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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 // This file contains the class CaptureRenderAdapter. The class connects a
     29 // VideoCapturer to any number of VideoRenders such that the former feeds the
     30 // latter.
     31 // CaptureRenderAdapter is Thread-unsafe. This means that none of its APIs may
     32 // be called concurrently.
     33 
     34 #ifndef TALK_MEDIA_BASE_CAPTURERENDERADAPTER_H_
     35 #define TALK_MEDIA_BASE_CAPTURERENDERADAPTER_H_
     36 
     37 #include <vector>
     38 
     39 #include "talk/base/criticalsection.h"
     40 #include "talk/base/sigslot.h"
     41 #include "talk/media/base/videocapturer.h"
     42 
     43 namespace cricket {
     44 
     45 class VideoCapturer;
     46 class VideoProcessor;
     47 class VideoRenderer;
     48 
     49 class CaptureRenderAdapter : public sigslot::has_slots<> {
     50  public:
     51   static CaptureRenderAdapter* Create(VideoCapturer* video_capturer);
     52   ~CaptureRenderAdapter();
     53 
     54   bool AddRenderer(VideoRenderer* video_renderer);
     55   bool RemoveRenderer(VideoRenderer* video_renderer);
     56 
     57   VideoCapturer* video_capturer() { return video_capturer_; }
     58  private:
     59   struct VideoRendererInfo {
     60     explicit VideoRendererInfo(VideoRenderer* r)
     61         : renderer(r),
     62           render_width(0),
     63           render_height(0) {
     64     }
     65     VideoRenderer* renderer;
     66     size_t render_width;
     67     size_t render_height;
     68   };
     69 
     70   // Just pointers since ownership is not handed over to this class.
     71   typedef std::vector<VideoRendererInfo> VideoRenderers;
     72 
     73   explicit CaptureRenderAdapter(VideoCapturer* video_capturer);
     74   void Init();
     75 
     76   // Callback for frames received from the capturer.
     77   void OnVideoFrame(VideoCapturer* capturer, const VideoFrame* video_frame);
     78 
     79   void MaybeSetRenderingSize(const VideoFrame* frame);
     80 
     81   bool IsRendererRegistered(const VideoRenderer& video_renderer) const;
     82 
     83   VideoRenderers video_renderers_;
     84   VideoCapturer* video_capturer_;
     85   // Critical section synchronizing the capture thread.
     86   mutable talk_base::CriticalSection capture_crit_;
     87 };
     88 
     89 }  // namespace cricket
     90 
     91 #endif  // TALK_MEDIA_BASE_CAPTURERENDERADAPTER_H_
     92