Mercurial > cpython-lru_cache-weakref

annotate Lib/sunau.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 6470566196b3
children 41ed98a93236 99d26f32aed3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Stuff to parse Sun and NeXT audio files.
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2
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3 An audio file consists of a header followed by the data. The structure
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4 of the header is as follows.
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5
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6 +---------------+
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7 | magic word |
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8 +---------------+
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9 | header size |
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10 +---------------+
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11 | data size |
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12 +---------------+
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13 | encoding |
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14 +---------------+
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15 | sample rate |
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16 +---------------+
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17 | # of channels |
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18 +---------------+
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19 | info |
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20 | |
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21 +---------------+
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22
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23 The magic word consists of the 4 characters '.snd'. Apart from the
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24 info field, all header fields are 4 bytes in size. They are all
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25 32-bit unsigned integers encoded in big-endian byte order.
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26
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27 The header size really gives the start of the data.
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28 The data size is the physical size of the data. From the other
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29 parameters the number of frames can be calculated.
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30 The encoding gives the way in which audio samples are encoded.
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31 Possible values are listed below.
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32 The info field currently consists of an ASCII string giving a
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33 human-readable description of the audio file. The info field is
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34 padded with NUL bytes to the header size.
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35
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36 Usage.
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37
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38 Reading audio files:
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39 f = sunau.open(file, 'r')
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40 where file is either the name of a file or an open file pointer.
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41 The open file pointer must have methods read(), seek(), and close().
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42 When the setpos() and rewind() methods are not used, the seek()
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43 method is not necessary.
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44
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45 This returns an instance of a class with the following public methods:
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46 getnchannels() -- returns number of audio channels (1 for
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47 mono, 2 for stereo)
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48 getsampwidth() -- returns sample width in bytes
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49 getframerate() -- returns sampling frequency
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50 getnframes() -- returns number of audio frames
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51 getcomptype() -- returns compression type ('NONE' or 'ULAW')
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52 getcompname() -- returns human-readable version of
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53 compression type ('not compressed' matches 'NONE')
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54 getparams() -- returns a tuple consisting of all of the
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55 above in the above order
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56 getmarkers() -- returns None (for compatibility with the
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57 aifc module)
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58 getmark(id) -- raises an error since the mark does not
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59 exist (for compatibility with the aifc module)
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60 readframes(n) -- returns at most n frames of audio
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61 rewind() -- rewind to the beginning of the audio stream
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62 setpos(pos) -- seek to the specified position
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63 tell() -- return the current position
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64 close() -- close the instance (make it unusable)
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65 The position returned by tell() and the position given to setpos()
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66 are compatible and have nothing to do with the actual position in the
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67 file.
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68 The close() method is called automatically when the class instance
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69 is destroyed.
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70
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71 Writing audio files:
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72 f = sunau.open(file, 'w')
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73 where file is either the name of a file or an open file pointer.
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74 The open file pointer must have methods write(), tell(), seek(), and
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75 close().
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76
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77 This returns an instance of a class with the following public methods:
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78 setnchannels(n) -- set the number of channels
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79 setsampwidth(n) -- set the sample width
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80 setframerate(n) -- set the frame rate
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81 setnframes(n) -- set the number of frames
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82 setcomptype(type, name)
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83 -- set the compression type and the
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84 human-readable compression type
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85 setparams(tuple)-- set all parameters at once
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86 tell() -- return current position in output file
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87 writeframesraw(data)
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88 -- write audio frames without pathing up the
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89 file header
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90 writeframes(data)
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91 -- write audio frames and patch up the file header
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92 close() -- patch up the file header and close the
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93 output file
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94 You should set the parameters before the first writeframesraw or
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95 writeframes. The total number of frames does not need to be set,
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96 but when it is set to the correct value, the header does not have to
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97 be patched up.
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98 It is best to first set all parameters, perhaps possibly the
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99 compression type, and then write audio frames using writeframesraw.
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100 When all frames have been written, either call writeframes('') or
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101 close() to patch up the sizes in the header.
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102 The close() method is called automatically when the class instance
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103 is destroyed.
