1// Copyright 2014 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 REMOTING_HOST_CAST_VIDEO_CAPTURER_ADAPTER_H_ 6#define REMOTING_HOST_CAST_VIDEO_CAPTURER_ADAPTER_H_ 7 8#include <vector> 9 10#include "base/memory/scoped_ptr.h" 11#include "base/threading/thread_checker.h" 12#include "base/timer/timer.h" 13#include "third_party/libjingle/source/talk/media/base/videocapturer.h" 14#include "third_party/webrtc/modules/desktop_capture/screen_capturer.h" 15 16namespace base { 17class SingleThreadTaskRunner; 18} // namespace base 19 20namespace webrtc { 21class DesktopFrame; 22} // namespace webrtc 23 24namespace remoting { 25 26// This class controls the capture of video frames from the desktop and is used 27// to construct a VideoSource as part of the webrtc PeerConnection API. 28// CastVideoCapturerAdapter acts as an adapter between webrtc::DesktopCapturer 29// and the cricket::VideoCapturer interface, which it implements. It is used 30// to construct a cricket::VideoSource for a PeerConnection, to capture frames 31// of the desktop. As indicated in the base implementation, Start() and Stop() 32// should be called on the same thread. 33class CastVideoCapturerAdapter : public cricket::VideoCapturer, 34 public webrtc::DesktopCapturer::Callback { 35 public: 36 explicit CastVideoCapturerAdapter( 37 scoped_ptr<webrtc::DesktopCapturer> capturer); 38 39 virtual ~CastVideoCapturerAdapter(); 40 41 // webrtc::DesktopCapturer::Callback implementation. 42 virtual webrtc::SharedMemory* CreateSharedMemory(size_t size) OVERRIDE; 43 // Converts |frame| to a cricket::CapturedFrame and emits that via 44 // SignalFrameCaptured for the base::VideoCapturer implementation to process. 45 virtual void OnCaptureCompleted(webrtc::DesktopFrame* frame) OVERRIDE; 46 47 // cricket::VideoCapturer implementation. 48 virtual bool GetBestCaptureFormat(const cricket::VideoFormat& desired, 49 cricket::VideoFormat* best_format) OVERRIDE; 50 virtual cricket::CaptureState Start( 51 const cricket::VideoFormat& capture_format) OVERRIDE; 52 virtual bool Pause(bool pause) OVERRIDE; 53 virtual void Stop() OVERRIDE; 54 virtual bool IsRunning() OVERRIDE; 55 virtual bool IsScreencast() const OVERRIDE; 56 virtual bool GetPreferredFourccs(std::vector<uint32>* fourccs) OVERRIDE; 57 58 private: 59 // Kicks off the next frame capture using |desktop_capturer_|. 60 // The captured frame will be passed to OnCaptureCompleted(). 61 void CaptureNextFrame(); 62 63 // |thread_checker_| is bound to the peer connection worker thread. 64 base::ThreadChecker thread_checker_; 65 66 // Used to capture frames. 67 scoped_ptr<webrtc::DesktopCapturer> desktop_capturer_; 68 69 // Used to schedule periodic screen captures. 70 scoped_ptr<base::RepeatingTimer<CastVideoCapturerAdapter> > capture_timer_; 71 72 // Used to set the elapsed_time attribute of captured frames. 73 base::TimeTicks start_time_; 74 75 DISALLOW_COPY_AND_ASSIGN(CastVideoCapturerAdapter); 76}; 77 78} // namespace remoting 79 80#endif // REMOTING_HOST_CAST_VIDEO_CAPTURER_ADAPTER_H_ 81 82