1 /*
2 * Copyright 2011 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "pc/video_track.h"
12
13 #include <string>
14 #include <vector>
15
16 #include "api/notifier.h"
17 #include "api/sequence_checker.h"
18 #include "rtc_base/checks.h"
19 #include "rtc_base/location.h"
20 #include "rtc_base/ref_counted_object.h"
21
22 namespace webrtc {
23
VideoTrack(const std::string & label,VideoTrackSourceInterface * video_source,rtc::Thread * worker_thread)24 VideoTrack::VideoTrack(const std::string& label,
25 VideoTrackSourceInterface* video_source,
26 rtc::Thread* worker_thread)
27 : MediaStreamTrack<VideoTrackInterface>(label),
28 worker_thread_(worker_thread),
29 video_source_(video_source),
30 content_hint_(ContentHint::kNone) {
31 video_source_->RegisterObserver(this);
32 }
33
~VideoTrack()34 VideoTrack::~VideoTrack() {
35 video_source_->UnregisterObserver(this);
36 }
37
kind() const38 std::string VideoTrack::kind() const {
39 return kVideoKind;
40 }
41
42 // AddOrUpdateSink and RemoveSink should be called on the worker
43 // thread.
AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame> * sink,const rtc::VideoSinkWants & wants)44 void VideoTrack::AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
45 const rtc::VideoSinkWants& wants) {
46 RTC_DCHECK(worker_thread_->IsCurrent());
47 VideoSourceBase::AddOrUpdateSink(sink, wants);
48 rtc::VideoSinkWants modified_wants = wants;
49 modified_wants.black_frames = !enabled();
50 video_source_->AddOrUpdateSink(sink, modified_wants);
51 }
52
RemoveSink(rtc::VideoSinkInterface<VideoFrame> * sink)53 void VideoTrack::RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) {
54 RTC_DCHECK(worker_thread_->IsCurrent());
55 VideoSourceBase::RemoveSink(sink);
56 video_source_->RemoveSink(sink);
57 }
58
content_hint() const59 VideoTrackInterface::ContentHint VideoTrack::content_hint() const {
60 RTC_DCHECK_RUN_ON(&signaling_thread_checker_);
61 return content_hint_;
62 }
63
set_content_hint(ContentHint hint)64 void VideoTrack::set_content_hint(ContentHint hint) {
65 RTC_DCHECK_RUN_ON(&signaling_thread_checker_);
66 if (content_hint_ == hint)
67 return;
68 content_hint_ = hint;
69 Notifier<VideoTrackInterface>::FireOnChanged();
70 }
71
set_enabled(bool enable)72 bool VideoTrack::set_enabled(bool enable) {
73 RTC_DCHECK(signaling_thread_checker_.IsCurrent());
74 worker_thread_->Invoke<void>(RTC_FROM_HERE, [enable, this] {
75 RTC_DCHECK(worker_thread_->IsCurrent());
76 for (auto& sink_pair : sink_pairs()) {
77 rtc::VideoSinkWants modified_wants = sink_pair.wants;
78 modified_wants.black_frames = !enable;
79 video_source_->AddOrUpdateSink(sink_pair.sink, modified_wants);
80 }
81 });
82 return MediaStreamTrack<VideoTrackInterface>::set_enabled(enable);
83 }
84
OnChanged()85 void VideoTrack::OnChanged() {
86 RTC_DCHECK(signaling_thread_checker_.IsCurrent());
87 if (video_source_->state() == MediaSourceInterface::kEnded) {
88 set_state(kEnded);
89 } else {
90 set_state(kLive);
91 }
92 }
93
Create(const std::string & id,VideoTrackSourceInterface * source,rtc::Thread * worker_thread)94 rtc::scoped_refptr<VideoTrack> VideoTrack::Create(
95 const std::string& id,
96 VideoTrackSourceInterface* source,
97 rtc::Thread* worker_thread) {
98 rtc::RefCountedObject<VideoTrack>* track =
99 new rtc::RefCountedObject<VideoTrack>(id, source, worker_thread);
100 return track;
101 }
102
103 } // namespace webrtc
104