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
43namespace cricket {
44
45class VideoCapturer;
46class VideoProcessor;
47class VideoRenderer;
48
49class 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 rtc::CriticalSection capture_crit_;
87};
88
89}  // namespace cricket
90
91#endif  // TALK_MEDIA_BASE_CAPTURERENDERADAPTER_H_
92