avfilter/avf_showcqt: optimize gamma calculation
benchmark (on intel core2 duo, gcc 4.9.1)
input samples duration 00:03:39.59
command: time -p ffmpeg -f f32le -ac 2 -ar 44100 -i input.pcm \
-filter_complex showcqt=fullhd=0:gamma=$gamma \
-f rawvideo -y /dev/null
gamma previous modified
1 48.49 s 45.38 s
2 49.33 s 48.11 s
3 80.86 s 59.80 s
4 80.84 s 51.25 s
5 80.75 s 61.06 s
6 80.93 s 61.80 s
7 80.03 s 61.56 s
Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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