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/*
* Copyright 2015 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/mediastreamobserver.h"
#include <algorithm>
namespace webrtc {
MediaStreamObserver::MediaStreamObserver(MediaStreamInterface* stream)
: stream_(stream),
cached_audio_tracks_(stream->GetAudioTracks()),
cached_video_tracks_(stream->GetVideoTracks()) {
stream_->RegisterObserver(this);
}
MediaStreamObserver::~MediaStreamObserver() {
stream_->UnregisterObserver(this);
}
void MediaStreamObserver::OnChanged() {
AudioTrackVector new_audio_tracks = stream_->GetAudioTracks();
VideoTrackVector new_video_tracks = stream_->GetVideoTracks();
// Find removed audio tracks.
for (const auto& cached_track : cached_audio_tracks_) {
auto it = std::find_if(
new_audio_tracks.begin(), new_audio_tracks.end(),
[cached_track](const AudioTrackVector::value_type& new_track) {
return new_track->id().compare(cached_track->id()) == 0;
});
if (it == new_audio_tracks.end()) {
SignalAudioTrackRemoved(cached_track.get(), stream_);
}
}
// Find added audio tracks.
for (const auto& new_track : new_audio_tracks) {
auto it = std::find_if(
cached_audio_tracks_.begin(), cached_audio_tracks_.end(),
[new_track](const AudioTrackVector::value_type& cached_track) {
return new_track->id().compare(cached_track->id()) == 0;
});
if (it == cached_audio_tracks_.end()) {
SignalAudioTrackAdded(new_track.get(), stream_);
}
}
// Find removed video tracks.
for (const auto& cached_track : cached_video_tracks_) {
auto it = std::find_if(
new_video_tracks.begin(), new_video_tracks.end(),
[cached_track](const VideoTrackVector::value_type& new_track) {
return new_track->id().compare(cached_track->id()) == 0;
});
if (it == new_video_tracks.end()) {
SignalVideoTrackRemoved(cached_track.get(), stream_);
}
}
// Find added video tracks.
for (const auto& new_track : new_video_tracks) {
auto it = std::find_if(
cached_video_tracks_.begin(), cached_video_tracks_.end(),
[new_track](const VideoTrackVector::value_type& cached_track) {
return new_track->id().compare(cached_track->id()) == 0;
});
if (it == cached_video_tracks_.end()) {
SignalVideoTrackAdded(new_track.get(), stream_);
}
}
cached_audio_tracks_ = new_audio_tracks;
cached_video_tracks_ = new_video_tracks;
}
} // namespace webrtc
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