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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
from test import test_support
test_support.requires('audio')
from test.test_support import verbose, findfile, TestSkipped
import errno
import fcntl
import ossaudiodev
import os
import sys
import select
import sunaudio
import time
import audioop
import unittest
# 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:
raise RuntimeError("Expect .au file with 8-bit mu-law samples")
# Convert the data to 16-bit signed.
data = audioop.ulaw2lin(data, 2)
return (data, rate, 16, nchannels)
class OSSAudioDevTests(unittest.TestCase):
def play_sound_file(self, data, rate, ssize, nchannels):
try:
dsp = ossaudiodev.open('w')
except IOError as msg:
if msg.args[0] in (errno.EACCES, errno.ENOENT,
errno.ENODEV, errno.EBUSY):
raise TestSkipped(msg)
raise
# 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.
self.failUnless(dsp.close)
self.assertEqual(dsp.name, "/dev/dsp")
self.assertEqual(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)
except TypeError:
pass
else:
self.fail("dsp.%s not read-only" % attr)
# 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
self.failUnless(percent_diff <= 10.0,
"elapsed time (%s) > 10%% off of expected time (%s)" %
(elapsed_time, expected_time))
def set_parameters(self, 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)
self.assertEqual(result, (fmt, channels, rate),
"setparameters%r: returned %r" % (config, result))
result = dsp.setparameters(fmt, channels, rate, True)
self.assertEqual(result, (fmt, channels, rate),
"setparameters%r: returned %r" % (config, result))
def set_bad_parameters(self, 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)
self.failIfEqual(result, config,
"unexpectedly got requested configuration")
try:
result = dsp.setparameters(fmt, channels, rate, True)
except ossaudiodev.OSSAudioError as err:
pass
else:
self.fail("expected OSSAudioError")
def test_playback(self):
sound_info = read_sound_file(findfile('audiotest.au'))
self.play_sound_file(*sound_info)
def test_set_parameters(self):
dsp = ossaudiodev.open("w")
try:
self.set_parameters(dsp)
# Disabled because it fails under Linux 2.6 with ALSA's OSS
# emulation layer.
#self.set_bad_parameters(dsp)
finally:
dsp.close()
self.failUnless(dsp.closed)
def test_main():
try:
dsp = ossaudiodev.open('w')
except IOError as msg:
if msg.args[0] in (errno.EACCES, errno.ENOENT,
errno.ENODEV, errno.EBUSY):
raise TestSkipped(msg)
raise
dsp.close()
test_support.run_unittest(__name__)
if __name__ == "__main__":
test_main()
|
