Stop downloading streaming audio when stopped

This also fixes #1129 where stopping in Chrome a 2nd time wouldn't work due to Chrome not resolving the play promise again.

Author: goldfire

src/howler.core.js

@@ -938,6 +938,12 @@
           }
         };
 
+        // If this is streaming audio, make sure the src is set and load again.
+        if (node.src === 'data:audio/wav;base64,UklGRigAAABXQVZFZm10IBIAAAABAAEARKwAAIhYAQACABAAAABkYXRhAgAAAAEA') {
+          node.src = self._src;
+          node.load();
+        }
+
         // Play immediately if ready, or wait for the 'canplaythrough'e vent.
         var loadedNoReadyState = (window && window.ejecta) || (!node.readyState && Howler._navigator.isCocoonJS);
         if (node.readyState >= 3 || loadedNoReadyState) {
@@ -1088,6 +1094,11 @@
             } else if (!isNaN(sound._node.duration) || sound._node.duration === Infinity) {
               sound._node.currentTime = sound._start || 0;
               sound._node.pause();
+
+              // If this is a live stream, stop download once the audio is stopped.
+              if (sound._node.duration === Infinity) {
+                self._clearSound(sound._node);
+              }
             }
           }
 
@@ -1703,10 +1714,7 @@
         // Remove the source or disconnect.
         if (!self._webAudio) {
           // Set the source to 0-second silence to stop any downloading (except in IE).
-          var checkIE = /MSIE |Trident\//.test(Howler._navigator && Howler._navigator.userAgent);
-          if (!checkIE) {
-            sounds[i]._node.src = 'data:audio/wav;base64,UklGRigAAABXQVZFZm10IBIAAAABAAEARKwAAIhYAQACABAAAABkYXRhAgAAAAEA';
-          }
+          self._clearSound(sounds[i]._node);
 
           // Remove any event listeners.
           sounds[i]._node.removeEventListener('error', sounds[i]._errorFn, false);
@@ -2124,6 +2132,17 @@
       node.bufferSource = null;
 
       return self;
+    },
+
+    /**
+     * Set the source to a 0-second silence to stop any downloading (except in IE).
+     * @param  {Object} node Audio node to clear.
+     */
+    _clearSound: function(node) {
+      var checkIE = /MSIE |Trident\//.test(Howler._navigator && Howler._navigator.userAgent);
+      if (!checkIE) {
+        node.src = 'data:audio/wav;base64,UklGRigAAABXQVZFZm10IBIAAAABAAEARKwAAIhYAQACABAAAABkYXRhAgAAAAEA';
+      }
     }
   };