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* Copyright (c) 2021-2022 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/types.h>
#include <stddef.h>
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/audio/audio.h>
#include <zephyr/sys/byteorder.h>
static void start_scan(void);
static struct bt_conn *default_conn;
static struct k_work_delayable audio_send_work;
static struct bt_audio_unicast_group *unicast_group;
static struct bt_codec *remote_codec_capabilities[CONFIG_BT_AUDIO_UNICAST_CLIENT_PAC_COUNT];
static struct bt_audio_sink {
struct bt_audio_ep *ep;
uint32_t seq_num;
} sinks[CONFIG_BT_AUDIO_UNICAST_CLIENT_ASE_SNK_COUNT];
static struct bt_audio_ep *sources[CONFIG_BT_AUDIO_UNICAST_CLIENT_ASE_SRC_COUNT];
NET_BUF_POOL_FIXED_DEFINE(tx_pool, CONFIG_BT_AUDIO_UNICAST_CLIENT_ASE_SNK_COUNT,
CONFIG_BT_ISO_TX_MTU + BT_ISO_CHAN_SEND_RESERVE,
8, NULL);
static struct bt_audio_stream streams[CONFIG_BT_AUDIO_UNICAST_CLIENT_ASE_SNK_COUNT +
CONFIG_BT_AUDIO_UNICAST_CLIENT_ASE_SRC_COUNT];
static size_t configured_sink_stream_count;
static size_t configured_stream_count;
/* Select a codec configuration to apply that is mandatory to support by both client and server.
* Allows this sample application to work without logic to parse the codec capabilities of the
* server and selection of an appropriate codec configuration.
*/
static struct bt_audio_lc3_preset codec_configuration =
BT_AUDIO_LC3_UNICAST_PRESET_16_2_1(BT_AUDIO_LOCATION_FRONT_LEFT,
BT_AUDIO_CONTEXT_TYPE_UNSPECIFIED);
static K_SEM_DEFINE(sem_connected, 0, 1);
static K_SEM_DEFINE(sem_disconnected, 0, 1);
static K_SEM_DEFINE(sem_mtu_exchanged, 0, 1);
static K_SEM_DEFINE(sem_security_updated, 0, 1);
static K_SEM_DEFINE(sem_sinks_discovered, 0, 1);
static K_SEM_DEFINE(sem_sources_discovered, 0, 1);
static K_SEM_DEFINE(sem_stream_configured, 0, 1);
static K_SEM_DEFINE(sem_stream_qos, 0, 1);
static K_SEM_DEFINE(sem_stream_enabled, 0, 1);
static K_SEM_DEFINE(sem_stream_started, 0, 1);
static uint32_t get_and_incr_seq_num(const struct bt_audio_stream *stream)
{
for (size_t i = 0U; i < configured_sink_stream_count; i++) {
if (stream->ep == sinks[i].ep) {
return sinks[i].seq_num++;
}
}
printk("Could not find endpoint from stream %p\n", stream);
return 0;
}
#if defined(CONFIG_LIBLC3)
#include "lc3.h"
#include "math.h"
#define MAX_SAMPLE_RATE 48000
#define MAX_FRAME_DURATION_US 10000
#define MAX_NUM_SAMPLES ((MAX_FRAME_DURATION_US * MAX_SAMPLE_RATE) / USEC_PER_SEC)
#define AUDIO_VOLUME (INT16_MAX - 3000) /* codec does clipping above INT16_MAX - 3000 */
#define AUDIO_TONE_FREQUENCY_HZ 400
static int16_t audio_buf[MAX_NUM_SAMPLES];
static lc3_encoder_t lc3_encoder;
static lc3_encoder_mem_48k_t lc3_encoder_mem;
static int freq_hz;
static int frame_duration_us;
static int frame_duration_100us;
static int frames_per_sdu;
static int octets_per_frame;
/**
* Use the math lib to generate a sine-wave using 16 bit samples into a buffer.
*
* @param buf Destination buffer
* @param length_us Length of the buffer in microseconds
* @param frequency_hz frequency in Hz
* @param sample_rate_hz sample-rate in Hz.
