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avfilter/af_biquads: fix low/highshelf 'k' calculation

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This commit is contained in:
Paul B Mahol 2022-05-27 09:36:19 +02:00
parent f912cefb83
commit 93b31dae1d
1 changed files with 2 additions and 2 deletions
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4
libavfilter/af_biquads.c
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@ -690,7 +690,7 @@ static void convert_dir2zdf(BiquadsContext *s, int sample_rate)
case lowshelf: case lowshelf:
A = ff_exp10(s->gain / 40.); A = ff_exp10(s->gain / 40.);
g = tan(M_PI * s->frequency / sample_rate) / sqrt(A); g = tan(M_PI * s->frequency / sample_rate) / sqrt(A);
k = 1. / (Q * A); k = 1. / Q;
a[0] = 1. / (1. + g * (g + k)); a[0] = 1. / (1. + g * (g + k));
a[1] = g * a[0]; a[1] = g * a[0];
a[2] = g * a[1]; a[2] = g * a[1];
@ -702,7 +702,7 @@ static void convert_dir2zdf(BiquadsContext *s, int sample_rate)
case highshelf: case highshelf:
A = ff_exp10(s->gain / 40.); A = ff_exp10(s->gain / 40.);
g = tan(M_PI * s->frequency / sample_rate) / sqrt(A); g = tan(M_PI * s->frequency / sample_rate) / sqrt(A);
k = 1. / (Q * A); k = 1. / Q;
a[0] = 1. / (1. + g * (g + k)); a[0] = 1. / (1. + g * (g + k));
a[1] = g * a[0]; a[1] = g * a[0];
a[2] = g * a[1]; a[2] = g * a[1];