diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index bcd8c7d..2f86efe 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -9926,6 +9926,13 @@
         public static final String SPATIAL_AUDIO_ENABLED = "spatial_audio_enabled";
 
         /**
+         * Internal collection of audio device inventory items
+         * The device item stored are {@link com.android.server.audio.AdiDeviceState}
+         * @hide
+         */
+        public static final String AUDIO_DEVICE_INVENTORY = "audio_device_inventory";
+
+        /**
          * Indicates whether notification display on the lock screen is enabled.
          * <p>
          * Type: int (0 for false, 1 for true)
diff --git a/packages/SettingsProvider/test/src/android/provider/SettingsBackupTest.java b/packages/SettingsProvider/test/src/android/provider/SettingsBackupTest.java
index 57585e5..618f7ed 100644
--- a/packages/SettingsProvider/test/src/android/provider/SettingsBackupTest.java
+++ b/packages/SettingsProvider/test/src/android/provider/SettingsBackupTest.java
@@ -712,6 +712,7 @@
                  Settings.Secure.AUTOMATIC_STORAGE_MANAGER_ENABLED,
                  Settings.Secure.AUTOMATIC_STORAGE_MANAGER_LAST_RUN,
                  Settings.Secure.AUTOMATIC_STORAGE_MANAGER_TURNED_OFF_BY_POLICY,
+                 Settings.Secure.AUDIO_DEVICE_INVENTORY, // setting not controllable by user
                  Settings.Secure.BACKUP_AUTO_RESTORE,
                  Settings.Secure.BACKUP_ENABLED,
                  Settings.Secure.BACKUP_PROVISIONED,
diff --git a/services/core/java/com/android/server/audio/AdiDeviceState.java b/services/core/java/com/android/server/audio/AdiDeviceState.java
new file mode 100644
index 0000000..683b3eb
--- /dev/null
+++ b/services/core/java/com/android/server/audio/AdiDeviceState.java
@@ -0,0 +1,204 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.audio;
+
+import static android.media.AudioSystem.DEVICE_NONE;
+import static android.media.AudioSystem.isBluetoothDevice;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.media.AudioDeviceAttributes;
+import android.media.AudioDeviceInfo;
+import android.text.TextUtils;
+import android.util.Log;
+
+import java.util.Objects;
+
+/**
+ * Class representing all devices that were previously or are currently connected. Data is
+ * persisted in {@link android.provider.Settings.Secure}
+ */
+/*package*/ final class AdiDeviceState {
+    private static final String TAG = "AS.AdiDeviceState";
+
+    private static final String SETTING_FIELD_SEPARATOR = ",";
+
+    @AudioDeviceInfo.AudioDeviceType
+    private final int mDeviceType;
+
+    private final int mInternalDeviceType;
+    @NonNull
+    private final String mDeviceAddress;
+    private boolean mSAEnabled;
+    private boolean mHasHeadTracker = false;
+    private boolean mHeadTrackerEnabled;
+
+    /**
+     * Constructor
+     *
+     * @param deviceType external audio device type
+     * @param internalDeviceType if not set pass {@link DEVICE_NONE}, in this case the
+     *                           default conversion of the external type will be used
+     * @param address must be non-null for wireless devices
+     * @throws NullPointerException if a null address is passed for a wireless device
+     */
+    AdiDeviceState(@AudioDeviceInfo.AudioDeviceType int deviceType,
+                        int internalDeviceType,
+                        @Nullable String address) {
+        mDeviceType = deviceType;
+        if (internalDeviceType != DEVICE_NONE) {
+            mInternalDeviceType = internalDeviceType;
+        } else {
+            mInternalDeviceType = AudioDeviceInfo.convertDeviceTypeToInternalDevice(deviceType);
+
+        }
+        mDeviceAddress = isBluetoothDevice(mInternalDeviceType) ? Objects.requireNonNull(
+                address) : "";
+    }
+
+    @AudioDeviceInfo.AudioDeviceType
+    public int getDeviceType() {
+        return mDeviceType;
+    }
+
+    public int getInternalDeviceType() {
+        return mInternalDeviceType;
+    }
+
+    @NonNull
+    public String getDeviceAddress() {
+        return mDeviceAddress;
+    }
+
+    public void setSAEnabled(boolean sAEnabled) {
+        mSAEnabled = sAEnabled;
+    }
+
+    public boolean isSAEnabled() {
+        return mSAEnabled;
+    }
+
+    public void setHeadTrackerEnabled(boolean headTrackerEnabled) {
+        mHeadTrackerEnabled = headTrackerEnabled;
+    }
+
+    public boolean isHeadTrackerEnabled() {
+        return mHeadTrackerEnabled;
+    }
+
+    public void setHasHeadTracker(boolean hasHeadTracker) {
+        mHasHeadTracker = hasHeadTracker;
+    }
+
+
+    public boolean hasHeadTracker() {
+        return mHasHeadTracker;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        // type check and cast
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final AdiDeviceState sads = (AdiDeviceState) obj;
+        return mDeviceType == sads.mDeviceType
+                && mInternalDeviceType == sads.mInternalDeviceType
+                && mDeviceAddress.equals(sads.mDeviceAddress)  // NonNull
+                && mSAEnabled == sads.mSAEnabled
+                && mHasHeadTracker == sads.mHasHeadTracker
+                && mHeadTrackerEnabled == sads.mHeadTrackerEnabled;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mDeviceType, mInternalDeviceType, mDeviceAddress, mSAEnabled,
+                mHasHeadTracker, mHeadTrackerEnabled);
+    }
+
+    @Override
+    public String toString() {
+        return "type: " + mDeviceType + "internal type: " + mInternalDeviceType
+                + " addr: " + mDeviceAddress + " enabled: " + mSAEnabled
+                + " HT: " + mHasHeadTracker + " HTenabled: " + mHeadTrackerEnabled;
+    }
+
+    public String toPersistableString() {
+        return (new StringBuilder().append(mDeviceType)
+                .append(SETTING_FIELD_SEPARATOR).append(mDeviceAddress)
+                .append(SETTING_FIELD_SEPARATOR).append(mSAEnabled ? "1" : "0")
+                .append(SETTING_FIELD_SEPARATOR).append(mHasHeadTracker ? "1" : "0")
+                .append(SETTING_FIELD_SEPARATOR).append(mHeadTrackerEnabled ? "1" : "0")
+                .append(SETTING_FIELD_SEPARATOR).append(mInternalDeviceType)
+                .toString());
+    }
+
+    /**
+     * Gets the max size (including separators) when persisting the elements with
+     * {@link AdiDeviceState#toPersistableString()}.
+     */
+    public static int getPeristedMaxSize() {
+        return 36;  /* (mDeviceType)2 + (mDeviceAddresss)17 + (mInternalDeviceType)9 + (mSAEnabled)1
+                           + (mHasHeadTracker)1 + (mHasHeadTrackerEnabled)1
+                           + (SETTINGS_FIELD_SEPARATOR)5 */
+    }
+
+    @Nullable
+    public static AdiDeviceState fromPersistedString(@Nullable String persistedString) {
+        if (persistedString == null) {
+            return null;
+        }
+        if (persistedString.isEmpty()) {
+            return null;
+        }
+        String[] fields = TextUtils.split(persistedString, SETTING_FIELD_SEPARATOR);
+        // we may have 5 fields for the legacy AdiDeviceState and 6 containing the internal
+        // device type
+        if (fields.length != 5 && fields.length != 6) {
+            // expecting all fields, fewer may mean corruption, ignore those settings
+            return null;
+        }
+        try {
+            final int deviceType = Integer.parseInt(fields[0]);
+            int internalDeviceType = -1;
+            if (fields.length == 6) {
+                internalDeviceType = Integer.parseInt(fields[5]);
+            }
+            final AdiDeviceState deviceState = new AdiDeviceState(deviceType,
+                    internalDeviceType, fields[1]);
+            deviceState.setHasHeadTracker(Integer.parseInt(fields[2]) == 1);
+            deviceState.setHasHeadTracker(Integer.parseInt(fields[3]) == 1);
+            deviceState.setHeadTrackerEnabled(Integer.parseInt(fields[4]) == 1);
+            return deviceState;
+        } catch (NumberFormatException e) {
+            Log.e(TAG, "unable to parse setting for AdiDeviceState: " + persistedString, e);
+            return null;
+        }
+    }
+
+    public AudioDeviceAttributes getAudioDeviceAttributes() {
+        return new AudioDeviceAttributes(AudioDeviceAttributes.ROLE_OUTPUT,
+                mDeviceType, mDeviceAddress);
+    }
+
+}
diff --git a/services/core/java/com/android/server/audio/AudioDeviceBroker.java b/services/core/java/com/android/server/audio/AudioDeviceBroker.java
index 4949235..de8334a 100644
--- a/services/core/java/com/android/server/audio/AudioDeviceBroker.java
+++ b/services/core/java/com/android/server/audio/AudioDeviceBroker.java
@@ -50,6 +50,7 @@
 import android.os.RemoteException;
 import android.os.SystemClock;
 import android.os.UserHandle;
+import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.Log;
 import android.util.PrintWriterPrinter;
@@ -69,8 +70,11 @@
 import java.util.concurrent.atomic.AtomicBoolean;
 
