[Audiosharing] Update QR code format to follow BT SIG standard

Bug: 324655158
Test: atest com.android.settingslib.bluetooth.BluetoothLeBroadcastMetadataExtTest
Test: manually tested with broadcast source and assistant by QR code
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:4abfa5bed1a35a9a9b5ac54951296b3edde4ee9a)
Merged-In: I798666b89c4e3558c7528bace0346caf8218dc53
Change-Id: I798666b89c4e3558c7528bace0346caf8218dc53

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:";
+    public static final String SCHEME_BT_BROADCAST_METADATA = "BLUETOOTH:UUID:184F;";
 }

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

@@ -32,7 +32,7 @@ import org.junit.runner.RunWith
 class BluetoothLeBroadcastMetadataExtTest {
 
     @Test
-    fun toQrCodeString() {
+    fun toQrCodeString_encrypted() {
         val subgroup = BluetoothLeBroadcastSubgroup.Builder().apply {
             setCodecId(0x6)
             val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder().build()
@@ -69,6 +69,37 @@ class BluetoothLeBroadcastMetadataExtTest {
         assertThat(qrCodeString).isEqualTo(QR_CODE_STRING)
     }
 
+    @Test
+    fun toQrCodeString_non_encrypted() {
+        val subgroup = BluetoothLeBroadcastSubgroup.Builder().apply {
+            setCodecId(0x6)
+            val audioCodecConfigMetadata = BluetoothLeAudioCodecConfigMetadata.Builder().build()
+            setContentMetadata(BluetoothLeAudioContentMetadata.Builder()
+                .build())
+            setCodecSpecificConfig(audioCodecConfigMetadata)
+            addChannel(BluetoothLeBroadcastChannel.Builder().apply {
+                setSelected(true)
+                setChannelIndex(1)
+                setCodecMetadata(audioCodecConfigMetadata)
+            }.build())
+        }.build()
+
+        val metadata = BluetoothLeBroadcastMetadata.Builder().apply {
+            setSourceDevice(DevicePublic, BluetoothDevice.ADDRESS_TYPE_PUBLIC)
+            setSourceAdvertisingSid(1)
+            setBroadcastId(0xDE51E9)
+            setBroadcastName("Hockey")
+            setAudioConfigQuality(BluetoothLeBroadcastMetadata.AUDIO_CONFIG_QUALITY_STANDARD)
+            setPaSyncInterval(0xFFFF)
+            setEncrypted(false)
+            addSubgroup(subgroup)
+        }.build()
+
+        val qrCodeString = metadata.toQrCodeString()
+
+        assertThat(qrCodeString).isEqualTo(QR_CODE_STRING_NON_ENCRYPTED)
+    }
+
     @Test
     fun toQrCodeString_NoChannelSelected() {
         val subgroup = BluetoothLeBroadcastSubgroup.Builder().apply {
@@ -102,6 +133,7 @@ class BluetoothLeBroadcastMetadataExtTest {
             addSubgroup(subgroup)
         }.build()
 
+        // if no channel is selected, no preference(0xFFFFFFFFu) will be set in BIS
         val qrCodeString = metadata.toQrCodeString()
 
         val parsedMetadata =
@@ -111,13 +143,11 @@ class BluetoothLeBroadcastMetadataExtTest {
         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].channels.size).isEqualTo(1)
         assertThat(parsedMetadata.subgroups[0].hasChannelPreference()).isFalse()
-        // Input order does not matter due to parsing through bisMask
+        // placeholder channel with not selected
         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
@@ -162,13 +192,11 @@ class BluetoothLeBroadcastMetadataExtTest {
         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)
+        // Only selected channel can be recovered, non-selected ones will be ignored
+        assertThat(parsedMetadata.subgroups[0].channels.size).isEqualTo(1)
         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()
+        assertThat(parsedMetadata.subgroups[0].channels[0].channelIndex).isEqualTo(2)
+        assertThat(parsedMetadata.subgroups[0].channels[0].isSelected).isTrue()
     }
 
     @Test
@@ -180,16 +208,34 @@ class BluetoothLeBroadcastMetadataExtTest {
         assertThat(qrCodeString).isEqualTo(QR_CODE_STRING)
     }
 
+    @Test
+    fun decodeAndEncodeAgain_sameString_non_encrypted() {
+        val metadata =
+                BluetoothLeBroadcastMetadataExt
+                        .convertToBroadcastMetadata(QR_CODE_STRING_NON_ENCRYPTED)!!
+
+        val qrCodeString = metadata.toQrCodeString()
+
+        assertThat(qrCodeString).isEqualTo(QR_CODE_STRING_NON_ENCRYPTED)
+    }
+
     private companion object {
         const val TEST_DEVICE_ADDRESS = "00:A1:A1:A1:A1:A1"
+        const val TEST_DEVICE_ADDRESS_PUBLIC = "AA:BB:CC:00:11:22"
 
         val Device: BluetoothDevice =
             BluetoothAdapter.getDefaultAdapter().getRemoteLeDevice(TEST_DEVICE_ADDRESS,
                 BluetoothDevice.ADDRESS_TYPE_RANDOM)
 
+        val DevicePublic: BluetoothDevice =
+            BluetoothAdapter.getDefaultAdapter().getRemoteLeDevice(TEST_DEVICE_ADDRESS_PUBLIC,
+                BluetoothDevice.ADDRESS_TYPE_PUBLIC)
+
         const val QR_CODE_STRING =
-            "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;;"
+            "BLUETOOTH:UUID:184F;BN:VGVzdA==;AT:1;AD:00A1A1A1A1A1;BI:1E240;BC:VGVzdENvZGU=;" +
+            "MD:BgNwVGVzdA==;AS:1;PI:A0;NS:1;BS:3;NB:2;SM:BQNUZXN0BARlbmc=;;"
+        const val QR_CODE_STRING_NON_ENCRYPTED =
+            "BLUETOOTH:UUID:184F;BN:SG9ja2V5;AT:0;AD:AABBCC001122;BI:DE51E9;SQ:1;AS:1;PI:FFFF;" +
+            "NS:1;BS:1;NB:1;;"
     }
 }
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