Implement disabling and enabling media tracks

media/base/renderer.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_BASE_RENDERER_H_
 #define MEDIA_BASE_RENDERER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "media/base/buffering_state.h"
 #include "media/base/cdm_context.h"
 #include "media/base/media_export.h"
 #include "media/base/pipeline_status.h"
 
 namespace media {
 
+class DemuxerStream;
 class DemuxerStreamProvider;
 class RendererClient;
 class VideoFrame;
 
 class MEDIA_EXPORT Renderer {
  public:
   Renderer();
 
   // Stops rendering and fires any pending callbacks.
   virtual ~Renderer();
@@ skipping 13 matching lines @@
                       const CdmAttachedCB& cdm_attached_cb) = 0;
 
   // The following functions must be called after Initialize().
 
   // Discards any buffered data, executing |flush_cb| when completed.
   virtual void Flush(const base::Closure& flush_cb) = 0;
 
   // Starts rendering from |time|.
   virtual void StartPlayingFrom(base::TimeDelta time) = 0;
 
+  virtual void RestartStreamPlayback(DemuxerStream* stream,
+                                     base::TimeDelta time) = 0;
+
   // Updates the current playback rate. The default playback rate should be 1.
   virtual void SetPlaybackRate(double playback_rate) = 0;
 
   // Sets the output volume. The default volume should be 1.
   virtual void SetVolume(float volume) = 0;
 
   // Returns the current media time.
   virtual base::TimeDelta GetMediaTime() = 0;
 
   // Returns whether |this| renders audio.
   virtual bool HasAudio() = 0;
 
   // Returns whether |this| renders video.
   virtual bool HasVideo() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Renderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_RENDERER_H_