 
-/** @hide */
-/*package*/ final class AudioDeviceBroker {
+/**
+ * @hide
+ * (non final for mocking/spying)
+ */
+public class AudioDeviceBroker {
 
     private static final String TAG = "AS.AudioDeviceBroker";
 
@@ -1850,6 +1854,9 @@
                     final BluetoothDevice btDevice = (BluetoothDevice) msg.obj;
                     BtHelper.onNotifyPreferredAudioProfileApplied(btDevice);
                 } break;
+                case MSG_PERSIST_AUDIO_DEVICE_SETTINGS:
+                    onPersistAudioDeviceSettings();
+                    break;
                 default:
                     Log.wtf(TAG, "Invalid message " + msg.what);
             }
@@ -1927,6 +1934,8 @@
 
     private static final int MSG_L_NOTIFY_PREFERRED_AUDIOPROFILE_APPLIED = 52;
 
+    private static final int MSG_PERSIST_AUDIO_DEVICE_SETTINGS = 54;
+
     private static boolean isMessageHandledUnderWakelock(int msgId) {
         switch(msgId) {
             case MSG_L_SET_WIRED_DEVICE_CONNECTION_STATE:
@@ -2354,4 +2363,95 @@
                 info.getId(),
                 null /*mixerAttributes*/);
     }
+
+    /**
+     * post a message to persist the audio device settings.
+     * Message is delayed by 1s on purpose in case of successive changes in quick succession (at
+     * init time for instance)
+     * Note this method is made public to work around a Mockito bug where it needs to be public
+     * in order to be mocked by a test a the same package
+     * (see https://code.google.com/archive/p/mockito/issues/127)
+     */
+    public void persistAudioDeviceSettings() {
+        sendMsg(MSG_PERSIST_AUDIO_DEVICE_SETTINGS, SENDMSG_REPLACE, /*delay*/ 1000);
+    }
+
+    void onPersistAudioDeviceSettings() {
+        final String deviceSettings = mDeviceInventory.getDeviceSettings();
+        Log.v(TAG, "saving audio device settings: " + deviceSettings);
+        final SettingsAdapter settings = mAudioService.getSettings();
+        boolean res = settings.putSecureStringForUser(mAudioService.getContentResolver(),
+                Settings.Secure.AUDIO_DEVICE_INVENTORY,
+                deviceSettings, UserHandle.USER_CURRENT);
+        if (!res) {
+            Log.e(TAG, "error saving audio device settings: " + deviceSettings);
+        }
+    }
+
+    void onReadAudioDeviceSettings() {
+        final SettingsAdapter settingsAdapter = mAudioService.getSettings();
+        final ContentResolver contentResolver = mAudioService.getContentResolver();
+        String settings = settingsAdapter.getSecureStringForUser(contentResolver,
+                Settings.Secure.AUDIO_DEVICE_INVENTORY, UserHandle.USER_CURRENT);
+        if (settings == null) {
+            Log.i(TAG, "reading spatial audio device settings from legacy key"
+                    + Settings.Secure.SPATIAL_AUDIO_ENABLED);
+            // legacy string format for key SPATIAL_AUDIO_ENABLED has the same order of fields like
+            // the strings for key AUDIO_DEVICE_INVENTORY. This will ensure to construct valid
+            // device settings when calling {@link #setDeviceSettings()}
+            settings = settingsAdapter.getSecureStringForUser(contentResolver,
+                    Settings.Secure.SPATIAL_AUDIO_ENABLED, UserHandle.USER_CURRENT);
+            if (settings == null) {
+                Log.i(TAG, "no spatial audio device settings stored with legacy key");
+            } else if (!settings.equals("")) {
+                // Delete old key value and update the new key
+                if (!settingsAdapter.putSecureStringForUser(contentResolver,
+                        Settings.Secure.SPATIAL_AUDIO_ENABLED,
+                        /*value=*/"",
+                        UserHandle.USER_CURRENT)) {
+                    Log.w(TAG, "cannot erase the legacy audio device settings with key "
+                            + Settings.Secure.SPATIAL_AUDIO_ENABLED);
+                }
+                if (!settingsAdapter.putSecureStringForUser(contentResolver,
+                        Settings.Secure.AUDIO_DEVICE_INVENTORY,
+                        settings,
+                        UserHandle.USER_CURRENT)) {
+                    Log.e(TAG, "error updating the new audio device settings with key "
+                            + Settings.Secure.AUDIO_DEVICE_INVENTORY);
+                }
+            }
+        }
+
+        if (settings != null && !settings.equals("")) {
+            setDeviceSettings(settings);
+        }
+    }
+
+    void setDeviceSettings(String settings) {
+        mDeviceInventory.setDeviceSettings(settings);
+    }
+
+    /** Test only method. */
+    String getDeviceSettings() {
+        return mDeviceInventory.getDeviceSettings();
+    }
+
+    List<AdiDeviceState> getImmutableDeviceInventory() {
+        return mDeviceInventory.getImmutableDeviceInventory();
+    }
+
+    void addDeviceStateToInventory(AdiDeviceState deviceState) {
+        mDeviceInventory.addDeviceStateToInventory(deviceState);
+    }
+
+    AdiDeviceState findDeviceStateForAudioDeviceAttributes(AudioDeviceAttributes ada,
+            int canonicalType) {
+        return mDeviceInventory.findDeviceStateForAudioDeviceAttributes(ada, canonicalType);
+    }
+
+    //------------------------------------------------
+    // for testing purposes only
+    void clearDeviceInventory() {
+        mDeviceInventory.clearDeviceInventory();
+    }
 }
diff --git a/services/core/java/com/android/server/audio/AudioDeviceInventory.java b/services/core/java/com/android/server/audio/AudioDeviceInventory.java
index 0c7f11f..b4ab14f 100644
--- a/services/core/java/com/android/server/audio/AudioDeviceInventory.java
+++ b/services/core/java/com/android/server/audio/AudioDeviceInventory.java
@@ -15,6 +15,8 @@
  */
 package com.android.server.audio;
 
+import static android.media.AudioSystem.isBluetoothDevice;
+
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.bluetooth.BluetoothAdapter;
@@ -78,12 +80,51 @@
 
     private static final String TAG = "AS.AudioDeviceInventory";
 
+    private static final String SETTING_DEVICE_SEPARATOR_CHAR = "|";
+    private static final String SETTING_DEVICE_SEPARATOR = "\\|";
+
     // lock to synchronize all access to mConnectedDevices and mApmConnectedDevices
     private final Object mDevicesLock = new Object();
 
     //Audio Analytics ids.
     private static final String mMetricsId = "audio.device.";
 
