[FFmpeg-devel] [PATCH] Fix VP3 dequantization matrices when an IDCT permutation is used

Michael Niedermayer michaelni
Wed Sep 17 12:53:15 CEST 2008

On Wed, Sep 17, 2008 at 01:07:47AM -0400, David Conrad wrote:
> Hi,
> It appears that the reason why the VP3 SSE/MMX IDCTs weren't bitexact to 
> the C version was because the dct coefficients weren't being dequantized 
> correctly when a permutation was needed. The coefficients are permutated 
> correctly in unpack_vlcs() but the dequantization matrices are built 
> assuming no permutation. This fix allows both the SSE2 and MMX IDCTs 
> produce bitexact output for the VP3 and Theora samples I have.

patches look ok

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I have often repented speaking, but never of holding my tongue.
-- Xenocrates
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