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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_AUDIO_AUDIO_SYSTEM_H_
#define MEDIA_AUDIO_AUDIO_SYSTEM_H_
#include "base/callback.h"
#include "media/base/audio_parameters.h"
#include "media/base/media_export.h"
namespace media {
class AudioManager;
// Work in progress: Provides asynchronous interface to AudioManager. All the
// AudioManager clients will be switched to it, in preparation for moving
// to Mojo audio service.
class MEDIA_EXPORT AudioSystem {
public:
// Replies are asynchronously sent to the thread the call is issued on.
using OnAudioParamsCallback = base::Callback<void(const AudioParameters&)>;
using OnBoolCallback = base::Callback<void(bool)>;
static AudioSystem* Get();
virtual ~AudioSystem();
// Callback will receive invalid parameters if the device is not found.
virtual void GetInputStreamParameters(
const std::string& device_id,
OnAudioParamsCallback on_params_cb) const = 0;
virtual void HasInputDevices(OnBoolCallback on_has_devices_cb) const = 0;
// Must not be used for anything but stream creation.
virtual AudioManager* GetAudioManager() const = 0;
protected:
// Sets the global AudioSystem pointer to the specified non-null value.
static void SetInstance(AudioSystem* audio_system);
// Sets the global AudioSystem pointer to null if it equals the specified one.
static void ClearInstance(const AudioSystem* audio_system);
};
} // namespace media
#endif // MEDIA_AUDIO_AUDIO_SYSTEM_H_
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