterpret_cast<uintptr_t>(input_ptr) & 0x0F) {
+    for (size_t i = 0; i < kKernelSize; i += 4) {
+      m_input = _mm_loadu_ps(input_ptr + i);
+      m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i)));
+      m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i)));
+    }
+  } else {
+    for (size_t i = 0; i < kKernelSize; i += 4) {
+      m_input = _mm_load_ps(input_ptr + i);
+      m_sums1 = _mm_add_ps(m_sums1, _mm_mul_ps(m_input, _mm_load_ps(k1 + i)));
+      m_sums2 = _mm_add_ps(m_sums2, _mm_mul_ps(m_input, _mm_load_ps(k2 + i)));
+    }
+  }
+
+  // Linearly interpolate the two "convolutions".
+  m_sums1 = _mm_mul_ps(
+      m_sums1,
+      _mm_set_ps1(static_cast<float>(1.0 - kernel_interpolation_factor)));
+  m_sums2 = _mm_mul_ps(
+      m_sums2, _mm_set_ps1(static_cast<float>(kernel_interpolation_factor)));
+  m_sums1 = _mm_add_ps(m_sums1, m_sums2);
+
+  // Sum components together.
+  float result;
+  m_sums2 = _mm_add_ps(_mm_movehl_ps(m_sums1, m_sums1), m_sums1);
+  _mm_store_ss(&result,
+               _mm_add_ss(m_sums2, _mm_shuffle_ps(m_sums2, m_sums2, 1)));
+
+  return result;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/sinc_resampler_unittest.cc b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_unittest.cc
new file mode 100644
index 0000000000..b267c89c8b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinc_resampler_unittest.cc
@@ -0,0 +1,393 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Modified from the Chromium original:
+// src/media/base/sinc_resampler_unittest.cc
+
+// MSVC++ requires this to be set before any other includes to get M_PI.
+#define _USE_MATH_DEFINES
+
+#include "common_audio/resampler/sinc_resampler.h"
+
+#include <math.h>
+
+#include <algorithm>
+#include <memory>
+#include <tuple>
+
+#include "common_audio/resampler/sinusoidal_linear_chirp_source.h"
+#include "rtc_base/system/arch.h"
+#include "rtc_base/time_utils.h"
+#include "system_wrappers/include/cpu_features_wrapper.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+using ::testing::_;
+
+namespace webrtc {
+
+static const double kSampleRateRatio = 192000.0 / 44100.0;
+static const double kKernelInterpolationFactor = 0.5;
+
+// Helper class to ensure ChunkedResample() functions properly.
+class MockSource : public SincResamplerCallback {
+ public:
+  MOCK_METHOD(void, Run, (size_t frames, float* destination), (override));
+};
+
+ACTION(ClearBuffer) {
+  memset(arg1, 0, arg0 * sizeof(float));
+}
+
+ACTION(FillBuffer) {
+  // Value chosen arbitrarily such that SincResampler resamples it to something
+  // easily representable on all platforms; e.g., using kSampleRateRatio this
+  // becomes 1.81219.
+  memset(arg1, 64, arg0 * sizeof(float));
+}
+
+// Test requesting multiples of ChunkSize() frames results in the proper number
+// of callbacks.
+TEST(SincResamplerTest, ChunkedResample) {
+  MockSource mock_source;
+
+  // Choose a high ratio of input to output samples which will result in quick
+  // exhaustion of SincResampler's internal buffers.
+  SincResampler resampler(kSampleRateRatio, SincResampler::kDefaultRequestSize,
+                          &mock_source);
+
+  static const int kChunks = 2;
+  size_t max_chunk_size = resampler.ChunkSize() * kChunks;
+  std::unique_ptr<float[]> resampled_destination(new float[max_chunk_size]);
+
+  // Verify requesting ChunkSize() frames causes a single callback.
+  EXPECT_CALL(mock_source, Run(_, _)).Times(1).WillOnce(ClearBuffer());
+  resampler.Resample(resampler.ChunkSize(), resampled_destination.get());
+
+  // Verify requesting kChunks * ChunkSize() frames causes kChunks callbacks.
+  ::testing::Mock::VerifyAndClear(&mock_source);
+  EXPECT_CALL(mock_source, Run(_, _))
+      .Times(kChunks)
+      .WillRepeatedly(ClearBuffer());
+  resampler.Resample(max_chunk_size, resampled_destination.get());
+}
+
+// Test flush resets the internal state properly.
+TEST(SincResamplerTest, Flush) {
+  MockSource mock_source;
+  SincResampler resampler(kSampleRateRatio, SincResampler::kDefaultRequestSize,
+                          &mock_source);
+  std::unique_ptr<float[]> resampled_destination(
+      new float[resampler.ChunkSize()]);
+
+  // Fill the resampler with junk data.
+  EXPECT_CALL(mock_source, Run(_, _)).Times(1).WillOnce(FillBuffer());
+  resampler.Resample(resampler.ChunkSize() / 2, resampled_destination.get());
+  ASSERT_NE(resampled_destination[0], 0);
+
+  // Flush and request more data, which should all be zeros now.
+  resampler.Flush();
+  ::testing::Mock::VerifyAndClear(&mock_source);
+  EXPECT_CALL(mock_source, Run(_, _)).Times(1).WillOnce(ClearBuffer());
+  resampler.Resample(resampler.ChunkSize() / 2, resampled_destination.get());
+  for (size_t i = 0; i < resampler.ChunkSize() / 2; ++i)
+    ASSERT_FLOAT_EQ(resampled_destination[i], 0);
+}
+
+// Test flush resets the internal state properly.
+TEST(SincResamplerTest, DISABLED_SetRatioBench) {
+  MockSource mock_source;
+  SincResampler resampler(kSampleRateRatio, SincResampler::kDefaultRequestSize,
+                          &mock_source);
+
+  int64_t start = rtc::TimeNanos();
+  for (int i = 1; i < 10000; ++i)
+    resampler.SetRatio(1.0 / i);
+  double total_time_c_us =
+      (rtc::TimeNanos() - start) / rtc::kNumNanosecsPerMicrosec;
+  printf("SetRatio() took %.2fms.\n", total_time_c_us / 1000);
+}
+
+// Ensure various optimized Convolve() methods return the same value.  Only run
+// this test if other optimized methods exist, otherwise the default Convolve()
+// will be tested by the parameterized SincResampler tests below.
+TEST(SincResamplerTest, Convolve) {
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+  ASSERT_TRUE(GetCPUInfo(kSSE2));
+#elif defined(WEBRTC_ARCH_ARM_V7)
+  ASSERT_TRUE(GetCPUFeaturesARM() & kCPUFeatureNEON);
+#endif
+
+  // Initialize a dummy resampler.
+  MockSource mock_source;
+  SincResampler resampler(kSampleRateRatio, SincResampler::kDefaultRequestSize,
+                          &mock_source);
+
+  // The optimized Convolve methods are slightly more precise than Convolve_C(),
+  // so comparison must be done using an epsilon.
+  static const double kEpsilon = 0.00000005;
+
+  // Use a kernel from SincResampler as input and kernel data, this has the
+  // benefit of already being properly sized and aligned for Convolve_SSE().
+  double result = resampler.Convolve_C(
+      resampler.kernel_storage_.get(), resampler.kernel_storage_.get(),
+      resampler.kernel_storage_.get(), kKernelInterpolationFactor);
+  double result2 = resampler.convolve_proc_(
+      resampler.kernel_storage_.get(), resampler.kernel_storage_.get(),
+      resampler.kernel_storage_.get(), kKernelInterpolationFactor);
+  EXPECT_NEAR(result2, result, kEpsilon);
+
+  // Test Convolve() w/ unaligned input pointer.
+  result = resampler.Convolve_C(
+      resampler.kernel_storage_.get() + 1, resampler.kernel_storage_.get(),
+      resampler.kernel_storage_.get(), kKernelInterpolationFactor);
+  result2 = resampler.convolve_proc_(
+      resampler.kernel_storage_.get() + 1, resampler.kernel_storage_.get(),
+      resampler.kernel_storage_.get(), kKernelInterpolationFactor);
+  EXPECT_NEAR(result2, result, kEpsilon);
+}
+
+// Benchmark for the various Convolve() methods.  Make sure to build with
+// branding=Chrome so that RTC_DCHECKs are compiled out when benchmarking.
+// Original benchmarks were run with --convolve-iterations=50000000.
+TEST(SincResamplerTest, ConvolveBenchmark) {
+  // Initialize a dummy resampler.
+  MockSource mock_source;
+  SincResampler resampler(kSampleRateRatio, SincResampler::kDefaultRequestSize,
+                          &mock_source);
+
+  // Retrieve benchmark iterations from command line.
+  // TODO(ajm): Reintroduce this as a command line option.
+  const int kConvolveIterations = 1000000;
+
+  printf("Benchmarking %d iterations:\n", kConvolveIterations);
+
+  // Benchmark Convolve_C().
+  int64_t start = rtc::TimeNanos();
+  for (int i = 0; i < kConvolveIterations; ++i) {
+    resampler.Convolve_C(
+        resampler.kernel_storage_.get(), resampler.kernel_storage_.get(),
+        resampler.kernel_storage_.get(), kKernelInterpolationFactor);
+  }
+  double total_time_c_us =
+      (rtc::TimeNanos() - start) / rtc::kNumNanosecsPerMicrosec;
+  printf("Convolve_C took %.2fms.\n", total_time_c_us / 1000);
+
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+  ASSERT_TRUE(GetCPUInfo(kSSE2));
+#elif defined(WEBRTC_ARCH_ARM_V7)
+  ASSERT_TRUE(GetCPUFeaturesARM() & kCPUFeatureNEON);
+#endif
+
+  // Benchmark with unaligned input pointer.
+  start = rtc::TimeNanos();
+  for (int j = 0; j < kConvolveIterations; ++j) {
+    resampler.convolve_proc_(
+        resampler.kernel_storage_.get() + 1, resampler.kernel_storage_.get(),
+        resampler.kernel_storage_.get(), kKernelInterpolationFactor);
+  }
+  double total_time_optimized_unaligned_us =
+      (rtc::TimeNanos() - start) / rtc::kNumNanosecsPerMicrosec;
+  printf(
+      "convolve_proc_(unaligned) took %.2fms; which is %.2fx "
+      "faster than Convolve_C.\n",
+      total_time_optimized_unaligned_us / 1000,
+      total_time_c_us / total_time_optimized_unaligned_us);
+
+  // Benchmark with aligned input pointer.
+  start = rtc::TimeNanos();
+  for (int j = 0; j < kConvolveIterations; ++j) {
+    resampler.convolve_proc_(
+        resampler.kernel_storage_.get(), resampler.kernel_storage_.get(),
+        resampler.kernel_storage_.get(), kKernelInterpolationFactor);
+  }
+  double total_time_optimized_aligned_us =
+      (rtc::TimeNanos() - start) / rtc::kNumNanosecsPerMicrosec;
+  printf(
+      "convolve_proc_ (aligned) took %.2fms; which is %.2fx "
+      "faster than Convolve_C and %.2fx faster than "
+      "convolve_proc_ (unaligned).\n",
+      total_time_optimized_aligned_us / 1000,
+      total_time_c_us / total_time_optimized_aligned_us,
+      total_time_optimized_unaligned_us / total_time_optimized_aligned_us);
+}
+
+typedef std::tuple<int, int, double, double> SincResamplerTestData;
+class SincResamplerTest
+    : public ::testing::TestWithParam<SincResamplerTestData> {
+ public:
+  SincResamplerTest()
+      : input_rate_(std::get<0>(GetParam())),
+        output_rate_(std::get<1>(GetParam())),
+        rms_error_(std::get<2>(GetParam())),
+        low_freq_error_(std::get<3>(GetParam())) {}
+
+  virtual ~SincResamplerTest() {}
+
+ protected:
+  int input_rate_;
+  int output_rate_;
+  double rms_error_;
+  double low_freq_error_;
+};
+
+// Tests resampling using a given input and output sample rate.
+TEST_P(SincResamplerTest, Resample) {
+  // Make comparisons using one second of data.
+  static const double kTestDurationSecs = 1;
+  const size_t input_samples =
+      static_cast<size_t>(kTestDurationSecs * input_rate_);
+  const size_t output_samples =
+      static_cast<size_t>(kTestDurationSecs * output_rate_);
+
+  // Nyquist frequency for the input sampling rate.
+  const double input_nyquist_freq = 0.5 * input_rate_;
+
+  // Source for data to be resampled.
+  SinusoidalLinearChirpSource resampler_source(input_rate_, input_samples,
+                                               input_nyquist_freq, 0);
+
+  const double io_ratio = input_rate_ / static_cast<double>(output_rate_);
+  SincResampler resampler(io_ratio, SincResampler::kDefaultRequestSize,
+                          &resampler_source);
+
+  // Force an update to the sample rate ratio to ensure dynamic sample rate
+  // changes are working correctly.
+  std::unique_ptr<float[]> kernel(new float[SincResampler::kKernelStorageSize]);
+  memcpy(kernel.get(), resampler.get_kernel_for_testing(),
+         SincResampler::kKernelStorageSize);
+  resampler.SetRatio(M_PI);
+  ASSERT_NE(0, memcmp(kernel.get(), resampler.get_kernel_for_testing(),
+                      SincResampler::kKernelStorageSize));
+  resampler.SetRatio(io_ratio);
+  ASSERT_EQ(0, memcmp(kernel.get(), resampler.get_kernel_for_testing(),
+                      SincResampler::kKernelStorageSize));
+
+  // TODO(dalecurtis): If we switch to AVX/SSE optimization, we'll need to
+  // allocate these on 32-byte boundaries and ensure they're sized % 32 bytes.
+  std::unique_ptr<float[]> resampled_destination(new float[output_samples]);
+  std::unique_ptr<float[]> pure_destination(new float[output_samples]);
+
+  // Generate resampled signal.
+  resampler.Resample(output_samples, resampled_destination.get());
+
+  // Generate pure signal.
+  SinusoidalLinearChirpSource pure_source(output_rate_, output_samples,
+                                          input_nyquist_freq, 0);
+  pure_source.Run(output_samples, pure_destination.get());
+
+  // Range of the Nyquist frequency (0.5 * min(input rate, output_rate)) which
+  // we refer to as low and high.
+  static const double kLowFrequencyNyquistRange = 0.7;
+  static const double kHighFrequencyNyquistRange = 0.9;
+
+  // Calculate Root-Mean-Square-Error and maximum error for the resampling.
+  double sum_of_squares = 0;
+  double low_freq_max_error = 0;
+  double high_freq_max_error = 0;
+  int minimum_rate = std::min(input_rate_, output_rate_);
+  double low_frequency_range = kLowFrequencyNyquistRange * 0.5 * minimum_rate;
+  double high_frequency_range = kHighFrequencyNyquistRange * 0.5 * minimum_rate;
+  for (size_t i = 0; i < output_samples; ++i) {
+    double error = fabs(resampled_destination[i] - pure_destination[i]);
+
+    if (pure_source.Frequency(i) < low_frequency_range) {
+      if (error > low_freq_max_error)
+        low_freq_max_error = error;
+    } else if (pure_source.Frequency(i) < high_frequency_range) {
+      if (error > high_freq_max_error)
+        high_freq_max_error = error;
+    }
+    // TODO(dalecurtis): Sanity check frequencies > kHighFrequencyNyquistRange.
+
+    sum_of_squares += error * error;
+  }
+
+  double rms_error = sqrt(sum_of_squares / output_samples);
+
+// Convert each error to dbFS.
+#define DBFS(x) 20 * log10(x)
+  rms_error = DBFS(rms_error);
+  low_freq_max_error = DBFS(low_freq_max_error);
+  high_freq_max_error = DBFS(high_freq_max_error);
+
+  EXPECT_LE(rms_error, rms_error_);
+  EXPECT_LE(low_freq_max_error, low_freq_error_);
+
+  // All conversions currently have a high frequency error around -6 dbFS.
+  static const double kHighFrequencyMaxError = -6.02;
+  EXPECT_LE(high_freq_max_error, kHighFrequencyMaxError);
+}
+
+// Almost all conversions have an RMS error of around -14 dbFS.
+static const double kResamplingRMSError = -14.58;
+
+// Thresholds chosen arbitrarily based on what each resampling reported during
+// testing.  All thresholds are in dbFS, http://en.wikipedia.org/wiki/DBFS.
+INSTANTIATE_TEST_SUITE_P(
+    SincResamplerTest,
+    SincResamplerTest,
+    ::testing::Values(
+        // To 22.05kHz
+        std::make_tuple(8000, 22050, kResamplingRMSError, -62.73),
+        std::make_tuple(11025, 22050, kResamplingRMSError, -72.19),
+        std::make_tuple(16000, 22050, kResamplingRMSError, -62.54),
+        std::make_tuple(22050, 22050, kResamplingRMSError, -73.53),
+        std::make_tuple(32000, 22050, kResamplingRMSError, -46.45),
+        std::make_tuple(44100, 22050, kResamplingRMSError, -28.49),
+        std::make_tuple(48000, 22050, -15.01, -25.56),
+        std::make_tuple(96000, 22050, -18.49, -13.42),
+        std::make_tuple(192000, 22050, -20.50, -9.23),
+
+        // To 44.1kHz
+        std::make_tuple(8000, 44100, kResamplingRMSError, -62.73),
+        std::make_tuple(11025, 44100, kResamplingRMSError, -72.19),
+        std::make_tuple(16000, 44100, kResamplingRMSError, -62.54),
+        std::make_tuple(22050, 44100, kResamplingRMSError, -73.53),
+        std::make_tuple(32000, 44100, kResamplingRMSError, -63.32),
+        std::make_tuple(44100, 44100, kResamplingRMSError, -73.52),
+        std::make_tuple(48000, 44100, -15.01, -64.04),
+        std::make_tuple(96000, 44100, -18.49, -25.51),
+        std::make_tuple(192000, 44100, -20.50, -13.31),
+
+        // To 48kHz
+        std::make_tuple(8000, 48000, kResamplingRMSError, -63.43),
+        std::make_tuple(11025, 48000, kResamplingRMSError, -62.61),
+        std::make_tuple(16000, 48000, kResamplingRMSError, -63.95),
+        std::make_tuple(22050, 48000, kResamplingRMSError, -62.42),
+        std::make_tuple(32000, 48000, kResamplingRMSError, -64.04),
+        std::make_tuple(44100, 48000, kResamplingRMSError, -62.63),
+        std::make_tuple(48000, 48000, kResamplingRMSError, -73.52),
+        std::make_tuple(96000, 48000, -18.40, -28.44),
+        std::make_tuple(192000, 48000, -20.43, -14.11),
+
+        // To 96kHz
+        std::make_tuple(8000, 96000, kResamplingRMSError, -63.19),
+        std::make_tuple(11025, 96000, kResamplingRMSError, -62.61),
+        std::make_tuple(16000, 96000, kResamplingRMSError, -63.39),
+        std::make_tuple(22050, 96000, kResamplingRMSError, -62.42),
+        std::make_tuple(32000, 96000, kResamplingRMSError, -63.95),
+        std::make_tuple(44100, 96000, kResamplingRMSError, -62.63),
+        std::make_tuple(48000, 96000, kResamplingRMSError, -73.52),
+        std::make_tuple(96000, 96000, kResamplingRMSError, -73.52),
+        std::make_tuple(192000, 96000, kResamplingRMSError, -28.41),
+
+        // To 192kHz
+        std::make_tuple(8000, 192000, kResamplingRMSError, -63.10),
+        std::make_tuple(11025, 192000, kResamplingRMSError, -62.61),
+        std::make_tuple(16000, 192000, kResamplingRMSError, -63.14),
+        std::make_tuple(22050, 192000, kResamplingRMSError, -62.42),
+        std::make_tuple(32000, 192000, kResamplingRMSError, -63.38),
+        std::make_tuple(44100, 192000, kResamplingRMSError, -62.63),
+        std::make_tuple(48000, 192000, kResamplingRMSError, -73.44),
+        std::make_tuple(96000, 192000, kResamplingRMSError, -73.52),
+        std::make_tuple(192000, 192000, kResamplingRMSError, -73.52)));
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc b/third_party/libwebrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc
new file mode 100644
index 0000000000..2afdd1be47
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// MSVC++ requires this to be set before any other includes to get M_PI.
+#define _USE_MATH_DEFINES
+
+#include "common_audio/resampler/sinusoidal_linear_chirp_source.h"
+
+#include <math.h>
+
+namespace webrtc {
+
+SinusoidalLinearChirpSource::SinusoidalLinearChirpSource(int sample_rate,
+                                                         size_t samples,
+                                                         double max_frequency,
+                                                         double delay_samples)
+    : sample_rate_(sample_rate),
+      total_samples_(samples),
+      max_frequency_(max_frequency),
+      current_index_(0),
+      delay_samples_(delay_samples) {
+  // Chirp rate.
+  double duration = static_cast<double>(total_samples_) / sample_rate_;
+  k_ = (max_frequency_ - kMinFrequency) / duration;
+}
+
+void SinusoidalLinearChirpSource::Run(size_t frames, float* destination) {
+  for (size_t i = 0; i < frames; ++i, ++current_index_) {
+    // Filter out frequencies higher than Nyquist.
+    if (Frequency(current_index_) > 0.5 * sample_rate_) {
+      destination[i] = 0;
+    } else {
+      // Calculate time in seconds.
+      if (current_index_ < delay_samples_) {
+        destination[i] = 0;
+      } else {
+        // Sinusoidal linear chirp.
+        double t = (current_index_ - delay_samples_) / sample_rate_;
+        destination[i] = sin(2 * M_PI * (kMinFrequency * t + (k_ / 2) * t * t));
+      }
+    }
+  }
+}
+
+double SinusoidalLinearChirpSource::Frequency(size_t position) {
+  return kMinFrequency + (position - delay_samples_) *
+                             (max_frequency_ - kMinFrequency) / total_samples_;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/resampler/sinusoidal_linear_chirp_source.h b/third_party/libwebrtc/common_audio/resampler/sinusoidal_linear_chirp_source.h
new file mode 100644
index 0000000000..ccd11bbd61
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/resampler/sinusoidal_linear_chirp_source.h
@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Modified from the Chromium original here:
+// src/media/base/sinc_resampler_unittest.cc
+
+#ifndef COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
+#define COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
+
+#include "common_audio/resampler/sinc_resampler.h"
+
+namespace webrtc {
+
+// Fake audio source for testing the resampler.  Generates a sinusoidal linear
+// chirp (http://en.wikipedia.org/wiki/Chirp) which can be tuned to stress the
+// resampler for the specific sample rate conversion being used.
+class SinusoidalLinearChirpSource : public SincResamplerCallback {
+ public:
+  // `delay_samples` can be used to insert a fractional sample delay into the
+  // source.  It will produce zeros until non-negative time is reached.
+  SinusoidalLinearChirpSource(int sample_rate,
+                              size_t samples,
+                              double max_frequency,
+                              double delay_samples);
+
+  ~SinusoidalLinearChirpSource() override {}
+
+  SinusoidalLinearChirpSource(const SinusoidalLinearChirpSource&) = delete;
+  SinusoidalLinearChirpSource& operator=(const SinusoidalLinearChirpSource&) =
+      delete;
+
+  void Run(size_t frames, float* destination) override;
+
+  double Frequency(size_t position);
+
+ private:
+  static constexpr int kMinFrequency = 5;
+
+  int sample_rate_;
+  size_t total_samples_;
+  double max_frequency_;
+  double k_;
+  size_t current_index_;
+  double delay_samples_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
diff --git a/third_party/libwebrtc/common_audio/ring_buffer.c b/third_party/libwebrtc/common_audio/ring_buffer.c
new file mode 100644
index 0000000000..590f5f9bf1
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/ring_buffer.c
@@ -0,0 +1,232 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// A ring buffer to hold arbitrary data. Provides no thread safety. Unless
+// otherwise specified, functions return 0 on success and -1 on error.
+
+#include "common_audio/ring_buffer.h"
+
+#include <stddef.h>  // size_t
+#include <stdlib.h>
+#include <string.h>
+
+// Get address of region(s) from which we can read data.
+// If the region is contiguous, `data_ptr_bytes_2` will be zero.
+// If non-contiguous, `data_ptr_bytes_2` will be the size in bytes of the second
+// region. Returns room available to be read or `element_count`, whichever is
+// smaller.
+static size_t GetBufferReadRegions(RingBuffer* buf,
+                                   size_t element_count,
+                                   void** data_ptr_1,
+                                   size_t* data_ptr_bytes_1,
+                                   void** data_ptr_2,
+                                   size_t* data_ptr_bytes_2) {
+
+  const size_t readable_elements = WebRtc_available_read(buf);
+  const size_t read_elements = (readable_elements < element_count ?
+      readable_elements : element_count);
+  const size_t margin = buf->element_count - buf->read_pos;
+
+  // Check to see if read is not contiguous.
+  if (read_elements > margin) {
+    // Write data in two blocks that wrap the buffer.
+    *data_ptr_1 = buf->data + buf->read_pos * buf->element_size;
+    *data_ptr_bytes_1 = margin * buf->element_size;
+    *data_ptr_2 = buf->data;
+    *data_ptr_bytes_2 = (read_elements - margin) * buf->element_size;
+  } else {
+    *data_ptr_1 = buf->data + buf->read_pos * buf->element_size;
+    *data_ptr_bytes_1 = read_elements * buf->element_size;
+    *data_ptr_2 = NULL;
+    *data_ptr_bytes_2 = 0;
+  }
+
+  return read_elements;
+}
+
+RingBuffer* WebRtc_CreateBuffer(size_t element_count, size_t element_size) {
+  RingBuffer* self = NULL;
+  if (element_count == 0 || element_size == 0) {
+    return NULL;
+  }
+
+  self = malloc(sizeof(RingBuffer));
+  if (!self) {
+    return NULL;
+  }
+
+  self->data = malloc(element_count * element_size);
+  if (!self->data) {
+    free(self);
+    self = NULL;
+    return NULL;
+  }
+
+  self->element_count = element_count;
+  self->element_size = element_size;
+  WebRtc_InitBuffer(self);
+
+  return self;
+}
+
+void WebRtc_InitBuffer(RingBuffer* self) {
+  self->read_pos = 0;
+  self->write_pos = 0;
+  self->rw_wrap = SAME_WRAP;
+
+  // Initialize buffer to zeros
+  memset(self->data, 0, self->element_count * self->element_size);
+}
+
+void WebRtc_FreeBuffer(void* handle) {
+  RingBuffer* self = (RingBuffer*)handle;
+  if (!self) {
+    return;
+  }
+
+  free(self->data);
+  free(self);
+}
+
+size_t WebRtc_ReadBuffer(RingBuffer* self,
+                         void** data_ptr,
+                         void* data,
+                         size_t element_count) {
+
+  if (self == NULL) {
+    return 0;
+  }
+  if (data == NULL) {
+    return 0;
+  }
+
+  {
+    void* buf_ptr_1 = NULL;
+    void* buf_ptr_2 = NULL;
+    size_t buf_ptr_bytes_1 = 0;
+    size_t buf_ptr_bytes_2 = 0;
+    const size_t read_count = GetBufferReadRegions(self,
+                                                   element_count,
+                                                   &buf_ptr_1,
+                                                   &buf_ptr_bytes_1,
+                                                   &buf_ptr_2,
+                                                   &buf_ptr_bytes_2);
+    if (buf_ptr_bytes_2 > 0) {
+      // We have a wrap around when reading the buffer. Copy the buffer data to
+      // `data` and point to it.
+      memcpy(data, buf_ptr_1, buf_ptr_bytes_1);
+      memcpy(((char*) data) + buf_ptr_bytes_1, buf_ptr_2, buf_ptr_bytes_2);
+      buf_ptr_1 = data;
+    } else if (!data_ptr) {
+      // No wrap, but a memcpy was requested.
+      memcpy(data, buf_ptr_1, buf_ptr_bytes_1);
+    }
+    if (data_ptr) {
+      // `buf_ptr_1` == `data` in the case of a wrap.
+      *data_ptr = read_count == 0 ? NULL : buf_ptr_1;
+    }
+
+    // Update read position
+    WebRtc_MoveReadPtr(self, (int) read_count);
+
+    return read_count;
+  }
+}
+
+size_t WebRtc_WriteBuffer(RingBuffer* self,
+                          const void* data,
+                          size_t element_count) {
+  if (!self) {
+    return 0;
+  }
+  if (!data) {
+    return 0;
+  }
+
+  {
+    const size_t free_elements = WebRtc_available_write(self);
+    const size_t write_elements = (free_elements < element_count ? free_elements
+        : element_count);
+    size_t n = write_elements;
+    const size_t margin = self->element_count - self->write_pos;
+
+    if (write_elements > margin) {
+      // Buffer wrap around when writing.
+      memcpy(self->data + self->write_pos * self->element_size,
+             data, margin * self->element_size);
+      self->write_pos = 0;
+      n -= margin;
+      self->rw_wrap = DIFF_WRAP;
+    }
+    memcpy(self->data + self->write_pos * self->element_size,
+           ((const char*) data) + ((write_elements - n) * self->element_size),
+           n * self->element_size);
+    self->write_pos += n;
+
+    return write_elements;
+  }
+}
+
+int WebRtc_MoveReadPtr(RingBuffer* self, int element_count) {
+  if (!self) {
+    return 0;
+  }
+
+  {
+    // We need to be able to take care of negative changes, hence use "int"
+    // instead of "size_t".
+    const int free_elements = (int) WebRtc_available_write(self);
+    const int readable_elements = (int) WebRtc_available_read(self);
+    int read_pos = (int) self->read_pos;
+
+    if (element_count > readable_elements) {
+      element_count = readable_elements;
+    }
+    if (element_count < -free_elements) {
+      element_count = -free_elements;
+    }
+
+    read_pos += element_count;
+    if (read_pos > (int) self->element_count) {
+      // Buffer wrap around. Restart read position and wrap indicator.
+      read_pos -= (int) self->element_count;
+      self->rw_wrap = SAME_WRAP;
+    }
+    if (read_pos < 0) {
+      // Buffer wrap around. Restart read position and wrap indicator.
+      read_pos += (int) self->element_count;
+      self->rw_wrap = DIFF_WRAP;
+    }
+
+    self->read_pos = (size_t) read_pos;
+
+    return element_count;
+  }
+}
+
+size_t WebRtc_available_read(const RingBuffer* self) {
+  if (!self) {
+    return 0;
+  }
+
+  if (self->rw_wrap == SAME_WRAP) {
+    return self->write_pos - self->read_pos;
+  } else {
+    return self->element_count - self->read_pos + self->write_pos;
+  }
+}
+
+size_t WebRtc_available_write(const RingBuffer* self) {
+  if (!self) {
+    return 0;
+  }
+
+  return self->element_count - WebRtc_available_read(self);
+}
diff --git a/third_party/libwebrtc/common_audio/ring_buffer.h b/third_party/libwebrtc/common_audio/ring_buffer.h
new file mode 100644
index 0000000000..de0b4fed80
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/ring_buffer.h
@@ -0,0 +1,79 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// A ring buffer to hold arbitrary data. Provides no thread safety. Unless
+// otherwise specified, functions return 0 on success and -1 on error.
+
+#ifndef COMMON_AUDIO_RING_BUFFER_H_
+#define COMMON_AUDIO_RING_BUFFER_H_
+
+// TODO(alessiob): Used by AEC, AECm and AudioRingBuffer. Remove when possible.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>  // size_t
+
+enum Wrap { SAME_WRAP, DIFF_WRAP };
+
+typedef struct RingBuffer {
+  size_t read_pos;
+  size_t write_pos;
+  size_t element_count;
+  size_t element_size;
+  enum Wrap rw_wrap;
+  char* data;
+} RingBuffer;
+
+// Creates and initializes the buffer. Returns null on failure.
+RingBuffer* WebRtc_CreateBuffer(size_t element_count, size_t element_size);
+void WebRtc_InitBuffer(RingBuffer* handle);
+void WebRtc_FreeBuffer(void* handle);
+
+// Reads data from the buffer. Returns the number of elements that were read.
+// The `data_ptr` will point to the address where the read data is located.
+// If no data can be read, `data_ptr` is set to `NULL`. If all data can be read
+// without buffer wrap around then `data_ptr` will point to the location in the
+// buffer. Otherwise, the data will be copied to `data` (memory allocation done
+// by the user) and `data_ptr` points to the address of `data`. `data_ptr` is
+// only guaranteed to be valid until the next call to WebRtc_WriteBuffer().
+//
+// To force a copying to `data`, pass a null `data_ptr`.
+//
+// Returns number of elements read.
+size_t WebRtc_ReadBuffer(RingBuffer* handle,
+                         void** data_ptr,
+                         void* data,
+                         size_t element_count);
+
+// Writes `data` to buffer and returns the number of elements written.
+size_t WebRtc_WriteBuffer(RingBuffer* handle,
+                          const void* data,
+                          size_t element_count);
+
+// Moves the buffer read position and returns the number of elements moved.
+// Positive `element_count` moves the read position towards the write position,
+// that is, flushing the buffer. Negative `element_count` moves the read
+// position away from the the write position, that is, stuffing the buffer.
+// Returns number of elements moved.
+int WebRtc_MoveReadPtr(RingBuffer* handle, int element_count);
+
+// Returns number of available elements to read.
+size_t WebRtc_available_read(const RingBuffer* handle);
+
+// Returns number of available elements for write.
+size_t WebRtc_available_write(const RingBuffer* handle);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // COMMON_AUDIO_RING_BUFFER_H_
diff --git a/third_party/libwebrtc/common_audio/ring_buffer_unittest.cc b/third_party/libwebrtc/common_audio/ring_buffer_unittest.cc
new file mode 100644
index 0000000000..0ead7e7981
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/ring_buffer_unittest.cc
@@ -0,0 +1,150 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/ring_buffer.h"
+
+#include <stdlib.h>
+#include <time.h>
+
+#include <algorithm>
+#include <memory>
+
+#include "test/gtest.h"
+
+namespace webrtc {
+
+struct FreeBufferDeleter {
+  inline void operator()(void* ptr) const { WebRtc_FreeBuffer(ptr); }
+};
+typedef std::unique_ptr<RingBuffer, FreeBufferDeleter> scoped_ring_buffer;
+
+static void AssertElementEq(int expected, int actual) {
+  ASSERT_EQ(expected, actual);
+}
+
+static int SetIncrementingData(int* data,
+                               int num_elements,
+                               int starting_value) {
+  for (int i = 0; i < num_elements; i++) {
+    data[i] = starting_value++;
+  }
+  return starting_value;
+}
+
+static int CheckIncrementingData(int* data,
+                                 int num_elements,
+                                 int starting_value) {
+  for (int i = 0; i < num_elements; i++) {
+    AssertElementEq(starting_value++, data[i]);
+  }
+  return starting_value;
+}
+
+// We use ASSERTs in this test to avoid obscuring the seed in the case of a
+// failure.
+static void RandomStressTest(int** data_ptr) {
+  const int kNumTests = 10;
+  const int kNumOps = 1000;
+  const int kMaxBufferSize = 1000;
+
+  unsigned int seed = time(nullptr);
+  printf("seed=%u\n", seed);
+  srand(seed);
+  for (int i = 0; i < kNumTests; i++) {
+    // rand_r is not supported on many platforms, so rand is used.
+    const int buffer_size = std::max(rand() % kMaxBufferSize, 1);  // NOLINT
+    std::unique_ptr<int[]> write_data(new int[buffer_size]);
+    std::unique_ptr<int[]> read_data(new int[buffer_size]);
+    scoped_ring_buffer buffer(WebRtc_CreateBuffer(buffer_size, sizeof(int)));
+    ASSERT_TRUE(buffer.get() != nullptr);
+    WebRtc_InitBuffer(buffer.get());
+    int buffer_consumed = 0;
+    int write_element = 0;
+    int read_element = 0;
+    for (int j = 0; j < kNumOps; j++) {
+      const bool write = rand() % 2 == 0 ? true : false;  // NOLINT
+      const int num_elements = rand() % buffer_size;      // NOLINT
+      if (write) {
+        const int buffer_available = buffer_size - buffer_consumed;
+        ASSERT_EQ(static_cast<size_t>(buffer_available),
+                  WebRtc_available_write(buffer.get()));
+        const int expected_elements = std::min(num_elements, buffer_available);
+        write_element = SetIncrementingData(write_data.get(), expected_elements,
+                                            write_element);
+        ASSERT_EQ(
+            static_cast<size_t>(expected_elements),
+            WebRtc_WriteBuffer(buffer.get(), write_data.get(), num_elements));
+        buffer_consumed =
+            std::min(buffer_consumed + expected_elements, buffer_size);
+      } else {
+        const int expected_elements = std::min(num_elements, buffer_consumed);
+        ASSERT_EQ(static_cast<size_t>(buffer_consumed),
+                  WebRtc_available_read(buffer.get()));
+        ASSERT_EQ(
+            static_cast<size_t>(expected_elements),
+            WebRtc_ReadBuffer(buffer.get(), reinterpret_cast<void**>(data_ptr),
+                              read_data.get(), num_elements));
+        int* check_ptr = read_data.get();
+        if (data_ptr) {
+          check_ptr = *data_ptr;
+        }
+        read_element =
+            CheckIncrementingData(check_ptr, expected_elements, read_element);
+        buffer_consumed = std::max(buffer_consumed - expected_elements, 0);
+      }
+    }
+  }
+}
+
+TEST(RingBufferTest, RandomStressTest) {
+  int* data_ptr = nullptr;
+  RandomStressTest(&data_ptr);
+}
+
+TEST(RingBufferTest, RandomStressTestWithNullPtr) {
+  RandomStressTest(nullptr);
+}
+
+TEST(RingBufferTest, PassingNulltoReadBufferForcesMemcpy) {
+  const size_t kDataSize = 2;
+  int write_data[kDataSize];
+  int read_data[kDataSize];
+  int* data_ptr;
+
+  scoped_ring_buffer buffer(WebRtc_CreateBuffer(kDataSize, sizeof(int)));
+  ASSERT_TRUE(buffer.get() != nullptr);
+  WebRtc_InitBuffer(buffer.get());
+
+  SetIncrementingData(write_data, kDataSize, 0);
+  EXPECT_EQ(kDataSize, WebRtc_WriteBuffer(buffer.get(), write_data, kDataSize));
+  SetIncrementingData(read_data, kDataSize, kDataSize);
+  EXPECT_EQ(kDataSize,
+            WebRtc_ReadBuffer(buffer.get(), reinterpret_cast<void**>(&data_ptr),
+                              read_data, kDataSize));
+  // Copying was not necessary, so `read_data` has not been updated.
+  CheckIncrementingData(data_ptr, kDataSize, 0);
+  CheckIncrementingData(read_data, kDataSize, kDataSize);
+
+  EXPECT_EQ(kDataSize, WebRtc_WriteBuffer(buffer.get(), write_data, kDataSize));
+  EXPECT_EQ(kDataSize,
+            WebRtc_ReadBuffer(buffer.get(), nullptr, read_data, kDataSize));
+  // Passing null forces a memcpy, so `read_data` is now updated.
+  CheckIncrementingData(read_data, kDataSize, 0);
+}
+
+TEST(RingBufferTest, CreateHandlesErrors) {
+  EXPECT_TRUE(WebRtc_CreateBuffer(0, 1) == nullptr);
+  EXPECT_TRUE(WebRtc_CreateBuffer(1, 0) == nullptr);
+  RingBuffer* buffer = WebRtc_CreateBuffer(1, 1);
+  EXPECT_TRUE(buffer != nullptr);
+  WebRtc_FreeBuffer(buffer);
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/signal_processing/auto_corr_to_refl_coef.c b/third_party/libwebrtc/common_audio/signal_processing/auto_corr_to_refl_coef.c
new file mode 100644
index 0000000000..a3ec24f5da
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/auto_corr_to_refl_coef.c
@@ -0,0 +1,103 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_AutoCorrToReflCoef().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_AutoCorrToReflCoef(const int32_t *R, int use_order, int16_t *K)
+{
+    int i, n;
+    int16_t tmp;
+    const int32_t *rptr;
+    int32_t L_num, L_den;
+    int16_t *acfptr, *pptr, *wptr, *p1ptr, *w1ptr, ACF[WEBRTC_SPL_MAX_LPC_ORDER],
+            P[WEBRTC_SPL_MAX_LPC_ORDER], W[WEBRTC_SPL_MAX_LPC_ORDER];
+
+    // Initialize loop and pointers.
+    acfptr = ACF;
+    rptr = R;
+    pptr = P;
+    p1ptr = &P[1];
+    w1ptr = &W[1];
+    wptr = w1ptr;
+
+    // First loop; n=0. Determine shifting.
+    tmp = WebRtcSpl_NormW32(*R);
+    *acfptr = (int16_t)((*rptr++ << tmp) >> 16);
+    *pptr++ = *acfptr++;
+
+    // Initialize ACF, P and W.
+    for (i = 1; i <= use_order; i++)
+    {
+        *acfptr = (int16_t)((*rptr++ << tmp) >> 16);
+        *wptr++ = *acfptr;
+        *pptr++ = *acfptr++;
+    }
+
+    // Compute reflection coefficients.
+    for (n = 1; n <= use_order; n++, K++)
+    {
+        tmp = WEBRTC_SPL_ABS_W16(*p1ptr);
+        if (*P < tmp)
+        {
+            for (i = n; i <= use_order; i++)
+                *K++ = 0;
+
+            return;
+        }
+
+        // Division: WebRtcSpl_div(tmp, *P)
+        *K = 0;
+        if (tmp != 0)
+        {
+            L_num = tmp;
+            L_den = *P;
+            i = 15;
+            while (i--)
+            {
+                (*K) <<= 1;
+                L_num <<= 1;
+                if (L_num >= L_den)
+                {
+                    L_num -= L_den;
+                    (*K)++;
+                }
+            }
+            if (*p1ptr > 0)
+                *K = -*K;
+        }
+
+        // Last iteration; don't do Schur recursion.
+        if (n == use_order)
+            return;
+
+        // Schur recursion.
+        pptr = P;
+        wptr = w1ptr;
+        tmp = (int16_t)(((int32_t)*p1ptr * (int32_t)*K + 16384) >> 15);
+        *pptr = WebRtcSpl_AddSatW16(*pptr, tmp);
+        pptr++;
+        for (i = 1; i <= use_order - n; i++)
+        {
+            tmp = (int16_t)(((int32_t)*wptr * (int32_t)*K + 16384) >> 15);
+            *pptr = WebRtcSpl_AddSatW16(*(pptr + 1), tmp);
+            pptr++;
+            tmp = (int16_t)(((int32_t)*pptr * (int32_t)*K + 16384) >> 15);
+            *wptr = WebRtcSpl_AddSatW16(*wptr, tmp);
+            wptr++;
+        }
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/auto_correlation.c b/third_party/libwebrtc/common_audio/signal_processing/auto_correlation.c
new file mode 100644
index 0000000000..1455820e8f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/auto_correlation.c
@@ -0,0 +1,65 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#include "rtc_base/checks.h"
+
+size_t WebRtcSpl_AutoCorrelation(const int16_t* in_vector,
+                                 size_t in_vector_length,
+                                 size_t order,
+                                 int32_t* result,
+                                 int* scale) {
+  int32_t sum = 0;
+  size_t i = 0, j = 0;
+  int16_t smax = 0;
+  int scaling = 0;
+
+  RTC_DCHECK_LE(order, in_vector_length);
+
+  // Find the maximum absolute value of the samples.
+  smax = WebRtcSpl_MaxAbsValueW16(in_vector, in_vector_length);
+
+  // In order to avoid overflow when computing the sum we should scale the
+  // samples so that (in_vector_length * smax * smax) will not overflow.
+  if (smax == 0) {
+    scaling = 0;
+  } else {
+    // Number of bits in the sum loop.
+    int nbits = WebRtcSpl_GetSizeInBits((uint32_t)in_vector_length);
+    // Number of bits to normalize smax.
+    int t = WebRtcSpl_NormW32(WEBRTC_SPL_MUL(smax, smax));
+
+    if (t > nbits) {
+      scaling = 0;
+    } else {
+      scaling = nbits - t;
+    }
+  }
+
+  // Perform the actual correlation calculation.
+  for (i = 0; i < order + 1; i++) {
+    sum = 0;
+    /* Unroll the loop to improve performance. */
+    for (j = 0; i + j + 3 < in_vector_length; j += 4) {
+      sum += (in_vector[j + 0] * in_vector[i + j + 0]) >> scaling;
+      sum += (in_vector[j + 1] * in_vector[i + j + 1]) >> scaling;
+      sum += (in_vector[j + 2] * in_vector[i + j + 2]) >> scaling;
+      sum += (in_vector[j + 3] * in_vector[i + j + 3]) >> scaling;
+    }
+    for (; j < in_vector_length - i; j++) {
+      sum += (in_vector[j] * in_vector[i + j]) >> scaling;
+    }
+    *result++ = sum;
+  }
+
+  *scale = scaling;
+  return order + 1;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c b/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c
new file mode 100644
index 0000000000..1c82cff50f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse.c
@@ -0,0 +1,108 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+/* Tables for data buffer indexes that are bit reversed and thus need to be
+ * swapped. Note that, index_7[{0, 2, 4, ...}] are for the left side of the swap
+ * operations, while index_7[{1, 3, 5, ...}] are for the right side of the
+ * operation. Same for index_8.
+ */
+
+/* Indexes for the case of stages == 7. */
+static const int16_t index_7[112] = {
+  1, 64, 2, 32, 3, 96, 4, 16, 5, 80, 6, 48, 7, 112, 9, 72, 10, 40, 11, 104,
+  12, 24, 13, 88, 14, 56, 15, 120, 17, 68, 18, 36, 19, 100, 21, 84, 22, 52,
+  23, 116, 25, 76, 26, 44, 27, 108, 29, 92, 30, 60, 31, 124, 33, 66, 35, 98,
+  37, 82, 38, 50, 39, 114, 41, 74, 43, 106, 45, 90, 46, 58, 47, 122, 49, 70,
+  51, 102, 53, 86, 55, 118, 57, 78, 59, 110, 61, 94, 63, 126, 67, 97, 69,
+  81, 71, 113, 75, 105, 77, 89, 79, 121, 83, 101, 87, 117, 91, 109, 95, 125,
+  103, 115, 111, 123
+};
+
+/* Indexes for the case of stages == 8. */
+static const int16_t index_8[240] = {
+  1, 128, 2, 64, 3, 192, 4, 32, 5, 160, 6, 96, 7, 224, 8, 16, 9, 144, 10, 80,
+  11, 208, 12, 48, 13, 176, 14, 112, 15, 240, 17, 136, 18, 72, 19, 200, 20,
+  40, 21, 168, 22, 104, 23, 232, 25, 152, 26, 88, 27, 216, 28, 56, 29, 184,
+  30, 120, 31, 248, 33, 132, 34, 68, 35, 196, 37, 164, 38, 100, 39, 228, 41,
+  148, 42, 84, 43, 212, 44, 52, 45, 180, 46, 116, 47, 244, 49, 140, 50, 76,
+  51, 204, 53, 172, 54, 108, 55, 236, 57, 156, 58, 92, 59, 220, 61, 188, 62,
+  124, 63, 252, 65, 130, 67, 194, 69, 162, 70, 98, 71, 226, 73, 146, 74, 82,
+  75, 210, 77, 178, 78, 114, 79, 242, 81, 138, 83, 202, 85, 170, 86, 106, 87,
+  234, 89, 154, 91, 218, 93, 186, 94, 122, 95, 250, 97, 134, 99, 198, 101,
+  166, 103, 230, 105, 150, 107, 214, 109, 182, 110, 118, 111, 246, 113, 142,
+  115, 206, 117, 174, 119, 238, 121, 158, 123, 222, 125, 190, 127, 254, 131,
+  193, 133, 161, 135, 225, 137, 145, 139, 209, 141, 177, 143, 241, 147, 201,
+  149, 169, 151, 233, 155, 217, 157, 185, 159, 249, 163, 197, 167, 229, 171,
+  213, 173, 181, 175, 245, 179, 205, 183, 237, 187, 221, 191, 253, 199, 227,
+  203, 211, 207, 243, 215, 235, 223, 251, 239, 247
+};
+
+void WebRtcSpl_ComplexBitReverse(int16_t* __restrict complex_data, int stages) {
+  /* For any specific value of stages, we know exactly the indexes that are
+   * bit reversed. Currently (Feb. 2012) in WebRTC the only possible values of
+   * stages are 7 and 8, so we use tables to save unnecessary iterations and
+   * calculations for these two cases.
+   */
+  if (stages == 7 || stages == 8) {
+    int m = 0;
+    int length = 112;
+    const int16_t* index = index_7;
+
+    if (stages == 8) {
+      length = 240;
+      index = index_8;
+    }
+
+    /* Decimation in time. Swap the elements with bit-reversed indexes. */
+    for (m = 0; m < length; m += 2) {
+      /* We declare a int32_t* type pointer, to load both the 16-bit real
+       * and imaginary elements from complex_data in one instruction, reducing
+       * complexity.
+       */
+      int32_t* complex_data_ptr = (int32_t*)complex_data;
+      int32_t temp = 0;
+
+      temp = complex_data_ptr[index[m]];  /* Real and imaginary */
+      complex_data_ptr[index[m]] = complex_data_ptr[index[m + 1]];
+      complex_data_ptr[index[m + 1]] = temp;
+    }
+  }
+  else {
+    int m = 0, mr = 0, l = 0;
+    int n = 1 << stages;
+    int nn = n - 1;
+
+    /* Decimation in time - re-order data */
+    for (m = 1; m <= nn; ++m) {
+      int32_t* complex_data_ptr = (int32_t*)complex_data;
+      int32_t temp = 0;
+
+      /* Find out indexes that are bit-reversed. */
+      l = n;
+      do {
+        l >>= 1;
+      } while (l > nn - mr);
+      mr = (mr & (l - 1)) + l;
+
+      if (mr <= m) {
+        continue;
+      }
+
+      /* Swap the elements with bit-reversed indexes.
+       * This is similar to the loop in the stages == 7 or 8 cases.
+       */
+      temp = complex_data_ptr[m];  /* Real and imaginary */
+      complex_data_ptr[m] = complex_data_ptr[mr];
+      complex_data_ptr[mr] = temp;
+    }
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_arm.S b/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_arm.S
new file mode 100644
index 0000000000..be8e181aa7
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_arm.S
@@ -0,0 +1,119 @@
+@
+@ Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+@
+@ Use of this source code is governed by a BSD-style license
+@ that can be found in the LICENSE file in the root of the source
+@ tree. An additional intellectual property rights grant can be found
+@ in the file PATENTS.  All contributing project authors may
+@ be found in the AUTHORS file in the root of the source tree.
+@
+
+@ This file contains the function WebRtcSpl_ComplexBitReverse(), optimized
+@ for ARMv5 platforms.
+@ Reference C code is in file complex_bit_reverse.c. Bit-exact.
+
+#include "rtc_base/system/asm_defines.h"
+
+GLOBAL_FUNCTION WebRtcSpl_ComplexBitReverse
+.align  2
+DEFINE_FUNCTION WebRtcSpl_ComplexBitReverse
+  push {r4-r7}
+
+  cmp r1, #7
+  adr r3, index_7                 @ Table pointer.
+  mov r4, #112                    @ Number of interations.
+  beq PRE_LOOP_STAGES_7_OR_8
+
+  cmp r1, #8
+  adr r3, index_8                 @ Table pointer.
+  mov r4, #240                    @ Number of interations.
+  beq PRE_LOOP_STAGES_7_OR_8
+
+  mov r3, #1                      @ Initialize m.
+  mov r1, r3, asl r1              @ n = 1 << stages;
+  subs r6, r1, #1                 @ nn = n - 1;
+  ble END
+
+  mov r5, r0                      @ &complex_data
+  mov r4, #0                      @ ml
+
+LOOP_GENERIC:
+  rsb r12, r4, r6                 @ l > nn - mr
+  mov r2, r1                      @ n
+
+LOOP_SHIFT:
+  asr r2, #1                      @ l >>= 1;
+  cmp r2, r12
+  bgt LOOP_SHIFT
+
+  sub r12, r2, #1
+  and r4, r12, r4
+  add r4, r2                      @ mr = (mr & (l - 1)) + l;
+  cmp r4, r3                      @ mr <= m ?
+  ble UPDATE_REGISTERS
+
+  mov r12, r4, asl #2
+  ldr r7, [r5, #4]                @ complex_data[2 * m, 2 * m + 1].
+                                  @   Offset 4 due to m incrementing from 1.
+  ldr r2, [r0, r12]               @ complex_data[2 * mr, 2 * mr + 1].
+  str r7, [r0, r12]
+  str r2, [r5, #4]
+
+UPDATE_REGISTERS:
+  add r3, r3, #1
+  add r5, #4
+  cmp r3, r1
+  bne LOOP_GENERIC
+
+  b END
+
+PRE_LOOP_STAGES_7_OR_8:
+  add r4, r3, r4, asl #1
+
+LOOP_STAGES_7_OR_8:
+  ldrsh r2, [r3], #2              @ index[m]
+  ldrsh r5, [r3], #2              @ index[m + 1]
+  ldr r1, [r0, r2]                @ complex_data[index[m], index[m] + 1]
+  ldr r12, [r0, r5]               @ complex_data[index[m + 1], index[m + 1] + 1]
+  cmp r3, r4
+  str r1, [r0, r5]
+  str r12, [r0, r2]
+  bne LOOP_STAGES_7_OR_8
+
+END:
+  pop {r4-r7}
+  bx lr
+
+@ The index tables. Note the values are doubles of the actual indexes for 16-bit
+@ elements, different from the generic C code. It actually provides byte offsets
+@ for the indexes.
+
+.align  2
+index_7:  @ Indexes for stages == 7.
+  .short 4, 256, 8, 128, 12, 384, 16, 64, 20, 320, 24, 192, 28, 448, 36, 288
+  .short 40, 160, 44, 416, 48, 96, 52, 352, 56, 224, 60, 480, 68, 272, 72, 144
+  .short 76, 400, 84, 336, 88, 208, 92, 464, 100, 304, 104, 176, 108, 432, 116
+  .short 368, 120, 240, 124, 496, 132, 264, 140, 392, 148, 328, 152, 200, 156
+  .short 456, 164, 296, 172, 424, 180, 360, 184, 232, 188, 488, 196, 280, 204
+  .short 408, 212, 344, 220, 472, 228, 312, 236, 440, 244, 376, 252, 504, 268
+  .short 388, 276, 324, 284, 452, 300, 420, 308, 356, 316, 484, 332, 404, 348
+  .short 468, 364, 436, 380, 500, 412, 460, 444, 492
+
+index_8:  @ Indexes for stages == 8.
+  .short 4, 512, 8, 256, 12, 768, 16, 128, 20, 640, 24, 384, 28, 896, 32, 64
+  .short 36, 576, 40, 320, 44, 832, 48, 192, 52, 704, 56, 448, 60, 960, 68, 544
+  .short 72, 288, 76, 800, 80, 160, 84, 672, 88, 416, 92, 928, 100, 608, 104
+  .short 352, 108, 864, 112, 224, 116, 736, 120, 480, 124, 992, 132, 528, 136
+  .short 272, 140, 784, 148, 656, 152, 400, 156, 912, 164, 592, 168, 336, 172
+  .short 848, 176, 208, 180, 720, 184, 464, 188, 976, 196, 560, 200, 304, 204
+  .short 816, 212, 688, 216, 432, 220, 944, 228, 624, 232, 368, 236, 880, 244
+  .short 752, 248, 496, 252, 1008, 260, 520, 268, 776, 276, 648, 280, 392, 284
+  .short 904, 292, 584, 296, 328, 300, 840, 308, 712, 312, 456, 316, 968, 324
+  .short 552, 332, 808, 340, 680, 344, 424, 348, 936, 356, 616, 364, 872, 372
+  .short 744, 376, 488, 380, 1000, 388, 536, 396, 792, 404, 664, 412, 920, 420
+  .short 600, 428, 856, 436, 728, 440, 472, 444, 984, 452, 568, 460, 824, 468
+  .short 696, 476, 952, 484, 632, 492, 888, 500, 760, 508, 1016, 524, 772, 532
+  .short 644, 540, 900, 548, 580, 556, 836, 564, 708, 572, 964, 588, 804, 596
+  .short 676, 604, 932, 620, 868, 628, 740, 636, 996, 652, 788, 668, 916, 684
+  .short 852, 692, 724, 700, 980, 716, 820, 732, 948, 748, 884, 764, 1012, 796
+  .short 908, 812, 844, 828, 972, 860, 940, 892, 1004, 956, 988
diff --git a/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_mips.c b/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_mips.c
new file mode 100644
index 0000000000..9007b19cf6
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/complex_bit_reverse_mips.c
@@ -0,0 +1,176 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+static int16_t coefTable_7[] = {
+    4, 256,   8, 128,  12, 384,  16,  64,
+   20, 320,  24, 192,  28, 448,  36, 288,
+   40, 160,  44, 416,  48,  96,  52, 352,
+   56, 224,  60, 480,  68, 272,  72, 144,
+   76, 400,  84, 336,  88, 208,  92, 464,
+  100, 304, 104, 176, 108, 432, 116, 368,
+  120, 240, 124, 496, 132, 264, 140, 392,
+  148, 328, 152, 200, 156, 456, 164, 296,
+  172, 424, 180, 360, 184, 232, 188, 488,
+  196, 280, 204, 408, 212, 344, 220, 472,
+  228, 312, 236, 440, 244, 376, 252, 504,
+  268, 388, 276, 324, 284, 452, 300, 420,
+  308, 356, 316, 484, 332, 404, 348, 468,
+  364, 436, 380, 500, 412, 460, 444, 492
+};
+
+static int16_t coefTable_8[] = {
+    4,  512,    8,  256,   12,  768,   16,  128,
+   20,  640,   24,  384,   28,  896,   32,   64,
+   36,  576,   40,  320,   44,  832,   48,  192,
+   52,  704,   56,  448,   60,  960,   68,  544,
+   72,  288,   76,  800,   80,  160,   84,  672,
+   88,  416,   92,  928,  100,  608,  104,  352,
+  108,  864,  112,  224,  116,  736,  120,  480,
+  124,  992,  132,  528,  136,  272,  140,  784,
+  148,  656,  152,  400,  156,  912,  164,  592,
+  168,  336,  172,  848,  176,  208,  180,  720,
+  184,  464,  188,  976,  196,  560,  200,  304,
+  204,  816,  212,  688,  216,  432,  220,  944,
+  228,  624,  232,  368,  236,  880,  244,  752,
+  248,  496,  252, 1008,  260,  520,  268,  776,
+  276,  648,  280,  392,  284,  904,  292,  584,
+  296,  328,  300,  840,  308,  712,  312,  456,
+  316,  968,  324,  552,  332,  808,  340,  680,
+  344,  424,  348,  936,  356,  616,  364,  872,
+  372,  744,  376,  488,  380, 1000,  388,  536,
+  396,  792,  404,  664,  412,  920,  420,  600,
+  428,  856,  436,  728,  440,  472,  444,  984,
+  452,  568,  460,  824,  468,  696,  476,  952,
+  484,  632,  492,  888,  500,  760,  508, 1016,
+  524,  772,  532,  644,  540,  900,  548,  580,
+  556,  836,  564,  708,  572,  964,  588,  804,
+  596,  676,  604,  932,  620,  868,  628,  740,
+  636,  996,  652,  788,  668,  916,  684,  852,
+  692,  724,  700,  980,  716,  820,  732,  948,
+  748,  884,  764, 1012,  796,  908,  812,  844,
+  828,  972,  860,  940,  892, 1004,  956,  988
+};
+
+void WebRtcSpl_ComplexBitReverse(int16_t frfi[], int stages) {
+  int l;
+  int16_t tr, ti;
+  int32_t tmp1, tmp2, tmp3, tmp4;
+  int32_t* ptr_i;
+  int32_t* ptr_j;
+
+  if (stages == 8) {
+    int16_t* pcoeftable_8 = coefTable_8;
+
+    __asm __volatile (
+      ".set         push                                             \n\t"
+      ".set         noreorder                                        \n\t"
+      "addiu        %[l],            $zero,               120        \n\t"
+     "1:                                                             \n\t"
+      "addiu        %[l],            %[l],                -4         \n\t"
+      "lh           %[tr],           0(%[pcoeftable_8])              \n\t"
+      "lh           %[ti],           2(%[pcoeftable_8])              \n\t"
+      "lh           %[tmp3],         4(%[pcoeftable_8])              \n\t"
+      "lh           %[tmp4],         6(%[pcoeftable_8])              \n\t"
+      "addu         %[ptr_i],        %[frfi],             %[tr]      \n\t"
+      "addu         %[ptr_j],        %[frfi],             %[ti]      \n\t"
+      "addu         %[tr],           %[frfi],             %[tmp3]    \n\t"
+      "addu         %[ti],           %[frfi],             %[tmp4]    \n\t"
+      "ulw          %[tmp1],         0(%[ptr_i])                     \n\t"
+      "ulw          %[tmp2],         0(%[ptr_j])                     \n\t"
+      "ulw          %[tmp3],         0(%[tr])                        \n\t"
+      "ulw          %[tmp4],         0(%[ti])                        \n\t"
+      "usw          %[tmp1],         0(%[ptr_j])                     \n\t"
+      "usw          %[tmp2],         0(%[ptr_i])                     \n\t"
+      "usw          %[tmp4],         0(%[tr])                        \n\t"
+      "usw          %[tmp3],         0(%[ti])                        \n\t"
+      "lh           %[tmp1],         8(%[pcoeftable_8])              \n\t"
+      "lh           %[tmp2],         10(%[pcoeftable_8])             \n\t"
+      "lh           %[tr],           12(%[pcoeftable_8])             \n\t"
+      "lh           %[ti],           14(%[pcoeftable_8])             \n\t"
+      "addu         %[ptr_i],        %[frfi],             %[tmp1]    \n\t"
+      "addu         %[ptr_j],        %[frfi],             %[tmp2]    \n\t"
+      "addu         %[tr],           %[frfi],             %[tr]      \n\t"
+      "addu         %[ti],           %[frfi],             %[ti]      \n\t"
+      "ulw          %[tmp1],         0(%[ptr_i])                     \n\t"
+      "ulw          %[tmp2],         0(%[ptr_j])                     \n\t"
+      "ulw          %[tmp3],         0(%[tr])                        \n\t"
+      "ulw          %[tmp4],         0(%[ti])                        \n\t"
+      "usw          %[tmp1],         0(%[ptr_j])                     \n\t"
+      "usw          %[tmp2],         0(%[ptr_i])                     \n\t"
+      "usw          %[tmp4],         0(%[tr])                        \n\t"
+      "usw          %[tmp3],         0(%[ti])                        \n\t"
+      "bgtz         %[l],            1b                              \n\t"
+      " addiu       %[pcoeftable_8], %[pcoeftable_8],     16         \n\t"
+      ".set         pop                                              \n\t"
+
+      : [tmp1] "=&r" (tmp1), [tmp2] "=&r" (tmp2), [ptr_i] "=&r" (ptr_i),
+        [ptr_j] "=&r" (ptr_j), [tr] "=&r" (tr), [l] "=&r" (l),
+        [tmp3] "=&r" (tmp3), [pcoeftable_8] "+r" (pcoeftable_8),
+        [ti] "=&r" (ti), [tmp4] "=&r" (tmp4)
+      : [frfi] "r" (frfi)
+      : "memory"
+    );
+  } else if (stages == 7) {
+    int16_t* pcoeftable_7 = coefTable_7;
+
+    __asm __volatile (
+      ".set push                                                     \n\t"
+      ".set noreorder                                                \n\t"
+      "addiu        %[l],            $zero,               56         \n\t"
+     "1:                                                             \n\t"
+      "addiu        %[l],            %[l],                -4         \n\t"
+      "lh           %[tr],           0(%[pcoeftable_7])              \n\t"
+      "lh           %[ti],           2(%[pcoeftable_7])              \n\t"
+      "lh           %[tmp3],         4(%[pcoeftable_7])              \n\t"
+      "lh           %[tmp4],         6(%[pcoeftable_7])              \n\t"
+      "addu         %[ptr_i],        %[frfi],             %[tr]      \n\t"
+      "addu         %[ptr_j],        %[frfi],             %[ti]      \n\t"
+      "addu         %[tr],           %[frfi],             %[tmp3]    \n\t"
+      "addu         %[ti],           %[frfi],             %[tmp4]    \n\t"
+      "ulw          %[tmp1],         0(%[ptr_i])                     \n\t"
+      "ulw          %[tmp2],         0(%[ptr_j])                     \n\t"
+      "ulw          %[tmp3],         0(%[tr])                        \n\t"
+      "ulw          %[tmp4],         0(%[ti])                        \n\t"
+      "usw          %[tmp1],         0(%[ptr_j])                     \n\t"
+      "usw          %[tmp2],         0(%[ptr_i])                     \n\t"
+      "usw          %[tmp4],         0(%[tr])                        \n\t"
+      "usw          %[tmp3],         0(%[ti])                        \n\t"
+      "lh           %[tmp1],         8(%[pcoeftable_7])              \n\t"
+      "lh           %[tmp2],         10(%[pcoeftable_7])             \n\t"
+      "lh           %[tr],           12(%[pcoeftable_7])             \n\t"
+      "lh           %[ti],           14(%[pcoeftable_7])             \n\t"
+      "addu         %[ptr_i],        %[frfi],             %[tmp1]    \n\t"
+      "addu         %[ptr_j],        %[frfi],             %[tmp2]    \n\t"
+      "addu         %[tr],           %[frfi],             %[tr]      \n\t"
+      "addu         %[ti],           %[frfi],             %[ti]      \n\t"
+      "ulw          %[tmp1],         0(%[ptr_i])                     \n\t"
+      "ulw          %[tmp2],         0(%[ptr_j])                     \n\t"
+      "ulw          %[tmp3],         0(%[tr])                        \n\t"
+      "ulw          %[tmp4],         0(%[ti])                        \n\t"
+      "usw          %[tmp1],         0(%[ptr_j])                     \n\t"
+      "usw          %[tmp2],         0(%[ptr_i])                     \n\t"
+      "usw          %[tmp4],         0(%[tr])                        \n\t"
+      "usw          %[tmp3],         0(%[ti])                        \n\t"
+      "bgtz         %[l],            1b                              \n\t"
+      " addiu       %[pcoeftable_7], %[pcoeftable_7],     16         \n\t"
+      ".set pop                                                      \n\t"
+
+      : [tmp1] "=&r" (tmp1), [tmp2] "=&r" (tmp2), [ptr_i] "=&r" (ptr_i),
+        [ptr_j] "=&r" (ptr_j), [ti] "=&r" (ti), [tr] "=&r" (tr),
+        [l] "=&r" (l), [pcoeftable_7] "+r" (pcoeftable_7),
+        [tmp3] "=&r" (tmp3), [tmp4] "=&r" (tmp4)
+      : [frfi] "r" (frfi)
+      : "memory"
+    );
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c b/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c
new file mode 100644
index 0000000000..ddc9a97b59
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/complex_fft.c
@@ -0,0 +1,299 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_ComplexFFT().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/complex_fft_tables.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/system/arch.h"
+
+#define CFFTSFT 14
+#define CFFTRND 1
+#define CFFTRND2 16384
+
+#define CIFFTSFT 14
+#define CIFFTRND 1
+
+
+int WebRtcSpl_ComplexFFT(int16_t frfi[], int stages, int mode)
+{
+    int i, j, l, k, istep, n, m;
+    int16_t wr, wi;
+    int32_t tr32, ti32, qr32, qi32;
+
+    /* The 1024-value is a constant given from the size of kSinTable1024[],
+     * and should not be changed depending on the input parameter 'stages'
+     */
+    n = 1 << stages;
+    if (n > 1024)
+        return -1;
+
+    l = 1;
+    k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
+         depending on the input parameter 'stages' */
+
+    if (mode == 0)
+    {
+        // mode==0: Low-complexity and Low-accuracy mode
+        while (l < n)
+        {
+            istep = l << 1;
+
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = -kSinTable1024[j];
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+                    tr32 = (wr * frfi[2 * j] - wi * frfi[2 * j + 1]) >> 15;
+
+                    ti32 = (wr * frfi[2 * j + 1] + wi * frfi[2 * j]) >> 15;
+
+                    qr32 = (int32_t)frfi[2 * i];
+                    qi32 = (int32_t)frfi[2 * i + 1];
+                    frfi[2 * j] = (int16_t)((qr32 - tr32) >> 1);
+                    frfi[2 * j + 1] = (int16_t)((qi32 - ti32) >> 1);
+                    frfi[2 * i] = (int16_t)((qr32 + tr32) >> 1);
+                    frfi[2 * i + 1] = (int16_t)((qi32 + ti32) >> 1);
+                }
+            }
+
+            --k;
+            l = istep;
+
+        }
+
+    } else
+    {
+        // mode==1: High-complexity and High-accuracy mode
+        while (l < n)
+        {
+            istep = l << 1;
+
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = -kSinTable1024[j];
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                int32_t wri = 0;
+                __asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
+                    "r"((int32_t)wr), "r"((int32_t)wi));
+#endif
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                    register int32_t frfi_r;
+                    __asm __volatile(
+                        "pkhbt %[frfi_r], %[frfi_even], %[frfi_odd],"
+                        " lsl #16\n\t"
+                        "smlsd %[tr32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
+                        "smladx %[ti32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
+                        :[frfi_r]"=&r"(frfi_r),
+                         [tr32]"=&r"(tr32),
+                         [ti32]"=r"(ti32)
+                        :[frfi_even]"r"((int32_t)frfi[2*j]),
+                         [frfi_odd]"r"((int32_t)frfi[2*j +1]),
+                         [wri]"r"(wri),
+                         [cfftrnd]"r"(CFFTRND));
+#else
+                    tr32 = wr * frfi[2 * j] - wi * frfi[2 * j + 1] + CFFTRND;
+
+                    ti32 = wr * frfi[2 * j + 1] + wi * frfi[2 * j] + CFFTRND;
+#endif
+
+                    tr32 >>= 15 - CFFTSFT;
+                    ti32 >>= 15 - CFFTSFT;
+
+                    qr32 = ((int32_t)frfi[2 * i]) * (1 << CFFTSFT);
+                    qi32 = ((int32_t)frfi[2 * i + 1]) * (1 << CFFTSFT);
+
+                    frfi[2 * j] = (int16_t)(
+                        (qr32 - tr32 + CFFTRND2) >> (1 + CFFTSFT));
+                    frfi[2 * j + 1] = (int16_t)(
+                        (qi32 - ti32 + CFFTRND2) >> (1 + CFFTSFT));
+                    frfi[2 * i] = (int16_t)(
+                        (qr32 + tr32 + CFFTRND2) >> (1 + CFFTSFT));
+                    frfi[2 * i + 1] = (int16_t)(
+                        (qi32 + ti32 + CFFTRND2) >> (1 + CFFTSFT));
+                }
+            }
+
+            --k;
+            l = istep;
+        }
+    }
+    return 0;
+}
+
+int WebRtcSpl_ComplexIFFT(int16_t frfi[], int stages, int mode)
+{
+    size_t i, j, l, istep, n, m;
+    int k, scale, shift;
+    int16_t wr, wi;
+    int32_t tr32, ti32, qr32, qi32;
+    int32_t tmp32, round2;
+
+    /* The 1024-value is a constant given from the size of kSinTable1024[],
+     * and should not be changed depending on the input parameter 'stages'
+     */
+    n = ((size_t)1) << stages;
+    if (n > 1024)
+        return -1;
+
+    scale = 0;
+
+    l = 1;
+    k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
+         depending on the input parameter 'stages' */
+
+    while (l < n)
+    {
+        // variable scaling, depending upon data
+        shift = 0;
+        round2 = 8192;
+
+        tmp32 = WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
+        if (tmp32 > 13573)
+        {
+            shift++;
+            scale++;
+            round2 <<= 1;
+        }
+        if (tmp32 > 27146)
+        {
+            shift++;
+            scale++;
+            round2 <<= 1;
+        }
+
+        istep = l << 1;
+
+        if (mode == 0)
+        {
+            // mode==0: Low-complexity and Low-accuracy mode
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = kSinTable1024[j];
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+                    tr32 = (wr * frfi[2 * j] - wi * frfi[2 * j + 1]) >> 15;
+
+                    ti32 = (wr * frfi[2 * j + 1] + wi * frfi[2 * j]) >> 15;
+
+                    qr32 = (int32_t)frfi[2 * i];
+                    qi32 = (int32_t)frfi[2 * i + 1];
+                    frfi[2 * j] = (int16_t)((qr32 - tr32) >> shift);
+                    frfi[2 * j + 1] = (int16_t)((qi32 - ti32) >> shift);
+                    frfi[2 * i] = (int16_t)((qr32 + tr32) >> shift);
+                    frfi[2 * i + 1] = (int16_t)((qi32 + ti32) >> shift);
+                }
+            }
+        } else
+        {
+            // mode==1: High-complexity and High-accuracy mode
+
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = kSinTable1024[j];
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                int32_t wri = 0;
+                __asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
+                    "r"((int32_t)wr), "r"((int32_t)wi));
+#endif
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                    register int32_t frfi_r;
+                    __asm __volatile(
+                      "pkhbt %[frfi_r], %[frfi_even], %[frfi_odd], lsl #16\n\t"
+                      "smlsd %[tr32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
+                      "smladx %[ti32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
+                      :[frfi_r]"=&r"(frfi_r),
+                       [tr32]"=&r"(tr32),
+                       [ti32]"=r"(ti32)
+                      :[frfi_even]"r"((int32_t)frfi[2*j]),
+                       [frfi_odd]"r"((int32_t)frfi[2*j +1]),
+                       [wri]"r"(wri),
+                       [cifftrnd]"r"(CIFFTRND)
+                    );
+#else
+
+                    tr32 = wr * frfi[2 * j] - wi * frfi[2 * j + 1] + CIFFTRND;
+
+                    ti32 = wr * frfi[2 * j + 1] + wi * frfi[2 * j] + CIFFTRND;
+#endif
+                    tr32 >>= 15 - CIFFTSFT;
+                    ti32 >>= 15 - CIFFTSFT;
+
+                    qr32 = ((int32_t)frfi[2 * i]) * (1 << CIFFTSFT);
+                    qi32 = ((int32_t)frfi[2 * i + 1]) * (1 << CIFFTSFT);
+
+                    frfi[2 * j] = (int16_t)(
+                        (qr32 - tr32 + round2) >> (shift + CIFFTSFT));
+                    frfi[2 * j + 1] = (int16_t)(
+                        (qi32 - ti32 + round2) >> (shift + CIFFTSFT));
+                    frfi[2 * i] = (int16_t)(
+                        (qr32 + tr32 + round2) >> (shift + CIFFTSFT));
+                    frfi[2 * i + 1] = (int16_t)(
+                        (qi32 + ti32 + round2) >> (shift + CIFFTSFT));
+                }
+            }
+
+        }
+        --k;
+        l = istep;
+    }
+    return scale;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/complex_fft_mips.c b/third_party/libwebrtc/common_audio/signal_processing/complex_fft_mips.c
new file mode 100644
index 0000000000..27071f8b39
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/complex_fft_mips.c
@@ -0,0 +1,328 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include "common_audio/signal_processing/complex_fft_tables.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#define CFFTSFT 14
+#define CFFTRND 1
+#define CFFTRND2 16384
+
+#define CIFFTSFT 14
+#define CIFFTRND 1
+
+int WebRtcSpl_ComplexFFT(int16_t frfi[], int stages, int mode) {
+  int i = 0;
+  int l = 0;
+  int k = 0;
+  int istep = 0;
+  int n = 0;
+  int m = 0;
+  int32_t wr = 0, wi = 0;
+  int32_t tmp1 = 0;
+  int32_t tmp2 = 0;
+  int32_t tmp3 = 0;
+  int32_t tmp4 = 0;
+  int32_t tmp5 = 0;
+  int32_t tmp6 = 0;
+  int32_t tmp = 0;
+  int16_t* ptr_j = NULL;
+  int16_t* ptr_i = NULL;
+
+  n = 1 << stages;
+  if (n > 1024) {
+    return -1;
+  }
+
+  __asm __volatile (
+    ".set push                                                         \n\t"
+    ".set noreorder                                                    \n\t"
+
+    "addiu      %[k],           $zero,            10                   \n\t"
+    "addiu      %[l],           $zero,            1                    \n\t"
+   "3:                                                                 \n\t"
+    "sll        %[istep],       %[l],             1                    \n\t"
+    "move       %[m],           $zero                                  \n\t"
+    "sll        %[tmp],         %[l],             2                    \n\t"
+    "move       %[i],           $zero                                  \n\t"
+   "2:                                                                 \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "sllv       %[tmp3],        %[m],             %[k]                 \n\t"
+    "addiu      %[tmp2],        %[tmp3],          512                  \n\t"
+    "addiu      %[m],           %[m],             1                    \n\t"
+    "lhx        %[wi],          %[tmp3](%[kSinTable1024])              \n\t"
+    "lhx        %[wr],          %[tmp2](%[kSinTable1024])              \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "sllv       %[tmp3],        %[m],             %[k]                 \n\t"
+    "addu       %[ptr_j],       %[tmp3],          %[kSinTable1024]     \n\t"
+    "addiu      %[ptr_i],       %[ptr_j],         512                  \n\t"
+    "addiu      %[m],           %[m],             1                    \n\t"
+    "lh         %[wi],          0(%[ptr_j])                            \n\t"
+    "lh         %[wr],          0(%[ptr_i])                            \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+   "1:                                                                 \n\t"
+    "sll        %[tmp1],        %[i],             2                    \n\t"
+    "addu       %[ptr_i],       %[frfi],          %[tmp1]              \n\t"
+    "addu       %[ptr_j],       %[ptr_i],         %[tmp]               \n\t"
+    "lh         %[tmp6],        0(%[ptr_i])                            \n\t"
+    "lh         %[tmp5],        2(%[ptr_i])                            \n\t"
+    "lh         %[tmp3],        0(%[ptr_j])                            \n\t"
+    "lh         %[tmp4],        2(%[ptr_j])                            \n\t"
+    "addu       %[i],           %[i],             %[istep]             \n\t"
+#if defined(MIPS_DSP_R2_LE)
+    "mult       %[wr],          %[tmp3]                                \n\t"
+    "madd       %[wi],          %[tmp4]                                \n\t"
+    "mult       $ac1,           %[wr],            %[tmp4]              \n\t"
+    "msub       $ac1,           %[wi],            %[tmp3]              \n\t"
+    "mflo       %[tmp1]                                                \n\t"
+    "mflo       %[tmp2],        $ac1                                   \n\t"
+    "sll        %[tmp6],        %[tmp6],          14                   \n\t"
+    "sll        %[tmp5],        %[tmp5],          14                   \n\t"
+    "shra_r.w   %[tmp1],        %[tmp1],          1                    \n\t"
+    "shra_r.w   %[tmp2],        %[tmp2],          1                    \n\t"
+    "subu       %[tmp4],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp1],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp6],        %[tmp5],          %[tmp2]              \n\t"
+    "subu       %[tmp5],        %[tmp5],          %[tmp2]              \n\t"
+    "shra_r.w   %[tmp1],        %[tmp1],          15                   \n\t"
+    "shra_r.w   %[tmp6],        %[tmp6],          15                   \n\t"
+    "shra_r.w   %[tmp4],        %[tmp4],          15                   \n\t"
+    "shra_r.w   %[tmp5],        %[tmp5],          15                   \n\t"
+#else  // #if defined(MIPS_DSP_R2_LE)
+    "mul        %[tmp2],        %[wr],            %[tmp4]              \n\t"
+    "mul        %[tmp1],        %[wr],            %[tmp3]              \n\t"
+    "mul        %[tmp4],        %[wi],            %[tmp4]              \n\t"
+    "mul        %[tmp3],        %[wi],            %[tmp3]              \n\t"
+    "sll        %[tmp6],        %[tmp6],          14                   \n\t"
+    "sll        %[tmp5],        %[tmp5],          14                   \n\t"
+    "addiu      %[tmp6],        %[tmp6],          16384                \n\t"
+    "addiu      %[tmp5],        %[tmp5],          16384                \n\t"
+    "addu       %[tmp1],        %[tmp1],          %[tmp4]              \n\t"
+    "subu       %[tmp2],        %[tmp2],          %[tmp3]              \n\t"
+    "addiu      %[tmp1],        %[tmp1],          1                    \n\t"
+    "addiu      %[tmp2],        %[tmp2],          1                    \n\t"
+    "sra        %[tmp1],        %[tmp1],          1                    \n\t"
+    "sra        %[tmp2],        %[tmp2],          1                    \n\t"
+    "subu       %[tmp4],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp1],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp6],        %[tmp5],          %[tmp2]              \n\t"
+    "subu       %[tmp5],        %[tmp5],          %[tmp2]              \n\t"
+    "sra        %[tmp4],        %[tmp4],          15                   \n\t"
+    "sra        %[tmp1],        %[tmp1],          15                   \n\t"
+    "sra        %[tmp6],        %[tmp6],          15                   \n\t"
+    "sra        %[tmp5],        %[tmp5],          15                   \n\t"
+#endif  // #if defined(MIPS_DSP_R2_LE)
+    "sh         %[tmp1],        0(%[ptr_i])                            \n\t"
+    "sh         %[tmp6],        2(%[ptr_i])                            \n\t"
+    "sh         %[tmp4],        0(%[ptr_j])                            \n\t"
+    "blt        %[i],           %[n],             1b                   \n\t"
+    " sh        %[tmp5],        2(%[ptr_j])                            \n\t"
+    "blt        %[m],           %[l],             2b                   \n\t"
+    " addu      %[i],           $zero,            %[m]                 \n\t"
+    "move       %[l],           %[istep]                               \n\t"
+    "blt        %[l],           %[n],             3b                   \n\t"
+    " addiu     %[k],           %[k],             -1                   \n\t"
+
+    ".set pop                                                          \n\t"
+
+    : [tmp1] "=&r" (tmp1), [tmp2] "=&r" (tmp2), [tmp3] "=&r" (tmp3),
+      [tmp4] "=&r" (tmp4), [tmp5] "=&r" (tmp5), [tmp6] "=&r" (tmp6),
+      [ptr_i] "=&r" (ptr_i), [i] "=&r" (i), [wi] "=&r" (wi), [wr] "=&r" (wr),
+      [m] "=&r" (m), [istep] "=&r" (istep), [l] "=&r" (l), [k] "=&r" (k),
+      [ptr_j] "=&r" (ptr_j), [tmp] "=&r" (tmp)
+    : [n] "r" (n), [frfi] "r" (frfi), [kSinTable1024] "r" (kSinTable1024)
+    : "hi", "lo", "memory"
+#if defined(MIPS_DSP_R2_LE)
+    , "$ac1hi", "$ac1lo"
+#endif  // #if defined(MIPS_DSP_R2_LE)
+  );
+
+  return 0;
+}
+
+int WebRtcSpl_ComplexIFFT(int16_t frfi[], int stages, int mode) {
+  int i = 0, l = 0, k = 0;
+  int istep = 0, n = 0, m = 0;
+  int scale = 0, shift = 0;
+  int32_t wr = 0, wi = 0;
+  int32_t tmp1 = 0, tmp2 = 0, tmp3 = 0, tmp4 = 0;
+  int32_t tmp5 = 0, tmp6 = 0, tmp = 0, tempMax = 0, round2 = 0;
+  int16_t* ptr_j = NULL;
+  int16_t* ptr_i = NULL;
+
+  n = 1 << stages;
+  if (n > 1024) {
+    return -1;
+  }
+
+  __asm __volatile (
+    ".set push                                                         \n\t"
+    ".set noreorder                                                    \n\t"
+
+    "addiu      %[k],           $zero,            10                   \n\t"
+    "addiu      %[l],           $zero,            1                    \n\t"
+    "move       %[scale],       $zero                                  \n\t"
+   "3:                                                                 \n\t"
+    "addiu      %[shift],       $zero,            14                   \n\t"
+    "addiu      %[round2],      $zero,            8192                 \n\t"
+    "move       %[ptr_i],       %[frfi]                                \n\t"
+    "move       %[tempMax],     $zero                                  \n\t"
+    "addu       %[i],           %[n],             %[n]                 \n\t"
+   "5:                                                                 \n\t"
+    "lh         %[tmp1],        0(%[ptr_i])                            \n\t"
+    "lh         %[tmp2],        2(%[ptr_i])                            \n\t"
+    "lh         %[tmp3],        4(%[ptr_i])                            \n\t"
+    "lh         %[tmp4],        6(%[ptr_i])                            \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "absq_s.w   %[tmp1],        %[tmp1]                                \n\t"
+    "absq_s.w   %[tmp2],        %[tmp2]                                \n\t"
+    "absq_s.w   %[tmp3],        %[tmp3]                                \n\t"
+    "absq_s.w   %[tmp4],        %[tmp4]                                \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "slt        %[tmp5],        %[tmp1],          $zero                \n\t"
+    "subu       %[tmp6],        $zero,            %[tmp1]              \n\t"
+    "movn       %[tmp1],        %[tmp6],          %[tmp5]              \n\t"
+    "slt        %[tmp5],        %[tmp2],          $zero                \n\t"
+    "subu       %[tmp6],        $zero,            %[tmp2]              \n\t"
+    "movn       %[tmp2],        %[tmp6],          %[tmp5]              \n\t"
+    "slt        %[tmp5],        %[tmp3],          $zero                \n\t"
+    "subu       %[tmp6],        $zero,            %[tmp3]              \n\t"
+    "movn       %[tmp3],        %[tmp6],          %[tmp5]              \n\t"
+    "slt        %[tmp5],        %[tmp4],          $zero                \n\t"
+    "subu       %[tmp6],        $zero,            %[tmp4]              \n\t"
+    "movn       %[tmp4],        %[tmp6],          %[tmp5]              \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+    "slt        %[tmp5],        %[tempMax],       %[tmp1]              \n\t"
+    "movn       %[tempMax],     %[tmp1],          %[tmp5]              \n\t"
+    "addiu      %[i],           %[i],             -4                   \n\t"
+    "slt        %[tmp5],        %[tempMax],       %[tmp2]              \n\t"
+    "movn       %[tempMax],     %[tmp2],          %[tmp5]              \n\t"
+    "slt        %[tmp5],        %[tempMax],       %[tmp3]              \n\t"
+    "movn       %[tempMax],     %[tmp3],          %[tmp5]              \n\t"
+    "slt        %[tmp5],        %[tempMax],       %[tmp4]              \n\t"
+    "movn       %[tempMax],     %[tmp4],          %[tmp5]              \n\t"
+    "bgtz       %[i],                             5b                   \n\t"
+    " addiu     %[ptr_i],       %[ptr_i],         8                    \n\t"
+    "addiu      %[tmp1],        $zero,            13573                \n\t"
+    "addiu      %[tmp2],        $zero,            27146                \n\t"
+#if !defined(MIPS32_R2_LE)
+    "sll        %[tempMax],     %[tempMax],       16                   \n\t"
+    "sra        %[tempMax],     %[tempMax],       16                   \n\t"
+#else  // #if !defined(MIPS32_R2_LE)
+    "seh        %[tempMax]                                             \n\t"
+#endif  // #if !defined(MIPS32_R2_LE)
+    "slt        %[tmp1],        %[tmp1],          %[tempMax]           \n\t"
+    "slt        %[tmp2],        %[tmp2],          %[tempMax]           \n\t"
+    "addu       %[tmp1],        %[tmp1],          %[tmp2]              \n\t"
+    "addu       %[shift],       %[shift],         %[tmp1]              \n\t"
+    "addu       %[scale],       %[scale],         %[tmp1]              \n\t"
+    "sllv       %[round2],      %[round2],        %[tmp1]              \n\t"
+    "sll        %[istep],       %[l],             1                    \n\t"
+    "move       %[m],           $zero                                  \n\t"
+    "sll        %[tmp],         %[l],             2                    \n\t"
+   "2:                                                                 \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "sllv       %[tmp3],        %[m],             %[k]                 \n\t"
+    "addiu      %[tmp2],        %[tmp3],          512                  \n\t"
+    "addiu      %[m],           %[m],             1                    \n\t"
+    "lhx        %[wi],          %[tmp3](%[kSinTable1024])              \n\t"
+    "lhx        %[wr],          %[tmp2](%[kSinTable1024])              \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "sllv       %[tmp3],        %[m],             %[k]                 \n\t"
+    "addu       %[ptr_j],       %[tmp3],          %[kSinTable1024]     \n\t"
+    "addiu      %[ptr_i],       %[ptr_j],         512                  \n\t"
+    "addiu      %[m],           %[m],             1                    \n\t"
+    "lh         %[wi],          0(%[ptr_j])                            \n\t"
+    "lh         %[wr],          0(%[ptr_i])                            \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+   "1:                                                                 \n\t"
+    "sll        %[tmp1],        %[i],             2                    \n\t"
+    "addu       %[ptr_i],       %[frfi],          %[tmp1]              \n\t"
+    "addu       %[ptr_j],       %[ptr_i],         %[tmp]               \n\t"
+    "lh         %[tmp3],        0(%[ptr_j])                            \n\t"
+    "lh         %[tmp4],        2(%[ptr_j])                            \n\t"
+    "lh         %[tmp6],        0(%[ptr_i])                            \n\t"
+    "lh         %[tmp5],        2(%[ptr_i])                            \n\t"
+    "addu       %[i],           %[i],             %[istep]             \n\t"
+#if defined(MIPS_DSP_R2_LE)
+    "mult       %[wr],          %[tmp3]                                \n\t"
+    "msub       %[wi],          %[tmp4]                                \n\t"
+    "mult       $ac1,           %[wr],            %[tmp4]              \n\t"
+    "madd       $ac1,           %[wi],            %[tmp3]              \n\t"
+    "mflo       %[tmp1]                                                \n\t"
+    "mflo       %[tmp2],        $ac1                                   \n\t"
+    "sll        %[tmp6],        %[tmp6],          14                   \n\t"
+    "sll        %[tmp5],        %[tmp5],          14                   \n\t"
+    "shra_r.w   %[tmp1],        %[tmp1],          1                    \n\t"
+    "shra_r.w   %[tmp2],        %[tmp2],          1                    \n\t"
+    "addu       %[tmp6],        %[tmp6],          %[round2]            \n\t"
+    "addu       %[tmp5],        %[tmp5],          %[round2]            \n\t"
+    "subu       %[tmp4],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp1],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp6],        %[tmp5],          %[tmp2]              \n\t"
+    "subu       %[tmp5],        %[tmp5],          %[tmp2]              \n\t"
+    "srav       %[tmp4],        %[tmp4],          %[shift]             \n\t"
+    "srav       %[tmp1],        %[tmp1],          %[shift]             \n\t"
+    "srav       %[tmp6],        %[tmp6],          %[shift]             \n\t"
+    "srav       %[tmp5],        %[tmp5],          %[shift]             \n\t"
+#else  // #if defined(MIPS_DSP_R2_LE)
+    "mul        %[tmp1],        %[wr],            %[tmp3]              \n\t"
+    "mul        %[tmp2],        %[wr],            %[tmp4]              \n\t"
+    "mul        %[tmp4],        %[wi],            %[tmp4]              \n\t"
+    "mul        %[tmp3],        %[wi],            %[tmp3]              \n\t"
+    "sll        %[tmp6],        %[tmp6],          14                   \n\t"
+    "sll        %[tmp5],        %[tmp5],          14                   \n\t"
+    "sub        %[tmp1],        %[tmp1],          %[tmp4]              \n\t"
+    "addu       %[tmp2],        %[tmp2],          %[tmp3]              \n\t"
+    "addiu      %[tmp1],        %[tmp1],          1                    \n\t"
+    "addiu      %[tmp2],        %[tmp2],          1                    \n\t"
+    "sra        %[tmp2],        %[tmp2],          1                    \n\t"
+    "sra        %[tmp1],        %[tmp1],          1                    \n\t"
+    "addu       %[tmp6],        %[tmp6],          %[round2]            \n\t"
+    "addu       %[tmp5],        %[tmp5],          %[round2]            \n\t"
+    "subu       %[tmp4],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp1],        %[tmp6],          %[tmp1]              \n\t"
+    "addu       %[tmp6],        %[tmp5],          %[tmp2]              \n\t"
+    "subu       %[tmp5],        %[tmp5],          %[tmp2]              \n\t"
+    "sra        %[tmp4],        %[tmp4],          %[shift]             \n\t"
+    "sra        %[tmp1],        %[tmp1],          %[shift]             \n\t"
+    "sra        %[tmp6],        %[tmp6],          %[shift]             \n\t"
+    "sra        %[tmp5],        %[tmp5],          %[shift]             \n\t"
+#endif  // #if defined(MIPS_DSP_R2_LE)
+    "sh         %[tmp1],         0(%[ptr_i])                           \n\t"
+    "sh         %[tmp6],         2(%[ptr_i])                           \n\t"
+    "sh         %[tmp4],         0(%[ptr_j])                           \n\t"
+    "blt        %[i],            %[n],            1b                   \n\t"
+    " sh        %[tmp5],         2(%[ptr_j])                           \n\t"
+    "blt        %[m],            %[l],            2b                   \n\t"
+    " addu      %[i],            $zero,           %[m]                 \n\t"
+    "move       %[l],            %[istep]                              \n\t"
+    "blt        %[l],            %[n],            3b                   \n\t"
+    " addiu     %[k],            %[k],            -1                   \n\t"
+
+    ".set pop                                                          \n\t"
+
+    : [tmp1] "=&r" (tmp1), [tmp2] "=&r" (tmp2), [tmp3] "=&r" (tmp3),
+      [tmp4] "=&r" (tmp4), [tmp5] "=&r" (tmp5), [tmp6] "=&r" (tmp6),
+      [ptr_i] "=&r" (ptr_i), [i] "=&r" (i), [m] "=&r" (m), [tmp] "=&r" (tmp),
+      [istep] "=&r" (istep), [wi] "=&r" (wi), [wr] "=&r" (wr), [l] "=&r" (l),
+      [k] "=&r" (k), [round2] "=&r" (round2), [ptr_j] "=&r" (ptr_j),
+      [shift] "=&r" (shift), [scale] "=&r" (scale), [tempMax] "=&r" (tempMax)
+    : [n] "r" (n), [frfi] "r" (frfi), [kSinTable1024] "r" (kSinTable1024)
+    : "hi", "lo", "memory"
+#if defined(MIPS_DSP_R2_LE)
+    , "$ac1hi", "$ac1lo"
+#endif  // #if defined(MIPS_DSP_R2_LE)
+  );
+
+  return scale;
+
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/complex_fft_tables.h b/third_party/libwebrtc/common_audio/signal_processing/complex_fft_tables.h
new file mode 100644
index 0000000000..90fac072d2
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/complex_fft_tables.h
@@ -0,0 +1,132 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
+
+#include <stdint.h>
+
+static const int16_t kSinTable1024[] = {
+    0,      201,    402,    603,    804,    1005,   1206,   1406,   1607,
+    1808,   2009,   2209,   2410,   2610,   2811,   3011,   3211,   3411,
+    3611,   3811,   4011,   4210,   4409,   4608,   4807,   5006,   5205,
+    5403,   5601,   5799,   5997,   6195,   6392,   6589,   6786,   6982,
+    7179,   7375,   7571,   7766,   7961,   8156,   8351,   8545,   8739,
+    8932,   9126,   9319,   9511,   9703,   9895,   10087,  10278,  10469,
+    10659,  10849,  11038,  11227,  11416,  11604,  11792,  11980,  12166,
+    12353,  12539,  12724,  12909,  13094,  13278,  13462,  13645,  13827,
+    14009,  14191,  14372,  14552,  14732,  14911,  15090,  15268,  15446,
+    15623,  15799,  15975,  16150,  16325,  16499,  16672,  16845,  17017,
+    17189,  17360,  17530,  17699,  17868,  18036,  18204,  18371,  18537,
+    18702,  18867,  19031,  19194,  19357,  19519,  19680,  19840,  20000,
+    20159,  20317,  20474,  20631,  20787,  20942,  21096,  21249,  21402,
+    21554,  21705,  21855,  22004,  22153,  22301,  22448,  22594,  22739,
+    22883,  23027,  23169,  23311,  23452,  23592,  23731,  23869,  24006,
+    24143,  24278,  24413,  24546,  24679,  24811,  24942,  25072,  25201,
+    25329,  25456,  25582,  25707,  25831,  25954,  26077,  26198,  26318,
+    26437,  26556,  26673,  26789,  26905,  27019,  27132,  27244,  27355,
+    27466,  27575,  27683,  27790,  27896,  28001,  28105,  28208,  28309,
+    28410,  28510,  28608,  28706,  28802,  28897,  28992,  29085,  29177,
+    29268,  29358,  29446,  29534,  29621,  29706,  29790,  29873,  29955,
+    30036,  30116,  30195,  30272,  30349,  30424,  30498,  30571,  30643,
+    30713,  30783,  30851,  30918,  30984,  31049,  31113,  31175,  31236,
+    31297,  31356,  31413,  31470,  31525,  31580,  31633,  31684,  31735,
+    31785,  31833,  31880,  31926,  31970,  32014,  32056,  32097,  32137,
+    32176,  32213,  32249,  32284,  32318,  32350,  32382,  32412,  32441,
+    32468,  32495,  32520,  32544,  32567,  32588,  32609,  32628,  32646,
+    32662,  32678,  32692,  32705,  32717,  32727,  32736,  32744,  32751,
+    32757,  32761,  32764,  32766,  32767,  32766,  32764,  32761,  32757,
+    32751,  32744,  32736,  32727,  32717,  32705,  32692,  32678,  32662,
+    32646,  32628,  32609,  32588,  32567,  32544,  32520,  32495,  32468,
+    32441,  32412,  32382,  32350,  32318,  32284,  32249,  32213,  32176,
+    32137,  32097,  32056,  32014,  31970,  31926,  31880,  31833,  31785,
+    31735,  31684,  31633,  31580,  31525,  31470,  31413,  31356,  31297,
+    31236,  31175,  31113,  31049,  30984,  30918,  30851,  30783,  30713,
+    30643,  30571,  30498,  30424,  30349,  30272,  30195,  30116,  30036,
+    29955,  29873,  29790,  29706,  29621,  29534,  29446,  29358,  29268,
+    29177,  29085,  28992,  28897,  28802,  28706,  28608,  28510,  28410,
+    28309,  28208,  28105,  28001,  27896,  27790,  27683,  27575,  27466,
+    27355,  27244,  27132,  27019,  26905,  26789,  26673,  26556,  26437,
+    26318,  26198,  26077,  25954,  25831,  25707,  25582,  25456,  25329,
+    25201,  25072,  24942,  24811,  24679,  24546,  24413,  24278,  24143,
+    24006,  23869,  23731,  23592,  23452,  23311,  23169,  23027,  22883,
+    22739,  22594,  22448,  22301,  22153,  22004,  21855,  21705,  21554,
+    21402,  21249,  21096,  20942,  20787,  20631,  20474,  20317,  20159,
+    20000,  19840,  19680,  19519,  19357,  19194,  19031,  18867,  18702,
+    18537,  18371,  18204,  18036,  17868,  17699,  17530,  17360,  17189,
+    17017,  16845,  16672,  16499,  16325,  16150,  15975,  15799,  15623,
+    15446,  15268,  15090,  14911,  14732,  14552,  14372,  14191,  14009,
+    13827,  13645,  13462,  13278,  13094,  12909,  12724,  12539,  12353,
+    12166,  11980,  11792,  11604,  11416,  11227,  11038,  10849,  10659,
+    10469,  10278,  10087,  9895,   9703,   9511,   9319,   9126,   8932,
+    8739,   8545,   8351,   8156,   7961,   7766,   7571,   7375,   7179,
+    6982,   6786,   6589,   6392,   6195,   5997,   5799,   5601,   5403,
+    5205,   5006,   4807,   4608,   4409,   4210,   4011,   3811,   3611,
+    3411,   3211,   3011,   2811,   2610,   2410,   2209,   2009,   1808,
+    1607,   1406,   1206,   1005,   804,    603,    402,    201,    0,
+    -201,   -402,   -603,   -804,   -1005,  -1206,  -1406,  -1607,  -1808,
+    -2009,  -2209,  -2410,  -2610,  -2811,  -3011,  -3211,  -3411,  -3611,
+    -3811,  -4011,  -4210,  -4409,  -4608,  -4807,  -5006,  -5205,  -5403,
+    -5601,  -5799,  -5997,  -6195,  -6392,  -6589,  -6786,  -6982,  -7179,
+    -7375,  -7571,  -7766,  -7961,  -8156,  -8351,  -8545,  -8739,  -8932,
+    -9126,  -9319,  -9511,  -9703,  -9895,  -10087, -10278, -10469, -10659,
+    -10849, -11038, -11227, -11416, -11604, -11792, -11980, -12166, -12353,
+    -12539, -12724, -12909, -13094, -13278, -13462, -13645, -13827, -14009,
+    -14191, -14372, -14552, -14732, -14911, -15090, -15268, -15446, -15623,
+    -15799, -15975, -16150, -16325, -16499, -16672, -16845, -17017, -17189,
+    -17360, -17530, -17699, -17868, -18036, -18204, -18371, -18537, -18702,
+    -18867, -19031, -19194, -19357, -19519, -19680, -19840, -20000, -20159,
+    -20317, -20474, -20631, -20787, -20942, -21096, -21249, -21402, -21554,
+    -21705, -21855, -22004, -22153, -22301, -22448, -22594, -22739, -22883,
+    -23027, -23169, -23311, -23452, -23592, -23731, -23869, -24006, -24143,
+    -24278, -24413, -24546, -24679, -24811, -24942, -25072, -25201, -25329,
+    -25456, -25582, -25707, -25831, -25954, -26077, -26198, -26318, -26437,
+    -26556, -26673, -26789, -26905, -27019, -27132, -27244, -27355, -27466,
+    -27575, -27683, -27790, -27896, -28001, -28105, -28208, -28309, -28410,
+    -28510, -28608, -28706, -28802, -28897, -28992, -29085, -29177, -29268,
+    -29358, -29446, -29534, -29621, -29706, -29790, -29873, -29955, -30036,
+    -30116, -30195, -30272, -30349, -30424, -30498, -30571, -30643, -30713,
+    -30783, -30851, -30918, -30984, -31049, -31113, -31175, -31236, -31297,
+    -31356, -31413, -31470, -31525, -31580, -31633, -31684, -31735, -31785,
+    -31833, -31880, -31926, -31970, -32014, -32056, -32097, -32137, -32176,
+    -32213, -32249, -32284, -32318, -32350, -32382, -32412, -32441, -32468,
+    -32495, -32520, -32544, -32567, -32588, -32609, -32628, -32646, -32662,
+    -32678, -32692, -32705, -32717, -32727, -32736, -32744, -32751, -32757,
+    -32761, -32764, -32766, -32767, -32766, -32764, -32761, -32757, -32751,
+    -32744, -32736, -32727, -32717, -32705, -32692, -32678, -32662, -32646,
+    -32628, -32609, -32588, -32567, -32544, -32520, -32495, -32468, -32441,
+    -32412, -32382, -32350, -32318, -32284, -32249, -32213, -32176, -32137,
+    -32097, -32056, -32014, -31970, -31926, -31880, -31833, -31785, -31735,
+    -31684, -31633, -31580, -31525, -31470, -31413, -31356, -31297, -31236,
+    -31175, -31113, -31049, -30984, -30918, -30851, -30783, -30713, -30643,
+    -30571, -30498, -30424, -30349, -30272, -30195, -30116, -30036, -29955,
+    -29873, -29790, -29706, -29621, -29534, -29446, -29358, -29268, -29177,
+    -29085, -28992, -28897, -28802, -28706, -28608, -28510, -28410, -28309,
+    -28208, -28105, -28001, -27896, -27790, -27683, -27575, -27466, -27355,
+    -27244, -27132, -27019, -26905, -26789, -26673, -26556, -26437, -26318,
+    -26198, -26077, -25954, -25831, -25707, -25582, -25456, -25329, -25201,
+    -25072, -24942, -24811, -24679, -24546, -24413, -24278, -24143, -24006,
+    -23869, -23731, -23592, -23452, -23311, -23169, -23027, -22883, -22739,
+    -22594, -22448, -22301, -22153, -22004, -21855, -21705, -21554, -21402,
+    -21249, -21096, -20942, -20787, -20631, -20474, -20317, -20159, -20000,
+    -19840, -19680, -19519, -19357, -19194, -19031, -18867, -18702, -18537,
+    -18371, -18204, -18036, -17868, -17699, -17530, -17360, -17189, -17017,
+    -16845, -16672, -16499, -16325, -16150, -15975, -15799, -15623, -15446,
+    -15268, -15090, -14911, -14732, -14552, -14372, -14191, -14009, -13827,
+    -13645, -13462, -13278, -13094, -12909, -12724, -12539, -12353, -12166,
+    -11980, -11792, -11604, -11416, -11227, -11038, -10849, -10659, -10469,
+    -10278, -10087, -9895,  -9703,  -9511,  -9319,  -9126,  -8932,  -8739,
+    -8545,  -8351,  -8156,  -7961,  -7766,  -7571,  -7375,  -7179,  -6982,
+    -6786,  -6589,  -6392,  -6195,  -5997,  -5799,  -5601,  -5403,  -5205,
+    -5006,  -4807,  -4608,  -4409,  -4210,  -4011,  -3811,  -3611,  -3411,
+    -3211,  -3011,  -2811,  -2610,  -2410,  -2209,  -2009,  -1808,  -1607,
+    -1406,  -1206,  -1005,  -804,   -603,   -402,   -201};
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
diff --git a/third_party/libwebrtc/common_audio/signal_processing/copy_set_operations.c b/third_party/libwebrtc/common_audio/signal_processing/copy_set_operations.c
new file mode 100644
index 0000000000..ae709d40f0
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/copy_set_operations.c
@@ -0,0 +1,82 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the implementation of functions
+ * WebRtcSpl_MemSetW16()
+ * WebRtcSpl_MemSetW32()
+ * WebRtcSpl_MemCpyReversedOrder()
+ * WebRtcSpl_CopyFromEndW16()
+ * WebRtcSpl_ZerosArrayW16()
+ * WebRtcSpl_ZerosArrayW32()
+ *
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include <string.h>
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+
+void WebRtcSpl_MemSetW16(int16_t *ptr, int16_t set_value, size_t length)
+{
+    size_t j;
+    int16_t *arrptr = ptr;
+
+    for (j = length; j > 0; j--)
+    {
+        *arrptr++ = set_value;
+    }
+}
+
+void WebRtcSpl_MemSetW32(int32_t *ptr, int32_t set_value, size_t length)
+{
+    size_t j;
+    int32_t *arrptr = ptr;
+
+    for (j = length; j > 0; j--)
+    {
+        *arrptr++ = set_value;
+    }
+}
+
+void WebRtcSpl_MemCpyReversedOrder(int16_t* dest,
+                                   int16_t* source,
+                                   size_t length)
+{
+    size_t j;
+    int16_t* destPtr = dest;
+    int16_t* sourcePtr = source;
+
+    for (j = 0; j < length; j++)
+    {
+        *destPtr-- = *sourcePtr++;
+    }
+}
+
+void WebRtcSpl_CopyFromEndW16(const int16_t *vector_in,
+                              size_t length,
+                              size_t samples,
+                              int16_t *vector_out)
+{
+    // Copy the last <samples> of the input vector to vector_out
+    WEBRTC_SPL_MEMCPY_W16(vector_out, &vector_in[length - samples], samples);
+}
+
+void WebRtcSpl_ZerosArrayW16(int16_t *vector, size_t length)
+{
+    WebRtcSpl_MemSetW16(vector, 0, length);
+}
+
+void WebRtcSpl_ZerosArrayW32(int32_t *vector, size_t length)
+{
+    WebRtcSpl_MemSetW32(vector, 0, length);
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/cross_correlation.c b/third_party/libwebrtc/common_audio/signal_processing/cross_correlation.c
new file mode 100644
index 0000000000..c6267c92c2
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/cross_correlation.c
@@ -0,0 +1,30 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+/* C version of WebRtcSpl_CrossCorrelation() for generic platforms. */
+void WebRtcSpl_CrossCorrelationC(int32_t* cross_correlation,
+                                 const int16_t* seq1,
+                                 const int16_t* seq2,
+                                 size_t dim_seq,
+                                 size_t dim_cross_correlation,
+                                 int right_shifts,
+                                 int step_seq2) {
+  size_t i = 0, j = 0;
+
+  for (i = 0; i < dim_cross_correlation; i++) {
+    int32_t corr = 0;
+    for (j = 0; j < dim_seq; j++)
+      corr += (seq1[j] * seq2[j]) >> right_shifts;
+    seq2 += step_seq2;
+    *cross_correlation++ = corr;
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_mips.c b/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_mips.c
new file mode 100644
index 0000000000..c395101900
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_mips.c
@@ -0,0 +1,104 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_CrossCorrelation_mips(int32_t* cross_correlation,
+                                     const int16_t* seq1,
+                                     const int16_t* seq2,
+                                     size_t dim_seq,
+                                     size_t dim_cross_correlation,
+                                     int right_shifts,
+                                     int step_seq2) {
+
+  int32_t t0 = 0, t1 = 0, t2 = 0, t3 = 0, sum = 0;
+  int16_t *pseq2 = NULL;
+  int16_t *pseq1 = NULL;
+  int16_t *pseq1_0 = (int16_t*)&seq1[0];
+  int16_t *pseq2_0 = (int16_t*)&seq2[0];
+  int k = 0;
+
+  __asm __volatile (
+    ".set        push                                           \n\t"
+    ".set        noreorder                                      \n\t"
+    "sll         %[step_seq2], %[step_seq2],   1                \n\t"
+    "andi        %[t0],        %[dim_seq],     1                \n\t"
+    "bgtz        %[t0],        3f                               \n\t"
+    " nop                                                       \n\t"
+   "1:                                                          \n\t"
+    "move        %[pseq1],     %[pseq1_0]                       \n\t"
+    "move        %[pseq2],     %[pseq2_0]                       \n\t"
+    "sra         %[k],         %[dim_seq],     1                \n\t"
+    "addiu       %[dim_cc],    %[dim_cc],      -1               \n\t"
+    "xor         %[sum],       %[sum],         %[sum]           \n\t"
+   "2:                                                          \n\t"
+    "lh          %[t0],        0(%[pseq1])                      \n\t"
+    "lh          %[t1],        0(%[pseq2])                      \n\t"
+    "lh          %[t2],        2(%[pseq1])                      \n\t"
+    "lh          %[t3],        2(%[pseq2])                      \n\t"
+    "mul         %[t0],        %[t0],          %[t1]            \n\t"
+    "addiu       %[k],         %[k],           -1               \n\t"
+    "mul         %[t2],        %[t2],          %[t3]            \n\t"
+    "addiu       %[pseq1],     %[pseq1],       4                \n\t"
+    "addiu       %[pseq2],     %[pseq2],       4                \n\t"
+    "srav        %[t0],        %[t0],          %[right_shifts]  \n\t"
+    "addu        %[sum],       %[sum],         %[t0]            \n\t"
+    "srav        %[t2],        %[t2],          %[right_shifts]  \n\t"
+    "bgtz        %[k],         2b                               \n\t"
+    " addu       %[sum],       %[sum],         %[t2]            \n\t"
+    "addu        %[pseq2_0],   %[pseq2_0],     %[step_seq2]     \n\t"
+    "sw          %[sum],       0(%[cc])                         \n\t"
+    "bgtz        %[dim_cc],    1b                               \n\t"
+    " addiu      %[cc],        %[cc],          4                \n\t"
+    "b           6f                                             \n\t"
+    " nop                                                       \n\t"
+   "3:                                                          \n\t"
+    "move        %[pseq1],     %[pseq1_0]                       \n\t"
+    "move        %[pseq2],     %[pseq2_0]                       \n\t"
+    "sra         %[k],         %[dim_seq],     1                \n\t"
+    "addiu       %[dim_cc],    %[dim_cc],      -1               \n\t"
+    "beqz        %[k],         5f                               \n\t"
+    " xor        %[sum],       %[sum],         %[sum]           \n\t"
+   "4:                                                          \n\t"
+    "lh          %[t0],        0(%[pseq1])                      \n\t"
+    "lh          %[t1],        0(%[pseq2])                      \n\t"
+    "lh          %[t2],        2(%[pseq1])                      \n\t"
+    "lh          %[t3],        2(%[pseq2])                      \n\t"
+    "mul         %[t0],        %[t0],          %[t1]            \n\t"
+    "addiu       %[k],         %[k],           -1               \n\t"
+    "mul         %[t2],        %[t2],          %[t3]            \n\t"
+    "addiu       %[pseq1],     %[pseq1],       4                \n\t"
+    "addiu       %[pseq2],     %[pseq2],       4                \n\t"
+    "srav        %[t0],        %[t0],          %[right_shifts]  \n\t"
+    "addu        %[sum],       %[sum],         %[t0]            \n\t"
+    "srav        %[t2],        %[t2],          %[right_shifts]  \n\t"
+    "bgtz        %[k],         4b                               \n\t"
+    " addu       %[sum],       %[sum],         %[t2]            \n\t"
+   "5:                                                          \n\t"
+    "lh          %[t0],        0(%[pseq1])                      \n\t"
+    "lh          %[t1],        0(%[pseq2])                      \n\t"
+    "mul         %[t0],        %[t0],          %[t1]            \n\t"
+    "srav        %[t0],        %[t0],          %[right_shifts]  \n\t"
+    "addu        %[sum],       %[sum],         %[t0]            \n\t"
+    "addu        %[pseq2_0],   %[pseq2_0],     %[step_seq2]     \n\t"
+    "sw          %[sum],       0(%[cc])                         \n\t"
+    "bgtz        %[dim_cc],    3b                               \n\t"
+    " addiu      %[cc],        %[cc],          4                \n\t"
+   "6:                                                          \n\t"
+    ".set        pop                                            \n\t"
+    : [step_seq2] "+r" (step_seq2), [t0] "=&r" (t0), [t1] "=&r" (t1),
+      [t2] "=&r" (t2), [t3] "=&r" (t3), [pseq1] "=&r" (pseq1),
+      [pseq2] "=&r" (pseq2), [pseq1_0] "+r" (pseq1_0), [pseq2_0] "+r" (pseq2_0),
+      [k] "=&r" (k), [dim_cc] "+r" (dim_cross_correlation), [sum] "=&r" (sum),
+      [cc] "+r" (cross_correlation)
+    : [dim_seq] "r" (dim_seq), [right_shifts] "r" (right_shifts)
+    : "hi", "lo", "memory"
+  );
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_neon.c b/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_neon.c
new file mode 100644
index 0000000000..d3ecf138e3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/cross_correlation_neon.c
@@ -0,0 +1,88 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/system/arch.h"
+
+#include <arm_neon.h>
+
+static inline void DotProductWithScaleNeon(int32_t* cross_correlation,
+                                           const int16_t* vector1,
+                                           const int16_t* vector2,
+                                           size_t length,
+                                           int scaling) {
+  size_t i = 0;
+  size_t len1 = length >> 3;
+  size_t len2 = length & 7;
+  int64x2_t sum0 = vdupq_n_s64(0);
+  int64x2_t sum1 = vdupq_n_s64(0);
+
+  for (i = len1; i > 0; i -= 1) {
+    int16x8_t seq1_16x8 = vld1q_s16(vector1);
+    int16x8_t seq2_16x8 = vld1q_s16(vector2);
+#if defined(WEBRTC_ARCH_ARM64)
+    int32x4_t tmp0 = vmull_s16(vget_low_s16(seq1_16x8),
+                               vget_low_s16(seq2_16x8));
+    int32x4_t tmp1 = vmull_high_s16(seq1_16x8, seq2_16x8);
+#else
+    int32x4_t tmp0 = vmull_s16(vget_low_s16(seq1_16x8),
+                               vget_low_s16(seq2_16x8));
+    int32x4_t tmp1 = vmull_s16(vget_high_s16(seq1_16x8),
+                               vget_high_s16(seq2_16x8));
+#endif
+    sum0 = vpadalq_s32(sum0, tmp0);
+    sum1 = vpadalq_s32(sum1, tmp1);
+    vector1 += 8;
+    vector2 += 8;
+  }
+
+  // Calculate the rest of the samples.
