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more idct_permute docs
Originally committed as revision 1852 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -240,6 +240,10 @@ typedef struct DSPContext {
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/**
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* idct input permutation.
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* several optimized IDCTs need a permutated input (relative to the normal order of the reference
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* IDCT)
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* this permutation must be performed before the idct_put/add, note, normally this can be merged
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* with the zigzag/alternate scan<br>
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* an example to avoid confusion:
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* - (->decode coeffs -> zigzag reorder -> dequant -> reference idct ->...)
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* - (x -> referece dct -> reference idct -> x)
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