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/*
* Copyright 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "pc/video_track.h"
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
#include "api/make_ref_counted.h"
#include "api/media_stream_interface.h"
#include "api/media_stream_track.h"
#include "api/notifier.h"
#include "api/scoped_refptr.h"
#include "api/sequence_checker.h"
#include "api/video/video_frame.h"
#include "api/video/video_sink_interface.h"
#include "api/video/video_source_interface.h"
#include "media/base/video_source_base.h"
#include "pc/video_track_source_proxy.h"
#include "rtc_base/thread.h"
namespace webrtc {
VideoTrack::VideoTrack(
absl::string_view label,
scoped_refptr<VideoTrackSourceProxyWithInternal<VideoTrackSourceInterface>>
source,
Thread* worker_thread)
: MediaStreamTrack<VideoTrackInterface>(label),
worker_thread_(worker_thread),
video_source_(std::move(source)),
content_hint_(ContentHint::kNone) {
RTC_DCHECK_RUN_ON(&signaling_thread_);
// Detach the thread checker for VideoSourceBaseGuarded since we'll make calls
// to VideoSourceBaseGuarded on the worker thread, but we're currently on the
// signaling thread.
source_sequence_.Detach();
video_source_->RegisterObserver(this);
}
VideoTrack::~VideoTrack() {
RTC_DCHECK_RUN_ON(&signaling_thread_);
video_source_->UnregisterObserver(this);
}
std::string VideoTrack::kind() const {
return kVideoKind;
}
// AddOrUpdateSink and RemoveSink should be called on the worker
// thread.
void VideoTrack::AddOrUpdateSink(VideoSinkInterface<VideoFrame>* sink,
const VideoSinkWants& wants) {
RTC_DCHECK_RUN_ON(worker_thread_);
VideoSourceBaseGuarded::AddOrUpdateSink(sink, wants);
VideoSinkWants modified_wants = wants;
modified_wants.black_frames = !enabled_w_;
video_source_->internal()->AddOrUpdateSink(sink, modified_wants);
}
void VideoTrack::RemoveSink(VideoSinkInterface<VideoFrame>* sink) {
RTC_DCHECK_RUN_ON(worker_thread_);
VideoSourceBaseGuarded::RemoveSink(sink);
video_source_->internal()->RemoveSink(sink);
}
void VideoTrack::RequestRefreshFrame() {
RTC_DCHECK_RUN_ON(worker_thread_);
video_source_->internal()->RequestRefreshFrame();
}
VideoTrackSourceInterface* VideoTrack::GetSource() const {
// Callable from any thread.
return video_source_.get();
}
VideoTrackSourceInterface* VideoTrack::GetSourceInternal() const {
return video_source_->internal();
}
VideoTrackInterface::ContentHint VideoTrack::content_hint() const {
RTC_DCHECK_RUN_ON(&signaling_thread_);
return content_hint_;
}
void VideoTrack::set_content_hint(ContentHint hint) {
RTC_DCHECK_RUN_ON(&signaling_thread_);
if (content_hint_ == hint)
return;
content_hint_ = hint;
Notifier<VideoTrackInterface>::FireOnChanged();
}
bool VideoTrack::set_enabled(bool enable) {
RTC_DCHECK_RUN_ON(&signaling_thread_);
bool ret = MediaStreamTrack<VideoTrackInterface>::set_enabled(enable);
worker_thread_->BlockingCall([&]() {
RTC_DCHECK_RUN_ON(worker_thread_);
enabled_w_ = enable;
for (auto& sink_pair : sink_pairs()) {
VideoSinkWants modified_wants = sink_pair.wants;
modified_wants.black_frames = !enable;
video_source_->AddOrUpdateSink(sink_pair.sink, modified_wants);
}
});
return ret;
}
bool VideoTrack::enabled() const {
if (worker_thread_->IsCurrent()) {
RTC_DCHECK_RUN_ON(worker_thread_);
return enabled_w_;
}
RTC_DCHECK_RUN_ON(&signaling_thread_);
return MediaStreamTrack<VideoTrackInterface>::enabled();
}
MediaStreamTrackInterface::TrackState VideoTrack::state() const {
RTC_DCHECK_RUN_ON(worker_thread_);
return MediaStreamTrack<VideoTrackInterface>::state();
}
void VideoTrack::OnChanged() {
RTC_DCHECK_RUN_ON(&signaling_thread_);
Thread::ScopedDisallowBlockingCalls no_blocking_calls;
MediaSourceInterface::SourceState state = video_source_->state();
set_state(state == MediaSourceInterface::kEnded ? kEnded : kLive);
}
scoped_refptr<VideoTrack> VideoTrack::Create(
absl::string_view id,
scoped_refptr<VideoTrackSourceInterface> source,
Thread* worker_thread) {
scoped_refptr<VideoTrackSourceProxyWithInternal<VideoTrackSourceInterface>>
source_proxy = VideoTrackSourceProxy::Create(
Thread::Current(), worker_thread, std::move(source));
return make_ref_counted<VideoTrack>(id, std::move(source_proxy),
worker_thread);
}
} // namespace webrtc
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