ffmpeg | branch: master | Paul B Mahol <[email protected]> | Fri Nov 27 15:33:13 2020 +0100| [551ca67afe7555368758c4aab476978689380a6d] | committer: Paul B Mahol
avfilter/af_acrossover: fix single pole allpass coefficients > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=551ca67afe7555368758c4aab476978689380a6d --- libavfilter/af_acrossover.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/libavfilter/af_acrossover.c b/libavfilter/af_acrossover.c index 98bd6fe7a9..550d4ddbaf 100644 --- a/libavfilter/af_acrossover.c +++ b/libavfilter/af_acrossover.c @@ -209,10 +209,11 @@ static void set_ap(BiquadContext *b, double fc, double q, double sr) static void set_ap1(BiquadContext *b, double fc, double sr) { - double omega = M_PI * fc / sr; - double K = tan(omega); + double omega = 0.5 * M_PI * fc / sr + M_PI_4; + double cosine = cos(omega); + double sine = sin(omega); - b->a1 = -(1. - K) / (1. + K); + b->a1 = -cosine / sine; b->a2 = 0.; b->b0 = -b->a1; b->b1 = 1.; _______________________________________________ ffmpeg-cvslog mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
