BLE audio: support assigning volume at BLE device connection

Add support for associating an initial volume with a BLE
connection:
- add volume info to BluetoothProfileConnectionInfo in a new
BLE output factory method
- when handling device connection for BLE, also check if
volume information from the connection information is available.

Bug: 233975367
Test: atest frameworks/base/media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/unit/BluetoothProfileConnectionInfoTest.java
Change-Id: Ib54267727bc4d47e6999f2b84eab805f23c4955a

media/java/android/media/BluetoothProfileConnectionInfo.java

@@ -125,6 +125,21 @@ public final class BluetoothProfileConnectionInfo implements Parcelable {
             -1, isLeOutput);
     }
 
+    /**
+     * @hide
+     * Factory method for <code>BluetoothProfileConnectionInfo</code> for an LE output device
+     * @param suppressNoisyIntent if true the {@link AudioManager.ACTION_AUDIO_BECOMING_NOISY}
+     *     intent will not be sent.
+     * @param volume the volume index of the device, -1 if unknown or to be ignored
+     * @return an instance of BluetoothProfileConnectionInfo for the BLE output device that reflects
+     *     the given parameters
+     */
+    public static @NonNull BluetoothProfileConnectionInfo createLeAudioOutputInfo(
+            boolean suppressNoisyIntent, int volume) {
+        return new BluetoothProfileConnectionInfo(BluetoothProfile.LE_AUDIO, suppressNoisyIntent,
+                volume, /*isLeOutput*/ true);
+    }
+
     /**
      * @return The profile connection
      */

media/tests/MediaFrameworkTest/src/com/android/mediaframeworktest/unit/BluetoothProfileConnectionInfoTest.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 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.mediaframeworktest.unit;
+
+import static org.junit.Assert.assertEquals;
+
+import android.bluetooth.BluetoothProfile;
+import android.media.BluetoothProfileConnectionInfo;
+
+import androidx.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class BluetoothProfileConnectionInfoTest {
+
+    @Test
+    public void testCoverageLeAudioOutputVolume() {
+        final boolean supprNoisy = false;
+        final int volume = 1;
+        final BluetoothProfileConnectionInfo info = BluetoothProfileConnectionInfo
+                .createLeAudioOutputInfo(supprNoisy, volume);
+        assertEquals(info.getProfile(), BluetoothProfile.LE_AUDIO);
+        assertEquals(info.isSuppressNoisyIntent(), supprNoisy);
+        assertEquals(info.isLeOutput(), true);
+        assertEquals(info.getVolume(), volume);
+    }
+
+}

services/core/java/com/android/server/audio/AudioDeviceInventory.java

@@ -375,7 +375,8 @@ public class AudioDeviceInventory {
                         makeLeAudioDeviceUnavailable(address, btInfo.mAudioSystemDevice);
                     } else if (switchToAvailable) {
                         makeLeAudioDeviceAvailable(address, BtHelper.getName(btInfo.mDevice),
-                                streamType, btInfo.mAudioSystemDevice, "onSetBtActiveDevice");
+                                streamType, btInfo.mVolume, btInfo.mAudioSystemDevice,
+                                "onSetBtActiveDevice");
                     }
                     break;
                 default: throw new IllegalArgumentException("Invalid profile "
@@ -1159,8 +1160,8 @@ public class AudioDeviceInventory {
     }
 
     @GuardedBy("mDevicesLock")
-    private void makeLeAudioDeviceAvailable(String address, String name, int streamType, int device,
+    private void makeLeAudioDeviceAvailable(String address, String name, int streamType,
-            String eventSource) {
+            int volumeIndex, int device, String eventSource) {
         if (device != AudioSystem.DEVICE_NONE) {
             /* Audio Policy sees Le Audio similar to A2DP. Let's make sure
              * AUDIO_POLICY_FORCE_NO_BT_A2DP is not set
@@ -1181,7 +1182,9 @@ public class AudioDeviceInventory {
             return;
         }
 
-        final int leAudioVolIndex = mDeviceBroker.getVssVolumeForDevice(streamType, device);
+        final int leAudioVolIndex = (volumeIndex == -1)
+                ? mDeviceBroker.getVssVolumeForDevice(streamType, device)
+                : volumeIndex;
         final int maxIndex = mDeviceBroker.getMaxVssVolumeForStream(streamType);
         mDeviceBroker.postSetLeAudioVolumeIndex(leAudioVolIndex, maxIndex, streamType);
         mDeviceBroker.postApplyVolumeOnDevice(streamType, device, "makeLeAudioDeviceAvailable");