ebiten/docs/examples/audio.html

<!DOCTYPE html>
<meta charset="utf-8">
<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/audio.png">
<meta name="description" content="Ebiten example - audio">
<link rel="shortcut icon" href="../favicon.png" type="image/png" >
<link rel="icon" href="../favicon.png" type="image/png" >
<title>Ebiten example - audio</title>

<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
<link rel="stylesheet" href="../stylesheets/highlight-github.css">
<link rel="stylesheet" href="../stylesheets/ebiten.css">
<script src="../scripts/googleanalytics.js"></script>

<nav class="navbar"><div class="container">
  <nav class="d-flex flex-row" style="width: 100%;">
    <div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
    <ul class="nav">
      <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
      <li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
      <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
      <li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a>
    </ul>
  </nav>
</div></nav>

<main><div class="container">

  <h2>Ebiten example - audio</h2>
  <iframe src="audio.content.html" width="640" height="480"></iframe>
  <div class="card"><pre class="card-body"><code class="language-go">// &#43;build example

// This is an example to implement an audio player.
// See examples/wav for a simpler example to play a sound file.

package main

import (
        &#34;fmt&#34;
        &#34;image/color&#34;
        &#34;io/ioutil&#34;
        &#34;log&#34;
        &#34;time&#34;

        &#34;github.com/hajimehoshi/ebiten&#34;
        &#34;github.com/hajimehoshi/ebiten/audio&#34;
        &#34;github.com/hajimehoshi/ebiten/audio/mp3&#34;
        &#34;github.com/hajimehoshi/ebiten/audio/wav&#34;
        &#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)

const (
        screenWidth  = 320
        screenHeight = 240

        // This sample rate doesn&#39;t match with wav/mp3&#39;s sample rate,
        // but decoders adjust them.
        sampleRate = 48000
)

var (
        playerBarColor     = color.RGBA{0x80, 0x80, 0x80, 0xff}
        playerCurrentColor = color.RGBA{0xff, 0xff, 0xff, 0xff}
)

// Input manages the current input state to detect keys &#39;just pressed&#39;.
//
// Note: &#39;just pressed&#39; is a very common idiom.
// There is a plan to create a new package for input utility.
// See https://github.com/hajimehoshi/ebiten/issues/415.
type Input struct {
        mouseButtonStates map[ebiten.MouseButton]int
        keyStates         map[ebiten.Key]int
}

func (i *Input) update() {
        for _, key := range []ebiten.Key{ebiten.KeyP, ebiten.KeyS, ebiten.KeyX, ebiten.KeyZ, ebiten.KeyB} {
                if !ebiten.IsKeyPressed(key) {
                        i.keyStates[key] = 0
                } else {
                        i.keyStates[key]&#43;&#43;
                }
        }
        if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
                i.mouseButtonStates[ebiten.MouseButtonLeft] = 0
        } else {
                i.mouseButtonStates[ebiten.MouseButtonLeft]&#43;&#43;
        }
}

func (i *Input) isKeyJustPressed(key ebiten.Key) bool {
        return i.keyStates[key] == 1
}

func (i *Input) isKeyPressed(key ebiten.Key) bool {
        return i.keyStates[key] &gt; 0
}

func (i *Input) isMouseButtonJustPressed(mouseButton ebiten.MouseButton) bool {
        return i.mouseButtonStates[mouseButton] == 1
}

// Player represents the current audio state.
type Player struct {
        input        *Input
        audioContext *audio.Context
        audioPlayer  *audio.Player
        current      time.Duration
        total        time.Duration
        seBytes      []byte
        seCh         chan []byte
        volume128    int
}

func playerBarRect() (x, y, w, h int) {
        w, h = 300, 4
        x = (screenWidth - w) / 2
        y = screenHeight - h - 16
        return
}

