[FFmpeg-devel] [PATCH 7/9] hevc: use intreadwrite

[Christophe Gisquet]

Hi,

2014-07-10 19:35 GMT+02:00 Michael Niedermayer <michaelni at gmx.at>:
> AV_COPY, AV_SWAP, AV_ZERO
> AV_[RW]N[8-64]A need aligned memory
>
> AV_[RW][BLN][8-64]
> AV_COPY*U doesnt need aligned memory, but might be faster if its
> aligned.
> These might be slower than the "aligned only" variants

Documentation sent in another patch

If I have to assume I need addresses aligned on 8 to use AV_ZERO64,
then unfortunately, forcing that alignment on the MvField struct bumps
its size from 11 to 16. Maybe it's worth it performance-wise, but I'm
not going to make us spend more time on this part.

So here's a patch where I align various things to 4 to allow using
AV_ZERO32/AV_RN32A.

-- 
Christophe
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