+  int64_t sum_res = 0;
+  for (i = len2; i > 0; i -= 1) {
+    sum_res += WEBRTC_SPL_MUL_16_16(*vector1, *vector2);
+    vector1++;
+    vector2++;
+  }
+
+  sum0 = vaddq_s64(sum0, sum1);
+#if defined(WEBRTC_ARCH_ARM64)
+  int64_t sum2 = vaddvq_s64(sum0);
+  *cross_correlation = (int32_t)((sum2 + sum_res) >> scaling);
+#else
+  int64x1_t shift = vdup_n_s64(-scaling);
+  int64x1_t sum2 = vadd_s64(vget_low_s64(sum0), vget_high_s64(sum0));
+  sum2 = vadd_s64(sum2, vdup_n_s64(sum_res));
+  sum2 = vshl_s64(sum2, shift);
+  vst1_lane_s32(cross_correlation, vreinterpret_s32_s64(sum2), 0);
+#endif
+}
+
+/* NEON version of WebRtcSpl_CrossCorrelation() for ARM32/64 platforms. */
+void WebRtcSpl_CrossCorrelationNeon(int32_t* cross_correlation,
+                                    const int16_t* seq1,
+                                    const int16_t* seq2,
+                                    size_t dim_seq,
+                                    size_t dim_cross_correlation,
+                                    int right_shifts,
+                                    int step_seq2) {
+  int i = 0;
+
+  for (i = 0; i < (int)dim_cross_correlation; i++) {
+    const int16_t* seq1_ptr = seq1;
+    const int16_t* seq2_ptr = seq2 + (step_seq2 * i);
+
+    DotProductWithScaleNeon(cross_correlation,
+                            seq1_ptr,
+                            seq2_ptr,
+                            dim_seq,
+                            right_shifts);
+    cross_correlation++;
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/division_operations.c b/third_party/libwebrtc/common_audio/signal_processing/division_operations.c
new file mode 100644
index 0000000000..4764ddfccd
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/division_operations.c
@@ -0,0 +1,140 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains implementations of the divisions
+ * WebRtcSpl_DivU32U16()
+ * WebRtcSpl_DivW32W16()
+ * WebRtcSpl_DivW32W16ResW16()
+ * WebRtcSpl_DivResultInQ31()
+ * WebRtcSpl_DivW32HiLow()
+ *
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/sanitizer.h"
+
+uint32_t WebRtcSpl_DivU32U16(uint32_t num, uint16_t den)
+{
+    // Guard against division with 0
+    if (den != 0)
+    {
+        return (uint32_t)(num / den);
+    } else
+    {
+        return (uint32_t)0xFFFFFFFF;
+    }
+}
+
+int32_t WebRtcSpl_DivW32W16(int32_t num, int16_t den)
+{
+    // Guard against division with 0
+    if (den != 0)
+    {
+        return (int32_t)(num / den);
+    } else
+    {
+        return (int32_t)0x7FFFFFFF;
+    }
+}
+
+int16_t WebRtcSpl_DivW32W16ResW16(int32_t num, int16_t den)
+{
+    // Guard against division with 0
+    if (den != 0)
+    {
+        return (int16_t)(num / den);
+    } else
+    {
+        return (int16_t)0x7FFF;
+    }
+}
+
+int32_t WebRtcSpl_DivResultInQ31(int32_t num, int32_t den)
+{
+    int32_t L_num = num;
+    int32_t L_den = den;
+    int32_t div = 0;
+    int k = 31;
+    int change_sign = 0;
+
+    if (num == 0)
+        return 0;
+
+    if (num < 0)
+    {
+        change_sign++;
+        L_num = -num;
+    }
+    if (den < 0)
+    {
+        change_sign++;
+        L_den = -den;
+    }
+    while (k--)
+    {
+        div <<= 1;
+        L_num <<= 1;
+        if (L_num >= L_den)
+        {
+            L_num -= L_den;
+            div++;
+        }
+    }
+    if (change_sign == 1)
+    {
+        div = -div;
+    }
+    return div;
+}
+
+int32_t WebRtcSpl_DivW32HiLow(int32_t num, int16_t den_hi, int16_t den_low)
+{
+    int16_t approx, tmp_hi, tmp_low, num_hi, num_low;
+    int32_t tmpW32;
+
+    approx = (int16_t)WebRtcSpl_DivW32W16((int32_t)0x1FFFFFFF, den_hi);
+    // result in Q14 (Note: 3FFFFFFF = 0.5 in Q30)
+
+    // tmpW32 = 1/den = approx * (2.0 - den * approx) (in Q30)
+    tmpW32 = (den_hi * approx << 1) + ((den_low * approx >> 15) << 1);
+    // tmpW32 = den * approx
+
+    // result in Q30 (tmpW32 = 2.0-(den*approx))
+    tmpW32 = (int32_t)((int64_t)0x7fffffffL - tmpW32);
+
+    // Store tmpW32 in hi and low format
+    tmp_hi = (int16_t)(tmpW32 >> 16);
+    tmp_low = (int16_t)((tmpW32 - ((int32_t)tmp_hi << 16)) >> 1);
+
+    // tmpW32 = 1/den in Q29
+    tmpW32 = (tmp_hi * approx + (tmp_low * approx >> 15)) << 1;
+
+    // 1/den in hi and low format
+    tmp_hi = (int16_t)(tmpW32 >> 16);
+    tmp_low = (int16_t)((tmpW32 - ((int32_t)tmp_hi << 16)) >> 1);
+
+    // Store num in hi and low format
+    num_hi = (int16_t)(num >> 16);
+    num_low = (int16_t)((num - ((int32_t)num_hi << 16)) >> 1);
+
+    // num * (1/den) by 32 bit multiplication (result in Q28)
+
+    tmpW32 = num_hi * tmp_hi + (num_hi * tmp_low >> 15) +
+        (num_low * tmp_hi >> 15);
+
+    // Put result in Q31 (convert from Q28)
+    tmpW32 = WEBRTC_SPL_LSHIFT_W32(tmpW32, 3);
+
+    return tmpW32;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc b/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc
new file mode 100644
index 0000000000..00799dae02
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.cc
@@ -0,0 +1,34 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/dot_product_with_scale.h"
+
+#include "rtc_base/numerics/safe_conversions.h"
+
+int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1,
+                                      const int16_t* vector2,
+                                      size_t length,
+                                      int scaling) {
+  int64_t sum = 0;
+  size_t i = 0;
+
+  /* Unroll the loop to improve performance. */
+  for (i = 0; i + 3 < length; i += 4) {
+    sum += (vector1[i + 0] * vector2[i + 0]) >> scaling;
+    sum += (vector1[i + 1] * vector2[i + 1]) >> scaling;
+    sum += (vector1[i + 2] * vector2[i + 2]) >> scaling;
+    sum += (vector1[i + 3] * vector2[i + 3]) >> scaling;
+  }
+  for (; i < length; i++) {
+    sum += (vector1[i] * vector2[i]) >> scaling;
+  }
+
+  return rtc::saturated_cast<int32_t>(sum);
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.h b/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.h
new file mode 100644
index 0000000000..9f0d922aaf
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/dot_product_with_scale.h
@@ -0,0 +1,40 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_DOT_PRODUCT_WITH_SCALE_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_DOT_PRODUCT_WITH_SCALE_H_
+
+#include <stdint.h>
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Calculates the dot product between two (int16_t) vectors.
+//
+// Input:
+//      - vector1       : Vector 1
+//      - vector2       : Vector 2
+//      - vector_length : Number of samples used in the dot product
+//      - scaling       : The number of right bit shifts to apply on each term
+//                        during calculation to avoid overflow, i.e., the
+//                        output will be in Q(-`scaling`)
+//
+// Return value         : The dot product in Q(-scaling)
+int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1,
+                                      const int16_t* vector2,
+                                      size_t length,
+                                      int scaling);
+
+#ifdef __cplusplus
+}
+#endif  // __cplusplus
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_DOT_PRODUCT_WITH_SCALE_H_
diff --git a/third_party/libwebrtc/common_audio/signal_processing/downsample_fast.c b/third_party/libwebrtc/common_audio/signal_processing/downsample_fast.c
new file mode 100644
index 0000000000..80fdc58a49
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/downsample_fast.c
@@ -0,0 +1,65 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#include "rtc_base/checks.h"
+#include "rtc_base/sanitizer.h"
+
+// TODO(Bjornv): Change the function parameter order to WebRTC code style.
+// C version of WebRtcSpl_DownsampleFast() for generic platforms.
+int WebRtcSpl_DownsampleFastC(const int16_t* data_in,
+                              size_t data_in_length,
+                              int16_t* data_out,
+                              size_t data_out_length,
+                              const int16_t* __restrict coefficients,
+                              size_t coefficients_length,
+                              int factor,
+                              size_t delay) {
+  int16_t* const original_data_out = data_out;
+  size_t i = 0;
+  size_t j = 0;
+  int32_t out_s32 = 0;
+  size_t endpos = delay + factor * (data_out_length - 1) + 1;
+
+  // Return error if any of the running conditions doesn't meet.
+  if (data_out_length == 0 || coefficients_length == 0
+                           || data_in_length < endpos) {
+    return -1;
+  }
+
+  rtc_MsanCheckInitialized(coefficients, sizeof(coefficients[0]),
+                           coefficients_length);
+
+  for (i = delay; i < endpos; i += factor) {
+    out_s32 = 2048;  // Round value, 0.5 in Q12.
+
+    for (j = 0; j < coefficients_length; j++) {
+      // Negative overflow is permitted here, because this is
+      // auto-regressive filters, and the state for each batch run is
+      // stored in the "negative" positions of the output vector.
+      rtc_MsanCheckInitialized(&data_in[(ptrdiff_t) i - (ptrdiff_t) j],
+          sizeof(data_in[0]), 1);
+      // out_s32 is in Q12 domain.
+      out_s32 += coefficients[j] * data_in[(ptrdiff_t) i - (ptrdiff_t) j];
+    }
+
+    out_s32 >>= 12;  // Q0.
+
+    // Saturate and store the output.
+    *data_out++ = WebRtcSpl_SatW32ToW16(out_s32);
+  }
+
+  RTC_DCHECK_EQ(original_data_out + data_out_length, data_out);
+  rtc_MsanCheckInitialized(original_data_out, sizeof(original_data_out[0]),
+                           data_out_length);
+
+  return 0;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_mips.c b/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_mips.c
new file mode 100644
index 0000000000..0f3f3a069f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_mips.c
@@ -0,0 +1,169 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// Version of WebRtcSpl_DownsampleFast() for MIPS platforms.
+int WebRtcSpl_DownsampleFast_mips(const int16_t* data_in,
+                                  size_t data_in_length,
+                                  int16_t* data_out,
+                                  size_t data_out_length,
+                                  const int16_t* __restrict coefficients,
+                                  size_t coefficients_length,
+                                  int factor,
+                                  size_t delay) {
+  int i;
+  int j;
+  int k;
+  int32_t out_s32 = 0;
+  size_t endpos = delay + factor * (data_out_length - 1) + 1;
+
+  int32_t  tmp1, tmp2, tmp3, tmp4, factor_2;
+  int16_t* p_coefficients;
+  int16_t* p_data_in;
+  int16_t* p_data_in_0 = (int16_t*)&data_in[delay];
+  int16_t* p_coefficients_0 = (int16_t*)&coefficients[0];
+#if !defined(MIPS_DSP_R1_LE)
+  int32_t max_16 = 0x7FFF;
+  int32_t min_16 = 0xFFFF8000;
+#endif  // #if !defined(MIPS_DSP_R1_LE)
+
+  // Return error if any of the running conditions doesn't meet.
+  if (data_out_length == 0 || coefficients_length == 0
+                           || data_in_length < endpos) {
+    return -1;
+  }
+#if defined(MIPS_DSP_R2_LE)
+  __asm __volatile (
+    ".set        push                                                \n\t"
+    ".set        noreorder                                           \n\t"
+    "subu        %[i],            %[endpos],       %[delay]          \n\t"
+    "sll         %[factor_2],     %[factor],       1                 \n\t"
+   "1:                                                               \n\t"
+    "move        %[p_data_in],    %[p_data_in_0]                     \n\t"
+    "mult        $zero,           $zero                              \n\t"
+    "move        %[p_coefs],      %[p_coefs_0]                       \n\t"
+    "sra         %[j],            %[coef_length],  2                 \n\t"
+    "beq         %[j],            $zero,           3f                \n\t"
+    " andi       %[k],            %[coef_length],  3                 \n\t"
+   "2:                                                               \n\t"
+    "lwl         %[tmp1],         1(%[p_data_in])                    \n\t"
+    "lwl         %[tmp2],         3(%[p_coefs])                      \n\t"
+    "lwl         %[tmp3],         -3(%[p_data_in])                   \n\t"
+    "lwl         %[tmp4],         7(%[p_coefs])                      \n\t"
+    "lwr         %[tmp1],         -2(%[p_data_in])                   \n\t"
+    "lwr         %[tmp2],         0(%[p_coefs])                      \n\t"
+    "lwr         %[tmp3],         -6(%[p_data_in])                   \n\t"
+    "lwr         %[tmp4],         4(%[p_coefs])                      \n\t"
+    "packrl.ph   %[tmp1],         %[tmp1],         %[tmp1]           \n\t"
+    "packrl.ph   %[tmp3],         %[tmp3],         %[tmp3]           \n\t"
+    "dpa.w.ph    $ac0,            %[tmp1],         %[tmp2]           \n\t"
+    "dpa.w.ph    $ac0,            %[tmp3],         %[tmp4]           \n\t"
+    "addiu       %[j],            %[j],            -1                \n\t"
+    "addiu       %[p_data_in],    %[p_data_in],    -8                \n\t"
+    "bgtz        %[j],            2b                                 \n\t"
+    " addiu      %[p_coefs],      %[p_coefs],      8                 \n\t"
+   "3:                                                               \n\t"
+    "beq         %[k],            $zero,           5f                \n\t"
+    " nop                                                            \n\t"
+   "4:                                                               \n\t"
+    "lhu         %[tmp1],         0(%[p_data_in])                    \n\t"
+    "lhu         %[tmp2],         0(%[p_coefs])                      \n\t"
+    "addiu       %[p_data_in],    %[p_data_in],    -2                \n\t"
+    "addiu       %[k],            %[k],            -1                \n\t"
+    "dpa.w.ph    $ac0,            %[tmp1],         %[tmp2]           \n\t"
+    "bgtz        %[k],            4b                                 \n\t"
+    " addiu      %[p_coefs],      %[p_coefs],      2                 \n\t"
+   "5:                                                               \n\t"
+    "extr_r.w    %[out_s32],      $ac0,            12                \n\t"
+    "addu        %[p_data_in_0],  %[p_data_in_0],  %[factor_2]       \n\t"
+    "subu        %[i],            %[i],            %[factor]         \n\t"
+    "shll_s.w    %[out_s32],      %[out_s32],      16                \n\t"
+    "sra         %[out_s32],      %[out_s32],      16                \n\t"
+    "sh          %[out_s32],      0(%[data_out])                     \n\t"
+    "bgtz        %[i],            1b                                 \n\t"
+    " addiu      %[data_out],     %[data_out],     2                 \n\t"
+    ".set        pop                                                 \n\t"
+    : [tmp1] "=&r" (tmp1), [tmp2] "=&r" (tmp2), [tmp3] "=&r" (tmp3),
+      [tmp4] "=&r" (tmp4), [p_data_in] "=&r" (p_data_in),
+      [p_data_in_0] "+r" (p_data_in_0), [p_coefs] "=&r" (p_coefficients),
+      [j] "=&r" (j), [out_s32] "=&r" (out_s32), [factor_2] "=&r" (factor_2),
+      [i] "=&r" (i), [k] "=&r" (k)
+    : [coef_length] "r" (coefficients_length), [data_out] "r" (data_out),
+      [p_coefs_0] "r" (p_coefficients_0), [endpos] "r" (endpos),
+      [delay] "r" (delay), [factor] "r" (factor)
+    : "memory", "hi", "lo"
+ );
+#else  // #if defined(MIPS_DSP_R2_LE)
+  __asm __volatile (
+    ".set        push                                                \n\t"
+    ".set        noreorder                                           \n\t"
+    "sll         %[factor_2],     %[factor],       1                 \n\t"
+    "subu        %[i],            %[endpos],       %[delay]          \n\t"
+   "1:                                                               \n\t"
+    "move        %[p_data_in],    %[p_data_in_0]                     \n\t"
+    "addiu       %[out_s32],      $zero,           2048              \n\t"
+    "move        %[p_coefs],      %[p_coefs_0]                       \n\t"
+    "sra         %[j],            %[coef_length],  1                 \n\t"
+    "beq         %[j],            $zero,           3f                \n\t"
+    " andi       %[k],            %[coef_length],  1                 \n\t"
+   "2:                                                               \n\t"
+    "lh          %[tmp1],         0(%[p_data_in])                    \n\t"
+    "lh          %[tmp2],         0(%[p_coefs])                      \n\t"
+    "lh          %[tmp3],         -2(%[p_data_in])                   \n\t"
+    "lh          %[tmp4],         2(%[p_coefs])                      \n\t"
+    "mul         %[tmp1],         %[tmp1],         %[tmp2]           \n\t"
+    "addiu       %[p_coefs],      %[p_coefs],      4                 \n\t"
+    "mul         %[tmp3],         %[tmp3],         %[tmp4]           \n\t"
+    "addiu       %[j],            %[j],            -1                \n\t"
+    "addiu       %[p_data_in],    %[p_data_in],    -4                \n\t"
+    "addu        %[tmp1],         %[tmp1],         %[tmp3]           \n\t"
+    "bgtz        %[j],            2b                                 \n\t"
+    " addu       %[out_s32],      %[out_s32],      %[tmp1]           \n\t"
+   "3:                                                               \n\t"
+    "beq         %[k],            $zero,           4f                \n\t"
+    " nop                                                            \n\t"
+    "lh          %[tmp1],         0(%[p_data_in])                    \n\t"
+    "lh          %[tmp2],         0(%[p_coefs])                      \n\t"
+    "mul         %[tmp1],         %[tmp1],         %[tmp2]           \n\t"
+    "addu        %[out_s32],      %[out_s32],      %[tmp1]           \n\t"
+   "4:                                                               \n\t"
+    "sra         %[out_s32],      %[out_s32],      12                \n\t"
+    "addu        %[p_data_in_0],  %[p_data_in_0],  %[factor_2]       \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "shll_s.w    %[out_s32],      %[out_s32],      16                \n\t"
+    "sra         %[out_s32],      %[out_s32],      16                \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "slt         %[tmp1],         %[max_16],       %[out_s32]        \n\t"
+    "movn        %[out_s32],      %[max_16],       %[tmp1]           \n\t"
+    "slt         %[tmp1],         %[out_s32],      %[min_16]         \n\t"
+    "movn        %[out_s32],      %[min_16],       %[tmp1]           \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+    "subu        %[i],            %[i],            %[factor]         \n\t"
+    "sh          %[out_s32],      0(%[data_out])                     \n\t"
+    "bgtz        %[i],            1b                                 \n\t"
+    " addiu      %[data_out],     %[data_out],     2                 \n\t"
+    ".set        pop                                                 \n\t"
+    : [tmp1] "=&r" (tmp1), [tmp2] "=&r" (tmp2), [tmp3] "=&r" (tmp3),
+      [tmp4] "=&r" (tmp4), [p_data_in] "=&r" (p_data_in), [k] "=&r" (k),
+      [p_data_in_0] "+r" (p_data_in_0), [p_coefs] "=&r" (p_coefficients),
+      [j] "=&r" (j), [out_s32] "=&r" (out_s32), [factor_2] "=&r" (factor_2),
+      [i] "=&r" (i)
+    : [coef_length] "r" (coefficients_length), [data_out] "r" (data_out),
+      [p_coefs_0] "r" (p_coefficients_0), [endpos] "r" (endpos),
+#if !defined(MIPS_DSP_R1_LE)
+      [max_16] "r" (max_16), [min_16] "r" (min_16),
+#endif  // #if !defined(MIPS_DSP_R1_LE)
+      [delay] "r" (delay), [factor] "r" (factor)
+    : "memory", "hi", "lo"
+  );
+#endif  // #if defined(MIPS_DSP_R2_LE)
+  return 0;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_neon.c b/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_neon.c
new file mode 100644
index 0000000000..f1b754b798
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/downsample_fast_neon.c
@@ -0,0 +1,224 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <arm_neon.h>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#include "rtc_base/checks.h"
+
+// NEON intrinsics version of WebRtcSpl_DownsampleFast()
+// for ARM 32-bit/64-bit platforms.
+int WebRtcSpl_DownsampleFastNeon(const int16_t* data_in,
+                                 size_t data_in_length,
+                                 int16_t* data_out,
+                                 size_t data_out_length,
+                                 const int16_t* __restrict coefficients,
+                                 size_t coefficients_length,
+                                 int factor,
+                                 size_t delay) {
+  // Using signed indexes to be able to compute negative i-j that
+  // is used to index data_in.
+  int i = 0;
+  int j = 0;
+  int32_t out_s32 = 0;
+  int endpos = delay + factor * (data_out_length - 1) + 1;
+  size_t res = data_out_length & 0x7;
+  int endpos1 = endpos - factor * res;
+
+  // Return error if any of the running conditions doesn't meet.
+  if (data_out_length == 0 || coefficients_length == 0
+                           || (int)data_in_length < endpos) {
+    return -1;
+  }
+
+  RTC_DCHECK_GE(endpos, 0);
+  RTC_DCHECK_GE(endpos1, 0);
+
+  // First part, unroll the loop 8 times, with 3 subcases
+  // (factor == 2, 4, others).
+  switch (factor) {
+    case 2: {
+      for (i = delay; i < endpos1; i += 16) {
+        // Round value, 0.5 in Q12.
+        int32x4_t out32x4_0 = vdupq_n_s32(2048);
+        int32x4_t out32x4_1 = vdupq_n_s32(2048);
+
+#if defined(WEBRTC_ARCH_ARM64)
+        // Unroll the loop 2 times.
+        for (j = 0; j < (int)coefficients_length - 1; j += 2) {
+          int32x2_t coeff32 = vld1_dup_s32((int32_t*)&coefficients[j]);
+          int16x4_t coeff16x4 = vreinterpret_s16_s32(coeff32);
+          int16x8x2_t in16x8x2 = vld2q_s16(&data_in[i - j - 1]);
+
+          // Mul and accumulate low 64-bit data.
+          int16x4_t in16x4_0 = vget_low_s16(in16x8x2.val[0]);
+          int16x4_t in16x4_1 = vget_low_s16(in16x8x2.val[1]);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_0, coeff16x4, 1);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_1, coeff16x4, 0);
+
+          // Mul and accumulate high 64-bit data.
+          // TODO: vget_high_s16 need extra cost on ARM64. This could be
+          // replaced by vmlal_high_lane_s16. But for the interface of
+          // vmlal_high_lane_s16, there is a bug in gcc 4.9.
+          // This issue need to be tracked in the future.
+          int16x4_t in16x4_2 = vget_high_s16(in16x8x2.val[0]);
+          int16x4_t in16x4_3 = vget_high_s16(in16x8x2.val[1]);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_2, coeff16x4, 1);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_3, coeff16x4, 0);
+        }
+
+        for (; j < (int)coefficients_length; j++) {
+          int16x4_t coeff16x4 = vld1_dup_s16(&coefficients[j]);
+          int16x8x2_t in16x8x2 = vld2q_s16(&data_in[i - j]);
+
+          // Mul and accumulate low 64-bit data.
+          int16x4_t in16x4_0 = vget_low_s16(in16x8x2.val[0]);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_0, coeff16x4, 0);
+
+          // Mul and accumulate high 64-bit data.
+          // TODO: vget_high_s16 need extra cost on ARM64. This could be
+          // replaced by vmlal_high_lane_s16. But for the interface of
+          // vmlal_high_lane_s16, there is a bug in gcc 4.9.
+          // This issue need to be tracked in the future.
+          int16x4_t in16x4_1 = vget_high_s16(in16x8x2.val[0]);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_1, coeff16x4, 0);
+        }
+#else
+        // On ARMv7, the loop unrolling 2 times results in performance
+        // regression.
+        for (j = 0; j < (int)coefficients_length; j++) {
+          int16x4_t coeff16x4 = vld1_dup_s16(&coefficients[j]);
+          int16x8x2_t in16x8x2 = vld2q_s16(&data_in[i - j]);
+
+          // Mul and accumulate.
+          int16x4_t in16x4_0 = vget_low_s16(in16x8x2.val[0]);
+          int16x4_t in16x4_1 = vget_high_s16(in16x8x2.val[0]);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_0, coeff16x4, 0);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_1, coeff16x4, 0);
+        }
+#endif
+
+        // Saturate and store the output.
+        int16x4_t out16x4_0 = vqshrn_n_s32(out32x4_0, 12);
+        int16x4_t out16x4_1 = vqshrn_n_s32(out32x4_1, 12);
+        vst1q_s16(data_out, vcombine_s16(out16x4_0, out16x4_1));
+        data_out += 8;
+      }
+      break;
+    }
+    case 4: {
+      for (i = delay; i < endpos1; i += 32) {
+        // Round value, 0.5 in Q12.
+        int32x4_t out32x4_0 = vdupq_n_s32(2048);
+        int32x4_t out32x4_1 = vdupq_n_s32(2048);
+
+        // Unroll the loop 4 times.
+        for (j = 0; j < (int)coefficients_length - 3; j += 4) {
+          int16x4_t coeff16x4 = vld1_s16(&coefficients[j]);
+          int16x8x4_t in16x8x4 = vld4q_s16(&data_in[i - j - 3]);
+
+          // Mul and accumulate low 64-bit data.
+          int16x4_t in16x4_0 = vget_low_s16(in16x8x4.val[0]);
+          int16x4_t in16x4_2 = vget_low_s16(in16x8x4.val[1]);
+          int16x4_t in16x4_4 = vget_low_s16(in16x8x4.val[2]);
+          int16x4_t in16x4_6 = vget_low_s16(in16x8x4.val[3]);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_0, coeff16x4, 3);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_2, coeff16x4, 2);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_4, coeff16x4, 1);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_6, coeff16x4, 0);
+
+          // Mul and accumulate high 64-bit data.
+          // TODO: vget_high_s16 need extra cost on ARM64. This could be
+          // replaced by vmlal_high_lane_s16. But for the interface of
+          // vmlal_high_lane_s16, there is a bug in gcc 4.9.
+          // This issue need to be tracked in the future.
+          int16x4_t in16x4_1 = vget_high_s16(in16x8x4.val[0]);
+          int16x4_t in16x4_3 = vget_high_s16(in16x8x4.val[1]);
+          int16x4_t in16x4_5 = vget_high_s16(in16x8x4.val[2]);
+          int16x4_t in16x4_7 = vget_high_s16(in16x8x4.val[3]);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_1, coeff16x4, 3);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_3, coeff16x4, 2);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_5, coeff16x4, 1);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_7, coeff16x4, 0);
+        }
+
+        for (; j < (int)coefficients_length; j++) {
+          int16x4_t coeff16x4 = vld1_dup_s16(&coefficients[j]);
+          int16x8x4_t in16x8x4 = vld4q_s16(&data_in[i - j]);
+
+          // Mul and accumulate low 64-bit data.
+          int16x4_t in16x4_0 = vget_low_s16(in16x8x4.val[0]);
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_0, coeff16x4, 0);
+
+          // Mul and accumulate high 64-bit data.
+          // TODO: vget_high_s16 need extra cost on ARM64. This could be
+          // replaced by vmlal_high_lane_s16. But for the interface of
+          // vmlal_high_lane_s16, there is a bug in gcc 4.9.
+          // This issue need to be tracked in the future.
+          int16x4_t in16x4_1 = vget_high_s16(in16x8x4.val[0]);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_1, coeff16x4, 0);
+        }
+
+        // Saturate and store the output.
+        int16x4_t out16x4_0 = vqshrn_n_s32(out32x4_0, 12);
+        int16x4_t out16x4_1 = vqshrn_n_s32(out32x4_1, 12);
+        vst1q_s16(data_out, vcombine_s16(out16x4_0, out16x4_1));
+        data_out += 8;
+      }
+      break;
+    }
+    default: {
+      for (i = delay; i < endpos1; i += factor * 8) {
+        // Round value, 0.5 in Q12.
+        int32x4_t out32x4_0 = vdupq_n_s32(2048);
+        int32x4_t out32x4_1 = vdupq_n_s32(2048);
+
+        for (j = 0; j < (int)coefficients_length; j++) {
+          int16x4_t coeff16x4 = vld1_dup_s16(&coefficients[j]);
+          int16x4_t in16x4_0 = vld1_dup_s16(&data_in[i - j]);
+          in16x4_0 = vld1_lane_s16(&data_in[i + factor - j], in16x4_0, 1);
+          in16x4_0 = vld1_lane_s16(&data_in[i + factor * 2 - j], in16x4_0, 2);
+          in16x4_0 = vld1_lane_s16(&data_in[i + factor * 3 - j], in16x4_0, 3);
+          int16x4_t in16x4_1 = vld1_dup_s16(&data_in[i + factor * 4 - j]);
+          in16x4_1 = vld1_lane_s16(&data_in[i + factor * 5 - j], in16x4_1, 1);
+          in16x4_1 = vld1_lane_s16(&data_in[i + factor * 6 - j], in16x4_1, 2);
+          in16x4_1 = vld1_lane_s16(&data_in[i + factor * 7 - j], in16x4_1, 3);
+
+          // Mul and accumulate.
+          out32x4_0 = vmlal_lane_s16(out32x4_0, in16x4_0, coeff16x4, 0);
+          out32x4_1 = vmlal_lane_s16(out32x4_1, in16x4_1, coeff16x4, 0);
+        }
+
+        // Saturate and store the output.
+        int16x4_t out16x4_0 = vqshrn_n_s32(out32x4_0, 12);
+        int16x4_t out16x4_1 = vqshrn_n_s32(out32x4_1, 12);
+        vst1q_s16(data_out, vcombine_s16(out16x4_0, out16x4_1));
+        data_out += 8;
+      }
+      break;
+    }
+  }
+
+  // Second part, do the rest iterations (if any).
+  for (; i < endpos; i += factor) {
+    out_s32 = 2048;  // Round value, 0.5 in Q12.
+
+    for (j = 0; j < (int)coefficients_length; j++) {
+      out_s32 = WebRtc_MulAccumW16(coefficients[j], data_in[i - j], out_s32);
+    }
+
+    // Saturate and store the output.
+    out_s32 >>= 12;
+    *data_out++ = WebRtcSpl_SatW32ToW16(out_s32);
+  }
+
+  return 0;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/energy.c b/third_party/libwebrtc/common_audio/signal_processing/energy.c
new file mode 100644
index 0000000000..5cce6b8777
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/energy.c
@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_Energy().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+int32_t WebRtcSpl_Energy(int16_t* vector,
+                         size_t vector_length,
+                         int* scale_factor)
+{
+    int32_t en = 0;
+    size_t i;
+    int scaling =
+        WebRtcSpl_GetScalingSquare(vector, vector_length, vector_length);
+    size_t looptimes = vector_length;
+    int16_t *vectorptr = vector;
+
+    for (i = 0; i < looptimes; i++)
+    {
+      en += (*vectorptr * *vectorptr) >> scaling;
+      vectorptr++;
+    }
+    *scale_factor = scaling;
+
+    return en;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/filter_ar.c b/third_party/libwebrtc/common_audio/signal_processing/filter_ar.c
new file mode 100644
index 0000000000..b1f666d723
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/filter_ar.c
@@ -0,0 +1,95 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_FilterAR().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#include "rtc_base/checks.h"
+
+size_t WebRtcSpl_FilterAR(const int16_t* a,
+                          size_t a_length,
+                          const int16_t* x,
+                          size_t x_length,
+                          int16_t* state,
+                          size_t state_length,
+                          int16_t* state_low,
+                          size_t state_low_length,
+                          int16_t* filtered,
+                          int16_t* filtered_low,
+                          size_t filtered_low_length)
+{
+    int64_t o;
+    int32_t oLOW;
+    size_t i, j, stop;
+    const int16_t* x_ptr = &x[0];
+    int16_t* filteredFINAL_ptr = filtered;
+    int16_t* filteredFINAL_LOW_ptr = filtered_low;
+
+    for (i = 0; i < x_length; i++)
+    {
+        // Calculate filtered[i] and filtered_low[i]
+        const int16_t* a_ptr = &a[1];
+        // The index can become negative, but the arrays will never be indexed
+        // with it when negative. Nevertheless, the index cannot be a size_t
+        // because of this.
+        int filtered_ix = (int)i - 1;
+        int16_t* state_ptr = &state[state_length - 1];
+        int16_t* state_low_ptr = &state_low[state_length - 1];
+
+        o = (int32_t)(*x_ptr++) * (1 << 12);
+        oLOW = (int32_t)0;
+
+        stop = (i < a_length) ? i + 1 : a_length;
+        for (j = 1; j < stop; j++)
+        {
+          RTC_DCHECK_GE(filtered_ix, 0);
+          o -= *a_ptr * filtered[filtered_ix];
+          oLOW -= *a_ptr++ * filtered_low[filtered_ix];
+          --filtered_ix;
+        }
+        for (j = i + 1; j < a_length; j++)
+        {
+          o -= *a_ptr * *state_ptr--;
+          oLOW -= *a_ptr++ * *state_low_ptr--;
+        }
+
+        o += (oLOW >> 12);
+        *filteredFINAL_ptr = (int16_t)((o + (int32_t)2048) >> 12);
+        *filteredFINAL_LOW_ptr++ =
+            (int16_t)(o - ((int32_t)(*filteredFINAL_ptr++) * (1 << 12)));
+    }
+
+    // Save the filter state
+    if (x_length >= state_length)
+    {
+        WebRtcSpl_CopyFromEndW16(filtered, x_length, a_length - 1, state);
+        WebRtcSpl_CopyFromEndW16(filtered_low, x_length, a_length - 1, state_low);
+    } else
+    {
+        for (i = 0; i < state_length - x_length; i++)
+        {
+            state[i] = state[i + x_length];
+            state_low[i] = state_low[i + x_length];
+        }
+        for (i = 0; i < x_length; i++)
+        {
+            state[state_length - x_length + i] = filtered[i];
+            state_low[state_length - x_length + i] = filtered_low[i];
+        }
+    }
+
+    return x_length;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c b/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c
new file mode 100644
index 0000000000..8b8bdb1af5
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12.c
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "stddef.h"
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// TODO(bjornv): Change the return type to report errors.
+
+void WebRtcSpl_FilterARFastQ12(const int16_t* data_in,
+                               int16_t* data_out,
+                               const int16_t* __restrict coefficients,
+                               size_t coefficients_length,
+                               size_t data_length) {
+  size_t i = 0;
+  size_t j = 0;
+
+  RTC_DCHECK_GT(data_length, 0);
+  RTC_DCHECK_GT(coefficients_length, 1);
+
+  for (i = 0; i < data_length; i++) {
+    int64_t output = 0;
+    int64_t sum = 0;
+
+    for (j = coefficients_length - 1; j > 0; j--) {
+      // Negative overflow is permitted here, because this is
+      // auto-regressive filters, and the state for each batch run is
+      // stored in the "negative" positions of the output vector.
+      sum += coefficients[j] * data_out[(ptrdiff_t) i - (ptrdiff_t) j];
+    }
+
+    output = coefficients[0] * data_in[i];
+    output -= sum;
+
+    // Saturate and store the output.
+    output = WEBRTC_SPL_SAT(134215679, output, -134217728);
+    data_out[i] = (int16_t)((output + 2048) >> 12);
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_armv7.S b/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_armv7.S
new file mode 100644
index 0000000000..60319d29ff
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_armv7.S
@@ -0,0 +1,218 @@
+@
+@ Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+@
+@ Use of this source code is governed by a BSD-style license
+@ that can be found in the LICENSE file in the root of the source
+@ tree. An additional intellectual property rights grant can be found
+@ in the file PATENTS.  All contributing project authors may
+@ be found in the AUTHORS file in the root of the source tree.
+@
+
+@ This file contains the function WebRtcSpl_FilterARFastQ12(), optimized for
+@ ARMv7  platform. The description header can be found in
+@ signal_processing_library.h
+@
+@ Output is bit-exact with the generic C code as in filter_ar_fast_q12.c, and
+@ the reference C code at end of this file.
+
+@ Assumptions:
+@ (1) data_length > 0
+@ (2) coefficients_length > 1
+
+@ Register usage:
+@
+@ r0:  &data_in[i]
+@ r1:  &data_out[i], for result ouput
+@ r2:  &coefficients[0]
+@ r3:  coefficients_length
+@ r4:  Iteration counter for the outer loop.
+@ r5:  data_out[j] as multiplication inputs
+@ r6:  Calculated value for output data_out[]; interation counter for inner loop
+@ r7:  Partial sum of a filtering multiplication results
+@ r8:  Partial sum of a filtering multiplication results
+@ r9:  &data_out[], for filtering input; data_in[i]
+@ r10: coefficients[j]
+@ r11: Scratch
+@ r12: &coefficients[j]
+
+#include "rtc_base/system/asm_defines.h"
+
+GLOBAL_FUNCTION WebRtcSpl_FilterARFastQ12
+.align  2
+DEFINE_FUNCTION WebRtcSpl_FilterARFastQ12
+  push {r4-r11}
+
+  ldrsh r12, [sp, #32]         @ data_length
+  subs r4, r12, #1
+  beq ODD_LENGTH               @ jump if data_length == 1
+
+LOOP_LENGTH:
+  add r12, r2, r3, lsl #1
+  sub r12, #4                  @ &coefficients[coefficients_length - 2]
+  sub r9, r1, r3, lsl #1
+  add r9, #2                   @ &data_out[i - coefficients_length + 1]
+  ldr r5, [r9], #4             @ data_out[i - coefficients_length + {1,2}]
+
+  mov r7, #0                   @ sum1
+  mov r8, #0                   @ sum2
+  subs r6, r3, #3              @ Iteration counter for inner loop.
+  beq ODD_A_LENGTH             @ branch if coefficients_length == 3
+  blt POST_LOOP_A_LENGTH       @ branch if coefficients_length == 2
+
+LOOP_A_LENGTH:
+  ldr r10, [r12], #-4          @ coefficients[j - 1], coefficients[j]
+  subs r6, #2
+  smlatt r8, r10, r5, r8       @ sum2 += coefficients[j] * data_out[i - j + 1];
+  smlatb r7, r10, r5, r7       @ sum1 += coefficients[j] * data_out[i - j];
+  smlabt r7, r10, r5, r7       @ coefficients[j - 1] * data_out[i - j + 1];
+  ldr r5, [r9], #4             @ data_out[i - j + 2],  data_out[i - j + 3]
+  smlabb r8, r10, r5, r8       @ coefficients[j - 1] * data_out[i - j + 2];
+  bgt LOOP_A_LENGTH
+  blt POST_LOOP_A_LENGTH
+
+ODD_A_LENGTH:
+  ldrsh r10, [r12, #2]         @ Filter coefficients coefficients[2]
+  sub r12, #2                  @ &coefficients[0]
+  smlabb r7, r10, r5, r7       @ sum1 += coefficients[2] * data_out[i - 2];
+  smlabt r8, r10, r5, r8       @ sum2 += coefficients[2] * data_out[i - 1];
+  ldr r5, [r9, #-2]            @ data_out[i - 1],  data_out[i]
+
+POST_LOOP_A_LENGTH:
+  ldr r10, [r12]               @ coefficients[0], coefficients[1]
+  smlatb r7, r10, r5, r7       @ sum1 += coefficients[1] * data_out[i - 1];
+
+  ldr r9, [r0], #4             @ data_in[i], data_in[i + 1]
+  smulbb r6, r10, r9           @ output1 = coefficients[0] * data_in[i];
+  sub r6, r7                   @ output1 -= sum1;
+
+  sbfx r11, r6, #12, #16
+  ssat r7, #16, r6, asr #12
+  cmp r7, r11
+  addeq r6, r6, #2048
+  ssat r6, #16, r6, asr #12
+  strh r6, [r1], #2            @ Store data_out[i]
+
+  smlatb r8, r10, r6, r8       @ sum2 += coefficients[1] * data_out[i];
+  smulbt r6, r10, r9           @ output2 = coefficients[0] * data_in[i + 1];
+  sub r6, r8                   @ output1 -= sum1;
+
+  sbfx r11, r6, #12, #16
+  ssat r7, #16, r6, asr #12
+  cmp r7, r11
+  addeq r6, r6, #2048
+  ssat r6, #16, r6, asr #12
+  strh r6, [r1], #2            @ Store data_out[i + 1]
+
+  subs r4, #2
+  bgt LOOP_LENGTH
+  blt END                      @ For even data_length, it's done. Jump to END.
+
+@ Process i = data_length -1, for the case of an odd length.
+ODD_LENGTH:
+  add r12, r2, r3, lsl #1
+  sub r12, #4                  @ &coefficients[coefficients_length - 2]
+  sub r9, r1, r3, lsl #1
+  add r9, #2                   @ &data_out[i - coefficients_length + 1]
+  mov r7, #0                   @ sum1
+  mov r8, #0                   @ sum1
+  subs r6, r3, #2              @ inner loop counter
+  beq EVEN_A_LENGTH            @ branch if coefficients_length == 2
+
+LOOP2_A_LENGTH:
+  ldr r10, [r12], #-4          @ coefficients[j - 1], coefficients[j]
+  ldr r5, [r9], #4             @ data_out[i - j],  data_out[i - j + 1]
+  subs r6, #2
+  smlatb r7, r10, r5, r7       @ sum1 += coefficients[j] * data_out[i - j];
+  smlabt r8, r10, r5, r8       @ coefficients[j - 1] * data_out[i - j + 1];
+  bgt LOOP2_A_LENGTH
+  addlt r12, #2
+  blt POST_LOOP2_A_LENGTH
+
+EVEN_A_LENGTH:
+  ldrsh r10, [r12, #2]         @ Filter coefficients coefficients[1]
+  ldrsh r5, [r9]               @ data_out[i - 1]
+  smlabb r7, r10, r5, r7       @ sum1 += coefficients[1] * data_out[i - 1];
+
+POST_LOOP2_A_LENGTH:
+  ldrsh r10, [r12]             @ Filter coefficients coefficients[0]
+  ldrsh r9, [r0]               @ data_in[i]
+  smulbb r6, r10, r9           @ output1 = coefficients[0] * data_in[i];
+  sub r6, r7                   @ output1 -= sum1;
+  sub r6, r8                   @ output1 -= sum1;
+  sbfx r8, r6, #12, #16
+  ssat r7, #16, r6, asr #12
+  cmp r7, r8
+  addeq r6, r6, #2048
+  ssat r6, #16, r6, asr #12
+  strh r6, [r1]                @ Store the data_out[i]
+
+END:
+  pop {r4-r11}
+  bx  lr
+
+@Reference C code:
+@
+@void WebRtcSpl_FilterARFastQ12(int16_t* data_in,
+@                               int16_t* data_out,
+@                               int16_t* __restrict coefficients,
+@                               size_t coefficients_length,
+@                               size_t data_length) {
+@  size_t i = 0;
+@  size_t j = 0;
+@
+@  assert(data_length > 0);
+@  assert(coefficients_length > 1);
+@
+@  for (i = 0; i < data_length - 1; i += 2) {
+@    int32_t output1 = 0;
+@    int32_t sum1 = 0;
+@    int32_t output2 = 0;
+@    int32_t sum2 = 0;
+@
+@    for (j = coefficients_length - 1; j > 2; j -= 2) {
+@      sum1 += coefficients[j]      * data_out[i - j];
+@      sum1 += coefficients[j - 1]  * data_out[i - j + 1];
+@      sum2 += coefficients[j]     * data_out[i - j + 1];
+@      sum2 += coefficients[j - 1] * data_out[i - j + 2];
+@    }
+@
+@    if (j == 2) {
+@      sum1 += coefficients[2] * data_out[i - 2];
+@      sum2 += coefficients[2] * data_out[i - 1];
+@    }
+@
+@    sum1 += coefficients[1] * data_out[i - 1];
+@    output1 = coefficients[0] * data_in[i];
+@    output1 -= sum1;
+@    // Saturate and store the output.
+@    output1 = WEBRTC_SPL_SAT(134215679, output1, -134217728);
+@    data_out[i] = (int16_t)((output1 + 2048) >> 12);
+@
+@    sum2 += coefficients[1] * data_out[i];
+@    output2 = coefficients[0] * data_in[i + 1];
+@    output2 -= sum2;
+@    // Saturate and store the output.
+@    output2 = WEBRTC_SPL_SAT(134215679, output2, -134217728);
+@    data_out[i + 1] = (int16_t)((output2 + 2048) >> 12);
+@  }
+@
+@  if (i == data_length - 1) {
+@    int32_t output1 = 0;
+@    int32_t sum1 = 0;
+@
+@    for (j = coefficients_length - 1; j > 1; j -= 2) {
+@      sum1 += coefficients[j]      * data_out[i - j];
+@      sum1 += coefficients[j - 1]  * data_out[i - j + 1];
+@    }
+@
+@    if (j == 1) {
+@      sum1 += coefficients[1] * data_out[i - 1];
+@    }
+@
+@    output1 = coefficients[0] * data_in[i];
+@    output1 -= sum1;
+@    // Saturate and store the output.
+@    output1 = WEBRTC_SPL_SAT(134215679, output1, -134217728);
+@    data_out[i] = (int16_t)((output1 + 2048) >> 12);
+@  }
+@}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_mips.c b/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_mips.c
new file mode 100644
index 0000000000..b9ad30f006
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/filter_ar_fast_q12_mips.c
@@ -0,0 +1,140 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_FilterARFastQ12(const int16_t* data_in,
+                               int16_t* data_out,
+                               const int16_t* __restrict coefficients,
+                               size_t coefficients_length,
+                               size_t data_length) {
+  int r0, r1, r2, r3;
+  int coef0, offset;
+  int i, j, k;
+  int coefptr, outptr, tmpout, inptr;
+#if !defined(MIPS_DSP_R1_LE)
+  int max16 = 0x7FFF;
+  int min16 = 0xFFFF8000;
+#endif  // #if !defined(MIPS_DSP_R1_LE)
+
+  RTC_DCHECK_GT(data_length, 0);
+  RTC_DCHECK_GT(coefficients_length, 1);
+
+  __asm __volatile (
+    ".set       push                                             \n\t"
+    ".set       noreorder                                        \n\t"
+    "addiu      %[i],       %[data_length],          0           \n\t"
+    "lh         %[coef0],   0(%[coefficients])                   \n\t"
+    "addiu      %[j],       %[coefficients_length],  -1          \n\t"
+    "andi       %[k],       %[j],                    1           \n\t"
+    "sll        %[offset],  %[j],                    1           \n\t"
+    "subu       %[outptr],  %[data_out],             %[offset]   \n\t"
+    "addiu      %[inptr],   %[data_in],              0           \n\t"
+    "bgtz       %[k],       3f                                   \n\t"
+    " addu      %[coefptr], %[coefficients],         %[offset]   \n\t"
+   "1:                                                           \n\t"
+    "lh         %[r0],      0(%[inptr])                          \n\t"
+    "addiu      %[i],       %[i],                    -1          \n\t"
+    "addiu      %[tmpout],  %[outptr],               0           \n\t"
+    "mult       %[r0],      %[coef0]                             \n\t"
+   "2:                                                           \n\t"
+    "lh         %[r0],      0(%[tmpout])                         \n\t"
+    "lh         %[r1],      0(%[coefptr])                        \n\t"
+    "lh         %[r2],      2(%[tmpout])                         \n\t"
+    "lh         %[r3],      -2(%[coefptr])                       \n\t"
+    "addiu      %[tmpout],  %[tmpout],               4           \n\t"
+    "msub       %[r0],      %[r1]                                \n\t"
+    "msub       %[r2],      %[r3]                                \n\t"
+    "addiu      %[j],       %[j],                    -2          \n\t"
+    "bgtz       %[j],       2b                                   \n\t"
+    " addiu     %[coefptr], %[coefptr],              -4          \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "extr_r.w   %[r0],      $ac0,                    12          \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "mflo       %[r0]                                            \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+    "addu       %[coefptr], %[coefficients],         %[offset]   \n\t"
+    "addiu      %[inptr],   %[inptr],                2           \n\t"
+    "addiu      %[j],       %[coefficients_length],  -1          \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "shll_s.w   %[r0],      %[r0],                   16          \n\t"
+    "sra        %[r0],      %[r0],                   16          \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "addiu      %[r0],      %[r0],                   2048        \n\t"
+    "sra        %[r0],      %[r0],                   12          \n\t"
+    "slt        %[r1],      %[max16],                %[r0]       \n\t"
+    "movn       %[r0],      %[max16],                %[r1]       \n\t"
+    "slt        %[r1],      %[r0],                   %[min16]    \n\t"
+    "movn       %[r0],      %[min16],                %[r1]       \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+    "sh         %[r0],      0(%[tmpout])                         \n\t"
+    "bgtz       %[i],       1b                                   \n\t"
+    " addiu     %[outptr],  %[outptr],               2           \n\t"
+    "b          5f                                               \n\t"
+    " nop                                                        \n\t"
+   "3:                                                           \n\t"
+    "lh         %[r0],      0(%[inptr])                          \n\t"
+    "addiu      %[i],       %[i],                    -1          \n\t"
+    "addiu      %[tmpout],  %[outptr],               0           \n\t"
+    "mult       %[r0],      %[coef0]                             \n\t"
+   "4:                                                           \n\t"
+    "lh         %[r0],      0(%[tmpout])                         \n\t"
+    "lh         %[r1],      0(%[coefptr])                        \n\t"
+    "lh         %[r2],      2(%[tmpout])                         \n\t"
+    "lh         %[r3],      -2(%[coefptr])                       \n\t"
+    "addiu      %[tmpout],  %[tmpout],               4           \n\t"
+    "msub       %[r0],      %[r1]                                \n\t"
+    "msub       %[r2],      %[r3]                                \n\t"
+    "addiu      %[j],       %[j],                    -2          \n\t"
+    "bgtz       %[j],       4b                                   \n\t"
+    " addiu     %[coefptr], %[coefptr],              -4          \n\t"
+    "lh         %[r0],      0(%[tmpout])                         \n\t"
+    "lh         %[r1],      0(%[coefptr])                        \n\t"
+    "msub       %[r0],      %[r1]                                \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "extr_r.w   %[r0],      $ac0,                    12          \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "mflo       %[r0]                                            \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+    "addu       %[coefptr], %[coefficients],         %[offset]   \n\t"
+    "addiu      %[inptr],   %[inptr],                2           \n\t"
+    "addiu      %[j],       %[coefficients_length],  -1          \n\t"
+#if defined(MIPS_DSP_R1_LE)
+    "shll_s.w   %[r0],      %[r0],                   16          \n\t"
+    "sra        %[r0],      %[r0],                   16          \n\t"
+#else  // #if defined(MIPS_DSP_R1_LE)
+    "addiu      %[r0],      %[r0],                   2048        \n\t"
+    "sra        %[r0],      %[r0],                   12          \n\t"
+    "slt        %[r1],      %[max16],                %[r0]       \n\t"
+    "movn       %[r0],      %[max16],                %[r1]       \n\t"
+    "slt        %[r1],      %[r0],                   %[min16]    \n\t"
+    "movn       %[r0],      %[min16],                %[r1]       \n\t"
+#endif  // #if defined(MIPS_DSP_R1_LE)
+    "sh         %[r0],      2(%[tmpout])                         \n\t"
+    "bgtz       %[i],       3b                                   \n\t"
+    " addiu     %[outptr],  %[outptr],               2           \n\t"
+   "5:                                                           \n\t"
+    ".set       pop                                              \n\t"
+    : [i] "=&r" (i), [j] "=&r" (j), [k] "=&r" (k), [r0] "=&r" (r0),
+      [r1] "=&r" (r1), [r2] "=&r" (r2), [r3] "=&r" (r3),
+      [coef0] "=&r" (coef0), [offset] "=&r" (offset),
+      [outptr] "=&r" (outptr), [inptr] "=&r" (inptr),
+      [coefptr] "=&r" (coefptr), [tmpout] "=&r" (tmpout)
+    : [coefficients] "r" (coefficients), [data_length] "r" (data_length),
+      [coefficients_length] "r" (coefficients_length),
+#if !defined(MIPS_DSP_R1_LE)
+      [max16] "r" (max16), [min16] "r" (min16),
+#endif
+      [data_out] "r" (data_out), [data_in] "r" (data_in)
+    : "hi", "lo", "memory"
+  );
+}
+
diff --git a/third_party/libwebrtc/common_audio/signal_processing/filter_ma_fast_q12.c b/third_party/libwebrtc/common_audio/signal_processing/filter_ma_fast_q12.c
new file mode 100644
index 0000000000..329d47e14f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/filter_ma_fast_q12.c
@@ -0,0 +1,55 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_FilterMAFastQ12().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#include "rtc_base/sanitizer.h"
+
+void WebRtcSpl_FilterMAFastQ12(const int16_t* in_ptr,
+                               int16_t* out_ptr,
+                               const int16_t* B,
+                               size_t B_length,
+                               size_t length)
+{
+    size_t i, j;
+
+    rtc_MsanCheckInitialized(B, sizeof(B[0]), B_length);
+    rtc_MsanCheckInitialized(in_ptr - B_length + 1, sizeof(in_ptr[0]),
+                             B_length + length - 1);
+
+    for (i = 0; i < length; i++)
+    {
+        int32_t o = 0;
+
+        for (j = 0; j < B_length; j++)
+        {
+          // Negative overflow is permitted here, because this is
+          // auto-regressive filters, and the state for each batch run is
+          // stored in the "negative" positions of the output vector.
+          o += B[j] * in_ptr[(ptrdiff_t) i - (ptrdiff_t) j];
+        }
+
+        // If output is higher than 32768, saturate it. Same with negative side
+        // 2^27 = 134217728, which corresponds to 32768 in Q12
+
+        // Saturate the output
+        o = WEBRTC_SPL_SAT((int32_t)134215679, o, (int32_t)-134217728);
+
+        *out_ptr++ = (int16_t)((o + (int32_t)2048) >> 12);
+    }
+    return;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/get_hanning_window.c b/third_party/libwebrtc/common_audio/signal_processing/get_hanning_window.c
new file mode 100644
index 0000000000..8f29da8d9b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/get_hanning_window.c
@@ -0,0 +1,77 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_GetHanningWindow().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// Hanning table with 256 entries
+static const int16_t kHanningTable[] = {
+    1,      2,      6,     10,     15,     22,     30,     39,
+   50,     62,     75,     89,    104,    121,    138,    157,
+  178,    199,    222,    246,    271,    297,    324,    353,
+  383,    413,    446,    479,    513,    549,    586,    624,
+  663,    703,    744,    787,    830,    875,    920,    967,
+ 1015,   1064,   1114,   1165,   1218,   1271,   1325,   1381,
+ 1437,   1494,   1553,   1612,   1673,   1734,   1796,   1859,
+ 1924,   1989,   2055,   2122,   2190,   2259,   2329,   2399,
+ 2471,   2543,   2617,   2691,   2765,   2841,   2918,   2995,
+ 3073,   3152,   3232,   3312,   3393,   3475,   3558,   3641,
+ 3725,   3809,   3895,   3980,   4067,   4154,   4242,   4330,
+ 4419,   4509,   4599,   4689,   4781,   4872,   4964,   5057,
+ 5150,   5244,   5338,   5432,   5527,   5622,   5718,   5814,
+ 5910,   6007,   6104,   6202,   6299,   6397,   6495,   6594,
+ 6693,   6791,   6891,   6990,   7090,   7189,   7289,   7389,
+ 7489,   7589,   7690,   7790,   7890,   7991,   8091,   8192,
+ 8293,   8393,   8494,   8594,   8694,   8795,   8895,   8995,
+ 9095,   9195,   9294,   9394,   9493,   9593,   9691,   9790,
+ 9889,   9987,  10085,  10182,  10280,  10377,  10474,  10570,
+10666,  10762,  10857,  10952,  11046,  11140,  11234,  11327,
+11420,  11512,  11603,  11695,  11785,  11875,  11965,  12054,
+12142,  12230,  12317,  12404,  12489,  12575,  12659,  12743,
+12826,  12909,  12991,  13072,  13152,  13232,  13311,  13389,
+13466,  13543,  13619,  13693,  13767,  13841,  13913,  13985,
+14055,  14125,  14194,  14262,  14329,  14395,  14460,  14525,
+14588,  14650,  14711,  14772,  14831,  14890,  14947,  15003,
+15059,  15113,  15166,  15219,  15270,  15320,  15369,  15417,
+15464,  15509,  15554,  15597,  15640,  15681,  15721,  15760,
+15798,  15835,  15871,  15905,  15938,  15971,  16001,  16031,
+16060,  16087,  16113,  16138,  16162,  16185,  16206,  16227,
+16246,  16263,  16280,  16295,  16309,  16322,  16334,  16345,
+16354,  16362,  16369,  16374,  16378,  16382,  16383,  16384
+};
+
+void WebRtcSpl_GetHanningWindow(int16_t *v, size_t size)
+{
+    size_t jj;
+    int16_t *vptr1;
+
+    int32_t index;
+    int32_t factor = ((int32_t)0x40000000);
+
+    factor = WebRtcSpl_DivW32W16(factor, (int16_t)size);
+    if (size < 513)
+        index = (int32_t)-0x200000;
+    else
+        index = (int32_t)-0x100000;
+    vptr1 = v;
+
+    for (jj = 0; jj < size; jj++)
+    {
+        index += factor;
+        (*vptr1++) = kHanningTable[index >> 22];
+    }
+
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/get_scaling_square.c b/third_party/libwebrtc/common_audio/signal_processing/get_scaling_square.c
new file mode 100644
index 0000000000..4eb126941e
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/get_scaling_square.c
@@ -0,0 +1,46 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_GetScalingSquare().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+int16_t WebRtcSpl_GetScalingSquare(int16_t* in_vector,
+                                   size_t in_vector_length,
+                                   size_t times)
+{
+    int16_t nbits = WebRtcSpl_GetSizeInBits((uint32_t)times);
+    size_t i;
+    int16_t smax = -1;
+    int16_t sabs;
+    int16_t *sptr = in_vector;
+    int16_t t;
+    size_t looptimes = in_vector_length;
+
+    for (i = looptimes; i > 0; i--)
+    {
+        sabs = (*sptr > 0 ? *sptr++ : -*sptr++);
+        smax = (sabs > smax ? sabs : smax);
+    }
+    t = WebRtcSpl_NormW32(WEBRTC_SPL_MUL(smax, smax));
+
+    if (smax == 0)
+    {
+        return 0; // Since norm(0) returns 0
+    } else
+    {
+        return (t > nbits) ? 0 : nbits - t;
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/ilbc_specific_functions.c b/third_party/libwebrtc/common_audio/signal_processing/ilbc_specific_functions.c
new file mode 100644
index 0000000000..cbdd3dcbcd
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/ilbc_specific_functions.c
@@ -0,0 +1,90 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains implementations of the iLBC specific functions
+ * WebRtcSpl_ReverseOrderMultArrayElements()
+ * WebRtcSpl_ElementwiseVectorMult()
+ * WebRtcSpl_AddVectorsAndShift()
+ * WebRtcSpl_AddAffineVectorToVector()
+ * WebRtcSpl_AffineTransformVector()
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_ReverseOrderMultArrayElements(int16_t *out, const int16_t *in,
+                                             const int16_t *win,
+                                             size_t vector_length,
+                                             int16_t right_shifts)
+{
+    size_t i;
+    int16_t *outptr = out;
+    const int16_t *inptr = in;
+    const int16_t *winptr = win;
+    for (i = 0; i < vector_length; i++)
+    {
+      *outptr++ = (int16_t)((*inptr++ * *winptr--) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_ElementwiseVectorMult(int16_t *out, const int16_t *in,
+                                     const int16_t *win, size_t vector_length,
+                                     int16_t right_shifts)
+{
+    size_t i;
+    int16_t *outptr = out;
+    const int16_t *inptr = in;
+    const int16_t *winptr = win;
+    for (i = 0; i < vector_length; i++)
+    {
+      *outptr++ = (int16_t)((*inptr++ * *winptr++) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_AddVectorsAndShift(int16_t *out, const int16_t *in1,
+                                  const int16_t *in2, size_t vector_length,
+                                  int16_t right_shifts)
+{
+    size_t i;
+    int16_t *outptr = out;
+    const int16_t *in1ptr = in1;
+    const int16_t *in2ptr = in2;
+    for (i = vector_length; i > 0; i--)
+    {
+        (*outptr++) = (int16_t)(((*in1ptr++) + (*in2ptr++)) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_AddAffineVectorToVector(int16_t *out, const int16_t *in,
+                                       int16_t gain, int32_t add_constant,
+                                       int16_t right_shifts,
+                                       size_t vector_length)
+{
+    size_t i;
+
+    for (i = 0; i < vector_length; i++)
+    {
+      out[i] += (int16_t)((in[i] * gain + add_constant) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_AffineTransformVector(int16_t *out, const int16_t *in,
+                                     int16_t gain, int32_t add_constant,
+                                     int16_t right_shifts, size_t vector_length)
+{
+    size_t i;
+
+    for (i = 0; i < vector_length; i++)
+    {
+      out[i] = (int16_t)((in[i] * gain + add_constant) >> right_shifts);
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/include/real_fft.h b/third_party/libwebrtc/common_audio/signal_processing/include/real_fft.h
new file mode 100644
index 0000000000..a0da5096c1
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/include/real_fft.h
@@ -0,0 +1,96 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
+
+#include <stdint.h>
+
+// For ComplexFFT(), the maximum fft order is 10;
+// WebRTC APM uses orders of only 7 and 8.
+enum { kMaxFFTOrder = 10 };
+
+struct RealFFT;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct RealFFT* WebRtcSpl_CreateRealFFT(int order);
+void WebRtcSpl_FreeRealFFT(struct RealFFT* self);
+
+// Compute an FFT for a real-valued signal of length of 2^order,
+// where 1 < order <= MAX_FFT_ORDER. Transform length is determined by the
+// specification structure, which must be initialized prior to calling the FFT
+// function with WebRtcSpl_CreateRealFFT().
+// The relationship between the input and output sequences can
+// be expressed in terms of the DFT, i.e.:
+//     x[n] = (2^(-scalefactor)/N)  . SUM[k=0,...,N-1] X[k].e^(jnk.2.pi/N)
+//     n=0,1,2,...N-1
+//     N=2^order.
+// The conjugate-symmetric output sequence is represented using a CCS vector,
+// which is of length N+2, and is organized as follows:
+//     Index:      0  1  2  3  4  5   . . .   N-2       N-1       N       N+1
+//     Component:  R0 0  R1 I1 R2 I2  . . .   R[N/2-1]  I[N/2-1]  R[N/2]  0
+// where R[n] and I[n], respectively, denote the real and imaginary components
+// for FFT bin 'n'. Bins  are numbered from 0 to N/2, where N is the FFT length.
+// Bin index 0 corresponds to the DC component, and bin index N/2 corresponds to
+// the foldover frequency.
+//
+// Input Arguments:
+//   self - pointer to preallocated and initialized FFT specification structure.
+//   real_data_in - the input signal. For an ARM Neon platform, it must be
+//                  aligned on a 32-byte boundary.
+//
+// Output Arguments:
+//   complex_data_out - the output complex signal with (2^order + 2) 16-bit
+//                      elements. For an ARM Neon platform, it must be different
+//                      from real_data_in, and aligned on a 32-byte boundary.
+//
+// Return Value:
+//   0  - FFT calculation is successful.
+//   -1 - Error with bad arguments (null pointers).
+int WebRtcSpl_RealForwardFFT(struct RealFFT* self,
+                             const int16_t* real_data_in,
+                             int16_t* complex_data_out);
+
+// Compute the inverse FFT for a conjugate-symmetric input sequence of length of
+// 2^order, where 1 < order <= MAX_FFT_ORDER. Transform length is determined by
+// the specification structure, which must be initialized prior to calling the
+// FFT function with WebRtcSpl_CreateRealFFT().
+// For a transform of length M, the input sequence is represented using a packed
+// CCS vector of length M+2, which is explained in the comments for
+// WebRtcSpl_RealForwardFFTC above.
+//
+// Input Arguments:
+//   self - pointer to preallocated and initialized FFT specification structure.
+//   complex_data_in - the input complex signal with (2^order + 2) 16-bit
+//                     elements. For an ARM Neon platform, it must be aligned on
+//                     a 32-byte boundary.
+//
+// Output Arguments:
+//   real_data_out - the output real signal. For an ARM Neon platform, it must
+//                   be different to complex_data_in, and aligned on a 32-byte
+//                   boundary.
+//
+// Return Value:
+//   0 or a positive number - a value that the elements in the `real_data_out`
+//                            should be shifted left with in order to get
+//                            correct physical values.
+//   -1 - Error with bad arguments (null pointers).
+int WebRtcSpl_RealInverseFFT(struct RealFFT* self,
+                             const int16_t* complex_data_in,
+                             int16_t* real_data_out);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_REAL_FFT_H_
diff --git a/third_party/libwebrtc/common_audio/signal_processing/include/signal_processing_library.h b/third_party/libwebrtc/common_audio/signal_processing/include/signal_processing_library.h
new file mode 100644
index 0000000000..48c9b309b4
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/include/signal_processing_library.h
@@ -0,0 +1,1635 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This header file includes all of the fix point signal processing library
+ * (SPL) function descriptions and declarations. For specific function calls,
+ * see bottom of file.
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SIGNAL_PROCESSING_LIBRARY_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SIGNAL_PROCESSING_LIBRARY_H_
+
+#include <string.h>
+
+#include "common_audio/signal_processing/dot_product_with_scale.h"
+
+// Macros specific for the fixed point implementation
+#define WEBRTC_SPL_WORD16_MAX 32767
+#define WEBRTC_SPL_WORD16_MIN -32768
+#define WEBRTC_SPL_WORD32_MAX (int32_t)0x7fffffff
+#define WEBRTC_SPL_WORD32_MIN (int32_t)0x80000000
+#define WEBRTC_SPL_MAX_LPC_ORDER 14
+#define WEBRTC_SPL_MIN(A, B) (A < B ? A : B)  // Get min value
+#define WEBRTC_SPL_MAX(A, B) (A > B ? A : B)  // Get max value
+// TODO(kma/bjorn): For the next two macros, investigate how to correct the code
+// for inputs of a = WEBRTC_SPL_WORD16_MIN or WEBRTC_SPL_WORD32_MIN.
+#define WEBRTC_SPL_ABS_W16(a) (((int16_t)a >= 0) ? ((int16_t)a) : -((int16_t)a))
+#define WEBRTC_SPL_ABS_W32(a) (((int32_t)a >= 0) ? ((int32_t)a) : -((int32_t)a))
+
+#define WEBRTC_SPL_MUL(a, b) ((int32_t)((int32_t)(a) * (int32_t)(b)))
+#define WEBRTC_SPL_UMUL(a, b) ((uint32_t)((uint32_t)(a) * (uint32_t)(b)))
+#define WEBRTC_SPL_UMUL_32_16(a, b) ((uint32_t)((uint32_t)(a) * (uint16_t)(b)))
+#define WEBRTC_SPL_MUL_16_U16(a, b) ((int32_t)(int16_t)(a) * (uint16_t)(b))
+
+// clang-format off
+// clang-format would choose some identation
+// leading to presubmit error (cpplint.py)
+#ifndef WEBRTC_ARCH_ARM_V7
+// For ARMv7 platforms, these are inline functions in spl_inl_armv7.h
+#ifndef MIPS32_LE
+// For MIPS platforms, these are inline functions in spl_inl_mips.h
+#define WEBRTC_SPL_MUL_16_16(a, b) ((int32_t)(((int16_t)(a)) * ((int16_t)(b))))
+#define WEBRTC_SPL_MUL_16_32_RSFT16(a, b) \
+        (WEBRTC_SPL_MUL_16_16(a, b >> 16) +     \
+        ((WEBRTC_SPL_MUL_16_16(a, (b & 0xffff) >> 1) + 0x4000) >> 15))
+#endif
+#endif
+
+#define WEBRTC_SPL_MUL_16_32_RSFT11(a, b)          \
+        (WEBRTC_SPL_MUL_16_16(a, (b) >> 16) * (1 << 5) + \
+        (((WEBRTC_SPL_MUL_16_U16(a, (uint16_t)(b)) >> 1) + 0x0200) >> 10))
+#define WEBRTC_SPL_MUL_16_32_RSFT14(a, b)          \
+        (WEBRTC_SPL_MUL_16_16(a, (b) >> 16) * (1 << 2) + \
+        (((WEBRTC_SPL_MUL_16_U16(a, (uint16_t)(b)) >> 1) + 0x1000) >> 13))
+#define WEBRTC_SPL_MUL_16_32_RSFT15(a, b)            \
+        ((WEBRTC_SPL_MUL_16_16(a, (b) >> 16) * (1 << 1)) + \
+        (((WEBRTC_SPL_MUL_16_U16(a, (uint16_t)(b)) >> 1) + 0x2000) >> 14))
+// clang-format on
+
+#define WEBRTC_SPL_MUL_16_16_RSFT(a, b, c) (WEBRTC_SPL_MUL_16_16(a, b) >> (c))
+
+#define WEBRTC_SPL_MUL_16_16_RSFT_WITH_ROUND(a, b, c) \
+  ((WEBRTC_SPL_MUL_16_16(a, b) + ((int32_t)(((int32_t)1) << ((c)-1)))) >> (c))
+
+// C + the 32 most significant bits of A * B
+#define WEBRTC_SPL_SCALEDIFF32(A, B, C) \
+  (C + (B >> 16) * A + (((uint32_t)(B & 0x0000FFFF) * A) >> 16))
+
+#define WEBRTC_SPL_SAT(a, b, c) (b > a ? a : b < c ? c : b)
+
+// Shifting with negative numbers allowed
+// Positive means left shift
+#define WEBRTC_SPL_SHIFT_W32(x, c) ((c) >= 0 ? (x) * (1 << (c)) : (x) >> -(c))
+
+// Shifting with negative numbers not allowed
+// We cannot do casting here due to signed/unsigned problem
+#define WEBRTC_SPL_LSHIFT_W32(x, c) ((x) << (c))
+
+#define WEBRTC_SPL_RSHIFT_U32(x, c) ((uint32_t)(x) >> (c))
+
+#define WEBRTC_SPL_RAND(a) ((int16_t)((((int16_t)a * 18816) >> 7) & 0x00007fff))
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define WEBRTC_SPL_MEMCPY_W16(v1, v2, length) \
+  memcpy(v1, v2, (length) * sizeof(int16_t))
+
+// inline functions:
+#include "common_audio/signal_processing/include/spl_inl.h"
+
+// third party math functions
+#include "common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.h"
+
+int16_t WebRtcSpl_GetScalingSquare(int16_t* in_vector,
+                                   size_t in_vector_length,
+                                   size_t times);
+
+// Copy and set operations. Implementation in copy_set_operations.c.
+// Descriptions at bottom of file.
+void WebRtcSpl_MemSetW16(int16_t* vector,
+                         int16_t set_value,
+                         size_t vector_length);
+void WebRtcSpl_MemSetW32(int32_t* vector,
+                         int32_t set_value,
+                         size_t vector_length);
+void WebRtcSpl_MemCpyReversedOrder(int16_t* out_vector,
+                                   int16_t* in_vector,
+                                   size_t vector_length);
+void WebRtcSpl_CopyFromEndW16(const int16_t* in_vector,
+                              size_t in_vector_length,
+                              size_t samples,
+                              int16_t* out_vector);
+void WebRtcSpl_ZerosArrayW16(int16_t* vector, size_t vector_length);
+void WebRtcSpl_ZerosArrayW32(int32_t* vector, size_t vector_length);
+// End: Copy and set operations.
+
+// Minimum and maximum operation functions and their pointers.
+// Implementation in min_max_operations.c.
+
+// Returns the largest absolute value in a signed 16-bit vector.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Maximum absolute value in vector.
+typedef int16_t (*MaxAbsValueW16)(const int16_t* vector, size_t length);
+extern const MaxAbsValueW16 WebRtcSpl_MaxAbsValueW16;
+int16_t WebRtcSpl_MaxAbsValueW16C(const int16_t* vector, size_t length);
+#if defined(WEBRTC_HAS_NEON)
+int16_t WebRtcSpl_MaxAbsValueW16Neon(const int16_t* vector, size_t length);
+#endif
+#if defined(MIPS32_LE)
+int16_t WebRtcSpl_MaxAbsValueW16_mips(const int16_t* vector, size_t length);
+#endif
+
+// Returns the largest absolute value in a signed 32-bit vector.
+//
+// Input:
+//      - vector : 32-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Maximum absolute value in vector.
+typedef int32_t (*MaxAbsValueW32)(const int32_t* vector, size_t length);
+extern const MaxAbsValueW32 WebRtcSpl_MaxAbsValueW32;
+int32_t WebRtcSpl_MaxAbsValueW32C(const int32_t* vector, size_t length);
+#if defined(WEBRTC_HAS_NEON)
+int32_t WebRtcSpl_MaxAbsValueW32Neon(const int32_t* vector, size_t length);
+#endif
+#if defined(MIPS_DSP_R1_LE)
+int32_t WebRtcSpl_MaxAbsValueW32_mips(const int32_t* vector, size_t length);
+#endif
+
+// Returns the maximum value of a 16-bit vector.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Maximum sample value in `vector`.
+typedef int16_t (*MaxValueW16)(const int16_t* vector, size_t length);
+extern const MaxValueW16 WebRtcSpl_MaxValueW16;
+int16_t WebRtcSpl_MaxValueW16C(const int16_t* vector, size_t length);
+#if defined(WEBRTC_HAS_NEON)
+int16_t WebRtcSpl_MaxValueW16Neon(const int16_t* vector, size_t length);
+#endif
+#if defined(MIPS32_LE)
+int16_t WebRtcSpl_MaxValueW16_mips(const int16_t* vector, size_t length);
+#endif
+
+// Returns the maximum value of a 32-bit vector.
+//
+// Input:
+//      - vector : 32-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Maximum sample value in `vector`.
+typedef int32_t (*MaxValueW32)(const int32_t* vector, size_t length);
+extern const MaxValueW32 WebRtcSpl_MaxValueW32;
+int32_t WebRtcSpl_MaxValueW32C(const int32_t* vector, size_t length);
+#if defined(WEBRTC_HAS_NEON)
+int32_t WebRtcSpl_MaxValueW32Neon(const int32_t* vector, size_t length);
+#endif
+#if defined(MIPS32_LE)
+int32_t WebRtcSpl_MaxValueW32_mips(const int32_t* vector, size_t length);
+#endif
+
+// Returns the minimum value of a 16-bit vector.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Minimum sample value in `vector`.
+typedef int16_t (*MinValueW16)(const int16_t* vector, size_t length);
+extern const MinValueW16 WebRtcSpl_MinValueW16;
+int16_t WebRtcSpl_MinValueW16C(const int16_t* vector, size_t length);
+#if defined(WEBRTC_HAS_NEON)
+int16_t WebRtcSpl_MinValueW16Neon(const int16_t* vector, size_t length);
+#endif
+#if defined(MIPS32_LE)
+int16_t WebRtcSpl_MinValueW16_mips(const int16_t* vector, size_t length);
+#endif
+
+// Returns the minimum value of a 32-bit vector.
+//
+// Input:
+//      - vector : 32-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Minimum sample value in `vector`.
+typedef int32_t (*MinValueW32)(const int32_t* vector, size_t length);
+extern const MinValueW32 WebRtcSpl_MinValueW32;
+int32_t WebRtcSpl_MinValueW32C(const int32_t* vector, size_t length);
+#if defined(WEBRTC_HAS_NEON)
+int32_t WebRtcSpl_MinValueW32Neon(const int32_t* vector, size_t length);
+#endif
+#if defined(MIPS32_LE)
+int32_t WebRtcSpl_MinValueW32_mips(const int32_t* vector, size_t length);
+#endif
+
+// Returns both the minimum and maximum values of a 16-bit vector.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+// Ouput:
+//      - max_val : Maximum sample value in `vector`.
+//      - min_val : Minimum sample value in `vector`.
+void WebRtcSpl_MinMaxW16(const int16_t* vector,
+                         size_t length,
+                         int16_t* min_val,
+                         int16_t* max_val);
+#if defined(WEBRTC_HAS_NEON)
+void WebRtcSpl_MinMaxW16Neon(const int16_t* vector,
+                             size_t length,
+                             int16_t* min_val,
+                             int16_t* max_val);
+#endif
+
+// Returns the vector index to the largest absolute value of a 16-bit vector.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Index to the maximum absolute value in vector.
+//                 If there are multiple equal maxima, return the index of the
+//                 first. -32768 will always have precedence over 32767 (despite
+//                 -32768 presenting an int16 absolute value of 32767).
+size_t WebRtcSpl_MaxAbsIndexW16(const int16_t* vector, size_t length);
+
+// Returns the element with the largest absolute value of a 16-bit vector. Note
+// that this function can return a negative value.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : The element with the largest absolute value. Note that this
+//                 may be a negative value.
+int16_t WebRtcSpl_MaxAbsElementW16(const int16_t* vector, size_t length);
+
+// Returns the vector index to the maximum sample value of a 16-bit vector.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Index to the maximum value in vector (if multiple
+//                 indexes have the maximum, return the first).
+size_t WebRtcSpl_MaxIndexW16(const int16_t* vector, size_t length);
+
+// Returns the vector index to the maximum sample value of a 32-bit vector.
+//
+// Input:
+//      - vector : 32-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Index to the maximum value in vector (if multiple
+//                 indexes have the maximum, return the first).
+size_t WebRtcSpl_MaxIndexW32(const int32_t* vector, size_t length);
+
+// Returns the vector index to the minimum sample value of a 16-bit vector.
+//
+// Input:
+//      - vector : 16-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Index to the mimimum value in vector  (if multiple
+//                 indexes have the minimum, return the first).
+size_t WebRtcSpl_MinIndexW16(const int16_t* vector, size_t length);
+
+// Returns the vector index to the minimum sample value of a 32-bit vector.
+//
+// Input:
+//      - vector : 32-bit input vector.
+//      - length : Number of samples in vector.
+//
+// Return value  : Index to the mimimum value in vector  (if multiple
+//                 indexes have the minimum, return the first).
+size_t WebRtcSpl_MinIndexW32(const int32_t* vector, size_t length);
+
+// End: Minimum and maximum operations.
+
+// Vector scaling operations. Implementation in vector_scaling_operations.c.
+// Description at bottom of file.
+void WebRtcSpl_VectorBitShiftW16(int16_t* out_vector,
+                                 size_t vector_length,
+                                 const int16_t* in_vector,
+                                 int16_t right_shifts);
+void WebRtcSpl_VectorBitShiftW32(int32_t* out_vector,
+                                 size_t vector_length,
+                                 const int32_t* in_vector,
+                                 int16_t right_shifts);
+void WebRtcSpl_VectorBitShiftW32ToW16(int16_t* out_vector,
+                                      size_t vector_length,
+                                      const int32_t* in_vector,
+                                      int right_shifts);
+void WebRtcSpl_ScaleVector(const int16_t* in_vector,
+                           int16_t* out_vector,
+                           int16_t gain,
+                           size_t vector_length,
+                           int16_t right_shifts);
+void WebRtcSpl_ScaleVectorWithSat(const int16_t* in_vector,
+                                  int16_t* out_vector,
+                                  int16_t gain,
+                                  size_t vector_length,
+                                  int16_t right_shifts);
+void WebRtcSpl_ScaleAndAddVectors(const int16_t* in_vector1,
+                                  int16_t gain1,
+                                  int right_shifts1,
+                                  const int16_t* in_vector2,
+                                  int16_t gain2,
+                                  int right_shifts2,
+                                  int16_t* out_vector,
+                                  size_t vector_length);
+
+// The functions (with related pointer) perform the vector operation:
+//   out_vector[k] = ((scale1 * in_vector1[k]) + (scale2 * in_vector2[k])
+//        + round_value) >> right_shifts,
+//   where  round_value = (1 << right_shifts) >> 1.
+//
+// Input:
+//      - in_vector1       : Input vector 1
+//      - in_vector1_scale : Gain to be used for vector 1
+//      - in_vector2       : Input vector 2
+//      - in_vector2_scale : Gain to be used for vector 2
+//      - right_shifts     : Number of right bit shifts to be applied
+//      - length           : Number of elements in the input vectors
+//
+// Output:
+//      - out_vector       : Output vector
+// Return value            : 0 if OK, -1 if (in_vector1 == null
+//                           || in_vector2 == null || out_vector == null
+//                           || length <= 0 || right_shift < 0).
+typedef int (*ScaleAndAddVectorsWithRound)(const int16_t* in_vector1,
+                                           int16_t in_vector1_scale,
+                                           const int16_t* in_vector2,
+                                           int16_t in_vector2_scale,
+                                           int right_shifts,
+                                           int16_t* out_vector,
+                                           size_t length);
+extern const ScaleAndAddVectorsWithRound WebRtcSpl_ScaleAndAddVectorsWithRound;
+int WebRtcSpl_ScaleAndAddVectorsWithRoundC(const int16_t* in_vector1,
+                                           int16_t in_vector1_scale,
+                                           const int16_t* in_vector2,
+                                           int16_t in_vector2_scale,
+                                           int right_shifts,
+                                           int16_t* out_vector,
+                                           size_t length);
+#if defined(MIPS_DSP_R1_LE)
+int WebRtcSpl_ScaleAndAddVectorsWithRound_mips(const int16_t* in_vector1,
+                                               int16_t in_vector1_scale,
+                                               const int16_t* in_vector2,
+                                               int16_t in_vector2_scale,
+                                               int right_shifts,
+                                               int16_t* out_vector,
+                                               size_t length);
+#endif
+// End: Vector scaling operations.
+
+// iLBC specific functions. Implementations in ilbc_specific_functions.c.
+// Description at bottom of file.
+void WebRtcSpl_ReverseOrderMultArrayElements(int16_t* out_vector,
+                                             const int16_t* in_vector,
+                                             const int16_t* window,
+                                             size_t vector_length,
+                                             int16_t right_shifts);
+void WebRtcSpl_ElementwiseVectorMult(int16_t* out_vector,
+                                     const int16_t* in_vector,
+                                     const int16_t* window,
+                                     size_t vector_length,
+                                     int16_t right_shifts);
+void WebRtcSpl_AddVectorsAndShift(int16_t* out_vector,
+                                  const int16_t* in_vector1,
+                                  const int16_t* in_vector2,
+                                  size_t vector_length,
+                                  int16_t right_shifts);
+void WebRtcSpl_AddAffineVectorToVector(int16_t* out_vector,
+                                       const int16_t* in_vector,
+                                       int16_t gain,
+                                       int32_t add_constant,
+                                       int16_t right_shifts,
+                                       size_t vector_length);
+void WebRtcSpl_AffineTransformVector(int16_t* out_vector,
+                                     const int16_t* in_vector,
+                                     int16_t gain,
+                                     int32_t add_constant,
+                                     int16_t right_shifts,
+                                     size_t vector_length);
+// End: iLBC specific functions.
+
+// Signal processing operations.
+
+// A 32-bit fix-point implementation of auto-correlation computation
+//
+// Input:
+//      - in_vector        : Vector to calculate autocorrelation upon
+//      - in_vector_length : Length (in samples) of `vector`
+//      - order            : The order up to which the autocorrelation should be
+//                           calculated
+//
+// Output:
+//      - result           : auto-correlation values (values should be seen
+//                           relative to each other since the absolute values
+//                           might have been down shifted to avoid overflow)
+//
+//      - scale            : The number of left shifts required to obtain the
+//                           auto-correlation in Q0
+//
+// Return value            : Number of samples in `result`, i.e. (order+1)
+size_t WebRtcSpl_AutoCorrelation(const int16_t* in_vector,
+                                 size_t in_vector_length,
+                                 size_t order,
+                                 int32_t* result,
+                                 int* scale);
+
+// A 32-bit fix-point implementation of the Levinson-Durbin algorithm that
+// does NOT use the 64 bit class
+//
+// Input:
+//      - auto_corr : Vector with autocorrelation values of length >= `order`+1
+//      - order     : The LPC filter order (support up to order 20)
+//
+// Output:
+//      - lpc_coef  : lpc_coef[0..order] LPC coefficients in Q12
+//      - refl_coef : refl_coef[0...order-1]| Reflection coefficients in Q15
+//
+// Return value     : 1 for stable 0 for unstable
+int16_t WebRtcSpl_LevinsonDurbin(const int32_t* auto_corr,
+                                 int16_t* lpc_coef,
+                                 int16_t* refl_coef,
+                                 size_t order);
+
+// Converts reflection coefficients `refl_coef` to LPC coefficients `lpc_coef`.
+// This version is a 16 bit operation.
+//
+// NOTE: The 16 bit refl_coef -> lpc_coef conversion might result in a
+// "slightly unstable" filter (i.e., a pole just outside the unit circle) in
+// "rare" cases even if the reflection coefficients are stable.
+//
+// Input:
+//      - refl_coef : Reflection coefficients in Q15 that should be converted
+//                    to LPC coefficients
+//      - use_order : Number of coefficients in `refl_coef`
+//
+// Output:
+//      - lpc_coef  : LPC coefficients in Q12
+void WebRtcSpl_ReflCoefToLpc(const int16_t* refl_coef,
+                             int use_order,
+                             int16_t* lpc_coef);
+
+// Converts LPC coefficients `lpc_coef` to reflection coefficients `refl_coef`.
+// This version is a 16 bit operation.
+// The conversion is implemented by the step-down algorithm.
+//
+// Input:
+//      - lpc_coef  : LPC coefficients in Q12, that should be converted to
+//                    reflection coefficients
+//      - use_order : Number of coefficients in `lpc_coef`
+//
+// Output:
+//      - refl_coef : Reflection coefficients in Q15.
+void WebRtcSpl_LpcToReflCoef(int16_t* lpc_coef,
+                             int use_order,
+                             int16_t* refl_coef);
+
+// Calculates reflection coefficients (16 bit) from auto-correlation values
+//
+// Input:
+//      - auto_corr : Auto-correlation values
+//      - use_order : Number of coefficients wanted be calculated
+//
+// Output:
+//      - refl_coef : Reflection coefficients in Q15.
+void WebRtcSpl_AutoCorrToReflCoef(const int32_t* auto_corr,
+                                  int use_order,
+                                  int16_t* refl_coef);
+
+// The functions (with related pointer) calculate the cross-correlation between
+// two sequences `seq1` and `seq2`.
+// `seq1` is fixed and `seq2` slides as the pointer is increased with the
+// amount `step_seq2`. Note the arguments should obey the relationship:
+// `dim_seq` - 1 + `step_seq2` * (`dim_cross_correlation` - 1) <
+//      buffer size of `seq2`
+//
+// Input:
+//      - seq1           : First sequence (fixed throughout the correlation)
+//      - seq2           : Second sequence (slides `step_vector2` for each
+//                            new correlation)
+//      - dim_seq        : Number of samples to use in the cross-correlation
+//      - dim_cross_correlation : Number of cross-correlations to calculate (the
+//                            start position for `vector2` is updated for each
+//                            new one)
+//      - right_shifts   : Number of right bit shifts to use. This will
+//                            become the output Q-domain.
+//      - step_seq2      : How many (positive or negative) steps the
+//                            `vector2` pointer should be updated for each new
+//                            cross-correlation value.
+//
+// Output:
+//      - cross_correlation : The cross-correlation in Q(-right_shifts)
+typedef void (*CrossCorrelation)(int32_t* cross_correlation,
+                                 const int16_t* seq1,
+                                 const int16_t* seq2,
+                                 size_t dim_seq,
+                                 size_t dim_cross_correlation,
+                                 int right_shifts,
+                                 int step_seq2);
+extern const CrossCorrelation WebRtcSpl_CrossCorrelation;
+void WebRtcSpl_CrossCorrelationC(int32_t* cross_correlation,
+                                 const int16_t* seq1,
+                                 const int16_t* seq2,
+                                 size_t dim_seq,
+                                 size_t dim_cross_correlation,
+                                 int right_shifts,
+                                 int step_seq2);
+#if defined(WEBRTC_HAS_NEON)
+void WebRtcSpl_CrossCorrelationNeon(int32_t* cross_correlation,
+                                    const int16_t* seq1,
+                                    const int16_t* seq2,
+                                    size_t dim_seq,
+                                    size_t dim_cross_correlation,
+                                    int right_shifts,
+                                    int step_seq2);
+#endif
+#if defined(MIPS32_LE)
+void WebRtcSpl_CrossCorrelation_mips(int32_t* cross_correlation,
+                                     const int16_t* seq1,
+                                     const int16_t* seq2,
+                                     size_t dim_seq,
+                                     size_t dim_cross_correlation,
+                                     int right_shifts,
+                                     int step_seq2);
+#endif
+
+// Creates (the first half of) a Hanning window. Size must be at least 1 and
+// at most 512.
+//
+// Input:
+//      - size      : Length of the requested Hanning window (1 to 512)
+//
+// Output:
+//      - window    : Hanning vector in Q14.
+void WebRtcSpl_GetHanningWindow(int16_t* window, size_t size);
+
+// Calculates y[k] = sqrt(1 - x[k]^2) for each element of the input vector
+// `in_vector`. Input and output values are in Q15.
+//
+// Inputs:
+//      - in_vector     : Values to calculate sqrt(1 - x^2) of
+//      - vector_length : Length of vector `in_vector`
+//
+// Output:
+//      - out_vector    : Output values in Q15
+void WebRtcSpl_SqrtOfOneMinusXSquared(int16_t* in_vector,
+                                      size_t vector_length,
+                                      int16_t* out_vector);
+// End: Signal processing operations.
+
+// Randomization functions. Implementations collected in
+// randomization_functions.c and descriptions at bottom of this file.
+int16_t WebRtcSpl_RandU(uint32_t* seed);
+int16_t WebRtcSpl_RandN(uint32_t* seed);
+int16_t WebRtcSpl_RandUArray(int16_t* vector,
+                             int16_t vector_length,
+                             uint32_t* seed);
+// End: Randomization functions.
+
+// Math functions
+int32_t WebRtcSpl_Sqrt(int32_t value);
+
+// Divisions. Implementations collected in division_operations.c and
+// descriptions at bottom of this file.
+uint32_t WebRtcSpl_DivU32U16(uint32_t num, uint16_t den);
+int32_t WebRtcSpl_DivW32W16(int32_t num, int16_t den);
+int16_t WebRtcSpl_DivW32W16ResW16(int32_t num, int16_t den);
+int32_t WebRtcSpl_DivResultInQ31(int32_t num, int32_t den);
+int32_t WebRtcSpl_DivW32HiLow(int32_t num, int16_t den_hi, int16_t den_low);
+// End: Divisions.
+
+int32_t WebRtcSpl_Energy(int16_t* vector,
+                         size_t vector_length,
+                         int* scale_factor);
+
+// Filter operations.
+size_t WebRtcSpl_FilterAR(const int16_t* ar_coef,
+                          size_t ar_coef_length,
+                          const int16_t* in_vector,
+                          size_t in_vector_length,
+                          int16_t* filter_state,
+                          size_t filter_state_length,
+                          int16_t* filter_state_low,
+                          size_t filter_state_low_length,
+                          int16_t* out_vector,
+                          int16_t* out_vector_low,
+                          size_t out_vector_low_length);
+
+// WebRtcSpl_FilterMAFastQ12(...)
+//
+// Performs a MA filtering on a vector in Q12
+//
+// Input:
+//      - in_vector         : Input samples (state in positions
+//                            in_vector[-order] .. in_vector[-1])
+//      - ma_coef           : Filter coefficients (in Q12)
+//      - ma_coef_length    : Number of B coefficients (order+1)
+//      - vector_length     : Number of samples to be filtered
+//
+// Output:
+//      - out_vector        : Filtered samples
+//
+void WebRtcSpl_FilterMAFastQ12(const int16_t* in_vector,
+                               int16_t* out_vector,
+                               const int16_t* ma_coef,
+                               size_t ma_coef_length,
+                               size_t vector_length);
+
+// Performs a AR filtering on a vector in Q12
+// Input:
+//      - data_in            : Input samples
+//      - data_out           : State information in positions
+//                               data_out[-order] .. data_out[-1]
+//      - coefficients       : Filter coefficients (in Q12)
+//      - coefficients_length: Number of coefficients (order+1)
+//      - data_length        : Number of samples to be filtered
+// Output:
+//      - data_out           : Filtered samples
+void WebRtcSpl_FilterARFastQ12(const int16_t* data_in,
+                               int16_t* data_out,
+                               const int16_t* __restrict coefficients,
+                               size_t coefficients_length,
+                               size_t data_length);
+
+// The functions (with related pointer) perform a MA down sampling filter
+// on a vector.
+// Input:
+//      - data_in            : Input samples (state in positions
+//                               data_in[-order] .. data_in[-1])
+//      - data_in_length     : Number of samples in `data_in` to be filtered.
+//                               This must be at least
+//                               `delay` + `factor`*(`out_vector_length`-1) + 1)
+//      - data_out_length    : Number of down sampled samples desired
+//      - coefficients       : Filter coefficients (in Q12)
+//      - coefficients_length: Number of coefficients (order+1)
+//      - factor             : Decimation factor
+//      - delay              : Delay of filter (compensated for in out_vector)
+// Output:
+//      - data_out           : Filtered samples
+// Return value              : 0 if OK, -1 if `in_vector` is too short
+typedef int (*DownsampleFast)(const int16_t* data_in,
+                              size_t data_in_length,
+                              int16_t* data_out,
+                              size_t data_out_length,
+                              const int16_t* __restrict coefficients,
+                              size_t coefficients_length,
+                              int factor,
+                              size_t delay);
+extern const DownsampleFast WebRtcSpl_DownsampleFast;
+int WebRtcSpl_DownsampleFastC(const int16_t* data_in,
+                              size_t data_in_length,
+                              int16_t* data_out,
+                              size_t data_out_length,
+                              const int16_t* __restrict coefficients,
+                              size_t coefficients_length,
+                              int factor,
+                              size_t delay);
+#if defined(WEBRTC_HAS_NEON)
+int WebRtcSpl_DownsampleFastNeon(const int16_t* data_in,
+                                 size_t data_in_length,
+                                 int16_t* data_out,
+                                 size_t data_out_length,
+                                 const int16_t* __restrict coefficients,
+                                 size_t coefficients_length,
+                                 int factor,
+                                 size_t delay);
+#endif
+#if defined(MIPS32_LE)
+int WebRtcSpl_DownsampleFast_mips(const int16_t* data_in,
+                                  size_t data_in_length,
+                                  int16_t* data_out,
+                                  size_t data_out_length,
+                                  const int16_t* __restrict coefficients,
+                                  size_t coefficients_length,
+                                  int factor,
+                                  size_t delay);
+#endif
+
+// End: Filter operations.
+
+// FFT operations
+
+int WebRtcSpl_ComplexFFT(int16_t vector[], int stages, int mode);
+int WebRtcSpl_ComplexIFFT(int16_t vector[], int stages, int mode);
+
+// Treat a 16-bit complex data buffer `complex_data` as an array of 32-bit
+// values, and swap elements whose indexes are bit-reverses of each other.
+//
+// Input:
+//      - complex_data  : Complex data buffer containing 2^`stages` real
+//                        elements interleaved with 2^`stages` imaginary
+//                        elements: [Re Im Re Im Re Im....]
+//      - stages        : Number of FFT stages. Must be at least 3 and at most
+//                        10, since the table WebRtcSpl_kSinTable1024[] is 1024
+//                        elements long.
+//
+// Output:
+//      - complex_data  : The complex data buffer.
