[MPlayer-dev-eng] [PATCH] making coreaudio ao remember the volume in a playlist

[Stefano Pigozzi]

This patch makes the coreaudio audio output remember the volume when
changing audio unit. This is particularly handy when playing a playlist, or
using ordered chapters unofficial patches: without the patch the coreaudio
ao will change the volume to 1/4 of the maximum (thats the coreaudio ao
default) each time a new file in the playlist starts.

The volume is saved in a static variable before the audio unit
uninitialization and restored just after the initialization of a new one.

This is my first patch on mplayer so, please, bear with me if did not
respect some conventions, just let me know and I will fix the problems.
Moreover, I'm not really sure if this solution is really the most elegant
(probably not).
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