4aef5fef18
It looks like it is being used single threadedly, except that in some cases it is created and/or destroyed in threads other than the one running its operations. As such, CaptureManager() contains 'thread_checker_.DetachFromThread()' and ~CaptureManager() does not have a DCHECK. BUG= R=perkj@webrtc.org, tommi@webrtc.org Review URL: https://webrtc-codereview.appspot.com/36279004 Cr-Commit-Position: refs/heads/master@{#8498} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8498 4adac7df-926f-26a2-2b94-8c16560cd09d
117 lines
5.0 KiB
C++
117 lines
5.0 KiB
C++
/*
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* libjingle
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* Copyright 2012 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// The CaptureManager class manages VideoCapturers to make it possible to share
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// the same VideoCapturers across multiple instances. E.g. if two instances of
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// some class want to listen to same VideoCapturer they can't individually stop
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// and start capturing as doing so will affect the other instance.
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// The class employs reference counting on starting and stopping of capturing of
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// frames such that if anyone is still listening it will not be stopped. The
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// class also provides APIs for attaching VideoRenderers to a specific capturer
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// such that the VideoRenderers are fed frames directly from the capturer. In
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// addition, these frames can be altered before being sent to the capturers by
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// way of VideoProcessors.
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// CaptureManager is Thread-unsafe. This means that none of its APIs may be
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// called concurrently. Note that callbacks are called by the VideoCapturer's
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// thread which is normally a separate unmarshalled thread and thus normally
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// require lock protection.
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#ifndef TALK_MEDIA_BASE_CAPTUREMANAGER_H_
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#define TALK_MEDIA_BASE_CAPTUREMANAGER_H_
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#include <map>
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#include <vector>
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#include "talk/media/base/capturerenderadapter.h"
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#include "talk/media/base/videocommon.h"
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#include "webrtc/base/sigslotrepeater.h"
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#include "webrtc/base/thread_checker.h"
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namespace cricket {
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class VideoCapturer;
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class VideoProcessor;
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class VideoRenderer;
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class VideoCapturerState;
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class CaptureManager : public sigslot::has_slots<> {
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public:
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enum RestartOptions {
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kRequestRestart,
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kForceRestart
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};
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CaptureManager();
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virtual ~CaptureManager();
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virtual bool StartVideoCapture(VideoCapturer* video_capturer,
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const VideoFormat& desired_format);
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virtual bool StopVideoCapture(VideoCapturer* video_capturer,
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const VideoFormat& format);
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// Possibly restarts the capturer. If |options| is set to kRequestRestart,
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// the CaptureManager chooses whether this request can be handled with the
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// current state or if a restart is actually needed. If |options| is set to
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// kForceRestart, the capturer is restarted.
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virtual bool RestartVideoCapture(VideoCapturer* video_capturer,
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const VideoFormat& previous_format,
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const VideoFormat& desired_format,
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RestartOptions options);
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virtual bool AddVideoRenderer(VideoCapturer* video_capturer,
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VideoRenderer* video_renderer);
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virtual bool RemoveVideoRenderer(VideoCapturer* video_capturer,
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VideoRenderer* video_renderer);
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virtual bool AddVideoProcessor(VideoCapturer* video_capturer,
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VideoProcessor* video_processor);
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virtual bool RemoveVideoProcessor(VideoCapturer* video_capturer,
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VideoProcessor* video_processor);
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sigslot::repeater2<VideoCapturer*, CaptureState> SignalCapturerStateChange;
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private:
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typedef std::map<VideoCapturer*, VideoCapturerState*> CaptureStates;
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bool IsCapturerRegistered(VideoCapturer* video_capturer) const;
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bool RegisterVideoCapturer(VideoCapturer* video_capturer);
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void UnregisterVideoCapturer(VideoCapturerState* capture_state);
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bool StartWithBestCaptureFormat(VideoCapturerState* capture_info,
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VideoCapturer* video_capturer);
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VideoCapturerState* GetCaptureState(VideoCapturer* video_capturer) const;
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CaptureRenderAdapter* GetAdapter(VideoCapturer* video_capturer) const;
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rtc::ThreadChecker thread_checker_;
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CaptureStates capture_states_;
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};
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} // namespace cricket
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#endif // TALK_MEDIA_BASE_CAPTUREMANAGER_H_
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