+
+void WebRtcSpl_ComplexBitReverse(int16_t* __restrict complex_data, int stages);
+
+// End: FFT operations
+
+/************************************************************
+ *
+ * RESAMPLING FUNCTIONS AND THEIR STRUCTS ARE DEFINED BELOW
+ *
+ ************************************************************/
+
+/*******************************************************************
+ * resample.c
+ *
+ * Includes the following resampling combinations
+ * 22 kHz -> 16 kHz
+ * 16 kHz -> 22 kHz
+ * 22 kHz ->  8 kHz
+ *  8 kHz -> 22 kHz
+ *
+ ******************************************************************/
+
+// state structure for 22 -> 16 resampler
+typedef struct {
+  int32_t S_22_44[8];
+  int32_t S_44_32[8];
+  int32_t S_32_16[8];
+} WebRtcSpl_State22khzTo16khz;
+
+void WebRtcSpl_Resample22khzTo16khz(const int16_t* in,
+                                    int16_t* out,
+                                    WebRtcSpl_State22khzTo16khz* state,
+                                    int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample22khzTo16khz(WebRtcSpl_State22khzTo16khz* state);
+
+// state structure for 16 -> 22 resampler
+typedef struct {
+  int32_t S_16_32[8];
+  int32_t S_32_22[8];
+} WebRtcSpl_State16khzTo22khz;
+
+void WebRtcSpl_Resample16khzTo22khz(const int16_t* in,
+                                    int16_t* out,
+                                    WebRtcSpl_State16khzTo22khz* state,
+                                    int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample16khzTo22khz(WebRtcSpl_State16khzTo22khz* state);
+
+// state structure for 22 -> 8 resampler
+typedef struct {
+  int32_t S_22_22[16];
+  int32_t S_22_16[8];
+  int32_t S_16_8[8];
+} WebRtcSpl_State22khzTo8khz;
+
+void WebRtcSpl_Resample22khzTo8khz(const int16_t* in,
+                                   int16_t* out,
+                                   WebRtcSpl_State22khzTo8khz* state,
+                                   int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample22khzTo8khz(WebRtcSpl_State22khzTo8khz* state);
+
+// state structure for 8 -> 22 resampler
+typedef struct {
+  int32_t S_8_16[8];
+  int32_t S_16_11[8];
+  int32_t S_11_22[8];
+} WebRtcSpl_State8khzTo22khz;
+
+void WebRtcSpl_Resample8khzTo22khz(const int16_t* in,
+                                   int16_t* out,
+                                   WebRtcSpl_State8khzTo22khz* state,
+                                   int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample8khzTo22khz(WebRtcSpl_State8khzTo22khz* state);
+
+/*******************************************************************
+ * resample_fractional.c
+ * Functions for internal use in the other resample functions
+ *
+ * Includes the following resampling combinations
+ * 48 kHz -> 32 kHz
+ * 32 kHz -> 24 kHz
+ * 44 kHz -> 32 kHz
+ *
+ ******************************************************************/
+
+void WebRtcSpl_Resample48khzTo32khz(const int32_t* In, int32_t* Out, size_t K);
+
+void WebRtcSpl_Resample32khzTo24khz(const int32_t* In, int32_t* Out, size_t K);
+
+void WebRtcSpl_Resample44khzTo32khz(const int32_t* In, int32_t* Out, size_t K);
+
+/*******************************************************************
+ * resample_48khz.c
+ *
+ * Includes the following resampling combinations
+ * 48 kHz -> 16 kHz
+ * 16 kHz -> 48 kHz
+ * 48 kHz ->  8 kHz
+ *  8 kHz -> 48 kHz
+ *
+ ******************************************************************/
+
+typedef struct {
+  int32_t S_48_48[16];
+  int32_t S_48_32[8];
+  int32_t S_32_16[8];
+} WebRtcSpl_State48khzTo16khz;
+
+void WebRtcSpl_Resample48khzTo16khz(const int16_t* in,
+                                    int16_t* out,
+                                    WebRtcSpl_State48khzTo16khz* state,
+                                    int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz* state);
+
+typedef struct {
+  int32_t S_16_32[8];
+  int32_t S_32_24[8];
+  int32_t S_24_48[8];
+} WebRtcSpl_State16khzTo48khz;
+
+void WebRtcSpl_Resample16khzTo48khz(const int16_t* in,
+                                    int16_t* out,
+                                    WebRtcSpl_State16khzTo48khz* state,
+                                    int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz* state);
+
+typedef struct {
+  int32_t S_48_24[8];
+  int32_t S_24_24[16];
+  int32_t S_24_16[8];
+  int32_t S_16_8[8];
+} WebRtcSpl_State48khzTo8khz;
+
+void WebRtcSpl_Resample48khzTo8khz(const int16_t* in,
+                                   int16_t* out,
+                                   WebRtcSpl_State48khzTo8khz* state,
+                                   int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz* state);
+
+typedef struct {
+  int32_t S_8_16[8];
+  int32_t S_16_12[8];
+  int32_t S_12_24[8];
+  int32_t S_24_48[8];
+} WebRtcSpl_State8khzTo48khz;
+
+void WebRtcSpl_Resample8khzTo48khz(const int16_t* in,
+                                   int16_t* out,
+                                   WebRtcSpl_State8khzTo48khz* state,
+                                   int32_t* tmpmem);
+
+void WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz* state);
+
+/*******************************************************************
+ * resample_by_2.c
+ *
+ * Includes down and up sampling by a factor of two.
+ *
+ ******************************************************************/
+
+void WebRtcSpl_DownsampleBy2(const int16_t* in,
+                             size_t len,
+                             int16_t* out,
+                             int32_t* filtState);
+
+void WebRtcSpl_UpsampleBy2(const int16_t* in,
+                           size_t len,
+                           int16_t* out,
+                           int32_t* filtState);
+
+/************************************************************
+ * END OF RESAMPLING FUNCTIONS
+ ************************************************************/
+void WebRtcSpl_AnalysisQMF(const int16_t* in_data,
+                           size_t in_data_length,
+                           int16_t* low_band,
+                           int16_t* high_band,
+                           int32_t* filter_state1,
+                           int32_t* filter_state2);
+void WebRtcSpl_SynthesisQMF(const int16_t* low_band,
+                            const int16_t* high_band,
+                            size_t band_length,
+                            int16_t* out_data,
+                            int32_t* filter_state1,
+                            int32_t* filter_state2);
+
+#ifdef __cplusplus
+}
+#endif  // __cplusplus
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SIGNAL_PROCESSING_LIBRARY_H_
+
+//
+// WebRtcSpl_AddSatW16(...)
+// WebRtcSpl_AddSatW32(...)
+//
+// Returns the result of a saturated 16-bit, respectively 32-bit, addition of
+// the numbers specified by the `var1` and `var2` parameters.
+//
+// Input:
+//      - var1      : Input variable 1
+//      - var2      : Input variable 2
+//
+// Return value     : Added and saturated value
+//
+
+//
+// WebRtcSpl_SubSatW16(...)
+// WebRtcSpl_SubSatW32(...)
+//
+// Returns the result of a saturated 16-bit, respectively 32-bit, subtraction
+// of the numbers specified by the `var1` and `var2` parameters.
+//
+// Input:
+//      - var1      : Input variable 1
+//      - var2      : Input variable 2
+//
+// Returned value   : Subtracted and saturated value
+//
+
+//
+// WebRtcSpl_GetSizeInBits(...)
+//
+// Returns the # of bits that are needed at the most to represent the number
+// specified by the `value` parameter.
+//
+// Input:
+//      - value     : Input value
+//
+// Return value     : Number of bits needed to represent `value`
+//
+
+//
+// WebRtcSpl_NormW32(...)
+//
+// Norm returns the # of left shifts required to 32-bit normalize the 32-bit
+// signed number specified by the `value` parameter.
+//
+// Input:
+//      - value     : Input value
+//
+// Return value     : Number of bit shifts needed to 32-bit normalize `value`
+//
+
+//
+// WebRtcSpl_NormW16(...)
+//
+// Norm returns the # of left shifts required to 16-bit normalize the 16-bit
+// signed number specified by the `value` parameter.
+//
+// Input:
+//      - value     : Input value
+//
+// Return value     : Number of bit shifts needed to 32-bit normalize `value`
+//
+
+//
+// WebRtcSpl_NormU32(...)
+//
+// Norm returns the # of left shifts required to 32-bit normalize the unsigned
+// 32-bit number specified by the `value` parameter.
+//
+// Input:
+//      - value     : Input value
+//
+// Return value     : Number of bit shifts needed to 32-bit normalize `value`
+//
+
+//
+// WebRtcSpl_GetScalingSquare(...)
+//
+// Returns the # of bits required to scale the samples specified in the
+// `in_vector` parameter so that, if the squares of the samples are added the
+// # of times specified by the `times` parameter, the 32-bit addition will not
+// overflow (result in int32_t).
+//
+// Input:
+//      - in_vector         : Input vector to check scaling on
+//      - in_vector_length  : Samples in `in_vector`
+//      - times             : Number of additions to be performed
+//
+// Return value             : Number of right bit shifts needed to avoid
+//                            overflow in the addition calculation
+//
+
+//
+// WebRtcSpl_MemSetW16(...)
+//
+// Sets all the values in the int16_t vector `vector` of length
+// `vector_length` to the specified value `set_value`
+//
+// Input:
+//      - vector        : Pointer to the int16_t vector
+//      - set_value     : Value specified
+//      - vector_length : Length of vector
+//
+
+//
+// WebRtcSpl_MemSetW32(...)
+//
+// Sets all the values in the int32_t vector `vector` of length
+// `vector_length` to the specified value `set_value`
+//
+// Input:
+//      - vector        : Pointer to the int16_t vector
+//      - set_value     : Value specified
+//      - vector_length : Length of vector
+//
+
+//
+// WebRtcSpl_MemCpyReversedOrder(...)
+//
+// Copies all the values from the source int16_t vector `in_vector` to a
+// destination int16_t vector `out_vector`. It is done in reversed order,
+// meaning that the first sample of `in_vector` is copied to the last sample of
+// the `out_vector`. The procedure continues until the last sample of
+// `in_vector` has been copied to the first sample of `out_vector`. This
+// creates a reversed vector. Used in e.g. prediction in iLBC.
+//
+// Input:
+//      - in_vector     : Pointer to the first sample in a int16_t vector
+//                        of length `length`
+//      - vector_length : Number of elements to copy
+//
+// Output:
+//      - out_vector    : Pointer to the last sample in a int16_t vector
+//                        of length `length`
+//
+
+//
+// WebRtcSpl_CopyFromEndW16(...)
+//
+// Copies the rightmost `samples` of `in_vector` (of length `in_vector_length`)
+// to the vector `out_vector`.
+//
+// Input:
+//      - in_vector         : Input vector
+//      - in_vector_length  : Number of samples in `in_vector`
+//      - samples           : Number of samples to extract (from right side)
+//                            from `in_vector`
+//
+// Output:
+//      - out_vector        : Vector with the requested samples
+//
+
+//
+// WebRtcSpl_ZerosArrayW16(...)
+// WebRtcSpl_ZerosArrayW32(...)
+//
+// Inserts the value "zero" in all positions of a w16 and a w32 vector
+// respectively.
+//
+// Input:
+//      - vector_length : Number of samples in vector
+//
+// Output:
+//      - vector        : Vector containing all zeros
+//
+
+//
+// WebRtcSpl_VectorBitShiftW16(...)
+// WebRtcSpl_VectorBitShiftW32(...)
+//
+// Bit shifts all the values in a vector up or downwards. Different calls for
+// int16_t and int32_t vectors respectively.
+//
+// Input:
+//      - vector_length : Length of vector
+//      - in_vector     : Pointer to the vector that should be bit shifted
+//      - right_shifts  : Number of right bit shifts (negative value gives left
+//                        shifts)
+//
+// Output:
+//      - out_vector    : Pointer to the result vector (can be the same as
+//                        `in_vector`)
+//
+
+//
+// WebRtcSpl_VectorBitShiftW32ToW16(...)
+//
+// Bit shifts all the values in a int32_t vector up or downwards and
+// stores the result as an int16_t vector. The function will saturate the
+// signal if needed, before storing in the output vector.
+//
+// Input:
+//      - vector_length : Length of vector
+//      - in_vector     : Pointer to the vector that should be bit shifted
+//      - right_shifts  : Number of right bit shifts (negative value gives left
+//                        shifts)
+//
+// Output:
+//      - out_vector    : Pointer to the result vector (can be the same as
+//                        `in_vector`)
+//
+
+//
+// WebRtcSpl_ScaleVector(...)
+//
+// Performs the vector operation:
+//  out_vector[k] = (gain*in_vector[k])>>right_shifts
+//
+// Input:
+//      - in_vector     : Input vector
+//      - gain          : Scaling gain
+//      - vector_length : Elements in the `in_vector`
+//      - right_shifts  : Number of right bit shifts applied
+//
+// Output:
+//      - out_vector    : Output vector (can be the same as `in_vector`)
+//
+
+//
+// WebRtcSpl_ScaleVectorWithSat(...)
+//
+// Performs the vector operation:
+//  out_vector[k] = SATURATE( (gain*in_vector[k])>>right_shifts )
+//
+// Input:
+//      - in_vector     : Input vector
+//      - gain          : Scaling gain
+//      - vector_length : Elements in the `in_vector`
+//      - right_shifts  : Number of right bit shifts applied
+//
+// Output:
+//      - out_vector    : Output vector (can be the same as `in_vector`)
+//
+
+//
+// WebRtcSpl_ScaleAndAddVectors(...)
+//
+// Performs the vector operation:
+//  out_vector[k] = (gain1*in_vector1[k])>>right_shifts1
+//                  + (gain2*in_vector2[k])>>right_shifts2
+//
+// Input:
+//      - in_vector1    : Input vector 1
+//      - gain1         : Gain to be used for vector 1
+//      - right_shifts1 : Right bit shift to be used for vector 1
+//      - in_vector2    : Input vector 2
+//      - gain2         : Gain to be used for vector 2
+//      - right_shifts2 : Right bit shift to be used for vector 2
+//      - vector_length : Elements in the input vectors
+//
+// Output:
+//      - out_vector    : Output vector
+//
+
+//
+// WebRtcSpl_ReverseOrderMultArrayElements(...)
+//
+// Performs the vector operation:
+//  out_vector[n] = (in_vector[n]*window[-n])>>right_shifts
+//
+// Input:
+//      - in_vector     : Input vector
+//      - window        : Window vector (should be reversed). The pointer
+//                        should be set to the last value in the vector
+//      - right_shifts  : Number of right bit shift to be applied after the
+//                        multiplication
+//      - vector_length : Number of elements in `in_vector`
+//
+// Output:
+//      - out_vector    : Output vector (can be same as `in_vector`)
+//
+
+//
+// WebRtcSpl_ElementwiseVectorMult(...)
+//
+// Performs the vector operation:
+//  out_vector[n] = (in_vector[n]*window[n])>>right_shifts
+//
+// Input:
+//      - in_vector     : Input vector
+//      - window        : Window vector.
+//      - right_shifts  : Number of right bit shift to be applied after the
+//                        multiplication
+//      - vector_length : Number of elements in `in_vector`
+//
+// Output:
+//      - out_vector    : Output vector (can be same as `in_vector`)
+//
+
+//
+// WebRtcSpl_AddVectorsAndShift(...)
+//
+// Performs the vector operation:
+//  out_vector[k] = (in_vector1[k] + in_vector2[k])>>right_shifts
+//
+// Input:
+//      - in_vector1    : Input vector 1
+//      - in_vector2    : Input vector 2
+//      - right_shifts  : Number of right bit shift to be applied after the
+//                        multiplication
+//      - vector_length : Number of elements in `in_vector1` and `in_vector2`
+//
+// Output:
+//      - out_vector    : Output vector (can be same as `in_vector1`)
+//
+
+//
+// WebRtcSpl_AddAffineVectorToVector(...)
+//
+// Adds an affine transformed vector to another vector `out_vector`, i.e,
+// performs
+//  out_vector[k] += (in_vector[k]*gain+add_constant)>>right_shifts
+//
+// Input:
+//      - in_vector     : Input vector
+//      - gain          : Gain value, used to multiply the in vector with
+//      - add_constant  : Constant value to add (usually 1<<(right_shifts-1),
+//                        but others can be used as well
+//      - right_shifts  : Number of right bit shifts (0-16)
+//      - vector_length : Number of samples in `in_vector` and `out_vector`
+//
+// Output:
+//      - out_vector    : Vector with the output
+//
+
+//
+// WebRtcSpl_AffineTransformVector(...)
+//
+// Affine transforms a vector, i.e, performs
+//  out_vector[k] = (in_vector[k]*gain+add_constant)>>right_shifts
+//
+// Input:
+//      - in_vector     : Input vector
+//      - gain          : Gain value, used to multiply the in vector with
+//      - add_constant  : Constant value to add (usually 1<<(right_shifts-1),
+//                        but others can be used as well
+//      - right_shifts  : Number of right bit shifts (0-16)
+//      - vector_length : Number of samples in `in_vector` and `out_vector`
+//
+// Output:
+//      - out_vector    : Vector with the output
+//
+
+//
+// WebRtcSpl_IncreaseSeed(...)
+//
+// Increases the seed (and returns the new value)
+//
+// Input:
+//      - seed      : Seed for random calculation
+//
+// Output:
+//      - seed      : Updated seed value
+//
+// Return value     : The new seed value
+//
+
+//
+// WebRtcSpl_RandU(...)
+//
+// Produces a uniformly distributed value in the int16_t range
+//
+// Input:
+//      - seed      : Seed for random calculation
+//
+// Output:
+//      - seed      : Updated seed value
+//
+// Return value     : Uniformly distributed value in the range
+//                    [Word16_MIN...Word16_MAX]
+//
+
+//
+// WebRtcSpl_RandN(...)
+//
+// Produces a normal distributed value in the int16_t range
+//
+// Input:
+//      - seed      : Seed for random calculation
+//
+// Output:
+//      - seed      : Updated seed value
+//
+// Return value     : N(0,1) value in the Q13 domain
+//
+
+//
+// WebRtcSpl_RandUArray(...)
+//
+// Produces a uniformly distributed vector with elements in the int16_t
+// range
+//
+// Input:
+//      - vector_length : Samples wanted in the vector
+//      - seed          : Seed for random calculation
+//
+// Output:
+//      - vector        : Vector with the uniform values
+//      - seed          : Updated seed value
+//
+// Return value         : Number of samples in vector, i.e., `vector_length`
+//
+
+//
+// WebRtcSpl_Sqrt(...)
+//
+// Returns the square root of the input value `value`. The precision of this
+// function is integer precision, i.e., sqrt(8) gives 2 as answer.
+// If `value` is a negative number then 0 is returned.
+//
+// Algorithm:
+//
+// A sixth order Taylor Series expansion is used here to compute the square
+// root of a number y^0.5 = (1+x)^0.5
+// where
+// x = y-1
+//   = 1+(x/2)-0.5*((x/2)^2+0.5*((x/2)^3-0.625*((x/2)^4+0.875*((x/2)^5)
+// 0.5 <= x < 1
+//
+// Input:
+//      - value     : Value to calculate sqrt of
+//
+// Return value     : Result of the sqrt calculation
+//
+
+//
+// WebRtcSpl_DivU32U16(...)
+//
+// Divides a uint32_t `num` by a uint16_t `den`.
+//
+// If `den`==0, (uint32_t)0xFFFFFFFF is returned.
+//
+// Input:
+//      - num       : Numerator
+//      - den       : Denominator
+//
+// Return value     : Result of the division (as a uint32_t), i.e., the
+//                    integer part of num/den.
+//
+
+//
+// WebRtcSpl_DivW32W16(...)
+//
+// Divides a int32_t `num` by a int16_t `den`.
+//
+// If `den`==0, (int32_t)0x7FFFFFFF is returned.
+//
+// Input:
+//      - num       : Numerator
+//      - den       : Denominator
+//
+// Return value     : Result of the division (as a int32_t), i.e., the
+//                    integer part of num/den.
+//
+
+//
+// WebRtcSpl_DivW32W16ResW16(...)
+//
+// Divides a int32_t `num` by a int16_t `den`, assuming that the
+// result is less than 32768, otherwise an unpredictable result will occur.
+//
+// If `den`==0, (int16_t)0x7FFF is returned.
+//
+// Input:
+//      - num       : Numerator
+//      - den       : Denominator
+//
+// Return value     : Result of the division (as a int16_t), i.e., the
+//                    integer part of num/den.
+//
+
+//
+// WebRtcSpl_DivResultInQ31(...)
+//
+// Divides a int32_t `num` by a int16_t `den`, assuming that the
+// absolute value of the denominator is larger than the numerator, otherwise
+// an unpredictable result will occur.
+//
+// Input:
+//      - num       : Numerator
+//      - den       : Denominator
+//
+// Return value     : Result of the division in Q31.
+//
+
+//
+// WebRtcSpl_DivW32HiLow(...)
+//
+// Divides a int32_t `num` by a denominator in hi, low format. The
+// absolute value of the denominator has to be larger (or equal to) the
+// numerator.
+//
+// Input:
+//      - num       : Numerator
+//      - den_hi    : High part of denominator
+//      - den_low   : Low part of denominator
+//
+// Return value     : Divided value in Q31
+//
+
+//
+// WebRtcSpl_Energy(...)
+//
+// Calculates the energy of a vector
+//
+// Input:
+//      - vector        : Vector which the energy should be calculated on
+//      - vector_length : Number of samples in vector
+//
+// Output:
+//      - scale_factor  : Number of left bit shifts needed to get the physical
+//                        energy value, i.e, to get the Q0 value
+//
+// Return value         : Energy value in Q(-`scale_factor`)
+//
+
+//
+// WebRtcSpl_FilterAR(...)
+//
+// Performs a 32-bit AR filtering on a vector in Q12
+//
+// Input:
+//  - ar_coef                   : AR-coefficient vector (values in Q12),
+//                                ar_coef[0] must be 4096.
+//  - ar_coef_length            : Number of coefficients in `ar_coef`.
+//  - in_vector                 : Vector to be filtered.
+//  - in_vector_length          : Number of samples in `in_vector`.
+//  - filter_state              : Current state (higher part) of the filter.
+//  - filter_state_length       : Length (in samples) of `filter_state`.
+//  - filter_state_low          : Current state (lower part) of the filter.
+//  - filter_state_low_length   : Length (in samples) of `filter_state_low`.
+//  - out_vector_low_length     : Maximum length (in samples) of
+//                                `out_vector_low`.
+//
+// Output:
+//  - filter_state              : Updated state (upper part) vector.
+//  - filter_state_low          : Updated state (lower part) vector.
+//  - out_vector                : Vector containing the upper part of the
+//                                filtered values.
+//  - out_vector_low            : Vector containing the lower part of the
+//                                filtered values.
+//
+// Return value                 : Number of samples in the `out_vector`.
+//
+
+//
+// WebRtcSpl_ComplexIFFT(...)
+//
+// Complex Inverse FFT
+//
+// Computes an inverse complex 2^`stages`-point FFT on the input vector, which
+// is in bit-reversed order. The original content of the vector is destroyed in
+// the process, since the input is overwritten by the output, normal-ordered,
+// FFT vector. With X as the input complex vector, y as the output complex
+// vector and with M = 2^`stages`, the following is computed:
+//
+//        M-1
+// y(k) = sum[X(i)*[cos(2*pi*i*k/M) + j*sin(2*pi*i*k/M)]]
+//        i=0
+//
+// The implementations are optimized for speed, not for code size. It uses the
+// decimation-in-time algorithm with radix-2 butterfly technique.
+//
+// Input:
+//      - vector    : In pointer to complex vector containing 2^`stages`
+//                    real elements interleaved with 2^`stages` imaginary
+//                    elements.
+//                    [ReImReImReIm....]
+//                    The elements are in Q(-scale) domain, see more on Return
+//                    Value below.
+//
+//      - stages    : Number of FFT stages. Must be at least 3 and at most 10,
+//                    since the table WebRtcSpl_kSinTable1024[] is 1024
+//                    elements long.
+//
+//      - mode      : This parameter gives the user to choose how the FFT
+//                    should work.
+//                    mode==0: Low-complexity and Low-accuracy mode
+//                    mode==1: High-complexity and High-accuracy mode
+//
+// Output:
+//      - vector    : Out pointer to the FFT vector (the same as input).
+//
+// Return Value     : The scale value that tells the number of left bit shifts
+//                    that the elements in the `vector` should be shifted with
+//                    in order to get Q0 values, i.e. the physically correct
+//                    values. The scale parameter is always 0 or positive,
+//                    except if N>1024 (`stages`>10), which returns a scale
+//                    value of -1, indicating error.
+//
+
+//
+// WebRtcSpl_ComplexFFT(...)
+//
+// Complex FFT
+//
+// Computes a complex 2^`stages`-point FFT on the input vector, which is in
+// bit-reversed order. The original content of the vector is destroyed in
+// the process, since the input is overwritten by the output, normal-ordered,
+// FFT vector. With x as the input complex vector, Y as the output complex
+// vector and with M = 2^`stages`, the following is computed:
+//
+//              M-1
+// Y(k) = 1/M * sum[x(i)*[cos(2*pi*i*k/M) + j*sin(2*pi*i*k/M)]]
+//              i=0
+//
+// The implementations are optimized for speed, not for code size. It uses the
+// decimation-in-time algorithm with radix-2 butterfly technique.
+//
+// This routine prevents overflow by scaling by 2 before each FFT stage. This is
+// a fixed scaling, for proper normalization - there will be log2(n) passes, so
+// this results in an overall factor of 1/n, distributed to maximize arithmetic
+// accuracy.
+//
+// Input:
+//      - vector    : In pointer to complex vector containing 2^`stages` real
+//                    elements interleaved with 2^`stages` imaginary elements.
+//                    [ReImReImReIm....]
+//                    The output is in the Q0 domain.
+//
+//      - stages    : Number of FFT stages. Must be at least 3 and at most 10,
+//                    since the table WebRtcSpl_kSinTable1024[] is 1024
+//                    elements long.
+//
+//      - mode      : This parameter gives the user to choose how the FFT
+//                    should work.
+//                    mode==0: Low-complexity and Low-accuracy mode
+//                    mode==1: High-complexity and High-accuracy mode
+//
+// Output:
+//      - vector    : The output FFT vector is in the Q0 domain.
+//
+// Return value     : The scale parameter is always 0, except if N>1024,
+//                    which returns a scale value of -1, indicating error.
+//
+
+//
+// WebRtcSpl_AnalysisQMF(...)
+//
+// Splits a 0-2*F Hz signal into two sub bands: 0-F Hz and F-2*F Hz. The
+// current version has F = 8000, therefore, a super-wideband audio signal is
+// split to lower-band 0-8 kHz and upper-band 8-16 kHz.
+//
+// Input:
+//      - in_data       : Wide band speech signal, 320 samples (10 ms)
+//
+// Input & Output:
+//      - filter_state1 : Filter state for first All-pass filter
+//      - filter_state2 : Filter state for second All-pass filter
+//
+// Output:
+//      - low_band      : Lower-band signal 0-8 kHz band, 160 samples (10 ms)
+//      - high_band     : Upper-band signal 8-16 kHz band (flipped in frequency
+//                        domain), 160 samples (10 ms)
+//
+
+//
+// WebRtcSpl_SynthesisQMF(...)
+//
+// Combines the two sub bands (0-F and F-2*F Hz) into a signal of 0-2*F
+// Hz, (current version has F = 8000 Hz). So the filter combines lower-band
+// (0-8 kHz) and upper-band (8-16 kHz) channels to obtain super-wideband 0-16
+// kHz audio.
+//
+// Input:
+//      - low_band      : The signal with the 0-8 kHz band, 160 samples (10 ms)
+//      - high_band     : The signal with the 8-16 kHz band, 160 samples (10 ms)
+//
+// Input & Output:
+//      - filter_state1 : Filter state for first All-pass filter
+//      - filter_state2 : Filter state for second All-pass filter
+//
+// Output:
+//      - out_data      : Super-wideband speech signal, 0-16 kHz
+//
+
+// int16_t WebRtcSpl_SatW32ToW16(...)
+//
+// This function saturates a 32-bit word into a 16-bit word.
+//
+// Input:
+//      - value32   : The value of a 32-bit word.
+//
+// Output:
+//      - out16     : the saturated 16-bit word.
+//
+
+// int32_t WebRtc_MulAccumW16(...)
+//
+// This function multiply a 16-bit word by a 16-bit word, and accumulate this
+// value to a 32-bit integer.
+//
+// Input:
+//      - a    : The value of the first 16-bit word.
+//      - b    : The value of the second 16-bit word.
+//      - c    : The value of an 32-bit integer.
+//
+// Return Value: The value of a * b + c.
+//
diff --git a/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl.h b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl.h
new file mode 100644
index 0000000000..2b0995886a
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl.h
@@ -0,0 +1,155 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// This header file includes the inline functions in
+// the fix point signal processing library.
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_
+
+#include <stdint.h>
+
+#include "rtc_base/compile_assert_c.h"
+
+extern const int8_t kWebRtcSpl_CountLeadingZeros32_Table[64];
+
+// Don't call this directly except in tests!
+static __inline int WebRtcSpl_CountLeadingZeros32_NotBuiltin(uint32_t n) {
+  // Normalize n by rounding up to the nearest number that is a sequence of 0
+  // bits followed by a sequence of 1 bits. This number has the same number of
+  // leading zeros as the original n. There are exactly 33 such values.
+  n |= n >> 1;
+  n |= n >> 2;
+  n |= n >> 4;
+  n |= n >> 8;
+  n |= n >> 16;
+
+  // Multiply the modified n with a constant selected (by exhaustive search)
+  // such that each of the 33 possible values of n give a product whose 6 most
+  // significant bits are unique. Then look up the answer in the table.
+  return kWebRtcSpl_CountLeadingZeros32_Table[(n * 0x8c0b2891) >> 26];
+}
+
+// Don't call this directly except in tests!
+static __inline int WebRtcSpl_CountLeadingZeros64_NotBuiltin(uint64_t n) {
+  const int leading_zeros = n >> 32 == 0 ? 32 : 0;
+  return leading_zeros + WebRtcSpl_CountLeadingZeros32_NotBuiltin(
+                             (uint32_t)(n >> (32 - leading_zeros)));
+}
+
+// Returns the number of leading zero bits in the argument.
+static __inline int WebRtcSpl_CountLeadingZeros32(uint32_t n) {
+#ifdef __GNUC__
+  RTC_COMPILE_ASSERT(sizeof(unsigned int) == sizeof(uint32_t));
+  return n == 0 ? 32 : __builtin_clz(n);
+#else
+  return WebRtcSpl_CountLeadingZeros32_NotBuiltin(n);
+#endif
+}
+
+// Returns the number of leading zero bits in the argument.
+static __inline int WebRtcSpl_CountLeadingZeros64(uint64_t n) {
+#ifdef __GNUC__
+  RTC_COMPILE_ASSERT(sizeof(unsigned long long) == sizeof(uint64_t));  // NOLINT
+  return n == 0 ? 64 : __builtin_clzll(n);
+#else
+  return WebRtcSpl_CountLeadingZeros64_NotBuiltin(n);
+#endif
+}
+
+#ifdef WEBRTC_ARCH_ARM_V7
+#include "common_audio/signal_processing/include/spl_inl_armv7.h"
+#else
+
+#if defined(MIPS32_LE)
+#include "common_audio/signal_processing/include/spl_inl_mips.h"
+#endif
+
+#if !defined(MIPS_DSP_R1_LE)
+static __inline int16_t WebRtcSpl_SatW32ToW16(int32_t value32) {
+  int16_t out16 = (int16_t)value32;
+
+  if (value32 > 32767)
+    out16 = 32767;
+  else if (value32 < -32768)
+    out16 = -32768;
+
+  return out16;
+}
+
+static __inline int32_t WebRtcSpl_AddSatW32(int32_t a, int32_t b) {
+  // Do the addition in unsigned numbers, since signed overflow is undefined
+  // behavior.
+  const int32_t sum = (int32_t)((uint32_t)a + (uint32_t)b);
+
+  // a + b can't overflow if a and b have different signs. If they have the
+  // same sign, a + b also has the same sign iff it didn't overflow.
+  if ((a < 0) == (b < 0) && (a < 0) != (sum < 0)) {
+    // The direction of the overflow is obvious from the sign of a + b.
+    return sum < 0 ? INT32_MAX : INT32_MIN;
+  }
+  return sum;
+}
+
+static __inline int32_t WebRtcSpl_SubSatW32(int32_t a, int32_t b) {
+  // Do the subtraction in unsigned numbers, since signed overflow is undefined
+  // behavior.
+  const int32_t diff = (int32_t)((uint32_t)a - (uint32_t)b);
+
+  // a - b can't overflow if a and b have the same sign. If they have different
+  // signs, a - b has the same sign as a iff it didn't overflow.
+  if ((a < 0) != (b < 0) && (a < 0) != (diff < 0)) {
+    // The direction of the overflow is obvious from the sign of a - b.
+    return diff < 0 ? INT32_MAX : INT32_MIN;
+  }
+  return diff;
+}
+
+static __inline int16_t WebRtcSpl_AddSatW16(int16_t a, int16_t b) {
+  return WebRtcSpl_SatW32ToW16((int32_t)a + (int32_t)b);
+}
+
+static __inline int16_t WebRtcSpl_SubSatW16(int16_t var1, int16_t var2) {
+  return WebRtcSpl_SatW32ToW16((int32_t)var1 - (int32_t)var2);
+}
+#endif  // #if !defined(MIPS_DSP_R1_LE)
+
+#if !defined(MIPS32_LE)
+static __inline int16_t WebRtcSpl_GetSizeInBits(uint32_t n) {
+  return 32 - WebRtcSpl_CountLeadingZeros32(n);
+}
+
+// Return the number of steps a can be left-shifted without overflow,
+// or 0 if a == 0.
+static __inline int16_t WebRtcSpl_NormW32(int32_t a) {
+  return a == 0 ? 0 : WebRtcSpl_CountLeadingZeros32(a < 0 ? ~a : a) - 1;
+}
+
+// Return the number of steps a can be left-shifted without overflow,
+// or 0 if a == 0.
+static __inline int16_t WebRtcSpl_NormU32(uint32_t a) {
+  return a == 0 ? 0 : WebRtcSpl_CountLeadingZeros32(a);
+}
+
+// Return the number of steps a can be left-shifted without overflow,
+// or 0 if a == 0.
+static __inline int16_t WebRtcSpl_NormW16(int16_t a) {
+  const int32_t a32 = a;
+  return a == 0 ? 0 : WebRtcSpl_CountLeadingZeros32(a < 0 ? ~a32 : a32) - 17;
+}
+
+static __inline int32_t WebRtc_MulAccumW16(int16_t a, int16_t b, int32_t c) {
+  return (a * b + c);
+}
+#endif  // #if !defined(MIPS32_LE)
+
+#endif  // WEBRTC_ARCH_ARM_V7
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_
diff --git a/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl_armv7.h b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl_armv7.h
new file mode 100644
index 0000000000..6fc3e7c1b8
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl_armv7.h
@@ -0,0 +1,138 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/* This header file includes the inline functions for ARM processors in
+ * the fix point signal processing library.
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
+
+#include <stdint.h>
+
+/* TODO(kma): Replace some assembly code with GCC intrinsics
+ * (e.g. __builtin_clz).
+ */
+
+/* This function produces result that is not bit exact with that by the generic
+ * C version in some cases, although the former is at least as accurate as the
+ * later.
+ */
+static __inline int32_t WEBRTC_SPL_MUL_16_32_RSFT16(int16_t a, int32_t b) {
+  int32_t tmp = 0;
+  __asm __volatile("smulwb %0, %1, %2" : "=r"(tmp) : "r"(b), "r"(a));
+  return tmp;
+}
+
+static __inline int32_t WEBRTC_SPL_MUL_16_16(int16_t a, int16_t b) {
+  int32_t tmp = 0;
+  __asm __volatile("smulbb %0, %1, %2" : "=r"(tmp) : "r"(a), "r"(b));
+  return tmp;
+}
+
+// TODO(kma): add unit test.
+static __inline int32_t WebRtc_MulAccumW16(int16_t a, int16_t b, int32_t c) {
+  int32_t tmp = 0;
+  __asm __volatile("smlabb %0, %1, %2, %3"
+                   : "=r"(tmp)
+                   : "r"(a), "r"(b), "r"(c));
+  return tmp;
+}
+
+static __inline int16_t WebRtcSpl_AddSatW16(int16_t a, int16_t b) {
+  int32_t s_sum = 0;
+
+  __asm __volatile("qadd16 %0, %1, %2" : "=r"(s_sum) : "r"(a), "r"(b));
+
+  return (int16_t)s_sum;
+}
+
+static __inline int32_t WebRtcSpl_AddSatW32(int32_t l_var1, int32_t l_var2) {
+  int32_t l_sum = 0;
+
+  __asm __volatile("qadd %0, %1, %2" : "=r"(l_sum) : "r"(l_var1), "r"(l_var2));
+
+  return l_sum;
+}
+
+static __inline int32_t WebRtcSpl_SubSatW32(int32_t l_var1, int32_t l_var2) {
+  int32_t l_sub = 0;
+
+  __asm __volatile("qsub %0, %1, %2" : "=r"(l_sub) : "r"(l_var1), "r"(l_var2));
+
+  return l_sub;
+}
+
+static __inline int16_t WebRtcSpl_SubSatW16(int16_t var1, int16_t var2) {
+  int32_t s_sub = 0;
+
+  __asm __volatile("qsub16 %0, %1, %2" : "=r"(s_sub) : "r"(var1), "r"(var2));
+
+  return (int16_t)s_sub;
+}
+
+static __inline int16_t WebRtcSpl_GetSizeInBits(uint32_t n) {
+  int32_t tmp = 0;
+
+  __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(n));
+
+  return (int16_t)(32 - tmp);
+}
+
+static __inline int16_t WebRtcSpl_NormW32(int32_t a) {
+  int32_t tmp = 0;
+
+  if (a == 0) {
+    return 0;
+  } else if (a < 0) {
+    a ^= 0xFFFFFFFF;
+  }
+
+  __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(a));
+
+  return (int16_t)(tmp - 1);
+}
+
+static __inline int16_t WebRtcSpl_NormU32(uint32_t a) {
+  int tmp = 0;
+
+  if (a == 0)
+    return 0;
+
+  __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(a));
+
+  return (int16_t)tmp;
+}
+
+static __inline int16_t WebRtcSpl_NormW16(int16_t a) {
+  int32_t tmp = 0;
+  int32_t a_32 = a;
+
+  if (a_32 == 0) {
+    return 0;
+  } else if (a_32 < 0) {
+    a_32 ^= 0xFFFFFFFF;
+  }
+
+  __asm __volatile("clz %0, %1" : "=r"(tmp) : "r"(a_32));
+
+  return (int16_t)(tmp - 17);
+}
+
+// TODO(kma): add unit test.
+static __inline int16_t WebRtcSpl_SatW32ToW16(int32_t value32) {
+  int32_t out = 0;
+
+  __asm __volatile("ssat %0, #16, %1" : "=r"(out) : "r"(value32));
+
+  return (int16_t)out;
+}
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_ARMV7_H_
diff --git a/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl_mips.h b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl_mips.h
new file mode 100644
index 0000000000..1db95e8254
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl_mips.h
@@ -0,0 +1,204 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// This header file includes the inline functions in
+// the fix point signal processing library.
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_MIPS_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_MIPS_H_
+
+static __inline int32_t WEBRTC_SPL_MUL_16_16(int32_t a, int32_t b) {
+  int32_t value32 = 0;
+  int32_t a1 = 0, b1 = 0;
+
+  __asm __volatile(
+#if defined(MIPS32_R2_LE)
+      "seh    %[a1],          %[a]                \n\t"
+      "seh    %[b1],          %[b]                \n\t"
+#else
+      "sll    %[a1],          %[a],         16    \n\t"
+      "sll    %[b1],          %[b],         16    \n\t"
+      "sra    %[a1],          %[a1],        16    \n\t"
+      "sra    %[b1],          %[b1],        16    \n\t"
+#endif
+      "mul    %[value32],     %[a1],  %[b1]       \n\t"
+      : [value32] "=r"(value32), [a1] "=&r"(a1), [b1] "=&r"(b1)
+      : [a] "r"(a), [b] "r"(b)
+      : "hi", "lo");
+  return value32;
+}
+
+static __inline int32_t WEBRTC_SPL_MUL_16_32_RSFT16(int16_t a, int32_t b) {
+  int32_t value32 = 0, b1 = 0, b2 = 0;
+  int32_t a1 = 0;
+
+  __asm __volatile(
+#if defined(MIPS32_R2_LE)
+      "seh    %[a1],          %[a]                        \n\t"
+#else
+      "sll    %[a1],          %[a],           16          \n\t"
+      "sra    %[a1],          %[a1],          16          \n\t"
+#endif
+      "andi   %[b2],          %[b],           0xFFFF      \n\t"
+      "sra    %[b1],          %[b],           16          \n\t"
+      "sra    %[b2],          %[b2],          1           \n\t"
+      "mul    %[value32],     %[a1],          %[b1]       \n\t"
+      "mul    %[b2],          %[a1],          %[b2]       \n\t"
+      "addiu  %[b2],          %[b2],          0x4000      \n\t"
+      "sra    %[b2],          %[b2],          15          \n\t"
+      "addu   %[value32],     %[value32],     %[b2]       \n\t"
+      : [value32] "=&r"(value32), [b1] "=&r"(b1), [b2] "=&r"(b2), [a1] "=&r"(a1)
+      : [a] "r"(a), [b] "r"(b)
+      : "hi", "lo");
+  return value32;
+}
+
+#if defined(MIPS_DSP_R1_LE)
+static __inline int16_t WebRtcSpl_SatW32ToW16(int32_t value32) {
+  __asm __volatile(
+      "shll_s.w   %[value32], %[value32], 16      \n\t"
+      "sra        %[value32], %[value32], 16      \n\t"
+      : [value32] "+r"(value32)
+      :);
+  int16_t out16 = (int16_t)value32;
+  return out16;
+}
+
+static __inline int16_t WebRtcSpl_AddSatW16(int16_t a, int16_t b) {
+  int32_t value32 = 0;
+
+  __asm __volatile("addq_s.ph      %[value32],     %[a],   %[b]    \n\t"
+                   : [value32] "=r"(value32)
+                   : [a] "r"(a), [b] "r"(b));
+  return (int16_t)value32;
+}
+
+static __inline int32_t WebRtcSpl_AddSatW32(int32_t l_var1, int32_t l_var2) {
+  int32_t l_sum;
+
+  __asm __volatile(
+      "addq_s.w   %[l_sum],       %[l_var1],      %[l_var2]    \n\t"
+      : [l_sum] "=r"(l_sum)
+      : [l_var1] "r"(l_var1), [l_var2] "r"(l_var2));
+
+  return l_sum;
+}
+
+static __inline int16_t WebRtcSpl_SubSatW16(int16_t var1, int16_t var2) {
+  int32_t value32;
+
+  __asm __volatile("subq_s.ph  %[value32], %[var1],    %[var2]     \n\t"
+                   : [value32] "=r"(value32)
+                   : [var1] "r"(var1), [var2] "r"(var2));
+
+  return (int16_t)value32;
+}
+
+static __inline int32_t WebRtcSpl_SubSatW32(int32_t l_var1, int32_t l_var2) {
+  int32_t l_diff;
+
+  __asm __volatile(
+      "subq_s.w   %[l_diff],      %[l_var1],      %[l_var2]    \n\t"
+      : [l_diff] "=r"(l_diff)
+      : [l_var1] "r"(l_var1), [l_var2] "r"(l_var2));
+
+  return l_diff;
+}
+#endif
+
+static __inline int16_t WebRtcSpl_GetSizeInBits(uint32_t n) {
+  int bits = 0;
+  int i32 = 32;
+
+  __asm __volatile(
+      "clz    %[bits],    %[n]                    \n\t"
+      "subu   %[bits],    %[i32],     %[bits]     \n\t"
+      : [bits] "=&r"(bits)
+      : [n] "r"(n), [i32] "r"(i32));
+
+  return (int16_t)bits;
+}
+
+static __inline int16_t WebRtcSpl_NormW32(int32_t a) {
+  int zeros = 0;
+
+  __asm __volatile(
+      ".set       push                                \n\t"
+      ".set       noreorder                           \n\t"
+      "bnez       %[a],       1f                      \n\t"
+      " sra       %[zeros],   %[a],       31          \n\t"
+      "b          2f                                  \n\t"
+      " move      %[zeros],   $zero                   \n\t"
+      "1:                                              \n\t"
+      "xor        %[zeros],   %[a],       %[zeros]    \n\t"
+      "clz        %[zeros],   %[zeros]                \n\t"
+      "addiu      %[zeros],   %[zeros],   -1          \n\t"
+      "2:                                              \n\t"
+      ".set       pop                                 \n\t"
+      : [zeros] "=&r"(zeros)
+      : [a] "r"(a));
+
+  return (int16_t)zeros;
+}
+
+static __inline int16_t WebRtcSpl_NormU32(uint32_t a) {
+  int zeros = 0;
+
+  __asm __volatile("clz    %[zeros],   %[a]    \n\t"
+                   : [zeros] "=r"(zeros)
+                   : [a] "r"(a));
+
+  return (int16_t)(zeros & 0x1f);
+}
+
+static __inline int16_t WebRtcSpl_NormW16(int16_t a) {
+  int zeros = 0;
+  int a0 = a << 16;
+
+  __asm __volatile(
+      ".set       push                                \n\t"
+      ".set       noreorder                           \n\t"
+      "bnez       %[a0],      1f                      \n\t"
+      " sra       %[zeros],   %[a0],      31          \n\t"
+      "b          2f                                  \n\t"
+      " move      %[zeros],   $zero                   \n\t"
+      "1:                                              \n\t"
+      "xor        %[zeros],   %[a0],      %[zeros]    \n\t"
+      "clz        %[zeros],   %[zeros]                \n\t"
+      "addiu      %[zeros],   %[zeros],   -1          \n\t"
+      "2:                                              \n\t"
+      ".set       pop                                 \n\t"
+      : [zeros] "=&r"(zeros)
+      : [a0] "r"(a0));
+
+  return (int16_t)zeros;
+}
+
+static __inline int32_t WebRtc_MulAccumW16(int16_t a, int16_t b, int32_t c) {
+  int32_t res = 0, c1 = 0;
+  __asm __volatile(
+#if defined(MIPS32_R2_LE)
+      "seh    %[a],       %[a]            \n\t"
+      "seh    %[b],       %[b]            \n\t"
+#else
+      "sll    %[a],       %[a],   16      \n\t"
+      "sll    %[b],       %[b],   16      \n\t"
+      "sra    %[a],       %[a],   16      \n\t"
+      "sra    %[b],       %[b],   16      \n\t"
+#endif
+      "mul    %[res],     %[a],   %[b]    \n\t"
+      "addu   %[c1],      %[c],   %[res]  \n\t"
+      : [c1] "=r"(c1), [res] "=&r"(res)
+      : [a] "r"(a), [b] "r"(b), [c] "r"(c)
+      : "hi", "lo");
+  return (c1);
+}
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_MIPS_H_
diff --git a/third_party/libwebrtc/common_audio/signal_processing/levinson_durbin.c b/third_party/libwebrtc/common_audio/signal_processing/levinson_durbin.c
new file mode 100644
index 0000000000..2c5cbaeeaa
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/levinson_durbin.c
@@ -0,0 +1,249 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_LevinsonDurbin().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/sanitizer.h"
+
+#define SPL_LEVINSON_MAXORDER 20
+
+int16_t RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_LevinsonDurbin(const int32_t* R, int16_t* A, int16_t* K,
+                         size_t order)
+{
+    size_t i, j;
+    // Auto-correlation coefficients in high precision
+    int16_t R_hi[SPL_LEVINSON_MAXORDER + 1], R_low[SPL_LEVINSON_MAXORDER + 1];
+    // LPC coefficients in high precision
+    int16_t A_hi[SPL_LEVINSON_MAXORDER + 1], A_low[SPL_LEVINSON_MAXORDER + 1];
+    // LPC coefficients for next iteration
+    int16_t A_upd_hi[SPL_LEVINSON_MAXORDER + 1], A_upd_low[SPL_LEVINSON_MAXORDER + 1];
+    // Reflection coefficient in high precision
+    int16_t K_hi, K_low;
+    // Prediction gain Alpha in high precision and with scale factor
+    int16_t Alpha_hi, Alpha_low, Alpha_exp;
+    int16_t tmp_hi, tmp_low;
+    int32_t temp1W32, temp2W32, temp3W32;
+    int16_t norm;
+
+    // Normalize the autocorrelation R[0]...R[order+1]
+
+    norm = WebRtcSpl_NormW32(R[0]);
+
+    for (i = 0; i <= order; ++i)
+    {
+        temp1W32 = R[i] * (1 << norm);
+        // UBSan: 12 * 268435456 cannot be represented in type 'int'
+
+        // Put R in hi and low format
+        R_hi[i] = (int16_t)(temp1W32 >> 16);
+        R_low[i] = (int16_t)((temp1W32 - ((int32_t)R_hi[i] * 65536)) >> 1);
+    }
+
+    // K = A[1] = -R[1] / R[0]
+
+    temp2W32 = R[1] * (1 << norm); // R[1] in Q31
+    temp3W32 = WEBRTC_SPL_ABS_W32(temp2W32); // abs R[1]
+    temp1W32 = WebRtcSpl_DivW32HiLow(temp3W32, R_hi[0], R_low[0]); // abs(R[1])/R[0] in Q31
+    // Put back the sign on R[1]
+    if (temp2W32 > 0)
+    {
+        temp1W32 = -temp1W32;
+    }
+
+    // Put K in hi and low format
+    K_hi = (int16_t)(temp1W32 >> 16);
+    K_low = (int16_t)((temp1W32 - ((int32_t)K_hi * 65536)) >> 1);
+
+    // Store first reflection coefficient
+    K[0] = K_hi;
+
+    temp1W32 >>= 4;  // A[1] in Q27.
+
+    // Put A[1] in hi and low format
+    A_hi[1] = (int16_t)(temp1W32 >> 16);
+    A_low[1] = (int16_t)((temp1W32 - ((int32_t)A_hi[1] * 65536)) >> 1);
+
+    // Alpha = R[0] * (1-K^2)
+
+    temp1W32 = ((K_hi * K_low >> 14) + K_hi * K_hi) * 2;  // = k^2 in Q31
+
+    temp1W32 = WEBRTC_SPL_ABS_W32(temp1W32); // Guard against <0
+    temp1W32 = (int32_t)0x7fffffffL - temp1W32; // temp1W32 = (1 - K[0]*K[0]) in Q31
+
+    // Store temp1W32 = 1 - K[0]*K[0] on hi and low format
+    tmp_hi = (int16_t)(temp1W32 >> 16);
+    tmp_low = (int16_t)((temp1W32 - ((int32_t)tmp_hi << 16)) >> 1);
+
+    // Calculate Alpha in Q31
+    temp1W32 = (R_hi[0] * tmp_hi + (R_hi[0] * tmp_low >> 15) +
+        (R_low[0] * tmp_hi >> 15)) << 1;
+
+    // Normalize Alpha and put it in hi and low format
+
+    Alpha_exp = WebRtcSpl_NormW32(temp1W32);
+    temp1W32 = WEBRTC_SPL_LSHIFT_W32(temp1W32, Alpha_exp);
+    Alpha_hi = (int16_t)(temp1W32 >> 16);
+    Alpha_low = (int16_t)((temp1W32 - ((int32_t)Alpha_hi << 16)) >> 1);
+
+    // Perform the iterative calculations in the Levinson-Durbin algorithm
+
+    for (i = 2; i <= order; i++)
+    {
+        /*                    ----
+         temp1W32 =  R[i] + > R[j]*A[i-j]
+         /
+         ----
+         j=1..i-1
+         */
+
+        temp1W32 = 0;
+
+        for (j = 1; j < i; j++)
+        {
+          // temp1W32 is in Q31
+          temp1W32 += (R_hi[j] * A_hi[i - j] * 2) +
+              (((R_hi[j] * A_low[i - j] >> 15) +
+              (R_low[j] * A_hi[i - j] >> 15)) * 2);
+        }
+
+        temp1W32 = temp1W32 * 16;
+        temp1W32 += ((int32_t)R_hi[i] * 65536)
+                + WEBRTC_SPL_LSHIFT_W32((int32_t)R_low[i], 1);
+
+        // K = -temp1W32 / Alpha
+        temp2W32 = WEBRTC_SPL_ABS_W32(temp1W32); // abs(temp1W32)
+        temp3W32 = WebRtcSpl_DivW32HiLow(temp2W32, Alpha_hi, Alpha_low); // abs(temp1W32)/Alpha
+
+        // Put the sign of temp1W32 back again
+        if (temp1W32 > 0)
+        {
+            temp3W32 = -temp3W32;
+        }
+
+        // Use the Alpha shifts from earlier to de-normalize
+        norm = WebRtcSpl_NormW32(temp3W32);
+        if ((Alpha_exp <= norm) || (temp3W32 == 0))
+        {
+            temp3W32 = temp3W32 * (1 << Alpha_exp);
+        } else
+        {
+            if (temp3W32 > 0)
+            {
+                temp3W32 = (int32_t)0x7fffffffL;
+            } else
+            {
+                temp3W32 = (int32_t)0x80000000L;
+            }
+        }
+
+        // Put K on hi and low format
+        K_hi = (int16_t)(temp3W32 >> 16);
+        K_low = (int16_t)((temp3W32 - ((int32_t)K_hi * 65536)) >> 1);
+
+        // Store Reflection coefficient in Q15
+        K[i - 1] = K_hi;
+
+        // Test for unstable filter.
+        // If unstable return 0 and let the user decide what to do in that case
+
+        if ((int32_t)WEBRTC_SPL_ABS_W16(K_hi) > (int32_t)32750)
+        {
+            return 0; // Unstable filter
+        }
+
+        /*
+         Compute updated LPC coefficient: Anew[i]
+         Anew[j]= A[j] + K*A[i-j]   for j=1..i-1
+         Anew[i]= K
+         */
+
+        for (j = 1; j < i; j++)
+        {
+            // temp1W32 = A[j] in Q27
+            temp1W32 = (int32_t)A_hi[j] * 65536
+                    + WEBRTC_SPL_LSHIFT_W32((int32_t)A_low[j],1);
+
+            // temp1W32 += K*A[i-j] in Q27
+            temp1W32 += (K_hi * A_hi[i - j] + (K_hi * A_low[i - j] >> 15) +
+                (K_low * A_hi[i - j] >> 15)) * 2;
+
+            // Put Anew in hi and low format
+            A_upd_hi[j] = (int16_t)(temp1W32 >> 16);
+            A_upd_low[j] = (int16_t)(
+                (temp1W32 - ((int32_t)A_upd_hi[j] * 65536)) >> 1);
+        }
+
+        // temp3W32 = K in Q27 (Convert from Q31 to Q27)
+        temp3W32 >>= 4;
+
+        // Store Anew in hi and low format
+        A_upd_hi[i] = (int16_t)(temp3W32 >> 16);
+        A_upd_low[i] = (int16_t)(
+            (temp3W32 - ((int32_t)A_upd_hi[i] * 65536)) >> 1);
+
+        // Alpha = Alpha * (1-K^2)
+
+        temp1W32 = ((K_hi * K_low >> 14) + K_hi * K_hi) * 2;  // K*K in Q31
+
+        temp1W32 = WEBRTC_SPL_ABS_W32(temp1W32); // Guard against <0
+        temp1W32 = (int32_t)0x7fffffffL - temp1W32; // 1 - K*K  in Q31
+
+        // Convert 1- K^2 in hi and low format
+        tmp_hi = (int16_t)(temp1W32 >> 16);
+        tmp_low = (int16_t)((temp1W32 - ((int32_t)tmp_hi << 16)) >> 1);
+
+        // Calculate Alpha = Alpha * (1-K^2) in Q31
+        temp1W32 = (Alpha_hi * tmp_hi + (Alpha_hi * tmp_low >> 15) +
+            (Alpha_low * tmp_hi >> 15)) << 1;
+
+        // Normalize Alpha and store it on hi and low format
+
+        norm = WebRtcSpl_NormW32(temp1W32);
+        temp1W32 = WEBRTC_SPL_LSHIFT_W32(temp1W32, norm);
+
+        Alpha_hi = (int16_t)(temp1W32 >> 16);
+        Alpha_low = (int16_t)((temp1W32 - ((int32_t)Alpha_hi << 16)) >> 1);
+
+        // Update the total normalization of Alpha
+        Alpha_exp = Alpha_exp + norm;
+
+        // Update A[]
+
+        for (j = 1; j <= i; j++)
+        {
+            A_hi[j] = A_upd_hi[j];
+            A_low[j] = A_upd_low[j];
+        }
+    }
+
+    /*
+     Set A[0] to 1.0 and store the A[i] i=1...order in Q12
+     (Convert from Q27 and use rounding)
+     */
+
+    A[0] = 4096;
+
+    for (i = 1; i <= order; i++)
+    {
+        // temp1W32 in Q27
+        temp1W32 = (int32_t)A_hi[i] * 65536
+                + WEBRTC_SPL_LSHIFT_W32((int32_t)A_low[i], 1);
+        // Round and store upper word
+        A[i] = (int16_t)(((temp1W32 * 2) + 32768) >> 16);
+    }
+    return 1; // Stable filters
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/lpc_to_refl_coef.c b/third_party/libwebrtc/common_audio/signal_processing/lpc_to_refl_coef.c
new file mode 100644
index 0000000000..7a5e25191b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/lpc_to_refl_coef.c
@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_LpcToReflCoef().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#define SPL_LPC_TO_REFL_COEF_MAX_AR_MODEL_ORDER 50
+
+void WebRtcSpl_LpcToReflCoef(int16_t* a16, int use_order, int16_t* k16)
+{
+    int m, k;
+    int32_t tmp32[SPL_LPC_TO_REFL_COEF_MAX_AR_MODEL_ORDER];
+    int32_t tmp_inv_denom32;
+    int16_t tmp_inv_denom16;
+
+    k16[use_order - 1] = a16[use_order] << 3;  // Q12<<3 => Q15
+    for (m = use_order - 1; m > 0; m--)
+    {
+        // (1 - k^2) in Q30
+        tmp_inv_denom32 = 1073741823 - k16[m] * k16[m];
+        // (1 - k^2) in Q15
+        tmp_inv_denom16 = (int16_t)(tmp_inv_denom32 >> 15);
+
+        for (k = 1; k <= m; k++)
+        {
+            // tmp[k] = (a[k] - RC[m] * a[m-k+1]) / (1.0 - RC[m]*RC[m]);
+
+            // [Q12<<16 - (Q15*Q12)<<1] = [Q28 - Q28] = Q28
+            tmp32[k] = (a16[k] << 16) - (k16[m] * a16[m - k + 1] << 1);
+
+            tmp32[k] = WebRtcSpl_DivW32W16(tmp32[k], tmp_inv_denom16); //Q28/Q15 = Q13
+        }
+
+        for (k = 1; k < m; k++)
+        {
+            a16[k] = (int16_t)(tmp32[k] >> 1);  // Q13>>1 => Q12
+        }
+
+        tmp32[m] = WEBRTC_SPL_SAT(8191, tmp32[m], -8191);
+        k16[m - 1] = (int16_t)WEBRTC_SPL_LSHIFT_W32(tmp32[m], 2); //Q13<<2 => Q15
+    }
+    return;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/min_max_operations.c b/third_party/libwebrtc/common_audio/signal_processing/min_max_operations.c
new file mode 100644
index 0000000000..6acf88287b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/min_max_operations.c
@@ -0,0 +1,258 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This file contains the implementation of functions
+ * WebRtcSpl_MaxAbsValueW16C()
+ * WebRtcSpl_MaxAbsValueW32C()
+ * WebRtcSpl_MaxValueW16C()
+ * WebRtcSpl_MaxValueW32C()
+ * WebRtcSpl_MinValueW16C()
+ * WebRtcSpl_MinValueW32C()
+ * WebRtcSpl_MaxAbsIndexW16()
+ * WebRtcSpl_MaxIndexW16()
+ * WebRtcSpl_MaxIndexW32()
+ * WebRtcSpl_MinIndexW16()
+ * WebRtcSpl_MinIndexW32()
+ *
+ */
+
+#include <stdlib.h>
+#include <limits.h>
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// TODO(bjorn/kma): Consolidate function pairs (e.g. combine
+//   WebRtcSpl_MaxAbsValueW16C and WebRtcSpl_MaxAbsIndexW16 into a single one.)
+// TODO(kma): Move the next six functions into min_max_operations_c.c.
+
+// Maximum absolute value of word16 vector. C version for generic platforms.
+int16_t WebRtcSpl_MaxAbsValueW16C(const int16_t* vector, size_t length) {
+  size_t i = 0;
+  int absolute = 0, maximum = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    absolute = abs((int)vector[i]);
+
+    if (absolute > maximum) {
+      maximum = absolute;
+    }
+  }
+
+  // Guard the case for abs(-32768).
+  if (maximum > WEBRTC_SPL_WORD16_MAX) {
+    maximum = WEBRTC_SPL_WORD16_MAX;
+  }
+
+  return (int16_t)maximum;
+}
+
+// Maximum absolute value of word32 vector. C version for generic platforms.
+int32_t WebRtcSpl_MaxAbsValueW32C(const int32_t* vector, size_t length) {
+  // Use uint32_t for the local variables, to accommodate the return value
+  // of abs(0x80000000), which is 0x80000000.
+
+  uint32_t absolute = 0, maximum = 0;
+  size_t i = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    absolute =
+        (vector[i] != INT_MIN) ? abs((int)vector[i]) : INT_MAX + (uint32_t)1;
+    if (absolute > maximum) {
+      maximum = absolute;
+    }
+  }
+
+  maximum = WEBRTC_SPL_MIN(maximum, WEBRTC_SPL_WORD32_MAX);
+
+  return (int32_t)maximum;
+}
+
+// Maximum value of word16 vector. C version for generic platforms.
+int16_t WebRtcSpl_MaxValueW16C(const int16_t* vector, size_t length) {
+  int16_t maximum = WEBRTC_SPL_WORD16_MIN;
+  size_t i = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] > maximum)
+      maximum = vector[i];
+  }
+  return maximum;
+}
+
+// Maximum value of word32 vector. C version for generic platforms.
+int32_t WebRtcSpl_MaxValueW32C(const int32_t* vector, size_t length) {
+  int32_t maximum = WEBRTC_SPL_WORD32_MIN;
+  size_t i = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] > maximum)
+      maximum = vector[i];
+  }
+  return maximum;
+}
+
+// Minimum value of word16 vector. C version for generic platforms.
+int16_t WebRtcSpl_MinValueW16C(const int16_t* vector, size_t length) {
+  int16_t minimum = WEBRTC_SPL_WORD16_MAX;
+  size_t i = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] < minimum)
+      minimum = vector[i];
+  }
+  return minimum;
+}
+
+// Minimum value of word32 vector. C version for generic platforms.
+int32_t WebRtcSpl_MinValueW32C(const int32_t* vector, size_t length) {
+  int32_t minimum = WEBRTC_SPL_WORD32_MAX;
+  size_t i = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] < minimum)
+      minimum = vector[i];
+  }
+  return minimum;
+}
+
+// Index of maximum absolute value in a word16 vector.
+size_t WebRtcSpl_MaxAbsIndexW16(const int16_t* vector, size_t length) {
+  // Use type int for local variables, to accomodate the value of abs(-32768).
+
+  size_t i = 0, index = 0;
+  int absolute = 0, maximum = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    absolute = abs((int)vector[i]);
+
+    if (absolute > maximum) {
+      maximum = absolute;
+      index = i;
+    }
+  }
+
+  return index;
+}
+
+int16_t WebRtcSpl_MaxAbsElementW16(const int16_t* vector, size_t length) {
+  int16_t min_val, max_val;
+  WebRtcSpl_MinMaxW16(vector, length, &min_val, &max_val);
+  if (min_val == max_val || min_val < -max_val) {
+    return min_val;
+  }
+  return max_val;
+}
+
+// Index of maximum value in a word16 vector.
+size_t WebRtcSpl_MaxIndexW16(const int16_t* vector, size_t length) {
+  size_t i = 0, index = 0;
+  int16_t maximum = WEBRTC_SPL_WORD16_MIN;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] > maximum) {
+      maximum = vector[i];
+      index = i;
+    }
+  }
+
+  return index;
+}
+
+// Index of maximum value in a word32 vector.
+size_t WebRtcSpl_MaxIndexW32(const int32_t* vector, size_t length) {
+  size_t i = 0, index = 0;
+  int32_t maximum = WEBRTC_SPL_WORD32_MIN;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] > maximum) {
+      maximum = vector[i];
+      index = i;
+    }
+  }
+
+  return index;
+}
+
+// Index of minimum value in a word16 vector.
+size_t WebRtcSpl_MinIndexW16(const int16_t* vector, size_t length) {
+  size_t i = 0, index = 0;
+  int16_t minimum = WEBRTC_SPL_WORD16_MAX;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] < minimum) {
+      minimum = vector[i];
+      index = i;
+    }
+  }
+
+  return index;
+}
+
+// Index of minimum value in a word32 vector.
+size_t WebRtcSpl_MinIndexW32(const int32_t* vector, size_t length) {
+  size_t i = 0, index = 0;
+  int32_t minimum = WEBRTC_SPL_WORD32_MAX;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] < minimum) {
+      minimum = vector[i];
+      index = i;
+    }
+  }
+
+  return index;
+}
+
+// Finds both the minimum and maximum elements in an array of 16-bit integers.
+void WebRtcSpl_MinMaxW16(const int16_t* vector, size_t length,
+                         int16_t* min_val, int16_t* max_val) {
+#if defined(WEBRTC_HAS_NEON)
+  return WebRtcSpl_MinMaxW16Neon(vector, length, min_val, max_val);
+#else
+  int16_t minimum = WEBRTC_SPL_WORD16_MAX;
+  int16_t maximum = WEBRTC_SPL_WORD16_MIN;
+  size_t i = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  for (i = 0; i < length; i++) {
+    if (vector[i] < minimum)
+      minimum = vector[i];
+    if (vector[i] > maximum)
+      maximum = vector[i];
+  }
+  *min_val = minimum;
+  *max_val = maximum;
+#endif
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_mips.c b/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_mips.c
new file mode 100644
index 0000000000..8a7fc65c42
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_mips.c
@@ -0,0 +1,375 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This file contains the implementation of function
+ * WebRtcSpl_MaxAbsValueW16()
+ *
+ * The description header can be found in signal_processing_library.h.
+ *
+ */
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// Maximum absolute value of word16 vector.
+int16_t WebRtcSpl_MaxAbsValueW16_mips(const int16_t* vector, size_t length) {
+  int32_t totMax = 0;
+  int32_t tmp32_0, tmp32_1, tmp32_2, tmp32_3;
+  size_t i, loop_size;
+
+  RTC_DCHECK_GT(length, 0);
+
+#if defined(MIPS_DSP_R1)
+  const int32_t* tmpvec32 = (int32_t*)vector;
+  loop_size = length >> 4;
+
+  for (i = 0; i < loop_size; i++) {
+    __asm__ volatile (
+      "lw         %[tmp32_0],     0(%[tmpvec32])              \n\t"
+      "lw         %[tmp32_1],     4(%[tmpvec32])              \n\t"
+      "lw         %[tmp32_2],     8(%[tmpvec32])              \n\t"
+      "lw         %[tmp32_3],     12(%[tmpvec32])             \n\t"
+
+      "absq_s.ph  %[tmp32_0],     %[tmp32_0]                  \n\t"
+      "absq_s.ph  %[tmp32_1],     %[tmp32_1]                  \n\t"
+      "cmp.lt.ph  %[totMax],      %[tmp32_0]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_0],     %[totMax]   \n\t"
+
+      "lw         %[tmp32_0],     16(%[tmpvec32])             \n\t"
+      "absq_s.ph  %[tmp32_2],     %[tmp32_2]                  \n\t"
+      "cmp.lt.ph  %[totMax],      %[tmp32_1]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_1],     %[totMax]   \n\t"
+
+      "lw         %[tmp32_1],     20(%[tmpvec32])             \n\t"
+      "absq_s.ph  %[tmp32_3],     %[tmp32_3]                  \n\t"
+      "cmp.lt.ph  %[totMax],      %[tmp32_2]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_2],     %[totMax]   \n\t"
+
+      "lw         %[tmp32_2],     24(%[tmpvec32])             \n\t"
+      "cmp.lt.ph  %[totMax],      %[tmp32_3]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_3],     %[totMax]   \n\t"
+
+      "lw         %[tmp32_3],     28(%[tmpvec32])             \n\t"
+      "absq_s.ph  %[tmp32_0],     %[tmp32_0]                  \n\t"
+      "absq_s.ph  %[tmp32_1],     %[tmp32_1]                  \n\t"
+      "cmp.lt.ph  %[totMax],      %[tmp32_0]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_0],     %[totMax]   \n\t"
+
+      "absq_s.ph  %[tmp32_2],     %[tmp32_2]                  \n\t"
+      "cmp.lt.ph  %[totMax],      %[tmp32_1]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_1],     %[totMax]   \n\t"
+      "absq_s.ph  %[tmp32_3],     %[tmp32_3]                  \n\t"
+      "cmp.lt.ph  %[totMax],      %[tmp32_2]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_2],     %[totMax]   \n\t"
+
+      "cmp.lt.ph  %[totMax],      %[tmp32_3]                  \n\t"
+      "pick.ph    %[totMax],      %[tmp32_3],     %[totMax]   \n\t"
+
+      "addiu      %[tmpvec32],    %[tmpvec32],    32          \n\t"
+      : [tmp32_0] "=&r" (tmp32_0), [tmp32_1] "=&r" (tmp32_1),
+        [tmp32_2] "=&r" (tmp32_2), [tmp32_3] "=&r" (tmp32_3),
+        [totMax] "+r" (totMax), [tmpvec32] "+r" (tmpvec32)
+      :
+      : "memory"
+    );
+  }
+  __asm__ volatile (
+    "rotr       %[tmp32_0],     %[totMax],      16          \n\t"
+    "cmp.lt.ph  %[totMax],      %[tmp32_0]                  \n\t"
+    "pick.ph    %[totMax],      %[tmp32_0],     %[totMax]   \n\t"
+    "packrl.ph  %[totMax],      $0,             %[totMax]   \n\t"
+    : [tmp32_0] "=&r" (tmp32_0), [totMax] "+r" (totMax)
+    :
+  );
+  loop_size = length & 0xf;
+  for (i = 0; i < loop_size; i++) {
+    __asm__ volatile (
+      "lh         %[tmp32_0],     0(%[tmpvec32])              \n\t"
+      "addiu      %[tmpvec32],    %[tmpvec32],     2          \n\t"
+      "absq_s.w   %[tmp32_0],     %[tmp32_0]                  \n\t"
+      "slt        %[tmp32_1],     %[totMax],       %[tmp32_0] \n\t"
+      "movn       %[totMax],      %[tmp32_0],      %[tmp32_1] \n\t"
+      : [tmp32_0] "=&r" (tmp32_0), [tmp32_1] "=&r" (tmp32_1),
+        [tmpvec32] "+r" (tmpvec32), [totMax] "+r" (totMax)
+      :
+      : "memory"
+    );
+  }
+#else  // #if defined(MIPS_DSP_R1)
+  int32_t v16MaxMax = WEBRTC_SPL_WORD16_MAX;
+  int32_t r, r1, r2, r3;
+  const int16_t* tmpvector = vector;
+  loop_size = length >> 4;
+  for (i = 0; i < loop_size; i++) {
+    __asm__ volatile (
+      "lh     %[tmp32_0],     0(%[tmpvector])                 \n\t"
+      "lh     %[tmp32_1],     2(%[tmpvector])                 \n\t"
+      "lh     %[tmp32_2],     4(%[tmpvector])                 \n\t"
+      "lh     %[tmp32_3],     6(%[tmpvector])                 \n\t"
+
+      "abs    %[tmp32_0],     %[tmp32_0]                      \n\t"
+      "abs    %[tmp32_1],     %[tmp32_1]                      \n\t"
+      "abs    %[tmp32_2],     %[tmp32_2]                      \n\t"
+      "abs    %[tmp32_3],     %[tmp32_3]                      \n\t"
+
+      "slt    %[r],           %[totMax],      %[tmp32_0]      \n\t"
+      "movn   %[totMax],      %[tmp32_0],     %[r]            \n\t"
+      "slt    %[r1],          %[totMax],      %[tmp32_1]      \n\t"
+      "movn   %[totMax],      %[tmp32_1],     %[r1]           \n\t"
+      "slt    %[r2],          %[totMax],      %[tmp32_2]      \n\t"
+      "movn   %[totMax],      %[tmp32_2],     %[r2]           \n\t"
+      "slt    %[r3],          %[totMax],      %[tmp32_3]      \n\t"
+      "movn   %[totMax],      %[tmp32_3],     %[r3]           \n\t"
+
+      "lh     %[tmp32_0],     8(%[tmpvector])                 \n\t"
+      "lh     %[tmp32_1],     10(%[tmpvector])                \n\t"
+      "lh     %[tmp32_2],     12(%[tmpvector])                \n\t"
+      "lh     %[tmp32_3],     14(%[tmpvector])                \n\t"
+
+      "abs    %[tmp32_0],     %[tmp32_0]                      \n\t"
+      "abs    %[tmp32_1],     %[tmp32_1]                      \n\t"
+      "abs    %[tmp32_2],     %[tmp32_2]                      \n\t"
+      "abs    %[tmp32_3],     %[tmp32_3]                      \n\t"
+
+      "slt    %[r],           %[totMax],      %[tmp32_0]      \n\t"
+      "movn   %[totMax],      %[tmp32_0],     %[r]            \n\t"
+      "slt    %[r1],          %[totMax],      %[tmp32_1]      \n\t"
+      "movn   %[totMax],      %[tmp32_1],     %[r1]           \n\t"
+      "slt    %[r2],          %[totMax],      %[tmp32_2]      \n\t"
+      "movn   %[totMax],      %[tmp32_2],     %[r2]           \n\t"
+      "slt    %[r3],          %[totMax],      %[tmp32_3]      \n\t"
+      "movn   %[totMax],      %[tmp32_3],     %[r3]           \n\t"
+
+      "lh     %[tmp32_0],     16(%[tmpvector])                \n\t"
+      "lh     %[tmp32_1],     18(%[tmpvector])                \n\t"
+      "lh     %[tmp32_2],     20(%[tmpvector])                \n\t"
+      "lh     %[tmp32_3],     22(%[tmpvector])                \n\t"
+
+      "abs    %[tmp32_0],     %[tmp32_0]                      \n\t"
+      "abs    %[tmp32_1],     %[tmp32_1]                      \n\t"
+      "abs    %[tmp32_2],     %[tmp32_2]                      \n\t"
+      "abs    %[tmp32_3],     %[tmp32_3]                      \n\t"
+
+      "slt    %[r],           %[totMax],      %[tmp32_0]      \n\t"
+      "movn   %[totMax],      %[tmp32_0],     %[r]            \n\t"
+      "slt    %[r1],          %[totMax],      %[tmp32_1]      \n\t"
+      "movn   %[totMax],      %[tmp32_1],     %[r1]           \n\t"
+      "slt    %[r2],          %[totMax],      %[tmp32_2]      \n\t"
+      "movn   %[totMax],      %[tmp32_2],     %[r2]           \n\t"
+      "slt    %[r3],          %[totMax],      %[tmp32_3]      \n\t"
+      "movn   %[totMax],      %[tmp32_3],     %[r3]           \n\t"
+
+      "lh     %[tmp32_0],     24(%[tmpvector])                \n\t"
+      "lh     %[tmp32_1],     26(%[tmpvector])                \n\t"
+      "lh     %[tmp32_2],     28(%[tmpvector])                \n\t"
+      "lh     %[tmp32_3],     30(%[tmpvector])                \n\t"
+
+      "abs    %[tmp32_0],     %[tmp32_0]                      \n\t"
+      "abs    %[tmp32_1],     %[tmp32_1]                      \n\t"
+      "abs    %[tmp32_2],     %[tmp32_2]                      \n\t"
+      "abs    %[tmp32_3],     %[tmp32_3]                      \n\t"
+
+      "slt    %[r],           %[totMax],      %[tmp32_0]      \n\t"
+      "movn   %[totMax],      %[tmp32_0],     %[r]            \n\t"
+      "slt    %[r1],          %[totMax],      %[tmp32_1]      \n\t"
+      "movn   %[totMax],      %[tmp32_1],     %[r1]           \n\t"
+      "slt    %[r2],          %[totMax],      %[tmp32_2]      \n\t"
+      "movn   %[totMax],      %[tmp32_2],     %[r2]           \n\t"
+      "slt    %[r3],          %[totMax],      %[tmp32_3]      \n\t"
+      "movn   %[totMax],      %[tmp32_3],     %[r3]           \n\t"
+
+      "addiu  %[tmpvector],   %[tmpvector],   32              \n\t"
+      : [tmp32_0] "=&r" (tmp32_0), [tmp32_1] "=&r" (tmp32_1),
+        [tmp32_2] "=&r" (tmp32_2), [tmp32_3] "=&r" (tmp32_3),
+        [totMax] "+r" (totMax), [r] "=&r" (r), [tmpvector] "+r" (tmpvector),
+        [r1] "=&r" (r1), [r2] "=&r" (r2), [r3] "=&r" (r3)
+      :
+      : "memory"
+    );
+  }
+  loop_size = length & 0xf;
+  for (i = 0; i < loop_size; i++) {
+    __asm__ volatile (
+      "lh         %[tmp32_0],     0(%[tmpvector])             \n\t"
+      "addiu      %[tmpvector],   %[tmpvector],    2          \n\t"
+      "abs        %[tmp32_0],     %[tmp32_0]                  \n\t"
+      "slt        %[tmp32_1],     %[totMax],       %[tmp32_0] \n\t"
+      "movn       %[totMax],      %[tmp32_0],      %[tmp32_1] \n\t"
+      : [tmp32_0] "=&r" (tmp32_0), [tmp32_1] "=&r" (tmp32_1),
+        [tmpvector] "+r" (tmpvector), [totMax] "+r" (totMax)
+      :
+      : "memory"
+    );
+  }
+
+  __asm__ volatile (
+    "slt    %[r],       %[v16MaxMax],   %[totMax]   \n\t"
+    "movn   %[totMax],  %[v16MaxMax],   %[r]        \n\t"
+    : [totMax] "+r" (totMax), [r] "=&r" (r)
+    : [v16MaxMax] "r" (v16MaxMax)
+  );
+#endif  // #if defined(MIPS_DSP_R1)
+  return (int16_t)totMax;
+}
+
+#if defined(MIPS_DSP_R1_LE)
+// Maximum absolute value of word32 vector. Version for MIPS platform.
+int32_t WebRtcSpl_MaxAbsValueW32_mips(const int32_t* vector, size_t length) {
+  // Use uint32_t for the local variables, to accommodate the return value
+  // of abs(0x80000000), which is 0x80000000.
+
+  uint32_t absolute = 0, maximum = 0;
+  int tmp1 = 0, max_value = 0x7fffffff;
+
+  RTC_DCHECK_GT(length, 0);
+
+  __asm__ volatile (
+    ".set push                                                        \n\t"
+    ".set noreorder                                                   \n\t"
+
+   "1:                                                                \n\t"
+    "lw         %[absolute],      0(%[vector])                        \n\t"
+    "absq_s.w   %[absolute],      %[absolute]                         \n\t"
+    "addiu      %[length],        %[length],          -1              \n\t"
+    "slt        %[tmp1],          %[maximum],         %[absolute]     \n\t"
+    "movn       %[maximum],       %[absolute],        %[tmp1]         \n\t"
+    "bgtz       %[length],        1b                                  \n\t"
+    " addiu     %[vector],        %[vector],          4               \n\t"
+    "slt        %[tmp1],          %[max_value],       %[maximum]      \n\t"
+    "movn       %[maximum],       %[max_value],       %[tmp1]         \n\t"
+
+    ".set pop                                                         \n\t"
+
+    : [tmp1] "=&r" (tmp1), [maximum] "+r" (maximum), [absolute] "+r" (absolute)
+    : [vector] "r" (vector), [length] "r" (length), [max_value] "r" (max_value)
+    : "memory"
+  );
+
+  return (int32_t)maximum;
+}
+#endif  // #if defined(MIPS_DSP_R1_LE)
+
+// Maximum value of word16 vector. Version for MIPS platform.
+int16_t WebRtcSpl_MaxValueW16_mips(const int16_t* vector, size_t length) {
+  int16_t maximum = WEBRTC_SPL_WORD16_MIN;
+  int tmp1;
+  int16_t value;
+
+  RTC_DCHECK_GT(length, 0);
+
+  __asm__ volatile (
+    ".set push                                                        \n\t"
+    ".set noreorder                                                   \n\t"
+
+   "1:                                                                \n\t"
+    "lh         %[value],         0(%[vector])                        \n\t"
+    "addiu      %[length],        %[length],          -1              \n\t"
+    "slt        %[tmp1],          %[maximum],         %[value]        \n\t"
+    "movn       %[maximum],       %[value],           %[tmp1]         \n\t"
+    "bgtz       %[length],        1b                                  \n\t"
+    " addiu     %[vector],        %[vector],          2               \n\t"
+    ".set pop                                                         \n\t"
+
+    : [tmp1] "=&r" (tmp1), [maximum] "+r" (maximum), [value] "=&r" (value)
+    : [vector] "r" (vector), [length] "r" (length)
+    : "memory"
+  );
+
+  return maximum;
+}
+
+// Maximum value of word32 vector. Version for MIPS platform.
+int32_t WebRtcSpl_MaxValueW32_mips(const int32_t* vector, size_t length) {
+  int32_t maximum = WEBRTC_SPL_WORD32_MIN;
+  int tmp1, value;
+
+  RTC_DCHECK_GT(length, 0);
+
+  __asm__ volatile (
+    ".set push                                                        \n\t"
+    ".set noreorder                                                   \n\t"
+
+   "1:                                                                \n\t"
+    "lw         %[value],         0(%[vector])                        \n\t"
+    "addiu      %[length],        %[length],          -1              \n\t"
+    "slt        %[tmp1],          %[maximum],         %[value]        \n\t"
+    "movn       %[maximum],       %[value],           %[tmp1]         \n\t"
+    "bgtz       %[length],        1b                                  \n\t"
+    " addiu     %[vector],        %[vector],          4               \n\t"
+
+    ".set pop                                                         \n\t"
+
+    : [tmp1] "=&r" (tmp1), [maximum] "+r" (maximum), [value] "=&r" (value)
+    : [vector] "r" (vector), [length] "r" (length)
+    : "memory"
+  );
+
+  return maximum;
+}
+
+// Minimum value of word16 vector. Version for MIPS platform.
+int16_t WebRtcSpl_MinValueW16_mips(const int16_t* vector, size_t length) {
+  int16_t minimum = WEBRTC_SPL_WORD16_MAX;
+  int tmp1;
+  int16_t value;
+
+  RTC_DCHECK_GT(length, 0);
+
+  __asm__ volatile (
+    ".set push                                                        \n\t"
+    ".set noreorder                                                   \n\t"
+
+   "1:                                                                \n\t"
+    "lh         %[value],         0(%[vector])                        \n\t"
+    "addiu      %[length],        %[length],          -1              \n\t"
+    "slt        %[tmp1],          %[value],           %[minimum]      \n\t"
+    "movn       %[minimum],       %[value],           %[tmp1]         \n\t"
+    "bgtz       %[length],        1b                                  \n\t"
+    " addiu     %[vector],        %[vector],          2               \n\t"
+
+    ".set pop                                                         \n\t"
+
+    : [tmp1] "=&r" (tmp1), [minimum] "+r" (minimum), [value] "=&r" (value)
+    : [vector] "r" (vector), [length] "r" (length)
+    : "memory"
+  );
+
+  return minimum;
+}
+
+// Minimum value of word32 vector. Version for MIPS platform.
+int32_t WebRtcSpl_MinValueW32_mips(const int32_t* vector, size_t length) {
+  int32_t minimum = WEBRTC_SPL_WORD32_MAX;
+  int tmp1, value;
+
+  RTC_DCHECK_GT(length, 0);
+
+  __asm__ volatile (
+    ".set push                                                        \n\t"
+    ".set noreorder                                                   \n\t"
+
+   "1:                                                                \n\t"
+    "lw         %[value],         0(%[vector])                        \n\t"
+    "addiu      %[length],        %[length],          -1              \n\t"
+    "slt        %[tmp1],          %[value],           %[minimum]      \n\t"
+    "movn       %[minimum],       %[value],           %[tmp1]         \n\t"
+    "bgtz       %[length],        1b                                  \n\t"
+    " addiu     %[vector],        %[vector],          4               \n\t"
+
+    ".set pop                                                         \n\t"
+
+    : [tmp1] "=&r" (tmp1), [minimum] "+r" (minimum), [value] "=&r" (value)
+    : [vector] "r" (vector), [length] "r" (length)
+    : "memory"
+  );
+
+  return minimum;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_neon.c b/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_neon.c
new file mode 100644
index 0000000000..e5b4b7c71b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/min_max_operations_neon.c
@@ -0,0 +1,333 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <arm_neon.h>
+#include <stdlib.h>
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// Maximum absolute value of word16 vector. C version for generic platforms.
+int16_t WebRtcSpl_MaxAbsValueW16Neon(const int16_t* vector, size_t length) {
+  int absolute = 0, maximum = 0;
+
+  RTC_DCHECK_GT(length, 0);
+
+  const int16_t* p_start = vector;
+  size_t rest = length & 7;
+  const int16_t* p_end = vector + length - rest;
+
+  int16x8_t v;
+  uint16x8_t max_qv;
+  max_qv = vdupq_n_u16(0);
+
+  while (p_start < p_end) {
+    v = vld1q_s16(p_start);
+    // Note vabs doesn't change the value of -32768.
+    v = vabsq_s16(v);
+    // Use u16 so we don't lose the value -32768.
+    max_qv = vmaxq_u16(max_qv, vreinterpretq_u16_s16(v));
+    p_start += 8;
+  }
+
+#ifdef WEBRTC_ARCH_ARM64
+  maximum = (int)vmaxvq_u16(max_qv);
+#else
+  uint16x4_t max_dv;
+  max_dv = vmax_u16(vget_low_u16(max_qv), vget_high_u16(max_qv));
+  max_dv = vpmax_u16(max_dv, max_dv);
+  max_dv = vpmax_u16(max_dv, max_dv);
+
+  maximum = (int)vget_lane_u16(max_dv, 0);
+#endif
+
+  p_end = vector + length;
+  while (p_start < p_end) {
+    absolute = abs((int)(*p_start));
+
+    if (absolute > maximum) {
+      maximum = absolute;
+    }
+    p_start++;
+  }
+
+  // Guard the case for abs(-32768).
+  if (maximum > WEBRTC_SPL_WORD16_MAX) {
+    maximum = WEBRTC_SPL_WORD16_MAX;
+  }
+
+  return (int16_t)maximum;
+}
+
+// Maximum absolute value of word32 vector. NEON intrinsics version for
+// ARM 32-bit/64-bit platforms.
+int32_t WebRtcSpl_MaxAbsValueW32Neon(const int32_t* vector, size_t length) {
+  // Use uint32_t for the local variables, to accommodate the return value
+  // of abs(0x80000000), which is 0x80000000.
+
+  uint32_t absolute = 0, maximum = 0;
+  size_t i = 0;
+  size_t residual = length & 0x7;
+
+  RTC_DCHECK_GT(length, 0);
+
+  const int32_t* p_start = vector;
+  uint32x4_t max32x4_0 = vdupq_n_u32(0);
+  uint32x4_t max32x4_1 = vdupq_n_u32(0);
+
+  // First part, unroll the loop 8 times.
+  for (i = 0; i < length - residual; i += 8) {
+    int32x4_t in32x4_0 = vld1q_s32(p_start);
+    p_start += 4;
+    int32x4_t in32x4_1 = vld1q_s32(p_start);
+    p_start += 4;
+    in32x4_0 = vabsq_s32(in32x4_0);
+    in32x4_1 = vabsq_s32(in32x4_1);
+    // vabs doesn't change the value of 0x80000000.
+    // Use u32 so we don't lose the value 0x80000000.
+    max32x4_0 = vmaxq_u32(max32x4_0, vreinterpretq_u32_s32(in32x4_0));
+    max32x4_1 = vmaxq_u32(max32x4_1, vreinterpretq_u32_s32(in32x4_1));
+  }
+
+  uint32x4_t max32x4 = vmaxq_u32(max32x4_0, max32x4_1);
+#if defined(WEBRTC_ARCH_ARM64)
+  maximum = vmaxvq_u32(max32x4);
+#else
+  uint32x2_t max32x2 = vmax_u32(vget_low_u32(max32x4), vget_high_u32(max32x4));
+  max32x2 = vpmax_u32(max32x2, max32x2);
+
+  maximum = vget_lane_u32(max32x2, 0);
+#endif
+
+  // Second part, do the remaining iterations (if any).
+  for (i = residual; i > 0; i--) {
+    absolute = abs((int)(*p_start));
+    if (absolute > maximum) {
+      maximum = absolute;
+    }
+    p_start++;
+  }
+
+  // Guard against the case for 0x80000000.
+  maximum = WEBRTC_SPL_MIN(maximum, WEBRTC_SPL_WORD32_MAX);
+
+  return (int32_t)maximum;
+}
+
+// Maximum value of word16 vector. NEON intrinsics version for
+// ARM 32-bit/64-bit platforms.
+int16_t WebRtcSpl_MaxValueW16Neon(const int16_t* vector, size_t length) {
+  int16_t maximum = WEBRTC_SPL_WORD16_MIN;
+  size_t i = 0;
+  size_t residual = length & 0x7;
+
+  RTC_DCHECK_GT(length, 0);
+
+  const int16_t* p_start = vector;
+  int16x8_t max16x8 = vdupq_n_s16(WEBRTC_SPL_WORD16_MIN);
+
+  // First part, unroll the loop 8 times.
+  for (i = 0; i < length - residual; i += 8) {
+    int16x8_t in16x8 = vld1q_s16(p_start);
+    max16x8 = vmaxq_s16(max16x8, in16x8);
+    p_start += 8;
+  }
+
+#if defined(WEBRTC_ARCH_ARM64)
+  maximum = vmaxvq_s16(max16x8);
+#else
+  int16x4_t max16x4 = vmax_s16(vget_low_s16(max16x8), vget_high_s16(max16x8));
+  max16x4 = vpmax_s16(max16x4, max16x4);
+  max16x4 = vpmax_s16(max16x4, max16x4);
+
+  maximum = vget_lane_s16(max16x4, 0);
+#endif
+
+  // Second part, do the remaining iterations (if any).
+  for (i = residual; i > 0; i--) {
+    if (*p_start > maximum)
+      maximum = *p_start;
+    p_start++;
+  }
+  return maximum;
+}
+
+// Maximum value of word32 vector. NEON intrinsics version for
+// ARM 32-bit/64-bit platforms.
+int32_t WebRtcSpl_MaxValueW32Neon(const int32_t* vector, size_t length) {
+  int32_t maximum = WEBRTC_SPL_WORD32_MIN;
+  size_t i = 0;
+  size_t residual = length & 0x7;
+
+  RTC_DCHECK_GT(length, 0);
+
+  const int32_t* p_start = vector;
+  int32x4_t max32x4_0 = vdupq_n_s32(WEBRTC_SPL_WORD32_MIN);
+  int32x4_t max32x4_1 = vdupq_n_s32(WEBRTC_SPL_WORD32_MIN);
+
+  // First part, unroll the loop 8 times.
+  for (i = 0; i < length - residual; i += 8) {
+    int32x4_t in32x4_0 = vld1q_s32(p_start);
+    p_start += 4;
+    int32x4_t in32x4_1 = vld1q_s32(p_start);
+    p_start += 4;
+    max32x4_0 = vmaxq_s32(max32x4_0, in32x4_0);
+    max32x4_1 = vmaxq_s32(max32x4_1, in32x4_1);
+  }
+
+  int32x4_t max32x4 = vmaxq_s32(max32x4_0, max32x4_1);
+#if defined(WEBRTC_ARCH_ARM64)
+  maximum = vmaxvq_s32(max32x4);
+#else
+  int32x2_t max32x2 = vmax_s32(vget_low_s32(max32x4), vget_high_s32(max32x4));
+  max32x2 = vpmax_s32(max32x2, max32x2);
+
+  maximum = vget_lane_s32(max32x2, 0);
+#endif
+
+  // Second part, do the remaining iterations (if any).
+  for (i = residual; i > 0; i--) {
+    if (*p_start > maximum)
+      maximum = *p_start;
+    p_start++;
+  }
+  return maximum;
+}
+
+// Minimum value of word16 vector. NEON intrinsics version for
+// ARM 32-bit/64-bit platforms.
+int16_t WebRtcSpl_MinValueW16Neon(const int16_t* vector, size_t length) {
+  int16_t minimum = WEBRTC_SPL_WORD16_MAX;
+  size_t i = 0;
+  size_t residual = length & 0x7;
+
+  RTC_DCHECK_GT(length, 0);
+
+  const int16_t* p_start = vector;
+  int16x8_t min16x8 = vdupq_n_s16(WEBRTC_SPL_WORD16_MAX);
+
+  // First part, unroll the loop 8 times.
+  for (i = 0; i < length - residual; i += 8) {
+    int16x8_t in16x8 = vld1q_s16(p_start);
+    min16x8 = vminq_s16(min16x8, in16x8);
+    p_start += 8;
+  }
+
+#if defined(WEBRTC_ARCH_ARM64)
+  minimum = vminvq_s16(min16x8);
+#else
+  int16x4_t min16x4 = vmin_s16(vget_low_s16(min16x8), vget_high_s16(min16x8));
+  min16x4 = vpmin_s16(min16x4, min16x4);
+  min16x4 = vpmin_s16(min16x4, min16x4);
+
+  minimum = vget_lane_s16(min16x4, 0);
+#endif
+
+  // Second part, do the remaining iterations (if any).
+  for (i = residual; i > 0; i--) {
+    if (*p_start < minimum)
+      minimum = *p_start;
+    p_start++;
+  }
+  return minimum;
+}
+
+// Minimum value of word32 vector. NEON intrinsics version for
+// ARM 32-bit/64-bit platforms.
+int32_t WebRtcSpl_MinValueW32Neon(const int32_t* vector, size_t length) {
+  int32_t minimum = WEBRTC_SPL_WORD32_MAX;
+  size_t i = 0;
+  size_t residual = length & 0x7;
+
+  RTC_DCHECK_GT(length, 0);
+
+  const int32_t* p_start = vector;
+  int32x4_t min32x4_0 = vdupq_n_s32(WEBRTC_SPL_WORD32_MAX);
+  int32x4_t min32x4_1 = vdupq_n_s32(WEBRTC_SPL_WORD32_MAX);
+
+  // First part, unroll the loop 8 times.
+  for (i = 0; i < length - residual; i += 8) {
+    int32x4_t in32x4_0 = vld1q_s32(p_start);
+    p_start += 4;
+    int32x4_t in32x4_1 = vld1q_s32(p_start);
+    p_start += 4;
+    min32x4_0 = vminq_s32(min32x4_0, in32x4_0);
+    min32x4_1 = vminq_s32(min32x4_1, in32x4_1);
+  }
+
+  int32x4_t min32x4 = vminq_s32(min32x4_0, min32x4_1);
+#if defined(WEBRTC_ARCH_ARM64)
+  minimum = vminvq_s32(min32x4);
+#else
+  int32x2_t min32x2 = vmin_s32(vget_low_s32(min32x4), vget_high_s32(min32x4));
+  min32x2 = vpmin_s32(min32x2, min32x2);
+
+  minimum = vget_lane_s32(min32x2, 0);
+#endif
+
+  // Second part, do the remaining iterations (if any).
+  for (i = residual; i > 0; i--) {
+    if (*p_start < minimum)
+      minimum = *p_start;
+    p_start++;
+  }
+  return minimum;
+}
+
+// Finds both the minimum and maximum elements in an array of 16-bit integers.
+void WebRtcSpl_MinMaxW16Neon(const int16_t* vector, size_t length,
+                             int16_t* min_val, int16_t* max_val) {
+  int16_t minimum = WEBRTC_SPL_WORD16_MAX;
+  int16_t maximum = WEBRTC_SPL_WORD16_MIN;
+  size_t i = 0;
+  size_t residual = length & 0x7;
+
+  RTC_DCHECK_GT(length, 0);
+
+  const int16_t* p_start = vector;
+  int16x8_t min16x8 = vdupq_n_s16(WEBRTC_SPL_WORD16_MAX);
+  int16x8_t max16x8 = vdupq_n_s16(WEBRTC_SPL_WORD16_MIN);
+
+  // First part, unroll the loop 8 times.
+  for (i = 0; i < length - residual; i += 8) {
+    int16x8_t in16x8 = vld1q_s16(p_start);
+    min16x8 = vminq_s16(min16x8, in16x8);
+    max16x8 = vmaxq_s16(max16x8, in16x8);
+    p_start += 8;
+  }
+
+#if defined(WEBRTC_ARCH_ARM64)
+  minimum = vminvq_s16(min16x8);
+  maximum = vmaxvq_s16(max16x8);
+#else
+  int16x4_t min16x4 = vmin_s16(vget_low_s16(min16x8), vget_high_s16(min16x8));
+  min16x4 = vpmin_s16(min16x4, min16x4);
+  min16x4 = vpmin_s16(min16x4, min16x4);
+
+  minimum = vget_lane_s16(min16x4, 0);
+
+  int16x4_t max16x4 = vmax_s16(vget_low_s16(max16x8), vget_high_s16(max16x8));
+  max16x4 = vpmax_s16(max16x4, max16x4);
+  max16x4 = vpmax_s16(max16x4, max16x4);
+
+  maximum = vget_lane_s16(max16x4, 0);
+#endif
+
+  // Second part, do the remaining iterations (if any).
+  for (i = residual; i > 0; i--) {
+    if (*p_start < minimum)
+      minimum = *p_start;
+    if (*p_start > maximum)
+      maximum = *p_start;
+    p_start++;
+  }
+  *min_val = minimum;
+  *max_val = maximum;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/randomization_functions.c b/third_party/libwebrtc/common_audio/signal_processing/randomization_functions.c
new file mode 100644
index 0000000000..a445c572c7
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/randomization_functions.c
@@ -0,0 +1,115 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains implementations of the randomization functions
+ * WebRtcSpl_RandU()
+ * WebRtcSpl_RandN()
+ * WebRtcSpl_RandUArray()
+ *
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+static const uint32_t kMaxSeedUsed = 0x80000000;
+
+static const int16_t kRandNTable[] = {
+    9178,    -7260,       40,    10189,     4894,    -3531,   -13779,    14764,
+   -4008,    -8884,    -8990,     1008,     7368,     5184,     3251,    -5817,
+   -9786,     5963,     1770,     8066,    -7135,    10772,    -2298,     1361,
+    6484,     2241,    -8633,      792,      199,    -3344,     6553,   -10079,
+  -15040,       95,    11608,   -12469,    14161,    -4176,     2476,     6403,
+   13685,   -16005,     6646,     2239,    10916,    -3004,     -602,    -3141,
+    2142,    14144,    -5829,     5305,     8209,     4713,     2697,    -5112,
+   16092,    -1210,    -2891,    -6631,    -5360,   -11878,    -6781,    -2739,
+   -6392,      536,    10923,    10872,     5059,    -4748,    -7770,     5477,
+      38,    -1025,    -2892,     1638,     6304,    14375,   -11028,     1553,
+   -1565,    10762,     -393,     4040,     5257,    12310,     6554,    -4799,
+    4899,    -6354,     1603,    -1048,    -2220,     8247,     -186,    -8944,
+  -12004,     2332,     4801,    -4933,     6371,      131,     8614,    -5927,
+   -8287,   -22760,     4033,   -15162,     3385,     3246,     3153,    -5250,
+    3766,      784,     6494,      -62,     3531,    -1582,    15572,      662,
+   -3952,     -330,    -3196,      669,     7236,    -2678,    -6569,    23319,
+   -8645,     -741,    14830,   -15976,     4903,      315,   -11342,    10311,
+    1858,    -7777,     2145,     5436,     5677,     -113,   -10033,      826,
+   -1353,    17210,     7768,      986,    -1471,     8291,    -4982,     8207,
+  -14911,    -6255,    -2449,   -11881,    -7059,   -11703,    -4338,     8025,
+    7538,    -2823,   -12490,     9470,    -1613,    -2529,   -10092,    -7807,
+    9480,     6970,   -12844,     5123,     3532,     4816,     4803,    -8455,
+   -5045,    14032,    -4378,    -1643,     5756,   -11041,    -2732,   -16618,
+   -6430,   -18375,    -3320,     6098,     5131,    -4269,    -8840,     2482,
+   -7048,     1547,   -21890,    -6505,    -7414,     -424,   -11722,     7955,
+    1653,   -17299,     1823,      473,    -9232,     3337,     1111,      873,
+    4018,    -8982,     9889,     3531,   -11763,    -3799,     7373,    -4539,
+    3231,     7054,    -8537,     7616,     6244,    16635,      447,    -2915,
+   13967,      705,    -2669,    -1520,    -1771,   -16188,     5956,     5117,
+    6371,    -9936,    -1448,     2480,     5128,     7550,    -8130,     5236,
+    8213,    -6443,     7707,    -1950,   -13811,     7218,     7031,    -3883,
+      67,     5731,    -2874,    13480,    -3743,     9298,    -3280,     3552,
+   -4425,      -18,    -3785,    -9988,    -5357,     5477,   -11794,     2117,
+    1416,    -9935,     3376,      802,    -5079,    -8243,    12652,       66,
+    3653,    -2368,     6781,   -21895,    -7227,     2487,     7839,     -385,
+    6646,    -7016,    -4658,     5531,    -1705,      834,      129,     3694,
+   -1343,     2238,   -22640,    -6417,   -11139,    11301,    -2945,    -3494,
+   -5626,      185,    -3615,    -2041,    -7972,    -3106,      -60,   -23497,
+   -1566,    17064,     3519,     2518,      304,    -6805,   -10269,     2105,
+    1936,     -426,     -736,    -8122,    -1467,     4238,    -6939,   -13309,
+     360,     7402,    -7970,    12576,     3287,    12194,    -6289,   -16006,
+    9171,     4042,    -9193,     9123,    -2512,     6388,    -4734,    -8739,
+    1028,    -5406,    -1696,     5889,     -666,    -4736,     4971,     3565,
+    9362,    -6292,     3876,    -3652,   -19666,     7523,    -4061,      391,
+  -11773,     7502,    -3763,     4929,    -9478,    13278,     2805,     4496,
+    7814,    16419,    12455,   -14773,     2127,    -2746,     3763,     4847,
+    3698,     6978,     4751,    -6957,    -3581,      -45,     6252,     1513,
+   -4797,    -7925,    11270,    16188,    -2359,    -5269,     9376,   -10777,
+    7262,    20031,    -6515,    -2208,    -5353,     8085,    -1341,    -1303,
+    7333,     5576,     3625,     5763,    -7931,     9833,    -3371,   -10305,
+    6534,   -13539,    -9971,      997,     8464,    -4064,    -1495,     1857,
+   13624,     5458,     9490,   -11086,    -4524,    12022,     -550,     -198,
+     408,    -8455,    -7068,    10289,     9712,    -3366,     9028,    -7621,
+   -5243,     2362,     6909,     4672,    -4933,    -1799,     4709,    -4563,
+     -62,     -566,     1624,    -7010,    14730,   -17791,    -3697,    -2344,
+   -1741,     7099,    -9509,    -6855,    -1989,     3495,    -2289,     2031,
+   12784,      891,    14189,    -3963,    -5683,      421,   -12575,     1724,
+  -12682,    -5970,    -8169,     3143,    -1824,    -5488,    -5130,     8536,
+   12799,      794,     5738,     3459,   -11689,     -258,    -3738,    -3775,
+   -8742,     2333,     8312,    -9383,    10331,    13119,     8398,    10644,
+  -19433,    -6446,   -16277,   -11793,    16284,     9345,    15222,    15834,
+    2009,    -7349,      130,   -14547,      338,    -5998,     3337,    21492,
+    2406,     7703,     -951,    11196,     -564,     3406,     2217,     4806,
+    2374,    -5797,    11839,     8940,   -11874,    18213,     2855,    10492
+};
+
+static uint32_t IncreaseSeed(uint32_t* seed) {
+  seed[0] = (seed[0] * ((int32_t)69069) + 1) & (kMaxSeedUsed - 1);
+  return seed[0];
+}
+
+int16_t WebRtcSpl_RandU(uint32_t* seed) {
+  return (int16_t)(IncreaseSeed(seed) >> 16);
+}
+
+int16_t WebRtcSpl_RandN(uint32_t* seed) {
+  return kRandNTable[IncreaseSeed(seed) >> 23];
+}
+
+// Creates an array of uniformly distributed variables.
+int16_t WebRtcSpl_RandUArray(int16_t* vector,
+                             int16_t vector_length,
+                             uint32_t* seed) {
+  int i;
+  for (i = 0; i < vector_length; i++) {
+    vector[i] = WebRtcSpl_RandU(seed);
+  }
+  return vector_length;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/real_fft.c b/third_party/libwebrtc/common_audio/signal_processing/real_fft.c
new file mode 100644
index 0000000000..780e517a15
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/real_fft.c
@@ -0,0 +1,102 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/real_fft.h"
+
+#include <stdlib.h>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+struct RealFFT {
+  int order;
+};
+
+struct RealFFT* WebRtcSpl_CreateRealFFT(int order) {
+  struct RealFFT* self = NULL;
+
+  if (order > kMaxFFTOrder || order < 0) {
+    return NULL;
+  }
+
+  self = malloc(sizeof(struct RealFFT));
+  if (self == NULL) {
+    return NULL;
+  }
+  self->order = order;
+
+  return self;
+}
+
+void WebRtcSpl_FreeRealFFT(struct RealFFT* self) {
+  if (self != NULL) {
+    free(self);
+  }
+}
+
+// The C version FFT functions (i.e. WebRtcSpl_RealForwardFFT and
+// WebRtcSpl_RealInverseFFT) are real-valued FFT wrappers for complex-valued
+// FFT implementation in SPL.
