From 29fd88db307d8f322ff4bd52ca578f8d1cb96203 Mon Sep 17 00:00:00 2001
From: agamemnus <agamemnus@users.noreply.github.com>
Date: Sun, 11 Jun 2017 12:47:41 -0400
Subject: [PATCH] requestAnimationFrame should be bound on window... (#1120)

Apparently...

https://stackoverflow.com/questions/10743596/why-are-certain-function-calls-termed-illegal-invocations-in-javascript
---
 src/util.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util.js b/src/util.js
index d228b3893..faf326fe6 100644
--- a/src/util.js
+++ b/src/util.js
@@ -7,7 +7,7 @@ WaveSurfer.util = {
         window.oRequestAnimationFrame ||
         window.msRequestAnimationFrame ||
         function (callback, element) { setTimeout(callback, 1000 / 60); }
-    ),
+    ).bind(window),
 
     frame: function (func) {
         return function () {