code: def readframes(self, nframes):
      if self._encoding in _simple_encodings:
          if nframes == AUDIO_UNKNOWN_SIZE:
              data = self._file.read()
          else:
              data = self._file.read(nframes * self._framesize)
          self._soundpos += len(data) // self._framesize
          if self._encoding == AUDIO_FILE_ENCODING_MULAW_8:
              with warnings.catch_warnings():
                  warnings.simplefilter(
                      "ignore", category=DeprecationWarning
                  )
                  import audioop
              data = audioop.ulaw2lin(data, self._sampwidth)
          return data
      return None
  
imports: from collections import namedtuple
  import warnings
label_desc: Use image node_id 16 for calling the Au_read obj's underlying member method code with example usage: obj.readframes(nframes) and returns: None, data