mirror of
https://github.com/hajimehoshi/ebiten.git
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328 lines
8.1 KiB
HTML
328 lines
8.1 KiB
HTML
<!DOCTYPE html>
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<!--
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Copyright 2014 Hajime Hoshi
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - audio</title>
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<style>
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body {
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font-family: sans-serif;
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}
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iframe {
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border-color: #999;
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border-style: solid;
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border-width: 1px;
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overflow: hidden;
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}
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pre {
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background: #eee;
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padding: 1em;
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}
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</style>
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<nav><a href="..">Ebiten</a></nav>
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<h1>Ebiten example - audio</h1>
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<iframe src="audio.content.html" width="640" height="480"></iframe>
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<pre><code>package main
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import (
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"bytes"
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"fmt"
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"image/color"
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"log"
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"time"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/audio"
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"github.com/hajimehoshi/ebiten/audio/vorbis"
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"github.com/hajimehoshi/ebiten/audio/wav"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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playerBarImage *ebiten.Image
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playerCurrentImage *ebiten.Image
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)
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func init() {
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var err error
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playerBarImage, err = ebiten.NewImage(300, 4, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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playerBarImage.Fill(&color.RGBA{0x80, 0x80, 0x80, 0xff})
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playerCurrentImage, err = ebiten.NewImage(4, 10, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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playerCurrentImage.Fill(&color.RGBA{0xff, 0xff, 0xff, 0xff})
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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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}
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var (
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audioContext *audio.Context
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musicPlayer *Player
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seStream *wav.Stream
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sePlayer *audio.Player
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musicCh = make(chan *Player)
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seCh = make(chan *wav.Stream)
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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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)
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func playerBarRect() (x, y, w, h int) {
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w, h = playerBarImage.Size()
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x = (screenWidth - w) / 2
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y = screenHeight - h - 16
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return
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}
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type SEStream struct {
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*bytes.Reader
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}
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func (s *SEStream) Close() error {
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return nil
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}
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func (p *Player) updateSE() error {
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if seStream == nil {
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return nil
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}
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if !ebiten.IsKeyPressed(ebiten.KeyP) {
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keyState[ebiten.KeyP] = 0
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return nil
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}
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keyState[ebiten.KeyP]++
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if keyState[ebiten.KeyP] != 1 {
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return nil
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}
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if sePlayer == nil {
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var err error
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sePlayer, err = audio.NewPlayer(audioContext, seStream)
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if err != nil {
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return err
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}
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}
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if sePlayer.IsPlaying() {
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return nil
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}
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if err := sePlayer.Rewind(); err != nil {
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return err
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}
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return sePlayer.Play()
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}
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func (p *Player) updateVolume() error {
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if p.audioPlayer == nil {
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return nil
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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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if ebiten.IsKeyPressed(ebiten.KeyX) {
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volume128++
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}
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if volume128 < 0 {
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volume128 = 0
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}
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if 128 < volume128 {
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volume128 = 128
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}
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p.audioPlayer.SetVolume(float64(volume128) / 128)
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return nil
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}
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func (p *Player) updatePlayPause() error {
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if p.audioPlayer == nil {
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return nil
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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 nil
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}
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keyState[ebiten.KeyS]++
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if keyState[ebiten.KeyS] != 1 {
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return nil
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}
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if p.audioPlayer.IsPlaying() {
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return p.audioPlayer.Pause()
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}
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return p.audioPlayer.Play()
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}
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func (p *Player) updateBar() error {
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if p.audioPlayer == nil {
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return nil
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}
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if !ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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mouseButtonState[ebiten.MouseButtonLeft] = 0
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return nil
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}
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mouseButtonState[ebiten.MouseButtonLeft]++
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if mouseButtonState[ebiten.MouseButtonLeft] != 1 {
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return nil
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}
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x, y := ebiten.CursorPosition()
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bx, by, bw, bh := playerBarRect()
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const padding = 4
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if y < by-padding || by+bh+padding <= y {
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return nil
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}
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if x < bx || bx+bw <= x {
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return nil
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}
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pos := time.Duration(x-bx) * p.total / time.Duration(bw)
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return p.audioPlayer.Seek(pos)
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}
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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 err := audioContext.Update(); err != nil {
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return err
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}
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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 seStream == nil {
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select {
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case seStream = <-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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if err := musicPlayer.updateBar(); err != nil {
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return err
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}
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if err := musicPlayer.updatePlayPause(); err != nil {
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return err
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}
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if err := musicPlayer.updateSE(); err != nil {
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return err
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}
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if err := musicPlayer.updateVolume(); err != nil {
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return err
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}
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}
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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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// 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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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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}
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ebitenutil.DebugPrint(screen, msg)
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return nil
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}
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func main() {
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wavF, err := ebitenutil.OpenFile("_resources/audio/jab.wav")
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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/ragtime.ogg")
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if err != nil {
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log.Fatal(err)
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}
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const sampleRate = 22050
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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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if err != nil {
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log.Fatal(err)
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}
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go func() {
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s, err := wav.Decode(audioContext, wavF)
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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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seCh <- s
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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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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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if musicPlayer != nil {
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if err := musicPlayer.close(); err != nil {
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log.Fatal(err)
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}
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}
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}
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</code></pre>
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<footer>© 2014 Hajime Hoshi</footer>
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