audio: Remove Init

init.go

@@ -15,7 +15,6 @@
 package ebiten
 
 import (
-	"github.com/hajimehoshi/ebiten/internal/audio"
 	"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
 	"github.com/hajimehoshi/ebiten/internal/ui"
 )
@@ -27,5 +26,4 @@ func init() {
 	ui.ExecOnUIThread(func() {
 		glContext = opengl.NewContext()
 	})
-	audio.Init()
 }

internal/audio/audio.go

@@ -18,10 +18,6 @@ import (
 	"io"
 )
 
-func Init() {
-	initialize()
-}
-
 func Play(src io.ReadSeeker, sampleRate int) error {
 	return play(src, sampleRate)
 }

internal/audio/audio_js.go

@@ -17,6 +17,7 @@
 package audio
 
 import (
+	"errors"
 	"io"
 	"io/ioutil"
 
@@ -70,6 +71,11 @@ func (a *audioProcessor) play() error {
 }
 
 func play(src io.ReadSeeker, sampleRate int) error {
+	if context == nil {
+		if !initialize() {
+			return errors.New("audio couldn't be initialized")
+		}
+	}
 	a := &audioProcessor{
 		src:        src,
 		sampleRate: sampleRate,
@@ -78,10 +84,10 @@ func play(src io.ReadSeeker, sampleRate int) error {
 	return a.play()
 }
 
-func initialize() {
+func initialize() bool {
 	// Do nothing in node.js.
 	if js.Global.Get("require") != js.Undefined {
-		return
+		return false
 	}
 
 	class := js.Global.Get("AudioContext")
@@ -89,7 +95,8 @@ func initialize() {
 		class = js.Global.Get("webkitAudioContext")
 	}
 	if class == js.Undefined {
-		return
+		return false
 	}
 	context = class.New()
+	return true
 }

internal/audio/audio_openal.go

@@ -18,13 +18,10 @@ package audio
 
 import (
 	"io"
-	"time"
 
 	"golang.org/x/mobile/exp/audio"
 )
 
-var players = map[*audio.Player]struct{}{}
-
 type readSeekCloser struct {
 	io.ReadSeeker
 }
@@ -40,24 +37,7 @@ func play(src io.ReadSeeker, sampleRate int) error {
 	if err != nil {
 		return err
 	}
-	players[p] = struct{}{}
 	return p.Play()
 }
 
-func initialize() {
+// TODO: Implement Close method
-	go func() {
-		for {
-			deleted := []*audio.Player{}
-			for p, _ := range players {
-				if p.State() == audio.Stopped {
-					p.Close()
-					deleted = append(deleted, p)
-				}
-			}
-			for _, p := range deleted {
-				delete(players, p)
-			}
-			time.Sleep(1 * time.Millisecond)
-		}
-	}()
-}