samples: Add USB Audio to broadcast audio source

Adds support for using a connected host to
broadcast audio via USB Audio.

Sets BT_DATA_BROADCAST_NAME to BT_DEVICE_NAME
for discovery on receivers not using BT_DEVICE_NAME.

Offload LC3 encoding to separate thread.

Limits streams to one channel.

Signed-off-by: Lars Knudsen <[email protected]>

samples/bluetooth/broadcast_audio_source/boards/nrf5340_audio_dk_nrf5340_cpuapp.conf

@@ -9,4 +9,21 @@ CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
 # LC3 lib requires floating point support in the c-lib NEWLIB is one way of getting that.
 CONFIG_NEWLIB_LIBC=y
 CONFIG_MAIN_STACK_SIZE=4096
+
+# USB Audio related configs
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_PRODUCT="Zephyr Broadcast Source"
+CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=n
+CONFIG_USB_DEVICE_AUDIO=y
+
+# Two streams in one subgroup
+CONFIG_BT_ISO_MAX_CHAN=2
+CONFIG_BT_BAP_BROADCAST_SRC_STREAM_COUNT=2
+CONFIG_BT_BAP_BROADCAST_SRC_SUBGROUP_COUNT=1
+
+# Audio buffer
+CONFIG_RING_BUFFER=y
+
+# Additional BT settings
+CONFIG_BT_ECC=y
 CONFIG_BT_TINYCRYPT_ECC=y