ref: c58df62d069d2a90714fc46be4a7c44ddfffba51
dir: /sys/lib/python/toaiff.py/
"""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 os import tempfile import pipes import 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