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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// Copyright 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 CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
#define CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
#include "base/memory/singleton.h"
#include "chrome/browser/media/media_capture_devices_dispatcher.h"
#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
class HotwordService;
class Profile;
// Singleton that owns all HotwordServices and associates them with Profiles.
class HotwordServiceFactory : public MediaCaptureDevicesDispatcher::Observer,
public BrowserContextKeyedServiceFactory {
public:
// Returns the HotwordService for |context|.
static HotwordService* GetForProfile(content::BrowserContext* context);
static HotwordServiceFactory* GetInstance();
// Returns true if the hotwording service is available for |context|.
static bool IsServiceAvailable(content::BrowserContext* context);
// Returns true if hotwording is allowed for |context|.
static bool IsHotwordAllowed(content::BrowserContext* context);
// Returns whether specialized hotword hardware exists.
static bool IsHotwordHardwareAvailable();
// Returns the current error message for the service for |context|.
// A value of 0 indicates no error.
static int GetCurrentError(content::BrowserContext* context);
// Returns the current known state of the microphone. Since this state
// is browser (not profile) specific, it resides in the factory.
static bool IsMicrophoneAvailable();
// Returns whether the state of the audio devices has been updated.
// Essentially it indicates the validity of the return value from
// IsMicrophoneAvailable().
static bool IsAudioDeviceStateUpdated();
// Overridden from MediaCaptureDevicesDispatcher::Observer
void OnUpdateAudioDevices(
const content::MediaStreamDevices& devices) override;
// This will kick off the monitor that calls OnUpdateAudioDevices when the
// number of audio devices changes (or is initialized). It needs to be a
// separate function so it can be called after the service is initialized
// (i.e., after startup). The monitor can't be initialized during startup
// because it would slow down startup too much so it is delayed and not
// called until it's needed by the webui in browser_options_handler.
void UpdateMicrophoneState();
private:
friend struct DefaultSingletonTraits<HotwordServiceFactory>;
HotwordServiceFactory();
~HotwordServiceFactory() override;
// Overrides from BrowserContextKeyedServiceFactory:
void RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) override;
KeyedService* BuildServiceInstanceFor(
content::BrowserContext* context) const override;
// Must be called from the UI thread since the instance of
// MediaCaptureDevicesDispatcher can only be accessed on the UI thread.
void InitializeMicrophoneObserver();
bool microphone_available() { return microphone_available_; }
bool microphone_available_;
// Indicates if the check for audio devices has been run such that it can be
// included in the error checking. Audio checking is not done immediately
// upon start up because of the negative impact on performance.
bool audio_device_state_updated_;
bool audio_device_state_updated() { return audio_device_state_updated_; }
DISALLOW_COPY_AND_ASSIGN(HotwordServiceFactory);
};
#endif // CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
|
