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.
package main
import (
"fmt"
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"image/color"
"log"
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"time"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/exp/audio"
"github.com/hajimehoshi/ebiten/exp/audio/vorbis"
)
const (
screenWidth = 320
screenHeight = 240
)
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var (
playerBarImage *ebiten.Image
playerCurrentImage *ebiten.Image
)
func init() {
var err error
playerBarImage, err = ebiten.NewImage(300, 4, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
playerBarImage.Fill(&color.RGBA{0x80, 0x80, 0x80, 0xff})
playerCurrentImage, err = ebiten.NewImage(4, 10, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
playerCurrentImage.Fill(&color.RGBA{0xff, 0xff, 0xff, 0xff})
}
type Player struct {
audioPlayer *audio.Player
total time.Duration
}
var (
audioContext *audio.Context
player *Player
playerCh = make(chan *Player)
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mouseButtonState = map[ebiten.MouseButton]int{}
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keyState = map[ebiten.Key]int{}
)
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func playerBarRect() (x, y, w, h int) {
w, h = playerBarImage.Size()
x = (screenWidth - w) / 2
y = screenHeight - h - 16
return
}
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func (p *Player) updatePlayPause() error {
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()
}
func (p *Player) updateBar() error {
if p.audioPlayer == nil {
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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()
if y < by || by+bh <= 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 update(screen *ebiten.Image) error {
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audioContext.Update()
if player == nil {
select {
case player = <-playerCh:
default:
}
}
if player != nil {
if err := player.updateBar(); err != nil {
return err
}
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if err := player.updatePlayPause(); err != nil {
return err
}
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}
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op := &ebiten.DrawImageOptions{}
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x, y, w, h := playerBarRect()
op.GeoM.Translate(float64(x), float64(y))
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screen.DrawImage(playerBarImage, op)
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currentTimeStr := "00:00"
if player != nil {
c := player.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)
// Bar
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cw, ch := playerCurrentImage.Size()
cx := int(time.Duration(w)*c/player.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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%s`, ebiten.CurrentFPS(), currentTimeStr)
if player == nil {
msg += "\nNow Loading..."
}
ebitenutil.DebugPrint(screen, msg)
return nil
}
func main() {
// Use a FLAC file so far: I couldn't find any good OGG/Vorbis decoder in pure Go.
f, err := ebitenutil.OpenFile("_resources/audio/ragtime.ogg")
if err != nil {
log.Fatal(err)
}
// TODO: sampleRate should be obtained from the ogg file.
audioContext = audio.NewContext(22050)
// TODO: This doesn't work synchronously on browsers because of decoding. Fix this.
go func() {
s, err := vorbis.Decode(audioContext, f)
if err != nil {
log.Fatal(err)
return
}
p, err := audioContext.NewPlayer(s)
if err != nil {
log.Fatal(err)
return
}
playerCh <- &Player{
audioPlayer: p,
total: s.Len(),
}
close(playerCh)
p.Play()
}()
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Audio (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
}