Lib/test/test_linuxaudiodev.py

   1 from test import test_support
   2 test_support.requires('audio')
   3
   4 from test.test_support import verbose, findfile, TestFailed, TestSkipped
   5
   6 import errno
   7 import fcntl
   8 import linuxaudiodev
   9 import os
  10 import sys
  11 import select
  12 import sunaudio
  13 import time
  14 import audioop
  15
  16 SND_FORMAT_MULAW_8 = 1
  17
  18 def play_sound_file(path):
  19     fp = open(path, 'r')
  20     size, enc, rate, nchannels, extra = sunaudio.gethdr(fp)
  21     data = fp.read()
  22     fp.close()
  23
  24     if enc != SND_FORMAT_MULAW_8:
  25         print "Expect .au file with 8-bit mu-law samples"
  26         return
  27
  28     try:
  29         a = linuxaudiodev.open('w')
  30     except linuxaudiodev.error, msg:
  31         if msg[0] in (errno.EACCES, errno.ENOENT, errno.ENODEV, errno.EBUSY):
  32             raise TestSkipped, msg
  33         raise TestFailed, msg
  34
  35     # convert the data to 16-bit signed
  36     data = audioop.ulaw2lin(data, 2)
  37
  38     # set the data format
  39     if sys.byteorder == 'little':
  40         fmt = linuxaudiodev.AFMT_S16_LE
  41     else:
  42         fmt = linuxaudiodev.AFMT_S16_BE
  43
  44     # at least check that these methods can be invoked
  45     a.bufsize()
  46     a.obufcount()
  47     a.obuffree()
  48     a.getptr()
  49     a.fileno()
  50
  51     # set parameters based on .au file headers
  52     a.setparameters(rate, 16, nchannels, fmt)
  53     a.write(data)
  54     a.flush()
  55     a.close()
  56
  57 def test_errors():
  58     a = linuxaudiodev.open("w")
  59     size = 8
  60     fmt = linuxaudiodev.AFMT_U8
  61     rate = 8000
  62     nchannels = 1
  63     try:
  64         a.setparameters(-1, size, nchannels, fmt)
  65     except ValueError, msg:
  66         print msg
  67     try:
  68         a.setparameters(rate, -2, nchannels, fmt)
  69     except ValueError, msg:
  70         print msg
  71     try:
  72         a.setparameters(rate, size, 3, fmt)
  73     except ValueError, msg:
  74         print msg
  75     try:
  76         a.setparameters(rate, size, nchannels, 177)
  77     except ValueError, msg:
  78         print msg
  79     try:
  80         a.setparameters(rate, size, nchannels, linuxaudiodev.AFMT_U16_LE)
  81     except ValueError, msg:
  82         print msg
  83     try:
  84         a.setparameters(rate, 16, nchannels, fmt)
  85     except ValueError, msg:
  86         print msg
  87
  88 def test():
  89     play_sound_file(findfile('audiotest.au'))
  90     test_errors()
  91
  92 test()