how to calculate Signal-to-noise ratio and vocal amplitude from wav file?

[ilaer]

i need to read wav file , calclate Signal-to-noise ratio and vocal amplitude .
my ConvertToDecibel code:

func ConvertToDecibel(arr int) float64 {
	ref := 1.0
	if arr != 0 {
		lgData := math.Log10(math.Abs(float64(arr)) / ref)
		return lgData * 20
	} else {
		return -60.0
	}

}

can you show your code about it?