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from test import test_support
test_support.requires('audio')
from test.test_support import findfile, TestSkipped, run_unittest
import errno
import sys
import audioop
import unittest
linuxaudiodev = test_support.import_module('linuxaudiodev', deprecated=True)
sunaudio = test_support.import_module('sunaudio', deprecated=True)
SND_FORMAT_MULAW_8 = 1
class LinuxAudioDevTests(unittest.TestCase):
def setUp(self):
self.dev = linuxaudiodev.open('w')
def tearDown(self):
self.dev.close()
def test_methods(self):
# at least check that these methods can be invoked
self.dev.bufsize()
self.dev.obufcount()
self.dev.obuffree()
self.dev.getptr()
self.dev.fileno()
def test_play_sound_file(self):
path = findfile("audiotest.au")
fp = open(path, 'r')
size, enc, rate, nchannels, extra = sunaudio.gethdr(fp)
data = fp.read()
fp.close()
if enc != SND_FORMAT_MULAW_8:
self.fail("Expect .au file with 8-bit mu-law samples")
# convert the data to 16-bit signed
data = audioop.ulaw2lin(data, 2)
# set the data format
if sys.byteorder == 'little':
fmt = linuxaudiodev.AFMT_S16_LE
else:
fmt = linuxaudiodev.AFMT_S16_BE
# set parameters based on .au file headers
self.dev.setparameters(rate, 16, nchannels, fmt)
self.dev.write(data)
self.dev.flush()
def test_errors(self):
size = 8
fmt = linuxaudiodev.AFMT_U8
rate = 8000
nchannels = 1
try:
self.dev.setparameters(-1, size, nchannels, fmt)
except ValueError, err:
self.assertEquals(err.args[0], "expected rate >= 0, not -1")
try:
self.dev.setparameters(rate, -2, nchannels, fmt)
except ValueError, err:
self.assertEquals(err.args[0], "expected sample size >= 0, not -2")
try:
self.dev.setparameters(rate, size, 3, fmt)
except ValueError, err:
self.assertEquals(err.args[0], "nchannels must be 1 or 2, not 3")
try:
self.dev.setparameters(rate, size, nchannels, 177)
except ValueError, err:
self.assertEquals(err.args[0], "unknown audio encoding: 177")
try:
self.dev.setparameters(rate, size, nchannels, linuxaudiodev.AFMT_U16_LE)
except ValueError, err:
self.assertEquals(err.args[0], "for linear unsigned 16-bit little-endian "
"audio, expected sample size 16, not 8")
try:
self.dev.setparameters(rate, 16, nchannels, fmt)
except ValueError, err:
self.assertEquals(err.args[0], "for linear unsigned 8-bit audio, expected "
"sample size 8, not 16")
def test_main():
try:
dsp = linuxaudiodev.open('w')
except linuxaudiodev.error, msg:
if msg.args[0] in (errno.EACCES, errno.ENOENT, errno.ENODEV, errno.EBUSY):
raise TestSkipped(msg)
raise
dsp.close()
run_unittest(LinuxAudioDevTests)
if __name__ == '__main__':
test_main()
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