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avfilter/af_biquads: fix error in ro calculation

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This commit is contained in:
Paul B Mahol 2020-12-17 15:12:40 +01:00
parent 331858d0f6
commit 1eb751955e
1 changed files with 2 additions and 2 deletions
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4
libavfilter/af_biquads.c
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@ -516,7 +516,7 @@ static int config_filter(AVFilterLink *outlink, int reset)
case lowshelf:
if (s->poles == 1) {
double A = ff_exp10(s->gain / 20);
double ro = -sin(w0 / 2. - M_PI_4 / (sin(w0 / 2. + M_PI_4)));
double ro = -sin(w0 / 2. - M_PI_4) / sin(w0 / 2. + M_PI_4);
double n = (A + 1) / (A - 1);
double alpha1 = A == 1. ? 0. : n - FFSIGN(n) * sqrt(n * n - 1);
double beta0 = ((1 + A) + (1 - A) * alpha1) * 0.5;
@ -542,7 +542,7 @@ static int config_filter(AVFilterLink *outlink, int reset)
case highshelf:
if (s->poles == 1) {
double A = ff_exp10(s->gain / 20);
double ro = sin(w0 / 2. - M_PI_4 / (sin(w0 / 2. + M_PI_4)));
double ro = sin(w0 / 2. - M_PI_4) / sin(w0 / 2. + M_PI_4);
double n = (A + 1) / (A - 1);
double alpha1 = A == 1. ? 0. : n - FFSIGN(n) * sqrt(n * n - 1);
double beta0 = ((1 + A) + (1 - A) * alpha1) * 0.5;