[MPlayer-dev-eng] explanations needed ot libmpeg2 idct.c algorithm

[Michael Niedermayer]

Hi

On Sat, Sep 02, 2006 at 01:18:17PM +0200, mirak wrote:
> hi,
> 
> I am trying to implement the idct_row and idct_col in coldfire assembly 
> using MAC instructions.
> The algorithm used in idct.c seems different than a theoric idct.
> I use octave/matlab to test the algorithm and don't get an expected result.
> The algorithm used uses a lot of factorisation, and even when 
> developping the equations, I don't get the expected equation.
> 
> I understand the shifts used, why the coef are multiplied by sqrt(2) ans 
> also tha matrix multiplication behind this, but the block values doesn't 
> seems to be the right ones.

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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In the past you could go to a library and read, borrow or copy any book
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