Added mute logic to VideoTrackRenderers.

talk/app/webrtc/videotrackrenderers.h

 /*
  * libjingle
  * Copyright 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 29 matching lines @@
 // Class used for rendering cricket::VideoFrames to multiple renderers of type
 // VideoRendererInterface.
 // Each VideoTrack owns a VideoTrackRenderers instance.
 // The class is thread safe. Rendering to the added VideoRendererInterfaces is
 // done on the same thread as the cricket::VideoRenderer.
 class VideoTrackRenderers : public cricket::VideoRenderer {
  public:
   VideoTrackRenderers();
   ~VideoTrackRenderers();
 
-  // Implements cricket::VideoRenderer
+  // Implements cricket::VideoRenderer. If the track is disabled,
+  // incoming frames are replaced by black frames.
   virtual bool RenderFrame(const cricket::VideoFrame* frame);
 
   void AddRenderer(VideoRendererInterface* renderer);
   void RemoveRenderer(VideoRendererInterface* renderer);
   void SetEnabled(bool enable);
 
  private:
+  // Pass the frame on to to each registered renderer. Requires
+  // critical_section_ already locked.
+  void RenderFrameToRenderers(const cricket::VideoFrame* frame);
+
   bool enabled_;
   std::set<VideoRendererInterface*> renderers_;
 
   rtc::CriticalSection critical_section_;  // Protects the above variables
 };
 
 }  // namespace webrtc
 
 #endif  // TALK_APP_WEBRTC_VIDEOTRACKRENDERERS_H_