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<!DOCTYPE html>
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< title > Ebiten example - audio< / title >
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< header class = "navbar" > < div class = "container" >
< div class = "navbar-header" >
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< a class = "navbar-brand" href = ".." > Ebiten< / a >
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< li > < a href = "https://github.com/hajimehoshi/ebiten" > GitHub< / a > < / li >
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< li > < a href = "https://godoc.org/github.com/hajimehoshi/ebiten" > GoDoc< / a > < / li >
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< / header >
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< main > < div class = "container" >
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< h2 > Ebiten example - audio< / h2 >
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< iframe src = "audio.content.html" width = "640" height = "480" > < / iframe >
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< pre > < code class = "language-go" > // + build example
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package main
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import (
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" fmt"
" image/color"
" io/ioutil"
" log"
" time"
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" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/audio"
" github.com/hajimehoshi/ebiten/audio/vorbis"
" github.com/hajimehoshi/ebiten/audio/wav"
" github.com/hajimehoshi/ebiten/ebitenutil"
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)
const (
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screenWidth = 320
screenHeight = 240
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)
var (
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playerBarImage *ebiten.Image
playerCurrentImage *ebiten.Image
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)
func init() {
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var err error
playerBarImage, err = ebiten.NewImage(300, 4, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := playerBarImage.Fill(& color.RGBA{0x80, 0x80, 0x80, 0xff}); err != nil {
log.Fatal(err)
}
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playerCurrentImage, err = ebiten.NewImage(4, 10, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := playerCurrentImage.Fill(& color.RGBA{0xff, 0xff, 0xff, 0xff}); err != nil {
log.Fatal(err)
}
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}
type Player struct {
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audioPlayer *audio.Player
total time.Duration
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}
var (
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audioContext *audio.Context
musicPlayer *Player
seBytes []byte
musicCh = make(chan *Player)
seCh = make(chan []byte)
mouseButtonState = map[ebiten.MouseButton]int{}
keyState = map[ebiten.Key]int{}
volume128 = 128
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)
func playerBarRect() (x, y, w, h int) {
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w, h = playerBarImage.Size()
x = (screenWidth - w) / 2
y = screenHeight - h - 16
return
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}
func (p *Player) updateSE() error {
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if seBytes == nil {
return nil
}
if !ebiten.IsKeyPressed(ebiten.KeyP) {
keyState[ebiten.KeyP] = 0
return nil
}
keyState[ebiten.KeyP]+ +
if keyState[ebiten.KeyP] != 1 {
return nil
}
sePlayer, err := audio.NewPlayerFromBytes(audioContext, seBytes)
if err != nil {
return err
}
return sePlayer.Play()
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}
func (p *Player) updateVolume() error {
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if p.audioPlayer == nil {
return nil
}
if ebiten.IsKeyPressed(ebiten.KeyZ) {
volume128--
}
if ebiten.IsKeyPressed(ebiten.KeyX) {
volume128+ +
}
if volume128 < 0 {
volume128 = 0
}
if 128 < volume128 {
volume128 = 128
}
p.audioPlayer.SetVolume(float64(volume128) / 128)
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return nil
}
func (p *Player) updatePlayPause() error {
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if p.audioPlayer == nil {
return nil
}
if !ebiten.IsKeyPressed(ebiten.KeyS) {
keyState[ebiten.KeyS] = 0
return nil
}
keyState[ebiten.KeyS]+ +
if keyState[ebiten.KeyS] != 1 {
return nil
}
if p.audioPlayer.IsPlaying() {
return p.audioPlayer.Pause()
}
return p.audioPlayer.Play()
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}
func (p *Player) updateBar() error {
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if p.audioPlayer == nil {
return nil
}
if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
mouseButtonState[ebiten.MouseButtonLeft] = 0
return nil
}
mouseButtonState[ebiten.MouseButtonLeft]+ +
if mouseButtonState[ebiten.MouseButtonLeft] != 1 {
return nil
}
x, y := ebiten.CursorPosition()
bx, by, bw, bh := playerBarRect()
const padding = 4
if y < by-padding || by+ bh+ padding < = y {
return nil
}
if x < bx || bx+ bw < = x {
