1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
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 as 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")
_assert(dsp.name == "/dev/dsp")
_assert(dsp.mode == 'w', "bad dsp.mode: %r" % dsp.mode)
# And make sure they're really read-only.
for attr in ('closed', 'name', 'mode'):
try:
setattr(dsp, attr, 42)
raise RuntimeError("dsp.%s not read-only" % attr)
except TypeError:
pass
# Compute expected running time of sound sample (in seconds).
expected_time = float(len(data)) / (ssize/8) / nchannels / rate
# set parameters based on .au file headers
dsp.setparameters(AFMT_S16_NE, nchannels, rate)
print(("playing test sound file (expected running time: %.2f sec)"
% expected_time))
t1 = time.time()
dsp.write(data)
dsp.close()
t2 = time.time()
elapsed_time = t2 - t1
percent_diff = (abs(elapsed_time - expected_time) / expected_time) * 100
_assert(percent_diff <= 10.0, \
("elapsed time (%.2f sec) > 10%% off of expected time (%.2f sec)"
% (elapsed_time, expected_time)))
def test_setparameters(dsp):
# Two configurations for testing:
# config1 (8-bit, mono, 8 kHz) should work on even the most
# ancient and crufty sound card, but maybe not on special-
# purpose high-end hardware
# config2 (16-bit, stereo, 44.1kHz) should work on all but the
# most ancient and crufty hardware
config1 = (ossaudiodev.AFMT_U8, 1, 8000)
config2 = (AFMT_S16_NE, 2, 44100)
for config in [config1, config2]:
(fmt, channels, rate) = config
if (dsp.setfmt(fmt) == fmt and
dsp.channels(channels) == channels and
dsp.speed(rate) == rate):
break
else:
raise RuntimeError("unable to set audio sampling parameters: "
"you must have really weird audio hardware")
# setparameters() should be able to set this configuration in
# either strict or non-strict mode.
result = dsp.setparameters(fmt, channels, rate, False)
_assert(result == (fmt, channels, rate),
"setparameters%r: returned %r" % (config, result))
result = dsp.setparameters(fmt, channels, rate, True)
_assert(result == (fmt, channels, rate),
"setparameters%r: returned %r" % (config, result))
def test_bad_setparameters(dsp):
# Now try some configurations that are presumably bogus: eg. 300
# channels currently exceeds even Hollywood's ambitions, and
# negative sampling rate is utter nonsense. setparameters() should
# accept these in non-strict mode, returning something other than
# was requested, but should barf in strict mode.
fmt = AFMT_S16_NE
rate = 44100
channels = 2
for config in [(fmt, 300, rate), # ridiculous nchannels
(fmt, -5, rate), # impossible nchannels
(fmt, channels, -50), # impossible rate
]:
(fmt, channels, rate) = config
result = dsp.setparameters(fmt, channels, rate, False)
_assert(result != config,
"setparameters: unexpectedly got requested configuration")
try:
result = dsp.setparameters(fmt, channels, rate, True)
raise AssertionError("setparameters: expected OSSAudioError")
except ossaudiodev.OSSAudioError as err:
print("setparameters: got OSSAudioError as expected")
def test():
(data, rate, ssize, nchannels) = read_sound_file(findfile('audiotest.au'))
play_sound_file(data, rate, ssize, nchannels)
dsp = ossaudiodev.open("w")
try:
test_setparameters(dsp)
# Disabled because it fails under Linux 2.6 with ALSA's OSS
# emulation layer.
#test_bad_setparameters(dsp)
finally:
dsp.close()
_assert(dsp.closed is True, "dsp.closed is not True")
test()
|
