play audio on OSX?

I'm attempting to play an mp3 file on OSX, but am running into some difficulty. When using py-mad and py-ao, I only get static with the following code (which is derived off another mailing that I found from this list's archives):

#!/usr/bin/env python

'''Requires:
py-mad (mp3 ability)
py-ao (system audio ability)
'''
import mad, ao, sys
mf = mad.MadFile(sys.argv[1])
dev = ao.AudioDevice('macosx')#osx device, linux: use "oss" or "alsa"
while 1:
    buf = mf.read()
    if buf is None:
        break
    dev.play(buf, len(buf))

Does anyone know why this produces static, or whether there's a better method of producing audio output that's also cross-platform (OSX, linux)? I've looked at pymedia, but they do not support OSX at the moment.

Thanks!
.