DMA stuff

After having a looong read through the MFC documentation, i finally came up with something what looks like double buffered huffman stream.

The good thing, all that dma stuff doesn't compromised decompression speed.
So far 1024x768 image takes <15 msec to decompress.
This is 3 times faster than scalar prototype on my Athlon.

Not very bad for poor little SPE ;)

SIMD rulez!

After iDCT + colorspace conversion has been done in SIMD way, i've got nice 13x speedup ;)
Now the test image decoding is 1.4ms vs. 18.5ms in scalar version.
Still, input double buffering and code cleanup must be done.