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btstack/test/le_audio/le_audio_broadcast_source.c
Matthias Ringwald 10277393e9 test/le_audio: add le audio broadcast sink + source tests
2022-03-23 14:35:21 +01:00

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/*
* Copyright (C) 2022 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define BTSTACK_FILE__ "le_audio_broadcast_source.c"
/*
* LE Audio Broadcast Source
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <btstack_debug.h>
#include "bluetooth_data_types.h"
#include "btstack_stdin.h"
#include "btstack_event.h"
#include "btstack_run_loop.h"
#include "gap.h"
#include "hci.h"
#include "hci_cmd.h"
#include "hci_dump.h"
#include "lc3.h"
#include "lc3_ehima.h"
#include "hxcmod.h"
#include "mods/mod.h"
// PTS mode
// #define PTS_MODE
// Count mode - send packet count as test data for manual analysis
// #define COUNT_MODE
// create audio based on timer instead of num completed packets
// #define GENERATE_AUDIO_WITH_TIMER
// max config
#define MAX_NUM_BIS 2
#define MAX_SAMPLES_PER_FRAME 480
static const uint8_t adv_sid = 0;
static le_advertising_set_t le_advertising_set;
static const le_extended_advertising_parameters_t extended_params = {
.advertising_event_properties = 0,
.primary_advertising_interval_min = 0x4b0, // 750 ms
.primary_advertising_interval_max = 0x4b0, // 750 ms
.primary_advertising_channel_map = 7,
.own_address_type = 0,
.peer_address_type = 0,
.peer_address = 0,
.advertising_filter_policy = 0,
.advertising_tx_power = 10, // 10 dBm
.primary_advertising_phy = 1, // LE 1M PHY
.secondary_advertising_max_skip = 0,
.secondary_advertising_phy = 1, // LE 1M PHY
.advertising_sid = adv_sid,
.scan_request_notification_enable = 0,
};
static const uint8_t extended_adv_data[] = {
// 16 bit service data, ORG_BLUETOOTH_SERVICE_BASIC_AUDIO_ANNOUNCEMENT_SERVICE, Broadcast ID
6, BLUETOOTH_DATA_TYPE_SERVICE_DATA_16_BIT_UUID, 0x52, 0x18, 0x30, 0x5d, 0x9b,
// name
#ifdef PTS_MODE
7, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'P', 'T', 'S', '-', 'x', 'x'
#elif defined(COUNT_MODE)
6, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'C', 'O', 'U', 'N', 'T'
#else
7, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'S', 'o', 'u', 'r', 'c', 'e'
#endif
};
static const le_periodic_advertising_parameters_t periodic_params = {
.periodic_advertising_interval_min = 0x258, // 375 ms
.periodic_advertising_interval_max = 0x258, // 375 ms
.periodic_advertising_properties = 0
};
static uint8_t periodic_adv_data_1[] = {
// 16 bit service data
37, BLUETOOTH_DATA_TYPE_SERVICE_DATA_16_BIT_UUID,
// Level 1 - BIG Parameters (common to all BISes)
0x51, 0x18, // Basic Audio Announcement Service UUID
0x28, 0x00, 0x00, // Presentation Delay 3
0x01, // Num_Subgroups
// Level 2 - BIS Subgroup Parameters (common parameters for subgroups of BISes)
// offset 8
0x01, // The number of BISes in this subgroup
0x06, 0x00, 0x00, 0x00, 0x00, // 0x06 = LC3, vendor id + codec id = 0
10, // Codec_Specific_Configuration_Length[i]
// Codec_Specific_Configuration[i] = 8_2
// offset 15
0x02, 0x01, 0x01, // Sampling frequency 0x01 = 0x01 / 8 kHz
0x02, 0x02, 0x01, // Frame Duration 0x02 = 0x01 / 10 ms
0x03, 0x04, 0x1E, 0x00, // Octets per Frame 0x04 = 0x1e / 30
4, // Metadata_Length[i]
0x03, 0x02, 0x04, 0x00, // Metadata[i]
