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avfilter/vf_dctdnoiz: Check threads 

Fixes: floating point division by 0
Fixes: Ticket 8269

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 4a3917c02c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-06-05 20:00:38 +02:00
parent 879ac3418e
commit f747fd6d6f
1 changed files with 3 additions and 0 deletions
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libavfilter/vf_dctdnoiz.c
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@ -563,6 +563,9 @@ static int config_input(AVFilterLink *inlink)
inlink->h - s->pr_height);
max_slice_h = s->pr_height / ((s->bsize - 1) * 2);
if (max_slice_h == 0)
return AVERROR(EINVAL);
s->nb_threads = FFMIN3(MAX_THREADS, ff_filter_get_nb_threads(ctx), max_slice_h);
av_log(ctx, AV_LOG_DEBUG, "threads: [max=%d hmax=%d user=%d] => %d\n",
MAX_THREADS, max_slice_h, ff_filter_get_nb_threads(ctx), s->nb_threads);