Logo Search packages:      
Sourcecode: blender version File versions  Download package

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
an example to avoid confusion:

  • (->decode coeffs -> zigzag reorder -> dequant -> reference idct ->...)
  • (x -> referece dct -> reference idct -> x)
  • (x -> referece dct -> simple_mmx_perm = idct_permutation -> simple_idct_mmx -> x)
  • (->decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant -> simple_idct_mmx ->...)

Definition at line 333 of file dsputil.h.

Referenced by mpeg4_pred_ac().


Generated by  Doxygen 1.6.0   Back to index