diff options
Diffstat (limited to 'packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt')
| -rw-r--r-- | packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt | 399 |
1 files changed, 212 insertions, 187 deletions
diff --git a/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt b/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt index 9bb11f8da645..0c7d6f093289 100644 --- a/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt +++ b/packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt @@ -31,38 +31,34 @@ import com.android.settingslib.bluetooth.BluetoothBroadcastUtils.SCHEME_BT_BROAD object 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" + // Data Elements for directing Broadcast Assistants 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_BT_ADVERTISER_ADDRESS_TYPE = "AT" + private const val KEY_BT_ADVERTISER_ADDRESS = "AD" + private const val KEY_BT_BROADCAST_ID = "BI" + private const val KEY_BT_BROADCAST_CODE = "BC" + private const val KEY_BT_STREAM_METADATA = "MD" + private const val KEY_BT_STANDARD_QUALITY = "SQ" + private const val KEY_BT_HIGH_QUALITY = "HQ" + + // Extended Bluetooth URI Data Elements + private const val KEY_BT_ADVERTISING_SID = "AS" + private const val KEY_BT_PA_INTERVAL = "PI" + private const val KEY_BT_NUM_SUBGROUPS = "NS" + + // Subgroup data elements private const val KEY_BTSG_BIS_SYNC = "BS" - private const val KEY_BTSG_BIS_MASK = "BM" - private const val KEY_BTSG_AUDIO_CONTENT = "AC" + private const val KEY_BTSG_NUM_BISES = "NB" + private const val KEY_BTSG_METADATA = "SM" - // Vendor specific data - private const val KEY_BTVSD_COMPANY_ID = "VI" - private const val KEY_BTVSD_VENDOR_DATA = "VD" + // Vendor specific data, not being used + private const val KEY_BTVSD_VENDOR_DATA = "VS" private const val DELIMITER_KEY_VALUE = ":" - private const val DELIMITER_BT_LEVEL_1 = ";" - private const val DELIMITER_BT_LEVEL_2 = "," + private const val DELIMITER_ELEMENT = ";" 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 @@ -71,33 +67,55 @@ object BluetoothLeBroadcastMetadataExt { /** * Converts [BluetoothLeBroadcastMetadata] to QR code string. * - * QR code string will prefix with "BT:". + * QR code string will prefix with "BLUETOOTH:UUID:184F". */ 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())) + // Generate data elements for directing Broadcast Assistants + require(this.broadcastName != null) { "Broadcast name is mandatory for QR code" } + entries.add(Pair(KEY_BT_BROADCAST_NAME, Base64.encodeToString( + this.broadcastName?.toByteArray(Charsets.UTF_8), Base64.NO_WRAP))) + entries.add(Pair(KEY_BT_ADVERTISER_ADDRESS_TYPE, this.sourceAddressType.toString())) + entries.add(Pair(KEY_BT_ADVERTISER_ADDRESS, this.sourceDevice.address.replace(":", ""))) + entries.add(Pair(KEY_BT_BROADCAST_ID, String.format("%X", this.broadcastId.toLong()))) if (this.broadcastCode != null) { entries.add(Pair(KEY_BT_BROADCAST_CODE, Base64.encodeToString(this.broadcastCode, Base64.NO_WRAP))) } + if (this.publicBroadcastMetadata != null && + this.publicBroadcastMetadata?.rawMetadata?.size != 0) { + entries.add(Pair(KEY_BT_STREAM_METADATA, Base64.encodeToString( + this.publicBroadcastMetadata?.rawMetadata, Base64.NO_WRAP))) + } + if ((this.audioConfigQuality and + BluetoothLeBroadcastMetadata.AUDIO_CONFIG_QUALITY_STANDARD) != 0) { + entries.add(Pair(KEY_BT_STANDARD_QUALITY, "1")) + } + if ((this.audioConfigQuality and + BluetoothLeBroadcastMetadata.AUDIO_CONFIG_QUALITY_HIGH) != 0) { + entries.add(Pair(KEY_BT_HIGH_QUALITY, "1")) + } + + // Generate extended Bluetooth URI data elements + entries.add(Pair(KEY_BT_ADVERTISING_SID, + String.format("%X", this.sourceAdvertisingSid.toLong()))) + entries.add(Pair(KEY_BT_PA_INTERVAL, String.format("%X", this.paSyncInterval.toLong()))) + entries.add(Pair(KEY_BT_NUM_SUBGROUPS, String.format("%X", this.subgroups.size.toLong()))) + this.subgroups.forEach { - subgroup -> entries.add(Pair(KEY_BT_SUBGROUPS, subgroup.toQrCodeString())) } - entries.add(Pair(KEY_BT_ANDROID_VERSION, ANDROID_VER)) + val (bisSync, bisCount) = getBisSyncFromChannels(it.channels) + entries.add(Pair(KEY_BTSG_BIS_SYNC, String.format("%X", bisSync.toLong()))) + if (bisCount > 0u) { + entries.add(Pair(KEY_BTSG_NUM_BISES, String.format("%X", bisCount.toLong()))) + } + if (it.contentMetadata.rawMetadata.size != 0) { + entries.add(Pair(KEY_BTSG_METADATA, + Base64.encodeToString(it.contentMetadata.rawMetadata, Base64.NO_WRAP))) + } + } + val qrCodeString = SCHEME_BT_BROADCAST_METADATA + - entries.toQrCodeString(DELIMITER_BT_LEVEL_1) + SUFFIX_QR_CODE + entries.toQrCodeString(DELIMITER_ELEMENT) + SUFFIX_QR_CODE Log.d(TAG, "Generated QR string : $qrCodeString") return qrCodeString } @@ -105,7 +123,7 @@ object BluetoothLeBroadcastMetadataExt { /** * Converts QR code string to [BluetoothLeBroadcastMetadata]. * - * QR code string should prefix with "BT:BluetoothLeBroadcastMetadata:". + * QR code string should prefix with "BLUETOOTH:UUID:184F". */ fun convertToBroadcastMetadata(qrCodeString: String): BluetoothLeBroadcastMetadata? { if (!qrCodeString.startsWith(SCHEME_BT_BROADCAST_METADATA)) { @@ -126,15 +144,6 @@ object BluetoothLeBroadcastMetadataExt { } } - 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 List<Pair<String, String>>.toQrCodeString(delimiter: String): String { val entryStrings = this.map{ it.first + DELIMITER_KEY_VALUE + it.second } return entryStrings.joinToString(separator = delimiter) @@ -143,23 +152,29 @@ object BluetoothLeBroadcastMetadataExt { @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) + val elementFields = input.split(DELIMITER_ELEMENT) .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 streamMetadata: BluetoothLeAudioContentMetadata? = null var paSyncInterval = -1 var broadcastCode: ByteArray? = null - // List of VendorID -> Data Pairs - var vendorDataList = mutableListOf<Pair<Int, ByteArray?>>() - var androidVersion: String? = null + var audioConfigQualityStandard = -1 + var audioConfigQualityHigh = -1 + var numSubgroups = -1 + + // List of subgroup data + var subgroupBisSyncList = mutableListOf<UInt>() + var subgroupNumOfBisesList = mutableListOf<UInt>() + var subgroupMetadataList = mutableListOf<ByteArray?>() + val builder = BluetoothLeBroadcastMetadata.Builder() - for (field: List<String> in level1Fields) { + for (field: List<String> in elementFields) { if (field.isEmpty()) { continue } @@ -167,190 +182,200 @@ object BluetoothLeBroadcastMetadataExt { // 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() + // Parse data elements for directing Broadcast Assistants + KEY_BT_BROADCAST_NAME -> { + require(broadcastName == null) { "Duplicate broadcastName: $input" } + broadcastName = String(Base64.decode(value, Base64.NO_WRAP)) } - KEY_BT_ADDRESS_TYPE -> { + KEY_BT_ADVERTISER_ADDRESS_TYPE -> { require(sourceAddrType == BluetoothDevice.ADDRESS_TYPE_UNKNOWN) { "Duplicate sourceAddrType: $input" } sourceAddrType = value.toInt() } - KEY_BT_DEVICE -> { + KEY_BT_ADVERTISER_ADDRESS -> { require(sourceAddrString == null) { "Duplicate sourceAddr: $input" } - sourceAddrString = value.replace("-", ":") - } - KEY_BT_ADVERTISING_SID -> { - require(sourceAdvertiserSid == -1) { "Duplicate sourceAdvertiserSid: $input" } - sourceAdvertiserSid = value.toInt() + sourceAddrString = value.chunked(2).joinToString(":") } KEY_BT_BROADCAST_ID -> { require(broadcastId == -1) { "Duplicate broadcastId: $input" } - broadcastId = value.toInt() + broadcastId = value.toInt(16) } - KEY_BT_BROADCAST_NAME -> { - require(broadcastName == null) { "Duplicate broadcastName: $input" } - broadcastName = String(Base64.decode(value, Base64.NO_WRAP)) + KEY_BT_BROADCAST_CODE -> { + require(broadcastCode == null) { "Duplicate broadcastCode: $input" } + + broadcastCode = Base64.decode(value.dropLastWhile { it.equals(0.toByte()) } + .toByteArray(), Base64.NO_WRAP) } - KEY_BT_PUBLIC_BROADCAST_DATA -> { - require(publicBroadcastMetadata == null) { - "Duplicate publicBroadcastMetadata $input" + KEY_BT_STREAM_METADATA -> { + require(streamMetadata == null) { + "Duplicate streamMetadata $input" } - publicBroadcastMetadata = BluetoothLeAudioContentMetadata + streamMetadata = BluetoothLeAudioContentMetadata .fromRawBytes(Base64.decode(value, Base64.NO_WRAP)) } - KEY_BT_SYNC_INTERVAL -> { + KEY_BT_STANDARD_QUALITY -> { + require(audioConfigQualityStandard == -1) { + "Duplicate audioConfigQualityStandard: $input" + } + audioConfigQualityStandard = value.toInt() + } + KEY_BT_HIGH_QUALITY -> { + require(audioConfigQualityHigh == -1) { + "Duplicate audioConfigQualityHigh: $input" + } + audioConfigQualityHigh = value.toInt() + } + + // Parse extended Bluetooth URI data elements + KEY_BT_ADVERTISING_SID -> { + require(sourceAdvertiserSid == -1) { "Duplicate sourceAdvertiserSid: $input" } + sourceAdvertiserSid = value.toInt(16) + } + KEY_BT_PA_INTERVAL -> { require(paSyncInterval == -1) { "Duplicate paSyncInterval: $input" } - paSyncInterval = value.toInt() + paSyncInterval = value.toInt(16) } - KEY_BT_BROADCAST_CODE -> { - require(broadcastCode == null) { "Duplicate broadcastCode: $input" } - broadcastCode = Base64.decode(value, Base64.NO_WRAP) + KEY_BT_NUM_SUBGROUPS -> { + require(numSubgroups == -1) { "Duplicate numSubgroups: $input" } + numSubgroups = value.toInt(16) } - KEY_BT_ANDROID_VERSION -> { - require(androidVersion == null) { "Duplicate androidVersion: $input" } - androidVersion = value - Log.i(TAG, "QR code Android version: $androidVersion") + + // Repeatable subgroup elements + KEY_BTSG_BIS_SYNC -> { + subgroupBisSyncList.add(value.toUInt(16)) } - // Repeatable - KEY_BT_SUBGROUPS -> { - builder.addSubgroup(parseSubgroupData(value)) + KEY_BTSG_NUM_BISES -> { + subgroupNumOfBisesList.add(value.toUInt(16)) } - // Repeatable - KEY_BT_VENDOR_SPECIFIC -> { - vendorDataList.add(parseVendorData(value)) + KEY_BTSG_METADATA -> { + subgroupMetadataList.add(Base64.decode(value, Base64.NO_WRAP)) } } } - Log.d(TAG, "parseQrCodeToMetadata: sourceAddrType=$sourceAddrType, " + + Log.d(TAG, "parseQrCodeToMetadata: main data elements sourceAddrType=$sourceAddrType, " + "sourceAddr=$sourceAddrString, sourceAdvertiserSid=$sourceAdvertiserSid, " + "broadcastId=$broadcastId, broadcastName=$broadcastName, " + - "publicBroadcastMetadata=${publicBroadcastMetadata != null}, " + + "streamMetadata=${streamMetadata != null}, " + "paSyncInterval=$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}") + "broadcastCode=${broadcastCode?.toString(Charsets.UTF_8)}, " + + "audioConfigQualityStandard=$audioConfigQualityStandard, " + + "audioConfigQualityHigh=$audioConfigQualityHigh") + val adapter = BluetoothAdapter.getDefaultAdapter() + // Check parsed elements data + require(broadcastName != null) { + "broadcastName($broadcastName) must present in QR code string" + } + var addr = sourceAddrString + var addrType = sourceAddrType + if (sourceAddrString != null) { + require(sourceAddrType != BluetoothDevice.ADDRESS_TYPE_UNKNOWN) { + "sourceAddrType($sourceAddrType) must present if address present" + } + } else { + // Use placeholder device if not present + addr = "FF:FF:FF:FF:FF:FF" + addrType = BluetoothDevice.ADDRESS_TYPE_RANDOM + } + val device = adapter.getRemoteLeDevice(requireNotNull(addr), addrType) + // add source device and set broadcast code - val device = adapter.getRemoteLeDevice(requireNotNull(sourceAddrString), sourceAddrType) + var audioConfigQuality = BluetoothLeBroadcastMetadata.AUDIO_CONFIG_QUALITY_NONE or + (if (audioConfigQualityStandard != -1) audioConfigQualityStandard else 0) or + (if (audioConfigQualityHigh != -1) audioConfigQualityHigh else 0) + + // process subgroup data + // metadata should include at least 1 subgroup for metadata, add a placeholder group if not present + numSubgroups = if (numSubgroups > 0) numSubgroups else 1 + for (i in 0 until numSubgroups) { + val bisSync = subgroupBisSyncList.getOrNull(i) + val bisNum = subgroupNumOfBisesList.getOrNull(i) + val metadata = subgroupMetadataList.getOrNull(i) + + val channels = convertToChannels(bisSync, bisNum) + val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder() + .setAudioLocation(0).build() + val subgroup = BluetoothLeBroadcastSubgroup.Builder().apply { + setCodecId(SUBGROUP_LC3_CODEC_ID) + setCodecSpecificConfig(audioCodecConfigMetadata) + setContentMetadata( + BluetoothLeAudioContentMetadata.fromRawBytes(metadata ?: ByteArray(0))) + channels.forEach(::addChannel) + }.build() + + Log.d(TAG, "parseQrCodeToMetadata: subgroup $i elements bisSync=$bisSync, " + + "bisNum=$bisNum, metadata=${metadata != null}") + + builder.addSubgroup(subgroup) + } + builder.apply { - setSourceDevice(device, sourceAddrType) + setSourceDevice(device, addrType) setSourceAdvertisingSid(sourceAdvertiserSid) setBroadcastId(broadcastId) setBroadcastName(broadcastName) - setPublicBroadcast(publicBroadcastMetadata != null) - setPublicBroadcastMetadata(publicBroadcastMetadata) + // QR code should set PBP(public broadcast profile) for auracast + setPublicBroadcast(true) + setPublicBroadcastMetadata(streamMetadata) 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) + setAudioConfigQuality(audioConfigQuality) } 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: $input" } - data = Base64.decode(value, Base64.NO_WRAP) - } - } - } - return Pair(companyId, data) - } - - private fun getBisSyncFromChannels(channels: List<BluetoothLeBroadcastChannel>): UInt { + private fun getBisSyncFromChannels( + channels: List<BluetoothLeBroadcastChannel> + ): Pair<UInt, UInt> { var bisSync = 0u - // channel index starts from 1 - channels.forEach { channel -> - if (channel.isSelected && channel.channelIndex > 0) { - bisSync = bisSync or (1u shl (channel.channelIndex - 1)) - } - } - // No channel is selected means no preference on Android platform - return if (bisSync == 0u) BIS_SYNC_NO_PREFERENCE else bisSync - } - - private fun getBisMaskFromChannels(channels: List<BluetoothLeBroadcastChannel>): UInt { - var bisMask = 0u + var bisCount = 0u // channel index starts from 1 channels.forEach { channel -> if (channel.channelIndex > 0) { - bisMask = bisMask or (1u shl (channel.channelIndex - 1)) + bisCount++ + if (channel.isSelected) { + bisSync = bisSync or (1u shl (channel.channelIndex - 1)) + } } } - return bisMask + // No channel is selected means no preference on Android platform + return if (bisSync == 0u) Pair(BIS_SYNC_NO_PREFERENCE, bisCount) + else Pair(bisSync, bisCount) } - private fun convertToChannels(bisSync: UInt, bisMask: UInt): - List<BluetoothLeBroadcastChannel> { - Log.d(TAG, "convertToChannels: bisSync=$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($bisMask) if it has preferences" - } - } else { - // No channel preference means no channel is selected - selectionMask = 0u - } + private fun convertToChannels( + bisSync: UInt?, + bisNum: UInt? + ): List<BluetoothLeBroadcastChannel> { + Log.d(TAG, "convertToChannels: bisSync=$bisSync, bisNum=$bisNum") + // if no BIS_SYNC or BIS_NUM available or BIS_SYNC is no preference + // return empty channel map with one placeholder channel + var selectedChannels = if (bisSync != null && bisNum != null) bisSync else 0u val channels = mutableListOf<BluetoothLeBroadcastChannel>() val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder() .setAudioLocation(0).build() + + if (bisSync == BIS_SYNC_NO_PREFERENCE || selectedChannels == 0u) { + // No channel preference means no channel is selected + // Generate one placeholder channel for metadata + val channel = BluetoothLeBroadcastChannel.Builder().apply { + setSelected(false) + setChannelIndex(1) + setCodecMetadata(audioCodecConfigMetadata) + } + return listOf(channel.build()) + } + for (i in 0 until BIS_SYNC_MAX_CHANNEL) { val channelMask = 1u shl i - if ((bisMask and channelMask) != 0u) { + if ((selectedChannels and channelMask) != 0u) { val channel = BluetoothLeBroadcastChannel.Builder().apply { - setSelected((selectionMask and channelMask) != 0u) + setSelected(true) setChannelIndex(i + 1) setCodecMetadata(audioCodecConfigMetadata) } |