func NewPlayer(audioContext *audio.Context) (*Player, error) {
        const bytesPerSample = 4 // TODO: This should be defined in audio package
        wavF, err := ebitenutil.OpenFile(&#34;_resources/audio/jab.wav&#34;)
        if err != nil {
                return nil, err
        }
        mp3F, err := ebitenutil.OpenFile(&#34;_resources/audio/classic.mp3&#34;)
        if err != nil {
                return nil, err
        }
        s, err := mp3.Decode(audioContext, mp3F)
        if err != nil {
                return nil, err
        }
        p, err := audio.NewPlayer(audioContext, s)
        if err != nil {
                return nil, err
        }
        player := &amp;Player{
                input: &amp;Input{
                        mouseButtonStates: map[ebiten.MouseButton]int{},
                        keyStates:         map[ebiten.Key]int{},
                },
                audioContext: audioContext,
                audioPlayer:  p,
                total:        time.Second * time.Duration(s.Length()) / bytesPerSample / sampleRate,
                volume128:    128,
                seCh:         make(chan []byte),
        }
        if player.total == 0 {
                player.total = 1
        }
        player.audioPlayer.Play()
        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
                }
                player.seCh &lt;- b
        }()
        return player, nil
}

func (p *Player) update() error {
        p.input.update()
        select {
        case p.seBytes = &lt;-p.seCh:
                close(p.seCh)
                p.seCh = nil
        default:
        }

        if p.audioPlayer.IsPlaying() {
                p.current = p.audioPlayer.Current()
        }
        p.seekBarIfNeeded()
        p.switchPlayStateIfNeeded()
        p.playSEIfNeeded()
        p.updateVolumeIfNeeded()

        if p.input.isKeyJustPressed(ebiten.KeyB) {
                b := ebiten.IsRunnableInBackground()
                ebiten.SetRunnableInBackground(!b)
        }
        return nil
}

func (p *Player) playSEIfNeeded() {
        if p.seBytes == nil {
                // Bytes for the SE is not loaded yet.
                return
        }

        if !p.input.isKeyJustPressed(ebiten.KeyP) {
                return
        }
        sePlayer, _ := audio.NewPlayerFromBytes(p.audioContext, p.seBytes)
        sePlayer.Play()
}

func (p *Player) updateVolumeIfNeeded() {
        if p.input.isKeyPressed(ebiten.KeyZ) {
                p.volume128--
        }
        if p.input.isKeyPressed(ebiten.KeyX) {
                p.volume128&#43;&#43;
        }
        if p.volume128 &lt; 0 {
                p.volume128 = 0
        }
        if 128 &lt; p.volume128 {
                p.volume128 = 128
        }
        p.audioPlayer.SetVolume(float64(p.volume128) / 128)
}

func (p *Player) switchPlayStateIfNeeded() {
        if !p.input.isKeyJustPressed(ebiten.KeyS) {
                return
        }
        if p.audioPlayer.IsPlaying() {
                p.audioPlayer.Pause()
                return
        }
        p.audioPlayer.Play()
}

func (p *Player) seekBarIfNeeded() {
        if !p.input.isMouseButtonJustPressed(ebiten.MouseButtonLeft) {
                return
        }

        // Calculate the next seeking position from the current cursor position.
        x, y := ebiten.CursorPosition()
        bx, by, bw, bh := playerBarRect()
        const padding = 4
        if y &lt; by-padding || by&#43;bh&#43;padding &lt;= y {
                return
        }
        if x &lt; bx || bx&#43;bw &lt;= x {
                return
        }
        pos := time.Duration(x-bx) * p.total / time.Duration(bw)
        p.current = pos
        p.audioPlayer.Seek(pos)
}

func (p *Player) close() error {
        return p.audioPlayer.Close()
}

func (p *Player) draw(screen *ebiten.Image) {
        // Draw the bar.
        x, y, w, h := playerBarRect()
        ebitenutil.DrawRect(screen, float64(x), float64(y), float64(w), float64(h), playerBarColor)

        // Draw the cursor on the bar.
        c := p.current
        cw, ch := 4, 10
        cx := int(time.Duration(w)*c/p.total) &#43; x - cw/2
        cy := y - (ch-h)/2
        ebitenutil.DrawRect(screen, float64(cx), float64(cy), float64(cw), float64(ch), playerCurrentColor)

        // Compose the curren time text.
        m := (c / time.Minute) % 100
        s := (c / time.Second) % 60
        currentTimeStr := fmt.Sprintf(&#34;%02d:%02d&#34;, m, s)

