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btstack/example/le_audio_demo_util_source.c

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/*
* Copyright (C) {copyright_year} 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_demo_util_source.c"
#include "le_audio_demo_util_source.h"
#include <stdio.h>
#include <inttypes.h>
#include <math.h>
#include "btstack_config.h"
#include "btstack_bool.h"
#include "btstack_debug.h"
#include "btstack_ring_buffer.h"
#include "hci.h"
#include "btstack_audio.h"
#include "btstack_lc3_google.h"
#include "btstack_lc3plus_fraunhofer.h"
#include "hxcmod.h"
#include "mods/mod.h"
#define MAX_CHANNELS 5
#define MAX_SAMPLES_PER_10MS_FRAME 480
#define MAX_LC3_FRAME_BYTES 155
// live recording
#define RECORDING_PREBUFFER__MS 20
#define RECORDING_BUFFER_MS 40
// SOURCE
static float sine_frequencies[MAX_CHANNELS] = {
261.63, // C-4
311.13, // Es-4
369.99, // G-4
493.88, // B-4
587.33, // D-5
};
// 48000 / 261.6 = 183.46
#define SINE_MAX_SAMPLES_AT_48KHZ 185
#define PI 3.14159265358979323846
static int16_t sine_table[MAX_CHANNELS * SINE_MAX_SAMPLES_AT_48KHZ];
static uint16_t le_audio_demo_source_octets_per_frame;
static uint16_t le_audio_demo_source_packet_sequence_numbers[MAX_CHANNELS];
static uint8_t le_audio_demo_source_iso_frame_counter;
static uint32_t le_audio_demo_source_sampling_frequency_hz;
static btstack_lc3_frame_duration_t le_audio_demo_source_frame_duration;
static uint8_t le_audio_demo_source_num_channels;
static uint8_t le_audio_demo_source_num_streams;
static uint8_t le_audio_demo_source_num_channels_per_stream;
static uint16_t le_audio_demo_source_num_samples_per_frame;
static uint8_t le_audio_demo_source_iso_payload[MAX_CHANNELS * MAX_LC3_FRAME_BYTES];
// lc3 encoder
static const btstack_lc3_encoder_t * le_audio_demo_source_lc3_encoder;
static btstack_lc3_encoder_google_t le_audio_demo_source_encoder_contexts[MAX_CHANNELS];
static int16_t le_audio_demo_source_pcm[MAX_CHANNELS * MAX_SAMPLES_PER_10MS_FRAME];
// sine generator
static uint16_t le_audio_demo_source_sine_samples[MAX_CHANNELS];
static uint16_t le_audio_demo_source_sine_phases[MAX_CHANNELS];
// mod player
static bool le_audio_demo_source_hxcmod_initialized;
static modcontext le_audio_demo_source_hxcmod_context;
static tracker_buffer_state le_audio_demo_source_hxcmod_trkbuf;
// recording / portaudio
#define SAMPLES_PER_CHANNEL_RECORDING (MAX_SAMPLES_PER_10MS_FRAME * RECORDING_BUFFER_MS / 10)
static uint8_t recording_storage[MAX_CHANNELS * 2 * SAMPLES_PER_CHANNEL_RECORDING];
static btstack_ring_buffer_t le_audio_demo_source_recording_buffer;
static uint16_t le_audio_demo_source_recording_stored_samples;
static uint16_t le_audio_demo_source_recording_prebuffer_samples;
static bool le_audio_demo_source_recording_streaming;
static btstack_audio_source_t const * le_audio_demo_audio_source;
// generation method
static le_audio_demo_source_generator le_audio_demo_util_source_generator = AUDIO_SOURCE_SINE;
// recording callback has channels interleaved, collect per channel
static void le_audio_util_source_recording_callback(const int16_t * buffer, uint16_t num_samples){
log_info("store %u samples per channel", num_samples);
uint32_t bytes_to_store = le_audio_demo_source_num_channels * num_samples * 2;
