| 1 | """Convert "arbitrary" sound files to AIFF (Apple and SGI's audio format).
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| 2 |
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| 3 | Input may be compressed.
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| 4 | Uncompressed file type may be AIFF, WAV, VOC, 8SVX, NeXT/Sun, and others.
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| 5 | An exception is raised if the file is not of a recognized type.
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| 6 | Returned filename is either the input filename or a temporary filename;
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| 7 | in the latter case the caller must ensure that it is removed.
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| 8 | Other temporary files used are removed by the function.
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| 9 | """
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| 10 |
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| 11 | import os
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| 12 | import tempfile
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| 13 | import pipes
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| 14 | import sndhdr
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| 15 |
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| 16 | __all__ = ["error", "toaiff"]
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| 17 |
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| 18 | table = {}
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| 19 |
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| 20 | t = pipes.Template()
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| 21 | t.append('sox -t au - -t aiff -r 8000 -', '--')
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| 22 | table['au'] = t
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| 23 |
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| 24 | # XXX The following is actually sub-optimal.
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| 25 | # XXX The HCOM sampling rate can be 22k, 22k/2, 22k/3 or 22k/4.
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| 26 | # XXX We must force the output sampling rate else the SGI won't play
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| 27 | # XXX files sampled at 5.5k or 7.333k; however this means that files
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| 28 | # XXX sampled at 11k are unnecessarily expanded.
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| 29 | # XXX Similar comments apply to some other file types.
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| 30 | t = pipes.Template()
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| 31 | t.append('sox -t hcom - -t aiff -r 22050 -', '--')
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| 32 | table['hcom'] = t
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| 33 |
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| 34 | t = pipes.Template()
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| 35 | t.append('sox -t voc - -t aiff -r 11025 -', '--')
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| 36 | table['voc'] = t
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| 37 |
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| 38 | t = pipes.Template()
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| 39 | t.append('sox -t wav - -t aiff -', '--')
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| 40 | table['wav'] = t
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| 41 |
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| 42 | t = pipes.Template()
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| 43 | t.append('sox -t 8svx - -t aiff -r 16000 -', '--')
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| 44 | table['8svx'] = t
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| 45 |
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| 46 | t = pipes.Template()
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| 47 | t.append('sox -t sndt - -t aiff -r 16000 -', '--')
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| 48 | table['sndt'] = t
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| 49 |
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| 50 | t = pipes.Template()
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| 51 | t.append('sox -t sndr - -t aiff -r 16000 -', '--')
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| 52 | table['sndr'] = t
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| 53 |
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| 54 | uncompress = pipes.Template()
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| 55 | uncompress.append('uncompress', '--')
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| 56 |
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| 57 |
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| 58 | class error(Exception):
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| 59 | pass
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| 60 |
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| 61 | def toaiff(filename):
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| 62 | temps = []
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| 63 | ret = None
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| 64 | try:
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| 65 | ret = _toaiff(filename, temps)
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| 66 | finally:
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| 67 | for temp in temps[:]:
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| 68 | if temp != ret:
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| 69 | try:
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| 70 | os.unlink(temp)
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| 71 | except os.error:
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| 72 | pass
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| 73 | temps.remove(temp)
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| 74 | return ret
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| 75 |
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| 76 | def _toaiff(filename, temps):
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| 77 | if filename[-2:] == '.Z':
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| 78 | (fd, fname) = tempfile.mkstemp()
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| 79 | os.close(fd)
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| 80 | temps.append(fname)
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| 81 | sts = uncompress.copy(filename, fname)
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| 82 | if sts:
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| 83 | raise error, filename + ': uncompress failed'
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| 84 | else:
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| 85 | fname = filename
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| 86 | try:
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| 87 | ftype = sndhdr.whathdr(fname)
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| 88 | if ftype:
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| 89 | ftype = ftype[0] # All we're interested in
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| 90 | except IOError, msg:
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| 91 | if type(msg) == type(()) and len(msg) == 2 and \
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| 92 | type(msg[0]) == type(0) and type(msg[1]) == type(''):
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| 93 | msg = msg[1]
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| 94 | if type(msg) != type(''):
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| 95 | msg = repr(msg)
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| 96 | raise error, filename + ': ' + msg
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| 97 | if ftype == 'aiff':
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| 98 | return fname
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| 99 | if ftype is None or not ftype in table:
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| 100 | raise error, '%s: unsupported audio file type %r' % (filename, ftype)
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| 101 | (fd, temp) = tempfile.mkstemp()
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| 102 | os.close(fd)
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| 103 | temps.append(temp)
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| 104 | sts = table[ftype].copy(fname, temp)
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| 105 | if sts:
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| 106 | raise error, filename + ': conversion to aiff failed'
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| 107 | return temp
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