source: trunk/essentials/dev-lang/python/Lib/test/test_ossaudiodev.py@ 3317

from test import test_support
test_support.requires('audio')

from test.test_support import verbose, findfile, TestFailed, TestSkipped

import errno
import fcntl
import ossaudiodev
import os
import sys
import select
import sunaudio
import time
import audioop

# Arggh, AFMT_S16_NE not defined on all platforms -- seems to be a
# fairly recent addition to OSS.
try:
    from ossaudiodev import AFMT_S16_NE
except ImportError:
    if sys.byteorder == "little":
        AFMT_S16_NE = ossaudiodev.AFMT_S16_LE
    else:
        AFMT_S16_NE = ossaudiodev.AFMT_S16_BE


SND_FORMAT_MULAW_8 = 1

def read_sound_file(path):
    fp = open(path, 'rb')
    size, enc, rate, nchannels, extra = sunaudio.gethdr(fp)
    data = fp.read()
    fp.close()

    if enc != SND_FORMAT_MULAW_8:
        print "Expect .au file with 8-bit mu-law samples"
        return

    # Convert the data to 16-bit signed.
    data = audioop.ulaw2lin(data, 2)
    return (data, rate, 16, nchannels)

# version of assert that still works with -O
def _assert(expr, message=None):
    if not expr:
        raise AssertionError(message or "assertion failed")

def play_sound_file(data, rate, ssize, nchannels):
    try:
        dsp = ossaudiodev.open('w')
    except IOError, msg:
        if msg[0] in (errno.EACCES, errno.ENOENT, errno.ENODEV, errno.EBUSY):
            raise TestSkipped, msg
        raise TestFailed, msg

    # at least check that these methods can be invoked
    dsp.bufsize()
    dsp.obufcount()
    dsp.obuffree()
    dsp.getptr()
    dsp.fileno()

    # Make sure the read-only attributes work.
    _assert(dsp.closed is False, "dsp.closed is not False")