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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/audio/audio_device_description.h" | 9 #include "media/audio/audio_device_description.h" |
10 #include "media/base/audio_parameters.h" | 10 #include "media/base/audio_parameters.h" |
11 #include "media/base/media_export.h" | 11 #include "media/base/media_export.h" |
12 | 12 |
13 namespace base { | 13 namespace base { |
14 class SingleThreadTaskRunner; | 14 class SingleThreadTaskRunner; |
15 } | 15 } |
16 | 16 |
17 namespace media { | 17 namespace media { |
18 class AudioManager; | 18 class AudioManager; |
19 | 19 |
20 // Work in progress: Provides asynchronous interface to AudioManager. All the | 20 // Work in progress: Provides asynchronous interface to AudioManager. All the |
21 // AudioManager clients will be switched to it, in preparation for moving | 21 // AudioManager clients will be switched to it, in preparation for moving |
22 // to Mojo audio service. | 22 // to Mojo audio service. |
23 class MEDIA_EXPORT AudioSystem { | 23 class MEDIA_EXPORT AudioSystem { |
24 public: | 24 public: |
25 // Replies are asynchronously sent from audio system thread to the thread the | 25 // Replies are asynchronously sent from audio system thread to the thread the |
26 // call is issued on. Attention! Since audio system thread may outlive all the | 26 // call is issued on. Attention! Audio system thread may outlive the client |
27 // others, callbacks must always be bound to weak pointers! | 27 // objects; bind callbacks with care. |
28 using OnAudioParamsCallback = base::Callback<void(const AudioParameters&)>; | 28 using OnAudioParamsCallback = base::Callback<void(const AudioParameters&)>; |
29 using OnBoolCallback = base::Callback<void(bool)>; | 29 using OnBoolCallback = base::Callback<void(bool)>; |
30 using OnDeviceDescriptionsCallback = | 30 using OnDeviceDescriptionsCallback = |
31 base::Callback<void(AudioDeviceDescriptions)>; | 31 base::Callback<void(AudioDeviceDescriptions)>; |
32 using OnDeviceIdCallback = base::Callback<void(const std::string&)>; | |
33 using OnInputDeviceInfoCallback = base::Callback< | |
34 void(const AudioParameters&, const AudioParameters&, const std::string&)>; | |
32 | 35 |
36 // Must not be called on audio system thread if it differs from the one | |
DaleCurtis
2017/04/06 18:37:17
I'd prefer not to land this without resolving this
o1ka
2017/04/07 12:22:17
It's just a comment describing the current situati
| |
37 // AudioSystem is destroyed on. | |
33 static AudioSystem* Get(); | 38 static AudioSystem* Get(); |
34 | 39 |
35 virtual ~AudioSystem(); | 40 virtual ~AudioSystem(); |
36 | 41 |
37 // Callback may receive invalid parameters, it means the specified device is | 42 // Callback may receive invalid parameters, it means the specified device is |
38 // not found. This is best-effort: valid parameters do not guarantee existance | 43 // not found. This is best-effort: valid parameters do not guarantee existance |
39 // of the device. | 44 // of the device. |
40 // TODO(olka,tommi): fix all AudioManager implementations to return invalid | 45 // TODO(olka,tommi): fix all AudioManager implementations to return invalid |
41 // parameters if the device is not found. | 46 // parameters if the device is not found. |
42 virtual void GetInputStreamParameters( | 47 virtual void GetInputStreamParameters( |
43 const std::string& device_id, | 48 const std::string& device_id, |
44 OnAudioParamsCallback on_params_cb) const = 0; | 49 OnAudioParamsCallback on_params_cb) const = 0; |
45 | 50 |
46 // If media::AudioDeviceDescription::IsDefaultDevice(device_id) is true, | 51 // If media::AudioDeviceDescription::IsDefaultDevice(device_id) is true, |
47 // callback will receive the parameters of the default output device. | 52 // callback will receive the parameters of the default output device. |
48 // Callback may receive invalid parameters, it means the specified device is | 53 // Callback may receive invalid parameters, it means the specified device is |
49 // not found. This is best-effort: valid parameters do not guarantee existance | 54 // not found. This is best-effort: valid parameters do not guarantee existance |
50 // of the device. | 55 // of the device. |
51 // TODO(olka,tommi): fix all AudioManager implementations to return invalid | 56 // TODO(olka,tommi): fix all AudioManager implementations to return invalid |
52 // parameters if the device is not found. | 57 // parameters if the device is not found. |
53 virtual void GetOutputStreamParameters( | 58 virtual void GetOutputStreamParameters( |
54 const std::string& device_id, | 59 const std::string& device_id, |
55 OnAudioParamsCallback on_params_cb) const = 0; | 60 OnAudioParamsCallback on_params_cb) const = 0; |
56 | 61 |
57 virtual void HasInputDevices(OnBoolCallback on_has_devices_cb) const = 0; | 62 virtual void HasInputDevices(OnBoolCallback on_has_devices_cb) const = 0; |
58 | 63 |
59 // Replies with device descriptions of input audio devices if |for_input| is | 64 // Replies with device descriptions of input audio devices if |for_input| is |
60 // true, and of output audio devices otherwise. | 65 // true, and of output audio devices otherwise. |
61 virtual void GetDeviceDescriptions( | 66 virtual void GetDeviceDescriptions( |
62 OnDeviceDescriptionsCallback on_descriptions_cp, | 67 OnDeviceDescriptionsCallback on_descriptions_cb, |
63 bool for_input) = 0; | 68 bool for_input) = 0; |
64 | 69 |
70 // Replies with an empty string if there is no associated output device found. | |
71 virtual void GetAssociatedOutputDeviceID( | |
72 const std::string& input_device_id, | |
73 OnDeviceIdCallback on_device_id_cb) = 0; | |
74 | |
75 // Replies with audio parameters for the specified input device and audio | |
76 // parameters and device ID of the associated output device, if any (otherwise | |
77 // it's AudioParameters() and an empty string). | |
78 virtual void GetInputDeviceInfo( | |
79 const std::string& input_device_id, | |
80 OnInputDeviceInfoCallback on_input_device_info_cb) = 0; | |
81 | |
65 virtual base::SingleThreadTaskRunner* GetTaskRunner() const = 0; | 82 virtual base::SingleThreadTaskRunner* GetTaskRunner() const = 0; |
66 | 83 |
67 // Must not be used for anything but stream creation. | |
68 virtual AudioManager* GetAudioManager() const = 0; | |
69 | |
70 protected: | 84 protected: |
71 // Sets the global AudioSystem pointer to the specified non-null value. | 85 // Sets the global AudioSystem pointer to the specified non-null value. |
72 static void SetInstance(AudioSystem* audio_system); | 86 static void SetInstance(AudioSystem* audio_system); |
73 | 87 |
74 // Sets the global AudioSystem pointer to null if it equals the specified one. | 88 // Sets the global AudioSystem pointer to null if it equals the specified one. |
75 static void ClearInstance(const AudioSystem* audio_system); | 89 static void ClearInstance(const AudioSystem* audio_system); |
76 }; | 90 }; |
77 | 91 |
78 } // namespace media | 92 } // namespace media |
79 | 93 |
80 #endif // MEDIA_AUDIO_AUDIO_SYSTEM_H_ | 94 #endif // MEDIA_AUDIO_AUDIO_SYSTEM_H_ |
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