create WebMediaPlayer based on URL

content/renderer/media/video_capture_relay.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_VIDEO_CAPTURE_RELAY_H_
+#define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_RELAY_H_
+
+#include "base/threading/thread.h"
+#include "base/time.h"
+#include "content/common/content_export.h"
+#include "media/base/video_frame.h"
+#include "media/video/capture/video_capture.h"
+#include "webkit/media/video_frame_provider.h"
+
+namespace base {
+class MessageLoopProxy;
+}
+class VideoCaptureImplManager;
+
+// Takes raw frames from video capture engine and passes them to media
+// player as a video frame provider.
+class CONTENT_EXPORT VideoCaptureRelay
+    : public webkit_media::VideoFrameProvider,
+      public media::VideoCapture::EventHandler {
+ public:
+  VideoCaptureRelay(
+      media::VideoCaptureSessionId video_stream_id,
+      VideoCaptureImplManager* vc_manager,
+      const media::VideoCaptureCapability& capability,
+      const base::Closure& paint_cb);
+  virtual ~VideoCaptureRelay();
+
+  // webkit_media::VideoFrameProvider implementation.
+  virtual void Start() OVERRIDE;
+  virtual void Stop(const base::Closure& callback) OVERRIDE;
+  virtual void GetCurrentFrame(
+      scoped_refptr<media::VideoFrame>* frame_out) OVERRIDE;
+  virtual void PutCurrentFrame(scoped_refptr<media::VideoFrame> frame) OVERRIDE;
+
+  // VideoCapture::EventHandler implementation.
+  virtual void OnStarted(media::VideoCapture* capture) OVERRIDE;
+  virtual void OnStopped(media::VideoCapture* capture) OVERRIDE;
+  virtual void OnPaused(media::VideoCapture* capture) OVERRIDE;
+  virtual void OnError(media::VideoCapture* capture, int error_code) OVERRIDE;
+  virtual void OnRemoved(media::VideoCapture* capture) OVERRIDE;
+  virtual void OnBufferReady(
+      media::VideoCapture* capture,
+      scoped_refptr<media::VideoCapture::VideoFrameBuffer> buf) OVERRIDE;
+  virtual void OnDeviceInfoReceived(
+      media::VideoCapture* capture,
+      const media::VideoCaptureParams& device_info) OVERRIDE;
+
+ private:
+  friend class VideoCaptureRelayTest;
+
+  void StartOnRelayThread();
+  void StopOnRelayThread(const base::Closure& callback);
+
+  void OnStoppedOnRelayThread(media::VideoCapture* capture);
+  void OnBufferReadyOnRelayThread(
+      media::VideoCapture* capture,
+      scoped_refptr<media::VideoCapture::VideoFrameBuffer> buf);
+  void OnDeviceInfoReceivedOnRelayThread(
+      media::VideoCapture* capture,
+      const media::VideoCaptureParams& device_info);
+
+  base::Thread thread_;
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
+  base::Lock lock_;
+  scoped_refptr<VideoCaptureImplManager> vc_manager_;
+  media::VideoCaptureCapability capability_;
+  bool is_active_;
+  base::Closure pending_stop_cb_;
+  bool pending_paint_;
+  base::Closure paint_cb_;
+  scoped_refptr<media::VideoFrame> current_frame_;
+
+  media::VideoCaptureSessionId video_stream_id_;
+  media::VideoCapture* capture_engine_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoCaptureRelay);
+};
+
+#endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_RELAY_H_