[FFmpeg-cvslog] ffmpeg: use log10 instead of log()/log(10)

[Ganesh Ajjanagadde]

ffmpeg | branch: master | Ganesh Ajjanagadde <gajjanagadde at gmail.com> | Thu Oct 29 00:01:43 2015 -0400| [b45daad2aa34d17e225e6449fd8cdaeba02ec2be] | committer: Ganesh Ajjanagadde

ffmpeg: use log10 instead of log()/log(10)

This is more concise and conveys the intent better.
Furthermore, it is likely more precise as well due to lack of floating
point division.

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b45daad2aa34d17e225e6449fd8cdaeba02ec2be
---

 ffmpeg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ffmpeg.c b/ffmpeg.c
index afe1cb7..f8b071a 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -1244,7 +1244,7 @@ static void do_video_out(AVFormatContext *s,
 
 static double psnr(double d)
 {
-    return -10.0 * log(d) / log(10.0);
+    return -10.0 * log10(d);
 }
 
 static void do_video_stats(OutputStream *ost, int frame_size)