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 CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_ 6 #define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_ 7 8 #include <vector> 9 10 #include "base/compiler_specific.h" 11 #include "base/message_loop/message_loop_proxy.h" 12 #include "base/threading/thread_checker.h" 13 #include "content/common/content_export.h" 14 #include "media/base/video_frame.h" 15 #include "media/video/capture/video_capture_types.h" 16 #include "third_party/libjingle/source/talk/media/base/videocapturer.h" 17 18 namespace content { 19 20 // WebRtcVideoCapturerAdapter implements a simple cricket::VideoCapturer that is 21 // used for VideoCapturing in libJingle and especially in PeerConnections. 22 // The class is created and destroyed on the main render thread. 23 // PeerConnection access cricket::VideoCapturer from a libJingle worker thread. 24 // An instance of WebRtcVideoCapturerAdapter is owned by an instance of 25 // webrtc::VideoSourceInterface in libJingle. The implementation of 26 // webrtc::VideoSourceInterface guarantees that this object is not deleted 27 // while it is still used in libJingle. 28 class CONTENT_EXPORT WebRtcVideoCapturerAdapter NON_EXPORTED_BASE(public cricket::VideoCapturer)29 : NON_EXPORTED_BASE(public cricket::VideoCapturer) { 30 public: 31 explicit WebRtcVideoCapturerAdapter(bool is_screencast); 32 virtual ~WebRtcVideoCapturerAdapter(); 33 34 // OnFrameCaptured delivers video frames to libjingle. It must be called on 35 // libjingles worker thread. 36 // This method is virtual for testing purposes. 37 virtual void OnFrameCaptured(const scoped_refptr<media::VideoFrame>& frame); 38 39 private: 40 // cricket::VideoCapturer implementation. 41 // These methods are accessed from a libJingle worker thread. 42 virtual cricket::CaptureState Start( 43 const cricket::VideoFormat& capture_format) OVERRIDE; 44 virtual void Stop() OVERRIDE; 45 virtual bool IsRunning() OVERRIDE; 46 virtual bool GetPreferredFourccs(std::vector<uint32>* fourccs) OVERRIDE; 47 virtual bool GetBestCaptureFormat(const cricket::VideoFormat& desired, 48 cricket::VideoFormat* best_format) OVERRIDE; 49 virtual bool IsScreencast() const OVERRIDE; 50 51 void UpdateI420Buffer(const scoped_refptr<media::VideoFrame>& src); 52 53 // |thread_checker_| is bound to the libjingle worker thread. 54 base::ThreadChecker thread_checker_; 55 56 const bool is_screencast_; 57 bool running_; 58 base::TimeDelta first_frame_timestamp_; 59 // |buffer_| used if cropping is needed. It is created only if needed and 60 // owned by WebRtcVideoCapturerAdapter. If its created, it exists until 61 // WebRtcVideoCapturerAdapter is destroyed. 62 uint8* buffer_; 63 size_t buffer_size_; 64 scoped_ptr<cricket::CapturedFrame> captured_frame_; 65 66 DISALLOW_COPY_AND_ASSIGN(WebRtcVideoCapturerAdapter); 67 }; 68 69 } // namespace content 70 71 #endif // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_ 72