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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.
#ifndef COBALT_MEDIA_STREAM_MEDIA_STREAM_AUDIO_TRACK_H_
#define COBALT_MEDIA_STREAM_MEDIA_STREAM_AUDIO_TRACK_H_
#include "base/callback.h"
#include "base/strings/string_piece.h"
#include "base/threading/thread_checker.h"
#include "cobalt/dom/event_target.h"
#include "cobalt/media/base/audio_bus.h"
#include "cobalt/media_stream/audio_parameters.h"
#include "cobalt/media_stream/media_stream_audio_deliverer.h"
#include "cobalt/media_stream/media_stream_audio_sink.h"
#include "cobalt/media_stream/media_stream_track.h"
#include "cobalt/media_stream/media_track_settings.h"
#include "cobalt/script/environment_settings.h"
namespace cobalt {
namespace media_capture {
class MediaRecorderTest;
}
namespace media_stream {
class MediaStreamAudioSource;
// This class represents a MediaStreamTrack, and implements the specification
// at: https://www.w3.org/TR/mediacapture-streams/#dom-mediastreamtrack
class MediaStreamAudioTrack : public MediaStreamTrack {
public:
static MediaTrackSettings MediaTrackSettingsFromAudioParameters(
const AudioParameters& parameters) {
MediaTrackSettings settings;
settings.set_channel_count(parameters.channel_count());
settings.set_sample_rate(parameters.sample_rate());
settings.set_sample_size(parameters.bits_per_sample());
return settings;
}
typedef media::AudioBus AudioBus;
explicit MediaStreamAudioTrack(script::EnvironmentSettings* settings)
: MediaStreamTrack(settings) {}
~MediaStreamAudioTrack() override { Stop(); }
void AddSink(MediaStreamAudioSink* sink);
void RemoveSink(MediaStreamAudioSink* sink);
void Stop() override;
void OnReadyStateChanged(
media_stream::MediaStreamTrack::ReadyState new_state) override;
private:
FRIEND_TEST_ALL_PREFIXES(MediaStreamAudioTrackTest, OnSetFormatAndData);
FRIEND_TEST_ALL_PREFIXES(MediaStreamAudioTrackTest, OneTrackMultipleSinks);
FRIEND_TEST_ALL_PREFIXES(MediaStreamAudioTrackTest, TwoTracksWithOneSinkEach);
FRIEND_TEST_ALL_PREFIXES(MediaStreamAudioTrackTest, AddRemoveSink);
FRIEND_TEST_ALL_PREFIXES(MediaStreamAudioTrackTest, Stop);
FRIEND_TEST_ALL_PREFIXES(MediaStreamAudioTrackTest,
ReadyStateEndedNotifyIfAlreadyStopped);
friend class media_capture::MediaRecorderTest;
friend class MediaStreamAudioSource;
friend class MediaStreamAudioDeliverer<MediaStreamAudioTrack>;
// Called by MediaStreamAudioSource.
void Start(const base::Closure& stop_callback);
// Called by MediaStreamAudioDeliverer.
void OnData(const AudioBus& audio_bus, base::TimeTicks reference_time);
void OnSetFormat(const media_stream::AudioParameters& params);
THREAD_CHECKER(thread_checker_);
MediaStreamAudioDeliverer<MediaStreamAudioSink> deliverer_;
MediaStreamAudioTrack(const MediaStreamAudioTrack&) = delete;
MediaStreamAudioTrack& operator=(const MediaStreamAudioTrack&) = delete;
base::Closure stop_callback_;
};
} // namespace media_stream
} // namespace cobalt
#endif // COBALT_MEDIA_STREAM_MEDIA_STREAM_AUDIO_TRACK_H_