original patch by Nguyen Kim <[email protected]>.
Note that volume changing never worked on my system with NAS, but
that seems to be a nasd problem which I did not try to track down yet...
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@8273 b3059339-0415-0410-9bf9-f77b7e298cf2