        // Draw the debug message.
        msg := fmt.Sprintf(`FPS: %0.2f
Press S to toggle Play/Pause
Press P to play SE
Press Z or X to change volume of the music
Press B to switch the run-in-background state
Current Time: %s`, ebiten.CurrentFPS(), currentTimeStr)
        ebitenutil.DebugPrint(screen, msg)
}

var (
        musicPlayer *Player
)

func update(screen *ebiten.Image) error {
        if err := musicPlayer.update(); err != nil {
                return err
        }

        if ebiten.IsRunningSlowly() {
                return nil
        }

        musicPlayer.draw(screen)
        return nil
}

func main() {
        audioContext, err := audio.NewContext(sampleRate)
        if err != nil {
                log.Fatal(err)
        }

        musicPlayer, err = NewPlayer(audioContext)
        if err != nil {
                log.Fatal(err)
        }
        if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Audio (Ebiten Demo)&#34;); err != nil {
                log.Fatal(err)
        }
        if err := musicPlayer.close(); err != nil {
                log.Fatal(err)
        }
}
</code></pre></div>

</div></main>

<footer><div class="container">
  <p>© 2013 Hajime Hoshi</p>
  <p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>
  <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>

<script src="../scripts/highlight.pack.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
doc: Add new examples 2016-04-13 18:26:31 +02:00			`<!DOCTYPE html>`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`<meta charset="utf-8">`
doc: Add og:image 2017-08-18 16:43:08 +02:00			`<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/audio.png">`
			`<meta name="description" content="Ebiten example - audio">`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`<link rel="shortcut icon" href="../favicon.png" type="image/png" >`
			`<link rel="icon" href="../favicon.png" type="image/png" >`
			`<title>Ebiten example - audio</title>`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00
doc: Use relative path 2016-08-27 17:48:15 +02:00			`<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">`
			`<link rel="stylesheet" href="../stylesheets/highlight-github.css">`
			`<link rel="stylesheet" href="../stylesheets/ebiten.css">`
doc: Bug fix: wrong path 2016-09-02 18:55:07 +02:00			`<script src="../scripts/googleanalytics.js"></script>`
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00
doc: Renewal 2017-08-17 20:00:05 +02:00			`<nav class="navbar"><div class="container">`
doc: Update bootstrap version to 4 2017-08-17 18:22:19 +02:00			`<nav class="d-flex flex-row" style="width: 100%;">`
doc: Renewal 2017-08-17 20:00:05 +02:00			`<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>`
doc: Update bootstrap version to 4 2017-08-17 18:22:19 +02:00			`<ul class="nav">`
			`<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>`
			`<li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>`
			`<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>`
docs: Add a link to the playground to example pages 2017-11-09 18:07:16 +01:00			`<li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a>`
doc: Fix thumbnail size 2016-08-26 19:37:08 +02:00			`</ul>`
			`</nav>`
doc: Renewal 2017-08-17 20:00:05 +02:00			`</div></nav>`
doc: Add new examples 2016-04-13 18:26:31 +02:00
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`<main><div class="container">`

doc: Adjust fonts 2016-08-26 20:18:16 +02:00			`<h2>Ebiten example - audio</h2>`
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`<iframe src="audio.content.html" width="640" height="480"></iframe>`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`<div class="card"><pre class="card-body"><code class="language-go">// +build example`
doc: go generate; Add style.css 2016-08-26 16:33:36 +02:00
doc: Update examples 2017-08-17 16:13:15 +02:00			`// This is an example to implement an audio player.`
			`// See examples/wav for a simpler example to play a sound file.`

doc: go generate; Add style.css 2016-08-26 16:33:36 +02:00			`package main`
doc: Add new examples 2016-04-13 18:26:31 +02:00
			`import (`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`"fmt"`
			`"image/color"`
			`"io/ioutil"`
			`"log"`
			`"time"`
doc: Add new examples 2016-04-13 18:26:31 +02:00
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`"github.com/hajimehoshi/ebiten"`
			`"github.com/hajimehoshi/ebiten/audio"`
doc: Update 2017-07-01 10:10:55 +02:00			`"github.com/hajimehoshi/ebiten/audio/mp3"`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`"github.com/hajimehoshi/ebiten/audio/wav"`
			`"github.com/hajimehoshi/ebiten/ebitenutil"`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`)`

			`const (`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`screenWidth = 320`
			`screenHeight = 240`
doc: Update 2017-06-09 04:43:50 +02:00
doc: Update 2017-07-01 10:10:55 +02:00			`// This sample rate doesn't match with wav/mp3's sample rate,`
doc: Update 2017-06-09 04:43:50 +02:00			`// but decoders adjust them.`
			`sampleRate = 48000`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`)`

