1 files changed, 81 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/aec3/render_buffer.cc b/third_party/libwebrtc/modules/audio_processing/aec3/render_buffer.cc
new file mode 100644
index 0000000000..aa511e2b6b
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_processing/aec3/render_buffer.cc
@@ -0,0 +1,81 @@
+/*
+ *  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 "modules/audio_processing/aec3/render_buffer.h"
+
+#include <algorithm>
+#include <functional>
+
+#include "modules/audio_processing/aec3/aec3_common.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+RenderBuffer::RenderBuffer(BlockBuffer* block_buffer,
+                           SpectrumBuffer* spectrum_buffer,
+                           FftBuffer* fft_buffer)
+    : block_buffer_(block_buffer),
+      spectrum_buffer_(spectrum_buffer),
+      fft_buffer_(fft_buffer) {
+  RTC_DCHECK(block_buffer_);
+  RTC_DCHECK(spectrum_buffer_);
+  RTC_DCHECK(fft_buffer_);
+  RTC_DCHECK_EQ(block_buffer_->buffer.size(), fft_buffer_->buffer.size());
+  RTC_DCHECK_EQ(spectrum_buffer_->buffer.size(), fft_buffer_->buffer.size());
+  RTC_DCHECK_EQ(spectrum_buffer_->read, fft_buffer_->read);
+  RTC_DCHECK_EQ(spectrum_buffer_->write, fft_buffer_->write);
+}
+
+RenderBuffer::~RenderBuffer() = default;
+
+void RenderBuffer::SpectralSum(
+    size_t num_spectra,
+    std::array<float, kFftLengthBy2Plus1>* X2) const {
+  X2->fill(0.f);
+  int position = spectrum_buffer_->read;
+  for (size_t j = 0; j < num_spectra; ++j) {
+    for (const auto& channel_spectrum : spectrum_buffer_->buffer[position]) {
+      for (size_t k = 0; k < X2->size(); ++k) {
+        (*X2)[k] += channel_spectrum[k];
+      }
+    }
+    position = spectrum_buffer_->IncIndex(position);
+  }
+}
+
+void RenderBuffer::SpectralSums(
+    size_t num_spectra_shorter,
+    size_t num_spectra_longer,
+    std::array<float, kFftLengthBy2Plus1>* X2_shorter,
+    std::array<float, kFftLengthBy2Plus1>* X2_longer) const {
+  RTC_DCHECK_LE(num_spectra_shorter, num_spectra_longer);
+  X2_shorter->fill(0.f);
+  int position = spectrum_buffer_->read;
+  size_t j = 0;
+  for (; j < num_spectra_shorter; ++j) {
+    for (const auto& channel_spectrum : spectrum_buffer_->buffer[position]) {
+      for (size_t k = 0; k < X2_shorter->size(); ++k) {
+        (*X2_shorter)[k] += channel_spectrum[k];
+      }
+    }
+    position = spectrum_buffer_->IncIndex(position);
+  }
+  std::copy(X2_shorter->begin(), X2_shorter->end(), X2_longer->begin());
+  for (; j < num_spectra_longer; ++j) {
+    for (const auto& channel_spectrum : spectrum_buffer_->buffer[position]) {
+      for (size_t k = 0; k < X2_longer->size(); ++k) {
+        (*X2_longer)[k] += channel_spectrum[k];
+      }
+    }
+    position = spectrum_buffer_->IncIndex(position);
+  }
+}
+
+}  // namespace webrtc