[FFmpeg-soc] [RFC] Apply function to pixel filter: vf_applyfn

[zeger at customsoft.nl]

Hi,

A lot of image operations like gamma adjustment, color inversion or
contrast enhancement can be expressed as a simple function applied 
to each pixel. I have written a YUV(A) only filter to apply these
functions.

For example: color inversion becomes applyfn=255-Y:255-U:255-V.
If the pow function would be available a gamma correction would 
look like this: applyfn=255*pow(Y/255\,0.25):U:V

Zeger Knops
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