ebiten/examples/wav/main.go
2022-11-03 12:55:14 +09:00

114 lines
2.8 KiB
Go

// Copyright 2017 The Ebiten Authors
//
// 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.
//go:build example
package main
import (
"bytes"
"log"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/audio"
"github.com/hajimehoshi/ebiten/v2/audio/wav"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
raudio "github.com/hajimehoshi/ebiten/v2/examples/resources/audio"
"github.com/hajimehoshi/ebiten/v2/inpututil"
)
const (
screenWidth = 640
screenHeight = 480
sampleRate = 48000
)
type Game struct {
audioContext *audio.Context
audioPlayer *audio.Player
}
func NewGame() (*Game, error) {
g := &Game{}
var err error
// Initialize audio context.
g.audioContext = audio.NewContext(sampleRate)
// In this example, embedded resource "Jab_wav" is used.
//
// If you want to use a wav file, open this and pass the file stream to wav.Decode.
// Note that file's Close() should not be closed here
// since audio.Player manages stream state.
//
// f, err := os.Open("jab.wav")
// if err != nil {
// return err
// }
//
// d, err := wav.DecodeWithoutResampling(f)
// ...
// Decode wav-formatted data and retrieve decoded PCM stream.
d, err := wav.DecodeWithoutResampling(bytes.NewReader(raudio.Jab_wav))
if err != nil {
return nil, err
}
// Create an audio.Player that has one stream.
g.audioPlayer, err = g.audioContext.NewPlayer(d)
if err != nil {
return nil, err
}
return g, nil
}
func (g *Game) Update() error {
if inpututil.IsKeyJustPressed(ebiten.KeyP) {
// As audioPlayer has one stream and remembers the playing position,
// rewinding is needed before playing when reusing audioPlayer.
if err := g.audioPlayer.Rewind(); err != nil {
return err
}
g.audioPlayer.Play()
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
if g.audioPlayer.IsPlaying() {
ebitenutil.DebugPrint(screen, "Bump!")
} else {
ebitenutil.DebugPrint(screen, "Press P to play the wav")
}
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func main() {
g, err := NewGame()
if err != nil {
log.Fatal(err)
}
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("WAV (Ebitengine Demo)")
if err := ebiten.RunGame(g); err != nil {
log.Fatal(err)
}
}