Switch Audio Preferences to per device.

chrome/browser/chromeos/audio/audio_devices_pref_handler_impl.cc

+// 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.
+
+#include "chrome/browser/chromeos/audio/audio_devices_pref_handler_impl.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/logging.h"
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
+#include "base/strings/string_number_conversions.h"
+#include "chrome/browser/prefs/scoped_user_pref_update.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/pref_names.h"
+#include "chromeos/audio/cras_audio_handler.h"
+
+namespace chromeos {
+
+namespace {
+
+// Default value for the volume pref, as a percent in the range [0.0, 100.0].
+const double kDefaultVolumePercent = 75.0;
+
+// Values used for muted preference.
+const int kPrefMuteOff = 0;
+const int kPrefMuteOn = 1;
+
+}  // namespace
+
+double AudioDevicesPrefHandlerImpl::GetOutputVolumeValue() {
+  if (!CrasAudioHandler::IsInitialized())
+    return kDefaultVolumePercent;
+
+  UpdateDevicesVolumePref();
+  std::string active_device_id = base::Uint64ToString(
+      CrasAudioHandler::Get()->GetActiveOutputNode());
+  if (!device_volume_settings_->HasKey(active_device_id))
+    MigrateDeviceVolumeSettings(active_device_id);
+  double volume = kDefaultVolumePercent;
+  device_volume_settings_->GetDouble(active_device_id, &volume);
+  return volume;
+}
+
+void AudioDevicesPrefHandlerImpl::SetOutputVolumeValue(double volume_percent) {
+  std::string active_device_id = base::Uint64ToString(
+      CrasAudioHandler::Get()->GetActiveOutputNode());
+  if (volume_percent > 100.0)
+    volume_percent = 100.0;
+  if (volume_percent < 0.0)
+    volume_percent = 0.0;
+  device_volume_settings_->SetDouble(active_device_id, volume_percent);
+  SaveDevicesVolumePref();
+}
+
+bool AudioDevicesPrefHandlerImpl::GetOutputMuteValue() {
+  if (!CrasAudioHandler::IsInitialized())
+    return false;
+
+  UpdateDevicesVolumePref();
+  std::string active_device_id = base::Uint64ToString(
+      CrasAudioHandler::Get()->GetActiveOutputNode());
+  if (!device_mute_settings_->HasKey(active_device_id))
+    MigrateDeviceMuteSettings(active_device_id);
+  int mute = kPrefMuteOff;
+  device_mute_settings_->GetInteger(active_device_id, &mute);
+  return (mute == kPrefMuteOn);
+}
+
+void AudioDevicesPrefHandlerImpl::SetOutputMuteValue(bool mute) {
+  std::string active_device_id = base::Uint64ToString(
+      CrasAudioHandler::Get()->GetActiveOutputNode());
+  device_mute_settings_->SetBoolean(active_device_id,
+                                   mute ? kPrefMuteOn : kPrefMuteOff);
+  SaveDevicesVolumePref();
+}
+
+bool AudioDevicesPrefHandlerImpl::GetAudioCaptureAllowedValue() {
+  return local_state_->GetBoolean(prefs::kAudioCaptureAllowed);
+}
+
+bool AudioDevicesPrefHandlerImpl::GetAudioOutputAllowedValue() {
+  return local_state_->GetBoolean(prefs::kAudioOutputAllowed);
+}
+
+void AudioDevicesPrefHandlerImpl::AddAudioPrefObserver(
+    AudioPrefObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void AudioDevicesPrefHandlerImpl::RemoveAudioPrefObserver(
+    AudioPrefObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+AudioDevicesPrefHandlerImpl::AudioDevicesPrefHandlerImpl(
+    PrefService* local_state)
+    : device_mute_settings_(new base::DictionaryValue()),
