package main

import (
	"math/rand"
	"time"

	"github.com/faiface/beep"
	"github.com/faiface/beep/effects"
	"github.com/faiface/beep/speaker"
)

func noise() beep.Streamer {
	return beep.StreamerFunc(func(samples [][2]float64) (n int, ok bool) {
		for i := range samples {
			samples[i][0] = rand.Float64()*2 - 1
			samples[i][1] = rand.Float64()*2 - 1
		}
		return len(samples), true
	})
}

func main() {
	sr := beep.SampleRate(44100)
	speaker.Init(sr, sr.N(time.Second/10))

	eq := effects.NewEqualizer(noise(), sr, effects.MonoEqualizerSections{
		{F0: 200, Bf: 5, GB: 3, G0: 0, G: 8},
		{F0: 250, Bf: 5, GB: 3, G0: 0, G: 10},
		{F0: 300, Bf: 5, GB: 3, G0: 0, G: 12},
		{F0: 350, Bf: 5, GB: 3, G0: 0, G: 14},
		{F0: 10000, Bf: 8000, GB: 3, G0: 0, G: -100},
	})

	speaker.Play(eq)
	select {}
}