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open_read_prototype = CFUNCTYPE( POINTER( sox_format_t ) , c_char_p , \								sox_signalinfo_t , sox_encodinginfo_t , c_char_p )open_read_paramflags = \		( 1 , 'path' , None ) , \		( 1 , 'signal' , None ) , \		( 1 , 'encoding' , None ) , \		( 1 , 'filetype' , None )open_read = open_read_prototype( ( "sox_open_read" , libsox ) , open_read_paramflags )open_read.errcheck = not_null_pointer/home/ryan/<ipython console> in <module>()/home/ryan/src/soxwrap.py in __init__(self, infile, outfile)    330         def __init__( self , infile , outfile ):    331                 format_init()--> 332                 self.in_format = open_read( path=infile )    333                 self.out_format = open_write( outfile , signal=self.in_format[0].signal )    334 <class 'ctypes.ArgumentError'>: argument 2: <type 'exceptions.TypeError'>: expected sox_signalinfo_t instance instead of NoneType