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
49namespace cricket {
50
51class ChannelManager;
52
53}  // namespace cricket
54
55namespace webrtc {
56
57class MediaConstraintsInterface;
58
59class 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