[FFmpeg-devel] [PATCH] diracdec: rewrite golomb reader

[Lynne]

This version is able to output multiple coefficients at a time and
is able to altogether remove actual golomb code parsing.
Its also able to partially recover the last coefficient in case
the packet is incomplete.

Total decoder performance gain for 8bit 420 1080p lossless: 40%.
Total decoder performance gain for 10bit 420 1080p lossless: 40%.

clang and gcc were both able to vectorize the loop much better than
my handwritten assembly, though it can be improved.

Lookup table is a rewritten version of vc2hqdecode.

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