How to detect if microphone permissions have been granted in chrome

Question

I would liked to detect whether or not microphone permissions have been granted on my site when it loads without actually running something like the following:

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Answer 1

you already got the polling method for checking permissions. here is some information from MDN: https://developer.mozilla.org/en-US/docs/Web/API/Navigator.getUserMedia

and some more: https://developer.mozilla.org/en-US/docs/WebRTC

here is an example:

navigator.getMedia (
// constraints
   {
      video: true,
      audio: true
   },

   // successCallback
   function(localMediaStream) {
      var video = document.querySelector('video');
      video.src = window.URL.createObjectURL(localMediaStream);
      video.onloadedmetadata = function(e) {
         // Do something with the video here.
      };
   },

   // errorCallback
   function(err) {
    console.log("The following error occured: " + err);
   }

);