			`var (`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`playerBarColor = color.RGBA{0x80, 0x80, 0x80, 0xff}`
			`playerCurrentColor = color.RGBA{0xff, 0xff, 0xff, 0xff}`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`)`

docs: Update 2018-01-24 04:06:12 +01:00			`// Input manages the current input state to detect keys 'just pressed'.`
			`//`
			`// Note: 'just pressed' is a very common idiom.`
			`// There is a plan to create a new package for input utility.`
			`// See https://github.com/hajimehoshi/ebiten/issues/415.`
doc: Update 2017-06-09 04:43:50 +02:00			`type Input struct {`
			`mouseButtonStates map[ebiten.MouseButton]int`
			`keyStates map[ebiten.Key]int`
			`}`

			`func (i *Input) update() {`
doc: Update examples 2017-08-17 16:13:15 +02:00			`for _, key := range []ebiten.Key{ebiten.KeyP, ebiten.KeyS, ebiten.KeyX, ebiten.KeyZ, ebiten.KeyB} {`
doc: Update 2017-06-09 04:43:50 +02:00			`if !ebiten.IsKeyPressed(key) {`
			`i.keyStates[key] = 0`
			`} else {`
			`i.keyStates[key]++`
			`}`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {`
			`i.mouseButtonStates[ebiten.MouseButtonLeft] = 0`
			`} else {`
			`i.mouseButtonStates[ebiten.MouseButtonLeft]++`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`func (i *Input) isKeyJustPressed(key ebiten.Key) bool {`
doc: Update 2017-06-09 04:43:50 +02:00			`return i.keyStates[key] == 1`
			`}`

			`func (i *Input) isKeyPressed(key ebiten.Key) bool {`
			`return i.keyStates[key] > 0`
			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`func (i *Input) isMouseButtonJustPressed(mouseButton ebiten.MouseButton) bool {`
doc: Update 2017-06-09 04:43:50 +02:00			`return i.mouseButtonStates[mouseButton] == 1`
			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`// Player represents the current audio state.`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`type Player struct {`
doc: Update 2017-06-09 04:43:50 +02:00			`input *Input`
			`audioContext *audio.Context`
			`audioPlayer *audio.Player`
doc: Update 2017-07-01 10:10:55 +02:00			`current time.Duration`
doc: Update 2017-06-09 04:43:50 +02:00			`total time.Duration`
docs: Update 2018-01-24 04:06:12 +01:00			`seBytes []byte`
			`seCh chan []byte`
doc: Update 2017-06-09 04:43:50 +02:00			`volume128 int`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

			`func playerBarRect() (x, y, w, h int) {`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`w, h = 300, 4`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`x = (screenWidth - w) / 2`
			`y = screenHeight - h - 16`
			`return`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

doc: Update 2017-06-09 04:43:50 +02:00			`func NewPlayer(audioContext audio.Context) (Player, error) {`
			`const bytesPerSample = 4 // TODO: This should be defined in audio package`
docs: Update 2018-01-29 15:39:30 +01:00			`wavF, err := ebitenutil.OpenFile("_resources/audio/jab.wav")`
doc: Update 2017-06-09 04:43:50 +02:00			`if err != nil {`
			`return nil, err`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
docs: Update 2018-01-29 15:39:30 +01:00			`mp3F, err := ebitenutil.OpenFile("_resources/audio/classic.mp3")`
doc: Update 2017-06-09 04:43:50 +02:00			`if err != nil {`
			`return nil, err`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-07-01 10:10:55 +02:00			`s, err := mp3.Decode(audioContext, mp3F)`
doc: Update 2017-06-09 04:43:50 +02:00			`if err != nil {`
			`return nil, err`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`p, err := audio.NewPlayer(audioContext, s)`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`if err != nil {`
doc: Update 2017-06-09 04:43:50 +02:00			`return nil, err`
			`}`
			`player := &Player{`
			`input: &Input{`
			`mouseButtonStates: map[ebiten.MouseButton]int{},`
			`keyStates: map[ebiten.Key]int{},`
			`},`
			`audioContext: audioContext,`
			`audioPlayer: p,`
docs: Update 2018-01-24 04:06:12 +01:00			`total: time.Second * time.Duration(s.Length()) / bytesPerSample / sampleRate,`
doc: Update 2017-06-09 04:43:50 +02:00			`volume128: 128,`
docs: Update 2018-01-24 04:06:12 +01:00			`seCh: make(chan []byte),`
doc: Update 2017-06-09 04:43:50 +02:00			`}`
doc: Update 2017-07-01 10:10:55 +02:00			`if player.total == 0 {`
			`player.total = 1`
			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`player.audioPlayer.Play()`
			`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`
			`}`
			`player.seCh <- b`
			`}()`
			`return player, nil`
			`}`

