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avfilter/vf_ssim: use log10 instead of log()/log(10)

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This is likely more precise and conveys the intent better.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This commit is contained in:
Ganesh Ajjanagadde 2015-10-29 00:17:19 -04:00
parent ec66bcc0e7
commit b8e1980807
1 changed files with 1 additions and 1 deletions
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libavfilter/vf_ssim.c
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@ -176,7 +176,7 @@ static float ssim_plane(SSIMDSPContext *dsp,
static double ssim_db(double ssim, double weight) static double ssim_db(double ssim, double weight)
{ {
return 10 * (log(weight) / log(10) - log(weight - ssim) / log(10)); return 10 * log10(weight / (weight - ssim));
} }
static AVFrame *do_ssim(AVFilterContext *ctx, AVFrame *main, static AVFrame *do_ssim(AVFilterContext *ctx, AVFrame *main,