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osmocom-analog/src/fuenf/dsp.c

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/* selective call signal processing
*
* (C) 2019 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define CHAN fuenf->sender.kanal
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include <libsample/sample.h>
#include <libdebug/debug.h>
#include <libmobile/call.h>
#include "fuenf.h"
#include "dsp.h"
#define MAX_DISPLAY 1.4 /* something above speech level, no emphasis */
#define MAX_MODULATION 3000.0 /* maximum bandwidth of audio signal */
/* TX and RX parameters */
#define TONE_LEVEL 0.5 /* because we have two tones, also applies to digits */
/* TX parameters */
#define TX_LEN_PREAMBLE 0.600 /* duration of preamble */
#define TX_LEN_PAUSE 0.600 /* duration of pause */
#define TX_LEN_POSTAMBLE 0.070 /* duration of postamble */
#define TX_LEN_DIGIT 0.070 /* duration of paging tone */
#define TX_NUM_KANAL 10 /* number of 'Kanalbelegungston' */
#define TX_LEN_KANAL 0.250 /* duration of 'Kanalbelegungston' */
#define TX_LEN_KANAL_PAUSE 0.250 /* pause after 'Kanalbelegungston' */
#define TX_LEN_SIGNAL 5.0 /* double tone signal length */
/* RX parameters */
#define RX_MIN_LEVEL 0.1 /* level relative to TONE_LEVEL, below is silence (-20 dB) */
#define RX_MIN_PREAMBLE 800 /* duration of silence before detecting first digit (in samples) */
#define RX_DIGIT_FILTER 100.0 /* frequency to allow change of tones ( 100 Hz = 5 ms ) */
#define RX_TOL_DIGIT_FREQ 0.045 /* maximum frequency error factor allowd to detect a tone (+- 4.5%) */
#define RX_LEN_DIGIT_TH 80 /* time to wait for digit being stable ( 10 ms ) */
#define RX_LEN_DIGIT_MIN 400 /* minimum length in seconds allowed for a digit (- 20 ms in samples) */
#define RX_LEN_DIGIT_MAX 720 /* minimum length in seconds allowed for a digit (+ 20 ms in samples) */
#define RX_LEN_TONE_MIN 16000 /* minimum length in seconds to detect double tone (2 seconds in samples) */
#define RX_WAIT_TONE_MAX 48000 /* maximum time to wait for double tone (6 seconds in samples) */
#define RX_TOL_TONE_FREQ 5.0 /* use +-5 Hz for bandwidth, to make things simpler. (-7.4 dB @ +-5 Hz) */
static double digit_freq[DSP_NUM_DIGITS] = {
1060.0,
1160.0,
1270.0,
1400.0,
1530.0,
1670.0,
1830.0,
2000.0,
2200.0,
2400.0,
2600.0, /* repeat digit */
};
#define DIGIT_FREQ_MIN 1080.0
#define DIGIT_FREQ_MAX 2600.0
#define REPEAT_DIGIT 10
/* these are the frequencies of tones to be detected */
static double tone_freq[DSP_NUM_TONES] = {
675.0,
825.0,
1240.0,
1860.0,
};
#define DSP_NUM_SIGNALS 6
static struct signals {
enum fuenf_funktion funktion;
int tone1, tone2;
} signals[DSP_NUM_SIGNALS] = {
{ FUENF_FUNKTION_FEUER, 0, 2 },
{ FUENF_FUNKTION_PROBE, 0, 3 },
{ FUENF_FUNKTION_WARNUNG, 0, 1 },
{ FUENF_FUNKTION_ABC, 2, 3 },
{ FUENF_FUNKTION_ENTWARNUNG, 1, 3 },
{ FUENF_FUNKTION_KATASTROPHE, 1, 2 },
};
/* Init transceiver instance. */
int dsp_init_sender(fuenf_t *fuenf, int samplerate, double max_deviation, double signal_deviation)
{
int i;
int rc;
sample_t *spl;
int len;
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Init DSP for transceiver.\n");