if (bytes_to_store < btstack_ring_buffer_bytes_free(&le_audio_demo_source_recording_buffer)){
btstack_ring_buffer_write(&le_audio_demo_source_recording_buffer, (uint8_t *)buffer, bytes_to_store);
le_audio_demo_source_recording_stored_samples += num_samples;
}
}
void le_audio_demo_util_source_init(void) {
le_audio_demo_audio_source = btstack_audio_source_get_instance();
}
static bool le_audio_demo_util_source_recording_start(void){
bool ok = false;
if (le_audio_demo_audio_source != NULL){
int init_ok = le_audio_demo_audio_source->init(le_audio_demo_source_num_channels, le_audio_demo_source_sampling_frequency_hz,
&le_audio_util_source_recording_callback);
log_info("recording initialized, ok %u", init_ok);
if (init_ok){
btstack_ring_buffer_init(&le_audio_demo_source_recording_buffer, recording_storage, sizeof(recording_storage));
le_audio_demo_source_recording_prebuffer_samples = le_audio_demo_source_num_channels * le_audio_demo_source_sampling_frequency_hz * RECORDING_PREBUFFER__MS / 1000;
le_audio_demo_source_recording_streaming = false;
le_audio_demo_source_recording_stored_samples = 0;
le_audio_demo_audio_source->start_stream();
log_info("recording start, %u prebuffer samples per channel", le_audio_demo_source_recording_prebuffer_samples / le_audio_demo_source_num_channels);
ok = true;
}
}
return ok;
}
static void le_audio_demo_util_source_recording_stop(void) {
le_audio_demo_audio_source->stop_stream();
}
static void le_audio_demo_source_setup_lc3_encoder(void){
uint8_t channel;
for (channel = 0 ; channel < le_audio_demo_source_num_channels ; channel++){
btstack_lc3_encoder_google_t * context = &le_audio_demo_source_encoder_contexts[channel];
le_audio_demo_source_lc3_encoder = btstack_lc3_encoder_google_init_instance(context);
le_audio_demo_source_lc3_encoder->configure(context, le_audio_demo_source_sampling_frequency_hz, le_audio_demo_source_frame_duration, le_audio_demo_source_octets_per_frame);
}
printf("LC3 Encoder config: %" PRIu32 " hz, frame duration %s ms, num samples %u, num octets %u\n",
le_audio_demo_source_sampling_frequency_hz, le_audio_demo_source_frame_duration == BTSTACK_LC3_FRAME_DURATION_7500US ? "7.5" : "10",
le_audio_demo_source_num_samples_per_frame, le_audio_demo_source_octets_per_frame);
}
static void le_audio_demo_source_setup_mod_player(void){
if (!le_audio_demo_source_hxcmod_initialized) {
le_audio_demo_source_hxcmod_initialized = hxcmod_init(&le_audio_demo_source_hxcmod_context);
btstack_assert(le_audio_demo_source_hxcmod_initialized != 0);
}
hxcmod_unload(&le_audio_demo_source_hxcmod_context);
hxcmod_setcfg(&le_audio_demo_source_hxcmod_context, le_audio_demo_source_sampling_frequency_hz, 1, 1);
hxcmod_load(&le_audio_demo_source_hxcmod_context, (void *) &mod_data, mod_len);
}
static void le_audio_demo_source_setup_sine_generator(void){
// pre-compute sine for all channels
uint8_t channel;
for (channel = 0; channel < MAX_CHANNELS ; channel++){
float frequency_hz = (float) sine_frequencies[channel];
float samplerate_hz = (float) le_audio_demo_source_sampling_frequency_hz;
float period_samples =samplerate_hz / frequency_hz;
le_audio_demo_source_sine_samples[channel] = (uint16_t) period_samples;
le_audio_demo_source_sine_phases[channel] = 0;
uint16_t i;
for (i=0;i<le_audio_demo_source_sine_samples[channel] ;i++){
