Home | History | Annotate | Download | only in webrtc 
      1 /*
      2  * libjingle
      3  * Copyright 2012, 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_APP_WEBRTC_VIDEOSOURCE_H_
     29 #define TALK_APP_WEBRTC_VIDEOSOURCE_H_
     30 
     31 #include "talk/app/webrtc/mediastreaminterface.h"
     32 #include "talk/app/webrtc/notifier.h"
     33 #include "talk/app/webrtc/videosourceinterface.h"
     34 #include "talk/app/webrtc/videotrackrenderers.h"
     35 #include "talk/media/base/videocapturer.h"
     36 #include "talk/media/base/videocommon.h"
     37 #include "webrtc/base/scoped_ptr.h"
     38 #include "webrtc/base/sigslot.h"
     39 
     40 // VideoSource implements VideoSourceInterface. It owns a
     41 // cricket::VideoCapturer and make sure the camera is started at a resolution
     42 // that honors the constraints.
     43 // The state is set depending on the result of starting the capturer.
     44 // If the constraint can't be met or the capturer fails to start, the state
     45 // transition to kEnded, otherwise it transitions to kLive.
     46 
     47 namespace cricket {
     48 
     49 class ChannelManager;
     50 
     51 }  // namespace cricket
     52 
     53 namespace webrtc {
     54 
     55 class MediaConstraintsInterface;
     56 
     57 class VideoSource : public Notifier<VideoSourceInterface>,
     58                     public sigslot::has_slots<> {
     59  public:
     60   // Creates an instance of VideoSource.
     61   // VideoSource take ownership of |capturer|.
     62   // |constraints| can be NULL and in that case the camera is opened using a
     63   // default resolution.
     64   static rtc::scoped_refptr<VideoSource> Create(
     65       cricket::ChannelManager* channel_manager,
     66       cricket::VideoCapturer* capturer,
     67       const webrtc::MediaConstraintsInterface* constraints);
     68 
     69   virtual SourceState state() const { return state_; }
     70   virtual const cricket::VideoOptions* options() const { return &options_; }
     71   virtual cricket::VideoRenderer* FrameInput();
     72 
     73   virtual cricket::VideoCapturer* GetVideoCapturer() {
     74     return video_capturer_.get();
     75   }
     76   // |output| will be served video frames as long as the underlying capturer
     77   // is running video frames.
     78   virtual void AddSink(cricket::VideoRenderer* output);
     79   virtual void RemoveSink(cricket::VideoRenderer* output);
     80 
     81  protected:
     82   VideoSource(cricket::ChannelManager* channel_manager,
     83               cricket::VideoCapturer* capturer);
     84   virtual ~VideoSource();
     85   void Initialize(const webrtc::MediaConstraintsInterface* constraints);
     86 
     87  private:
     88   void OnStateChange(cricket::VideoCapturer* capturer,
     89                      cricket::CaptureState capture_state);
     90   void SetState(SourceState new_state);
     91 
     92   cricket::ChannelManager* channel_manager_;
     93   rtc::scoped_ptr<cricket::VideoCapturer> video_capturer_;
     94   rtc::scoped_ptr<cricket::VideoRenderer> frame_input_;
     95 
     96   cricket::VideoFormat format_;
     97   cricket::VideoOptions options_;
     98   SourceState state_;
     99 };
    100 
    101 }  // namespace webrtc
    102 
    103 #endif  // TALK_APP_WEBRTC_VIDEOSOURCE_H_
    104