chromeos/audio/audio_devices_pref_handler_impl.cc

   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 #include "chromeos/audio/audio_devices_pref_handler_impl.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/bind_helpers.h"
  11 #include "base/logging.h"
  12 #include "base/prefs/pref_registry_simple.h"
  13 #include "base/prefs/pref_service.h"
  14 #include "base/prefs/scoped_user_pref_update.h"
  15 #include "base/strings/string_number_conversions.h"
  16 #include "chromeos/audio/audio_device.h"
  17 #include "chromeos/chromeos_pref_names.h"
  18
  19 namespace {
  20
  21 // Values used for muted preference.
  22 const int kPrefMuteOff = 0;
  23 const int kPrefMuteOn = 1;
  24
  25 // Gets the device id string for storing audio preference. The format of
  26 // device string is a string consisting of 3 parts.
  27 // |device_name| : |integer from lower 32 bit of device id| :
  28 // |0(output device) or 1(input device)|
  29 // If an audio device has both integrated input and output devices, the first 2
  30 // parts of the string could be identical, only the last part will differentiate
  31 // them.
  32 std::string GetDeviceIdString(const chromeos::AudioDevice& device) {
  33   std::string device_id_string =
  34       device.device_name + " : " +
  35       base::Uint64ToString(device.id & static_cast<uint64>(0xffffffff)) +
  36       " : " + (device.is_input ? "1" : "0");
  37   // Replace any periods from the device id string with a space, since setting
  38   // names cannot contain periods.
  39   std::replace(device_id_string.begin(), device_id_string.end(), '.', ' ');
  40   return device_id_string;
  41 }
  42
  43 }  // namespace
  44
  45 namespace chromeos {
  46
  47 double AudioDevicesPrefHandlerImpl::GetOutputVolumeValue(
  48     const AudioDevice* device) {
  49   if (!device)
  50     return kDefaultOutputVolumePercent;
  51   else
  52     return GetVolumeGainPrefValue(*device);
  53 }
  54
  55 double AudioDevicesPrefHandlerImpl::GetInputGainValue(
  56     const AudioDevice* device) {
  57   DCHECK(device);
  58   return GetVolumeGainPrefValue(*device);
  59 }
  60
  61 void AudioDevicesPrefHandlerImpl::SetVolumeGainValue(
  62     const AudioDevice& device, double value) {
  63   device_volume_settings_->SetDouble(GetDeviceIdString(device), value);
  64
  65   SaveDevicesVolumePref();
  66 }
  67
  68 bool AudioDevicesPrefHandlerImpl::GetMuteValue(const AudioDevice& device) {
  69   UpdateDevicesMutePref();
  70
  71   std::string device_id_str = GetDeviceIdString(device);
  72   if (!device_mute_settings_->HasKey(device_id_str))
  73     MigrateDeviceMuteSettings(device_id_str);
  74
  75   int mute = kPrefMuteOff;
  76   device_mute_settings_->GetInteger(device_id_str, &mute);
  77
  78   return (mute == kPrefMuteOn);
  79 }
  80
  81 void AudioDevicesPrefHandlerImpl::SetMuteValue(const AudioDevice& device,
  82                                                bool mute) {
  83   device_mute_settings_->SetInteger(GetDeviceIdString(device),
  84                                     mute ? kPrefMuteOn : kPrefMuteOff);
  85   SaveDevicesMutePref();
  86 }
  87
  88 bool AudioDevicesPrefHandlerImpl::GetAudioOutputAllowedValue() {
  89   return local_state_->GetBoolean(prefs::kAudioOutputAllowed);
  90 }
  91
  92 void AudioDevicesPrefHandlerImpl::AddAudioPrefObserver(
  93     AudioPrefObserver* observer) {
  94   observers_.AddObserver(observer);
  95 }
  96
  97 void AudioDevicesPrefHandlerImpl::RemoveAudioPrefObserver(
  98     AudioPrefObserver* observer) {
  99   observers_.RemoveObserver(observer);
 100 }
 101
 102 double AudioDevicesPrefHandlerImpl::GetVolumeGainPrefValue(
 103     const AudioDevice& device) {
 104   UpdateDevicesVolumePref();
 105
 106   std::string device_id_str = GetDeviceIdString(device);
 107   if (!device_volume_settings_->HasKey(device_id_str))
 108     MigrateDeviceVolumeSettings(device_id_str);
 109
 110   // TODO(jennyz, rkc): Return a meaningful input gain default value, when
 111   // cras has added support for normalizing input gain range.
 112   double value = device.is_input ?
