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#!/usr/bin/env python3
# -*- mode: python; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-
## 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
from __future__ import print_function
import sys
import time
import getopt
import alsaaudio
def usage():
print('usage: playbacktest.py [-d <device>] <file>', file=sys.stderr)
sys.exit(2)
if __name__ == '__main__':
device = 'default'
opts, args = getopt.getopt(sys.argv[1:], 'd:')
for o, a in opts:
if o == '-d':
device = a
if not args:
usage()
f = open(args[0], 'rb')
# Open the device in playback mode in Mono, 44100 Hz, 16 bit little endian frames
# The period size controls the internal number of frames per period.
# The significance of this parameter is documented in the ALSA api.
out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, channels=1, rate=44100, format=alsaaudio.PCM_FORMAT_S16_LE, periodsize=160, device=device)
# Read data from stdin
data = f.read(320)
while data:
out.write(data)
data = f.read(320)
out.close()
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