quantum, as the callback wants us to provide exactly the amount of
samples needed.
This is incomplete because core audio may ask for less than the full
buffer size (for me, typically 1484 or 1488 bytes of a 2048 byte
buffer). As a quick hack until I read the rather impenetrable core
audio documentation, assume that each callback request will want
about the same number of samples as the preceeding one.
This makes sound bearable.
Also various cleanup.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5543 8ced0084-cf51-0410-be5f-012b33b47a6e
7f50bb5579