radio95/fm95
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add a audio preamp value to fm95

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This commit is contained in:
KubaPro010
2025-07-06 21:59:15 +02:00
parent 1bdb7bb35b
commit f9465cd1f5
2 changed files with 8 additions and 3 deletions
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9
src/fm95.c
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@@ -36,6 +36,7 @@
#define DEFAULT_MASTER_VOLUME 1.0f // Volume of everything combined, for calibration
#define DEFAULT_AUDIO_VOLUME 1.0f // Audio volume, before clipper
#define DEFAULT_AUDIO_PREAMP 1.0f // Audio volume, but before all the filters
#define MONO_VOLUME 0.45f // 45%
#define PILOT_VOLUME 0.09f // 9%
@@ -60,6 +61,7 @@ typedef struct
float mpx_deviation;
float master_volume;
float audio_volume;
float audio_preamp;
uint32_t sample_rate;
@@ -199,8 +201,8 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
for (uint16_t i = 0; i < BUFFER_SIZE; i++) {
float mpx = 0.0f;
float ready_l = apply_preemphasis(&preemp_l, audio_stereo_input[2*i+0]);
float ready_r = apply_preemphasis(&preemp_r, audio_stereo_input[2*i+1]);
float ready_l = apply_preemphasis(&preemp_l, audio_stereo_input[2*i+0]*config.audio_preamp);
float ready_r = apply_preemphasis(&preemp_r, audio_stereo_input[2*i+1]*config.audio_preamp);
iirfilt_rrrf_execute(lpf_l, ready_l, &ready_l);
iirfilt_rrrf_execute(lpf_r, ready_r, &ready_r);
@@ -320,6 +322,8 @@ static int config_handler(void* user, const char* section, const char* name, con
pconfig->master_volume = strtof(value, NULL);
} else if (MATCH("fm95", "audio_volume")) {
pconfig->audio_volume = strtof(value, NULL);
} else if (MATCH("fm95", "audio_preamp")) {
pconfig->audio_preamp = strtof(value, NULL);
} else if (MATCH("fm95", "deviation")) {
pconfig->master_volume *= (strtof(value, NULL) / 75000.0f);
} else if(MATCH("advanced", "lpf_order")) {
@@ -427,6 +431,7 @@ int main(int argc, char **argv) {
.mpx_deviation = DEFAULT_MPX_DEVIATION,
.master_volume = DEFAULT_MASTER_VOLUME,
.audio_volume = DEFAULT_AUDIO_VOLUME,
.audio_preamp = DEFAULT_AUDIO_PREAMP,
.sample_rate = DEFAULT_SAMPLE_RATE,