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.
// +build example
package main
import (
"fmt"
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"image/color"
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"io/ioutil"
"log"
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"time"
"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/audio"
"github.com/hajimehoshi/ebiten/audio/vorbis"
"github.com/hajimehoshi/ebiten/audio/wav"
"github.com/hajimehoshi/ebiten/ebitenutil"
)
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)
}
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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)
}
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if err := playerCurrentImage.Fill(&color.RGBA{0xff, 0xff, 0xff, 0xff}); err != nil {
log.Fatal(err)
}
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}
type Player struct {
audioPlayer *audio.Player
total time.Duration
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seekedCh chan error
}
var (
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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volume128 = 128
)
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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) updateSE() error {
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if seBytes == nil {
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return nil
}
if !ebiten.IsKeyPressed(ebiten.KeyP) {
keyState[ebiten.KeyP] = 0
return nil
}
keyState[ebiten.KeyP]++
if keyState[ebiten.KeyP] != 1 {
return nil
}
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sePlayer, err := audio.NewPlayerFromBytes(audioContext, seBytes)
if err != nil {
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return err
}
return sePlayer.Play()
}
func (p *Player) updateVolume() {
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if p.audioPlayer == nil {
return
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}
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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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() {
if p.audioPlayer == nil {
return
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}
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if p.seekedCh != nil {
return
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}
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if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
mouseButtonState[ebiten.MouseButtonLeft] = 0
return
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}
mouseButtonState[ebiten.MouseButtonLeft]++
if mouseButtonState[ebiten.MouseButtonLeft] != 1 {
return
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}
x, y := ebiten.CursorPosition()
bx, by, bw, bh := playerBarRect()
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const padding = 4
if y < by-padding || by+bh+padding <= y {
return
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}
if x < bx || bx+bw <= x {
return
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}
pos := time.Duration(x-bx) * p.total / time.Duration(bw)
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p.seekedCh = make(chan error, 1)
go func() {
// This can't be done parallely! !?!?
p.seekedCh <- p.audioPlayer.Seek(pos)
}()
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}
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func (p *Player) close() error {
return p.audioPlayer.Close()
}
func update(screen *ebiten.Image) error {
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if musicPlayer == nil {
select {
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case musicPlayer = <-musicCh:
default:
}
}
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if seBytes == nil {
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select {
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case seBytes = <-seCh:
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default:
}
}
if musicPlayer != nil {
musicPlayer.updateBar()
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if err := musicPlayer.updatePlayPause(); err != nil {
return err
}
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if err := musicPlayer.updateSE(); err != nil {
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return err
}
musicPlayer.updateVolume()
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}
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if ebiten.IsRunningSlowly() {
return nil
}
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op := &ebiten.DrawImageOptions{}
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x, y, w, h := playerBarRect()
op.GeoM.Translate(float64(x), float64(y))
screen.DrawImage(playerBarImage, op)
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currentTimeStr := "00:00"
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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)
// 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))
screen.DrawImage(playerCurrentImage, op)
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}
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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 {
msg += "\nNow Loading..."
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} else if musicPlayer.seekedCh != nil {
select {
case err := <-musicPlayer.seekedCh:
if err != nil {
return err
}
close(musicPlayer.seekedCh)
musicPlayer.seekedCh = nil
default:
msg += "\nSeeking..."
}
}
ebitenutil.DebugPrint(screen, msg)
if err := audioContext.Update(); err != nil {
return err
}
return nil
}
func main() {
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wavF, err := ebitenutil.OpenFile("_resources/audio/jab.wav")
if err != nil {
log.Fatal(err)
}
oggF, err := ebitenutil.OpenFile("_resources/audio/game.ogg")
if err != nil {
log.Fatal(err)
}
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// This sample rate doesn't match with wav/ogg's sample rate,
// but decoders adjust them.
const sampleRate = 48000
const bytesPerSample = 4 // TODO: This should be defined in audio package
audioContext, err = audio.NewContext(sampleRate)
if err != nil {
log.Fatal(err)
}
go func() {
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s, err := wav.Decode(audioContext, wavF)
if err != nil {
log.Fatal(err)
return
}
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b, err := ioutil.ReadAll(s)
if err != nil {
log.Fatal(err)
return
}
seCh <- b
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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
}
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musicCh <- &Player{
audioPlayer: p,
total: time.Second * time.Duration(s.Size()) / bytesPerSample / sampleRate,
}
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close(musicCh)
// TODO: Is this goroutine-safe?
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if err := p.Play(); err != nil {
log.Fatal(err)
return
}
}()
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Audio (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
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if musicPlayer != nil {
if err := musicPlayer.close(); err != nil {
log.Fatal(err)
}
}
}