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avfilter/af_aiir: reverse order of biquads in serial processing 

This avoids most of clippings for fixed-point precision inputs.
Also add warning about filtering fixed-point precision with parallel processing.
This commit is contained in:
Paul B Mahol 2020-10-17 18:23:35 +02:00
parent 33624f4f2e
commit 7c1eef48e1
1 changed files with 3 additions and 1 deletions
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4
libavfilter/af_aiir.c
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@ -195,7 +195,7 @@ static int iir_ch_serial_## name(AVFilterContext *ctx, void *arg, \
int nb_biquads = (FFMAX(iir->nb_ab[0], iir->nb_ab[1]) + 1) / 2; \
int n, i; \
\
for (i = 0; i < nb_biquads; i++) { \
for (i = nb_biquads - 1; i >= 0; i--) { \
const double a1 = -iir->biquads[i].a[1]; \
const double a2 = -iir->biquads[i].a[2]; \
const double b0 = iir->biquads[i].b[0]; \
@ -1226,6 +1226,8 @@ static int config_output(AVFilterLink *outlink)
if (ret < 0)
return ret;
} else if (s->format > 0 && s->process == 2) {
if (s->precision > 1)
av_log(ctx, AV_LOG_WARNING, "Parallel processing is not recommended for fixed-point precisions.\n");
ret = decompose_zp2biquads(ctx, inlink->channels);
if (ret < 0)
return ret;