make some noise

noise.py

#!/usr/bin/python
# (works on both 2.x and 3.x)

import math
import struct
import sys

import ossaudiodev as oss

SAMPLE_RATE = 48000
CHANNELS = 1

def sine(pos):
    return (math.sin(2 * math.pi * pos / SAMPLE_RATE))

def main():
    a = 0
    n = 0
    freq = 55

    dsp = oss.open('w')
    dsp.setparameters(oss.AFMT_S16_NE, CHANNELS, SAMPLE_RATE, True)

    if sys.stdout.isatty():
        print('Press Ctrl-C to stop.')
        cond = lambda: True
    else:
        cond = lambda: a < SAMPLE_RATE * 10

    try:
        while cond():
            data = sine(a * sine(n)) * sine(n / 3.0)
            dsp.write(struct.pack('h', int(32767 * data)))
            a += 1
            n += freq
    except KeyboardInterrupt:
        pass

    dsp.close()

if __name__ == '__main__': main()