yuv2rgb_altivec_init_tables does initialize the SwsContext vectors.
missing vec_splat.
patch by (Luca Barbato <lu_zero at gentoo dot org>) and (Romain Dolbeau <dolbeau at irisa dot fr>)
Originally committed as revision 13565 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc
orginal patch by (Marc Hoffman <mmh at pleasantst dot com>)
critical fixes by (Reza Jelveh <reza.jelveh at tu-harburg dot de>)
known bugs/issues, which should be fixed ASAP by someone who has a ppc:
0..255 vs. 16..235
unneeded recalculation of tables
general cleaup, like removing double initalizing of variables
Originally committed as revision 12699 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc
