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/*
* libjingle
* Copyright 2012 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/base/logging.h"
#include "talk/base/thread.h"
#include "talk/media/base/mutedvideocapturer.h"
#include "talk/media/base/videoframe.h"
#if defined(HAVE_WEBRTC_VIDEO)
#include "talk/media/webrtc/webrtcvideoframe.h"
#endif // HAVE_WEBRTC_VIDEO
namespace cricket {
const char MutedVideoCapturer::kCapturerId[] = "muted_camera";
class MutedFramesGenerator : public talk_base::MessageHandler {
public:
explicit MutedFramesGenerator(const VideoFormat& format);
virtual ~MutedFramesGenerator();
// Called every |interval| ms. From |format|.interval given in the
// constructor.
sigslot::signal1<VideoFrame*> SignalFrame;
protected:
virtual void OnMessage(talk_base::Message* message);
private:
talk_base::Thread capture_thread_;
talk_base::scoped_ptr<VideoFrame> muted_frame_;
const VideoFormat format_;
const int interval_;
uint32 create_time_;
};
MutedFramesGenerator::MutedFramesGenerator(const VideoFormat& format)
: format_(format),
interval_(static_cast<int>(format.interval /
talk_base::kNumNanosecsPerMillisec)),
create_time_(talk_base::Time()) {
capture_thread_.Start();
capture_thread_.PostDelayed(interval_, this);
}
MutedFramesGenerator::~MutedFramesGenerator() { capture_thread_.Clear(this); }
void MutedFramesGenerator::OnMessage(talk_base::Message* message) {
// Queue a new frame as soon as possible to minimize drift.
capture_thread_.PostDelayed(interval_, this);
if (!muted_frame_) {
#if defined(HAVE_WEBRTC_VIDEO)
#define VIDEO_FRAME_NAME WebRtcVideoFrame
#endif
#if defined(VIDEO_FRAME_NAME)
muted_frame_.reset(new VIDEO_FRAME_NAME());
#else
return;
#endif
}
uint32 current_timestamp = talk_base::Time();
// Delta between create time and current time will be correct even if there is
// a wraparound since they are unsigned integers.
uint32 elapsed_time = current_timestamp - create_time_;
if (!muted_frame_->InitToBlack(format_.width, format_.height, 1, 1,
elapsed_time, current_timestamp)) {
LOG(LS_ERROR) << "Failed to create a black frame.";
}
SignalFrame(muted_frame_.get());
}
MutedVideoCapturer::MutedVideoCapturer() { SetId(kCapturerId); }
MutedVideoCapturer::~MutedVideoCapturer() { Stop(); }
bool MutedVideoCapturer::GetBestCaptureFormat(const VideoFormat& desired,
VideoFormat* best_format) {
*best_format = desired;
return true;
}
CaptureState MutedVideoCapturer::Start(const VideoFormat& capture_format) {
if (frame_generator_.get()) {
return CS_RUNNING;
}
frame_generator_.reset(new MutedFramesGenerator(capture_format));
frame_generator_->SignalFrame
.connect(this, &MutedVideoCapturer::OnMutedFrame);
SetCaptureFormat(&capture_format);
return CS_RUNNING;
}
void MutedVideoCapturer::Stop() {
frame_generator_.reset();
SetCaptureFormat(NULL);
}
bool MutedVideoCapturer::IsRunning() { return frame_generator_.get() != NULL; }
bool MutedVideoCapturer::GetPreferredFourccs(std::vector<uint32>* fourccs) {
fourccs->clear();
fourccs->push_back(cricket::FOURCC_I420);
return true;
}
void MutedVideoCapturer::OnMutedFrame(VideoFrame* muted_frame) {
SignalVideoFrame(this, muted_frame);
}
} // namespace cricket
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