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Samples: Bluetooth: Add encrypted broadcast audio source

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Add support for supplying a broadcast code to the
broadcast audio sample, which will, if non-empty, encrypt
the broadcast.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>
This commit is contained in:
Emil Gydesen 2024-03-25 18:58:12 +01:00 • committed by Fabio Baltieri
commit 4844dabf3a
2 changed files with 17 additions and 2 deletions
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7
samples/bluetooth/broadcast_audio_source/Kconfig
View file

@ -38,4 +38,11 @@ config USE_USB_AUDIO_INPUT
select USB_DEVICE_AUDIO
select RING_BUFFER
config BROADCAST_CODE
string "The broadcast code (if any) to use for encrypted broadcast"
default ""
help
Setting a non-empty string for this option will encrypt the broadcast using this
string as the broadcast code. The length of the string shall be between 1 and 16 octets.
source "Kconfig.zephyr"

12
samples/bluetooth/broadcast_audio_source/src/main.c
View file

@ -9,6 +9,9 @@
#include <zephyr/bluetooth/audio/bap.h>
#include <zephyr/bluetooth/audio/bap_lc3_preset.h>
BUILD_ASSERT(strlen(CONFIG_BROADCAST_CODE) <= BT_AUDIO_BROADCAST_CODE_SIZE,
"Invalid broadcast code");
/* Zephyr Controller works best while Extended Advertising interval to be a multiple
* of the ISO Interval minus 10 ms (max. advertising random delay). This is
* required to place the AUX_ADV_IND PDUs in a non-overlapping interval with the
@ -384,7 +387,7 @@ static int setup_broadcast_source(struct bt_bap_broadcast_source **source)
stream_params[CONFIG_BT_BAP_BROADCAST_SRC_STREAM_COUNT];
struct bt_bap_broadcast_source_subgroup_param
subgroup_param[CONFIG_BT_BAP_BROADCAST_SRC_SUBGROUP_COUNT];
struct bt_bap_broadcast_source_param create_param;
struct bt_bap_broadcast_source_param create_param = {0};
const size_t streams_per_subgroup = ARRAY_SIZE(stream_params) / ARRAY_SIZE(subgroup_param);
uint8_t left[] = {BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CFG_CHAN_ALLOC,
BT_BYTES_LIST_LE32(BT_AUDIO_LOCATION_FRONT_LEFT))};
@ -408,9 +411,14 @@ static int setup_broadcast_source(struct bt_bap_broadcast_source **source)
create_param.params_count = ARRAY_SIZE(subgroup_param);
create_param.params = subgroup_param;
create_param.qos = &preset_active.qos;
create_param.encryption = false;
create_param.encryption = strlen(CONFIG_BROADCAST_CODE) > 0;
create_param.packing = BT_ISO_PACKING_SEQUENTIAL;
if (create_param.encryption) {
memcpy(create_param.broadcast_code, CONFIG_BROADCAST_CODE,
strlen(CONFIG_BROADCAST_CODE));
}
printk("Creating broadcast source with %zu subgroups with %zu streams\n",
ARRAY_SIZE(subgroup_param),
ARRAY_SIZE(subgroup_param) * streams_per_subgroup);