Merge "LE Audio: Implement QR code V2 for LEA broadcast" into udc-dev

2023-05-30 19:04:55 +00:00
parent 67ce9ee5e3 f615d76f99
commit 8da013de74
3 changed files with 443 additions and 41 deletions
--- a/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothBroadcastUtils.java
+++ b/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothBroadcastUtils.java
@@ -43,5 +43,5 @@ public final class BluetoothBroadcastUtils {
    /**
     * Bluetooth scheme.
     */
-    public static final String SCHEME_BT_BROADCAST_METADATA = "BT:BluetoothLeBroadcastMetadata:";
+    public static final String SCHEME_BT_BROADCAST_METADATA = "BT:";
 }
--- a/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt
+++ b/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt
@@ -15,23 +15,92 @@
 */
 package com.android.settingslib.bluetooth

+import android.annotation.TargetApi
+import android.bluetooth.BluetoothAdapter
+import android.bluetooth.BluetoothDevice
+import android.bluetooth.BluetoothLeAudioCodecConfigMetadata
+import android.bluetooth.BluetoothLeAudioContentMetadata
+import android.bluetooth.BluetoothLeBroadcastChannel
 import android.bluetooth.BluetoothLeBroadcastMetadata
-import android.os.Parcel
-import android.os.Parcelable
+import android.bluetooth.BluetoothLeBroadcastSubgroup
+import android.os.Build
 import android.util.Base64
 import android.util.Log
 import com.android.settingslib.bluetooth.BluetoothBroadcastUtils.SCHEME_BT_BROADCAST_METADATA

 object BluetoothLeBroadcastMetadataExt {
-    private const val TAG = "BluetoothLeBroadcastMetadataExt"
+    private const val TAG = "BtLeBroadcastMetadataExt"
+
+    // BluetoothLeBroadcastMetadata
+    private const val KEY_BT_QR_VER = "R"
+    private const val KEY_BT_ADDRESS_TYPE = "T"
+    private const val KEY_BT_DEVICE = "D"
+    private const val KEY_BT_ADVERTISING_SID = "AS"
+    private const val KEY_BT_BROADCAST_ID = "B"
+    private const val KEY_BT_BROADCAST_NAME = "BN"
+    private const val KEY_BT_PUBLIC_BROADCAST_DATA = "PM"
+    private const val KEY_BT_SYNC_INTERVAL = "SI"
+    private const val KEY_BT_BROADCAST_CODE = "C"
+    private const val KEY_BT_SUBGROUPS = "SG"
+    private const val KEY_BT_VENDOR_SPECIFIC = "V"
+    private const val KEY_BT_ANDROID_VERSION = "VN"
+
+    // Subgroup data
+    private const val KEY_BTSG_BIS_SYNC = "BS"
+    private const val KEY_BTSG_BIS_MASK = "BM"
+    private const val KEY_BTSG_AUDIO_CONTENT = "AC"
+
+    // Vendor specific data
+    private const val KEY_BTVSD_COMPANY_ID = "VI"
+    private const val KEY_BTVSD_VENDOR_DATA = "VD"
+
+    private const val DELIMITER_KEY_VALUE = ":"
+    private const val DELIMITER_BT_LEVEL_1 = ";"
+    private const val DELIMITER_BT_LEVEL_2 = ","
+
+    private const val SUFFIX_QR_CODE = ";;"
+
+    private const val ANDROID_VER = "U"
+    private const val QR_CODE_VER = 0x010000
+
+    // BT constants
+    private const val BIS_SYNC_MAX_CHANNEL = 32
+    private const val BIS_SYNC_NO_PREFERENCE = 0xFFFFFFFFu
+    private const val SUBGROUP_LC3_CODEC_ID = 0x6L

    /**
     * Converts [BluetoothLeBroadcastMetadata] to QR code string.
     *
-     * QR code string will prefix with "BT:BluetoothLeBroadcastMetadata:".
+     * QR code string will prefix with "BT:".
