* things we dont implement yet	* more verbose error reporting	* export MC information (for XvMC or for error resilience)	* export quantizer information (for postprocessing filters)	* dont crash on bad streams, make sure we can resync after a while		* possible chunk buffer overflow while reading bits	* synchronization stuff (play at correct speed)	* IDCT precision with sparse matrixes	* sparc IDCT optimizations	* support for still pictures (decode before receiving next startcode !)* structural optimizations	* do yuv per sub-slice (probably big speed boost)	* try different memory arrangements for pictures (yuyv, stride, ...)	* once we have sync, call draw_frame before decoding I or P not after* local optimizations	* put most common fields at start of decoder_t structure	* fix code that uses multiples of the stride (use preshifted value ?)	* avoid 8-bit accesses particularly on alpha	* use 64-bit shift register for parsing on 64-bit arches	* use restrict (__restrict__) pointers: int * restrict p;	* try feig IDCT ?	* review the use of static inline functions	* improve MMX motion comp inner routines	* optimize IDCT for very sparse input matrixes ?	* optimize startcode search loop ?	* bit parsing / DCT parsing optimizations* clean up	* clean up header file usage	* clean up yuv2rgb for interlaced pictures (handling of uv)	* clean up decoder_t structure (some variables should be local ?)	* clean up slice_init