[PPAPI] Implement media stream video track API

ppapi/proxy/media_stream_video_track_resource.h

+// Copyright (c) 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_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_
+#define PPAPI_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_
+
+#include <map>
+
+#include "base/memory/ref_counted.h"
+#include "ppapi/proxy/media_stream_track_resource_base.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/thunk/ppb_media_stream_video_track_api.h"
+
+namespace ppapi {
+namespace proxy {
+
+class VideoFrameResource;
+
+class PPAPI_PROXY_EXPORT MediaStreamVideoTrackResource
+    : public MediaStreamTrackResourceBase,
+      public thunk::PPB_MediaStreamVideoTrack_API {
+ public:
+  MediaStreamVideoTrackResource(Connection connection,
+                                PP_Instance instance,
+                                int pending_renderer_id,
+                                const std::string& id);
+
+  virtual ~MediaStreamVideoTrackResource();
+
+  // Resource overrides:
+  virtual thunk::PPB_MediaStreamVideoTrack_API*
+  AsPPB_MediaStreamVideoTrack_API() OVERRIDE;
+
+  // PPB_MediaStreamVideoTrack_API overrides:
+  virtual PP_Var GetId() OVERRIDE;
+  virtual PP_Bool HasEnded() OVERRIDE;
+  virtual int32_t Configure(uint32_t max_buffered_frames) OVERRIDE;
+  virtual int32_t GetFrame(
+      PP_Resource* frame,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t RecycleFrame(PP_Resource frame) OVERRIDE;
+  virtual void Close() OVERRIDE;
+
+  // MediaStreamFrameBuffer::Delegate overrides:
+  virtual void OnNewFrameEnqueued() OVERRIDE;
+
+ private:
+  PP_Resource GetVideoFrame();
+
+  void ReleaseFrames();
+
+  // Allocated frame resources by |GetFrame()|.
+  typedef std::map<PP_Resource, scoped_refptr<VideoFrameResource> > FrameMap;
+  FrameMap frames_;
+
+  PP_Resource* get_frame_output_;
+
+  scoped_refptr<TrackedCallback> get_frame_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrackResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_