Cast: deliver video frames on the IO thread

content/renderer/pepper/pepper_media_stream_video_track_host.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 CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
 
 #include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
 #include "content/public/renderer/media_stream_video_sink.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
 #include "media/base/video_frame.h"
 #include "ppapi/c/ppb_video_frame.h"
 #include "ppapi/shared_impl/media_stream_video_track_shared.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "ui/gfx/size.h"
 
 namespace content {
@@ skipping 28 matching lines @@
   void InitBuffers();
 
   // PepperMediaStreamTrackHostBase overrides:
   virtual void OnClose() OVERRIDE;
   virtual int32_t OnHostMsgEnqueueBuffer(
       ppapi::host::HostMessageContext* context, int32_t index) OVERRIDE;
 
   // Sends frame with |index| to |track_|.
   int32_t SendFrameToTrack(int32_t index);
 
-  // MediaStreamVideoSink overrides:
-  virtual void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame)
-      OVERRIDE;
+  void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
+                    const media::VideoCaptureFormat& format);
 
   // MediaStreamVideoSource overrides:
   virtual void GetCurrentSupportedFormats(
       int max_requested_width,
       int max_requested_height,
       const VideoCaptureDeviceFormatsCB& callback) OVERRIDE;
 
   virtual void StartSourceImpl(
       const media::VideoCaptureParams& params,
       const VideoCaptureDeliverFrameCB& frame_callback) OVERRIDE;
@@ skipping 42 matching lines @@
   // TODO(ronghuawu): Remove |type_| and split PepperMediaStreamVideoTrackHost
   // into 2 classes for read and write.
   TrackType type_;
   bool output_started_;
 
   // Internal class used for delivering video frames on the IO-thread to
   // the MediaStreamVideoSource implementation.
   class FrameDeliverer;
   scoped_refptr<FrameDeliverer> frame_deliverer_;
 
+  base::WeakPtrFactory<PepperMediaStreamVideoTrackHost> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamVideoTrackHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_