+
+int WebRtcSpl_RealForwardFFT(struct RealFFT* self,
+                             const int16_t* real_data_in,
+                             int16_t* complex_data_out) {
+  int i = 0;
+  int j = 0;
+  int result = 0;
+  int n = 1 << self->order;
+  // The complex-value FFT implementation needs a buffer to hold 2^order
+  // 16-bit COMPLEX numbers, for both time and frequency data.
+  int16_t complex_buffer[2 << kMaxFFTOrder];
+
+  // Insert zeros to the imaginary parts for complex forward FFT input.
+  for (i = 0, j = 0; i < n; i += 1, j += 2) {
+    complex_buffer[j] = real_data_in[i];
+    complex_buffer[j + 1] = 0;
+  };
+
+  WebRtcSpl_ComplexBitReverse(complex_buffer, self->order);
+  result = WebRtcSpl_ComplexFFT(complex_buffer, self->order, 1);
+
+  // For real FFT output, use only the first N + 2 elements from
+  // complex forward FFT.
+  memcpy(complex_data_out, complex_buffer, sizeof(int16_t) * (n + 2));
+
+  return result;
+}
+
+int WebRtcSpl_RealInverseFFT(struct RealFFT* self,
+                             const int16_t* complex_data_in,
+                             int16_t* real_data_out) {
+  int i = 0;
+  int j = 0;
+  int result = 0;
+  int n = 1 << self->order;
+  // Create the buffer specific to complex-valued FFT implementation.
+  int16_t complex_buffer[2 << kMaxFFTOrder];
+
+  // For n-point FFT, first copy the first n + 2 elements into complex
+  // FFT, then construct the remaining n - 2 elements by real FFT's
+  // conjugate-symmetric properties.
+  memcpy(complex_buffer, complex_data_in, sizeof(int16_t) * (n + 2));
+  for (i = n + 2; i < 2 * n; i += 2) {
+    complex_buffer[i] = complex_data_in[2 * n - i];
+    complex_buffer[i + 1] = -complex_data_in[2 * n - i + 1];
+  }
+
+  WebRtcSpl_ComplexBitReverse(complex_buffer, self->order);
+  result = WebRtcSpl_ComplexIFFT(complex_buffer, self->order, 1);
+
+  // Strip out the imaginary parts of the complex inverse FFT output.
+  for (i = 0, j = 0; i < n; i += 1, j += 2) {
+    real_data_out[i] = complex_buffer[j];
+  }
+
+  return result;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/real_fft_unittest.cc b/third_party/libwebrtc/common_audio/signal_processing/real_fft_unittest.cc
new file mode 100644
index 0000000000..7cabe7d9fe
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/real_fft_unittest.cc
@@ -0,0 +1,98 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/signal_processing/include/real_fft.h"
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace {
+
+// FFT order.
+const int kOrder = 5;
+// Lengths for real FFT's time and frequency bufffers.
+// For N-point FFT, the length requirements from API are N and N+2 respectively.
+const int kTimeDataLength = 1 << kOrder;
+const int kFreqDataLength = (1 << kOrder) + 2;
+// For complex FFT's time and freq buffer. The implementation requires
+// 2*N 16-bit words.
+const int kComplexFftDataLength = 2 << kOrder;
+// Reference data for time signal.
+const int16_t kRefData[kTimeDataLength] = {
+    11739,  6848,  -8688,  31980, -30295, 25242, 27085,  19410,
+    -26299, 15607, -10791, 11778, -23819, 14498, -25772, 10076,
+    1173,   6848,  -8688,  31980, -30295, 2522,  27085,  19410,
+    -2629,  5607,  -3,     1178,  -23819, 1498,  -25772, 10076};
+
+TEST(RealFFTTest, CreateFailsOnBadInput) {
+  RealFFT* fft = WebRtcSpl_CreateRealFFT(11);
+  EXPECT_TRUE(fft == nullptr);
+  fft = WebRtcSpl_CreateRealFFT(-1);
+  EXPECT_TRUE(fft == nullptr);
+}
+
+TEST(RealFFTTest, RealAndComplexMatch) {
+  int i = 0;
+  int j = 0;
+  int16_t real_fft_time[kTimeDataLength] = {0};
+  int16_t real_fft_freq[kFreqDataLength] = {0};
+  // One common buffer for complex FFT's time and frequency data.
+  int16_t complex_fft_buff[kComplexFftDataLength] = {0};
+
+  // Prepare the inputs to forward FFT's.
+  memcpy(real_fft_time, kRefData, sizeof(kRefData));
+  for (i = 0, j = 0; i < kTimeDataLength; i += 1, j += 2) {
+    complex_fft_buff[j] = kRefData[i];
+    complex_fft_buff[j + 1] = 0;  // Insert zero's to imaginary parts.
+  }
+
+  // Create and run real forward FFT.
+  RealFFT* fft = WebRtcSpl_CreateRealFFT(kOrder);
+  EXPECT_TRUE(fft != nullptr);
+  EXPECT_EQ(0, WebRtcSpl_RealForwardFFT(fft, real_fft_time, real_fft_freq));
+
+  // Run complex forward FFT.
+  WebRtcSpl_ComplexBitReverse(complex_fft_buff, kOrder);
+  EXPECT_EQ(0, WebRtcSpl_ComplexFFT(complex_fft_buff, kOrder, 1));
+
+  // Verify the results between complex and real forward FFT.
+  for (i = 0; i < kFreqDataLength; i++) {
+    EXPECT_EQ(real_fft_freq[i], complex_fft_buff[i]);
+  }
+
+  // Prepare the inputs to inverse real FFT.
+  // We use whatever data in complex_fft_buff[] since we don't care
+  // about data contents. Only kFreqDataLength 16-bit words are copied
+  // from complex_fft_buff to real_fft_freq since remaining words (2nd half)
+  // are conjugate-symmetric to the first half in theory.
+  memcpy(real_fft_freq, complex_fft_buff, sizeof(real_fft_freq));
+
+  // Run real inverse FFT.
+  int real_scale = WebRtcSpl_RealInverseFFT(fft, real_fft_freq, real_fft_time);
+  EXPECT_GE(real_scale, 0);
+
+  // Run complex inverse FFT.
+  WebRtcSpl_ComplexBitReverse(complex_fft_buff, kOrder);
+  int complex_scale = WebRtcSpl_ComplexIFFT(complex_fft_buff, kOrder, 1);
+
+  // Verify the results between complex and real inverse FFT.
+  // They are not bit-exact, since complex IFFT doesn't produce
+  // exactly conjugate-symmetric data (between first and second half).
+  EXPECT_EQ(real_scale, complex_scale);
+  for (i = 0, j = 0; i < kTimeDataLength; i += 1, j += 2) {
+    EXPECT_LE(abs(real_fft_time[i] - complex_fft_buff[j]), 1);
+  }
+
+  WebRtcSpl_FreeRealFFT(fft);
+}
+
+}  // namespace
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/signal_processing/refl_coef_to_lpc.c b/third_party/libwebrtc/common_audio/signal_processing/refl_coef_to_lpc.c
new file mode 100644
index 0000000000..b0858b2b0e
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/refl_coef_to_lpc.c
@@ -0,0 +1,59 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_ReflCoefToLpc().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_ReflCoefToLpc(const int16_t *k, int use_order, int16_t *a)
+{
+    int16_t any[WEBRTC_SPL_MAX_LPC_ORDER + 1];
+    int16_t *aptr, *aptr2, *anyptr;
+    const int16_t *kptr;
+    int m, i;
+
+    kptr = k;
+    *a = 4096; // i.e., (Word16_MAX >> 3)+1.
+    *any = *a;
+    a[1] = *k >> 3;
+
+    for (m = 1; m < use_order; m++)
+    {
+        kptr++;
+        aptr = a;
+        aptr++;
+        aptr2 = &a[m];
+        anyptr = any;
+        anyptr++;
+
+        any[m + 1] = *kptr >> 3;
+        for (i = 0; i < m; i++)
+        {
+            *anyptr = *aptr + (int16_t)((*aptr2 * *kptr) >> 15);
+            anyptr++;
+            aptr++;
+            aptr2--;
+        }
+
+        aptr = a;
+        anyptr = any;
+        for (i = 0; i < (m + 2); i++)
+        {
+            *aptr = *anyptr;
+            aptr++;
+            anyptr++;
+        }
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/resample.c b/third_party/libwebrtc/common_audio/signal_processing/resample.c
new file mode 100644
index 0000000000..d4b2736476
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/resample.c
@@ -0,0 +1,505 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the resampling functions for 22 kHz.
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/signal_processing/resample_by_2_internal.h"
+
+// Declaration of internally used functions
+static void WebRtcSpl_32khzTo22khzIntToShort(const int32_t *In, int16_t *Out,
+                                             int32_t K);
+
+void WebRtcSpl_32khzTo22khzIntToInt(const int32_t *In, int32_t *Out,
+                                    int32_t K);
+
+// interpolation coefficients
+static const int16_t kCoefficients32To22[5][9] = {
+        {127, -712,  2359, -6333, 23456, 16775, -3695,  945, -154},
+        {-39,  230,  -830,  2785, 32366, -2324,   760, -218,   38},
+        {117, -663,  2222, -6133, 26634, 13070, -3174,  831, -137},
+        {-77,  457, -1677,  5958, 31175, -4136,  1405, -408,   71},
+        { 98, -560,  1900, -5406, 29240,  9423, -2480,  663, -110}
+};
+
+//////////////////////
+// 22 kHz -> 16 kHz //
+//////////////////////
+
+// number of subblocks; options: 1, 2, 4, 5, 10
+#define SUB_BLOCKS_22_16    5
+
+// 22 -> 16 resampler
+void WebRtcSpl_Resample22khzTo16khz(const int16_t* in, int16_t* out,
+                                    WebRtcSpl_State22khzTo16khz* state, int32_t* tmpmem)
+{
+    int k;
+
+    // process two blocks of 10/SUB_BLOCKS_22_16 ms (to reduce temp buffer size)
+    for (k = 0; k < SUB_BLOCKS_22_16; k++)
+    {
+        ///// 22 --> 44 /////
+        // int16_t  in[220/SUB_BLOCKS_22_16]
+        // int32_t out[440/SUB_BLOCKS_22_16]
+        /////
+        WebRtcSpl_UpBy2ShortToInt(in, 220 / SUB_BLOCKS_22_16, tmpmem + 16, state->S_22_44);
+
+        ///// 44 --> 32 /////
+        // int32_t  in[440/SUB_BLOCKS_22_16]
+        // int32_t out[320/SUB_BLOCKS_22_16]
+        /////
+        // copy state to and from input array
+        tmpmem[8] = state->S_44_32[0];
+        tmpmem[9] = state->S_44_32[1];
+        tmpmem[10] = state->S_44_32[2];
+        tmpmem[11] = state->S_44_32[3];
+        tmpmem[12] = state->S_44_32[4];
+        tmpmem[13] = state->S_44_32[5];
+        tmpmem[14] = state->S_44_32[6];
+        tmpmem[15] = state->S_44_32[7];
+        state->S_44_32[0] = tmpmem[440 / SUB_BLOCKS_22_16 + 8];
+        state->S_44_32[1] = tmpmem[440 / SUB_BLOCKS_22_16 + 9];
+        state->S_44_32[2] = tmpmem[440 / SUB_BLOCKS_22_16 + 10];
+        state->S_44_32[3] = tmpmem[440 / SUB_BLOCKS_22_16 + 11];
+        state->S_44_32[4] = tmpmem[440 / SUB_BLOCKS_22_16 + 12];
+        state->S_44_32[5] = tmpmem[440 / SUB_BLOCKS_22_16 + 13];
+        state->S_44_32[6] = tmpmem[440 / SUB_BLOCKS_22_16 + 14];
+        state->S_44_32[7] = tmpmem[440 / SUB_BLOCKS_22_16 + 15];
+
+        WebRtcSpl_Resample44khzTo32khz(tmpmem + 8, tmpmem, 40 / SUB_BLOCKS_22_16);
+
+        ///// 32 --> 16 /////
+        // int32_t  in[320/SUB_BLOCKS_22_16]
+        // int32_t out[160/SUB_BLOCKS_22_16]
+        /////
+        WebRtcSpl_DownBy2IntToShort(tmpmem, 320 / SUB_BLOCKS_22_16, out, state->S_32_16);
+
+        // move input/output pointers 10/SUB_BLOCKS_22_16 ms seconds ahead
+        in += 220 / SUB_BLOCKS_22_16;
+        out += 160 / SUB_BLOCKS_22_16;
+    }
+}
+
+// initialize state of 22 -> 16 resampler
+void WebRtcSpl_ResetResample22khzTo16khz(WebRtcSpl_State22khzTo16khz* state)
+{
+    int k;
+    for (k = 0; k < 8; k++)
+    {
+        state->S_22_44[k] = 0;
+        state->S_44_32[k] = 0;
+        state->S_32_16[k] = 0;
+    }
+}
+
+//////////////////////
+// 16 kHz -> 22 kHz //
+//////////////////////
+
+// number of subblocks; options: 1, 2, 4, 5, 10
+#define SUB_BLOCKS_16_22    4
+
+// 16 -> 22 resampler
+void WebRtcSpl_Resample16khzTo22khz(const int16_t* in, int16_t* out,
+                                    WebRtcSpl_State16khzTo22khz* state, int32_t* tmpmem)
+{
+    int k;
+
+    // process two blocks of 10/SUB_BLOCKS_16_22 ms (to reduce temp buffer size)
+    for (k = 0; k < SUB_BLOCKS_16_22; k++)
+    {
+        ///// 16 --> 32 /////
+        // int16_t  in[160/SUB_BLOCKS_16_22]
+        // int32_t out[320/SUB_BLOCKS_16_22]
+        /////
+        WebRtcSpl_UpBy2ShortToInt(in, 160 / SUB_BLOCKS_16_22, tmpmem + 8, state->S_16_32);
+
+        ///// 32 --> 22 /////
+        // int32_t  in[320/SUB_BLOCKS_16_22]
+        // int32_t out[220/SUB_BLOCKS_16_22]
+        /////
+        // copy state to and from input array
+        tmpmem[0] = state->S_32_22[0];
+        tmpmem[1] = state->S_32_22[1];
+        tmpmem[2] = state->S_32_22[2];
+        tmpmem[3] = state->S_32_22[3];
+        tmpmem[4] = state->S_32_22[4];
+        tmpmem[5] = state->S_32_22[5];
+        tmpmem[6] = state->S_32_22[6];
+        tmpmem[7] = state->S_32_22[7];
+        state->S_32_22[0] = tmpmem[320 / SUB_BLOCKS_16_22];
+        state->S_32_22[1] = tmpmem[320 / SUB_BLOCKS_16_22 + 1];
+        state->S_32_22[2] = tmpmem[320 / SUB_BLOCKS_16_22 + 2];
+        state->S_32_22[3] = tmpmem[320 / SUB_BLOCKS_16_22 + 3];
+        state->S_32_22[4] = tmpmem[320 / SUB_BLOCKS_16_22 + 4];
+        state->S_32_22[5] = tmpmem[320 / SUB_BLOCKS_16_22 + 5];
+        state->S_32_22[6] = tmpmem[320 / SUB_BLOCKS_16_22 + 6];
+        state->S_32_22[7] = tmpmem[320 / SUB_BLOCKS_16_22 + 7];
+
+        WebRtcSpl_32khzTo22khzIntToShort(tmpmem, out, 20 / SUB_BLOCKS_16_22);
+
+        // move input/output pointers 10/SUB_BLOCKS_16_22 ms seconds ahead
+        in += 160 / SUB_BLOCKS_16_22;
+        out += 220 / SUB_BLOCKS_16_22;
+    }
+}
+
+// initialize state of 16 -> 22 resampler
+void WebRtcSpl_ResetResample16khzTo22khz(WebRtcSpl_State16khzTo22khz* state)
+{
+    int k;
+    for (k = 0; k < 8; k++)
+    {
+        state->S_16_32[k] = 0;
+        state->S_32_22[k] = 0;
+    }
+}
+
+//////////////////////
+// 22 kHz ->  8 kHz //
+//////////////////////
+
+// number of subblocks; options: 1, 2, 5, 10
+#define SUB_BLOCKS_22_8     2
+
+// 22 -> 8 resampler
+void WebRtcSpl_Resample22khzTo8khz(const int16_t* in, int16_t* out,
+                                   WebRtcSpl_State22khzTo8khz* state, int32_t* tmpmem)
+{
+    int k;
+
+    // process two blocks of 10/SUB_BLOCKS_22_8 ms (to reduce temp buffer size)
+    for (k = 0; k < SUB_BLOCKS_22_8; k++)
+    {
+        ///// 22 --> 22 lowpass /////
+        // int16_t  in[220/SUB_BLOCKS_22_8]
+        // int32_t out[220/SUB_BLOCKS_22_8]
+        /////
+        WebRtcSpl_LPBy2ShortToInt(in, 220 / SUB_BLOCKS_22_8, tmpmem + 16, state->S_22_22);
+
+        ///// 22 --> 16 /////
+        // int32_t  in[220/SUB_BLOCKS_22_8]
+        // int32_t out[160/SUB_BLOCKS_22_8]
+        /////
+        // copy state to and from input array
+        tmpmem[8] = state->S_22_16[0];
+        tmpmem[9] = state->S_22_16[1];
+        tmpmem[10] = state->S_22_16[2];
+        tmpmem[11] = state->S_22_16[3];
+        tmpmem[12] = state->S_22_16[4];
+        tmpmem[13] = state->S_22_16[5];
+        tmpmem[14] = state->S_22_16[6];
+        tmpmem[15] = state->S_22_16[7];
+        state->S_22_16[0] = tmpmem[220 / SUB_BLOCKS_22_8 + 8];
+        state->S_22_16[1] = tmpmem[220 / SUB_BLOCKS_22_8 + 9];
+        state->S_22_16[2] = tmpmem[220 / SUB_BLOCKS_22_8 + 10];
+        state->S_22_16[3] = tmpmem[220 / SUB_BLOCKS_22_8 + 11];
+        state->S_22_16[4] = tmpmem[220 / SUB_BLOCKS_22_8 + 12];
+        state->S_22_16[5] = tmpmem[220 / SUB_BLOCKS_22_8 + 13];
+        state->S_22_16[6] = tmpmem[220 / SUB_BLOCKS_22_8 + 14];
+        state->S_22_16[7] = tmpmem[220 / SUB_BLOCKS_22_8 + 15];
+
+        WebRtcSpl_Resample44khzTo32khz(tmpmem + 8, tmpmem, 20 / SUB_BLOCKS_22_8);
+
+        ///// 16 --> 8 /////
+        // int32_t in[160/SUB_BLOCKS_22_8]
+        // int32_t out[80/SUB_BLOCKS_22_8]
+        /////
+        WebRtcSpl_DownBy2IntToShort(tmpmem, 160 / SUB_BLOCKS_22_8, out, state->S_16_8);
+
+        // move input/output pointers 10/SUB_BLOCKS_22_8 ms seconds ahead
+        in += 220 / SUB_BLOCKS_22_8;
+        out += 80 / SUB_BLOCKS_22_8;
+    }
+}
+
+// initialize state of 22 -> 8 resampler
+void WebRtcSpl_ResetResample22khzTo8khz(WebRtcSpl_State22khzTo8khz* state)
+{
+    int k;
+    for (k = 0; k < 8; k++)
+    {
+        state->S_22_22[k] = 0;
+        state->S_22_22[k + 8] = 0;
+        state->S_22_16[k] = 0;
+        state->S_16_8[k] = 0;
+    }
+}
+
+//////////////////////
+//  8 kHz -> 22 kHz //
+//////////////////////
+
+// number of subblocks; options: 1, 2, 5, 10
+#define SUB_BLOCKS_8_22     2
+
+// 8 -> 22 resampler
+void WebRtcSpl_Resample8khzTo22khz(const int16_t* in, int16_t* out,
+                                   WebRtcSpl_State8khzTo22khz* state, int32_t* tmpmem)
+{
+    int k;
+
+    // process two blocks of 10/SUB_BLOCKS_8_22 ms (to reduce temp buffer size)
+    for (k = 0; k < SUB_BLOCKS_8_22; k++)
+    {
+        ///// 8 --> 16 /////
+        // int16_t  in[80/SUB_BLOCKS_8_22]
+        // int32_t out[160/SUB_BLOCKS_8_22]
+        /////
+        WebRtcSpl_UpBy2ShortToInt(in, 80 / SUB_BLOCKS_8_22, tmpmem + 18, state->S_8_16);
+
+        ///// 16 --> 11 /////
+        // int32_t  in[160/SUB_BLOCKS_8_22]
+        // int32_t out[110/SUB_BLOCKS_8_22]
+        /////
+        // copy state to and from input array
+        tmpmem[10] = state->S_16_11[0];
+        tmpmem[11] = state->S_16_11[1];
+        tmpmem[12] = state->S_16_11[2];
+        tmpmem[13] = state->S_16_11[3];
+        tmpmem[14] = state->S_16_11[4];
+        tmpmem[15] = state->S_16_11[5];
+        tmpmem[16] = state->S_16_11[6];
+        tmpmem[17] = state->S_16_11[7];
+        state->S_16_11[0] = tmpmem[160 / SUB_BLOCKS_8_22 + 10];
+        state->S_16_11[1] = tmpmem[160 / SUB_BLOCKS_8_22 + 11];
+        state->S_16_11[2] = tmpmem[160 / SUB_BLOCKS_8_22 + 12];
+        state->S_16_11[3] = tmpmem[160 / SUB_BLOCKS_8_22 + 13];
+        state->S_16_11[4] = tmpmem[160 / SUB_BLOCKS_8_22 + 14];
+        state->S_16_11[5] = tmpmem[160 / SUB_BLOCKS_8_22 + 15];
+        state->S_16_11[6] = tmpmem[160 / SUB_BLOCKS_8_22 + 16];
+        state->S_16_11[7] = tmpmem[160 / SUB_BLOCKS_8_22 + 17];
+
+        WebRtcSpl_32khzTo22khzIntToInt(tmpmem + 10, tmpmem, 10 / SUB_BLOCKS_8_22);
+
+        ///// 11 --> 22 /////
+        // int32_t  in[110/SUB_BLOCKS_8_22]
+        // int16_t out[220/SUB_BLOCKS_8_22]
+        /////
+        WebRtcSpl_UpBy2IntToShort(tmpmem, 110 / SUB_BLOCKS_8_22, out, state->S_11_22);
+
+        // move input/output pointers 10/SUB_BLOCKS_8_22 ms seconds ahead
+        in += 80 / SUB_BLOCKS_8_22;
+        out += 220 / SUB_BLOCKS_8_22;
+    }
+}
+
+// initialize state of 8 -> 22 resampler
+void WebRtcSpl_ResetResample8khzTo22khz(WebRtcSpl_State8khzTo22khz* state)
+{
+    int k;
+    for (k = 0; k < 8; k++)
+    {
+        state->S_8_16[k] = 0;
+        state->S_16_11[k] = 0;
+        state->S_11_22[k] = 0;
+    }
+}
+
+// compute two inner-products and store them to output array
+static void WebRtcSpl_DotProdIntToInt(const int32_t* in1, const int32_t* in2,
+                                      const int16_t* coef_ptr, int32_t* out1,
+                                      int32_t* out2)
+{
+    int32_t tmp1 = 16384;
+    int32_t tmp2 = 16384;
+    int16_t coef;
+
+    coef = coef_ptr[0];
+    tmp1 += coef * in1[0];
+    tmp2 += coef * in2[-0];
+
+    coef = coef_ptr[1];
+    tmp1 += coef * in1[1];
+    tmp2 += coef * in2[-1];
+
+    coef = coef_ptr[2];
+    tmp1 += coef * in1[2];
+    tmp2 += coef * in2[-2];
+
+    coef = coef_ptr[3];
+    tmp1 += coef * in1[3];
+    tmp2 += coef * in2[-3];
+
+    coef = coef_ptr[4];
+    tmp1 += coef * in1[4];
+    tmp2 += coef * in2[-4];
+
+    coef = coef_ptr[5];
+    tmp1 += coef * in1[5];
+    tmp2 += coef * in2[-5];
+
+    coef = coef_ptr[6];
+    tmp1 += coef * in1[6];
+    tmp2 += coef * in2[-6];
+
+    coef = coef_ptr[7];
+    tmp1 += coef * in1[7];
+    tmp2 += coef * in2[-7];
+
+    coef = coef_ptr[8];
+    *out1 = tmp1 + coef * in1[8];
+    *out2 = tmp2 + coef * in2[-8];
+}
+
+// compute two inner-products and store them to output array
+static void WebRtcSpl_DotProdIntToShort(const int32_t* in1, const int32_t* in2,
+                                        const int16_t* coef_ptr, int16_t* out1,
+                                        int16_t* out2)
+{
+    int32_t tmp1 = 16384;
+    int32_t tmp2 = 16384;
+    int16_t coef;
+
+    coef = coef_ptr[0];
+    tmp1 += coef * in1[0];
+    tmp2 += coef * in2[-0];
+
+    coef = coef_ptr[1];
+    tmp1 += coef * in1[1];
+    tmp2 += coef * in2[-1];
+
+    coef = coef_ptr[2];
+    tmp1 += coef * in1[2];
+    tmp2 += coef * in2[-2];
+
+    coef = coef_ptr[3];
+    tmp1 += coef * in1[3];
+    tmp2 += coef * in2[-3];
+
+    coef = coef_ptr[4];
+    tmp1 += coef * in1[4];
+    tmp2 += coef * in2[-4];
+
+    coef = coef_ptr[5];
+    tmp1 += coef * in1[5];
+    tmp2 += coef * in2[-5];
+
+    coef = coef_ptr[6];
+    tmp1 += coef * in1[6];
+    tmp2 += coef * in2[-6];
+
+    coef = coef_ptr[7];
+    tmp1 += coef * in1[7];
+    tmp2 += coef * in2[-7];
+
+    coef = coef_ptr[8];
+    tmp1 += coef * in1[8];
+    tmp2 += coef * in2[-8];
+
+    // scale down, round and saturate
+    tmp1 >>= 15;
+    if (tmp1 > (int32_t)0x00007FFF)
+        tmp1 = 0x00007FFF;
+    if (tmp1 < (int32_t)0xFFFF8000)
+        tmp1 = 0xFFFF8000;
+    tmp2 >>= 15;
+    if (tmp2 > (int32_t)0x00007FFF)
+        tmp2 = 0x00007FFF;
+    if (tmp2 < (int32_t)0xFFFF8000)
+        tmp2 = 0xFFFF8000;
+    *out1 = (int16_t)tmp1;
+    *out2 = (int16_t)tmp2;
+}
+
+//   Resampling ratio: 11/16
+// input:  int32_t (normalized, not saturated) :: size 16 * K
+// output: int32_t (shifted 15 positions to the left, + offset 16384) :: size 11 * K
+//      K: Number of blocks
+
+void WebRtcSpl_32khzTo22khzIntToInt(const int32_t* In,
+                                    int32_t* Out,
+                                    int32_t K)
+{
+    /////////////////////////////////////////////////////////////
+    // Filter operation:
+    //
+    // Perform resampling (16 input samples -> 11 output samples);
+    // process in sub blocks of size 16 samples.
+    int32_t m;
+
+    for (m = 0; m < K; m++)
+    {
+        // first output sample
+        Out[0] = ((int32_t)In[3] << 15) + (1 << 14);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToInt(&In[0], &In[22], kCoefficients32To22[0], &Out[1], &Out[10]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToInt(&In[2], &In[20], kCoefficients32To22[1], &Out[2], &Out[9]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToInt(&In[3], &In[19], kCoefficients32To22[2], &Out[3], &Out[8]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToInt(&In[5], &In[17], kCoefficients32To22[3], &Out[4], &Out[7]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToInt(&In[6], &In[16], kCoefficients32To22[4], &Out[5], &Out[6]);
+
+        // update pointers
+        In += 16;
+        Out += 11;
+    }
+}
+
+//   Resampling ratio: 11/16
+// input:  int32_t (normalized, not saturated) :: size 16 * K
+// output: int16_t (saturated) :: size 11 * K
+//      K: Number of blocks
+
+void WebRtcSpl_32khzTo22khzIntToShort(const int32_t *In,
+                                      int16_t *Out,
+                                      int32_t K)
+{
+    /////////////////////////////////////////////////////////////
+    // Filter operation:
+    //
+    // Perform resampling (16 input samples -> 11 output samples);
+    // process in sub blocks of size 16 samples.
+    int32_t tmp;
+    int32_t m;
+
+    for (m = 0; m < K; m++)
+    {
+        // first output sample
+        tmp = In[3];
+        if (tmp > (int32_t)0x00007FFF)
+            tmp = 0x00007FFF;
+        if (tmp < (int32_t)0xFFFF8000)
+            tmp = 0xFFFF8000;
+        Out[0] = (int16_t)tmp;
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToShort(&In[0], &In[22], kCoefficients32To22[0], &Out[1], &Out[10]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToShort(&In[2], &In[20], kCoefficients32To22[1], &Out[2], &Out[9]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToShort(&In[3], &In[19], kCoefficients32To22[2], &Out[3], &Out[8]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToShort(&In[5], &In[17], kCoefficients32To22[3], &Out[4], &Out[7]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_DotProdIntToShort(&In[6], &In[16], kCoefficients32To22[4], &Out[5], &Out[6]);
+
+        // update pointers
+        In += 16;
+        Out += 11;
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/resample_48khz.c b/third_party/libwebrtc/common_audio/signal_processing/resample_48khz.c
new file mode 100644
index 0000000000..8518e7b1ce
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/resample_48khz.c
@@ -0,0 +1,186 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains resampling functions between 48 kHz and nb/wb.
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include <string.h>
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/signal_processing/resample_by_2_internal.h"
+
+////////////////////////////
+///// 48 kHz -> 16 kHz /////
+////////////////////////////
+
+// 48 -> 16 resampler
+void WebRtcSpl_Resample48khzTo16khz(const int16_t* in, int16_t* out,
+                                    WebRtcSpl_State48khzTo16khz* state, int32_t* tmpmem)
+{
+    ///// 48 --> 48(LP) /////
+    // int16_t  in[480]
+    // int32_t out[480]
+    /////
+    WebRtcSpl_LPBy2ShortToInt(in, 480, tmpmem + 16, state->S_48_48);
+
+    ///// 48 --> 32 /////
+    // int32_t  in[480]
+    // int32_t out[320]
+    /////
+    // copy state to and from input array
+    memcpy(tmpmem + 8, state->S_48_32, 8 * sizeof(int32_t));
+    memcpy(state->S_48_32, tmpmem + 488, 8 * sizeof(int32_t));
+    WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 160);
+
+    ///// 32 --> 16 /////
+    // int32_t  in[320]
+    // int16_t out[160]
+    /////
+    WebRtcSpl_DownBy2IntToShort(tmpmem, 320, out, state->S_32_16);
+}
+
+// initialize state of 48 -> 16 resampler
+void WebRtcSpl_ResetResample48khzTo16khz(WebRtcSpl_State48khzTo16khz* state)
+{
+    memset(state->S_48_48, 0, 16 * sizeof(int32_t));
+    memset(state->S_48_32, 0, 8 * sizeof(int32_t));
+    memset(state->S_32_16, 0, 8 * sizeof(int32_t));
+}
+
+////////////////////////////
+///// 16 kHz -> 48 kHz /////
+////////////////////////////
+
+// 16 -> 48 resampler
+void WebRtcSpl_Resample16khzTo48khz(const int16_t* in, int16_t* out,
+                                    WebRtcSpl_State16khzTo48khz* state, int32_t* tmpmem)
+{
+    ///// 16 --> 32 /////
+    // int16_t  in[160]
+    // int32_t out[320]
+    /////
+    WebRtcSpl_UpBy2ShortToInt(in, 160, tmpmem + 16, state->S_16_32);
+
+    ///// 32 --> 24 /////
+    // int32_t  in[320]
+    // int32_t out[240]
+    // copy state to and from input array
+    /////
+    memcpy(tmpmem + 8, state->S_32_24, 8 * sizeof(int32_t));
+    memcpy(state->S_32_24, tmpmem + 328, 8 * sizeof(int32_t));
+    WebRtcSpl_Resample32khzTo24khz(tmpmem + 8, tmpmem, 80);
+
+    ///// 24 --> 48 /////
+    // int32_t  in[240]
+    // int16_t out[480]
+    /////
+    WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48);
+}
+
+// initialize state of 16 -> 48 resampler
+void WebRtcSpl_ResetResample16khzTo48khz(WebRtcSpl_State16khzTo48khz* state)
+{
+    memset(state->S_16_32, 0, 8 * sizeof(int32_t));
+    memset(state->S_32_24, 0, 8 * sizeof(int32_t));
+    memset(state->S_24_48, 0, 8 * sizeof(int32_t));
+}
+
+////////////////////////////
+///// 48 kHz ->  8 kHz /////
+////////////////////////////
+
+// 48 -> 8 resampler
+void WebRtcSpl_Resample48khzTo8khz(const int16_t* in, int16_t* out,
+                                   WebRtcSpl_State48khzTo8khz* state, int32_t* tmpmem)
+{
+    ///// 48 --> 24 /////
+    // int16_t  in[480]
+    // int32_t out[240]
+    /////
+    WebRtcSpl_DownBy2ShortToInt(in, 480, tmpmem + 256, state->S_48_24);
+
+    ///// 24 --> 24(LP) /////
+    // int32_t  in[240]
+    // int32_t out[240]
+    /////
+    WebRtcSpl_LPBy2IntToInt(tmpmem + 256, 240, tmpmem + 16, state->S_24_24);
+
+    ///// 24 --> 16 /////
+    // int32_t  in[240]
+    // int32_t out[160]
+    /////
+    // copy state to and from input array
+    memcpy(tmpmem + 8, state->S_24_16, 8 * sizeof(int32_t));
+    memcpy(state->S_24_16, tmpmem + 248, 8 * sizeof(int32_t));
+    WebRtcSpl_Resample48khzTo32khz(tmpmem + 8, tmpmem, 80);
+
+    ///// 16 --> 8 /////
+    // int32_t  in[160]
+    // int16_t out[80]
+    /////
+    WebRtcSpl_DownBy2IntToShort(tmpmem, 160, out, state->S_16_8);
+}
+
+// initialize state of 48 -> 8 resampler
+void WebRtcSpl_ResetResample48khzTo8khz(WebRtcSpl_State48khzTo8khz* state)
+{
+    memset(state->S_48_24, 0, 8 * sizeof(int32_t));
+    memset(state->S_24_24, 0, 16 * sizeof(int32_t));
+    memset(state->S_24_16, 0, 8 * sizeof(int32_t));
+    memset(state->S_16_8, 0, 8 * sizeof(int32_t));
+}
+
+////////////////////////////
+/////  8 kHz -> 48 kHz /////
+////////////////////////////
+
+// 8 -> 48 resampler
+void WebRtcSpl_Resample8khzTo48khz(const int16_t* in, int16_t* out,
+                                   WebRtcSpl_State8khzTo48khz* state, int32_t* tmpmem)
+{
+    ///// 8 --> 16 /////
+    // int16_t  in[80]
+    // int32_t out[160]
+    /////
+    WebRtcSpl_UpBy2ShortToInt(in, 80, tmpmem + 264, state->S_8_16);
+
+    ///// 16 --> 12 /////
+    // int32_t  in[160]
+    // int32_t out[120]
+    /////
+    // copy state to and from input array
+    memcpy(tmpmem + 256, state->S_16_12, 8 * sizeof(int32_t));
+    memcpy(state->S_16_12, tmpmem + 416, 8 * sizeof(int32_t));
+    WebRtcSpl_Resample32khzTo24khz(tmpmem + 256, tmpmem + 240, 40);
+
+    ///// 12 --> 24 /////
+    // int32_t  in[120]
+    // int16_t out[240]
+    /////
+    WebRtcSpl_UpBy2IntToInt(tmpmem + 240, 120, tmpmem, state->S_12_24);
+
+    ///// 24 --> 48 /////
+    // int32_t  in[240]
+    // int16_t out[480]
+    /////
+    WebRtcSpl_UpBy2IntToShort(tmpmem, 240, out, state->S_24_48);
+}
+
+// initialize state of 8 -> 48 resampler
+void WebRtcSpl_ResetResample8khzTo48khz(WebRtcSpl_State8khzTo48khz* state)
+{
+    memset(state->S_8_16, 0, 8 * sizeof(int32_t));
+    memset(state->S_16_12, 0, 8 * sizeof(int32_t));
+    memset(state->S_12_24, 0, 8 * sizeof(int32_t));
+    memset(state->S_24_48, 0, 8 * sizeof(int32_t));
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/resample_by_2.c b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2.c
new file mode 100644
index 0000000000..73e1950654
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2.c
@@ -0,0 +1,183 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the resampling by two functions.
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#ifdef WEBRTC_ARCH_ARM_V7
+
+// allpass filter coefficients.
+static const uint32_t kResampleAllpass1[3] = {3284, 24441, 49528 << 15};
+static const uint32_t kResampleAllpass2[3] =
+  {12199, 37471 << 15, 60255 << 15};
+
+// Multiply two 32-bit values and accumulate to another input value.
+// Return: state + ((diff * tbl_value) >> 16)
+
+static __inline int32_t MUL_ACCUM_1(int32_t tbl_value,
+                                    int32_t diff,
+                                    int32_t state) {
+  int32_t result;
+  __asm __volatile ("smlawb %0, %1, %2, %3": "=r"(result): "r"(diff),
+                                   "r"(tbl_value), "r"(state));
+  return result;
+}
+
+// Multiply two 32-bit values and accumulate to another input value.
+// Return: Return: state + (((diff << 1) * tbl_value) >> 32)
+//
+// The reason to introduce this function is that, in case we can't use smlawb
+// instruction (in MUL_ACCUM_1) due to input value range, we can still use 
+// smmla to save some cycles.
+
+static __inline int32_t MUL_ACCUM_2(int32_t tbl_value,
+                                    int32_t diff,
+                                    int32_t state) {
+  int32_t result;
+  __asm __volatile ("smmla %0, %1, %2, %3": "=r"(result): "r"(diff << 1),
+                                  "r"(tbl_value), "r"(state));
+  return result;
+}
+
+#else
+
+// allpass filter coefficients.
+static const uint16_t kResampleAllpass1[3] = {3284, 24441, 49528};
+static const uint16_t kResampleAllpass2[3] = {12199, 37471, 60255};
+
+// Multiply a 32-bit value with a 16-bit value and accumulate to another input:
+#define MUL_ACCUM_1(a, b, c) WEBRTC_SPL_SCALEDIFF32(a, b, c)
+#define MUL_ACCUM_2(a, b, c) WEBRTC_SPL_SCALEDIFF32(a, b, c)
+
+#endif  // WEBRTC_ARCH_ARM_V7
+
+
+// decimator
+#if !defined(MIPS32_LE)
+void WebRtcSpl_DownsampleBy2(const int16_t* in, size_t len,
+                             int16_t* out, int32_t* filtState) {
+  int32_t tmp1, tmp2, diff, in32, out32;
+  size_t i;
+
+  register int32_t state0 = filtState[0];
+  register int32_t state1 = filtState[1];
+  register int32_t state2 = filtState[2];
+  register int32_t state3 = filtState[3];
+  register int32_t state4 = filtState[4];
+  register int32_t state5 = filtState[5];
+  register int32_t state6 = filtState[6];
+  register int32_t state7 = filtState[7];
+
+  for (i = (len >> 1); i > 0; i--) {
+    // lower allpass filter
+    in32 = (int32_t)(*in++) * (1 << 10);
+    diff = in32 - state1;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass2[0], diff, state0);
+    state0 = in32;
+    diff = tmp1 - state2;
+    tmp2 = MUL_ACCUM_2(kResampleAllpass2[1], diff, state1);
+    state1 = tmp1;
+    diff = tmp2 - state3;
+    state3 = MUL_ACCUM_2(kResampleAllpass2[2], diff, state2);
+    state2 = tmp2;
+
+    // upper allpass filter
+    in32 = (int32_t)(*in++) * (1 << 10);
+    diff = in32 - state5;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass1[0], diff, state4);
+    state4 = in32;
+    diff = tmp1 - state6;
+    tmp2 = MUL_ACCUM_1(kResampleAllpass1[1], diff, state5);
+    state5 = tmp1;
+    diff = tmp2 - state7;
+    state7 = MUL_ACCUM_2(kResampleAllpass1[2], diff, state6);
+    state6 = tmp2;
+
+    // add two allpass outputs, divide by two and round
+    out32 = (state3 + state7 + 1024) >> 11;
+
+    // limit amplitude to prevent wrap-around, and write to output array
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+  }
+
+  filtState[0] = state0;
+  filtState[1] = state1;
+  filtState[2] = state2;
+  filtState[3] = state3;
+  filtState[4] = state4;
+  filtState[5] = state5;
+  filtState[6] = state6;
+  filtState[7] = state7;
+}
+#endif  // #if defined(MIPS32_LE)
+
+
+void WebRtcSpl_UpsampleBy2(const int16_t* in, size_t len,
+                           int16_t* out, int32_t* filtState) {
+  int32_t tmp1, tmp2, diff, in32, out32;
+  size_t i;
+
+  register int32_t state0 = filtState[0];
+  register int32_t state1 = filtState[1];
+  register int32_t state2 = filtState[2];
+  register int32_t state3 = filtState[3];
+  register int32_t state4 = filtState[4];
+  register int32_t state5 = filtState[5];
+  register int32_t state6 = filtState[6];
+  register int32_t state7 = filtState[7];
+
+  for (i = len; i > 0; i--) {
+    // lower allpass filter
+    in32 = (int32_t)(*in++) * (1 << 10);
+    diff = in32 - state1;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass1[0], diff, state0);
+    state0 = in32;
+    diff = tmp1 - state2;
+    tmp2 = MUL_ACCUM_1(kResampleAllpass1[1], diff, state1);
+    state1 = tmp1;
+    diff = tmp2 - state3;
+    state3 = MUL_ACCUM_2(kResampleAllpass1[2], diff, state2);
+    state2 = tmp2;
+
+    // round; limit amplitude to prevent wrap-around; write to output array
+    out32 = (state3 + 512) >> 10;
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+
+    // upper allpass filter
+    diff = in32 - state5;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass2[0], diff, state4);
+    state4 = in32;
+    diff = tmp1 - state6;
+    tmp2 = MUL_ACCUM_2(kResampleAllpass2[1], diff, state5);
+    state5 = tmp1;
+    diff = tmp2 - state7;
+    state7 = MUL_ACCUM_2(kResampleAllpass2[2], diff, state6);
+    state6 = tmp2;
+
+    // round; limit amplitude to prevent wrap-around; write to output array
+    out32 = (state7 + 512) >> 10;
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+  }
+
+  filtState[0] = state0;
+  filtState[1] = state1;
+  filtState[2] = state2;
+  filtState[3] = state3;
+  filtState[4] = state4;
+  filtState[5] = state5;
+  filtState[6] = state6;
+  filtState[7] = state7;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_internal.c b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_internal.c
new file mode 100644
index 0000000000..99592b20b5
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_internal.c
@@ -0,0 +1,689 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This header file contains some internal resampling functions.
+ *
+ */
+
+#include "common_audio/signal_processing/resample_by_2_internal.h"
+#include "rtc_base/sanitizer.h"
+
+// allpass filter coefficients.
+static const int16_t kResampleAllpass[2][3] = {
+        {821, 6110, 12382},
+        {3050, 9368, 15063}
+};
+
+//
+//   decimator
+// input:  int32_t (shifted 15 positions to the left, + offset 16384) OVERWRITTEN!
+// output: int16_t (saturated) (of length len/2)
+// state:  filter state array; length = 8
+
+void RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_DownBy2IntToShort(int32_t *in, int32_t len, int16_t *out,
+                            int32_t *state)
+{
+    int32_t tmp0, tmp1, diff;
+    int32_t i;
+
+    len >>= 1;
+
+    // lower allpass filter (operates on even input samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i << 1];
+        diff = tmp0 - state[1];
+        // UBSan: -1771017321 - 999586185 cannot be represented in type 'int'
+
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[0] + diff * kResampleAllpass[1][0];
+        state[0] = tmp0;
+        diff = tmp1 - state[2];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[1] + diff * kResampleAllpass[1][1];
+        state[1] = tmp1;
+        diff = tmp0 - state[3];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[3] = state[2] + diff * kResampleAllpass[1][2];
+        state[2] = tmp0;
+
+        // divide by two and store temporarily
+        in[i << 1] = (state[3] >> 1);
+    }
+
+    in++;
+
+    // upper allpass filter (operates on odd input samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i << 1];
+        diff = tmp0 - state[5];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[4] + diff * kResampleAllpass[0][0];
+        state[4] = tmp0;
+        diff = tmp1 - state[6];
+        // scale down and round
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[5] + diff * kResampleAllpass[0][1];
+        state[5] = tmp1;
+        diff = tmp0 - state[7];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[7] = state[6] + diff * kResampleAllpass[0][2];
+        state[6] = tmp0;
+
+        // divide by two and store temporarily
+        in[i << 1] = (state[7] >> 1);
+    }
+
+    in--;
+
+    // combine allpass outputs
+    for (i = 0; i < len; i += 2)
+    {
+        // divide by two, add both allpass outputs and round
+        tmp0 = (in[i << 1] + in[(i << 1) + 1]) >> 15;
+        tmp1 = (in[(i << 1) + 2] + in[(i << 1) + 3]) >> 15;
+        if (tmp0 > (int32_t)0x00007FFF)
+            tmp0 = 0x00007FFF;
+        if (tmp0 < (int32_t)0xFFFF8000)
+            tmp0 = 0xFFFF8000;
+        out[i] = (int16_t)tmp0;
+        if (tmp1 > (int32_t)0x00007FFF)
+            tmp1 = 0x00007FFF;
+        if (tmp1 < (int32_t)0xFFFF8000)
+            tmp1 = 0xFFFF8000;
+        out[i + 1] = (int16_t)tmp1;
+    }
+}
+
+//
+//   decimator
+// input:  int16_t
+// output: int32_t (shifted 15 positions to the left, + offset 16384) (of length len/2)
+// state:  filter state array; length = 8
+
+void RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_DownBy2ShortToInt(const int16_t *in,
+                            int32_t len,
+                            int32_t *out,
+                            int32_t *state)
+{
+    int32_t tmp0, tmp1, diff;
+    int32_t i;
+
+    len >>= 1;
+
+    // lower allpass filter (operates on even input samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = ((int32_t)in[i << 1] << 15) + (1 << 14);
+        diff = tmp0 - state[1];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[0] + diff * kResampleAllpass[1][0];
+        state[0] = tmp0;
+        diff = tmp1 - state[2];
+        // UBSan: -1379909682 - 834099714 cannot be represented in type 'int'
+
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[1] + diff * kResampleAllpass[1][1];
+        state[1] = tmp1;
+        diff = tmp0 - state[3];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[3] = state[2] + diff * kResampleAllpass[1][2];
+        state[2] = tmp0;
+
+        // divide by two and store temporarily
+        out[i] = (state[3] >> 1);
+    }
+
+    in++;
+
+    // upper allpass filter (operates on odd input samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = ((int32_t)in[i << 1] << 15) + (1 << 14);
+        diff = tmp0 - state[5];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[4] + diff * kResampleAllpass[0][0];
+        state[4] = tmp0;
+        diff = tmp1 - state[6];
+        // scale down and round
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[5] + diff * kResampleAllpass[0][1];
+        state[5] = tmp1;
+        diff = tmp0 - state[7];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[7] = state[6] + diff * kResampleAllpass[0][2];
+        state[6] = tmp0;
+
+        // divide by two and store temporarily
+        out[i] += (state[7] >> 1);
+    }
+
+    in--;
+}
+
+//
+//   interpolator
+// input:  int16_t
+// output: int32_t (normalized, not saturated) (of length len*2)
+// state:  filter state array; length = 8
+void WebRtcSpl_UpBy2ShortToInt(const int16_t *in, int32_t len, int32_t *out,
+                               int32_t *state)
+{
+    int32_t tmp0, tmp1, diff;
+    int32_t i;
+
+    // upper allpass filter (generates odd output samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = ((int32_t)in[i] << 15) + (1 << 14);
+        diff = tmp0 - state[5];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[4] + diff * kResampleAllpass[0][0];
+        state[4] = tmp0;
+        diff = tmp1 - state[6];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[5] + diff * kResampleAllpass[0][1];
+        state[5] = tmp1;
+        diff = tmp0 - state[7];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[7] = state[6] + diff * kResampleAllpass[0][2];
+        state[6] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[7] >> 15;
+    }
+
+    out++;
+
+    // lower allpass filter (generates even output samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = ((int32_t)in[i] << 15) + (1 << 14);
+        diff = tmp0 - state[1];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[0] + diff * kResampleAllpass[1][0];
+        state[0] = tmp0;
+        diff = tmp1 - state[2];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[1] + diff * kResampleAllpass[1][1];
+        state[1] = tmp1;
+        diff = tmp0 - state[3];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[3] = state[2] + diff * kResampleAllpass[1][2];
+        state[2] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[3] >> 15;
+    }
+}
+
+//
+//   interpolator
+// input:  int32_t (shifted 15 positions to the left, + offset 16384)
+// output: int32_t (shifted 15 positions to the left, + offset 16384) (of length len*2)
+// state:  filter state array; length = 8
+void WebRtcSpl_UpBy2IntToInt(const int32_t *in, int32_t len, int32_t *out,
+                             int32_t *state)
+{
+    int32_t tmp0, tmp1, diff;
+    int32_t i;
+
+    // upper allpass filter (generates odd output samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i];
+        diff = tmp0 - state[5];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[4] + diff * kResampleAllpass[0][0];
+        state[4] = tmp0;
+        diff = tmp1 - state[6];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[5] + diff * kResampleAllpass[0][1];
+        state[5] = tmp1;
+        diff = tmp0 - state[7];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[7] = state[6] + diff * kResampleAllpass[0][2];
+        state[6] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[7];
+    }
+
+    out++;
+
+    // lower allpass filter (generates even output samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i];
+        diff = tmp0 - state[1];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[0] + diff * kResampleAllpass[1][0];
+        state[0] = tmp0;
+        diff = tmp1 - state[2];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[1] + diff * kResampleAllpass[1][1];
+        state[1] = tmp1;
+        diff = tmp0 - state[3];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[3] = state[2] + diff * kResampleAllpass[1][2];
+        state[2] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[3];
+    }
+}
+
+//
+//   interpolator
+// input:  int32_t (shifted 15 positions to the left, + offset 16384)
+// output: int16_t (saturated) (of length len*2)
+// state:  filter state array; length = 8
+void WebRtcSpl_UpBy2IntToShort(const int32_t *in, int32_t len, int16_t *out,
+                               int32_t *state)
+{
+    int32_t tmp0, tmp1, diff;
+    int32_t i;
+
+    // upper allpass filter (generates odd output samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i];
+        diff = tmp0 - state[5];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[4] + diff * kResampleAllpass[0][0];
+        state[4] = tmp0;
+        diff = tmp1 - state[6];
+        // scale down and round
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[5] + diff * kResampleAllpass[0][1];
+        state[5] = tmp1;
+        diff = tmp0 - state[7];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[7] = state[6] + diff * kResampleAllpass[0][2];
+        state[6] = tmp0;
+
+        // scale down, saturate and store
+        tmp1 = state[7] >> 15;
+        if (tmp1 > (int32_t)0x00007FFF)
+            tmp1 = 0x00007FFF;
+        if (tmp1 < (int32_t)0xFFFF8000)
+            tmp1 = 0xFFFF8000;
+        out[i << 1] = (int16_t)tmp1;
+    }
+
+    out++;
+
+    // lower allpass filter (generates even output samples)
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i];
+        diff = tmp0 - state[1];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[0] + diff * kResampleAllpass[1][0];
+        state[0] = tmp0;
+        diff = tmp1 - state[2];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[1] + diff * kResampleAllpass[1][1];
+        state[1] = tmp1;
+        diff = tmp0 - state[3];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[3] = state[2] + diff * kResampleAllpass[1][2];
+        state[2] = tmp0;
+
+        // scale down, saturate and store
+        tmp1 = state[3] >> 15;
+        if (tmp1 > (int32_t)0x00007FFF)
+            tmp1 = 0x00007FFF;
+        if (tmp1 < (int32_t)0xFFFF8000)
+            tmp1 = 0xFFFF8000;
+        out[i << 1] = (int16_t)tmp1;
+    }
+}
+
+//   lowpass filter
+// input:  int16_t
+// output: int32_t (normalized, not saturated)
+// state:  filter state array; length = 8
+void WebRtcSpl_LPBy2ShortToInt(const int16_t* in, int32_t len, int32_t* out,
+                               int32_t* state)
+{
+    int32_t tmp0, tmp1, diff;
+    int32_t i;
+
+    len >>= 1;
+
+    // lower allpass filter: odd input -> even output samples
+    in++;
+    // initial state of polyphase delay element
+    tmp0 = state[12];
+    for (i = 0; i < len; i++)
+    {
+        diff = tmp0 - state[1];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[0] + diff * kResampleAllpass[1][0];
+        state[0] = tmp0;
+        diff = tmp1 - state[2];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[1] + diff * kResampleAllpass[1][1];
+        state[1] = tmp1;
+        diff = tmp0 - state[3];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[3] = state[2] + diff * kResampleAllpass[1][2];
+        state[2] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[3] >> 1;
+        tmp0 = ((int32_t)in[i << 1] << 15) + (1 << 14);
+    }
+    in--;
+
+    // upper allpass filter: even input -> even output samples
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = ((int32_t)in[i << 1] << 15) + (1 << 14);
+        diff = tmp0 - state[5];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[4] + diff * kResampleAllpass[0][0];
+        state[4] = tmp0;
+        diff = tmp1 - state[6];
+        // scale down and round
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[5] + diff * kResampleAllpass[0][1];
+        state[5] = tmp1;
+        diff = tmp0 - state[7];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[7] = state[6] + diff * kResampleAllpass[0][2];
+        state[6] = tmp0;
+
+        // average the two allpass outputs, scale down and store
+        out[i << 1] = (out[i << 1] + (state[7] >> 1)) >> 15;
+    }
+
+    // switch to odd output samples
+    out++;
+
+    // lower allpass filter: even input -> odd output samples
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = ((int32_t)in[i << 1] << 15) + (1 << 14);
+        diff = tmp0 - state[9];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[8] + diff * kResampleAllpass[1][0];
+        state[8] = tmp0;
+        diff = tmp1 - state[10];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[9] + diff * kResampleAllpass[1][1];
+        state[9] = tmp1;
+        diff = tmp0 - state[11];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[11] = state[10] + diff * kResampleAllpass[1][2];
+        state[10] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[11] >> 1;
+    }
+
+    // upper allpass filter: odd input -> odd output samples
+    in++;
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = ((int32_t)in[i << 1] << 15) + (1 << 14);
+        diff = tmp0 - state[13];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[12] + diff * kResampleAllpass[0][0];
+        state[12] = tmp0;
+        diff = tmp1 - state[14];
+        // scale down and round
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[13] + diff * kResampleAllpass[0][1];
+        state[13] = tmp1;
+        diff = tmp0 - state[15];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[15] = state[14] + diff * kResampleAllpass[0][2];
+        state[14] = tmp0;
+
+        // average the two allpass outputs, scale down and store
+        out[i << 1] = (out[i << 1] + (state[15] >> 1)) >> 15;
+    }
+}
+
+//   lowpass filter
+// input:  int32_t (shifted 15 positions to the left, + offset 16384)
+// output: int32_t (normalized, not saturated)
+// state:  filter state array; length = 8
+void RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_LPBy2IntToInt(const int32_t* in, int32_t len, int32_t* out,
+                        int32_t* state)
+{
+    int32_t tmp0, tmp1, diff;
+    int32_t i;
+
+    len >>= 1;
+
+    // lower allpass filter: odd input -> even output samples
+    in++;
+    // initial state of polyphase delay element
+    tmp0 = state[12];
+    for (i = 0; i < len; i++)
+    {
+        diff = tmp0 - state[1];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[0] + diff * kResampleAllpass[1][0];
+        state[0] = tmp0;
+        diff = tmp1 - state[2];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[1] + diff * kResampleAllpass[1][1];
+        state[1] = tmp1;
+        diff = tmp0 - state[3];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[3] = state[2] + diff * kResampleAllpass[1][2];
+        state[2] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[3] >> 1;
+        tmp0 = in[i << 1];
+    }
+    in--;
+
+    // upper allpass filter: even input -> even output samples
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i << 1];
+        diff = tmp0 - state[5];
+        // UBSan: -794814117 - 1566149201 cannot be represented in type 'int'
+
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[4] + diff * kResampleAllpass[0][0];
+        state[4] = tmp0;
+        diff = tmp1 - state[6];
+        // scale down and round
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[5] + diff * kResampleAllpass[0][1];
+        state[5] = tmp1;
+        diff = tmp0 - state[7];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[7] = state[6] + diff * kResampleAllpass[0][2];
+        state[6] = tmp0;
+
+        // average the two allpass outputs, scale down and store
+        out[i << 1] = (out[i << 1] + (state[7] >> 1)) >> 15;
+    }
+
+    // switch to odd output samples
+    out++;
+
+    // lower allpass filter: even input -> odd output samples
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i << 1];
+        diff = tmp0 - state[9];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[8] + diff * kResampleAllpass[1][0];
+        state[8] = tmp0;
+        diff = tmp1 - state[10];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[9] + diff * kResampleAllpass[1][1];
+        state[9] = tmp1;
+        diff = tmp0 - state[11];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[11] = state[10] + diff * kResampleAllpass[1][2];
+        state[10] = tmp0;
+
+        // scale down, round and store
+        out[i << 1] = state[11] >> 1;
+    }
+
+    // upper allpass filter: odd input -> odd output samples
+    in++;
+    for (i = 0; i < len; i++)
+    {
+        tmp0 = in[i << 1];
+        diff = tmp0 - state[13];
+        // scale down and round
+        diff = (diff + (1 << 13)) >> 14;
+        tmp1 = state[12] + diff * kResampleAllpass[0][0];
+        state[12] = tmp0;
+        diff = tmp1 - state[14];
+        // scale down and round
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        tmp0 = state[13] + diff * kResampleAllpass[0][1];
+        state[13] = tmp1;
+        diff = tmp0 - state[15];
+        // scale down and truncate
+        diff = diff >> 14;
+        if (diff < 0)
+            diff += 1;
+        state[15] = state[14] + diff * kResampleAllpass[0][2];
+        state[14] = tmp0;
+
+        // average the two allpass outputs, scale down and store
+        out[i << 1] = (out[i << 1] + (state[15] >> 1)) >> 15;
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_internal.h b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_internal.h
new file mode 100644
index 0000000000..145395a4cb
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_internal.h
@@ -0,0 +1,60 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This header file contains some internal resampling functions.
+ *
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_RESAMPLE_BY_2_INTERNAL_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_RESAMPLE_BY_2_INTERNAL_H_
+
+#include <stdint.h>
+
+/*******************************************************************
+ * resample_by_2_fast.c
+ * Functions for internal use in the other resample functions
+ ******************************************************************/
+void WebRtcSpl_DownBy2IntToShort(int32_t* in,
+                                 int32_t len,
+                                 int16_t* out,
+                                 int32_t* state);
+
+void WebRtcSpl_DownBy2ShortToInt(const int16_t* in,
+                                 int32_t len,
+                                 int32_t* out,
+                                 int32_t* state);
+
+void WebRtcSpl_UpBy2ShortToInt(const int16_t* in,
+                               int32_t len,
+                               int32_t* out,
+                               int32_t* state);
+
+void WebRtcSpl_UpBy2IntToInt(const int32_t* in,
+                             int32_t len,
+                             int32_t* out,
+                             int32_t* state);
+
+void WebRtcSpl_UpBy2IntToShort(const int32_t* in,
+                               int32_t len,
+                               int16_t* out,
+                               int32_t* state);
+
+void WebRtcSpl_LPBy2ShortToInt(const int16_t* in,
+                               int32_t len,
+                               int32_t* out,
+                               int32_t* state);
+
+void WebRtcSpl_LPBy2IntToInt(const int32_t* in,
+                             int32_t len,
+                             int32_t* out,
+                             int32_t* state);
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_RESAMPLE_BY_2_INTERNAL_H_
diff --git a/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_mips.c b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_mips.c
new file mode 100644
index 0000000000..f41bab7519
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/resample_by_2_mips.c
@@ -0,0 +1,292 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the resampling by two functions.
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#if defined(MIPS32_LE)
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+#if !defined(MIPS_DSP_R2_LE)
+// allpass filter coefficients.
+static const uint16_t kResampleAllpass1[3] = {3284, 24441, 49528};
+static const uint16_t kResampleAllpass2[3] = {12199, 37471, 60255};
+#endif
+
+// Multiply a 32-bit value with a 16-bit value and accumulate to another input:
+#define MUL_ACCUM_1(a, b, c) WEBRTC_SPL_SCALEDIFF32(a, b, c)
+#define MUL_ACCUM_2(a, b, c) WEBRTC_SPL_SCALEDIFF32(a, b, c)
+
+// decimator
+void WebRtcSpl_DownsampleBy2(const int16_t* in,
+                             size_t len,
+                             int16_t* out,
+                             int32_t* filtState) {
+  int32_t out32;
+  size_t i, len1;
+
+  register int32_t state0 = filtState[0];
+  register int32_t state1 = filtState[1];
+  register int32_t state2 = filtState[2];
+  register int32_t state3 = filtState[3];
+  register int32_t state4 = filtState[4];
+  register int32_t state5 = filtState[5];
+  register int32_t state6 = filtState[6];
+  register int32_t state7 = filtState[7];
+
+#if defined(MIPS_DSP_R2_LE)
+  int32_t k1Res0, k1Res1, k1Res2, k2Res0, k2Res1, k2Res2;
+
+  k1Res0= 3284;
+  k1Res1= 24441;
+  k1Res2= 49528;
+  k2Res0= 12199;
+  k2Res1= 37471;
+  k2Res2= 60255;
+  len1 = (len >> 1);
+
+  const int32_t* inw = (int32_t*)in;
+  int32_t tmp11, tmp12, tmp21, tmp22;
+  int32_t in322, in321;
+  int32_t diff1, diff2;
+  for (i = len1; i > 0; i--) {
+    __asm__ volatile (
+      "lh         %[in321],    0(%[inw])                  \n\t"
+      "lh         %[in322],    2(%[inw])                  \n\t"
+
+      "sll        %[in321],    %[in321],      10          \n\t"
+      "sll        %[in322],    %[in322],      10          \n\t"
+
+      "addiu      %[inw],      %[inw],        4           \n\t"
+
+      "subu       %[diff1],    %[in321],      %[state1]   \n\t"
+      "subu       %[diff2],    %[in322],      %[state5]   \n\t"
+
+      : [in322] "=&r" (in322), [in321] "=&r" (in321),
+        [diff1] "=&r" (diff1), [diff2] "=r" (diff2), [inw] "+r" (inw)
+      : [state1] "r" (state1), [state5] "r" (state5)
+      : "memory"
+    );
+
+    __asm__ volatile (
+      "mult       $ac0,       %[diff1],       %[k2Res0]   \n\t"
+      "mult       $ac1,       %[diff2],       %[k1Res0]   \n\t"
+
+      "extr.w     %[tmp11],   $ac0,           16          \n\t"
+      "extr.w     %[tmp12],   $ac1,           16          \n\t"
+
+      "addu       %[tmp11],   %[state0],      %[tmp11]    \n\t"
+      "addu       %[tmp12],   %[state4],      %[tmp12]    \n\t"
+
+      "addiu      %[state0],  %[in321],       0           \n\t"
+      "addiu      %[state4],  %[in322],       0           \n\t"
+
+      "subu       %[diff1],   %[tmp11],       %[state2]   \n\t"
+      "subu       %[diff2],   %[tmp12],       %[state6]   \n\t"
+
+      "mult       $ac0,       %[diff1],       %[k2Res1]   \n\t"
+      "mult       $ac1,       %[diff2],       %[k1Res1]   \n\t"
+
+      "extr.w     %[tmp21],   $ac0,           16          \n\t"
+      "extr.w     %[tmp22],   $ac1,           16          \n\t"
+
+      "addu       %[tmp21],   %[state1],      %[tmp21]    \n\t"
+      "addu       %[tmp22],   %[state5],      %[tmp22]    \n\t"
+
+      "addiu      %[state1],  %[tmp11],       0           \n\t"
+      "addiu      %[state5],  %[tmp12],       0           \n\t"
+      : [tmp22] "=r" (tmp22), [tmp21] "=&r" (tmp21),
+        [tmp11] "=&r" (tmp11), [state0] "+r" (state0),
+        [state1] "+r" (state1),
+        [state2] "+r" (state2),
+        [state4] "+r" (state4), [tmp12] "=&r" (tmp12),
+        [state6] "+r" (state6), [state5] "+r" (state5)
+      : [k1Res1] "r" (k1Res1), [k2Res1] "r" (k2Res1), [k2Res0] "r" (k2Res0),
+        [diff2] "r" (diff2), [diff1] "r" (diff1), [in322] "r" (in322),
+        [in321] "r" (in321), [k1Res0] "r" (k1Res0)
+      : "hi", "lo", "$ac1hi", "$ac1lo"
+    );
+
+    // upper allpass filter
+    __asm__ volatile (
+      "subu       %[diff1],   %[tmp21],       %[state3]   \n\t"
+      "subu       %[diff2],   %[tmp22],       %[state7]   \n\t"
+
+      "mult       $ac0,       %[diff1],       %[k2Res2]   \n\t"
+      "mult       $ac1,       %[diff2],       %[k1Res2]   \n\t"
+      "extr.w     %[state3],  $ac0,           16          \n\t"
+      "extr.w     %[state7],  $ac1,           16          \n\t"
+      "addu       %[state3],  %[state2],      %[state3]   \n\t"
+      "addu       %[state7],  %[state6],      %[state7]   \n\t"
+
+      "addiu      %[state2],  %[tmp21],       0           \n\t"
+      "addiu      %[state6],  %[tmp22],       0           \n\t"
+
+      // add two allpass outputs, divide by two and round
+      "addu       %[out32],   %[state3],      %[state7]   \n\t"
+      "addiu      %[out32],   %[out32],       1024        \n\t"
+      "sra        %[out32],   %[out32],       11          \n\t"
+      : [state3] "+r" (state3), [state6] "+r" (state6),
+        [state2] "+r" (state2), [diff2] "=&r" (diff2),
+        [out32] "=r" (out32), [diff1] "=&r" (diff1), [state7] "+r" (state7)
+      : [tmp22] "r" (tmp22), [tmp21] "r" (tmp21),
+        [k1Res2] "r" (k1Res2), [k2Res2] "r" (k2Res2)
+      : "hi", "lo", "$ac1hi", "$ac1lo"
+    );
+
+    // limit amplitude to prevent wrap-around, and write to output array
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+  }
+#else  // #if defined(MIPS_DSP_R2_LE)
+  int32_t tmp1, tmp2, diff;
+  int32_t in32;
+  len1 = (len >> 1)/4;
+  for (i = len1; i > 0; i--) {
+    // lower allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state1;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass2[0], diff, state0);
+    state0 = in32;
+    diff = tmp1 - state2;
+    tmp2 = MUL_ACCUM_2(kResampleAllpass2[1], diff, state1);
+    state1 = tmp1;
+    diff = tmp2 - state3;
+    state3 = MUL_ACCUM_2(kResampleAllpass2[2], diff, state2);
+    state2 = tmp2;
+
+    // upper allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state5;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass1[0], diff, state4);
+    state4 = in32;
+    diff = tmp1 - state6;
+    tmp2 = MUL_ACCUM_1(kResampleAllpass1[1], diff, state5);
+    state5 = tmp1;
+    diff = tmp2 - state7;
+    state7 = MUL_ACCUM_2(kResampleAllpass1[2], diff, state6);
+    state6 = tmp2;
+
+    // add two allpass outputs, divide by two and round
+    out32 = (state3 + state7 + 1024) >> 11;
+
+    // limit amplitude to prevent wrap-around, and write to output array
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+    // lower allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state1;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass2[0], diff, state0);
+    state0 = in32;
+    diff = tmp1 - state2;
+    tmp2 = MUL_ACCUM_2(kResampleAllpass2[1], diff, state1);
+    state1 = tmp1;
+    diff = tmp2 - state3;
+    state3 = MUL_ACCUM_2(kResampleAllpass2[2], diff, state2);
+    state2 = tmp2;
+
+    // upper allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state5;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass1[0], diff, state4);
+    state4 = in32;
+    diff = tmp1 - state6;
+    tmp2 = MUL_ACCUM_1(kResampleAllpass1[1], diff, state5);
+    state5 = tmp1;
+    diff = tmp2 - state7;
+    state7 = MUL_ACCUM_2(kResampleAllpass1[2], diff, state6);
+    state6 = tmp2;
+
+    // add two allpass outputs, divide by two and round
+    out32 = (state3 + state7 + 1024) >> 11;
+
+    // limit amplitude to prevent wrap-around, and write to output array
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+    // lower allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state1;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass2[0], diff, state0);
+    state0 = in32;
+    diff = tmp1 - state2;
+    tmp2 = MUL_ACCUM_2(kResampleAllpass2[1], diff, state1);
+    state1 = tmp1;
+    diff = tmp2 - state3;
+    state3 = MUL_ACCUM_2(kResampleAllpass2[2], diff, state2);
+    state2 = tmp2;
+
+    // upper allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state5;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass1[0], diff, state4);
+    state4 = in32;
+    diff = tmp1 - state6;
+    tmp2 = MUL_ACCUM_1(kResampleAllpass1[1], diff, state5);
+    state5 = tmp1;
+    diff = tmp2 - state7;
+    state7 = MUL_ACCUM_2(kResampleAllpass1[2], diff, state6);
+    state6 = tmp2;
+
+    // add two allpass outputs, divide by two and round
+    out32 = (state3 + state7 + 1024) >> 11;
+
+    // limit amplitude to prevent wrap-around, and write to output array
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+    // lower allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state1;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass2[0], diff, state0);
+    state0 = in32;
+    diff = tmp1 - state2;
+    tmp2 = MUL_ACCUM_2(kResampleAllpass2[1], diff, state1);
+    state1 = tmp1;
+    diff = tmp2 - state3;
+    state3 = MUL_ACCUM_2(kResampleAllpass2[2], diff, state2);
+    state2 = tmp2;
+
+    // upper allpass filter
+    in32 = (int32_t)(*in++) << 10;
+    diff = in32 - state5;
+    tmp1 = MUL_ACCUM_1(kResampleAllpass1[0], diff, state4);
+    state4 = in32;
+    diff = tmp1 - state6;
+    tmp2 = MUL_ACCUM_1(kResampleAllpass1[1], diff, state5);
+    state5 = tmp1;
+    diff = tmp2 - state7;
+    state7 = MUL_ACCUM_2(kResampleAllpass1[2], diff, state6);
+    state6 = tmp2;
+
+    // add two allpass outputs, divide by two and round
+    out32 = (state3 + state7 + 1024) >> 11;
+
+    // limit amplitude to prevent wrap-around, and write to output array
+    *out++ = WebRtcSpl_SatW32ToW16(out32);
+  }
+#endif  // #if defined(MIPS_DSP_R2_LE)
+  __asm__ volatile (
+    "sw       %[state0],      0(%[filtState])     \n\t"
+    "sw       %[state1],      4(%[filtState])     \n\t"
+    "sw       %[state2],      8(%[filtState])     \n\t"
+    "sw       %[state3],      12(%[filtState])    \n\t"
+    "sw       %[state4],      16(%[filtState])    \n\t"
+    "sw       %[state5],      20(%[filtState])    \n\t"
+    "sw       %[state6],      24(%[filtState])    \n\t"
+    "sw       %[state7],      28(%[filtState])    \n\t"
+    :
+    : [state0] "r" (state0), [state1] "r" (state1), [state2] "r" (state2),
+      [state3] "r" (state3), [state4] "r" (state4), [state5] "r" (state5),
+      [state6] "r" (state6), [state7] "r" (state7), [filtState] "r" (filtState)
+    : "memory"
+  );
+}
+
+#endif  // #if defined(MIPS32_LE)
diff --git a/third_party/libwebrtc/common_audio/signal_processing/resample_fractional.c b/third_party/libwebrtc/common_audio/signal_processing/resample_fractional.c
new file mode 100644
index 0000000000..9ffe0aca60
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/resample_fractional.c
@@ -0,0 +1,239 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the resampling functions between 48, 44, 32 and 24 kHz.
+ * The description headers can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// interpolation coefficients
+static const int16_t kCoefficients48To32[2][8] = {
+        {778, -2050, 1087, 23285, 12903, -3783, 441, 222},
+        {222, 441, -3783, 12903, 23285, 1087, -2050, 778}
+};
+
+static const int16_t kCoefficients32To24[3][8] = {
+        {767, -2362, 2434, 24406, 10620, -3838, 721, 90},
+        {386, -381, -2646, 19062, 19062, -2646, -381, 386},
+        {90, 721, -3838, 10620, 24406, 2434, -2362, 767}
+};
+
+static const int16_t kCoefficients44To32[4][9] = {
+        {117, -669, 2245, -6183, 26267, 13529, -3245, 845, -138},
+        {-101, 612, -2283, 8532, 29790, -5138, 1789, -524, 91},
+        {50, -292, 1016, -3064, 32010, 3933, -1147, 315, -53},
+        {-156, 974, -3863, 18603, 21691, -6246, 2353, -712, 126}
+};
+
+//   Resampling ratio: 2/3
+// input:  int32_t (normalized, not saturated) :: size 3 * K
+// output: int32_t (shifted 15 positions to the left, + offset 16384) :: size 2 * K
+//      K: number of blocks
+
+void WebRtcSpl_Resample48khzTo32khz(const int32_t *In, int32_t *Out, size_t K)
+{
+    /////////////////////////////////////////////////////////////
+    // Filter operation:
+    //
+    // Perform resampling (3 input samples -> 2 output samples);
+    // process in sub blocks of size 3 samples.
+    int32_t tmp;
+    size_t m;
+
+    for (m = 0; m < K; m++)
+    {
+        tmp = 1 << 14;
+        tmp += kCoefficients48To32[0][0] * In[0];
+        tmp += kCoefficients48To32[0][1] * In[1];
+        tmp += kCoefficients48To32[0][2] * In[2];
+        tmp += kCoefficients48To32[0][3] * In[3];
+        tmp += kCoefficients48To32[0][4] * In[4];
+        tmp += kCoefficients48To32[0][5] * In[5];
+        tmp += kCoefficients48To32[0][6] * In[6];
+        tmp += kCoefficients48To32[0][7] * In[7];
+        Out[0] = tmp;
+
+        tmp = 1 << 14;
+        tmp += kCoefficients48To32[1][0] * In[1];
+        tmp += kCoefficients48To32[1][1] * In[2];
+        tmp += kCoefficients48To32[1][2] * In[3];
+        tmp += kCoefficients48To32[1][3] * In[4];
+        tmp += kCoefficients48To32[1][4] * In[5];
+        tmp += kCoefficients48To32[1][5] * In[6];
+        tmp += kCoefficients48To32[1][6] * In[7];
+        tmp += kCoefficients48To32[1][7] * In[8];
+        Out[1] = tmp;
+
+        // update pointers
+        In += 3;
+        Out += 2;
+    }
+}
+
+//   Resampling ratio: 3/4
+// input:  int32_t (normalized, not saturated) :: size 4 * K
+// output: int32_t (shifted 15 positions to the left, + offset 16384) :: size 3 * K
+//      K: number of blocks
+
+void WebRtcSpl_Resample32khzTo24khz(const int32_t *In, int32_t *Out, size_t K)
+{
+    /////////////////////////////////////////////////////////////
+    // Filter operation:
+    //
+    // Perform resampling (4 input samples -> 3 output samples);
+    // process in sub blocks of size 4 samples.
+    size_t m;
+    int32_t tmp;
+
+    for (m = 0; m < K; m++)
+    {
+        tmp = 1 << 14;
+        tmp += kCoefficients32To24[0][0] * In[0];
+        tmp += kCoefficients32To24[0][1] * In[1];
+        tmp += kCoefficients32To24[0][2] * In[2];
+        tmp += kCoefficients32To24[0][3] * In[3];
+        tmp += kCoefficients32To24[0][4] * In[4];
+        tmp += kCoefficients32To24[0][5] * In[5];
+        tmp += kCoefficients32To24[0][6] * In[6];
+        tmp += kCoefficients32To24[0][7] * In[7];
+        Out[0] = tmp;
+
+        tmp = 1 << 14;
+        tmp += kCoefficients32To24[1][0] * In[1];
+        tmp += kCoefficients32To24[1][1] * In[2];
+        tmp += kCoefficients32To24[1][2] * In[3];
+        tmp += kCoefficients32To24[1][3] * In[4];
+        tmp += kCoefficients32To24[1][4] * In[5];
+        tmp += kCoefficients32To24[1][5] * In[6];
+        tmp += kCoefficients32To24[1][6] * In[7];
+        tmp += kCoefficients32To24[1][7] * In[8];
+        Out[1] = tmp;
+
+        tmp = 1 << 14;
+        tmp += kCoefficients32To24[2][0] * In[2];
+        tmp += kCoefficients32To24[2][1] * In[3];
+        tmp += kCoefficients32To24[2][2] * In[4];
+        tmp += kCoefficients32To24[2][3] * In[5];
+        tmp += kCoefficients32To24[2][4] * In[6];
+        tmp += kCoefficients32To24[2][5] * In[7];
+        tmp += kCoefficients32To24[2][6] * In[8];
+        tmp += kCoefficients32To24[2][7] * In[9];
+        Out[2] = tmp;
+
+        // update pointers
+        In += 4;
+        Out += 3;
+    }
+}
+
+//
+// fractional resampling filters
+//   Fout = 11/16 * Fin
+//   Fout =  8/11 * Fin
+//
+
+// compute two inner-products and store them to output array
+static void WebRtcSpl_ResampDotProduct(const int32_t *in1, const int32_t *in2,
+                                       const int16_t *coef_ptr, int32_t *out1,
+                                       int32_t *out2)
+{
+    int32_t tmp1 = 16384;
+    int32_t tmp2 = 16384;
+    int16_t coef;
+
+    coef = coef_ptr[0];
+    tmp1 += coef * in1[0];
+    tmp2 += coef * in2[-0];
+
+    coef = coef_ptr[1];
+    tmp1 += coef * in1[1];
+    tmp2 += coef * in2[-1];
+
+    coef = coef_ptr[2];
+    tmp1 += coef * in1[2];
+    tmp2 += coef * in2[-2];
+
+    coef = coef_ptr[3];
+    tmp1 += coef * in1[3];
+    tmp2 += coef * in2[-3];
+
+    coef = coef_ptr[4];
+    tmp1 += coef * in1[4];
+    tmp2 += coef * in2[-4];
+
+    coef = coef_ptr[5];
+    tmp1 += coef * in1[5];
+    tmp2 += coef * in2[-5];
+
+    coef = coef_ptr[6];
+    tmp1 += coef * in1[6];
+    tmp2 += coef * in2[-6];
+
+    coef = coef_ptr[7];
+    tmp1 += coef * in1[7];
+    tmp2 += coef * in2[-7];
+
+    coef = coef_ptr[8];
+    *out1 = tmp1 + coef * in1[8];
+    *out2 = tmp2 + coef * in2[-8];
+}
+
+//   Resampling ratio: 8/11
+// input:  int32_t (normalized, not saturated) :: size 11 * K
+// output: int32_t (shifted 15 positions to the left, + offset 16384) :: size  8 * K
+//      K: number of blocks
+
+void WebRtcSpl_Resample44khzTo32khz(const int32_t *In, int32_t *Out, size_t K)
+{
+    /////////////////////////////////////////////////////////////
+    // Filter operation:
+    //
+    // Perform resampling (11 input samples -> 8 output samples);
+    // process in sub blocks of size 11 samples.
+    int32_t tmp;
+    size_t m;
+
+    for (m = 0; m < K; m++)
+    {
+        tmp = 1 << 14;
+
+        // first output sample
+        Out[0] = ((int32_t)In[3] << 15) + tmp;
+
+        // sum and accumulate filter coefficients and input samples
+        tmp += kCoefficients44To32[3][0] * In[5];
+        tmp += kCoefficients44To32[3][1] * In[6];
+        tmp += kCoefficients44To32[3][2] * In[7];
+        tmp += kCoefficients44To32[3][3] * In[8];
+        tmp += kCoefficients44To32[3][4] * In[9];
+        tmp += kCoefficients44To32[3][5] * In[10];
+        tmp += kCoefficients44To32[3][6] * In[11];
+        tmp += kCoefficients44To32[3][7] * In[12];
+        tmp += kCoefficients44To32[3][8] * In[13];
+        Out[4] = tmp;
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_ResampDotProduct(&In[0], &In[17], kCoefficients44To32[0], &Out[1], &Out[7]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_ResampDotProduct(&In[2], &In[15], kCoefficients44To32[1], &Out[2], &Out[6]);
+
+        // sum and accumulate filter coefficients and input samples
+        WebRtcSpl_ResampDotProduct(&In[3], &In[14], kCoefficients44To32[2], &Out[3], &Out[5]);
+
+        // update pointers
+        In += 11;
+        Out += 8;
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/signal_processing_unittest.cc b/third_party/libwebrtc/common_audio/signal_processing/signal_processing_unittest.cc
new file mode 100644
index 0000000000..80d605bc0b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/signal_processing_unittest.cc
@@ -0,0 +1,668 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <algorithm>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "rtc_base/strings/string_builder.h"
+#include "test/gtest.h"
+
+static const size_t kVector16Size = 9;
+static const int16_t vector16[kVector16Size] = {1,
+                                                -15511,
+                                                4323,
+                                                1963,
+                                                WEBRTC_SPL_WORD16_MAX,
+                                                0,
+                                                WEBRTC_SPL_WORD16_MIN + 5,
+                                                -3333,
+                                                345};
+
+TEST(SplTest, MacroTest) {
+  // Macros with inputs.
+  int A = 10;
+  int B = 21;
+  int a = -3;
+  int b = WEBRTC_SPL_WORD32_MAX;
+
+  EXPECT_EQ(10, WEBRTC_SPL_MIN(A, B));
+  EXPECT_EQ(21, WEBRTC_SPL_MAX(A, B));
+
+  EXPECT_EQ(3, WEBRTC_SPL_ABS_W16(a));
+  EXPECT_EQ(3, WEBRTC_SPL_ABS_W32(a));
+
+  EXPECT_EQ(-63, WEBRTC_SPL_MUL(a, B));
+  EXPECT_EQ(2147483651u, WEBRTC_SPL_UMUL(a, b));
+  b = WEBRTC_SPL_WORD16_MAX >> 1;
+  EXPECT_EQ(4294918147u, WEBRTC_SPL_UMUL_32_16(a, b));
+  EXPECT_EQ(-49149, WEBRTC_SPL_MUL_16_U16(a, b));
+
+  a = b;
+  b = -3;
+
+  EXPECT_EQ(-1, WEBRTC_SPL_MUL_16_32_RSFT16(a, b));
+  EXPECT_EQ(-1, WEBRTC_SPL_MUL_16_32_RSFT15(a, b));
+  EXPECT_EQ(-3, WEBRTC_SPL_MUL_16_32_RSFT14(a, b));
+  EXPECT_EQ(-24, WEBRTC_SPL_MUL_16_32_RSFT11(a, b));
+
+  EXPECT_EQ(-12288, WEBRTC_SPL_MUL_16_16_RSFT(a, b, 2));
+  EXPECT_EQ(-12287, WEBRTC_SPL_MUL_16_16_RSFT_WITH_ROUND(a, b, 2));
+
+  EXPECT_EQ(21, WEBRTC_SPL_SAT(a, A, B));
+  EXPECT_EQ(21, WEBRTC_SPL_SAT(a, B, A));
+
+  // Shifting with negative numbers allowed
+  int shift_amount = 1;  // Workaround compiler warning using variable here.
+  // Positive means left shift
+  EXPECT_EQ(32766, WEBRTC_SPL_SHIFT_W32(a, shift_amount));
+
+  // Shifting with negative numbers not allowed
+  // We cannot do casting here due to signed/unsigned problem
+  EXPECT_EQ(32766, WEBRTC_SPL_LSHIFT_W32(a, 1));
+
+  EXPECT_EQ(8191u, WEBRTC_SPL_RSHIFT_U32(a, 1));
+
+  EXPECT_EQ(1470, WEBRTC_SPL_RAND(A));
+
+  EXPECT_EQ(-49149, WEBRTC_SPL_MUL_16_16(a, b));
+  EXPECT_EQ(1073676289,
+            WEBRTC_SPL_MUL_16_16(WEBRTC_SPL_WORD16_MAX, WEBRTC_SPL_WORD16_MAX));
+  EXPECT_EQ(1073709055, WEBRTC_SPL_MUL_16_32_RSFT16(WEBRTC_SPL_WORD16_MAX,
+                                                    WEBRTC_SPL_WORD32_MAX));
+  EXPECT_EQ(1073741824, WEBRTC_SPL_MUL_16_32_RSFT16(WEBRTC_SPL_WORD16_MIN,
+                                                    WEBRTC_SPL_WORD32_MIN));
+#ifdef WEBRTC_ARCH_ARM_V7
+  EXPECT_EQ(-1073741824, WEBRTC_SPL_MUL_16_32_RSFT16(WEBRTC_SPL_WORD16_MIN,
+                                                     WEBRTC_SPL_WORD32_MAX));
+#else
+  EXPECT_EQ(-1073741823, WEBRTC_SPL_MUL_16_32_RSFT16(WEBRTC_SPL_WORD16_MIN,
+                                                     WEBRTC_SPL_WORD32_MAX));
+#endif
+}
+
+TEST(SplTest, InlineTest) {
+  int16_t a16 = 121;
+  int16_t b16 = -17;
+  int32_t a32 = 111121;
+  int32_t b32 = -1711;
+
+  EXPECT_EQ(17, WebRtcSpl_GetSizeInBits(a32));
+
+  EXPECT_EQ(0, WebRtcSpl_NormW32(0));
+  EXPECT_EQ(31, WebRtcSpl_NormW32(-1));
+  EXPECT_EQ(0, WebRtcSpl_NormW32(WEBRTC_SPL_WORD32_MIN));
+  EXPECT_EQ(14, WebRtcSpl_NormW32(a32));
+
+  EXPECT_EQ(0, WebRtcSpl_NormW16(0));
+  EXPECT_EQ(15, WebRtcSpl_NormW16(-1));
+  EXPECT_EQ(0, WebRtcSpl_NormW16(WEBRTC_SPL_WORD16_MIN));
+  EXPECT_EQ(4, WebRtcSpl_NormW16(b32));
+  for (int ii = 0; ii < 15; ++ii) {
+    int16_t value = 1 << ii;
+    EXPECT_EQ(14 - ii, WebRtcSpl_NormW16(value));
+    EXPECT_EQ(15 - ii, WebRtcSpl_NormW16(-value));
+  }
+
+  EXPECT_EQ(0, WebRtcSpl_NormU32(0u));
+  EXPECT_EQ(0, WebRtcSpl_NormU32(0xffffffff));
+  EXPECT_EQ(15, WebRtcSpl_NormU32(static_cast<uint32_t>(a32)));
+
+  EXPECT_EQ(104, WebRtcSpl_AddSatW16(a16, b16));
+  EXPECT_EQ(138, WebRtcSpl_SubSatW16(a16, b16));
+}
+
+TEST(SplTest, AddSubSatW32) {
+  static constexpr int32_t kAddSubArgs[] = {
+      INT32_MIN, INT32_MIN + 1, -3,       -2, -1, 0, 1, -1, 2,
+      3,         INT32_MAX - 1, INT32_MAX};
+  for (int32_t a : kAddSubArgs) {
+    for (int32_t b : kAddSubArgs) {
+      const int64_t sum = std::max<int64_t>(
+          INT32_MIN, std::min<int64_t>(INT32_MAX, static_cast<int64_t>(a) + b));
+      const int64_t diff = std::max<int64_t>(
+          INT32_MIN, std::min<int64_t>(INT32_MAX, static_cast<int64_t>(a) - b));
+      rtc::StringBuilder ss;
+      ss << a << " +/- " << b << ": sum " << sum << ", diff " << diff;
+      SCOPED_TRACE(ss.str());
+      EXPECT_EQ(sum, WebRtcSpl_AddSatW32(a, b));
+      EXPECT_EQ(diff, WebRtcSpl_SubSatW32(a, b));
+    }
+  }
+}
+
+TEST(SplTest, CountLeadingZeros32) {
+  EXPECT_EQ(32, WebRtcSpl_CountLeadingZeros32(0));
+  EXPECT_EQ(32, WebRtcSpl_CountLeadingZeros32_NotBuiltin(0));
+  for (int i = 0; i < 32; ++i) {
+    const uint32_t single_one = uint32_t{1} << i;
+    const uint32_t all_ones = 2 * single_one - 1;
+    EXPECT_EQ(31 - i, WebRtcSpl_CountLeadingZeros32(single_one));
+    EXPECT_EQ(31 - i, WebRtcSpl_CountLeadingZeros32_NotBuiltin(single_one));
+    EXPECT_EQ(31 - i, WebRtcSpl_CountLeadingZeros32(all_ones));
+    EXPECT_EQ(31 - i, WebRtcSpl_CountLeadingZeros32_NotBuiltin(all_ones));
+  }
+}
+
+TEST(SplTest, CountLeadingZeros64) {
+  EXPECT_EQ(64, WebRtcSpl_CountLeadingZeros64(0));
+  EXPECT_EQ(64, WebRtcSpl_CountLeadingZeros64_NotBuiltin(0));
+  for (int i = 0; i < 64; ++i) {
+    const uint64_t single_one = uint64_t{1} << i;
+    const uint64_t all_ones = 2 * single_one - 1;
+    EXPECT_EQ(63 - i, WebRtcSpl_CountLeadingZeros64(single_one));
+    EXPECT_EQ(63 - i, WebRtcSpl_CountLeadingZeros64_NotBuiltin(single_one));
+    EXPECT_EQ(63 - i, WebRtcSpl_CountLeadingZeros64(all_ones));
+    EXPECT_EQ(63 - i, WebRtcSpl_CountLeadingZeros64_NotBuiltin(all_ones));
+  }
+}
+
+TEST(SplTest, MathOperationsTest) {
+  int A = 1134567892;
+  int32_t num = 117;
+  int32_t den = -5;
+  uint16_t denU = 5;
+  EXPECT_EQ(33700, WebRtcSpl_Sqrt(A));
+  EXPECT_EQ(33683, WebRtcSpl_SqrtFloor(A));
+
+  EXPECT_EQ(-91772805, WebRtcSpl_DivResultInQ31(den, num));
+  EXPECT_EQ(-23, WebRtcSpl_DivW32W16ResW16(num, (int16_t)den));
+  EXPECT_EQ(-23, WebRtcSpl_DivW32W16(num, (int16_t)den));
+  EXPECT_EQ(23u, WebRtcSpl_DivU32U16(num, denU));
+  EXPECT_EQ(0, WebRtcSpl_DivW32HiLow(128, 0, 256));
+}
+
+TEST(SplTest, BasicArrayOperationsTest) {
+  const size_t kVectorSize = 4;
+  int B[] = {4, 12, 133, 1100};
+  int16_t b16[kVectorSize];
+  int32_t b32[kVectorSize];
+
+  int16_t bTmp16[kVectorSize];
+  int32_t bTmp32[kVectorSize];
+
+  WebRtcSpl_MemSetW16(b16, 3, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(3, b16[kk]);
+  }
+  WebRtcSpl_ZerosArrayW16(b16, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(0, b16[kk]);
+  }
+  WebRtcSpl_MemSetW32(b32, 3, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(3, b32[kk]);
+  }
+  WebRtcSpl_ZerosArrayW32(b32, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(0, b32[kk]);
+  }
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    bTmp16[kk] = (int16_t)kk;
+    bTmp32[kk] = (int32_t)kk;
+  }
+  WEBRTC_SPL_MEMCPY_W16(b16, bTmp16, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(b16[kk], bTmp16[kk]);
+  }
+  //    WEBRTC_SPL_MEMCPY_W32(b32, bTmp32, kVectorSize);
+  //    for (int kk = 0; kk < kVectorSize; ++kk) {
+  //        EXPECT_EQ(b32[kk], bTmp32[kk]);
+  //    }
+  WebRtcSpl_CopyFromEndW16(b16, kVectorSize, 2, bTmp16);
+  for (size_t kk = 0; kk < 2; ++kk) {
+    EXPECT_EQ(static_cast<int16_t>(kk + 2), bTmp16[kk]);
+  }
+
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    b32[kk] = B[kk];
+    b16[kk] = (int16_t)B[kk];
+  }
+  WebRtcSpl_VectorBitShiftW32ToW16(bTmp16, kVectorSize, b32, 1);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((B[kk] >> 1), bTmp16[kk]);
+  }
+  WebRtcSpl_VectorBitShiftW16(bTmp16, kVectorSize, b16, 1);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((B[kk] >> 1), bTmp16[kk]);
+  }
+  WebRtcSpl_VectorBitShiftW32(bTmp32, kVectorSize, b32, 1);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((B[kk] >> 1), bTmp32[kk]);
+  }
+
+  WebRtcSpl_MemCpyReversedOrder(&bTmp16[3], b16, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(b16[3 - kk], bTmp16[kk]);
+  }
+}
+
+TEST(SplTest, MinMaxOperationsTest) {
+  const size_t kVectorSize = 17;
+
+  // Vectors to test the cases where minimum values have to be caught
+  // outside of the unrolled loops in ARM-Neon.
+  int16_t vector16[kVectorSize] = {-1,
+                                   7485,
+                                   0,
+                                   3333,
+                                   -18283,
+                                   0,
+                                   12334,
+                                   -29871,
+                                   988,
+                                   -3333,
+                                   345,
+                                   -456,
+                                   222,
+                                   999,
+                                   888,
+                                   8774,
+                                   WEBRTC_SPL_WORD16_MIN};
+  int32_t vector32[kVectorSize] = {-1,
+                                   0,
+                                   283211,
+                                   3333,
+                                   8712345,
+                                   0,
+                                   -3333,
+                                   89345,
+                                   -374585456,
+                                   222,
+                                   999,
+                                   122345334,
+                                   -12389756,
+                                   -987329871,
+                                   888,
+                                   -2,
+                                   WEBRTC_SPL_WORD32_MIN};
+
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN,
+            WebRtcSpl_MinValueW16(vector16, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD32_MIN,
+            WebRtcSpl_MinValueW32(vector32, kVectorSize));
+  EXPECT_EQ(kVectorSize - 1, WebRtcSpl_MinIndexW16(vector16, kVectorSize));
+  EXPECT_EQ(kVectorSize - 1, WebRtcSpl_MinIndexW32(vector32, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN,
+            WebRtcSpl_MaxAbsElementW16(vector16, kVectorSize));
+  int16_t min_value, max_value;
+  WebRtcSpl_MinMaxW16(vector16, kVectorSize, &min_value, &max_value);
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN, min_value);
+  EXPECT_EQ(12334, max_value);
+
+  // Test the cases where maximum values have to be caught
+  // outside of the unrolled loops in ARM-Neon.
+  vector16[kVectorSize - 1] = WEBRTC_SPL_WORD16_MAX;
+  vector32[kVectorSize - 1] = WEBRTC_SPL_WORD32_MAX;
+
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX,
+            WebRtcSpl_MaxAbsValueW16(vector16, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX,
+            WebRtcSpl_MaxValueW16(vector16, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD32_MAX,
+            WebRtcSpl_MaxAbsValueW32(vector32, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD32_MAX,
+            WebRtcSpl_MaxValueW32(vector32, kVectorSize));
+  EXPECT_EQ(kVectorSize - 1, WebRtcSpl_MaxAbsIndexW16(vector16, kVectorSize));
+  EXPECT_EQ(kVectorSize - 1, WebRtcSpl_MaxIndexW16(vector16, kVectorSize));
+  EXPECT_EQ(kVectorSize - 1, WebRtcSpl_MaxIndexW32(vector32, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX,
+            WebRtcSpl_MaxAbsElementW16(vector16, kVectorSize));
+  WebRtcSpl_MinMaxW16(vector16, kVectorSize, &min_value, &max_value);
+  EXPECT_EQ(-29871, min_value);
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX, max_value);
+
+  // Test the cases where multiple maximum and minimum values are present.
+  vector16[1] = WEBRTC_SPL_WORD16_MAX;
+  vector16[6] = WEBRTC_SPL_WORD16_MIN;
+  vector16[11] = WEBRTC_SPL_WORD16_MIN;
+  vector32[1] = WEBRTC_SPL_WORD32_MAX;
+  vector32[6] = WEBRTC_SPL_WORD32_MIN;
+  vector32[11] = WEBRTC_SPL_WORD32_MIN;
+
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX,
+            WebRtcSpl_MaxAbsValueW16(vector16, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX,
+            WebRtcSpl_MaxValueW16(vector16, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN,
+            WebRtcSpl_MinValueW16(vector16, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD32_MAX,
+            WebRtcSpl_MaxAbsValueW32(vector32, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD32_MAX,
+            WebRtcSpl_MaxValueW32(vector32, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD32_MIN,
+            WebRtcSpl_MinValueW32(vector32, kVectorSize));
+  EXPECT_EQ(6u, WebRtcSpl_MaxAbsIndexW16(vector16, kVectorSize));
+  EXPECT_EQ(1u, WebRtcSpl_MaxIndexW16(vector16, kVectorSize));
+  EXPECT_EQ(1u, WebRtcSpl_MaxIndexW32(vector32, kVectorSize));
+  EXPECT_EQ(6u, WebRtcSpl_MinIndexW16(vector16, kVectorSize));
+  EXPECT_EQ(6u, WebRtcSpl_MinIndexW32(vector32, kVectorSize));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN,
+            WebRtcSpl_MaxAbsElementW16(vector16, kVectorSize));
+  WebRtcSpl_MinMaxW16(vector16, kVectorSize, &min_value, &max_value);
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN, min_value);
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX, max_value);
+
+  // Test a one-element vector.
+  int16_t single_element_vector = 0;
+  EXPECT_EQ(0, WebRtcSpl_MaxAbsValueW16(&single_element_vector, 1));
+  EXPECT_EQ(0, WebRtcSpl_MaxValueW16(&single_element_vector, 1));
+  EXPECT_EQ(0, WebRtcSpl_MinValueW16(&single_element_vector, 1));
+  EXPECT_EQ(0u, WebRtcSpl_MaxAbsIndexW16(&single_element_vector, 1));
+  EXPECT_EQ(0u, WebRtcSpl_MaxIndexW16(&single_element_vector, 1));
+  EXPECT_EQ(0u, WebRtcSpl_MinIndexW16(&single_element_vector, 1));
+  EXPECT_EQ(0, WebRtcSpl_MaxAbsElementW16(&single_element_vector, 1));
+  WebRtcSpl_MinMaxW16(&single_element_vector, 1, &min_value, &max_value);
+  EXPECT_EQ(0, min_value);
+  EXPECT_EQ(0, max_value);
+
+  // Test a two-element vector with the values WEBRTC_SPL_WORD16_MIN and
+  // WEBRTC_SPL_WORD16_MAX.
+  int16_t two_element_vector[2] = {WEBRTC_SPL_WORD16_MIN,
+                                   WEBRTC_SPL_WORD16_MAX};
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX,
+            WebRtcSpl_MaxAbsValueW16(two_element_vector, 2));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX,
+            WebRtcSpl_MaxValueW16(two_element_vector, 2));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN,
+            WebRtcSpl_MinValueW16(two_element_vector, 2));
+  EXPECT_EQ(0u, WebRtcSpl_MaxAbsIndexW16(two_element_vector, 2));
+  EXPECT_EQ(1u, WebRtcSpl_MaxIndexW16(two_element_vector, 2));
+  EXPECT_EQ(0u, WebRtcSpl_MinIndexW16(two_element_vector, 2));
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN,
+            WebRtcSpl_MaxAbsElementW16(two_element_vector, 2));
+  WebRtcSpl_MinMaxW16(two_element_vector, 2, &min_value, &max_value);
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MIN, min_value);
+  EXPECT_EQ(WEBRTC_SPL_WORD16_MAX, max_value);
+}
+
+TEST(SplTest, VectorOperationsTest) {
+  const size_t kVectorSize = 4;
+  int B[] = {4, 12, 133, 1100};
+  int16_t a16[kVectorSize];
+  int16_t b16[kVectorSize];
+  int16_t bTmp16[kVectorSize];
+
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    a16[kk] = B[kk];
+    b16[kk] = B[kk];
+  }
+
+  WebRtcSpl_AffineTransformVector(bTmp16, b16, 3, 7, 2, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((B[kk] * 3 + 7) >> 2, bTmp16[kk]);
+  }
+  WebRtcSpl_ScaleAndAddVectorsWithRound(b16, 3, b16, 2, 2, bTmp16, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((B[kk] * 3 + B[kk] * 2 + 2) >> 2, bTmp16[kk]);
+  }
+
+  WebRtcSpl_AddAffineVectorToVector(bTmp16, b16, 3, 7, 2, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(((B[kk] * 3 + B[kk] * 2 + 2) >> 2) + ((b16[kk] * 3 + 7) >> 2),
+              bTmp16[kk]);
+  }
+
+  WebRtcSpl_ScaleVector(b16, bTmp16, 13, kVectorSize, 2);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((b16[kk] * 13) >> 2, bTmp16[kk]);
+  }
+  WebRtcSpl_ScaleVectorWithSat(b16, bTmp16, 13, kVectorSize, 2);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((b16[kk] * 13) >> 2, bTmp16[kk]);
+  }
+  WebRtcSpl_ScaleAndAddVectors(a16, 13, 2, b16, 7, 2, bTmp16, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(((a16[kk] * 13) >> 2) + ((b16[kk] * 7) >> 2), bTmp16[kk]);
+  }
+
+  WebRtcSpl_AddVectorsAndShift(bTmp16, a16, b16, kVectorSize, 2);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(B[kk] >> 1, bTmp16[kk]);
+  }
+  WebRtcSpl_ReverseOrderMultArrayElements(bTmp16, a16, &b16[3], kVectorSize, 2);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((a16[kk] * b16[3 - kk]) >> 2, bTmp16[kk]);
+  }
+  WebRtcSpl_ElementwiseVectorMult(bTmp16, a16, b16, kVectorSize, 6);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ((a16[kk] * b16[kk]) >> 6, bTmp16[kk]);
+  }
+
+  WebRtcSpl_SqrtOfOneMinusXSquared(b16, kVectorSize, bTmp16);
+  for (size_t kk = 0; kk < kVectorSize - 1; ++kk) {
+    EXPECT_EQ(32767, bTmp16[kk]);
+  }
+  EXPECT_EQ(32749, bTmp16[kVectorSize - 1]);
+
+  EXPECT_EQ(0, WebRtcSpl_GetScalingSquare(b16, kVectorSize, 1));
+}
+
+TEST(SplTest, EstimatorsTest) {
+  const size_t kOrder = 2;
+  const int32_t unstable_filter[] = {4, 12, 133, 1100};
+  const int32_t stable_filter[] = {1100, 133, 12, 4};
+  int16_t lpc[kOrder + 2] = {0};
+  int16_t refl[kOrder + 2] = {0};
+  int16_t lpc_result[] = {4096, -497, 15, 0};
+  int16_t refl_result[] = {-3962, 123, 0, 0};
+
+  EXPECT_EQ(0, WebRtcSpl_LevinsonDurbin(unstable_filter, lpc, refl, kOrder));
+  EXPECT_EQ(1, WebRtcSpl_LevinsonDurbin(stable_filter, lpc, refl, kOrder));
+  for (size_t i = 0; i < kOrder + 2; ++i) {
+    EXPECT_EQ(lpc_result[i], lpc[i]);
+    EXPECT_EQ(refl_result[i], refl[i]);
+  }
+}
+
+TEST(SplTest, FilterTest) {
+  const size_t kVectorSize = 4;
+  const size_t kFilterOrder = 3;
+  int16_t A[] = {1, 2, 33, 100};
+  int16_t A5[] = {1, 2, 33, 100, -5};
+  int16_t B[] = {4, 12, 133, 110};
+  int16_t data_in[kVectorSize];
+  int16_t data_out[kVectorSize];
+  int16_t bTmp16Low[kVectorSize];
+  int16_t bState[kVectorSize];
+  int16_t bStateLow[kVectorSize];
+
+  WebRtcSpl_ZerosArrayW16(bState, kVectorSize);
+  WebRtcSpl_ZerosArrayW16(bStateLow, kVectorSize);
+
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    data_in[kk] = A[kk];
+    data_out[kk] = 0;
+  }
+
+  // MA filters.
+  // Note that the input data has `kFilterOrder` states before the actual
+  // data (one sample).
+  WebRtcSpl_FilterMAFastQ12(&data_in[kFilterOrder], data_out, B,
+                            kFilterOrder + 1, 1);
+  EXPECT_EQ(0, data_out[0]);
+  // AR filters.
+  // Note that the output data has `kFilterOrder` states before the actual
+  // data (one sample).
+  WebRtcSpl_FilterARFastQ12(data_in, &data_out[kFilterOrder], A,
+                            kFilterOrder + 1, 1);
+  EXPECT_EQ(0, data_out[kFilterOrder]);
+
+  EXPECT_EQ(kVectorSize, WebRtcSpl_FilterAR(A5, 5, data_in, kVectorSize, bState,
+                                            kVectorSize, bStateLow, kVectorSize,
+                                            data_out, bTmp16Low, kVectorSize));
+}
+
+TEST(SplTest, RandTest) {
+  const int kVectorSize = 4;
+  int16_t BU[] = {3653, 12446, 8525, 30691};
+  int16_t b16[kVectorSize];
+  uint32_t bSeed = 100000;
+
+  EXPECT_EQ(7086, WebRtcSpl_RandU(&bSeed));
+  EXPECT_EQ(31565, WebRtcSpl_RandU(&bSeed));
+  EXPECT_EQ(-9786, WebRtcSpl_RandN(&bSeed));
+  EXPECT_EQ(kVectorSize, WebRtcSpl_RandUArray(b16, kVectorSize, &bSeed));
+  for (int kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(BU[kk], b16[kk]);
+  }
+}
+
+TEST(SplTest, DotProductWithScaleTest) {
+  EXPECT_EQ(605362796, WebRtcSpl_DotProductWithScale(vector16, vector16,
+                                                     kVector16Size, 2));
+}
+
+TEST(SplTest, CrossCorrelationTest) {
+  // Note the function arguments relation specificed by API.
