[PPAPI] Implement media stream video track API

ppapi/proxy/video_frame_resource.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 PPAPI_PROXY_VIDEO_FRAME_RESOURCE_H_
+#define PPAPI_PROXY_VIDEO_FRAME_RESOURCE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/media_stream_frame.h"
+#include "ppapi/shared_impl/resource.h"
+#include "ppapi/thunk/ppb_video_frame_api.h"
+
+namespace ppapi {
+namespace proxy {
+
+class MediaStreamVideoTrackResource;
+
+class PPAPI_PROXY_EXPORT VideoFrameResource : public Resource,
+                                              public thunk::PPB_VideoFrame_API {
+ public:
+  virtual ~VideoFrameResource();
+
+  // PluginResource overrides:
+  virtual thunk::PPB_VideoFrame_API* AsPPB_VideoFrame_API() OVERRIDE;
+
+  // PPB_VideoFrame_API overrides:
+  virtual PP_TimeDelta GetTimestamp() OVERRIDE;
+  virtual void SetTimestamp(PP_TimeDelta timestamp) OVERRIDE;
+  virtual PP_VideoFrame_Format GetFormat() OVERRIDE;
+  virtual PP_Bool GetSize(PP_Size* size) OVERRIDE;
+  virtual void* GetDataBuffer() OVERRIDE;
+  virtual uint32_t GetDataBufferSize() OVERRIDE;
+
+ private:
+  friend class MediaStreamVideoTrackResource;
+
+  VideoFrameResource(PP_Instance instance,
+                     int32_t index,
+                     MediaStreamFrame::Video* frame);
+
+  int32_t index() const { return index_; }
+
+  MediaStreamFrame::Video* video_frame() const { return frame_; }
+
+  void invalidate() {
+    frame_ = NULL;
+    index_ = -1;
+  }
+
+  // Frame index
+  int32_t index_;
+
+  MediaStreamFrame::Video* frame_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoFrameResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_VIDEO_FRAME_RESOURCE_H_