src/chrome/browser/search/hotword_service_factory.cc

   1 // Copyright 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 #include "chrome/browser/search/hotword_service_factory.h"
   6
   7 #include "base/prefs/pref_service.h"
   8 #include "chrome/browser/profiles/profile.h"
   9 #include "chrome/browser/search/hotword_service.h"
  10 #include "chrome/common/pref_names.h"
  11 #include "components/keyed_service/content/browser_context_dependency_manager.h"
  12 #include "components/pref_registry/pref_registry_syncable.h"
  13 #include "content/public/browser/browser_context.h"
  14 #include "content/public/browser/browser_thread.h"
  15
  16 using content::BrowserContext;
  17 using content::BrowserThread;
  18
  19 // static
  20 HotwordService* HotwordServiceFactory::GetForProfile(BrowserContext* context) {
  21   return static_cast<HotwordService*>(
  22       GetInstance()->GetServiceForBrowserContext(context, true));
  23 }
  24
  25 // static
  26 HotwordServiceFactory* HotwordServiceFactory::GetInstance() {
  27   return Singleton<HotwordServiceFactory>::get();
  28 }
  29
  30 // static
  31 bool HotwordServiceFactory::IsServiceAvailable(BrowserContext* context) {
  32   HotwordService* hotword_service = GetForProfile(context);
  33   return hotword_service && hotword_service->IsServiceAvailable();
  34 }
  35
  36 // static
  37 bool HotwordServiceFactory::IsHotwordAllowed(BrowserContext* context) {
  38   HotwordService* hotword_service = GetForProfile(context);
  39   return hotword_service && hotword_service->IsHotwordAllowed();
  40 }
  41
  42 // static
  43 int HotwordServiceFactory::GetCurrentError(BrowserContext* context) {
  44   HotwordService* hotword_service = GetForProfile(context);
  45   if (!hotword_service)
  46     return 0;
  47   return hotword_service->error_message();
  48 }
  49
  50 // static
  51 bool HotwordServiceFactory::IsMicrophoneAvailable() {
  52   return GetInstance()->microphone_available();
  53 }
  54
  55 HotwordServiceFactory::HotwordServiceFactory()
  56     : BrowserContextKeyedServiceFactory(
  57         "HotwordService",
  58         BrowserContextDependencyManager::GetInstance()),
  59       microphone_available_(false) {
  60   // No dependencies.
  61
  62   // Register with the device observer list to update the microphone
  63   // availability.
  64   BrowserThread::PostTask(
  65       BrowserThread::UI, FROM_HERE,
  66       base::Bind(&HotwordServiceFactory::InitializeMicrophoneObserver,
  67                  base::Unretained(this)));
  68 }
  69
  70 HotwordServiceFactory::~HotwordServiceFactory() {
  71 }
  72
  73 void HotwordServiceFactory::InitializeMicrophoneObserver() {
  74   MediaCaptureDevicesDispatcher::GetInstance()->AddObserver(this);
  75 }
  76
  77 void HotwordServiceFactory::OnUpdateAudioDevices(
  78     const content::MediaStreamDevices& devices) {
  79   microphone_available_ = !devices.empty();
  80 }
  81
  82 void HotwordServiceFactory::UpdateMicrophoneState() {
  83   // In order to trigger the monitor, just call getAudioCaptureDevices.
  84   content::MediaStreamDevices devices =
  85       MediaCaptureDevicesDispatcher::GetInstance()->GetAudioCaptureDevices();
  86
  87   // If the monitor had not previously been started, there may be 0 devices
  88   // even if that is not accurate. However, we can update the microphone
  89   // availability state now. Either the number of devices will be correct or
  90   // we know that the call above will start the monitor and the microphone
  91   // state will be updated very soon and call OnUpdateAudioDevices.
  92   OnUpdateAudioDevices(devices);
  93 }
  94
  95 void HotwordServiceFactory::RegisterProfilePrefs(
  96     user_prefs::PrefRegistrySyncable* prefs) {
  97   prefs->RegisterBooleanPref(prefs::kHotwordSearchEnabled,
  98                              false,
  99                              user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 100   // Although this is default true, users will not send back information to
 101   // Google unless they have opted-in to Hotwording at which point they must
 102   // also confirm that they wish this preference to be true or opt out of it.
 103   prefs->RegisterBooleanPref(prefs::kHotwordAudioLoggingEnabled,
 104                              true,
 105                              user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 106   prefs->RegisterStringPref(prefs::kHotwordPreviousLanguage,
 107                             std::string(),
 108                             user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 109   prefs->RegisterBooleanPref(prefs::kHotwordAlwaysOnSearchEnabled,
 110                              false,
 111                              user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 112 }
 113
 114 KeyedService* HotwordServiceFactory::BuildServiceInstanceFor(
 115     BrowserContext* context) const {
 116   return new HotwordService(Profile::FromBrowserContext(context));
 117 }