Added further tuning of AEC3

webrtc/modules/audio_processing/aec3/residual_echo_estimator.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.
  */
 
@@ skipping 11 matching lines @@
 constexpr size_t kSaturationLeakageBlocks = 10;
 constexpr size_t kEchoPathChangeConvergenceBlocks = 3 * 250;
 
 // Estimates the residual echo power when there is no detection correlation
 // between the render and capture signals.
 void InfiniteErlPowerEstimate(
     size_t active_render_blocks,
     size_t blocks_since_last_saturation,
     const std::array<float, kFftLengthBy2Plus1>& S2_fallback,
     std::array<float, kFftLengthBy2Plus1>* R2) {
-  if (active_render_blocks > 5 * 250) {
+  if (active_render_blocks > 20 * 250) {
     // After an amount of active render samples for which an echo should have
     // been detected in the capture signal if the ERL was not infinite, set the
     // residual echo to 0.
     R2->fill(0.f);
   } else {
     // Before certainty has been reached about the presence of echo, use the
     // fallback echo power estimate as the residual echo estimate. Add a leakage
     // factor when there is saturation.
     std::copy(S2_fallback.begin(), S2_fallback.end(), R2->begin());
     if (blocks_since_last_saturation < kSaturationLeakageBlocks) {
@@ skipping 180 matching lines @@
 
 void ResidualEchoEstimator::HandleEchoPathChange(
     const EchoPathVariability& echo_path_variability) {
   if (echo_path_variability.AudioPathChanged()) {
     blocks_since_last_saturation_ = 0;
     echo_path_gain_.fill(100.f);
   }
 }
 
 }  // namespace webrtc