"""Convert "arbitrary" sound files to AIFF (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 osimport tempfileimport pipesimport sndhdr __all__ = ["error", "toaiff"] 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', '--')  class error(Exception):    pass 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':        (fd, fname) = tempfile.mkstemp()        os.close(fd)        temps.append(fname)        sts = uncompress.copy(filename, fname)        if sts:            raise error, filename + ': uncompress failed'    else:        fname = filename    try:        ftype = sndhdr.whathdr(fname)        if ftype:            ftype = ftype[0] # All we're interested in    except IOError, msg:        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 = repr(msg)        raise error, filename + ': ' + msg    if ftype == 'aiff':        return fname    if ftype is None or not ftype in table:        raise error, '%s: unsupported audio file type %r' % (filename, ftype)    (fd, temp) = tempfile.mkstemp()    os.close(fd)    temps.append(temp)    sts = table[ftype].copy(fname, temp)    if sts:        raise error, filename + ': conversion to aiff failed'    return temp