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// 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 <memory>
#include <string>
#include "base/component_export.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/values.h"
#include "chromeos/audio/audio_devices_pref_handler.h"
#include "components/prefs/pref_change_registrar.h"
class PrefRegistrySimple;
class PrefService;
namespace chromeos {
// Class which implements AudioDevicesPrefHandler interface and register audio
// preferences as well.
class COMPONENT_EXPORT(CHROMEOS_AUDIO) AudioDevicesPrefHandlerImpl
: public AudioDevicesPrefHandler {
// |local_state| is the device-wide preference service.
explicit AudioDevicesPrefHandlerImpl(PrefService* local_state);
// Overridden from AudioDevicesPrefHandler.
double GetOutputVolumeValue(const AudioDevice* device) override;
double GetInputGainValue(const AudioDevice* device) override;
void SetVolumeGainValue(const AudioDevice& device, double value) override;
bool GetMuteValue(const AudioDevice& device) override;
void SetMuteValue(const AudioDevice& device, bool mute_on) override;
void SetDeviceActive(const AudioDevice& device,
bool active,
bool activate_by_user) override;
bool GetDeviceActive(const AudioDevice& device,
bool* active,
bool* activate_by_user) override;
bool GetAudioOutputAllowedValue() override;
void AddAudioPrefObserver(AudioPrefObserver* observer) override;
void RemoveAudioPrefObserver(AudioPrefObserver* observer) override;
// Registers volume and mute preferences.
static void RegisterPrefs(PrefRegistrySimple* registry);
~AudioDevicesPrefHandlerImpl() override;
// Initializes the observers for the policy prefs.
void InitializePrefObservers();
// Load and save methods for the mute preferences for all devices.
void LoadDevicesMutePref();
void SaveDevicesMutePref();
// Load and save methods for the volume preferences for all devices.
void LoadDevicesVolumePref();
void SaveDevicesVolumePref();
// Load and save methods for the active state for all devices.
void LoadDevicesStatePref();
void SaveDevicesStatePref();
double GetVolumeGainPrefValue(const AudioDevice& device);
double GetDeviceDefaultOutputVolume(const AudioDevice& device);
// Migrates devices state pref for an audio device. Device settings are
// saved under device stable device ID - this method migrates device state
// for a device that is saved under key derived from v1 stable device ID to
// |device_key|. Note that |device_key| should be the key derived from
// |device|'s v2 stable device ID.
bool MigrateDevicesStatePref(const std::string& device_key,
const AudioDevice& device);
// Methods to migrate the mute and volume settings for an audio device.
// Migration is done in the folowing way:
// 1. If there is a setting for the device under |device_key|, do nothing.
// (Note that |device_key| is expected to be the key derived from
// |device's| v2 stable device ID).
// 2. If there is a setting for the device under the key derived from
// |device|'s v1 stable device ID, move the value to |device_key|.
// 3. If a previous global pref value exists, move it to the per device
// setting (under |device_key|).
// 4. If a previous global setting is not set, use default values of
// mute = off and volume = 75%.
void MigrateDeviceMuteSettings(const std::string& device_key,
const AudioDevice& device);
void MigrateDeviceVolumeGainSettings(const std::string& device_key,
const AudioDevice& device);
// Notifies the AudioPrefObserver for audio policy pref changes.
void NotifyAudioPolicyChange();
std::unique_ptr<base::DictionaryValue> device_mute_settings_;
std::unique_ptr<base::DictionaryValue> device_volume_settings_;
std::unique_ptr<base::DictionaryValue> device_state_settings_;
PrefService* local_state_; // not owned
PrefChangeRegistrar pref_change_registrar_;
base::ObserverList<AudioPrefObserver>::Unchecked observers_;
} // namespace chromeos