add error callback to audioin

Author: therewasaguy

lib/p5.sound.js

@@ -4764,6 +4764,7 @@ var audioin;
 audioin = function () {
   'use strict';
   var p5sound = master;
+  var CustomError = errorHandler;
   /**
    *  <p>Get audio from an input, i.e. your computer's microphone.</p>
    *
@@ -4830,24 +4831,35 @@ audioin = function () {
    *  anything unless you use the connect() method.<br/>
    *
    *  @method start
-   */
-  p5.AudioIn.prototype.start = function () {
+   *  @param {Function} successCallback Name of a function to call on
+   *                                    success.
+   *  @param {Function} errorCallback Name of a function to call if
+   *                                    there was an error. For example,
+   *                                    some browsers do not support
+   *                                    getUserMedia.
+   */
+  p5.AudioIn.prototype.start = function (successCallback, errorCallback) {
     var self = this;
     // if _gotSources() i.e. developers determine which source to use
     if (p5sound.inputSources[self.currentSource]) {
       // set the audio source
       var audioSource = p5sound.inputSources[self.currentSource].id;
       var constraints = { audio: { optional: [{ sourceId: audioSource }] } };
-      navigator.getUserMedia(constraints, this._onStream = function (stream) {
+      window.navigator.getUserMedia(constraints, this._onStream = function (stream) {
         self.stream = stream;
         self.enabled = true;
         // Wrap a MediaStreamSourceNode around the live input
         self.mediaStream = p5sound.audiocontext.createMediaStreamSource(stream);
         self.mediaStream.connect(self.output);
+        if (successCallback)
+          successCallback();
         // only send to the Amplitude reader, so we can see it but not hear it.
         self.amplitude.setInput(self.output);
-      }, this._onStreamError = function (stream) {
-        console.error(stream);
+      }, this._onStreamError = function (e) {
+        if (errorCallback)
+          errorCallback(e);
+        else
+          console.error(e);
       });
     } else {
       // if Firefox where users select their source via browser
@@ -4861,8 +4873,13 @@ audioin = function () {
         self.mediaStream.connect(self.output);
         // only send to the Amplitude reader, so we can see it but not hear it.
         self.amplitude.setInput(self.output);
-      }, this._onStreamError = function (stream) {
-        console.error(stream);
+        if (successCallback)
+          successCallback();
+      }, this._onStreamError = function (e) {
+        if (errorCallback)
+          errorCallback(e);
+        else
+          console.error(e);
       });
     }
   };
@@ -5054,7 +5071,7 @@ audioin = function () {
     this.amplitude = null;
     this.output = null;
   };
-}(master);
+}(master, errorHandler);
 var filter;
 filter = function () {
   'use strict';