+  const size_t kCrossCorrelationDimension = 3;
+  const int kShift = 2;
+  const int kStep = 1;
+  const size_t kSeqDimension = 6;
+
+  const int16_t kVector16[kVector16Size] = {
+      1,    4323, 1963, WEBRTC_SPL_WORD16_MAX, WEBRTC_SPL_WORD16_MIN + 5, -3333,
+      -876, 8483, 142};
+  int32_t vector32[kCrossCorrelationDimension] = {0};
+
+  WebRtcSpl_CrossCorrelation(vector32, vector16, kVector16, kSeqDimension,
+                             kCrossCorrelationDimension, kShift, kStep);
+
+  // WebRtcSpl_CrossCorrelationC() and WebRtcSpl_CrossCorrelationNeon()
+  // are not bit-exact.
+  const int32_t kExpected[kCrossCorrelationDimension] = {-266947903, -15579555,
+                                                         -171282001};
+  const int32_t* expected = kExpected;
+#if !defined(MIPS32_LE)
+  const int32_t kExpectedNeon[kCrossCorrelationDimension] = {
+      -266947901, -15579553, -171281999};
+  if (WebRtcSpl_CrossCorrelation != WebRtcSpl_CrossCorrelationC) {
+    expected = kExpectedNeon;
+  }
+#endif
+  for (size_t i = 0; i < kCrossCorrelationDimension; ++i) {
+    EXPECT_EQ(expected[i], vector32[i]);
+  }
+}
+
+TEST(SplTest, AutoCorrelationTest) {
+  int scale = 0;
+  int32_t vector32[kVector16Size];
+  const int32_t expected[kVector16Size] = {302681398, 14223410,  -121705063,
+                                           -85221647, -17104971, 61806945,
+                                           6644603,   -669329,   43};
+
+  EXPECT_EQ(kVector16Size,
+            WebRtcSpl_AutoCorrelation(vector16, kVector16Size,
+                                      kVector16Size - 1, vector32, &scale));
+  EXPECT_EQ(3, scale);
+  for (size_t i = 0; i < kVector16Size; ++i) {
+    EXPECT_EQ(expected[i], vector32[i]);
+  }
+}
+
+TEST(SplTest, SignalProcessingTest) {
+  const size_t kVectorSize = 4;
+  int A[] = {1, 2, 33, 100};
+  const int16_t kHanning[4] = {2399, 8192, 13985, 16384};
+  int16_t b16[kVectorSize];
+
+  int16_t bTmp16[kVectorSize];
+
+  int bScale = 0;
+
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    b16[kk] = A[kk];
+  }
+
+  // TODO(bjornv): Activate the Reflection Coefficient tests when refactoring.
+  //    WebRtcSpl_ReflCoefToLpc(b16, kVectorSize, bTmp16);
+  ////    for (int kk = 0; kk < kVectorSize; ++kk) {
+  ////        EXPECT_EQ(aTmp16[kk], bTmp16[kk]);
+  ////    }
+  //    WebRtcSpl_LpcToReflCoef(bTmp16, kVectorSize, b16);
+  ////    for (int kk = 0; kk < kVectorSize; ++kk) {
+  ////        EXPECT_EQ(a16[kk], b16[kk]);
+  ////    }
+  //    WebRtcSpl_AutoCorrToReflCoef(b32, kVectorSize, bTmp16);
+  ////    for (int kk = 0; kk < kVectorSize; ++kk) {
+  ////        EXPECT_EQ(aTmp16[kk], bTmp16[kk]);
+  ////    }
+
+  WebRtcSpl_GetHanningWindow(bTmp16, kVectorSize);
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    EXPECT_EQ(kHanning[kk], bTmp16[kk]);
+  }
+
+  for (size_t kk = 0; kk < kVectorSize; ++kk) {
+    b16[kk] = A[kk];
+  }
+  EXPECT_EQ(11094, WebRtcSpl_Energy(b16, kVectorSize, &bScale));
+  EXPECT_EQ(0, bScale);
+}
+
+TEST(SplTest, FFTTest) {
+  int16_t B[] = {1, 2, 33, 100, 2, 3, 34, 101, 3, 4, 35, 102, 4, 5, 36, 103};
+
+  EXPECT_EQ(0, WebRtcSpl_ComplexFFT(B, 3, 1));
+  //    for (int kk = 0; kk < 16; ++kk) {
+  //        EXPECT_EQ(A[kk], B[kk]);
+  //    }
+  EXPECT_EQ(0, WebRtcSpl_ComplexIFFT(B, 3, 1));
+  //    for (int kk = 0; kk < 16; ++kk) {
+  //        EXPECT_EQ(A[kk], B[kk]);
+  //    }
+  WebRtcSpl_ComplexBitReverse(B, 3);
+  for (int kk = 0; kk < 16; ++kk) {
+    //      EXPECT_EQ(A[kk], B[kk]);
+  }
+}
+
+TEST(SplTest, Resample48WithSaturationTest) {
+  // The test resamples 3*kBlockSize number of samples to 2*kBlockSize number
+  // of samples.
+  const size_t kBlockSize = 16;
+
+  // Saturated input vector of 48 samples.
+  const int32_t kVectorSaturated[3 * kBlockSize + 7] = {
+      -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768,
+      -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768,
+      -32768, -32768, -32768, -32768, -32768, -32768, -32768, -32768,
+      32767,  32767,  32767,  32767,  32767,  32767,  32767,  32767,
+      32767,  32767,  32767,  32767,  32767,  32767,  32767,  32767,
+      32767,  32767,  32767,  32767,  32767,  32767,  32767,  32767,
+      32767,  32767,  32767,  32767,  32767,  32767,  32767};
+
+  // All values in `out_vector` should be `kRefValue32kHz`.
+  const int32_t kRefValue32kHz1 = -1077493760;
+  const int32_t kRefValue32kHz2 = 1077493645;
+
+  // After bit shift with saturation, `out_vector_w16` is saturated.
+
+  const int16_t kRefValue16kHz1 = -32768;
+  const int16_t kRefValue16kHz2 = 32767;
+  // Vector for storing output.
+  int32_t out_vector[2 * kBlockSize];
+  int16_t out_vector_w16[2 * kBlockSize];
+
+  WebRtcSpl_Resample48khzTo32khz(kVectorSaturated, out_vector, kBlockSize);
+  WebRtcSpl_VectorBitShiftW32ToW16(out_vector_w16, 2 * kBlockSize, out_vector,
+                                   15);
+
+  // Comparing output values against references. The values at position
+  // 12-15 are skipped to account for the filter lag.
+  for (size_t i = 0; i < 12; ++i) {
+    EXPECT_EQ(kRefValue32kHz1, out_vector[i]);
+    EXPECT_EQ(kRefValue16kHz1, out_vector_w16[i]);
+  }
+  for (size_t i = 16; i < 2 * kBlockSize; ++i) {
+    EXPECT_EQ(kRefValue32kHz2, out_vector[i]);
+    EXPECT_EQ(kRefValue16kHz2, out_vector_w16[i]);
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/spl_init.c b/third_party/libwebrtc/common_audio/signal_processing/spl_init.c
new file mode 100644
index 0000000000..cf37d47bec
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/spl_init.c
@@ -0,0 +1,69 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Some code came from common/rtcd.c in the WebM project.
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// TODO(bugs.webrtc.org/9553): These function pointers are useless. Refactor
+// things so that we simply have a bunch of regular functions with different
+// implementations for different platforms.
+
+#if defined(WEBRTC_HAS_NEON)
+
+const MaxAbsValueW16 WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16Neon;
+const MaxAbsValueW32 WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32Neon;
+const MaxValueW16 WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16Neon;
+const MaxValueW32 WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32Neon;
+const MinValueW16 WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16Neon;
+const MinValueW32 WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32Neon;
+const CrossCorrelation WebRtcSpl_CrossCorrelation =
+    WebRtcSpl_CrossCorrelationNeon;
+const DownsampleFast WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastNeon;
+const ScaleAndAddVectorsWithRound WebRtcSpl_ScaleAndAddVectorsWithRound =
+    WebRtcSpl_ScaleAndAddVectorsWithRoundC;
+
+#elif defined(MIPS32_LE)
+
+const MaxAbsValueW16 WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16_mips;
+const MaxAbsValueW32 WebRtcSpl_MaxAbsValueW32 =
+#ifdef MIPS_DSP_R1_LE
+    WebRtcSpl_MaxAbsValueW32_mips;
+#else
+    WebRtcSpl_MaxAbsValueW32C;
+#endif
+const MaxValueW16 WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16_mips;
+const MaxValueW32 WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32_mips;
+const MinValueW16 WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16_mips;
+const MinValueW32 WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32_mips;
+const CrossCorrelation WebRtcSpl_CrossCorrelation =
+    WebRtcSpl_CrossCorrelation_mips;
+const DownsampleFast WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFast_mips;
+const ScaleAndAddVectorsWithRound WebRtcSpl_ScaleAndAddVectorsWithRound =
+#ifdef MIPS_DSP_R1_LE
+    WebRtcSpl_ScaleAndAddVectorsWithRound_mips;
+#else
+    WebRtcSpl_ScaleAndAddVectorsWithRoundC;
+#endif
+
+#else
+
+const MaxAbsValueW16 WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16C;
+const MaxAbsValueW32 WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32C;
+const MaxValueW16 WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16C;
+const MaxValueW32 WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32C;
+const MinValueW16 WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16C;
+const MinValueW32 WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32C;
+const CrossCorrelation WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelationC;
+const DownsampleFast WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastC;
+const ScaleAndAddVectorsWithRound WebRtcSpl_ScaleAndAddVectorsWithRound =
+    WebRtcSpl_ScaleAndAddVectorsWithRoundC;
+
+#endif
diff --git a/third_party/libwebrtc/common_audio/signal_processing/spl_inl.c b/third_party/libwebrtc/common_audio/signal_processing/spl_inl.c
new file mode 100644
index 0000000000..d09e308ed3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/spl_inl.c
@@ -0,0 +1,24 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdint.h>
+
+#include "common_audio/signal_processing/include/spl_inl.h"
+
+// Table used by WebRtcSpl_CountLeadingZeros32_NotBuiltin. For each uint32_t n
+// that's a sequence of 0 bits followed by a sequence of 1 bits, the entry at
+// index (n * 0x8c0b2891) >> 26 in this table gives the number of zero bits in
+// n.
+const int8_t kWebRtcSpl_CountLeadingZeros32_Table[64] = {
+    32, 8,  17, -1, -1, 14, -1, -1, -1, 20, -1, -1, -1, 28, -1, 18,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0,  26, 25, 24,
+    4,  11, 23, 31, 3,  7,  10, 16, 22, 30, -1, -1, 2,  6,  13, 9,
+    -1, 15, -1, 21, -1, 29, 19, -1, -1, -1, -1, -1, 1,  27, 5,  12,
+};
diff --git a/third_party/libwebrtc/common_audio/signal_processing/spl_sqrt.c b/third_party/libwebrtc/common_audio/signal_processing/spl_sqrt.c
new file mode 100644
index 0000000000..cf9448ac97
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/spl_sqrt.c
@@ -0,0 +1,194 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_Sqrt().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+int32_t WebRtcSpl_SqrtLocal(int32_t in);
+
+int32_t WebRtcSpl_SqrtLocal(int32_t in)
+{
+
+    int16_t x_half, t16;
+    int32_t A, B, x2;
+
+    /* The following block performs:
+     y=in/2
+     x=y-2^30
+     x_half=x/2^31
+     t = 1 + (x_half) - 0.5*((x_half)^2) + 0.5*((x_half)^3) - 0.625*((x_half)^4)
+         + 0.875*((x_half)^5)
+     */
+
+    B = in / 2;
+
+    B = B - ((int32_t)0x40000000); // B = in/2 - 1/2
+    x_half = (int16_t)(B >> 16);  // x_half = x/2 = (in-1)/2
+    B = B + ((int32_t)0x40000000); // B = 1 + x/2
+    B = B + ((int32_t)0x40000000); // Add 0.5 twice (since 1.0 does not exist in Q31)
+
+    x2 = ((int32_t)x_half) * ((int32_t)x_half) * 2; // A = (x/2)^2
+    A = -x2; // A = -(x/2)^2
+    B = B + (A >> 1); // B = 1 + x/2 - 0.5*(x/2)^2
+
+    A >>= 16;
+    A = A * A * 2; // A = (x/2)^4
+    t16 = (int16_t)(A >> 16);
+    B += -20480 * t16 * 2;  // B = B - 0.625*A
+    // After this, B = 1 + x/2 - 0.5*(x/2)^2 - 0.625*(x/2)^4
+
+    A = x_half * t16 * 2;  // A = (x/2)^5
+    t16 = (int16_t)(A >> 16);
+    B += 28672 * t16 * 2;  // B = B + 0.875*A
+    // After this, B = 1 + x/2 - 0.5*(x/2)^2 - 0.625*(x/2)^4 + 0.875*(x/2)^5
+
+    t16 = (int16_t)(x2 >> 16);
+    A = x_half * t16 * 2;  // A = x/2^3
+
+    B = B + (A >> 1); // B = B + 0.5*A
+    // After this, B = 1 + x/2 - 0.5*(x/2)^2 + 0.5*(x/2)^3 - 0.625*(x/2)^4 + 0.875*(x/2)^5
+
+    B = B + ((int32_t)32768); // Round off bit
+
+    return B;
+}
+
+int32_t WebRtcSpl_Sqrt(int32_t value)
+{
+    /*
+     Algorithm:
+
+     Six term Taylor Series is used here to compute the square root of a number
+     y^0.5 = (1+x)^0.5 where x = y-1
+     = 1+(x/2)-0.5*((x/2)^2+0.5*((x/2)^3-0.625*((x/2)^4+0.875*((x/2)^5)
+     0.5 <= x < 1
+
+     Example of how the algorithm works, with ut=sqrt(in), and
+     with in=73632 and ut=271 (even shift value case):
+
+     in=73632
+     y= in/131072
+     x=y-1
+     t = 1 + (x/2) - 0.5*((x/2)^2) + 0.5*((x/2)^3) - 0.625*((x/2)^4) + 0.875*((x/2)^5)
+     ut=t*(1/sqrt(2))*512
+
+     or:
+
+     in=73632
+     in2=73632*2^14
+     y= in2/2^31
+     x=y-1
+     t = 1 + (x/2) - 0.5*((x/2)^2) + 0.5*((x/2)^3) - 0.625*((x/2)^4) + 0.875*((x/2)^5)
+     ut=t*(1/sqrt(2))
+     ut2=ut*2^9
+
+     which gives:
+
+     in  = 73632
+     in2 = 1206386688
+     y   = 0.56176757812500
+     x   = -0.43823242187500
+     t   = 0.74973506527313
+     ut  = 0.53014274874797
+     ut2 = 2.714330873589594e+002
+
+     or:
+
+     in=73632
+     in2=73632*2^14
+     y=in2/2
+     x=y-2^30
+     x_half=x/2^31
+     t = 1 + (x_half) - 0.5*((x_half)^2) + 0.5*((x_half)^3) - 0.625*((x_half)^4)
+         + 0.875*((x_half)^5)
+     ut=t*(1/sqrt(2))
+     ut2=ut*2^9
+
+     which gives:
+
+     in  = 73632
+     in2 = 1206386688
+     y   = 603193344
+     x   = -470548480
+     x_half =  -0.21911621093750
+     t   = 0.74973506527313
+     ut  = 0.53014274874797
+     ut2 = 2.714330873589594e+002
+
+     */
+
+    int16_t x_norm, nshift, t16, sh;
+    int32_t A;
+
+    int16_t k_sqrt_2 = 23170; // 1/sqrt2 (==5a82)
+
+    A = value;
+
+    // The convention in this function is to calculate sqrt(abs(A)). Negate the
+    // input if it is negative.
+    if (A < 0) {
+        if (A == WEBRTC_SPL_WORD32_MIN) {
+            // This number cannot be held in an int32_t after negating.
+            // Map it to the maximum positive value.
+            A = WEBRTC_SPL_WORD32_MAX;
+        } else {
+            A = -A;
+        }
+    } else if (A == 0) {
+        return 0;  // sqrt(0) = 0
+    }
+
+    sh = WebRtcSpl_NormW32(A); // # shifts to normalize A
+    A = WEBRTC_SPL_LSHIFT_W32(A, sh); // Normalize A
+    if (A < (WEBRTC_SPL_WORD32_MAX - 32767))
+    {
+        A = A + ((int32_t)32768); // Round off bit
+    } else
+    {
+        A = WEBRTC_SPL_WORD32_MAX;
+    }
+
+    x_norm = (int16_t)(A >> 16);  // x_norm = AH
+
+    nshift = (sh / 2);
+    RTC_DCHECK_GE(nshift, 0);
+
+    A = (int32_t)WEBRTC_SPL_LSHIFT_W32((int32_t)x_norm, 16);
+    A = WEBRTC_SPL_ABS_W32(A); // A = abs(x_norm<<16)
+    A = WebRtcSpl_SqrtLocal(A); // A = sqrt(A)
+
+    if (2 * nshift == sh) {
+        // Even shift value case
+
+        t16 = (int16_t)(A >> 16);  // t16 = AH
+
+        A = k_sqrt_2 * t16 * 2;  // A = 1/sqrt(2)*t16
+        A = A + ((int32_t)32768); // Round off
+        A = A & ((int32_t)0x7fff0000); // Round off
+
+        A >>= 15;  // A = A>>16
+
+    } else
+    {
+        A >>= 16;  // A = A>>16
+    }
+
+    A = A & ((int32_t)0x0000ffff);
+    A >>= nshift;  // De-normalize the result.
+
+    return A;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/splitting_filter.c b/third_party/libwebrtc/common_audio/signal_processing/splitting_filter.c
new file mode 100644
index 0000000000..27a0a2a8c9
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/splitting_filter.c
@@ -0,0 +1,211 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This file contains the splitting filter functions.
+ *
+ */
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// Maximum number of samples in a low/high-band frame.
+enum
+{
+    kMaxBandFrameLength = 320  // 10 ms at 64 kHz.
+};
+
+// QMF filter coefficients in Q16.
+static const uint16_t WebRtcSpl_kAllPassFilter1[3] = {6418, 36982, 57261};
+static const uint16_t WebRtcSpl_kAllPassFilter2[3] = {21333, 49062, 63010};
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// WebRtcSpl_AllPassQMF(...)
+//
+// Allpass filter used by the analysis and synthesis parts of the QMF filter.
+//
+// Input:
+//    - in_data             : Input data sequence (Q10)
+//    - data_length         : Length of data sequence (>2)
+//    - filter_coefficients : Filter coefficients (length 3, Q16)
+//
+// Input & Output:
+//    - filter_state        : Filter state (length 6, Q10).
+//
+// Output:
+//    - out_data            : Output data sequence (Q10), length equal to
+//                            `data_length`
+//
+
+static void WebRtcSpl_AllPassQMF(int32_t* in_data,
+                                 size_t data_length,
+                                 int32_t* out_data,
+                                 const uint16_t* filter_coefficients,
+                                 int32_t* filter_state)
+{
+    // The procedure is to filter the input with three first order all pass
+    // filters (cascade operations).
+    //
+    //         a_3 + q^-1    a_2 + q^-1    a_1 + q^-1
+    // y[n] =  -----------   -----------   -----------   x[n]
+    //         1 + a_3q^-1   1 + a_2q^-1   1 + a_1q^-1
+    //
+    // The input vector `filter_coefficients` includes these three filter
+    // coefficients. The filter state contains the in_data state, in_data[-1],
+    // followed by the out_data state, out_data[-1]. This is repeated for each
+    // cascade. The first cascade filter will filter the `in_data` and store
+    // the output in `out_data`. The second will the take the `out_data` as
+    // input and make an intermediate storage in `in_data`, to save memory. The
+    // third, and final, cascade filter operation takes the `in_data` (which is
+    // the output from the previous cascade filter) and store the output in
+    // `out_data`. Note that the input vector values are changed during the
+    // process.
+    size_t k;
+    int32_t diff;
+    // First all-pass cascade; filter from in_data to out_data.
+
+    // Let y_i[n] indicate the output of cascade filter i (with filter
+    // coefficient a_i) at vector position n. Then the final output will be
+    // y[n] = y_3[n]
+
+    // First loop, use the states stored in memory.
+    // "diff" should be safe from wrap around since max values are 2^25
+    // diff = (x[0] - y_1[-1])
+    diff = WebRtcSpl_SubSatW32(in_data[0], filter_state[1]);
+    // y_1[0] =  x[-1] + a_1 * (x[0] - y_1[-1])
+    out_data[0] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[0], diff, filter_state[0]);
+
+    // For the remaining loops, use previous values.
+    for (k = 1; k < data_length; k++)
+    {
+        // diff = (x[n] - y_1[n-1])
+        diff = WebRtcSpl_SubSatW32(in_data[k], out_data[k - 1]);
+        // y_1[n] =  x[n-1] + a_1 * (x[n] - y_1[n-1])
+        out_data[k] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[0], diff, in_data[k - 1]);
+    }
+
+    // Update states.
+    filter_state[0] = in_data[data_length - 1]; // x[N-1], becomes x[-1] next time
+    filter_state[1] = out_data[data_length - 1]; // y_1[N-1], becomes y_1[-1] next time
+
+    // Second all-pass cascade; filter from out_data to in_data.
+    // diff = (y_1[0] - y_2[-1])
+    diff = WebRtcSpl_SubSatW32(out_data[0], filter_state[3]);
+    // y_2[0] =  y_1[-1] + a_2 * (y_1[0] - y_2[-1])
+    in_data[0] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[1], diff, filter_state[2]);
+    for (k = 1; k < data_length; k++)
+    {
+        // diff = (y_1[n] - y_2[n-1])
+        diff = WebRtcSpl_SubSatW32(out_data[k], in_data[k - 1]);
+        // y_2[0] =  y_1[-1] + a_2 * (y_1[0] - y_2[-1])
+        in_data[k] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[1], diff, out_data[k-1]);
+    }
+
+    filter_state[2] = out_data[data_length - 1]; // y_1[N-1], becomes y_1[-1] next time
+    filter_state[3] = in_data[data_length - 1]; // y_2[N-1], becomes y_2[-1] next time
+
+    // Third all-pass cascade; filter from in_data to out_data.
+    // diff = (y_2[0] - y[-1])
+    diff = WebRtcSpl_SubSatW32(in_data[0], filter_state[5]);
+    // y[0] =  y_2[-1] + a_3 * (y_2[0] - y[-1])
+    out_data[0] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[2], diff, filter_state[4]);
+    for (k = 1; k < data_length; k++)
+    {
+        // diff = (y_2[n] - y[n-1])
+        diff = WebRtcSpl_SubSatW32(in_data[k], out_data[k - 1]);
+        // y[n] =  y_2[n-1] + a_3 * (y_2[n] - y[n-1])
+        out_data[k] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[2], diff, in_data[k-1]);
+    }
+    filter_state[4] = in_data[data_length - 1]; // y_2[N-1], becomes y_2[-1] next time
+    filter_state[5] = out_data[data_length - 1]; // y[N-1], becomes y[-1] next time
+}
+
+void WebRtcSpl_AnalysisQMF(const int16_t* in_data, size_t in_data_length,
+                           int16_t* low_band, int16_t* high_band,
+                           int32_t* filter_state1, int32_t* filter_state2)
+{
+    size_t i;
+    int16_t k;
+    int32_t tmp;
+    int32_t half_in1[kMaxBandFrameLength];
+    int32_t half_in2[kMaxBandFrameLength];
+    int32_t filter1[kMaxBandFrameLength];
+    int32_t filter2[kMaxBandFrameLength];
+    const size_t band_length = in_data_length / 2;
+    RTC_DCHECK_EQ(0, in_data_length % 2);
+    RTC_DCHECK_LE(band_length, kMaxBandFrameLength);
+
+    // Split even and odd samples. Also shift them to Q10.
+    for (i = 0, k = 0; i < band_length; i++, k += 2)
+    {
+        half_in2[i] = ((int32_t)in_data[k]) * (1 << 10);
+        half_in1[i] = ((int32_t)in_data[k + 1]) * (1 << 10);
+    }
+
+    // All pass filter even and odd samples, independently.
+    WebRtcSpl_AllPassQMF(half_in1, band_length, filter1,
+                         WebRtcSpl_kAllPassFilter1, filter_state1);
+    WebRtcSpl_AllPassQMF(half_in2, band_length, filter2,
+                         WebRtcSpl_kAllPassFilter2, filter_state2);
+
+    // Take the sum and difference of filtered version of odd and even
+    // branches to get upper & lower band.
+    for (i = 0; i < band_length; i++)
+    {
+        tmp = (filter1[i] + filter2[i] + 1024) >> 11;
+        low_band[i] = WebRtcSpl_SatW32ToW16(tmp);
+
+        tmp = (filter1[i] - filter2[i] + 1024) >> 11;
+        high_band[i] = WebRtcSpl_SatW32ToW16(tmp);
+    }
+}
+
+void WebRtcSpl_SynthesisQMF(const int16_t* low_band, const int16_t* high_band,
+                            size_t band_length, int16_t* out_data,
+                            int32_t* filter_state1, int32_t* filter_state2)
+{
+    int32_t tmp;
+    int32_t half_in1[kMaxBandFrameLength];
+    int32_t half_in2[kMaxBandFrameLength];
+    int32_t filter1[kMaxBandFrameLength];
+    int32_t filter2[kMaxBandFrameLength];
+    size_t i;
+    int16_t k;
+    RTC_DCHECK_LE(band_length, kMaxBandFrameLength);
+
+    // Obtain the sum and difference channels out of upper and lower-band channels.
+    // Also shift to Q10 domain.
+    for (i = 0; i < band_length; i++)
+    {
+        tmp = (int32_t)low_band[i] + (int32_t)high_band[i];
+        half_in1[i] = tmp * (1 << 10);
+        tmp = (int32_t)low_band[i] - (int32_t)high_band[i];
+        half_in2[i] = tmp * (1 << 10);
+    }
+
+    // all-pass filter the sum and difference channels
+    WebRtcSpl_AllPassQMF(half_in1, band_length, filter1,
+                         WebRtcSpl_kAllPassFilter2, filter_state1);
+    WebRtcSpl_AllPassQMF(half_in2, band_length, filter2,
+                         WebRtcSpl_kAllPassFilter1, filter_state2);
+
+    // The filtered signals are even and odd samples of the output. Combine
+    // them. The signals are Q10 should shift them back to Q0 and take care of
+    // saturation.
+    for (i = 0, k = 0; i < band_length; i++)
+    {
+        tmp = (filter2[i] + 512) >> 10;
+        out_data[k++] = WebRtcSpl_SatW32ToW16(tmp);
+
+        tmp = (filter1[i] + 512) >> 10;
+        out_data[k++] = WebRtcSpl_SatW32ToW16(tmp);
+    }
+
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/sqrt_of_one_minus_x_squared.c b/third_party/libwebrtc/common_audio/signal_processing/sqrt_of_one_minus_x_squared.c
new file mode 100644
index 0000000000..a77fd4063f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/sqrt_of_one_minus_x_squared.c
@@ -0,0 +1,35 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_SqrtOfOneMinusXSquared().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_SqrtOfOneMinusXSquared(int16_t *xQ15, size_t vector_length,
+                                      int16_t *yQ15)
+{
+    int32_t sq;
+    size_t m;
+    int16_t tmp;
+
+    for (m = 0; m < vector_length; m++)
+    {
+        tmp = xQ15[m];
+        sq = tmp * tmp;  // x^2 in Q30
+        sq = 1073741823 - sq; // 1-x^2, where 1 ~= 0.99999999906 is 1073741823 in Q30
+        sq = WebRtcSpl_Sqrt(sq); // sqrt(1-x^2) in Q15
+        yQ15[m] = (int16_t)sq;
+    }
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/vector_scaling_operations.c b/third_party/libwebrtc/common_audio/signal_processing/vector_scaling_operations.c
new file mode 100644
index 0000000000..7307dc78ff
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/vector_scaling_operations.c
@@ -0,0 +1,165 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains implementations of the functions
+ * WebRtcSpl_VectorBitShiftW16()
+ * WebRtcSpl_VectorBitShiftW32()
+ * WebRtcSpl_VectorBitShiftW32ToW16()
+ * WebRtcSpl_ScaleVector()
+ * WebRtcSpl_ScaleVectorWithSat()
+ * WebRtcSpl_ScaleAndAddVectors()
+ * WebRtcSpl_ScaleAndAddVectorsWithRoundC()
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+void WebRtcSpl_VectorBitShiftW16(int16_t *res, size_t length,
+                                 const int16_t *in, int16_t right_shifts)
+{
+    size_t i;
+
+    if (right_shifts > 0)
+    {
+        for (i = length; i > 0; i--)
+        {
+            (*res++) = ((*in++) >> right_shifts);
+        }
+    } else
+    {
+        for (i = length; i > 0; i--)
+        {
+            (*res++) = ((*in++) * (1 << (-right_shifts)));
+        }
+    }
+}
+
+void WebRtcSpl_VectorBitShiftW32(int32_t *out_vector,
+                                 size_t vector_length,
+                                 const int32_t *in_vector,
+                                 int16_t right_shifts)
+{
+    size_t i;
+
+    if (right_shifts > 0)
+    {
+        for (i = vector_length; i > 0; i--)
+        {
+            (*out_vector++) = ((*in_vector++) >> right_shifts);
+        }
+    } else
+    {
+        for (i = vector_length; i > 0; i--)
+        {
+            (*out_vector++) = ((*in_vector++) << (-right_shifts));
+        }
+    }
+}
+
+void WebRtcSpl_VectorBitShiftW32ToW16(int16_t* out, size_t length,
+                                      const int32_t* in, int right_shifts) {
+  size_t i;
+  int32_t tmp_w32;
+
+  if (right_shifts >= 0) {
+    for (i = length; i > 0; i--) {
+      tmp_w32 = (*in++) >> right_shifts;
+      (*out++) = WebRtcSpl_SatW32ToW16(tmp_w32);
+    }
+  } else {
+    int left_shifts = -right_shifts;
+    for (i = length; i > 0; i--) {
+      tmp_w32 = (*in++) << left_shifts;
+      (*out++) = WebRtcSpl_SatW32ToW16(tmp_w32);
+    }
+  }
+}
+
+void WebRtcSpl_ScaleVector(const int16_t *in_vector, int16_t *out_vector,
+                           int16_t gain, size_t in_vector_length,
+                           int16_t right_shifts)
+{
+    // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts
+    size_t i;
+    const int16_t *inptr;
+    int16_t *outptr;
+
+    inptr = in_vector;
+    outptr = out_vector;
+
+    for (i = 0; i < in_vector_length; i++)
+    {
+      *outptr++ = (int16_t)((*inptr++ * gain) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_ScaleVectorWithSat(const int16_t *in_vector, int16_t *out_vector,
+                                 int16_t gain, size_t in_vector_length,
+                                 int16_t right_shifts)
+{
+    // Performs vector operation: out_vector = (gain*in_vector)>>right_shifts
+    size_t i;
+    const int16_t *inptr;
+    int16_t *outptr;
+
+    inptr = in_vector;
+    outptr = out_vector;
+
+    for (i = 0; i < in_vector_length; i++) {
+      *outptr++ = WebRtcSpl_SatW32ToW16((*inptr++ * gain) >> right_shifts);
+    }
+}
+
+void WebRtcSpl_ScaleAndAddVectors(const int16_t *in1, int16_t gain1, int shift1,
+                                  const int16_t *in2, int16_t gain2, int shift2,
+                                  int16_t *out, size_t vector_length)
+{
+    // Performs vector operation: out = (gain1*in1)>>shift1 + (gain2*in2)>>shift2
+    size_t i;
+    const int16_t *in1ptr;
+    const int16_t *in2ptr;
+    int16_t *outptr;
+
+    in1ptr = in1;
+    in2ptr = in2;
+    outptr = out;
+
+    for (i = 0; i < vector_length; i++)
+    {
+      *outptr++ = (int16_t)((gain1 * *in1ptr++) >> shift1) +
+          (int16_t)((gain2 * *in2ptr++) >> shift2);
+    }
+}
+
+// C version of WebRtcSpl_ScaleAndAddVectorsWithRound() for generic platforms.
+int WebRtcSpl_ScaleAndAddVectorsWithRoundC(const int16_t* in_vector1,
+                                           int16_t in_vector1_scale,
+                                           const int16_t* in_vector2,
+                                           int16_t in_vector2_scale,
+                                           int right_shifts,
+                                           int16_t* out_vector,
+                                           size_t length) {
+  size_t i = 0;
+  int round_value = (1 << right_shifts) >> 1;
+
+  if (in_vector1 == NULL || in_vector2 == NULL || out_vector == NULL ||
+      length == 0 || right_shifts < 0) {
+    return -1;
+  }
+
+  for (i = 0; i < length; i++) {
+    out_vector[i] = (int16_t)((
+        in_vector1[i] * in_vector1_scale + in_vector2[i] * in_vector2_scale +
+        round_value) >> right_shifts);
+  }
+
+  return 0;
+}
diff --git a/third_party/libwebrtc/common_audio/signal_processing/vector_scaling_operations_mips.c b/third_party/libwebrtc/common_audio/signal_processing/vector_scaling_operations_mips.c
new file mode 100644
index 0000000000..ba2d26d422
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/vector_scaling_operations_mips.c
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains implementations of the functions
+ * WebRtcSpl_ScaleAndAddVectorsWithRound_mips()
+ */
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+int WebRtcSpl_ScaleAndAddVectorsWithRound_mips(const int16_t* in_vector1,
+                                               int16_t in_vector1_scale,
+                                               const int16_t* in_vector2,
+                                               int16_t in_vector2_scale,
+                                               int right_shifts,
+                                               int16_t* out_vector,
+                                               size_t length) {
+  int16_t r0 = 0, r1 = 0;
+  int16_t *in1 = (int16_t*)in_vector1;
+  int16_t *in2 = (int16_t*)in_vector2;
+  int16_t *out = out_vector;
+  size_t i = 0;
+  int value32 = 0;
+
+  if (in_vector1 == NULL || in_vector2 == NULL || out_vector == NULL ||
+      length == 0 || right_shifts < 0) {
+    return -1;
+  }
+  for (i = 0; i < length; i++) {
+    __asm __volatile (
+      "lh         %[r0],          0(%[in1])                               \n\t"
+      "lh         %[r1],          0(%[in2])                               \n\t"
+      "mult       %[r0],          %[in_vector1_scale]                     \n\t"
+      "madd       %[r1],          %[in_vector2_scale]                     \n\t"
+      "extrv_r.w  %[value32],     $ac0,               %[right_shifts]     \n\t"
+      "addiu      %[in1],         %[in1],             2                   \n\t"
+      "addiu      %[in2],         %[in2],             2                   \n\t"
+      "sh         %[value32],     0(%[out])                               \n\t"
+      "addiu      %[out],         %[out],             2                   \n\t"
+      : [value32] "=&r" (value32), [out] "+r" (out), [in1] "+r" (in1),
+        [in2] "+r" (in2), [r0] "=&r" (r0), [r1] "=&r" (r1)
+      : [in_vector1_scale] "r" (in_vector1_scale),
+        [in_vector2_scale] "r" (in_vector2_scale),
+        [right_shifts] "r" (right_shifts)
+      : "hi", "lo", "memory"
+    );
+  }
+  return 0;
+}
diff --git a/third_party/libwebrtc/common_audio/sinc_resampler_gn/moz.build b/third_party/libwebrtc/common_audio/sinc_resampler_gn/moz.build
new file mode 100644
index 0000000000..cda88c03f9
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/sinc_resampler_gn/moz.build
@@ -0,0 +1,220 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("sinc_resampler_gn")
diff --git a/third_party/libwebrtc/common_audio/smoothing_filter.cc b/third_party/libwebrtc/common_audio/smoothing_filter.cc
new file mode 100644
index 0000000000..eaaf3a0033
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/smoothing_filter.cc
@@ -0,0 +1,147 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/smoothing_filter.h"
+
+#include <math.h>
+
+#include <cmath>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/time_utils.h"
+
+namespace webrtc {
+
+SmoothingFilterImpl::SmoothingFilterImpl(int init_time_ms)
+    : init_time_ms_(init_time_ms),
+      // Duing the initalization time, we use an increasing alpha. Specifically,
+      //   alpha(n) = exp(-powf(init_factor_, n)),
+      // where `init_factor_` is chosen such that
+      //   alpha(init_time_ms_) = exp(-1.0f / init_time_ms_),
+      init_factor_(init_time_ms_ == 0
+                       ? 0.0f
+                       : powf(init_time_ms_, -1.0f / init_time_ms_)),
+      // `init_const_` is to a factor to help the calculation during
+      // initialization phase.
+      init_const_(init_time_ms_ == 0
+                      ? 0.0f
+                      : init_time_ms_ -
+                            powf(init_time_ms_, 1.0f - 1.0f / init_time_ms_)) {
+  UpdateAlpha(init_time_ms_);
+}
+
+SmoothingFilterImpl::~SmoothingFilterImpl() = default;
+
+void SmoothingFilterImpl::AddSample(float sample) {
+  const int64_t now_ms = rtc::TimeMillis();
+
+  if (!init_end_time_ms_) {
+    // This is equivalent to assuming the filter has been receiving the same
+    // value as the first sample since time -infinity.
+    state_ = last_sample_ = sample;
+    init_end_time_ms_ = now_ms + init_time_ms_;
+    last_state_time_ms_ = now_ms;
+    return;
+  }
+
+  ExtrapolateLastSample(now_ms);
+  last_sample_ = sample;
+}
+
+absl::optional<float> SmoothingFilterImpl::GetAverage() {
+  if (!init_end_time_ms_) {
+    // `init_end_time_ms_` undefined since we have not received any sample.
+    return absl::nullopt;
+  }
+  ExtrapolateLastSample(rtc::TimeMillis());
+  return state_;
+}
+
+bool SmoothingFilterImpl::SetTimeConstantMs(int time_constant_ms) {
+  if (!init_end_time_ms_ || last_state_time_ms_ < *init_end_time_ms_) {
+    return false;
+  }
+  UpdateAlpha(time_constant_ms);
+  return true;
+}
+
+void SmoothingFilterImpl::UpdateAlpha(int time_constant_ms) {
+  alpha_ = time_constant_ms == 0 ? 0.0f : std::exp(-1.0f / time_constant_ms);
+}
+
+void SmoothingFilterImpl::ExtrapolateLastSample(int64_t time_ms) {
+  RTC_DCHECK_GE(time_ms, last_state_time_ms_);
+  RTC_DCHECK(init_end_time_ms_);
+
+  float multiplier = 0.0f;
+
+  if (time_ms <= *init_end_time_ms_) {
+    // Current update is to be made during initialization phase.
+    // We update the state as if the `alpha` has been increased according
+    //   alpha(n) = exp(-powf(init_factor_, n)),
+    // where n is the time (in millisecond) since the first sample received.
+    // With algebraic derivation as shown in the Appendix, we can find that the
+    // state can be updated in a similar manner as if alpha is a constant,
+    // except for a different multiplier.
+    if (init_time_ms_ == 0) {
+      // This means `init_factor_` = 0.
+      multiplier = 0.0f;
+    } else if (init_time_ms_ == 1) {
+      // This means `init_factor_` = 1.
+      multiplier = std::exp(last_state_time_ms_ - time_ms);
+    } else {
+      multiplier = std::exp(
+          -(powf(init_factor_, last_state_time_ms_ - *init_end_time_ms_) -
+            powf(init_factor_, time_ms - *init_end_time_ms_)) /
+          init_const_);
+    }
+  } else {
+    if (last_state_time_ms_ < *init_end_time_ms_) {
+      // The latest state update was made during initialization phase.
+      // We first extrapolate to the initialization time.
+      ExtrapolateLastSample(*init_end_time_ms_);
+      // Then extrapolate the rest by the following.
+    }
+    multiplier = powf(alpha_, time_ms - last_state_time_ms_);
+  }
+
+  state_ = multiplier * state_ + (1.0f - multiplier) * last_sample_;
+  last_state_time_ms_ = time_ms;
+}
+
+}  // namespace webrtc
+
+// Appendix: derivation of extrapolation during initialization phase.
+// (LaTeX syntax)
+// Assuming
+//   \begin{align}
+//     y(n) &= \alpha_{n-1} y(n-1) + \left(1 - \alpha_{n-1}\right) x(m) \\*
+//          &= \left(\prod_{i=m}^{n-1} \alpha_i\right) y(m) +
+//             \left(1 - \prod_{i=m}^{n-1} \alpha_i \right) x(m)
+//   \end{align}
+// Taking $\alpha_{n} = \exp(-\gamma^n)$, $\gamma$ denotes init\_factor\_, the
+// multiplier becomes
+//   \begin{align}
+//     \prod_{i=m}^{n-1} \alpha_i
+//     &= \exp\left(-\sum_{i=m}^{n-1} \gamma^i \right) \\*
+//     &= \begin{cases}
+//          \exp\left(-\frac{\gamma^m - \gamma^n}{1 - \gamma} \right)
+//          & \gamma \neq 1 \\*
+//          m-n & \gamma = 1
+//        \end{cases}
+//   \end{align}
+// We know $\gamma = T^{-\frac{1}{T}}$, where $T$ denotes init\_time\_ms\_. Then
+// $1 - \gamma$ approaches zero when $T$ increases. This can cause numerical
+// difficulties. We multiply $T$ (if $T > 0$) to both numerator and denominator
+// in the fraction. See.
+//   \begin{align}
+//     \frac{\gamma^m - \gamma^n}{1 - \gamma}
+//     &= \frac{T^\frac{T-m}{T} - T^\frac{T-n}{T}}{T - T^{1-\frac{1}{T}}}
+//   \end{align}
diff --git a/third_party/libwebrtc/common_audio/smoothing_filter.h b/third_party/libwebrtc/common_audio/smoothing_filter.h
new file mode 100644
index 0000000000..3419de7db3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/smoothing_filter.h
@@ -0,0 +1,75 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_SMOOTHING_FILTER_H_
+#define COMMON_AUDIO_SMOOTHING_FILTER_H_
+
+#include <stdint.h>
+
+#include "absl/types/optional.h"
+
+namespace webrtc {
+
+class SmoothingFilter {
+ public:
+  virtual ~SmoothingFilter() = default;
+  virtual void AddSample(float sample) = 0;
+  virtual absl::optional<float> GetAverage() = 0;
+  virtual bool SetTimeConstantMs(int time_constant_ms) = 0;
+};
+
+// SmoothingFilterImpl applies an exponential filter
+//   alpha = exp(-1.0 / time_constant_ms);
+//   y[t] = alpha * y[t-1] + (1 - alpha) * sample;
+// This implies a sample rate of 1000 Hz, i.e., 1 sample / ms.
+// But SmoothingFilterImpl allows sparse samples. All missing samples will be
+// assumed to equal the last received sample.
+class SmoothingFilterImpl final : public SmoothingFilter {
+ public:
+  // `init_time_ms` is initialization time. It defines a period starting from
+  // the arriving time of the first sample. During this period, the exponential
+  // filter uses a varying time constant so that a smaller time constant will be
+  // applied to the earlier samples. This is to allow the the filter to adapt to
+  // earlier samples quickly. After the initialization period, the time constant
+  // will be set to `init_time_ms` first and can be changed through
+  // `SetTimeConstantMs`.
+  explicit SmoothingFilterImpl(int init_time_ms);
+
+  SmoothingFilterImpl() = delete;
+  SmoothingFilterImpl(const SmoothingFilterImpl&) = delete;
+  SmoothingFilterImpl& operator=(const SmoothingFilterImpl&) = delete;
+
+  ~SmoothingFilterImpl() override;
+
+  void AddSample(float sample) override;
+  absl::optional<float> GetAverage() override;
+  bool SetTimeConstantMs(int time_constant_ms) override;
+
+  // Methods used for unittests.
+  float alpha() const { return alpha_; }
+
+ private:
+  void UpdateAlpha(int time_constant_ms);
+  void ExtrapolateLastSample(int64_t time_ms);
+
+  const int init_time_ms_;
+  const float init_factor_;
+  const float init_const_;
+
+  absl::optional<int64_t> init_end_time_ms_;
+  float last_sample_;
+  float alpha_;
+  float state_;
+  int64_t last_state_time_ms_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_SMOOTHING_FILTER_H_
diff --git a/third_party/libwebrtc/common_audio/smoothing_filter_unittest.cc b/third_party/libwebrtc/common_audio/smoothing_filter_unittest.cc
new file mode 100644
index 0000000000..47f6c717ec
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/smoothing_filter_unittest.cc
@@ -0,0 +1,165 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/smoothing_filter.h"
+
+#include <cmath>
+#include <memory>
+
+#include "rtc_base/fake_clock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+
+namespace {
+
+constexpr float kMaxAbsError = 1e-5f;
+constexpr int64_t kClockInitialTime = 123456;
+
+struct SmoothingFilterStates {
+  explicit SmoothingFilterStates(int init_time_ms)
+      : smoothing_filter(init_time_ms) {
+    fake_clock.AdvanceTime(TimeDelta::Millis(kClockInitialTime));
+  }
+  rtc::ScopedFakeClock fake_clock;
+  SmoothingFilterImpl smoothing_filter;
+};
+
+// This function does the following:
+//   1. Add a sample to filter at current clock,
+//   2. Advance the clock by `advance_time_ms`,
+//   3. Get the output of both SmoothingFilter and verify that it equals to an
+//      expected value.
+void CheckOutput(SmoothingFilterStates* states,
+                 float sample,
+                 int advance_time_ms,
+                 float expected_ouput) {
+  states->smoothing_filter.AddSample(sample);
+  states->fake_clock.AdvanceTime(TimeDelta::Millis(advance_time_ms));
+  auto output = states->smoothing_filter.GetAverage();
+  EXPECT_TRUE(output);
+  EXPECT_NEAR(expected_ouput, *output, kMaxAbsError);
+}
+
+}  // namespace
+
+TEST(SmoothingFilterTest, NoOutputWhenNoSampleAdded) {
+  constexpr int kInitTimeMs = 100;
+  SmoothingFilterStates states(kInitTimeMs);
+  EXPECT_FALSE(states.smoothing_filter.GetAverage());
+}
+
+// Python script to calculate the reference values used in this test.
+//   import math
+//
+//   class ExpFilter:
+//     def add_sample(self, new_value):
+//       self.state = self.state * self.alpha + (1.0 - self.alpha) * new_value
+//
+//   filter = ExpFilter()
+//   init_time = 795
+//   init_factor = (1.0 / init_time) ** (1.0 / init_time)
+//
+//   filter.state = 1.0
+//
+//   for time_now in range(1, 500):
+//     filter.alpha = math.exp(-init_factor ** time_now)
+//     filter.add_sample(1.0)
+//   print filter.state
+//
+//   for time_now in range(500, 600):
+//     filter.alpha = math.exp(-init_factor ** time_now)
+//     filter.add_sample(0.5)
+//   print filter.state
+//
+//   for time_now in range(600, 700):
+//     filter.alpha = math.exp(-init_factor ** time_now)
+//     filter.add_sample(1.0)
+//   print filter.state
+//
+//   for time_now in range(700, init_time):
+//     filter.alpha = math.exp(-init_factor ** time_now)
+//     filter.add_sample(1.0)
+//
+//   filter.alpha = math.exp(-1.0 / init_time)
+//   for time_now in range(init_time, 800):
+//     filter.add_sample(1.0)
+//   print filter.state
+//
+//   for i in range(800, 900):
+//     filter.add_sample(0.5)
+//   print filter.state
+//
+//   for i in range(900, 1000):
+//     filter.add_sample(1.0)
+//   print filter.state
+TEST(SmoothingFilterTest, CheckBehaviorAroundInitTime) {
+  constexpr int kInitTimeMs = 795;
+  SmoothingFilterStates states(kInitTimeMs);
+  CheckOutput(&states, 1.0f, 500, 1.0f);
+  CheckOutput(&states, 0.5f, 100, 0.680562264029f);
+  CheckOutput(&states, 1.0f, 100, 0.794207139813f);
+  // Next step will go across initialization time.
+  CheckOutput(&states, 1.0f, 100, 0.829803409752f);
+  CheckOutput(&states, 0.5f, 100, 0.790821764210f);
+  CheckOutput(&states, 1.0f, 100, 0.815545922911f);
+}
+
+TEST(SmoothingFilterTest, InitTimeEqualsZero) {
+  constexpr int kInitTimeMs = 0;
+  SmoothingFilterStates states(kInitTimeMs);
+  CheckOutput(&states, 1.0f, 1, 1.0f);
+  CheckOutput(&states, 0.5f, 1, 0.5f);
+}
+
+TEST(SmoothingFilterTest, InitTimeEqualsOne) {
+  constexpr int kInitTimeMs = 1;
+  SmoothingFilterStates states(kInitTimeMs);
+  CheckOutput(&states, 1.0f, 1, 1.0f);
+  CheckOutput(&states, 0.5f, 1,
+              1.0f * std::exp(-1.0f) + (1.0f - std::exp(-1.0f)) * 0.5f);
+}
+
+TEST(SmoothingFilterTest, GetAverageOutputsEmptyBeforeFirstSample) {
+  constexpr int kInitTimeMs = 100;
+  SmoothingFilterStates states(kInitTimeMs);
+  EXPECT_FALSE(states.smoothing_filter.GetAverage());
+  constexpr float kFirstSample = 1.2345f;
+  states.smoothing_filter.AddSample(kFirstSample);
+  EXPECT_EQ(kFirstSample, states.smoothing_filter.GetAverage());
+}
+
+TEST(SmoothingFilterTest, CannotChangeTimeConstantDuringInitialization) {
+  constexpr int kInitTimeMs = 100;
+  SmoothingFilterStates states(kInitTimeMs);
+  states.smoothing_filter.AddSample(0.0);
+
+  // During initialization, `SetTimeConstantMs` does not take effect.
+  states.fake_clock.AdvanceTime(TimeDelta::Millis(kInitTimeMs - 1));
+  states.smoothing_filter.AddSample(0.0);
+
+  EXPECT_FALSE(states.smoothing_filter.SetTimeConstantMs(kInitTimeMs * 2));
+  EXPECT_NE(std::exp(-1.0f / (kInitTimeMs * 2)),
+            states.smoothing_filter.alpha());
+
+  states.fake_clock.AdvanceTime(TimeDelta::Millis(1));
+  states.smoothing_filter.AddSample(0.0);
+  // When initialization finishes, the time constant should be come
+  // `kInitTimeConstantMs`.
+  EXPECT_FLOAT_EQ(std::exp(-1.0f / kInitTimeMs),
+                  states.smoothing_filter.alpha());
+
+  // After initialization, `SetTimeConstantMs` takes effect.
+  EXPECT_TRUE(states.smoothing_filter.SetTimeConstantMs(kInitTimeMs * 2));
+  EXPECT_FLOAT_EQ(std::exp(-1.0f / (kInitTimeMs * 2)),
+                  states.smoothing_filter.alpha());
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/BUILD.gn b/third_party/libwebrtc/common_audio/third_party/ooura/BUILD.gn
new file mode 100644
index 0000000000..a0ddf777db
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/BUILD.gn
@@ -0,0 +1,58 @@
+# Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the ../../../LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import("../../../webrtc.gni")
+
+rtc_library("fft_size_128") {
+  sources = [
+    "fft_size_128/ooura_fft.cc",
+    "fft_size_128/ooura_fft.h",
+    "fft_size_128/ooura_fft_tables_common.h",
+  ]
+  deps = [
+    "../../../rtc_base/system:arch",
+    "../../../system_wrappers",
+  ]
+  cflags = []
+
+  if (target_cpu == "x86" || target_cpu == "x64") {
+    sources += [
+      "fft_size_128/ooura_fft_sse2.cc",
+      "fft_size_128/ooura_fft_tables_neon_sse2.h",
+    ]
+    if (is_posix || is_fuchsia) {
+      cflags += [ "-msse2" ]
+    }
+  }
+
+  if (rtc_build_with_neon) {
+    sources += [
+      "fft_size_128/ooura_fft_neon.cc",
+      "fft_size_128/ooura_fft_tables_neon_sse2.h",
+    ]
+
+    deps += [ "../../../common_audio" ]
+
+    if (target_cpu != "arm64") {
+      # Enable compilation for the NEON instruction set.
+      suppressed_configs += [ "//build/config/compiler:compiler_arm_fpu" ]
+      cflags += [ "-mfpu=neon" ]
+    }
+  }
+
+  if (target_cpu == "mipsel" && mips_float_abi == "hard") {
+    sources += [ "fft_size_128/ooura_fft_mips.cc" ]
+  }
+}
+
+rtc_library("fft_size_256") {
+  sources = [
+    "fft_size_256/fft4g.cc",
+    "fft_size_256/fft4g.h",
+  ]
+}
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/LICENSE b/third_party/libwebrtc/common_audio/third_party/ooura/LICENSE
new file mode 100644
index 0000000000..3bf870aa3c
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/LICENSE
@@ -0,0 +1,8 @@
+/*
+ * http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
+ * Copyright Takuya OOURA, 1996-2001
+ *
+ * You may use, copy, modify and distribute this code for any purpose (include
+ * commercial use) and without fee. Please refer to this package when you modify
+ * this code.
+ */
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/README.chromium b/third_party/libwebrtc/common_audio/third_party/ooura/README.chromium
new file mode 100644
index 0000000000..459df13042
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/README.chromium
@@ -0,0 +1,14 @@
+Name: General Purpose FFT (Fast Fourier/Cosine/Sine Transform) Package
+Short Name: fft4g
+URL: http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
+Version: 0
+Date: 2018-06-19
+License: Custome license
+License File: LICENSE
+Security Critical: yes
+Shipped: yes
+
+Description:
+This is a package to calculate Discrete Fourier/Cosine/Sine Transforms of
+1-dimensional sequences of length 2^N. This package contains C and Fortran
+FFT codes.
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc
new file mode 100644
index 0000000000..693312012b
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc
@@ -0,0 +1,548 @@
+/*
+ * http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
+ * Copyright Takuya OOURA, 1996-2001
+ *
+ * You may use, copy, modify and distribute this code for any purpose (include
+ * commercial use) and without fee. Please refer to this package when you modify
+ * this code.
+ *
+ * Changes by the WebRTC authors:
+ *    - Trivial type modifications.
+ *    - Minimal code subset to do rdft of length 128.
+ *    - Optimizations because of known length.
+ *    - Removed the global variables by moving the code in to a class in order
+ *      to make it thread safe.
+ *
+ *  All changes are covered by the WebRTC license and IP grant:
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft.h"
+
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_common.h"
+#include "rtc_base/system/arch.h"
+#include "system_wrappers/include/cpu_features_wrapper.h"
+
+namespace webrtc {
+
+namespace {
+
+#if !(defined(MIPS_FPU_LE) || defined(WEBRTC_HAS_NEON))
+static void cft1st_128_C(float* a) {
+  const int n = 128;
+  int j, k1, k2;
+  float wk1r, wk1i, wk2r, wk2i, wk3r, wk3i;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  // The processing of the first set of elements was simplified in C to avoid
+  // some operations (multiplication by zero or one, addition of two elements
+  // multiplied by the same weight, ...).
+  x0r = a[0] + a[2];
+  x0i = a[1] + a[3];
+  x1r = a[0] - a[2];
+  x1i = a[1] - a[3];
+  x2r = a[4] + a[6];
+  x2i = a[5] + a[7];
+  x3r = a[4] - a[6];
+  x3i = a[5] - a[7];
+  a[0] = x0r + x2r;
+  a[1] = x0i + x2i;
+  a[4] = x0r - x2r;
+  a[5] = x0i - x2i;
+  a[2] = x1r - x3i;
+  a[3] = x1i + x3r;
+  a[6] = x1r + x3i;
+  a[7] = x1i - x3r;
+  wk1r = rdft_w[2];
+  x0r = a[8] + a[10];
+  x0i = a[9] + a[11];
+  x1r = a[8] - a[10];
+  x1i = a[9] - a[11];
+  x2r = a[12] + a[14];
+  x2i = a[13] + a[15];
+  x3r = a[12] - a[14];
+  x3i = a[13] - a[15];
+  a[8] = x0r + x2r;
+  a[9] = x0i + x2i;
+  a[12] = x2i - x0i;
+  a[13] = x0r - x2r;
+  x0r = x1r - x3i;
+  x0i = x1i + x3r;
+  a[10] = wk1r * (x0r - x0i);
+  a[11] = wk1r * (x0r + x0i);
+  x0r = x3i + x1r;
+  x0i = x3r - x1i;
+  a[14] = wk1r * (x0i - x0r);
+  a[15] = wk1r * (x0i + x0r);
+  k1 = 0;
+  for (j = 16; j < n; j += 16) {
+    k1 += 2;
+    k2 = 2 * k1;
+    wk2r = rdft_w[k1 + 0];
+    wk2i = rdft_w[k1 + 1];
+    wk1r = rdft_w[k2 + 0];
+    wk1i = rdft_w[k2 + 1];
+    wk3r = rdft_wk3ri_first[k1 + 0];
+    wk3i = rdft_wk3ri_first[k1 + 1];
+    x0r = a[j + 0] + a[j + 2];
+    x0i = a[j + 1] + a[j + 3];
+    x1r = a[j + 0] - a[j + 2];
+    x1i = a[j + 1] - a[j + 3];
+    x2r = a[j + 4] + a[j + 6];
+    x2i = a[j + 5] + a[j + 7];
+    x3r = a[j + 4] - a[j + 6];
+    x3i = a[j + 5] - a[j + 7];
+    a[j + 0] = x0r + x2r;
+    a[j + 1] = x0i + x2i;
+    x0r -= x2r;
+    x0i -= x2i;
+    a[j + 4] = wk2r * x0r - wk2i * x0i;
+    a[j + 5] = wk2r * x0i + wk2i * x0r;
+    x0r = x1r - x3i;
+    x0i = x1i + x3r;
+    a[j + 2] = wk1r * x0r - wk1i * x0i;
+    a[j + 3] = wk1r * x0i + wk1i * x0r;
+    x0r = x1r + x3i;
+    x0i = x1i - x3r;
+    a[j + 6] = wk3r * x0r - wk3i * x0i;
+    a[j + 7] = wk3r * x0i + wk3i * x0r;
+    wk1r = rdft_w[k2 + 2];
+    wk1i = rdft_w[k2 + 3];
+    wk3r = rdft_wk3ri_second[k1 + 0];
+    wk3i = rdft_wk3ri_second[k1 + 1];
+    x0r = a[j + 8] + a[j + 10];
+    x0i = a[j + 9] + a[j + 11];
+    x1r = a[j + 8] - a[j + 10];
+    x1i = a[j + 9] - a[j + 11];
+    x2r = a[j + 12] + a[j + 14];
+    x2i = a[j + 13] + a[j + 15];
+    x3r = a[j + 12] - a[j + 14];
+    x3i = a[j + 13] - a[j + 15];
+    a[j + 8] = x0r + x2r;
+    a[j + 9] = x0i + x2i;
+    x0r -= x2r;
+    x0i -= x2i;
+    a[j + 12] = -wk2i * x0r - wk2r * x0i;
+    a[j + 13] = -wk2i * x0i + wk2r * x0r;
+    x0r = x1r - x3i;
+    x0i = x1i + x3r;
+    a[j + 10] = wk1r * x0r - wk1i * x0i;
+    a[j + 11] = wk1r * x0i + wk1i * x0r;
+    x0r = x1r + x3i;
+    x0i = x1i - x3r;
+    a[j + 14] = wk3r * x0r - wk3i * x0i;
+    a[j + 15] = wk3r * x0i + wk3i * x0r;
+  }
+}
+
+static void cftmdl_128_C(float* a) {
+  const int l = 8;
+  const int n = 128;
+  const int m = 32;
+  int j0, j1, j2, j3, k, k1, k2, m2;
+  float wk1r, wk1i, wk2r, wk2i, wk3r, wk3i;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  for (j0 = 0; j0 < l; j0 += 2) {
+    j1 = j0 + 8;
+    j2 = j0 + 16;
+    j3 = j0 + 24;
+    x0r = a[j0 + 0] + a[j1 + 0];
+    x0i = a[j0 + 1] + a[j1 + 1];
+    x1r = a[j0 + 0] - a[j1 + 0];
+    x1i = a[j0 + 1] - a[j1 + 1];
+    x2r = a[j2 + 0] + a[j3 + 0];
+    x2i = a[j2 + 1] + a[j3 + 1];
+    x3r = a[j2 + 0] - a[j3 + 0];
+    x3i = a[j2 + 1] - a[j3 + 1];
+    a[j0 + 0] = x0r + x2r;
+    a[j0 + 1] = x0i + x2i;
+    a[j2 + 0] = x0r - x2r;
+    a[j2 + 1] = x0i - x2i;
+    a[j1 + 0] = x1r - x3i;
+    a[j1 + 1] = x1i + x3r;
+    a[j3 + 0] = x1r + x3i;
+    a[j3 + 1] = x1i - x3r;
+  }
+  wk1r = rdft_w[2];
+  for (j0 = m; j0 < l + m; j0 += 2) {
+    j1 = j0 + 8;
+    j2 = j0 + 16;
+    j3 = j0 + 24;
+    x0r = a[j0 + 0] + a[j1 + 0];
+    x0i = a[j0 + 1] + a[j1 + 1];
+    x1r = a[j0 + 0] - a[j1 + 0];
+    x1i = a[j0 + 1] - a[j1 + 1];
+    x2r = a[j2 + 0] + a[j3 + 0];
+    x2i = a[j2 + 1] + a[j3 + 1];
+    x3r = a[j2 + 0] - a[j3 + 0];
+    x3i = a[j2 + 1] - a[j3 + 1];
+    a[j0 + 0] = x0r + x2r;
+    a[j0 + 1] = x0i + x2i;
+    a[j2 + 0] = x2i - x0i;
+    a[j2 + 1] = x0r - x2r;
+    x0r = x1r - x3i;
+    x0i = x1i + x3r;
+    a[j1 + 0] = wk1r * (x0r - x0i);
+    a[j1 + 1] = wk1r * (x0r + x0i);
+    x0r = x3i + x1r;
+    x0i = x3r - x1i;
+    a[j3 + 0] = wk1r * (x0i - x0r);
+    a[j3 + 1] = wk1r * (x0i + x0r);
+  }
+  k1 = 0;
+  m2 = 2 * m;
+  for (k = m2; k < n; k += m2) {
+    k1 += 2;
+    k2 = 2 * k1;
+    wk2r = rdft_w[k1 + 0];
+    wk2i = rdft_w[k1 + 1];
+    wk1r = rdft_w[k2 + 0];
+    wk1i = rdft_w[k2 + 1];
+    wk3r = rdft_wk3ri_first[k1 + 0];
+    wk3i = rdft_wk3ri_first[k1 + 1];
+    for (j0 = k; j0 < l + k; j0 += 2) {
+      j1 = j0 + 8;
+      j2 = j0 + 16;
+      j3 = j0 + 24;
+      x0r = a[j0 + 0] + a[j1 + 0];
+      x0i = a[j0 + 1] + a[j1 + 1];
+      x1r = a[j0 + 0] - a[j1 + 0];
+      x1i = a[j0 + 1] - a[j1 + 1];
+      x2r = a[j2 + 0] + a[j3 + 0];
+      x2i = a[j2 + 1] + a[j3 + 1];
+      x3r = a[j2 + 0] - a[j3 + 0];
+      x3i = a[j2 + 1] - a[j3 + 1];
+      a[j0 + 0] = x0r + x2r;
+      a[j0 + 1] = x0i + x2i;
+      x0r -= x2r;
+      x0i -= x2i;
+      a[j2 + 0] = wk2r * x0r - wk2i * x0i;
+      a[j2 + 1] = wk2r * x0i + wk2i * x0r;
+      x0r = x1r - x3i;
+      x0i = x1i + x3r;
+      a[j1 + 0] = wk1r * x0r - wk1i * x0i;
+      a[j1 + 1] = wk1r * x0i + wk1i * x0r;
+      x0r = x1r + x3i;
+      x0i = x1i - x3r;
+      a[j3 + 0] = wk3r * x0r - wk3i * x0i;
+      a[j3 + 1] = wk3r * x0i + wk3i * x0r;
+    }
+    wk1r = rdft_w[k2 + 2];
+    wk1i = rdft_w[k2 + 3];
+    wk3r = rdft_wk3ri_second[k1 + 0];
+    wk3i = rdft_wk3ri_second[k1 + 1];
+    for (j0 = k + m; j0 < l + (k + m); j0 += 2) {
+      j1 = j0 + 8;
+      j2 = j0 + 16;
+      j3 = j0 + 24;
+      x0r = a[j0 + 0] + a[j1 + 0];
+      x0i = a[j0 + 1] + a[j1 + 1];
+      x1r = a[j0 + 0] - a[j1 + 0];
+      x1i = a[j0 + 1] - a[j1 + 1];
+      x2r = a[j2 + 0] + a[j3 + 0];
+      x2i = a[j2 + 1] + a[j3 + 1];
+      x3r = a[j2 + 0] - a[j3 + 0];
+      x3i = a[j2 + 1] - a[j3 + 1];
+      a[j0 + 0] = x0r + x2r;
+      a[j0 + 1] = x0i + x2i;
+      x0r -= x2r;
+      x0i -= x2i;
+      a[j2 + 0] = -wk2i * x0r - wk2r * x0i;
+      a[j2 + 1] = -wk2i * x0i + wk2r * x0r;
+      x0r = x1r - x3i;
+      x0i = x1i + x3r;
+      a[j1 + 0] = wk1r * x0r - wk1i * x0i;
+      a[j1 + 1] = wk1r * x0i + wk1i * x0r;
+      x0r = x1r + x3i;
+      x0i = x1i - x3r;
+      a[j3 + 0] = wk3r * x0r - wk3i * x0i;
+      a[j3 + 1] = wk3r * x0i + wk3i * x0r;
+    }
+  }
+}
+
+static void rftfsub_128_C(float* a) {
+  const float* c = rdft_w + 32;
+  int j1, j2, k1, k2;
+  float wkr, wki, xr, xi, yr, yi;
+
+  for (j1 = 1, j2 = 2; j2 < 64; j1 += 1, j2 += 2) {
+    k2 = 128 - j2;
+    k1 = 32 - j1;
+    wkr = 0.5f - c[k1];
+    wki = c[j1];
+    xr = a[j2 + 0] - a[k2 + 0];
+    xi = a[j2 + 1] + a[k2 + 1];
+    yr = wkr * xr - wki * xi;
+    yi = wkr * xi + wki * xr;
+    a[j2 + 0] -= yr;
+    a[j2 + 1] -= yi;
+    a[k2 + 0] += yr;
+    a[k2 + 1] -= yi;
+  }
+}
+
+static void rftbsub_128_C(float* a) {
+  const float* c = rdft_w + 32;
+  int j1, j2, k1, k2;
+  float wkr, wki, xr, xi, yr, yi;
+
+  a[1] = -a[1];
+  for (j1 = 1, j2 = 2; j2 < 64; j1 += 1, j2 += 2) {
+    k2 = 128 - j2;
+    k1 = 32 - j1;
+    wkr = 0.5f - c[k1];
+    wki = c[j1];
+    xr = a[j2 + 0] - a[k2 + 0];
+    xi = a[j2 + 1] + a[k2 + 1];
+    yr = wkr * xr + wki * xi;
+    yi = wkr * xi - wki * xr;
+    a[j2 + 0] = a[j2 + 0] - yr;
+    a[j2 + 1] = yi - a[j2 + 1];
+    a[k2 + 0] = yr + a[k2 + 0];
+    a[k2 + 1] = yi - a[k2 + 1];
+  }
+  a[65] = -a[65];
+}
+#endif
+
+}  // namespace
+
+OouraFft::OouraFft(bool sse2_available) {
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+  use_sse2_ = sse2_available;
+#else
+  use_sse2_ = false;
+#endif
+}
+
+OouraFft::OouraFft() {
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+  use_sse2_ = (GetCPUInfo(kSSE2) != 0);
+#else
+  use_sse2_ = false;
+#endif
+}
+
+OouraFft::~OouraFft() = default;
+
+void OouraFft::Fft(float* a) const {
+  float xi;
+  bitrv2_128(a);
+  cftfsub_128(a);
+  rftfsub_128(a);
+  xi = a[0] - a[1];
+  a[0] += a[1];
+  a[1] = xi;
+}
+void OouraFft::InverseFft(float* a) const {
+  a[1] = 0.5f * (a[0] - a[1]);
+  a[0] -= a[1];
+  rftbsub_128(a);
+  bitrv2_128(a);
+  cftbsub_128(a);
+}
+
+void OouraFft::cft1st_128(float* a) const {
+#if defined(MIPS_FPU_LE)
+  cft1st_128_mips(a);
+#elif defined(WEBRTC_HAS_NEON)
+  cft1st_128_neon(a);
+#elif defined(WEBRTC_ARCH_X86_FAMILY)
+  if (use_sse2_) {
+    cft1st_128_SSE2(a);
+  } else {
+    cft1st_128_C(a);
+  }
+#else
+  cft1st_128_C(a);
+#endif
+}
+void OouraFft::cftmdl_128(float* a) const {
+#if defined(MIPS_FPU_LE)
+  cftmdl_128_mips(a);
+#elif defined(WEBRTC_HAS_NEON)
+  cftmdl_128_neon(a);
+#elif defined(WEBRTC_ARCH_X86_FAMILY)
+  if (use_sse2_) {
+    cftmdl_128_SSE2(a);
+  } else {
+    cftmdl_128_C(a);
+  }
+#else
+  cftmdl_128_C(a);
+#endif
+}
+void OouraFft::rftfsub_128(float* a) const {
+#if defined(MIPS_FPU_LE)
+  rftfsub_128_mips(a);
+#elif defined(WEBRTC_HAS_NEON)
+  rftfsub_128_neon(a);
+#elif defined(WEBRTC_ARCH_X86_FAMILY)
+  if (use_sse2_) {
+    rftfsub_128_SSE2(a);
+  } else {
+    rftfsub_128_C(a);
+  }
+#else
+  rftfsub_128_C(a);
+#endif
+}
+
+void OouraFft::rftbsub_128(float* a) const {
+#if defined(MIPS_FPU_LE)
+  rftbsub_128_mips(a);
+#elif defined(WEBRTC_HAS_NEON)
+  rftbsub_128_neon(a);
+#elif defined(WEBRTC_ARCH_X86_FAMILY)
+  if (use_sse2_) {
+    rftbsub_128_SSE2(a);
+  } else {
+    rftbsub_128_C(a);
+  }
+#else
+  rftbsub_128_C(a);
+#endif
+}
+
+void OouraFft::cftbsub_128(float* a) const {
+  int j, j1, j2, j3, l;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  cft1st_128(a);
+  cftmdl_128(a);
+  l = 32;
+
+  for (j = 0; j < l; j += 2) {
+    j1 = j + l;
+    j2 = j1 + l;
+    j3 = j2 + l;
+    x0r = a[j] + a[j1];
+    x0i = -a[j + 1] - a[j1 + 1];
+    x1r = a[j] - a[j1];
+    x1i = -a[j + 1] + a[j1 + 1];
+    x2r = a[j2] + a[j3];
+    x2i = a[j2 + 1] + a[j3 + 1];
+    x3r = a[j2] - a[j3];
+    x3i = a[j2 + 1] - a[j3 + 1];
+    a[j] = x0r + x2r;
+    a[j + 1] = x0i - x2i;
+    a[j2] = x0r - x2r;
+    a[j2 + 1] = x0i + x2i;
+    a[j1] = x1r - x3i;
+    a[j1 + 1] = x1i - x3r;
+    a[j3] = x1r + x3i;
+    a[j3 + 1] = x1i + x3r;
+  }
+}
+
+void OouraFft::cftfsub_128(float* a) const {
+  int j, j1, j2, j3, l;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  cft1st_128(a);
+  cftmdl_128(a);
+  l = 32;
+  for (j = 0; j < l; j += 2) {
+    j1 = j + l;
+    j2 = j1 + l;
+    j3 = j2 + l;
+    x0r = a[j] + a[j1];
+    x0i = a[j + 1] + a[j1 + 1];
+    x1r = a[j] - a[j1];
+    x1i = a[j + 1] - a[j1 + 1];
+    x2r = a[j2] + a[j3];
+    x2i = a[j2 + 1] + a[j3 + 1];
+    x3r = a[j2] - a[j3];
+    x3i = a[j2 + 1] - a[j3 + 1];
+    a[j] = x0r + x2r;
+    a[j + 1] = x0i + x2i;
+    a[j2] = x0r - x2r;
+    a[j2 + 1] = x0i - x2i;
+    a[j1] = x1r - x3i;
+    a[j1 + 1] = x1i + x3r;
+    a[j3] = x1r + x3i;
+    a[j3 + 1] = x1i - x3r;
+  }
+}
+
+void OouraFft::bitrv2_128(float* a) const {
+  /*
+      Following things have been attempted but are no faster:
+      (a) Storing the swap indexes in a LUT (index calculations are done
+          for 'free' while waiting on memory/L1).
+      (b) Consolidate the load/store of two consecutive floats by a 64 bit
+          integer (execution is memory/L1 bound).
+      (c) Do a mix of floats and 64 bit integer to maximize register
+          utilization (execution is memory/L1 bound).
+      (d) Replacing ip[i] by ((k<<31)>>25) + ((k >> 1)<<5).
+      (e) Hard-coding of the offsets to completely eliminates index
+          calculations.
+  */
+
+  unsigned int j, j1, k, k1;
+  float xr, xi, yr, yi;
+
+  const int ip[4] = {0, 64, 32, 96};
+  for (k = 0; k < 4; k++) {
+    for (j = 0; j < k; j++) {
+      j1 = 2 * j + ip[k];
+      k1 = 2 * k + ip[j];
+      xr = a[j1 + 0];
+      xi = a[j1 + 1];
+      yr = a[k1 + 0];
+      yi = a[k1 + 1];
+      a[j1 + 0] = yr;
+      a[j1 + 1] = yi;
+      a[k1 + 0] = xr;
+      a[k1 + 1] = xi;
+      j1 += 8;
+      k1 += 16;
+      xr = a[j1 + 0];
+      xi = a[j1 + 1];
+      yr = a[k1 + 0];
+      yi = a[k1 + 1];
+      a[j1 + 0] = yr;
+      a[j1 + 1] = yi;
+      a[k1 + 0] = xr;
+      a[k1 + 1] = xi;
+      j1 += 8;
+      k1 -= 8;
+      xr = a[j1 + 0];
+      xi = a[j1 + 1];
+      yr = a[k1 + 0];
+      yi = a[k1 + 1];
+      a[j1 + 0] = yr;
+      a[j1 + 1] = yi;
+      a[k1 + 0] = xr;
+      a[k1 + 1] = xi;
+      j1 += 8;
+      k1 += 16;
+      xr = a[j1 + 0];
+      xi = a[j1 + 1];
+      yr = a[k1 + 0];
+      yi = a[k1 + 1];
+      a[j1 + 0] = yr;
+      a[j1 + 1] = yi;
+      a[k1 + 0] = xr;
+      a[k1 + 1] = xi;
+    }
+    j1 = 2 * k + 8 + ip[k];
+    k1 = j1 + 8;
+    xr = a[j1 + 0];
+    xi = a[j1 + 1];
+    yr = a[k1 + 0];
+    yi = a[k1 + 1];
+    a[j1 + 0] = yr;
+    a[j1 + 1] = yi;
+    a[k1 + 0] = xr;
+    a[k1 + 1] = xi;
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft.h b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft.h
new file mode 100644
index 0000000000..8273dfe58e
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft.h
@@ -0,0 +1,64 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_H_
+#define MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_H_
+
+#include "rtc_base/system/arch.h"
+
+namespace webrtc {
+
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+void cft1st_128_SSE2(float* a);
+void cftmdl_128_SSE2(float* a);
+void rftfsub_128_SSE2(float* a);
+void rftbsub_128_SSE2(float* a);
+#endif
+
+#if defined(MIPS_FPU_LE)
+void cft1st_128_mips(float* a);
+void cftmdl_128_mips(float* a);
+void rftfsub_128_mips(float* a);
+void rftbsub_128_mips(float* a);
+#endif
+
+#if defined(WEBRTC_HAS_NEON)
+void cft1st_128_neon(float* a);
+void cftmdl_128_neon(float* a);
+void rftfsub_128_neon(float* a);
+void rftbsub_128_neon(float* a);
+#endif
+
+class OouraFft {
+ public:
+  // Ctor allowing the availability of SSE2 support to be specified.
+  explicit OouraFft(bool sse2_available);
+
+  // Deprecated: This Ctor will soon be removed.
