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precompute part of dev to dbr

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KubaPro010
2026-02-15 16:01:55 +01:00
parent 4451b40cdd
commit 5ab604ddba
1 changed files with 3 additions and 1 deletions
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4
filter/bs412.c
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@@ -2,13 +2,15 @@
#define BS412_TIME 60 #define BS412_TIME 60
#define SQRT19000 180499999.99999997f // (19000 / sqrt(2)) * 19000 / sqrt(2)
// inline float dbr_to_deviation(float dbr) { // inline float dbr_to_deviation(float dbr) {
// return 19000.0f * sqrtf(pow(10.0, dbr / 10.0)); // return 19000.0f * sqrtf(pow(10.0, dbr / 10.0));
// } // }
inline float deviation_to_dbr(float deviation) { inline float deviation_to_dbr(float deviation) {
if (deviation < 1e-6f) return -100.0f; if (deviation < 1e-6f) return -100.0f;
return 10*log10f((deviation*deviation)/((19000.0f / sqrtf(2.0f)) * (19000.0f / sqrtf(2.0f)))); return 10*log10f((deviation*deviation)/(SQRT19000 * SQRT19000));
} }
void init_bs412(BS412Compressor* mpx, uint32_t mpx_deviation, float target_power, float attack, float release, uint32_t sample_rate) { void init_bs412(BS412Compressor* mpx, uint32_t mpx_deviation, float target_power, float attack, float release, uint32_t sample_rate) {