DVD subpicture decoder

Based on reverse engineering performed by:
	Samuel Hocevar <sam@via.ecp.fr>
	Michel Lespinasse <walken@via.ecp.fr>

Maintained by:
	Thomas Mirlacher <dent@cosy.sbg.ac.at>

This code contains a working DVD subpicture implementation. It
needs almost a complete re-write to make it suitable to use
in dvd_play however.


How do I use these tools ?

	1. ./extract_subpic 0 < foo.vob > subpic_stream_0.raw
		The argument is the subtitle stream ID, it seems to go from 0 to 15.
	2. ./subpic_decode subpic_stream_0.raw

or, when using in conjunction with oms

	1. create a pipe `mkfifo /tmp/spu`
	2. run oms, and select the subpicture you want to have (See oms FAQ)


What doesn't work

	subpic_decode will only work with a 32 bpp visual. 

Some sample subpicture streams
	sample_dune.raw
	sample_leon.raw
	sample_bladerunner.raw
	aliens_stream_0.raw
	aliens_stream_1.raw
