[WIP][PPAPI] Implement MediaStreamVideoTrackResource.

content/renderer/pepper/pepper_media_stream_video_track_host.h

+// Copyright (c) 2013 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/synchronization/lock.h"
+#include "content/common/content_export.h"
+#include "content/public/renderer/media_stream_video_sink.h"
+#include "content/renderer/pepper/pepper_io_stream_host.h"
+#include "media/base/video_frame.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/host/resource_host.h"
+#include "ppapi/shared_impl/io_stream_shared.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+#include "ui/gfx/size.h"
+
+namespace content {
+
+class PepperMediaStreamVideoTrackHost :
+  public PepperIOStreamHost,
+  public MediaStreamVideoSink {
+ public:
+  PepperMediaStreamVideoTrackHost(RendererPpapiHost* host,
+                                  PP_Instance instance,
+                                  PP_Resource resource,
+                                  const blink::WebMediaStreamTrack& track);
+
+  virtual ~PepperMediaStreamVideoTrackHost();
+
+  virtual int32_t OnResourceMessageReceived(
+      const IPC::Message& msg,
+      ppapi::host::HostMessageContext* context) OVERRIDE;
+
+  virtual void OnVideoFrame(
+      const scoped_refptr<media::VideoFrame>& frame) OVERRIDE;
+
+ protected:
+  virtual void DidConnectPendingHostToResource() OVERRIDE;
+
+ private:
+  int32_t OnHostMsgStartCapture(ppapi::host::HostMessageContext* context);
+
+  void AllocFrameBuffers();
+
+  blink::WebMediaStreamTrack track_;
+
+  // frame buffer size in frames.
+  uint32_t frame_buffer_size_;
+
+  // frame size.
+  gfx::Size frame_size_;
+
+  // frame format.
+  media::VideoFrame::Format frame_format_;
+
+  // frame data size in bytes.
+  uint32_t frame_data_size_;
+
+  uint32_t slot_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamVideoTrackHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_