bluetooth: audio: added broadcast source filtering (a8f2dc21) · Commits · Wenxi XU / zephyr

samples/bluetooth/broadcast_audio_sink/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -28,4 +28,11 @@ config SCAN_DELAY
		Time to advertise connectable for a Broadcast Assistant to connect
		before starting scanning for Broadcast Sources.

		config TARGET_BROADCAST_NAME
		string "Target Broadcast Device Name"
		default ""
		help
		Name of target broadcast device. If not empty string, sink device
		will only listen to the specified broadcast source. Not case sensitive.

		source "Kconfig.zephyr"

samples/bluetooth/broadcast_audio_sink/README.rst

+4 −0

Original line number	Diff line number	Diff line
		@@ -23,4 +23,8 @@ This sample can be found under
		Use `-DEXTRA_CONF_FILE=overlay-bt_ll_sw_split.conf` to enable required ISO
		feature support in Zephyr Bluetooth Controller on supported boards.

		Use `CONFIG_TARGET_BROADCAST_NAME` Kconfig to specify the name (CONFIG_BT_DEVICE_NAME)
		of a broadcast source to listen to. With default value (empty string), sink
		device will listen to all available broadcast sources.

		See :ref:`bluetooth samples section <bluetooth-samples>` for details.

samples/bluetooth/broadcast_audio_sink/src/main.c

+62 −1

Original line number	Diff line number	Diff line
		@@ -4,6 +4,9 @@
		* SPDX-License-Identifier: Apache-2.0
		*/

		#include <ctype.h>
		#include <strings.h>

		#include <zephyr/bluetooth/bluetooth.h>
		#include <zephyr/bluetooth/audio/audio.h>
		#include <zephyr/bluetooth/audio/bap.h>
		@@ -25,6 +28,7 @@ BUILD_ASSERT(IS_ENABLED(CONFIG_SCAN_SELF) \|\| IS_ENABLED(CONFIG_SCAN_OFFLOAD),
		#define INVALID_BROADCAST_ID (BT_AUDIO_BROADCAST_ID_MAX + 1)
		#define SYNC_RETRY_COUNT 6 /* similar to retries for connections */
		#define PA_SYNC_SKIP 5
		#define NAME_LEN sizeof(CONFIG_TARGET_BROADCAST_NAME) + 1

		static K_SEM_DEFINE(sem_connected, 0U, 1U);
		static K_SEM_DEFINE(sem_disconnected, 0U, 1U);
		@@ -57,6 +61,7 @@ static struct bt_bap_stream *streams_p[ARRAY_SIZE(streams)];
		static struct bt_conn *broadcast_assistant_conn;
		static struct bt_le_ext_adv *ext_adv;


		static const struct bt_audio_codec_cap codec_cap = BT_AUDIO_CODEC_CAP_LC3(
		BT_AUDIO_CODEC_LC3_FREQ_16KHZ \| BT_AUDIO_CODEC_LC3_FREQ_24KHZ,
		BT_AUDIO_CODEC_LC3_DURATION_10, BT_AUDIO_CODEC_LC3_CHAN_COUNT_SUPPORT(1), 40u, 60u, 1u,
		@@ -444,9 +449,59 @@ static bool scan_check_and_sync_broadcast(struct bt_data data, void user_data)
		return false;
		}

		static bool is_substring(const char substr, const char str)
		{
		const size_t str_len = strlen(str);
		const size_t sub_str_len = strlen(substr);

		if (sub_str_len > str_len) {
		return false;
		}

		for (size_t pos = 0; pos < str_len; pos++) {
		if (tolower(substr[pos]) == tolower(str[pos])) {
		if (pos + sub_str_len > str_len) {
		return false;
		}

		if (strncasecmp(substr, &str[pos], sub_str_len) == 0) {
		return true;
		}
		}
		}

		return false;
		}

		static bool data_cb(struct bt_data data, void user_data)
		{
		char *name = user_data;

		switch (data->type) {
		case BT_DATA_NAME_SHORTENED:
		case BT_DATA_NAME_COMPLETE:
		case BT_DATA_BROADCAST_NAME:
		memcpy(name, data->data, MIN(data->data_len, NAME_LEN - 1));
		return false;
		default:
		return true;
		}
		}

		static void broadcast_scan_recv(const struct bt_le_scan_recv_info info, struct net_buf_simple ad)
		{
		if (info->interval != 0U) {
		/* call to bt_data_parse consumes netbufs so shallow clone for verbose output */
		if (strlen(CONFIG_TARGET_BROADCAST_NAME) > 0U) {
		struct net_buf_simple buf_copy;
		char name[NAME_LEN] = {0};

		net_buf_simple_clone(ad, &buf_copy);
		bt_data_parse(&buf_copy, data_cb, name);
		if (!(is_substring(CONFIG_TARGET_BROADCAST_NAME, name))) {
		return;
		}
		}
		bt_data_parse(ad, scan_check_and_sync_broadcast, (void *)info);
		}
		}
		@@ -735,7 +790,13 @@ int main(void)
		}
		}

		if (strlen(CONFIG_TARGET_BROADCAST_NAME) > 0U) {
		printk("Scanning for broadcast sources containing`"
		CONFIG_TARGET_BROADCAST_NAME "`\n");
		} else {
		printk("Scanning for broadcast sources\n");
		}

		err = bt_le_scan_start(BT_LE_SCAN_ACTIVE, NULL);
		if (err != 0 && err != -EALREADY) {
		printk("Unable to start scan for broadcast sources: %d\n",

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