chromium/services/audio/output_device_mixer_manager.h

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SERVICES_AUDIO_OUTPUT_DEVICE_MIXER_MANAGER_H_
#define SERVICES_AUDIO_OUTPUT_DEVICE_MIXER_MANAGER_H_

#include <memory>
#include <set>
#include <string>

#include "base/containers/flat_map.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "media/base/audio_parameters.h"
#include "services/audio/device_output_listener.h"
#include "services/audio/output_device_mixer.h"
#include "services/audio/reference_output.h"

namespace media {
class AudioManager;
class AudioOutputStream;
}  // namespace media

namespace audio {

// Creates OutputDeviceMixers as needed, when playback is requested through
// MakeOutputStream(). OutputDeviceMixers are destroyed on device change, or
// when the Audio service shuts down, but are not cleaned up otherwise.
// Listening to a device has no effect, until that device's OutputDeviceMixer is
// created and playback has started.
class OutputDeviceMixerManager : public DeviceOutputListener { … };

}  // namespace audio

#endif  // SERVICES_AUDIO_OUTPUT_DEVICE_MIXER_MANAGER_H_