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      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
     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