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avfilter: avoid testing float == 0

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This fixes the hypothetical case of rounding errors causing
incorrect values to be used.
We do not use *_EPSILON, because non trivial expressions can contain
errors larger than that making a zero equality test with *_EPSILON
unreliable.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-09 16:41:56 +02:00
parent 60abdb6c17
commit 3dfc5f551f
1 changed files with 1 additions and 1 deletions
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2
libavfilter/avfilter.c
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@ -1062,7 +1062,7 @@ static int ff_filter_frame_framed(AVFilterLink *link, AVFrame *frame)
dstctx->var_values[VAR_T] = pts == AV_NOPTS_VALUE ? NAN : pts * av_q2d(link->time_base);
dstctx->var_values[VAR_POS] = pos == -1 ? NAN : pos;
dstctx->is_disabled = !av_expr_eval(dstctx->enable, dstctx->var_values, NULL);
dstctx->is_disabled = fabs(av_expr_eval(dstctx->enable, dstctx->var_values, NULL)) < 0.5;
if (dstctx->is_disabled &&
(dstctx->filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC))
filter_frame = default_filter_frame;