float sine_value = sin(2 * PI * i / period_samples);
sine_table[channel*SINE_MAX_SAMPLES_AT_48KHZ + i] = (int16_t)(sine_value * 32767);
}
}
}
void le_audio_demo_util_source_configure(uint8_t num_streams, uint8_t num_channels_per_stream, uint32_t sampling_frequency_hz,
btstack_lc3_frame_duration_t frame_duration, uint16_t octets_per_frame) {
le_audio_demo_source_sampling_frequency_hz = sampling_frequency_hz;
le_audio_demo_source_frame_duration = frame_duration;
le_audio_demo_source_octets_per_frame = octets_per_frame;
le_audio_demo_source_num_streams = num_streams;
le_audio_demo_source_num_channels_per_stream = num_channels_per_stream;
le_audio_demo_source_num_channels = num_streams * num_channels_per_stream;
btstack_assert((le_audio_demo_source_num_channels > 0) || (le_audio_demo_source_num_channels <= MAX_CHANNELS));
le_audio_demo_source_num_samples_per_frame = btstack_lc3_samples_per_frame(sampling_frequency_hz, frame_duration);
btstack_assert(le_audio_demo_source_num_samples_per_frame <= MAX_SAMPLES_PER_10MS_FRAME);
// setup encoder
le_audio_demo_source_setup_lc3_encoder();
// setup sine generator
le_audio_demo_source_setup_sine_generator();
// setup mod player
le_audio_demo_source_setup_mod_player();
}
void le_audio_demo_util_source_generate_iso_frame(le_audio_demo_source_generator generator) {
btstack_assert(le_audio_demo_source_octets_per_frame != 0);
uint16_t sample;
bool encode_pcm = true;
// lazy init of btstack_audio, fallback to sine
if ((generator == AUDIO_SOURCE_RECORDING) && (le_audio_demo_util_source_generator != AUDIO_SOURCE_RECORDING)){
bool ok = le_audio_demo_util_source_recording_start();
if (ok) {
le_audio_demo_util_source_generator = generator;
} else {
generator = AUDIO_SOURCE_SINE;
}
}
// stop recording
if ((generator != AUDIO_SOURCE_RECORDING) && (le_audio_demo_util_source_generator == AUDIO_SOURCE_RECORDING)) {
le_audio_demo_util_source_recording_stop();
}
switch (generator){
case AUDIO_SOURCE_COUNTER:
encode_pcm = false;
memset(le_audio_demo_source_iso_payload, le_audio_demo_source_iso_frame_counter++, sizeof(le_audio_demo_source_iso_payload));
break;
case AUDIO_SOURCE_SINE:
// use pre-computed sine for all channels
for (sample = 0 ; sample < le_audio_demo_source_num_samples_per_frame ; sample++){
uint8_t i;
for (i = 0; i < le_audio_demo_source_num_channels; i++) {
int16_t value = sine_table[i*SINE_MAX_SAMPLES_AT_48KHZ + le_audio_demo_source_sine_phases[i]];
le_audio_demo_source_pcm[sample * le_audio_demo_source_num_channels + i] = value;
le_audio_demo_source_sine_phases[i] += 1;
if (le_audio_demo_source_sine_phases[i] >= le_audio_demo_source_sine_samples[i]) {
le_audio_demo_source_sine_phases[i] = 0;
}
}
}
break;
case AUDIO_SOURCE_MODPLAYER:
// mod player configured for stereo
hxcmod_fillbuffer(&le_audio_demo_source_hxcmod_context, le_audio_demo_source_pcm, le_audio_demo_source_num_samples_per_frame, &le_audio_demo_source_hxcmod_trkbuf);
// stereo -> mono
if (le_audio_demo_source_num_channels == 1) {
uint16_t i;
for (i=0;i<le_audio_demo_source_num_samples_per_frame;i++){
le_audio_demo_source_pcm[i] = (le_audio_demo_source_pcm[2*i] / 2) + (le_audio_demo_source_pcm[2*i+1] / 2);
}
}
// duplicate stereo channels
if (le_audio_demo_source_num_channels > 2) {
int16_t i;