*/
static void fill_audio_buf_sin(int16_t *buf, int length_us, int frequency_hz, int sample_rate_hz)
{
const int sine_period_samples = sample_rate_hz / frequency_hz;
const unsigned int num_samples = (length_us * sample_rate_hz) / USEC_PER_SEC;
const float step = 2 * 3.1415 / sine_period_samples;
for (unsigned int i = 0; i < num_samples; i++) {
const float sample = sin(i * step);
buf[i] = (int16_t)(AUDIO_VOLUME * sample);
}
}
static void lc3_audio_timer_timeout(struct k_work *work)
{
/* For the first call-back we push multiple audio frames to the buffer to use the
* controller ISO buffer to handle jitter.
*/
const uint8_t prime_count = 2;
static int64_t start_time;
static int32_t sdu_cnt;
int32_t sdu_goal_cnt;
int64_t uptime, run_time_ms, run_time_100us;
k_work_schedule(&audio_send_work, K_USEC(codec_configuration.qos.interval));
if (lc3_encoder == NULL) {
printk("LC3 encoder not setup, cannot encode data.\n");
return;
}
if (start_time == 0) {
/* Read start time and produce the number of frames needed to catch up with any
* inaccuracies in the timer. by calculating the number of frames we should
* have sent and compare to how many were actually sent.
*/
start_time = k_uptime_get();
}
uptime = k_uptime_get();
run_time_ms = uptime - start_time;
/* PDU count calculations done in 100us units to allow 7.5ms framelength in fixed-point */
run_time_100us = run_time_ms * 10;
sdu_goal_cnt = run_time_100us / (frame_duration_100us * frames_per_sdu);
/* Add primer value to ensure the controller do not run low on data due to jitter */
sdu_goal_cnt += prime_count;
printk("LC3 encode %d frames in %d SDUs\n", (sdu_goal_cnt - sdu_cnt) * frames_per_sdu,
(sdu_goal_cnt - sdu_cnt));
while (sdu_cnt < sdu_goal_cnt) {
const uint16_t tx_sdu_len = frames_per_sdu * octets_per_frame;
struct net_buf *buf;
uint8_t *net_buffer;
off_t offset = 0;
buf = net_buf_alloc(&tx_pool, K_FOREVER);
net_buf_reserve(buf, BT_ISO_CHAN_SEND_RESERVE);
net_buffer = net_buf_tail(buf);
buf->len += tx_sdu_len;
for (int i = 0; i < frames_per_sdu; i++) {
int lc3_ret;
lc3_ret = lc3_encode(lc3_encoder, LC3_PCM_FORMAT_S16,
audio_buf, 1, octets_per_frame,
net_buffer + offset);
offset += octets_per_frame;
if (lc3_ret == -1) {
printk("LC3 encoder failed - wrong parameters?: %d",
lc3_ret);
net_buf_unref(buf);
return;
}
}
for (size_t i = 0U; i < configured_sink_stream_count; i++) {
struct bt_audio_stream *stream = &streams[i];
struct net_buf *buf_to_send;
int ret;
/* Clone the buffer if sending on more than 1 stream */
if (i == configured_sink_stream_count - 1) {
buf_to_send = buf;
} else {
buf_to_send = net_buf_clone(buf, K_FOREVER);
}
ret = bt_audio_stream_send(stream, buf_to_send,
get_and_incr_seq_num(stream),
BT_ISO_TIMESTAMP_NONE);
if (ret < 0) {
printk(" Failed to send LC3 audio data on streams[%zu] (%d)\n",
i, ret);
net_buf_unref(buf_to_send);
} else {
printk(" TX LC3 l on streams[%zu]: %zu\n",
tx_sdu_len, i);
sdu_cnt++;
}
}
}
}
static void init_lc3(void)
{
unsigned int num_samples;
freq_hz = bt_codec_cfg_get_freq(&codec_configuration.codec);
frame_duration_us = bt_codec_cfg_get_frame_duration_us(&codec_configuration.codec);
octets_per_frame = bt_codec_cfg_get_octets_per_frame(&codec_configuration.codec);
frames_per_sdu = bt_codec_cfg_get_frame_blocks_per_sdu(&codec_configuration.codec, true);
octets_per_frame = bt_codec_cfg_get_octets_per_frame(&codec_configuration.codec);
if (freq_hz < 0) {
printk("Error: Codec frequency not set, cannot start codec.");
return;
}
if (frame_duration_us < 0) {
printk("Error: Frame duration not set, cannot start codec.");
return;
}
if (octets_per_frame < 0) {
printk("Error: Octets per frame not set, cannot start codec.");
return;
}
frame_duration_100us = frame_duration_us / 100;
/* Fill audio buffer with Sine wave only once and repeat encoding the same tone frame */
fill_audio_buf_sin(audio_buf, frame_duration_us, AUDIO_TONE_FREQUENCY_HZ, freq_hz);
num_samples = ((frame_duration_us * freq_hz) / USEC_PER_SEC);
for (unsigned int i = 0; i < num_samples; i++) {
printk("%3i: %6i\n", i, audio_buf[i]);
}
/* Create the encoder instance. This shall complete before stream_started() is called. */
lc3_encoder = lc3_setup_encoder(frame_duration_us,
freq_hz,
0, /* No resampling */
&lc3_encoder_mem);
if (lc3_encoder == NULL) {
printk("ERROR: Failed to setup LC3 encoder - wrong parameters?\n");
}
}
#else
#define init_lc3(...)
