Implement disabling and enabling media tracks

media/filters/chunk_demuxer.h

 // Copyright (c) 2012 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_CHUNK_DEMUXER_H_
 #define MEDIA_FILTERS_CHUNK_DEMUXER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 87 matching lines @@
   void UnmarkEndOfStream();
 
   // DemuxerStream methods.
   void Read(const ReadCB& read_cb) override;
   Type type() const override;
   Liveness liveness() const override;
   AudioDecoderConfig audio_decoder_config() override;
   VideoDecoderConfig video_decoder_config() override;
   bool SupportsConfigChanges() override;
   VideoRotation video_rotation() override;
+  bool enabled() const override;
+  void set_enabled(bool enabled, base::TimeDelta timestamp) override;
 
   // Returns the text track configuration.  It is an error to call this method
   // if type() != TEXT.
   TextTrackConfig text_track_config();
 
   // Sets the memory limit, in bytes, on the SourceBufferStream.
   void SetStreamMemoryLimit(size_t memory_limit);
 
   bool supports_partial_append_window_trimming() const {
     return partial_append_window_trimming_enabled_;
@@ skipping 19 matching lines @@
 
   Liveness liveness_;
 
   std::unique_ptr<SourceBufferStream> stream_;
 
   mutable base::Lock lock_;
   State state_;
   ReadCB read_cb_;
   bool splice_frames_enabled_;
   bool partial_append_window_trimming_enabled_;
+  bool is_enabled_ = true;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChunkDemuxerStream);
 };
 
 // Demuxer implementation that allows chunks of media data to be passed
 // from JavaScript to the media stack.
 class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
  public:
   enum Status {
     kOk,              // ID added w/o error.
@@ skipping 268 matching lines @@
   int detected_audio_track_count_;
   int detected_video_track_count_;
   int detected_text_track_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ChunkDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_CHUNK_DEMUXER_H_