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104 """
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105
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106 # from <multimedia/audio_filehdr.h>
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107 AUDIO_FILE_MAGIC = 0x2e736e64
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108 AUDIO_FILE_ENCODING_MULAW_8 = 1
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109 AUDIO_FILE_ENCODING_LINEAR_8 = 2
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110 AUDIO_FILE_ENCODING_LINEAR_16 = 3
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111 AUDIO_FILE_ENCODING_LINEAR_24 = 4
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112 AUDIO_FILE_ENCODING_LINEAR_32 = 5
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113 AUDIO_FILE_ENCODING_FLOAT = 6
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114 AUDIO_FILE_ENCODING_DOUBLE = 7
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115 AUDIO_FILE_ENCODING_ADPCM_G721 = 23
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116 AUDIO_FILE_ENCODING_ADPCM_G722 = 24
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117 AUDIO_FILE_ENCODING_ADPCM_G723_3 = 25
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118 AUDIO_FILE_ENCODING_ADPCM_G723_5 = 26
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119 AUDIO_FILE_ENCODING_ALAW_8 = 27
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120
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121 # from <multimedia/audio_hdr.h>
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122 AUDIO_UNKNOWN_SIZE = 0xFFFFFFFF # ((unsigned)(~0))
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123
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124 _simple_encodings = [AUDIO_FILE_ENCODING_MULAW_8,
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125 AUDIO_FILE_ENCODING_LINEAR_8,
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126 AUDIO_FILE_ENCODING_LINEAR_16,
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127 AUDIO_FILE_ENCODING_LINEAR_24,
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128 AUDIO_FILE_ENCODING_LINEAR_32,
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129 AUDIO_FILE_ENCODING_ALAW_8]
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130
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131 class Error(Exception):
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132 pass
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133
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parents:
diff changeset
134 def _read_u32(file):
40644
1c26505c1de6 Rip out 'long' and 'L'-suffixed integer literals.
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parents: 15872
diff changeset
135 x = 0
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136 for i in range(4):
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diff changeset
137 byte = file.read(1)
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parents: 44098
diff changeset
138 if not byte:
15872
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diff changeset
139 raise EOFError
3685ef2a55a4 Whitespace normalization.
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diff changeset
140 x = x*256 + ord(byte)
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diff changeset
141 return x
1419
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parents:
diff changeset
142
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
143 def _write_u32(file, x):
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
144 data = []
3685ef2a55a4 Whitespace normalization.
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145 for i in range(4):
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parents: 15067
diff changeset
146 d, m = divmod(x, 256)
48711
31c39a62d3f9 #3567: fix sunau for running with -bb and make test_ossaudiodev work.
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diff changeset
147 data.insert(0, int(m))
15872
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parents: 15067
diff changeset
148 x = d
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Antoine Pitrou <solipsis@pitrou.net>
parents: 44098
diff changeset
149 file.write(bytes(data))
1419
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parents:
diff changeset
150
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
151 class Au_read:
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parents: 1435
diff changeset
152
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diff changeset
153 def __init__(self, f):
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parents: 15067
diff changeset
154 if type(f) == type(''):
44098
0889daf6d0d9 #1535: rename __builtin__ module to builtins.
Georg Brandl <georg@python.org>
parents: 43020
diff changeset
155 import builtins
0889daf6d0d9 #1535: rename __builtin__ module to builtins.
Georg Brandl <georg@python.org>
parents: 43020
diff changeset
156 f = builtins.open(f, 'rb')
65844
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
Antoine Pitrou <solipsis@pitrou.net>
parents: 62157
diff changeset
157 self._opened = True
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
Antoine Pitrou <solipsis@pitrou.net>
parents: 62157
diff changeset
158 else:
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
Antoine Pitrou <solipsis@pitrou.net>
parents: 62157
diff changeset
159 self._opened = False
15872
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diff changeset
160 self.initfp(f)
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parents: 1435
diff changeset
161
15872
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diff changeset
162 def __del__(self):
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parents: 15067
diff changeset
163 if self._file:
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164 self.close()
1437
e499116d45e4 aifc.py, sunau.py: Adapted comments; added access statements.
