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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/media/base/videocapturer.h"
40 #include "webrtc/base/criticalsection.h"
41 #include "webrtc/base/sigslot.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 
video_capturer()57   VideoCapturer* video_capturer() { return video_capturer_; }
58  private:
59   struct VideoRendererInfo {
VideoRendererInfoVideoRendererInfo60     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 rtc::CriticalSection capture_crit_;
87 };
88 
89 }  // namespace cricket
90 
91 #endif  // TALK_MEDIA_BASE_CAPTURERENDERADAPTER_H_
92