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diff --git a/third_party/libwebrtc/modules/audio_processing/ns/BUILD.gn b/third_party/libwebrtc/modules/audio_processing/ns/BUILD.gn
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+++ b/third_party/libwebrtc/modules/audio_processing/ns/BUILD.gn
@@ -0,0 +1,104 @@
+# Copyright (c) 2019 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_static_library("ns") {
+ visibility = [ "*" ]
+ configs += [ "..:apm_debug_dump" ]
+ sources = [
+ "fast_math.cc",
+ "fast_math.h",
+ "histograms.cc",
+ "histograms.h",
+ "noise_estimator.cc",
+ "noise_estimator.h",
+ "noise_suppressor.cc",
+ "noise_suppressor.h",
+ "ns_common.h",
+ "ns_config.h",
+ "ns_fft.cc",
+ "ns_fft.h",
+ "prior_signal_model.cc",
+ "prior_signal_model.h",
+ "prior_signal_model_estimator.cc",
+ "prior_signal_model_estimator.h",
+ "quantile_noise_estimator.cc",
+ "quantile_noise_estimator.h",
+ "signal_model.cc",
+ "signal_model.h",
+ "signal_model_estimator.cc",
+ "signal_model_estimator.h",
+ "speech_probability_estimator.cc",
+ "speech_probability_estimator.h",
+ "suppression_params.cc",
+ "suppression_params.h",
+ "wiener_filter.cc",
+ "wiener_filter.h",
+ ]
+
+ defines = []
+ if (rtc_build_with_neon && target_cpu != "arm64") {
+ suppressed_configs += [ "//build/config/compiler:compiler_arm_fpu" ]
+ cflags = [ "-mfpu=neon" ]
+ }
+
+ deps = [
+ "..:apm_logging",
+ "..:audio_buffer",
+ "..:high_pass_filter",
+ "../../../api:array_view",
+ "../../../common_audio:common_audio_c",
+ "../../../common_audio/third_party/ooura:fft_size_128",
+ "../../../common_audio/third_party/ooura:fft_size_256",
+ "../../../rtc_base:checks",
+ "../../../rtc_base:safe_minmax",
+ "../../../rtc_base/system:arch",
+ "../../../system_wrappers",
+ "../../../system_wrappers:field_trial",
+ "../../../system_wrappers:metrics",
+ "../utility:cascaded_biquad_filter",
+ ]
+ absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+}
+
+if (rtc_include_tests) {
+ rtc_source_set("ns_unittests") {
+ testonly = true
+
+ configs += [ "..:apm_debug_dump" ]
+ sources = [ "noise_suppressor_unittest.cc" ]
+
+ deps = [
+ ":ns",
+ "..:apm_logging",
+ "..:audio_buffer",
+ "..:audio_processing",
+ "..:high_pass_filter",
+ "../../../api:array_view",
+ "../../../rtc_base:checks",
+ "../../../rtc_base:safe_minmax",
+ "../../../rtc_base:stringutils",
+ "../../../rtc_base/system:arch",
+ "../../../system_wrappers",
+ "../../../test:test_support",
+ "../utility:cascaded_biquad_filter",
+ ]
+ absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
+
+ defines = []
+
+ if (rtc_enable_protobuf) {
+ sources += []
+ }
+
+ if (!build_with_chromium) {
+ deps += [ "..:audio_processing_unittests" ]
+ }
+ }
+}