[sdlsound] New Core Audio backend decoder

[Eric Wing]

Hi all,
I have implemented a new decoder for SDL_sound using Core Audio which
I would like to share with everybody. I hope Ryan will include it into
the main distribution.

My repo can be found at:
http://hg.assembla.com/SDL_sound_CoreAudio

The bulk of the new stuff is in coreaudio.c.

It works for both Mac OS X and iOS. Core Audio handles lots of
different file formats like aiff, aifc, wav, mp3, mp4, aac, sd2, au,
caf, 3gpp, 3gp2, ima, etc, so at least for Apple platforms we can
shrink the dependencies a bit. And on iOS, we also get an additional
potential benefit of hardware decoding for performance and battery
life.

I also have a quick and dirty Xcode project in the files section at:
http://www.assembla.com/spaces/SDL_sound_CoreAudio/documents

Thanks,
-Eric
-- 
Beginning iPhone Games Development
http://playcontrol.net/iphonegamebook/