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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
#pragma once
#include <mutex>
#include <set>
#include <api/media_stream_interface.h>
#include "host/frontend/webrtc/libdevice/audio_sink.h"
namespace cuttlefish {
namespace webrtc_streaming {
class AudioTrackSourceImpl : public webrtc::AudioSourceInterface {
public:
AudioTrackSourceImpl() = default;
// Sets the volume of the source. |volume| is in the range of [0, 10].
void SetVolume(double volume) override;
void RegisterAudioObserver(AudioObserver* observer) override;
void UnregisterAudioObserver(AudioObserver* observer) override;
void AddSink(webrtc::AudioTrackSinkInterface* sink) override;
void RemoveSink(webrtc::AudioTrackSinkInterface* sink) override;
// Returns options for the AudioSource.
// (for some of the settings this approach is broken, e.g. setting
// audio network adaptation on the source is the wrong layer of abstraction).
virtual const cricket::AudioOptions options() const;
void OnFrame(std::shared_ptr<AudioFrameBuffer> frame, int64_t timestamp_ms);
// MediaSourceInterface implementation
SourceState state() const override;
bool remote() const override;
// NotifierInterface implementation
void RegisterObserver(webrtc::ObserverInterface* observer) override;
void UnregisterObserver(webrtc::ObserverInterface* observer) override;
private:
std::set<AudioObserver*> audio_observers_;
std::mutex observers_mutex_;
std::set<webrtc::AudioTrackSinkInterface*> sinks_;
std::mutex sinks_mutex_;
};
// Wraps an AudioTrackSourceImpl as an implementation of the AudioSink
// interface. This is needed as the AudioTrackSourceImpl is a reference counted
// object that should only be referenced by rtc::scoped_refptr pointers, but the
// AudioSink interface is not a reference counted object and therefore not
// compatible with that kind of pointers. This class can be referenced by a
// shared pointer and it in turn holds a scoped_refptr to the wrapped object.
class AudioTrackSourceImplSinkWrapper : public AudioSink {
public:
virtual ~AudioTrackSourceImplSinkWrapper() = default;
AudioTrackSourceImplSinkWrapper(rtc::scoped_refptr<AudioTrackSourceImpl> obj)
: track_source_impl_(obj) {}
void OnFrame(std::shared_ptr<AudioFrameBuffer> frame,
int64_t timestamp_ms) override {
track_source_impl_->OnFrame(frame, timestamp_ms);
}
private:
rtc::scoped_refptr<AudioTrackSourceImpl> track_source_impl_;
};
} // namespace webrtc_streaming
} // namespace cuttlefish
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