Detect AudioInputStream muting and propagate to MediaStreamAudioSource.

content/renderer/media/media_stream_audio_source.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 114 matching lines @@
   // Called by subclasses to deliver audio data to the currently-connected
   // tracks. This method is thread-safe.
   void DeliverDataToTracks(const media::AudioBus& audio_bus,
                            base::TimeTicks reference_time);
 
   // Called by subclasses when capture error occurs.
   // Note: This can be called on any thread, and will post a task to the main
   // thread to stop the source soon.
   void StopSourceOnError(const std::string& why);
 
+  // Sets muted state and notifies it to all registered tracks.
+  void SetMutedState(bool state);
+
  private:
   // MediaStreamSource override.
   void DoStopSource() final;
 
   // Removes |track| from the list of instances that get a copy of the source
   // audio data. The "stop callback" that was provided to the track calls
   // this.
   void StopAudioDeliveryTo(MediaStreamAudioTrack* track);
 
   // True if the source of audio is a local device. False if the source is
@@ skipping 14 matching lines @@
   // Provides weak pointers so that MediaStreamAudioTracks won't call
   // StopAudioDeliveryTo() if this instance dies first.
   base::WeakPtrFactory<MediaStreamAudioSource> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_SOURCE_H_