// Level 3 - Specific BIS Parameters (if required, for individual BISes)
0x01, // BIS_index[i[k]]
6, // Codec_Specific_Configuration_Length[i[k]]
0x05, 0x03, 0x01, 0x00, 0x00, 0x00 // Codec_Specific_Configuration[i[k]]
};
static uint8_t periodic_adv_data_2[] = {
// 16 bit service data
37+8, BLUETOOTH_DATA_TYPE_SERVICE_DATA_16_BIT_UUID,
// Level 1 - BIG Parameters (common to all BISes)
0x51, 0x18, // Basic Audio Announcement Service UUID
0x28, 0x00, 0x00, // Presentation Delay 3
0x01, // Num_Subgroups
// Level 2 - BIS Subgroup Parameters (common parameters for subgroups of BISes)
// offset 8
0x02, // The number of BISes in this subgroup
0x06, 0x00, 0x00, 0x00, 0x00, // 0x06 = LC3, vendor id + codec id = 0
10, // Codec_Specific_Configuration_Length[i]
// Codec_Specific_Configuration[0] = 8_2
// offset 15
0x02, 0x01, 0x01, // Sampling frequency 0x01 = 0x01 / 8 kHz
0x02, 0x02, 0x01, // Frame Duration 0x02 = 0x01 / 10 ms
0x03, 0x04, 0x1E, 0x00, // Octets per Frame 0x04 = 0x1e / 30
4, // Metadata_Length[i]
0x03, 0x02, 0x04, 0x00, // Metadata[0]
// Level 3 - Specific BIS Parameters (if required, for individual BISes)
0x01, // BIS_index[i[k]]
6, // Codec_Specific_Configuration_Length[i[k]]
0x05, 0x03, 0x01, 0x00, 0x00, 0x00, // Codec_Specific_Configuration[i[k]]
// Level 3 - Specific BIS Parameters (if required, for individual BISes)
0x02, // BIS_index[i[k]]
6, // Codec_Specific_Configuration_Length[i[k]]
0x05, 0x03, 0x02, 0x00, 0x00, 0x00 // Codec_Specific_Configuration[i[k]]
};
// input signal: pre-computed int16 sine wave, 96000 Hz at 300 Hz
static const int16_t sine_int16[] = {
0, 643, 1286, 1929, 2571, 3212, 3851, 4489, 5126, 5760,
6393, 7022, 7649, 8273, 8894, 9512, 10126, 10735, 11341, 11943,
12539, 13131, 13718, 14300, 14876, 15446, 16011, 16569, 17121, 17666,
18204, 18736, 19260, 19777, 20286, 20787, 21280, 21766, 22242, 22710,
23170, 23620, 24062, 24494, 24916, 25329, 25732, 26126, 26509, 26882,
27245, 27597, 27938, 28269, 28589, 28898, 29196, 29482, 29757, 30021,
30273, 30513, 30742, 30958, 31163, 31356, 31537, 31705, 31862, 32006,
32137, 32257, 32364, 32458, 32540, 32609, 32666, 32710, 32742, 32761,
32767, 32761, 32742, 32710, 32666, 32609, 32540, 32458, 32364, 32257,
32137, 32006, 31862, 31705, 31537, 31356, 31163, 30958, 30742, 30513,
30273, 30021, 29757, 29482, 29196, 28898, 28589, 28269, 27938, 27597,
27245, 26882, 26509, 26126, 25732, 25329, 24916, 24494, 24062, 23620,
23170, 22710, 22242, 21766, 21280, 20787, 20286, 19777, 19260, 18736,
18204, 17666, 17121, 16569, 16011, 15446, 14876, 14300, 13718, 13131,
12539, 11943, 11341, 10735, 10126, 9512, 8894, 8273, 7649, 7022,
6393, 5760, 5126, 4489, 3851, 3212, 2571, 1929, 1286, 643,
0, -643, -1286, -1929, -2571, -3212, -3851, -4489, -5126, -5760,
-6393, -7022, -7649, -8273, -8894, -9512, -10126, -10735, -11341, -11943,
-12539, -13131, -13718, -14300, -14876, -15446, -16011, -16569, -17121, -17666,
-18204, -18736, -19260, -19777, -20286, -20787, -21280, -21766, -22242, -22710,
-23170, -23620, -24062, -24494, -24916, -25329, -25732, -26126, -26509, -26882,
-27245, -27597, -27938, -28269, -28589, -28898, -29196, -29482, -29757, -30021,
-30273, -30513, -30742, -30958, -31163, -31356, -31537, -31705, -31862, -32006,
-32137, -32257, -32364, -32458, -32540, -32609, -32666, -32710, -32742, -32761,
