ffmpeg | branch: master | Paul B Mahol <onemda@gmail.com> | Fri May 27 09:36:19 2022 +0200| [93b31dae1dec4c2b3e6c63a7e9f5b344b849126c] | committer: Paul B Mahol avfilter/af_biquads: fix low/highshelf 'k' calculation

http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=93b31dae1dec4c2b3e...

libavfilter/af_biquads.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c index 0687bc31e9..26cb4d49bb 100644 --- a/libavfilter/af_biquads.c +++ b/libavfilter/af_biquads.c @@ -690,7 +690,7 @@ static void convert_dir2zdf(BiquadsContext *s, int sample_rate) case lowshelf: A = ff_exp10(s->gain / 40.); 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[1] = g * a[0]; a[2] = g * a[1]; @@ -702,7 +702,7 @@ static void convert_dir2zdf(BiquadsContext *s, int sample_rate) case highshelf: A = ff_exp10(s->gain / 40.); 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[1] = g * a[0]; a[2] = g * a[1];