/usr/share/doc/python-alsaaudio/examples/playbacktest.py is in python-alsaaudio 0.7-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | #!/usr/bin/env python
## playbacktest.py
##
## This is an example of a simple sound playback script.
##
## The script opens an ALSA pcm for sound playback. Set
## various attributes of the device. It then reads data
## from stdin and writes it to the device.
##
## To test it out do the following:
## python recordtest.py out.raw # talk to the microphone
## python playbacktest.py out.raw
# 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 time
import getopt
import alsaaudio
def usage():
sys.stderr.write('usage: playbacktest.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 = open(args[0], 'rb')
# Open the device in playback mode.
out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, card=card)
# Set attributes: Mono, 44100 Hz, 16 bit little endian frames
out.setchannels(1)
out.setrate(44100)
out.setformat(alsaaudio.PCM_FORMAT_S16_LE)
# The period size controls the internal number of frames per period.
# The significance of this parameter is documented in the ALSA api.
out.setperiodsize(160)
# Read data from stdin
data = f.read(320)
while data:
out.write(data)
data = f.read(320)
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