-32767, -32761, -32742, -32710, -32666, -32609, -32540, -32458, -32364, -32257,
-32137, -32006, -31862, -31705, -31537, -31356, -31163, -30958, -30742, -30513,
-30273, -30021, -29757, -29482, -29196, -28898, -28589, -28269, -27938, -27597,
-27245, -26882, -26509, -26126, -25732, -25329, -24916, -24494, -24062, -23620,
-23170, -22710, -22242, -21766, -21280, -20787, -20286, -19777, -19260, -18736,
-18204, -17666, -17121, -16569, -16011, -15446, -14876, -14300, -13718, -13131,
-12539, -11943, -11341, -10735, -10126, -9512, -8894, -8273, -7649, -7022,
-6393, -5760, -5126, -4489, -3851, -3212, -2571, -1929, -1286, -643,
};
static bd_addr_t remote;
static const char * remote_addr_string = "00:1B:DC:08:E2:72";
static btstack_packet_callback_registration_t hci_event_callback_registration;
static uint8_t adv_handle = 0;
static unsigned int next_bis_index;
static hci_con_handle_t bis_con_handles[MAX_NUM_BIS];
static uint16_t packet_sequence_numbers[MAX_NUM_BIS];
static uint8_t framed_pdus;
static bool bis_can_send[MAX_NUM_BIS];
static bool bis_has_data[MAX_NUM_BIS];
static uint8_t iso_frame_counter;
static uint16_t frame_duration_us;
// time stamping
#ifdef COUNT_MODE
#define MAX_PACKET_INTERVAL_BINS_MS 50
static uint32_t send_time_bins[MAX_PACKET_INTERVAL_BINS_MS];
static uint32_t send_last_ms;
#endif
// time based sender
#ifdef GENERATE_AUDIO_WITH_TIMER
static uint32_t next_send_time_ms;
static uint32_t next_send_time_additional_us;
static btstack_timer_source_t send_timer;
#endif
// lc3 codec config
static uint32_t sampling_frequency_hz;
static lc3_frame_duration_t frame_duration;
static uint16_t number_samples_per_frame;
static uint16_t octets_per_frame;
static uint8_t num_bis = 1;
// lc3 encoder
static const lc3_encoder_t * lc3_encoder;
static lc3_encoder_ehima_t encoder_contexts[MAX_NUM_BIS];
static int16_t pcm[MAX_NUM_BIS * MAX_SAMPLES_PER_FRAME];
static uint32_t time_generation_ms;
// codec menu
static uint8_t menu_sampling_frequency;
static uint8_t menu_variant;
// mod player
static int hxcmod_initialized;
static modcontext mod_context;
static tracker_buffer_state trkbuf;
static int16_t mod_pcm[MAX_NUM_BIS * MAX_SAMPLES_PER_FRAME];
// sine generator
static uint8_t sine_step;
static uint16_t sine_phases[MAX_NUM_BIS];
// audio producer
static enum {
AUDIO_SOURCE_SINE,
AUDIO_SOURCE_MODPLAYER
} audio_source = AUDIO_SOURCE_MODPLAYER;
static enum {
APP_IDLE,
APP_W4_PERIODIC_ENABLED,
APP_CREATE_BIG,
APP_W4_CREATE_BIG_COMPLETE,
APP_SET_ISO_PATH,
APP_STREAMING
} app_state = APP_IDLE;
// enumerate default codec configs
static struct {
uint32_t samplingrate_hz;
uint8_t samplingrate_index;
uint8_t num_variants;
struct {
const char * name;
lc3_frame_duration_t frame_duration;
uint16_t octets_per_frame;
} variants[6];
} codec_configurations[] = {
{
8000, 0x01, 2,
{
{ "8_1", LC3_FRAME_DURATION_7500US, 26},
{ "8_2", LC3_FRAME_DURATION_10000US, 30}
}
},
{
16000, 0x03, 2,
{
{ "16_1", LC3_FRAME_DURATION_7500US, 30},
{ "16_2", LC3_FRAME_DURATION_10000US, 40}
}
},
{
24000, 0x05, 2,
{
{ "24_1", LC3_FRAME_DURATION_7500US, 45},
{ "24_2", LC3_FRAME_DURATION_10000US, 60}
}
},
{
32000, 0x06, 2,
{
{ "32_1", LC3_FRAME_DURATION_7500US, 60},
{ "32_2", LC3_FRAME_DURATION_10000US, 80}
}
},
{
44100, 0x07, 2,
{
{ "441_1", LC3_FRAME_DURATION_7500US, 97},
