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28 // The CaptureManager class manages VideoCapturers to make it possible to share
29 // the same VideoCapturers across multiple instances. E.g. if two instances of
30 // some class want to listen to same VideoCapturer they can't individually stop
31 // and start capturing as doing so will affect the other instance.
32 // The class employs reference counting on starting and stopping of capturing of
33 // frames such that if anyone is still listening it will not be stopped. The
34 // class also provides APIs for attaching VideoRenderers to a specific capturer
35 // such that the VideoRenderers are fed frames directly from the capturer. In
36 // addition, these frames can be altered before being sent to the capturers by
37 // way of VideoProcessors.
38 // CaptureManager is Thread-unsafe. This means that none of its APIs may be
39 // called concurrently. Note that callbacks are called by the VideoCapturer's
40 // thread which is normally a separate unmarshalled thread and thus normally
41 // require lock protection.
43 #ifndef TALK_MEDIA_BASE_CAPTUREMANAGER_H_
44 #define TALK_MEDIA_BASE_CAPTUREMANAGER_H_
49 #include "talk/media/base/capturerenderadapter.h"
50 #include "talk/media/base/videocommon.h"
51 #include "webrtc/base/sigslotrepeater.h"
58 class VideoCapturerState;
60 class CaptureManager : public sigslot::has_slots<> {
68 virtual ~CaptureManager();
70 virtual bool StartVideoCapture(VideoCapturer* video_capturer,
71 const VideoFormat& desired_format);
72 virtual bool StopVideoCapture(VideoCapturer* video_capturer,
73 const VideoFormat& format);
75 // Possibly restarts the capturer. If |options| is set to kRequestRestart,
76 // the CaptureManager chooses whether this request can be handled with the
77 // current state or if a restart is actually needed. If |options| is set to
78 // kForceRestart, the capturer is restarted.
79 virtual bool RestartVideoCapture(VideoCapturer* video_capturer,
80 const VideoFormat& previous_format,
81 const VideoFormat& desired_format,
82 RestartOptions options);
84 virtual bool AddVideoRenderer(VideoCapturer* video_capturer,
85 VideoRenderer* video_renderer);
86 virtual bool RemoveVideoRenderer(VideoCapturer* video_capturer,
87 VideoRenderer* video_renderer);
89 virtual bool AddVideoProcessor(VideoCapturer* video_capturer,
90 VideoProcessor* video_processor);
91 virtual bool RemoveVideoProcessor(VideoCapturer* video_capturer,
92 VideoProcessor* video_processor);
94 sigslot::repeater2<VideoCapturer*, CaptureState> SignalCapturerStateChange;
97 typedef std::map<VideoCapturer*, VideoCapturerState*> CaptureStates;
99 bool IsCapturerRegistered(VideoCapturer* video_capturer) const;
100 bool RegisterVideoCapturer(VideoCapturer* video_capturer);
101 void UnregisterVideoCapturer(VideoCapturerState* capture_state);
103 bool StartWithBestCaptureFormat(VideoCapturerState* capture_info,
104 VideoCapturer* video_capturer);
106 VideoCapturerState* GetCaptureState(VideoCapturer* video_capturer) const;
107 CaptureRenderAdapter* GetAdapter(VideoCapturer* video_capturer) const;
109 CaptureStates capture_states_;
112 } // namespace cricket
114 #endif // TALK_MEDIA_BASE_CAPTUREMANAGER_H_