media: Introduce DemuxerStreamProvider interface.

media/filters/renderer_impl.h

Index: media/filters/renderer_impl.h
diff --git a/media/filters/renderer_impl.h b/media/filters/renderer_impl.h
index aa7918a2cb251208cd57035b77bdc98e9d76bbdc..02c730190de2d0e89c21112e902aef1aea95cfaa 100644
--- a/media/filters/renderer_impl.h
+++ b/media/filters/renderer_impl.h
@@ -24,20 +24,23 @@ class SingleThreadTaskRunner;
 namespace media {
 
 class AudioRenderer;
-class Demuxer;
+class DemuxerStreamProvider;
 class TimeDeltaInterpolator;
 class TimeSource;
 class VideoRenderer;
 
 class MEDIA_EXPORT RendererImpl : public Renderer {
  public:
-  // Renders audio/video streams in |demuxer| using |audio_renderer| and
-  // |video_renderer| provided. All methods except for GetMediaTime() run on the
-  // |task_runner|. GetMediaTime() runs on the render main thread because it's
-  // part of JS sync API. |get_duration_cb| is used to get the duration of the
-  // stream.
+  // Renders audio/video streams in |demuxer_stream_provider| using
+  // |audio_renderer| and |video_renderer| provided.
+  // Notes:
+  // - |demuxer_stream_provider| and the streams it provides are guaranteed to
+  //   be valid during the lifetime of this object.
+  // - All methods except for GetMediaTime() run on the |task_runner|.
+  //   GetMediaTime() runs on the render main thread because it's part of JS
+  //   sync API. |get_duration_cb| is used to get the duration of the stream.
   RendererImpl(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-               Demuxer* demuxer,
+               DemuxerStreamProvider* demuxer_stream_provider,
                scoped_ptr<AudioRenderer> audio_renderer,
                scoped_ptr<VideoRenderer> video_renderer);
 
@@ -128,7 +131,7 @@ class MEDIA_EXPORT RendererImpl : public Renderer {
   // Task runner used to execute pipeline tasks.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
-  Demuxer* demuxer_;
+  DemuxerStreamProvider* demuxer_stream_provider_;
 
   // Permanent callback to get the media duration.
   TimeDeltaCB get_duration_cb_;