Finalization of the first version of EchoCanceller 3

webrtc/modules/audio_processing/aec3/matched_filter_lag_aggregator.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/matched_filter_lag_aggregator.h"
@@ skipping 41 matching lines @@
   // Require the same lag to be detected 10 times in a row before considering
   // it reliable.
   if (best_lag_estimate_index >= 0) {
     candidate_counter_ =
         (candidate_ == lag_estimates[best_lag_estimate_index].lag)
             ? candidate_counter_ + 1
             : 0;
     candidate_ = lag_estimates[best_lag_estimate_index].lag;
   }
 
-  return candidate_counter_ >= 10 ? rtc::Optional<size_t>(candidate_)
+  return candidate_counter_ >= 15 ? rtc::Optional<size_t>(candidate_)
                                   : rtc::Optional<size_t>();
 }
 
 }  // namespace webrtc