     */
-    fun BluetoothLeBroadcastMetadata.toQrCodeString(): String =
-        SCHEME_BT_BROADCAST_METADATA + Base64.encodeToString(toBytes(this), Base64.NO_WRAP)
+    fun BluetoothLeBroadcastMetadata.toQrCodeString(): String {
+        val entries = mutableListOf<Pair<String, String>>()
+        entries.add(Pair(KEY_BT_QR_VER, QR_CODE_VER.toString()))
+        entries.add(Pair(KEY_BT_ADDRESS_TYPE, this.sourceAddressType.toString()))
+        entries.add(Pair(KEY_BT_DEVICE, this.sourceDevice.address.replace(":", "-")))
+        entries.add(Pair(KEY_BT_ADVERTISING_SID, this.sourceAdvertisingSid.toString()))
+        entries.add(Pair(KEY_BT_BROADCAST_ID, this.broadcastId.toString()))
+        if (this.broadcastName != null) {
+            entries.add(Pair(KEY_BT_BROADCAST_NAME, Base64.encodeToString(
+                this.broadcastName?.toByteArray(Charsets.UTF_8), Base64.NO_WRAP)))
+        }
+        if (this.publicBroadcastMetadata != null) {
+            entries.add(Pair(KEY_BT_PUBLIC_BROADCAST_DATA, Base64.encodeToString(
+                this.publicBroadcastMetadata?.rawMetadata, Base64.NO_WRAP)))
+        }
+        entries.add(Pair(KEY_BT_SYNC_INTERVAL, this.paSyncInterval.toString()))
+        if (this.broadcastCode != null) {
+            entries.add(Pair(KEY_BT_BROADCAST_CODE,
+                Base64.encodeToString(this.broadcastCode, Base64.NO_WRAP)))
+        }
+        this.subgroups.forEach {
+                subgroup -> entries.add(Pair(KEY_BT_SUBGROUPS, subgroup.toQrCodeString())) }
+        entries.add(Pair(KEY_BT_ANDROID_VERSION, ANDROID_VER))
+        val qrCodeString = SCHEME_BT_BROADCAST_METADATA +
+                entries.toQrCodeString(DELIMITER_BT_LEVEL_1) + SUFFIX_QR_CODE
+        Log.d(TAG, "Generated QR string : $qrCodeString")
+        return qrCodeString
+    }

    /**
     * Converts QR code string to [BluetoothLeBroadcastMetadata].
@@ -39,32 +108,255 @@ object BluetoothLeBroadcastMetadataExt {
     * QR code string should prefix with "BT:BluetoothLeBroadcastMetadata:".
     */
    fun convertToBroadcastMetadata(qrCodeString: String): BluetoothLeBroadcastMetadata? {
-        if (!qrCodeString.startsWith(SCHEME_BT_BROADCAST_METADATA)) return null
+        if (!qrCodeString.startsWith(SCHEME_BT_BROADCAST_METADATA)) {
+            Log.e(TAG, "String \"$qrCodeString\" does not begin with " +
+                    "\"$SCHEME_BT_BROADCAST_METADATA\"")
+            return null
+        }
        return try {
-            val encodedString = qrCodeString.removePrefix(SCHEME_BT_BROADCAST_METADATA)
-            val bytes = Base64.decode(encodedString, Base64.NO_WRAP)
-            createFromBytes(BluetoothLeBroadcastMetadata.CREATOR, bytes)
+            Log.d(TAG, "Parsing QR string: $qrCodeString")
+            val strippedString =
+                    qrCodeString.removePrefix(SCHEME_BT_BROADCAST_METADATA)
+                            .removeSuffix(SUFFIX_QR_CODE)
+            Log.d(TAG, "Stripped to: $strippedString")
+            parseQrCodeToMetadata(strippedString)
        } catch (e: Exception) {
-            Log.w(TAG, "Cannot convert QR code string to BluetoothLeBroadcastMetadata", e)
+            Log.w(TAG, "Cannot parse: $qrCodeString", e)
            null
        }
    }

-    private fun toBytes(parcelable: Parcelable): ByteArray =
-        Parcel.obtain().run {
-            parcelable.writeToParcel(this, 0)
-            setDataPosition(0)
-            val bytes = marshall()
-            recycle()
-            bytes
-        }
+    private fun BluetoothLeBroadcastSubgroup.toQrCodeString(): String {
+        val entries = mutableListOf<Pair<String, String>>()
+        entries.add(Pair(KEY_BTSG_BIS_SYNC, getBisSyncFromChannels(this.channels).toString()))
+        entries.add(Pair(KEY_BTSG_BIS_MASK, getBisMaskFromChannels(this.channels).toString()))