for (i = le_audio_demo_source_num_samples_per_frame - 1; i >= 0; i--) {
uint16_t channel_dst;
for (channel_dst=0; channel_dst < le_audio_demo_source_num_channels; channel_dst++){
uint16_t channel_src = channel_dst & 1;
le_audio_demo_source_pcm[i * le_audio_demo_source_num_channels + channel_dst] =
le_audio_demo_source_pcm[i * 2 + channel_src];
}
}
}
break;
case AUDIO_SOURCE_RECORDING:
if (le_audio_demo_source_recording_streaming == false){
if (le_audio_demo_source_recording_stored_samples >= le_audio_demo_source_recording_prebuffer_samples){
// start streaming audio
le_audio_demo_source_recording_streaming = true;
log_info("Streaming started");
}
}
if (le_audio_demo_source_recording_streaming){
uint32_t bytes_needed = le_audio_demo_source_num_channels * le_audio_demo_source_num_samples_per_frame * 2;
if (btstack_ring_buffer_bytes_available(&le_audio_demo_source_recording_buffer) >= bytes_needed){
uint32_t bytes_read;
btstack_ring_buffer_read(&le_audio_demo_source_recording_buffer, (uint8_t*) le_audio_demo_source_pcm, bytes_needed, &bytes_read);
btstack_assert(bytes_needed == bytes_needed);
log_info("Read %u samples per channel", le_audio_demo_source_num_samples_per_frame);
le_audio_demo_source_recording_stored_samples -= le_audio_demo_source_num_samples_per_frame;
} else {
le_audio_demo_source_recording_streaming = false;
log_info("Streaming underrun");
}
} else {
memset(le_audio_demo_source_pcm, 0, sizeof(le_audio_demo_source_pcm));
}
break;
default:
btstack_unreachable();
break;
}
if (encode_pcm){
uint8_t i;
for (i=0;i<le_audio_demo_source_num_channels;i++){
le_audio_demo_source_lc3_encoder->encode_signed_16(&le_audio_demo_source_encoder_contexts[i], &le_audio_demo_source_pcm[i], le_audio_demo_source_num_channels, &le_audio_demo_source_iso_payload[i * MAX_LC3_FRAME_BYTES]);
}
}
le_audio_demo_util_source_generator = generator;
}
void le_audio_demo_util_source_send(uint8_t stream_index, hci_con_handle_t con_handle){
btstack_assert(le_audio_demo_source_octets_per_frame != 0);
hci_reserve_packet_buffer();
uint8_t * buffer = hci_get_outgoing_packet_buffer();
// complete SDU, no TimeStamp
little_endian_store_16(buffer, 0, ((uint16_t) con_handle) | (2 << 12));
// len
little_endian_store_16(buffer, 2, 0 + 4 + le_audio_demo_source_num_channels_per_stream * le_audio_demo_source_octets_per_frame);
// TimeStamp if TS flag is set
// packet seq nr
little_endian_store_16(buffer, 4, le_audio_demo_source_packet_sequence_numbers[stream_index]);
// iso sdu len
little_endian_store_16(buffer, 6, le_audio_demo_source_num_channels_per_stream * le_audio_demo_source_octets_per_frame);
uint16_t offset = 8;
// copy encoded payload
uint8_t i;
for (i=0; i<le_audio_demo_source_num_channels_per_stream;i++) {
uint8_t effective_channel = (stream_index * le_audio_demo_source_num_channels_per_stream) + i;
memcpy(&buffer[offset], &le_audio_demo_source_iso_payload[effective_channel * MAX_LC3_FRAME_BYTES], le_audio_demo_source_octets_per_frame);
offset += le_audio_demo_source_octets_per_frame;
}
// send
hci_send_iso_packet_buffer(offset);
le_audio_demo_source_packet_sequence_numbers[stream_index]++;
}
void le_audio_demo_util_source_close(void){
if (le_audio_demo_audio_source != NULL){
le_audio_demo_audio_source->close();
}
}
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