render relabi wave to canvas

1 files changed, 34 insertions, 24 deletions

diff --git a/src/lib/startAudioContext.js b/src/lib/startAudioContext.js
index 5a339a2..54bbe71 100644
--- a/src/lib/startAudioContext.js
+++ b/src/lib/startAudioContext.js
@@ -5,6 +5,8 @@
  *  @copyright 2016 Yotam Mann
  */
 
+window.__audio_context_started = false;
+
 (function (root, factory) {
   if (typeof define === "function" && define.amd) {
     define([], factory);
@@ -90,8 +92,9 @@
    */
   StartAudioContext.isStarted = function () {
     return (
-      StartAudioContext.context !== null &&
-      StartAudioContext.context.state === "running"
+      (StartAudioContext.context !== null &&
+        StartAudioContext.context.state === "running") ||
+      window.__audio_context_started
     );
   };
 
@@ -148,31 +151,38 @@
    * event has been triggered.
    */
   function onTap() {
-    //start the audio context with a silent oscillator
-    if (StartAudioContext.context && !StartAudioContext.isStarted()) {
-      var osc = StartAudioContext.context.createOscillator();
-      var silent = StartAudioContext.context.createGain();
-      silent.gain.value = 0;
-      osc.connect(silent);
-      silent.connect(StartAudioContext.context.destination);
-      var now = StartAudioContext.context.currentTime;
-      osc.start(now);
-      osc.stop(now + 0.5);
-    }
+    try {
+      //start the audio context with a silent oscillator
+      if (StartAudioContext.context && !StartAudioContext.isStarted()) {
+        var osc = StartAudioContext.context.createOscillator();
+        var silent = StartAudioContext.context.createGain();
+        silent.gain.value = 0;
+        osc.connect(silent);
+        silent.connect(StartAudioContext.context.destination);
+        var now = StartAudioContext.context.currentTime;
+        osc.start(now);
+        osc.stop(now + 0.5);
+      }
 
-    //dispose all the tap listeners
-    if (StartAudioContext._tapListeners) {
-      for (var i = 0; i < StartAudioContext._tapListeners.length; i++) {
-        StartAudioContext._tapListeners[i].dispose();
+      //dispose all the tap listeners
+      if (StartAudioContext._tapListeners) {
+        for (var i = 0; i < StartAudioContext._tapListeners.length; i++) {
+          StartAudioContext._tapListeners[i].dispose();
+        }
+        StartAudioContext._tapListeners = null;
       }
-      StartAudioContext._tapListeners = null;
-    }
-    //the onstarted callbacks
-    if (StartAudioContext._onStarted) {
-      for (var j = 0; j < StartAudioContext._onStarted.length; j++) {
-        StartAudioContext._onStarted[j]();
+
+      //the onstarted callbacks
+      if (StartAudioContext._onStarted) {
+        for (var j = 0; j < StartAudioContext._onStarted.length; j++) {
+          StartAudioContext._onStarted[j]();
+        }
+        StartAudioContext._onStarted = null;
       }
-      StartAudioContext._onStarted = null;
+
+      window.__audio_context_started = true;
+    } catch (error) {
+      //
     }
   }