blob: 84b261c9b84cb5fbf7748a9539ee4092bb2773e8 [file] [log] [blame]
// Copyright 2018 Google Inc. 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 "base/compiler_specific.h"
namespace cobalt {
namespace media_stream {
MediaStreamAudioSource::~MediaStreamAudioSource() {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(stop_callback_.is_null());
}
bool MediaStreamAudioSource::ConnectToTrack(MediaStreamAudioTrack* track) {
DCHECK(thread_checker_.CalledOnValidThread());
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;
}
void MediaStreamAudioSource::DeliverDataToTracks(
const MediaStreamAudioTrack::ShellAudioBus& audio_bus,
base::TimeTicks reference_time) {
deliverer_.OnData(audio_bus, reference_time);
}
MediaStreamAudioSource::MediaStreamAudioSource()
: ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
weak_this_(weak_ptr_factory_.GetWeakPtr()) {}
void MediaStreamAudioSource::DoStopSource() {
DCHECK(thread_checker_.CalledOnValidThread());
EnsureSourceIsStopped();
is_stopped_ = true;
}
void MediaStreamAudioSource::StopAudioDeliveryTo(MediaStreamAudioTrack* track) {
DCHECK(thread_checker_.CalledOnValidThread());
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