Warn if no sound has been detected

Fix #29

lib/Vroom/I18N/en.pm

@@ -65,6 +65,7 @@ our %Lexicon = (
   "CLICK_TO_CHAT"                        => "Click to access the chat",
   "PREVENT_TO_JOIN"                      => "Prevent other participants to join this room",
   "MUTE_MIC"                             => "Turn off your microphone",
+  "NO_SOUND_DETECTED"                    => "No sound detected, please check your microphone (input level might be too low)",
   "SUSPEND_CAM"                          => "Suspend your webcam, other will see a black screen instead, but can still hear you",
   "CONFIGURE"                            => "Configuration",
   "YOU_CAN_PASSWORD_PROTECT_JOIN"        => "You can protect this room with a password",

lib/Vroom/I18N/fr.pm

@@ -70,6 +70,7 @@ our %Lexicon = (
     "CLICK_TO_CHAT"                             => "Cliquez ici pour accéder au tchat",
     "PREVENT_TO_JOIN"                           => "Empêchez d'autres participants de rejoindre ce salon",
     "MUTE_MIC"                                  => "Coupez votre micro",
+    "NO_SOUND_DETECTED"                         => "Aucun son n'a été détecté. Vérifiez votre micro (le volume de votre micro est peut-être trop faible)",
     "SUSPEND_CAM"                               => "Stoppez la webcam, les autres verront un écran noir à la place, " .
                                                    "mais pourront toujours vous entendre",
     "CONFIGURE"                                 => "Configuration",

public/js/vroom.js

@@ -33,7 +33,8 @@ var locale = {
   OWNER_PASSWORD_REMOVED_BY_s: '',
   CANT_SEND_TO_s: '',
   SCREEN_s: '',
-  TO_INVITE_SHARE_THIS_URL: ''
+  TO_INVITE_SHARE_THIS_URL: '',
+  NO_SOUND_DETECTED: ''
 };
 
 // Localize the strings we need
@@ -83,7 +84,8 @@ function initVroom(room) {
   };
   var mainVid = false,
       chatHistory = {},
-      chatIndex = 0;
+      chatIndex = 0,
+      maxVol = -100;
 
   $('#name_local').css('background-color', peers.local.color);
 
@@ -354,6 +356,9 @@ function initVroom(room) {
 
   // Handle volume changes from our own mic
   webrtc.on('volumeChange', function (volume, treshold) {
+    if (volume > maxVol){
+      maxVol = volume;
+    }
     if (peers.local.micMuted) {
       return;
     }
@@ -950,6 +955,16 @@ function initVroom(room) {
     });
   }, 60000);
 
+  // Check if sound is detected and warn if it hasn't
+  setTimeout(function (){
+    if (maxVol < -40){
+      $.notify(locale.NO_SOUND_DETECTED, {
+        className: 'error',
+        autoHide: false
+      });
+    }
+  }, 10000);
+
   window.onresize = function (){
     $('#webRTCVideo').css('max-height', maxHeight());
     $('#mainVideo>video').css('max-height', maxHeight());