			`func (p *Player) update() error {`
			`p.input.update()`
			`select {`
			`case p.seBytes = <-p.seCh:`
			`close(p.seCh)`
			`p.seCh = nil`
			`default:`
			`}`
docs: Update 2018-01-24 04:06:12 +01:00
doc: Update 2017-07-01 10:10:55 +02:00			`if p.audioPlayer.IsPlaying() {`
			`p.current = p.audioPlayer.Current()`
			`}`
docs: Update 2018-01-24 04:06:12 +01:00			`p.seekBarIfNeeded()`
			`p.switchPlayStateIfNeeded()`
			`p.playSEIfNeeded()`
			`p.updateVolumeIfNeeded()`

			`if p.input.isKeyJustPressed(ebiten.KeyB) {`
doc: Update examples 2017-08-17 16:13:15 +02:00			`b := ebiten.IsRunnableInBackground()`
			`ebiten.SetRunnableInBackground(!b)`
			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`return nil`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`func (p *Player) playSEIfNeeded() {`
doc: Update 2017-06-09 04:43:50 +02:00			`if p.seBytes == nil {`
docs: Update 2018-01-24 04:06:12 +01:00			`// Bytes for the SE is not loaded yet.`
docs: Update example pages 2017-03-04 15:27:25 +01:00			`return`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
docs: Update 2018-01-24 04:06:12 +01:00
			`if !p.input.isKeyJustPressed(ebiten.KeyP) {`
doc: Update 2017-06-09 04:43:50 +02:00			`return`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`sePlayer, _ := audio.NewPlayerFromBytes(p.audioContext, p.seBytes)`
			`sePlayer.Play()`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`func (p *Player) updateVolumeIfNeeded() {`
doc: Update 2017-06-09 04:43:50 +02:00			`if p.input.isKeyPressed(ebiten.KeyZ) {`
			`p.volume128--`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`if p.input.isKeyPressed(ebiten.KeyX) {`
			`p.volume128++`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`if p.volume128 < 0 {`
			`p.volume128 = 0`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`if 128 < p.volume128 {`
			`p.volume128 = 128`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`p.audioPlayer.SetVolume(float64(p.volume128) / 128)`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`func (p *Player) switchPlayStateIfNeeded() {`
			`if !p.input.isKeyJustPressed(ebiten.KeyS) {`
docs: Update example pages 2017-03-04 15:27:25 +01:00			`return`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`if p.audioPlayer.IsPlaying() {`
			`p.audioPlayer.Pause()`
docs: Update example pages 2017-03-04 15:27:25 +01:00			`return`
doc: Ogg/Vorbis is now available on Safari (#294) 2016-11-28 19:42:16 +01:00			`}`
doc: Update 2017-06-09 04:43:50 +02:00			`p.audioPlayer.Play()`
			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`func (p *Player) seekBarIfNeeded() {`
			`if !p.input.isMouseButtonJustPressed(ebiten.MouseButtonLeft) {`
docs: Update example pages 2017-03-04 15:27:25 +01:00			`return`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
docs: Update 2018-01-24 04:06:12 +01:00
			`// Calculate the next seeking position from the current cursor position.`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`x, y := ebiten.CursorPosition()`
			`bx, by, bw, bh := playerBarRect()`
			`const padding = 4`
			`if y < by-padding \|\| by+bh+padding <= y {`
docs: Update example pages 2017-03-04 15:27:25 +01:00			`return`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
			`if x < bx \|\| bx+bw <= x {`
docs: Update example pages 2017-03-04 15:27:25 +01:00			`return`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
			`pos := time.Duration(x-bx) * p.total / time.Duration(bw)`
doc: Update 2017-07-01 10:10:55 +02:00			`p.current = pos`
			`p.audioPlayer.Seek(pos)`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

