forked from auracaster/pyalsaaudio
ae5c4aad9b
it's very primitive, but it shows adequately what can happen and what to do about it minimally (that is, complain and move on).
55 lines
1.5 KiB
Python
Executable File
55 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- mode: python; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-
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## playbacktest.py
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##
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## This is an example of a simple sound playback script.
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##
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## The script opens an ALSA pcm for sound playback. Set
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## various attributes of the device. It then reads data
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## from stdin and writes it to the device.
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##
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## To test it out do the following:
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## python recordtest.py out.raw # talk to the microphone
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## python playbacktest.py out.raw
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from __future__ import print_function
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import sys
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import time
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import getopt
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import alsaaudio
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def usage():
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print('usage: playbacktest.py [-d <device>] <file>', file=sys.stderr)
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sys.exit(2)
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if __name__ == '__main__':
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device = 'default'
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opts, args = getopt.getopt(sys.argv[1:], 'd:')
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for o, a in opts:
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if o == '-d':
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device = a
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if not args:
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usage()
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f = open(args[0], 'rb')
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# Open the device in playback mode in Mono, 44100 Hz, 16 bit little endian frames
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# The period size controls the internal number of frames per period.
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# The significance of this parameter is documented in the ALSA api.
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out = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, channels=1, rate=44100, format=alsaaudio.PCM_FORMAT_S16_LE, periodsize=160, device=device)
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# Read data from stdin
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data = f.read(320)
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while data:
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if out.write(data) < 0:
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print("Playback buffer underrun! Continuing nonetheless ...")
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data = f.read(320)
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out.close()
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