Dennis Ranke wrote:

> Hm, since this is a gba mailing list, i assume you are talking about
> the gameboy advance which shouldn't have much of a problem decoding
> jpegs. I have just written a decoder in arm asm which should decode a
> 240x160 jpeg to 15bit color in about 0.5-1 seconds on an 16mhz arm.
> This should already be good enough for some uses but i'm aware that
> it is possible to get the decoder to always take less than half a
> second. (the dct code uses currently the simplest implementation which
> takes up to 64 muls per pixel...)

Go for the AAN DCT.. Using that I'm currently at 0.31 MegaPixels per second
(about 8fps) using 8:1 compressed images. That's still in a complete C++
implementation with no assembler yet. I see maybe a marginal increase in the
DCT core, though the compiler has done a pretty cool job.
I expect with some hand tweaking to push this to maybe 10fps, and maybe then
eek some more speed through other optimisations.
AndyM