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| author | Paul B Mahol <onemda@gmail.com> | 2020-11-28 14:37:06 +0100 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2020-11-28 14:53:17 +0100 |
| commit | 68adb68e96e6ec9003e0601251b8103624088174 (patch) | |
| tree | df0d32b99bf9b8270d142fe986e4ec8450aed652 /libavfilter/af_acrossover.c | |
| parent | ea8c05a3e73d2c69e02fc1c72ad3800d61c96ae6 (diff) | |
| download | ffmpeg-68adb68e96e6ec9003e0601251b8103624088174.tar.gz | |
avfilter/af_acrossover: really fix single-pole allpass coefficients
Now LR2, LR6, LR10, LR14 and LR18 have really flat sum.
Diffstat (limited to 'libavfilter/af_acrossover.c')
| -rw-r--r-- | libavfilter/af_acrossover.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/libavfilter/af_acrossover.c b/libavfilter/af_acrossover.c index f989ac81d9..33a0812c9f 100644 --- a/libavfilter/af_acrossover.c +++ b/libavfilter/af_acrossover.c @@ -211,11 +211,9 @@ static void set_ap(BiquadContext *b, double fc, double q, double sr) static void set_ap1(BiquadContext *b, double fc, double sr) { - double omega = 0.5 * M_PI * fc / sr + M_PI_4; - double cosine = cos(omega); - double sine = sin(omega); + double omega = M_PI * fc / sr; - b->a1 = -cosine / sine; + b->a1 = exp(-omega); b->a2 = 0.; b->b0 = -b->a1; b->b1 = 1.; |