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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_VIDEOTRACKRENDERERS_H_
     29 #define TALK_APP_WEBRTC_VIDEOTRACKRENDERERS_H_
     30 
     31 #include <vector>
     32 
     33 #include "talk/app/webrtc/mediastreaminterface.h"
     34 #include "talk/base/criticalsection.h"
     35 #include "talk/media/base/videorenderer.h"
     36 
     37 namespace webrtc {
     38 
     39 // Class used for rendering cricket::VideoFrames to multiple renderers of type
     40 // VideoRendererInterface.
     41 // Each VideoTrack owns a VideoTrackRenderers instance.
     42 // The class is thread safe. Rendering to the added VideoRendererInterfaces is
     43 // done on the same thread as the cricket::VideoRenderer.
     44 class VideoTrackRenderers : public cricket::VideoRenderer {
     45  public:
     46   VideoTrackRenderers();
     47   ~VideoTrackRenderers();
     48 
     49   // Implements cricket::VideoRenderer
     50   virtual bool SetSize(int width, int height, int reserved);
     51   virtual bool RenderFrame(const cricket::VideoFrame* frame);
     52 
     53   void AddRenderer(VideoRendererInterface* renderer);
     54   void RemoveRenderer(VideoRendererInterface* renderer);
     55   void SetEnabled(bool enable);
     56 
     57  private:
     58   struct RenderObserver {
     59     explicit RenderObserver(VideoRendererInterface* renderer)
     60         : renderer_(renderer),
     61           size_set_(false) {
     62     }
     63     VideoRendererInterface* renderer_;
     64     bool size_set_;
     65   };
     66 
     67   int width_;
     68   int height_;
     69   bool enabled_;
     70   std::vector<RenderObserver> renderers_;
     71 
     72   talk_base::CriticalSection critical_section_;  // Protects the above variables
     73 };
     74 
     75 }  // namespace webrtc
     76 
     77 #endif  // TALK_APP_WEBRTC_VIDEOTRACKRENDERERS_H_
     78