It appears that Andrew Kieschnick has been busy with KallistiOS. He has released two examples one dealing with JPEG compression/decompression, the other a DivXcore.
The libjpeg6-b package contains a port of the standard JPEF image compression, with source code. Most users will know what JPEG is and what it is used for so a full explanation is a bit unnecessary.
The DivX package, libdivxdecore-0.47 is source and a simple test “movie player” which utilizes the popular DivX codec. AndrewK warns that it’s extremely slow, reaching 5 fps with no sound. So this is NOT the DivX movie player people have been asking for. He has included full source, and invites anyone to take a stab at speeding it up, though he doubts a big enough speed
increase is possible.