[FFmpeg-devel] [PATCH 0/9] hevc: misc cleanups

Christophe Gisquet christophe.gisquet at gmail.com
Fri Jul 11 08:31:20 CEST 2014


2014-07-10 8:47 GMT+02:00 Christophe Gisquet <christophe.gisquet at gmail.com>:
> The 4 first patches reduce memory allocations as, in a simplified view,
> only the previous ctb line is needed for the various prediction mechanisms.
> The actual required allocation is much smaller, but would require too many
> changes. And the margin of this mail is too small to explain it.
>   hevc: reduce allocation for split_cu_flag
>   hevc: reduce allocation for skip_flag
>   hevc: reduce allocation for tab_ipm
>   hevc: reduce cu depth allocation

The implementation of threading on slice/wavefront breaks with these
patches: multiple threads are actually accessing these buffers. Having
these buffers per thread may alleviate the issue, but that would
quickly reduce the patches benefit.

Anyway, they were more of a poking, so patches 1-4 dropped.

PS: not handled in those patches, but tab_mvf_pool / rpl_tab_pool size
might be divided by 16, see how x/y are rounded in
temporal_luma_motion_vector. YMMV, seeing how threading was
implemented for slices.


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