[FFmpeg-devel] avcodec/proresdec : add 12b decoding support

[Martin Vignali]

Hello,

Patchs in attach add 12b decoding for prores
Theses patch are based on patch by Kieran Kunhya
https://pastebin.com/mYNJkdMH

After theses patch by default Prores 422 are decode in 10b and 444 in 12b
I add a user option, to force 10b or 12b decoding

Need to be apply after patch "avutil - swscale : add YUVA444P12 and
YUVA422P12"

003 : cosmetic, remove unused value
004 : move dsp init after codec tag check (in order to set later decoding
precision based on codec_tag by default)
005/006 : rename dsp part for 10b
007/008/009 : reorganize unpack alpha and add 12b alpha decoding
010 : Add 12b idct for prores (keep the 10b version)
011 : In 12b, i have a segfault, for file with non multiple of 16 height.
Don't understand why doesn't appear in 10b mode. But like several func,
seems to write after the last visible line. I increase buffer height, and
set crop bottom.
012 : Add 12b support for 444 by default, and add user option for setting
decoding precision
013 : Add fate test for prores with 12b decoding precision

Comments welcome

Martin
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