go-audio / transforms Goto Github PK

func Panning(buf *audio.FloatBuffer, rate float64) error {
	if buf == nil || buf.Format == nil || buf.Format.NumChannels != 2 {
		return audio.ErrInvalidBuffer
	}

	step := 1 / rate

	for a, pan := 0.0, 0.0; a <= rate; a += 1.0 {
		switch {
		case pan == 0.5:
			fmt.Println(a, " | ", pan, " | N")
		case pan < 0.5:
			fmt.Println(a, " | ", pan, " | L")
			for i := 0; i+2 <= len(buf.Data); i += 2 {
				buf.Data[i+1] *= (pan * 2)
			}
		case pan > 0.5:
			fmt.Println(a, " | ", pan, " | R")
			for i := 0; i+2 <= len(buf.Data); i += 2 {
				buf.Data[i] *= ((1 - pan) * 2)
			}
		}
		pan += step
	}
	return nil
}```