code: def getnframes(self):
      if self._data_size == AUDIO_UNKNOWN_SIZE:
          return AUDIO_UNKNOWN_SIZE
      if self._encoding in _simple_encodings:
          return self._data_size // self._framesize
      return 0
  
imports: from collections import namedtuple
  import warnings
label_desc: Use image node_id 10 for calling the Au_read obj's underlying member method code with example usage: obj.getnframes() and returns: int, AUDIO_UNKNOWN_SIZE, unknown