Radio: Add option to change volume of transmission/reception
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1eac087935
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41ee8239df
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@ -63,6 +63,7 @@ static double bandwidth = 0.0;
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static double deviation = 75000.0;
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static double modulation_index = 1.0;
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static double time_constant_us = 50.0;
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static double volume = 1.0;
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static int stereo = 0;
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static int rds = 0;
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static int rds2 = 0;
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@ -138,6 +139,8 @@ void print_help(const char *arg0)
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printf(" modulation. Give 0 to disbale. (default = %.0f uS)\n", time_constant_us);
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printf(" VHF broadcast 50 uS in Europe and 75 uS in the United States.\n");
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printf(" Other radio FM should use 530 uS, to cover complete speech spectrum.\n");
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printf(" -V --volume %.3f\n", volume);
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printf(" Change volume of radio side. (Gains transmission, dampens reception)\n");
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printf(" -S --stereo\n");
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printf(" Enables stereo carrier for frequency modulated UHF broadcast.\n");
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printf(" It uses the 'Pilot-tone' system.\n");
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@ -169,6 +172,7 @@ static void add_options(void)
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option_add('D', "deviation", 1);
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option_add('I', "modulation-index", 1);
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option_add('E', "emphasis", 1);
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option_add('V', "volume", 1);
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option_add('S', "stereo", 0);
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option_add(OPT_FAST_MATH, "fast-math", 0);
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option_add(OPT_LIMESDR, "limesdr", 0);
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@ -238,6 +242,9 @@ static int handle_options(int short_option, int argi, char **argv)
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case 'E':
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time_constant_us = atof(argv[argi]);
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break;
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case 'V':
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volume = atof(argv[argi]);
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break;
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case 'S':
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stereo = 1;
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break;
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@ -348,7 +355,7 @@ int main(int argc, char *argv[])
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/* now we have latency and sample rate */
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latspl = samplerate * latency / 1000;
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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);
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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);
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if (rc < 0) {
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fprintf(stderr, "Failed to initialize radio with given options, exitting!\n");
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exit(0);
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@ -36,7 +36,7 @@
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#define PILOT_FREQ 19000.0
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#define PILOT_BW 5.0
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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)
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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)
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{
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int rc = -EINVAL;
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@ -44,6 +44,7 @@ int radio_init(radio_t *radio, int latspl, int samplerate, const char *tx_wave_f
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memset(radio, 0, sizeof(*radio));
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radio->latspl = latspl;
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radio->volume = volume;
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radio->stereo = stereo;
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radio->rds = rds;
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radio->rds2 = rds2;
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@ -457,6 +458,7 @@ int radio_tx(radio_t *radio, float *baseband, int signal_num)
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switch (radio->tx_audio_mode) {
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case AUDIO_MODE_WAVEFILE:
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wave_read(&radio->wave_tx_play, audio_samples, audio_num);
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if (!radio->wave_tx_play.left) {
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int rc;
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int _samplerate = 0;
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@ -527,6 +529,16 @@ int radio_tx(radio_t *radio, float *baseband, int signal_num)
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if (radio->stereo)
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iir_process(&radio->tx_dc_removal[1], audio_samples[1], audio_num);
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/* gain volume */
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if (radio->volume != 1.0) {
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for (i = 0; i < audio_num; i++)
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audio_samples[0][i] *= radio->volume;
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if (radio->stereo) {
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for (i = 0; i < audio_num; i++)
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audio_samples[1][i] *= radio->volume;
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}
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}
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/* upsample */
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signal_num = samplerate_upsample(&radio->tx_resampler[0], audio_samples[0], audio_num, signal_samples[0]);
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if (radio->stereo)
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@ -654,6 +666,16 @@ int radio_rx(radio_t *radio, float *baseband, int signal_num)
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if (radio->stereo)
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samplerate_downsample(&radio->rx_resampler[1], samples[1], signal_num);
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/* dampen volume */
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if (radio->volume != 1.0) {
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for (i = 0; i < audio_num; i++)
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samples[0][i] /= radio->volume;
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if (radio->stereo) {
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for (i = 0; i < audio_num; i++)
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samples[1][i] /= radio->volume;
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}
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}
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/* convert mono/stereo, (from differential signal) */
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if (radio->stereo && radio->rx_audio_channels == 1) {
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/* stereo to mono */
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@ -27,6 +27,7 @@ typedef struct radio {
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enum modulation modulation; /* modulation type */
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enum audio_mode tx_audio_mode; /* mode for audio source */
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enum audio_mode rx_audio_mode; /* mode for audio sink */
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double volume; /* volume change (gain/dampen) */
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int stereo; /* use stere FM */
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int rds, rds2; /* use RDS */
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/* audio stage */
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@ -77,7 +78,7 @@ typedef struct radio {
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sample_t *carrier_buffer;
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} radio_t;
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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);
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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);
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void radio_exit(radio_t *radio);
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int radio_start(radio_t *radio);
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int radio_tx(radio_t *radio, float *baseband, int num);
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