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Commit 05493021 authored by Michael Niedermayer's avatar Michael Niedermayer
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more idct_permute docs 

Originally committed as revision 1852 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 96a7e73b
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libavcodec/dsputil.h
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...@@ -240,6 +240,10 @@ typedef struct DSPContext { ...@@ -240,6 +240,10 @@ typedef struct DSPContext {
/** /**
* idct input permutation. * 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: * an example to avoid confusion:
* - (->decode coeffs -> zigzag reorder -> dequant -> reference idct ->...) * - (->decode coeffs -> zigzag reorder -> dequant -> reference idct ->...)
* - (x -> referece dct -> reference idct -> x) * - (x -> referece dct -> reference idct -> x)
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