[FFmpeg-devel] IDCT permutation (was: pre discussion around Blackfin dct_quantize_bfin routine)

[Ivan Kalvachev]

2007/6/13, Siarhei Siamashka <siarhei.siamashka at gmail.com>:
> > > On Blackfin you want to elliminate those permutations they are costly.
> > >  Basically, something like:
> > >
> > >     j=scantable[i];
> > >     x=data[j];

Actually you can combine both lookups. however in that case you'd have
to reorder the quantizer matrix accordingly.
However when I tried this approach in mpeg2 decoder the results
weren't amazing. (Athlon TBird).