Allow muting/unmuting audio through media track API

media/filters/media_source_state.h

 // Copyright (c) 2016 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_FILTERS_MEDIA_SOURCE_STATE_H_
 #define MEDIA_FILTERS_MEDIA_SOURCE_STATE_H_
 
 #include <list>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_export.h"
 #include "media/base/stream_parser.h"
 #include "media/base/stream_parser_buffer.h"
 
 namespace media {
 
 using base::TimeDelta;
 
 class ChunkDemuxerStream;
 class FrameProcessor;
+class MediaTrack;
 
 // Contains state belonging to a source id.
 class MEDIA_EXPORT MediaSourceState {
  public:
   // Callback signature used to create ChunkDemuxerStreams.
-  typedef base::Callback<ChunkDemuxerStream*(DemuxerStream::Type)>
+  typedef base::Callback<ChunkDemuxerStream*(const MediaTrack&)>
       CreateDemuxerStreamCB;
 
   typedef base::Callback<void(ChunkDemuxerStream*, const TextTrackConfig&)>
       NewTextTrackCB;
 
   MediaSourceState(scoped_ptr<StreamParser> stream_parser,
                    scoped_ptr<FrameProcessor> frame_processor,
                    const CreateDemuxerStreamCB& create_demuxer_stream_cb,
                    const scoped_refptr<MediaLog>& media_log);
 
@@ skipping 179 matching lines @@
   // TODO(wolenetz): Refactor this function while integrating April 29, 2014
   // changes to MSE spec. See http://crbug.com/371499.
   bool auto_update_timestamp_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaSourceState);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_MEDIA_SOURCE_STATE_H_