avfilter/vf_idet: use exp2()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

avfilter/vf_idet: use exp2()
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
898635ad · Michael Niedermayer · 4bbd8f05 · 898635ad
Commit 898635ad authored Nov 03, 2014 by Michael Niedermayer
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vf_idet.c libavfilter/vf_idet.c +1 -1

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--- a/libavfilter/vf_idet.c
+++ b/libavfilter/vf_idet.c
@@ -324,7 +324,7 @@ static av_cold int init(AVFilterContext *ctx)
    memset(idet->history, UNDETERMINED, HIST_SIZE);

    if( idet->half_life > 0 )
-        idet->decay_coefficient = (uint64_t) round( PRECISION * pow(2.0,-1.0 / idet->half_life) );
+        idet->decay_coefficient = (uint64_t) round( PRECISION * exp2(-1.0 / idet->half_life) );
    else
        idet->decay_coefficient = PRECISION;