{ "441_2", LC3_FRAME_DURATION_10000US, 130}
}
},
{
48000, 0x08, 6,
{
{ "48_1", LC3_FRAME_DURATION_7500US, 75},
{ "48_2", LC3_FRAME_DURATION_10000US, 100},
{ "48_3", LC3_FRAME_DURATION_7500US, 90},
{ "48_4", LC3_FRAME_DURATION_10000US, 120},
{ "48_5", LC3_FRAME_DURATION_7500US, 117},
{ "48_6", LC3_FRAME_DURATION_10000US, 155}
}
},
};
static void show_usage(void);
static void print_config(void) {
printf("Config '%s_%u': %u, %s ms, %u octets - %s\n",
codec_configurations[menu_sampling_frequency].variants[menu_variant].name,
num_bis,
codec_configurations[menu_sampling_frequency].samplingrate_hz,
codec_configurations[menu_sampling_frequency].variants[menu_variant].frame_duration == LC3_FRAME_DURATION_7500US ? "7.5" : "10",
codec_configurations[menu_sampling_frequency].variants[menu_variant].octets_per_frame,
audio_source == AUDIO_SOURCE_SINE ? "Sine" : "Modplayer");
}
static void setup_lc3_encoder(void){
uint8_t channel;
for (channel = 0 ; channel < num_bis ; channel++){
lc3_encoder_ehima_t * context = &encoder_contexts[channel];
lc3_encoder = lc3_encoder_ehima_init_instance(context);
lc3_encoder->configure(context, sampling_frequency_hz, frame_duration);
}
number_samples_per_frame = lc3_encoder->get_number_samples_per_frame(&encoder_contexts[0]);
btstack_assert(number_samples_per_frame <= MAX_SAMPLES_PER_FRAME);
printf("LC3 Encoder config: %u hz, frame duration %s ms, num samples %u, num octets %u\n",
sampling_frequency_hz, frame_duration == LC3_FRAME_DURATION_7500US ? "7.5" : "10",
number_samples_per_frame, octets_per_frame);
}
static void setup_mod_player(void){
if (!hxcmod_initialized) {
hxcmod_initialized = hxcmod_init(&mod_context);
btstack_assert(hxcmod_initialized != 0);
}
hxcmod_unload(&mod_context);
hxcmod_setcfg(&mod_context, sampling_frequency_hz, 16, 1, 1, 1);
hxcmod_load(&mod_context, (void *) &mod_data, mod_len);
}
static void generate_audio(void){
uint32_t start_ms = btstack_run_loop_get_time_ms();
uint16_t sample;
switch (audio_source) {
case AUDIO_SOURCE_SINE:
// generate sine wave for all channels
for (sample = 0 ; sample < number_samples_per_frame ; sample++){
uint8_t channel;
for (channel = 0; channel < num_bis; channel++) {
int16_t value = sine_int16[sine_phases[channel]] / 4;
pcm[channel * MAX_SAMPLES_PER_FRAME + sample] = value;
sine_phases[channel] += sine_step * (1+channel); // second channel, double frequency
if (sine_phases[channel] >= (sizeof(sine_int16) / sizeof(int16_t))) {
sine_phases[channel] = 0;
}
}
}
break;
case AUDIO_SOURCE_MODPLAYER:
// mod player configured for stereo
hxcmod_fillbuffer(&mod_context, (unsigned short *) &mod_pcm[0], number_samples_per_frame, &trkbuf);
uint16_t i;
if (num_bis == 1){
// stereo -> mono
for (i=0;i<number_samples_per_frame;i++){
pcm[i] = (mod_pcm[2*i] / 2) + (mod_pcm[2*i+1] / 2);
}
} else {
// sort interleaved samples
for (i=0;i<number_samples_per_frame;i++){
pcm[i] = mod_pcm[2*i];
pcm[MAX_SAMPLES_PER_FRAME+i] = mod_pcm[2*i+1];
}
}
break;
default:
btstack_unreachable();
break;
}
time_generation_ms = btstack_run_loop_get_time_ms() - start_ms;
iso_frame_counter++;
}
static void encode_and_send(uint8_t bis_index){
#ifdef COUNT_MODE
if (bis_index == 0) {
uint32_t now = btstack_run_loop_get_time_ms();
if (send_last_ms != 0) {
uint16_t send_interval_ms = now - send_last_ms;
