This avoids most of clippings for fixed-point precision inputs.
Also add warning about filtering fixed-point precision with parallel processing.
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]; \
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;