+  OouraFft();
+  ~OouraFft();
+  void Fft(float* a) const;
+  void InverseFft(float* a) const;
+
+ private:
+  void cft1st_128(float* a) const;
+  void cftmdl_128(float* a) const;
+  void rftfsub_128(float* a) const;
+  void rftbsub_128(float* a) const;
+
+  void cftfsub_128(float* a) const;
+  void cftbsub_128(float* a) const;
+  void bitrv2_128(float* a) const;
+  bool use_sse2_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_H_
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_mips.cc b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_mips.cc
new file mode 100644
index 0000000000..4c231e357d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_mips.cc
@@ -0,0 +1,1245 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft.h"
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_common.h"
+
+namespace webrtc {
+
+#if defined(MIPS_FPU_LE)
+void bitrv2_128_mips(float* a) {
+  // n is 128
+  float xr, xi, yr, yi;
+
+  xr = a[8];
+  xi = a[9];
+  yr = a[16];
+  yi = a[17];
+  a[8] = yr;
+  a[9] = yi;
+  a[16] = xr;
+  a[17] = xi;
+
+  xr = a[64];
+  xi = a[65];
+  yr = a[2];
+  yi = a[3];
+  a[64] = yr;
+  a[65] = yi;
+  a[2] = xr;
+  a[3] = xi;
+
+  xr = a[72];
+  xi = a[73];
+  yr = a[18];
+  yi = a[19];
+  a[72] = yr;
+  a[73] = yi;
+  a[18] = xr;
+  a[19] = xi;
+
+  xr = a[80];
+  xi = a[81];
+  yr = a[10];
+  yi = a[11];
+  a[80] = yr;
+  a[81] = yi;
+  a[10] = xr;
+  a[11] = xi;
+
+  xr = a[88];
+  xi = a[89];
+  yr = a[26];
+  yi = a[27];
+  a[88] = yr;
+  a[89] = yi;
+  a[26] = xr;
+  a[27] = xi;
+
+  xr = a[74];
+  xi = a[75];
+  yr = a[82];
+  yi = a[83];
+  a[74] = yr;
+  a[75] = yi;
+  a[82] = xr;
+  a[83] = xi;
+
+  xr = a[32];
+  xi = a[33];
+  yr = a[4];
+  yi = a[5];
+  a[32] = yr;
+  a[33] = yi;
+  a[4] = xr;
+  a[5] = xi;
+
+  xr = a[40];
+  xi = a[41];
+  yr = a[20];
+  yi = a[21];
+  a[40] = yr;
+  a[41] = yi;
+  a[20] = xr;
+  a[21] = xi;
+
+  xr = a[48];
+  xi = a[49];
+  yr = a[12];
+  yi = a[13];
+  a[48] = yr;
+  a[49] = yi;
+  a[12] = xr;
+  a[13] = xi;
+
+  xr = a[56];
+  xi = a[57];
+  yr = a[28];
+  yi = a[29];
+  a[56] = yr;
+  a[57] = yi;
+  a[28] = xr;
+  a[29] = xi;
+
+  xr = a[34];
+  xi = a[35];
+  yr = a[68];
+  yi = a[69];
+  a[34] = yr;
+  a[35] = yi;
+  a[68] = xr;
+  a[69] = xi;
+
+  xr = a[42];
+  xi = a[43];
+  yr = a[84];
+  yi = a[85];
+  a[42] = yr;
+  a[43] = yi;
+  a[84] = xr;
+  a[85] = xi;
+
+  xr = a[50];
+  xi = a[51];
+  yr = a[76];
+  yi = a[77];
+  a[50] = yr;
+  a[51] = yi;
+  a[76] = xr;
+  a[77] = xi;
+
+  xr = a[58];
+  xi = a[59];
+  yr = a[92];
+  yi = a[93];
+  a[58] = yr;
+  a[59] = yi;
+  a[92] = xr;
+  a[93] = xi;
+
+  xr = a[44];
+  xi = a[45];
+  yr = a[52];
+  yi = a[53];
+  a[44] = yr;
+  a[45] = yi;
+  a[52] = xr;
+  a[53] = xi;
+
+  xr = a[96];
+  xi = a[97];
+  yr = a[6];
+  yi = a[7];
+  a[96] = yr;
+  a[97] = yi;
+  a[6] = xr;
+  a[7] = xi;
+
+  xr = a[104];
+  xi = a[105];
+  yr = a[22];
+  yi = a[23];
+  a[104] = yr;
+  a[105] = yi;
+  a[22] = xr;
+  a[23] = xi;
+
+  xr = a[112];
+  xi = a[113];
+  yr = a[14];
+  yi = a[15];
+  a[112] = yr;
+  a[113] = yi;
+  a[14] = xr;
+  a[15] = xi;
+
+  xr = a[120];
+  xi = a[121];
+  yr = a[30];
+  yi = a[31];
+  a[120] = yr;
+  a[121] = yi;
+  a[30] = xr;
+  a[31] = xi;
+
+  xr = a[98];
+  xi = a[99];
+  yr = a[70];
+  yi = a[71];
+  a[98] = yr;
+  a[99] = yi;
+  a[70] = xr;
+  a[71] = xi;
+
+  xr = a[106];
+  xi = a[107];
+  yr = a[86];
+  yi = a[87];
+  a[106] = yr;
+  a[107] = yi;
+  a[86] = xr;
+  a[87] = xi;
+
+  xr = a[114];
+  xi = a[115];
+  yr = a[78];
+  yi = a[79];
+  a[114] = yr;
+  a[115] = yi;
+  a[78] = xr;
+  a[79] = xi;
+
+  xr = a[122];
+  xi = a[123];
+  yr = a[94];
+  yi = a[95];
+  a[122] = yr;
+  a[123] = yi;
+  a[94] = xr;
+  a[95] = xi;
+
+  xr = a[100];
+  xi = a[101];
+  yr = a[38];
+  yi = a[39];
+  a[100] = yr;
+  a[101] = yi;
+  a[38] = xr;
+  a[39] = xi;
+
+  xr = a[108];
+  xi = a[109];
+  yr = a[54];
+  yi = a[55];
+  a[108] = yr;
+  a[109] = yi;
+  a[54] = xr;
+  a[55] = xi;
+
+  xr = a[116];
+  xi = a[117];
+  yr = a[46];
+  yi = a[47];
+  a[116] = yr;
+  a[117] = yi;
+  a[46] = xr;
+  a[47] = xi;
+
+  xr = a[124];
+  xi = a[125];
+  yr = a[62];
+  yi = a[63];
+  a[124] = yr;
+  a[125] = yi;
+  a[62] = xr;
+  a[63] = xi;
+
+  xr = a[110];
+  xi = a[111];
+  yr = a[118];
+  yi = a[119];
+  a[110] = yr;
+  a[111] = yi;
+  a[118] = xr;
+  a[119] = xi;
+}
+
+void cft1st_128_mips(float* a) {
+  float f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14;
+  int a_ptr, p1_rdft, p2_rdft, count;
+  const float* first = rdft_wk3ri_first;
+  const float* second = rdft_wk3ri_second;
+
+  __asm __volatile(
+      ".set       push                                                    \n\t"
+      ".set       noreorder                                               \n\t"
+      // first 8
+      "lwc1       %[f0],        0(%[a])                                   \n\t"
+      "lwc1       %[f1],        4(%[a])                                   \n\t"
+      "lwc1       %[f2],        8(%[a])                                   \n\t"
+      "lwc1       %[f3],        12(%[a])                                  \n\t"
+      "lwc1       %[f4],        16(%[a])                                  \n\t"
+      "lwc1       %[f5],        20(%[a])                                  \n\t"
+      "lwc1       %[f6],        24(%[a])                                  \n\t"
+      "lwc1       %[f7],        28(%[a])                                  \n\t"
+      "add.s      %[f8],        %[f0],        %[f2]                       \n\t"
+      "sub.s      %[f0],        %[f0],        %[f2]                       \n\t"
+      "add.s      %[f2],        %[f4],        %[f6]                       \n\t"
+      "sub.s      %[f4],        %[f4],        %[f6]                       \n\t"
+      "add.s      %[f6],        %[f1],        %[f3]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f3]                       \n\t"
+      "add.s      %[f3],        %[f5],        %[f7]                       \n\t"
+      "sub.s      %[f5],        %[f5],        %[f7]                       \n\t"
+      "add.s      %[f7],        %[f8],        %[f2]                       \n\t"
+      "sub.s      %[f8],        %[f8],        %[f2]                       \n\t"
+      "sub.s      %[f2],        %[f1],        %[f4]                       \n\t"
+      "add.s      %[f1],        %[f1],        %[f4]                       \n\t"
+      "add.s      %[f4],        %[f6],        %[f3]                       \n\t"
+      "sub.s      %[f6],        %[f6],        %[f3]                       \n\t"
+      "sub.s      %[f3],        %[f0],        %[f5]                       \n\t"
+      "add.s      %[f0],        %[f0],        %[f5]                       \n\t"
+      "swc1       %[f7],        0(%[a])                                   \n\t"
+      "swc1       %[f8],        16(%[a])                                  \n\t"
+      "swc1       %[f2],        28(%[a])                                  \n\t"
+      "swc1       %[f1],        12(%[a])                                  \n\t"
+      "swc1       %[f4],        4(%[a])                                   \n\t"
+      "swc1       %[f6],        20(%[a])                                  \n\t"
+      "swc1       %[f3],        8(%[a])                                   \n\t"
+      "swc1       %[f0],        24(%[a])                                  \n\t"
+      // second 8
+      "lwc1       %[f0],        32(%[a])                                  \n\t"
+      "lwc1       %[f1],        36(%[a])                                  \n\t"
+      "lwc1       %[f2],        40(%[a])                                  \n\t"
+      "lwc1       %[f3],        44(%[a])                                  \n\t"
+      "lwc1       %[f4],        48(%[a])                                  \n\t"
+      "lwc1       %[f5],        52(%[a])                                  \n\t"
+      "lwc1       %[f6],        56(%[a])                                  \n\t"
+      "lwc1       %[f7],        60(%[a])                                  \n\t"
+      "add.s      %[f8],        %[f4],        %[f6]                       \n\t"
+      "sub.s      %[f4],        %[f4],        %[f6]                       \n\t"
+      "add.s      %[f6],        %[f1],        %[f3]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f3]                       \n\t"
+      "add.s      %[f3],        %[f0],        %[f2]                       \n\t"
+      "sub.s      %[f0],        %[f0],        %[f2]                       \n\t"
+      "add.s      %[f2],        %[f5],        %[f7]                       \n\t"
+      "sub.s      %[f5],        %[f5],        %[f7]                       \n\t"
+      "add.s      %[f7],        %[f4],        %[f1]                       \n\t"
+      "sub.s      %[f4],        %[f4],        %[f1]                       \n\t"
+      "add.s      %[f1],        %[f3],        %[f8]                       \n\t"
+      "sub.s      %[f3],        %[f3],        %[f8]                       \n\t"
+      "sub.s      %[f8],        %[f0],        %[f5]                       \n\t"
+      "add.s      %[f0],        %[f0],        %[f5]                       \n\t"
+      "add.s      %[f5],        %[f6],        %[f2]                       \n\t"
+      "sub.s      %[f6],        %[f2],        %[f6]                       \n\t"
+      "lwc1       %[f9],        8(%[rdft_w])                              \n\t"
+      "sub.s      %[f2],        %[f8],        %[f7]                       \n\t"
+      "add.s      %[f8],        %[f8],        %[f7]                       \n\t"
+      "sub.s      %[f7],        %[f4],        %[f0]                       \n\t"
+      "add.s      %[f4],        %[f4],        %[f0]                       \n\t"
+      // prepare for loop
+      "addiu      %[a_ptr],     %[a],         64                          \n\t"
+      "addiu      %[p1_rdft],   %[rdft_w],    8                           \n\t"
+      "addiu      %[p2_rdft],   %[rdft_w],    16                          \n\t"
+      "addiu      %[count],     $zero,        7                           \n\t"
+      // finish second 8
+      "mul.s      %[f2],        %[f9],        %[f2]                       \n\t"
+      "mul.s      %[f8],        %[f9],        %[f8]                       \n\t"
+      "mul.s      %[f7],        %[f9],        %[f7]                       \n\t"
+      "mul.s      %[f4],        %[f9],        %[f4]                       \n\t"
+      "swc1       %[f1],        32(%[a])                                  \n\t"
+      "swc1       %[f3],        52(%[a])                                  \n\t"
+      "swc1       %[f5],        36(%[a])                                  \n\t"
+      "swc1       %[f6],        48(%[a])                                  \n\t"
+      "swc1       %[f2],        40(%[a])                                  \n\t"
+      "swc1       %[f8],        44(%[a])                                  \n\t"
+      "swc1       %[f7],        56(%[a])                                  \n\t"
+      "swc1       %[f4],        60(%[a])                                  \n\t"
+      // loop
+      "1:                                                                  \n\t"
+      "lwc1       %[f0],        0(%[a_ptr])                               \n\t"
+      "lwc1       %[f1],        4(%[a_ptr])                               \n\t"
+      "lwc1       %[f2],        8(%[a_ptr])                               \n\t"
+      "lwc1       %[f3],        12(%[a_ptr])                              \n\t"
+      "lwc1       %[f4],        16(%[a_ptr])                              \n\t"
+      "lwc1       %[f5],        20(%[a_ptr])                              \n\t"
+      "lwc1       %[f6],        24(%[a_ptr])                              \n\t"
+      "lwc1       %[f7],        28(%[a_ptr])                              \n\t"
+      "add.s      %[f8],        %[f0],        %[f2]                       \n\t"
+      "sub.s      %[f0],        %[f0],        %[f2]                       \n\t"
+      "add.s      %[f2],        %[f4],        %[f6]                       \n\t"
+      "sub.s      %[f4],        %[f4],        %[f6]                       \n\t"
+      "add.s      %[f6],        %[f1],        %[f3]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f3]                       \n\t"
+      "add.s      %[f3],        %[f5],        %[f7]                       \n\t"
+      "sub.s      %[f5],        %[f5],        %[f7]                       \n\t"
+      "lwc1       %[f10],       4(%[p1_rdft])                             \n\t"
+      "lwc1       %[f11],       0(%[p2_rdft])                             \n\t"
+      "lwc1       %[f12],       4(%[p2_rdft])                             \n\t"
+      "lwc1       %[f13],       8(%[first])                               \n\t"
+      "lwc1       %[f14],       12(%[first])                              \n\t"
+      "add.s      %[f7],        %[f8],        %[f2]                       \n\t"
+      "sub.s      %[f8],        %[f8],        %[f2]                       \n\t"
+      "add.s      %[f2],        %[f6],        %[f3]                       \n\t"
+      "sub.s      %[f6],        %[f6],        %[f3]                       \n\t"
+      "add.s      %[f3],        %[f0],        %[f5]                       \n\t"
+      "sub.s      %[f0],        %[f0],        %[f5]                       \n\t"
+      "add.s      %[f5],        %[f1],        %[f4]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f4]                       \n\t"
+      "swc1       %[f7],        0(%[a_ptr])                               \n\t"
+      "swc1       %[f2],        4(%[a_ptr])                               \n\t"
+      "mul.s      %[f4],        %[f9],        %[f8]                       \n\t"
+#if defined(MIPS32_R2_LE)
+      "mul.s      %[f8],        %[f10],       %[f8]                       \n\t"
+      "mul.s      %[f7],        %[f11],       %[f0]                       \n\t"
+      "mul.s      %[f0],        %[f12],       %[f0]                       \n\t"
+      "mul.s      %[f2],        %[f13],       %[f3]                       \n\t"
+      "mul.s      %[f3],        %[f14],       %[f3]                       \n\t"
+      "nmsub.s    %[f4],        %[f4],        %[f10],       %[f6]         \n\t"
+      "madd.s     %[f8],        %[f8],        %[f9],        %[f6]         \n\t"
+      "nmsub.s    %[f7],        %[f7],        %[f12],       %[f5]         \n\t"
+      "madd.s     %[f0],        %[f0],        %[f11],       %[f5]         \n\t"
+      "nmsub.s    %[f2],        %[f2],        %[f14],       %[f1]         \n\t"
+      "madd.s     %[f3],        %[f3],        %[f13],       %[f1]         \n\t"
+#else
+      "mul.s      %[f7],        %[f10],       %[f6]                       \n\t"
+      "mul.s      %[f6],        %[f9],        %[f6]                       \n\t"
+      "mul.s      %[f8],        %[f10],       %[f8]                       \n\t"
+      "mul.s      %[f2],        %[f11],       %[f0]                       \n\t"
+      "mul.s      %[f11],       %[f11],       %[f5]                       \n\t"
+      "mul.s      %[f5],        %[f12],       %[f5]                       \n\t"
+      "mul.s      %[f0],        %[f12],       %[f0]                       \n\t"
+      "mul.s      %[f12],       %[f13],       %[f3]                       \n\t"
+      "mul.s      %[f13],       %[f13],       %[f1]                       \n\t"
+      "mul.s      %[f1],        %[f14],       %[f1]                       \n\t"
+      "mul.s      %[f3],        %[f14],       %[f3]                       \n\t"
+      "sub.s      %[f4],        %[f4],        %[f7]                       \n\t"
+      "add.s      %[f8],        %[f6],        %[f8]                       \n\t"
+      "sub.s      %[f7],        %[f2],        %[f5]                       \n\t"
+      "add.s      %[f0],        %[f11],       %[f0]                       \n\t"
+      "sub.s      %[f2],        %[f12],       %[f1]                       \n\t"
+      "add.s      %[f3],        %[f13],       %[f3]                       \n\t"
+#endif
+      "swc1       %[f4],        16(%[a_ptr])                              \n\t"
+      "swc1       %[f8],        20(%[a_ptr])                              \n\t"
+      "swc1       %[f7],        8(%[a_ptr])                               \n\t"
+      "swc1       %[f0],        12(%[a_ptr])                              \n\t"
+      "swc1       %[f2],        24(%[a_ptr])                              \n\t"
+      "swc1       %[f3],        28(%[a_ptr])                              \n\t"
+      "lwc1       %[f0],        32(%[a_ptr])                              \n\t"
+      "lwc1       %[f1],        36(%[a_ptr])                              \n\t"
+      "lwc1       %[f2],        40(%[a_ptr])                              \n\t"
+      "lwc1       %[f3],        44(%[a_ptr])                              \n\t"
+      "lwc1       %[f4],        48(%[a_ptr])                              \n\t"
+      "lwc1       %[f5],        52(%[a_ptr])                              \n\t"
+      "lwc1       %[f6],        56(%[a_ptr])                              \n\t"
+      "lwc1       %[f7],        60(%[a_ptr])                              \n\t"
+      "add.s      %[f8],        %[f0],        %[f2]                       \n\t"
+      "sub.s      %[f0],        %[f0],        %[f2]                       \n\t"
+      "add.s      %[f2],        %[f4],        %[f6]                       \n\t"
+      "sub.s      %[f4],        %[f4],        %[f6]                       \n\t"
+      "add.s      %[f6],        %[f1],        %[f3]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f3]                       \n\t"
+      "add.s      %[f3],        %[f5],        %[f7]                       \n\t"
+      "sub.s      %[f5],        %[f5],        %[f7]                       \n\t"
+      "lwc1       %[f11],       8(%[p2_rdft])                             \n\t"
+      "lwc1       %[f12],       12(%[p2_rdft])                            \n\t"
+      "lwc1       %[f13],       8(%[second])                              \n\t"
+      "lwc1       %[f14],       12(%[second])                             \n\t"
+      "add.s      %[f7],        %[f8],        %[f2]                       \n\t"
+      "sub.s      %[f8],        %[f2],        %[f8]                       \n\t"
+      "add.s      %[f2],        %[f6],        %[f3]                       \n\t"
+      "sub.s      %[f6],        %[f3],        %[f6]                       \n\t"
+      "add.s      %[f3],        %[f0],        %[f5]                       \n\t"
+      "sub.s      %[f0],        %[f0],        %[f5]                       \n\t"
+      "add.s      %[f5],        %[f1],        %[f4]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f4]                       \n\t"
+      "swc1       %[f7],        32(%[a_ptr])                              \n\t"
+      "swc1       %[f2],        36(%[a_ptr])                              \n\t"
+      "mul.s      %[f4],        %[f10],       %[f8]                       \n\t"
+#if defined(MIPS32_R2_LE)
+      "mul.s      %[f10],       %[f10],       %[f6]                       \n\t"
+      "mul.s      %[f7],        %[f11],       %[f0]                       \n\t"
+      "mul.s      %[f11],       %[f11],       %[f5]                       \n\t"
+      "mul.s      %[f2],        %[f13],       %[f3]                       \n\t"
+      "mul.s      %[f13],       %[f13],       %[f1]                       \n\t"
+      "madd.s     %[f4],        %[f4],        %[f9],        %[f6]         \n\t"
+      "nmsub.s    %[f10],       %[f10],       %[f9],        %[f8]         \n\t"
+      "nmsub.s    %[f7],        %[f7],        %[f12],       %[f5]         \n\t"
+      "madd.s     %[f11],       %[f11],       %[f12],       %[f0]         \n\t"
+      "nmsub.s    %[f2],        %[f2],        %[f14],       %[f1]         \n\t"
+      "madd.s     %[f13],       %[f13],       %[f14],       %[f3]         \n\t"
+#else
+      "mul.s      %[f2],        %[f9],        %[f6]                       \n\t"
+      "mul.s      %[f10],       %[f10],       %[f6]                       \n\t"
+      "mul.s      %[f9],        %[f9],        %[f8]                       \n\t"
+      "mul.s      %[f7],        %[f11],       %[f0]                       \n\t"
+      "mul.s      %[f8],        %[f12],       %[f5]                       \n\t"
+      "mul.s      %[f11],       %[f11],       %[f5]                       \n\t"
+      "mul.s      %[f12],       %[f12],       %[f0]                       \n\t"
+      "mul.s      %[f5],        %[f13],       %[f3]                       \n\t"
+      "mul.s      %[f0],        %[f14],       %[f1]                       \n\t"
+      "mul.s      %[f13],       %[f13],       %[f1]                       \n\t"
+      "mul.s      %[f14],       %[f14],       %[f3]                       \n\t"
+      "add.s      %[f4],        %[f4],        %[f2]                       \n\t"
+      "sub.s      %[f10],       %[f10],       %[f9]                       \n\t"
+      "sub.s      %[f7],        %[f7],        %[f8]                       \n\t"
+      "add.s      %[f11],       %[f11],       %[f12]                      \n\t"
+      "sub.s      %[f2],        %[f5],        %[f0]                       \n\t"
+      "add.s      %[f13],       %[f13],       %[f14]                      \n\t"
+#endif
+      "swc1       %[f4],        48(%[a_ptr])                              \n\t"
+      "swc1       %[f10],       52(%[a_ptr])                              \n\t"
+      "swc1       %[f7],        40(%[a_ptr])                              \n\t"
+      "swc1       %[f11],       44(%[a_ptr])                              \n\t"
+      "swc1       %[f2],        56(%[a_ptr])                              \n\t"
+      "swc1       %[f13],       60(%[a_ptr])                              \n\t"
+      "addiu      %[count],     %[count],     -1                          \n\t"
+      "lwc1       %[f9],        8(%[p1_rdft])                             \n\t"
+      "addiu      %[a_ptr],     %[a_ptr],     64                          \n\t"
+      "addiu      %[p1_rdft],   %[p1_rdft],   8                           \n\t"
+      "addiu      %[p2_rdft],   %[p2_rdft],   16                          \n\t"
+      "addiu      %[first],     %[first],     8                           \n\t"
+      "bgtz       %[count],     1b                                        \n\t"
+      " addiu     %[second],    %[second],    8                           \n\t"
+      ".set       pop                                                     \n\t"
+      : [f0] "=&f"(f0), [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3),
+        [f4] "=&f"(f4), [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7),
+        [f8] "=&f"(f8), [f9] "=&f"(f9), [f10] "=&f"(f10), [f11] "=&f"(f11),
+        [f12] "=&f"(f12), [f13] "=&f"(f13), [f14] "=&f"(f14),
+        [a_ptr] "=&r"(a_ptr), [p1_rdft] "=&r"(p1_rdft), [first] "+r"(first),
+        [p2_rdft] "=&r"(p2_rdft), [count] "=&r"(count), [second] "+r"(second)
+      : [a] "r"(a), [rdft_w] "r"(rdft_w)
+      : "memory");
+}
+
+void cftmdl_128_mips(float* a) {
+  float f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14;
+  int tmp_a, count;
+  __asm __volatile(
+      ".set       push                                      \n\t"
+      ".set       noreorder                                 \n\t"
+      "addiu      %[tmp_a],   %[a],         0               \n\t"
+      "addiu      %[count],   $zero,        4               \n\t"
+      "1:                                                    \n\t"
+      "addiu      %[count],   %[count],     -1              \n\t"
+      "lwc1       %[f0],      0(%[tmp_a])                   \n\t"
+      "lwc1       %[f2],      32(%[tmp_a])                  \n\t"
+      "lwc1       %[f4],      64(%[tmp_a])                  \n\t"
+      "lwc1       %[f6],      96(%[tmp_a])                  \n\t"
+      "lwc1       %[f1],      4(%[tmp_a])                   \n\t"
+      "lwc1       %[f3],      36(%[tmp_a])                  \n\t"
+      "lwc1       %[f5],      68(%[tmp_a])                  \n\t"
+      "lwc1       %[f7],      100(%[tmp_a])                 \n\t"
+      "add.s      %[f8],      %[f0],        %[f2]           \n\t"
+      "sub.s      %[f0],      %[f0],        %[f2]           \n\t"
+      "add.s      %[f2],      %[f4],        %[f6]           \n\t"
+      "sub.s      %[f4],      %[f4],        %[f6]           \n\t"
+      "add.s      %[f6],      %[f1],        %[f3]           \n\t"
+      "sub.s      %[f1],      %[f1],        %[f3]           \n\t"
+      "add.s      %[f3],      %[f5],        %[f7]           \n\t"
+      "sub.s      %[f5],      %[f5],        %[f7]           \n\t"
+      "add.s      %[f7],      %[f8],        %[f2]           \n\t"
+      "sub.s      %[f8],      %[f8],        %[f2]           \n\t"
+      "add.s      %[f2],      %[f1],        %[f4]           \n\t"
+      "sub.s      %[f1],      %[f1],        %[f4]           \n\t"
+      "add.s      %[f4],      %[f6],        %[f3]           \n\t"
+      "sub.s      %[f6],      %[f6],        %[f3]           \n\t"
+      "sub.s      %[f3],      %[f0],        %[f5]           \n\t"
+      "add.s      %[f0],      %[f0],        %[f5]           \n\t"
+      "swc1       %[f7],      0(%[tmp_a])                   \n\t"
+      "swc1       %[f8],      64(%[tmp_a])                  \n\t"
+      "swc1       %[f2],      36(%[tmp_a])                  \n\t"
+      "swc1       %[f1],      100(%[tmp_a])                 \n\t"
+      "swc1       %[f4],      4(%[tmp_a])                   \n\t"
+      "swc1       %[f6],      68(%[tmp_a])                  \n\t"
+      "swc1       %[f3],      32(%[tmp_a])                  \n\t"
+      "swc1       %[f0],      96(%[tmp_a])                  \n\t"
+      "bgtz       %[count],   1b                            \n\t"
+      " addiu     %[tmp_a],   %[tmp_a],     8               \n\t"
+      ".set       pop                                       \n\t"
+      : [f0] "=&f"(f0), [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3),
+        [f4] "=&f"(f4), [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7),
+        [f8] "=&f"(f8), [tmp_a] "=&r"(tmp_a), [count] "=&r"(count)
+      : [a] "r"(a)
+      : "memory");
+  f9 = rdft_w[2];
+  __asm __volatile(
+      ".set       push                                      \n\t"
+      ".set       noreorder                                 \n\t"
+      "addiu      %[tmp_a],   %[a],         128             \n\t"
+      "addiu      %[count],   $zero,        4               \n\t"
+      "1:                                                    \n\t"
+      "addiu      %[count],   %[count],     -1              \n\t"
+      "lwc1       %[f0],      0(%[tmp_a])                   \n\t"
+      "lwc1       %[f2],      32(%[tmp_a])                  \n\t"
+      "lwc1       %[f5],      68(%[tmp_a])                  \n\t"
+      "lwc1       %[f7],      100(%[tmp_a])                 \n\t"
+      "lwc1       %[f1],      4(%[tmp_a])                   \n\t"
+      "lwc1       %[f3],      36(%[tmp_a])                  \n\t"
+      "lwc1       %[f4],      64(%[tmp_a])                  \n\t"
+      "lwc1       %[f6],      96(%[tmp_a])                  \n\t"
+      "sub.s      %[f8],      %[f0],        %[f2]           \n\t"
+      "add.s      %[f0],      %[f0],        %[f2]           \n\t"
+      "sub.s      %[f2],      %[f5],        %[f7]           \n\t"
+      "add.s      %[f5],      %[f5],        %[f7]           \n\t"
+      "sub.s      %[f7],      %[f1],        %[f3]           \n\t"
+      "add.s      %[f1],      %[f1],        %[f3]           \n\t"
+      "sub.s      %[f3],      %[f4],        %[f6]           \n\t"
+      "add.s      %[f4],      %[f4],        %[f6]           \n\t"
+      "sub.s      %[f6],      %[f8],        %[f2]           \n\t"
+      "add.s      %[f8],      %[f8],        %[f2]           \n\t"
+      "add.s      %[f2],      %[f5],        %[f1]           \n\t"
+      "sub.s      %[f5],      %[f5],        %[f1]           \n\t"
+      "add.s      %[f1],      %[f3],        %[f7]           \n\t"
+      "sub.s      %[f3],      %[f3],        %[f7]           \n\t"
+      "add.s      %[f7],      %[f0],        %[f4]           \n\t"
+      "sub.s      %[f0],      %[f0],        %[f4]           \n\t"
+      "sub.s      %[f4],      %[f6],        %[f1]           \n\t"
+      "add.s      %[f6],      %[f6],        %[f1]           \n\t"
+      "sub.s      %[f1],      %[f3],        %[f8]           \n\t"
+      "add.s      %[f3],      %[f3],        %[f8]           \n\t"
+      "mul.s      %[f4],      %[f4],        %[f9]           \n\t"
+      "mul.s      %[f6],      %[f6],        %[f9]           \n\t"
+      "mul.s      %[f1],      %[f1],        %[f9]           \n\t"
+      "mul.s      %[f3],      %[f3],        %[f9]           \n\t"
+      "swc1       %[f7],      0(%[tmp_a])                   \n\t"
+      "swc1       %[f2],      4(%[tmp_a])                   \n\t"
+      "swc1       %[f5],      64(%[tmp_a])                  \n\t"
+      "swc1       %[f0],      68(%[tmp_a])                  \n\t"
+      "swc1       %[f4],      32(%[tmp_a])                  \n\t"
+      "swc1       %[f6],      36(%[tmp_a])                  \n\t"
+      "swc1       %[f1],      96(%[tmp_a])                  \n\t"
+      "swc1       %[f3],      100(%[tmp_a])                 \n\t"
+      "bgtz       %[count],   1b                            \n\t"
+      " addiu     %[tmp_a],   %[tmp_a],     8               \n\t"
+      ".set       pop                                       \n\t"
+      : [f0] "=&f"(f0), [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3),
+        [f4] "=&f"(f4), [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7),
+        [f8] "=&f"(f8), [tmp_a] "=&r"(tmp_a), [count] "=&r"(count)
+      : [a] "r"(a), [f9] "f"(f9)
+      : "memory");
+  f10 = rdft_w[3];
+  f11 = rdft_w[4];
+  f12 = rdft_w[5];
+  f13 = rdft_wk3ri_first[2];
+  f14 = rdft_wk3ri_first[3];
+
+  __asm __volatile(
+      ".set       push                                                    \n\t"
+      ".set       noreorder                                               \n\t"
+      "addiu      %[tmp_a],     %[a],         256                         \n\t"
+      "addiu      %[count],     $zero,        4                           \n\t"
+      "1:                                                                  \n\t"
+      "addiu      %[count],     %[count],     -1                          \n\t"
+      "lwc1       %[f0],        0(%[tmp_a])                               \n\t"
+      "lwc1       %[f2],        32(%[tmp_a])                              \n\t"
+      "lwc1       %[f4],        64(%[tmp_a])                              \n\t"
+      "lwc1       %[f6],        96(%[tmp_a])                              \n\t"
+      "lwc1       %[f1],        4(%[tmp_a])                               \n\t"
+      "lwc1       %[f3],        36(%[tmp_a])                              \n\t"
+      "lwc1       %[f5],        68(%[tmp_a])                              \n\t"
+      "lwc1       %[f7],        100(%[tmp_a])                             \n\t"
+      "add.s      %[f8],        %[f0],        %[f2]                       \n\t"
+      "sub.s      %[f0],        %[f0],        %[f2]                       \n\t"
+      "add.s      %[f2],        %[f4],        %[f6]                       \n\t"
+      "sub.s      %[f4],        %[f4],        %[f6]                       \n\t"
+      "add.s      %[f6],        %[f1],        %[f3]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f3]                       \n\t"
+      "add.s      %[f3],        %[f5],        %[f7]                       \n\t"
+      "sub.s      %[f5],        %[f5],        %[f7]                       \n\t"
+      "sub.s      %[f7],        %[f8],        %[f2]                       \n\t"
+      "add.s      %[f8],        %[f8],        %[f2]                       \n\t"
+      "add.s      %[f2],        %[f1],        %[f4]                       \n\t"
+      "sub.s      %[f1],        %[f1],        %[f4]                       \n\t"
+      "sub.s      %[f4],        %[f6],        %[f3]                       \n\t"
+      "add.s      %[f6],        %[f6],        %[f3]                       \n\t"
+      "sub.s      %[f3],        %[f0],        %[f5]                       \n\t"
+      "add.s      %[f0],        %[f0],        %[f5]                       \n\t"
+      "swc1       %[f8],        0(%[tmp_a])                               \n\t"
+      "swc1       %[f6],        4(%[tmp_a])                               \n\t"
+      "mul.s      %[f5],        %[f9],        %[f7]                       \n\t"
+#if defined(MIPS32_R2_LE)
+      "mul.s      %[f7],        %[f10],       %[f7]                       \n\t"
+      "mul.s      %[f8],        %[f11],       %[f3]                       \n\t"
+      "mul.s      %[f3],        %[f12],       %[f3]                       \n\t"
+      "mul.s      %[f6],        %[f13],       %[f0]                       \n\t"
+      "mul.s      %[f0],        %[f14],       %[f0]                       \n\t"
+      "nmsub.s    %[f5],        %[f5],        %[f10],       %[f4]         \n\t"
+      "madd.s     %[f7],        %[f7],        %[f9],        %[f4]         \n\t"
+      "nmsub.s    %[f8],        %[f8],        %[f12],       %[f2]         \n\t"
+      "madd.s     %[f3],        %[f3],        %[f11],       %[f2]         \n\t"
+      "nmsub.s    %[f6],        %[f6],        %[f14],       %[f1]         \n\t"
+      "madd.s     %[f0],        %[f0],        %[f13],       %[f1]         \n\t"
+      "swc1       %[f5],        64(%[tmp_a])                              \n\t"
+      "swc1       %[f7],        68(%[tmp_a])                              \n\t"
+#else
+      "mul.s      %[f8],        %[f10],       %[f4]                       \n\t"
+      "mul.s      %[f4],        %[f9],        %[f4]                       \n\t"
+      "mul.s      %[f7],        %[f10],       %[f7]                       \n\t"
+      "mul.s      %[f6],        %[f11],       %[f3]                       \n\t"
+      "mul.s      %[f3],        %[f12],       %[f3]                       \n\t"
+      "sub.s      %[f5],        %[f5],        %[f8]                       \n\t"
+      "mul.s      %[f8],        %[f12],       %[f2]                       \n\t"
+      "mul.s      %[f2],        %[f11],       %[f2]                       \n\t"
+      "add.s      %[f7],        %[f4],        %[f7]                       \n\t"
+      "mul.s      %[f4],        %[f13],       %[f0]                       \n\t"
+      "mul.s      %[f0],        %[f14],       %[f0]                       \n\t"
+      "sub.s      %[f8],        %[f6],        %[f8]                       \n\t"
+      "mul.s      %[f6],        %[f14],       %[f1]                       \n\t"
+      "mul.s      %[f1],        %[f13],       %[f1]                       \n\t"
+      "add.s      %[f3],        %[f2],        %[f3]                       \n\t"
+      "swc1       %[f5],        64(%[tmp_a])                              \n\t"
+      "swc1       %[f7],        68(%[tmp_a])                              \n\t"
+      "sub.s      %[f6],        %[f4],        %[f6]                       \n\t"
+      "add.s      %[f0],        %[f1],        %[f0]                       \n\t"
+#endif
+      "swc1       %[f8],        32(%[tmp_a])                              \n\t"
+      "swc1       %[f3],        36(%[tmp_a])                              \n\t"
+      "swc1       %[f6],        96(%[tmp_a])                              \n\t"
+      "swc1       %[f0],        100(%[tmp_a])                             \n\t"
+      "bgtz       %[count],     1b                                        \n\t"
+      " addiu     %[tmp_a],     %[tmp_a],     8                           \n\t"
+      ".set       pop                                                     \n\t"
+      : [f0] "=&f"(f0), [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3),
+        [f4] "=&f"(f4), [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7),
+        [f8] "=&f"(f8), [tmp_a] "=&r"(tmp_a), [count] "=&r"(count)
+      : [a] "r"(a), [f9] "f"(f9), [f10] "f"(f10), [f11] "f"(f11),
+        [f12] "f"(f12), [f13] "f"(f13), [f14] "f"(f14)
+      : "memory");
+  f11 = rdft_w[6];
+  f12 = rdft_w[7];
+  f13 = rdft_wk3ri_second[2];
+  f14 = rdft_wk3ri_second[3];
+  __asm __volatile(
+      ".set       push                                                       "
+      "\n\t"
+      ".set       noreorder                                                  "
+      "\n\t"
+      "addiu      %[tmp_a],       %[a],           384                        "
+      "\n\t"
+      "addiu      %[count],       $zero,          4                          "
+      "\n\t"
+      "1:                                                                     "
+      "\n\t"
+      "addiu      %[count],       %[count],       -1                         "
+      "\n\t"
+      "lwc1       %[f0],          0(%[tmp_a])                                "
+      "\n\t"
+      "lwc1       %[f1],          4(%[tmp_a])                                "
+      "\n\t"
+      "lwc1       %[f2],          32(%[tmp_a])                               "
+      "\n\t"
+      "lwc1       %[f3],          36(%[tmp_a])                               "
+      "\n\t"
+      "lwc1       %[f4],          64(%[tmp_a])                               "
+      "\n\t"
+      "lwc1       %[f5],          68(%[tmp_a])                               "
+      "\n\t"
+      "lwc1       %[f6],          96(%[tmp_a])                               "
+      "\n\t"
+      "lwc1       %[f7],          100(%[tmp_a])                              "
+      "\n\t"
+      "add.s      %[f8],          %[f0],          %[f2]                      "
+      "\n\t"
+      "sub.s      %[f0],          %[f0],          %[f2]                      "
+      "\n\t"
+      "add.s      %[f2],          %[f4],          %[f6]                      "
+      "\n\t"
+      "sub.s      %[f4],          %[f4],          %[f6]                      "
+      "\n\t"
+      "add.s      %[f6],          %[f1],          %[f3]                      "
+      "\n\t"
+      "sub.s      %[f1],          %[f1],          %[f3]                      "
+      "\n\t"
+      "add.s      %[f3],          %[f5],          %[f7]                      "
+      "\n\t"
+      "sub.s      %[f5],          %[f5],          %[f7]                      "
+      "\n\t"
+      "sub.s      %[f7],          %[f2],          %[f8]                      "
+      "\n\t"
+      "add.s      %[f2],          %[f2],          %[f8]                      "
+      "\n\t"
+      "add.s      %[f8],          %[f1],          %[f4]                      "
+      "\n\t"
+      "sub.s      %[f1],          %[f1],          %[f4]                      "
+      "\n\t"
+      "sub.s      %[f4],          %[f3],          %[f6]                      "
+      "\n\t"
+      "add.s      %[f3],          %[f3],          %[f6]                      "
+      "\n\t"
+      "sub.s      %[f6],          %[f0],          %[f5]                      "
+      "\n\t"
+      "add.s      %[f0],          %[f0],          %[f5]                      "
+      "\n\t"
+      "swc1       %[f2],          0(%[tmp_a])                                "
+      "\n\t"
+      "swc1       %[f3],          4(%[tmp_a])                                "
+      "\n\t"
+      "mul.s      %[f5],          %[f10],         %[f7]                      "
+      "\n\t"
+#if defined(MIPS32_R2_LE)
+      "mul.s      %[f7],          %[f9],          %[f7]                      "
+      "\n\t"
+      "mul.s      %[f2],          %[f12],         %[f8]                      "
+      "\n\t"
+      "mul.s      %[f8],          %[f11],         %[f8]                      "
+      "\n\t"
+      "mul.s      %[f3],          %[f14],         %[f1]                      "
+      "\n\t"
+      "mul.s      %[f1],          %[f13],         %[f1]                      "
+      "\n\t"
+      "madd.s     %[f5],          %[f5],          %[f9],       %[f4]         "
+      "\n\t"
+      "msub.s     %[f7],          %[f7],          %[f10],      %[f4]         "
+      "\n\t"
+      "msub.s     %[f2],          %[f2],          %[f11],      %[f6]         "
+      "\n\t"
+      "madd.s     %[f8],          %[f8],          %[f12],      %[f6]         "
+      "\n\t"
+      "msub.s     %[f3],          %[f3],          %[f13],      %[f0]         "
+      "\n\t"
+      "madd.s     %[f1],          %[f1],          %[f14],      %[f0]         "
+      "\n\t"
+      "swc1       %[f5],          64(%[tmp_a])                               "
+      "\n\t"
+      "swc1       %[f7],          68(%[tmp_a])                               "
+      "\n\t"
+#else
+      "mul.s      %[f2],          %[f9],          %[f4]                      "
+      "\n\t"
+      "mul.s      %[f4],          %[f10],         %[f4]                      "
+      "\n\t"
+      "mul.s      %[f7],          %[f9],          %[f7]                      "
+      "\n\t"
+      "mul.s      %[f3],          %[f11],         %[f6]                      "
+      "\n\t"
+      "mul.s      %[f6],          %[f12],         %[f6]                      "
+      "\n\t"
+      "add.s      %[f5],          %[f5],          %[f2]                      "
+      "\n\t"
+      "sub.s      %[f7],          %[f4],          %[f7]                      "
+      "\n\t"
+      "mul.s      %[f2],          %[f12],         %[f8]                      "
+      "\n\t"
+      "mul.s      %[f8],          %[f11],         %[f8]                      "
+      "\n\t"
+      "mul.s      %[f4],          %[f14],         %[f1]                      "
+      "\n\t"
+      "mul.s      %[f1],          %[f13],         %[f1]                      "
+      "\n\t"
+      "sub.s      %[f2],          %[f3],          %[f2]                      "
+      "\n\t"
+      "mul.s      %[f3],          %[f13],         %[f0]                      "
+      "\n\t"
+      "mul.s      %[f0],          %[f14],         %[f0]                      "
+      "\n\t"
+      "add.s      %[f8],          %[f8],          %[f6]                      "
+      "\n\t"
+      "swc1       %[f5],          64(%[tmp_a])                               "
+      "\n\t"
+      "swc1       %[f7],          68(%[tmp_a])                               "
+      "\n\t"
+      "sub.s      %[f3],          %[f3],          %[f4]                      "
+      "\n\t"
+      "add.s      %[f1],          %[f1],          %[f0]                      "
+      "\n\t"
+#endif
+      "swc1       %[f2],          32(%[tmp_a])                               "
+      "\n\t"
+      "swc1       %[f8],          36(%[tmp_a])                               "
+      "\n\t"
+      "swc1       %[f3],          96(%[tmp_a])                               "
+      "\n\t"
+      "swc1       %[f1],          100(%[tmp_a])                              "
+      "\n\t"
+      "bgtz       %[count],       1b                                         "
+      "\n\t"
+      " addiu     %[tmp_a],       %[tmp_a],       8                          "
+      "\n\t"
+      ".set       pop                                                        "
+      "\n\t"
+      : [f0] "=&f"(f0), [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3),
+        [f4] "=&f"(f4), [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7),
+        [f8] "=&f"(f8), [tmp_a] "=&r"(tmp_a), [count] "=&r"(count)
+      : [a] "r"(a), [f9] "f"(f9), [f10] "f"(f10), [f11] "f"(f11),
+        [f12] "f"(f12), [f13] "f"(f13), [f14] "f"(f14)
+      : "memory");
+}
+
+void cftfsub_128_mips(float* a) {
+  float f0, f1, f2, f3, f4, f5, f6, f7, f8;
+  int tmp_a, count;
+
+  cft1st_128_mips(a);
+  cftmdl_128_mips(a);
+
+  __asm __volatile(
+      ".set       push                                      \n\t"
+      ".set       noreorder                                 \n\t"
+      "addiu      %[tmp_a],       %[a],         0           \n\t"
+      "addiu      %[count],       $zero,        16          \n\t"
+      "1:                                                    \n\t"
+      "addiu      %[count],       %[count],     -1          \n\t"
+      "lwc1       %[f0],          0(%[tmp_a])               \n\t"
+      "lwc1       %[f2],          128(%[tmp_a])             \n\t"
+      "lwc1       %[f4],          256(%[tmp_a])             \n\t"
+      "lwc1       %[f6],          384(%[tmp_a])             \n\t"
+      "lwc1       %[f1],          4(%[tmp_a])               \n\t"
+      "lwc1       %[f3],          132(%[tmp_a])             \n\t"
+      "lwc1       %[f5],          260(%[tmp_a])             \n\t"
+      "lwc1       %[f7],          388(%[tmp_a])             \n\t"
+      "add.s      %[f8],          %[f0],        %[f2]       \n\t"
+      "sub.s      %[f0],          %[f0],        %[f2]       \n\t"
+      "add.s      %[f2],          %[f4],        %[f6]       \n\t"
+      "sub.s      %[f4],          %[f4],        %[f6]       \n\t"
+      "add.s      %[f6],          %[f1],        %[f3]       \n\t"
+      "sub.s      %[f1],          %[f1],        %[f3]       \n\t"
+      "add.s      %[f3],          %[f5],        %[f7]       \n\t"
+      "sub.s      %[f5],          %[f5],        %[f7]       \n\t"
+      "add.s      %[f7],          %[f8],        %[f2]       \n\t"
+      "sub.s      %[f8],          %[f8],        %[f2]       \n\t"
+      "add.s      %[f2],          %[f1],        %[f4]       \n\t"
+      "sub.s      %[f1],          %[f1],        %[f4]       \n\t"
+      "add.s      %[f4],          %[f6],        %[f3]       \n\t"
+      "sub.s      %[f6],          %[f6],        %[f3]       \n\t"
+      "sub.s      %[f3],          %[f0],        %[f5]       \n\t"
+      "add.s      %[f0],          %[f0],        %[f5]       \n\t"
+      "swc1       %[f7],          0(%[tmp_a])               \n\t"
+      "swc1       %[f8],          256(%[tmp_a])             \n\t"
+      "swc1       %[f2],          132(%[tmp_a])             \n\t"
+      "swc1       %[f1],          388(%[tmp_a])             \n\t"
+      "swc1       %[f4],          4(%[tmp_a])               \n\t"
+      "swc1       %[f6],          260(%[tmp_a])             \n\t"
+      "swc1       %[f3],          128(%[tmp_a])             \n\t"
+      "swc1       %[f0],          384(%[tmp_a])             \n\t"
+      "bgtz       %[count],       1b                        \n\t"
+      " addiu     %[tmp_a],       %[tmp_a],   8             \n\t"
+      ".set       pop                                       \n\t"
+      : [f0] "=&f"(f0), [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3),
+        [f4] "=&f"(f4), [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7),
+        [f8] "=&f"(f8), [tmp_a] "=&r"(tmp_a), [count] "=&r"(count)
+      : [a] "r"(a)
+      : "memory");
+}
+
+void cftbsub_128_mips(float* a) {
+  float f0, f1, f2, f3, f4, f5, f6, f7, f8;
+  int tmp_a, count;
+
+  cft1st_128_mips(a);
+  cftmdl_128_mips(a);
+
+  __asm __volatile(
+      ".set       push                                        \n\t"
+      ".set       noreorder                                   \n\t"
+      "addiu      %[tmp_a],   %[a],           0               \n\t"
+      "addiu      %[count],   $zero,          16              \n\t"
+      "1:                                                      \n\t"
+      "addiu      %[count],   %[count],       -1              \n\t"
+      "lwc1       %[f0],      0(%[tmp_a])                     \n\t"
+      "lwc1       %[f2],      128(%[tmp_a])                   \n\t"
+      "lwc1       %[f4],      256(%[tmp_a])                   \n\t"
+      "lwc1       %[f6],      384(%[tmp_a])                   \n\t"
+      "lwc1       %[f1],      4(%[tmp_a])                     \n\t"
+      "lwc1       %[f3],      132(%[tmp_a])                   \n\t"
+      "lwc1       %[f5],      260(%[tmp_a])                   \n\t"
+      "lwc1       %[f7],      388(%[tmp_a])                   \n\t"
+      "add.s      %[f8],      %[f0],          %[f2]           \n\t"
+      "sub.s      %[f0],      %[f0],          %[f2]           \n\t"
+      "add.s      %[f2],      %[f4],          %[f6]           \n\t"
+      "sub.s      %[f4],      %[f4],          %[f6]           \n\t"
+      "add.s      %[f6],      %[f1],          %[f3]           \n\t"
+      "sub.s      %[f1],      %[f3],          %[f1]           \n\t"
+      "add.s      %[f3],      %[f5],          %[f7]           \n\t"
+      "sub.s      %[f5],      %[f5],          %[f7]           \n\t"
+      "add.s      %[f7],      %[f8],          %[f2]           \n\t"
+      "sub.s      %[f8],      %[f8],          %[f2]           \n\t"
+      "sub.s      %[f2],      %[f1],          %[f4]           \n\t"
+      "add.s      %[f1],      %[f1],          %[f4]           \n\t"
+      "add.s      %[f4],      %[f3],          %[f6]           \n\t"
+      "sub.s      %[f6],      %[f3],          %[f6]           \n\t"
+      "sub.s      %[f3],      %[f0],          %[f5]           \n\t"
+      "add.s      %[f0],      %[f0],          %[f5]           \n\t"
+      "neg.s      %[f4],      %[f4]                           \n\t"
+      "swc1       %[f7],      0(%[tmp_a])                     \n\t"
+      "swc1       %[f8],      256(%[tmp_a])                   \n\t"
+      "swc1       %[f2],      132(%[tmp_a])                   \n\t"
+      "swc1       %[f1],      388(%[tmp_a])                   \n\t"
+      "swc1       %[f6],      260(%[tmp_a])                   \n\t"
+      "swc1       %[f3],      128(%[tmp_a])                   \n\t"
+      "swc1       %[f0],      384(%[tmp_a])                   \n\t"
+      "swc1       %[f4],       4(%[tmp_a])                     \n\t"
+      "bgtz       %[count],   1b                              \n\t"
+      " addiu     %[tmp_a],   %[tmp_a],       8               \n\t"
+      ".set       pop                                         \n\t"
+      : [f0] "=&f"(f0), [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3),
+        [f4] "=&f"(f4), [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7),
+        [f8] "=&f"(f8), [tmp_a] "=&r"(tmp_a), [count] "=&r"(count)
+      : [a] "r"(a)
+      : "memory");
+}
+
+void rftfsub_128_mips(float* a) {
+  const float* c = rdft_w + 32;
+  const float f0 = 0.5f;
+  float* a1 = &a[2];
+  float* a2 = &a[126];
+  const float* c1 = &c[1];
+  const float* c2 = &c[31];
+  float f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14, f15;
+  int count;
+
+  __asm __volatile(
+      ".set      push                                             \n\t"
+      ".set      noreorder                                        \n\t"
+      "lwc1      %[f6],       0(%[c2])                            \n\t"
+      "lwc1      %[f1],       0(%[a1])                            \n\t"
+      "lwc1      %[f2],       0(%[a2])                            \n\t"
+      "lwc1      %[f3],       4(%[a1])                            \n\t"
+      "lwc1      %[f4],       4(%[a2])                            \n\t"
+      "lwc1      %[f5],       0(%[c1])                            \n\t"
+      "sub.s     %[f6],       %[f0],        %[f6]                 \n\t"
+      "sub.s     %[f7],       %[f1],        %[f2]                 \n\t"
+      "add.s     %[f8],       %[f3],        %[f4]                 \n\t"
+      "addiu     %[count],    $zero,        15                    \n\t"
+      "mul.s     %[f9],       %[f6],        %[f7]                 \n\t"
+      "mul.s     %[f6],       %[f6],        %[f8]                 \n\t"
+#if !defined(MIPS32_R2_LE)
+      "mul.s     %[f8],       %[f5],        %[f8]                 \n\t"
+      "mul.s     %[f5],       %[f5],        %[f7]                 \n\t"
+      "sub.s     %[f9],       %[f9],        %[f8]                 \n\t"
+      "add.s     %[f6],       %[f6],        %[f5]                 \n\t"
+#else
+      "nmsub.s   %[f9],       %[f9],        %[f5],      %[f8]     \n\t"
+      "madd.s    %[f6],       %[f6],        %[f5],      %[f7]     \n\t"
+#endif
+      "sub.s     %[f1],       %[f1],        %[f9]                 \n\t"
+      "add.s     %[f2],       %[f2],        %[f9]                 \n\t"
+      "sub.s     %[f3],       %[f3],        %[f6]                 \n\t"
+      "sub.s     %[f4],       %[f4],        %[f6]                 \n\t"
+      "swc1      %[f1],       0(%[a1])                            \n\t"
+      "swc1      %[f2],       0(%[a2])                            \n\t"
+      "swc1      %[f3],       4(%[a1])                            \n\t"
+      "swc1      %[f4],       4(%[a2])                            \n\t"
+      "addiu     %[a1],       %[a1],        8                     \n\t"
+      "addiu     %[a2],       %[a2],        -8                    \n\t"
+      "addiu     %[c1],       %[c1],        4                     \n\t"
+      "addiu     %[c2],       %[c2],        -4                    \n\t"
+      "1:                                                          \n\t"
+      "lwc1      %[f6],       0(%[c2])                            \n\t"
+      "lwc1      %[f1],       0(%[a1])                            \n\t"
+      "lwc1      %[f2],       0(%[a2])                            \n\t"
+      "lwc1      %[f3],       4(%[a1])                            \n\t"
+      "lwc1      %[f4],       4(%[a2])                            \n\t"
+      "lwc1      %[f5],       0(%[c1])                            \n\t"
+      "sub.s     %[f6],       %[f0],        %[f6]                 \n\t"
+      "sub.s     %[f7],       %[f1],        %[f2]                 \n\t"
+      "add.s     %[f8],       %[f3],        %[f4]                 \n\t"
+      "lwc1      %[f10],      -4(%[c2])                           \n\t"
+      "lwc1      %[f11],      8(%[a1])                            \n\t"
+      "lwc1      %[f12],      -8(%[a2])                           \n\t"
+      "mul.s     %[f9],       %[f6],        %[f7]                 \n\t"
+      "mul.s     %[f6],       %[f6],        %[f8]                 \n\t"
+#if !defined(MIPS32_R2_LE)
+      "mul.s     %[f8],       %[f5],        %[f8]                 \n\t"
+      "mul.s     %[f5],       %[f5],        %[f7]                 \n\t"
+      "lwc1      %[f13],      12(%[a1])                           \n\t"
+      "lwc1      %[f14],      -4(%[a2])                           \n\t"
+      "lwc1      %[f15],      4(%[c1])                            \n\t"
+      "sub.s     %[f9],       %[f9],        %[f8]                 \n\t"
+      "add.s     %[f6],       %[f6],        %[f5]                 \n\t"
+#else
+      "lwc1      %[f13],      12(%[a1])                           \n\t"
+      "lwc1      %[f14],      -4(%[a2])                           \n\t"
+      "lwc1      %[f15],      4(%[c1])                            \n\t"
+      "nmsub.s   %[f9],       %[f9],        %[f5],      %[f8]     \n\t"
+      "madd.s    %[f6],       %[f6],        %[f5],      %[f7]     \n\t"
+#endif
+      "sub.s     %[f10],      %[f0],        %[f10]                \n\t"
+      "sub.s     %[f5],       %[f11],       %[f12]                \n\t"
+      "add.s     %[f7],       %[f13],       %[f14]                \n\t"
+      "sub.s     %[f1],       %[f1],        %[f9]                 \n\t"
+      "add.s     %[f2],       %[f2],        %[f9]                 \n\t"
+      "sub.s     %[f3],       %[f3],        %[f6]                 \n\t"
+      "mul.s     %[f8],       %[f10],       %[f5]                 \n\t"
+      "mul.s     %[f10],      %[f10],       %[f7]                 \n\t"
+#if !defined(MIPS32_R2_LE)
+      "mul.s     %[f9],       %[f15],       %[f7]                 \n\t"
+      "mul.s     %[f15],      %[f15],       %[f5]                 \n\t"
+      "sub.s     %[f4],       %[f4],        %[f6]                 \n\t"
+      "swc1      %[f1],       0(%[a1])                            \n\t"
+      "swc1      %[f2],       0(%[a2])                            \n\t"
+      "sub.s     %[f8],       %[f8],        %[f9]                 \n\t"
+      "add.s     %[f10],      %[f10],       %[f15]                \n\t"
+#else
+      "swc1      %[f1],       0(%[a1])                            \n\t"
+      "swc1      %[f2],       0(%[a2])                            \n\t"
+      "sub.s     %[f4],       %[f4],        %[f6]                 \n\t"
+      "nmsub.s   %[f8],       %[f8],        %[f15],     %[f7]     \n\t"
+      "madd.s    %[f10],      %[f10],       %[f15],     %[f5]     \n\t"
+#endif
+      "swc1      %[f3],       4(%[a1])                            \n\t"
+      "swc1      %[f4],       4(%[a2])                            \n\t"
+      "sub.s     %[f11],      %[f11],       %[f8]                 \n\t"
+      "add.s     %[f12],      %[f12],       %[f8]                 \n\t"
+      "sub.s     %[f13],      %[f13],       %[f10]                \n\t"
+      "sub.s     %[f14],      %[f14],       %[f10]                \n\t"
+      "addiu     %[c2],       %[c2],        -8                    \n\t"
+      "addiu     %[c1],       %[c1],        8                     \n\t"
+      "swc1      %[f11],      8(%[a1])                            \n\t"
+      "swc1      %[f12],      -8(%[a2])                           \n\t"
+      "swc1      %[f13],      12(%[a1])                           \n\t"
+      "swc1      %[f14],      -4(%[a2])                           \n\t"
+      "addiu     %[a1],       %[a1],        16                    \n\t"
+      "addiu     %[count],    %[count],     -1                    \n\t"
+      "bgtz      %[count],    1b                                  \n\t"
+      " addiu    %[a2],       %[a2],        -16                   \n\t"
+      ".set      pop                                              \n\t"
+      : [a1] "+r"(a1), [a2] "+r"(a2), [c1] "+r"(c1), [c2] "+r"(c2),
+        [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3), [f4] "=&f"(f4),
+        [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7), [f8] "=&f"(f8),
+        [f9] "=&f"(f9), [f10] "=&f"(f10), [f11] "=&f"(f11), [f12] "=&f"(f12),
+        [f13] "=&f"(f13), [f14] "=&f"(f14), [f15] "=&f"(f15),
+        [count] "=&r"(count)
+      : [f0] "f"(f0)
+      : "memory");
+}
+
+void rftbsub_128_mips(float* a) {
+  const float* c = rdft_w + 32;
+  const float f0 = 0.5f;
+  float* a1 = &a[2];
+  float* a2 = &a[126];
+  const float* c1 = &c[1];
+  const float* c2 = &c[31];
+  float f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13, f14, f15;
+  int count;
+
+  a[1] = -a[1];
+  a[65] = -a[65];
+
+  __asm __volatile(
+      ".set      push                                             \n\t"
+      ".set      noreorder                                        \n\t"
+      "lwc1      %[f6],       0(%[c2])                            \n\t"
+      "lwc1      %[f1],       0(%[a1])                            \n\t"
+      "lwc1      %[f2],       0(%[a2])                            \n\t"
+      "lwc1      %[f3],       4(%[a1])                            \n\t"
+      "lwc1      %[f4],       4(%[a2])                            \n\t"
+      "lwc1      %[f5],       0(%[c1])                            \n\t"
+      "sub.s     %[f6],       %[f0],        %[f6]                 \n\t"
+      "sub.s     %[f7],       %[f1],        %[f2]                 \n\t"
+      "add.s     %[f8],       %[f3],        %[f4]                 \n\t"
+      "addiu     %[count],    $zero,        15                    \n\t"
+      "mul.s     %[f9],       %[f6],        %[f7]                 \n\t"
+      "mul.s     %[f6],       %[f6],        %[f8]                 \n\t"
+#if !defined(MIPS32_R2_LE)
+      "mul.s     %[f8],       %[f5],        %[f8]                 \n\t"
+      "mul.s     %[f5],       %[f5],        %[f7]                 \n\t"
+      "add.s     %[f9],       %[f9],        %[f8]                 \n\t"
+      "sub.s     %[f6],       %[f6],        %[f5]                 \n\t"
+#else
+      "madd.s    %[f9],       %[f9],        %[f5],      %[f8]     \n\t"
+      "nmsub.s   %[f6],       %[f6],        %[f5],      %[f7]     \n\t"
+#endif
+      "sub.s     %[f1],       %[f1],        %[f9]                 \n\t"
+      "add.s     %[f2],       %[f2],        %[f9]                 \n\t"
+      "sub.s     %[f3],       %[f6],        %[f3]                 \n\t"
+      "sub.s     %[f4],       %[f6],        %[f4]                 \n\t"
+      "swc1      %[f1],       0(%[a1])                            \n\t"
+      "swc1      %[f2],       0(%[a2])                            \n\t"
+      "swc1      %[f3],       4(%[a1])                            \n\t"
+      "swc1      %[f4],       4(%[a2])                            \n\t"
+      "addiu     %[a1],       %[a1],        8                     \n\t"
+      "addiu     %[a2],       %[a2],        -8                    \n\t"
+      "addiu     %[c1],       %[c1],        4                     \n\t"
+      "addiu     %[c2],       %[c2],        -4                    \n\t"
+      "1:                                                          \n\t"
+      "lwc1      %[f6],       0(%[c2])                            \n\t"
+      "lwc1      %[f1],       0(%[a1])                            \n\t"
+      "lwc1      %[f2],       0(%[a2])                            \n\t"
+      "lwc1      %[f3],       4(%[a1])                            \n\t"
+      "lwc1      %[f4],       4(%[a2])                            \n\t"
+      "lwc1      %[f5],       0(%[c1])                            \n\t"
+      "sub.s     %[f6],       %[f0],        %[f6]                 \n\t"
+      "sub.s     %[f7],       %[f1],        %[f2]                 \n\t"
+      "add.s     %[f8],       %[f3],        %[f4]                 \n\t"
+      "lwc1      %[f10],      -4(%[c2])                           \n\t"
+      "lwc1      %[f11],      8(%[a1])                            \n\t"
+      "lwc1      %[f12],      -8(%[a2])                           \n\t"
+      "mul.s     %[f9],       %[f6],        %[f7]                 \n\t"
+      "mul.s     %[f6],       %[f6],        %[f8]                 \n\t"
+#if !defined(MIPS32_R2_LE)
+      "mul.s     %[f8],       %[f5],        %[f8]                 \n\t"
+      "mul.s     %[f5],       %[f5],        %[f7]                 \n\t"
+      "lwc1      %[f13],      12(%[a1])                           \n\t"
+      "lwc1      %[f14],      -4(%[a2])                           \n\t"
+      "lwc1      %[f15],      4(%[c1])                            \n\t"
+      "add.s     %[f9],       %[f9],        %[f8]                 \n\t"
+      "sub.s     %[f6],       %[f6],        %[f5]                 \n\t"
+#else
+      "lwc1      %[f13],      12(%[a1])                           \n\t"
+      "lwc1      %[f14],      -4(%[a2])                           \n\t"
+      "lwc1      %[f15],      4(%[c1])                            \n\t"
+      "madd.s    %[f9],       %[f9],        %[f5],      %[f8]     \n\t"
+      "nmsub.s   %[f6],       %[f6],        %[f5],      %[f7]     \n\t"
+#endif
+      "sub.s     %[f10],      %[f0],        %[f10]                \n\t"
+      "sub.s     %[f5],       %[f11],       %[f12]                \n\t"
+      "add.s     %[f7],       %[f13],       %[f14]                \n\t"
+      "sub.s     %[f1],       %[f1],        %[f9]                 \n\t"
+      "add.s     %[f2],       %[f2],        %[f9]                 \n\t"
+      "sub.s     %[f3],       %[f6],        %[f3]                 \n\t"
+      "mul.s     %[f8],       %[f10],       %[f5]                 \n\t"
+      "mul.s     %[f10],      %[f10],       %[f7]                 \n\t"
+#if !defined(MIPS32_R2_LE)
+      "mul.s     %[f9],       %[f15],       %[f7]                 \n\t"
+      "mul.s     %[f15],      %[f15],       %[f5]                 \n\t"
+      "sub.s     %[f4],       %[f6],        %[f4]                 \n\t"
+      "swc1      %[f1],       0(%[a1])                            \n\t"
+      "swc1      %[f2],       0(%[a2])                            \n\t"
+      "add.s     %[f8],       %[f8],        %[f9]                 \n\t"
+      "sub.s     %[f10],      %[f10],       %[f15]                \n\t"
+#else
+      "swc1      %[f1],       0(%[a1])                            \n\t"
+      "swc1      %[f2],       0(%[a2])                            \n\t"
+      "sub.s     %[f4],       %[f6],        %[f4]                 \n\t"
+      "madd.s    %[f8],       %[f8],        %[f15],     %[f7]     \n\t"
+      "nmsub.s   %[f10],      %[f10],       %[f15],     %[f5]     \n\t"
+#endif
+      "swc1      %[f3],       4(%[a1])                            \n\t"
+      "swc1      %[f4],       4(%[a2])                            \n\t"
+      "sub.s     %[f11],      %[f11],       %[f8]                 \n\t"
+      "add.s     %[f12],      %[f12],       %[f8]                 \n\t"
+      "sub.s     %[f13],      %[f10],       %[f13]                \n\t"
+      "sub.s     %[f14],      %[f10],       %[f14]                \n\t"
+      "addiu     %[c2],       %[c2],        -8                    \n\t"
+      "addiu     %[c1],       %[c1],        8                     \n\t"
+      "swc1      %[f11],      8(%[a1])                            \n\t"
+      "swc1      %[f12],      -8(%[a2])                           \n\t"
+      "swc1      %[f13],      12(%[a1])                           \n\t"
+      "swc1      %[f14],      -4(%[a2])                           \n\t"
+      "addiu     %[a1],       %[a1],        16                    \n\t"
+      "addiu     %[count],    %[count],     -1                    \n\t"
+      "bgtz      %[count],    1b                                  \n\t"
+      " addiu    %[a2],       %[a2],        -16                   \n\t"
+      ".set      pop                                              \n\t"
+      : [a1] "+r"(a1), [a2] "+r"(a2), [c1] "+r"(c1), [c2] "+r"(c2),
+        [f1] "=&f"(f1), [f2] "=&f"(f2), [f3] "=&f"(f3), [f4] "=&f"(f4),
+        [f5] "=&f"(f5), [f6] "=&f"(f6), [f7] "=&f"(f7), [f8] "=&f"(f8),
+        [f9] "=&f"(f9), [f10] "=&f"(f10), [f11] "=&f"(f11), [f12] "=&f"(f12),
+        [f13] "=&f"(f13), [f14] "=&f"(f14), [f15] "=&f"(f15),
+        [count] "=&r"(count)
+      : [f0] "f"(f0)
+      : "memory");
+}
+#endif
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.cc b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.cc
new file mode 100644
index 0000000000..acab9722dc
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.cc
@@ -0,0 +1,351 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * The rdft AEC algorithm, neon version of speed-critical functions.
+ *
+ * Based on the sse2 version.
+ */
+
+#include <arm_neon.h>
+
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft.h"
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_common.h"
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_neon_sse2.h"
+
+namespace webrtc {
+
+#if defined(WEBRTC_HAS_NEON)
+void cft1st_128_neon(float* a) {
+  const float32x4_t vec_swap_sign = vld1q_f32((float32_t*)k_swap_sign);
+  int j, k2;
+
+  for (k2 = 0, j = 0; j < 128; j += 16, k2 += 4) {
+    float32x4_t a00v = vld1q_f32(&a[j + 0]);
+    float32x4_t a04v = vld1q_f32(&a[j + 4]);
+    float32x4_t a08v = vld1q_f32(&a[j + 8]);
+    float32x4_t a12v = vld1q_f32(&a[j + 12]);
+    float32x4_t a01v = vcombine_f32(vget_low_f32(a00v), vget_low_f32(a08v));
+    float32x4_t a23v = vcombine_f32(vget_high_f32(a00v), vget_high_f32(a08v));
+    float32x4_t a45v = vcombine_f32(vget_low_f32(a04v), vget_low_f32(a12v));
+    float32x4_t a67v = vcombine_f32(vget_high_f32(a04v), vget_high_f32(a12v));
+    const float32x4_t wk1rv = vld1q_f32(&rdft_wk1r[k2]);
+    const float32x4_t wk1iv = vld1q_f32(&rdft_wk1i[k2]);
+    const float32x4_t wk2rv = vld1q_f32(&rdft_wk2r[k2]);
+    const float32x4_t wk2iv = vld1q_f32(&rdft_wk2i[k2]);
+    const float32x4_t wk3rv = vld1q_f32(&rdft_wk3r[k2]);
+    const float32x4_t wk3iv = vld1q_f32(&rdft_wk3i[k2]);
+    float32x4_t x0v = vaddq_f32(a01v, a23v);
+    const float32x4_t x1v = vsubq_f32(a01v, a23v);
+    const float32x4_t x2v = vaddq_f32(a45v, a67v);
+    const float32x4_t x3v = vsubq_f32(a45v, a67v);
+    const float32x4_t x3w = vrev64q_f32(x3v);
+    float32x4_t x0w;
+    a01v = vaddq_f32(x0v, x2v);
+    x0v = vsubq_f32(x0v, x2v);
+    x0w = vrev64q_f32(x0v);
+    a45v = vmulq_f32(wk2rv, x0v);
+    a45v = vmlaq_f32(a45v, wk2iv, x0w);
+    x0v = vmlaq_f32(x1v, x3w, vec_swap_sign);
+    x0w = vrev64q_f32(x0v);
+    a23v = vmulq_f32(wk1rv, x0v);
+    a23v = vmlaq_f32(a23v, wk1iv, x0w);
+    x0v = vmlsq_f32(x1v, x3w, vec_swap_sign);
+    x0w = vrev64q_f32(x0v);
+    a67v = vmulq_f32(wk3rv, x0v);
+    a67v = vmlaq_f32(a67v, wk3iv, x0w);
+    a00v = vcombine_f32(vget_low_f32(a01v), vget_low_f32(a23v));
+    a04v = vcombine_f32(vget_low_f32(a45v), vget_low_f32(a67v));
+    a08v = vcombine_f32(vget_high_f32(a01v), vget_high_f32(a23v));
+    a12v = vcombine_f32(vget_high_f32(a45v), vget_high_f32(a67v));
+    vst1q_f32(&a[j + 0], a00v);
+    vst1q_f32(&a[j + 4], a04v);
+    vst1q_f32(&a[j + 8], a08v);
+    vst1q_f32(&a[j + 12], a12v);
+  }
+}
+
+void cftmdl_128_neon(float* a) {
+  int j;
+  const int l = 8;
+  const float32x4_t vec_swap_sign = vld1q_f32((float32_t*)k_swap_sign);
+  float32x4_t wk1rv = vld1q_f32(cftmdl_wk1r);
+
+  for (j = 0; j < l; j += 2) {
+    const float32x2_t a_00 = vld1_f32(&a[j + 0]);
+    const float32x2_t a_08 = vld1_f32(&a[j + 8]);
+    const float32x2_t a_32 = vld1_f32(&a[j + 32]);
+    const float32x2_t a_40 = vld1_f32(&a[j + 40]);
+    const float32x4_t a_00_32 = vcombine_f32(a_00, a_32);
+    const float32x4_t a_08_40 = vcombine_f32(a_08, a_40);
+    const float32x4_t x0r0_0i0_0r1_x0i1 = vaddq_f32(a_00_32, a_08_40);
+    const float32x4_t x1r0_1i0_1r1_x1i1 = vsubq_f32(a_00_32, a_08_40);
+    const float32x2_t a_16 = vld1_f32(&a[j + 16]);
+    const float32x2_t a_24 = vld1_f32(&a[j + 24]);
+    const float32x2_t a_48 = vld1_f32(&a[j + 48]);
+    const float32x2_t a_56 = vld1_f32(&a[j + 56]);
+    const float32x4_t a_16_48 = vcombine_f32(a_16, a_48);
+    const float32x4_t a_24_56 = vcombine_f32(a_24, a_56);
+    const float32x4_t x2r0_2i0_2r1_x2i1 = vaddq_f32(a_16_48, a_24_56);
+    const float32x4_t x3r0_3i0_3r1_x3i1 = vsubq_f32(a_16_48, a_24_56);
+    const float32x4_t xx0 = vaddq_f32(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+    const float32x4_t xx1 = vsubq_f32(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+    const float32x4_t x3i0_3r0_3i1_x3r1 = vrev64q_f32(x3r0_3i0_3r1_x3i1);
+    const float32x4_t x1_x3_add =
+        vmlaq_f32(x1r0_1i0_1r1_x1i1, vec_swap_sign, x3i0_3r0_3i1_x3r1);
+    const float32x4_t x1_x3_sub =
+        vmlsq_f32(x1r0_1i0_1r1_x1i1, vec_swap_sign, x3i0_3r0_3i1_x3r1);
+    const float32x2_t yy0_a = vdup_lane_f32(vget_high_f32(x1_x3_add), 0);
+    const float32x2_t yy0_s = vdup_lane_f32(vget_high_f32(x1_x3_sub), 0);
+    const float32x4_t yy0_as = vcombine_f32(yy0_a, yy0_s);
+    const float32x2_t yy1_a = vdup_lane_f32(vget_high_f32(x1_x3_add), 1);
+    const float32x2_t yy1_s = vdup_lane_f32(vget_high_f32(x1_x3_sub), 1);
+    const float32x4_t yy1_as = vcombine_f32(yy1_a, yy1_s);
+    const float32x4_t yy0 = vmlaq_f32(yy0_as, vec_swap_sign, yy1_as);
+    const float32x4_t yy4 = vmulq_f32(wk1rv, yy0);
+    const float32x4_t xx1_rev = vrev64q_f32(xx1);
+    const float32x4_t yy4_rev = vrev64q_f32(yy4);
+
+    vst1_f32(&a[j + 0], vget_low_f32(xx0));
+    vst1_f32(&a[j + 32], vget_high_f32(xx0));
+    vst1_f32(&a[j + 16], vget_low_f32(xx1));
+    vst1_f32(&a[j + 48], vget_high_f32(xx1_rev));
+
+    a[j + 48] = -a[j + 48];
+
+    vst1_f32(&a[j + 8], vget_low_f32(x1_x3_add));
+    vst1_f32(&a[j + 24], vget_low_f32(x1_x3_sub));
+    vst1_f32(&a[j + 40], vget_low_f32(yy4));
+    vst1_f32(&a[j + 56], vget_high_f32(yy4_rev));
+  }
+
+  {
+    const int k = 64;
+    const int k1 = 2;
+    const int k2 = 2 * k1;
+    const float32x4_t wk2rv = vld1q_f32(&rdft_wk2r[k2 + 0]);
+    const float32x4_t wk2iv = vld1q_f32(&rdft_wk2i[k2 + 0]);
+    const float32x4_t wk1iv = vld1q_f32(&rdft_wk1i[k2 + 0]);
+    const float32x4_t wk3rv = vld1q_f32(&rdft_wk3r[k2 + 0]);
+    const float32x4_t wk3iv = vld1q_f32(&rdft_wk3i[k2 + 0]);
+    wk1rv = vld1q_f32(&rdft_wk1r[k2 + 0]);
+    for (j = k; j < l + k; j += 2) {
+      const float32x2_t a_00 = vld1_f32(&a[j + 0]);
+      const float32x2_t a_08 = vld1_f32(&a[j + 8]);
+      const float32x2_t a_32 = vld1_f32(&a[j + 32]);
+      const float32x2_t a_40 = vld1_f32(&a[j + 40]);
+      const float32x4_t a_00_32 = vcombine_f32(a_00, a_32);
+      const float32x4_t a_08_40 = vcombine_f32(a_08, a_40);
+      const float32x4_t x0r0_0i0_0r1_x0i1 = vaddq_f32(a_00_32, a_08_40);
+      const float32x4_t x1r0_1i0_1r1_x1i1 = vsubq_f32(a_00_32, a_08_40);
+      const float32x2_t a_16 = vld1_f32(&a[j + 16]);
+      const float32x2_t a_24 = vld1_f32(&a[j + 24]);
+      const float32x2_t a_48 = vld1_f32(&a[j + 48]);
+      const float32x2_t a_56 = vld1_f32(&a[j + 56]);
+      const float32x4_t a_16_48 = vcombine_f32(a_16, a_48);
+      const float32x4_t a_24_56 = vcombine_f32(a_24, a_56);
+      const float32x4_t x2r0_2i0_2r1_x2i1 = vaddq_f32(a_16_48, a_24_56);
+      const float32x4_t x3r0_3i0_3r1_x3i1 = vsubq_f32(a_16_48, a_24_56);
+      const float32x4_t xx = vaddq_f32(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+      const float32x4_t xx1 = vsubq_f32(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+      const float32x4_t x3i0_3r0_3i1_x3r1 = vrev64q_f32(x3r0_3i0_3r1_x3i1);
+      const float32x4_t x1_x3_add =
+          vmlaq_f32(x1r0_1i0_1r1_x1i1, vec_swap_sign, x3i0_3r0_3i1_x3r1);
+      const float32x4_t x1_x3_sub =
+          vmlsq_f32(x1r0_1i0_1r1_x1i1, vec_swap_sign, x3i0_3r0_3i1_x3r1);
+      float32x4_t xx4 = vmulq_f32(wk2rv, xx1);
+      float32x4_t xx12 = vmulq_f32(wk1rv, x1_x3_add);
+      float32x4_t xx22 = vmulq_f32(wk3rv, x1_x3_sub);
+      xx4 = vmlaq_f32(xx4, wk2iv, vrev64q_f32(xx1));
+      xx12 = vmlaq_f32(xx12, wk1iv, vrev64q_f32(x1_x3_add));
+      xx22 = vmlaq_f32(xx22, wk3iv, vrev64q_f32(x1_x3_sub));
+
+      vst1_f32(&a[j + 0], vget_low_f32(xx));
+      vst1_f32(&a[j + 32], vget_high_f32(xx));
+      vst1_f32(&a[j + 16], vget_low_f32(xx4));
+      vst1_f32(&a[j + 48], vget_high_f32(xx4));
+      vst1_f32(&a[j + 8], vget_low_f32(xx12));
+      vst1_f32(&a[j + 40], vget_high_f32(xx12));
+      vst1_f32(&a[j + 24], vget_low_f32(xx22));
+      vst1_f32(&a[j + 56], vget_high_f32(xx22));
+    }
+  }
+}
+
+__inline static float32x4_t reverse_order_f32x4(float32x4_t in) {
+  // A B C D -> C D A B
+  const float32x4_t rev = vcombine_f32(vget_high_f32(in), vget_low_f32(in));
+  // C D A B -> D C B A
+  return vrev64q_f32(rev);
+}
+
+void rftfsub_128_neon(float* a) {
+  const float* c = rdft_w + 32;
+  int j1, j2;
+  const float32x4_t mm_half = vdupq_n_f32(0.5f);
+
+  // Vectorized code (four at once).
+  // Note: commented number are indexes for the first iteration of the loop.
+  for (j1 = 1, j2 = 2; j2 + 7 < 64; j1 += 4, j2 += 8) {
+    // Load 'wk'.
+    const float32x4_t c_j1 = vld1q_f32(&c[j1]);          //  1,  2,  3,  4,
+    const float32x4_t c_k1 = vld1q_f32(&c[29 - j1]);     // 28, 29, 30, 31,
+    const float32x4_t wkrt = vsubq_f32(mm_half, c_k1);   // 28, 29, 30, 31,
+    const float32x4_t wkr_ = reverse_order_f32x4(wkrt);  // 31, 30, 29, 28,
+    const float32x4_t wki_ = c_j1;                       //  1,  2,  3,  4,
+    // Load and shuffle 'a'.
+    //   2,   4,   6,   8,   3,   5,   7,   9
+    float32x4x2_t a_j2_p = vld2q_f32(&a[0 + j2]);
+    // 120, 122, 124, 126, 121, 123, 125, 127,
+    const float32x4x2_t k2_0_4 = vld2q_f32(&a[122 - j2]);
+    // 126, 124, 122, 120
+    const float32x4_t a_k2_p0 = reverse_order_f32x4(k2_0_4.val[0]);
+    // 127, 125, 123, 121
+    const float32x4_t a_k2_p1 = reverse_order_f32x4(k2_0_4.val[1]);
+    // Calculate 'x'.
+    const float32x4_t xr_ = vsubq_f32(a_j2_p.val[0], a_k2_p0);
+    // 2-126, 4-124, 6-122, 8-120,
+    const float32x4_t xi_ = vaddq_f32(a_j2_p.val[1], a_k2_p1);
+    // 3-127, 5-125, 7-123, 9-121,
+    // Calculate product into 'y'.
+    //    yr = wkr * xr - wki * xi;
+    //    yi = wkr * xi + wki * xr;
+    const float32x4_t a_ = vmulq_f32(wkr_, xr_);
+    const float32x4_t b_ = vmulq_f32(wki_, xi_);
+    const float32x4_t c_ = vmulq_f32(wkr_, xi_);
+    const float32x4_t d_ = vmulq_f32(wki_, xr_);
+    const float32x4_t yr_ = vsubq_f32(a_, b_);  // 2-126, 4-124, 6-122, 8-120,
+    const float32x4_t yi_ = vaddq_f32(c_, d_);  // 3-127, 5-125, 7-123, 9-121,
+                                                // Update 'a'.
+                                                //    a[j2 + 0] -= yr;
+                                                //    a[j2 + 1] -= yi;
+                                                //    a[k2 + 0] += yr;
+                                                //    a[k2 + 1] -= yi;
+    // 126, 124, 122, 120,
+    const float32x4_t a_k2_p0n = vaddq_f32(a_k2_p0, yr_);
+    // 127, 125, 123, 121,
+    const float32x4_t a_k2_p1n = vsubq_f32(a_k2_p1, yi_);
+    // Shuffle in right order and store.
+    const float32x4_t a_k2_p0nr = vrev64q_f32(a_k2_p0n);
+    const float32x4_t a_k2_p1nr = vrev64q_f32(a_k2_p1n);
+    // 124, 125, 126, 127, 120, 121, 122, 123
+    const float32x4x2_t a_k2_n = vzipq_f32(a_k2_p0nr, a_k2_p1nr);
+    //   2,   4,   6,   8,
+    a_j2_p.val[0] = vsubq_f32(a_j2_p.val[0], yr_);
+    //   3,   5,   7,   9,
+    a_j2_p.val[1] = vsubq_f32(a_j2_p.val[1], yi_);
+    //   2,   3,   4,   5,   6,   7,   8,   9,
+    vst2q_f32(&a[0 + j2], a_j2_p);
+
+    vst1q_f32(&a[122 - j2], a_k2_n.val[1]);
+    vst1q_f32(&a[126 - j2], a_k2_n.val[0]);
+  }
+
+  // Scalar code for the remaining items.
+  for (; j2 < 64; j1 += 1, j2 += 2) {
+    const int k2 = 128 - j2;
+    const int k1 = 32 - j1;
+    const float wkr = 0.5f - c[k1];
+    const float wki = c[j1];
+    const float xr = a[j2 + 0] - a[k2 + 0];
+    const float xi = a[j2 + 1] + a[k2 + 1];
+    const float yr = wkr * xr - wki * xi;
+    const float yi = wkr * xi + wki * xr;
+    a[j2 + 0] -= yr;
+    a[j2 + 1] -= yi;
+    a[k2 + 0] += yr;
+    a[k2 + 1] -= yi;
+  }
+}
+
+void rftbsub_128_neon(float* a) {
+  const float* c = rdft_w + 32;
+  int j1, j2;
+  const float32x4_t mm_half = vdupq_n_f32(0.5f);
+
+  a[1] = -a[1];
+  // Vectorized code (four at once).
+  //    Note: commented number are indexes for the first iteration of the loop.
+  for (j1 = 1, j2 = 2; j2 + 7 < 64; j1 += 4, j2 += 8) {
+    // Load 'wk'.
+    const float32x4_t c_j1 = vld1q_f32(&c[j1]);          //  1,  2,  3,  4,
+    const float32x4_t c_k1 = vld1q_f32(&c[29 - j1]);     // 28, 29, 30, 31,
+    const float32x4_t wkrt = vsubq_f32(mm_half, c_k1);   // 28, 29, 30, 31,
+    const float32x4_t wkr_ = reverse_order_f32x4(wkrt);  // 31, 30, 29, 28,
+    const float32x4_t wki_ = c_j1;                       //  1,  2,  3,  4,
+    // Load and shuffle 'a'.
+    //   2,   4,   6,   8,   3,   5,   7,   9
+    float32x4x2_t a_j2_p = vld2q_f32(&a[0 + j2]);
+    // 120, 122, 124, 126, 121, 123, 125, 127,
+    const float32x4x2_t k2_0_4 = vld2q_f32(&a[122 - j2]);
+    // 126, 124, 122, 120
+    const float32x4_t a_k2_p0 = reverse_order_f32x4(k2_0_4.val[0]);
+    // 127, 125, 123, 121
+    const float32x4_t a_k2_p1 = reverse_order_f32x4(k2_0_4.val[1]);
+    // Calculate 'x'.
+    const float32x4_t xr_ = vsubq_f32(a_j2_p.val[0], a_k2_p0);
+    // 2-126, 4-124, 6-122, 8-120,
+    const float32x4_t xi_ = vaddq_f32(a_j2_p.val[1], a_k2_p1);
+    // 3-127, 5-125, 7-123, 9-121,
+    // Calculate product into 'y'.
+    //    yr = wkr * xr - wki * xi;
+    //    yi = wkr * xi + wki * xr;
+    const float32x4_t a_ = vmulq_f32(wkr_, xr_);
+    const float32x4_t b_ = vmulq_f32(wki_, xi_);
+    const float32x4_t c_ = vmulq_f32(wkr_, xi_);
+    const float32x4_t d_ = vmulq_f32(wki_, xr_);
+    const float32x4_t yr_ = vaddq_f32(a_, b_);  // 2-126, 4-124, 6-122, 8-120,
+    const float32x4_t yi_ = vsubq_f32(c_, d_);  // 3-127, 5-125, 7-123, 9-121,
+                                                // Update 'a'.
+                                                //    a[j2 + 0] -= yr;
+                                                //    a[j2 + 1] -= yi;
+                                                //    a[k2 + 0] += yr;
+                                                //    a[k2 + 1] -= yi;
+    // 126, 124, 122, 120,
+    const float32x4_t a_k2_p0n = vaddq_f32(a_k2_p0, yr_);
+    // 127, 125, 123, 121,
+    const float32x4_t a_k2_p1n = vsubq_f32(yi_, a_k2_p1);
+    // Shuffle in right order and store.
+    //   2,   3,   4,   5,   6,   7,   8,   9,
+    const float32x4_t a_k2_p0nr = vrev64q_f32(a_k2_p0n);
+    const float32x4_t a_k2_p1nr = vrev64q_f32(a_k2_p1n);
+    // 124, 125, 126, 127, 120, 121, 122, 123
+    const float32x4x2_t a_k2_n = vzipq_f32(a_k2_p0nr, a_k2_p1nr);
+    //   2,   4,   6,   8,
+    a_j2_p.val[0] = vsubq_f32(a_j2_p.val[0], yr_);
+    //   3,   5,   7,   9,
+    a_j2_p.val[1] = vsubq_f32(yi_, a_j2_p.val[1]);
+    //   2,   3,   4,   5,   6,   7,   8,   9,
+    vst2q_f32(&a[0 + j2], a_j2_p);
+
+    vst1q_f32(&a[122 - j2], a_k2_n.val[1]);
+    vst1q_f32(&a[126 - j2], a_k2_n.val[0]);
+  }
+
+  // Scalar code for the remaining items.
+  for (; j2 < 64; j1 += 1, j2 += 2) {
+    const int k2 = 128 - j2;
+    const int k1 = 32 - j1;
+    const float wkr = 0.5f - c[k1];
+    const float wki = c[j1];
+    const float xr = a[j2 + 0] - a[k2 + 0];
+    const float xi = a[j2 + 1] + a[k2 + 1];
+    const float yr = wkr * xr + wki * xi;
+    const float yi = wkr * xi - wki * xr;
+    a[j2 + 0] = a[j2 + 0] - yr;
+    a[j2 + 1] = yi - a[j2 + 1];
+    a[k2 + 0] = yr + a[k2 + 0];
+    a[k2 + 1] = yi - a[k2 + 1];
+  }
+  a[65] = -a[65];
+}
+#endif
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc
new file mode 100644
index 0000000000..7f0802ddfa
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc
@@ -0,0 +1,439 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <emmintrin.h>
+#include <xmmintrin.h>
+
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft.h"
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_common.h"
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_neon_sse2.h"
+#include "rtc_base/system/arch.h"
+
+namespace webrtc {
+
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+
+namespace {
+// These intrinsics were unavailable before VS 2008.
+// TODO(andrew): move to a common file.
+#if defined(_MSC_VER) && _MSC_VER < 1500
+static __inline __m128 _mm_castsi128_ps(__m128i a) {
+  return *(__m128*)&a;
+}
+static __inline __m128i _mm_castps_si128(__m128 a) {
+  return *(__m128i*)&a;
+}
+#endif
+
+}  // namespace
+
+void cft1st_128_SSE2(float* a) {
+  const __m128 mm_swap_sign = _mm_load_ps(k_swap_sign);
+  int j, k2;
+
+  for (k2 = 0, j = 0; j < 128; j += 16, k2 += 4) {
+    __m128 a00v = _mm_loadu_ps(&a[j + 0]);
+    __m128 a04v = _mm_loadu_ps(&a[j + 4]);
+    __m128 a08v = _mm_loadu_ps(&a[j + 8]);
+    __m128 a12v = _mm_loadu_ps(&a[j + 12]);
+    __m128 a01v = _mm_shuffle_ps(a00v, a08v, _MM_SHUFFLE(1, 0, 1, 0));
+    __m128 a23v = _mm_shuffle_ps(a00v, a08v, _MM_SHUFFLE(3, 2, 3, 2));
+    __m128 a45v = _mm_shuffle_ps(a04v, a12v, _MM_SHUFFLE(1, 0, 1, 0));
+    __m128 a67v = _mm_shuffle_ps(a04v, a12v, _MM_SHUFFLE(3, 2, 3, 2));
+
+    const __m128 wk1rv = _mm_load_ps(&rdft_wk1r[k2]);
+    const __m128 wk1iv = _mm_load_ps(&rdft_wk1i[k2]);
+    const __m128 wk2rv = _mm_load_ps(&rdft_wk2r[k2]);
+    const __m128 wk2iv = _mm_load_ps(&rdft_wk2i[k2]);
+    const __m128 wk3rv = _mm_load_ps(&rdft_wk3r[k2]);
+    const __m128 wk3iv = _mm_load_ps(&rdft_wk3i[k2]);
+    __m128 x0v = _mm_add_ps(a01v, a23v);
+    const __m128 x1v = _mm_sub_ps(a01v, a23v);
+    const __m128 x2v = _mm_add_ps(a45v, a67v);
+    const __m128 x3v = _mm_sub_ps(a45v, a67v);
+    __m128 x0w;
+    a01v = _mm_add_ps(x0v, x2v);
+    x0v = _mm_sub_ps(x0v, x2v);
+    x0w = _mm_shuffle_ps(x0v, x0v, _MM_SHUFFLE(2, 3, 0, 1));
+    {
+      const __m128 a45_0v = _mm_mul_ps(wk2rv, x0v);
+      const __m128 a45_1v = _mm_mul_ps(wk2iv, x0w);
+      a45v = _mm_add_ps(a45_0v, a45_1v);
+    }
+    {
+      __m128 a23_0v, a23_1v;
+      const __m128 x3w = _mm_shuffle_ps(x3v, x3v, _MM_SHUFFLE(2, 3, 0, 1));
+      const __m128 x3s = _mm_mul_ps(mm_swap_sign, x3w);
+      x0v = _mm_add_ps(x1v, x3s);
+      x0w = _mm_shuffle_ps(x0v, x0v, _MM_SHUFFLE(2, 3, 0, 1));
+      a23_0v = _mm_mul_ps(wk1rv, x0v);
+      a23_1v = _mm_mul_ps(wk1iv, x0w);
+      a23v = _mm_add_ps(a23_0v, a23_1v);
+
+      x0v = _mm_sub_ps(x1v, x3s);
+      x0w = _mm_shuffle_ps(x0v, x0v, _MM_SHUFFLE(2, 3, 0, 1));
+    }
+    {
+      const __m128 a67_0v = _mm_mul_ps(wk3rv, x0v);
+      const __m128 a67_1v = _mm_mul_ps(wk3iv, x0w);
+      a67v = _mm_add_ps(a67_0v, a67_1v);
+    }
+
+    a00v = _mm_shuffle_ps(a01v, a23v, _MM_SHUFFLE(1, 0, 1, 0));
+    a04v = _mm_shuffle_ps(a45v, a67v, _MM_SHUFFLE(1, 0, 1, 0));
+    a08v = _mm_shuffle_ps(a01v, a23v, _MM_SHUFFLE(3, 2, 3, 2));
+    a12v = _mm_shuffle_ps(a45v, a67v, _MM_SHUFFLE(3, 2, 3, 2));
+    _mm_storeu_ps(&a[j + 0], a00v);
+    _mm_storeu_ps(&a[j + 4], a04v);
+    _mm_storeu_ps(&a[j + 8], a08v);
+    _mm_storeu_ps(&a[j + 12], a12v);
+  }
+}
+
+void cftmdl_128_SSE2(float* a) {
+  const int l = 8;
+  const __m128 mm_swap_sign = _mm_load_ps(k_swap_sign);
+  int j0;
+
+  __m128 wk1rv = _mm_load_ps(cftmdl_wk1r);
+  for (j0 = 0; j0 < l; j0 += 2) {
+    const __m128i a_00 = _mm_loadl_epi64((__m128i*)&a[j0 + 0]);
+    const __m128i a_08 = _mm_loadl_epi64((__m128i*)&a[j0 + 8]);
+    const __m128i a_32 = _mm_loadl_epi64((__m128i*)&a[j0 + 32]);
+    const __m128i a_40 = _mm_loadl_epi64((__m128i*)&a[j0 + 40]);
+    const __m128 a_00_32 =
+        _mm_shuffle_ps(_mm_castsi128_ps(a_00), _mm_castsi128_ps(a_32),
+                       _MM_SHUFFLE(1, 0, 1, 0));
+    const __m128 a_08_40 =
+        _mm_shuffle_ps(_mm_castsi128_ps(a_08), _mm_castsi128_ps(a_40),
+                       _MM_SHUFFLE(1, 0, 1, 0));
+    __m128 x0r0_0i0_0r1_x0i1 = _mm_add_ps(a_00_32, a_08_40);
+    const __m128 x1r0_1i0_1r1_x1i1 = _mm_sub_ps(a_00_32, a_08_40);
+
+    const __m128i a_16 = _mm_loadl_epi64((__m128i*)&a[j0 + 16]);
+    const __m128i a_24 = _mm_loadl_epi64((__m128i*)&a[j0 + 24]);
+    const __m128i a_48 = _mm_loadl_epi64((__m128i*)&a[j0 + 48]);
+    const __m128i a_56 = _mm_loadl_epi64((__m128i*)&a[j0 + 56]);
+    const __m128 a_16_48 =
+        _mm_shuffle_ps(_mm_castsi128_ps(a_16), _mm_castsi128_ps(a_48),
+                       _MM_SHUFFLE(1, 0, 1, 0));
+    const __m128 a_24_56 =
+        _mm_shuffle_ps(_mm_castsi128_ps(a_24), _mm_castsi128_ps(a_56),
+                       _MM_SHUFFLE(1, 0, 1, 0));
+    const __m128 x2r0_2i0_2r1_x2i1 = _mm_add_ps(a_16_48, a_24_56);
+    const __m128 x3r0_3i0_3r1_x3i1 = _mm_sub_ps(a_16_48, a_24_56);
+
+    const __m128 xx0 = _mm_add_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+    const __m128 xx1 = _mm_sub_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+
+    const __m128 x3i0_3r0_3i1_x3r1 = _mm_castsi128_ps(_mm_shuffle_epi32(
+        _mm_castps_si128(x3r0_3i0_3r1_x3i1), _MM_SHUFFLE(2, 3, 0, 1)));
+    const __m128 x3_swapped = _mm_mul_ps(mm_swap_sign, x3i0_3r0_3i1_x3r1);
+    const __m128 x1_x3_add = _mm_add_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
+    const __m128 x1_x3_sub = _mm_sub_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
+
+    const __m128 yy0 =
+        _mm_shuffle_ps(x1_x3_add, x1_x3_sub, _MM_SHUFFLE(2, 2, 2, 2));
+    const __m128 yy1 =
+        _mm_shuffle_ps(x1_x3_add, x1_x3_sub, _MM_SHUFFLE(3, 3, 3, 3));
+    const __m128 yy2 = _mm_mul_ps(mm_swap_sign, yy1);
+    const __m128 yy3 = _mm_add_ps(yy0, yy2);
+    const __m128 yy4 = _mm_mul_ps(wk1rv, yy3);
+
+    _mm_storel_epi64((__m128i*)&a[j0 + 0], _mm_castps_si128(xx0));
+    _mm_storel_epi64(
+        (__m128i*)&a[j0 + 32],
+        _mm_shuffle_epi32(_mm_castps_si128(xx0), _MM_SHUFFLE(3, 2, 3, 2)));
+
+    _mm_storel_epi64((__m128i*)&a[j0 + 16], _mm_castps_si128(xx1));
+    _mm_storel_epi64(
+        (__m128i*)&a[j0 + 48],
+        _mm_shuffle_epi32(_mm_castps_si128(xx1), _MM_SHUFFLE(2, 3, 2, 3)));
+    a[j0 + 48] = -a[j0 + 48];
+
+    _mm_storel_epi64((__m128i*)&a[j0 + 8], _mm_castps_si128(x1_x3_add));
+    _mm_storel_epi64((__m128i*)&a[j0 + 24], _mm_castps_si128(x1_x3_sub));
+
+    _mm_storel_epi64((__m128i*)&a[j0 + 40], _mm_castps_si128(yy4));
+    _mm_storel_epi64(
+        (__m128i*)&a[j0 + 56],
+        _mm_shuffle_epi32(_mm_castps_si128(yy4), _MM_SHUFFLE(2, 3, 2, 3)));
+  }
+
+  {
+    int k = 64;
+    int k1 = 2;
+    int k2 = 2 * k1;
+    const __m128 wk2rv = _mm_load_ps(&rdft_wk2r[k2 + 0]);
+    const __m128 wk2iv = _mm_load_ps(&rdft_wk2i[k2 + 0]);
+    const __m128 wk1iv = _mm_load_ps(&rdft_wk1i[k2 + 0]);
+    const __m128 wk3rv = _mm_load_ps(&rdft_wk3r[k2 + 0]);
+    const __m128 wk3iv = _mm_load_ps(&rdft_wk3i[k2 + 0]);
+    wk1rv = _mm_load_ps(&rdft_wk1r[k2 + 0]);
+    for (j0 = k; j0 < l + k; j0 += 2) {
+      const __m128i a_00 = _mm_loadl_epi64((__m128i*)&a[j0 + 0]);
+      const __m128i a_08 = _mm_loadl_epi64((__m128i*)&a[j0 + 8]);
+      const __m128i a_32 = _mm_loadl_epi64((__m128i*)&a[j0 + 32]);
+      const __m128i a_40 = _mm_loadl_epi64((__m128i*)&a[j0 + 40]);
+      const __m128 a_00_32 =
+          _mm_shuffle_ps(_mm_castsi128_ps(a_00), _mm_castsi128_ps(a_32),
+                         _MM_SHUFFLE(1, 0, 1, 0));
+      const __m128 a_08_40 =
+          _mm_shuffle_ps(_mm_castsi128_ps(a_08), _mm_castsi128_ps(a_40),
+                         _MM_SHUFFLE(1, 0, 1, 0));
+      __m128 x0r0_0i0_0r1_x0i1 = _mm_add_ps(a_00_32, a_08_40);
+      const __m128 x1r0_1i0_1r1_x1i1 = _mm_sub_ps(a_00_32, a_08_40);
+
+      const __m128i a_16 = _mm_loadl_epi64((__m128i*)&a[j0 + 16]);
+      const __m128i a_24 = _mm_loadl_epi64((__m128i*)&a[j0 + 24]);
+      const __m128i a_48 = _mm_loadl_epi64((__m128i*)&a[j0 + 48]);
+      const __m128i a_56 = _mm_loadl_epi64((__m128i*)&a[j0 + 56]);
+      const __m128 a_16_48 =
+          _mm_shuffle_ps(_mm_castsi128_ps(a_16), _mm_castsi128_ps(a_48),
+                         _MM_SHUFFLE(1, 0, 1, 0));
+      const __m128 a_24_56 =
+          _mm_shuffle_ps(_mm_castsi128_ps(a_24), _mm_castsi128_ps(a_56),
+                         _MM_SHUFFLE(1, 0, 1, 0));
+      const __m128 x2r0_2i0_2r1_x2i1 = _mm_add_ps(a_16_48, a_24_56);
+      const __m128 x3r0_3i0_3r1_x3i1 = _mm_sub_ps(a_16_48, a_24_56);
+
+      const __m128 xx = _mm_add_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+      const __m128 xx1 = _mm_sub_ps(x0r0_0i0_0r1_x0i1, x2r0_2i0_2r1_x2i1);
+      const __m128 xx2 = _mm_mul_ps(xx1, wk2rv);
+      const __m128 xx3 = _mm_mul_ps(
+          wk2iv, _mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(xx1),
+                                                    _MM_SHUFFLE(2, 3, 0, 1))));
+      const __m128 xx4 = _mm_add_ps(xx2, xx3);
+
+      const __m128 x3i0_3r0_3i1_x3r1 = _mm_castsi128_ps(_mm_shuffle_epi32(
+          _mm_castps_si128(x3r0_3i0_3r1_x3i1), _MM_SHUFFLE(2, 3, 0, 1)));
+      const __m128 x3_swapped = _mm_mul_ps(mm_swap_sign, x3i0_3r0_3i1_x3r1);
+      const __m128 x1_x3_add = _mm_add_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
+      const __m128 x1_x3_sub = _mm_sub_ps(x1r0_1i0_1r1_x1i1, x3_swapped);
+
+      const __m128 xx10 = _mm_mul_ps(x1_x3_add, wk1rv);
+      const __m128 xx11 = _mm_mul_ps(
+          wk1iv, _mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(x1_x3_add),
+                                                    _MM_SHUFFLE(2, 3, 0, 1))));
+      const __m128 xx12 = _mm_add_ps(xx10, xx11);
+
+      const __m128 xx20 = _mm_mul_ps(x1_x3_sub, wk3rv);
+      const __m128 xx21 = _mm_mul_ps(
+          wk3iv, _mm_castsi128_ps(_mm_shuffle_epi32(_mm_castps_si128(x1_x3_sub),
+                                                    _MM_SHUFFLE(2, 3, 0, 1))));
+      const __m128 xx22 = _mm_add_ps(xx20, xx21);
+
+      _mm_storel_epi64((__m128i*)&a[j0 + 0], _mm_castps_si128(xx));
+      _mm_storel_epi64(
+          (__m128i*)&a[j0 + 32],
+          _mm_shuffle_epi32(_mm_castps_si128(xx), _MM_SHUFFLE(3, 2, 3, 2)));
+
+      _mm_storel_epi64((__m128i*)&a[j0 + 16], _mm_castps_si128(xx4));
+      _mm_storel_epi64(
+          (__m128i*)&a[j0 + 48],
+          _mm_shuffle_epi32(_mm_castps_si128(xx4), _MM_SHUFFLE(3, 2, 3, 2)));
+
+      _mm_storel_epi64((__m128i*)&a[j0 + 8], _mm_castps_si128(xx12));
+      _mm_storel_epi64(
+          (__m128i*)&a[j0 + 40],
+          _mm_shuffle_epi32(_mm_castps_si128(xx12), _MM_SHUFFLE(3, 2, 3, 2)));
+
+      _mm_storel_epi64((__m128i*)&a[j0 + 24], _mm_castps_si128(xx22));
+      _mm_storel_epi64(
+          (__m128i*)&a[j0 + 56],
+          _mm_shuffle_epi32(_mm_castps_si128(xx22), _MM_SHUFFLE(3, 2, 3, 2)));
+    }
+  }
+}
+
+void rftfsub_128_SSE2(float* a) {
+  const float* c = rdft_w + 32;
+  int j1, j2, k1, k2;
+  float wkr, wki, xr, xi, yr, yi;
+
+  static const ALIGN16_BEG float ALIGN16_END k_half[4] = {0.5f, 0.5f, 0.5f,
+                                                          0.5f};
+  const __m128 mm_half = _mm_load_ps(k_half);
+
+  // Vectorized code (four at once).
+  //    Note: commented number are indexes for the first iteration of the loop.
+  for (j1 = 1, j2 = 2; j2 + 7 < 64; j1 += 4, j2 += 8) {
+    // Load 'wk'.
+    const __m128 c_j1 = _mm_loadu_ps(&c[j1]);       //  1,  2,  3,  4,
+    const __m128 c_k1 = _mm_loadu_ps(&c[29 - j1]);  // 28, 29, 30, 31,
+    const __m128 wkrt = _mm_sub_ps(mm_half, c_k1);  // 28, 29, 30, 31,
+    const __m128 wkr_ =
+        _mm_shuffle_ps(wkrt, wkrt, _MM_SHUFFLE(0, 1, 2, 3));  // 31, 30, 29, 28,
+    const __m128 wki_ = c_j1;                                 //  1,  2,  3,  4,
+    // Load and shuffle 'a'.
+    const __m128 a_j2_0 = _mm_loadu_ps(&a[0 + j2]);    //   2,   3,   4,   5,
+    const __m128 a_j2_4 = _mm_loadu_ps(&a[4 + j2]);    //   6,   7,   8,   9,
+    const __m128 a_k2_0 = _mm_loadu_ps(&a[122 - j2]);  // 120, 121, 122, 123,
+    const __m128 a_k2_4 = _mm_loadu_ps(&a[126 - j2]);  // 124, 125, 126, 127,
+    const __m128 a_j2_p0 = _mm_shuffle_ps(
+        a_j2_0, a_j2_4, _MM_SHUFFLE(2, 0, 2, 0));  //   2,   4,   6,   8,
+    const __m128 a_j2_p1 = _mm_shuffle_ps(
+        a_j2_0, a_j2_4, _MM_SHUFFLE(3, 1, 3, 1));  //   3,   5,   7,   9,
+    const __m128 a_k2_p0 = _mm_shuffle_ps(
+        a_k2_4, a_k2_0, _MM_SHUFFLE(0, 2, 0, 2));  // 126, 124, 122, 120,
+    const __m128 a_k2_p1 = _mm_shuffle_ps(
+        a_k2_4, a_k2_0, _MM_SHUFFLE(1, 3, 1, 3));  // 127, 125, 123, 121,
+    // Calculate 'x'.
+    const __m128 xr_ = _mm_sub_ps(a_j2_p0, a_k2_p0);
+    // 2-126, 4-124, 6-122, 8-120,
+    const __m128 xi_ = _mm_add_ps(a_j2_p1, a_k2_p1);
+    // 3-127, 5-125, 7-123, 9-121,
+    // Calculate product into 'y'.
+    //    yr = wkr * xr - wki * xi;
+    //    yi = wkr * xi + wki * xr;
+    const __m128 a_ = _mm_mul_ps(wkr_, xr_);
+    const __m128 b_ = _mm_mul_ps(wki_, xi_);
+    const __m128 c_ = _mm_mul_ps(wkr_, xi_);
+    const __m128 d_ = _mm_mul_ps(wki_, xr_);
+    const __m128 yr_ = _mm_sub_ps(a_, b_);  // 2-126, 4-124, 6-122, 8-120,
+    const __m128 yi_ = _mm_add_ps(c_, d_);  // 3-127, 5-125, 7-123, 9-121,
+                                            // Update 'a'.
+                                            //    a[j2 + 0] -= yr;
+                                            //    a[j2 + 1] -= yi;
+                                            //    a[k2 + 0] += yr;
+    //    a[k2 + 1] -= yi;
+    const __m128 a_j2_p0n = _mm_sub_ps(a_j2_p0, yr_);  //   2,   4,   6,   8,
+    const __m128 a_j2_p1n = _mm_sub_ps(a_j2_p1, yi_);  //   3,   5,   7,   9,
+    const __m128 a_k2_p0n = _mm_add_ps(a_k2_p0, yr_);  // 126, 124, 122, 120,
+    const __m128 a_k2_p1n = _mm_sub_ps(a_k2_p1, yi_);  // 127, 125, 123, 121,
+    // Shuffle in right order and store.
+    const __m128 a_j2_0n = _mm_unpacklo_ps(a_j2_p0n, a_j2_p1n);
+    //   2,   3,   4,   5,
+    const __m128 a_j2_4n = _mm_unpackhi_ps(a_j2_p0n, a_j2_p1n);
+    //   6,   7,   8,   9,
+    const __m128 a_k2_0nt = _mm_unpackhi_ps(a_k2_p0n, a_k2_p1n);
+    // 122, 123, 120, 121,
+    const __m128 a_k2_4nt = _mm_unpacklo_ps(a_k2_p0n, a_k2_p1n);
+    // 126, 127, 124, 125,
+    const __m128 a_k2_0n = _mm_shuffle_ps(
+        a_k2_0nt, a_k2_0nt, _MM_SHUFFLE(1, 0, 3, 2));  // 120, 121, 122, 123,
+    const __m128 a_k2_4n = _mm_shuffle_ps(
+        a_k2_4nt, a_k2_4nt, _MM_SHUFFLE(1, 0, 3, 2));  // 124, 125, 126, 127,
+    _mm_storeu_ps(&a[0 + j2], a_j2_0n);
+    _mm_storeu_ps(&a[4 + j2], a_j2_4n);
+    _mm_storeu_ps(&a[122 - j2], a_k2_0n);
+    _mm_storeu_ps(&a[126 - j2], a_k2_4n);
+  }
+  // Scalar code for the remaining items.
+  for (; j2 < 64; j1 += 1, j2 += 2) {
+    k2 = 128 - j2;
+    k1 = 32 - j1;
+    wkr = 0.5f - c[k1];
+    wki = c[j1];
+    xr = a[j2 + 0] - a[k2 + 0];
+    xi = a[j2 + 1] + a[k2 + 1];
+    yr = wkr * xr - wki * xi;
+    yi = wkr * xi + wki * xr;
+    a[j2 + 0] -= yr;
+    a[j2 + 1] -= yi;
+    a[k2 + 0] += yr;
+    a[k2 + 1] -= yi;
+  }
+}
+
+void rftbsub_128_SSE2(float* a) {
+  const float* c = rdft_w + 32;
+  int j1, j2, k1, k2;
+  float wkr, wki, xr, xi, yr, yi;
+
+  static const ALIGN16_BEG float ALIGN16_END k_half[4] = {0.5f, 0.5f, 0.5f,
+                                                          0.5f};
+  const __m128 mm_half = _mm_load_ps(k_half);
+
+  a[1] = -a[1];
+  // Vectorized code (four at once).
+  //    Note: commented number are indexes for the first iteration of the loop.
+  for (j1 = 1, j2 = 2; j2 + 7 < 64; j1 += 4, j2 += 8) {
+    // Load 'wk'.
+    const __m128 c_j1 = _mm_loadu_ps(&c[j1]);       //  1,  2,  3,  4,
+    const __m128 c_k1 = _mm_loadu_ps(&c[29 - j1]);  // 28, 29, 30, 31,
+    const __m128 wkrt = _mm_sub_ps(mm_half, c_k1);  // 28, 29, 30, 31,
+    const __m128 wkr_ =
+        _mm_shuffle_ps(wkrt, wkrt, _MM_SHUFFLE(0, 1, 2, 3));  // 31, 30, 29, 28,
+    const __m128 wki_ = c_j1;                                 //  1,  2,  3,  4,
+    // Load and shuffle 'a'.
+    const __m128 a_j2_0 = _mm_loadu_ps(&a[0 + j2]);    //   2,   3,   4,   5,
+    const __m128 a_j2_4 = _mm_loadu_ps(&a[4 + j2]);    //   6,   7,   8,   9,
+    const __m128 a_k2_0 = _mm_loadu_ps(&a[122 - j2]);  // 120, 121, 122, 123,
+    const __m128 a_k2_4 = _mm_loadu_ps(&a[126 - j2]);  // 124, 125, 126, 127,
+    const __m128 a_j2_p0 = _mm_shuffle_ps(
+        a_j2_0, a_j2_4, _MM_SHUFFLE(2, 0, 2, 0));  //   2,   4,   6,   8,
+    const __m128 a_j2_p1 = _mm_shuffle_ps(
+        a_j2_0, a_j2_4, _MM_SHUFFLE(3, 1, 3, 1));  //   3,   5,   7,   9,
+    const __m128 a_k2_p0 = _mm_shuffle_ps(
+        a_k2_4, a_k2_0, _MM_SHUFFLE(0, 2, 0, 2));  // 126, 124, 122, 120,
+    const __m128 a_k2_p1 = _mm_shuffle_ps(
+        a_k2_4, a_k2_0, _MM_SHUFFLE(1, 3, 1, 3));  // 127, 125, 123, 121,
+    // Calculate 'x'.
+    const __m128 xr_ = _mm_sub_ps(a_j2_p0, a_k2_p0);
+    // 2-126, 4-124, 6-122, 8-120,
+    const __m128 xi_ = _mm_add_ps(a_j2_p1, a_k2_p1);
+    // 3-127, 5-125, 7-123, 9-121,
+    // Calculate product into 'y'.
+    //    yr = wkr * xr + wki * xi;
+    //    yi = wkr * xi - wki * xr;
+    const __m128 a_ = _mm_mul_ps(wkr_, xr_);
+    const __m128 b_ = _mm_mul_ps(wki_, xi_);
+    const __m128 c_ = _mm_mul_ps(wkr_, xi_);
+    const __m128 d_ = _mm_mul_ps(wki_, xr_);
+    const __m128 yr_ = _mm_add_ps(a_, b_);  // 2-126, 4-124, 6-122, 8-120,
+    const __m128 yi_ = _mm_sub_ps(c_, d_);  // 3-127, 5-125, 7-123, 9-121,
+                                            // Update 'a'.
+                                            //    a[j2 + 0] = a[j2 + 0] - yr;
+                                            //    a[j2 + 1] = yi - a[j2 + 1];
+                                            //    a[k2 + 0] = yr + a[k2 + 0];
+    //    a[k2 + 1] = yi - a[k2 + 1];
+    const __m128 a_j2_p0n = _mm_sub_ps(a_j2_p0, yr_);  //   2,   4,   6,   8,
+    const __m128 a_j2_p1n = _mm_sub_ps(yi_, a_j2_p1);  //   3,   5,   7,   9,
+    const __m128 a_k2_p0n = _mm_add_ps(a_k2_p0, yr_);  // 126, 124, 122, 120,
+    const __m128 a_k2_p1n = _mm_sub_ps(yi_, a_k2_p1);  // 127, 125, 123, 121,
+    // Shuffle in right order and store.
+    const __m128 a_j2_0n = _mm_unpacklo_ps(a_j2_p0n, a_j2_p1n);
+    //   2,   3,   4,   5,
+    const __m128 a_j2_4n = _mm_unpackhi_ps(a_j2_p0n, a_j2_p1n);
+    //   6,   7,   8,   9,
+    const __m128 a_k2_0nt = _mm_unpackhi_ps(a_k2_p0n, a_k2_p1n);
+    // 122, 123, 120, 121,
+    const __m128 a_k2_4nt = _mm_unpacklo_ps(a_k2_p0n, a_k2_p1n);
+    // 126, 127, 124, 125,
+    const __m128 a_k2_0n = _mm_shuffle_ps(
+        a_k2_0nt, a_k2_0nt, _MM_SHUFFLE(1, 0, 3, 2));  // 120, 121, 122, 123,
+    const __m128 a_k2_4n = _mm_shuffle_ps(
+        a_k2_4nt, a_k2_4nt, _MM_SHUFFLE(1, 0, 3, 2));  // 124, 125, 126, 127,
+    _mm_storeu_ps(&a[0 + j2], a_j2_0n);
+    _mm_storeu_ps(&a[4 + j2], a_j2_4n);
+    _mm_storeu_ps(&a[122 - j2], a_k2_0n);
+    _mm_storeu_ps(&a[126 - j2], a_k2_4n);
+  }
+  // Scalar code for the remaining items.
+  for (; j2 < 64; j1 += 1, j2 += 2) {
+    k2 = 128 - j2;
+    k1 = 32 - j1;
+    wkr = 0.5f - c[k1];
+    wki = c[j1];
+    xr = a[j2 + 0] - a[k2 + 0];
+    xi = a[j2 + 1] + a[k2 + 1];
+    yr = wkr * xr + wki * xi;
+    yi = wkr * xi - wki * xr;
+    a[j2 + 0] = a[j2 + 0] - yr;
+    a[j2 + 1] = yi - a[j2 + 1];
+    a[k2 + 0] = yr + a[k2 + 0];
+    a[k2 + 1] = yi - a[k2 + 1];
+  }
+  a[65] = -a[65];
+}
+#endif
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_common.h b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_common.h
new file mode 100644
index 0000000000..6db1dd9ae4
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_common.h
@@ -0,0 +1,54 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_TABLES_COMMON_H_
+#define MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_TABLES_COMMON_H_
+
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft.h"
+
+namespace webrtc {
+
+// This tables used to be computed at run-time. For example, refer to:
+// https://code.google.com/p/webrtc/source/browse/trunk/webrtc/modules/audio_processing/utility/apm_rdft.c?r=6564
+// to see the initialization code.
+// Constants shared by all paths (C, SSE2, NEON).
+const float rdft_w[64] = {
+    1.0000000000f, 0.0000000000f, 0.7071067691f, 0.7071067691f, 0.9238795638f,
+    0.3826834559f, 0.3826834559f, 0.9238795638f, 0.9807852507f, 0.1950903237f,
+    0.5555702448f, 0.8314695954f, 0.8314695954f, 0.5555702448f, 0.1950903237f,
+    0.9807852507f, 0.9951847196f, 0.0980171412f, 0.6343933344f, 0.7730104327f,
+    0.8819212914f, 0.4713967443f, 0.2902846634f, 0.9569403529f, 0.9569403529f,
+    0.2902846634f, 0.4713967443f, 0.8819212914f, 0.7730104327f, 0.6343933344f,
+    0.0980171412f, 0.9951847196f, 0.7071067691f, 0.4993977249f, 0.4975923598f,
+    0.4945882559f, 0.4903926253f, 0.4850156307f, 0.4784701765f, 0.4707720280f,
+    0.4619397819f, 0.4519946277f, 0.4409606457f, 0.4288643003f, 0.4157347977f,
+    0.4016037583f, 0.3865052164f, 0.3704755902f, 0.3535533845f, 0.3357794881f,
+    0.3171966672f, 0.2978496552f, 0.2777851224f, 0.2570513785f, 0.2356983721f,
+    0.2137775421f, 0.1913417280f, 0.1684449315f, 0.1451423317f, 0.1214900985f,
+    0.0975451618f, 0.0733652338f, 0.0490085706f, 0.0245338380f,
+};
+
+// Constants used by the C and MIPS paths.
+const float rdft_wk3ri_first[16] = {
+    1.000000000f, 0.000000000f, 0.382683456f,  0.923879564f,
+    0.831469536f, 0.555570245f, -0.195090353f, 0.980785251f,
+    0.956940353f, 0.290284693f, 0.098017156f,  0.995184720f,
+    0.634393334f, 0.773010492f, -0.471396863f, 0.881921172f,
+};
+const float rdft_wk3ri_second[16] = {
+    -0.707106769f, 0.707106769f,  -0.923879564f, -0.382683456f,
+    -0.980785251f, 0.195090353f,  -0.555570245f, -0.831469536f,
+    -0.881921172f, 0.471396863f,  -0.773010492f, -0.634393334f,
+    -0.995184720f, -0.098017156f, -0.290284693f, -0.956940353f,
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_TABLES_COMMON_H_
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_neon_sse2.h b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_neon_sse2.h
new file mode 100644
index 0000000000..a63d187018
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_tables_neon_sse2.h
@@ -0,0 +1,98 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_TABLES_NEON_SSE2_H_
+#define MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_TABLES_NEON_SSE2_H_
+
+#include "common_audio/third_party/ooura/fft_size_128/ooura_fft.h"
+#include "rtc_base/system/arch.h"
+
+#ifdef _MSC_VER /* visual c++ */
+#define ALIGN16_BEG __declspec(align(16))
+#define ALIGN16_END
+#else /* gcc or icc */
+#define ALIGN16_BEG
+#define ALIGN16_END __attribute__((aligned(16)))
+#endif
+
+namespace webrtc {
+
+// These tables used to be computed at run-time. For example, refer to:
+// https://code.google.com/p/webrtc/source/browse/trunk/webrtc/modules/audio_processing/utility/apm_rdft.c?r=6564
+// to see the initialization code.
+#if defined(WEBRTC_ARCH_X86_FAMILY) || defined(WEBRTC_HAS_NEON)
+// Constants used by SSE2 and NEON but initialized in the C path.
+const ALIGN16_BEG float ALIGN16_END k_swap_sign[4] = {-1.f, 1.f, -1.f, 1.f};
+
+ALIGN16_BEG const float ALIGN16_END rdft_wk1r[32] = {
+    1.000000000f, 1.000000000f, 0.707106769f, 0.707106769f, 0.923879564f,
+    0.923879564f, 0.382683456f, 0.382683456f, 0.980785251f, 0.980785251f,
+    0.555570245f, 0.555570245f, 0.831469595f, 0.831469595f, 0.195090324f,
+    0.195090324f, 0.995184720f, 0.995184720f, 0.634393334f, 0.634393334f,
+    0.881921291f, 0.881921291f, 0.290284663f, 0.290284663f, 0.956940353f,
+    0.956940353f, 0.471396744f, 0.471396744f, 0.773010433f, 0.773010433f,
+    0.098017141f, 0.098017141f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk2r[32] = {
+    1.000000000f,  1.000000000f,  -0.000000000f, -0.000000000f, 0.707106769f,
+    0.707106769f,  -0.707106769f, -0.707106769f, 0.923879564f,  0.923879564f,
+    -0.382683456f, -0.382683456f, 0.382683456f,  0.382683456f,  -0.923879564f,
+    -0.923879564f, 0.980785251f,  0.980785251f,  -0.195090324f, -0.195090324f,
+    0.555570245f,  0.555570245f,  -0.831469595f, -0.831469595f, 0.831469595f,
+    0.831469595f,  -0.555570245f, -0.555570245f, 0.195090324f,  0.195090324f,
+    -0.980785251f, -0.980785251f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk3r[32] = {
+    1.000000000f,  1.000000000f,  -0.707106769f, -0.707106769f, 0.382683456f,
+    0.382683456f,  -0.923879564f, -0.923879564f, 0.831469536f,  0.831469536f,
+    -0.980785251f, -0.980785251f, -0.195090353f, -0.195090353f, -0.555570245f,
+    -0.555570245f, 0.956940353f,  0.956940353f,  -0.881921172f, -0.881921172f,
+    0.098017156f,  0.098017156f,  -0.773010492f, -0.773010492f, 0.634393334f,
+    0.634393334f,  -0.995184720f, -0.995184720f, -0.471396863f, -0.471396863f,
+    -0.290284693f, -0.290284693f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk1i[32] = {
+    -0.000000000f, 0.000000000f,  -0.707106769f, 0.707106769f,  -0.382683456f,
+    0.382683456f,  -0.923879564f, 0.923879564f,  -0.195090324f, 0.195090324f,
+    -0.831469595f, 0.831469595f,  -0.555570245f, 0.555570245f,  -0.980785251f,
+    0.980785251f,  -0.098017141f, 0.098017141f,  -0.773010433f, 0.773010433f,
+    -0.471396744f, 0.471396744f,  -0.956940353f, 0.956940353f,  -0.290284663f,
+    0.290284663f,  -0.881921291f, 0.881921291f,  -0.634393334f, 0.634393334f,
+    -0.995184720f, 0.995184720f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk2i[32] = {
+    -0.000000000f, 0.000000000f,  -1.000000000f, 1.000000000f,  -0.707106769f,
+    0.707106769f,  -0.707106769f, 0.707106769f,  -0.382683456f, 0.382683456f,
+    -0.923879564f, 0.923879564f,  -0.923879564f, 0.923879564f,  -0.382683456f,
+    0.382683456f,  -0.195090324f, 0.195090324f,  -0.980785251f, 0.980785251f,
+    -0.831469595f, 0.831469595f,  -0.555570245f, 0.555570245f,  -0.555570245f,
+    0.555570245f,  -0.831469595f, 0.831469595f,  -0.980785251f, 0.980785251f,
+    -0.195090324f, 0.195090324f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk3i[32] = {
+    -0.000000000f, 0.000000000f,  -0.707106769f, 0.707106769f,  -0.923879564f,
+    0.923879564f,  0.382683456f,  -0.382683456f, -0.555570245f, 0.555570245f,
+    -0.195090353f, 0.195090353f,  -0.980785251f, 0.980785251f,  0.831469536f,
+    -0.831469536f, -0.290284693f, 0.290284693f,  -0.471396863f, 0.471396863f,
+    -0.995184720f, 0.995184720f,  0.634393334f,  -0.634393334f, -0.773010492f,
+    0.773010492f,  0.098017156f,  -0.098017156f, -0.881921172f, 0.881921172f,
+    0.956940353f,  -0.956940353f,
+};
+ALIGN16_BEG const float ALIGN16_END cftmdl_wk1r[4] = {
+    0.707106769f,
+    0.707106769f,
+    0.707106769f,
+    -0.707106769f,
+};
+#endif
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_UTILITY_OOURA_FFT_TABLES_NEON_SSE2_H_
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128_gn/moz.build b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128_gn/moz.build
new file mode 100644
index 0000000000..328c77410c
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128_gn/moz.build
@@ -0,0 +1,280 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "log"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    OS_LIBS += [
+        "rt"
+    ]
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    OS_LIBS += [
+        "crypt32",
+        "iphlpapi",
+        "secur32",
+        "winmm"
+    ]
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.cc"
+    ]
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.cc"
+    ]
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_mips.cc"
+    ]
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc"
+    ]
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.cc"
+    ]
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2",
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+if CONFIG["OS_TARGET"] == "Darwin" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2",
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+Library("fft_size_128_gn")
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256/fft4g.cc b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256/fft4g.cc
new file mode 100644
index 0000000000..2573f23dab
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256/fft4g.cc
@@ -0,0 +1,866 @@
+/*
+ * http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html
+ * Copyright Takuya OOURA, 1996-2001
+ *
+ * You may use, copy, modify and distribute this code for any purpose (include
+ * commercial use) and without fee. Please refer to this package when you modify
+ * this code.
+ *
+ * Changes:
+ * Trivial type modifications by the WebRTC authors.
+ */
+
+/*
+Fast Fourier/Cosine/Sine Transform
+    dimension   :one
+    data length :power of 2
+    decimation  :frequency
+    radix       :4, 2
+    data        :inplace
+    table       :use
+functions
+    cdft: Complex Discrete Fourier Transform
+    rdft: Real Discrete Fourier Transform
+    ddct: Discrete Cosine Transform
+    ddst: Discrete Sine Transform
+    dfct: Cosine Transform of RDFT (Real Symmetric DFT)
+    dfst: Sine Transform of RDFT (Real Anti-symmetric DFT)
+function prototypes
+    void cdft(int, int, float *, int *, float *);
+    void rdft(size_t, int, float *, size_t *, float *);
+    void ddct(int, int, float *, int *, float *);
+    void ddst(int, int, float *, int *, float *);
+    void dfct(int, float *, float *, int *, float *);
+    void dfst(int, float *, float *, int *, float *);
+
+
+-------- Complex DFT (Discrete Fourier Transform) --------
+    [definition]
+        <case1>
+            X[k] = sum_j=0^n-1 x[j]*exp(2*pi*i*j*k/n), 0<=k<n
+        <case2>
+            X[k] = sum_j=0^n-1 x[j]*exp(-2*pi*i*j*k/n), 0<=k<n
+        (notes: sum_j=0^n-1 is a summation from j=0 to n-1)
+    [usage]
+        <case1>
+            ip[0] = 0; // first time only
+            cdft(2*n, 1, a, ip, w);
+        <case2>
+            ip[0] = 0; // first time only
+            cdft(2*n, -1, a, ip, w);
+    [parameters]
+        2*n            :data length (int)
+                        n >= 1, n = power of 2
+        a[0...2*n-1]   :input/output data (float *)
+                        input data
+                            a[2*j] = Re(x[j]),
+                            a[2*j+1] = Im(x[j]), 0<=j<n
+                        output data
+                            a[2*k] = Re(X[k]),
+                            a[2*k+1] = Im(X[k]), 0<=k<n
+        ip[0...*]      :work area for bit reversal (int *)
+                        length of ip >= 2+sqrt(n)
+                        strictly,
+                        length of ip >=
+                            2+(1<<(int)(log(n+0.5)/log(2))/2).
+                        ip[0],ip[1] are pointers of the cos/sin table.
+        w[0...n/2-1]   :cos/sin table (float *)
+                        w[],ip[] are initialized if ip[0] == 0.
+    [remark]
+        Inverse of
+            cdft(2*n, -1, a, ip, w);
+        is
+            cdft(2*n, 1, a, ip, w);
+            for (j = 0; j <= 2 * n - 1; j++) {
+                a[j] *= 1.0 / n;
+            }
+        .
+
+
+-------- Real DFT / Inverse of Real DFT --------
+    [definition]
+        <case1> RDFT
+            R[k] = sum_j=0^n-1 a[j]*cos(2*pi*j*k/n), 0<=k<=n/2
+            I[k] = sum_j=0^n-1 a[j]*sin(2*pi*j*k/n), 0<k<n/2
+        <case2> IRDFT (excluding scale)
+            a[k] = (R[0] + R[n/2]*cos(pi*k))/2 +
+                   sum_j=1^n/2-1 R[j]*cos(2*pi*j*k/n) +
+                   sum_j=1^n/2-1 I[j]*sin(2*pi*j*k/n), 0<=k<n
+    [usage]
+        <case1>
+            ip[0] = 0; // first time only
+            rdft(n, 1, a, ip, w);
+        <case2>
+            ip[0] = 0; // first time only
+            rdft(n, -1, a, ip, w);
+    [parameters]
+        n              :data length (size_t)
+                        n >= 2, n = power of 2
+        a[0...n-1]     :input/output data (float *)
+                        <case1>
+                            output data
+                                a[2*k] = R[k], 0<=k<n/2
+                                a[2*k+1] = I[k], 0<k<n/2
+                                a[1] = R[n/2]
+                        <case2>
+                            input data
+                                a[2*j] = R[j], 0<=j<n/2
+                                a[2*j+1] = I[j], 0<j<n/2
+                                a[1] = R[n/2]
+        ip[0...*]      :work area for bit reversal (size_t *)
+                        length of ip >= 2+sqrt(n/2)
+                        strictly,
+                        length of ip >=
+                            2+(1<<(int)(log(n/2+0.5)/log(2))/2).
+                        ip[0],ip[1] are pointers of the cos/sin table.
+        w[0...n/2-1]   :cos/sin table (float *)
+                        w[],ip[] are initialized if ip[0] == 0.
+    [remark]
+        Inverse of
+            rdft(n, 1, a, ip, w);
+        is
+            rdft(n, -1, a, ip, w);
+            for (j = 0; j <= n - 1; j++) {
+                a[j] *= 2.0 / n;
+            }
+        .
+
+
+-------- DCT (Discrete Cosine Transform) / Inverse of DCT --------
+    [definition]
+        <case1> IDCT (excluding scale)
+            C[k] = sum_j=0^n-1 a[j]*cos(pi*j*(k+1/2)/n), 0<=k<n
+        <case2> DCT
+            C[k] = sum_j=0^n-1 a[j]*cos(pi*(j+1/2)*k/n), 0<=k<n
+    [usage]
+        <case1>
+            ip[0] = 0; // first time only
+            ddct(n, 1, a, ip, w);
+        <case2>
+            ip[0] = 0; // first time only
+            ddct(n, -1, a, ip, w);
+    [parameters]
+        n              :data length (int)
+                        n >= 2, n = power of 2
+        a[0...n-1]     :input/output data (float *)
+                        output data
+                            a[k] = C[k], 0<=k<n
+        ip[0...*]      :work area for bit reversal (int *)
+                        length of ip >= 2+sqrt(n/2)
+                        strictly,
+                        length of ip >=
+                            2+(1<<(int)(log(n/2+0.5)/log(2))/2).
+                        ip[0],ip[1] are pointers of the cos/sin table.
+        w[0...n*5/4-1] :cos/sin table (float *)
+                        w[],ip[] are initialized if ip[0] == 0.
+    [remark]
+        Inverse of
+            ddct(n, -1, a, ip, w);
+        is
+            a[0] *= 0.5;
+            ddct(n, 1, a, ip, w);
+            for (j = 0; j <= n - 1; j++) {
+                a[j] *= 2.0 / n;
+            }
+        .
+
+
+-------- DST (Discrete Sine Transform) / Inverse of DST --------
+    [definition]
+        <case1> IDST (excluding scale)
+            S[k] = sum_j=1^n A[j]*sin(pi*j*(k+1/2)/n), 0<=k<n
+        <case2> DST
+            S[k] = sum_j=0^n-1 a[j]*sin(pi*(j+1/2)*k/n), 0<k<=n
+    [usage]
+        <case1>
+            ip[0] = 0; // first time only
+            ddst(n, 1, a, ip, w);
+        <case2>
+            ip[0] = 0; // first time only
+            ddst(n, -1, a, ip, w);
+    [parameters]
+        n              :data length (int)
+                        n >= 2, n = power of 2
+        a[0...n-1]     :input/output data (float *)
+                        <case1>
+                            input data
+                                a[j] = A[j], 0<j<n
+                                a[0] = A[n]
+                            output data
+                                a[k] = S[k], 0<=k<n
+                        <case2>
+                            output data
+                                a[k] = S[k], 0<k<n
+                                a[0] = S[n]
+        ip[0...*]      :work area for bit reversal (int *)
+                        length of ip >= 2+sqrt(n/2)
+                        strictly,
+                        length of ip >=
+                            2+(1<<(int)(log(n/2+0.5)/log(2))/2).