+    private final Object mDeviceInventoryLock = new Object();
+    @GuardedBy("mDeviceCatalogLock")
+    private final ArrayList<AdiDeviceState> mDeviceInventory = new ArrayList<>(0);
+    List<AdiDeviceState> getImmutableDeviceInventory() {
+        synchronized (mDeviceInventoryLock) {
+            return List.copyOf(mDeviceInventory);
+        }
+    }
+
+    void addDeviceStateToInventory(AdiDeviceState deviceState) {
+        synchronized (mDeviceInventoryLock) {
+            mDeviceInventory.add(deviceState);
+        }
+    }
+
+    AdiDeviceState findDeviceStateForAudioDeviceAttributes(AudioDeviceAttributes ada,
+            int canonicalDeviceType) {
+        final boolean isWireless = isBluetoothDevice(ada.getInternalType());
+        synchronized (mDeviceInventoryLock) {
+            for (AdiDeviceState deviceSetting : mDeviceInventory) {
+                if (deviceSetting.getDeviceType() == canonicalDeviceType
+                        && (!isWireless || ada.getAddress().equals(
+                        deviceSetting.getDeviceAddress()))) {
+                    return deviceSetting;
+                }
+            }
+        }
+        return null;
+    }
+
+    void clearDeviceInventory() {
+        synchronized (mDeviceInventoryLock) {
+            mDeviceInventory.clear();
+        }
+    }
+
     // List of connected devices
     // Key for map created from DeviceInfo.makeDeviceListKey()
     @GuardedBy("mDevicesLock")
@@ -341,6 +382,12 @@
         mAppliedPresetRolesInt.forEach((key, devices) -> {
             pw.println("  " + prefix + "preset: " + key.first
                     +  " role:" + key.second + " devices:" + devices); });
+        pw.println("\ndevices:\n");
+        synchronized (mDeviceInventoryLock) {
+            for (AdiDeviceState device : mDeviceInventory) {
+                pw.println("\t" + device + "\n");
+            }
+        }
     }
 
     //------------------------------------------------------------
@@ -1198,7 +1245,7 @@
 
                     AudioDeviceInfo device = Stream.of(connectedDevices)
                             .filter(d -> d.getInternalType() == ada.getInternalType())
-                            .filter(d -> (!AudioSystem.isBluetoothDevice(d.getInternalType())
+                            .filter(d -> (!isBluetoothDevice(d.getInternalType())
                                             || (d.getAddress().equals(ada.getAddress()))))
                             .findFirst()
                             .orElse(null);
@@ -1619,7 +1666,7 @@
         }
 
         for (DeviceInfo di : mConnectedDevices.values()) {
-            if (!AudioSystem.isBluetoothDevice(di.mDeviceType)) {
+            if (!isBluetoothDevice(di.mDeviceType)) {
                 continue;
             }
             AudioDeviceAttributes ada =
@@ -1733,7 +1780,7 @@
         }
         HashSet<String> processedAddresses = new HashSet<>(0);
         for (DeviceInfo di : mConnectedDevices.values()) {
-            if (!AudioSystem.isBluetoothDevice(di.mDeviceType)
+            if (!isBluetoothDevice(di.mDeviceType)
                     || processedAddresses.contains(di.mDeviceAddress)) {
                 continue;
             }
@@ -1743,7 +1790,7 @@
                         + di.mDeviceAddress + ", preferredProfiles: " + preferredProfiles);
             }
             for (DeviceInfo di2 : mConnectedDevices.values()) {
-                if (!AudioSystem.isBluetoothDevice(di2.mDeviceType)
+                if (!isBluetoothDevice(di2.mDeviceType)
                         || !di.mDeviceAddress.equals(di2.mDeviceAddress)) {
                     continue;
                 }
@@ -2359,6 +2406,40 @@
         }
     }
 
+    /*package*/ String getDeviceSettings() {
+        int deviceCatalogSize = 0;
+        synchronized (mDeviceInventoryLock) {
+            deviceCatalogSize = mDeviceInventory.size();
+        }
+        final StringBuilder settingsBuilder = new StringBuilder(
+                deviceCatalogSize * AdiDeviceState.getPeristedMaxSize());
+
+        synchronized (mDeviceInventoryLock) {
+            for (int i = 0; i < mDeviceInventory.size(); i++) {
+                settingsBuilder.append(mDeviceInventory.get(i).toPersistableString());
+                if (i != mDeviceInventory.size() - 1) {
+                    settingsBuilder.append(SETTING_DEVICE_SEPARATOR_CHAR);
+                }
+            }
+        }
+        return settingsBuilder.toString();
+    }
+
+    /*package*/ void setDeviceSettings(String settings) {
+        clearDeviceInventory();
+        String[] devSettings = TextUtils.split(Objects.requireNonNull(settings),
+                SETTING_DEVICE_SEPARATOR);
+        // small list, not worth overhead of Arrays.stream(devSettings)
+        for (String setting : devSettings) {
+            AdiDeviceState devState = AdiDeviceState.fromPersistedString(setting);
+            // Note if the device is not compatible with spatialization mode or the device
+            // type is not canonical, it will be ignored in {@link SpatializerHelper}.
+            if (devState != null) {
+                addDeviceStateToInventory(devState);
+            }
+        }
+    }
+
     //----------------------------------------------------------
     // For tests only
 
diff --git a/services/core/java/com/android/server/audio/AudioService.java b/services/core/java/com/android/server/audio/AudioService.java
index f313e16..71424b1 100644
--- a/services/core/java/com/android/server/audio/AudioService.java
+++ b/services/core/java/com/android/server/audio/AudioService.java
@@ -382,7 +382,6 @@
     private static final int MSG_DISPATCH_AUDIO_MODE = 40;
     private static final int MSG_ROUTING_UPDATED = 41;
     private static final int MSG_INIT_HEADTRACKING_SENSORS = 42;
-    private static final int MSG_PERSIST_SPATIAL_AUDIO_DEVICE_SETTINGS = 43;
     private static final int MSG_ADD_ASSISTANT_SERVICE_UID = 44;
     private static final int MSG_REMOVE_ASSISTANT_SERVICE_UID = 45;
     private static final int MSG_UPDATE_ACTIVE_ASSISTANT_SERVICE_UID = 46;
@@ -1022,6 +1021,8 @@
         mAudioPolicy = audioPolicy;
         mPlatformType = AudioSystem.getPlatformType(context);
 
+        mDeviceBroker = new AudioDeviceBroker(mContext, this, mAudioSystem);
+
         mIsSingleVolume = AudioSystem.isSingleVolume(context);
 
         mUserManagerInternal = LocalServices.getService(UserManagerInternal.class);
@@ -1034,13 +1035,14 @@
 
         mSfxHelper = new SoundEffectsHelper(mContext, playerBase -> ignorePlayerLogs(playerBase));
 
-        final boolean binauralEnabledDefault = SystemProperties.getBoolean(
+        boolean binauralEnabledDefault = SystemProperties.getBoolean(
                 "ro.audio.spatializer_binaural_enabled_default", true);
-        final boolean transauralEnabledDefault = SystemProperties.getBoolean(
+        boolean transauralEnabledDefault = SystemProperties.getBoolean(
                 "ro.audio.spatializer_transaural_enabled_default", true);
-        final boolean headTrackingEnabledDefault = mContext.getResources().getBoolean(
+        boolean headTrackingEnabledDefault = mContext.getResources().getBoolean(
                 com.android.internal.R.bool.config_spatial_audio_head_tracking_enabled_default);
-        mSpatializerHelper = new SpatializerHelper(this, mAudioSystem,
+
+        mSpatializerHelper = new SpatializerHelper(this, mAudioSystem, mDeviceBroker,
                 binauralEnabledDefault, transauralEnabledDefault, headTrackingEnabledDefault);
 
         mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
@@ -1208,8 +1210,6 @@
         mUseFixedVolume = mContext.getResources().getBoolean(
                 com.android.internal.R.bool.config_useFixedVolume);
 
-        mDeviceBroker = new AudioDeviceBroker(mContext, this, mAudioSystem);
-
         mRecordMonitor = new RecordingActivityMonitor(mContext);
         mRecordMonitor.registerRecordingCallback(mVoiceRecordingActivityMonitor, true);
 
@@ -6573,6 +6573,10 @@
         return mContentResolver;
     }
 
+    /*package*/ SettingsAdapter getSettings() {
+        return mSettings;
+    }
+
     ///////////////////////////////////////////////////////////////////////////
     // Internal methods
     ///////////////////////////////////////////////////////////////////////////
@@ -9215,10 +9219,6 @@
                     mSpatializerHelper.onInitSensors();
                     break;
 
