Calculating correct value for when parameter for loop buffer source start method

Author: pavle-goloskokovic

v3/src/sound/webaudio/WebAudioSound.js

@@ -353,7 +353,14 @@ Object.defineProperty(WebAudioSound.prototype, 'loop', {
         this.currentConfig.loop = value;
         if(this.isPlaying) {
             if(value) {
-                var when = 0;
+                var lastRateUpdateCurrentTime = 0;
+                for (var i = 0; i < this.rateUpdates.length - 1; i++) {
+                    lastRateUpdateCurrentTime +=
+                        (this.rateUpdates[i + 1].time - this.rateUpdates[i].time) * this.rateUpdates[i].rate;
+                }
+                var lastRateUpdate = this.rateUpdates[this.rateUpdates.length - 1];
+                var when = this.playTime + lastRateUpdate.time
+                    + (this.duration - lastRateUpdateCurrentTime) / lastRateUpdate.rate;
                 var offset = this.currentMarker ? this.currentMarker.start : 0;
                 var duration = this.duration;
                 this.loopSource = this.createBufferSource();