Major AEC3 render pipeline changes

webrtc/modules/audio_processing/aec3/render_signal_analyzer.cc

 /*
  *  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 "webrtc/modules/audio_processing/aec3/render_signal_analyzer.h"
 
 #include <algorithm>
 
 #include "webrtc/base/checks.h"
 
 namespace webrtc {
 
 namespace {
 constexpr size_t kCounterThreshold = 5;
 
 }  // namespace
 
 RenderSignalAnalyzer::RenderSignalAnalyzer() {
   narrow_band_counters_.fill(0);
 }
 RenderSignalAnalyzer::~RenderSignalAnalyzer() = default;
 
 void RenderSignalAnalyzer::Update(
-    const FftBuffer& X_buffer,
+    const RenderBuffer& render_buffer,
     const rtc::Optional<size_t>& delay_partitions) {
   if (!delay_partitions) {
     narrow_band_counters_.fill(0);
     return;
   }
 
   const std::array<float, kFftLengthBy2Plus1>& X2 =
-      X_buffer.Spectrum(*delay_partitions);
+      render_buffer.Spectrum(*delay_partitions);
 
   // Detect narrow band signal regions.
   for (size_t k = 1; k < (X2.size() - 1); ++k) {
     narrow_band_counters_[k - 1] = X2[k] > 3 * std::max(X2[k - 1], X2[k + 1])
                                        ? narrow_band_counters_[k - 1] + 1
                                        : 0;
   }
 }
 
 void RenderSignalAnalyzer::MaskRegionsAroundNarrowBands(
     std::array<float, kFftLengthBy2Plus1>* v) const {
   RTC_DCHECK(v);
 
   // Set v to zero around narrow band signal regions.
   if (narrow_band_counters_[0] > kCounterThreshold) {
     (*v)[1] = (*v)[0] = 0.f;
   }
   for (size_t k = 2; k < kFftLengthBy2 - 1; ++k) {
     if (narrow_band_counters_[k - 1] > kCounterThreshold) {
       (*v)[k - 2] = (*v)[k - 1] = (*v)[k] = (*v)[k + 1] = (*v)[k + 2] = 0.f;
     }
   }
   if (narrow_band_counters_[kFftLengthBy2 - 2] > kCounterThreshold) {
     (*v)[kFftLengthBy2] = (*v)[kFftLengthBy2 - 1] = 0.f;
   }
 }
 
 }  // namespace webrtc