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avfilter/avf_showspectrum: use log10 instead of log()/...

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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 00:14:39 -04:00
parent 59d37f5a4e
commit ec66bcc0e7
1 changed files with 1 additions and 1 deletions
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libavfilter/avf_showspectrum.c
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@ -386,7 +386,7 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
a = cbrt(a);
break;
case LOG:
a = 1 - log(FFMAX(FFMIN(1, a), 1e-6)) / log(1e-6); // zero = -120dBFS
a = 1 + log10(FFMAX(FFMIN(1, a), 1e-6)) / 6; // zero = -120dBFS
break;
default:
av_assert0(0);