[vlc-devel] [PATCH 1/1] picture: increase alignment for AVX2 on x86 to 32 byte

Janne Grunau janne-vlc at jannau.net
Sun Nov 27 17:07:47 CET 2016

On 2016-11-27 17:54:09 +0200, Rémi Denis-Courmont wrote:
> Le dimanche 27 novembre 2016, 16:29:15 Janne Grunau a écrit :
> > Required for direct rendering with AVX2 enabled libavcodec and AVX2
> > optimizations for the blend deinterlacer.
> The value in picture_Setup() does not actually apply in most scenarii, only 
> when the picture is allocated from the heap.

I need to make sure that that all pictures are aligned properly.

> libavcodec already has the opportunity to align picture buffer sizes 
> correctly through avcodec_align_dimensions2(), which works a lot 
> better in practice.

At least the change for the memalign is required. The aligned pitch to 
libavcodec's requirements doesn't help at all if the base bointer is 
only aligned to 16-bytes to begin with.


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