 113       0.0 : GetDeviceDefaultOutputVolume(device);
 114   // TODO(rkc): The above code is completely ignored since we 'always' have a
 115   // default pref value. Fix this. http://crbug.com/442489
 116   device_volume_settings_->GetDouble(device_id_str, &value);
 117
 118   return value;
 119 }
 120
 121 double AudioDevicesPrefHandlerImpl::GetDeviceDefaultOutputVolume(
 122     const AudioDevice& device) {
 123   if (device.type == AUDIO_TYPE_HDMI)
 124     return kDefaultHdmiOutputVolumePercent;
 125   else
 126     return kDefaultOutputVolumePercent;
 127 }
 128
 129 AudioDevicesPrefHandlerImpl::AudioDevicesPrefHandlerImpl(
 130     PrefService* local_state)
 131     : device_mute_settings_(new base::DictionaryValue()),
 132       device_volume_settings_(new base::DictionaryValue()),
 133       local_state_(local_state) {
 134   InitializePrefObservers();
 135
 136   UpdateDevicesMutePref();
 137   UpdateDevicesVolumePref();
 138 }
 139
 140 AudioDevicesPrefHandlerImpl::~AudioDevicesPrefHandlerImpl() {
 141 }
 142
 143 void AudioDevicesPrefHandlerImpl::InitializePrefObservers() {
 144   pref_change_registrar_.Init(local_state_);
 145   base::Closure callback =
 146       base::Bind(&AudioDevicesPrefHandlerImpl::NotifyAudioPolicyChange,
 147                  base::Unretained(this));
 148   pref_change_registrar_.Add(prefs::kAudioOutputAllowed, callback);
 149 }
 150
 151 void AudioDevicesPrefHandlerImpl::UpdateDevicesMutePref() {
 152   const base::DictionaryValue* mute_prefs =
 153       local_state_->GetDictionary(prefs::kAudioDevicesMute);
 154   if (mute_prefs)
 155     device_mute_settings_.reset(mute_prefs->DeepCopy());
 156 }
 157
 158 void AudioDevicesPrefHandlerImpl::SaveDevicesMutePref() {
 159   DictionaryPrefUpdate dict_update(local_state_, prefs::kAudioDevicesMute);
 160   base::DictionaryValue::Iterator it(*device_mute_settings_);
 161   while (!it.IsAtEnd()) {
 162     int mute = kPrefMuteOff;
 163     it.value().GetAsInteger(&mute);
 164     dict_update->SetInteger(it.key(), mute);
 165     it.Advance();
 166   }
 167 }
 168
 169 void AudioDevicesPrefHandlerImpl::UpdateDevicesVolumePref() {
 170   const base::DictionaryValue* volume_prefs =
 171       local_state_->GetDictionary(prefs::kAudioDevicesVolumePercent);
 172   if (volume_prefs)
 173     device_volume_settings_.reset(volume_prefs->DeepCopy());
 174 }
 175
 176 void AudioDevicesPrefHandlerImpl::SaveDevicesVolumePref() {
 177   DictionaryPrefUpdate dict_update(local_state_,
 178                                    prefs::kAudioDevicesVolumePercent);
 179   base::DictionaryValue::Iterator it(*device_volume_settings_);
 180   while (!it.IsAtEnd()) {
 181     double volume = kDefaultOutputVolumePercent;
 182     bool success = it.value().GetAsDouble(&volume);
 183     DCHECK(success);
 184     dict_update->SetDouble(it.key(), volume);
 185     it.Advance();
 186   }
 187 }
 188
 189 void AudioDevicesPrefHandlerImpl::MigrateDeviceMuteSettings(
 190     std::string active_device) {
 191   int old_mute = local_state_->GetInteger(prefs::kAudioMute);
 192   device_mute_settings_->SetInteger(active_device, old_mute);
 193   SaveDevicesMutePref();
 194 }
 195
 196 void AudioDevicesPrefHandlerImpl::MigrateDeviceVolumeSettings(
 197     std::string active_device) {
 198   double old_volume = local_state_->GetDouble(prefs::kAudioVolumePercent);
 199   device_volume_settings_->SetDouble(active_device, old_volume);
 200   SaveDevicesVolumePref();
 201 }
 202
 203 void AudioDevicesPrefHandlerImpl::NotifyAudioPolicyChange() {
 204   FOR_EACH_OBSERVER(AudioPrefObserver,
 205                     observers_,
 206                     OnAudioPolicyPrefChanged());
 207 }
 208
 209 // static
 210 void AudioDevicesPrefHandlerImpl::RegisterPrefs(PrefRegistrySimple* registry) {
 211   registry->RegisterDictionaryPref(prefs::kAudioDevicesVolumePercent);
 212   registry->RegisterDictionaryPref(prefs::kAudioDevicesMute);
 213
 214   // Register the prefs backing the audio muting policies.
 215   // Policy for audio input is handled by kAudioCaptureAllowed in the Chrome
 216   // media system.
 217   registry->RegisterBooleanPref(prefs::kAudioOutputAllowed, true);
 218
 219   // Register the legacy audio prefs for migration.
 220   registry->RegisterDoublePref(prefs::kAudioVolumePercent,
 221                                kDefaultOutputVolumePercent);
 222   registry->RegisterIntegerPref(prefs::kAudioMute, kPrefMuteOff);
 223 }
 224
 225 }  // namespace chromeos