ebiten/examples/audio/main.go

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// Copyright 2016 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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// This is an example to implement an audio player.
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// See examples/wav for a simpler example to play a sound file.
package main
import (
"bytes"
"fmt"
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"image"
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"image/color"
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_ "image/png"
"io"
"log"
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"time"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/audio"
"github.com/hajimehoshi/ebiten/v2/audio/mp3"
"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
"github.com/hajimehoshi/ebiten/v2/audio/wav"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
raudio "github.com/hajimehoshi/ebiten/v2/examples/resources/audio"
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riaudio "github.com/hajimehoshi/ebiten/v2/examples/resources/images/audio"
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"github.com/hajimehoshi/ebiten/v2/inpututil"
"github.com/hajimehoshi/ebiten/v2/vector"
)
const (
screenWidth = 640
screenHeight = 480
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sampleRate = 48000
)
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var (
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playerBarColor = color.RGBA{0x80, 0x80, 0x80, 0xff}
playerCurrentColor = color.RGBA{0xff, 0xff, 0xff, 0xff}
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)
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var (
playButtonImage *ebiten.Image
pauseButtonImage *ebiten.Image
alertButtonImage *ebiten.Image
)
func init() {
img, _, err := image.Decode(bytes.NewReader(riaudio.Play_png))
if err != nil {
panic(err)
}
playButtonImage = ebiten.NewImageFromImage(img)
img, _, err = image.Decode(bytes.NewReader(riaudio.Pause_png))
if err != nil {
panic(err)
}
pauseButtonImage = ebiten.NewImageFromImage(img)
img, _, err = image.Decode(bytes.NewReader(riaudio.Alert_png))
if err != nil {
panic(err)
}
alertButtonImage = ebiten.NewImageFromImage(img)
}
type musicType int
const (
typeOgg musicType = iota
typeMP3
)
func (t musicType) String() string {
switch t {
case typeOgg:
return "Ogg"
case typeMP3:
return "MP3"
default:
panic("not reached")
}
}
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// Player represents the current audio state.
type Player struct {
game *Game
audioContext *audio.Context
audioPlayer *audio.Player
current time.Duration
total time.Duration
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seBytes []byte
seCh chan []byte
volume128 int
musicType musicType
playButtonPosition image.Point
alertButtonPosition image.Point
}
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func playerBarRect() (x, y, w, h int) {
w, h = 600, 8
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x = (screenWidth - w) / 2
y = screenHeight - h - 16
return
}
func NewPlayer(game *Game, audioContext *audio.Context, musicType musicType) (*Player, error) {
type audioStream interface {
io.ReadSeeker
Length() int64
}
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const bytesPerSample = 4 // TODO: This should be defined in audio package
var s audioStream
switch musicType {
case typeOgg:
var err error
s, err = vorbis.DecodeWithoutResampling(bytes.NewReader(raudio.Ragtime_ogg))
if err != nil {
return nil, err
}
case typeMP3:
var err error
s, err = mp3.DecodeWithoutResampling(bytes.NewReader(raudio.Ragtime_mp3))
if err != nil {
return nil, err
}
default:
panic("not reached")
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}
p, err := audioContext.NewPlayer(s)
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if err != nil {
return nil, err
}
player := &Player{
game: game,
audioContext: audioContext,
audioPlayer: p,
total: time.Second * time.Duration(s.Length()) / bytesPerSample / sampleRate,
volume128: 128,
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seCh: make(chan []byte),
musicType: musicType,
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}
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if player.total == 0 {
player.total = 1
}
const buttonPadding = 16
w := playButtonImage.Bounds().Dx()
player.playButtonPosition.X = (screenWidth - w*2 + buttonPadding*1) / 2
player.playButtonPosition.Y = screenHeight - 160
player.alertButtonPosition.X = player.playButtonPosition.X + w + buttonPadding
player.alertButtonPosition.Y = player.playButtonPosition.Y
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player.audioPlayer.Play()
go func() {
s, err := wav.DecodeWithSampleRate(sampleRate, bytes.NewReader(raudio.Jab_wav))
if err != nil {
log.Fatal(err)
return
}
b, err := io.ReadAll(s)
if err != nil {
log.Fatal(err)
return
}
player.seCh <- b
}()
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return player, nil
}
func (p *Player) Close() error {
return p.audioPlayer.Close()
}
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func (p *Player) update() error {
select {
case p.seBytes = <-p.seCh:
close(p.seCh)
p.seCh = nil
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default:
}
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if p.audioPlayer.IsPlaying() {
p.current = p.audioPlayer.Position()
}
if err := p.seekBarIfNeeded(); err != nil {
return err
}
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p.switchPlayStateIfNeeded()
p.playSEIfNeeded()
p.updateVolumeIfNeeded()
if inpututil.IsKeyJustPressed(ebiten.KeyU) {
b := ebiten.IsRunnableOnUnfocused()
ebiten.SetRunnableOnUnfocused(!b)
}
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return nil
}
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func (p *Player) shouldPlaySE() bool {
if p.seBytes == nil {
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// Bytes for the SE is not loaded yet.