+        entries.add(Pair(KEY_BTSG_AUDIO_CONTENT,
+            Base64.encodeToString(this.contentMetadata.rawMetadata, Base64.NO_WRAP)))
+        return entries.toQrCodeString(DELIMITER_BT_LEVEL_2)
+    }

-    private fun <T> createFromBytes(creator: Parcelable.Creator<T>, bytes: ByteArray): T =
-        Parcel.obtain().run {
-            unmarshall(bytes, 0, bytes.size)
-            setDataPosition(0)
-            val created = creator.createFromParcel(this)
-            recycle()
-            created
+    private fun List<Pair<String, String>>.toQrCodeString(delimiter: String): String {
+        val entryStrings = this.map{ it.first + DELIMITER_KEY_VALUE + it.second }
+        return entryStrings.joinToString(separator = delimiter)
+    }
+
+    @TargetApi(Build.VERSION_CODES.TIRAMISU)
+    private fun parseQrCodeToMetadata(input: String): BluetoothLeBroadcastMetadata {
+        // Split into a list of list
+        val level1Fields = input.split(DELIMITER_BT_LEVEL_1)
+            .map{it.split(DELIMITER_KEY_VALUE, limit = 2)}
+        var qrCodeVersion = -1
+        var sourceAddrType = BluetoothDevice.ADDRESS_TYPE_UNKNOWN
+        var sourceAddrString: String? = null
+        var sourceAdvertiserSid = -1
+        var broadcastId = -1
+        var broadcastName: String? = null
+        var publicBroadcastMetadata: BluetoothLeAudioContentMetadata? = null
+        var paSyncInterval = -1
+        var broadcastCode: ByteArray? = null
+        // List of VendorID -> Data Pairs
+        var vendorDataList = mutableListOf<Pair<Int, ByteArray?>>()
+        var androidVersion: String? = null
+        val builder = BluetoothLeBroadcastMetadata.Builder()
+
+        for (field: List<String> in level1Fields) {
+            if (field.isEmpty()) {
+                continue
+            }
+            val key = field[0]
+            // Ignore 3rd value and after
+            val value = if (field.size > 1) field[1] else ""
+            when (key) {
+                KEY_BT_QR_VER -> {
+                    require(qrCodeVersion == -1) { "Duplicate qrCodeVersion: $input" }
+                    qrCodeVersion = value.toInt()
+                }
+                KEY_BT_ADDRESS_TYPE -> {
+                    require(sourceAddrType == BluetoothDevice.ADDRESS_TYPE_UNKNOWN) {
+                        "Duplicate sourceAddrType: $input"
+                    }
+                    sourceAddrType = value.toInt()
+                }
+                KEY_BT_DEVICE -> {
+                    require(sourceAddrString == null) { "Duplicate sourceAddr: $input" }
+                    sourceAddrString = value.replace("-", ":")
+                }
+                KEY_BT_ADVERTISING_SID -> {
+                    require(sourceAdvertiserSid == -1) { "Duplicate sourceAdvertiserSid: $input" }
+                    sourceAdvertiserSid = value.toInt()
+                }
+                KEY_BT_BROADCAST_ID -> {
+                    require(broadcastId == -1) { "Duplicate broadcastId: $input" }
+                    broadcastId = value.toInt()
+                }
+                KEY_BT_BROADCAST_NAME -> {
+                    require(broadcastName == null) { "Duplicate broadcastName: $input" }
+                    broadcastName = String(Base64.decode(value, Base64.NO_WRAP))
+                }
+                KEY_BT_PUBLIC_BROADCAST_DATA -> {
+                    require(publicBroadcastMetadata == null) {
+                        "Duplicate publicBroadcastMetadata $input"
+                    }
+                    publicBroadcastMetadata = BluetoothLeAudioContentMetadata
+                        .fromRawBytes(Base64.decode(value, Base64.NO_WRAP))
+                }
+                KEY_BT_SYNC_INTERVAL -> {
+                    require(paSyncInterval == -1) { "Duplicate paSyncInterval: $input" }
+                    paSyncInterval = value.toInt()
+                }