/* set modulation parameters */
sender_set_fm(&fuenf->sender, max_deviation, MAX_MODULATION, signal_deviation, MAX_DISPLAY);
fuenf->sample_duration = 1.0 / (double)samplerate;
/* init digit demodulator */
rc = fm_demod_init(&fuenf->rx_digit_demod, 8000, (DIGIT_FREQ_MIN + DIGIT_FREQ_MAX) / 2.0, DIGIT_FREQ_MAX - DIGIT_FREQ_MIN);
if (rc)
goto error;
/* use fourth order (2 iter) filter, since it is as fast as second order (1 iter) filter */
iir_lowpass_init(&fuenf->rx_digit_lp, RX_DIGIT_FILTER, 8000, 2);
/* init signal tone filters */
for (i = 0; i < DSP_NUM_TONES; i++)
audio_goertzel_init(&fuenf->rx_tone_goertzel[i], tone_freq[i], 8000);
/* allocate buffer */
len = (int)(8000.0 * (1.0 / RX_TOL_TONE_FREQ) + 0.5);
spl = calloc(1, len * sizeof(*spl));
if (!spl) {
PDEBUG(DDSP, DEBUG_ERROR, "No memory!\n");
goto error;
}
fuenf->rx_tone_filter_spl = spl;
fuenf->rx_tone_filter_size = len;
/* display values */
fuenf->dmp_digit_level = display_measurements_add(&fuenf->sender.dispmeas, "Digit Level", "%.0f %%", DISPLAY_MEAS_LAST, DISPLAY_MEAS_LEFT, 0.0, 150.0, 100.0);
for (i = 0; i < DSP_NUM_TONES; i++) {
char name[64];
sprintf(name, "%.0f Hz Level", tone_freq[i]);
fuenf->dmp_tone_levels[i] = display_measurements_add(&fuenf->sender.dispmeas, name, "%.0f %%", DISPLAY_MEAS_LAST, DISPLAY_MEAS_LEFT, 0.0, 150.0, 100.0);
}
return 0;
error:
dsp_cleanup_sender(fuenf);
return -rc;
}
/* Cleanup transceiver instance. */
void dsp_cleanup_sender(fuenf_t *fuenf)
{
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Cleanup DSP for transceiver.\n");
/* free tone buffers */
if (fuenf->rx_tone_filter_spl)
free(fuenf->rx_tone_filter_spl);
}
//#define DEBUG
/* receive digits and decode */
static void digit_decode(fuenf_t *fuenf, sample_t *samples, int length)
{
sample_t frequency[length], f, a;
sample_t I[length], Q[length];
int i, d;
int change, change_count;
/* tone demodulation */
fm_demodulate_real(&fuenf->rx_digit_demod, frequency, length, samples, I, Q);
/* reduce bandwidth of tone detector */
iir_process(&fuenf->rx_digit_lp, frequency, length);
/* detect tone */
for (i = 0; i < length; i++) {
/* get frequency */
f = frequency[i] + (DIGIT_FREQ_MIN + DIGIT_FREQ_MAX) / 2.0;
/* get amplitude (a is a sqaure of the amplitude for faster math) */
a = (I[i] * I[i] + Q[i] * Q[i]) * 2.0 * 2.0 / TONE_LEVEL / TONE_LEVEL;
#ifdef DEBUG
if (i == 0) printf("%s %.5f ", debug_amplitude(frequency[i] / (DIGIT_FREQ_MAX - DIGIT_FREQ_MIN) * 2.0), f);
if (i == 0) printf("%s %.5f ", debug_amplitude(sqrt(a)), sqrt(a));
#endif
/* get digit that matches the frequency tolerance */
for (d = 0; d < DSP_NUM_DIGITS; d++) {
if (f >= digit_freq[d] * (1.0 - RX_TOL_DIGIT_FREQ) && f <= digit_freq[d] * (1.0 + RX_TOL_DIGIT_FREQ))
break;
}
/* digit lound enough ? */
if (a >= RX_MIN_LEVEL * RX_MIN_LEVEL && d < DSP_NUM_DIGITS) {
#ifdef DEBUG
if (i == 0 && d < DSP_NUM_DIGITS) printf("digit=%d (%d == no digit detected)", d, DSP_NUM_DIGITS);
#endif
} else
d = -1;
#ifdef DEBUG
if (i == 0) printf("\n");
#endif
/* correct amplitude at cutoff frequency digit '1' and 'repeat'.*/
if (d == 0 || d == DSP_NUM_DIGITS - 1)
