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btstack/test/le_audio/le_audio_unicast_source.c

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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 BLUEKITCHEN
* GMBH 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_unicast_source.c"
/*
* LE Audio Unicast Source
* Until GATT Services are available, we encode LC3 config in advertising
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <btstack_debug.h>
#include "bluetooth_data_types.h"
#include "bluetooth_company_id.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 "btstack_lc3.h"
#include "btstack_lc3_google.h"
#include "hxcmod.h"
#include "mods/mod.h"
// max config
#define MAX_CHANNELS 2
#define MAX_NUM_CIS 1
#define MAX_SAMPLES_PER_FRAME 480
#define MAX_LC3_FRAME_BYTES 155
static uint8_t adv_data[] = {
// Manufacturer Specific Data to indicate codec
9,
BLUETOOTH_DATA_TYPE_MANUFACTURER_SPECIFIC_DATA,
BLUETOOTH_COMPANY_ID_BLUEKITCHEN_GMBH & 0xff,
BLUETOOTH_COMPANY_ID_BLUEKITCHEN_GMBH >> 8,
0, // subtype: LE Audio Connection Source
0, // flags
1, // num bis
8, // sampling frequency in khz
0, // frame duration
26, // octets per frame
// name
7, BLUETOOTH_DATA_TYPE_COMPLETE_LOCAL_NAME, 'S', 'o', 'u', 'r', 'c', 'e'
};
// 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 hci_con_handle_t remote_handle;
static btstack_packet_callback_registration_t hci_event_callback_registration;
static unsigned int next_cis_index;
static hci_con_handle_t cis_con_handles[MAX_NUM_CIS];
static uint16_t packet_sequence_numbers[MAX_NUM_CIS];
static uint8_t framed_pdus;
static bool cis_established[MAX_NUM_CIS];
static uint8_t iso_frame_counter;
static uint16_t frame_duration_us;
static uint8_t num_cis;
static uint8_t iso_payload[MAX_CHANNELS * MAX_LC3_FRAME_BYTES];
// 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
// lc3 codec config
static uint32_t sampling_frequency_hz;
static btstack_lc3_frame_duration_t frame_duration;
static uint16_t number_samples_per_frame;
static uint16_t octets_per_frame;
static uint8_t num_channels = 1;
// lc3 encoder
static const btstack_lc3_encoder_t * lc3_encoder;
static btstack_lc3_encoder_google_t encoder_contexts[MAX_CHANNELS];
static int16_t pcm[MAX_CHANNELS * 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;
// sine generator
static uint8_t sine_step;
static uint16_t sine_phases[MAX_CHANNELS];
// audio producer
static enum {
AUDIO_SOURCE_SINE,
AUDIO_SOURCE_MODPLAYER
} audio_source = AUDIO_SOURCE_MODPLAYER;
static enum {
APP_W4_WORKING,
APP_IDLE,
APP_W4_CIS_COMPLETE,
APP_STREAMING,
APP_W4_POWER_OFF,
} app_state = APP_W4_WORKING;
// enumerate default codec configs
static struct {
uint16_t samplingrate_hz;
uint8_t samplingrate_index;
uint8_t num_variants;
struct {
const char * name;
btstack_lc3_frame_duration_t frame_duration;
uint16_t octets_per_frame;
} variants[6];
} codec_configurations[] = {
{
8000, 0x01, 2,
{
{ "8_1", BTSTACK_LC3_FRAME_DURATION_7500US, 26},
{ "8_2", BTSTACK_LC3_FRAME_DURATION_10000US, 30}
}
},
{
16000, 0x03, 2,
{
{ "16_1", BTSTACK_LC3_FRAME_DURATION_7500US, 30},
{ "16_2", BTSTACK_LC3_FRAME_DURATION_10000US, 40}
}
},
{
24000, 0x05, 2,
{
{ "24_1", BTSTACK_LC3_FRAME_DURATION_7500US, 45},
{ "24_2", BTSTACK_LC3_FRAME_DURATION_10000US, 60}
}
},
{
