void sco_demo_send(hci_con_handle_t sco_handle){
if (!sco_handle) return;
const int sco_packet_length = 24 + 3; // hci_get_sco_packet_length();
const int sco_payload_length = sco_packet_length - 3;
hci_reserve_packet_buffer();
uint8_t * sco_packet = hci_get_outgoing_packet_buffer();
// set handle + flags
little_endian_store_16(sco_packet, 0, sco_handle);
// set len
sco_packet[2] = sco_payload_length;
const int frames_per_packet = sco_payload_length; // for 8-bit data. for 16-bit data it's /2
#if SCO_DEMO_MODE == SCO_DEMO_MODE_SINE
int i;
for (i=0;i<frames_per_packet;i++){
sco_packet[3+i] = sine[phase];
phase++;
if (phase >= sizeof(sine)) phase = 0;
}
#else
#if SCO_DEMO_MODE == SCO_DEMO_MODE_ASCII
memset(&sco_packet[3], phase++, frames_per_packet);
if (phase > 'z') phase = 'a';
#else
int j;
for (j=0;j<frames_per_packet;j++){
sco_packet[3+j] = phase++;
}
#endif
#endif
hci_send_sco_packet_buffer(sco_packet_length);
// request another send event
hci_request_sco_can_send_now_event();
count_sent++;
if ((count_sent % SCO_REPORT_PERIOD) == 0) sco_report();
}
void sco_demo_send(hci_con_handle_t sco_handle){
if (!sco_handle) return;
int sco_packet_length = hci_get_sco_packet_length();
int sco_payload_length = sco_packet_length - 3;
hci_reserve_packet_buffer();
uint8_t * sco_packet = hci_get_outgoing_packet_buffer();
#if SCO_DEMO_MODE == SCO_DEMO_MODE_SINE
#ifdef ENABLE_HFP_WIDE_BAND_SPEECH
if (negotiated_codec == HFP_CODEC_MSBC){
// overwrite
sco_payload_length = 24;
sco_packet_length = sco_payload_length + 3;
if (hfp_msbc_num_bytes_in_stream() < sco_payload_length){
log_error("mSBC stream is empty.");
}
hfp_msbc_read_from_stream(sco_packet + 3, sco_payload_length);
if (msbc_file_out){
// log outgoing mSBC data for testing
fwrite(sco_packet + 3, sco_payload_length, 1, msbc_file_out);
}
sco_demo_msbc_fill_sine_audio_frame();
} else
#endif
{
const int audio_samples_per_packet = sco_payload_length / CVSD_BYTES_PER_FRAME;
sco_demo_sine_wave_int16_at_8000_hz_little_endian(audio_samples_per_packet, &sco_packet[3]);
}
#endif
#if SCO_DEMO_MODE == SCO_DEMO_MODE_MICROPHONE
#ifdef HAVE_PORTAUDIO
if (negotiated_codec == HFP_CODEC_MSBC){
// MSBC
// overwrite
sco_payload_length = 24;
sco_packet_length = sco_payload_length + 3;
if (pa_input_paused){
if (btstack_ring_buffer_bytes_available(&pa_input_ring_buffer) >= MSBC_PA_PREBUFFER_BYTES){
// resume sending
pa_input_paused = 0;
}
}
if (!pa_input_paused){
int num_samples = hfp_msbc_num_audio_samples_per_frame();
if (hfp_msbc_can_encode_audio_frame_now() && btstack_ring_buffer_bytes_available(&pa_input_ring_buffer) >= (num_samples * MSBC_BYTES_PER_FRAME)){
int16_t sample_buffer[num_samples];
uint32_t bytes_read;
btstack_ring_buffer_read(&pa_input_ring_buffer, (uint8_t*) sample_buffer, num_samples * MSBC_BYTES_PER_FRAME, &bytes_read);
hfp_msbc_encode_audio_frame(sample_buffer);
num_audio_frames++;
}
}
if (hfp_msbc_num_bytes_in_stream() < sco_payload_length){
log_error("mSBC stream should not be empty.");
memset(sco_packet + 3, 0, sco_payload_length);
pa_input_paused = 1;
} else {
hfp_msbc_read_from_stream(sco_packet + 3, sco_payload_length);
if (msbc_file_out){
// log outgoing mSBC data for testing
fwrite(sco_packet + 3, sco_payload_length, 1, msbc_file_out);
}
}
} else {
// CVSD
log_info("send: bytes avail %u, free %u, counter %u", btstack_ring_buffer_bytes_available(&pa_input_ring_buffer), btstack_ring_buffer_bytes_free(&pa_input_ring_buffer), pa_input_counter);
// fill with silence while paused
int bytes_to_copy = sco_payload_length;
if (pa_input_paused){
if (btstack_ring_buffer_bytes_available(&pa_input_ring_buffer) >= CVSD_PA_PREBUFFER_BYTES){
// resume sending
pa_input_paused = 0;
}
}
// get data from ringbuffer
uint16_t pos = 0;
uint8_t * sample_data = &sco_packet[3];
if (!pa_input_paused){
uint32_t bytes_read = 0;
btstack_ring_buffer_read(&pa_input_ring_buffer, sample_data, bytes_to_copy, &bytes_read);
// flip 16 on big endian systems
// @note We don't use (uint16_t *) casts since all sample addresses are odd which causes crahses on some systems
if (btstack_is_big_endian()){
int i;
for (i=0;i<bytes_read;i+=2){
uint8_t tmp = sample_data[i*2];
sample_data[i*2] = sample_data[i*2+1];
sample_data[i*2+1] = tmp;
}
}
bytes_to_copy -= bytes_read;
pos += bytes_read;
}
// fill with 0 if not enough
if (bytes_to_copy){
memset(sample_data + pos, 0, bytes_to_copy);
pa_input_paused = 1;
}
}
#else
// just send '0's
if (negotiated_codec == HFP_CODEC_MSBC){
sco_payload_length = 24;
sco_packet_length = sco_payload_length + 3;
}
memset(sco_packet + 3, 0, sco_payload_length);
#endif
#endif
#if SCO_DEMO_MODE == SCO_DEMO_MODE_ASCII
memset(&sco_packet[3], phase++, sco_payload_length);
if (phase > 'z') phase = 'a';
#endif
#if SCO_DEMO_MODE == SCO_DEMO_MODE_COUNTER
int j;
for (j=0;j<sco_payload_length;j++){
sco_packet[3+j] = phase++;
}
#endif
#if SCO_DEMO_MODE == SCO_DEMO_MODE_55
int j;
for (j=0;j<sco_payload_length;j++){
// sco_packet[3+j] = j & 1 ? 0x35 : 0x53;
sco_packet[3+j] = 0x55;
}
#endif
#if SCO_DEMO_MODE == SCO_DEMO_MODE_00
int j;
for (j=0;j<sco_payload_length;j++){
sco_packet[3+j] = 0x00;
}
// additional hack
// big_endian_store_16(sco_packet, 5, phase++);
(void) phase;
#endif
// test silence
// memset(sco_packet+3, 0, sco_payload_length);
// set handle + flags
little_endian_store_16(sco_packet, 0, sco_handle);
// set len
sco_packet[2] = sco_payload_length;
// finally send packet
hci_send_sco_packet_buffer(sco_packet_length);
// request another send event
hci_request_sco_can_send_now_event();
count_sent++;
#if SCO_DEMO_MODE != SCO_DEMO_MODE_55
if ((count_sent % SCO_REPORT_PERIOD) == 0) sco_report();
#endif
}