a = a * 2; /* actually 1.414 at cutoff, but a is a square, so we can use 2 */
/* count how long this digit sustains, also report if it has changed and when */
if (d != fuenf->rx_digit_last) {
change = 1;
change_count = fuenf->rx_digit_count;
fuenf->rx_digit_last = d;
fuenf->rx_digit_count = 0;
} else
change = 0;
fuenf->rx_digit_count++;
/* state machine to detect sequence of 5 tones */
switch (fuenf->rx_state) {
case RX_STATE_RESET:
/* wait for silence */
if (d >= 0)
break;
/* check if we have enought silence */
if (fuenf->rx_digit_count == RX_MIN_PREAMBLE) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Detected silence, waiting for digits.\n");
fuenf->rx_state = RX_STATE_IDLE;
break;
}
break;
case RX_STATE_IDLE:
/* wait for digit */
if (d < 0)
break;
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "We have some tone, start receiving digits.\n");
fuenf->rx_callsign_count = 0;
fuenf->rx_callsign[fuenf->rx_callsign_count] = d;
fuenf->rx_state = RX_STATE_DIGIT;
break;
case RX_STATE_DIGIT:
/* wait for change */
if (!change) {
if (fuenf->rx_digit_count == RX_LEN_DIGIT_TH) {
if (d < 0) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Not enough digits received, waiting for next transmission.\n");
fuenf->rx_function = 0;
fuenf->rx_function_count = 0;
fuenf->rx_state = RX_STATE_RESET;
break;
}
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Detected digit #%d (amplitude = %.0f%%)\n", d + 1, sqrt(a) * 100.0);
display_measurements_update(fuenf->dmp_digit_level, sqrt(a) * 100.0, 0.0);
break;
}
if (fuenf->rx_digit_count == RX_LEN_DIGIT_MAX) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Detected digit too long, waiting for next transmission.\n");
fuenf->rx_state = RX_STATE_RESET;
break;
}
break;
}
/* if digit did not become stable (changed) during threshold */
if (change_count < RX_LEN_DIGIT_TH) {
/* store detected digit and wait for this one to become stable */
fuenf->rx_callsign[fuenf->rx_callsign_count] = d;
break;
}
/* if counter (when changed) was too low */
if (change_count < RX_LEN_DIGIT_MIN) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Detected digit too short, waiting for next transmission.\n");
fuenf->rx_state = RX_STATE_RESET;
break;
}
/* increment digit and store detected digit */
fuenf->rx_callsign_count++;
fuenf->rx_callsign[fuenf->rx_callsign_count] = d;
/* if 5 tones are received, decode */
if (fuenf->rx_callsign_count == 5) {
for (i = 0; i < 5; i++) {
if (fuenf->rx_callsign[i] == REPEAT_DIGIT) {
if (i == 0) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "First digit is a repeat digit, this is not allowed, waiting for next transmission.\n");
fuenf->rx_state = RX_STATE_RESET;
break;
}
fuenf->rx_callsign[i] = fuenf->rx_callsign[i - 1];
} else
if (fuenf->rx_callsign[i] == 9)
fuenf->rx_callsign[i] = '0';
else
fuenf->rx_callsign[i] = '1' + fuenf->rx_callsign[i];
}
fuenf->rx_callsign[i] = '\0';
if (i < 5)
break;
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Complete call sign '%s' received, waiting for signal tone(s).\n", fuenf->rx_callsign);
fuenf_rx_callsign(fuenf, fuenf->rx_callsign);
fuenf->rx_function_count = 0; /* must reset, so we can detect timeout */
