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469 lines
10 KiB
Go
469 lines
10 KiB
Go
// Copyright 2016 Hajime Hoshi
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// 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.
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package main
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import (
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"bytes"
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"fmt"
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"image"
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"image/color"
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_ "image/png"
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"io"
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"log"
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"time"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/audio"
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"github.com/hajimehoshi/ebiten/v2/audio/mp3"
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"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
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"github.com/hajimehoshi/ebiten/v2/audio/wav"
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"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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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"
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"github.com/hajimehoshi/ebiten/v2/vector"
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)
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const (
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screenWidth = 640
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screenHeight = 480
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sampleRate = 48000
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)
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var (
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playerBarColor = color.RGBA{0x80, 0x80, 0x80, 0xff}
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playerCurrentColor = color.RGBA{0xff, 0xff, 0xff, 0xff}
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)
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var (
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playButtonImage *ebiten.Image
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pauseButtonImage *ebiten.Image
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alertButtonImage *ebiten.Image
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)
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func init() {
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img, _, err := image.Decode(bytes.NewReader(riaudio.Play_png))
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if err != nil {
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panic(err)
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}
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playButtonImage = ebiten.NewImageFromImage(img)
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img, _, err = image.Decode(bytes.NewReader(riaudio.Pause_png))
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if err != nil {
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panic(err)
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}
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pauseButtonImage = ebiten.NewImageFromImage(img)
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img, _, err = image.Decode(bytes.NewReader(riaudio.Alert_png))
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if err != nil {
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panic(err)
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}
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alertButtonImage = ebiten.NewImageFromImage(img)
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}
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type musicType int
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const (
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typeOgg musicType = iota
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typeMP3
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)
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func (t musicType) String() string {
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switch t {
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case typeOgg:
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return "Ogg"
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case typeMP3:
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return "MP3"
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default:
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panic("not reached")
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}
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}
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// Player represents the current audio state.
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type Player struct {
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game *Game
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audioContext *audio.Context
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audioPlayer *audio.Player
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current time.Duration
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total time.Duration
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seBytes []byte
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seCh chan []byte
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volume128 int
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musicType musicType
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playButtonPosition image.Point
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alertButtonPosition image.Point
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}
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func playerBarRect() (x, y, w, h int) {
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w, h = 600, 8
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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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func NewPlayer(game *Game, audioContext *audio.Context, musicType musicType) (*Player, error) {
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type audioStream interface {
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io.ReadSeeker
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Length() int64
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}
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const bytesPerSample = 4 // TODO: This should be defined in audio package
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var s audioStream
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switch musicType {
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case typeOgg:
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var err error
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s, err = vorbis.DecodeWithoutResampling(bytes.NewReader(raudio.Ragtime_ogg))
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if err != nil {
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return nil, err
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}
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case typeMP3:
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var err error
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s, err = mp3.DecodeWithoutResampling(bytes.NewReader(raudio.Ragtime_mp3))
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if err != nil {
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return nil, err
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}
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default:
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panic("not reached")
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}
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p, err := audioContext.NewPlayer(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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game: game,
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audioContext: audioContext,
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audioPlayer: p,
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total: time.Second * time.Duration(s.Length()) / bytesPerSample / sampleRate,
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volume128: 128,
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seCh: make(chan []byte),
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musicType: musicType,
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}
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if player.total == 0 {
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player.total = 1
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}
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const buttonPadding = 16
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w := playButtonImage.Bounds().Dx()
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player.playButtonPosition.X = (screenWidth - w*2 + buttonPadding*1) / 2
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player.playButtonPosition.Y = screenHeight - 160
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player.alertButtonPosition.X = player.playButtonPosition.X + w + buttonPadding
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player.alertButtonPosition.Y = player.playButtonPosition.Y
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player.audioPlayer.Play()
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go func() {
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s, err := wav.DecodeWithSampleRate(sampleRate, bytes.NewReader(raudio.Jab_wav))
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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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b, err := io.ReadAll(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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player.seCh <- b
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}()
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return player, nil
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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 (p *Player) update() error {
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select {
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case p.seBytes = <-p.seCh:
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close(p.seCh)
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p.seCh = nil
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default:
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}
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if p.audioPlayer.IsPlaying() {
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p.current = p.audioPlayer.Position()
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}
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if err := p.seekBarIfNeeded(); err != nil {
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return err
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}
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p.switchPlayStateIfNeeded()
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p.playSEIfNeeded()
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p.updateVolumeIfNeeded()
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if inpututil.IsKeyJustPressed(ebiten.KeyU) {
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b := ebiten.IsRunnableOnUnfocused()
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ebiten.SetRunnableOnUnfocused(!b)
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}
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return nil
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}
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func (p *Player) shouldPlaySE() bool {
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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) {
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return true
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}
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r := image.Rectangle{
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Min: p.alertButtonPosition,
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Max: p.alertButtonPosition.Add(alertButtonImage.Bounds().Size()),
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}
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if image.Pt(ebiten.CursorPosition()).In(r) {
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if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
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return true
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}
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}
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for _, id := range p.game.justPressedTouchIDs {
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if image.Pt(ebiten.TouchPosition(id)).In(r) {
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return true
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}
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}
