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 
49 namespace cricket {
50 
51 class ChannelManager;
52 
53 }  // namespace cricket
54 
55 namespace webrtc {
56 
57 class MediaConstraintsInterface;
58 
59 class 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 
state()72   SourceState state() const override { return state_; }
remote()73   bool remote() const override { return remote_; }
74 
options()75   virtual const cricket::VideoOptions* options() const { return &options_; }
76   virtual cricket::VideoRenderer* FrameInput();
77 
GetVideoCapturer()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