fuenf->rx_state = RX_STATE_WAIT_SIGNAL;
break;
}
break;
default:
/* tones are not decoded here */
break;
}
}
}
/* receive tones and decode */
static void tone_decode(fuenf_t *fuenf, sample_t *samples, int length)
{
double levels[DSP_NUM_TONES];
int tone1 = -1, tone2 = -1;
enum fuenf_funktion funktion = 0;
int i;
/* filter tones */
audio_goertzel(fuenf->rx_tone_goertzel, samples, length, 0, levels, DSP_NUM_TONES);
for (i = 0; i < DSP_NUM_TONES; i++)
fuenf->rx_tone_levels[i] = levels[i] / TONE_LEVEL;
/* find two frequencies */
for (i = 0; i < DSP_NUM_TONES; i++) {
if (fuenf->rx_tone_levels[i] < RX_MIN_LEVEL)
continue;
/* accpet only two ones */
if (tone1 < 0)
tone1 = i;
else if (tone2 < 0)
tone2 = i;
else {
/* abort, if more than two tones */
tone1 = -1;
tone2 = -1;
break;
}
}
/* if exactly two tones */
if (tone2 >= 0) {
/* select function from signal */
for (i = 0; i < DSP_NUM_SIGNALS; i++) {
if (tone1 == signals[i].tone1
&& tone2 == signals[i].tone2) {
funktion = signals[i].funktion;
break;
}
}
}
fuenf->rx_function_count += length;
/* state machine to detect two tones */
switch (fuenf->rx_state) {
case RX_STATE_WAIT_SIGNAL:
/* wait for signal */
if (!funktion) {
if (fuenf->rx_function_count >= RX_WAIT_TONE_MAX) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "There is no double tone, waiting for next transmission.\n");
fuenf->rx_state = RX_STATE_RESET;
break;
}
break;
}
/* store signal */
fuenf->rx_function = funktion;
fuenf->rx_function_count = 0;
fuenf->rx_state = RX_STATE_SIGNAL;
break;
case RX_STATE_SIGNAL:
/* if signal ceases too early */
if (funktion != fuenf->rx_function) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Signal tones ceased to early, waiting for next transmission.\n");
fuenf->rx_state = RX_STATE_RESET;
break;
}
if (fuenf->rx_function_count >= RX_LEN_TONE_MIN) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Detected tones %.0f+%.0f Hz (amplitude = %.0f%%+%.0f%%)\n", tone_freq[tone1], tone_freq[tone2], fuenf->rx_tone_levels[tone1] * 100.0, fuenf->rx_tone_levels[tone2] * 100.0);
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Signal tones detected, done, waiting for next transmission.\n");
fuenf_rx_function(fuenf, fuenf->rx_function);
fuenf->rx_state = RX_STATE_RESET;
break;
}
break;
default:
/* digits are not decoded here */
break;
}
}
/* Process received audio stream from radio unit. */
void sender_receive(sender_t *sender, sample_t *samples, int length, double __attribute__((unused)) rf_level_db)
{
fuenf_t *fuenf = (fuenf_t *) sender;
if (fuenf->rx) {
sample_t down[length];
int count, i;
/* downsample */
memcpy(down, samples, sizeof(down)); // copy, so audio will not be corrupted at loopback
count = samplerate_downsample(&fuenf->sender.srstate, down, length);
/* decode digit */
digit_decode(fuenf, down, count);
/* decode tone */
for (i = 0; i < count; i++) {
/* fill buffer and decode when full */
fuenf->rx_tone_filter_spl[fuenf->rx_tone_filter_pos] = down[i];
if (++fuenf->rx_tone_filter_pos == fuenf->rx_tone_filter_size) {
tone_decode(fuenf, fuenf->rx_tone_filter_spl, fuenf->rx_tone_filter_size);
fuenf->rx_tone_filter_pos = 0;
}
}
/* display levels */
