28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
136 lines
4.6 KiB
C++
136 lines
4.6 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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#include "talk/base/logging.h"
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#include "talk/base/thread.h"
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#include "talk/media/base/mutedvideocapturer.h"
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#include "talk/media/base/videoframe.h"
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#if defined(HAVE_WEBRTC_VIDEO)
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#include "talk/media/webrtc/webrtcvideoframe.h"
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#endif // HAVE_WEBRTC_VIDEO
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namespace cricket {
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const char MutedVideoCapturer::kCapturerId[] = "muted_camera";
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class MutedFramesGenerator : public talk_base::MessageHandler {
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public:
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explicit MutedFramesGenerator(const VideoFormat& format);
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virtual ~MutedFramesGenerator();
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// Called every |interval| ms. From |format|.interval given in the
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// constructor.
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sigslot::signal1<VideoFrame*> SignalFrame;
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protected:
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virtual void OnMessage(talk_base::Message* message);
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private:
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talk_base::Thread capture_thread_;
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talk_base::scoped_ptr<VideoFrame> muted_frame_;
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const VideoFormat format_;
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const int interval_;
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uint32 create_time_;
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};
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MutedFramesGenerator::MutedFramesGenerator(const VideoFormat& format)
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: format_(format),
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interval_(static_cast<int>(format.interval /
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talk_base::kNumNanosecsPerMillisec)),
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create_time_(talk_base::Time()) {
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capture_thread_.Start();
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capture_thread_.PostDelayed(interval_, this);
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}
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MutedFramesGenerator::~MutedFramesGenerator() { capture_thread_.Clear(this); }
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void MutedFramesGenerator::OnMessage(talk_base::Message* message) {
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// Queue a new frame as soon as possible to minimize drift.
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capture_thread_.PostDelayed(interval_, this);
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if (!muted_frame_) {
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#if defined(HAVE_WEBRTC_VIDEO)
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#define VIDEO_FRAME_NAME WebRtcVideoFrame
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#endif
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#if defined(VIDEO_FRAME_NAME)
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muted_frame_.reset(new VIDEO_FRAME_NAME());
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#else
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return;
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#endif
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}
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uint32 current_timestamp = talk_base::Time();
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// Delta between create time and current time will be correct even if there is
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// a wraparound since they are unsigned integers.
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uint32 elapsed_time = current_timestamp - create_time_;
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if (!muted_frame_->InitToBlack(format_.width, format_.height, 1, 1,
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elapsed_time, current_timestamp)) {
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LOG(LS_ERROR) << "Failed to create a black frame.";
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}
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SignalFrame(muted_frame_.get());
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}
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MutedVideoCapturer::MutedVideoCapturer() { SetId(kCapturerId); }
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MutedVideoCapturer::~MutedVideoCapturer() { Stop(); }
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bool MutedVideoCapturer::GetBestCaptureFormat(const VideoFormat& desired,
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VideoFormat* best_format) {
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*best_format = desired;
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return true;
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}
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CaptureState MutedVideoCapturer::Start(const VideoFormat& capture_format) {
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if (frame_generator_.get()) {
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return CS_RUNNING;
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}
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frame_generator_.reset(new MutedFramesGenerator(capture_format));
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frame_generator_->SignalFrame
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.connect(this, &MutedVideoCapturer::OnMutedFrame);
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SetCaptureFormat(&capture_format);
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return CS_RUNNING;
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}
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void MutedVideoCapturer::Stop() {
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frame_generator_.reset();
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SetCaptureFormat(NULL);
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}
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bool MutedVideoCapturer::IsRunning() { return frame_generator_.get() != NULL; }
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bool MutedVideoCapturer::GetPreferredFourccs(std::vector<uint32>* fourccs) {
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fourccs->clear();
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fourccs->push_back(cricket::FOURCC_I420);
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return true;
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}
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void MutedVideoCapturer::OnMutedFrame(VideoFrame* muted_frame) {
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SignalVideoFrame(this, muted_frame);
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}
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} // namespace cricket
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