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osmocom-analog
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Radio: Add option to change volume of transmission/reception

This commit is contained in:
Andreas Eversberg 2019-07-05 21:50:24 +02:00
parent 1eac087935
commit 41ee8239df
3 changed files with 33 additions and 3 deletions
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9
src/radio/main.c
View File

@ -63,6 +63,7 @@ static double bandwidth = 0.0;
static double deviation = 75000.0;
static double modulation_index = 1.0;
static double time_constant_us = 50.0;
static double volume = 1.0;
static int stereo = 0;
static int rds = 0;
static int rds2 = 0;
@ -138,6 +139,8 @@ void print_help(const char *arg0)
printf(" modulation. Give 0 to disbale. (default = %.0f uS)\n", time_constant_us);
printf(" VHF broadcast 50 uS in Europe and 75 uS in the United States.\n");
printf(" Other radio FM should use 530 uS, to cover complete speech spectrum.\n");
printf(" -V --volume %.3f\n", volume);
printf(" Change volume of radio side. (Gains transmission, dampens reception)\n");
printf(" -S --stereo\n");
printf(" Enables stereo carrier for frequency modulated UHF broadcast.\n");
printf(" It uses the 'Pilot-tone' system.\n");
@ -169,6 +172,7 @@ static void add_options(void)
option_add('D', "deviation", 1);
option_add('I', "modulation-index", 1);
option_add('E', "emphasis", 1);
option_add('V', "volume", 1);
option_add('S', "stereo", 0);
option_add(OPT_FAST_MATH, "fast-math", 0);
option_add(OPT_LIMESDR, "limesdr", 0);
@ -238,6 +242,9 @@ static int handle_options(int short_option, int argi, char **argv)
case 'E':
time_constant_us = atof(argv[argi]);
break;
case 'V':
volume = atof(argv[argi]);
break;
case 'S':
stereo = 1;
break;
@ -348,7 +355,7 @@ int main(int argc, char *argv[])
/* now we have latency and sample rate */
latspl = samplerate * latency / 1000;
rc = radio_init(&radio, latspl, samplerate, tx_wave_file, rx_wave_file, (tx) ? tx_audiodev : NULL, (rx) ? rx_audiodev : NULL, modulation, bandwidth, deviation, modulation_index, time_constant_us, stereo, rds, rds2);
rc = radio_init(&radio, latspl, samplerate, tx_wave_file, rx_wave_file, (tx) ? tx_audiodev : NULL, (rx) ? rx_audiodev : NULL, modulation, bandwidth, deviation, modulation_index, time_constant_us, volume, stereo, rds, rds2);
if (rc < 0) {
fprintf(stderr, "Failed to initialize radio with given options, exitting!\n");
exit(0);

24
src/radio/radio.c
View File

@ -36,7 +36,7 @@
#define PILOT_FREQ 19000.0
#define PILOT_BW 5.0
int radio_init(radio_t *radio, int latspl, int samplerate, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant_us, int stereo, int rds, int rds2)
int radio_init(radio_t *radio, int latspl, int samplerate, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant_us, double volume, int stereo, int rds, int rds2)
{
int rc = -EINVAL;
@ -44,6 +44,7 @@ int radio_init(radio_t *radio, int latspl, int samplerate, const char *tx_wave_f
memset(radio, 0, sizeof(*radio));
radio->latspl = latspl;
radio->volume = volume;
radio->stereo = stereo;
radio->rds = rds;
radio->rds2 = rds2;
@ -457,6 +458,7 @@ int radio_tx(radio_t *radio, float *baseband, int signal_num)
switch (radio->tx_audio_mode) {
case AUDIO_MODE_WAVEFILE:
wave_read(&radio->wave_tx_play, audio_samples, audio_num);
if (!radio->wave_tx_play.left) {
int rc;
int _samplerate = 0;
@ -527,6 +529,16 @@ int radio_tx(radio_t *radio, float *baseband, int signal_num)
if (radio->stereo)
iir_process(&radio->tx_dc_removal[1], audio_samples[1], audio_num);
/* gain volume */
if (radio->volume != 1.0) {
for (i = 0; i < audio_num; i++)
audio_samples[0][i] *= radio->volume;
if (radio->stereo) {
for (i = 0; i < audio_num; i++)
audio_samples[1][i] *= radio->volume;
}
}
/* upsample */
signal_num = samplerate_upsample(&radio->tx_resampler[0], audio_samples[0], audio_num, signal_samples[0]);
if (radio->stereo)
@ -654,6 +666,16 @@ int radio_rx(radio_t *radio, float *baseband, int signal_num)
if (radio->stereo)
samplerate_downsample(&radio->rx_resampler[1], samples[1], signal_num);
/* dampen volume */
if (radio->volume != 1.0) {
for (i = 0; i < audio_num; i++)
samples[0][i] /= radio->volume;
if (radio->stereo) {
for (i = 0; i < audio_num; i++)
samples[1][i] /= radio->volume;
}
}
/* convert mono/stereo, (from differential signal) */
if (radio->stereo && radio->rx_audio_channels == 1) {
/* stereo to mono */

3
src/radio/radio.h
View File

@ -27,6 +27,7 @@ typedef struct radio {
enum modulation modulation; /* modulation type */
enum audio_mode tx_audio_mode; /* mode for audio source */
enum audio_mode rx_audio_mode; /* mode for audio sink */
double volume; /* volume change (gain/dampen) */
int stereo; /* use stere FM */
int rds, rds2; /* use RDS */
/* audio stage */
@ -77,7 +78,7 @@ typedef struct radio {
sample_t *carrier_buffer;
} radio_t;
int radio_init(radio_t *radio, int latspl, int samplerate, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant, int stereo, int rds, int rds2);
int radio_init(radio_t *radio, int latspl, int samplerate, const char *tx_wave_file, const char *rx_wave_file, const char *tx_audiodev, const char *rx_audiodev, enum modulation modulation, double bandwidth, double deviation, double modulation_index, double time_constant, double volume, int stereo, int rds, int rds2);
void radio_exit(radio_t *radio);
int radio_start(radio_t *radio);
int radio_tx(radio_t *radio, float *baseband, int num);