+                        ip[0],ip[1] are pointers of the cos/sin table.
+        w[0...n*5/4-1] :cos/sin table (float *)
+                        w[],ip[] are initialized if ip[0] == 0.
+    [remark]
+        Inverse of
+            ddst(n, -1, a, ip, w);
+        is
+            a[0] *= 0.5;
+            ddst(n, 1, a, ip, w);
+            for (j = 0; j <= n - 1; j++) {
+                a[j] *= 2.0 / n;
+            }
+        .
+
+
+-------- Cosine Transform of RDFT (Real Symmetric DFT) --------
+    [definition]
+        C[k] = sum_j=0^n a[j]*cos(pi*j*k/n), 0<=k<=n
+    [usage]
+        ip[0] = 0; // first time only
+        dfct(n, a, t, ip, w);
+    [parameters]
+        n              :data length - 1 (int)
+                        n >= 2, n = power of 2
+        a[0...n]       :input/output data (float *)
+                        output data
+                            a[k] = C[k], 0<=k<=n
+        t[0...n/2]     :work area (float *)
+        ip[0...*]      :work area for bit reversal (int *)
+                        length of ip >= 2+sqrt(n/4)
+                        strictly,
+                        length of ip >=
+                            2+(1<<(int)(log(n/4+0.5)/log(2))/2).
+                        ip[0],ip[1] are pointers of the cos/sin table.
+        w[0...n*5/8-1] :cos/sin table (float *)
+                        w[],ip[] are initialized if ip[0] == 0.
+    [remark]
+        Inverse of
+            a[0] *= 0.5;
+            a[n] *= 0.5;
+            dfct(n, a, t, ip, w);
+        is
+            a[0] *= 0.5;
+            a[n] *= 0.5;
+            dfct(n, a, t, ip, w);
+            for (j = 0; j <= n; j++) {
+                a[j] *= 2.0 / n;
+            }
+        .
+
+
+-------- Sine Transform of RDFT (Real Anti-symmetric DFT) --------
+    [definition]
+        S[k] = sum_j=1^n-1 a[j]*sin(pi*j*k/n), 0<k<n
+    [usage]
+        ip[0] = 0; // first time only
+        dfst(n, a, t, ip, w);
+    [parameters]
+        n              :data length + 1 (int)
+                        n >= 2, n = power of 2
+        a[0...n-1]     :input/output data (float *)
+                        output data
+                            a[k] = S[k], 0<k<n
+                        (a[0] is used for work area)
+        t[0...n/2-1]   :work area (float *)
+        ip[0...*]      :work area for bit reversal (int *)
+                        length of ip >= 2+sqrt(n/4)
+                        strictly,
+                        length of ip >=
+                            2+(1<<(int)(log(n/4+0.5)/log(2))/2).
+                        ip[0],ip[1] are pointers of the cos/sin table.
+        w[0...n*5/8-1] :cos/sin table (float *)
+                        w[],ip[] are initialized if ip[0] == 0.
+    [remark]
+        Inverse of
+            dfst(n, a, t, ip, w);
+        is
+            dfst(n, a, t, ip, w);
+            for (j = 1; j <= n - 1; j++) {
+                a[j] *= 2.0 / n;
+            }
+        .
+
+
+Appendix :
+    The cos/sin table is recalculated when the larger table required.
+    w[] and ip[] are compatible with all routines.
+*/
+
+#include "common_audio/third_party/ooura/fft_size_256/fft4g.h"
+
+#include <math.h>
+#include <stddef.h>
+
+namespace webrtc {
+
+namespace {
+
+void makewt(size_t nw, size_t* ip, float* w);
+void makect(size_t nc, size_t* ip, float* c);
+void bitrv2(size_t n, size_t* ip, float* a);
+void cftfsub(size_t n, float* a, float* w);
+void cftbsub(size_t n, float* a, float* w);
+void cft1st(size_t n, float* a, float* w);
+void cftmdl(size_t n, size_t l, float* a, float* w);
+void rftfsub(size_t n, float* a, size_t nc, float* c);
+void rftbsub(size_t n, float* a, size_t nc, float* c);
+
+/* -------- initializing routines -------- */
+
+void makewt(size_t nw, size_t* ip, float* w) {
+  size_t j, nwh;
+  float delta, x, y;
+
+  ip[0] = nw;
+  ip[1] = 1;
+  if (nw > 2) {
+    nwh = nw >> 1;
+    delta = atanf(1.0f) / nwh;
+    w[0] = 1;
+    w[1] = 0;
+    w[nwh] = (float)cos(delta * nwh);
+    w[nwh + 1] = w[nwh];
+    if (nwh > 2) {
+      for (j = 2; j < nwh; j += 2) {
+        x = (float)cos(delta * j);
+        y = (float)sin(delta * j);
+        w[j] = x;
+        w[j + 1] = y;
+        w[nw - j] = y;
+        w[nw - j + 1] = x;
+      }
+      bitrv2(nw, ip + 2, w);
+    }
+  }
+}
+
+void makect(size_t nc, size_t* ip, float* c) {
+  size_t j, nch;
+  float delta;
+
+  ip[1] = nc;
+  if (nc > 1) {
+    nch = nc >> 1;
+    delta = atanf(1.0f) / nch;
+    c[0] = (float)cos(delta * nch);
+    c[nch] = 0.5f * c[0];
+    for (j = 1; j < nch; j++) {
+      c[j] = 0.5f * (float)cos(delta * j);
+      c[nc - j] = 0.5f * (float)sin(delta * j);
+    }
+  }
+}
+
+/* -------- child routines -------- */
+
+void bitrv2(size_t n, size_t* ip, float* a) {
+  size_t j, j1, k, k1, l, m, m2;
+  float xr, xi, yr, yi;
+
+  ip[0] = 0;
+  l = n;
+  m = 1;
+  while ((m << 3) < l) {
+    l >>= 1;
+    for (j = 0; j < m; j++) {
+      ip[m + j] = ip[j] + l;
+    }
+    m <<= 1;
+  }
+  m2 = 2 * m;
+  if ((m << 3) == l) {
+    for (k = 0; k < m; k++) {
+      for (j = 0; j < k; j++) {
+        j1 = 2 * j + ip[k];
+        k1 = 2 * k + ip[j];
+        xr = a[j1];
+        xi = a[j1 + 1];
+        yr = a[k1];
+        yi = a[k1 + 1];
+        a[j1] = yr;
+        a[j1 + 1] = yi;
+        a[k1] = xr;
+        a[k1 + 1] = xi;
+        j1 += m2;
+        k1 += 2 * m2;
+        xr = a[j1];
+        xi = a[j1 + 1];
+        yr = a[k1];
+        yi = a[k1 + 1];
+        a[j1] = yr;
+        a[j1 + 1] = yi;
+        a[k1] = xr;
+        a[k1 + 1] = xi;
+        j1 += m2;
+        k1 -= m2;
+        xr = a[j1];
+        xi = a[j1 + 1];
+        yr = a[k1];
+        yi = a[k1 + 1];
+        a[j1] = yr;
+        a[j1 + 1] = yi;
+        a[k1] = xr;
+        a[k1 + 1] = xi;
+        j1 += m2;
+        k1 += 2 * m2;
+        xr = a[j1];
+        xi = a[j1 + 1];
+        yr = a[k1];
+        yi = a[k1 + 1];
+        a[j1] = yr;
+        a[j1 + 1] = yi;
+        a[k1] = xr;
+        a[k1 + 1] = xi;
+      }
+      j1 = 2 * k + m2 + ip[k];
+      k1 = j1 + m2;
+      xr = a[j1];
+      xi = a[j1 + 1];
+      yr = a[k1];
+      yi = a[k1 + 1];
+      a[j1] = yr;
+      a[j1 + 1] = yi;
+      a[k1] = xr;
+      a[k1 + 1] = xi;
+    }
+  } else {
+    for (k = 1; k < m; k++) {
+      for (j = 0; j < k; j++) {
+        j1 = 2 * j + ip[k];
+        k1 = 2 * k + ip[j];
+        xr = a[j1];
+        xi = a[j1 + 1];
+        yr = a[k1];
+        yi = a[k1 + 1];
+        a[j1] = yr;
+        a[j1 + 1] = yi;
+        a[k1] = xr;
+        a[k1 + 1] = xi;
+        j1 += m2;
+        k1 += m2;
+        xr = a[j1];
+        xi = a[j1 + 1];
+        yr = a[k1];
+        yi = a[k1 + 1];
+        a[j1] = yr;
+        a[j1 + 1] = yi;
+        a[k1] = xr;
+        a[k1 + 1] = xi;
+      }
+    }
+  }
+}
+
+void cftfsub(size_t n, float* a, float* w) {
+  size_t j, j1, j2, j3, l;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  l = 2;
+  if (n > 8) {
+    cft1st(n, a, w);
+    l = 8;
+    while ((l << 2) < n) {
+      cftmdl(n, l, a, w);
+      l <<= 2;
+    }
+  }
+  if ((l << 2) == n) {
+    for (j = 0; j < l; j += 2) {
+      j1 = j + l;
+      j2 = j1 + l;
+      j3 = j2 + l;
+      x0r = a[j] + a[j1];
+      x0i = a[j + 1] + a[j1 + 1];
+      x1r = a[j] - a[j1];
+      x1i = a[j + 1] - a[j1 + 1];
+      x2r = a[j2] + a[j3];
+      x2i = a[j2 + 1] + a[j3 + 1];
+      x3r = a[j2] - a[j3];
+      x3i = a[j2 + 1] - a[j3 + 1];
+      a[j] = x0r + x2r;
+      a[j + 1] = x0i + x2i;
+      a[j2] = x0r - x2r;
+      a[j2 + 1] = x0i - x2i;
+      a[j1] = x1r - x3i;
+      a[j1 + 1] = x1i + x3r;
+      a[j3] = x1r + x3i;
+      a[j3 + 1] = x1i - x3r;
+    }
+  } else {
+    for (j = 0; j < l; j += 2) {
+      j1 = j + l;
+      x0r = a[j] - a[j1];
+      x0i = a[j + 1] - a[j1 + 1];
+      a[j] += a[j1];
+      a[j + 1] += a[j1 + 1];
+      a[j1] = x0r;
+      a[j1 + 1] = x0i;
+    }
+  }
+}
+
+void cftbsub(size_t n, float* a, float* w) {
+  size_t j, j1, j2, j3, l;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  l = 2;
+  if (n > 8) {
+    cft1st(n, a, w);
+    l = 8;
+    while ((l << 2) < n) {
+      cftmdl(n, l, a, w);
+      l <<= 2;
+    }
+  }
+  if ((l << 2) == n) {
+    for (j = 0; j < l; j += 2) {
+      j1 = j + l;
+      j2 = j1 + l;
+      j3 = j2 + l;
+      x0r = a[j] + a[j1];
+      x0i = -a[j + 1] - a[j1 + 1];
+      x1r = a[j] - a[j1];
+      x1i = -a[j + 1] + a[j1 + 1];
+      x2r = a[j2] + a[j3];
+      x2i = a[j2 + 1] + a[j3 + 1];
+      x3r = a[j2] - a[j3];
+      x3i = a[j2 + 1] - a[j3 + 1];
+      a[j] = x0r + x2r;
+      a[j + 1] = x0i - x2i;
+      a[j2] = x0r - x2r;
+      a[j2 + 1] = x0i + x2i;
+      a[j1] = x1r - x3i;
+      a[j1 + 1] = x1i - x3r;
+      a[j3] = x1r + x3i;
+      a[j3 + 1] = x1i + x3r;
+    }
+  } else {
+    for (j = 0; j < l; j += 2) {
+      j1 = j + l;
+      x0r = a[j] - a[j1];
+      x0i = -a[j + 1] + a[j1 + 1];
+      a[j] += a[j1];
+      a[j + 1] = -a[j + 1] - a[j1 + 1];
+      a[j1] = x0r;
+      a[j1 + 1] = x0i;
+    }
+  }
+}
+
+void cft1st(size_t n, float* a, float* w) {
+  size_t j, k1, k2;
+  float wk1r, wk1i, wk2r, wk2i, wk3r, wk3i;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  x0r = a[0] + a[2];
+  x0i = a[1] + a[3];
+  x1r = a[0] - a[2];
+  x1i = a[1] - a[3];
+  x2r = a[4] + a[6];
+  x2i = a[5] + a[7];
+  x3r = a[4] - a[6];
+  x3i = a[5] - a[7];
+  a[0] = x0r + x2r;
+  a[1] = x0i + x2i;
+  a[4] = x0r - x2r;
+  a[5] = x0i - x2i;
+  a[2] = x1r - x3i;
+  a[3] = x1i + x3r;
+  a[6] = x1r + x3i;
+  a[7] = x1i - x3r;
+  wk1r = w[2];
+  x0r = a[8] + a[10];
+  x0i = a[9] + a[11];
+  x1r = a[8] - a[10];
+  x1i = a[9] - a[11];
+  x2r = a[12] + a[14];
+  x2i = a[13] + a[15];
+  x3r = a[12] - a[14];
+  x3i = a[13] - a[15];
+  a[8] = x0r + x2r;
+  a[9] = x0i + x2i;
+  a[12] = x2i - x0i;
+  a[13] = x0r - x2r;
+  x0r = x1r - x3i;
+  x0i = x1i + x3r;
+  a[10] = wk1r * (x0r - x0i);
+  a[11] = wk1r * (x0r + x0i);
+  x0r = x3i + x1r;
+  x0i = x3r - x1i;
+  a[14] = wk1r * (x0i - x0r);
+  a[15] = wk1r * (x0i + x0r);
+  k1 = 0;
+  for (j = 16; j < n; j += 16) {
+    k1 += 2;
+    k2 = 2 * k1;
+    wk2r = w[k1];
+    wk2i = w[k1 + 1];
+    wk1r = w[k2];
+    wk1i = w[k2 + 1];
+    wk3r = wk1r - 2 * wk2i * wk1i;
+    wk3i = 2 * wk2i * wk1r - wk1i;
+    x0r = a[j] + a[j + 2];
+    x0i = a[j + 1] + a[j + 3];
+    x1r = a[j] - a[j + 2];
+    x1i = a[j + 1] - a[j + 3];
+    x2r = a[j + 4] + a[j + 6];
+    x2i = a[j + 5] + a[j + 7];
+    x3r = a[j + 4] - a[j + 6];
+    x3i = a[j + 5] - a[j + 7];
+    a[j] = x0r + x2r;
+    a[j + 1] = x0i + x2i;
+    x0r -= x2r;
+    x0i -= x2i;
+    a[j + 4] = wk2r * x0r - wk2i * x0i;
+    a[j + 5] = wk2r * x0i + wk2i * x0r;
+    x0r = x1r - x3i;
+    x0i = x1i + x3r;
+    a[j + 2] = wk1r * x0r - wk1i * x0i;
+    a[j + 3] = wk1r * x0i + wk1i * x0r;
+    x0r = x1r + x3i;
+    x0i = x1i - x3r;
+    a[j + 6] = wk3r * x0r - wk3i * x0i;
+    a[j + 7] = wk3r * x0i + wk3i * x0r;
+    wk1r = w[k2 + 2];
+    wk1i = w[k2 + 3];
+    wk3r = wk1r - 2 * wk2r * wk1i;
+    wk3i = 2 * wk2r * wk1r - wk1i;
+    x0r = a[j + 8] + a[j + 10];
+    x0i = a[j + 9] + a[j + 11];
+    x1r = a[j + 8] - a[j + 10];
+    x1i = a[j + 9] - a[j + 11];
+    x2r = a[j + 12] + a[j + 14];
+    x2i = a[j + 13] + a[j + 15];
+    x3r = a[j + 12] - a[j + 14];
+    x3i = a[j + 13] - a[j + 15];
+    a[j + 8] = x0r + x2r;
+    a[j + 9] = x0i + x2i;
+    x0r -= x2r;
+    x0i -= x2i;
+    a[j + 12] = -wk2i * x0r - wk2r * x0i;
+    a[j + 13] = -wk2i * x0i + wk2r * x0r;
+    x0r = x1r - x3i;
+    x0i = x1i + x3r;
+    a[j + 10] = wk1r * x0r - wk1i * x0i;
+    a[j + 11] = wk1r * x0i + wk1i * x0r;
+    x0r = x1r + x3i;
+    x0i = x1i - x3r;
+    a[j + 14] = wk3r * x0r - wk3i * x0i;
+    a[j + 15] = wk3r * x0i + wk3i * x0r;
+  }
+}
+
+void cftmdl(size_t n, size_t l, float* a, float* w) {
+  size_t j, j1, j2, j3, k, k1, k2, m, m2;
+  float wk1r, wk1i, wk2r, wk2i, wk3r, wk3i;
+  float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
+
+  m = l << 2;
+  for (j = 0; j < l; j += 2) {
+    j1 = j + l;
+    j2 = j1 + l;
+    j3 = j2 + l;
+    x0r = a[j] + a[j1];
+    x0i = a[j + 1] + a[j1 + 1];
+    x1r = a[j] - a[j1];
+    x1i = a[j + 1] - a[j1 + 1];
+    x2r = a[j2] + a[j3];
+    x2i = a[j2 + 1] + a[j3 + 1];
+    x3r = a[j2] - a[j3];
+    x3i = a[j2 + 1] - a[j3 + 1];
+    a[j] = x0r + x2r;
+    a[j + 1] = x0i + x2i;
+    a[j2] = x0r - x2r;
+    a[j2 + 1] = x0i - x2i;
+    a[j1] = x1r - x3i;
+    a[j1 + 1] = x1i + x3r;
+    a[j3] = x1r + x3i;
+    a[j3 + 1] = x1i - x3r;
+  }
+  wk1r = w[2];
+  for (j = m; j < l + m; j += 2) {
+    j1 = j + l;
+    j2 = j1 + l;
+    j3 = j2 + l;
+    x0r = a[j] + a[j1];
+    x0i = a[j + 1] + a[j1 + 1];
+    x1r = a[j] - a[j1];
+    x1i = a[j + 1] - a[j1 + 1];
+    x2r = a[j2] + a[j3];
+    x2i = a[j2 + 1] + a[j3 + 1];
+    x3r = a[j2] - a[j3];
+    x3i = a[j2 + 1] - a[j3 + 1];
+    a[j] = x0r + x2r;
+    a[j + 1] = x0i + x2i;
+    a[j2] = x2i - x0i;
+    a[j2 + 1] = x0r - x2r;
+    x0r = x1r - x3i;
+    x0i = x1i + x3r;
+    a[j1] = wk1r * (x0r - x0i);
+    a[j1 + 1] = wk1r * (x0r + x0i);
+    x0r = x3i + x1r;
+    x0i = x3r - x1i;
+    a[j3] = wk1r * (x0i - x0r);
+    a[j3 + 1] = wk1r * (x0i + x0r);
+  }
+  k1 = 0;
+  m2 = 2 * m;
+  for (k = m2; k < n; k += m2) {
+    k1 += 2;
+    k2 = 2 * k1;
+    wk2r = w[k1];
+    wk2i = w[k1 + 1];
+    wk1r = w[k2];
+    wk1i = w[k2 + 1];
+    wk3r = wk1r - 2 * wk2i * wk1i;
+    wk3i = 2 * wk2i * wk1r - wk1i;
+    for (j = k; j < l + k; j += 2) {
+      j1 = j + l;
+      j2 = j1 + l;
+      j3 = j2 + l;
+      x0r = a[j] + a[j1];
+      x0i = a[j + 1] + a[j1 + 1];
+      x1r = a[j] - a[j1];
+      x1i = a[j + 1] - a[j1 + 1];
+      x2r = a[j2] + a[j3];
+      x2i = a[j2 + 1] + a[j3 + 1];
+      x3r = a[j2] - a[j3];
+      x3i = a[j2 + 1] - a[j3 + 1];
+      a[j] = x0r + x2r;
+      a[j + 1] = x0i + x2i;
+      x0r -= x2r;
+      x0i -= x2i;
+      a[j2] = wk2r * x0r - wk2i * x0i;
+      a[j2 + 1] = wk2r * x0i + wk2i * x0r;
+      x0r = x1r - x3i;
+      x0i = x1i + x3r;
+      a[j1] = wk1r * x0r - wk1i * x0i;
+      a[j1 + 1] = wk1r * x0i + wk1i * x0r;
+      x0r = x1r + x3i;
+      x0i = x1i - x3r;
+      a[j3] = wk3r * x0r - wk3i * x0i;
+      a[j3 + 1] = wk3r * x0i + wk3i * x0r;
+    }
+    wk1r = w[k2 + 2];
+    wk1i = w[k2 + 3];
+    wk3r = wk1r - 2 * wk2r * wk1i;
+    wk3i = 2 * wk2r * wk1r - wk1i;
+    for (j = k + m; j < l + (k + m); j += 2) {
+      j1 = j + l;
+      j2 = j1 + l;
+      j3 = j2 + l;
+      x0r = a[j] + a[j1];
+      x0i = a[j + 1] + a[j1 + 1];
+      x1r = a[j] - a[j1];
+      x1i = a[j + 1] - a[j1 + 1];
+      x2r = a[j2] + a[j3];
+      x2i = a[j2 + 1] + a[j3 + 1];
+      x3r = a[j2] - a[j3];
+      x3i = a[j2 + 1] - a[j3 + 1];
+      a[j] = x0r + x2r;
+      a[j + 1] = x0i + x2i;
+      x0r -= x2r;
+      x0i -= x2i;
+      a[j2] = -wk2i * x0r - wk2r * x0i;
+      a[j2 + 1] = -wk2i * x0i + wk2r * x0r;
+      x0r = x1r - x3i;
+      x0i = x1i + x3r;
+      a[j1] = wk1r * x0r - wk1i * x0i;
+      a[j1 + 1] = wk1r * x0i + wk1i * x0r;
+      x0r = x1r + x3i;
+      x0i = x1i - x3r;
+      a[j3] = wk3r * x0r - wk3i * x0i;
+      a[j3 + 1] = wk3r * x0i + wk3i * x0r;
+    }
+  }
+}
+
+void rftfsub(size_t n, float* a, size_t nc, float* c) {
+  size_t j, k, kk, ks, m;
+  float wkr, wki, xr, xi, yr, yi;
+
+  m = n >> 1;
+  ks = 2 * nc / m;
+  kk = 0;
+  for (j = 2; j < m; j += 2) {
+    k = n - j;
+    kk += ks;
+    wkr = 0.5f - c[nc - kk];
+    wki = c[kk];
+    xr = a[j] - a[k];
+    xi = a[j + 1] + a[k + 1];
+    yr = wkr * xr - wki * xi;
+    yi = wkr * xi + wki * xr;
+    a[j] -= yr;
+    a[j + 1] -= yi;
+    a[k] += yr;
+    a[k + 1] -= yi;
+  }
+}
+
+void rftbsub(size_t n, float* a, size_t nc, float* c) {
+  size_t j, k, kk, ks, m;
+  float wkr, wki, xr, xi, yr, yi;
+
+  a[1] = -a[1];
+  m = n >> 1;
+  ks = 2 * nc / m;
+  kk = 0;
+  for (j = 2; j < m; j += 2) {
+    k = n - j;
+    kk += ks;
+    wkr = 0.5f - c[nc - kk];
+    wki = c[kk];
+    xr = a[j] - a[k];
+    xi = a[j + 1] + a[k + 1];
+    yr = wkr * xr + wki * xi;
+    yi = wkr * xi - wki * xr;
+    a[j] -= yr;
+    a[j + 1] = yi - a[j + 1];
+    a[k] += yr;
+    a[k + 1] = yi - a[k + 1];
+  }
+  a[m + 1] = -a[m + 1];
+}
+
+}  // namespace
+
+void WebRtc_rdft(size_t n, int isgn, float* a, size_t* ip, float* w) {
+  size_t nw, nc;
+  float xi;
+
+  nw = ip[0];
+  if (n > (nw << 2)) {
+    nw = n >> 2;
+    makewt(nw, ip, w);
+  }
+  nc = ip[1];
+  if (n > (nc << 2)) {
+    nc = n >> 2;
+    makect(nc, ip, w + nw);
+  }
+  if (isgn >= 0) {
+    if (n > 4) {
+      bitrv2(n, ip + 2, a);
+      cftfsub(n, a, w);
+      rftfsub(n, a, nc, w + nw);
+    } else if (n == 4) {
+      cftfsub(n, a, w);
+    }
+    xi = a[0] - a[1];
+    a[0] += a[1];
+    a[1] = xi;
+  } else {
+    a[1] = 0.5f * (a[0] - a[1]);
+    a[0] -= a[1];
+    if (n > 4) {
+      rftbsub(n, a, nc, w + nw);
+      bitrv2(n, ip + 2, a);
+      cftbsub(n, a, w);
+    } else if (n == 4) {
+      cftfsub(n, a, w);
+    }
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256/fft4g.h b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256/fft4g.h
new file mode 100644
index 0000000000..5a465a3545
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256/fft4g.h
@@ -0,0 +1,23 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the ../../../LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_THIRD_PARTY_OOURA_FFT_SIZE_256_FFT4G_H_
+#define COMMON_AUDIO_THIRD_PARTY_OOURA_FFT_SIZE_256_FFT4G_H_
+
+#include <stddef.h>
+
+namespace webrtc {
+
+// Refer to fft4g.c for documentation.
+void WebRtc_rdft(size_t n, int isgn, float* a, size_t* ip, float* w);
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_THIRD_PARTY_OOURA_FFT_SIZE_256_FFT4G_H_
diff --git a/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256_gn/moz.build b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256_gn/moz.build
new file mode 100644
index 0000000000..e65c7c572f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256_gn/moz.build
@@ -0,0 +1,221 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+UNIFIED_SOURCES += [
+    "/third_party/libwebrtc/common_audio/third_party/ooura/fft_size_256/fft4g.cc"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    CXXFLAGS += [
+        "-mfpu=neon"
+    ]
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CXXFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+Library("fft_size_256_gn")
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/BUILD.gn b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/BUILD.gn
new file mode 100644
index 0000000000..e66ed2796e
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/BUILD.gn
@@ -0,0 +1,24 @@
+# Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the ../../../LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+import("../../../webrtc.gni")
+
+rtc_library("spl_sqrt_floor") {
+  visibility = [ "../..:common_audio_c" ]
+  sources = [ "spl_sqrt_floor.h" ]
+  deps = []
+  if (target_cpu == "arm") {
+    sources += [ "spl_sqrt_floor_arm.S" ]
+
+    deps += [ "../../../rtc_base/system:asm_defines" ]
+  } else if (target_cpu == "mipsel") {
+    sources += [ "spl_sqrt_floor_mips.c" ]
+  } else {
+    sources += [ "spl_sqrt_floor.c" ]
+  }
+}
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/LICENSE b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/LICENSE
new file mode 100644
index 0000000000..fdf17a2041
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/LICENSE
@@ -0,0 +1,27 @@
+/*
+ * Written by Wilco Dijkstra, 1996. The following email exchange establishes the
+ * license.
+ *
+ * From: Wilco Dijkstra <Wilco.Dijkstra@ntlworld.com>
+ * Date: Fri, Jun 24, 2011 at 3:20 AM
+ * Subject: Re: sqrt routine
+ * To: Kevin Ma <kma@google.com>
+ * Hi Kevin,
+ * Thanks for asking. Those routines are public domain (originally posted to
+ * comp.sys.arm a long time ago), so you can use them freely for any purpose.
+ * Cheers,
+ * Wilco
+ *
+ * ----- Original Message -----
+ * From: "Kevin Ma" <kma@google.com>
+ * To: <Wilco.Dijkstra@ntlworld.com>
+ * Sent: Thursday, June 23, 2011 11:44 PM
+ * Subject: Fwd: sqrt routine
+ * Hi Wilco,
+ * I saw your sqrt routine from several web sites, including
+ * http://www.finesse.demon.co.uk/steven/sqrt.html.
+ * Just wonder if there's any copyright information with your Successive
+ * approximation routines, or if I can freely use it for any purpose.
+ * Thanks.
+ * Kevin
+ */
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/README.chromium b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/README.chromium
new file mode 100644
index 0000000000..b2c4309bd6
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/README.chromium
@@ -0,0 +1,13 @@
+Name: sql sqrt floor
+Short Name: sql_sqrt_floor
+URL: http://www.pertinentdetail.org/sqrt
+Version: 0
+Date: 2018-03-22
+License: Custom license
+License File: LICENSE
+Security Critical: yes
+Shipped: yes
+
+Description:
+Sqrt routine, originally was posted to the USENET group comp.sys.arm on
+20 Jun 1996.
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c
new file mode 100644
index 0000000000..b478a41b96
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c
@@ -0,0 +1,77 @@
+/*
+ * Written by Wilco Dijkstra, 1996. The following email exchange establishes the
+ * license.
+ *
+ * From: Wilco Dijkstra <Wilco.Dijkstra@ntlworld.com>
+ * Date: Fri, Jun 24, 2011 at 3:20 AM
+ * Subject: Re: sqrt routine
+ * To: Kevin Ma <kma@google.com>
+ * Hi Kevin,
+ * Thanks for asking. Those routines are public domain (originally posted to
+ * comp.sys.arm a long time ago), so you can use them freely for any purpose.
+ * Cheers,
+ * Wilco
+ *
+ * ----- Original Message -----
+ * From: "Kevin Ma" <kma@google.com>
+ * To: <Wilco.Dijkstra@ntlworld.com>
+ * Sent: Thursday, June 23, 2011 11:44 PM
+ * Subject: Fwd: sqrt routine
+ * Hi Wilco,
+ * I saw your sqrt routine from several web sites, including
+ * http://www.finesse.demon.co.uk/steven/sqrt.html.
+ * Just wonder if there's any copyright information with your Successive
+ * approximation routines, or if I can freely use it for any purpose.
+ * Thanks.
+ * Kevin
+ */
+
+// Minor modifications in code style for WebRTC, 2012.
+
+#include "common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.h"
+
+/*
+ * Algorithm:
+ * Successive approximation of the equation (root + delta) ^ 2 = N
+ * until delta < 1. If delta < 1 we have the integer part of SQRT (N).
+ * Use delta = 2^i for i = 15 .. 0.
+ *
+ * Output precision is 16 bits. Note for large input values (close to
+ * 0x7FFFFFFF), bit 15 (the highest bit of the low 16-bit half word)
+ * contains the MSB information (a non-sign value). Do with caution
+ * if you need to cast the output to int16_t type.
+ *
+ * If the input value is negative, it returns 0.
+ */
+
+#define WEBRTC_SPL_SQRT_ITER(N)                 \
+  try1 = root + (1 << (N));                     \
+  if (value >= try1 << (N))                     \
+  {                                             \
+    value -= try1 << (N);                       \
+    root |= 2 << (N);                           \
+  }
+
+int32_t WebRtcSpl_SqrtFloor(int32_t value)
+{
+  int32_t root = 0, try1;
+
+  WEBRTC_SPL_SQRT_ITER (15);
+  WEBRTC_SPL_SQRT_ITER (14);
+  WEBRTC_SPL_SQRT_ITER (13);
+  WEBRTC_SPL_SQRT_ITER (12);
+  WEBRTC_SPL_SQRT_ITER (11);
+  WEBRTC_SPL_SQRT_ITER (10);
+  WEBRTC_SPL_SQRT_ITER ( 9);
+  WEBRTC_SPL_SQRT_ITER ( 8);
+  WEBRTC_SPL_SQRT_ITER ( 7);
+  WEBRTC_SPL_SQRT_ITER ( 6);
+  WEBRTC_SPL_SQRT_ITER ( 5);
+  WEBRTC_SPL_SQRT_ITER ( 4);
+  WEBRTC_SPL_SQRT_ITER ( 3);
+  WEBRTC_SPL_SQRT_ITER ( 2);
+  WEBRTC_SPL_SQRT_ITER ( 1);
+  WEBRTC_SPL_SQRT_ITER ( 0);
+
+  return root >> 1;
+}
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.h b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.h
new file mode 100644
index 0000000000..718a18ff7d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.h
@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdint.h>
+
+//
+// WebRtcSpl_SqrtFloor(...)
+//
+// Returns the square root of the input value `value`. The precision of this
+// function is rounding down integer precision, i.e., sqrt(8) gives 2 as answer.
+// If `value` is a negative number then 0 is returned.
+//
+// Algorithm:
+//
+// An iterative 4 cylce/bit routine
+//
+// Input:
+//      - value     : Value to calculate sqrt of
+//
+// Return value     : Result of the sqrt calculation
+//
+int32_t WebRtcSpl_SqrtFloor(int32_t value);
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_arm.S b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_arm.S
new file mode 100644
index 0000000000..228e68e6ca
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_arm.S
@@ -0,0 +1,110 @@
+@
+@ Written by Wilco Dijkstra, 1996. The following email exchange establishes the
+@ license.
+@
+@ From: Wilco Dijkstra <Wilco.Dijkstra@ntlworld.com>
+@ Date: Fri, Jun 24, 2011 at 3:20 AM
+@ Subject: Re: sqrt routine
+@ To: Kevin Ma <kma@google.com>
+@ Hi Kevin,
+@ Thanks for asking. Those routines are public domain (originally posted to
+@ comp.sys.arm a long time ago), so you can use them freely for any purpose.
+@ Cheers,
+@ Wilco
+@
+@ ----- Original Message -----
+@ From: "Kevin Ma" <kma@google.com>
+@ To: <Wilco.Dijkstra@ntlworld.com>
+@ Sent: Thursday, June 23, 2011 11:44 PM
+@ Subject: Fwd: sqrt routine
+@ Hi Wilco,
+@ I saw your sqrt routine from several web sites, including
+@ http://www.finesse.demon.co.uk/steven/sqrt.html.
+@ Just wonder if there's any copyright information with your Successive
+@ approximation routines, or if I can freely use it for any purpose.
+@ Thanks.
+@ Kevin
+
+@ Minor modifications in code style for WebRTC, 2012.
+@ Output is bit-exact with the reference C code in spl_sqrt_floor.c.
+
+@ Input :             r0 32 bit unsigned integer
+@ Output:             r0 = INT (SQRT (r0)), precision is 16 bits
+@ Registers touched:  r1, r2
+
+#include "rtc_base/system/asm_defines.h"
+
+GLOBAL_FUNCTION WebRtcSpl_SqrtFloor
+.align  2
+DEFINE_FUNCTION WebRtcSpl_SqrtFloor
+  mov    r1, #3 << 30
+  mov    r2, #1 << 30
+
+  @ unroll for i = 0 .. 15
+
+  cmp    r0, r2, ror #2 * 0
+  subhs  r0, r0, r2, ror #2 * 0
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 1
+  subhs  r0, r0, r2, ror #2 * 1
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 2
+  subhs  r0, r0, r2, ror #2 * 2
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 3
+  subhs  r0, r0, r2, ror #2 * 3
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 4
+  subhs  r0, r0, r2, ror #2 * 4
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 5
+  subhs  r0, r0, r2, ror #2 * 5
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 6
+  subhs  r0, r0, r2, ror #2 * 6
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 7
+  subhs  r0, r0, r2, ror #2 * 7
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 8
+  subhs  r0, r0, r2, ror #2 * 8
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 9
+  subhs  r0, r0, r2, ror #2 * 9
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 10
+  subhs  r0, r0, r2, ror #2 * 10
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 11
+  subhs  r0, r0, r2, ror #2 * 11
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 12
+  subhs  r0, r0, r2, ror #2 * 12
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 13
+  subhs  r0, r0, r2, ror #2 * 13
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 14
+  subhs  r0, r0, r2, ror #2 * 14
+  adc    r2, r1, r2, lsl #1
+
+  cmp    r0, r2, ror #2 * 15
+  subhs  r0, r0, r2, ror #2 * 15
+  adc    r2, r1, r2, lsl #1
+
+  bic    r0, r2, #3 << 30  @ for rounding add: cmp r0, r2  adc r2, #1
+  bx lr
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_gn/moz.build b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_gn/moz.build
new file mode 100644
index 0000000000..618af60da3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_gn/moz.build
@@ -0,0 +1,277 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+  ### This moz.build was AUTOMATICALLY GENERATED from a GN config,  ###
+  ### DO NOT edit it by hand.                                       ###
+
+COMPILE_FLAGS["OS_INCLUDES"] = []
+AllowCompilerWarnings()
+
+DEFINES["ABSL_ALLOCATOR_NOTHROW"] = "1"
+DEFINES["RTC_DAV1D_IN_INTERNAL_DECODER_FACTORY"] = True
+DEFINES["RTC_ENABLE_VP9"] = True
+DEFINES["WEBRTC_ENABLE_PROTOBUF"] = "0"
+DEFINES["WEBRTC_LIBRARY_IMPL"] = True
+DEFINES["WEBRTC_MOZILLA_BUILD"] = True
+DEFINES["WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS"] = "0"
+DEFINES["WEBRTC_STRICT_FIELD_TRIALS"] = "0"
+
+FINAL_LIBRARY = "webrtc"
+
+
+LOCAL_INCLUDES += [
+    "!/ipc/ipdl/_ipdlheaders",
+    "!/third_party/libwebrtc/gen",
+    "/ipc/chromium/src",
+    "/third_party/libwebrtc/",
+    "/third_party/libwebrtc/third_party/abseil-cpp/",
+    "/tools/profiler/public"
+]
+
+if not CONFIG["MOZ_DEBUG"]:
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "0"
+    DEFINES["NDEBUG"] = True
+    DEFINES["NVALGRIND"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1":
+
+    DEFINES["DYNAMIC_ANNOTATIONS_ENABLED"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["ANDROID"] = True
+    DEFINES["ANDROID_NDK_VERSION_ROLL"] = "r22_1"
+    DEFINES["HAVE_SYS_UIO_H"] = True
+    DEFINES["WEBRTC_ANDROID"] = True
+    DEFINES["WEBRTC_ANDROID_OPENSLES"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_GNU_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["WEBRTC_MAC"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_LIBCPP_HAS_NO_ALIGNED_ALLOCATION"] = True
+    DEFINES["__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES"] = "0"
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_NSS_CERTS"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_UDEV"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_LINUX"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+if CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["USE_GLIB"] = "1"
+    DEFINES["USE_OZONE"] = "1"
+    DEFINES["USE_X11"] = "1"
+    DEFINES["WEBRTC_BSD"] = True
+    DEFINES["WEBRTC_ENABLE_LIBEVENT"] = True
+    DEFINES["WEBRTC_POSIX"] = True
+    DEFINES["_FILE_OFFSET_BITS"] = "64"
+    DEFINES["_LARGEFILE64_SOURCE"] = True
+    DEFINES["_LARGEFILE_SOURCE"] = True
+    DEFINES["__STDC_CONSTANT_MACROS"] = True
+    DEFINES["__STDC_FORMAT_MACROS"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["CERT_CHAIN_PARA_HAS_EXTRA_FIELDS"] = True
+    DEFINES["NOMINMAX"] = True
+    DEFINES["NTDDI_VERSION"] = "0x0A000000"
+    DEFINES["PSAPI_VERSION"] = "2"
+    DEFINES["RTC_ENABLE_WIN_WGC"] = True
+    DEFINES["UNICODE"] = True
+    DEFINES["USE_AURA"] = "1"
+    DEFINES["WEBRTC_WIN"] = True
+    DEFINES["WIN32"] = True
+    DEFINES["WIN32_LEAN_AND_MEAN"] = True
+    DEFINES["WINAPI_FAMILY"] = "WINAPI_FAMILY_DESKTOP_APP"
+    DEFINES["WINVER"] = "0x0A00"
+    DEFINES["_ATL_NO_OPENGL"] = True
+    DEFINES["_CRT_RAND_S"] = True
+    DEFINES["_CRT_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_ENABLE_EXTENDED_ALIGNED_STORAGE"] = True
+    DEFINES["_HAS_EXCEPTIONS"] = "0"
+    DEFINES["_HAS_NODISCARD"] = True
+    DEFINES["_SCL_SECURE_NO_DEPRECATE"] = True
+    DEFINES["_SECURE_ATL"] = True
+    DEFINES["_UNICODE"] = True
+    DEFINES["_WIN32_WINNT"] = "0x0A00"
+    DEFINES["_WINDOWS"] = True
+    DEFINES["__STD_C"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["WEBRTC_ARCH_ARM64"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+if CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["WEBRTC_ARCH_ARM"] = True
+    DEFINES["WEBRTC_ARCH_ARM_V7"] = True
+    DEFINES["WEBRTC_HAS_NEON"] = True
+
+    SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_arm.S"
+    ]
+
+if CONFIG["TARGET_CPU"] == "mips32":
+
+    DEFINES["MIPS32_LE"] = True
+    DEFINES["MIPS_FPU_LE"] = True
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_mips.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "mips64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "ppc64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["TARGET_CPU"] == "x86":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["WEBRTC_ENABLE_AVX2"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Android":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Darwin":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "OpenBSD":
+
+    DEFINES["_DEBUG"] = True
+
+if CONFIG["MOZ_DEBUG"] == "1" and CONFIG["OS_TARGET"] == "WINNT":
+
+    DEFINES["_HAS_ITERATOR_DEBUGGING"] = "0"
+
+if CONFIG["MOZ_X11"] == "1" and CONFIG["OS_TARGET"] == "Linux":
+
+    DEFINES["USE_X11"] = "1"
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "arm":
+
+    OS_LIBS += [
+        "android_support",
+        "unwind"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86":
+
+    CFLAGS += [
+        "-msse2"
+    ]
+
+    OS_LIBS += [
+        "android_support"
+    ]
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Android" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "aarch64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "arm":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "riscv64":
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86":
+
+    CFLAGS += [
+        "-msse2"
+    ]
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+if CONFIG["OS_TARGET"] == "Linux" and CONFIG["TARGET_CPU"] == "x86_64":
+
+    DEFINES["_GNU_SOURCE"] = True
+
+    UNIFIED_SOURCES += [
+        "/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.c"
+    ]
+
+Library("spl_sqrt_floor_gn")
diff --git a/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_mips.c b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_mips.c
new file mode 100644
index 0000000000..04033c14de
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor_mips.c
@@ -0,0 +1,207 @@
+/*
+ * Written by Wilco Dijkstra, 1996. The following email exchange establishes the
+ * license.
+ *
+ * From: Wilco Dijkstra <Wilco.Dijkstra@ntlworld.com>
+ * Date: Fri, Jun 24, 2011 at 3:20 AM
+ * Subject: Re: sqrt routine
+ * To: Kevin Ma <kma@google.com>
+ * Hi Kevin,
+ * Thanks for asking. Those routines are public domain (originally posted to
+ * comp.sys.arm a long time ago), so you can use them freely for any purpose.
+ * Cheers,
+ * Wilco
+ *
+ * ----- Original Message -----
+ * From: "Kevin Ma" <kma@google.com>
+ * To: <Wilco.Dijkstra@ntlworld.com>
+ * Sent: Thursday, June 23, 2011 11:44 PM
+ * Subject: Fwd: sqrt routine
+ * Hi Wilco,
+ * I saw your sqrt routine from several web sites, including
+ * http://www.finesse.demon.co.uk/steven/sqrt.html.
+ * Just wonder if there's any copyright information with your Successive
+ * approximation routines, or if I can freely use it for any purpose.
+ * Thanks.
+ * Kevin
+ */
+
+// Minor modifications in code style for WebRTC, 2012.
+// Code optimizations for MIPS, 2013.
+
+#include "common_audio/third_party/spl_sqrt_floor/spl_sqrt_floor.h"
+
+/*
+ * Algorithm:
+ * Successive approximation of the equation (root + delta) ^ 2 = N
+ * until delta < 1. If delta < 1 we have the integer part of SQRT (N).
+ * Use delta = 2^i for i = 15 .. 0.
+ *
+ * Output precision is 16 bits. Note for large input values (close to
+ * 0x7FFFFFFF), bit 15 (the highest bit of the low 16-bit half word)
+ * contains the MSB information (a non-sign value). Do with caution
+ * if you need to cast the output to int16_t type.
+ *
+ * If the input value is negative, it returns 0.
+ */
+
+
+int32_t WebRtcSpl_SqrtFloor(int32_t value)
+{
+  int32_t root = 0, tmp1, tmp2, tmp3, tmp4;
+
+  __asm __volatile(
+    ".set   push                                       \n\t"
+    ".set   noreorder                                  \n\t"
+
+    "lui    %[tmp1],      0x4000                       \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "sub    %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "lui    %[tmp1],      0x1                          \n\t"
+    "or     %[tmp4],      %[root],      %[tmp1]        \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x4000         \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      14                           \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x8000         \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x2000         \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      13                           \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x4000         \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x1000         \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      12                           \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x2000         \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x800          \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      11                           \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x1000         \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x400          \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      10                           \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x800          \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x200          \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      9                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],       0x400         \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x100          \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      8                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x200          \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x80           \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      7                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x100          \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x40           \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      6                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x80           \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x20           \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      5                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x40           \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x10           \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      4                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x20           \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x8            \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      3                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x10           \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x4            \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      2                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x8            \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x2            \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "sll    %[tmp1],      1                            \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "subu   %[tmp3],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x4            \n\t"
+    "movz   %[value],     %[tmp3],      %[tmp2]        \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    "addiu  %[tmp1],      $0,           0x1            \n\t"
+    "addu   %[tmp1],      %[tmp1],      %[root]        \n\t"
+    "slt    %[tmp2],      %[value],     %[tmp1]        \n\t"
+    "ori    %[tmp4],      %[root],      0x2            \n\t"
+    "movz   %[root],      %[tmp4],      %[tmp2]        \n\t"
+
+    ".set   pop                                        \n\t"
+
+    : [root] "+r" (root), [value] "+r" (value),
+      [tmp1] "=&r" (tmp1), [tmp2] "=&r" (tmp2),
+      [tmp3] "=&r" (tmp3), [tmp4] "=&r" (tmp4)
+    :
+  );
+
+  return root >> 1;
+}
+
diff --git a/third_party/libwebrtc/common_audio/vad/include/vad.h b/third_party/libwebrtc/common_audio/vad/include/vad.h
new file mode 100644
index 0000000000..b15275b166
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/include/vad.h
@@ -0,0 +1,50 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_VAD_INCLUDE_VAD_H_
+#define COMMON_AUDIO_VAD_INCLUDE_VAD_H_
+
+#include <memory>
+
+#include "common_audio/vad/include/webrtc_vad.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+class Vad {
+ public:
+  enum Aggressiveness {
+    kVadNormal = 0,
+    kVadLowBitrate = 1,
+    kVadAggressive = 2,
+    kVadVeryAggressive = 3
+  };
+
+  enum Activity { kPassive = 0, kActive = 1, kError = -1 };
+
+  virtual ~Vad() = default;
+
+  // Calculates a VAD decision for the given audio frame. Valid sample rates
+  // are 8000, 16000, and 32000 Hz; the number of samples must be such that the
+  // frame is 10, 20, or 30 ms long.
+  virtual Activity VoiceActivity(const int16_t* audio,
+                                 size_t num_samples,
+                                 int sample_rate_hz) = 0;
+
+  // Resets VAD state.
+  virtual void Reset() = 0;
+};
+
+// Returns a Vad instance that's implemented on top of WebRtcVad.
+std::unique_ptr<Vad> CreateVad(Vad::Aggressiveness aggressiveness);
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_VAD_INCLUDE_VAD_H_
diff --git a/third_party/libwebrtc/common_audio/vad/include/webrtc_vad.h b/third_party/libwebrtc/common_audio/vad/include/webrtc_vad.h
new file mode 100644
index 0000000000..31e628f058
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/include/webrtc_vad.h
@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This header file includes the VAD API calls. Specific function calls are
+ * given below.
+ */
+
+#ifndef COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_  // NOLINT
+#define COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct WebRtcVadInst VadInst;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Creates an instance to the VAD structure.
+VadInst* WebRtcVad_Create(void);
+
+// Frees the dynamic memory of a specified VAD instance.
+//
+// - handle [i] : Pointer to VAD instance that should be freed.
+void WebRtcVad_Free(VadInst* handle);
+
+// Initializes a VAD instance.
+//
+// - handle [i/o] : Instance that should be initialized.
+//
+// returns        : 0 - (OK),
+//                 -1 - (null pointer or Default mode could not be set).
+int WebRtcVad_Init(VadInst* handle);
+
+// Sets the VAD operating mode. A more aggressive (higher mode) VAD is more
+// restrictive in reporting speech. Put in other words the probability of being
+// speech when the VAD returns 1 is increased with increasing mode. As a
+// consequence also the missed detection rate goes up.
+//
+// - handle [i/o] : VAD instance.
+// - mode   [i]   : Aggressiveness mode (0, 1, 2, or 3).
+//
+// returns        : 0 - (OK),
+//                 -1 - (null pointer, mode could not be set or the VAD instance
+//                       has not been initialized).
+int WebRtcVad_set_mode(VadInst* handle, int mode);
+
+// Calculates a VAD decision for the `audio_frame`. For valid sampling rates
+// frame lengths, see the description of WebRtcVad_ValidRatesAndFrameLengths().
+//
+// - handle       [i/o] : VAD Instance. Needs to be initialized by
+//                        WebRtcVad_Init() before call.
+// - fs           [i]   : Sampling frequency (Hz): 8000, 16000, or 32000
+// - audio_frame  [i]   : Audio frame buffer.
+// - frame_length [i]   : Length of audio frame buffer in number of samples.
+//
+// returns              : 1 - (Active Voice),
+//                        0 - (Non-active Voice),
+//                       -1 - (Error)
+int WebRtcVad_Process(VadInst* handle,
+                      int fs,
+                      const int16_t* audio_frame,
+                      size_t frame_length);
+
+// Checks for valid combinations of `rate` and `frame_length`. We support 10,
+// 20 and 30 ms frames and the rates 8000, 16000 and 32000 Hz.
+//
+// - rate         [i] : Sampling frequency (Hz).
+// - frame_length [i] : Speech frame buffer length in number of samples.
+//
+// returns            : 0 - (valid combination), -1 - (invalid combination)
+int WebRtcVad_ValidRateAndFrameLength(int rate, size_t frame_length);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_  // NOLINT
diff --git a/third_party/libwebrtc/common_audio/vad/mock/mock_vad.h b/third_party/libwebrtc/common_audio/vad/mock/mock_vad.h
new file mode 100644
index 0000000000..5a554ce1f9
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/mock/mock_vad.h
@@ -0,0 +1,33 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_VAD_MOCK_MOCK_VAD_H_
+#define COMMON_AUDIO_VAD_MOCK_MOCK_VAD_H_
+
+#include "common_audio/vad/include/vad.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockVad : public Vad {
+ public:
+  ~MockVad() override { Die(); }
+  MOCK_METHOD(void, Die, ());
+
+  MOCK_METHOD(enum Activity,
+              VoiceActivity,
+              (const int16_t* audio, size_t num_samples, int sample_rate_hz),
+              (override));
+  MOCK_METHOD(void, Reset, (), (override));
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_VAD_MOCK_MOCK_VAD_H_
diff --git a/third_party/libwebrtc/common_audio/vad/vad.cc b/third_party/libwebrtc/common_audio/vad/vad.cc
new file mode 100644
index 0000000000..1647246590
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad.cc
@@ -0,0 +1,66 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/include/vad.h"
+
+#include <memory>
+
+#include "common_audio/vad/include/webrtc_vad.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+namespace {
+
+class VadImpl final : public Vad {
+ public:
+  explicit VadImpl(Aggressiveness aggressiveness)
+      : handle_(nullptr), aggressiveness_(aggressiveness) {
+    Reset();
+  }
+
+  ~VadImpl() override { WebRtcVad_Free(handle_); }
+
+  Activity VoiceActivity(const int16_t* audio,
+                         size_t num_samples,
+                         int sample_rate_hz) override {
+    int ret = WebRtcVad_Process(handle_, sample_rate_hz, audio, num_samples);
+    switch (ret) {
+      case 0:
+        return kPassive;
+      case 1:
+        return kActive;
+      default:
+        RTC_DCHECK_NOTREACHED() << "WebRtcVad_Process returned an error.";
+        return kError;
+    }
+  }
+
+  void Reset() override {
+    if (handle_)
+      WebRtcVad_Free(handle_);
+    handle_ = WebRtcVad_Create();
+    RTC_CHECK(handle_);
+    RTC_CHECK_EQ(WebRtcVad_Init(handle_), 0);
+    RTC_CHECK_EQ(WebRtcVad_set_mode(handle_, aggressiveness_), 0);
+  }
+
+ private:
+  VadInst* handle_;
+  Aggressiveness aggressiveness_;
+};
+
+}  // namespace
+
+std::unique_ptr<Vad> CreateVad(Vad::Aggressiveness aggressiveness) {
+  return std::unique_ptr<Vad>(new VadImpl(aggressiveness));
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/vad/vad_core.c b/third_party/libwebrtc/common_audio/vad/vad_core.c
new file mode 100644
index 0000000000..0872449a7c
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_core.c
@@ -0,0 +1,685 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/vad_core.h"
+
+#include "rtc_base/sanitizer.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/vad/vad_filterbank.h"
+#include "common_audio/vad/vad_gmm.h"
+#include "common_audio/vad/vad_sp.h"
+
+// Spectrum Weighting
+static const int16_t kSpectrumWeight[kNumChannels] = { 6, 8, 10, 12, 14, 16 };
+static const int16_t kNoiseUpdateConst = 655; // Q15
+static const int16_t kSpeechUpdateConst = 6554; // Q15
+static const int16_t kBackEta = 154; // Q8
+// Minimum difference between the two models, Q5
+static const int16_t kMinimumDifference[kNumChannels] = {
+    544, 544, 576, 576, 576, 576 };
+// Upper limit of mean value for speech model, Q7
+static const int16_t kMaximumSpeech[kNumChannels] = {
+    11392, 11392, 11520, 11520, 11520, 11520 };
+// Minimum value for mean value
+static const int16_t kMinimumMean[kNumGaussians] = { 640, 768 };
+// Upper limit of mean value for noise model, Q7
+static const int16_t kMaximumNoise[kNumChannels] = {
+    9216, 9088, 8960, 8832, 8704, 8576 };
+// Start values for the Gaussian models, Q7
+// Weights for the two Gaussians for the six channels (noise)
+static const int16_t kNoiseDataWeights[kTableSize] = {
+    34, 62, 72, 66, 53, 25, 94, 66, 56, 62, 75, 103 };
+// Weights for the two Gaussians for the six channels (speech)
+static const int16_t kSpeechDataWeights[kTableSize] = {
+    48, 82, 45, 87, 50, 47, 80, 46, 83, 41, 78, 81 };
+// Means for the two Gaussians for the six channels (noise)
+static const int16_t kNoiseDataMeans[kTableSize] = {
+    6738, 4892, 7065, 6715, 6771, 3369, 7646, 3863, 7820, 7266, 5020, 4362 };
+// Means for the two Gaussians for the six channels (speech)
+static const int16_t kSpeechDataMeans[kTableSize] = {
+    8306, 10085, 10078, 11823, 11843, 6309, 9473, 9571, 10879, 7581, 8180, 7483
+};
+// Stds for the two Gaussians for the six channels (noise)
+static const int16_t kNoiseDataStds[kTableSize] = {
+    378, 1064, 493, 582, 688, 593, 474, 697, 475, 688, 421, 455 };
+// Stds for the two Gaussians for the six channels (speech)
+static const int16_t kSpeechDataStds[kTableSize] = {
+    555, 505, 567, 524, 585, 1231, 509, 828, 492, 1540, 1079, 850 };
+
+// Constants used in GmmProbability().
+//
+// Maximum number of counted speech (VAD = 1) frames in a row.
+static const int16_t kMaxSpeechFrames = 6;
+// Minimum standard deviation for both speech and noise.
+static const int16_t kMinStd = 384;
+
+// Constants in WebRtcVad_InitCore().
+// Default aggressiveness mode.
+static const short kDefaultMode = 0;
+static const int kInitCheck = 42;
+
+// Constants used in WebRtcVad_set_mode_core().
+//
+// Thresholds for different frame lengths (10 ms, 20 ms and 30 ms).
+//
+// Mode 0, Quality.
+static const int16_t kOverHangMax1Q[3] = { 8, 4, 3 };
+static const int16_t kOverHangMax2Q[3] = { 14, 7, 5 };
+static const int16_t kLocalThresholdQ[3] = { 24, 21, 24 };
+static const int16_t kGlobalThresholdQ[3] = { 57, 48, 57 };
+// Mode 1, Low bitrate.
+static const int16_t kOverHangMax1LBR[3] = { 8, 4, 3 };
+static const int16_t kOverHangMax2LBR[3] = { 14, 7, 5 };
+static const int16_t kLocalThresholdLBR[3] = { 37, 32, 37 };
+static const int16_t kGlobalThresholdLBR[3] = { 100, 80, 100 };
+// Mode 2, Aggressive.
+static const int16_t kOverHangMax1AGG[3] = { 6, 3, 2 };
+static const int16_t kOverHangMax2AGG[3] = { 9, 5, 3 };
+static const int16_t kLocalThresholdAGG[3] = { 82, 78, 82 };
+static const int16_t kGlobalThresholdAGG[3] = { 285, 260, 285 };
+// Mode 3, Very aggressive.
+static const int16_t kOverHangMax1VAG[3] = { 6, 3, 2 };
+static const int16_t kOverHangMax2VAG[3] = { 9, 5, 3 };
+static const int16_t kLocalThresholdVAG[3] = { 94, 94, 94 };
+static const int16_t kGlobalThresholdVAG[3] = { 1100, 1050, 1100 };
+
+// Calculates the weighted average w.r.t. number of Gaussians. The `data` are
+// updated with an `offset` before averaging.
+//
+// - data     [i/o] : Data to average.
+// - offset   [i]   : An offset added to `data`.
+// - weights  [i]   : Weights used for averaging.
+//
+// returns          : The weighted average.
+static int32_t WeightedAverage(int16_t* data, int16_t offset,
+                               const int16_t* weights) {
+  int k;
+  int32_t weighted_average = 0;
+
+  for (k = 0; k < kNumGaussians; k++) {
+    data[k * kNumChannels] += offset;
+    weighted_average += data[k * kNumChannels] * weights[k * kNumChannels];
+  }
+  return weighted_average;
+}
+
+// An s16 x s32 -> s32 multiplication that's allowed to overflow. (It's still
+// undefined behavior, so not a good idea; this just makes UBSan ignore the
+// violation, so that our old code can continue to do what it's always been
+// doing.)
+static inline int32_t RTC_NO_SANITIZE("signed-integer-overflow")
+    OverflowingMulS16ByS32ToS32(int16_t a, int32_t b) {
+  return a * b;
+}
+
+// Calculates the probabilities for both speech and background noise using
+// Gaussian Mixture Models (GMM). A hypothesis-test is performed to decide which
+// type of signal is most probable.
+//
+// - self           [i/o] : Pointer to VAD instance
+// - features       [i]   : Feature vector of length `kNumChannels`
+//                          = log10(energy in frequency band)
+// - total_power    [i]   : Total power in audio frame.
+// - frame_length   [i]   : Number of input samples
+//
+// - returns              : the VAD decision (0 - noise, 1 - speech).
+static int16_t GmmProbability(VadInstT* self, int16_t* features,
+                              int16_t total_power, size_t frame_length) {
+  int channel, k;
+  int16_t feature_minimum;
+  int16_t h0, h1;
+  int16_t log_likelihood_ratio;
+  int16_t vadflag = 0;
+  int16_t shifts_h0, shifts_h1;
+  int16_t tmp_s16, tmp1_s16, tmp2_s16;
+  int16_t diff;
+  int gaussian;
+  int16_t nmk, nmk2, nmk3, smk, smk2, nsk, ssk;
+  int16_t delt, ndelt;
+  int16_t maxspe, maxmu;
+  int16_t deltaN[kTableSize], deltaS[kTableSize];
+  int16_t ngprvec[kTableSize] = { 0 };  // Conditional probability = 0.
+  int16_t sgprvec[kTableSize] = { 0 };  // Conditional probability = 0.
+  int32_t h0_test, h1_test;
+  int32_t tmp1_s32, tmp2_s32;
+  int32_t sum_log_likelihood_ratios = 0;
+  int32_t noise_global_mean, speech_global_mean;
+  int32_t noise_probability[kNumGaussians], speech_probability[kNumGaussians];
+  int16_t overhead1, overhead2, individualTest, totalTest;
+
+  // Set various thresholds based on frame lengths (80, 160 or 240 samples).
+  if (frame_length == 80) {
+    overhead1 = self->over_hang_max_1[0];
+    overhead2 = self->over_hang_max_2[0];
+    individualTest = self->individual[0];
+    totalTest = self->total[0];
+  } else if (frame_length == 160) {
+    overhead1 = self->over_hang_max_1[1];
+    overhead2 = self->over_hang_max_2[1];
+    individualTest = self->individual[1];
+    totalTest = self->total[1];
+  } else {
+    overhead1 = self->over_hang_max_1[2];
+    overhead2 = self->over_hang_max_2[2];
+    individualTest = self->individual[2];
+    totalTest = self->total[2];
+  }
+
+  if (total_power > kMinEnergy) {
+    // The signal power of current frame is large enough for processing. The
+    // processing consists of two parts:
+    // 1) Calculating the likelihood of speech and thereby a VAD decision.
+    // 2) Updating the underlying model, w.r.t., the decision made.
+
+    // The detection scheme is an LRT with hypothesis
+    // H0: Noise
+    // H1: Speech
+    //
+    // We combine a global LRT with local tests, for each frequency sub-band,
+    // here defined as `channel`.
+    for (channel = 0; channel < kNumChannels; channel++) {
+      // For each channel we model the probability with a GMM consisting of
+      // `kNumGaussians`, with different means and standard deviations depending
+      // on H0 or H1.
+      h0_test = 0;
+      h1_test = 0;
+      for (k = 0; k < kNumGaussians; k++) {
+        gaussian = channel + k * kNumChannels;
+        // Probability under H0, that is, probability of frame being noise.
+        // Value given in Q27 = Q7 * Q20.
+        tmp1_s32 = WebRtcVad_GaussianProbability(features[channel],
+                                                 self->noise_means[gaussian],
+                                                 self->noise_stds[gaussian],
+                                                 &deltaN[gaussian]);
+        noise_probability[k] = kNoiseDataWeights[gaussian] * tmp1_s32;
+        h0_test += noise_probability[k];  // Q27
+
+        // Probability under H1, that is, probability of frame being speech.
+        // Value given in Q27 = Q7 * Q20.
+        tmp1_s32 = WebRtcVad_GaussianProbability(features[channel],
+                                                 self->speech_means[gaussian],
+                                                 self->speech_stds[gaussian],
+                                                 &deltaS[gaussian]);
+        speech_probability[k] = kSpeechDataWeights[gaussian] * tmp1_s32;
+        h1_test += speech_probability[k];  // Q27
+      }
+
+      // Calculate the log likelihood ratio: log2(Pr{X|H1} / Pr{X|H1}).
+      // Approximation:
+      // log2(Pr{X|H1} / Pr{X|H1}) = log2(Pr{X|H1}*2^Q) - log2(Pr{X|H1}*2^Q)
+      //                           = log2(h1_test) - log2(h0_test)
+      //                           = log2(2^(31-shifts_h1)*(1+b1))
+      //                             - log2(2^(31-shifts_h0)*(1+b0))
+      //                           = shifts_h0 - shifts_h1
+      //                             + log2(1+b1) - log2(1+b0)
+      //                          ~= shifts_h0 - shifts_h1
+      //
+      // Note that b0 and b1 are values less than 1, hence, 0 <= log2(1+b0) < 1.
+      // Further, b0 and b1 are independent and on the average the two terms
+      // cancel.
+      shifts_h0 = WebRtcSpl_NormW32(h0_test);
+      shifts_h1 = WebRtcSpl_NormW32(h1_test);
+      if (h0_test == 0) {
+        shifts_h0 = 31;
+      }
+      if (h1_test == 0) {
+        shifts_h1 = 31;
+      }
+      log_likelihood_ratio = shifts_h0 - shifts_h1;
+
+      // Update `sum_log_likelihood_ratios` with spectrum weighting. This is
+      // used for the global VAD decision.
+      sum_log_likelihood_ratios +=
+          (int32_t) (log_likelihood_ratio * kSpectrumWeight[channel]);
+
+      // Local VAD decision.
+      if ((log_likelihood_ratio * 4) > individualTest) {
+        vadflag = 1;
+      }
+
+      // TODO(bjornv): The conditional probabilities below are applied on the
+      // hard coded number of Gaussians set to two. Find a way to generalize.
+      // Calculate local noise probabilities used later when updating the GMM.
+      h0 = (int16_t) (h0_test >> 12);  // Q15
+      if (h0 > 0) {
+        // High probability of noise. Assign conditional probabilities for each
+        // Gaussian in the GMM.
+        tmp1_s32 = (noise_probability[0] & 0xFFFFF000) << 2;  // Q29
+        ngprvec[channel] = (int16_t) WebRtcSpl_DivW32W16(tmp1_s32, h0);  // Q14
+        ngprvec[channel + kNumChannels] = 16384 - ngprvec[channel];
+      } else {
+        // Low noise probability. Assign conditional probability 1 to the first
+        // Gaussian and 0 to the rest (which is already set at initialization).
+        ngprvec[channel] = 16384;
+      }
+
+      // Calculate local speech probabilities used later when updating the GMM.
+      h1 = (int16_t) (h1_test >> 12);  // Q15
+      if (h1 > 0) {
+        // High probability of speech. Assign conditional probabilities for each
+        // Gaussian in the GMM. Otherwise use the initialized values, i.e., 0.
+        tmp1_s32 = (speech_probability[0] & 0xFFFFF000) << 2;  // Q29
+        sgprvec[channel] = (int16_t) WebRtcSpl_DivW32W16(tmp1_s32, h1);  // Q14
+        sgprvec[channel + kNumChannels] = 16384 - sgprvec[channel];
+      }
+    }
+
+    // Make a global VAD decision.
+    vadflag |= (sum_log_likelihood_ratios >= totalTest);
+
+    // Update the model parameters.
+    maxspe = 12800;
+    for (channel = 0; channel < kNumChannels; channel++) {
+
+      // Get minimum value in past which is used for long term correction in Q4.
+      feature_minimum = WebRtcVad_FindMinimum(self, features[channel], channel);
+
+      // Compute the "global" mean, that is the sum of the two means weighted.
+      noise_global_mean = WeightedAverage(&self->noise_means[channel], 0,
+                                          &kNoiseDataWeights[channel]);
+      tmp1_s16 = (int16_t) (noise_global_mean >> 6);  // Q8
+
+      for (k = 0; k < kNumGaussians; k++) {
+        gaussian = channel + k * kNumChannels;
+
+        nmk = self->noise_means[gaussian];
+        smk = self->speech_means[gaussian];
+        nsk = self->noise_stds[gaussian];
+        ssk = self->speech_stds[gaussian];
+
+        // Update noise mean vector if the frame consists of noise only.
+        nmk2 = nmk;
+        if (!vadflag) {
+          // deltaN = (x-mu)/sigma^2
+          // ngprvec[k] = `noise_probability[k]` /
+          //   (`noise_probability[0]` + `noise_probability[1]`)
+
+          // (Q14 * Q11 >> 11) = Q14.
+          delt = (int16_t)((ngprvec[gaussian] * deltaN[gaussian]) >> 11);
+          // Q7 + (Q14 * Q15 >> 22) = Q7.
+          nmk2 = nmk + (int16_t)((delt * kNoiseUpdateConst) >> 22);
+        }
+
+        // Long term correction of the noise mean.
+        // Q8 - Q8 = Q8.
+        ndelt = (feature_minimum << 4) - tmp1_s16;
+        // Q7 + (Q8 * Q8) >> 9 = Q7.
+        nmk3 = nmk2 + (int16_t)((ndelt * kBackEta) >> 9);
+
+        // Control that the noise mean does not drift to much.
+        tmp_s16 = (int16_t) ((k + 5) << 7);
+        if (nmk3 < tmp_s16) {
+          nmk3 = tmp_s16;
+        }
+        tmp_s16 = (int16_t) ((72 + k - channel) << 7);
+        if (nmk3 > tmp_s16) {
+          nmk3 = tmp_s16;
+        }
+        self->noise_means[gaussian] = nmk3;
+
+        if (vadflag) {
+          // Update speech mean vector:
+          // `deltaS` = (x-mu)/sigma^2
+          // sgprvec[k] = `speech_probability[k]` /
+          //   (`speech_probability[0]` + `speech_probability[1]`)
+
+          // (Q14 * Q11) >> 11 = Q14.
+          delt = (int16_t)((sgprvec[gaussian] * deltaS[gaussian]) >> 11);
+          // Q14 * Q15 >> 21 = Q8.
+          tmp_s16 = (int16_t)((delt * kSpeechUpdateConst) >> 21);
+          // Q7 + (Q8 >> 1) = Q7. With rounding.
+          smk2 = smk + ((tmp_s16 + 1) >> 1);
+
+          // Control that the speech mean does not drift to much.
+          maxmu = maxspe + 640;
+          if (smk2 < kMinimumMean[k]) {
+            smk2 = kMinimumMean[k];
+          }
+          if (smk2 > maxmu) {
+            smk2 = maxmu;
+          }
+          self->speech_means[gaussian] = smk2;  // Q7.
+
+          // (Q7 >> 3) = Q4. With rounding.
+          tmp_s16 = ((smk + 4) >> 3);
+
+          tmp_s16 = features[channel] - tmp_s16;  // Q4
+          // (Q11 * Q4 >> 3) = Q12.
+          tmp1_s32 = (deltaS[gaussian] * tmp_s16) >> 3;
+          tmp2_s32 = tmp1_s32 - 4096;
+          tmp_s16 = sgprvec[gaussian] >> 2;
+          // (Q14 >> 2) * Q12 = Q24.
+          tmp1_s32 = tmp_s16 * tmp2_s32;
+
+          tmp2_s32 = tmp1_s32 >> 4;  // Q20
+
+          // 0.1 * Q20 / Q7 = Q13.
+          if (tmp2_s32 > 0) {
+            tmp_s16 = (int16_t) WebRtcSpl_DivW32W16(tmp2_s32, ssk * 10);
+          } else {
+            tmp_s16 = (int16_t) WebRtcSpl_DivW32W16(-tmp2_s32, ssk * 10);
+            tmp_s16 = -tmp_s16;
+          }
+          // Divide by 4 giving an update factor of 0.025 (= 0.1 / 4).
+          // Note that division by 4 equals shift by 2, hence,
+          // (Q13 >> 8) = (Q13 >> 6) / 4 = Q7.
+          tmp_s16 += 128;  // Rounding.
+          ssk += (tmp_s16 >> 8);
+          if (ssk < kMinStd) {
+            ssk = kMinStd;
+          }
+          self->speech_stds[gaussian] = ssk;
+        } else {
+          // Update GMM variance vectors.
+          // deltaN * (features[channel] - nmk) - 1
+          // Q4 - (Q7 >> 3) = Q4.
+          tmp_s16 = features[channel] - (nmk >> 3);
+          // (Q11 * Q4 >> 3) = Q12.
+          tmp1_s32 = (deltaN[gaussian] * tmp_s16) >> 3;
+          tmp1_s32 -= 4096;
+
+          // (Q14 >> 2) * Q12 = Q24.
+          tmp_s16 = (ngprvec[gaussian] + 2) >> 2;
+          tmp2_s32 = OverflowingMulS16ByS32ToS32(tmp_s16, tmp1_s32);
+          // Q20  * approx 0.001 (2^-10=0.0009766), hence,
+          // (Q24 >> 14) = (Q24 >> 4) / 2^10 = Q20.
+          tmp1_s32 = tmp2_s32 >> 14;
+
+          // Q20 / Q7 = Q13.
+          if (tmp1_s32 > 0) {
+            tmp_s16 = (int16_t) WebRtcSpl_DivW32W16(tmp1_s32, nsk);
+          } else {
+            tmp_s16 = (int16_t) WebRtcSpl_DivW32W16(-tmp1_s32, nsk);
+            tmp_s16 = -tmp_s16;
+          }
+          tmp_s16 += 32;  // Rounding
+          nsk += tmp_s16 >> 6;  // Q13 >> 6 = Q7.
+          if (nsk < kMinStd) {
+            nsk = kMinStd;
+          }
+          self->noise_stds[gaussian] = nsk;
+        }
+      }
+
+      // Separate models if they are too close.
+      // `noise_global_mean` in Q14 (= Q7 * Q7).
+      noise_global_mean = WeightedAverage(&self->noise_means[channel], 0,
+                                          &kNoiseDataWeights[channel]);
+
+      // `speech_global_mean` in Q14 (= Q7 * Q7).
+      speech_global_mean = WeightedAverage(&self->speech_means[channel], 0,
+                                           &kSpeechDataWeights[channel]);
+
+      // `diff` = "global" speech mean - "global" noise mean.
+      // (Q14 >> 9) - (Q14 >> 9) = Q5.
+      diff = (int16_t) (speech_global_mean >> 9) -
+          (int16_t) (noise_global_mean >> 9);
+      if (diff < kMinimumDifference[channel]) {
+        tmp_s16 = kMinimumDifference[channel] - diff;
+
+        // `tmp1_s16` = ~0.8 * (kMinimumDifference - diff) in Q7.
+        // `tmp2_s16` = ~0.2 * (kMinimumDifference - diff) in Q7.
+        tmp1_s16 = (int16_t)((13 * tmp_s16) >> 2);
+        tmp2_s16 = (int16_t)((3 * tmp_s16) >> 2);
+
+        // Move Gaussian means for speech model by `tmp1_s16` and update
+        // `speech_global_mean`. Note that `self->speech_means[channel]` is
+        // changed after the call.
+        speech_global_mean = WeightedAverage(&self->speech_means[channel],
+                                             tmp1_s16,
+                                             &kSpeechDataWeights[channel]);
+
+        // Move Gaussian means for noise model by -`tmp2_s16` and update
+        // `noise_global_mean`. Note that `self->noise_means[channel]` is
+        // changed after the call.
+        noise_global_mean = WeightedAverage(&self->noise_means[channel],
+                                            -tmp2_s16,
+                                            &kNoiseDataWeights[channel]);
+      }
+
+      // Control that the speech & noise means do not drift to much.
+      maxspe = kMaximumSpeech[channel];
+      tmp2_s16 = (int16_t) (speech_global_mean >> 7);
+      if (tmp2_s16 > maxspe) {
+        // Upper limit of speech model.
+        tmp2_s16 -= maxspe;
+
+        for (k = 0; k < kNumGaussians; k++) {
+          self->speech_means[channel + k * kNumChannels] -= tmp2_s16;
+        }
+      }
+
+      tmp2_s16 = (int16_t) (noise_global_mean >> 7);
+      if (tmp2_s16 > kMaximumNoise[channel]) {
+        tmp2_s16 -= kMaximumNoise[channel];
+
+        for (k = 0; k < kNumGaussians; k++) {
+          self->noise_means[channel + k * kNumChannels] -= tmp2_s16;
+        }
+      }
+    }
+    self->frame_counter++;
+  }
+
+  // Smooth with respect to transition hysteresis.
+  if (!vadflag) {
+    if (self->over_hang > 0) {
+      vadflag = 2 + self->over_hang;
+      self->over_hang--;
+    }
+    self->num_of_speech = 0;
+  } else {
+    self->num_of_speech++;
+    if (self->num_of_speech > kMaxSpeechFrames) {
+      self->num_of_speech = kMaxSpeechFrames;
+      self->over_hang = overhead2;
+    } else {
+      self->over_hang = overhead1;
+    }
+  }
+  return vadflag;
+}
+
+// Initialize the VAD. Set aggressiveness mode to default value.
+int WebRtcVad_InitCore(VadInstT* self) {
+  int i;
+
+  if (self == NULL) {
+    return -1;
+  }
+
+  // Initialization of general struct variables.
+  self->vad = 1;  // Speech active (=1).
+  self->frame_counter = 0;
+  self->over_hang = 0;
+  self->num_of_speech = 0;
+
+  // Initialization of downsampling filter state.
+  memset(self->downsampling_filter_states, 0,
+         sizeof(self->downsampling_filter_states));
+
+  // Initialization of 48 to 8 kHz downsampling.
+  WebRtcSpl_ResetResample48khzTo8khz(&self->state_48_to_8);
+
+  // Read initial PDF parameters.
+  for (i = 0; i < kTableSize; i++) {
+    self->noise_means[i] = kNoiseDataMeans[i];
+    self->speech_means[i] = kSpeechDataMeans[i];
+    self->noise_stds[i] = kNoiseDataStds[i];
+    self->speech_stds[i] = kSpeechDataStds[i];
+  }
+
+  // Initialize Index and Minimum value vectors.
+  for (i = 0; i < 16 * kNumChannels; i++) {
+    self->low_value_vector[i] = 10000;
+    self->index_vector[i] = 0;
+  }
+
+  // Initialize splitting filter states.
+  memset(self->upper_state, 0, sizeof(self->upper_state));
+  memset(self->lower_state, 0, sizeof(self->lower_state));
+
+  // Initialize high pass filter states.
+  memset(self->hp_filter_state, 0, sizeof(self->hp_filter_state));
+
+  // Initialize mean value memory, for WebRtcVad_FindMinimum().
+  for (i = 0; i < kNumChannels; i++) {
+    self->mean_value[i] = 1600;
+  }
+
+  // Set aggressiveness mode to default (=`kDefaultMode`).
+  if (WebRtcVad_set_mode_core(self, kDefaultMode) != 0) {
+    return -1;
+  }
+
+  self->init_flag = kInitCheck;
+
+  return 0;
+}
+
+// Set aggressiveness mode
+int WebRtcVad_set_mode_core(VadInstT* self, int mode) {
+  int return_value = 0;
+
+  switch (mode) {
+    case 0:
+      // Quality mode.
+      memcpy(self->over_hang_max_1, kOverHangMax1Q,
+             sizeof(self->over_hang_max_1));
+      memcpy(self->over_hang_max_2, kOverHangMax2Q,
+             sizeof(self->over_hang_max_2));
+      memcpy(self->individual, kLocalThresholdQ,
+             sizeof(self->individual));
+      memcpy(self->total, kGlobalThresholdQ,
+             sizeof(self->total));
+      break;
+    case 1:
+      // Low bitrate mode.
+      memcpy(self->over_hang_max_1, kOverHangMax1LBR,
+             sizeof(self->over_hang_max_1));
+      memcpy(self->over_hang_max_2, kOverHangMax2LBR,
+             sizeof(self->over_hang_max_2));
+      memcpy(self->individual, kLocalThresholdLBR,
+             sizeof(self->individual));
+      memcpy(self->total, kGlobalThresholdLBR,
+             sizeof(self->total));
+      break;
+    case 2:
+      // Aggressive mode.
+      memcpy(self->over_hang_max_1, kOverHangMax1AGG,
+             sizeof(self->over_hang_max_1));
+      memcpy(self->over_hang_max_2, kOverHangMax2AGG,
+             sizeof(self->over_hang_max_2));
+      memcpy(self->individual, kLocalThresholdAGG,
+             sizeof(self->individual));
+      memcpy(self->total, kGlobalThresholdAGG,
+             sizeof(self->total));
+      break;
+    case 3:
+      // Very aggressive mode.
+      memcpy(self->over_hang_max_1, kOverHangMax1VAG,
+             sizeof(self->over_hang_max_1));
+      memcpy(self->over_hang_max_2, kOverHangMax2VAG,
+             sizeof(self->over_hang_max_2));
+      memcpy(self->individual, kLocalThresholdVAG,
+             sizeof(self->individual));
+      memcpy(self->total, kGlobalThresholdVAG,
+             sizeof(self->total));
+      break;
+    default:
+      return_value = -1;
+      break;
+  }
+
+  return return_value;
+}
+
+// Calculate VAD decision by first extracting feature values and then calculate
+// probability for both speech and background noise.
+
+int WebRtcVad_CalcVad48khz(VadInstT* inst, const int16_t* speech_frame,
+                           size_t frame_length) {
+  int vad;
+  size_t i;
+  int16_t speech_nb[240];  // 30 ms in 8 kHz.
+  // `tmp_mem` is a temporary memory used by resample function, length is
+  // frame length in 10 ms (480 samples) + 256 extra.
+  int32_t tmp_mem[480 + 256] = { 0 };
+  const size_t kFrameLen10ms48khz = 480;
+  const size_t kFrameLen10ms8khz = 80;
+  size_t num_10ms_frames = frame_length / kFrameLen10ms48khz;
+
+  for (i = 0; i < num_10ms_frames; i++) {
+    WebRtcSpl_Resample48khzTo8khz(speech_frame,
+                                  &speech_nb[i * kFrameLen10ms8khz],
+                                  &inst->state_48_to_8,
+                                  tmp_mem);
+  }
+
+  // Do VAD on an 8 kHz signal
+  vad = WebRtcVad_CalcVad8khz(inst, speech_nb, frame_length / 6);
+
+  return vad;
+}
+
+int WebRtcVad_CalcVad32khz(VadInstT* inst, const int16_t* speech_frame,
+                           size_t frame_length)
+{
+    size_t len;
+    int vad;
+    int16_t speechWB[480]; // Downsampled speech frame: 960 samples (30ms in SWB)
+    int16_t speechNB[240]; // Downsampled speech frame: 480 samples (30ms in WB)
+
+
+    // Downsample signal 32->16->8 before doing VAD
+    WebRtcVad_Downsampling(speech_frame, speechWB, &(inst->downsampling_filter_states[2]),
+                           frame_length);
+    len = frame_length / 2;
+
+    WebRtcVad_Downsampling(speechWB, speechNB, inst->downsampling_filter_states, len);
+    len /= 2;
+
+    // Do VAD on an 8 kHz signal
+    vad = WebRtcVad_CalcVad8khz(inst, speechNB, len);
+
+    return vad;
+}
+
+int WebRtcVad_CalcVad16khz(VadInstT* inst, const int16_t* speech_frame,
+                           size_t frame_length)
+{
+    size_t len;
+    int vad;
+    int16_t speechNB[240]; // Downsampled speech frame: 480 samples (30ms in WB)
+
+    // Wideband: Downsample signal before doing VAD
+    WebRtcVad_Downsampling(speech_frame, speechNB, inst->downsampling_filter_states,
+                           frame_length);
+
+    len = frame_length / 2;
+    vad = WebRtcVad_CalcVad8khz(inst, speechNB, len);
+
+    return vad;
+}
+
+int WebRtcVad_CalcVad8khz(VadInstT* inst, const int16_t* speech_frame,
+                          size_t frame_length)
+{
+    int16_t feature_vector[kNumChannels], total_power;
+
+    // Get power in the bands
+    total_power = WebRtcVad_CalculateFeatures(inst, speech_frame, frame_length,
+                                              feature_vector);
+
+    // Make a VAD
+    inst->vad = GmmProbability(inst, feature_vector, total_power, frame_length);
+
+    return inst->vad;
+}
diff --git a/third_party/libwebrtc/common_audio/vad/vad_core.h b/third_party/libwebrtc/common_audio/vad/vad_core.h
new file mode 100644
index 0000000000..fbaf970065
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_core.h
@@ -0,0 +1,123 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This header file includes the descriptions of the core VAD calls.
+ */
+
+#ifndef COMMON_AUDIO_VAD_VAD_CORE_H_
+#define COMMON_AUDIO_VAD_VAD_CORE_H_
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// TODO(https://bugs.webrtc.org/14476): When converted to C++, remove the macro.
+#if defined(__cplusplus)
+#define CONSTEXPR_INT(x) constexpr int x
+#else
+#define CONSTEXPR_INT(x) enum { x }
+#endif
+
+CONSTEXPR_INT(kNumChannels = 6);  // Number of frequency bands (named channels).
+CONSTEXPR_INT(
+    kNumGaussians = 2);  // Number of Gaussians per channel in the GMM.
+CONSTEXPR_INT(kTableSize = kNumChannels * kNumGaussians);
+CONSTEXPR_INT(
+    kMinEnergy = 10);  // Minimum energy required to trigger audio signal.
+
+typedef struct VadInstT_ {
+  int vad;
+  int32_t downsampling_filter_states[4];
+  WebRtcSpl_State48khzTo8khz state_48_to_8;
+  int16_t noise_means[kTableSize];
+  int16_t speech_means[kTableSize];
+  int16_t noise_stds[kTableSize];
+  int16_t speech_stds[kTableSize];
+  // TODO(bjornv): Change to `frame_count`.
+  int32_t frame_counter;
+  int16_t over_hang;  // Over Hang
+  int16_t num_of_speech;
+  // TODO(bjornv): Change to `age_vector`.
+  int16_t index_vector[16 * kNumChannels];
+  int16_t low_value_vector[16 * kNumChannels];
+  // TODO(bjornv): Change to `median`.
+  int16_t mean_value[kNumChannels];
+  int16_t upper_state[5];
+  int16_t lower_state[5];
+  int16_t hp_filter_state[4];
+  int16_t over_hang_max_1[3];
+  int16_t over_hang_max_2[3];
+  int16_t individual[3];
+  int16_t total[3];
+
+  int init_flag;
+} VadInstT;
+
+// Initializes the core VAD component. The default aggressiveness mode is
+// controlled by `kDefaultMode` in vad_core.c.
+//
+// - self [i/o] : Instance that should be initialized
+//
+// returns      : 0 (OK), -1 (null pointer in or if the default mode can't be
+//                set)
+int WebRtcVad_InitCore(VadInstT* self);
+
+/****************************************************************************
+ * WebRtcVad_set_mode_core(...)
+ *
+ * This function changes the VAD settings
+ *
+ * Input:
+ *      - inst      : VAD instance
+ *      - mode      : Aggressiveness degree
+ *                    0 (High quality) - 3 (Highly aggressive)
+ *
+ * Output:
+ *      - inst      : Changed  instance
+ *
+ * Return value     :  0 - Ok
+ *                    -1 - Error
+ */
+
+int WebRtcVad_set_mode_core(VadInstT* self, int mode);
+
+/****************************************************************************
+ * WebRtcVad_CalcVad48khz(...)
+ * WebRtcVad_CalcVad32khz(...)
+ * WebRtcVad_CalcVad16khz(...)
+ * WebRtcVad_CalcVad8khz(...)
+ *
+ * Calculate probability for active speech and make VAD decision.
+ *
+ * Input:
+ *      - inst          : Instance that should be initialized
+ *      - speech_frame  : Input speech frame
+ *      - frame_length  : Number of input samples
+ *
+ * Output:
+ *      - inst          : Updated filter states etc.
+ *
+ * Return value         : VAD decision
+ *                        0 - No active speech
+ *                        1-6 - Active speech
+ */
+int WebRtcVad_CalcVad48khz(VadInstT* inst,
+                           const int16_t* speech_frame,
+                           size_t frame_length);
+int WebRtcVad_CalcVad32khz(VadInstT* inst,
+                           const int16_t* speech_frame,
+                           size_t frame_length);
+int WebRtcVad_CalcVad16khz(VadInstT* inst,
+                           const int16_t* speech_frame,
+                           size_t frame_length);
+int WebRtcVad_CalcVad8khz(VadInstT* inst,
+                          const int16_t* speech_frame,
+                          size_t frame_length);
+
+#endif  // COMMON_AUDIO_VAD_VAD_CORE_H_
diff --git a/third_party/libwebrtc/common_audio/vad/vad_core_unittest.cc b/third_party/libwebrtc/common_audio/vad/vad_core_unittest.cc
new file mode 100644
index 0000000000..3131a86ae3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_core_unittest.cc
@@ -0,0 +1,106 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdlib.h>
+
+#include "common_audio/vad/vad_unittest.h"
+#include "test/gtest.h"
+
+extern "C" {
+#include "common_audio/vad/vad_core.h"
+}
+
+namespace webrtc {
+namespace test {
+
+TEST_F(VadTest, InitCore) {
+  // Test WebRtcVad_InitCore().
+  VadInstT* self = reinterpret_cast<VadInstT*>(malloc(sizeof(VadInstT)));
+
+  // null pointer test.
+  EXPECT_EQ(-1, WebRtcVad_InitCore(nullptr));
+
+  // Verify return = 0 for non-null pointer.
+  EXPECT_EQ(0, WebRtcVad_InitCore(self));
+  // Verify init_flag is set.
+  EXPECT_EQ(42, self->init_flag);
+
+  free(self);
+}
+
+TEST_F(VadTest, set_mode_core) {
+  VadInstT* self = reinterpret_cast<VadInstT*>(malloc(sizeof(VadInstT)));
+
+  // TODO(bjornv): Add null pointer check if we take care of it in
+  // vad_core.c
+
+  ASSERT_EQ(0, WebRtcVad_InitCore(self));
+  // Test WebRtcVad_set_mode_core().
+  // Invalid modes should return -1.
+  EXPECT_EQ(-1, WebRtcVad_set_mode_core(self, -1));
+  EXPECT_EQ(-1, WebRtcVad_set_mode_core(self, 1000));
+  // Valid modes should return 0.
+  for (size_t j = 0; j < kModesSize; ++j) {
+    EXPECT_EQ(0, WebRtcVad_set_mode_core(self, kModes[j]));
+  }
+
+  free(self);
+}
+
+TEST_F(VadTest, CalcVad) {
+  VadInstT* self = reinterpret_cast<VadInstT*>(malloc(sizeof(VadInstT)));
+  int16_t speech[kMaxFrameLength];
+
+  // TODO(bjornv): Add null pointer check if we take care of it in
+  // vad_core.c
+
+  // Test WebRtcVad_CalcVadXXkhz()
+  // Verify that all zeros in gives VAD = 0 out.
+  memset(speech, 0, sizeof(speech));
+  ASSERT_EQ(0, WebRtcVad_InitCore(self));
+  for (size_t j = 0; j < kFrameLengthsSize; ++j) {
+    if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
+      EXPECT_EQ(0, WebRtcVad_CalcVad8khz(self, speech, kFrameLengths[j]));
+    }
+    if (ValidRatesAndFrameLengths(16000, kFrameLengths[j])) {
+      EXPECT_EQ(0, WebRtcVad_CalcVad16khz(self, speech, kFrameLengths[j]));
+    }
+    if (ValidRatesAndFrameLengths(32000, kFrameLengths[j])) {
+      EXPECT_EQ(0, WebRtcVad_CalcVad32khz(self, speech, kFrameLengths[j]));
+    }
+    if (ValidRatesAndFrameLengths(48000, kFrameLengths[j])) {
+      EXPECT_EQ(0, WebRtcVad_CalcVad48khz(self, speech, kFrameLengths[j]));
+    }
+  }
+
+  // Construct a speech signal that will trigger the VAD in all modes. It is
+  // known that (i * i) will wrap around, but that doesn't matter in this case.
+  for (size_t i = 0; i < kMaxFrameLength; ++i) {
+    speech[i] = static_cast<int16_t>(i * i);
+  }
+  for (size_t j = 0; j < kFrameLengthsSize; ++j) {
+    if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
+      EXPECT_EQ(1, WebRtcVad_CalcVad8khz(self, speech, kFrameLengths[j]));
+    }
+    if (ValidRatesAndFrameLengths(16000, kFrameLengths[j])) {
+      EXPECT_EQ(1, WebRtcVad_CalcVad16khz(self, speech, kFrameLengths[j]));
+    }
+    if (ValidRatesAndFrameLengths(32000, kFrameLengths[j])) {
+      EXPECT_EQ(1, WebRtcVad_CalcVad32khz(self, speech, kFrameLengths[j]));
+    }
+    if (ValidRatesAndFrameLengths(48000, kFrameLengths[j])) {
+      EXPECT_EQ(1, WebRtcVad_CalcVad48khz(self, speech, kFrameLengths[j]));
+    }
+  }
+
+  free(self);
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/vad/vad_filterbank.c b/third_party/libwebrtc/common_audio/vad/vad_filterbank.c
new file mode 100644
index 0000000000..aff63f79cd
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_filterbank.c
@@ -0,0 +1,329 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/vad_filterbank.h"
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// Constants used in LogOfEnergy().
+static const int16_t kLogConst = 24660;  // 160*log10(2) in Q9.
+static const int16_t kLogEnergyIntPart = 14336;  // 14 in Q10
+
+// Coefficients used by HighPassFilter, Q14.
+static const int16_t kHpZeroCoefs[3] = { 6631, -13262, 6631 };
+static const int16_t kHpPoleCoefs[3] = { 16384, -7756, 5620 };
+
+// Allpass filter coefficients, upper and lower, in Q15.
+// Upper: 0.64, Lower: 0.17
+static const int16_t kAllPassCoefsQ15[2] = { 20972, 5571 };
+
+// Adjustment for division with two in SplitFilter.
+static const int16_t kOffsetVector[6] = { 368, 368, 272, 176, 176, 176 };
+
+// High pass filtering, with a cut-off frequency at 80 Hz, if the `data_in` is
+// sampled at 500 Hz.
+//
+// - data_in      [i]   : Input audio data sampled at 500 Hz.
+// - data_length  [i]   : Length of input and output data.
+// - filter_state [i/o] : State of the filter.
+// - data_out     [o]   : Output audio data in the frequency interval
+//                        80 - 250 Hz.
+static void HighPassFilter(const int16_t* data_in, size_t data_length,
+                           int16_t* filter_state, int16_t* data_out) {
+  size_t i;
+  const int16_t* in_ptr = data_in;
+  int16_t* out_ptr = data_out;
+  int32_t tmp32 = 0;
+
+
+  // The sum of the absolute values of the impulse response:
+  // The zero/pole-filter has a max amplification of a single sample of: 1.4546
+  // Impulse response: 0.4047 -0.6179 -0.0266  0.1993  0.1035  -0.0194
+  // The all-zero section has a max amplification of a single sample of: 1.6189
+  // Impulse response: 0.4047 -0.8094  0.4047  0       0        0
+  // The all-pole section has a max amplification of a single sample of: 1.9931
+  // Impulse response: 1.0000  0.4734 -0.1189 -0.2187 -0.0627   0.04532
+
+  for (i = 0; i < data_length; i++) {
+    // All-zero section (filter coefficients in Q14).
+    tmp32 = kHpZeroCoefs[0] * *in_ptr;
+    tmp32 += kHpZeroCoefs[1] * filter_state[0];
+    tmp32 += kHpZeroCoefs[2] * filter_state[1];
+    filter_state[1] = filter_state[0];
+    filter_state[0] = *in_ptr++;
+
+    // All-pole section (filter coefficients in Q14).
+    tmp32 -= kHpPoleCoefs[1] * filter_state[2];
+    tmp32 -= kHpPoleCoefs[2] * filter_state[3];
+    filter_state[3] = filter_state[2];
+    filter_state[2] = (int16_t) (tmp32 >> 14);
+    *out_ptr++ = filter_state[2];
+  }
+}
+
+// All pass filtering of `data_in`, used before splitting the signal into two
+// frequency bands (low pass vs high pass).
+// Note that `data_in` and `data_out` can NOT correspond to the same address.
+//
+// - data_in            [i]   : Input audio signal given in Q0.
+// - data_length        [i]   : Length of input and output data.
+// - filter_coefficient [i]   : Given in Q15.
+// - filter_state       [i/o] : State of the filter given in Q(-1).
+// - data_out           [o]   : Output audio signal given in Q(-1).
+static void AllPassFilter(const int16_t* data_in, size_t data_length,
+                          int16_t filter_coefficient, int16_t* filter_state,
+                          int16_t* data_out) {
+  // The filter can only cause overflow (in the w16 output variable)
+  // if more than 4 consecutive input numbers are of maximum value and
+  // has the the same sign as the impulse responses first taps.
+  // First 6 taps of the impulse response:
+  // 0.6399 0.5905 -0.3779 0.2418 -0.1547 0.0990
+
+  size_t i;
+  int16_t tmp16 = 0;
+  int32_t tmp32 = 0;
+  int32_t state32 = ((int32_t) (*filter_state) * (1 << 16));  // Q15
+
+  for (i = 0; i < data_length; i++) {
+    tmp32 = state32 + filter_coefficient * *data_in;
+    tmp16 = (int16_t) (tmp32 >> 16);  // Q(-1)
+    *data_out++ = tmp16;
+    state32 = (*data_in * (1 << 14)) - filter_coefficient * tmp16;  // Q14
+    state32 *= 2;  // Q15.
+    data_in += 2;
+  }
+
+  *filter_state = (int16_t) (state32 >> 16);  // Q(-1)
+}
+
+// Splits `data_in` into `hp_data_out` and `lp_data_out` corresponding to
+// an upper (high pass) part and a lower (low pass) part respectively.
+//
+// - data_in      [i]   : Input audio data to be split into two frequency bands.
+// - data_length  [i]   : Length of `data_in`.
+// - upper_state  [i/o] : State of the upper filter, given in Q(-1).
+// - lower_state  [i/o] : State of the lower filter, given in Q(-1).
+// - hp_data_out  [o]   : Output audio data of the upper half of the spectrum.
+//                        The length is `data_length` / 2.
+// - lp_data_out  [o]   : Output audio data of the lower half of the spectrum.
+//                        The length is `data_length` / 2.
+static void SplitFilter(const int16_t* data_in, size_t data_length,
+                        int16_t* upper_state, int16_t* lower_state,
+                        int16_t* hp_data_out, int16_t* lp_data_out) {
+  size_t i;
+  size_t half_length = data_length >> 1;  // Downsampling by 2.
+  int16_t tmp_out;
+
+  // All-pass filtering upper branch.
+  AllPassFilter(&data_in[0], half_length, kAllPassCoefsQ15[0], upper_state,
+                hp_data_out);
+
+  // All-pass filtering lower branch.
+  AllPassFilter(&data_in[1], half_length, kAllPassCoefsQ15[1], lower_state,
+                lp_data_out);
+
+  // Make LP and HP signals.
+  for (i = 0; i < half_length; i++) {
+    tmp_out = *hp_data_out;
+    *hp_data_out++ -= *lp_data_out;
+    *lp_data_out++ += tmp_out;
+  }
+}
+
+// Calculates the energy of `data_in` in dB, and also updates an overall
+// `total_energy` if necessary.
+//
+// - data_in      [i]   : Input audio data for energy calculation.
+// - data_length  [i]   : Length of input data.
+// - offset       [i]   : Offset value added to `log_energy`.
+// - total_energy [i/o] : An external energy updated with the energy of
+//                        `data_in`.
+//                        NOTE: `total_energy` is only updated if
+//                        `total_energy` <= `kMinEnergy`.
+// - log_energy   [o]   : 10 * log10("energy of `data_in`") given in Q4.
+static void LogOfEnergy(const int16_t* data_in, size_t data_length,
+                        int16_t offset, int16_t* total_energy,
+                        int16_t* log_energy) {
+  // `tot_rshifts` accumulates the number of right shifts performed on `energy`.
+  int tot_rshifts = 0;
+  // The `energy` will be normalized to 15 bits. We use unsigned integer because
+  // we eventually will mask out the fractional part.
+  uint32_t energy = 0;
+
+  RTC_DCHECK(data_in);
+  RTC_DCHECK_GT(data_length, 0);
+
+  energy = (uint32_t) WebRtcSpl_Energy((int16_t*) data_in, data_length,
+                                       &tot_rshifts);
+
+  if (energy != 0) {
+    // By construction, normalizing to 15 bits is equivalent with 17 leading
+    // zeros of an unsigned 32 bit value.
+    int normalizing_rshifts = 17 - WebRtcSpl_NormU32(energy);
+    // In a 15 bit representation the leading bit is 2^14. log2(2^14) in Q10 is
+    // (14 << 10), which is what we initialize `log2_energy` with. For a more
+    // detailed derivations, see below.
+    int16_t log2_energy = kLogEnergyIntPart;
+
+    tot_rshifts += normalizing_rshifts;
+    // Normalize `energy` to 15 bits.
+    // `tot_rshifts` is now the total number of right shifts performed on
+    // `energy` after normalization. This means that `energy` is in
+    // Q(-tot_rshifts).
+    if (normalizing_rshifts < 0) {
+      energy <<= -normalizing_rshifts;
+    } else {
+      energy >>= normalizing_rshifts;
+    }
+
+    // Calculate the energy of `data_in` in dB, in Q4.
+    //
+    // 10 * log10("true energy") in Q4 = 2^4 * 10 * log10("true energy") =
+    // 160 * log10(`energy` * 2^`tot_rshifts`) =
+    // 160 * log10(2) * log2(`energy` * 2^`tot_rshifts`) =
+    // 160 * log10(2) * (log2(`energy`) + log2(2^`tot_rshifts`)) =
+    // (160 * log10(2)) * (log2(`energy`) + `tot_rshifts`) =
+    // `kLogConst` * (`log2_energy` + `tot_rshifts`)
+    //
+    // We know by construction that `energy` is normalized to 15 bits. Hence,
+    // `energy` = 2^14 + frac_Q15, where frac_Q15 is a fractional part in Q15.
+    // Further, we'd like `log2_energy` in Q10
+    // log2(`energy`) in Q10 = 2^10 * log2(2^14 + frac_Q15) =
+    // 2^10 * log2(2^14 * (1 + frac_Q15 * 2^-14)) =
+    // 2^10 * (14 + log2(1 + frac_Q15 * 2^-14)) ~=
+    // (14 << 10) + 2^10 * (frac_Q15 * 2^-14) =
+    // (14 << 10) + (frac_Q15 * 2^-4) = (14 << 10) + (frac_Q15 >> 4)
+    //
+    // Note that frac_Q15 = (`energy` & 0x00003FFF)
+
+    // Calculate and add the fractional part to `log2_energy`.
+    log2_energy += (int16_t) ((energy & 0x00003FFF) >> 4);
+
+    // `kLogConst` is in Q9, `log2_energy` in Q10 and `tot_rshifts` in Q0.
+    // Note that we in our derivation above have accounted for an output in Q4.
+    *log_energy = (int16_t)(((kLogConst * log2_energy) >> 19) +
+        ((tot_rshifts * kLogConst) >> 9));
+
+    if (*log_energy < 0) {
+      *log_energy = 0;
+    }
+  } else {
+    *log_energy = offset;
+    return;
+  }
+
+  *log_energy += offset;
+
+  // Update the approximate `total_energy` with the energy of `data_in`, if
+  // `total_energy` has not exceeded `kMinEnergy`. `total_energy` is used as an
+  // energy indicator in WebRtcVad_GmmProbability() in vad_core.c.
+  if (*total_energy <= kMinEnergy) {
+    if (tot_rshifts >= 0) {
+      // We know by construction that the `energy` > `kMinEnergy` in Q0, so add
+      // an arbitrary value such that `total_energy` exceeds `kMinEnergy`.
+      *total_energy += kMinEnergy + 1;
+    } else {
+      // By construction `energy` is represented by 15 bits, hence any number of
+      // right shifted `energy` will fit in an int16_t. In addition, adding the
+      // value to `total_energy` is wrap around safe as long as
+      // `kMinEnergy` < 8192.
+      *total_energy += (int16_t) (energy >> -tot_rshifts);  // Q0.
+    }
+  }
+}
+
+int16_t WebRtcVad_CalculateFeatures(VadInstT* self, const int16_t* data_in,
+                                    size_t data_length, int16_t* features) {
+  int16_t total_energy = 0;
+  // We expect `data_length` to be 80, 160 or 240 samples, which corresponds to
+  // 10, 20 or 30 ms in 8 kHz. Therefore, the intermediate downsampled data will
+  // have at most 120 samples after the first split and at most 60 samples after
+  // the second split.
+  int16_t hp_120[120], lp_120[120];
+  int16_t hp_60[60], lp_60[60];
+  const size_t half_data_length = data_length >> 1;
+  size_t length = half_data_length;  // `data_length` / 2, corresponds to
+                                     // bandwidth = 2000 Hz after downsampling.
+
+  // Initialize variables for the first SplitFilter().
+  int frequency_band = 0;
+  const int16_t* in_ptr = data_in;  // [0 - 4000] Hz.
+  int16_t* hp_out_ptr = hp_120;  // [2000 - 4000] Hz.
+  int16_t* lp_out_ptr = lp_120;  // [0 - 2000] Hz.
+
+  RTC_DCHECK_LE(data_length, 240);
+  RTC_DCHECK_LT(4, kNumChannels - 1);  // Checking maximum `frequency_band`.
+
+  // Split at 2000 Hz and downsample.
+  SplitFilter(in_ptr, data_length, &self->upper_state[frequency_band],
+              &self->lower_state[frequency_band], hp_out_ptr, lp_out_ptr);
+
+  // For the upper band (2000 Hz - 4000 Hz) split at 3000 Hz and downsample.
+  frequency_band = 1;
+  in_ptr = hp_120;  // [2000 - 4000] Hz.
+  hp_out_ptr = hp_60;  // [3000 - 4000] Hz.
+  lp_out_ptr = lp_60;  // [2000 - 3000] Hz.
+  SplitFilter(in_ptr, length, &self->upper_state[frequency_band],
+              &self->lower_state[frequency_band], hp_out_ptr, lp_out_ptr);
+
+  // Energy in 3000 Hz - 4000 Hz.
+  length >>= 1;  // `data_length` / 4 <=> bandwidth = 1000 Hz.
+
+  LogOfEnergy(hp_60, length, kOffsetVector[5], &total_energy, &features[5]);
+
+  // Energy in 2000 Hz - 3000 Hz.
+  LogOfEnergy(lp_60, length, kOffsetVector[4], &total_energy, &features[4]);
+
+  // For the lower band (0 Hz - 2000 Hz) split at 1000 Hz and downsample.
+  frequency_band = 2;
+  in_ptr = lp_120;  // [0 - 2000] Hz.
+  hp_out_ptr = hp_60;  // [1000 - 2000] Hz.
+  lp_out_ptr = lp_60;  // [0 - 1000] Hz.
+  length = half_data_length;  // `data_length` / 2 <=> bandwidth = 2000 Hz.
+  SplitFilter(in_ptr, length, &self->upper_state[frequency_band],
+              &self->lower_state[frequency_band], hp_out_ptr, lp_out_ptr);
+
+  // Energy in 1000 Hz - 2000 Hz.
+  length >>= 1;  // `data_length` / 4 <=> bandwidth = 1000 Hz.