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parents: 1435
diff changeset
165
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166 def initfp(self, file):
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167 self._file = file
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168 self._soundpos = 0
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parents: 15067
diff changeset
169 magic = int(_read_u32(file))
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parents: 15067
diff changeset
170 if magic != AUDIO_FILE_MAGIC:
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parents: 41717
diff changeset
171 raise Error('bad magic number')
15872
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diff changeset
172 self._hdr_size = int(_read_u32(file))
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
173 if self._hdr_size < 24:
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parents: 41717
diff changeset
174 raise Error('header size too small')
15872
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diff changeset
175 if self._hdr_size > 100:
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parents: 41717
diff changeset
176 raise Error('header size ridiculously large')
15872
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parents: 15067
diff changeset
177 self._data_size = _read_u32(file)
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
178 if self._data_size != AUDIO_UNKNOWN_SIZE:
3685ef2a55a4 Whitespace normalization.
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diff changeset
179 self._data_size = int(self._data_size)
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
180 self._encoding = int(_read_u32(file))
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
181 if self._encoding not in _simple_encodings:
43020
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parents: 41717
diff changeset
182 raise Error('encoding not (yet) supported')
15872
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diff changeset
183 if self._encoding in (AUDIO_FILE_ENCODING_MULAW_8,
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
184 AUDIO_FILE_ENCODING_ALAW_8):
3685ef2a55a4 Whitespace normalization.
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diff changeset
185 self._sampwidth = 2
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
186 self._framesize = 1
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
187 elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_8:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
188 self._framesize = self._sampwidth = 1
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
189 elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_16:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
190 self._framesize = self._sampwidth = 2
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
191 elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_24:
3685ef2a55a4 Whitespace normalization.
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diff changeset
192 self._framesize = self._sampwidth = 3
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
193 elif self._encoding == AUDIO_FILE_ENCODING_LINEAR_32:
3685ef2a55a4 Whitespace normalization.
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diff changeset
194 self._framesize = self._sampwidth = 4
3685ef2a55a4 Whitespace normalization.
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diff changeset
195 else:
43020
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parents: 41717
diff changeset
196 raise Error('unknown encoding')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
197 self._framerate = int(_read_u32(file))
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
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diff changeset
198 self._nchannels = int(_read_u32(file))
3685ef2a55a4 Whitespace normalization.
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diff changeset
199 self._framesize = self._framesize * self._nchannels
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
200 if self._hdr_size > 24:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
201 self._info = file.read(self._hdr_size - 24)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
202 for i in range(len(self._info)):
48711
31c39a62d3f9 #3567: fix sunau for running with -bb and make test_ossaudiodev work.
Antoine Pitrou <solipsis@pitrou.net>
parents: 44098
diff changeset
203 if self._info[i] == b'\0':
15872
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
204 self._info = self._info[:i]
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
205 break
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
206 else:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
207 self._info = ''
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
208
15872
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diff changeset
209 def getfp(self):
3685ef2a55a4 Whitespace normalization.