-                case MSG_PERSIST_SPATIAL_AUDIO_DEVICE_SETTINGS:
-                    onPersistSpatialAudioDeviceSettings();
-                    break;
-
                 case MSG_RESET_SPATIALIZER:
                     mSpatializerHelper.reset(/* featureEnabled */ mHasSpatializerEffect);
                     break;
@@ -10275,41 +10275,11 @@
     }
 
     void onInitSpatializer() {
-        final String settings = mSettings.getSecureStringForUser(mContentResolver,
-                Settings.Secure.SPATIAL_AUDIO_ENABLED, UserHandle.USER_CURRENT);
-        if (settings == null) {
-            Log.e(TAG, "error reading spatial audio device settings");
-        }
-        mSpatializerHelper.init(/*effectExpected*/ mHasSpatializerEffect, settings);
+        mDeviceBroker.onReadAudioDeviceSettings();
+        mSpatializerHelper.init(/*effectExpected*/ mHasSpatializerEffect);
         mSpatializerHelper.setFeatureEnabled(mHasSpatializerEffect);
     }
 
-    /**
-     * post a message to persist the spatial audio device settings.
-     * Message is delayed by 1s on purpose in case of successive changes in quick succession (at
-     * init time for instance)
-     * Note this method is made public to work around a Mockito bug where it needs to be public
-     * in order to be mocked by a test a the same package
-     * (see https://code.google.com/archive/p/mockito/issues/127)
-     */
-    public void persistSpatialAudioDeviceSettings() {
-        sendMsg(mAudioHandler,
-                MSG_PERSIST_SPATIAL_AUDIO_DEVICE_SETTINGS,
-                SENDMSG_REPLACE, /*arg1*/ 0, /*arg2*/ 0, TAG,
-                /*delay*/ 1000);
-    }
-
-    void onPersistSpatialAudioDeviceSettings() {
-        final String settings = mSpatializerHelper.getSADeviceSettings();
-        Log.v(TAG, "saving spatial audio device settings: " + settings);
-        boolean res = mSettings.putSecureStringForUser(mContentResolver,
-                Settings.Secure.SPATIAL_AUDIO_ENABLED,
-                settings, UserHandle.USER_CURRENT);
-        if (!res) {
-            Log.e(TAG, "error saving spatial audio device settings: " + settings);
-        }
-    }
-
     //==========================================================================================
 
     // camera sound is forced if any of the resources corresponding to one active SIM
diff --git a/services/core/java/com/android/server/audio/SpatializerHelper.java b/services/core/java/com/android/server/audio/SpatializerHelper.java
index 462c938..969dd60 100644
--- a/services/core/java/com/android/server/audio/SpatializerHelper.java
+++ b/services/core/java/com/android/server/audio/SpatializerHelper.java
@@ -16,6 +16,8 @@
 
 package com.android.server.audio;
 
+import static android.media.AudioSystem.isBluetoothDevice;
+
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.Context;
@@ -47,13 +49,13 @@
 import android.util.SparseIntArray;
 
 import com.android.internal.annotations.GuardedBy;
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.server.utils.EventLogger;
 
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
-import java.util.Objects;
 import java.util.UUID;
 
 /**
@@ -73,11 +75,12 @@
 
     private final @NonNull AudioSystemAdapter mASA;
     private final @NonNull AudioService mAudioService;
+    private final @NonNull AudioDeviceBroker mDeviceBroker;
     private @Nullable SensorManager mSensorManager;
 
     //------------------------------------------------------------
 
-    private static final SparseIntArray SPAT_MODE_FOR_DEVICE_TYPE = new SparseIntArray(14) {
+    /*package*/ static final SparseIntArray SPAT_MODE_FOR_DEVICE_TYPE = new SparseIntArray(14) {
         {
             append(AudioDeviceInfo.TYPE_BUILTIN_SPEAKER, SpatializationMode.SPATIALIZER_TRANSAURAL);
             append(AudioDeviceInfo.TYPE_WIRED_HEADSET, SpatializationMode.SPATIALIZER_BINAURAL);
@@ -98,13 +101,6 @@
         }
     };
 
-    private static final int[] WIRELESS_TYPES = { AudioDeviceInfo.TYPE_BLUETOOTH_SCO,
-            AudioDeviceInfo.TYPE_BLUETOOTH_A2DP,
-            AudioDeviceInfo.TYPE_BLE_HEADSET,
-            AudioDeviceInfo.TYPE_BLE_SPEAKER,
-            AudioDeviceInfo.TYPE_BLE_BROADCAST
-    };
-
     // Spatializer state machine
     /*package*/ static final int STATE_UNINITIALIZED = 0;
     /*package*/ static final int STATE_NOT_SUPPORTED = 1;
@@ -114,10 +110,15 @@
     /*package*/ static final int STATE_DISABLED_AVAILABLE = 6;
     private int mState = STATE_UNINITIALIZED;
 
+    @VisibleForTesting boolean mBinauralEnabledDefault;
+    @VisibleForTesting boolean mTransauralEnabledDefault;
+    @VisibleForTesting boolean mHeadTrackingEnabledDefault;
+
     private boolean mFeatureEnabled = false;
     /** current level as reported by native Spatializer in callback */
     private int mSpatLevel = Spatializer.SPATIALIZER_IMMERSIVE_LEVEL_NONE;
     private int mCapableSpatLevel = Spatializer.SPATIALIZER_IMMERSIVE_LEVEL_NONE;
+
     private boolean mTransauralSupported = false;
     private boolean mBinauralSupported = false;
     private boolean mIsHeadTrackingSupported = false;
@@ -160,31 +161,21 @@
      */
     private final ArrayList<Integer> mSACapableDeviceTypes = new ArrayList<>(0);
 
-    /**
-     * List of devices where Spatial Audio is possible. Each device can be enabled or disabled
-     * (== user choice to use or not)
-     */
-    @GuardedBy("this")
-    private final ArrayList<SADeviceState> mSADevices = new ArrayList<>(0);
-
     //------------------------------------------------------
     // initialization
-    @SuppressWarnings("StaticAssignmentInConstructor")
     SpatializerHelper(@NonNull AudioService mother, @NonNull AudioSystemAdapter asa,
-            boolean binauralEnabledDefault,
-            boolean transauralEnabledDefault,
-            boolean headTrackingEnabledDefault) {
+            @NonNull AudioDeviceBroker deviceBroker, boolean binauralEnabledDefault,
+            boolean transauralEnabledDefault, boolean headTrackingEnabledDefault) {
         mAudioService = mother;
         mASA = asa;
-        // "StaticAssignmentInConstructor" warning is suppressed as the SpatializerHelper being
-        // constructed here is the factory for SADeviceState, thus SADeviceState and its
-        // private static field sHeadTrackingEnabledDefault should never be accessed directly.
-        SADeviceState.sBinauralEnabledDefault = binauralEnabledDefault;
-        SADeviceState.sTransauralEnabledDefault = transauralEnabledDefault;
-        SADeviceState.sHeadTrackingEnabledDefault = headTrackingEnabledDefault;
+        mDeviceBroker = deviceBroker;
+
+        mBinauralEnabledDefault = binauralEnabledDefault;
+        mTransauralEnabledDefault = transauralEnabledDefault;
+        mHeadTrackingEnabledDefault = headTrackingEnabledDefault;
     }
 
-    synchronized void init(boolean effectExpected, @Nullable String settings) {
+    synchronized void init(boolean effectExpected) {
         loglogi("init effectExpected=" + effectExpected);
         if (!effectExpected) {
             loglogi("init(): setting state to STATE_NOT_SUPPORTED due to effect not expected");
@@ -288,10 +279,11 @@
                 }
             }
 
-            // When initialized from AudioService, the settings string will be non-null.
-            // Saved settings need to be applied after spatialization support is initialized above.
-            if (settings != null) {
-                setSADeviceSettings(settings);
+            // Log the saved device states that are compatible with SA
+            for (AdiDeviceState deviceState : mDeviceBroker.getImmutableDeviceInventory()) {
+                if (isSADevice(deviceState)) {
+                    logDeviceState(deviceState, "setSADeviceSettings");
+                }
             }
 
             // for both transaural / binaural, we are not forcing enablement as the init() method
@@ -331,7 +323,7 @@
         mState = STATE_UNINITIALIZED;
         mSpatLevel = Spatializer.SPATIALIZER_IMMERSIVE_LEVEL_NONE;
         mActualHeadTrackingMode = Spatializer.HEAD_TRACKING_MODE_UNSUPPORTED;
-        init(true, null /* settings */);
+        init(/*effectExpected=*/true);
         setSpatializerEnabledInt(featureEnabled);
     }
 