+  LogOfEnergy(hp_60, length, kOffsetVector[3], &total_energy, &features[3]);
+
+  // For the lower band (0 Hz - 1000 Hz) split at 500 Hz and downsample.
+  frequency_band = 3;
+  in_ptr = lp_60;  // [0 - 1000] Hz.
+  hp_out_ptr = hp_120;  // [500 - 1000] Hz.
+  lp_out_ptr = lp_120;  // [0 - 500] Hz.
+  SplitFilter(in_ptr, length, &self->upper_state[frequency_band],
+              &self->lower_state[frequency_band], hp_out_ptr, lp_out_ptr);
+
+  // Energy in 500 Hz - 1000 Hz.
+  length >>= 1;  // `data_length` / 8 <=> bandwidth = 500 Hz.
+  LogOfEnergy(hp_120, length, kOffsetVector[2], &total_energy, &features[2]);
+
+  // For the lower band (0 Hz - 500 Hz) split at 250 Hz and downsample.
+  frequency_band = 4;
+  in_ptr = lp_120;  // [0 - 500] Hz.
+  hp_out_ptr = hp_60;  // [250 - 500] Hz.
+  lp_out_ptr = lp_60;  // [0 - 250] Hz.
+  SplitFilter(in_ptr, length, &self->upper_state[frequency_band],
+              &self->lower_state[frequency_band], hp_out_ptr, lp_out_ptr);
+
+  // Energy in 250 Hz - 500 Hz.
+  length >>= 1;  // `data_length` / 16 <=> bandwidth = 250 Hz.
+  LogOfEnergy(hp_60, length, kOffsetVector[1], &total_energy, &features[1]);
+
+  // Remove 0 Hz - 80 Hz, by high pass filtering the lower band.
+  HighPassFilter(lp_60, length, self->hp_filter_state, hp_120);
+
+  // Energy in 80 Hz - 250 Hz.
+  LogOfEnergy(hp_120, length, kOffsetVector[0], &total_energy, &features[0]);
+
+  return total_energy;
+}
diff --git a/third_party/libwebrtc/common_audio/vad/vad_filterbank.h b/third_party/libwebrtc/common_audio/vad/vad_filterbank.h
new file mode 100644
index 0000000000..205eac832c
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_filterbank.h
@@ -0,0 +1,45 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This file includes feature calculating functionality used in vad_core.c.
+ */
+
+#ifndef COMMON_AUDIO_VAD_VAD_FILTERBANK_H_
+#define COMMON_AUDIO_VAD_VAD_FILTERBANK_H_
+
+#include "common_audio/vad/vad_core.h"
+
+// Takes `data_length` samples of `data_in` and calculates the logarithm of the
+// energy of each of the `kNumChannels` = 6 frequency bands used by the VAD:
+//        80 Hz - 250 Hz
+//        250 Hz - 500 Hz
+//        500 Hz - 1000 Hz
+//        1000 Hz - 2000 Hz
+//        2000 Hz - 3000 Hz
+//        3000 Hz - 4000 Hz
+//
+// The values are given in Q4 and written to `features`. Further, an approximate
+// overall energy is returned. The return value is used in
+// WebRtcVad_GmmProbability() as a signal indicator, hence it is arbitrary above
+// the threshold `kMinEnergy`.
+//
+// - self         [i/o] : State information of the VAD.
+// - data_in      [i]   : Input audio data, for feature extraction.
+// - data_length  [i]   : Audio data size, in number of samples.
+// - features     [o]   : 10 * log10(energy in each frequency band), Q4.
+// - returns            : Total energy of the signal (NOTE! This value is not
+//                        exact. It is only used in a comparison.)
+int16_t WebRtcVad_CalculateFeatures(VadInstT* self,
+                                    const int16_t* data_in,
+                                    size_t data_length,
+                                    int16_t* features);
+
+#endif  // COMMON_AUDIO_VAD_VAD_FILTERBANK_H_
diff --git a/third_party/libwebrtc/common_audio/vad/vad_filterbank_unittest.cc b/third_party/libwebrtc/common_audio/vad/vad_filterbank_unittest.cc
new file mode 100644
index 0000000000..51d8d0fefd
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_filterbank_unittest.cc
@@ -0,0 +1,91 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdlib.h>
+
+#include "common_audio/vad/vad_unittest.h"
+#include "test/gtest.h"
+
+extern "C" {
+#include "common_audio/vad/vad_core.h"
+#include "common_audio/vad/vad_filterbank.h"
+}
+
+namespace webrtc {
+namespace test {
+
+const int kNumValidFrameLengths = 3;
+
+TEST_F(VadTest, vad_filterbank) {
+  VadInstT* self = reinterpret_cast<VadInstT*>(malloc(sizeof(VadInstT)));
+  static const int16_t kReference[kNumValidFrameLengths] = {48, 11, 11};
+  static const int16_t kFeatures[kNumValidFrameLengths * kNumChannels] = {
+      1213, 759,  587,  462,  434,  272,  1479, 1385, 1291,
+      1200, 1103, 1099, 1732, 1692, 1681, 1629, 1436, 1436};
+  static const int16_t kOffsetVector[kNumChannels] = {368, 368, 272,
+                                                      176, 176, 176};
+  int16_t features[kNumChannels];
+
+  // Construct a speech signal that will trigger the VAD in all modes. It is
+  // known that (i * i) will wrap around, but that doesn't matter in this case.
+  int16_t speech[kMaxFrameLength];
+  for (size_t i = 0; i < kMaxFrameLength; ++i) {
+    speech[i] = static_cast<int16_t>(i * i);
+  }
+
+  int frame_length_index = 0;
+  ASSERT_EQ(0, WebRtcVad_InitCore(self));
+  for (size_t j = 0; j < kFrameLengthsSize; ++j) {
+    if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
+      EXPECT_EQ(kReference[frame_length_index],
+                WebRtcVad_CalculateFeatures(self, speech, kFrameLengths[j],
+                                            features));
+      for (int k = 0; k < kNumChannels; ++k) {
+        EXPECT_EQ(kFeatures[k + frame_length_index * kNumChannels],
+                  features[k]);
+      }
+      frame_length_index++;
+    }
+  }
+  EXPECT_EQ(kNumValidFrameLengths, frame_length_index);
+
+  // Verify that all zeros in gives kOffsetVector out.
+  memset(speech, 0, sizeof(speech));
+  ASSERT_EQ(0, WebRtcVad_InitCore(self));
+  for (size_t j = 0; j < kFrameLengthsSize; ++j) {
+    if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
+      EXPECT_EQ(0, WebRtcVad_CalculateFeatures(self, speech, kFrameLengths[j],
+                                               features));
+      for (int k = 0; k < kNumChannels; ++k) {
+        EXPECT_EQ(kOffsetVector[k], features[k]);
+      }
+    }
+  }
+
+  // Verify that all ones in gives kOffsetVector out. Any other constant input
+  // will have a small impact in the sub bands.
+  for (size_t i = 0; i < kMaxFrameLength; ++i) {
+    speech[i] = 1;
+  }
+  for (size_t j = 0; j < kFrameLengthsSize; ++j) {
+    if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
+      ASSERT_EQ(0, WebRtcVad_InitCore(self));
+      EXPECT_EQ(0, WebRtcVad_CalculateFeatures(self, speech, kFrameLengths[j],
+                                               features));
+      for (int k = 0; k < kNumChannels; ++k) {
+        EXPECT_EQ(kOffsetVector[k], features[k]);
+      }
+    }
+  }
+
+  free(self);
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/vad/vad_gmm.c b/third_party/libwebrtc/common_audio/vad/vad_gmm.c
new file mode 100644
index 0000000000..4a7fe67d09
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_gmm.c
@@ -0,0 +1,82 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/vad_gmm.h"
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+static const int32_t kCompVar = 22005;
+static const int16_t kLog2Exp = 5909;  // log2(exp(1)) in Q12.
+
+// For a normal distribution, the probability of `input` is calculated and
+// returned (in Q20). The formula for normal distributed probability is
+//
+// 1 / s * exp(-(x - m)^2 / (2 * s^2))
+//
+// where the parameters are given in the following Q domains:
+// m = `mean` (Q7)
+// s = `std` (Q7)
+// x = `input` (Q4)
+// in addition to the probability we output `delta` (in Q11) used when updating
+// the noise/speech model.
+int32_t WebRtcVad_GaussianProbability(int16_t input,
+                                      int16_t mean,
+                                      int16_t std,
+                                      int16_t* delta) {
+  int16_t tmp16, inv_std, inv_std2, exp_value = 0;
+  int32_t tmp32;
+
+  // Calculate `inv_std` = 1 / s, in Q10.
+  // 131072 = 1 in Q17, and (`std` >> 1) is for rounding instead of truncation.
+  // Q-domain: Q17 / Q7 = Q10.
+  tmp32 = (int32_t) 131072 + (int32_t) (std >> 1);
+  inv_std = (int16_t) WebRtcSpl_DivW32W16(tmp32, std);
+
+  // Calculate `inv_std2` = 1 / s^2, in Q14.
+  tmp16 = (inv_std >> 2);  // Q10 -> Q8.
+  // Q-domain: (Q8 * Q8) >> 2 = Q14.
+  inv_std2 = (int16_t)((tmp16 * tmp16) >> 2);
+  // TODO(bjornv): Investigate if changing to
+  // inv_std2 = (int16_t)((inv_std * inv_std) >> 6);
+  // gives better accuracy.
+
+  tmp16 = (input << 3);  // Q4 -> Q7
+  tmp16 = tmp16 - mean;  // Q7 - Q7 = Q7
+
+  // To be used later, when updating noise/speech model.
+  // `delta` = (x - m) / s^2, in Q11.
+  // Q-domain: (Q14 * Q7) >> 10 = Q11.
+  *delta = (int16_t)((inv_std2 * tmp16) >> 10);
+
+  // Calculate the exponent `tmp32` = (x - m)^2 / (2 * s^2), in Q10. Replacing
+  // division by two with one shift.
+  // Q-domain: (Q11 * Q7) >> 8 = Q10.
+  tmp32 = (*delta * tmp16) >> 9;
+
+  // If the exponent is small enough to give a non-zero probability we calculate
+  // `exp_value` ~= exp(-(x - m)^2 / (2 * s^2))
+  //             ~= exp2(-log2(exp(1)) * `tmp32`).
+  if (tmp32 < kCompVar) {
+    // Calculate `tmp16` = log2(exp(1)) * `tmp32`, in Q10.
+    // Q-domain: (Q12 * Q10) >> 12 = Q10.
+    tmp16 = (int16_t)((kLog2Exp * tmp32) >> 12);
+    tmp16 = -tmp16;
+    exp_value = (0x0400 | (tmp16 & 0x03FF));
+    tmp16 ^= 0xFFFF;
+    tmp16 >>= 10;
+    tmp16 += 1;
+    // Get `exp_value` = exp(-`tmp32`) in Q10.
+    exp_value >>= tmp16;
+  }
+
+  // Calculate and return (1 / s) * exp(-(x - m)^2 / (2 * s^2)), in Q20.
+  // Q-domain: Q10 * Q10 = Q20.
+  return inv_std * exp_value;
+}
diff --git a/third_party/libwebrtc/common_audio/vad/vad_gmm.h b/third_party/libwebrtc/common_audio/vad/vad_gmm.h
new file mode 100644
index 0000000000..ada5189756
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_gmm.h
@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Gaussian probability calculations internally used in vad_core.c.
+
+#ifndef COMMON_AUDIO_VAD_VAD_GMM_H_
+#define COMMON_AUDIO_VAD_VAD_GMM_H_
+
+#include <stdint.h>
+
+// Calculates the probability for `input`, given that `input` comes from a
+// normal distribution with mean and standard deviation (`mean`, `std`).
+//
+// Inputs:
+//      - input         : input sample in Q4.
+//      - mean          : mean input in the statistical model, Q7.
+//      - std           : standard deviation, Q7.
+//
+// Output:
+//
+//      - delta         : input used when updating the model, Q11.
+//                        `delta` = (`input` - `mean`) / `std`^2.
+//
+// Return:
+//   (probability for `input`) =
+//    1 / `std` * exp(-(`input` - `mean`)^2 / (2 * `std`^2));
+int32_t WebRtcVad_GaussianProbability(int16_t input,
+                                      int16_t mean,
+                                      int16_t std,
+                                      int16_t* delta);
+
+#endif  // COMMON_AUDIO_VAD_VAD_GMM_H_
diff --git a/third_party/libwebrtc/common_audio/vad/vad_gmm_unittest.cc b/third_party/libwebrtc/common_audio/vad/vad_gmm_unittest.cc
new file mode 100644
index 0000000000..be61f7f971
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_gmm_unittest.cc
@@ -0,0 +1,44 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/vad_unittest.h"
+#include "test/gtest.h"
+
+extern "C" {
+#include "common_audio/vad/vad_gmm.h"
+}
+
+namespace webrtc {
+namespace test {
+
+TEST_F(VadTest, vad_gmm) {
+  int16_t delta = 0;
+  // Input value at mean.
+  EXPECT_EQ(1048576, WebRtcVad_GaussianProbability(0, 0, 128, &delta));
+  EXPECT_EQ(0, delta);
+  EXPECT_EQ(1048576, WebRtcVad_GaussianProbability(16, 128, 128, &delta));
+  EXPECT_EQ(0, delta);
+  EXPECT_EQ(1048576, WebRtcVad_GaussianProbability(-16, -128, 128, &delta));
+  EXPECT_EQ(0, delta);
+
+  // Largest possible input to give non-zero probability.
+  EXPECT_EQ(1024, WebRtcVad_GaussianProbability(59, 0, 128, &delta));
+  EXPECT_EQ(7552, delta);
+  EXPECT_EQ(1024, WebRtcVad_GaussianProbability(75, 128, 128, &delta));
+  EXPECT_EQ(7552, delta);
+  EXPECT_EQ(1024, WebRtcVad_GaussianProbability(-75, -128, 128, &delta));
+  EXPECT_EQ(-7552, delta);
+
+  // Too large input, should give zero probability.
+  EXPECT_EQ(0, WebRtcVad_GaussianProbability(105, 0, 128, &delta));
+  EXPECT_EQ(13440, delta);
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/vad/vad_sp.c b/third_party/libwebrtc/common_audio/vad/vad_sp.c
new file mode 100644
index 0000000000..3d24cf64b3
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_sp.c
@@ -0,0 +1,176 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/vad_sp.h"
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/vad/vad_core.h"
+
+// Allpass filter coefficients, upper and lower, in Q13.
+// Upper: 0.64, Lower: 0.17.
+static const int16_t kAllPassCoefsQ13[2] = { 5243, 1392 };  // Q13.
+static const int16_t kSmoothingDown = 6553;  // 0.2 in Q15.
+static const int16_t kSmoothingUp = 32439;  // 0.99 in Q15.
+
+// TODO(bjornv): Move this function to vad_filterbank.c.
+// Downsampling filter based on splitting filter and allpass functions.
+void WebRtcVad_Downsampling(const int16_t* signal_in,
+                            int16_t* signal_out,
+                            int32_t* filter_state,
+                            size_t in_length) {
+  int16_t tmp16_1 = 0, tmp16_2 = 0;
+  int32_t tmp32_1 = filter_state[0];
+  int32_t tmp32_2 = filter_state[1];
+  size_t n = 0;
+  // Downsampling by 2 gives half length.
+  size_t half_length = (in_length >> 1);
+
+  // Filter coefficients in Q13, filter state in Q0.
+  for (n = 0; n < half_length; n++) {
+    // All-pass filtering upper branch.
+    tmp16_1 = (int16_t) ((tmp32_1 >> 1) +
+        ((kAllPassCoefsQ13[0] * *signal_in) >> 14));
+    *signal_out = tmp16_1;
+    tmp32_1 = (int32_t)(*signal_in++) - ((kAllPassCoefsQ13[0] * tmp16_1) >> 12);
+
+    // All-pass filtering lower branch.
+    tmp16_2 = (int16_t) ((tmp32_2 >> 1) +
+        ((kAllPassCoefsQ13[1] * *signal_in) >> 14));
+    *signal_out++ += tmp16_2;
+    tmp32_2 = (int32_t)(*signal_in++) - ((kAllPassCoefsQ13[1] * tmp16_2) >> 12);
+  }
+  // Store the filter states.
+  filter_state[0] = tmp32_1;
+  filter_state[1] = tmp32_2;
+}
+
+// Inserts `feature_value` into `low_value_vector`, if it is one of the 16
+// smallest values the last 100 frames. Then calculates and returns the median
+// of the five smallest values.
+int16_t WebRtcVad_FindMinimum(VadInstT* self,
+                              int16_t feature_value,
+                              int channel) {
+  int i = 0, j = 0;
+  int position = -1;
+  // Offset to beginning of the 16 minimum values in memory.
+  const int offset = (channel << 4);
+  int16_t current_median = 1600;
+  int16_t alpha = 0;
+  int32_t tmp32 = 0;
+  // Pointer to memory for the 16 minimum values and the age of each value of
+  // the `channel`.
+  int16_t* age = &self->index_vector[offset];
+  int16_t* smallest_values = &self->low_value_vector[offset];
+
+  RTC_DCHECK_LT(channel, kNumChannels);
+
+  // Each value in `smallest_values` is getting 1 loop older. Update `age`, and
+  // remove old values.
+  for (i = 0; i < 16; i++) {
+    if (age[i] != 100) {
+      age[i]++;
+    } else {
+      // Too old value. Remove from memory and shift larger values downwards.
+      for (j = i; j < 15; j++) {
+        smallest_values[j] = smallest_values[j + 1];
+        age[j] = age[j + 1];
+      }
+      age[15] = 101;
+      smallest_values[15] = 10000;
+    }
+  }
+
+  // Check if `feature_value` is smaller than any of the values in
+  // `smallest_values`. If so, find the `position` where to insert the new value
+  // (`feature_value`).
+  if (feature_value < smallest_values[7]) {
+    if (feature_value < smallest_values[3]) {
+      if (feature_value < smallest_values[1]) {
+        if (feature_value < smallest_values[0]) {
+          position = 0;
+        } else {
+          position = 1;
+        }
+      } else if (feature_value < smallest_values[2]) {
+        position = 2;
+      } else {
+        position = 3;
+      }
+    } else if (feature_value < smallest_values[5]) {
+      if (feature_value < smallest_values[4]) {
+        position = 4;
+      } else {
+        position = 5;
+      }
+    } else if (feature_value < smallest_values[6]) {
+      position = 6;
+    } else {
+      position = 7;
+    }
+  } else if (feature_value < smallest_values[15]) {
+    if (feature_value < smallest_values[11]) {
+      if (feature_value < smallest_values[9]) {
+        if (feature_value < smallest_values[8]) {
+          position = 8;
+        } else {
+          position = 9;
+        }
+      } else if (feature_value < smallest_values[10]) {
+        position = 10;
+      } else {
+        position = 11;
+      }
+    } else if (feature_value < smallest_values[13]) {
+      if (feature_value < smallest_values[12]) {
+        position = 12;
+      } else {
+        position = 13;
+      }
+    } else if (feature_value < smallest_values[14]) {
+      position = 14;
+    } else {
+      position = 15;
+    }
+  }
+
+  // If we have detected a new small value, insert it at the correct position
+  // and shift larger values up.
+  if (position > -1) {
+    for (i = 15; i > position; i--) {
+      smallest_values[i] = smallest_values[i - 1];
+      age[i] = age[i - 1];
+    }
+    smallest_values[position] = feature_value;
+    age[position] = 1;
+  }
+
+  // Get `current_median`.
+  if (self->frame_counter > 2) {
+    current_median = smallest_values[2];
+  } else if (self->frame_counter > 0) {
+    current_median = smallest_values[0];
+  }
+
+  // Smooth the median value.
+  if (self->frame_counter > 0) {
+    if (current_median < self->mean_value[channel]) {
+      alpha = kSmoothingDown;  // 0.2 in Q15.
+    } else {
+      alpha = kSmoothingUp;  // 0.99 in Q15.
+    }
+  }
+  tmp32 = (alpha + 1) * self->mean_value[channel];
+  tmp32 += (WEBRTC_SPL_WORD16_MAX - alpha) * current_median;
+  tmp32 += 16384;
+  self->mean_value[channel] = (int16_t) (tmp32 >> 15);
+
+  return self->mean_value[channel];
+}
diff --git a/third_party/libwebrtc/common_audio/vad/vad_sp.h b/third_party/libwebrtc/common_audio/vad/vad_sp.h
new file mode 100644
index 0000000000..89138c57cf
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_sp.h
@@ -0,0 +1,54 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// This file includes specific signal processing tools used in vad_core.c.
+
+#ifndef COMMON_AUDIO_VAD_VAD_SP_H_
+#define COMMON_AUDIO_VAD_VAD_SP_H_
+
+#include "common_audio/vad/vad_core.h"
+
+// Downsamples the signal by a factor 2, eg. 32->16 or 16->8.
+//
+// Inputs:
+//      - signal_in     : Input signal.
+//      - in_length     : Length of input signal in samples.
+//
+// Input & Output:
+//      - filter_state  : Current filter states of the two all-pass filters. The
+//                        `filter_state` is updated after all samples have been
+//                        processed.
+//
+// Output:
+//      - signal_out    : Downsampled signal (of length `in_length` / 2).
+void WebRtcVad_Downsampling(const int16_t* signal_in,
+                            int16_t* signal_out,
+                            int32_t* filter_state,
+                            size_t in_length);
+
+// Updates and returns the smoothed feature minimum. As minimum we use the
+// median of the five smallest feature values in a 100 frames long window.
+// As long as `handle->frame_counter` is zero, that is, we haven't received any
+// "valid" data, FindMinimum() outputs the default value of 1600.
+//
+// Inputs:
+//      - feature_value : New feature value to update with.
+//      - channel       : Channel number.
+//
+// Input & Output:
+//      - handle        : State information of the VAD.
+//
+// Returns:
+//                      : Smoothed minimum value for a moving window.
+int16_t WebRtcVad_FindMinimum(VadInstT* handle,
+                              int16_t feature_value,
+                              int channel);
+
+#endif  // COMMON_AUDIO_VAD_VAD_SP_H_
diff --git a/third_party/libwebrtc/common_audio/vad/vad_sp_unittest.cc b/third_party/libwebrtc/common_audio/vad/vad_sp_unittest.cc
new file mode 100644
index 0000000000..bf208af3e1
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_sp_unittest.cc
@@ -0,0 +1,73 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdlib.h>
+
+#include "common_audio/vad/vad_unittest.h"
+#include "test/gtest.h"
+
+extern "C" {
+#include "common_audio/vad/vad_core.h"
+#include "common_audio/vad/vad_sp.h"
+}
+
+namespace webrtc {
+namespace test {
+
+TEST_F(VadTest, vad_sp) {
+  VadInstT* self = reinterpret_cast<VadInstT*>(malloc(sizeof(VadInstT)));
+  const size_t kMaxFrameLenSp = 960;  // Maximum frame length in this unittest.
+  int16_t zeros[kMaxFrameLenSp] = {0};
+  int32_t state[2] = {0};
+  int16_t data_in[kMaxFrameLenSp];
+  int16_t data_out[kMaxFrameLenSp];
+
+  // We expect the first value to be 1600 as long as `frame_counter` is zero,
+  // which is true for the first iteration.
+  static const int16_t kReferenceMin[32] = {
+      1600, 720, 509, 512, 532, 552,  570, 588, 606, 624, 642,
+      659,  675, 691, 707, 723, 1600, 544, 502, 522, 542, 561,
+      579,  597, 615, 633, 651, 667,  683, 699, 715, 731};
+
+  // Construct a speech signal that will trigger the VAD in all modes. It is
+  // known that (i * i) will wrap around, but that doesn't matter in this case.
+  for (size_t i = 0; i < kMaxFrameLenSp; ++i) {
+    data_in[i] = static_cast<int16_t>(i * i);
+  }
+  // Input values all zeros, expect all zeros out.
+  WebRtcVad_Downsampling(zeros, data_out, state, kMaxFrameLenSp);
+  EXPECT_EQ(0, state[0]);
+  EXPECT_EQ(0, state[1]);
+  for (size_t i = 0; i < kMaxFrameLenSp / 2; ++i) {
+    EXPECT_EQ(0, data_out[i]);
+  }
+  // Make a simple non-zero data test.
+  WebRtcVad_Downsampling(data_in, data_out, state, kMaxFrameLenSp);
+  EXPECT_EQ(207, state[0]);
+  EXPECT_EQ(2270, state[1]);
+
+  ASSERT_EQ(0, WebRtcVad_InitCore(self));
+  // TODO(bjornv): Replace this part of the test with taking values from an
+  // array and calculate the reference value here. Make sure the values are not
+  // ordered.
+  for (int16_t i = 0; i < 16; ++i) {
+    int16_t value = 500 * (i + 1);
+    for (int j = 0; j < kNumChannels; ++j) {
+      // Use values both above and below initialized value.
+      EXPECT_EQ(kReferenceMin[i], WebRtcVad_FindMinimum(self, value, j));
+      EXPECT_EQ(kReferenceMin[i + 16], WebRtcVad_FindMinimum(self, 12000, j));
+    }
+    self->frame_counter++;
+  }
+
+  free(self);
+}
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/vad/vad_unittest.cc b/third_party/libwebrtc/common_audio/vad/vad_unittest.cc
new file mode 100644
index 0000000000..c54014efce
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_unittest.cc
@@ -0,0 +1,148 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/vad_unittest.h"
+
+#include <stdlib.h>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/vad/include/webrtc_vad.h"
+#include "rtc_base/arraysize.h"
+#include "rtc_base/checks.h"
+#include "test/gtest.h"
+
+VadTest::VadTest() {}
+
+void VadTest::SetUp() {}
+
+void VadTest::TearDown() {}
+
+// Returns true if the rate and frame length combination is valid.
+bool VadTest::ValidRatesAndFrameLengths(int rate, size_t frame_length) {
+  if (rate == 8000) {
+    if (frame_length == 80 || frame_length == 160 || frame_length == 240) {
+      return true;
+    }
+    return false;
+  } else if (rate == 16000) {
+    if (frame_length == 160 || frame_length == 320 || frame_length == 480) {
+      return true;
+    }
+    return false;
+  } else if (rate == 32000) {
+    if (frame_length == 320 || frame_length == 640 || frame_length == 960) {
+      return true;
+    }
+    return false;
+  } else if (rate == 48000) {
+    if (frame_length == 480 || frame_length == 960 || frame_length == 1440) {
+      return true;
+    }
+    return false;
+  }
+
+  return false;
+}
+
+namespace webrtc {
+namespace test {
+
+TEST_F(VadTest, ApiTest) {
+  // This API test runs through the APIs for all possible valid and invalid
+  // combinations.
+
+  VadInst* handle = WebRtcVad_Create();
+  int16_t zeros[kMaxFrameLength] = {0};
+
+  // Construct a speech signal that will trigger the VAD in all modes. It is
+  // known that (i * i) will wrap around, but that doesn't matter in this case.
+  int16_t speech[kMaxFrameLength];
+  for (size_t i = 0; i < kMaxFrameLength; i++) {
+    speech[i] = static_cast<int16_t>(i * i);
+  }
+
+  // nullptr instance tests
+  EXPECT_EQ(-1, WebRtcVad_Init(nullptr));
+  EXPECT_EQ(-1, WebRtcVad_set_mode(nullptr, kModes[0]));
+  EXPECT_EQ(-1,
+            WebRtcVad_Process(nullptr, kRates[0], speech, kFrameLengths[0]));
+
+  // WebRtcVad_Create()
+  RTC_CHECK(handle);
+
+  // Not initialized tests
+  EXPECT_EQ(-1, WebRtcVad_Process(handle, kRates[0], speech, kFrameLengths[0]));
+  EXPECT_EQ(-1, WebRtcVad_set_mode(handle, kModes[0]));
+
+  // WebRtcVad_Init() test
+  ASSERT_EQ(0, WebRtcVad_Init(handle));
+
+  // WebRtcVad_set_mode() invalid modes tests. Tries smallest supported value
+  // minus one and largest supported value plus one.
+  EXPECT_EQ(-1, WebRtcVad_set_mode(
+                    handle, WebRtcSpl_MinValueW32(kModes, kModesSize) - 1));
+  EXPECT_EQ(-1, WebRtcVad_set_mode(
+                    handle, WebRtcSpl_MaxValueW32(kModes, kModesSize) + 1));
+
+  // WebRtcVad_Process() tests
+  // nullptr as speech pointer
+  EXPECT_EQ(-1,
+            WebRtcVad_Process(handle, kRates[0], nullptr, kFrameLengths[0]));
+  // Invalid sampling rate
+  EXPECT_EQ(-1, WebRtcVad_Process(handle, 9999, speech, kFrameLengths[0]));
+  // All zeros as input should work
+  EXPECT_EQ(0, WebRtcVad_Process(handle, kRates[0], zeros, kFrameLengths[0]));
+  for (size_t k = 0; k < kModesSize; k++) {
+    // Test valid modes
+    EXPECT_EQ(0, WebRtcVad_set_mode(handle, kModes[k]));
+    // Loop through sampling rate and frame length combinations
+    for (size_t i = 0; i < kRatesSize; i++) {
+      for (size_t j = 0; j < kFrameLengthsSize; j++) {
+        if (ValidRatesAndFrameLengths(kRates[i], kFrameLengths[j])) {
+          EXPECT_EQ(1, WebRtcVad_Process(handle, kRates[i], speech,
+                                         kFrameLengths[j]));
+        } else {
+          EXPECT_EQ(-1, WebRtcVad_Process(handle, kRates[i], speech,
+                                          kFrameLengths[j]));
+        }
+      }
+    }
+  }
+
+  WebRtcVad_Free(handle);
+}
+
+TEST_F(VadTest, ValidRatesFrameLengths) {
+  // This test verifies valid and invalid rate/frame_length combinations. We
+  // loop through some sampling rates and frame lengths from negative values to
+  // values larger than possible.
+  const int kRates[] = {-8000, -4000, 0,     4000,  8000,  8001,
+                        15999, 16000, 32000, 48000, 48001, 96000};
+
+  const size_t kFrameLengths[] = {0,   80,  81,  159, 160,  240,
+                                  320, 480, 640, 960, 1440, 2000};
+
+  for (size_t i = 0; i < arraysize(kRates); i++) {
+    for (size_t j = 0; j < arraysize(kFrameLengths); j++) {
+      if (ValidRatesAndFrameLengths(kRates[i], kFrameLengths[j])) {
+        EXPECT_EQ(
+            0, WebRtcVad_ValidRateAndFrameLength(kRates[i], kFrameLengths[j]));
+      } else {
+        EXPECT_EQ(
+            -1, WebRtcVad_ValidRateAndFrameLength(kRates[i], kFrameLengths[j]));
+      }
+    }
+  }
+}
+
+// TODO(bjornv): Add a process test, run on file.
+
+}  // namespace test
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/vad/vad_unittest.h b/third_party/libwebrtc/common_audio/vad/vad_unittest.h
new file mode 100644
index 0000000000..ee642063af
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/vad_unittest.h
@@ -0,0 +1,48 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_VAD_VAD_UNITTEST_H_
+#define COMMON_AUDIO_VAD_VAD_UNITTEST_H_
+
+#include <stddef.h>  // size_t
+
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace test {
+
+// Modes we support
+const int kModes[] = {0, 1, 2, 3};
+const size_t kModesSize = sizeof(kModes) / sizeof(*kModes);
+
+// Rates we support.
+const int kRates[] = {8000, 12000, 16000, 24000, 32000, 48000};
+const size_t kRatesSize = sizeof(kRates) / sizeof(*kRates);
+
+// Frame lengths we support.
+const size_t kMaxFrameLength = 1440;
+const size_t kFrameLengths[] = {
+    80, 120, 160, 240, 320, 480, 640, 960, kMaxFrameLength};
+const size_t kFrameLengthsSize = sizeof(kFrameLengths) / sizeof(*kFrameLengths);
+
+}  // namespace test
+}  // namespace webrtc
+
+class VadTest : public ::testing::Test {
+ protected:
+  VadTest();
+  void SetUp() override;
+  void TearDown() override;
+
+  // Returns true if the rate and frame length combination is valid.
+  bool ValidRatesAndFrameLengths(int rate, size_t frame_length);
+};
+
+#endif  // COMMON_AUDIO_VAD_VAD_UNITTEST_H_
diff --git a/third_party/libwebrtc/common_audio/vad/webrtc_vad.c b/third_party/libwebrtc/common_audio/vad/webrtc_vad.c
new file mode 100644
index 0000000000..6dd14d8b55
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/vad/webrtc_vad.c
@@ -0,0 +1,114 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/vad/include/webrtc_vad.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "common_audio/vad/vad_core.h"
+
+static const int kInitCheck = 42;
+static const int kValidRates[] = { 8000, 16000, 32000, 48000 };
+static const size_t kRatesSize = sizeof(kValidRates) / sizeof(*kValidRates);
+static const int kMaxFrameLengthMs = 30;
+
+VadInst* WebRtcVad_Create(void) {
+  VadInstT* self = (VadInstT*)malloc(sizeof(VadInstT));
+
+  self->init_flag = 0;
+
+  return (VadInst*)self;
+}
+
+void WebRtcVad_Free(VadInst* handle) {
+  free(handle);
+}
+
+// TODO(bjornv): Move WebRtcVad_InitCore() code here.
+int WebRtcVad_Init(VadInst* handle) {
+  // Initialize the core VAD component.
+  return WebRtcVad_InitCore((VadInstT*) handle);
+}
+
+// TODO(bjornv): Move WebRtcVad_set_mode_core() code here.
+int WebRtcVad_set_mode(VadInst* handle, int mode) {
+  VadInstT* self = (VadInstT*) handle;
+
+  if (handle == NULL) {
+    return -1;
+  }
+  if (self->init_flag != kInitCheck) {
+    return -1;
+  }
+
+  return WebRtcVad_set_mode_core(self, mode);
+}
+
+int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame,
+                      size_t frame_length) {
+  int vad = -1;
+  VadInstT* self = (VadInstT*) handle;
+
+  if (handle == NULL) {
+    return -1;
+  }
+
+  if (self->init_flag != kInitCheck) {
+    return -1;
+  }
+  if (audio_frame == NULL) {
+    return -1;
+  }
+  if (WebRtcVad_ValidRateAndFrameLength(fs, frame_length) != 0) {
+    return -1;
+  }
+
+  if (fs == 48000) {
+      vad = WebRtcVad_CalcVad48khz(self, audio_frame, frame_length);
+  } else if (fs == 32000) {
+    vad = WebRtcVad_CalcVad32khz(self, audio_frame, frame_length);
+  } else if (fs == 16000) {
+    vad = WebRtcVad_CalcVad16khz(self, audio_frame, frame_length);
+  } else if (fs == 8000) {
+    vad = WebRtcVad_CalcVad8khz(self, audio_frame, frame_length);
+  }
+
+  if (vad > 0) {
+    vad = 1;
+  }
+  return vad;
+}
+
+int WebRtcVad_ValidRateAndFrameLength(int rate, size_t frame_length) {
+  int return_value = -1;
+  size_t i;
+  int valid_length_ms;
+  size_t valid_length;
+
+  // We only allow 10, 20 or 30 ms frames. Loop through valid frame rates and
+  // see if we have a matching pair.
+  for (i = 0; i < kRatesSize; i++) {
+    if (kValidRates[i] == rate) {
+      for (valid_length_ms = 10; valid_length_ms <= kMaxFrameLengthMs;
+          valid_length_ms += 10) {
+        valid_length = (size_t)(kValidRates[i] / 1000 * valid_length_ms);
+        if (frame_length == valid_length) {
+          return_value = 0;
+          break;
+        }
+      }
+      break;
+    }
+  }
+
+  return return_value;
+}
diff --git a/third_party/libwebrtc/common_audio/wav_file.cc b/third_party/libwebrtc/common_audio/wav_file.cc
new file mode 100644
index 0000000000..127c9c0757
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/wav_file.cc
@@ -0,0 +1,290 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/wav_file.h"
+
+#include <errno.h>
+
+#include <algorithm>
+#include <array>
+#include <cstdio>
+#include <type_traits>
+#include <utility>
+
+#include "common_audio/include/audio_util.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/system/arch.h"
+
+namespace webrtc {
+namespace {
+
+static_assert(std::is_trivially_destructible<WavFormat>::value, "");
+
+// Checks whether the format is supported or not.
+bool FormatSupported(WavFormat format) {
+  // Only PCM and IEEE Float formats are supported.
+  return format == WavFormat::kWavFormatPcm ||
+         format == WavFormat::kWavFormatIeeeFloat;
+}
+
+// Doesn't take ownership of the file handle and won't close it.
+class WavHeaderFileReader : public WavHeaderReader {
+ public:
+  explicit WavHeaderFileReader(FileWrapper* file) : file_(file) {}
+
+  WavHeaderFileReader(const WavHeaderFileReader&) = delete;
+  WavHeaderFileReader& operator=(const WavHeaderFileReader&) = delete;
+
+  size_t Read(void* buf, size_t num_bytes) override {
+    size_t count = file_->Read(buf, num_bytes);
+    pos_ += count;
+    return count;
+  }
+  bool SeekForward(uint32_t num_bytes) override {
+    bool success = file_->SeekRelative(num_bytes);
+    if (success) {
+      pos_ += num_bytes;
+    }
+    return success;
+  }
+  int64_t GetPosition() override { return pos_; }
+
+ private:
+  FileWrapper* file_;
+  int64_t pos_ = 0;
+};
+
+constexpr size_t kMaxChunksize = 4096;
+
+}  // namespace
+
+WavReader::WavReader(absl::string_view filename)
+    : WavReader(FileWrapper::OpenReadOnly(filename)) {}
+
+WavReader::WavReader(FileWrapper file) : file_(std::move(file)) {
+  RTC_CHECK(file_.is_open())
+      << "Invalid file. Could not create file handle for wav file.";
+
+  WavHeaderFileReader readable(&file_);
+  size_t bytes_per_sample;
+  RTC_CHECK(ReadWavHeader(&readable, &num_channels_, &sample_rate_, &format_,
+                          &bytes_per_sample, &num_samples_in_file_,
+                          &data_start_pos_));
+  num_unread_samples_ = num_samples_in_file_;
+  RTC_CHECK(FormatSupported(format_)) << "Non-implemented wav-format";
+}
+
+void WavReader::Reset() {
+  RTC_CHECK(file_.SeekTo(data_start_pos_))
+      << "Failed to set position in the file to WAV data start position";
+  num_unread_samples_ = num_samples_in_file_;
+}
+
+size_t WavReader::ReadSamples(const size_t num_samples,
+                              int16_t* const samples) {
+#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
+#error "Need to convert samples to big-endian when reading from WAV file"
+#endif
+
+  size_t num_samples_left_to_read = num_samples;
+  size_t next_chunk_start = 0;
+  while (num_samples_left_to_read > 0 && num_unread_samples_ > 0) {
+    const size_t chunk_size = std::min(
+        std::min(kMaxChunksize, num_samples_left_to_read), num_unread_samples_);
+    size_t num_bytes_read;
+    size_t num_samples_read;
+    if (format_ == WavFormat::kWavFormatIeeeFloat) {
+      std::array<float, kMaxChunksize> samples_to_convert;
+      num_bytes_read = file_.Read(samples_to_convert.data(),
+                                  chunk_size * sizeof(samples_to_convert[0]));
+      num_samples_read = num_bytes_read / sizeof(samples_to_convert[0]);
+
+      for (size_t j = 0; j < num_samples_read; ++j) {
+        samples[next_chunk_start + j] = FloatToS16(samples_to_convert[j]);
+      }
+    } else {
+      RTC_CHECK_EQ(format_, WavFormat::kWavFormatPcm);
+      num_bytes_read = file_.Read(&samples[next_chunk_start],
+                                  chunk_size * sizeof(samples[0]));
+      num_samples_read = num_bytes_read / sizeof(samples[0]);
+    }
+    RTC_CHECK(num_samples_read == 0 || (num_bytes_read % num_samples_read) == 0)
+        << "Corrupt file: file ended in the middle of a sample.";
+    RTC_CHECK(num_samples_read == chunk_size || file_.ReadEof())
+        << "Corrupt file: payload size does not match header.";
+
+    next_chunk_start += num_samples_read;
+    num_unread_samples_ -= num_samples_read;
+    num_samples_left_to_read -= num_samples_read;
+  }
+
+  return num_samples - num_samples_left_to_read;
+}
+
+size_t WavReader::ReadSamples(const size_t num_samples, float* const samples) {
+#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
+#error "Need to convert samples to big-endian when reading from WAV file"
+#endif
+
+  size_t num_samples_left_to_read = num_samples;
+  size_t next_chunk_start = 0;
+  while (num_samples_left_to_read > 0 && num_unread_samples_ > 0) {
+    const size_t chunk_size = std::min(
+        std::min(kMaxChunksize, num_samples_left_to_read), num_unread_samples_);
+    size_t num_bytes_read;
+    size_t num_samples_read;
+    if (format_ == WavFormat::kWavFormatPcm) {
+      std::array<int16_t, kMaxChunksize> samples_to_convert;
+      num_bytes_read = file_.Read(samples_to_convert.data(),
+                                  chunk_size * sizeof(samples_to_convert[0]));
+      num_samples_read = num_bytes_read / sizeof(samples_to_convert[0]);
+
+      for (size_t j = 0; j < num_samples_read; ++j) {
+        samples[next_chunk_start + j] =
+            static_cast<float>(samples_to_convert[j]);
+      }
+    } else {
+      RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
+      num_bytes_read = file_.Read(&samples[next_chunk_start],
+                                  chunk_size * sizeof(samples[0]));
+      num_samples_read = num_bytes_read / sizeof(samples[0]);
+
+      for (size_t j = 0; j < num_samples_read; ++j) {
+        samples[next_chunk_start + j] =
+            FloatToFloatS16(samples[next_chunk_start + j]);
+      }
+    }
+    RTC_CHECK(num_samples_read == 0 || (num_bytes_read % num_samples_read) == 0)
+        << "Corrupt file: file ended in the middle of a sample.";
+    RTC_CHECK(num_samples_read == chunk_size || file_.ReadEof())
+        << "Corrupt file: payload size does not match header.";
+
+    next_chunk_start += num_samples_read;
+    num_unread_samples_ -= num_samples_read;
+    num_samples_left_to_read -= num_samples_read;
+  }
+
+  return num_samples - num_samples_left_to_read;
+}
+
+void WavReader::Close() {
+  file_.Close();
+}
+
+WavWriter::WavWriter(absl::string_view filename,
+                     int sample_rate,
+                     size_t num_channels,
+                     SampleFormat sample_format)
+    // Unlike plain fopen, OpenWriteOnly takes care of filename utf8 ->
+    // wchar conversion on windows.
+    : WavWriter(FileWrapper::OpenWriteOnly(filename),
+                sample_rate,
+                num_channels,
+                sample_format) {}
+
+WavWriter::WavWriter(FileWrapper file,
+                     int sample_rate,
+                     size_t num_channels,
+                     SampleFormat sample_format)
+    : sample_rate_(sample_rate),
+      num_channels_(num_channels),
+      num_samples_written_(0),
+      format_(sample_format == SampleFormat::kInt16
+                  ? WavFormat::kWavFormatPcm
+                  : WavFormat::kWavFormatIeeeFloat),
+      file_(std::move(file)) {
+  // Handle errors from the OpenWriteOnly call in above constructor.
+  RTC_CHECK(file_.is_open()) << "Invalid file. Could not create wav file.";
+
+  RTC_CHECK(CheckWavParameters(num_channels_, sample_rate_, format_,
+                               num_samples_written_));
+
+  // Write a blank placeholder header, since we need to know the total number
+  // of samples before we can fill in the real data.
+  static const uint8_t blank_header[MaxWavHeaderSize()] = {0};
+  RTC_CHECK(file_.Write(blank_header, WavHeaderSize(format_)));
+}
+
+void WavWriter::WriteSamples(const int16_t* samples, size_t num_samples) {
+#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
+#error "Need to convert samples to little-endian when writing to WAV file"
+#endif
+
+  for (size_t i = 0; i < num_samples; i += kMaxChunksize) {
+    const size_t num_remaining_samples = num_samples - i;
+    const size_t num_samples_to_write =
+        std::min(kMaxChunksize, num_remaining_samples);
+
+    if (format_ == WavFormat::kWavFormatPcm) {
+      RTC_CHECK(
+          file_.Write(&samples[i], num_samples_to_write * sizeof(samples[0])));
+    } else {
+      RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
+      std::array<float, kMaxChunksize> converted_samples;
+      for (size_t j = 0; j < num_samples_to_write; ++j) {
+        converted_samples[j] = S16ToFloat(samples[i + j]);
+      }
+      RTC_CHECK(
+          file_.Write(converted_samples.data(),
+                      num_samples_to_write * sizeof(converted_samples[0])));
+    }
+
+    num_samples_written_ += num_samples_to_write;
+    RTC_CHECK_GE(num_samples_written_,
+                 num_samples_to_write);  // detect size_t overflow
+  }
+}
+
+void WavWriter::WriteSamples(const float* samples, size_t num_samples) {
+#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
+#error "Need to convert samples to little-endian when writing to WAV file"
+#endif
+
+  for (size_t i = 0; i < num_samples; i += kMaxChunksize) {
+    const size_t num_remaining_samples = num_samples - i;
+    const size_t num_samples_to_write =
+        std::min(kMaxChunksize, num_remaining_samples);
+
+    if (format_ == WavFormat::kWavFormatPcm) {
+      std::array<int16_t, kMaxChunksize> converted_samples;
+      for (size_t j = 0; j < num_samples_to_write; ++j) {
+        converted_samples[j] = FloatS16ToS16(samples[i + j]);
+      }
+      RTC_CHECK(
+          file_.Write(converted_samples.data(),
+                      num_samples_to_write * sizeof(converted_samples[0])));
+    } else {
+      RTC_CHECK_EQ(format_, WavFormat::kWavFormatIeeeFloat);
+      std::array<float, kMaxChunksize> converted_samples;
+      for (size_t j = 0; j < num_samples_to_write; ++j) {
+        converted_samples[j] = FloatS16ToFloat(samples[i + j]);
+      }
+      RTC_CHECK(
+          file_.Write(converted_samples.data(),
+                      num_samples_to_write * sizeof(converted_samples[0])));
+    }
+
+    num_samples_written_ += num_samples_to_write;
+    RTC_CHECK(num_samples_written_ >=
+              num_samples_to_write);  // detect size_t overflow
+  }
+}
+
+void WavWriter::Close() {
+  RTC_CHECK(file_.Rewind());
+  std::array<uint8_t, MaxWavHeaderSize()> header;
+  size_t header_size;
+  WriteWavHeader(num_channels_, sample_rate_, format_, num_samples_written_,
+                 header.data(), &header_size);
+  RTC_CHECK(file_.Write(header.data(), header_size));
+  RTC_CHECK(file_.Close());
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/wav_file.h b/third_party/libwebrtc/common_audio/wav_file.h
new file mode 100644
index 0000000000..72a4db79c2
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/wav_file.h
@@ -0,0 +1,115 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_WAV_FILE_H_
+#define COMMON_AUDIO_WAV_FILE_H_
+
+#include <stdint.h>
+
+#include <cstddef>
+#include <string>
+
+#include "common_audio/wav_header.h"
+#include "rtc_base/system/file_wrapper.h"
+
+namespace webrtc {
+
+// Interface to provide access WAV file parameters.
+class WavFile {
+ public:
+  enum class SampleFormat { kInt16, kFloat };
+
+  virtual ~WavFile() {}
+
+  virtual int sample_rate() const = 0;
+  virtual size_t num_channels() const = 0;
+  virtual size_t num_samples() const = 0;
+};
+
+// Simple C++ class for writing 16-bit integer and 32 bit floating point PCM WAV
+// files. All error handling is by calls to RTC_CHECK(), making it unsuitable
+// for anything but debug code.
+class WavWriter final : public WavFile {
+ public:
+  // Opens a new WAV file for writing.
+  WavWriter(absl::string_view filename,
+            int sample_rate,
+            size_t num_channels,
+            SampleFormat sample_format = SampleFormat::kInt16);
+  WavWriter(FileWrapper file,
+            int sample_rate,
+            size_t num_channels,
+            SampleFormat sample_format = SampleFormat::kInt16);
+
+  // Closes the WAV file, after writing its header.
+  ~WavWriter() { Close(); }
+
+  WavWriter(const WavWriter&) = delete;
+  WavWriter& operator=(const WavWriter&) = delete;
+
+  // Write additional samples to the file. Each sample is in the range
+  // [-32768.0,32767.0], and there must be the previously specified number of
+  // interleaved channels.
+  void WriteSamples(const float* samples, size_t num_samples);
+  void WriteSamples(const int16_t* samples, size_t num_samples);
+
+  int sample_rate() const override { return sample_rate_; }
+  size_t num_channels() const override { return num_channels_; }
+  size_t num_samples() const override { return num_samples_written_; }
+
+ private:
+  void Close();
+  const int sample_rate_;
+  const size_t num_channels_;
+  size_t num_samples_written_;
+  WavFormat format_;
+  FileWrapper file_;
+};
+
+// Follows the conventions of WavWriter.
+class WavReader final : public WavFile {
+ public:
+  // Opens an existing WAV file for reading.
+  explicit WavReader(absl::string_view filename);
+  explicit WavReader(FileWrapper file);
+
+  // Close the WAV file.
+  ~WavReader() { Close(); }
+
+  WavReader(const WavReader&) = delete;
+  WavReader& operator=(const WavReader&) = delete;
+
+  // Resets position to the beginning of the file.
+  void Reset();
+
+  // Returns the number of samples read. If this is less than requested,
+  // verifies that the end of the file was reached.
+  size_t ReadSamples(size_t num_samples, float* samples);
+  size_t ReadSamples(size_t num_samples, int16_t* samples);
+
+  int sample_rate() const override { return sample_rate_; }
+  size_t num_channels() const override { return num_channels_; }
+  size_t num_samples() const override { return num_samples_in_file_; }
+
+ private:
+  void Close();
+  int sample_rate_;
+  size_t num_channels_;
+  WavFormat format_;
+  size_t num_samples_in_file_;
+  size_t num_unread_samples_;
+  FileWrapper file_;
+  int64_t
+      data_start_pos_;  // Position in the file immediately after WAV header.
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_WAV_FILE_H_
diff --git a/third_party/libwebrtc/common_audio/wav_file_unittest.cc b/third_party/libwebrtc/common_audio/wav_file_unittest.cc
new file mode 100644
index 0000000000..97cecc345f
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/wav_file_unittest.cc
@@ -0,0 +1,251 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// MSVC++ requires this to be set before any other includes to get M_PI.
+#define _USE_MATH_DEFINES
+
+#include "common_audio/wav_file.h"
+
+#include <cmath>
+#include <limits>
+
+#include "common_audio/wav_header.h"
+#include "test/gtest.h"
+#include "test/testsupport/file_utils.h"
+
+// WavWriterTest.CPP flaky on Mac. See webrtc:9247.
+#if defined(WEBRTC_MAC)
+#define MAYBE_CPP DISABLED_CPP
+#define MAYBE_CPPReset DISABLED_CPPReset
+#else
+#define MAYBE_CPP CPP
+#define MAYBE_CPPReset CPPReset
+#endif
+
+namespace webrtc {
+
+static const float kSamples[] = {0.0, 10.0, 4e4, -1e9};
+
+// Write a tiny WAV file with the C++ interface and verify the result.
+TEST(WavWriterTest, MAYBE_CPP) {
+  const std::string outfile = test::OutputPath() + "wavtest1.wav";
+  static const size_t kNumSamples = 3;
+  {
+    WavWriter w(outfile, 14099, 1);
+    EXPECT_EQ(14099, w.sample_rate());
+    EXPECT_EQ(1u, w.num_channels());
+    EXPECT_EQ(0u, w.num_samples());
+    w.WriteSamples(kSamples, kNumSamples);
+    EXPECT_EQ(kNumSamples, w.num_samples());
+  }
+  // Write some extra "metadata" to the file that should be silently ignored
+  // by WavReader. We don't use WavWriter directly for this because it doesn't
+  // support metadata.
+  static const uint8_t kMetadata[] = {101, 202};
+  {
+    FILE* f = fopen(outfile.c_str(), "ab");
+    ASSERT_TRUE(f);
+    ASSERT_EQ(1u, fwrite(kMetadata, sizeof(kMetadata), 1, f));
+    fclose(f);
+  }
+  static const uint8_t kExpectedContents[] = {
+      // clang-format off
+      // clang formatting doesn't respect inline comments.
+    'R', 'I', 'F', 'F',
+    42, 0, 0, 0,  // size of whole file - 8: 6 + 44 - 8
+    'W', 'A', 'V', 'E',
+    'f', 'm', 't', ' ',
+    16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+    1, 0,  // format: PCM (1)
+    1, 0,  // channels: 1
+    0x13, 0x37, 0, 0,  // sample rate: 14099
+    0x26, 0x6e, 0, 0,  // byte rate: 2 * 14099
+    2, 0,  // block align: NumChannels * BytesPerSample
+    16, 0,  // bits per sample: 2 * 8
+    'd', 'a', 't', 'a',
+    6, 0, 0, 0,  // size of payload: 6
+    0, 0,  // first sample: 0.0
+    10, 0,  // second sample: 10.0
+    0xff, 0x7f,  // third sample: 4e4 (saturated)
+    kMetadata[0], kMetadata[1],
+      // clang-format on
+  };
+  static const size_t kContentSize =
+      kPcmWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
+  static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
+  EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
+  FILE* f = fopen(outfile.c_str(), "rb");
+  ASSERT_TRUE(f);
+  uint8_t contents[kContentSize];
+  ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
+  EXPECT_EQ(0, fclose(f));
+  EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));
+
+  {
+    WavReader r(outfile);
+    EXPECT_EQ(14099, r.sample_rate());
+    EXPECT_EQ(1u, r.num_channels());
+    EXPECT_EQ(kNumSamples, r.num_samples());
+    static const float kTruncatedSamples[] = {0.0, 10.0, 32767.0};
+    float samples[kNumSamples];
+    EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
+    EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
+    EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
+  }
+}
+
+// Write a larger WAV file. You can listen to this file to sanity-check it.
+TEST(WavWriterTest, LargeFile) {
+  constexpr int kSampleRate = 8000;
+  constexpr size_t kNumChannels = 2;
+  constexpr size_t kNumSamples = 3 * kSampleRate * kNumChannels;
+  for (WavFile::SampleFormat wav_format :
+       {WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
+    for (WavFile::SampleFormat write_format :
+         {WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
+      for (WavFile::SampleFormat read_format :
+           {WavFile::SampleFormat::kInt16, WavFile::SampleFormat::kFloat}) {
+        std::string outfile = test::OutputPath() + "wavtest3.wav";
+        float samples[kNumSamples];
+        for (size_t i = 0; i < kNumSamples; i += kNumChannels) {
+          // A nice periodic beeping sound.
+          static const double kToneHz = 440;
+          const double t =
+              static_cast<double>(i) / (kNumChannels * kSampleRate);
+          const double x = std::numeric_limits<int16_t>::max() *
+                           std::sin(t * kToneHz * 2 * M_PI);
+          samples[i] = std::pow(std::sin(t * 2 * 2 * M_PI), 10) * x;
+          samples[i + 1] = std::pow(std::cos(t * 2 * 2 * M_PI), 10) * x;
+        }
+        {
+          WavWriter w(outfile, kSampleRate, kNumChannels, wav_format);
+          EXPECT_EQ(kSampleRate, w.sample_rate());
+          EXPECT_EQ(kNumChannels, w.num_channels());
+          EXPECT_EQ(0u, w.num_samples());
+          if (write_format == WavFile::SampleFormat::kFloat) {
+            float truncated_samples[kNumSamples];
+            for (size_t k = 0; k < kNumSamples; ++k) {
+              truncated_samples[k] = static_cast<int16_t>(samples[k]);
+            }
+            w.WriteSamples(truncated_samples, kNumSamples);
+          } else {
+            w.WriteSamples(samples, kNumSamples);
+          }
+          EXPECT_EQ(kNumSamples, w.num_samples());
+        }
+        if (wav_format == WavFile::SampleFormat::kFloat) {
+          EXPECT_EQ(sizeof(float) * kNumSamples + kIeeeFloatWavHeaderSize,
+                    test::GetFileSize(outfile));
+        } else {
+          EXPECT_EQ(sizeof(int16_t) * kNumSamples + kPcmWavHeaderSize,
+                    test::GetFileSize(outfile));
+        }
+
+        {
+          WavReader r(outfile);
+          EXPECT_EQ(kSampleRate, r.sample_rate());
+          EXPECT_EQ(kNumChannels, r.num_channels());
+          EXPECT_EQ(kNumSamples, r.num_samples());
+
+          if (read_format == WavFile::SampleFormat::kFloat) {
+            float read_samples[kNumSamples];
+            EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, read_samples));
+            for (size_t i = 0; i < kNumSamples; ++i) {
+              EXPECT_NEAR(samples[i], read_samples[i], 1);
+            }
+            EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
+          } else {
+            int16_t read_samples[kNumSamples];
+            EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, read_samples));
+            for (size_t i = 0; i < kNumSamples; ++i) {
+              EXPECT_NEAR(samples[i], static_cast<float>(read_samples[i]), 1);
+            }
+            EXPECT_EQ(0u, r.ReadSamples(kNumSamples, read_samples));
+          }
+        }
+      }
+    }
+  }
+}
+
+// Write a tiny WAV file with the C++ interface then read-reset-read.
+TEST(WavReaderTest, MAYBE_CPPReset) {
+  const std::string outfile = test::OutputPath() + "wavtest4.wav";
+  static const size_t kNumSamples = 3;
+  {
+    WavWriter w(outfile, 14099, 1);
+    EXPECT_EQ(14099, w.sample_rate());
+    EXPECT_EQ(1u, w.num_channels());
+    EXPECT_EQ(0u, w.num_samples());
+    w.WriteSamples(kSamples, kNumSamples);
+    EXPECT_EQ(kNumSamples, w.num_samples());
+  }
+  // Write some extra "metadata" to the file that should be silently ignored
+  // by WavReader. We don't use WavWriter directly for this because it doesn't
+  // support metadata.
+  static const uint8_t kMetadata[] = {101, 202};
+  {
+    FILE* f = fopen(outfile.c_str(), "ab");
+    ASSERT_TRUE(f);
+    ASSERT_EQ(1u, fwrite(kMetadata, sizeof(kMetadata), 1, f));
+    fclose(f);
+  }
+  static const uint8_t kExpectedContents[] = {
+      // clang-format off
+      // clang formatting doesn't respect inline comments.
+    'R', 'I', 'F', 'F',
+    42, 0, 0, 0,  // size of whole file - 8: 6 + 44 - 8
+    'W', 'A', 'V', 'E',
+    'f', 'm', 't', ' ',
+    16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+    1, 0,  // format: PCM (1)
+    1, 0,  // channels: 1
+    0x13, 0x37, 0, 0,  // sample rate: 14099
+    0x26, 0x6e, 0, 0,  // byte rate: 2 * 14099
+    2, 0,  // block align: NumChannels * BytesPerSample
+    16, 0,  // bits per sample: 2 * 8
+    'd', 'a', 't', 'a',
+    6, 0, 0, 0,  // size of payload: 6
+    0, 0,  // first sample: 0.0
+    10, 0,  // second sample: 10.0
+    0xff, 0x7f,  // third sample: 4e4 (saturated)
+    kMetadata[0], kMetadata[1],
+      // clang-format on
+  };
+  static const size_t kContentSize =
+      kPcmWavHeaderSize + kNumSamples * sizeof(int16_t) + sizeof(kMetadata);
+  static_assert(sizeof(kExpectedContents) == kContentSize, "content size");
+  EXPECT_EQ(kContentSize, test::GetFileSize(outfile));
+  FILE* f = fopen(outfile.c_str(), "rb");
+  ASSERT_TRUE(f);
+  uint8_t contents[kContentSize];
+  ASSERT_EQ(1u, fread(contents, kContentSize, 1, f));
+  EXPECT_EQ(0, fclose(f));
+  EXPECT_EQ(0, memcmp(kExpectedContents, contents, kContentSize));
+
+  {
+    WavReader r(outfile);
+    EXPECT_EQ(14099, r.sample_rate());
+    EXPECT_EQ(1u, r.num_channels());
+    EXPECT_EQ(kNumSamples, r.num_samples());
+    static const float kTruncatedSamples[] = {0.0, 10.0, 32767.0};
+    float samples[kNumSamples];
+    EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
+    EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
+    EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
+
+    r.Reset();
+    EXPECT_EQ(kNumSamples, r.ReadSamples(kNumSamples, samples));
+    EXPECT_EQ(0, memcmp(kTruncatedSamples, samples, sizeof(samples)));
+    EXPECT_EQ(0u, r.ReadSamples(kNumSamples, samples));
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/wav_header.cc b/third_party/libwebrtc/common_audio/wav_header.cc
new file mode 100644
index 0000000000..bca209a665
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/wav_header.cc
@@ -0,0 +1,435 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Based on the WAV file format documentation at
+// https://ccrma.stanford.edu/courses/422/projects/WaveFormat/ and
+// http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
+
+#include "common_audio/wav_header.h"
+
+#include <cstring>
+#include <limits>
+#include <string>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/sanitizer.h"
+#include "rtc_base/system/arch.h"
+
+namespace webrtc {
+namespace {
+
+#ifndef WEBRTC_ARCH_LITTLE_ENDIAN
+#error "Code not working properly for big endian platforms."
+#endif
+
+#pragma pack(2)
+struct ChunkHeader {
+  uint32_t ID;
+  uint32_t Size;
+};
+static_assert(sizeof(ChunkHeader) == 8, "ChunkHeader size");
+
+#pragma pack(2)
+struct RiffHeader {
+  ChunkHeader header;
+  uint32_t Format;
+};
+static_assert(sizeof(RiffHeader) == sizeof(ChunkHeader) + 4, "RiffHeader size");
+
+// We can't nest this definition in WavHeader, because VS2013 gives an error
+// on sizeof(WavHeader::fmt): "error C2070: 'unknown': illegal sizeof operand".
+#pragma pack(2)
+struct FmtPcmSubchunk {
+  ChunkHeader header;
+  uint16_t AudioFormat;
+  uint16_t NumChannels;
+  uint32_t SampleRate;
+  uint32_t ByteRate;
+  uint16_t BlockAlign;
+  uint16_t BitsPerSample;
+};
+static_assert(sizeof(FmtPcmSubchunk) == 24, "FmtPcmSubchunk size");
+const uint32_t kFmtPcmSubchunkSize =
+    sizeof(FmtPcmSubchunk) - sizeof(ChunkHeader);
+
+// Pack struct to avoid additional padding bytes.
+#pragma pack(2)
+struct FmtIeeeFloatSubchunk {
+  ChunkHeader header;
+  uint16_t AudioFormat;
+  uint16_t NumChannels;
+  uint32_t SampleRate;
+  uint32_t ByteRate;
+  uint16_t BlockAlign;
+  uint16_t BitsPerSample;
+  uint16_t ExtensionSize;
+};
+static_assert(sizeof(FmtIeeeFloatSubchunk) == 26, "FmtIeeeFloatSubchunk size");
+const uint32_t kFmtIeeeFloatSubchunkSize =
+    sizeof(FmtIeeeFloatSubchunk) - sizeof(ChunkHeader);
+
+// Simple PCM wav header. It does not include chunks that are not essential to
+// read audio samples.
+#pragma pack(2)
+struct WavHeaderPcm {
+  RiffHeader riff;
+  FmtPcmSubchunk fmt;
+  struct {
+    ChunkHeader header;
+  } data;
+};
+static_assert(sizeof(WavHeaderPcm) == kPcmWavHeaderSize,
+              "no padding in header");
+
+// IEEE Float Wav header, includes extra chunks necessary for proper non-PCM
+// WAV implementation.
+#pragma pack(2)
+struct WavHeaderIeeeFloat {
+  RiffHeader riff;
+  FmtIeeeFloatSubchunk fmt;
+  struct {
+    ChunkHeader header;
+    uint32_t SampleLength;
+  } fact;
+  struct {
+    ChunkHeader header;
+  } data;
+};
+static_assert(sizeof(WavHeaderIeeeFloat) == kIeeeFloatWavHeaderSize,
+              "no padding in header");
+
+uint32_t PackFourCC(char a, char b, char c, char d) {
+  uint32_t packed_value =
+      static_cast<uint32_t>(a) | static_cast<uint32_t>(b) << 8 |
+      static_cast<uint32_t>(c) << 16 | static_cast<uint32_t>(d) << 24;
+  return packed_value;
+}
+
+std::string ReadFourCC(uint32_t x) {
+  return std::string(reinterpret_cast<char*>(&x), 4);
+}
+
+uint16_t MapWavFormatToHeaderField(WavFormat format) {
+  switch (format) {
+    case WavFormat::kWavFormatPcm:
+      return 1;
+    case WavFormat::kWavFormatIeeeFloat:
+      return 3;
+    case WavFormat::kWavFormatALaw:
+      return 6;
+    case WavFormat::kWavFormatMuLaw:
+      return 7;
+  }
+  RTC_CHECK_NOTREACHED();
+}
+
+WavFormat MapHeaderFieldToWavFormat(uint16_t format_header_value) {
+  if (format_header_value == 1) {
+    return WavFormat::kWavFormatPcm;
+  }
+  if (format_header_value == 3) {
+    return WavFormat::kWavFormatIeeeFloat;
+  }
+
+  RTC_CHECK(false) << "Unsupported WAV format";
+}
+
+uint32_t RiffChunkSize(size_t bytes_in_payload, size_t header_size) {
+  return static_cast<uint32_t>(bytes_in_payload + header_size -
+                               sizeof(ChunkHeader));
+}
+
+uint32_t ByteRate(size_t num_channels,
+                  int sample_rate,
+                  size_t bytes_per_sample) {
+  return static_cast<uint32_t>(num_channels * sample_rate * bytes_per_sample);
+}
+
+uint16_t BlockAlign(size_t num_channels, size_t bytes_per_sample) {
+  return static_cast<uint16_t>(num_channels * bytes_per_sample);
+}
+
+// Finds a chunk having the sought ID. If found, then `readable` points to the
+// first byte of the sought chunk data. If not found, the end of the file is
+// reached.
+bool FindWaveChunk(ChunkHeader* chunk_header,
+                   WavHeaderReader* readable,
+                   const std::string sought_chunk_id) {
+  RTC_DCHECK_EQ(sought_chunk_id.size(), 4);
+  while (true) {
+    if (readable->Read(chunk_header, sizeof(*chunk_header)) !=
+        sizeof(*chunk_header))
+      return false;  // EOF.
+    if (ReadFourCC(chunk_header->ID) == sought_chunk_id)
+      return true;  // Sought chunk found.
+    // Ignore current chunk by skipping its payload.
+    if (!readable->SeekForward(chunk_header->Size))
+      return false;  // EOF or error.
+  }
+}
+
+bool ReadFmtChunkData(FmtPcmSubchunk* fmt_subchunk, WavHeaderReader* readable) {
+  // Reads "fmt " chunk payload.
+  if (readable->Read(&(fmt_subchunk->AudioFormat), kFmtPcmSubchunkSize) !=
+      kFmtPcmSubchunkSize)
+    return false;
+  const uint32_t fmt_size = fmt_subchunk->header.Size;
+  if (fmt_size != kFmtPcmSubchunkSize) {
+    // There is an optional two-byte extension field permitted to be present
+    // with PCM, but which must be zero.
+    int16_t ext_size;
+    if (kFmtPcmSubchunkSize + sizeof(ext_size) != fmt_size)
+      return false;
+    if (readable->Read(&ext_size, sizeof(ext_size)) != sizeof(ext_size))
+      return false;
+    if (ext_size != 0)
+      return false;
+  }
+  return true;
+}
+
+void WritePcmWavHeader(size_t num_channels,
+                       int sample_rate,
+                       size_t bytes_per_sample,
+                       size_t num_samples,
+                       uint8_t* buf,
+                       size_t* header_size) {
+  RTC_CHECK(buf);
+  RTC_CHECK(header_size);
+  *header_size = kPcmWavHeaderSize;
+  auto header = rtc::MsanUninitialized<WavHeaderPcm>({});
+  const size_t bytes_in_payload = bytes_per_sample * num_samples;
+
+  header.riff.header.ID = PackFourCC('R', 'I', 'F', 'F');
+  header.riff.header.Size = RiffChunkSize(bytes_in_payload, *header_size);
+  header.riff.Format = PackFourCC('W', 'A', 'V', 'E');
+  header.fmt.header.ID = PackFourCC('f', 'm', 't', ' ');
+  header.fmt.header.Size = kFmtPcmSubchunkSize;
+  header.fmt.AudioFormat = MapWavFormatToHeaderField(WavFormat::kWavFormatPcm);
+  header.fmt.NumChannels = static_cast<uint16_t>(num_channels);
+  header.fmt.SampleRate = sample_rate;
+  header.fmt.ByteRate = ByteRate(num_channels, sample_rate, bytes_per_sample);
+  header.fmt.BlockAlign = BlockAlign(num_channels, bytes_per_sample);
+  header.fmt.BitsPerSample = static_cast<uint16_t>(8 * bytes_per_sample);
+  header.data.header.ID = PackFourCC('d', 'a', 't', 'a');
+  header.data.header.Size = static_cast<uint32_t>(bytes_in_payload);
+
+  // Do an extra copy rather than writing everything to buf directly, since buf
+  // might not be correctly aligned.
+  memcpy(buf, &header, *header_size);
+}
+
+void WriteIeeeFloatWavHeader(size_t num_channels,
+                             int sample_rate,
+                             size_t bytes_per_sample,
+                             size_t num_samples,
+                             uint8_t* buf,
+                             size_t* header_size) {
+  RTC_CHECK(buf);
+  RTC_CHECK(header_size);
+  *header_size = kIeeeFloatWavHeaderSize;
+  auto header = rtc::MsanUninitialized<WavHeaderIeeeFloat>({});
+  const size_t bytes_in_payload = bytes_per_sample * num_samples;
+
+  header.riff.header.ID = PackFourCC('R', 'I', 'F', 'F');
+  header.riff.header.Size = RiffChunkSize(bytes_in_payload, *header_size);
+  header.riff.Format = PackFourCC('W', 'A', 'V', 'E');
+  header.fmt.header.ID = PackFourCC('f', 'm', 't', ' ');
+  header.fmt.header.Size = kFmtIeeeFloatSubchunkSize;
+  header.fmt.AudioFormat =
+      MapWavFormatToHeaderField(WavFormat::kWavFormatIeeeFloat);
+  header.fmt.NumChannels = static_cast<uint16_t>(num_channels);
+  header.fmt.SampleRate = sample_rate;
+  header.fmt.ByteRate = ByteRate(num_channels, sample_rate, bytes_per_sample);
+  header.fmt.BlockAlign = BlockAlign(num_channels, bytes_per_sample);
+  header.fmt.BitsPerSample = static_cast<uint16_t>(8 * bytes_per_sample);
+  header.fmt.ExtensionSize = 0;
+  header.fact.header.ID = PackFourCC('f', 'a', 'c', 't');
+  header.fact.header.Size = 4;
+  header.fact.SampleLength = static_cast<uint32_t>(num_channels * num_samples);
+  header.data.header.ID = PackFourCC('d', 'a', 't', 'a');
+  header.data.header.Size = static_cast<uint32_t>(bytes_in_payload);
+
+  // Do an extra copy rather than writing everything to buf directly, since buf
+  // might not be correctly aligned.
+  memcpy(buf, &header, *header_size);
+}
+
+// Returns the number of bytes per sample for the format.
+size_t GetFormatBytesPerSample(WavFormat format) {
+  switch (format) {
+    case WavFormat::kWavFormatPcm:
+      // Other values may be OK, but for now we're conservative.
+      return 2;
+    case WavFormat::kWavFormatALaw:
+    case WavFormat::kWavFormatMuLaw:
+      return 1;
+    case WavFormat::kWavFormatIeeeFloat:
+      return 4;
+  }
+  RTC_CHECK_NOTREACHED();
+}
+
+bool CheckWavParameters(size_t num_channels,
+                        int sample_rate,
+                        WavFormat format,
+                        size_t bytes_per_sample,
+                        size_t num_samples) {
+  // num_channels, sample_rate, and bytes_per_sample must be positive, must fit
+  // in their respective fields, and their product must fit in the 32-bit
+  // ByteRate field.
+  if (num_channels == 0 || sample_rate <= 0 || bytes_per_sample == 0)
+    return false;
+  if (static_cast<uint64_t>(sample_rate) > std::numeric_limits<uint32_t>::max())
+    return false;
+  if (num_channels > std::numeric_limits<uint16_t>::max())
+    return false;
+  if (static_cast<uint64_t>(bytes_per_sample) * 8 >
+      std::numeric_limits<uint16_t>::max())
+    return false;
+  if (static_cast<uint64_t>(sample_rate) * num_channels * bytes_per_sample >
+      std::numeric_limits<uint32_t>::max())
+    return false;
+
+  // format and bytes_per_sample must agree.
+  switch (format) {
+    case WavFormat::kWavFormatPcm:
+      // Other values may be OK, but for now we're conservative:
+      if (bytes_per_sample != 1 && bytes_per_sample != 2)
+        return false;
+      break;
+    case WavFormat::kWavFormatALaw:
+    case WavFormat::kWavFormatMuLaw:
+      if (bytes_per_sample != 1)
+        return false;
+      break;
+    case WavFormat::kWavFormatIeeeFloat:
+      if (bytes_per_sample != 4)
+        return false;
+      break;
+    default:
+      return false;
+  }
+
+  // The number of bytes in the file, not counting the first ChunkHeader, must
+  // be less than 2^32; otherwise, the ChunkSize field overflows.
+  const size_t header_size = kPcmWavHeaderSize - sizeof(ChunkHeader);
+  const size_t max_samples =
+      (std::numeric_limits<uint32_t>::max() - header_size) / bytes_per_sample;
+  if (num_samples > max_samples)
+    return false;
+
+  // Each channel must have the same number of samples.
+  if (num_samples % num_channels != 0)
+    return false;
+
+  return true;
+}
+
+}  // namespace
+
+bool CheckWavParameters(size_t num_channels,
+                        int sample_rate,
+                        WavFormat format,
+                        size_t num_samples) {
+  return CheckWavParameters(num_channels, sample_rate, format,
+                            GetFormatBytesPerSample(format), num_samples);
+}
+
+void WriteWavHeader(size_t num_channels,
+                    int sample_rate,
+                    WavFormat format,
+                    size_t num_samples,
+                    uint8_t* buf,
+                    size_t* header_size) {
+  RTC_CHECK(buf);
+  RTC_CHECK(header_size);
+
+  const size_t bytes_per_sample = GetFormatBytesPerSample(format);
+  RTC_CHECK(CheckWavParameters(num_channels, sample_rate, format,
+                               bytes_per_sample, num_samples));
+  if (format == WavFormat::kWavFormatPcm) {
+    WritePcmWavHeader(num_channels, sample_rate, bytes_per_sample, num_samples,
+                      buf, header_size);
+  } else {
+    RTC_CHECK_EQ(format, WavFormat::kWavFormatIeeeFloat);
+    WriteIeeeFloatWavHeader(num_channels, sample_rate, bytes_per_sample,
+                            num_samples, buf, header_size);
+  }
+}
+
+bool ReadWavHeader(WavHeaderReader* readable,
+                   size_t* num_channels,
+                   int* sample_rate,
+                   WavFormat* format,
+                   size_t* bytes_per_sample,
+                   size_t* num_samples,
+                   int64_t* data_start_pos) {
+  // Read using the PCM header, even though it might be float Wav file
+  auto header = rtc::MsanUninitialized<WavHeaderPcm>({});
+
+  // Read RIFF chunk.
+  if (readable->Read(&header.riff, sizeof(header.riff)) != sizeof(header.riff))
+    return false;
+  if (ReadFourCC(header.riff.header.ID) != "RIFF")
+    return false;
+  if (ReadFourCC(header.riff.Format) != "WAVE")
+    return false;
+
+  // Find "fmt " and "data" chunks. While the official Wave file specification
+  // does not put requirements on the chunks order, it is uncommon to find the
+  // "data" chunk before the "fmt " one. The code below fails if this is not the
+  // case.
+  if (!FindWaveChunk(&header.fmt.header, readable, "fmt ")) {
+    RTC_LOG(LS_ERROR) << "Cannot find 'fmt ' chunk.";
+    return false;
+  }
+  if (!ReadFmtChunkData(&header.fmt, readable)) {
+    RTC_LOG(LS_ERROR) << "Cannot read 'fmt ' chunk.";
+    return false;
+  }
+  if (!FindWaveChunk(&header.data.header, readable, "data")) {
+    RTC_LOG(LS_ERROR) << "Cannot find 'data' chunk.";
+    return false;
+  }
+
+  // Parse needed fields.
+  *format = MapHeaderFieldToWavFormat(header.fmt.AudioFormat);
+  *num_channels = header.fmt.NumChannels;
+  *sample_rate = header.fmt.SampleRate;
+  *bytes_per_sample = header.fmt.BitsPerSample / 8;
+  const size_t bytes_in_payload = header.data.header.Size;
+  if (*bytes_per_sample == 0)
+    return false;
+  *num_samples = bytes_in_payload / *bytes_per_sample;
+
+  const size_t header_size = *format == WavFormat::kWavFormatPcm
+                                 ? kPcmWavHeaderSize
+                                 : kIeeeFloatWavHeaderSize;
+
+  if (header.riff.header.Size < RiffChunkSize(bytes_in_payload, header_size))
+    return false;
+  if (header.fmt.ByteRate !=
+      ByteRate(*num_channels, *sample_rate, *bytes_per_sample))
+    return false;
+  if (header.fmt.BlockAlign != BlockAlign(*num_channels, *bytes_per_sample))
+    return false;
+
+  if (!CheckWavParameters(*num_channels, *sample_rate, *format,
+                          *bytes_per_sample, *num_samples)) {
+    return false;
+  }
+
+  *data_start_pos = readable->GetPosition();
+  return true;
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/wav_header.h b/third_party/libwebrtc/common_audio/wav_header.h
new file mode 100644
index 0000000000..a1aa942a3d
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/wav_header.h
@@ -0,0 +1,91 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_WAV_HEADER_H_
+#define COMMON_AUDIO_WAV_HEADER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <algorithm>
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+// Interface providing header reading functionality.
+class WavHeaderReader {
+ public:
+  // Returns the number of bytes read.
+  virtual size_t Read(void* buf, size_t num_bytes) = 0;
+  virtual bool SeekForward(uint32_t num_bytes) = 0;
+  virtual ~WavHeaderReader() = default;
+  virtual int64_t GetPosition() = 0;
+};
+
+// Possible WAV formats.
+enum class WavFormat {
+  kWavFormatPcm = 1,        // PCM, each sample of size bytes_per_sample.
+  kWavFormatIeeeFloat = 3,  // IEEE float.
+  kWavFormatALaw = 6,       // 8-bit ITU-T G.711 A-law.
+  kWavFormatMuLaw = 7,      // 8-bit ITU-T G.711 mu-law.
+};
+
+// Header sizes for supported WAV formats.
+constexpr size_t kPcmWavHeaderSize = 44;
+constexpr size_t kIeeeFloatWavHeaderSize = 58;
+
+// Returns the size of the WAV header for the specified format.
+constexpr size_t WavHeaderSize(WavFormat format) {
+  if (format == WavFormat::kWavFormatPcm) {
+    return kPcmWavHeaderSize;
+  }
+  RTC_CHECK_EQ(format, WavFormat::kWavFormatIeeeFloat);
+  return kIeeeFloatWavHeaderSize;
+}
+
+// Returns the maximum size of the supported WAV formats.
+constexpr size_t MaxWavHeaderSize() {
+  return std::max(WavHeaderSize(WavFormat::kWavFormatPcm),
+                  WavHeaderSize(WavFormat::kWavFormatIeeeFloat));
+}
+
+// Return true if the given parameters will make a well-formed WAV header.
+bool CheckWavParameters(size_t num_channels,
+                        int sample_rate,
+                        WavFormat format,
+                        size_t num_samples);
+
+// Write a kWavHeaderSize bytes long WAV header to buf. The payload that
+// follows the header is supposed to have the specified number of interleaved
+// channels and contain the specified total number of samples of the specified
+// type. The size of the header is returned in header_size. CHECKs the input
+// parameters for validity.
+void WriteWavHeader(size_t num_channels,
+                    int sample_rate,
+                    WavFormat format,
+                    size_t num_samples,
+                    uint8_t* buf,
+                    size_t* header_size);
+
+// Read a WAV header from an implemented WavHeaderReader and parse the values
+// into the provided output parameters. WavHeaderReader is used because the
+// header can be variably sized. Returns false if the header is invalid.
+bool ReadWavHeader(WavHeaderReader* readable,
+                   size_t* num_channels,
+                   int* sample_rate,
+                   WavFormat* format,
+                   size_t* bytes_per_sample,
+                   size_t* num_samples,
+                   int64_t* data_start_pos);
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_WAV_HEADER_H_
diff --git a/third_party/libwebrtc/common_audio/wav_header_unittest.cc b/third_party/libwebrtc/common_audio/wav_header_unittest.cc
new file mode 100644
index 0000000000..95721dac65
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/wav_header_unittest.cc
@@ -0,0 +1,447 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/wav_header.h"
+
+#include <string.h>
+
+#include <limits>
+
+#include "test/gtest.h"
+
+namespace webrtc {
+
+// Doesn't take ownership of the buffer.
+class WavHeaderBufferReader : public WavHeaderReader {
+ public:
+  WavHeaderBufferReader(const uint8_t* buf, size_t size, bool check_read_size)
+      : buf_(buf),
+        size_(size),
+        pos_(0),
+        buf_exhausted_(false),
+        check_read_size_(check_read_size) {}
+
+  ~WavHeaderBufferReader() override {
+    // Verify the entire buffer has been read.
+    if (check_read_size_)
+      EXPECT_EQ(size_, pos_);
+  }
+
+  size_t Read(void* buf, size_t num_bytes) override {
+    EXPECT_FALSE(buf_exhausted_);
+
+    const size_t bytes_remaining = size_ - pos_;
+    if (num_bytes > bytes_remaining) {
+      // The caller is signalled about an exhausted buffer when we return fewer
+      // bytes than requested. There should not be another read attempt after
+      // this point.
+      buf_exhausted_ = true;
+      num_bytes = bytes_remaining;
+    }
+    memcpy(buf, &buf_[pos_], num_bytes);
+    pos_ += num_bytes;
+    return num_bytes;
+  }
+
+  bool SeekForward(uint32_t num_bytes) override {
+    // Verify we don't try to read outside of a properly sized header.
+    if (size_ >= kPcmWavHeaderSize)
+      EXPECT_GE(size_, pos_ + num_bytes);
+    EXPECT_FALSE(buf_exhausted_);
+
+    const size_t bytes_remaining = size_ - pos_;
+    if (num_bytes > bytes_remaining) {
+      // Error: cannot seek beyond EOF.
+      return false;
+    }
+    if (num_bytes == bytes_remaining) {
+      // There should not be another read attempt after this point.
+      buf_exhausted_ = true;
+    }
+    pos_ += num_bytes;
+    return true;
+  }
+
+  int64_t GetPosition() override { return pos_; }
+
+ private:
+  const uint8_t* buf_;
+  const size_t size_;
+  size_t pos_;
+  bool buf_exhausted_;
+  const bool check_read_size_;
+};
+
+// Try various choices of WAV header parameters, and make sure that the good
+// ones are accepted and the bad ones rejected.
+TEST(WavHeaderTest, CheckWavParameters) {
+  // Try some really stupid values for one parameter at a time.
+  EXPECT_TRUE(CheckWavParameters(1, 8000, WavFormat::kWavFormatPcm, 0));
+  EXPECT_FALSE(CheckWavParameters(0, 8000, WavFormat::kWavFormatPcm, 0));
+  EXPECT_FALSE(CheckWavParameters(0x10000, 8000, WavFormat::kWavFormatPcm, 0));
+  EXPECT_FALSE(CheckWavParameters(1, 0, WavFormat::kWavFormatPcm, 0));
+
+  // Too large values.
+  EXPECT_FALSE(
+      CheckWavParameters(1 << 20, 1 << 20, WavFormat::kWavFormatPcm, 0));
+  EXPECT_FALSE(CheckWavParameters(1, 8000, WavFormat::kWavFormatPcm,
+                                  std::numeric_limits<uint32_t>::max()));
+
+  // Not the same number of samples for each channel.
+  EXPECT_FALSE(CheckWavParameters(3, 8000, WavFormat::kWavFormatPcm, 5));
+}
+
+TEST(WavHeaderTest, ReadWavHeaderWithErrors) {
+  size_t num_channels = 0;
+  int sample_rate = 0;
+  WavFormat format = WavFormat::kWavFormatPcm;
+  size_t bytes_per_sample = 0;
+  size_t num_samples = 0;
+  int64_t data_start_pos = 0;
+
+  // Test a few ways the header can be invalid. We start with the valid header
+  // used in WriteAndReadWavHeader, and invalidate one field per test. The
+  // invalid field is indicated in the array name, and in the comments with
+  // *BAD*.
+  {
+    constexpr uint8_t kBadRiffID[] = {
+        // clang-format off
+        // clang formatting doesn't respect inline comments.
+      'R', 'i', 'f', 'f',  // *BAD*
+      0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
+      'W', 'A', 'V', 'E',
+      'f', 'm', 't', ' ',
+      16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+      1, 0,  // format: PCM (1)
+      17, 0,  // channels: 17
+      0x39, 0x30, 0, 0,  // sample rate: 12345
+      0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
+      17, 0,  // block align: NumChannels * BytesPerSample
+      8, 0,  // bits per sample: 1 * 8
+      'd', 'a', 't', 'a',
+      0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
+        // clang-format on
+    };
+    WavHeaderBufferReader r(kBadRiffID, sizeof(kBadRiffID),
+                            /*check_read_size=*/false);
+    EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                               &bytes_per_sample, &num_samples,
+                               &data_start_pos));
+  }
+  {
+    constexpr uint8_t kBadBitsPerSample[] = {
+        // clang-format off
+        // clang formatting doesn't respect inline comments.
+      'R', 'I', 'F', 'F',
+      0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
+      'W', 'A', 'V', 'E',
+      'f', 'm', 't', ' ',
+      16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+      1, 0,  // format: PCM (1)
+      17, 0,  // channels: 17
+      0x39, 0x30, 0, 0,  // sample rate: 12345
+      0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
+      17, 0,  // block align: NumChannels * BytesPerSample
+      1, 0,  // bits per sample: *BAD*
+      'd', 'a', 't', 'a',
+      0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
+        // clang-format on
+    };
+    WavHeaderBufferReader r(kBadBitsPerSample, sizeof(kBadBitsPerSample),
+                            /*check_read_size=*/true);
+    EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                               &bytes_per_sample, &num_samples,
+                               &data_start_pos));
+  }
+  {
+    constexpr uint8_t kBadByteRate[] = {
+        // clang-format off
+        // clang formatting doesn't respect inline comments.
+      'R', 'I', 'F', 'F',
+      0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
+      'W', 'A', 'V', 'E',
+      'f', 'm', 't', ' ',
+      16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+      1, 0,  // format: PCM (1)
+      17, 0,  // channels: 17
+      0x39, 0x30, 0, 0,  // sample rate: 12345
+      0x00, 0x33, 0x03, 0,  // byte rate: *BAD*
+      17, 0,  // block align: NumChannels * BytesPerSample
+      8, 0,  // bits per sample: 1 * 8
+      'd', 'a', 't', 'a',
+      0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
+        // clang-format on
+    };
+    WavHeaderBufferReader r(kBadByteRate, sizeof(kBadByteRate),
+                            /*check_read_size=*/true);
+    EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                               &bytes_per_sample, &num_samples,
+                               &data_start_pos));
+  }
+  {
+    constexpr uint8_t kBadFmtHeaderSize[] = {
+        // clang-format off
+        // clang formatting doesn't respect inline comments.
+      'R', 'I', 'F', 'F',
+      0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
+      'W', 'A', 'V', 'E',
+      'f', 'm', 't', ' ',
+      17, 0, 0, 0,  // size of fmt block *BAD*. Only 16 and 18 permitted.
+      1, 0,  // format: PCM (1)
+      17, 0,  // channels: 17
+      0x39, 0x30, 0, 0,  // sample rate: 12345
+      0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
+      17, 0,  // block align: NumChannels * BytesPerSample
+      8, 0,  // bits per sample: 1 * 8
+      0,  // extra (though invalid) header byte
+      'd', 'a', 't', 'a',
+      0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
+        // clang-format on
+    };
+    WavHeaderBufferReader r(kBadFmtHeaderSize, sizeof(kBadFmtHeaderSize),
+                            /*check_read_size=*/false);
+    EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                               &bytes_per_sample, &num_samples,
+                               &data_start_pos));
+  }
+  {
+    constexpr uint8_t kNonZeroExtensionField[] = {
+        // clang-format off
+        // clang formatting doesn't respect inline comments.
+      'R', 'I', 'F', 'F',
+      0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
+      'W', 'A', 'V', 'E',
+      'f', 'm', 't', ' ',
+      18, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+      1, 0,  // format: PCM (1)
+      17, 0,  // channels: 17
+      0x39, 0x30, 0, 0,  // sample rate: 12345
+      0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
+      17, 0,  // block align: NumChannels * BytesPerSample
+      8, 0,  // bits per sample: 1 * 8
+      1, 0,  // non-zero extension field *BAD*
+      'd', 'a', 't', 'a',
+      0x99, 0xd0, 0x5b, 0x07,  // size of payload: 123457689
+        // clang-format on
+    };
+    WavHeaderBufferReader r(kNonZeroExtensionField,
+                            sizeof(kNonZeroExtensionField),
+                            /*check_read_size=*/false);
+    EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                               &bytes_per_sample, &num_samples,
+                               &data_start_pos));
+  }
+  {
+    constexpr uint8_t kMissingDataChunk[] = {
+        // clang-format off
+        // clang formatting doesn't respect inline comments.
+      'R', 'I', 'F', 'F',
+      0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
+      'W', 'A', 'V', 'E',
+      'f', 'm', 't', ' ',
+      16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+      1, 0,  // format: PCM (1)
+      17, 0,  // channels: 17
+      0x39, 0x30, 0, 0,  // sample rate: 12345
+      0xc9, 0x33, 0x03, 0,  // byte rate: 1 * 17 * 12345
+      17, 0,  // block align: NumChannels * BytesPerSample
+      8, 0,  // bits per sample: 1 * 8
+        // clang-format on
+    };
+    WavHeaderBufferReader r(kMissingDataChunk, sizeof(kMissingDataChunk),
+                            /*check_read_size=*/true);
+    EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                               &bytes_per_sample, &num_samples,
+                               &data_start_pos));
+  }
+  {
+    constexpr uint8_t kMissingFmtAndDataChunks[] = {
+        // clang-format off
+        // clang formatting doesn't respect inline comments.
+      'R', 'I', 'F', 'F',
+      0xbd, 0xd0, 0x5b, 0x07,  // size of whole file - 8: 123457689 + 44 - 8
+      'W', 'A', 'V', 'E',
+        // clang-format on
+    };
+    WavHeaderBufferReader r(kMissingFmtAndDataChunks,
+                            sizeof(kMissingFmtAndDataChunks),
+                            /*check_read_size=*/true);
+    EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                               &bytes_per_sample, &num_samples,
+                               &data_start_pos));
+  }
+}
+
+// Try writing and reading a valid WAV header and make sure it looks OK.
+TEST(WavHeaderTest, WriteAndReadWavHeader) {
+  constexpr int kSize = 4 + kPcmWavHeaderSize + 4;
+  uint8_t buf[kSize];
+  size_t header_size;
+  memset(buf, 0xa4, sizeof(buf));
+  WriteWavHeader(17, 12345, WavFormat::kWavFormatPcm, 123457689, buf + 4,
+                 &header_size);
+  constexpr uint8_t kExpectedBuf[] = {
+      // clang-format off
+    // clang formatting doesn't respect inline comments.
+    0xa4, 0xa4, 0xa4, 0xa4,  // untouched bytes before header
+    'R', 'I', 'F', 'F',
+    0x56, 0xa1, 0xb7, 0x0e,  // size of whole file - 8: 123457689 + 44 - 8
+    'W', 'A', 'V', 'E',
+    'f', 'm', 't', ' ',
+    16, 0, 0, 0,  // size of fmt block - 8: 24 - 8
+    1, 0,  // format: PCM (1)
+    17, 0,  // channels: 17
+    0x39, 0x30, 0, 0,  // sample rate: 12345
+    0x92, 0x67, 0x06, 0,  // byte rate: 2 * 17 * 12345
+    34, 0,  // block align: NumChannels * BytesPerSample
+    16, 0,  // bits per sample: 2 * 8
+    'd', 'a', 't', 'a',
+    0x32, 0xa1, 0xb7, 0x0e,  // size of payload: 2 * 123457689
+    0xa4, 0xa4, 0xa4, 0xa4,  // untouched bytes after header
+      // clang-format on
+  };
+  static_assert(sizeof(kExpectedBuf) == kSize, "buffer size");
+  EXPECT_EQ(0, memcmp(kExpectedBuf, buf, kSize));
+
+  size_t num_channels = 0;
+  int sample_rate = 0;
+  WavFormat format = WavFormat::kWavFormatPcm;
+  size_t bytes_per_sample = 0;
+  size_t num_samples = 0;
+  int64_t data_start_pos = 0;
+  WavHeaderBufferReader r(buf + 4, sizeof(buf) - 8,
+                          /*check_read_size=*/true);
+  EXPECT_TRUE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                            &bytes_per_sample, &num_samples, &data_start_pos));
+  EXPECT_EQ(17u, num_channels);
+  EXPECT_EQ(12345, sample_rate);
+  EXPECT_EQ(WavFormat::kWavFormatPcm, format);
+  EXPECT_EQ(2u, bytes_per_sample);
+  EXPECT_EQ(123457689u, num_samples);
+}
+
+// Try reading an atypical but valid WAV header and make sure it's parsed OK.
+TEST(WavHeaderTest, ReadAtypicalWavHeader) {
+  constexpr uint8_t kBuf[] = {
+      // clang-format off
+      // clang formatting doesn't respect inline comments.
+    'R', 'I', 'F', 'F',
+    0xbf, 0xd0, 0x5b, 0x07,  // Size of whole file - 8 + extra 2 bytes of zero
+                             // extension: 123457689 + 44 - 8 + 2 (atypical).
+    'W', 'A', 'V', 'E',
+    'f', 'm', 't', ' ',
+    18, 0, 0, 0,             // Size of fmt block (with an atypical extension
+                             // size field).
+    1, 0,                    // Format: PCM (1).
+    17, 0,                   // Channels: 17.
+    0x39, 0x30, 0, 0,        // Sample rate: 12345.
+    0xc9, 0x33, 0x03, 0,     // Byte rate: 1 * 17 * 12345.
+    17, 0,                   // Block align: NumChannels * BytesPerSample.
+    8, 0,                    // Bits per sample: 1 * 8.
+    0, 0,                    // Zero extension size field (atypical).
+    'd', 'a', 't', 'a',
+    0x99, 0xd0, 0x5b, 0x07,  // Size of payload: 123457689.
+      // clang-format on
+  };
+
+  size_t num_channels = 0;
+  int sample_rate = 0;
+  WavFormat format = WavFormat::kWavFormatPcm;
+  size_t bytes_per_sample = 0;
+  size_t num_samples = 0;
+  int64_t data_start_pos = 0;
+  WavHeaderBufferReader r(kBuf, sizeof(kBuf), /*check_read_size=*/true);
+  EXPECT_TRUE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                            &bytes_per_sample, &num_samples, &data_start_pos));
+  EXPECT_EQ(17u, num_channels);
+  EXPECT_EQ(12345, sample_rate);
+  EXPECT_EQ(WavFormat::kWavFormatPcm, format);
+  EXPECT_EQ(1u, bytes_per_sample);
+  EXPECT_EQ(123457689u, num_samples);
+}
+
+// Try reading a valid WAV header which contains an optional chunk and make sure
+// it's parsed OK.
+TEST(WavHeaderTest, ReadWavHeaderWithOptionalChunk) {
+  constexpr uint8_t kBuf[] = {
+      // clang-format off
+      // clang formatting doesn't respect inline comments.
+    'R', 'I', 'F', 'F',
+    0xcd, 0xd0, 0x5b, 0x07,  // Size of whole file - 8 + an extra 16 bytes of
+                             // "metadata" (8 bytes header, 16 bytes payload):
+                             // 123457689 + 44 - 8 + 16.
+    'W', 'A', 'V', 'E',
+    'f', 'm', 't', ' ',
+    16, 0, 0, 0,             // Size of fmt block.
+    1, 0,                    // Format: PCM (1).
+    17, 0,                   // Channels: 17.
+    0x39, 0x30, 0, 0,        // Sample rate: 12345.
+    0xc9, 0x33, 0x03, 0,     // Byte rate: 1 * 17 * 12345.
+    17, 0,                   // Block align: NumChannels * BytesPerSample.
+    8, 0,                    // Bits per sample: 1 * 8.
+    'L', 'I', 'S', 'T',      // Metadata chunk ID.
+    16, 0, 0, 0,             // Metadata chunk payload size.
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // Metadata (16 bytes).
+    'd', 'a', 't', 'a',
+    0x99, 0xd0, 0x5b, 0x07,  // Size of payload: 123457689.
+      // clang-format on
+  };
+
+  size_t num_channels = 0;
+  int sample_rate = 0;
+  WavFormat format = WavFormat::kWavFormatPcm;
+  size_t bytes_per_sample = 0;
+  size_t num_samples = 0;
+  int64_t data_start_pos = 0;
+  WavHeaderBufferReader r(kBuf, sizeof(kBuf), /*check_read_size=*/true);
+  EXPECT_TRUE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                            &bytes_per_sample, &num_samples, &data_start_pos));
+  EXPECT_EQ(17u, num_channels);
+  EXPECT_EQ(12345, sample_rate);
+  EXPECT_EQ(WavFormat::kWavFormatPcm, format);
+  EXPECT_EQ(1u, bytes_per_sample);
+  EXPECT_EQ(123457689u, num_samples);
+}
+
+// Try reading an invalid WAV header which has the the data chunk before the
+// format one and make sure it's not parsed.
+TEST(WavHeaderTest, ReadWavHeaderWithDataBeforeFormat) {
+  constexpr uint8_t kBuf[] = {
+      // clang-format off
+      // clang formatting doesn't respect inline comments.
+    'R', 'I', 'F', 'F',
+    52,  0,   0,   0,    // Size of whole file - 8: 16 + 44 - 8.
+    'W', 'A', 'V', 'E',
+    'd', 'a', 't', 'a',
+    16, 0, 0, 0,         // Data chunk payload size.
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // Data 16 bytes.
+    'f', 'm', 't', ' ',
+    16,  0,   0,   0,    // Size of fmt block.
+    1,   0,              // Format: Pcm (1).
+    1,   0,              // Channels: 1.
+    60,  0,   0,   0,    // Sample rate: 60.
+    60,  0,   0,   0,    // Byte rate: 1 * 1 * 60.
+    1,   0,              // Block align: NumChannels * BytesPerSample.
+    8,   0,              // Bits per sample: 1 * 8.
+      // clang-format on
+  };
+
+  size_t num_channels = 0;
+  int sample_rate = 0;
+  WavFormat format = WavFormat::kWavFormatPcm;
+  size_t bytes_per_sample = 0;
+  size_t num_samples = 0;
+  int64_t data_start_pos = 0;
+  WavHeaderBufferReader r(kBuf, sizeof(kBuf), /*check_read_size=*/false);
+  EXPECT_FALSE(ReadWavHeader(&r, &num_channels, &sample_rate, &format,
+                             &bytes_per_sample, &num_samples, &data_start_pos));
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/window_generator.cc b/third_party/libwebrtc/common_audio/window_generator.cc
new file mode 100644
index 0000000000..da5603d9e7
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/window_generator.cc
@@ -0,0 +1,71 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#define _USE_MATH_DEFINES
+
+#include "common_audio/window_generator.h"
+
+#include <cmath>
+#include <complex>
+
+#include "rtc_base/checks.h"
+
+using std::complex;
+
+namespace {
+
+// Modified Bessel function of order 0 for complex inputs.
+complex<float> I0(complex<float> x) {
+  complex<float> y = x / 3.75f;
+  y *= y;
+  return 1.0f + y * (3.5156229f +
+                     y * (3.0899424f +
+                          y * (1.2067492f +
+                               y * (0.2659732f +
+                                    y * (0.360768e-1f + y * 0.45813e-2f)))));
+}
+
+}  // namespace
+
+namespace webrtc {
+
+void WindowGenerator::Hanning(int length, float* window) {
+  RTC_CHECK_GT(length, 1);
+  RTC_CHECK(window != nullptr);
+  for (int i = 0; i < length; ++i) {
+    window[i] =
+        0.5f * (1 - cosf(2 * static_cast<float>(M_PI) * i / (length - 1)));
+  }
+}
+
+void WindowGenerator::KaiserBesselDerived(float alpha,
+                                          size_t length,
+                                          float* window) {
+  RTC_CHECK_GT(length, 1U);
+  RTC_CHECK(window != nullptr);
+
+  const size_t half = (length + 1) / 2;
+  float sum = 0.0f;
+
+  for (size_t i = 0; i <= half; ++i) {
+    complex<float> r = (4.0f * i) / length - 1.0f;
+    sum += I0(static_cast<float>(M_PI) * alpha * sqrt(1.0f - r * r)).real();
+    window[i] = sum;
+  }
+  for (size_t i = length - 1; i >= half; --i) {
+    window[length - i - 1] = sqrtf(window[length - i - 1] / sum);
+    window[i] = window[length - i - 1];
+  }
+  if (length % 2 == 1) {
+    window[half - 1] = sqrtf(window[half - 1] / sum);
+  }
+}
+
+}  // namespace webrtc
diff --git a/third_party/libwebrtc/common_audio/window_generator.h b/third_party/libwebrtc/common_audio/window_generator.h
new file mode 100644
index 0000000000..c0a89c4f93
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/window_generator.h
@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_WINDOW_GENERATOR_H_
+#define COMMON_AUDIO_WINDOW_GENERATOR_H_
+
+#include <stddef.h>
+
+namespace webrtc {
+
+// Helper class with generators for various signal transform windows.
+class WindowGenerator {
+ public:
+  WindowGenerator() = delete;
+  WindowGenerator(const WindowGenerator&) = delete;
+  WindowGenerator& operator=(const WindowGenerator&) = delete;
+
+  static void Hanning(int length, float* window);
+  static void KaiserBesselDerived(float alpha, size_t length, float* window);
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_AUDIO_WINDOW_GENERATOR_H_
diff --git a/third_party/libwebrtc/common_audio/window_generator_unittest.cc b/third_party/libwebrtc/common_audio/window_generator_unittest.cc
new file mode 100644
index 0000000000..cf339327c6
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/window_generator_unittest.cc
@@ -0,0 +1,91 @@
+/*
+ *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "common_audio/window_generator.h"
+
+#include <cstring>
+
+#include "test/gtest.h"
+
+namespace webrtc {
+
+TEST(WindowGeneratorTest, KaiserBesselDerived) {
+  float window[7];
+
+  memset(window, 0, sizeof(window));
+
+  WindowGenerator::KaiserBesselDerived(0.397856f, 2, window);
+  ASSERT_NEAR(window[0], 0.707106f, 1e-6f);
+  ASSERT_NEAR(window[1], 0.707106f, 1e-6f);
+  ASSERT_NEAR(window[2], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[3], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[4], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[5], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[6], 0.0f, 1e-6f);
+
+  WindowGenerator::KaiserBesselDerived(0.397856f, 3, window);
+  ASSERT_NEAR(window[0], 0.598066f, 1e-6f);
+  ASSERT_NEAR(window[1], 0.922358f, 1e-6f);
+  ASSERT_NEAR(window[2], 0.598066f, 1e-6f);
+  ASSERT_NEAR(window[3], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[4], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[5], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[6], 0.0f, 1e-6f);
+
+  WindowGenerator::KaiserBesselDerived(0.397856f, 6, window);
+  ASSERT_NEAR(window[0], 0.458495038865344f, 1e-6f);
+  ASSERT_NEAR(window[1], 0.707106781186548f, 1e-6f);
+  ASSERT_NEAR(window[2], 0.888696967101760f, 1e-6f);
+  ASSERT_NEAR(window[3], 0.888696967101760f, 1e-6f);
+  ASSERT_NEAR(window[4], 0.707106781186548f, 1e-6f);
+  ASSERT_NEAR(window[5], 0.458495038865344f, 1e-6f);
+  ASSERT_NEAR(window[6], 0.0f, 1e-6f);
+}
+
+TEST(WindowGeneratorTest, Hanning) {
+  float window[7];
+
+  memset(window, 0, sizeof(window));
+
+  window[0] = -1.0f;
+  window[1] = -1.0f;
+  WindowGenerator::Hanning(2, window);
+  ASSERT_NEAR(window[0], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[1], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[2], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[3], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[4], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[5], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[6], 0.0f, 1e-6f);
+
+  window[0] = -1.0f;
+  window[2] = -1.0f;
+  WindowGenerator::Hanning(3, window);
+  ASSERT_NEAR(window[0], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[1], 1.0f, 1e-6f);
+  ASSERT_NEAR(window[2], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[3], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[4], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[5], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[6], 0.0f, 1e-6f);
+
+  window[0] = -1.0f;
+  window[5] = -1.0f;
+  WindowGenerator::Hanning(6, window);
+  ASSERT_NEAR(window[0], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[1], 0.345491f, 1e-6f);
+  ASSERT_NEAR(window[2], 0.904508f, 1e-6f);
+  ASSERT_NEAR(window[3], 0.904508f, 1e-6f);
+  ASSERT_NEAR(window[4], 0.345491f, 1e-6f);
+  ASSERT_NEAR(window[5], 0.0f, 1e-6f);
+  ASSERT_NEAR(window[6], 0.0f, 1e-6f);
+}
+
+}  // namespace webrtc