Merge pull request phaserjs#912 from j0hnskot/onDecoded-patch

Fix for bug phaserjs#906

Author: photonstorm

src/sound/Sound.js

@@ -290,7 +290,12 @@ Phaser.Sound = function (game, key, volume, loop, connect) {
     * @private
     */
     this._paused = false;
-
+    
+    /**
+    * @property {boolean} _onDecodedEventDispatched - Was the onDecoded event dispatched?
+    * @private
+    */
+    this._onDecodedEventDispatched = false;
 };
 
 Phaser.Sound.prototype = {
@@ -357,6 +362,13 @@ Phaser.Sound.prototype = {
     * @protected
     */
     update: function () {
+        
+        if (this.isDecoded && !this._onDecodedEventDispatched) {
+
+            this.onDecoded.dispatch(this);
+            this._onDecodedEventDispatched=true;
+
+        }
 
         if (this.pendingPlayback && this.game.cache.isSoundReady(this.key))
         {