forked from auracaster/pyalsaaudio
40a1219dac
SND_PCM_FORMAT_S24_LE and similar are for 24bit ints packed in 4-bytes each. There is a similar family of formats for 3-bytes packed data (as stored in 24bit wave files). This commit: - adds S24_3LE, S24_3BE, U24_3LE, U24_3BE PCM formats to the alsaaudio.c - updates documentation - updates playwav.py to correctly play typical 24Bit PCM wave files Closes #38
66 lines
1.5 KiB
Python
Executable File
66 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python
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# Simple test script that plays (some) wav files
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from __future__ import print_function
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import sys
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import wave
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import getopt
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import alsaaudio
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def play(device, f):
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print('%d channels, %d sampling rate\n' % (f.getnchannels(),
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f.getframerate()))
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# Set attributes
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device.setchannels(f.getnchannels())
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device.setrate(f.getframerate())
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# 8bit is unsigned in wav files
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if f.getsampwidth() == 1:
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device.setformat(alsaaudio.PCM_FORMAT_U8)
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# Otherwise we assume signed data, little endian
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elif f.getsampwidth() == 2:
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device.setformat(alsaaudio.PCM_FORMAT_S16_LE)
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elif f.getsampwidth() == 3:
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device.setformat(alsaaudio.PCM_FORMAT_S24_3LE)
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elif f.getsampwidth() == 4:
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device.setformat(alsaaudio.PCM_FORMAT_S32_LE)
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else:
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raise ValueError('Unsupported format')
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periodsize = f.getframerate() / 8
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device.setperiodsize(periodsize)
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data = f.readframes(periodsize)
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while data:
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# Read data from stdin
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device.write(data)
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data = f.readframes(periodsize)
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def usage():
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print('usage: playwav.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 = wave.open(args[0], 'rb')
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device = alsaaudio.PCM(device=device)
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play(device, f)
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f.close()
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