code: def normalize(seg, headroom=0.1):
      """
      headroom is how close to the maximum volume to boost the signal up to (specified in dB)
      """
      peak_sample_val = seg.max
  
      # if the max is 0, this audio segment is silent, and can't be normalized
      if peak_sample_val == 0:
          return seg
  
      target_peak = seg.max_possible_amplitude * db_to_float(-headroom)
  
      needed_boost = ratio_to_db(target_peak / peak_sample_val)
      return seg.apply_gain(needed_boost)
  
file_path: pydub/pydub/effects.py
imports: import sys
  import math
  import array
  from .utils import db_to_float, ratio_to_db, register_pydub_effect, make_chunks, audioop, get_min_max_value
  from .silence import split_on_silence
  from .exceptions import TooManyMissingFrames, InvalidDuration
label_desc: Use image node_id 2 for calling a global function with example usage: normalize(seg, headroom) and returns: seg, seg