			`func (p *Player) close() error {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`return p.audioPlayer.Close()`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

doc: Update 2017-06-09 04:43:50 +02:00			`func (p Player) draw(screen ebiten.Image) {`
docs: Update 2018-01-24 04:06:12 +01:00			`// Draw the bar.`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`x, y, w, h := playerBarRect()`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`ebitenutil.DrawRect(screen, float64(x), float64(y), float64(w), float64(h), playerBarColor)`

docs: Update 2018-01-24 04:06:12 +01:00			`// Draw the cursor on the bar.`
doc: Update 2017-07-01 10:10:55 +02:00			`c := p.current`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`cw, ch := 4, 10`
doc: Update 2017-06-09 04:43:50 +02:00			`cx := int(time.Duration(w)*c/p.total) + x - cw/2`
			`cy := y - (ch-h)/2`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`ebitenutil.DrawRect(screen, float64(cx), float64(cy), float64(cw), float64(ch), playerCurrentColor)`
doc: Add new examples 2016-04-13 18:26:31 +02:00
docs: Update 2018-01-24 04:06:12 +01:00			`// Compose the curren time text.`
			`m := (c / time.Minute) % 100`
			`s := (c / time.Second) % 60`
			`currentTimeStr := fmt.Sprintf("%02d:%02d", m, s)`

			`// Draw the debug message.`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			msg := fmt.Sprintf(`FPS: %0.2f
doc: Add new examples 2016-04-13 18:26:31 +02:00			`Press S to toggle Play/Pause`
			`Press P to play SE`
			`Press Z or X to change volume of the music`
doc: Update examples 2017-08-17 16:13:15 +02:00			`Press B to switch the run-in-background state`
docs: Update 2018-01-24 04:06:12 +01:00			Current Time: %s`, ebiten.CurrentFPS(), currentTimeStr)
docs: Update example pages 2017-03-04 15:27:25 +01:00			`ebitenutil.DebugPrint(screen, msg)`
doc: Update 2017-06-09 04:43:50 +02:00			`}`

docs: Update 2018-01-24 04:06:12 +01:00			`var (`
			`musicPlayer *Player`
			`)`

doc: Update 2017-06-09 04:43:50 +02:00			`func update(screen *ebiten.Image) error {`
			`if err := musicPlayer.update(); err != nil {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`return err`
			`}`
docs: Update 2018-01-24 04:06:12 +01:00
doc: Update 2017-06-09 04:43:50 +02:00			`if ebiten.IsRunningSlowly() {`
			`return nil`
			`}`
docs: Update 2018-01-24 04:06:12 +01:00
doc: Update 2017-06-09 04:43:50 +02:00			`musicPlayer.draw(screen)`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`return nil`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`

			`func main() {`
doc: Update 2017-06-09 04:43:50 +02:00			`audioContext, err := audio.NewContext(sampleRate)`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`if err != nil {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`log.Fatal(err)`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`
doc: Explaing about audio syncing 2017-07-13 19:26:41 +02:00
doc: Update 2017-06-09 04:43:50 +02:00			`musicPlayer, err = NewPlayer(audioContext)`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`if err != nil {`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`log.Fatal(err)`
			`}`
			`if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Audio (Ebiten Demo)"); err != nil {`
			`log.Fatal(err)`
			`}`
docs: Update 2018-01-24 04:06:12 +01:00			`if err := musicPlayer.close(); err != nil {`
			`log.Fatal(err)`
doc: Change indent size 4 -> 8 2016-08-26 22:36:52 +02:00			`}`
doc: Add new examples 2016-04-13 18:26:31 +02:00			`}`
doc: Pass W3C validator 2017-08-18 16:26:17 +02:00			`</code></pre></div>`
doc: Add new examples 2016-04-13 18:26:31 +02:00
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`</div></main>`

			`<footer><div class="container">`
			`<p>© 2013 Hajime Hoshi</p>`
doc: Add 'the' 2016-08-28 00:10:41 +02:00			`<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>`
doc: Apply bootstrap 2016-08-26 19:28:57 +02:00			`<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>`
doc: Add new examples 2016-04-13 18:26:31 +02:00
doc: Use relative path 2016-08-27 17:48:15 +02:00			`<script src="../scripts/highlight.pack.js"></script>`
doc: Highlight code 2016-08-27 07:00:06 +02:00			`<script>hljs.initHighlightingOnLoad();</script>`