Make the outside interface of audio output handling similar to the
video output one. An AO object is first created, and then methods
called with ao_[methodname](ao, args...). However internally libao2/
still holds all data in globals, and trying to create multiple
simultaneous AO instances won't work.
pause by checking mpctx directly. If there's any video update before the pause
then capture the frame or fallback to use last captured frame as pausing frame.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25054 b3059339-0415-0410-9bf9-f77b7e298cf2
