contribution by Laszlo Torok <torokl@alpha.dfmk.hu>
4CC 'MAC3' and 'MAC6' in Quicktime.
It works for mono streams, needs to be fixed for stereo when I get my hands on a stereo sample :)
patch by (François Revol <revol at free dot fr>)


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1145 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b