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return false
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}
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if inpututil.IsKeyJustPressed(ebiten.KeyP) {
return true
}
r := image.Rectangle{
Min: p.alertButtonPosition,
Max: p.alertButtonPosition.Add(alertButtonImage.Bounds().Size()),
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}
if image.Pt(ebiten.CursorPosition()).In(r) {
if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
return true
}
}
for _, id := range p.game.justPressedTouchIDs {
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if image.Pt(ebiten.TouchPosition(id)).In(r) {
return true
}
}
return false
}
func (p *Player) playSEIfNeeded() {
if !p.shouldPlaySE() {
return
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}
sePlayer := p.audioContext.NewPlayerFromBytes(p.seBytes)
sePlayer.Play()
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}
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func (p *Player) updateVolumeIfNeeded() {
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if ebiten.IsKeyPressed(ebiten.KeyZ) {
p.volume128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyX) {
p.volume128++
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}
if p.volume128 < 0 {
p.volume128 = 0
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}
if 128 < p.volume128 {
p.volume128 = 128
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}
p.audioPlayer.SetVolume(float64(p.volume128) / 128)
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}
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func (p *Player) shouldSwitchPlayStateIfNeeded() bool {
if inpututil.IsKeyJustPressed(ebiten.KeyS) {
return true
}
r := image.Rectangle{
Min: p.playButtonPosition,
Max: p.playButtonPosition.Add(playButtonImage.Bounds().Size()),
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}
if image.Pt(ebiten.CursorPosition()).In(r) {
if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
return true
}
}
for _, id := range p.game.justPressedTouchIDs {
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if image.Pt(ebiten.TouchPosition(id)).In(r) {
return true
}
}
return false
}
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func (p *Player) switchPlayStateIfNeeded() {
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if !p.shouldSwitchPlayStateIfNeeded() {
return
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}
if p.audioPlayer.IsPlaying() {
p.audioPlayer.Pause()
return
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}
p.audioPlayer.Play()
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}
func (p *Player) justPressedPosition() (int, int, bool) {
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if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
x, y := ebiten.CursorPosition()
return x, y, true
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}
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if len(p.game.justPressedTouchIDs) > 0 {
x, y := ebiten.TouchPosition(p.game.justPressedTouchIDs[0])
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return x, y, true
}
return 0, 0, false
}
func (p *Player) seekBarIfNeeded() error {
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// Calculate the next seeking position from the current cursor position.
x, y, ok := p.justPressedPosition()
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if !ok {
return nil
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}
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bx, by, bw, bh := playerBarRect()
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const padding = 4
if y < by-padding || by+bh+padding <= y {
return nil
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}
if x < bx || bx+bw <= x {
return nil
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}
pos := time.Duration(x-bx) * p.total / time.Duration(bw)
p.current = pos
if err := p.audioPlayer.SetPosition(pos); err != nil {
return err
}
return nil
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}
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func (p *Player) draw(screen *ebiten.Image) {
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// Draw the bar.
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x, y, w, h := playerBarRect()
vector.DrawFilledRect(screen, float32(x), float32(y), float32(w), float32(h), playerBarColor, true)
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// Draw the cursor on the bar.
c := p.current
cx := float32(x) + float32(w)*float32(p.current)/float32(p.total)
cy := float32(y) + float32(h)/2
vector.DrawFilledCircle(screen, cx, cy, 12, playerCurrentColor, true)
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// Compose the curren time text.
m := (c / time.Minute) % 100
s := (c / time.Second) % 60
currentTimeStr := fmt.Sprintf("%02d:%02d", m, s)
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// Draw buttons
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(p.playButtonPosition.X), float64(p.playButtonPosition.Y))
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if p.audioPlayer.IsPlaying() {
screen.DrawImage(pauseButtonImage, op)
} else {
screen.DrawImage(playButtonImage, op)
}
op.GeoM.Reset()
op.GeoM.Translate(float64(p.alertButtonPosition.X), float64(p.alertButtonPosition.Y))
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screen.DrawImage(alertButtonImage, op)
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// Draw the debug message.
msg := fmt.Sprintf(`TPS: %0.2f
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Press S to toggle Play/Pause
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Press P to play SE
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Press Z or X to change volume of the music
Press U to switch the runnable-on-unfocused state
Press A to switch Ogg and MP3 (Current: %s)
Current Time: %s
Current Volume: %d/128
Type: %s`, ebiten.ActualTPS(), p.musicType,
currentTimeStr, int(p.audioPlayer.Volume()*128), p.musicType)
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ebitenutil.DebugPrint(screen, msg)
}
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type Game struct {
musicPlayer *Player
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musicPlayerCh chan *Player
errCh chan error
justPressedTouchIDs []ebiten.TouchID
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}
func NewGame() (*Game, error) {
audioContext := audio.NewContext(sampleRate)
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g := &Game{
musicPlayerCh: make(chan *Player),
errCh: make(chan error),
}
m, err := NewPlayer(g, audioContext, typeOgg)
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if err != nil {
return nil, err
}
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g.musicPlayer = m
return g, nil
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}
func (g *Game) Update() error {
select {
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case p := <-g.musicPlayerCh:
g.musicPlayer = p
case err := <-g.errCh:
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return err
default:
}
g.justPressedTouchIDs = inpututil.AppendJustPressedTouchIDs(g.justPressedTouchIDs[:0])
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if g.musicPlayer != nil && inpututil.IsKeyJustPressed(ebiten.KeyA) {
var t musicType
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switch g.musicPlayer.musicType {
case typeOgg:
t = typeMP3
case typeMP3:
t = typeOgg
default:
panic("not reached")
}
if err := g.musicPlayer.Close(); err != nil {
return err
}
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g.musicPlayer = nil
go func() {
p, err := NewPlayer(g, audio.CurrentContext(), t)
if err != nil {
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g.errCh <- err
return
}
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g.musicPlayerCh <- p
}()
}
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if g.musicPlayer != nil {
if err := g.musicPlayer.update(); err != nil {
return err
}
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}
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return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
if g.musicPlayer != nil {
g.musicPlayer.draw(screen)
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}
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func main() {
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Audio (Ebitengine Demo)")
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g, err := NewGame()
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if err != nil {
log.Fatal(err)
}
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if err := ebiten.RunGame(g); err != nil {
log.Fatal(err)
}
}