Mercurial > cpython-lru_cache-weakref

annotate Mac/Lib/Audio_mac.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents a7c2737687c2
children d087cd060bad
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1 QSIZE = 100000
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2 error='Audio_mac.error'
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3
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4 class Play_Audio_mac:
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5
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6 def __init__(self, qsize=QSIZE):
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7 self._chan = None
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8 self._qsize = qsize
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9 self._outrate = 22254
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10 self._sampwidth = 1
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11 self._nchannels = 1
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12 self._gc = []
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13 self._usercallback = None
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14
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15 def __del__(self):
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16 self.stop()
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17 self._usercallback = None
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18
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19 def wait(self):
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20 import time
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21 while self.getfilled():
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22 time.sleep(0.1)
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23 self._chan = None
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24 self._gc = []
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25
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26 def stop(self, quietNow = 1):
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27 ##chan = self._chan
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28 self._chan = None
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29 ##chan.SndDisposeChannel(1)
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30 self._gc = []
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31
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32 def setoutrate(self, outrate):
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33 self._outrate = outrate
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34
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35 def setsampwidth(self, sampwidth):
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36 self._sampwidth = sampwidth
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37
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38 def setnchannels(self, nchannels):
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39 self._nchannels = nchannels
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40
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41 def writeframes(self, data):
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42 import time
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43 from Sound import *
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44 import struct
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45 if not self._chan:
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46 import Snd
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47 self._chan = Snd.SndNewChannel(5, 0, self._callback)
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48 nframes = len(data) / self._nchannels / self._sampwidth
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49 if len(data) != nframes * self._nchannels * self._sampwidth:
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50 raise error, 'data is not a whole number of frames'
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51 while self._gc and \
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52 self.getfilled() + nframes > \
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53 self._qsize / self._nchannels / self._sampwidth:
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54 time.sleep(0.1)
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55 if self._sampwidth == 1:
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56 import audioop
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57 data = audioop.add(data, '\x80'*len(data), 1)
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58 h1 = struct.pack('llhhllbbl',
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59 id(data)+12,
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60 self._nchannels,
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61 self._outrate, 0,
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62 0,
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63 0,
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64 extSH,
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65 60,
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66 nframes)
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67 h2 = 22*'\0'
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68 h3 = struct.pack('hhlll',
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69 self._sampwidth*8,
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70 0,
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71 0,
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72 0,
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73 0)
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74 header = h1+h2+h3
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75 self._gc.append((header, data))
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76 self._chan.SndDoCommand((bufferCmd, 0, header), 0)
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77 self._chan.SndDoCommand((callBackCmd, 0, 0), 0)
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78
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79 def _callback(self, *args):
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80 del self._gc[0]
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81 if self._usercallback:
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82 self._usercallback()
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83
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84 def setcallback(self, callback):
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85 self._usercallback = callback
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86
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87 def getfilled(self):
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88 filled = 0
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89 for header, data in self._gc:
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90 filled = filled + len(data)
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91 return filled / self._nchannels / self._sampwidth
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92
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93 def getfillable(self):
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94 return (self._qsize / self._nchannels / self._sampwidth) - self.getfilled()
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95
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96 def ulaw2lin(self, data):
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97 import audioop
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98 return audioop.ulaw2lin(data, 2)
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99
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100 def test():
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101 import aifc
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102 import macfs
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103 fss, ok = macfs.PromptGetFile("Select an AIFF soundfile", "AIFF")
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104 if not ok: return
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105 fn = fss.as_pathname()
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106 af = aifc.open(fn, 'r')
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107 print af.getparams()
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108 p = Play_Audio_mac()
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109 p.setoutrate(af.getframerate())
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110 p.setsampwidth(af.getsampwidth())
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111 p.setnchannels(af.getnchannels())
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112 BUFSIZ = 10000
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113 while 1:
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114 data = af.readframes(BUFSIZ)
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115 if not data: break
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116 p.writeframes(data)
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117 print 'wrote', len(data), 'space', p.getfillable()
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118 p.wait()
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119
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120 if __name__ == '__main__':
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121 test()