+                KEY_BT_BROADCAST_CODE -> {
+                    require(broadcastCode == null) { "Duplicate broadcastCode: $input" }
+                    broadcastCode = Base64.decode(value, Base64.NO_WRAP)
+                }
+                KEY_BT_ANDROID_VERSION -> {
+                    require(androidVersion == null) { "Duplicate androidVersion: $input" }
+                    androidVersion = value
+                    Log.i(TAG, "QR code Android version: $androidVersion")
+                }
+                // Repeatable
+                KEY_BT_SUBGROUPS -> {
+                    builder.addSubgroup(parseSubgroupData(value))
+                }
+                // Repeatable
+                KEY_BT_VENDOR_SPECIFIC -> {
+                    vendorDataList.add(parseVendorData(value))
+                }
+            }
        }
+        Log.d(TAG, "parseQrCodeToMetadata: sourceAddrType=$sourceAddrType, " +
+                "sourceAddr=$sourceAddrString, sourceAdvertiserSid=$sourceAdvertiserSid, " +
+                "broadcastId=$broadcastId, broadcastName=$broadcastName, " +
+                "publicBroadcastMetadata=${publicBroadcastMetadata != null}, " +
+                "paSyncInterval=$paSyncInterval, " +
+                "broadcastCode=${broadcastCode?.toString(Charsets.UTF_8)}")
+        Log.d(TAG, "Not used in current code, but part of the specification: " +
+                "qrCodeVersion=$qrCodeVersion, androidVersion=$androidVersion, " +
+                "vendorDataListSize=${vendorDataList.size}")
+        val adapter = BluetoothAdapter.getDefaultAdapter()
+        // add source device and set broadcast code
+        val device = adapter.getRemoteLeDevice(requireNotNull(sourceAddrString), sourceAddrType)
+        builder.apply {
+            setSourceDevice(device, sourceAddrType)
+            setSourceAdvertisingSid(sourceAdvertiserSid)
+            setBroadcastId(broadcastId)
+            setBroadcastName(broadcastName)
+            setPublicBroadcast(publicBroadcastMetadata != null)
+            setPublicBroadcastMetadata(publicBroadcastMetadata)
+            setPaSyncInterval(paSyncInterval)
+            setEncrypted(broadcastCode != null)
+            setBroadcastCode(broadcastCode)
+            // Presentation delay is unknown and not useful when adding source
+            // Broadcast sink needs to sync to the Broadcast source to get presentation delay
+            setPresentationDelayMicros(0)
+        }
+        return builder.build()
+    }
+
+    private fun parseSubgroupData(input: String): BluetoothLeBroadcastSubgroup {
+        Log.d(TAG, "parseSubgroupData: $input")
+        val fields = input.split(DELIMITER_BT_LEVEL_2)
+        var bisSync: UInt? = null
+        var bisMask: UInt? = null
+        var metadata: ByteArray? = null
+
+        fields.forEach { field ->
+            val(key, value) = field.split(DELIMITER_KEY_VALUE)
+            when (key) {
+                KEY_BTSG_BIS_SYNC -> {
+                    require(bisSync == null) { "Duplicate bisSync: $input" }
+                    bisSync = value.toUInt()
+                }
+                KEY_BTSG_BIS_MASK -> {
+                    require(bisMask == null) { "Duplicate bisMask: $input" }
+                    bisMask = value.toUInt()
+                }
+                KEY_BTSG_AUDIO_CONTENT -> {
+                    require(metadata == null) { "Duplicate metadata: $input" }
+                    metadata = Base64.decode(value, Base64.NO_WRAP)
+                }
+            }
+        }
+        val channels = convertToChannels(requireNotNull(bisSync), requireNotNull(bisMask))
+        val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder()
+                .setAudioLocation(0).build()
+        return BluetoothLeBroadcastSubgroup.Builder().apply {
+            setCodecId(SUBGROUP_LC3_CODEC_ID)
