Bytebeats in golang

bytebeat.go

package main

import (
    "os"
    "io"

    "github.com/hajimehoshi/oto"
    "github.com/sugoiuguu/go-exit"
)

// blippy, epic:         (t*((15&t>>11)%12)&55-(t>>5|t>>12)|t*(t>>10)*32)-1
// atmospheric, hopeful: t*3&(t>>10)|t*12&(t>>10)|t*10&((t>>8)*55)&128
// expansive rumbles:    t*4&(t>>10)|t*4&(t*6>>8)&t|64
// electric, repetitive: t*(t+(t>>9|t>>13))%40&120
func beat(t int) byte {
    return byte(t*3&(t>>10)|t*12&(t>>10)|t*10&((t>>8)*55)&128)
}

func main() {
    defer exit.Handler()

    // get new player
    p, err := oto.NewPlayer(8000, 1, 1, 8192)
    if err != nil {
        exit.WithMsg(os.Stderr, 1, "Error: %s", err)
    }
    defer p.Close()

    // create a pipe to write samples to,
    // and read from it in the player
    r, w, err := os.Pipe()
    if err != nil {
        exit.WithMsg(os.Stderr, 1, "Error: %s", err)
    }
    defer r.Close()
    defer w.Close()

    // generate samples
    go func() {
        var b [1]byte
        s := b[0:]
        for t := 0;; t++ {
            b[0] = beat(t)
            w.Write(s)
        }
    }()

    // play the generated samples
    if _,err := io.Copy(p, r); err != nil {
        exit.WithMsg(os.Stderr, 1, "Error: %s", err)
    }
}