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examples/audio: Refactoring (#302)
This commit is contained in:
Hajime Hoshi
parent
ad1f1263f7
commit
5ad5b2a8b8
@ -33,6 +33,10 @@ import (
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const (
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screenWidth = 320
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screenHeight = 240
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// This sample rate doesn't match with wav/ogg's sample rate,
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// but decoders adjust them.
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sampleRate = 48000
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)
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var (
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@ -49,16 +53,15 @@ func init() {
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}
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type Player struct {
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audioPlayer *audio.Player
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total time.Duration
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seekedCh chan error
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audioContext *audio.Context
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audioPlayer *audio.Player
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total time.Duration
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seekedCh chan error
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}
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var (
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audioContext *audio.Context
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musicPlayer *Player
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seBytes []byte
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musicCh = make(chan *Player)
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seCh = make(chan []byte)
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mouseButtonState = map[ebiten.MouseButton]int{}
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keyState = map[ebiten.Key]int{}
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@ -72,6 +75,49 @@ func playerBarRect() (x, y, w, h int) {
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return
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}
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func NewPlayer(audioContext *audio.Context) (*Player, error) {
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const bytesPerSample = 4 // TODO: This should be defined in audio package
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oggF, err := ebitenutil.OpenFile("_resources/audio/game.ogg")
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if err != nil {
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return nil, err
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}
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s, err := vorbis.Decode(audioContext, oggF)
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if err != nil {
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return nil, err
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}
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p, err := audio.NewPlayer(audioContext, s)
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if err != nil {
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return nil, err
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}
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player := &Player{
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audioContext: audioContext,
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audioPlayer: p,
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total: time.Second * time.Duration(s.Size()) / bytesPerSample / sampleRate,
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}
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player.audioPlayer.Play()
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return player, nil
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}
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func (p *Player) update() error {
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p.updateBar()
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p.updatePlayPause()
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p.updateSE()
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p.updateVolume()
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if err := p.audioContext.Update(); err != nil {
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return err
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}
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select {
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case err := <-p.seekedCh:
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if err != nil {
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return err
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}
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close(p.seekedCh)
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p.seekedCh = nil
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default:
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}
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return nil
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}
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func (p *Player) updateSE() {
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if seBytes == nil {
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return
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@ -84,14 +130,11 @@ func (p *Player) updateSE() {
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if keyState[ebiten.KeyP] != 1 {
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return
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}
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sePlayer, _ := audio.NewPlayerFromBytes(audioContext, seBytes)
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sePlayer, _ := audio.NewPlayerFromBytes(p.audioContext, seBytes)
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sePlayer.Play()
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}
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func (p *Player) updateVolume() {
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if p.audioPlayer == nil {
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return
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}
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if ebiten.IsKeyPressed(ebiten.KeyZ) {
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volume128--
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}
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@ -108,9 +151,6 @@ func (p *Player) updateVolume() {
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}
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func (p *Player) updatePlayPause() {
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if p.audioPlayer == nil {
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return
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}
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if !ebiten.IsKeyPressed(ebiten.KeyS) {
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keyState[ebiten.KeyS] = 0
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return
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@ -124,13 +164,9 @@ func (p *Player) updatePlayPause() {
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return
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}
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p.audioPlayer.Play()
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return
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}
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func (p *Player) updateBar() {
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if p.audioPlayer == nil {
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return
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}
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if p.seekedCh != nil {
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return
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}
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@ -163,73 +199,52 @@ func (p *Player) close() error {
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return p.audioPlayer.Close()
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}
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func update(screen *ebiten.Image) error {
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if musicPlayer == nil {
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select {
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case musicPlayer = <-musicCh:
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default:
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}
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}
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if seBytes == nil {
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select {
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case seBytes = <-seCh:
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default:
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}
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}
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if musicPlayer != nil {
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musicPlayer.updateBar()
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musicPlayer.updatePlayPause()
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musicPlayer.updateSE()
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musicPlayer.updateVolume()
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}
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if err := audioContext.Update(); err != nil {
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return err
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}
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if ebiten.IsRunningSlowly() {
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return nil
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}
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func (p *Player) draw(screen *ebiten.Image) {
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op := &ebiten.DrawImageOptions{}
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x, y, w, h := playerBarRect()
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op.GeoM.Translate(float64(x), float64(y))
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screen.DrawImage(playerBarImage, op)
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currentTimeStr := "00:00"
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if musicPlayer != nil {
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c := musicPlayer.audioPlayer.Current()
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c := p.audioPlayer.Current()
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// Current Time
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m := (c / time.Minute) % 100
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s := (c / time.Second) % 60
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currentTimeStr = fmt.Sprintf("%02d:%02d", m, s)
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// Current Time
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m := (c / time.Minute) % 100
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s := (c / time.Second) % 60
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currentTimeStr = fmt.Sprintf("%02d:%02d", m, s)
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// Bar
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cw, ch := playerCurrentImage.Size()
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cx := int(time.Duration(w)*c/musicPlayer.total) + x - cw/2
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cy := y - (ch-h)/2
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(cx), float64(cy))
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screen.DrawImage(playerCurrentImage, op)
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}
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// Bar
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cw, ch := playerCurrentImage.Size()
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cx := int(time.Duration(w)*c/p.total) + x - cw/2
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cy := y - (ch-h)/2
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op = &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(cx), float64(cy))
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screen.DrawImage(playerCurrentImage, op)
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msg := fmt.Sprintf(`FPS: %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
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%s`, ebiten.CurrentFPS(), currentTimeStr)
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if musicPlayer == nil {
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msg += "\nNow Loading..."
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} else if musicPlayer.seekedCh != nil {
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select {
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case err := <-musicPlayer.seekedCh:
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if err != nil {
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return err
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}
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close(musicPlayer.seekedCh)
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musicPlayer.seekedCh = nil
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default:
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msg += "\nSeeking..."
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}
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if p.seekedCh != nil {
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msg += "\nSeeking..."
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}
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ebitenutil.DebugPrint(screen, msg)
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}
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func update(screen *ebiten.Image) error {
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if seBytes == nil {
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select {
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case seBytes = <-seCh:
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default:
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}
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}
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if err := musicPlayer.update(); err != nil {
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return err
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}
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if ebiten.IsRunningSlowly() {
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return nil
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}
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musicPlayer.draw(screen)
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return nil
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}
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@ -238,15 +253,7 @@ func main() {
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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/game.ogg")
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if err != nil {
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log.Fatal(err)
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}
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// This sample rate doesn't match with wav/ogg's sample rate,
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// but decoders adjust them.
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const sampleRate = 48000
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const bytesPerSample = 4 // TODO: This should be defined in audio package
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audioContext, err = audio.NewContext(sampleRate)
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audioContext, err := audio.NewContext(sampleRate)
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if err != nil {
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log.Fatal(err)
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}
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@ -264,25 +271,10 @@ func main() {
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seCh <- b
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close(seCh)
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}()
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go func() {
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s, err := vorbis.Decode(audioContext, oggF)
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if err != nil {
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log.Fatal(err)
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return
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}
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p, err := audio.NewPlayer(audioContext, s)
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if err != nil {
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log.Fatal(err)
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return
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}
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musicCh <- &Player{
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audioPlayer: p,
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total: time.Second * time.Duration(s.Size()) / bytesPerSample / sampleRate,
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}
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close(musicCh)
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// TODO: Is this goroutine-safe?
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p.Play()
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}()
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musicPlayer, err = NewPlayer(audioContext)
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if err != nil {
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log.Fatal(err)
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Audio (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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