/**
* @brief Send audio data on timeout
*
* This will send an increasing amount of audio data, starting from 1 octet.
* The data is just mock data, and does not actually represent any audio.
*
* First iteration : 0x00
* Second iteration: 0x00 0x01
* Third iteration : 0x00 0x01 0x02
*
* And so on, until it wraps around the configured MTU (CONFIG_BT_ISO_TX_MTU)
*
* @param work Pointer to the work structure
*/
static void audio_timer_timeout(struct k_work *work)
{
static uint8_t buf_data[CONFIG_BT_ISO_TX_MTU];
static bool data_initialized;
struct net_buf *buf;
static size_t len_to_send = 1;
if (!data_initialized) {
/* TODO: Actually encode some audio data */
for (int i = 0; i < ARRAY_SIZE(buf_data); i++) {
buf_data[i] = (uint8_t)i;
}
data_initialized = true;
}
buf = net_buf_alloc(&tx_pool, K_FOREVER);
net_buf_reserve(buf, BT_ISO_CHAN_SEND_RESERVE);
net_buf_add_mem(buf, buf_data, len_to_send);
/* We configured the sink streams to be first in `streams`, so that
* we can use `stream[i]` to select sink streams (i.e. streams with
* data going to the server)
*/
for (size_t i = 0U; i < configured_sink_stream_count; i++) {
struct bt_audio_stream *stream = &streams[i];
struct net_buf *buf_to_send;
int ret;
/* Clone the buffer if sending on more than 1 stream */
if (i == configured_sink_stream_count - 1) {
buf_to_send = buf;
} else {
buf_to_send = net_buf_clone(buf, K_FOREVER);
}
ret = bt_audio_stream_send(stream, buf_to_send,
get_and_incr_seq_num(stream),
BT_ISO_TIMESTAMP_NONE);
if (ret < 0) {
printk("Failed to send audio data on streams[%zu]: (%d)\n",
i, ret);
net_buf_unref(buf_to_send);
} else {
printk("Sending mock data with len %zu on streams[%zu]\n",
len_to_send, i);
}
}
k_work_schedule(&audio_send_work, K_MSEC(1000));
len_to_send++;
if (len_to_send > codec_configuration.qos.sdu) {
len_to_send = 1;
}
}
#endif
static enum bt_audio_dir stream_dir(const struct bt_audio_stream *stream)
{
for (size_t i = 0U; i < ARRAY_SIZE(sinks); i++) {
if (sinks[i].ep != NULL && stream->ep == sinks[i].ep) {
return BT_AUDIO_DIR_SINK;
}
}
for (size_t i = 0U; i < ARRAY_SIZE(sources); i++) {
if (sources[i] != NULL && stream->ep == sources[i]) {
return BT_AUDIO_DIR_SOURCE;
}
}
__ASSERT(false, "Invalid stream");
return 0;
}
static void print_hex(const uint8_t *ptr, size_t len)
{
while (len-- != 0) {
printk("%02x", *ptr++);
}
}
static void print_codec_capabilities(const struct bt_codec *codec)
{
printk("codec 0x%02x cid 0x%04x vid 0x%04x count %u\n",
codec->id, codec->cid, codec->vid, codec->data_count);
for (size_t i = 0; i < codec->data_count; i++) {
printk("data #%zu: type 0x%02x len %u\n",
i, codec->data[i].data.type,
codec->data[i].data.data_len);
print_hex(codec->data[i].data.data,
codec->data[i].data.data_len -
sizeof(codec->data[i].data.type));
printk("\n");
}
for (size_t i = 0; i < codec->meta_count; i++) {
printk("meta #%zu: type 0x%02x len %u\n",
i, codec->meta[i].data.type,
codec->meta[i].data.data_len);
print_hex(codec->meta[i].data.data,
codec->meta[i].data.data_len -
sizeof(codec->meta[i].data.type));
printk("\n");
}
}
static bool check_audio_support_and_connect(struct bt_data *data,
void *user_data)
{
bt_addr_le_t *addr = user_data;
int i;
printk("[AD]: %u data_len %u\n", data->type, data->data_len);
switch (data->type) {
case BT_DATA_UUID16_SOME:
case BT_DATA_UUID16_ALL:
if (data->data_len % sizeof(uint16_t) != 0U) {
printk("AD malformed\n");
return true; /* Continue */
}
for (i = 0; i < data->data_len; i += sizeof(uint16_t)) {
struct bt_uuid *uuid;