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diff changeset
210 return self._file
1419
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parents:
diff changeset
211
15872
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diff changeset
212 def getnchannels(self):
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diff changeset
213 return self._nchannels
1419
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parents:
diff changeset
214
15872
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diff changeset
215 def getsampwidth(self):
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parents: 15067
diff changeset
216 return self._sampwidth
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
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parents:
diff changeset
217
15872
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diff changeset
218 def getframerate(self):
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parents: 15067
diff changeset
219 return self._framerate
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
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parents:
diff changeset
220
15872
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diff changeset
221 def getnframes(self):
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
222 if self._data_size == AUDIO_UNKNOWN_SIZE:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
223 return AUDIO_UNKNOWN_SIZE
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
224 if self._encoding in _simple_encodings:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
225 return self._data_size / self._framesize
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
226 return 0 # XXX--must do some arithmetic here
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
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parents:
diff changeset
227
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
228 def getcomptype(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
229 if self._encoding == AUDIO_FILE_ENCODING_MULAW_8:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
230 return 'ULAW'
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
231 elif self._encoding == AUDIO_FILE_ENCODING_ALAW_8:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
232 return 'ALAW'
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
233 else:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
234 return 'NONE'
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
235
15872
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
236 def getcompname(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
237 if self._encoding == AUDIO_FILE_ENCODING_MULAW_8:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
238 return 'CCITT G.711 u-law'
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
239 elif self._encoding == AUDIO_FILE_ENCODING_ALAW_8:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
240 return 'CCITT G.711 A-law'
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
241 else:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
242 return 'not compressed'
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
243
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
244 def getparams(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
245 return self.getnchannels(), self.getsampwidth(), \
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
246 self.getframerate(), self.getnframes(), \
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
247 self.getcomptype(), self.getcompname()
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
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parents:
diff changeset
248
15872
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diff changeset
249 def getmarkers(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
250 return None
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
251
15872
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parents: 15067
diff changeset
252 def getmark(self, id):
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
253 raise Error('no marks')
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
254
15872
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
255 def readframes(self, nframes):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
256 if self._encoding in _simple_encodings:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
257 if nframes == AUDIO_UNKNOWN_SIZE:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
258 data = self._file.read()
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
259 else:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
260 data = self._file.read(nframes * self._framesize * self._nchannels)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
261 if self._encoding == AUDIO_FILE_ENCODING_MULAW_8:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
262 import audioop
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
263 data = audioop.ulaw2lin(data, self._sampwidth)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
264 return data
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
265 return None # XXX--not implemented yet
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
266
15872
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
267 def rewind(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
268 self._soundpos = 0
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
269 self._file.seek(self._hdr_size)
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
270
15872
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
271 def tell(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
272 return self._soundpos
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
273
15872
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
274 def setpos(self, pos):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
275 if pos < 0 or pos > self.getnframes():
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
276 raise Error('position not in range')
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
277 self._file.seek(pos * self._framesize + self._hdr_size)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
278 self._soundpos = pos
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
279
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
280 def close(self):
65844
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diff changeset
281 if self._opened and self._file:
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
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282 self._file.close()
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283 self._file = None
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284
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
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285 class Au_write:
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286
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diff changeset
287 def __init__(self, f):
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diff changeset
288 if type(f) == type(''):
44098
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diff changeset
289 import builtins
0889daf6d0d9 #1535: rename __builtin__ module to builtins.
Georg Brandl <georg@python.org>
parents: 43020
diff changeset
290 f = builtins.open(f, 'wb')
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diff changeset
291 self._opened = True
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
Antoine Pitrou <solipsis@pitrou.net>
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diff changeset
292 else:
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
Antoine Pitrou <solipsis@pitrou.net>
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diff changeset
293 self._opened = False
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294 self.initfp(f)
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295
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296 def __del__(self):
3685ef2a55a4 Whitespace normalization.
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diff changeset
297 if self._file:
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298 self.close()
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diff changeset
299 self._file = None
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diff changeset
300
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301 def initfp(self, file):
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302 self._file = file
3685ef2a55a4 Whitespace normalization.
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diff changeset
303 self._framerate = 0
3685ef2a55a4 Whitespace normalization.
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304 self._nchannels = 0
3685ef2a55a4 Whitespace normalization.
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305 self._sampwidth = 0
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306 self._framesize = 0
3685ef2a55a4 Whitespace normalization.
