Funny instrument (MacBook only)

#!/usr/bin/env python

import array
import math
import time
from threading import Thread

import pyaudio
import applesms



class Sine:

    def __init__(self, hz, amplitude=1, rate=44100):
        self.hz = hz
        self.rate = rate
        self.amp = amplitude

    def value(self, frame):
        return self.amp * math.sin(math.pi * 2 * self.hz * frame / self.rate)



class Audio(Thread):

    def __init__(self):
        Thread.__init__(self)

        self.rate = 44100
        self.sounds = []
        self.stopped = False
        self.samples = 100
        self.frame = 0
        self.volume = 1.0
        self.tempo = 120

        self.p = pyaudio.PyAudio()
        self.stream = self.p.open(rate=self.rate,
                channels=1, format=pyaudio.paFloat32, output=True)

    def run(self):
        while not self.stopped:
            try:
                self.stream.write(array.array('f',
                        (self._amp() for _ in range(self.samples))).tostring())
            except IOError:
                break

    def _amp(self): # amplitude
        self.frame += 1
        return sum([i.value(self.frame) for i in self.sounds]) * self.volume

    def add(self, instrument):
        self.sounds.append(instrument)

    def remove(self, index):
        del self.sounds[index]

    def stop(self):
        self.stopped = True
        self.stream.close()
        self.p.terminate()



if __name__ == '__main__':
    a = Audio()
    sine = Sine(300)
    a.add(sine)
    a.start()

    try:
        while True:
            (x, y, z) = applesms.coords()
            sine.hz = 300 + z
            time.sleep(0.05)

    finally:
        a.stop()