var getVideoSourceList = function(){

      var deferred = $q.defer();
      var videoSourcesList = [];

      easyrtc.getVideoSourceList(function(list) {

        if(list.length > 0){
          for(var i=0; i < list.length; i++){
            var source = {};
            source.label = list[i].label;
            source.id = list[i].id;

            if(list[i].label.indexOf('back') > -1){
              source.cameraType = 'BACK_CAMERA';
            }
            else{
              source.cameraType = 'FRONT_CAMERA';
            }
            videoSourcesList.push(source);
          }
        }
        deferred.resolve(videoSourcesList);


      });
      return deferred.promise;
    };