Merge "LE Audio: Implement QR code V2 for LEA broadcast" into udc-dev am: 8da013de74 (63a39bcb) · Commits · e / os / android_frameworks_base

packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothBroadcastUtils.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -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:";
		}

packages/SettingsLib/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExt.kt

+317 −25

Original line number	Diff line number	Diff line
		@@ -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 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 <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 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
		}
		}
		No newline at end of file

packages/SettingsLib/tests/unit/src/com/android/settingslib/bluetooth/BluetoothLeBroadcastMetadataExtTest.kt

+124 −14

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