[x264-devel] Re: x264_mc_function_t in PPC

[Loren Merritt]

On Wed, 23 Feb 2005, Mauricio Alvarez wrote:

> I am working on a performance analysis of the H.264 coding for HD video on 
> the PowerPC architecture (Mac-OSX on a G5). I am using the x264 video encoder 
> because is faster than JM reference code and also because it has good altivec 
> optimizations.
>
> But with the repository modifications of the last week I can not compile the 
> code (with gcc-3.3.3) in my machine because a problem related with type 
> definitions of some pointer to functions.
>
> in common/ppc/mc.h is declared:
> void x264_mc_altivec_init( x264_mc_function_t pf[2] );
>
> But the type x264_mc_function_t is not declared anywhere and also the 
> declaration of MC_LUMA  and MC_CHROMA are missing.
>
> I can compile the code introducing the definition of x264_mc_function_t and 
> MC_LUMA  and MC_CHROMA from a previous version of the code, But I dont know 
> if these declarations were removed or changed for some specific reason.

When Radek optimized MC by caching half-pel planes, that changed the 
function signitures and usage. Neither he nor I have a PPC to test on, so 
we couldn't update those to match.
It should be reasonably simple to adapt mc_luma_mmx, get_ref_mmx, 
x264_mc_mmxext_init, and get_funcs_mmx.

--Loren Merritt

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