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avfilter/af_aiir: normalize biquads only if divisor is big enough

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This commit is contained in:
Paul B Mahol 2019-11-22 21:06:35 +01:00
parent f46b04c4c3
commit 89aa1342b1
1 changed files with 14 additions and 10 deletions
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4
libavfilter/af_aiir.c
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@ -601,6 +601,9 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
iir->biquads[current_biquad].b[1] = b[2] / a[4];
iir->biquads[current_biquad].b[2] = b[0] / a[4];
if (fabs(iir->biquads[current_biquad].b[0] +
iir->biquads[current_biquad].b[1] +
iir->biquads[current_biquad].b[2]) > 1e-6) {
factor = (iir->biquads[current_biquad].a[0] +
iir->biquads[current_biquad].a[1] +
iir->biquads[current_biquad].a[2]) /
@ -613,6 +616,7 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
iir->biquads[current_biquad].b[0] *= factor;
iir->biquads[current_biquad].b[1] *= factor;
iir->biquads[current_biquad].b[2] *= factor;
}
iir->biquads[current_biquad].b[0] *= (current_biquad ? 1.0 : iir->g);
iir->biquads[current_biquad].b[1] *= (current_biquad ? 1.0 : iir->g);