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