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| author | Paul B Mahol <onemda@gmail.com> | 2019-11-22 21:06:35 +0100 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2019-11-22 21:10:43 +0100 |
| commit | 89aa1342b1e5a48d9c55d9af71e8a8151e101bf2 (patch) | |
| tree | cdd94986fe6ab3314e214b2cc6375e2b327ed32e /libavfilter/af_aiir.c | |
| parent | f46b04c4c32849a789a5aadc27fff3c3c60fc596 (diff) | |
| download | ffmpeg-89aa1342b1e5a48d9c55d9af71e8a8151e101bf2.tar.gz | |
avfilter/af_aiir: normalize biquads only if divisor is big enough
Diffstat (limited to 'libavfilter/af_aiir.c')
| -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); |