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      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 class VideoCaptureImplManager;
     16 
     17 // RtcVideoCapturer implements a simple cricket::VideoCapturer that is used for
     18 // VideoCapturing in libJingle and especially in PeerConnections.
     19 // The class is created and destroyed on the main render thread.
     20 // PeerConnection access cricket::VideoCapturer from a libJingle worker thread.
     21 // The video frames are delivered in OnFrameCaptured on a thread owned by
     22 // Chrome's video capture implementation.
     23 class RtcVideoCapturer
     24     : public cricket::VideoCapturer {
     25  public:
     26   RtcVideoCapturer(const media::VideoCaptureSessionId id,
     27                    VideoCaptureImplManager* vc_manager,
     28                    bool is_screencast);
     29   virtual ~RtcVideoCapturer();
     30 
     31   // cricket::VideoCapturer implementation.
     32   // These methods are accessed from a libJingle worker thread.
     33   virtual cricket::CaptureState Start(
     34       const cricket::VideoFormat& capture_format) OVERRIDE;
     35   virtual void Stop() OVERRIDE;
     36   virtual bool IsRunning() OVERRIDE;
     37   virtual bool GetPreferredFourccs(std::vector<uint32>* fourccs) OVERRIDE;
     38   virtual bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
     39                                     cricket::VideoFormat* best_format) OVERRIDE;
     40   virtual bool IsScreencast() const OVERRIDE;
     41 
     42  private:
     43   // Frame captured callback method.
     44   virtual void OnFrameCaptured(const scoped_refptr<media::VideoFrame>& frame);
     45 
     46   // State change callback, must be called on same thread as Start is called.
     47   void OnStateChange(RtcVideoCaptureDelegate::CaptureState state);
     48 
     49   const bool is_screencast_;
     50   scoped_refptr<RtcVideoCaptureDelegate> delegate_;
     51   VideoCaptureState state_;
     52   base::TimeDelta first_frame_timestamp_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(RtcVideoCapturer);
     55 };
     56 
     57 }  // namespace content
     58 
     59 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_CAPTURER_H_
     60