for (i = 0; i < DSP_NUM_TONES; i++)
display_measurements_update(fuenf->dmp_tone_levels[i], fuenf->rx_tone_levels[i] * 100.0, 0.0);
}
}
/* set sequence to send */
int dsp_setup(fuenf_t *fuenf, const char *rufzeichen, enum fuenf_funktion funktion)
{
tone_seq_t *seq = fuenf->tx_seq;
int index = 0, tone_index;
int i;
fuenf->tx_seq_length = 0;
if (strlen(rufzeichen) != 5) {
PDEBUG_CHAN(DDSP, DEBUG_ERROR, "Given call sign has invalid length.\n");
return -EINVAL;
}
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Generating sequence for call sign '%s' and function code '%d'.\n", rufzeichen, funktion);
/* add preamble */
seq[index].phasestep1 = 0;
seq[index].phasestep2 = 0;
seq[index].duration = TX_LEN_PREAMBLE;
index++;
/* add tones */
tone_index = index;
for (i = 0; rufzeichen[i]; i++) {
if (rufzeichen[i] < '0' || rufzeichen[i] > '9') {
PDEBUG_CHAN(DDSP, DEBUG_ERROR, "Given call sign has invalid digit '%c'.\n", rufzeichen[i]);
return -EINVAL;
}
if (rufzeichen[i] == '0')
seq[index].phasestep1 = 2.0 * M_PI * digit_freq[9] * fuenf->sample_duration;
else
seq[index].phasestep1 = 2.0 * M_PI * digit_freq[rufzeichen[i] - '1'] * fuenf->sample_duration;
/* use repeat digit, if two subsequent digits are the same */
if (i > 0 && seq[index - 1].phasestep1 == seq[index].phasestep1) {
seq[index].phasestep1 = 2.0 * M_PI * digit_freq[REPEAT_DIGIT] * fuenf->sample_duration;
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, " -> Adding digit '%c' as tone with %.0f Hz.\n", rufzeichen[i], digit_freq[REPEAT_DIGIT]);
} else
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, " -> Adding digit '%c' as tone with %.0f Hz.\n", rufzeichen[i], digit_freq[rufzeichen[i] - '0']);
seq[index].phasestep2 = 0;
seq[index].duration = TX_LEN_DIGIT;
index++;
}
if (funktion != FUENF_FUNKTION_TURBO) {
/* add pause */
seq[index].phasestep1 = 0;
seq[index].phasestep2 = 0;
seq[index].duration = TX_LEN_PAUSE;
index++;
/* add tones (again) */
for (i = 0; rufzeichen[i]; i++) {
seq[index].phasestep1 = seq[tone_index + i].phasestep1;
seq[index].phasestep2 = 0;
seq[index].duration = TX_LEN_DIGIT;
index++;
}
/* add (second) pause */
seq[index].phasestep1 = 0;
seq[index].phasestep2 = 0;
seq[index].duration = TX_LEN_PAUSE;
index++;
}
#ifndef DEBUG
if (funktion == FUENF_FUNKTION_RUF) {
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, " -> Adding call signal of %.0f Hz.\n", digit_freq[REPEAT_DIGIT]);
for (i = 0; i < TX_NUM_KANAL; i++) {
/* add tone (double volume) */
seq[index].phasestep1 = 2.0 * M_PI * digit_freq[REPEAT_DIGIT] * fuenf->sample_duration;
seq[index].phasestep2 = 2.0 * M_PI * digit_freq[REPEAT_DIGIT] * fuenf->sample_duration;
seq[index].duration = TX_LEN_KANAL;
index++;
/* add pause after tone */
if (i < TX_NUM_KANAL - 1) {
seq[index].phasestep1 = 0;
seq[index].phasestep2 = 0;
seq[index].duration = TX_LEN_KANAL_PAUSE;
index++;
}
}
/* add postamble */
seq[index].phasestep1 = 0;
seq[index].phasestep2 = 0;
seq[index].duration = TX_LEN_POSTAMBLE;
index++;
} else
if (funktion != FUENF_FUNKTION_TURBO) {
/* add signal */
for (i = 0; i < DSP_NUM_SIGNALS; i++) {
if (signals[i].funktion == funktion)
break;
}
