Allow muting/unmuting audio through media track API

media/renderers/renderer_impl.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 MEDIA_RENDERERS_RENDERER_IMPL_H_
 #define MEDIA_RENDERERS_RENDERER_IMPL_H_
 
 #include <vector>
 
 #include "base/cancelable_callback.h"
@@ skipping 45 matching lines @@
                   const base::Closure& waiting_for_decryption_key_cb) final;
   void SetCdm(CdmContext* cdm_context,
               const CdmAttachedCB& cdm_attached_cb) final;
   void Flush(const base::Closure& flush_cb) final;
   void StartPlayingFrom(base::TimeDelta time) final;
   void SetPlaybackRate(double playback_rate) final;
   void SetVolume(float volume) final;
   base::TimeDelta GetMediaTime() final;
   bool HasAudio() final;
   bool HasVideo() final;
+  void OnEnabledAudioStreamsChanged(
+      const std::vector<const DemuxerStream*>& enabledAudioStreams) final;
+  void OnSelectedVideoStreamChanged(
+      const DemuxerStream* selectedVideoStream) final;
 
   // Helper functions for testing purposes. Must be called before Initialize().
   void DisableUnderflowForTesting();
   void EnableClocklessVideoPlaybackForTesting();
   void set_time_source_for_testing(TimeSource* time_source) {
     time_source_ = time_source;
   }
   void set_video_underflow_threshold_for_testing(base::TimeDelta threshold) {
     video_underflow_threshold_ = threshold;
   }
@@ skipping 68 matching lines @@
   BufferingStateCB buffering_state_cb_;
   base::Closure waiting_for_decryption_key_cb_;
 
   // Temporary callback used for Initialize() and Flush().
   PipelineStatusCB init_cb_;
   base::Closure flush_cb_;
 
   scoped_ptr<AudioRenderer> audio_renderer_;
   scoped_ptr<VideoRenderer> video_renderer_;
 
+  bool audio_stream_currently_disabled_ = false;
+  float audio_volume_ = 1.0f;
+
   // Renderer-provided time source used to control playback.
   TimeSource* time_source_;
   scoped_ptr<WallClockTimeSource> wall_clock_time_source_;
   bool time_ticking_;
   double playback_rate_;
 
   // The time to start playback from after starting/seeking has completed.
   base::TimeDelta start_time_;
 
   BufferingState audio_buffering_state_;
@@ skipping 18 matching lines @@
 
   base::WeakPtr<RendererImpl> weak_this_;
   base::WeakPtrFactory<RendererImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_RENDERERS_RENDERER_IMPL_H_