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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/media_stream_observer.h"
#include <functional>
#include <string>
#include <utility>
#include <vector>
#include "absl/algorithm/container.h"
namespace webrtc {
MediaStreamObserver::MediaStreamObserver(
MediaStreamInterface* stream,
std::function<void(AudioTrackInterface*, MediaStreamInterface*)>
audio_track_added_callback,
std::function<void(AudioTrackInterface*, MediaStreamInterface*)>
audio_track_removed_callback,
std::function<void(VideoTrackInterface*, MediaStreamInterface*)>
video_track_added_callback,
std::function<void(VideoTrackInterface*, MediaStreamInterface*)>
video_track_removed_callback)
: stream_(stream),
cached_audio_tracks_(stream->GetAudioTracks()),
cached_video_tracks_(stream->GetVideoTracks()),
audio_track_added_callback_(std::move(audio_track_added_callback)),
audio_track_removed_callback_(std::move(audio_track_removed_callback)),
video_track_added_callback_(std::move(video_track_added_callback)),
video_track_removed_callback_(std::move(video_track_removed_callback)) {
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_) {
if (absl::c_none_of(
new_audio_tracks,
[cached_track](const AudioTrackVector::value_type& new_track) {
return new_track->id() == cached_track->id();
})) {
audio_track_removed_callback_(cached_track.get(), stream_.get());
}
}
// Find added audio tracks.
for (const auto& new_track : new_audio_tracks) {
if (absl::c_none_of(
cached_audio_tracks_,
[new_track](const AudioTrackVector::value_type& cached_track) {
return new_track->id() == cached_track->id();
})) {
audio_track_added_callback_(new_track.get(), stream_.get());
}
}
// Find removed video tracks.
for (const auto& cached_track : cached_video_tracks_) {
if (absl::c_none_of(
new_video_tracks,
[cached_track](const VideoTrackVector::value_type& new_track) {
return new_track->id() == cached_track->id();
})) {
video_track_removed_callback_(cached_track.get(), stream_.get());
}
}
// Find added video tracks.
for (const auto& new_track : new_video_tracks) {
if (absl::c_none_of(
cached_video_tracks_,
[new_track](const VideoTrackVector::value_type& cached_track) {
return new_track->id() == cached_track->id();
})) {
video_track_added_callback_(new_track.get(), stream_.get());
}
}
cached_audio_tracks_ = new_audio_tracks;
cached_video_tracks_ = new_video_tracks;
}
} // namespace webrtc