code: def _sc_decode(soundcheck):
      
      # We decode binary data. If one of the formats gives us a text
      # string, interpret it as UTF-8.
      if isinstance(soundcheck, six.text_type):
          soundcheck = soundcheck.encode('utf-8')
  
      # SoundCheck tags consist of 10 numbers, each represented by 8
      # characters of ASCII hex preceded by a space.
      try:
          soundcheck = codecs.decode(soundcheck.replace(b' ', b''), 'hex')
          soundcheck = struct.unpack('!iiiiiiiiii', soundcheck)
      except (struct.error, TypeError, binascii.Error):
          # SoundCheck isn't in the format we expect, so return default
          # values.
          return 0.0, 0.0
  
      # SoundCheck stores absolute calculated/measured RMS value in an
      # unknown unit. We need to find the ratio of this measurement
      # compared to a reference value of 1000 to get our gain in dB. We
      # play it safe by using the larger of the two values (i.e., the most
      # attenuation).
      maxgain = max(soundcheck[:2])
      if maxgain > 0:
          gain = math.log10(maxgain / 1000.0) * -10
      else:
          # Invalid gain value found.
          gain = 0.0
  
      # SoundCheck stores peak values as the actual value of the sample,
      # and again separately for the left and right channels. We need to
      # convert this to a percentage of full scale, which is 32768 for a
      # 16 bit sample. Once again, we play it safe by using the larger of
      # the two values.
      peak = max(soundcheck[6:8]) / 32768.0
  
      return round(gain, 2), round(peak, 6)
docs: Convert a Sound Check bytestring value to a (gain, peak) tuple as
      used by ReplayGain.