Merge pull request #435 from virtuacoplenny/device-picker

New methods to check mutiple mic support and local stats collecting

JitsiMediaDevices.js

 import * as JitsiMediaDevicesEvents from './JitsiMediaDevicesEvents';
 import * as MediaType from './service/RTC/MediaType';
 import RTC from './modules/RTC/RTC';
+import RTCBrowserType from './modules/RTC/RTCBrowserType';
 import RTCEvents from './service/RTC/RTCEvents';
 import Statistics from './modules/statistics/statistics';
 
         }
     },
 
+    /**
+     * Returns true if it is possible to be simultaneously capturing audio
+     * from more than one device.
+     *
+     * @returns {boolean}
+     */
+    isMultipleAudioInputSupported() {
+        return !RTCBrowserType.isFirefox();
+    },
+
     /**
      * Returns currently used audio output device id, 'default' stands
      * for default device

JitsiMeetJS.js

 import JitsiTrackError from './JitsiTrackError';
 import * as JitsiTrackErrors from './JitsiTrackErrors';
 import * as JitsiTrackEvents from './JitsiTrackEvents';
+import LocalStatsCollector from './modules/statistics/LocalStatsCollector';
 import Logger from 'jitsi-meet-logger';
 import * as MediaType from './service/RTC/MediaType';
 import Resolutions from './service/RTC/Resolutions';
         return this.mediaDevices.isDeviceChangeAvailable(deviceType);
     },
 
+
+    /**
+     * Checks if the current environment supports having multiple audio
+     * input devices in use simultaneously.
+     *
+     * @returns {boolean} True if multiple audio input devices can be used.
+     */
+    isMultipleAudioInputSupported() {
+        return this.mediaDevices.isMultipleAudioInputSupported();
+    },
+
+    /**
+     * Checks if local tracks can collect stats and collection is enabled.
+     *
+     * @param {boolean} True if stats are being collected for local tracks.
+     */
+    isCollectingLocalStats() {
+        return Statistics.audioLevelsEnabled
+            && LocalStatsCollector.isLocalStatsSupported();
+    },
+
     /**
      * Executes callback with list of media devices connected.
      * @param {function} callback

modules/RTC/JitsiLocalTrack.js

  */
 JitsiLocalTrack.prototype._setRealDeviceIdFromDeviceList = function(devices) {
     const track = this.getTrack();
+
+    // FIXME for temasys video track, label refers to id not the actual device
     const device
         = devices.find(
             d => d.kind === `${track.kind}input` && d.label === track.label);

modules/statistics/LocalStatsCollector.js

  * Starts the collecting the statistics.
  */
 LocalStatsCollector.prototype.start = function() {
-    if (!context
-        || RTCBrowserType.isTemasysPluginUsed()) {
+    if (!LocalStatsCollector.isLocalStatsSupported()) {
         return;
     }
     context.resume();
     }
 };
 
+/**
+ * Checks if the environment has the necessary conditions to support
+ * collecting stats from local streams.
+ *
+ * @returns {boolean}
+ */
+LocalStatsCollector.isLocalStatsSupported = function() {
+    return Boolean(context && !RTCBrowserType.isTemasysPluginUsed());
+};
+
 module.exports = LocalStatsCollector;