84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
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/*
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* Copyright 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "pc/media_stream_observer.h"
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#include <string>
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#include <vector>
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#include "absl/algorithm/container.h"
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namespace webrtc {
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MediaStreamObserver::MediaStreamObserver(MediaStreamInterface* stream)
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: stream_(stream),
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cached_audio_tracks_(stream->GetAudioTracks()),
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cached_video_tracks_(stream->GetVideoTracks()) {
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stream_->RegisterObserver(this);
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}
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MediaStreamObserver::~MediaStreamObserver() {
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stream_->UnregisterObserver(this);
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}
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void MediaStreamObserver::OnChanged() {
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AudioTrackVector new_audio_tracks = stream_->GetAudioTracks();
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VideoTrackVector new_video_tracks = stream_->GetVideoTracks();
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// Find removed audio tracks.
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for (const auto& cached_track : cached_audio_tracks_) {
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if (absl::c_none_of(
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new_audio_tracks,
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[cached_track](const AudioTrackVector::value_type& new_track) {
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return new_track->id() == cached_track->id();
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})) {
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SignalAudioTrackRemoved(cached_track.get(), stream_);
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}
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}
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// Find added audio tracks.
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for (const auto& new_track : new_audio_tracks) {
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if (absl::c_none_of(
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cached_audio_tracks_,
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[new_track](const AudioTrackVector::value_type& cached_track) {
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return new_track->id() == cached_track->id();
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})) {
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SignalAudioTrackAdded(new_track.get(), stream_);
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}
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}
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// Find removed video tracks.
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for (const auto& cached_track : cached_video_tracks_) {
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if (absl::c_none_of(
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new_video_tracks,
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[cached_track](const VideoTrackVector::value_type& new_track) {
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return new_track->id() == cached_track->id();
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})) {
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SignalVideoTrackRemoved(cached_track.get(), stream_);
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}
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}
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// Find added video tracks.
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for (const auto& new_track : new_video_tracks) {
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if (absl::c_none_of(
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cached_video_tracks_,
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[new_track](const VideoTrackVector::value_type& cached_track) {
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return new_track->id() == cached_track->id();
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})) {
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SignalVideoTrackAdded(new_track.get(), stream_);
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}
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}
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cached_audio_tracks_ = new_audio_tracks;
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cached_video_tracks_ = new_video_tracks;
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}
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} // namespace webrtc
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