[FFmpeg-devel] avfilter/vsrc_testsrc : add allgray generator and fate test for it

[Martin Vignali]

Hello,

Patch in attach add a video generator which output all gray value for the
given pix_fmt
Also add fate test for each target pix_fmt.

The goal is to have a generator for testing swscale unscaled conversion
later

The size of the output depend of the pix_fmt
gray8 output a 256x1 frame
gray9 le/be : output 256x2
gray10 le/be : output 256x4
gray12 le/be : output 256x16
gray14 le/be : output 256x64
gray16 le/be : output 256x256

Martin
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