create a separate WebMediaPlayer for URL derived from media stream

content/renderer/media/rtc_video_render.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 CONTENT_RENDERER_MEDIA_LOCAL_VIDEO_RENDER_H_
+#define CONTENT_RENDERER_MEDIA_LOCAL_VIDEO_RENDER_H_
+
+#include "base/callback.h"
+#include "content/common/content_export.h"
+#include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
+#include "ui/gfx/size.h"
+#include "webkit/media/video_frame_provider.h"
+
+namespace base {
+class MessageLoopProxy;
+}
+
+// RTCVideoRender is a webkit_media::VideoFrameProvider designed for rendering
+// Video MediaStreamTracks,
+// http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreamtrack
+// RTCVideoRender implements webrtc::VideoRendererInterface in order to render
+// video frames provided from a webrtc::VideoTrackInteface.
+// RTCVideoRender register itself to the Video Track when the
+// VideoFrameProvider is started and deregisters itself when it is stopped.
+// Calls to webrtc::VideoTrackInterface must occur in the main thread.
+class CONTENT_EXPORT RTCVideoRender

[scherkus (not reviewing), 2012/09/07 11:44:03]

Shouldn't this be RTCVideoRenderer (extra "er" on end)?

[wjia(left Chromium), 2012/09/13 01:22:07]

Done.

+    : NON_EXPORTED_BASE(public webkit_media::VideoFrameProvider),
+      NON_EXPORTED_BASE(public webrtc::VideoRendererInterface) {
+ public:
+  RTCVideoRender(
+      webrtc::VideoTrackInterface* video_track,
+      const base::Closure& error_cb,
+      const webkit_media::RepaintCB& repaint_cb);
+
+  // webkit_media::VideoFrameProvider implementation. Called in the main thread.

[scherkus (not reviewing), 2012/09/07 11:44:03]

s/in/on/

[wjia(left Chromium), 2012/09/13 01:22:07]

Done.

+  virtual void Start() OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void Play() OVERRIDE;
+  virtual void Pause() OVERRIDE;
+
+  // webrtc::VideoRendererInterface implementation. May be called in

[scherkus (not reviewing), 2012/09/07 11:44:03]

s/in/on/

[wjia(left Chromium), 2012/09/13 01:22:07]

Done.

+  // a different thread.
+  virtual void SetSize(int width, int height) OVERRIDE;
+  virtual void RenderFrame(const cricket::VideoFrame* frame) OVERRIDE;
+
+ protected:
+  virtual ~RTCVideoRender();
+
+ private:
+  enum ProviderState {

[scherkus (not reviewing), 2012/09/07 11:44:03]

s/ProviderState/State/?

[wjia(left Chromium), 2012/09/13 01:22:07]

Done.

+    kStarted,
+    kPaused,
+    kStopped,
+  };
+
+  void DoRenderFrameOnMainThread(scoped_refptr<media::VideoFrame> video_frame);
+
+  base::Closure error_cb_;
+  webkit_media::RepaintCB repaint_cb_;
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
+  ProviderState state_;
+
+  // The video track the renderer is connected to.
+  scoped_refptr<webrtc::VideoTrackInterface> video_track_;
+
+  DISALLOW_COPY_AND_ASSIGN(RTCVideoRender);
+};
+
+#endif  // CONTENT_RENDERER_MEDIA_LOCAL_VIDEO_RENDER_H_