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107 lines
2.9 KiB
Python
107 lines
2.9 KiB
Python
"""Convert "arbitrary" sound files to AIFF (Apple and SGI's audio format).
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Input may be compressed.
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Uncompressed file type may be AIFF, WAV, VOC, 8SVX, NeXT/Sun, and others.
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An exception is raised if the file is not of a recognized type.
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Returned filename is either the input filename or a temporary filename;
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in the latter case the caller must ensure that it is removed.
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Other temporary files used are removed by the function.
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"""
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import os
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import tempfile
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import pipes
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import sndhdr
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__all__ = ["error", "toaiff"]
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table = {}
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t = pipes.Template()
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t.append('sox -t au - -t aiff -r 8000 -', '--')
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table['au'] = t
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# XXX The following is actually sub-optimal.
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# XXX The HCOM sampling rate can be 22k, 22k/2, 22k/3 or 22k/4.
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# XXX We must force the output sampling rate else the SGI won't play
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# XXX files sampled at 5.5k or 7.333k; however this means that files
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# XXX sampled at 11k are unnecessarily expanded.
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# XXX Similar comments apply to some other file types.
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t = pipes.Template()
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t.append('sox -t hcom - -t aiff -r 22050 -', '--')
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table['hcom'] = t
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t = pipes.Template()
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t.append('sox -t voc - -t aiff -r 11025 -', '--')
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table['voc'] = t
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t = pipes.Template()
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t.append('sox -t wav - -t aiff -', '--')
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table['wav'] = t
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t = pipes.Template()
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t.append('sox -t 8svx - -t aiff -r 16000 -', '--')
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table['8svx'] = t
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t = pipes.Template()
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t.append('sox -t sndt - -t aiff -r 16000 -', '--')
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table['sndt'] = t
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t = pipes.Template()
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t.append('sox -t sndr - -t aiff -r 16000 -', '--')
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table['sndr'] = t
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uncompress = pipes.Template()
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uncompress.append('uncompress', '--')
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class error(Exception):
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pass
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def toaiff(filename):
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temps = []
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ret = None
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try:
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ret = _toaiff(filename, temps)
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finally:
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for temp in temps[:]:
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if temp != ret:
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try:
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os.unlink(temp)
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except os.error:
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pass
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temps.remove(temp)
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return ret
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def _toaiff(filename, temps):
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if filename[-2:] == '.Z':
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fname = tempfile.mktemp()
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temps.append(fname)
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sts = uncompress.copy(filename, fname)
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if sts:
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raise error, filename + ': uncompress failed'
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else:
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fname = filename
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try:
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ftype = sndhdr.whathdr(fname)
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if ftype:
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ftype = ftype[0] # All we're interested in
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except IOError, msg:
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if type(msg) == type(()) and len(msg) == 2 and \
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type(msg[0]) == type(0) and type(msg[1]) == type(''):
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msg = msg[1]
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if type(msg) != type(''):
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msg = `msg`
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raise error, filename + ': ' + msg
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if ftype == 'aiff':
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return fname
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if ftype is None or not table.has_key(ftype):
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raise error, \
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filename + ': unsupported audio file type ' + `ftype`
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temp = tempfile.mktemp()
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temps.append(temp)
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sts = table[ftype].copy(fname, temp)
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if sts:
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raise error, filename + ': conversion to aiff failed'
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return temp
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