if (send_interval_ms >= MAX_PACKET_INTERVAL_BINS_MS) {
printf("ERROR: send interval %u\n", send_interval_ms);
} else {
send_time_bins[send_interval_ms]++;
}
}
send_last_ms = now;
}
#endif
bool ok = hci_reserve_packet_buffer();
btstack_assert(ok);
uint8_t * buffer = hci_get_outgoing_packet_buffer();
// complete SDU, no TimeStamp
little_endian_store_16(buffer, 0, bis_con_handles[bis_index] | (2 << 12));
// len
little_endian_store_16(buffer, 2, 0 + 4 + octets_per_frame);
// TimeStamp if TS flag is set
// packet seq nr
little_endian_store_16(buffer, 4, packet_sequence_numbers[bis_index]);
// iso sdu len
little_endian_store_16(buffer, 6, octets_per_frame);
#ifdef COUNT_MODE
// test data: bis_index, counter
buffer[8] = bis_index;
memset(&buffer[9], iso_frame_counter, octets_per_frame - 1);
#else
// encode as lc3
lc3_encoder->encode(&encoder_contexts[bis_index], &pcm[bis_index * MAX_SAMPLES_PER_FRAME], &buffer[8], octets_per_frame);
#endif
// send
hci_send_iso_packet_buffer(4 + 0 + 4 + octets_per_frame);
if (((packet_sequence_numbers[bis_index] & 0x7f) == 0) && (bis_index == 0)) {
printf("Encoding time: %u\n", time_generation_ms);
}
if ((packet_sequence_numbers[bis_index] & 0x7c) == 0){
printf("%04x %10u %u ", packet_sequence_numbers[bis_index], btstack_run_loop_get_time_ms(), bis_index);
printf_hexdump(&buffer[8], octets_per_frame);
}
packet_sequence_numbers[bis_index]++;
}
static void try_send(void){
bool all_can_send = true;
uint8_t i;
for (i=0; i<num_bis;i++) {
all_can_send &= bis_can_send[i];
}
#ifdef PTS_MODE
static uint8_t next_sender;
// PTS 8.2 sends a packet after the previous one was received -> it sends at half speed for stereo configuration
if (all_can_send) {
if (next_sender == 0) {
generate_audio();
}
bis_can_send[next_sender] = false;
encode_and_send(next_sender);
next_sender = (num_bis - 1) - next_sender;
}
#else
#ifdef GENERATE_AUDIO_WITH_TIMER
for (i=0;i<num_bis;i++){
if (hci_is_packet_buffer_reserved()) return;
if (bis_has_data[i]){
bis_can_send[i] = false;
bis_has_data[i] = false;
encode_and_send(i);
return;
}
}
#else
// check if next audio frame should be produced and send
if (all_can_send){
generate_audio();
for (i=0; i<num_bis;i++) {
bis_has_data[i] = true;
}
}
for (i=0;i<num_bis;i++){
if (hci_is_packet_buffer_reserved()) return;
if (bis_can_send[i] && bis_has_data[i]){
bis_can_send[i] = false;
bis_has_data[i] = false;
encode_and_send(i);
return;
}
}
#endif
#endif
}
#ifdef GENERATE_AUDIO_WITH_TIMER
static void generate_audio_timer_handler(btstack_timer_source_t *ts){
generate_audio();
uint8_t i;
for (i=0; i<num_bis;i++) {
bis_has_data[i] = true;
}
// next send time based on frame_duration_us
next_send_time_additional_us += frame_duration_us % 1000;
if (next_send_time_additional_us > 1000){
next_send_time_ms++;
next_send_time_additional_us -= 1000;
}
next_send_time_ms += frame_duration_us / 1000;
uint32_t now = btstack_run_loop_get_time_ms();
btstack_run_loop_set_timer(&send_timer, next_send_time_ms - now);
btstack_run_loop_add_timer(&send_timer);
try_send();
}
#endif
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
if (packet_type != HCI_EVENT_PACKET) return;
switch (packet[0]) {
case BTSTACK_EVENT_STATE:
switch(btstack_event_state_get_state(packet)) {
case HCI_STATE_WORKING:
show_usage();
