avfilter/vf_idet: use exp2()
authorMichael Niedermayer <michaelni@gmx.at>
Mon, 3 Nov 2014 16:22:33 +0000 (17:22 +0100)
committerMichael Niedermayer <michaelni@gmx.at>
Mon, 3 Nov 2014 16:22:33 +0000 (17:22 +0100)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
libavfilter/vf_idet.c

index a059565..40b2616 100644 (file)
@@ -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;