uint16_t uuid_val;
int err;
memcpy(&uuid_val, &data->data[i], sizeof(uuid_val));
uuid = BT_UUID_DECLARE_16(sys_le16_to_cpu(uuid_val));
if (bt_uuid_cmp(uuid, BT_UUID_ASCS) != 0) {
continue;
}
err = bt_le_scan_stop();
if (err != 0) {
printk("Failed to stop scan: %d\n", err);
return false;
}
printk("Audio server found; connecting\n");
err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN,
BT_LE_CONN_PARAM_DEFAULT,
&default_conn);
if (err != 0) {
printk("Create conn to failed (%u)\n", err);
start_scan();
}
return false; /* Stop parsing */
}
}
return true;
}
static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
struct net_buf_simple *ad)
{
char addr_str[BT_ADDR_LE_STR_LEN];
if (default_conn != NULL) {
/* Already connected */
return;
}
/* We're only interested in connectable events */
if (type != BT_GAP_ADV_TYPE_ADV_IND &&
type != BT_GAP_ADV_TYPE_ADV_DIRECT_IND &&
type != BT_GAP_ADV_TYPE_EXT_ADV) {
return;
}
(void)bt_addr_le_to_str(addr, addr_str, sizeof(addr_str));
printk("Device found: %s (RSSI %d)\n", addr_str, rssi);
/* connect only to devices in close proximity */
if (rssi < -70) {
return;
}
bt_data_parse(ad, check_audio_support_and_connect, (void *)addr);
}
static void start_scan(void)
{
int err;
/* This demo doesn't require active scan */
err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
if (err != 0) {
printk("Scanning failed to start (err %d)\n", err);
return;
}
printk("Scanning successfully started\n");
}
static void stream_configured(struct bt_audio_stream *stream,
const struct bt_codec_qos_pref *pref)
{
printk("Audio Stream %p configured\n", stream);
k_sem_give(&sem_stream_configured);
}
static void stream_qos_set(struct bt_audio_stream *stream)
{
printk("Audio Stream %p QoS set\n", stream);
k_sem_give(&sem_stream_qos);
}
static void stream_enabled(struct bt_audio_stream *stream)
{
printk("Audio Stream %p enabled\n", stream);
k_sem_give(&sem_stream_enabled);
}
static void stream_started(struct bt_audio_stream *stream)
{
printk("Audio Stream %p started\n", stream);
/* Reset sequence number for sinks */
for (size_t i = 0U; i < configured_sink_stream_count; i++) {
if (stream->ep == sinks[i].ep) {
sinks[i].seq_num = 0U;
break;
}
}
k_sem_give(&sem_stream_started);
}
static void stream_metadata_updated(struct bt_audio_stream *stream)
{
printk("Audio Stream %p metadata updated\n", stream);
}
static void stream_disabled(struct bt_audio_stream *stream)
{
printk("Audio Stream %p disabled\n", stream);
}
static void stream_stopped(struct bt_audio_stream *stream)
{
printk("Audio Stream %p stopped\n", stream);
/* Stop send timer */
k_work_cancel_delayable(&audio_send_work);
}
static void stream_released(struct bt_audio_stream *stream)
{
printk("Audio Stream %p released\n", stream);
}
static void stream_recv(struct bt_audio_stream *stream,
const struct bt_iso_recv_info *info,
struct net_buf *buf)
{
printk("Incoming audio on stream %p len %u\n", stream, buf->len);
}
static struct bt_audio_stream_ops stream_ops = {
.configured = stream_configured,
.qos_set = stream_qos_set,
.enabled = stream_enabled,
.started = stream_started,
.metadata_updated = stream_metadata_updated,
.disabled = stream_disabled,
.stopped = stream_stopped,
.released = stream_released,
.recv = stream_recv
};
static void add_remote_source(struct bt_audio_ep *ep, uint8_t index)
{
printk("Sink #%u: ep %p\n", index, ep);
if (index > ARRAY_SIZE(sources)) {
printk("Could not add source ep[%u]\n", index);
return;
}
sources[index] = ep;
}
