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avfilter/af_aiir: fix sp2zp mapping

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This commit is contained in:
Paul B Mahol 2020-10-19 18:34:50 +02:00
parent 3e4214109a
commit f7379eafd2
1 changed files with 4 additions and 10 deletions
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14
libavfilter/af_aiir.c
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@ -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);
}
}
}