chrome/browser/search/hotword_service_factory.h

   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 #ifndef CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
   6 #define CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_
   7
   8 #include "base/memory/singleton.h"
   9 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
  10 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
  11
  12 class HotwordService;
  13 class Profile;
  14
  15 // Singleton that owns all HotwordServices and associates them with Profiles.
  16 class HotwordServiceFactory : public MediaCaptureDevicesDispatcher::Observer,
  17                               public BrowserContextKeyedServiceFactory {
  18  public:
  19   // Returns the HotwordService for |context|.
  20   static HotwordService* GetForProfile(content::BrowserContext* context);
  21
  22   static HotwordServiceFactory* GetInstance();
  23
  24   // Returns true if the hotwording service is available for |context|.
  25   static bool IsServiceAvailable(content::BrowserContext* context);
  26
  27   // Returns true if hotwording is allowed for |context|.
  28   static bool IsHotwordAllowed(content::BrowserContext* context);
  29
  30   // Returns whether specialized hotword hardware exists.
  31   static bool IsHotwordHardwareAvailable();
  32
  33   // Returns the current error message for the service for |context|.
  34   // A value of 0 indicates no error.
  35   static int GetCurrentError(content::BrowserContext* context);
  36
  37   // Returns the current known state of the microphone. Since this state
  38   // is browser (not profile) specific, it resides in the factory.
  39   static bool IsMicrophoneAvailable();
  40
  41   // Returns whether the state of the audio devices has been updated.
  42   // Essentially it indicates the validity of the return value from
  43   // IsMicrophoneAvailable().
  44   static bool IsAudioDeviceStateUpdated();
  45
  46   // Overridden from MediaCaptureDevicesDispatcher::Observer
  47   void OnUpdateAudioDevices(
  48       const content::MediaStreamDevices& devices) override;
  49
  50   // This will kick off the monitor that calls OnUpdateAudioDevices when the
  51   // number of audio devices changes (or is initialized). It needs to be a
  52   // separate function so it can be called after the service is initialized
  53   // (i.e., after startup). The monitor can't be initialized during startup
  54   // because it would slow down startup too much so it is delayed and not
  55   // called until it's needed by the webui in browser_options_handler.
  56   void UpdateMicrophoneState();
  57
  58  private:
  59   friend struct DefaultSingletonTraits<HotwordServiceFactory>;
  60
  61   HotwordServiceFactory();
  62   ~HotwordServiceFactory() override;
  63
  64   // Overrides from BrowserContextKeyedServiceFactory:
  65   void RegisterProfilePrefs(
  66       user_prefs::PrefRegistrySyncable* registry) override;
  67   KeyedService* BuildServiceInstanceFor(
  68       content::BrowserContext* context) const override;
  69
  70   // Must be called from the UI thread since the instance of
  71   // MediaCaptureDevicesDispatcher can only be accessed on the UI thread.
  72   void InitializeMicrophoneObserver();
  73
  74   bool microphone_available() { return microphone_available_; }
  75
  76   bool microphone_available_;
  77
  78   // Indicates if the check for audio devices has been run such that it can be
  79   // included in the error checking. Audio checking is not done immediately
  80   // upon start up because of the negative impact on performance.
  81   bool audio_device_state_updated_;
  82
  83   bool audio_device_state_updated() { return audio_device_state_updated_; }
  84
  85   DISALLOW_COPY_AND_ASSIGN(HotwordServiceFactory);
  86 };
  87
  88 #endif  // CHROME_BROWSER_SEARCH_HOTWORD_SERVICE_FACTORY_H_