diff options
Diffstat (limited to 'libavfilter')
| -rw-r--r-- | libavfilter/af_aiir.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c index 55828c1a82..717388f450 100644 --- a/libavfilter/af_aiir.c +++ b/libavfilter/af_aiir.c @@ -601,18 +601,22 @@ 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]; - factor = (iir->biquads[current_biquad].a[0] + - iir->biquads[current_biquad].a[1] + - iir->biquads[current_biquad].a[2]) / - (iir->biquads[current_biquad].b[0] + - iir->biquads[current_biquad].b[1] + - iir->biquads[current_biquad].b[2]); - - av_log(ctx, AV_LOG_VERBOSE, "factor=%f\n", factor); - - iir->biquads[current_biquad].b[0] *= factor; - iir->biquads[current_biquad].b[1] *= factor; - iir->biquads[current_biquad].b[2] *= factor; + 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]) / + (iir->biquads[current_biquad].b[0] + + iir->biquads[current_biquad].b[1] + + iir->biquads[current_biquad].b[2]); + + av_log(ctx, AV_LOG_VERBOSE, "factor=%f\n", factor); + + 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); |