radio95/fm95
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more optimizations

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This commit is contained in:
KubaPro010
2026-02-19 17:32:29 +01:00
parent fc66e2a467
commit ca4098f8b1
2 changed files with 13 additions and 20 deletions
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29
filter/bs412.c
View File

@@ -37,23 +37,14 @@ float bs412_compress(BS412Compressor* comp, float audio, float sample_mpx) {
comp->avg_power += comp->alpha * ((comp->last_output * comp->last_output * comp->mpx_deviation * comp->mpx_deviation) - comp->avg_power); comp->avg_power += comp->alpha * ((comp->last_output * comp->last_output * comp->mpx_deviation * comp->mpx_deviation) - comp->avg_power);
float avg_deviation = sqrtf(comp->avg_power); if(comp->sample_counter % 4 == 0) {
float modulation_power = deviation_to_dbr(avg_deviation); comp->avg_deviation = sqrtf(comp->avg_power);
comp->modulation_power = deviation_to_dbr(comp->avg_deviation);
if(comp->target <= -100.0f) {
#ifdef BS412_DEBUG
if(comp->sample_counter > comp->sample_rate) {
debug_printf("MPX power: %.2f dBr (%.1f Hz)\n", modulation_power, avg_deviation);
comp->sample_counter = 0;
}
#endif
comp->sample_counter++;
return combined;
} }
if(comp->sample_counter > comp->sample_rate) { if(comp->sample_counter > comp->sample_rate) {
#ifdef BS412_DEBUG #ifdef BS412_DEBUG
debug_printf("MPX power: %.2f dBr with gain %.2fx (%.2f dBr)\n", modulation_power, mpx->gain, deviation_to_dbr(avg_deviation * mpx->gain)); debug_printf("MPX power: %.2f dBr with gain %.2fx (%.2f dBr)\n", comp->modulation_power, mpx->gain, deviation_to_dbr(comp->avg_deviation * mpx->gain));
#endif #endif
comp->sample_counter = 0; comp->sample_counter = 0;
if(comp->can_compress == 0) comp->second_counter++; if(comp->can_compress == 0) comp->second_counter++;
@@ -63,7 +54,6 @@ float bs412_compress(BS412Compressor* comp, float audio, float sample_mpx) {
#ifdef BS412_DEBUG #ifdef BS412_DEBUG
debug_printf("Can compress.\n"); debug_printf("Can compress.\n");
#endif #endif
comp->gain = powf(10.0f, (comp->target - modulation_power) / 10.0f);
comp->can_compress = 1; comp->can_compress = 1;
} }
@@ -72,17 +62,18 @@ float bs412_compress(BS412Compressor* comp, float audio, float sample_mpx) {
return combined; return combined;
} }
float target_gain = expf((comp->target - modulation_power) * 0.2302585093f); // 1/10 * ln(10) float target_gain = expf((comp->target - comp->modulation_power) * 0.2302585093f); // 1/10 * ln(10)
if (modulation_power > comp->target) comp->gain = comp->attack * comp->gain + (1.0f - comp->attack) * target_gain; if (comp->modulation_power > comp->target) comp->gain = comp->attack * comp->gain + (1.0f - comp->attack) * target_gain;
else comp->gain = comp->release * comp->gain + (1.0f - comp->release) * target_gain; else comp->gain = comp->release * comp->gain + (1.0f - comp->release) * target_gain;
comp->gain = CLAMP(comp->gain, 0.0f, comp->max_gain); comp->gain = CLAMP(comp->gain, 0.0f, comp->max_gain);
float output_sample = (audio * comp->gain) + sample_mpx; float output_sample = (audio * comp->gain) + sample_mpx;
if(deviation_to_dbr(avg_deviation * comp->gain) > comp->target && modulation_power < comp->target) { float dev_after_gain = deviation_to_dbr(comp->avg_deviation * comp->gain);
if(dev_after_gain > comp->target && comp->modulation_power < comp->target) {
// Gain is too much, reduce // Gain is too much, reduce
float overshoot_dbr = deviation_to_dbr(avg_deviation * comp->gain) - comp->target; float overshoot_dbr = dev_after_gain - comp->target;
float reduction_factor = powf(10.0f, -overshoot_dbr / 10.0f); float reduction_factor = expf((-overshoot_dbr) * 0.2302585093f);
comp->gain *= reduction_factor; comp->gain *= reduction_factor;
comp->gain = fmaxf(0.01f, fminf(comp->max_gain, comp->gain)); comp->gain = fmaxf(0.01f, fminf(comp->max_gain, comp->gain));
} }

4
filter/bs412.h
View File

@@ -22,10 +22,12 @@ typedef struct
float max_gain; float max_gain;
float gain; float gain;
double avg_power; double avg_power;
double alpha; float alpha;
uint8_t can_compress : 1; uint8_t can_compress : 1;
uint8_t second_counter; uint8_t second_counter;
float last_output; float last_output;
float avg_deviation;
float modulation_power;
} BS412Compressor; } BS412Compressor;
// float dbr_to_deviation(float dbr); // float dbr_to_deviation(float dbr);