blob: 53a3fceb729b68f965e07d61c92c3dc4f180e70e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
// Copyright (c) 2013 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 CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_
#define CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "chromeos/audio/audio_pref_observer.h"
#include "chromeos/chromeos_export.h"
class PrefService;
namespace chromeos {
struct AudioDevice;
// Interface that handles audio preference related work, reads and writes
// audio preferences, and notifies AudioPrefObserver for audio preference
// changes.
class CHROMEOS_EXPORT AudioDevicesPrefHandler
: public base::RefCountedThreadSafe<AudioDevicesPrefHandler> {
public:
// Gets the audio output volume value from prefs for a device. Since we can
// only have either a gain or a volume for a device (depending on whether it
// is input or output), we don't really care which value it is.
virtual double GetOutputVolumeValue(const AudioDevice* device) = 0;
virtual double GetInputGainValue(const AudioDevice* device) = 0;
// Sets the audio volume or gain value to prefs for a device.
virtual void SetVolumeGainValue(const AudioDevice& device, double value) = 0;
// Reads the audio mute value from prefs for a device.
virtual bool GetMuteValue(const AudioDevice& device) = 0;
// Sets the audio mute value to prefs for a device.
virtual void SetMuteValue(const AudioDevice& device, bool mute_on) = 0;
// Reads the audio capture allowed value from prefs, which can be used to
// disable audio capture via policy.
virtual bool GetAudioCaptureAllowedValue() = 0;
// Reads the audio output allowed value from prefs.
virtual bool GetAudioOutputAllowedValue() = 0;
// Adds an audio preference observer.
virtual void AddAudioPrefObserver(AudioPrefObserver* observer) = 0;
// Removes an audio preference observer.
virtual void RemoveAudioPrefObserver(AudioPrefObserver* observer) = 0;
protected:
virtual ~AudioDevicesPrefHandler() {}
private:
friend class base::RefCountedThreadSafe<AudioDevicesPrefHandler>;
};
} // namespace chromeos
#endif // CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_
|
