Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_ossaudiodev.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents f4c5e3a64be2
children 6768b2350c57
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
27896
4e31e4086849 - The audio driver tests (test_ossaudiodev.py and
Guido van Rossum <guido@python.org>
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diff changeset
1 from test import test_support
4e31e4086849 - The audio driver tests (test_ossaudiodev.py and
Guido van Rossum <guido@python.org>
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2 test_support.requires('audio')
4e31e4086849 - The audio driver tests (test_ossaudiodev.py and
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3
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4 from test.test_support import findfile
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5
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R. David Murray <rdmurray@bitdance.com>
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6 ossaudiodev = test_support.import_module('ossaudiodev')
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7
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8 import errno
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9 import sys
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10 import sunau
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11 import time
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12 import audioop
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13 import unittest
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14
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15 # Arggh, AFMT_S16_NE not defined on all platforms -- seems to be a
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16 # fairly recent addition to OSS.
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17 try:
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18 from ossaudiodev import AFMT_S16_NE
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19 except ImportError:
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20 if sys.byteorder == "little":
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21 AFMT_S16_NE = ossaudiodev.AFMT_S16_LE
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22 else:
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23 AFMT_S16_NE = ossaudiodev.AFMT_S16_BE
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24
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25
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26 def read_sound_file(path):
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27 with open(path, 'rb') as fp:
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28 au = sunau.open(fp)
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29 rate = au.getframerate()
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30 nchannels = au.getnchannels()
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31 encoding = au._encoding
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32 fp.seek(0)
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33 data = fp.read()
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34
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35 if encoding != sunau.AUDIO_FILE_ENCODING_MULAW_8:
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36 raise RuntimeError("Expect .au file with 8-bit mu-law samples")
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37
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38 # Convert the data to 16-bit signed.
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39 data = audioop.ulaw2lin(data, 2)
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40 return (data, rate, 16, nchannels)
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41
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42 class OSSAudioDevTests(unittest.TestCase):
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43
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44 def play_sound_file(self, data, rate, ssize, nchannels):
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45 try:
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46 dsp = ossaudiodev.open('w')
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47 except IOError, msg:
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48 if msg[0] in (errno.EACCES, errno.ENOENT, errno.ENODEV, errno.EBUSY):
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49 raise unittest.SkipTest(msg)
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50 raise
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51
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52 # at least check that these methods can be invoked
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53 dsp.bufsize()
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54 dsp.obufcount()
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55 dsp.obuffree()
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56 dsp.getptr()
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57 dsp.fileno()
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58
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59 # Make sure the read-only attributes work.
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60 self.failIf(dsp.closed)
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61 self.assertEqual(dsp.name, "/dev/dsp")
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62 self.assertEqual(dsp.mode, "w", "bad dsp.mode: %r" % dsp.mode)
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63
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64 # And make sure they're really read-only.
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65 for attr in ('closed', 'name', 'mode'):
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66 try:
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67 setattr(dsp, attr, 42)
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68 except TypeError:
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69 pass
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70 else:
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71 self.fail("dsp.%s not read-only" % attr)
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72
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73 # Compute expected running time of sound sample (in seconds).
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74 expected_time = float(len(data)) / (ssize/8) / nchannels / rate
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75
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76 # set parameters based on .au file headers
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77 dsp.setparameters(AFMT_S16_NE, nchannels, rate)
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78 self.assertTrue(abs(expected_time - 2.94) < 1e-2, expected_time)
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79 t1 = time.time()
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80 dsp.write(data)
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81 dsp.close()
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82 t2 = time.time()
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83 elapsed_time = t2 - t1
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84
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85 percent_diff = (abs(elapsed_time - expected_time) / expected_time) * 100
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86 self.failUnless(percent_diff <= 10.0,
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87 "elapsed time > 10% off of expected time")
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88
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89 def set_parameters(self, dsp):
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90 # Two configurations for testing:
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91 # config1 (8-bit, mono, 8 kHz) should work on even the most
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92 # ancient and crufty sound card, but maybe not on special-
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93 # purpose high-end hardware
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94 # config2 (16-bit, stereo, 44.1kHz) should work on all but the
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95 # most ancient and crufty hardware
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96 config1 = (ossaudiodev.AFMT_U8, 1, 8000)
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97 config2 = (AFMT_S16_NE, 2, 44100)
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98
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99 for config in [config1, config2]:
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100 (fmt, channels, rate) = config
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101 if (dsp.setfmt(fmt) == fmt and
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102 dsp.channels(channels) == channels and
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103 dsp.speed(rate) == rate):
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104 break
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105 else:
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106 raise RuntimeError("unable to set audio sampling parameters: "
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107 "you must have really weird audio hardware")
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108
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109 # setparameters() should be able to set this configuration in
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110 # either strict or non-strict mode.
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111 result = dsp.setparameters(fmt, channels, rate, False)
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112 self.assertEqual(result, (fmt, channels, rate),
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113 "setparameters%r: returned %r" % (config, result))
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114
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115 result = dsp.setparameters(fmt, channels, rate, True)
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116 self.assertEqual(result, (fmt, channels, rate),
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117 "setparameters%r: returned %r" % (config, result))
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118
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119 def set_bad_parameters(self, dsp):
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120 # Now try some configurations that are presumably bogus: eg. 300
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121 # channels currently exceeds even Hollywood's ambitions, and
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122 # negative sampling rate is utter nonsense. setparameters() should
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123 # accept these in non-strict mode, returning something other than
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124 # was requested, but should barf in strict mode.
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125 fmt = AFMT_S16_NE
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126 rate = 44100
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127 channels = 2
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128 for config in [(fmt, 300, rate), # ridiculous nchannels
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129 (fmt, -5, rate), # impossible nchannels
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130 (fmt, channels, -50), # impossible rate
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131 ]:
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132 (fmt, channels, rate) = config
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133 result = dsp.setparameters(fmt, channels, rate, False)
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134 self.failIfEqual(result, config,
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135 "unexpectedly got requested configuration")
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136
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137 try:
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138 result = dsp.setparameters(fmt, channels, rate, True)
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139 except ossaudiodev.OSSAudioError, err:
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140 pass
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141 else:
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142 self.fail("expected OSSAudioError")
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143
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144 def test_playback(self):
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145 sound_info = read_sound_file(findfile('audiotest.au'))
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146 self.play_sound_file(*sound_info)
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147
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148 def test_set_parameters(self):
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149 dsp = ossaudiodev.open("w")
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150 try:
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151 self.set_parameters(dsp)
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152
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153 # Disabled because it fails under Linux 2.6 with ALSA's OSS
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154 # emulation layer.
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155 #self.set_bad_parameters(dsp)
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156 finally:
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157 dsp.close()
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158 self.failUnless(dsp.closed)
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159
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160
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161 def test_main():
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162 try:
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163 dsp = ossaudiodev.open('w')
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164 except (ossaudiodev.error, IOError), msg:
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165 if msg[0] in (errno.EACCES, errno.ENOENT, errno.ENODEV, errno.EBUSY):
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166 raise unittest.SkipTest(msg)
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167 raise
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168 dsp.close()
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169 test_support.run_unittest(__name__)
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170
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171 if __name__ == "__main__":
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172 test_main()