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/*
* libjingle
* Copyright 2015 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/app/webrtc/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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