+      device_volume_settings_(new base::DictionaryValue()),
+      local_state_(local_state) {
+  InitializePrefObservers();
+
+  UpdateDevicesMutePref();
+  UpdateDevicesVolumePref();
+}
+
+AudioDevicesPrefHandlerImpl::~AudioDevicesPrefHandlerImpl() {
+};
+
+void AudioDevicesPrefHandlerImpl::InitializePrefObservers() {
+  pref_change_registrar_.Init(local_state_);
+  base::Closure callback =
+      base::Bind(&AudioDevicesPrefHandlerImpl::NotifyAudioPolicyChange,
+                 base::Unretained(this));
+  pref_change_registrar_.Add(prefs::kAudioOutputAllowed, callback);
+  pref_change_registrar_.Add(prefs::kAudioCaptureAllowed, callback);
+}
+
+void AudioDevicesPrefHandlerImpl::UpdateDevicesMutePref() {
+  const base::DictionaryValue* mute_prefs =
+      local_state_->GetDictionary(prefs::kAudioDevicesMute);
+  if (mute_prefs)
+    device_mute_settings_.reset(mute_prefs->DeepCopy());
+}
+
+void AudioDevicesPrefHandlerImpl::SaveDevicesMutePref() {
+  DictionaryPrefUpdate dict_update(local_state_, prefs::kAudioDevicesMute);
+  base::DictionaryValue::Iterator it(*device_mute_settings_);
+  while (!it.IsAtEnd()) {
+    int mute = kPrefMuteOff;
+    it.value().GetAsInteger(&mute);
+    dict_update->Set(it.key(), new base::FundamentalValue(mute));
+    it.Advance();
+  }
+}
+
+void AudioDevicesPrefHandlerImpl::UpdateDevicesVolumePref() {
+  const base::DictionaryValue* volume_prefs =
+      local_state_->GetDictionary(prefs::kAudioDevicesVolumePercent);
+  if (volume_prefs)
+    device_volume_settings_.reset(volume_prefs->DeepCopy());
+}
+
+void AudioDevicesPrefHandlerImpl::SaveDevicesVolumePref() {
+  DictionaryPrefUpdate dict_update(local_state_,
+                                   prefs::kAudioDevicesVolumePercent);
+  base::DictionaryValue::Iterator it(*device_volume_settings_);
+  while (!it.IsAtEnd()) {
+    double volume = kDefaultVolumePercent;
+    it.value().GetAsDouble(&volume);
+    dict_update->Set(it.key(), new base::FundamentalValue(volume));
+    it.Advance();
+  }
+}
+
+void AudioDevicesPrefHandlerImpl::MigrateDeviceMuteSettings(
+    std::string active_device) {
+  int old_mute = local_state_->GetInteger(prefs::kAudioMute);
+  device_mute_settings_->SetInteger(active_device, old_mute);
+  SaveDevicesMutePref();
+}
+
+void AudioDevicesPrefHandlerImpl::MigrateDeviceVolumeSettings(
+    std::string active_device) {
+  double old_volume = local_state_->GetDouble(prefs::kAudioVolumePercent);
+  device_volume_settings_->SetDouble(active_device, old_volume);
+  SaveDevicesVolumePref();
+}
+
+void AudioDevicesPrefHandlerImpl::NotifyAudioPolicyChange() {
+  FOR_EACH_OBSERVER(AudioPrefObserver,
+                    observers_,
+                    OnAudioPolicyPrefChanged());
+}
+
+// static
+void AudioDevicesPrefHandlerImpl::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterDictionaryPref(prefs::kAudioDevicesVolumePercent);
+  registry->RegisterDictionaryPref(prefs::kAudioDevicesMute);
+
+  // TODO(jennyz,rkc): Move the rest of the preferences registered by
+  // AudioPrefHandlerImpl::RegisterPrefs here once we remove the old audio
+  // handler code.
+}
+
+// static
+AudioDevicesPrefHandler* AudioDevicesPrefHandler::Create(
+    PrefService* local_state) {
+  return new AudioDevicesPrefHandlerImpl(local_state);
+}
+
+}  // namespace chromeos