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#!/usr/bin/env python
# Simple test script that plays (some) wav files
# Footnote: I'd normally use print instead of sys.std(out|err).write,
# but we're in the middle of the conversion between python 2 and 3
# and this code runs on both versions without conversion
import sys
import wave
import getopt
import alsaaudio
def play(device, f):
sys.stdout.write('%d channels, %d sampling rate\n' % (f.getnchannels(),
f.getframerate()))
# Set attributes
device.setchannels(f.getnchannels())
device.setrate(f.getframerate())
# We 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')
data = f.readframes(320)
while data:
# Read data from stdin
device.write(data)
data = f.readframes(320)
def usage():
sys.stderr.write('usage: playwav.py [-c <card>] <file>\n')
sys.exit(2)
if __name__ == '__main__':
card = 'default'
opts, args = getopt.getopt(sys.argv[1:], 'c:')
for o, a in opts:
if o == '-c':
card = a
if not args:
usage()
f = wave.open(args[0], 'rb')
device = alsaaudio.PCM(card=card)
play(device, f)
f.close()
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