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more idct_permute docs

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Originally committed as revision 1852 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-05-11 10:19:05 +00:00
parent 96a7e73b24
commit 0549302188
1 changed files with 4 additions and 0 deletions
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4
libavcodec/dsputil.h
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@ -240,6 +240,10 @@ typedef struct DSPContext {
/**
* idct input permutation.
* several optimized IDCTs need a permutated input (relative to the normal order of the reference
* IDCT)
* this permutation must be performed before the idct_put/add, note, normally this can be merged
* with the zigzag/alternate scan<br>
* an example to avoid confusion:
* - (->decode coeffs -> zigzag reorder -> dequant -> reference idct ->...)
* - (x -> referece dct -> reference idct -> x)