+            setCodecSpecificConfig(audioCodecConfigMetadata)
+            setContentMetadata(
+                    BluetoothLeAudioContentMetadata.fromRawBytes(metadata ?: ByteArray(0)))
+            channels.forEach(::addChannel)
+        }.build()
+    }
+
+    private fun parseVendorData(input: String): Pair<Int, ByteArray?> {
+        var companyId = -1
+        var data: ByteArray? = null
+        val fields = input.split(DELIMITER_BT_LEVEL_2)
+        fields.forEach { field ->
+            val(key, value) = field.split(DELIMITER_KEY_VALUE)
+            when (key) {
+                KEY_BTVSD_COMPANY_ID -> {
+                    require(companyId == -1) { "Duplicate companyId: $input" }
+                    companyId = value.toInt()
+                }
+                KEY_BTVSD_VENDOR_DATA -> {
+                    require(data == null) { "Duplicate data: $input" }
+                    data = Base64.decode(value, Base64.NO_WRAP)
+                }
+            }
+        }
+        return Pair(companyId, data)
+    }
+
+    private fun getBisSyncFromChannels(channels: List<BluetoothLeBroadcastChannel>): UInt {
+        var bisSync = 0u
+        // channel index starts from 1
+        channels.forEach { channel ->
+            if (channel.isSelected && channel.channelIndex > 0) {
+                bisSync = bisSync or (1u shl (channel.channelIndex - 1))
+            }
+        }
+        // No channel is selected means no preference on Android platform
+        return if (bisSync == 0u) BIS_SYNC_NO_PREFERENCE else bisSync
+    }
+
+    private fun getBisMaskFromChannels(channels: List<BluetoothLeBroadcastChannel>): UInt {
+        var bisMask = 0u
+        // channel index starts from 1
+        channels.forEach { channel ->
+            if (channel.channelIndex > 0) {
+                bisMask = bisMask or (1u shl (channel.channelIndex - 1))
+            }
+        }
+        return bisMask
+    }
+
+    private fun convertToChannels(bisSync: UInt, bisMask: UInt):
+            List<BluetoothLeBroadcastChannel> {
+        Log.d(TAG, "convertToChannels: bisSync=$bisSync, bisMask=$bisMask")
+        var selectionMask = bisSync
+        if (bisSync != BIS_SYNC_NO_PREFERENCE) {
+            require(bisMask == (bisMask or bisSync)) {
+                "bisSync($bisSync) must select a subset of bisMask($bisMask) if it has preferences"
+            }
+        } else {
+            // No channel preference means no channel is selected
+            selectionMask = 0u
+        }
+        val channels = mutableListOf<BluetoothLeBroadcastChannel>()
+        val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder()
+                .setAudioLocation(0).build()
+        for (i in 0 until BIS_SYNC_MAX_CHANNEL) {
+            val channelMask = 1u shl i
+            if ((bisMask and channelMask) != 0u) {
+                val channel = BluetoothLeBroadcastChannel.Builder().apply {
+                    setSelected((selectionMask and channelMask) != 0u)
+                    setChannelIndex(i + 1)
+                    setCodecMetadata(audioCodecConfigMetadata)
+                }
+                channels.add(channel.build())
+            }
+        }
+        return channels
+    }
 }
--- a/packages/SettingsLib/tests/unit/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExtTest.kt
+++ b/packages/SettingsLib/tests/unit/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExtTest.kt
@@ -34,24 +34,33 @@ class BluetoothLeBroadcastMetadataExtTest {
    @Test
    fun toQrCodeString() {
        val subgroup = BluetoothLeBroadcastSubgroup.Builder().apply {
-            setCodecId(100)
+            setCodecId(0x6)
            val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder().build()
            setCodecSpecificConfig(audioCodecConfigMetadata)
-            setContentMetadata(BluetoothLeAudioContentMetadata.Builder().build())
