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 "rtc_base/checks.h"
18 #include "rtc_base/location.h"
19 #include "rtc_base/ref_counted_object.h"
20
21 namespace webrtc {
22
VideoTrack(const std::string & label,VideoTrackSourceInterface * video_source,rtc::Thread * worker_thread)23 VideoTrack::VideoTrack(const std::string& label,
24 VideoTrackSourceInterface* video_source,
25 rtc::Thread* worker_thread)
26 : MediaStreamTrack<VideoTrackInterface>(label),
27 worker_thread_(worker_thread),
28 video_source_(video_source),
29 content_hint_(ContentHint::kNone) {
30 video_source_->RegisterObserver(this);
31 }
32
~VideoTrack()33 VideoTrack::~VideoTrack() {
34 video_source_->UnregisterObserver(this);
35 }
36
kind() const37 std::string VideoTrack::kind() const {
38 return kVideoKind;
39 }
40
41 // AddOrUpdateSink and RemoveSink should be called on the worker
42 // thread.
AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame> * sink,const rtc::VideoSinkWants & wants)43 void VideoTrack::AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
44 const rtc::VideoSinkWants& wants) {
45 RTC_DCHECK(worker_thread_->IsCurrent());
46 VideoSourceBase::AddOrUpdateSink(sink, wants);
47 rtc::VideoSinkWants modified_wants = wants;
48 modified_wants.black_frames = !enabled();
49 video_source_->AddOrUpdateSink(sink, modified_wants);
50 }
51
RemoveSink(rtc::VideoSinkInterface<VideoFrame> * sink)52 void VideoTrack::RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) {
53 RTC_DCHECK(worker_thread_->IsCurrent());
54 VideoSourceBase::RemoveSink(sink);
55 video_source_->RemoveSink(sink);
56 }
57
content_hint() const58 VideoTrackInterface::ContentHint VideoTrack::content_hint() const {
59 RTC_DCHECK_RUN_ON(&signaling_thread_checker_);
60 return content_hint_;
61 }
62
set_content_hint(ContentHint hint)63 void VideoTrack::set_content_hint(ContentHint hint) {
64 RTC_DCHECK_RUN_ON(&signaling_thread_checker_);
65 if (content_hint_ == hint)
66 return;
67 content_hint_ = hint;
68 Notifier<VideoTrackInterface>::FireOnChanged();
69 }
70
set_enabled(bool enable)71 bool VideoTrack::set_enabled(bool enable) {
72 RTC_DCHECK(signaling_thread_checker_.IsCurrent());
73 worker_thread_->Invoke<void>(RTC_FROM_HERE, [enable, this] {
74 RTC_DCHECK(worker_thread_->IsCurrent());
75 for (auto& sink_pair : sink_pairs()) {
76 rtc::VideoSinkWants modified_wants = sink_pair.wants;
77 modified_wants.black_frames = !enable;
78 video_source_->AddOrUpdateSink(sink_pair.sink, modified_wants);
79 }
80 });
81 return MediaStreamTrack<VideoTrackInterface>::set_enabled(enable);
82 }
83
OnChanged()84 void VideoTrack::OnChanged() {
85 RTC_DCHECK(signaling_thread_checker_.IsCurrent());
86 if (video_source_->state() == MediaSourceInterface::kEnded) {
87 set_state(kEnded);
88 } else {
89 set_state(kLive);
90 }
91 }
92
Create(const std::string & id,VideoTrackSourceInterface * source,rtc::Thread * worker_thread)93 rtc::scoped_refptr<VideoTrack> VideoTrack::Create(
94 const std::string& id,
95 VideoTrackSourceInterface* source,
96 rtc::Thread* worker_thread) {
97 rtc::RefCountedObject<VideoTrack>* track =
98 new rtc::RefCountedObject<VideoTrack>(id, source, worker_thread);
99 return track;
100 }
101
102 } // namespace webrtc
103