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// Copyright 2018 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/media_stream/media_stream_audio_source.h"
#include <vector>
#include "base/compiler_specific.h"
namespace cobalt {
namespace media_stream {
MediaStreamAudioSource::~MediaStreamAudioSource() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(stop_callback_.is_null());
}
bool MediaStreamAudioSource::ConnectToTrack(MediaStreamAudioTrack* track) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(track);
// Try to start the source, if has not been permanently stopped.
// If we are unable to start the source, the MediaSteamTrack will stay in
// the stopped/ended state.
if (!is_stopped_) {
if (!EnsureSourceIsStarted()) {
StopSource();
}
}
if (is_stopped_) {
return false;
}
// It is safe to pass an unretained pointer, since the callback here
// will be called in |MediaStreamAudioTrack::Stop|.
track->Start(base::Bind(&MediaStreamAudioSource::StopAudioDeliveryTo,
weak_this_, base::Unretained(track)));
deliverer_.AddConsumer(track);
return true;
}
MediaTrackSettings MediaStreamAudioSource::GetMediaTrackSettings() const {
// The following call is thread safe.
AudioParameters parameters = deliverer_.GetAudioParameters();
return MediaStreamAudioTrack::MediaTrackSettingsFromAudioParameters(
parameters);
}
void MediaStreamAudioSource::DeliverDataToTracks(
const MediaStreamAudioTrack::AudioBus& audio_bus,
base::TimeTicks reference_time) {
deliverer_.OnData(audio_bus, reference_time);
}
void MediaStreamAudioSource::NotifyTracksOfNewReadyState(
MediaStreamAudioTrack::ReadyState new_ready_state) {
std::vector<MediaStreamAudioTrack*> tracks_to_notify;
deliverer_.GetConsumerList(&tracks_to_notify);
for (MediaStreamAudioTrack* track : tracks_to_notify) {
track->OnReadyStateChanged(new_ready_state);
}
}
MediaStreamAudioSource::MediaStreamAudioSource()
: ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
weak_this_(weak_ptr_factory_.GetWeakPtr()) {}
void MediaStreamAudioSource::DoStopSource() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
is_stopped_ = true;
// This function might result in the destruction of this object, so be
// careful not to reference members after this call.
EnsureSourceIsStopped();
}
void MediaStreamAudioSource::StopAudioDeliveryTo(MediaStreamAudioTrack* track) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
bool did_remove_last_track = deliverer_.RemoveConsumer(track);
// Per spec at: https://www.w3.org/TR/mediacapture-streams/#mediastreamtrack
// "When all tracks using a source have been stopped or ended by some other
// means, the source is stopped."
if (!is_stopped_ && did_remove_last_track) {
StopSource();
}
}
} // namespace media_stream
} // namespace cobalt