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 "talk/app/webrtc/mediastreaminterface.h"
32#include "talk/app/webrtc/notifier.h"
33#include "talk/app/webrtc/videosourceinterface.h"
34#include "talk/app/webrtc/videotrackrenderers.h"
35#include "talk/media/base/videocapturer.h"
36#include "talk/media/base/videocommon.h"
37#include "webrtc/base/scoped_ptr.h"
38#include "webrtc/base/sigslot.h"
39
40// VideoSource implements VideoSourceInterface. It owns a
41// cricket::VideoCapturer and make sure the camera is started at a resolution
42// that honors the constraints.
43// The state is set depending on the result of starting the capturer.
44// If the constraint can't be met or the capturer fails to start, the state
45// transition to kEnded, otherwise it transitions to kLive.
46
47namespace cricket {
48
49class ChannelManager;
50
51}  // namespace cricket
52
53namespace webrtc {
54
55class MediaConstraintsInterface;
56
57class VideoSource : public Notifier<VideoSourceInterface>,
58                    public sigslot::has_slots<> {
59 public:
60  // Creates an instance of VideoSource.
61  // VideoSource take ownership of |capturer|.
62  // |constraints| can be NULL and in that case the camera is opened using a
63  // default resolution.
64  static rtc::scoped_refptr<VideoSource> Create(
65      cricket::ChannelManager* channel_manager,
66      cricket::VideoCapturer* capturer,
67      const webrtc::MediaConstraintsInterface* constraints);
68
69  virtual SourceState state() const { return state_; }
70  virtual const cricket::VideoOptions* options() const { return &options_; }
71  virtual cricket::VideoRenderer* FrameInput();
72
73  virtual cricket::VideoCapturer* GetVideoCapturer() {
74    return video_capturer_.get();
75  }
76  // |output| will be served video frames as long as the underlying capturer
77  // is running video frames.
78  virtual void AddSink(cricket::VideoRenderer* output);
79  virtual void RemoveSink(cricket::VideoRenderer* output);
80
81 protected:
82  VideoSource(cricket::ChannelManager* channel_manager,
83              cricket::VideoCapturer* capturer);
84  virtual ~VideoSource();
85  void Initialize(const webrtc::MediaConstraintsInterface* constraints);
86
87 private:
88  void OnStateChange(cricket::VideoCapturer* capturer,
89                     cricket::CaptureState capture_state);
90  void SetState(SourceState new_state);
91
92  cricket::ChannelManager* channel_manager_;
93  rtc::scoped_ptr<cricket::VideoCapturer> video_capturer_;
94  rtc::scoped_ptr<cricket::VideoRenderer> frame_input_;
95
96  cricket::VideoFormat format_;
97  cricket::VideoOptions options_;
98  SourceState state_;
99};
100
101}  // namespace webrtc
102
103#endif  // TALK_APP_WEBRTC_VIDEOSOURCE_H_
104