@@ -372,7 +364,7 @@
         final AudioDeviceAttributes currentDevice = sRoutingDevices.get(0);
 
         // is media routed to a new device?
-        if (isWireless(currentDevice.getType())) {
+        if (isBluetoothDevice(currentDevice.getInternalType())) {
             addWirelessDeviceIfNew(currentDevice);
         }
 
@@ -520,8 +512,8 @@
     synchronized @NonNull List<AudioDeviceAttributes> getCompatibleAudioDevices() {
         // build unionOf(mCompatibleAudioDevices, mEnabledDevice) - mDisabledAudioDevices
         ArrayList<AudioDeviceAttributes> compatList = new ArrayList<>();
-        for (SADeviceState deviceState : mSADevices) {
-            if (deviceState.mEnabled) {
+        for (AdiDeviceState deviceState : mDeviceBroker.getImmutableDeviceInventory()) {
+            if (deviceState.isSAEnabled() && isSADevice(deviceState)) {
                 compatList.add(deviceState.getAudioDeviceAttributes());
             }
         }
@@ -548,31 +540,50 @@
             return;
         }
         loglogi("addCompatibleAudioDevice: dev=" + ada);
-        final SADeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
-        SADeviceState deviceUpdated = null; // non-null on update.
+        final AdiDeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
+        initSAState(deviceState);
+        AdiDeviceState updatedDevice = null; // non-null on update.
         if (deviceState != null) {
-            if (forceEnable && !deviceState.mEnabled) {
-                deviceUpdated = deviceState;
-                deviceUpdated.mEnabled = true;
+            if (forceEnable && !deviceState.isSAEnabled()) {
+                updatedDevice = deviceState;
+                updatedDevice.setSAEnabled(true);
             }
         } else {
             // When adding, force the device type to be a canonical one.
-            final int canonicalDeviceType = getCanonicalDeviceType(ada.getType());
+            final int canonicalDeviceType = getCanonicalDeviceType(ada.getType(),
+                    ada.getInternalType());
             if (canonicalDeviceType == AudioDeviceInfo.TYPE_UNKNOWN) {
                 Log.e(TAG, "addCompatibleAudioDevice with incompatible AudioDeviceAttributes "
                         + ada);
                 return;
             }
-            deviceUpdated = new SADeviceState(canonicalDeviceType, ada.getAddress());
-            mSADevices.add(deviceUpdated);
+            updatedDevice = new AdiDeviceState(canonicalDeviceType, ada.getInternalType(),
+                    ada.getAddress());
+            initSAState(updatedDevice);
+            mDeviceBroker.addDeviceStateToInventory(updatedDevice);
         }
-        if (deviceUpdated != null) {
+        if (updatedDevice != null) {
             onRoutingUpdated();
-            mAudioService.persistSpatialAudioDeviceSettings();
-            logDeviceState(deviceUpdated, "addCompatibleAudioDevice");
+            mDeviceBroker.persistAudioDeviceSettings();
+            logDeviceState(updatedDevice, "addCompatibleAudioDevice");
         }
     }
 
+    private void initSAState(AdiDeviceState device) {
+        if (device == null) {
+            return;
+        }
+
+        int spatMode = SPAT_MODE_FOR_DEVICE_TYPE.get(device.getDeviceType(),
+                Integer.MIN_VALUE);
+        device.setSAEnabled(spatMode == SpatializationMode.SPATIALIZER_BINAURAL
+                ? mBinauralEnabledDefault
+                : spatMode == SpatializationMode.SPATIALIZER_TRANSAURAL
+                        ? mTransauralEnabledDefault
+                        : false);
+        device.setHeadTrackerEnabled(mHeadTrackingEnabledDefault);
+    }
+
     private static final String METRICS_DEVICE_PREFIX = "audio.spatializer.device.";
 
     // Device logging is accomplished in the Java Audio Service level.
@@ -580,29 +591,30 @@
     //
     // There may be different devices with the same device type (aliasing).
     // We always send the full device state info on each change.
-    private void logDeviceState(SADeviceState deviceState, String event) {
+    static void logDeviceState(AdiDeviceState deviceState, String event) {
         final int deviceType = AudioDeviceInfo.convertDeviceTypeToInternalDevice(
-                deviceState.mDeviceType);
+                deviceState.getDeviceType());
         final String deviceName = AudioSystem.getDeviceName(deviceType);
         new MediaMetrics.Item(METRICS_DEVICE_PREFIX + deviceName)
-            .set(MediaMetrics.Property.ADDRESS, deviceState.mDeviceAddress)
-            .set(MediaMetrics.Property.ENABLED, deviceState.mEnabled ? "true" : "false")
-            .set(MediaMetrics.Property.EVENT, TextUtils.emptyIfNull(event))
-            .set(MediaMetrics.Property.HAS_HEAD_TRACKER,
-                    deviceState.mHasHeadTracker ? "true" : "false") // this may be updated later.
-            .set(MediaMetrics.Property.HEAD_TRACKER_ENABLED,
-                    deviceState.mHeadTrackerEnabled ? "true" : "false")
-            .record();
+                .set(MediaMetrics.Property.ADDRESS, deviceState.getDeviceAddress())
+                .set(MediaMetrics.Property.ENABLED, deviceState.isSAEnabled() ? "true" : "false")
+                .set(MediaMetrics.Property.EVENT, TextUtils.emptyIfNull(event))
+                .set(MediaMetrics.Property.HAS_HEAD_TRACKER,
+                        deviceState.hasHeadTracker() ? "true"
+                                : "false") // this may be updated later.
+                .set(MediaMetrics.Property.HEAD_TRACKER_ENABLED,
+                        deviceState.isHeadTrackerEnabled() ? "true" : "false")
+                .record();
     }
 
     synchronized void removeCompatibleAudioDevice(@NonNull AudioDeviceAttributes ada) {
         loglogi("removeCompatibleAudioDevice: dev=" + ada);
 
-        final SADeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
-        if (deviceState != null && deviceState.mEnabled) {
-            deviceState.mEnabled = false;
+        final AdiDeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
+        if (deviceState != null && deviceState.isSAEnabled()) {
+            deviceState.setSAEnabled(false);
             onRoutingUpdated();
-            mAudioService.persistSpatialAudioDeviceSettings();
+            mDeviceBroker.persistAudioDeviceSettings();
             logDeviceState(deviceState, "removeCompatibleAudioDevice");
         }
     }
@@ -611,8 +623,9 @@
      * Returns a possibly aliased device type which is used
      * for spatial audio settings (or TYPE_UNKNOWN  if it doesn't exist).
      */
-    private static @AudioDeviceInfo.AudioDeviceType int getCanonicalDeviceType(int deviceType) {
-        if (isWireless(deviceType)) return deviceType;
+    @AudioDeviceInfo.AudioDeviceType
+    private static int getCanonicalDeviceType(int deviceType, int internalDeviceType) {
+        if (isBluetoothDevice(internalDeviceType)) return deviceType;
 
         final int spatMode = SPAT_MODE_FOR_DEVICE_TYPE.get(deviceType, Integer.MIN_VALUE);
         if (spatMode == SpatializationMode.SPATIALIZER_TRANSAURAL) {
@@ -629,18 +642,9 @@
      */
     @GuardedBy("this")
     @Nullable
-    private SADeviceState findDeviceStateForAudioDeviceAttributes(AudioDeviceAttributes ada) {
-        final int deviceType = ada.getType();
-        final boolean isWireless = isWireless(deviceType);
-        final int canonicalDeviceType = getCanonicalDeviceType(deviceType);
-
-        for (SADeviceState deviceState : mSADevices) {
-            if (deviceState.mDeviceType == canonicalDeviceType
-                    && (!isWireless || ada.getAddress().equals(deviceState.mDeviceAddress))) {
-                return deviceState;
-            }
-        }
-        return null;
+    private AdiDeviceState findDeviceStateForAudioDeviceAttributes(AudioDeviceAttributes ada) {
+        return mDeviceBroker.findDeviceStateForAudioDeviceAttributes(ada,
+                getCanonicalDeviceType(ada.getType(), ada.getInternalType()));
     }
 
