Robustification of the AEC3 echo removal in the first part of the call

webrtc/modules/audio_processing/aec3/residual_echo_estimator.h

 /*
  *  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 30 matching lines @@
 
   // Estimates the residual echo power based on the echo return loss enhancement
   // (ERLE) and the linear power estimate.
   void LinearEstimate(const std::array<float, kFftLengthBy2Plus1>& S2_linear,
                       const std::array<float, kFftLengthBy2Plus1>& erle,
                       size_t delay,
                       std::array<float, kFftLengthBy2Plus1>* R2);
 
   // Estimates the residual echo power based on the estimate of the echo path
   // gain.
-  void NonLinearEstimate(float echo_path_gain,
+  void NonLinearEstimate(bool headset_detected,
                          const std::array<float, kFftLengthBy2Plus1>& X2,
                          const std::array<float, kFftLengthBy2Plus1>& Y2,
                          std::array<float, kFftLengthBy2Plus1>* R2);
 
   // Adds the estimated unmodelled echo power to the residual echo power
   // estimate.
   void AddEchoReverb(const std::array<float, kFftLengthBy2Plus1>& S2,
                      bool saturated_echo,
                      size_t delay,
                      float reverb_decay_factor,
                      std::array<float, kFftLengthBy2Plus1>* R2);
 
   std::array<float, kFftLengthBy2Plus1> R2_old_;
   std::array<int, kFftLengthBy2Plus1> R2_hold_counter_;
   std::array<float, kFftLengthBy2Plus1> R2_reverb_;
   int S2_old_index_ = 0;
   std::array<std::array<float, kFftLengthBy2Plus1>, kAdaptiveFilterLength>
       S2_old_;
   std::array<float, kFftLengthBy2Plus1> X2_noise_floor_;
   std::array<int, kFftLengthBy2Plus1> X2_noise_floor_counter_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ResidualEchoEstimator);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RESIDUAL_ECHO_ESTIMATOR_H_