simple example how to use azul3d.org/audio

main.go

// simple example how to use azul3d.org/audio
//
// run it with SoX
//   go run main.go | play -
//
// or save it to a file
//   go run main.go > test.wav
//
package main

import (
	"azul3d.org/audio.v1"
	"azul3d.org/audio/wav.v1"
	"math"
	"os"
)

var (
	amp   = 0.5
	freq1 = 220.0
	freq2 = 880.0
	dur   = 1.5
)

func main() {
	bf := audio.NewBuffer(audio.PCM16Samples{})
	enc, err := wav.NewEncoder(os.Stdout, audio.Config{44100, 2})

	if err != nil {
		panic(err)
	}

	defer enc.Close()

	q := 2 * math.Pi / 22050

	for i := 0.0; i < dur*44100.0; i++ {
		bf.WriteSample(audio.F64(math.Sin(i*freq1*q) * amp))
		bf.WriteSample(audio.F64(math.Sin(i*freq2*q) * amp))
	}

	bf.WriteTo(enc)
}