     /**
@@ -662,14 +666,14 @@
             Log.e(TAG, "no spatialization mode found for device type:" + deviceType);
             return new Pair<>(false, false);
         }
-        final SADeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
+        final AdiDeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
         if (deviceState == null) {
             // no matching device state?
             Log.i(TAG, "no spatialization device state found for Spatial Audio device:" + ada);
             return new Pair<>(false, false);
         }
         // found the matching device state.
-        return new Pair<>(deviceState.mEnabled, true /* available */);
+        return new Pair<>(deviceState.isSAEnabled(), true /* available */);
     }
 
     private synchronized void addWirelessDeviceIfNew(@NonNull AudioDeviceAttributes ada) {
@@ -678,16 +682,19 @@
         }
         if (findDeviceStateForAudioDeviceAttributes(ada) == null) {
             // wireless device types should be canonical, but we translate to be sure.
-            final int canonicalDeviceType = getCanonicalDeviceType((ada.getType()));
+            final int canonicalDeviceType = getCanonicalDeviceType(ada.getType(),
+                    ada.getInternalType());
             if (canonicalDeviceType == AudioDeviceInfo.TYPE_UNKNOWN) {
                 Log.e(TAG, "addWirelessDeviceIfNew with incompatible AudioDeviceAttributes "
                         + ada);
                 return;
             }
-            final SADeviceState deviceState =
-                    new SADeviceState(canonicalDeviceType, ada.getAddress());
-            mSADevices.add(deviceState);
-            mAudioService.persistSpatialAudioDeviceSettings();
+            final AdiDeviceState deviceState =
+                    new AdiDeviceState(canonicalDeviceType, ada.getInternalType(),
+                            ada.getAddress());
+            initSAState(deviceState);
+            mDeviceBroker.addDeviceStateToInventory(deviceState);
+            mDeviceBroker.persistAudioDeviceSettings();
             logDeviceState(deviceState, "addWirelessDeviceIfNew"); // may be updated later.
         }
     }
@@ -756,6 +763,12 @@
         return false;
     }
 
+    private boolean isSADevice(AdiDeviceState deviceState) {
+        return deviceState.getDeviceType() == getCanonicalDeviceType(deviceState.getDeviceType(),
+                deviceState.getInternalDeviceType()) && isDeviceCompatibleWithSpatializationModes(
+                deviceState.getAudioDeviceAttributes());
+    }
+
     synchronized void setFeatureEnabled(boolean enabled) {
         loglogi("setFeatureEnabled(" + enabled + ") was featureEnabled:" + mFeatureEnabled);
         if (mFeatureEnabled == enabled) {
@@ -768,7 +781,7 @@
                 return;
             }
             if (mState == STATE_UNINITIALIZED) {
-                init(true, null /* settings */);
+                init(true);
             }
             setSpatializerEnabledInt(true);
         } else {
@@ -1137,16 +1150,16 @@
             Log.v(TAG, "no headtracking support, ignoring setHeadTrackerEnabled to " + enabled
                     + " for " + ada);
         }
-        final SADeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
+        final AdiDeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
         if (deviceState == null) return;
-        if (!deviceState.mHasHeadTracker) {
+        if (!deviceState.hasHeadTracker()) {
             Log.e(TAG, "Called setHeadTrackerEnabled enabled:" + enabled
                     + " device:" + ada + " on a device without headtracker");
             return;
         }
         Log.i(TAG, "setHeadTrackerEnabled enabled:" + enabled + " device:" + ada);
-        deviceState.mHeadTrackerEnabled = enabled;
-        mAudioService.persistSpatialAudioDeviceSettings();
+        deviceState.setHeadTrackerEnabled(enabled);
+        mDeviceBroker.persistAudioDeviceSettings();
         logDeviceState(deviceState, "setHeadTrackerEnabled");
 
         // check current routing to see if it affects the headtracking mode
@@ -1170,8 +1183,8 @@
             Log.v(TAG, "no headtracking support, hasHeadTracker always false for " + ada);
             return false;
         }
-        final SADeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
-        return deviceState != null && deviceState.mHasHeadTracker;
+        final AdiDeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
+        return deviceState != null && deviceState.hasHeadTracker();
     }
 
     /**
@@ -1184,14 +1197,14 @@
             Log.v(TAG, "no headtracking support, setHasHeadTracker always false for " + ada);
             return false;
         }
-        final SADeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
+        final AdiDeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
         if (deviceState != null) {
-            if (!deviceState.mHasHeadTracker) {
-                deviceState.mHasHeadTracker = true;
-                mAudioService.persistSpatialAudioDeviceSettings();
+            if (!deviceState.hasHeadTracker()) {
+                deviceState.setHasHeadTracker(true);
+                mDeviceBroker.persistAudioDeviceSettings();
                 logDeviceState(deviceState, "setHasHeadTracker");
             }
-            return deviceState.mHeadTrackerEnabled;
+            return deviceState.isHeadTrackerEnabled();
         }
         Log.e(TAG, "setHasHeadTracker: device not found for:" + ada);
         return false;
@@ -1202,9 +1215,9 @@
             Log.v(TAG, "no headtracking support, isHeadTrackerEnabled always false for " + ada);
             return false;
         }
-        final SADeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
+        final AdiDeviceState deviceState = findDeviceStateForAudioDeviceAttributes(ada);
         return deviceState != null
-                && deviceState.mHasHeadTracker && deviceState.mHeadTrackerEnabled;
+                && deviceState.hasHeadTracker() && deviceState.isHeadTrackerEnabled();
     }
 
