content/renderer/media/rtc_video_capturer.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_MEDIA_RTC_VIDEO_CAPTURER_H_
   6 #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_CAPTURER_H_
   7
   8 #include <vector>
   9
  10 #include "base/compiler_specific.h"
  11 #include "content/renderer/media/rtc_video_capture_delegate.h"
  12 #include "third_party/libjingle/source/talk/media/base/videocapturer.h"
  13
  14 namespace content {
  15
  16 // RtcVideoCapturer implements a simple cricket::VideoCapturer that is used for
  17 // VideoCapturing in libJingle and especially in PeerConnections.
  18 // The class is created and destroyed on the main render thread.
  19 // PeerConnection access cricket::VideoCapturer from a libJingle worker thread.
  20 // The video frames are delivered in OnFrameCaptured on a thread owned by
  21 // Chrome's video capture implementation.
  22 class RtcVideoCapturer
  23     : public cricket::VideoCapturer {
  24  public:
  25   RtcVideoCapturer(const media::VideoCaptureSessionId id,
  26                    bool is_screencast);
  27   virtual ~RtcVideoCapturer();
  28
  29   // cricket::VideoCapturer implementation.
  30   // These methods are accessed from a libJingle worker thread.
  31   virtual cricket::CaptureState Start(
  32       const cricket::VideoFormat& capture_format) OVERRIDE;
  33   virtual void Stop() OVERRIDE;
  34   virtual bool IsRunning() OVERRIDE;
  35   virtual bool GetPreferredFourccs(std::vector<uint32>* fourccs) OVERRIDE;
  36   virtual bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
  37                                     cricket::VideoFormat* best_format) OVERRIDE;
  38   virtual bool IsScreencast() const OVERRIDE;
  39
  40  private:
  41   // Frame captured callback method.
  42   virtual void OnFrameCaptured(const scoped_refptr<media::VideoFrame>& frame);
  43
  44   // State change callback, must be called on same thread as Start is called.
  45   void OnStateChange(RtcVideoCaptureDelegate::CaptureState state);
  46
  47   const bool is_screencast_;
  48   scoped_refptr<RtcVideoCaptureDelegate> delegate_;
  49   VideoCaptureState state_;
  50   base::TimeDelta first_frame_timestamp_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(RtcVideoCapturer);
  53 };
  54
  55 }  // namespace content
  56
  57 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_CAPTURER_H_