diff options
Diffstat (limited to 'libavfilter/af_aiir.c')
| -rw-r--r-- | libavfilter/af_aiir.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c index c5df4b1202..64bd78ad8a 100644 --- a/libavfilter/af_aiir.c +++ b/libavfilter/af_aiir.c @@ -877,23 +877,17 @@ static void convert_sp2zp(AVFilterContext *ctx, int channels) for (n = 0; n < iir->nb_ab[0]; n++) { double sr = iir->ab[0][2*n]; double si = iir->ab[0][2*n+1]; - double snr = 1. + sr; - double sdr = 1. - sr; - double div = sdr * sdr + si * si; - iir->ab[0][2*n] = (snr * sdr - si * si) / div; - iir->ab[0][2*n+1] = (sdr * si + snr * si) / div; + iir->ab[0][2*n] = exp(sr) * cos(si); + iir->ab[0][2*n+1] = exp(sr) * sin(si); } for (n = 0; n < iir->nb_ab[1]; n++) { double sr = iir->ab[1][2*n]; double si = iir->ab[1][2*n+1]; - double snr = 1. + sr; - double sdr = 1. - sr; - double div = sdr * sdr + si * si; - iir->ab[1][2*n] = (snr * sdr - si * si) / div; - iir->ab[1][2*n+1] = (sdr * si + snr * si) / div; + iir->ab[1][2*n] = exp(sr) * cos(si); + iir->ab[1][2*n+1] = exp(sr) * sin(si); } } } |