feat(UI): Add UI support for camera issue detection

conference.js

@@ -293,8 +293,13 @@ function createLocalTracks (options, checkForPermissionPrompt) {
             firefox_fake_device: config.firefox_fake_device,
             desktopSharingExtensionExternalInstallation:
                 options.desktopSharingExtensionExternalInstallation
-        }, checkForPermissionPrompt)
-        .catch(function (err) {
+        }, checkForPermissionPrompt).then( (tracks) => {
+            tracks.forEach((track) => {
+                track.on(TrackEvents.NO_DATA_FROM_SOURCE,
+                    APP.UI.showTrackNotWorkingDialog.bind(null, track));
+            });
+            return tracks;
+        }).catch(function (err) {
             console.error(
                 'failed to create local tracks', options.devices, err);
             return Promise.reject(err);
@@ -865,8 +870,6 @@ export default {
 
         return promise.then(function () {
             if (stream) {
-                stream.on(TrackEvents.TRACK_AUDIO_NOT_WORKING,
-                    APP.UI.showAudioNotWorkingDialog);
                 return room.addTrack(stream);
             }
         }).then(() => {

lang/main.json

@@ -277,6 +277,7 @@
         "micNotFoundError": "Microphone was not found.",
         "micConstraintFailedError": "Yor microphone does not satisfy some of required constraints.",
         "micNotSendingData": "We are unable to access your microphone. Please select another device from the settings menu or try to restart the application.",
+        "cameraNotSendingData": "We are unable to access your camera. Please check if another application is using this device, select another device from the settings menu or try to restart the application.",
         "goToStore": "Go to the webstore",
         "externalInstallationTitle": "Extension required",
         "externalInstallationMsg": "You need to install our desktop sharing extension."

modules/UI/UI.js

@@ -1443,12 +1443,13 @@ UI.showDeviceErrorDialog = function (micError, cameraError) {
 
 /**
  * Shows error dialog that informs the user that no data is received from the
- * microphone.
+ * device.
  */
-UI.showAudioNotWorkingDialog = function () {
+UI.showTrackNotWorkingDialog = function (stream) {
     messageHandler.openMessageDialog(
         "dialog.error",
-        "dialog.micNotSendingData",
+        stream.isAudioTrack()? "dialog.micNotSendingData" :
+            "dialog.cameraNotSendingData",
         null,
         null);
 };