return nil
}
pos := time.Duration(x-bx) * p.total / time.Duration(bw)
return p.audioPlayer.Seek(pos)
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}
func (p *Player) close() error {
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return p.audioPlayer.Close()
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}
func update(screen *ebiten.Image) error {
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if musicPlayer == nil {
select {
case musicPlayer = < -musicCh:
default:
}
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}
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if seBytes == nil {
select {
case seBytes = < -seCh:
default:
}
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}
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if musicPlayer != nil {
if err := musicPlayer.updateBar(); err != nil {
return err
}
if err := musicPlayer.updatePlayPause(); err != nil {
return err
}
if err := musicPlayer.updateSE(); err != nil {
return err
}
if err := musicPlayer.updateVolume(); err != nil {
return err
}
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}
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op := & ebiten.DrawImageOptions{}
x, y, w, h := playerBarRect()
op.GeoM.Translate(float64(x), float64(y))
if err := screen.DrawImage(playerBarImage, op); err != nil {
return err
}
currentTimeStr := " 00:00"
if musicPlayer != nil {
c := musicPlayer.audioPlayer.Current()
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// Current Time
m := (c / time.Minute) % 100
s := (c / time.Second) % 60
currentTimeStr = fmt.Sprintf(" %02d:%02d" , m, s)
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// Bar
cw, ch := playerCurrentImage.Size()
cx := int(time.Duration(w)*c/musicPlayer.total) + x - cw/2
cy := y - (ch-h)/2
op := & ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(cx), float64(cy))
if err := screen.DrawImage(playerCurrentImage, op); err != nil {
return err
}
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}
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msg := fmt.Sprintf(`FPS: %0.2f
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Press S to toggle Play/Pause
Press P to play SE
Press Z or X to change volume of the music
%s`, ebiten.CurrentFPS(), currentTimeStr)
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if musicPlayer == nil {
msg + = " \nNow Loading..."
}
if err := ebitenutil.DebugPrint(screen, msg); err != nil {
return err
}
if err := audioContext.Update(); err != nil {
return err
}
return nil
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}
func main() {
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wavF, err := ebitenutil.OpenFile(" _resources/audio/jab.wav" )
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if err != nil {
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log.Fatal(err)
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}
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oggF, err := ebitenutil.OpenFile(" _resources/audio/ragtime.ogg" )
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if err != nil {
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log.Fatal(err)
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}
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const sampleRate = 22050
const bytesPerSample = 4 // TODO: This should be defined in audio package
audioContext, err = audio.NewContext(sampleRate)
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if err != nil {
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log.Fatal(err)
}
go func() {
s, err := wav.Decode(audioContext, wavF)
if err != nil {
log.Fatal(err)
return
}
b, err := ioutil.ReadAll(s)
if err != nil {
log.Fatal(err)
return
}
seCh < - b
close(seCh)
}()
go func() {
s, err := vorbis.Decode(audioContext, oggF)
if err != nil {
log.Fatal(err)
return
}
p, err := audio.NewPlayer(audioContext, s)
if err != nil {
log.Fatal(err)
return
}
musicCh < - & Player{
audioPlayer: p,
total: time.Second * time.Duration(s.Size()) / bytesPerSample / sampleRate,
}
close(musicCh)
// TODO: Is this goroutine-safe?
if err := p.Play(); err != nil {
log.Fatal(err)
return
}
}()
if err := ebiten.Run(update, screenWidth, screenHeight, 2, " Audio (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
if musicPlayer != nil {
if err := musicPlayer.close(); err != nil {
log.Fatal(err)
}
}
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}
< / code > < / pre >
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< / div > < / main >
< footer > < div class = "container" >
< p > © 2013 Hajime Hoshi< / p >
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< p > Code is licensed under < a href = "https://github.com/hajimehoshi/ebiten/blob/master/LICENSE" > the Apache License 2.0< / a > .< / p >
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< p > The content of this page is licensed under < a href = "https://creativecommons.org/licenses/by/4.0/" > the Creative Commons Attribution 4.0 License< / a > .< / p >
< / div > < / footer >
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< script src = "../scripts/highlight.pack.js" > < / script >
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