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8152d32375
Use != instead of <> since <> is documented as "obsolescent". Use "is" and "is not" when comparing with None or type objects.
104 lines
2.6 KiB
Python
104 lines
2.6 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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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:
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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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