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307 self._nframes = AUDIO_UNKNOWN_SIZE
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308 self._nframeswritten = 0
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diff changeset
309 self._datawritten = 0
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diff changeset
310 self._datalength = 0
62157
1a1016fa0723 Issue #8897: Fix sunau module, use bytes to write the header. Patch written by
Victor Stinner <victor.stinner@haypocalc.com>
parents: 48711
diff changeset
311 self._info = b''
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312 self._comptype = 'ULAW' # default is U-law
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313
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314 def setnchannels(self, nchannels):
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diff changeset
315 if self._nframeswritten:
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diff changeset
316 raise Error('cannot change parameters after starting to write')
15872
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diff changeset
317 if nchannels not in (1, 2, 4):
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318 raise Error('only 1, 2, or 4 channels supported')
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319 self._nchannels = nchannels
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320
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diff changeset
321 def getnchannels(self):
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diff changeset
322 if not self._nchannels:
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parents: 41717
diff changeset
323 raise Error('number of channels not set')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
324 return self._nchannels
1419
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parents:
diff changeset
325
15872
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diff changeset
326 def setsampwidth(self, sampwidth):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
327 if self._nframeswritten:
43020
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diff changeset
328 raise Error('cannot change parameters after starting to write')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
329 if sampwidth not in (1, 2, 4):
43020
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parents: 41717
diff changeset
330 raise Error('bad sample width')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
331 self._sampwidth = sampwidth
1419
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parents:
diff changeset
332
15872
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diff changeset
333 def getsampwidth(self):
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
334 if not self._framerate:
43020
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parents: 41717
diff changeset
335 raise Error('sample width not specified')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
336 return self._sampwidth
1419
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parents:
diff changeset
337
15872
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diff changeset
338 def setframerate(self, framerate):
3685ef2a55a4 Whitespace normalization.
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parents: 15067
diff changeset
339 if self._nframeswritten:
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diff changeset
340 raise Error('cannot change parameters after starting to write')
15872
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diff changeset
341 self._framerate = framerate
1419
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342
15872
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diff changeset
343 def getframerate(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
344 if not self._framerate:
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diff changeset
345 raise Error('frame rate not set')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
346 return self._framerate
1419
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347
15872
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diff changeset
348 def setnframes(self, nframes):
3685ef2a55a4 Whitespace normalization.
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diff changeset
349 if self._nframeswritten:
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diff changeset
350 raise Error('cannot change parameters after starting to write')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
351 if nframes < 0:
43020
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parents: 41717
diff changeset
352 raise Error('# of frames cannot be negative')
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
353 self._nframes = nframes
1419
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parents:
diff changeset
354
15872
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diff changeset
355 def getnframes(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
356 return self._nframeswritten
1419
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Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
357
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
358 def setcomptype(self, type, name):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
359 if type in ('NONE', 'ULAW'):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
360 self._comptype = type
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
361 else:
43020
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parents: 41717
diff changeset
362 raise Error('unknown compression type')
1419
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Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
363
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
364 def getcomptype(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
365 return self._comptype
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
366
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
367 def getcompname(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
368 if self._comptype == 'ULAW':
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
369 return 'CCITT G.711 u-law'
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
370 elif self._comptype == 'ALAW':
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
371 return 'CCITT G.711 A-law'
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
372 else:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
373 return 'not compressed'
1419
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Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
374
41717
9ad84070b22d Merged revisions 55328-55341 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 40644
diff changeset
375 def setparams(self, params):
9ad84070b22d Merged revisions 55328-55341 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 40644
diff changeset
376 nchannels, sampwidth, framerate, nframes, comptype, compname = params
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
377 self.setnchannels(nchannels)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
378 self.setsampwidth(sampwidth)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
379 self.setframerate(framerate)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
380 self.setnframes(nframes)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
381 self.setcomptype(comptype, compname)
1419
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parents:
diff changeset
382
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
383 def getparams(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
384 return self.getnchannels(), self.getsampwidth(), \
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
385 self.getframerate(), self.getnframes(), \
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
386 self.getcomptype(), self.getcompname()
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
387
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
388 def tell(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
389 return self._nframeswritten
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
390
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
391 def writeframesraw(self, data):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
392 self._ensure_header_written()
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
393 nframes = len(data) / self._framesize
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
394 if self._comptype == 'ULAW':
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
395 import audioop
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
396 data = audioop.lin2ulaw(data, self._sampwidth)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
397 self._file.write(data)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
398 self._nframeswritten = self._nframeswritten + nframes
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
399 self._datawritten = self._datawritten + len(data)
1419
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parents:
diff changeset
400
15872
3685ef2a55a4 Whitespace normalization.
