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samples: Add USB Audio to broadcast audio source
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Adds support for using a connected host to
broadcast audio via USB Audio.

Offload LC3 encoding to separate thread.

Signed-off-by: Lars Knudsen <[email protected]>
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@larsgk @carlescufi
larsgk authored and carlescufi committed Nov 14, 2023
1 parent 1fbcccd commit 78714b1
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Showing 5 changed files with 297 additions and 80 deletions.
9 changes: 9 additions & 0 deletions samples/bluetooth/broadcast_audio_source/Kconfig
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Expand Up @@ -28,4 +28,13 @@ config ENABLE_LC3
select LIBLC3
select FPU

config USE_USB_AUDIO_INPUT
bool "Use USB Audio as input"
# By default, use the USB Audio path is disabled.
default n
depends on ENABLE_LC3
select USB_DEVICE_STACK
select USB_DEVICE_AUDIO
select RING_BUFFER

source "Kconfig.zephyr"
10 changes: 7 additions & 3 deletions samples/bluetooth/broadcast_audio_source/boards/nrf5340_audio_dk_nrf5340_cpuapp.conf
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@@ -1,4 +1,8 @@
# The LC3 codec uses a large amount of stack. This app runs the codec in the work-queue, hence
# inctease stack size for that thread.
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
CONFIG_MAIN_STACK_SIZE=4096

# Use USB Audio as input
CONFIG_USE_USB_AUDIO_INPUT=y
CONFIG_USB_DEVICE_PRODUCT="Zephyr Broadcast Source"

# Two streams in one subgroup (stereo)
CONFIG_BT_BAP_BROADCAST_SRC_SUBGROUP_COUNT=1
3 changes: 0 additions & 3 deletions samples/bluetooth/broadcast_audio_source/boards/nrf5340dk_nrf5340_cpuapp.conf
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@@ -1,4 +1 @@
# The LC3 codec uses a large amount of stack. This app runs the codec in the work-queue, hence
# inctease stack size for that thread.
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
CONFIG_MAIN_STACK_SIZE=4096
2 changes: 0 additions & 2 deletions samples/bluetooth/broadcast_audio_source/prj.conf
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Expand Up @@ -13,5 +13,3 @@ CONFIG_BT_ISO_TX_BUF_COUNT=4
CONFIG_BT_ISO_TX_MTU=60

CONFIG_BT_DEVICE_NAME="Broadcast Audio Source"

CONFIG_BT_TINYCRYPT_ECC=y
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