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return false
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}
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func (p *Player) playSEIfNeeded() {
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if !p.shouldPlaySE() {
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return
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}
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sePlayer := p.audioContext.NewPlayerFromBytes(p.seBytes)
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sePlayer.Play()
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}
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func (p *Player) updateVolumeIfNeeded() {
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if ebiten.IsKeyPressed(ebiten.KeyZ) {
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p.volume128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyX) {
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p.volume128++
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}
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if p.volume128 < 0 {
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p.volume128 = 0
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}
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if 128 < p.volume128 {
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p.volume128 = 128
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}
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p.audioPlayer.SetVolume(float64(p.volume128) / 128)
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}
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func (p *Player) shouldSwitchPlayStateIfNeeded() bool {
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if inpututil.IsKeyJustPressed(ebiten.KeyS) {
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return true
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}
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r := image.Rectangle{
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Min: p.playButtonPosition,
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Max: p.playButtonPosition.Add(playButtonImage.Bounds().Size()),
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}
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if image.Pt(ebiten.CursorPosition()).In(r) {
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if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
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return true
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}
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}
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for _, id := range p.game.justPressedTouchIDs {
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if image.Pt(ebiten.TouchPosition(id)).In(r) {
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return true
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}
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}
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return false
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}
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func (p *Player) switchPlayStateIfNeeded() {
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if !p.shouldSwitchPlayStateIfNeeded() {
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return
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}
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if p.audioPlayer.IsPlaying() {
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p.audioPlayer.Pause()
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return
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}
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p.audioPlayer.Play()
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}
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func (p *Player) justPressedPosition() (int, int, bool) {
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if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
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x, y := ebiten.CursorPosition()
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return x, y, true
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}
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if len(p.game.justPressedTouchIDs) > 0 {
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x, y := ebiten.TouchPosition(p.game.justPressedTouchIDs[0])
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return x, y, true
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}
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return 0, 0, false
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}
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func (p *Player) seekBarIfNeeded() error {
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// Calculate the next seeking position from the current cursor position.
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x, y, ok := p.justPressedPosition()
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if !ok {
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return nil
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}
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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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p.current = pos
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if err := p.audioPlayer.SetPosition(pos); err != nil {
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return err
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}
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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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// Draw the bar.
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x, y, w, h := playerBarRect()
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vector.DrawFilledRect(screen, float32(x), float32(y), float32(w), float32(h), playerBarColor, true)
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// Draw the cursor on the bar.
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c := p.current
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cx := float32(x) + float32(w)*float32(p.current)/float32(p.total)
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cy := float32(y) + float32(h)/2
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vector.DrawFilledCircle(screen, cx, cy, 12, playerCurrentColor, true)
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// Compose the curren time text.
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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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// Draw buttons
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(p.playButtonPosition.X), float64(p.playButtonPosition.Y))
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if p.audioPlayer.IsPlaying() {
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screen.DrawImage(pauseButtonImage, op)
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} else {
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screen.DrawImage(playButtonImage, op)
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}
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op.GeoM.Reset()
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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.
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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
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Press U to switch the runnable-on-unfocused state
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Press A to switch Ogg and MP3 (Current: %s)
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Current Time: %s
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Current Volume: %d/128
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Type: %s`, ebiten.ActualTPS(), p.musicType,
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currentTimeStr, int(p.audioPlayer.Volume()*128), p.musicType)
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ebitenutil.DebugPrint(screen, msg)
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}
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type Game struct {
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musicPlayer *Player
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musicPlayerCh chan *Player
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errCh chan error
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justPressedTouchIDs []ebiten.TouchID
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}
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func NewGame() (*Game, error) {
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audioContext := audio.NewContext(sampleRate)
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g := &Game{
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musicPlayerCh: make(chan *Player),
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errCh: make(chan error),
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}
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m, err := NewPlayer(g, audioContext, typeOgg)
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if err != nil {
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return nil, err
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}
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g.musicPlayer = m
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return g, nil
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}
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func (g *Game) Update() error {
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select {
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case p := <-g.musicPlayerCh:
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g.musicPlayer = p
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case err := <-g.errCh:
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return err
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default:
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}
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g.justPressedTouchIDs = inpututil.AppendJustPressedTouchIDs(g.justPressedTouchIDs[:0])
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if g.musicPlayer != nil && inpututil.IsKeyJustPressed(ebiten.KeyA) {
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var t musicType
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switch g.musicPlayer.musicType {
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case typeOgg:
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t = typeMP3
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case typeMP3:
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t = typeOgg
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default:
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panic("not reached")
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}
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if err := g.musicPlayer.Close(); err != nil {
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return err
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}
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g.musicPlayer = nil
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go func() {
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p, err := NewPlayer(g, audio.CurrentContext(), t)
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if err != nil {
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g.errCh <- err
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return
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}
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g.musicPlayerCh <- p
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}()
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}
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if g.musicPlayer != nil {
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if err := g.musicPlayer.update(); err != nil {
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return err
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}
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}
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return nil
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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if g.musicPlayer != nil {
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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) {
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return screenWidth, screenHeight
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}
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func main() {
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ebiten.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("Audio (Ebitengine Demo)")
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g, err := NewGame()
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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.RunGame(g); err != nil {
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log.Fatal(err)
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}
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}
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