printf("Please select sample frequency and variation, then start broadcast\n");
break;
case HCI_STATE_OFF:
printf("Goodbye\n");
exit(0);
break;
default:
break;
}
break;
case HCI_EVENT_COMMAND_COMPLETE:
switch (hci_event_command_complete_get_command_opcode(packet)){
case HCI_OPCODE_HCI_LE_SET_PERIODIC_ADVERTISING_ENABLE:
if (app_state != APP_W4_PERIODIC_ENABLED) break;
app_state = APP_CREATE_BIG;
break;
case HCI_OPCODE_HCI_LE_SETUP_ISO_DATA_PATH:
next_bis_index++;
if (next_bis_index == num_bis){
printf("%u ISO path(s) set up\n", num_bis);
// ready to send
uint8_t i;
for (i=0;i<num_bis;i++) {
bis_can_send[i] = true;
}
app_state = APP_STREAMING;
//
#ifdef GENERATE_AUDIO_WITH_TIMER
btstack_run_loop_set_timer_handler(&send_timer, &generate_audio_timer_handler);
uint32_t next_send_time_ms = btstack_run_loop_get_time_ms() + 10;
uint32_t now = btstack_run_loop_get_time_ms();
btstack_run_loop_set_timer(&send_timer, next_send_time_ms - now);
btstack_run_loop_add_timer(&send_timer);
#endif
}
break;
}
break;
case HCI_EVENT_LE_META:
switch(hci_event_le_meta_get_subevent_code(packet)){
case HCI_SUBEVENT_LE_CREATE_BIG_COMPLETE:
if (app_state == APP_W4_CREATE_BIG_COMPLETE){
uint8_t i;
printf("BIS Connection Handles: ");
for (i=0;i<num_bis;i++){
bis_con_handles[i] = little_endian_read_16(packet, 21 + 2*i);
printf("0x%04x ", bis_con_handles[i]);
}
printf("\n");
next_bis_index = 0;
app_state = APP_SET_ISO_PATH;
printf("Start streaming\n");
}
break;
default:
break;
}
break;
case HCI_EVENT_NUMBER_OF_COMPLETED_PACKETS:
if (size >= 3){
uint16_t num_handles = packet[2];
if (size != (3u + num_handles * 4u)) break;
uint16_t offset = 3;
uint16_t i;
for (i=0; i<num_handles;i++) {
hci_con_handle_t handle = little_endian_read_16(packet, offset) & 0x0fffu;
offset += 2u;
uint16_t num_packets = little_endian_read_16(packet, offset);
offset += 2u;
uint8_t j;
for (j=0 ; j<num_bis ; j++){
if (handle == bis_con_handles[j]){
// allow to send
bis_can_send[j] = true;
}
}
}
}
break;
default:
break;
}
const uint8_t broadcast_code[16] = { 0 };
switch(app_state){
case APP_CREATE_BIG:
if (hci_can_send_command_packet_now()) {
app_state = APP_W4_CREATE_BIG_COMPLETE;
if (sampling_frequency_hz == 44100){
framed_pdus = 1;
// same config as for 48k -> frame is longer by 48/44.1
frame_duration_us = frame_duration == LC3_FRAME_DURATION_7500US ? 8163 : 10884;
} else {
framed_pdus = 0;
frame_duration_us = frame_duration == LC3_FRAME_DURATION_7500US ? 7500 : 10000;
}
hci_send_cmd(&hci_le_create_big, 0, adv_handle, num_bis, frame_duration_us, octets_per_frame, 0x1F, 2, 2, 0, framed_pdus, 0, broadcast_code);
}
break;
case APP_SET_ISO_PATH:
if (!hci_can_send_command_packet_now()) break;
hci_send_cmd(&hci_le_setup_iso_data_path, bis_con_handles[next_bis_index], 0, 0, 0, 0, 0, 0, 0, NULL);
break;
default:
break;
}
try_send();
}
static void show_usage(void){
printf("\n--- LE Audio Broadcast Source Test Console ---\n");
print_config();
printf("---\n");
printf("c - toggle channels\n");
printf("f - next sampling frequency\n");
printf("v - next codec variant\n");
printf("t - toggle sine / modplayer\n");
printf("s - start broadcast\n");
printf("x - shutdown\n");
printf("---\n");
}
static void stdin_process(char c){
switch (c){
case 'c':
if (app_state != APP_IDLE){
printf("Codec configuration can only be changed in idle state\n");