PDEBUG_CHAN(DDSP, DEBUG_DEBUG, " -> Adding call signal of %.0f Hz and %.0f Hz.\n", tone_freq[signals[i].tone1], tone_freq[signals[i].tone2]);
seq[index].phasestep1 = 2.0 * M_PI * tone_freq[signals[i].tone1] * fuenf->sample_duration;
seq[index].phasestep2 = 2.0 * M_PI * tone_freq[signals[i].tone2] * fuenf->sample_duration;
seq[index].duration = TX_LEN_SIGNAL;
index++;
}
#endif
/* check array overflow, if it did not already crashed before */
if (index > (int)(sizeof(fuenf->tx_seq) / sizeof(fuenf->tx_seq[0]))) {
PDEBUG_CHAN(DDSP, DEBUG_ERROR, "Array size of tx_seq too small, please fix!\n");
abort();
}
fuenf->tx_funktion = funktion;
fuenf->tx_seq_length = index;
fuenf->tx_seq_index = 0;
fuenf->tx_count = 0.0;
return index;
}
/* transmit call tone or pause, return 0, if no sequence */
static int encode(fuenf_t *fuenf, sample_t *samples, int length)
{
tone_seq_t *seq;
int count = 0;
double value;
/* no sequence */
if (!fuenf->tx_seq_length)
return 0;
seq = &fuenf->tx_seq[fuenf->tx_seq_index];
/* generate wave */
while (count < length && fuenf->tx_count < seq->duration) {
value = 0;
/* reset phase when not sending sine wave */
if (seq->phasestep1) {
value += sin(fuenf->tx_phase1);
fuenf->tx_phase1 += seq->phasestep1;
} else
fuenf->tx_phase1 = 0.0;
if (seq->phasestep2) {
value += sin(fuenf->tx_phase2);
fuenf->tx_phase2 += seq->phasestep2;
} else
fuenf->tx_phase2 = 0.0;
fuenf->tx_count += fuenf->sample_duration;
*samples++ = value * TONE_LEVEL;
count++;
}
/* transition to next segment */
if (fuenf->tx_count >= seq->duration) {
fuenf->tx_count -= seq->duration;
if (++fuenf->tx_seq_index == fuenf->tx_seq_length) {
fuenf->tx_seq_length = 0;
fuenf_tx_done(fuenf);
}
}
return count;
}
/* Provide stream of audio toward radio unit */
void sender_send(sender_t *sender, sample_t *samples, uint8_t *power, int length)
{
fuenf_t *fuenf = (fuenf_t *) sender;
sample_t *orig_samples = samples;
int orig_length = length;
int count;
sample_t *spl;
int pos;
int i;
/* speak through */
if (fuenf->state == FUENF_STATE_DURCHSAGE && fuenf->callref) {
jitter_load(&fuenf->sender.dejitter, samples, length);
memset(power, 1, length);
} else {
/* send if something has to be sent. else turn transmitter off */
while ((count = encode(fuenf, samples, length))) {
memset(power, 1, count);
samples += count;
power += count;
length -= count;
}
if (length) {
memset(samples, 0, sizeof(samples) * length);
memset(power, 0, length);
}
}
/* Also forward audio to network (call process). */
if (fuenf->callref) {
sample_t copy_samples[orig_length];
// should we always echo back what we talk through???
#if 0
if (fuenf->state == FUENF_STATE_DURCHSAGE)
memset(copy_samples, 0, sizeof(copy_samples));
else
#endif
memcpy(copy_samples, orig_samples, sizeof(copy_samples));
count = samplerate_downsample(&fuenf->sender.srstate, copy_samples, orig_length);
spl = fuenf->sender.rxbuf;
pos = fuenf->sender.rxbuf_pos;
for (i = 0; i < count; i++) {
spl[pos++] = copy_samples[i];
if (pos == 160) {
call_up_audio(fuenf->callref, spl, 160);
pos = 0;
}
}
fuenf->sender.rxbuf_pos = pos;
} else
fuenf->sender.rxbuf_pos = 0;
}
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