code: def decoder_pipe(
      decoder_op, fnames, sample_rate, downmix, quality, dtype
  ):
      encoded, _ = fn.readers.file(files=fnames)
      decoded, rates = decoder_op(
          encoded,
          sample_rate=sample_rate,
          downmix=downmix,
          quality=quality,
          dtype=dtype,
      )
      return decoded, rates
  
imports: from nvidia.dali import Pipeline, pipeline_def
  import nvidia.dali.fn
  import nvidia.dali.ops
  import nvidia.dali.types
  import scipy.io.wavfile
  import numpy
  import os
  from test_audio_decoder_utils import generate_waveforms, rosa_resample
  from test_utils import compare_pipelines, get_files
label_desc: Use image node_id 3 for calling a global function with example usage: decoder_pipe(decoder_op, fnames, sample_rate, downmix, quality, dtype) and returns: decoded,  rates