avfilter/vf_psnr: use log10 instead of log()/log(10)
authorGanesh Ajjanagadde <gajjanagadde@gmail.com>
Thu, 29 Oct 2015 04:16:34 +0000 (00:16 -0400)
committerGanesh Ajjanagadde <gajjanagadde@gmail.com>
Thu, 29 Oct 2015 22:53:11 +0000 (18:53 -0400)
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>
libavfilter/vf_psnr.c

index 36bbab2..bce5c51 100644 (file)
@@ -72,7 +72,7 @@ static inline unsigned pow2(unsigned base)
 
 static inline double get_psnr(double mse, uint64_t nb_frames, int max)
 {
-    return 10.0 * log(pow2(max) / (mse / nb_frames)) / log(10.0);
+    return 10.0 * log10(pow2(max) / (mse / nb_frames));
 }
 
 static uint64_t sse_line_8bit(const uint8_t *main_line,  const uint8_t *ref_line, int outw)