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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_AUDIO_AUDIO_SYSTEM_H_ | 5 #ifndef MEDIA_AUDIO_AUDIO_SYSTEM_H_ |
6 #define MEDIA_AUDIO_AUDIO_SYSTEM_H_ | 6 #define MEDIA_AUDIO_AUDIO_SYSTEM_H_ |
7 | 7 |
8 #include "base/callback.h" | 8 #include "base/callback.h" |
9 #include "media/base/audio_parameters.h" | 9 #include "media/base/audio_parameters.h" |
10 #include "media/base/media_export.h" | 10 #include "media/base/media_export.h" |
11 | 11 |
12 namespace media { | 12 namespace media { |
13 class AudioManager; | 13 class AudioManager; |
14 | 14 |
15 // Work in progress: Provides asynchronous interface to AudioManager. All the | 15 // Work in progress: Provides asynchronous interface to AudioManager. All the |
16 // AudioManager clients will be switched to it, in preparation for moving | 16 // AudioManager clients will be switched to it, in preparation for moving |
17 // to Mojo audio service. | 17 // to Mojo audio service. |
18 class MEDIA_EXPORT AudioSystem { | 18 class MEDIA_EXPORT AudioSystem { |
19 public: | 19 public: |
20 // Replies are asynchronously sent to the thread the call is issued on. | 20 // Replies are asynchronously sent to the thread the call is issued on. |
21 using OnAudioParamsCallback = base::Callback<void(const AudioParameters&)>; | 21 using OnAudioParamsCallback = base::Callback<void(const AudioParameters&)>; |
22 using OnBoolCallback = base::Callback<void(bool)>; | 22 using OnBoolCallback = base::Callback<void(bool)>; |
23 | 23 |
24 static AudioSystem* Get(); | 24 static AudioSystem* Get(); |
25 | 25 |
26 virtual ~AudioSystem(); | 26 virtual ~AudioSystem(); |
27 | 27 |
28 // Callback may receive invalid parameters, it means the specified device is | 28 // Callback will receive invalid parameters if the device is not found. |
29 // not found. This is best-effort: valid parameters do not guarantee existance | |
30 // of the device. | |
31 // TODO(olka,tommi): fix all AudioManager implementations to return invalid | |
32 // parameters if the device is not found. | |
33 virtual void GetInputStreamParameters( | 29 virtual void GetInputStreamParameters( |
34 const std::string& device_id, | 30 const std::string& device_id, |
35 OnAudioParamsCallback on_params_cb) const = 0; | 31 OnAudioParamsCallback on_params_cb) const = 0; |
36 | 32 |
37 // If media::AudioDeviceDescription::IsDefaultDevice(device_id) is true, | |
38 // callback will receive the parameters of the default output device. | |
39 // Callback may receive invalid parameters, it means the specified device is | |
40 // not found. This is best-effort: valid parameters do not guarantee existance | |
41 // of the device. | |
42 // TODO(olka,tommi): fix all AudioManager implementations to return invalid | |
43 // parameters if the device is not found. | |
44 virtual void GetOutputStreamParameters( | |
45 const std::string& device_id, | |
46 OnAudioParamsCallback on_params_cb) const = 0; | |
47 | |
48 virtual void HasInputDevices(OnBoolCallback on_has_devices_cb) const = 0; | 33 virtual void HasInputDevices(OnBoolCallback on_has_devices_cb) const = 0; |
49 | 34 |
50 // Must not be used for anything but stream creation. | 35 // Must not be used for anything but stream creation. |
51 virtual AudioManager* GetAudioManager() const = 0; | 36 virtual AudioManager* GetAudioManager() const = 0; |
52 | 37 |
53 protected: | 38 protected: |
54 // Sets the global AudioSystem pointer to the specified non-null value. | 39 // Sets the global AudioSystem pointer to the specified non-null value. |
55 static void SetInstance(AudioSystem* audio_system); | 40 static void SetInstance(AudioSystem* audio_system); |
56 | 41 |
57 // Sets the global AudioSystem pointer to null if it equals the specified one. | 42 // Sets the global AudioSystem pointer to null if it equals the specified one. |
58 static void ClearInstance(const AudioSystem* audio_system); | 43 static void ClearInstance(const AudioSystem* audio_system); |
59 }; | 44 }; |
60 | 45 |
61 } // namespace media | 46 } // namespace media |
62 | 47 |
63 #endif // MEDIA_AUDIO_AUDIO_SYSTEM_H_ | 48 #endif // MEDIA_AUDIO_AUDIO_SYSTEM_H_ |
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