NetEq: Implement Expand::Muted

webrtc/modules/audio_coding/neteq/expand.h

 /*
  *  Copyright (c) 2012 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 44 matching lines @@
   // Prepare the object to do extra expansion during merge operation following
   // a period of expands.
   virtual void SetParametersForMergeAfterExpand();
 
   // Returns the mute factor for |channel|.
   int16_t MuteFactor(size_t channel) {
     assert(channel < num_channels_);
     return channel_parameters_[channel].mute_factor;
   }
 
+  // Returns true if expansion has been faded down to zero amplitude (for all
+  // channels); false otherwise.
+  bool Muted() const;
+
   // Accessors and mutators.
   virtual size_t overlap_length() const;
   size_t max_lag() const { return max_lag_; }
 
  protected:
   static const int kMaxConsecutiveExpands = 200;
   void GenerateRandomVector(int16_t seed_increment,
                             size_t length,
                             int16_t* random_vector);
 
@@ skipping 73 matching lines @@
   virtual Expand* Create(BackgroundNoise* background_noise,
                          SyncBuffer* sync_buffer,
                          RandomVector* random_vector,
                          StatisticsCalculator* statistics,
                          int fs,
                          size_t num_channels) const;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_EXPAND_H_