[x264-devel] Re: x264_t.dct.block.luma4x4 & residual_ac

[Måns Rullgård]

"GC Wen" <gcmoon at mimow.com> writes:

> Hi,
>
> I put x264_t->dct->block->residual_ac and
> x264_t->dct->block->luma4x4 into a UNION.
> and it seems works.
> maybe it can save a little memory?

It would save (16+8) * 16 * sizeof(int) = 1536 bytes, if your ints are
32 bits.  If you are that tight on memory you probably have more of a
problem holding the frame data in memory.

I'm not quite sure how these are used, but if only one of them will
ever be in use, making them a union could have the advantage of making
this more clear in the declaration.

-- 
Måns Rullgård
mru at inprovide.com

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