32000, 0x06, 2,
{
{ "32_1", BTSTACK_LC3_FRAME_DURATION_7500US, 60},
{ "32_2", BTSTACK_LC3_FRAME_DURATION_10000US, 80}
}
},
{
44100, 0x07, 2,
{
{ "441_1", BTSTACK_LC3_FRAME_DURATION_7500US, 97},
{ "441_2", BTSTACK_LC3_FRAME_DURATION_10000US, 130}
}
},
{
48000, 0x08, 6,
{
{ "48_1", BTSTACK_LC3_FRAME_DURATION_7500US, 75},
{ "48_2", BTSTACK_LC3_FRAME_DURATION_10000US, 100},
{ "48_3", BTSTACK_LC3_FRAME_DURATION_7500US, 90},
{ "48_4", BTSTACK_LC3_FRAME_DURATION_10000US, 120},
{ "48_5", BTSTACK_LC3_FRAME_DURATION_7500US, 117},
{ "48_6", BTSTACK_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_channels,
codec_configurations[menu_sampling_frequency].samplingrate_hz,
codec_configurations[menu_sampling_frequency].variants[menu_variant].frame_duration == BTSTACK_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_channels ; channel++){
btstack_lc3_encoder_google_t * context = &encoder_contexts[channel];
lc3_encoder = btstack_lc3_encoder_google_init_instance(context);
lc3_encoder->configure(context, sampling_frequency_hz, frame_duration, octets_per_frame);
}
number_samples_per_frame = btstack_lc3_samples_per_frame(sampling_frequency_hz, frame_duration);
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 == BTSTACK_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_channels; channel++) {
int16_t value = sine_int16[sine_phases[channel]] / 4;
pcm[sample * num_channels + channel] = 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 *) pcm, number_samples_per_frame, &trkbuf);
if (num_channels == 1) {
// stereo -> mono
uint16_t i;
for (i=0;i<number_samples_per_frame;i++){
pcm[i] = (pcm[2*i] / 2) + (pcm[2*i+1] / 2);
}
}
break;
default:
btstack_unreachable();
break;
}
time_generation_ms = btstack_run_loop_get_time_ms() - start_ms;
iso_frame_counter++;
}
static void encode(uint8_t channel){
// encode as lc3
lc3_encoder->encode_signed_16(&encoder_contexts[channel], &pcm[channel], num_channels, &iso_payload[channel * MAX_LC3_FRAME_BYTES]);
}
static void send_iso_packet(uint8_t cis_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, cis_con_handles[cis_index] | (2 << 12));
// len
little_endian_store_16(buffer, 2, 0 + 4 + num_channels * octets_per_frame);
// TimeStamp if TS flag is set
// packet seq nr
little_endian_store_16(buffer, 4, packet_sequence_numbers[cis_index]);
// iso sdu len
little_endian_store_16(buffer, 6, num_channels * octets_per_frame);
#ifdef COUNT_MODE
// test data: bis_index, counter
buffer[8] = bis_index;
memset(&buffer[9], iso_frame_counter, num_channels * octets_per_frame - 1);
#else
// copy encoded payload
uint8_t i;
uint16_t offset = 8;
for (i=0; i<num_channels;i++) {
memcpy(&buffer[offset], &iso_payload[i * MAX_LC3_FRAME_BYTES], octets_per_frame);
offset += octets_per_frame;
}
#endif
// send
hci_send_iso_packet_buffer(offset);
if (((packet_sequence_numbers[cis_index] & 0x7f) == 0) && (cis_index == 0)) {
printf("Encoding time: %u\n", time_generation_ms);
}
packet_sequence_numbers[cis_index]++;
}
static void generate_audio_and_encode(uint8_t cis_index){
generate_audio();
uint8_t i;
for (i=0; i<num_channels;i++) {
encode(i);
}
}
static void start_unicast() {// 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();
// setup mod player
setup_mod_player();
// setup sine generator
if (sampling_frequency_hz == 44100){
sine_step = 2;
} else {
sine_step = 96000 / sampling_frequency_hz;
}
// update adv / BASE
adv_data[4] = 0; // subtype
adv_data[5] = 0; // flags
adv_data[6] = num_channels;
adv_data[7] = sampling_frequency_hz / 1000;
adv_data[8] = frame_duration == BTSTACK_LC3_FRAME_DURATION_7500US ? 0 : 1;
adv_data[9] = octets_per_frame;
// setup advertisements
uint16_t adv_int_min = 0x0030;
uint16_t adv_int_max = 0x0030;
uint8_t adv_type = 0;
bd_addr_t null_addr;
memset(null_addr, 0, 6);
gap_advertisements_set_params(adv_int_min, adv_int_max, adv_type, 0, null_addr, 0x07, 0x00);
gap_advertisements_set_data(sizeof(adv_data), adv_data);
gap_advertisements_enable(1);
num_cis = 1;
app_state = APP_W4_CIS_COMPLETE;
}
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;
bd_addr_t event_addr;
hci_con_handle_t cis_con_handle;
uint8_t i;
switch (packet[0]) {
case BTSTACK_EVENT_STATE:
switch(btstack_event_state_get_state(packet)) {
case HCI_STATE_WORKING:
app_state = APP_IDLE;
#ifdef ENABLE_DEMO_MODE
// start unicast automatically, mod player, 48_5_2
num_channels = 2;
menu_sampling_frequency = 5;
menu_variant = 4;
start_unicast();
#else
show_usage();
printf("Please select sample frequency and variation, then start advertising\n");
#endif
break;
case HCI_STATE_OFF:
printf("Goodbye\n");
exit(0);
break;
default:
break;
}
break;
case HCI_EVENT_LE_META:
switch(hci_event_le_meta_get_subevent_code(packet)){
case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
next_cis_index = 0;
break;
case HCI_SUBEVENT_LE_CIS_REQUEST:
cis_con_handles[next_cis_index] = hci_subevent_le_cis_request_get_cis_connection_handle(packet);
gap_cis_accept(cis_con_handles[next_cis_index]);
next_cis_index++;
break;
default:
break;
}
break;
case HCI_EVENT_META_GAP:
switch (hci_event_gap_meta_get_subevent_code(packet)) {
case GAP_SUBEVENT_CIS_CREATED: {
cis_con_handle = gap_subevent_cis_created_get_cis_con_handle(packet);
for (i=0; i < num_cis; i++){
if (cis_con_handle == cis_con_handles[i]){
cis_established[i] = true;
}
}
// check for complete
bool complete = true;
for (i=0; i < num_cis; i++) {
complete &= cis_established[i];
}
// ready to send
if (complete) {
printf("All CIS Established and ISO Path setup\n");
next_cis_index = 0;
app_state = APP_STREAMING;
generate_audio_and_encode(0);
hci_request_cis_can_send_now_events(cis_con_handles[0]);
}
break;
}
}
break;
case HCI_EVENT_CIS_CAN_SEND_NOW:
cis_con_handle = hci_event_cis_can_send_now_get_cis_con_handle(packet);
for (i=0;i<num_cis;i++){
if (cis_con_handle == cis_con_handles[i]){
// allow to send
send_iso_packet(i);
generate_audio_and_encode(0);
hci_request_cis_can_send_now_events(cis_con_handles[0]);
}
}
break;
default:
break;
}
}
static void show_usage(void){
printf("\n--- LE Audio Unicast 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 advertising\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_channels = 3 - num_channels;
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");
app_state = APP_W4_POWER_OFF;
hci_power_control(HCI_POWER_OFF);
break;
case 's':
if (app_state != APP_IDLE){
printf("Cannot start advertising - not in idle state\n");
break;
}
start_unicast();
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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