code: def read_opus_header(opus_file):
      opus_file.seek(0)
      pcm_buffer_size = unpack_number(opus_file.read(OPUS_PCM_LEN_SIZE))
      rate = unpack_number(opus_file.read(OPUS_RATE_SIZE))
      channels = unpack_number(opus_file.read(OPUS_CHANNELS_SIZE))
      width = unpack_number(opus_file.read(OPUS_WIDTH_SIZE))
      return pcm_buffer_size, AudioFormat(rate, channels, width)
  
imports: import collections
  import ctypes
  import io
  import math
  import numpy
  import os
  import pyogg
  import tempfile
  import wave
  from .helpers import LimitingPool
  from collections import namedtuple
  from .io import open_remote, remove_remote, copy_remote, is_remote_path
label_desc: Use image node_id 16 for calling a global function with example usage: read_opus_header(opus_file) and returns: pcm_buffer_size,  AudioFormat