+            setContentMetadata(BluetoothLeAudioContentMetadata.Builder()
+                    .setProgramInfo("Test").setLanguage("eng").build())
            addChannel(BluetoothLeBroadcastChannel.Builder().apply {
-                setChannelIndex(1000)
+                setSelected(true)
+                setChannelIndex(2)
+                setCodecMetadata(audioCodecConfigMetadata)
+            }.build())
+            addChannel(BluetoothLeBroadcastChannel.Builder().apply {
+                setSelected(true)
+                setChannelIndex(1)
                setCodecMetadata(audioCodecConfigMetadata)
            }.build())
        }.build()

        val metadata = BluetoothLeBroadcastMetadata.Builder().apply {
-            setSourceDevice(Device, 0)
+            setSourceDevice(Device, BluetoothDevice.ADDRESS_TYPE_RANDOM)
            setSourceAdvertisingSid(1)
-            setBroadcastId(2)
-            setPaSyncInterval(3)
+            setBroadcastId(123456)
+            setBroadcastName("Test")
+            setPublicBroadcastMetadata(BluetoothLeAudioContentMetadata.Builder()
+                    .setProgramInfo("pTest").build())
+            setPaSyncInterval(160)
            setEncrypted(true)
-            setBroadcastCode(byteArrayOf(10, 11, 12, 13))
-            setPresentationDelayMicros(4)
+            setBroadcastCode("TestCode".toByteArray(Charsets.UTF_8))
            addSubgroup(subgroup)
        }.build()

@@ -60,6 +69,108 @@ class BluetoothLeBroadcastMetadataExtTest {
        assertThat(qrCodeString).isEqualTo(QR_CODE_STRING)
    }

+    @Test
+    fun toQrCodeString_NoChannelSelected() {
+        val subgroup = BluetoothLeBroadcastSubgroup.Builder().apply {
+            setCodecId(0x6)
+            val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder().build()
+            setCodecSpecificConfig(audioCodecConfigMetadata)
+            setContentMetadata(BluetoothLeAudioContentMetadata.Builder()
+                .setProgramInfo("Test").setLanguage("eng").build())
+            addChannel(BluetoothLeBroadcastChannel.Builder().apply {
+                setSelected(false)
+                setChannelIndex(2)
+                setCodecMetadata(audioCodecConfigMetadata)
+            }.build())
+            addChannel(BluetoothLeBroadcastChannel.Builder().apply {
+                setSelected(false)
+                setChannelIndex(1)
+                setCodecMetadata(audioCodecConfigMetadata)
+            }.build())
+        }.build()
+
+        val metadata = BluetoothLeBroadcastMetadata.Builder().apply {
+            setSourceDevice(Device, BluetoothDevice.ADDRESS_TYPE_RANDOM)
+            setSourceAdvertisingSid(1)
+            setBroadcastId(123456)
+            setBroadcastName("Test")
+            setPublicBroadcastMetadata(BluetoothLeAudioContentMetadata.Builder()
+                .setProgramInfo("pTest").build())
+            setPaSyncInterval(160)
+            setEncrypted(true)
+            setBroadcastCode("TestCode".toByteArray(Charsets.UTF_8))
+            addSubgroup(subgroup)
+        }.build()
+
+        val qrCodeString = metadata.toQrCodeString()
+
+        val parsedMetadata =
+            BluetoothLeBroadcastMetadataExt.convertToBroadcastMetadata(qrCodeString)!!
+
+        assertThat(parsedMetadata).isNotNull()
+        assertThat(parsedMetadata.subgroups).isNotNull()
+        assertThat(parsedMetadata.subgroups.size).isEqualTo(1)
+        assertThat(parsedMetadata.subgroups[0].channels).isNotNull()
+        assertThat(parsedMetadata.subgroups[0].channels.size).isEqualTo(2)
+        assertThat(parsedMetadata.subgroups[0].hasChannelPreference()).isFalse()
+        // Input order does not matter due to parsing through bisMask
+        assertThat(parsedMetadata.subgroups[0].channels[0].channelIndex).isEqualTo(1)
+        assertThat(parsedMetadata.subgroups[0].channels[0].isSelected).isFalse()
