| // 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_ |