[MPlayer-dev-eng] [PATCH] AC3/DTS passthough support for MacOSX Intel

[? ?]

Add support for AC3/DTS passthrough to S/PDIF output on macosx according 
codes from auhal.c in VLC's sources.

also add support to restore digital output when re-plug s/pdif.

tested on macbook intel osx 10.4.10, not tested on power pc based mac (I 
think it need adapt ac_hwac3.c also for byte order fix)

Note: Before use passthrough, you'd better reboot your mac system once with 
s/pdif pluged to avoid strange audio not alive problem (after reboot it 
works fine)