+        assertThat(parsedMetadata.subgroups[0].channels[1].channelIndex).isEqualTo(2)
+        assertThat(parsedMetadata.subgroups[0].channels[1].isSelected).isFalse()
+    }
+
+    @Test
+    fun toQrCodeString_OneChannelSelected() {
+        val subgroup = BluetoothLeBroadcastSubgroup.Builder().apply {
+            setCodecId(0x6)
+            val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder().build()
+            setCodecSpecificConfig(audioCodecConfigMetadata)
+            setContentMetadata(BluetoothLeAudioContentMetadata.Builder()
+                .setProgramInfo("Test").setLanguage("eng").build())
+            addChannel(BluetoothLeBroadcastChannel.Builder().apply {
+                setSelected(false)
+                setChannelIndex(1)
+                setCodecMetadata(audioCodecConfigMetadata)
+            }.build())
+            addChannel(BluetoothLeBroadcastChannel.Builder().apply {
+                setSelected(true)
+                setChannelIndex(2)
+                setCodecMetadata(audioCodecConfigMetadata)
+            }.build())
+        }.build()
+
+        val metadata = BluetoothLeBroadcastMetadata.Builder().apply {
+            setSourceDevice(Device, BluetoothDevice.ADDRESS_TYPE_RANDOM)
+            setSourceAdvertisingSid(1)
+            setBroadcastId(123456)
+            setBroadcastName("Test")
+            setPublicBroadcastMetadata(BluetoothLeAudioContentMetadata.Builder()
+                .setProgramInfo("pTest").build())
+            setPaSyncInterval(160)
+            setEncrypted(true)
+            setBroadcastCode("TestCode".toByteArray(Charsets.UTF_8))
+            addSubgroup(subgroup)
+        }.build()
+
+        val qrCodeString = metadata.toQrCodeString()
+
+        val parsedMetadata =
+            BluetoothLeBroadcastMetadataExt.convertToBroadcastMetadata(qrCodeString)!!
+
+        assertThat(parsedMetadata).isNotNull()
+        assertThat(parsedMetadata.subgroups).isNotNull()
+        assertThat(parsedMetadata.subgroups.size).isEqualTo(1)
+        assertThat(parsedMetadata.subgroups[0].channels).isNotNull()
+        // Only selected channel can be recovered
+        assertThat(parsedMetadata.subgroups[0].channels.size).isEqualTo(2)
+        assertThat(parsedMetadata.subgroups[0].hasChannelPreference()).isTrue()
+        assertThat(parsedMetadata.subgroups[0].channels[0].channelIndex).isEqualTo(1)
+        assertThat(parsedMetadata.subgroups[0].channels[0].isSelected).isFalse()
+        assertThat(parsedMetadata.subgroups[0].channels[1].channelIndex).isEqualTo(2)
+        assertThat(parsedMetadata.subgroups[0].channels[1].isSelected).isTrue()
+    }
+
    @Test
    fun decodeAndEncodeAgain_sameString() {
        val metadata = BluetoothLeBroadcastMetadataExt.convertToBroadcastMetadata(QR_CODE_STRING)!!
@@ -73,13 +184,12 @@ class BluetoothLeBroadcastMetadataExtTest {
        const val TEST_DEVICE_ADDRESS = "00:A1:A1:A1:A1:A1"

        val Device: BluetoothDevice =
-            BluetoothAdapter.getDefaultAdapter().getRemoteDevice(TEST_DEVICE_ADDRESS)
+            BluetoothAdapter.getDefaultAdapter().getRemoteLeDevice(TEST_DEVICE_ADDRESS,
+                BluetoothDevice.ADDRESS_TYPE_RANDOM)

        const val QR_CODE_STRING =
-            "BT:BluetoothLeBroadcastMetadata:AAAAAAEAAAABAAAAEQAAADAAMAA6AEEAMQA6AEEAMQA6AEEAMQA6" +
-                "AEEAMQA6AEEAMQAAAAAAAAABAAAAAgAAAAMAAAABAAAABAAAAAQAAAAKCwwNBAAAAAEAAAABAAAAZAAA" +
-                "AAAAAAABAAAAAAAAAAAAAAAGAAAABgAAAAUDAAAAAAAAAAAAAAAAAAAAAAAAAQAAAP//////////AAAA" +
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-                "AAAAAAD/////AAAAAAAAAAA="
+            "BT:R:65536;T:1;D:00-A1-A1-A1-A1-A1;AS:1;B:123456;BN:VGVzdA==;" +
+            "PM:BgNwVGVzdA==;SI:160;C:VGVzdENvZGU=;SG:BS:3,BM:3,AC:BQNUZXN0BARlbmc=;" +
+            "VN:U;;"
    }
 }