static void add_remote_sink(struct bt_audio_ep *ep, uint8_t index)
{
printk("Sink #%u: ep %p\n", index, ep);
if (index > ARRAY_SIZE(sinks)) {
printk("Could not add sink ep[%u]\n", index);
return;
}
sinks[index].ep = ep;
}
static void add_remote_codec(struct bt_codec *codec_capabilities, int index,
enum bt_audio_dir dir)
{
printk("#%u: codec_capabilities %p dir 0x%02x\n",
index, codec_capabilities, dir);
print_codec_capabilities(codec_capabilities);
if (dir != BT_AUDIO_DIR_SINK && dir != BT_AUDIO_DIR_SOURCE) {
return;
}
if (index < CONFIG_BT_AUDIO_UNICAST_CLIENT_PAC_COUNT) {
remote_codec_capabilities[index] = codec_capabilities;
}
}
static void discover_sinks_cb(struct bt_conn *conn,
struct bt_codec *codec,
struct bt_audio_ep *ep,
struct bt_audio_discover_params *params)
{
if (params->err != 0) {
printk("Discovery failed: %d\n", params->err);
return;
}
if (codec != NULL) {
add_remote_codec(codec, params->num_caps, params->dir);
return;
}
if (ep != NULL) {
add_remote_sink(ep, params->num_eps);
return;
}
printk("Discover sinks complete: err %d\n", params->err);
(void)memset(params, 0, sizeof(*params));
k_sem_give(&sem_sinks_discovered);
}
static void discover_sources_cb(struct bt_conn *conn,
struct bt_codec *codec,
struct bt_audio_ep *ep,
struct bt_audio_discover_params *params)
{
if (params->err != 0) {
printk("Discovery failed: %d\n", params->err);
return;
}
if (codec != NULL) {
add_remote_codec(codec, params->num_caps, params->dir);
return;
}
if (ep != NULL) {
add_remote_source(ep, params->num_eps);
return;
}
printk("Discover sources complete: err %d\n", params->err);
(void)memset(params, 0, sizeof(*params));
k_sem_give(&sem_sources_discovered);
}
static void connected(struct bt_conn *conn, uint8_t err)
{
char addr[BT_ADDR_LE_STR_LEN];
(void)bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
if (err != 0) {
printk("Failed to connect to %s (%u)\n", addr, err);
bt_conn_unref(default_conn);
default_conn = NULL;
start_scan();
return;
}
if (conn != default_conn) {
return;
}
printk("Connected: %s\n", addr);
k_sem_give(&sem_connected);
}
static void disconnected(struct bt_conn *conn, uint8_t reason)
{
char addr[BT_ADDR_LE_STR_LEN];
if (conn != default_conn) {
return;
}
(void)bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
printk("Disconnected: %s (reason 0x%02x)\n", addr, reason);
bt_conn_unref(default_conn);
default_conn = NULL;
k_sem_give(&sem_disconnected);
}
static void security_changed_cb(struct bt_conn *conn, bt_security_t level,
enum bt_security_err err)
{
if (err == 0) {
k_sem_give(&sem_security_updated);
} else {
printk("Failed to set security level: %u", err);
}
}
BT_CONN_CB_DEFINE(conn_callbacks) = {
.connected = connected,
.disconnected = disconnected,
.security_changed = security_changed_cb
};
static void att_mtu_updated(struct bt_conn *conn, uint16_t tx, uint16_t rx)
{
printk("MTU exchanged: %u/%u\n", tx, rx);
k_sem_give(&sem_mtu_exchanged);
}
static struct bt_gatt_cb gatt_callbacks = {
.att_mtu_updated = att_mtu_updated,
};
static void unicast_client_location_cb(struct bt_conn *conn,
enum bt_audio_dir dir,
enum bt_audio_location loc)
{
printk("dir %u loc %X\n", dir, loc);
}
static void available_contexts_cb(struct bt_conn *conn,
enum bt_audio_context snk_ctx,
enum bt_audio_context src_ctx)
{
printk("snk ctx %u src ctx %u\n", snk_ctx, src_ctx);
}
const struct bt_audio_unicast_client_cb unicast_client_cbs = {
.location = unicast_client_location_cb,
.available_contexts = available_contexts_cb,
};
static int init(void)
{
int err;
