create a separate WebMediaPlayer for URL derived from media stream

webkit/media/video_frame_provider.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 WEBKIT_MEDIA_VIDEO_FRAME_PROVIDER_H_
+#define WEBKIT_MEDIA_VIDEO_FRAME_PROVIDER_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+
+namespace media {
+class VideoFrame;
+}
+
+namespace webkit_media {
+
+// Define an interface to provide a sequence of video frames to clients.
+class VideoFrameProvider
+    : public base::RefCountedThreadSafe<VideoFrameProvider> {
+ public:
+  typedef base::Callback<void(const scoped_refptr<media::VideoFrame>&)>
+      RepaintCB;
+
+  // Start to provide video frames to the caller.
+  virtual void Start() = 0;
+  // Stop to provide video frames to the caller.

[scherkus (not reviewing), 2012/09/13 10:22:43]

nit: can you add blank lines before // comments?

it's very wall-of-text-y looking like this

[wjia(left Chromium), 2012/09/19 03:22:06]

Done.

+  virtual void Stop() = 0;
+  // Resume to provide video frames to the caller after being paused.
+  virtual void Play() = 0;
+  // Put the provider in pause state and the caller will not receive video
+  // frames, but the provider might still generate video frames which are
+  // thrown away.
+  virtual void Pause() = 0;
+
+ protected:
+  friend class base::RefCountedThreadSafe<VideoFrameProvider>;
+  VideoFrameProvider();
+  virtual ~VideoFrameProvider();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoFrameProvider);
+};
+
+}  // namespace webkit_media
+
+#endif  // WEBKIT_MEDIA_VIDEO_FRAME_PROVIDER_H_