radio95/fm95
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Code Issues Activity

option to disable agc when max == 0, also don't initialize filters if they're off

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KubaPro010
2025-07-15 22:10:16 +02:00
parent 777993a2d6
commit 59a099c619
1 changed files with 20 additions and 12 deletions
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32
src/fm95.c
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@@ -160,24 +160,28 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
init_oscillator(&osc, (config.stereo == 2) ? 7812.5 : 4750, config.sample_rate);
iirfilt_rrrf lpf_l, lpf_r;
lpf_l = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, config.lpf_order, (config.lpf_cutoff/config.sample_rate), 0.0f, 1.0f, 60.0f);
lpf_r = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, config.lpf_order, (config.lpf_cutoff/config.sample_rate), 0.0f, 1.0f, 60.0f);
if(config.lpf_cutoff != 0) {
lpf_l = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, config.lpf_order, (config.lpf_cutoff/config.sample_rate), 0.0f, 1.0f, 60.0f);
lpf_r = iirfilt_rrrf_create_prototype(LIQUID_IIRDES_CHEBY2, LIQUID_IIRDES_LOWPASS, LIQUID_IIRDES_SOS, config.lpf_order, (config.lpf_cutoff/config.sample_rate), 0.0f, 1.0f, 60.0f);
}
ResistorCapacitor preemp_l, preemp_r;
init_preemphasis(&preemp_l, config.preemphasis, config.sample_rate, config.preemp_unity_freq);
init_preemphasis(&preemp_r, config.preemphasis, config.sample_rate, config.preemp_unity_freq);
if(config.preemphasis != 0) {
init_preemphasis(&preemp_l, config.preemphasis, config.sample_rate, config.preemp_unity_freq);
init_preemphasis(&preemp_r, config.preemphasis, config.sample_rate, config.preemp_unity_freq);
}
BS412Compressor bs412;
init_bs412(&bs412, config.mpx_deviation, config.mpx_power, config.bs412_attack, config.bs412_release, config.bs412_max, config.sample_rate);
TiltCorrectionFilter tilter;
tilt_init(&tilter, config.tilt);
if(config.tilt != 0) tilt_init(&tilter, config.tilt);
StereoEncoder stencode;
init_stereo_encoder(&stencode, 4.0f, &osc, (config.stereo == 2), config.volumes.mono, config.volumes.pilot, config.volumes.stereo);
AGC agc;
initAGC(&agc, config.sample_rate, config.agc_target, config.agc_min, config.agc_max, config.agc_attack, config.agc_release);
if(config.agc_max != 0.0) initAGC(&agc, config.sample_rate, config.agc_target, config.agc_min, config.agc_max, config.agc_attack, config.agc_release);
int pulse_error;
@@ -214,9 +218,11 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
float l = audio_stereo_input[2*i+0]*config.audio_preamp;
float r = audio_stereo_input[2*i+1]*config.audio_preamp;
float agc_gain = process_agc(&agc, 0.5f * (fabsf(l) + fabsf(r)));
l *= agc_gain;
r *= agc_gain;
if(config.agc_max != 0.0) {
float agc_gain = process_agc(&agc, 0.5f * (fabsf(l) + fabsf(r)));
l *= agc_gain;
r *= agc_gain;
}
if(config.lpf_cutoff != 0) {
iirfilt_rrrf_execute(lpf_l, l, &l);
@@ -245,7 +251,7 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
}
}
if(config.bs412_attack > 0) mpx = bs412_compress(&bs412, mpx+mpx_in[i]);
mpx = bs412_compress(&bs412, mpx+mpx_in[i]);
if(config.tilt != 0) mpx = tilt(&tilter, mpx);
output[i] = hard_clip(mpx*config.master_volume, 1.0); // Ensure peak deviation of 75 khz (or the set deviation), assuming we're calibrated correctly
@@ -258,8 +264,10 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
break;
}
}
iirfilt_rrrf_destroy(lpf_l);
iirfilt_rrrf_destroy(lpf_r);
if(config.lpf_cutoff != 0) {
iirfilt_rrrf_destroy(lpf_l);
iirfilt_rrrf_destroy(lpf_r);
}
free(rds_in);
return 0;