err = bt_enable(NULL);
if (err != 0) {
printk("Bluetooth enable failed (err %d)\n", err);
return err;
}
for (size_t i = 0; i < ARRAY_SIZE(streams); i++) {
streams[i].ops = &stream_ops;
}
bt_gatt_cb_register(&gatt_callbacks);
#if defined(CONFIG_LIBLC3)
k_work_init_delayable(&audio_send_work, lc3_audio_timer_timeout);
#else
k_work_init_delayable(&audio_send_work, audio_timer_timeout);
#endif
return 0;
}
static int scan_and_connect(void)
{
int err;
start_scan();
err = k_sem_take(&sem_connected, K_FOREVER);
if (err != 0) {
printk("failed to take sem_connected (err %d)\n", err);
return err;
}
err = k_sem_take(&sem_mtu_exchanged, K_FOREVER);
if (err != 0) {
printk("failed to take sem_mtu_exchanged (err %d)\n", err);
return err;
}
err = bt_conn_set_security(default_conn, BT_SECURITY_L2);
if (err != 0) {
printk("failed to set security (err %d)\n", err);
return err;
}
err = k_sem_take(&sem_security_updated, K_FOREVER);
if (err != 0) {
printk("failed to take sem_security_updated (err %d)\n", err);
return err;
}
return 0;
}
static int discover_sinks(void)
{
static struct bt_audio_discover_params params;
int err;
params.func = discover_sinks_cb;
params.dir = BT_AUDIO_DIR_SINK;
err = bt_audio_discover(default_conn, ¶ms);
if (err != 0) {
printk("Failed to discover sinks: %d\n", err);
return err;
}
err = k_sem_take(&sem_sinks_discovered, K_FOREVER);
if (err != 0) {
printk("failed to take sem_sinks_discovered (err %d)\n", err);
return err;
}
return 0;
}
static int discover_sources(void)
{
static struct bt_audio_discover_params params;
int err;
params.func = discover_sources_cb;
params.dir = BT_AUDIO_DIR_SOURCE;
err = bt_audio_discover(default_conn, ¶ms);
if (err != 0) {
printk("Failed to discover sources: %d\n", err);
return err;
}
err = k_sem_take(&sem_sources_discovered, K_FOREVER);
if (err != 0) {
printk("failed to take sem_sources_discovered (err %d)\n", err);
return err;
}
return 0;
}
static int configure_stream(struct bt_audio_stream *stream,
struct bt_audio_ep *ep)
{
int err;
err = bt_audio_stream_config(default_conn, stream, ep,
&codec_configuration.codec);
if (err != 0) {
return err;
}
err = k_sem_take(&sem_stream_configured, K_FOREVER);
if (err != 0) {
printk("failed to take sem_stream_configured (err %d)\n", err);
return err;
}
return 0;
}
static int configure_streams(void)
{
int err;
for (size_t i = 0; i < ARRAY_SIZE(sinks); i++) {
struct bt_audio_ep *ep = sinks[i].ep;
struct bt_audio_stream *stream = &streams[i];
if (ep == NULL) {
continue;
}
err = configure_stream(stream, ep);
if (err != 0) {
printk("Could not configure sink stream[%zu]: %d\n",
i, err);
return err;
}
printk("Configured sink stream[%zu]\n", i);
configured_stream_count++;
configured_sink_stream_count++;
}
for (size_t i = 0; i < ARRAY_SIZE(sources); i++) {
struct bt_audio_ep *ep = sources[i];
struct bt_audio_stream *stream = &streams[i + configured_sink_stream_count];
if (ep == NULL) {
continue;
}
err = configure_stream(stream, ep);
if (err != 0) {
printk("Could not configure source stream[%zu]: %d\n",
i, err);
return err;
}
printk("Configured source stream[%zu]\n", i);
configured_stream_count++;
}
return 0;
}
static int create_group(void)
{
struct bt_audio_unicast_group_param params[ARRAY_SIZE(streams)];
int err;
for (size_t i = 0U; i < configured_stream_count; i++) {
params[i].stream = &streams[i];
params[i].qos = &codec_configuration.qos;
params[i].dir = stream_dir(params[i].stream);
}
err = bt_audio_unicast_group_create(params, configured_stream_count,
&unicast_group);
