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      1 /*
      2  * libjingle
      3  * Copyright 2004 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
     29 #define TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
     30 
     31 #ifdef HAVE_WEBRTC_VIDEO
     32 
     33 #include <string>
     34 #include <vector>
     35 
     36 #include "talk/media/base/videocapturer.h"
     37 #include "talk/media/webrtc/webrtcvideoframe.h"
     38 #include "webrtc/base/asyncinvoker.h"
     39 #include "webrtc/base/messagehandler.h"
     40 #include "webrtc/base/scoped_ptr.h"
     41 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
     42 #include "webrtc/modules/video_capture/video_capture.h"
     43 
     44 namespace cricket {
     45 
     46 // Factory to allow injection of a VCM impl into WebRtcVideoCapturer.
     47 // DeviceInfos do not have a Release() and therefore need an explicit Destroy().
     48 class WebRtcVcmFactoryInterface {
     49  public:
     50   virtual ~WebRtcVcmFactoryInterface() {}
     51   virtual webrtc::VideoCaptureModule* Create(
     52       int id, const char* device) = 0;
     53   virtual webrtc::VideoCaptureModule::DeviceInfo* CreateDeviceInfo(int id) = 0;
     54   virtual void DestroyDeviceInfo(
     55       webrtc::VideoCaptureModule::DeviceInfo* info) = 0;
     56 };
     57 
     58 // WebRTC-based implementation of VideoCapturer.
     59 class WebRtcVideoCapturer : public VideoCapturer,
     60                             public webrtc::VideoCaptureDataCallback {
     61  public:
     62   WebRtcVideoCapturer();
     63   explicit WebRtcVideoCapturer(WebRtcVcmFactoryInterface* factory);
     64   virtual ~WebRtcVideoCapturer();
     65 
     66   bool Init(const Device& device);
     67   bool Init(webrtc::VideoCaptureModule* module);
     68 
     69   // Override virtual methods of the parent class VideoCapturer.
     70   virtual bool GetBestCaptureFormat(const VideoFormat& desired,
     71                                     VideoFormat* best_format);
     72   virtual CaptureState Start(const VideoFormat& capture_format);
     73   virtual void Stop();
     74   virtual bool IsRunning();
     75   virtual bool IsScreencast() const { return false; }
     76   virtual bool SetApplyRotation(bool enable);
     77 
     78  protected:
     79   // Override virtual methods of the parent class VideoCapturer.
     80   virtual bool GetPreferredFourccs(std::vector<uint32_t>* fourccs);
     81 
     82  private:
     83   // Callback when a frame is captured by camera.
     84   virtual void OnIncomingCapturedFrame(const int32_t id,
     85                                        const webrtc::VideoFrame& frame);
     86   virtual void OnCaptureDelayChanged(const int32_t id,
     87                                      const int32_t delay);
     88 
     89   // Used to signal captured frames on the same thread as invoked Start().
     90   // With WebRTC's current VideoCapturer implementations, this will mean a
     91   // thread hop, but in other implementations (e.g. Chrome) it will be called
     92   // directly from OnIncomingCapturedFrame.
     93   // TODO(tommi): Remove this workaround when we've updated the WebRTC capturers
     94   // to follow the same contract.
     95   void SignalFrameCapturedOnStartThread(const webrtc::VideoFrame& frame);
     96 
     97   rtc::scoped_ptr<WebRtcVcmFactoryInterface> factory_;
     98   webrtc::VideoCaptureModule* module_;
     99   int captured_frames_;
    100   std::vector<uint8_t> capture_buffer_;
    101   rtc::Thread* start_thread_;  // Set in Start(), unset in Stop();
    102 
    103   rtc::scoped_ptr<rtc::AsyncInvoker> async_invoker_;
    104 };
    105 
    106 struct WebRtcCapturedFrame : public CapturedFrame {
    107  public:
    108   WebRtcCapturedFrame(const webrtc::VideoFrame& frame,
    109                       void* buffer,
    110                       size_t length);
    111 };
    112 
    113 }  // namespace cricket
    114 
    115 #endif  // HAVE_WEBRTC_VIDEO
    116 #endif  // TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
    117