avfilter/vf_idet: use exp2()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
10 years ago · 898635ad9e
parent 4bbd8f05f7
commit 898635ad9e
1 changed files with 1 additions and 1 deletions
--- 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;