forked from auracaster/pyalsaaudio
54 lines
1.4 KiB
Python
Executable File
54 lines
1.4 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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out.write(data)
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data = f.read(320)
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