Added ability to notify about available media device list changes

conference.js

                 JitsiMeetJS.isDesktopSharingEnabled();
 
             // update list of available devices
-            if (JitsiMeetJS.isDeviceListAvailable() &&
-                JitsiMeetJS.isDeviceChangeAvailable()) {
-                JitsiMeetJS.enumerateDevices(
-                    devices => APP.UI.onAvailableDevicesChanged(devices)
-                );
+            if (JitsiMeetJS.mediaDevices.isDeviceListAvailable() &&
+                JitsiMeetJS.mediaDevices.isDeviceChangeAvailable()) {
+                JitsiMeetJS.mediaDevices.enumerateDevices(
+                    APP.UI.onAvailableDevicesChanged);
+
+                JitsiMeetJS.mediaDevices.addEventListener(
+                    JitsiMeetJS.events.mediaDevices.DEVICE_LIST_CHANGED,
+                    APP.UI.onAvailableDevicesChanged);
             }
             if (config.iAmRecorder)
                 this.recorder = new Recorder();

modules/UI/side_pannels/settings/SettingsMenu.js

         );
 
         if (audioOutput.length &&
-            JitsiMeetJS.isDeviceChangeAvailable('output')) {
+            JitsiMeetJS.mediaDevices.isDeviceChangeAvailable('output')) {
             $selectAudioOutput.html(
                 generateDevicesOptions(audioOutput,
                     Settings.getAudioOutputDeviceId()));

modules/settings/Settings.js

 
     var audioOutputDeviceId = window.localStorage.audioOutputDeviceId;
 
-    if (typeof audioOutputDeviceId !== 'undefined' &&
-        audioOutputDeviceId !== JitsiMeetJS.getAudioOutputDevice()) {
-        JitsiMeetJS.setAudioOutputDevice(
+    if (typeof audioOutputDeviceId !== 'undefined' && audioOutputDeviceId !==
+            JitsiMeetJS.mediaDevices.getAudioOutputDevice()) {
+        JitsiMeetJS.mediaDevices.setAudioOutputDevice(
             window.localStorage.audioOutputDeviceId).catch((ex) => {
                 console.error('failed to set audio output device from local ' +
                     'storage', ex);
      * @returns {String}
      */
     getAudioOutputDeviceId: function () {
-        return JitsiMeetJS.getAudioOutputDevice();
+        return JitsiMeetJS.mediaDevices.getAudioOutputDevice();
     },
     /**
      * Set device id of the audio output device which is currently in use.
      * @returns {Promise}
      */
     setAudioOutputDeviceId: function (newId = '') {
-        return JitsiMeetJS.setAudioOutputDevice(newId)
+        return JitsiMeetJS.mediaDevices.setAudioOutputDevice(newId)
             .then(() => window.localStorage.audioOutputDeviceId = newId);
     },