code: func (d *Decoder) String() string {
  	out := fmt.Sprintf("Format: %s - %s", string(d.Format[:]), string(d.FormatID[:]))
  	out += fmt.Sprintf("%d channels @ %d - ", d.ChannelsPerFrame, int(d.SampleRate))
  	out += fmt.Sprintf("data size: %d", d.AudioDataSize)
  
  	return out
  }
docs: // String implements the stringer interface