playwav.py

import sys
import wave
import getopt
import alsaaudio

def playwav(wavfilename):
    card = 'default'

    device = alsaaudio.PCM()
    f = wave.open(wavfilename, 'rb')

    print('%d channels, %d sampling rate\n' % (f.getnchannels(),
                                               f.getframerate()))
    # Set attributes
    device.setchannels(f.getnchannels())
    device.setrate(f.getframerate())

    # 8bit is unsigned in wav files
    if f.getsampwidth() == 1:
        device.setformat(alsaaudio.PCM_FORMAT_U8)
    # Otherwise we assume signed data, little endian
    elif f.getsampwidth() == 2:
        device.setformat(alsaaudio.PCM_FORMAT_S16_LE)
    elif f.getsampwidth() == 3:
        device.setformat(alsaaudio.PCM_FORMAT_S24_LE)
    elif f.getsampwidth() == 4:
        device.setformat(alsaaudio.PCM_FORMAT_S32_LE)
    else:
        raise ValueError('Unsupported format')

    device.setperiodsize(320)

    data = f.readframes(320)
    while data:
        # Read data from stdin
        device.write(data)
        data = f.readframes(320)

    f.close()