mirror of
https://github.com/larsimmisch/pyalsaaudio.git
synced 2026-04-16 16:15:31 +00:00
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).
65 lines
1.5 KiB
Python
Executable File
65 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
# -*- mode: python; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*-
|
|
|
|
# Simple test script that plays (some) wav files
|
|
|
|
from __future__ import print_function
|
|
|
|
import sys
|
|
import wave
|
|
import getopt
|
|
import alsaaudio
|
|
|
|
def play(device, f):
|
|
|
|
format = None
|
|
|
|
# 8bit is unsigned in wav files
|
|
if f.getsampwidth() == 1:
|
|
format = alsaaudio.PCM_FORMAT_U8
|
|
# Otherwise we assume signed data, little endian
|
|
elif f.getsampwidth() == 2:
|
|
format = alsaaudio.PCM_FORMAT_S16_LE
|
|
elif f.getsampwidth() == 3:
|
|
format = alsaaudio.PCM_FORMAT_S24_3LE
|
|
elif f.getsampwidth() == 4:
|
|
format = alsaaudio.PCM_FORMAT_S32_LE
|
|
else:
|
|
raise ValueError('Unsupported format')
|
|
|
|
periodsize = f.getframerate() // 8
|
|
|
|
print('%d channels, %d sampling rate, format %d, periodsize %d\n' % (f.getnchannels(),
|
|
f.getframerate(),
|
|
format,
|
|
periodsize))
|
|
|
|
device = alsaaudio.PCM(channels=f.getnchannels(), rate=f.getframerate(), format=format, periodsize=periodsize, device=device)
|
|
|
|
data = f.readframes(periodsize)
|
|
while data:
|
|
# Read data from stdin
|
|
if device.write(data) < 0:
|
|
print("Playback buffer underrun! Continuing nonetheless ...")
|
|
data = f.readframes(periodsize)
|
|
|
|
|
|
def usage():
|
|
print('usage: playwav.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()
|
|
|
|
with wave.open(args[0], 'rb') as f:
|
|
play(device, f)
|