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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_BROWSER_EXTENSIONS_API_AUDIO_AUDIO_SERVICE_H_ | |
6 #define CHROME_BROWSER_EXTENSIONS_API_AUDIO_AUDIO_SERVICE_H_ | |
7 | |
8 #include "base/basictypes.h" | |
9 #include "base/callback.h" | |
10 #include "chrome/common/extensions/api/audio.h" | |
11 | |
12 namespace extensions { | |
13 | |
14 typedef std::vector<linked_ptr<api::audio::OutputDeviceInfo> > OutputInfo; | |
15 typedef std::vector<linked_ptr<api::audio::InputDeviceInfo> > InputInfo; | |
16 | |
17 class AudioService { | |
18 public: | |
19 class Observer { | |
20 public: | |
21 // Called when anything changes to the audio device configuration. | |
22 virtual void OnDeviceChanged() = 0; | |
23 | |
24 protected: | |
25 virtual ~Observer() {} | |
26 }; | |
27 | |
28 // Callback type for completing to get audio device information. | |
29 typedef base::Callback<void(const OutputInfo&, const InputInfo&, bool)> | |
30 GetInfoCallback; | |
31 | |
32 // Creates a platform-specific AudioService instance. | |
33 static AudioService* CreateInstance(); | |
34 | |
35 virtual ~AudioService() {} | |
36 | |
37 // Called by listeners to this service to add/remove themselves as observers. | |
38 virtual void AddObserver(Observer* observer) = 0; | |
39 virtual void RemoveObserver(Observer* observer) = 0; | |
40 | |
41 // Start to query audio device information. Should be called on UI thread. | |
42 // The |callbac| will be invoked once the query is completed. | |
rkc
2013/04/22 22:54:19
|callback|
hshi1
2013/04/22 23:02:16
Done.
| |
43 virtual void StartGetInfo(const GetInfoCallback& callback) = 0; | |
44 | |
45 protected: | |
46 AudioService() {} | |
47 | |
48 DISALLOW_COPY_AND_ASSIGN(AudioService); | |
49 }; | |
50 | |
51 | |
52 } // namespace extensions | |
53 | |
54 #endif // CHROME_BROWSER_EXTENSIONS_API_AUDIO_AUDIO_SERVICE_H_ | |
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