     synchronized boolean isHeadTrackerAvailable() {
@@ -1543,144 +1556,6 @@
         pw.println("\tsupports binaural:" + mBinauralSupported + " / transaural:"
                 + mTransauralSupported);
         pw.println("\tmSpatOutput:" + mSpatOutput);
-        pw.println("\tdevices:");
-        for (SADeviceState device : mSADevices) {
-            pw.println("\t\t" + device);
-        }
-    }
-
-    /*package*/ static final class SADeviceState {
-        private static boolean sBinauralEnabledDefault = true;
-        private static boolean sTransauralEnabledDefault = true;
-        private static boolean sHeadTrackingEnabledDefault = false;
-        final @AudioDeviceInfo.AudioDeviceType int mDeviceType;
-        final @NonNull String mDeviceAddress;
-        boolean mEnabled;
-        boolean mHasHeadTracker = false;
-        boolean mHeadTrackerEnabled;
-        static final String SETTING_FIELD_SEPARATOR = ",";
-        static final String SETTING_DEVICE_SEPARATOR_CHAR = "|";
-        static final String SETTING_DEVICE_SEPARATOR = "\\|";
-
-        /**
-         * Constructor
-         * @param deviceType
-         * @param address must be non-null for wireless devices
-         * @throws NullPointerException if a null address is passed for a wireless device
-         */
-        SADeviceState(@AudioDeviceInfo.AudioDeviceType int deviceType, @Nullable String address) {
-            mDeviceType = deviceType;
-            mDeviceAddress = isWireless(deviceType) ? Objects.requireNonNull(address) : "";
-            final int spatMode = SPAT_MODE_FOR_DEVICE_TYPE.get(deviceType, Integer.MIN_VALUE);
-            mEnabled = spatMode == SpatializationMode.SPATIALIZER_BINAURAL
-                    ? sBinauralEnabledDefault
-                    : spatMode == SpatializationMode.SPATIALIZER_TRANSAURAL
-                            ? sTransauralEnabledDefault
-                            : false;
-            mHeadTrackerEnabled = sHeadTrackingEnabledDefault;
-        }
-
-        @Override
-        public boolean equals(Object obj) {
-            if (this == obj) {
-                return true;
-            }
-            if (obj == null) {
-                return false;
-            }
-            // type check and cast
-            if (getClass() != obj.getClass()) {
-                return false;
-            }
-            final SADeviceState sads = (SADeviceState) obj;
-            return mDeviceType == sads.mDeviceType
-                    && mDeviceAddress.equals(sads.mDeviceAddress)
-                    && mEnabled == sads.mEnabled
-                    && mHasHeadTracker == sads.mHasHeadTracker
-                    && mHeadTrackerEnabled == sads.mHeadTrackerEnabled;
-        }
-
-        @Override
-        public int hashCode() {
-            return Objects.hash(mDeviceType, mDeviceAddress, mEnabled, mHasHeadTracker,
-                    mHeadTrackerEnabled);
-        }
-
-        @Override
-        public String toString() {
-            return "type: " + mDeviceType + " addr: " + mDeviceAddress + " enabled: " + mEnabled
-                    + " HT: " + mHasHeadTracker + " HTenabled: " + mHeadTrackerEnabled;
-        }
-
-        String toPersistableString() {
-            return (new StringBuilder().append(mDeviceType)
-                    .append(SETTING_FIELD_SEPARATOR).append(mDeviceAddress)
-                    .append(SETTING_FIELD_SEPARATOR).append(mEnabled ? "1" : "0")
-                    .append(SETTING_FIELD_SEPARATOR).append(mHasHeadTracker ? "1" : "0")
-                    .append(SETTING_FIELD_SEPARATOR).append(mHeadTrackerEnabled ? "1" : "0")
-                    .toString());
-        }
-
-        static @Nullable SADeviceState fromPersistedString(@Nullable String persistedString) {
-            if (persistedString == null) {
-                return null;
-            }
-            if (persistedString.isEmpty()) {
-                return null;
-            }
-            String[] fields = TextUtils.split(persistedString, SETTING_FIELD_SEPARATOR);
-            if (fields.length != 5) {
-                // expecting all fields, fewer may mean corruption, ignore those settings
-                return null;
-            }
-            try {
-                final int deviceType = Integer.parseInt(fields[0]);
-                final SADeviceState deviceState = new SADeviceState(deviceType, fields[1]);
-                deviceState.mEnabled = Integer.parseInt(fields[2]) == 1;
-                deviceState.mHasHeadTracker = Integer.parseInt(fields[3]) == 1;
-                deviceState.mHeadTrackerEnabled = Integer.parseInt(fields[4]) == 1;
-                return deviceState;
-            } catch (NumberFormatException e) {
-                Log.e(TAG, "unable to parse setting for SADeviceState: " + persistedString, e);
-                return null;
-            }
-        }
-
-        public AudioDeviceAttributes getAudioDeviceAttributes() {
-            return new AudioDeviceAttributes(AudioDeviceAttributes.ROLE_OUTPUT,
-                    mDeviceType, mDeviceAddress == null ? "" : mDeviceAddress);
-        }
-
-    }
-
-    /*package*/ synchronized String getSADeviceSettings() {
-        // expected max size of each String for each SADeviceState is 25 (accounting for separator)
-        final StringBuilder settingsBuilder = new StringBuilder(mSADevices.size() * 25);
-        for (int i = 0; i < mSADevices.size(); i++) {
-            settingsBuilder.append(mSADevices.get(i).toPersistableString());
-            if (i != mSADevices.size() - 1) {
-                settingsBuilder.append(SADeviceState.SETTING_DEVICE_SEPARATOR_CHAR);
-            }
-        }
-        return settingsBuilder.toString();
-    }
-
-    /*package*/ synchronized void setSADeviceSettings(@NonNull String persistedSettings) {
-        String[] devSettings = TextUtils.split(Objects.requireNonNull(persistedSettings),
-                SADeviceState.SETTING_DEVICE_SEPARATOR);
-        // small list, not worth overhead of Arrays.stream(devSettings)
-        for (String setting : devSettings) {
-            SADeviceState devState = SADeviceState.fromPersistedString(setting);
-            // Note if the device is not compatible with spatialization mode
-            // or the device type is not canonical, it is ignored.
-            if (devState != null
-                    && devState.mDeviceType == getCanonicalDeviceType(devState.mDeviceType)
-                    && isDeviceCompatibleWithSpatializationModes(
-                            devState.getAudioDeviceAttributes())) {
-                mSADevices.add(devState);
-                logDeviceState(devState, "setSADeviceSettings");
-            }
-        }
     }
 
     private static String spatStateString(int state) {
@@ -1702,15 +1577,6 @@
         }
     }
 
-    private static boolean isWireless(@AudioDeviceInfo.AudioDeviceType int deviceType) {
-        for (int type : WIRELESS_TYPES) {
-            if (type == deviceType) {
-                return true;
-            }
-        }
-        return false;
-    }
-
     private int getHeadSensorHandleUpdateTracker() {
         int headHandle = -1;
         if (sRoutingDevices.isEmpty()) {
@@ -1780,11 +1646,6 @@
 
     //------------------------------------------------
     // for testing purposes only
-
-    /*package*/ void clearSADevices() {
-        mSADevices.clear();
-    }
-
     /*package*/ synchronized void forceStateForTest(int state) {
         mState = state;
     }
diff --git a/services/tests/servicestests/src/com/android/server/audio/AudioDeviceBrokerTest.java b/services/tests/servicestests/src/com/android/server/audio/AudioDeviceBrokerTest.java
index 31599ee..aba24fb 100644
--- a/services/tests/servicestests/src/com/android/server/audio/AudioDeviceBrokerTest.java
+++ b/services/tests/servicestests/src/com/android/server/audio/AudioDeviceBrokerTest.java
@@ -29,13 +29,14 @@
 import android.content.Context;
 import android.content.Intent;
 import android.media.AudioDeviceAttributes;
+import android.media.AudioDeviceInfo;
 import android.media.AudioManager;
 import android.media.AudioSystem;
 import android.media.BluetoothProfileConnectionInfo;
 import android.util.Log;
 
-import androidx.test.InstrumentationRegistry;
 import androidx.test.filters.MediumTest;
+import androidx.test.platform.app.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.After;
@@ -54,7 +55,6 @@
     private static final String TAG = "AudioDeviceBrokerTest";
     private static final int MAX_MESSAGE_HANDLING_DELAY_MS = 100;
 
-    private Context mContext;
     // the actual class under test
     private AudioDeviceBroker mAudioDeviceBroker;
 
@@ -67,13 +67,13 @@
 
     @Before
     public void setUp() throws Exception {
-        mContext = InstrumentationRegistry.getTargetContext();
+        Context context = InstrumentationRegistry.getInstrumentation().getTargetContext();
 
         mMockAudioService = mock(AudioService.class);
         mSpyAudioSystem = spy(new NoOpAudioSystemAdapter());
         mSpyDevInventory = spy(new AudioDeviceInventory(mSpyAudioSystem));
         mSpySystemServer = spy(new NoOpSystemServerAdapter());
-        mAudioDeviceBroker = new AudioDeviceBroker(mContext, mMockAudioService, mSpyDevInventory,
+        mAudioDeviceBroker = new AudioDeviceBroker(context, mMockAudioService, mSpyDevInventory,
                 mSpySystemServer, mSpyAudioSystem);
         mSpyDevInventory.setDeviceBroker(mAudioDeviceBroker);
 
@@ -197,6 +197,37 @@
                 any(Intent.class));
     }
 
+    /**
+     * Test that constructing an AdiDeviceState instance requires a non-null address for a
+     * wireless type, but can take null for a non-wireless type;
+     * @throws Exception
+     */
+    @Test
+    public void testAdiDeviceStateNullAddressCtor() throws Exception {
+        try {
+            new AdiDeviceState(AudioDeviceInfo.TYPE_BUILTIN_SPEAKER,
+                    AudioManager.DEVICE_OUT_SPEAKER, null);
+            new AdiDeviceState(AudioDeviceInfo.TYPE_BLUETOOTH_A2DP,
+                    AudioManager.DEVICE_OUT_BLUETOOTH_A2DP, null);
+            Assert.fail();
+        } catch (NullPointerException e) { }
+    }
+
+    @Test
+    public void testAdiDeviceStateStringSerialization() throws Exception {
+        Log.i(TAG, "starting testAdiDeviceStateStringSerialization");
+        final AdiDeviceState devState = new AdiDeviceState(
+                AudioDeviceInfo.TYPE_BUILTIN_SPEAKER, AudioManager.DEVICE_OUT_SPEAKER, "bla");
+        devState.setHasHeadTracker(false);
+        devState.setHeadTrackerEnabled(false);
+        devState.setSAEnabled(true);
+        final String persistString = devState.toPersistableString();
+        final AdiDeviceState result = AdiDeviceState.fromPersistedString(persistString);
+        Log.i(TAG, "original:" + devState);
+        Log.i(TAG, "result  :" + result);
+        Assert.assertEquals(devState, result);
+    }
+
     private void doTestConnectionDisconnectionReconnection(int delayAfterDisconnection,
             boolean mockMediaPlayback, boolean guaranteeSingleConnection) throws Exception {
         when(mMockAudioService.getDeviceForStream(AudioManager.STREAM_MUSIC))
diff --git a/services/tests/servicestests/src/com/android/server/audio/SpatializerHelperTest.java b/services/tests/servicestests/src/com/android/server/audio/SpatializerHelperTest.java
index 3ad24de..ad09ef0 100644
--- a/services/tests/servicestests/src/com/android/server/audio/SpatializerHelperTest.java
+++ b/services/tests/servicestests/src/com/android/server/audio/SpatializerHelperTest.java
@@ -15,8 +15,6 @@
  */
 package com.android.server.audio;
 
