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      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 <list>
     32 
     33 #include "talk/app/webrtc/mediastreaminterface.h"
     34 #include "talk/app/webrtc/notifier.h"
     35 #include "talk/app/webrtc/videosourceinterface.h"
     36 #include "talk/app/webrtc/videotrackrenderers.h"
     37 #include "talk/media/base/videocapturer.h"
     38 #include "talk/media/base/videocommon.h"
     39 #include "webrtc/base/scoped_ptr.h"
     40 #include "webrtc/base/sigslot.h"
     41 
     42 // VideoSource implements VideoSourceInterface. It owns a
     43 // cricket::VideoCapturer and make sure the camera is started at a resolution
     44 // that honors the constraints.
     45 // The state is set depending on the result of starting the capturer.
     46 // If the constraint can't be met or the capturer fails to start, the state
     47 // transition to kEnded, otherwise it transitions to kLive.
     48 
     49 namespace cricket {
     50 
     51 class ChannelManager;
     52 
     53 }  // namespace cricket
     54 
     55 namespace webrtc {
     56 
     57 class MediaConstraintsInterface;
     58 
     59 class VideoSource : public Notifier<VideoSourceInterface>,
     60                     public sigslot::has_slots<> {
     61  public:
     62   // Creates an instance of VideoSource.
     63   // VideoSource take ownership of |capturer|.
     64   // |constraints| can be NULL and in that case the camera is opened using a
     65   // default resolution.
     66   static rtc::scoped_refptr<VideoSource> Create(
     67       cricket::ChannelManager* channel_manager,
     68       cricket::VideoCapturer* capturer,
     69       const webrtc::MediaConstraintsInterface* constraints,
     70       bool remote);
     71 
     72   SourceState state() const override { return state_; }
     73   bool remote() const override { return remote_; }
     74 
     75   virtual const cricket::VideoOptions* options() const { return &options_; }
     76   virtual cricket::VideoRenderer* FrameInput();
     77 
     78   virtual cricket::VideoCapturer* GetVideoCapturer() {
     79     return video_capturer_.get();
     80   }
     81 
     82   void Stop() override;
     83   void Restart() override;
     84 
     85   // |output| will be served video frames as long as the underlying capturer
     86   // is running video frames.
     87   virtual void AddSink(cricket::VideoRenderer* output);
     88   virtual void RemoveSink(cricket::VideoRenderer* output);
     89 
     90  protected:
     91   VideoSource(cricket::ChannelManager* channel_manager,
     92               cricket::VideoCapturer* capturer,
     93               bool remote);
     94   virtual ~VideoSource();
     95   void Initialize(const webrtc::MediaConstraintsInterface* constraints);
     96 
     97  private:
     98   void OnStateChange(cricket::VideoCapturer* capturer,
     99                      cricket::CaptureState capture_state);
    100   void SetState(SourceState new_state);
    101 
    102   cricket::ChannelManager* channel_manager_;
    103   rtc::scoped_ptr<cricket::VideoCapturer> video_capturer_;
    104   rtc::scoped_ptr<cricket::VideoRenderer> frame_input_;
    105 
    106   std::list<cricket::VideoRenderer*> sinks_;
    107 
    108   cricket::VideoFormat format_;
    109   cricket::VideoOptions options_;
    110   SourceState state_;
    111   const bool remote_;
    112 };
    113 
    114 }  // namespace webrtc
    115 
    116 #endif  // TALK_APP_WEBRTC_VIDEOSOURCE_H_
    117