GUAC-882: Wrap calls to new Audio() within try/catch.

guacamole-common-js/src/main/webapp/modules/AudioChannel.js

@@ -121,7 +121,7 @@ Guacamole.AudioChannel.Packet = function(mimetype, data) {
      * @param {Number} when The time this packet should be played, in
      *                      milliseconds.
      */
-    this.play = undefined; // Defined conditionally depending on support
+    this.play = function(when) { /* NOP */ }; // Defined conditionally depending on support
 
     // If audio API available, use it.
     if (Guacamole.AudioChannel.context) {
@@ -181,7 +181,11 @@ Guacamole.AudioChannel.Packet = function(mimetype, data) {
         var play_on_load = false;
 
         // Create audio element to house and play the data
-        var audio = new Audio();
+        var audio = null;
+        try { audio = new Audio(); }
+        catch (e) {}
+
+        if (audio) {
 
             // Read data and start decoding
             var reader = new FileReader();
@@ -235,4 +239,6 @@ Guacamole.AudioChannel.Packet = function(mimetype, data) {
 
         }
 
+    }
+
 };

guacamole/src/main/webapp/scripts/guac-ui.js

@@ -187,7 +187,18 @@ GuacUI.Audio = new (function() {
     // Build array of supported audio formats
     codecs.forEach(function(mimetype) {
 
-        var audio = new Audio();
+        // Attempt to get audio element for mimetype testing
+        var audio = null;
+        try {
+            audio = new Audio();
+        }
+        catch (e) {
+
+            // Skip testing if audio is not available
+            return;
+
+        }
+
         var support_level = audio.canPlayType(mimetype);
 
         // Trim semicolon and trailer