radio95/fm95
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bs412 things

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This commit is contained in:
kuba
2026-05-10 18:09:56 +02:00
parent bdac9ac88b
commit 335dd4683f
3 changed files with 21 additions and 9 deletions
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filter/bs412.c
+6 -4
View File
@@ -9,10 +9,10 @@ inline float power_to_dbr(float power, float ref) {
return 10*log10f(power / ref);
}
void init_bs412(BS412Compressor* comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db, uint32_t sample_rate) {
void init_bs412(BS412Compressor* comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db, float strenght, uint32_t sample_rate) {
comp->reference = (19000.0f / mpx_deviation) * (19000.0f / mpx_deviation);
comp->avg_power = 0.0f;
comp->alpha = 1.0f / (BS412_TIME * sample_rate);
comp->alpha = 1.0f - expf(-1.0f / (BS412_TIME * sample_rate));
comp->sample_rate = sample_rate;
comp->attack = expf(-1.0f / (attack * sample_rate));
comp->release = expf(-1.0f / (release * sample_rate));
@@ -25,12 +25,13 @@ void init_bs412(BS412Compressor* comp, uint32_t mpx_deviation, float target_powe
comp->gate_threshold = comp->reference * powf(10.0f, gate / 10.0f);
comp->knee_db = knee_db; // e.g. 6.0f — width in dB around target on each side
comp->init = true;
comp->strenght = strenght;
#ifdef BS412_DEBUG
debug_printf("Initialized MPX power measurement with sample rate: %d\n", sample_rate);
#endif
}
void reinit_bs412(BS412Compressor* comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db) {
void reinit_bs412(BS412Compressor* comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db, float strenght) {
comp->reference = (19000.0f / mpx_deviation) * (19000.0f / mpx_deviation);
comp->target = comp->reference * powf(10.0f, target_power / 10.0f);
comp->target_dbr = power_to_dbr(comp->target, comp->reference);
@@ -39,6 +40,7 @@ void reinit_bs412(BS412Compressor* comp, uint32_t mpx_deviation, float target_po
comp->release = expf(-1.0f / (release * comp->sample_rate));
comp->max_gain = max_gain;
comp->knee_db = knee_db;
comp->strenght = strenght;
}
float bs412_compress(BS412Compressor* comp, float audio, float sample_mpx, float* mpx_power) {
@@ -66,7 +68,7 @@ float bs412_compress(BS412Compressor* comp, float audio, float sample_mpx, float
}
float safe_power = fmaxf(comp->avg_power, 1e-12f);
float target_gain = sqrtf(comp->target / safe_power);
float target_gain = powf(sqrtf(comp->target / safe_power), comp->strenght);
float level_dbr = power_to_dbr(comp->avg_power, comp->reference);
float half_knee = comp->knee_db * 0.5f;
filter/bs412.h
+3 -2
View File
@@ -30,8 +30,9 @@ typedef struct {
float gate_threshold;
bool init;
float knee_db;
float strenght;
} BS412Compressor;
void init_bs412(BS412Compressor *comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db, uint32_t sample_rate);
void reinit_bs412(BS412Compressor *comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db);
void init_bs412(BS412Compressor *comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db, float strenght, uint32_t sample_rate);
void reinit_bs412(BS412Compressor *comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, float gate, float knee_db, float strenght);
float bs412_compress(BS412Compressor *comp, float audio, float sample_mpx, float* mpx_power);