break;
}
num_bis = 3 - num_bis;
print_config();
break;
case 'f':
if (app_state != APP_IDLE){
printf("Codec configuration can only be changed in idle state\n");
break;
}
menu_sampling_frequency++;
if (menu_sampling_frequency >= 6){
menu_sampling_frequency = 0;
}
if (menu_variant >= codec_configurations[menu_sampling_frequency].num_variants){
menu_variant = 0;
}
print_config();
break;
case 'v':
if (app_state != APP_IDLE){
printf("Codec configuration can only be changed in idle state\n");
break;
}
menu_variant++;
if (menu_variant >= codec_configurations[menu_sampling_frequency].num_variants){
menu_variant = 0;
}
print_config();
break;
case 'x':
#ifdef COUNT_MODE
printf("Send statistic:\n");
{
uint16_t i;
for (i=0;i<MAX_PACKET_INTERVAL_BINS_MS;i++){
printf("%2u: %5u\n", i, send_time_bins[i]);
}
}
#endif
printf("Shutdown...\n");
hci_power_control(HCI_POWER_OFF);
break;
case 's':
if (app_state != APP_IDLE){
printf("Cannot start broadcast - not in idle state\n");
break;
}
// use values from table
sampling_frequency_hz = codec_configurations[menu_sampling_frequency].samplingrate_hz;
octets_per_frame = codec_configurations[menu_sampling_frequency].variants[menu_variant].octets_per_frame;
frame_duration = codec_configurations[menu_sampling_frequency].variants[menu_variant].frame_duration;
// get num samples per frame
setup_lc3_encoder();
// update BASEs
periodic_adv_data_1[17] = codec_configurations[menu_sampling_frequency].samplingrate_index;
periodic_adv_data_1[20] = (frame_duration == LC3_FRAME_DURATION_7500US) ? 0 : 1;
little_endian_store_16(periodic_adv_data_1, 23, octets_per_frame);
periodic_adv_data_2[17] = codec_configurations[menu_sampling_frequency].samplingrate_index;
periodic_adv_data_2[20] = (frame_duration == LC3_FRAME_DURATION_7500US) ? 0 : 1;
little_endian_store_16(periodic_adv_data_2, 23, octets_per_frame);
// setup mod player
setup_mod_player();
// setup sine generator
if (sampling_frequency_hz == 44100){
sine_step = 2;
} else {
sine_step = 96000 / sampling_frequency_hz;
}
// setup
app_state = APP_W4_PERIODIC_ENABLED;
gap_extended_advertising_setup(&le_advertising_set, &extended_params, &adv_handle);
gap_extended_advertising_set_adv_data(adv_handle, sizeof(extended_adv_data), extended_adv_data);
gap_periodic_advertising_set_params(adv_handle, &periodic_params);
switch(num_bis){
case 1:
gap_periodic_advertising_set_data(adv_handle, sizeof(periodic_adv_data_1), periodic_adv_data_1);
printf("BASE: ");
printf_hexdump(periodic_adv_data_1, sizeof(periodic_adv_data_1));
break;
case 2:
gap_periodic_advertising_set_data(adv_handle, sizeof(periodic_adv_data_2), periodic_adv_data_2);
printf("BASE: ");
printf_hexdump(periodic_adv_data_2, sizeof(periodic_adv_data_2));
break;
default:
btstack_unreachable();
break;
}
gap_periodic_advertising_start(adv_handle, 0);
gap_extended_advertising_start(adv_handle, 0, 0);
break;
case 't':
audio_source = 1 - audio_source;
print_config();
break;
case '\n':
case '\r':
break;
default:
show_usage();
break;
}
}
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
(void) argv;
(void) argc;
// register for HCI events
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// turn on!
hci_power_control(HCI_POWER_ON);
btstack_stdin_setup(stdin_process);
return 0;
}
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