from math import sin


class AudioProducer(object):
    offset = 0
    def callback(self):
        offset = self.offset
        self.offset += 512
        return [
            0.5 * sin(3.1415*440.0/44100.0*(frame+offset))
            for frame in xrange(512)
        ]


import thread
import coreaudio
import time

## Have to initialize the threading mechanisms in order for PyGIL_Ensure to work
thread.start_new_thread(lambda: None, ())

ap = AudioProducer()
coreaudio.installAudioCallback(ap)
time.sleep(5)
coreaudio.stopAudio(ap)