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diff changeset
401 def writeframes(self, data):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
402 self.writeframesraw(data)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
403 if self._nframeswritten != self._nframes or \
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
404 self._datalength != self._datawritten:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
405 self._patchheader()
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
406
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
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diff changeset
407 def close(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
408 self._ensure_header_written()
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
409 if self._nframeswritten != self._nframes or \
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
410 self._datalength != self._datawritten:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
411 self._patchheader()
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
412 self._file.flush()
65844
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
Antoine Pitrou <solipsis@pitrou.net>
parents: 62157
diff changeset
413 if self._opened and self._file:
6470566196b3 Issue #10265: Close file objects explicitly in sunau. Patch by Brian Brazil.
Antoine Pitrou <solipsis@pitrou.net>
parents: 62157
diff changeset
414 self._file.close()
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
415 self._file = None
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
416
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
417 #
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
418 # private methods
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
419 #
1437
e499116d45e4 aifc.py, sunau.py: Adapted comments; added access statements.
Sjoerd Mullender <sjoerd@acm.org>
parents: 1435
diff changeset
420
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
421 def _ensure_header_written(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
422 if not self._nframeswritten:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
423 if not self._nchannels:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
424 raise Error('# of channels not specified')
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
425 if not self._sampwidth:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
426 raise Error('sample width not specified')
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
427 if not self._framerate:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
428 raise Error('frame rate not specified')
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
429 self._write_header()
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
430
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
431 def _write_header(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
432 if self._comptype == 'NONE':
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
433 if self._sampwidth == 1:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
434 encoding = AUDIO_FILE_ENCODING_LINEAR_8
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
435 self._framesize = 1
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
436 elif self._sampwidth == 2:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
437 encoding = AUDIO_FILE_ENCODING_LINEAR_16
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
438 self._framesize = 2
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
439 elif self._sampwidth == 4:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
440 encoding = AUDIO_FILE_ENCODING_LINEAR_32
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
441 self._framesize = 4
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
442 else:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
443 raise Error('internal error')
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
444 elif self._comptype == 'ULAW':
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
445 encoding = AUDIO_FILE_ENCODING_MULAW_8
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
446 self._framesize = 1
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
447 else:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
448 raise Error('internal error')
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
449 self._framesize = self._framesize * self._nchannels
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
450 _write_u32(self._file, AUDIO_FILE_MAGIC)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
451 header_size = 25 + len(self._info)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
452 header_size = (header_size + 7) & ~7
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
453 _write_u32(self._file, header_size)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
454 if self._nframes == AUDIO_UNKNOWN_SIZE:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
455 length = AUDIO_UNKNOWN_SIZE
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
456 else:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
457 length = self._nframes * self._framesize
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
458 _write_u32(self._file, length)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
459 self._datalength = length
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
460 _write_u32(self._file, encoding)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
461 _write_u32(self._file, self._framerate)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
462 _write_u32(self._file, self._nchannels)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
463 self._file.write(self._info)
48711
31c39a62d3f9 #3567: fix sunau for running with -bb and make test_ossaudiodev work.
Antoine Pitrou <solipsis@pitrou.net>
parents: 44098
diff changeset
464 self._file.write(b'\0'*(header_size - len(self._info) - 24))
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
465
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
466 def _patchheader(self):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
467 self._file.seek(8)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
468 _write_u32(self._file, self._datawritten)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
469 self._datalength = self._datawritten
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
470 self._file.seek(0, 2)
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
471
11034
b6a438cc195b Make the mode parameter to open() default in the same way as for wave.open().
Fred Drake <fdrake@acm.org>
parents: 10103
diff changeset
472 def open(f, mode=None):
15872
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
473 if mode is None:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
474 if hasattr(f, 'mode'):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
475 mode = f.mode
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
476 else:
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
477 mode = 'rb'
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
478 if mode in ('r', 'rb'):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
479 return Au_read(f)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
480 elif mode in ('w', 'wb'):
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
481 return Au_write(f)
3685ef2a55a4 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 15067
diff changeset
482 else:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41717
diff changeset
483 raise Error("mode must be 'r', 'rb', 'w', or 'wb'")
1419
204001dddcc3 aifc.py: added missing tell() method in AIFC write class;
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
484
1435
560ec7030817 * Mass change: get rid of all init() methods, in favor of __init__()
Guido van Rossum <guido@python.org>
parents: 1424
diff changeset
485 openfp = open