void quisk_set_tx_mode(void) // called when the mode rxMode is changed
{
tx_filter(NULL, 0);
tx_filter2(NULL, 0);
#ifdef TEST_TX_WAV_FILE
if (!wavFp) // convenient place to open file
open_wav();
#endif
}
void CODEC2_WIN32SUPPORT fdmdv_mod(struct FDMDV *fdmdv, COMP tx_fdm[],
int tx_bits[], int *sync_bit)
{
COMP tx_symbols[NC+1];
COMP tx_baseband[NC+1][M];
bits_to_dqpsk_symbols(tx_symbols, fdmdv->prev_tx_symbols, tx_bits, &fdmdv->tx_pilot_bit);
memcpy(fdmdv->prev_tx_symbols, tx_symbols, sizeof(COMP)*(NC+1));
tx_filter(tx_baseband, tx_symbols, fdmdv->tx_filter_memory);
fdm_upconvert(tx_fdm, tx_baseband, fdmdv->phase_tx, fdmdv->freq);
*sync_bit = fdmdv->tx_pilot_bit;
}
int quisk_process_microphone(complex * cSamples, int count)
{
int i, sample, maximum;
double d;
static double fmPhase = CLIP16;
#if 0
// Measure soundcard actual sample rate
static time_t seconds = 0;
static long total = 0;
struct timeb tb;
static double dtime;
ftime(&tb);
total += count;
if (seconds == 0) {
seconds = tb.time;
dtime = tb.time + .001 * tb.millitm;
}
else if (tb.time - seconds > 4) {
printf("Mic soundcard rate %.3f\n", total / (tb.time + .001 * tb.millitm - dtime));
seconds = tb.time;
printf("backlog %d, count %d\n", backlog, count);
}
#endif
#ifdef TEST_TX_WAV_FILE
get_wav(cSamples, count); // replace audio samples with sound from a WAV file
#endif
#if USE_GET_SIN
get_sin(cSamples, count); // Replace mic samples with a sin wave, and send it
#endif
maximum = 1;
for (i = 0; i < count; i++) { // measure maximum microphone level for display
cSamples[i] *= (double)CLIP16 / CLIP32; // convert 32-bit samples to 16 bits
d = creal(cSamples[i]);
sample = (int)fabs(d);
if (sample > maximum)
maximum = sample;
}
if (maximum > mic_level)
mic_level = maximum;
mic_timer -= count; // time out the max microphone level to display
if (mic_timer <= 0) {
mic_timer = quisk_sound_state.mic_sample_rate / 1000 * MIC_MAX_HOLD_TIME;
mic_max_display = mic_level;
mic_level = 1;
}
if (quisk_is_key_down())
switch (rxMode) {
case 2: // LSB
case 3: // USB
if (spotMode == 0) {
tx_filter(cSamples, count); // filter samples
transmit_udp(cSamples, count);
}
else if (spotMode == 1)
transmit_mic_carrier(cSamples, count, 0.5);
else
transmit_mic_carrier(cSamples, count, 1.0);
break;
case 4: // AM
tx_filter2(cSamples, count);
for (i = 0; i < count; i++) // transmit (0.5 + ampl/2, 0)
cSamples[i] = (creal(cSamples[i]) + CLIP16) * 0.5;
transmit_udp(cSamples, count);
break;
case 5999: // FM
tx_filter2(cSamples, count);
for (i = 0; i < count; i++) { // transmit +/- 5000 Hz tone
fmPhase *= cexp( - I * 2.0 * M_PI * (5000.0 * creal(cSamples[i]) / CLIP16) /
quisk_sound_state.mic_sample_rate);
cSamples[i] = fmPhase;
}
transmit_udp(cSamples, count);
break;
case 10: // transmit IMD 2-tone test
transmit_mic_imd(cSamples, count, 1.0);
break;
case 11:
transmit_mic_imd(cSamples, count, 1.0 / sqrt(2.0));
break;
case 12:
transmit_mic_imd(cSamples, count, 0.5);
break;
}
else
fmPhase = CLIP16;
return count;
}