-import com.android.server.audio.SpatializerHelper.SADeviceState;
-
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.Mockito.doNothing;
@@ -26,12 +24,12 @@
 
 import android.media.AudioAttributes;
 import android.media.AudioDeviceAttributes;
-import android.media.AudioDeviceInfo;
 import android.media.AudioFormat;
 import android.media.AudioSystem;
 import android.util.Log;
 
 import androidx.test.filters.MediumTest;
+import androidx.test.platform.app.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
 
 import org.junit.Assert;
@@ -55,72 +53,25 @@
 
     @Mock private AudioService mMockAudioService;
     @Spy private AudioSystemAdapter mSpyAudioSystem;
-    @Mock private AudioSystemAdapter mMockAudioSystem;
+    @Spy private AudioDeviceBroker mSpyDeviceBroker;
 
     @Before
     public void setUp() throws Exception {
         mMockAudioService = mock(AudioService.class);
-    }
 
-    /**
-     * Initializes mSpatHelper, the SpatizerHelper instance under test, to use the mock or spy
-     * AudioSystemAdapter
-     * @param useSpyAudioSystem true to use the spy adapter, mSpyAudioSystem, or false to use
-     *                          the mock adapter, mMockAudioSystem.
-     */
-    private void setUpSpatHelper(boolean useSpyAudioSystem) {
-        final AudioSystemAdapter asAdapter;
-        if (useSpyAudioSystem) {
-            mSpyAudioSystem = spy(new NoOpAudioSystemAdapter());
-            asAdapter = mSpyAudioSystem;
-            mMockAudioSystem = null;
-        } else {
-            mSpyAudioSystem = null;
-            mMockAudioSystem = mock(NoOpAudioSystemAdapter.class);
-            asAdapter = mMockAudioSystem;
-        }
-        mSpatHelper = new SpatializerHelper(mMockAudioService, asAdapter,
-                true /*binauralEnabledDefault*/,
-                true /*transauralEnabledDefault*/,
-                false /*headTrackingEnabledDefault*/);
-
-    }
-
-    /**
-     * Test that constructing an SADeviceState instance requires a non-null address for a
-     * wireless type, but can take null for a non-wireless type;
-     * @throws Exception
-     */
-    @Test
-    public void testSADeviceStateNullAddressCtor() throws Exception {
-        setUpSpatHelper(true /*useSpyAudioSystem*/);
-        try {
-            SADeviceState devState = new SADeviceState(AudioDeviceInfo.TYPE_BUILTIN_SPEAKER, null);
-            devState = new SADeviceState(AudioDeviceInfo.TYPE_BLUETOOTH_A2DP, null);
-            Assert.fail();
-        } catch (NullPointerException e) { }
+        mSpyAudioSystem = spy(new NoOpAudioSystemAdapter());
+        mSpyDeviceBroker = spy(
+                new AudioDeviceBroker(
+                        InstrumentationRegistry.getInstrumentation().getTargetContext(),
+                        mMockAudioService, mSpyAudioSystem));
+        mSpatHelper = new SpatializerHelper(mMockAudioService, mSpyAudioSystem,
+                mSpyDeviceBroker, /*binauralEnabledDefault=*/true, /*transauralEnabledDefault=*/
+                true, /*headTrackingEnabledDefault*/false);
     }
 
     @Test
-    public void testSADeviceStateStringSerialization() throws Exception {
-        Log.i(TAG, "starting testSADeviceStateStringSerialization");
-        setUpSpatHelper(true /*useSpyAudioSystem*/);
-        final SADeviceState devState = new SADeviceState(
-                AudioDeviceInfo.TYPE_BUILTIN_SPEAKER, "bla");
-        devState.mHasHeadTracker = false;
-        devState.mHeadTrackerEnabled = false;
-        devState.mEnabled = true;
-        final String persistString = devState.toPersistableString();
-        final SADeviceState result = SADeviceState.fromPersistedString(persistString);
-        Log.i(TAG, "original:" + devState);
-        Log.i(TAG, "result  :" + result);
-        Assert.assertEquals(devState, result);
-    }
-
-    @Test
-    public void testSADeviceSettings() throws Exception {
+    public void testAdiDeviceStateSettings() throws Exception {
         Log.i(TAG, "starting testSADeviceSettings");
-        setUpSpatHelper(true /*useSpyAudioSystem*/);
         final AudioDeviceAttributes dev1 =
                 new AudioDeviceAttributes(AudioSystem.DEVICE_OUT_SPEAKER, "");
         final AudioDeviceAttributes dev2 =
@@ -128,7 +79,7 @@
         final AudioDeviceAttributes dev3 =
                 new AudioDeviceAttributes(AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP, "R2:D2:bloop");
 
-        doNothing().when(mMockAudioService).persistSpatialAudioDeviceSettings();
+        doNothing().when(mSpyDeviceBroker).persistAudioDeviceSettings();
         mSpatHelper.initForTest(true /*binaural*/, true /*transaural*/);
 
         // test with single device
@@ -163,11 +114,11 @@
      * the original one.
      */
     private void checkAddSettings() throws Exception {
-        String settings = mSpatHelper.getSADeviceSettings();
+        String settings = mSpyDeviceBroker.getDeviceSettings();
         Log.i(TAG, "device settings: " + settings);
-        mSpatHelper.clearSADevices();
-        mSpatHelper.setSADeviceSettings(settings);
-        String settingsRestored = mSpatHelper.getSADeviceSettings();
+        mSpyDeviceBroker.clearDeviceInventory();
+        mSpyDeviceBroker.setDeviceSettings(settings);
+        String settingsRestored = mSpyDeviceBroker.getDeviceSettings();
         Log.i(TAG, "device settingsRestored: " + settingsRestored);
         Assert.assertEquals(settings, settingsRestored);
     }
@@ -179,7 +130,6 @@
     @Test
     public void testNoRoutingCanBeSpatialized() throws Exception {
         Log.i(TAG, "Starting testNoRoutingCanBeSpatialized");
-        setUpSpatHelper(false /*useSpyAudioSystem*/);
         mSpatHelper.forceStateForTest(SpatializerHelper.STATE_ENABLED_AVAILABLE);
 
         final ArrayList<AudioDeviceAttributes> emptyList = new ArrayList<>(0);
@@ -191,12 +141,12 @@
                 .setEncoding(AudioFormat.ENCODING_PCM_16BIT)
                 .setChannelMask(AudioFormat.CHANNEL_OUT_5POINT1).build();
 
-        when(mMockAudioSystem.getDevicesForAttributes(any(AudioAttributes.class), anyBoolean()))
+        when(mSpyAudioSystem.getDevicesForAttributes(any(AudioAttributes.class), anyBoolean()))
                 .thenReturn(emptyList);
         Assert.assertFalse("can be spatialized on empty routing",
                 mSpatHelper.canBeSpatialized(media, spatialFormat));
 
-        when(mMockAudioSystem.getDevicesForAttributes(any(AudioAttributes.class), anyBoolean()))
+        when(mSpyAudioSystem.getDevicesForAttributes(any(AudioAttributes.class), anyBoolean()))
                 .thenReturn(listWithNull);
         Assert.assertFalse("can be spatialized on null routing",
                 mSpatHelper.canBeSpatialized(media, spatialFormat));