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Radio: Add option to change volume of transmission/reception

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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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24
src/radio/radio.c
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@@ -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 */