if (err != 0) {
printk("Could not create unicast group (err %d)\n", err);
return err;
}
return 0;
}
static int delete_group(void)
{
int err;
err = bt_audio_unicast_group_delete(unicast_group);
if (err != 0) {
printk("Could not create unicast group (err %d)\n", err);
return err;
}
return 0;
}
static int set_stream_qos(void)
{
int err;
err = bt_audio_stream_qos(default_conn, unicast_group);
if (err != 0) {
printk("Unable to setup QoS: %d\n", err);
return err;
}
err = k_sem_take(&sem_stream_qos, K_FOREVER);
if (err != 0) {
printk("failed to take sem_stream_qos (err %d)\n", err);
return err;
}
return 0;
}
static int enable_streams(void)
{
if (IS_ENABLED(CONFIG_LIBLC3)) {
init_lc3();
}
for (size_t i = 0; i < configured_stream_count; i++) {
int err;
err = bt_audio_stream_enable(&streams[i],
codec_configuration.codec.meta,
codec_configuration.codec.meta_count);
if (err != 0) {
printk("Unable to enable stream: %d\n", err);
return err;
}
err = k_sem_take(&sem_stream_enabled, K_FOREVER);
if (err != 0) {
printk("failed to take sem_stream_enabled (err %d)\n", err);
return err;
}
}
return 0;
}
static int start_streams(void)
{
for (size_t i = 0; i < configured_stream_count; i++) {
int err;
err = bt_audio_stream_start(&streams[i]);
if (err != 0) {
printk("Unable to start stream: %d\n", err);
return err;
}
err = k_sem_take(&sem_stream_started, K_FOREVER);
if (err != 0) {
printk("failed to take sem_stream_started (err %d)\n", err);
return err;
}
}
return 0;
}
static void reset_data(void)
{
k_sem_reset(&sem_connected);
k_sem_reset(&sem_disconnected);
k_sem_reset(&sem_mtu_exchanged);
k_sem_reset(&sem_security_updated);
k_sem_reset(&sem_sinks_discovered);
k_sem_reset(&sem_sources_discovered);
k_sem_reset(&sem_stream_configured);
k_sem_reset(&sem_stream_qos);
k_sem_reset(&sem_stream_enabled);
k_sem_reset(&sem_stream_started);
configured_sink_stream_count = 0;
configured_stream_count = 0;
}
void main(void)
{
int err;
printk("Initializing\n");
err = init();
if (err != 0) {
return;
}
printk("Initialized\n");
err = bt_audio_unicast_client_register_cb(&unicast_client_cbs);
if (err != 0) {
printk("Failed to register client callbacks: %d", err);
return;
}
while (true) {
reset_data();
printk("Waiting for connection\n");
err = scan_and_connect();
if (err != 0) {
return;
}
printk("Connected\n");
printk("Discovering sinks\n");
err = discover_sinks();
if (err != 0) {
return;
}
printk("Sinks discovered\n");
printk("Discovering sources\n");
err = discover_sources();
if (err != 0) {
return;
}
printk("Sources discovered\n");
printk("Configuring streams\n");
err = configure_streams();
if (err != 0) {
return;
}
printk("Stream configured\n");
printk("Creating unicast group\n");
err = create_group();
if (err != 0) {
return;
}
printk("Unicast group created\n");
printk("Setting stream QoS\n");
err = set_stream_qos();
if (err != 0) {
return;
}
printk("Stream QoS Set\n");
printk("Enabling streams\n");
err = enable_streams();
if (err != 0) {
return;
}
printk("Streams enabled\n");
printk("Starting streams\n");
err = start_streams();
if (err != 0) {
return;
}
printk("Streams started\n");
/* Start send timer */
k_work_schedule(&audio_send_work, K_MSEC(0));
/* Wait for disconnect */
err = k_sem_take(&sem_disconnected, K_FOREVER);
if (err != 0) {
printk("failed to take sem_disconnected (err %d)\n", err);
return;
}
printk("Deleting group\n");
err = delete_group();
if (err != 0) {
return;
}
printk("Group deleted\n");
}
}
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