jsdoc fix + verbose logger (Dash-Industry-Forum#4980)

* make track filtering more verbose

* add missing methods to JSDoc

Author: stschr

src/streaming/MediaPlayer.js

@@ -1874,13 +1874,17 @@ function MediaPlayer() {
     /**
      * Registers a custom initial track selection function. Only one function is allowed. Calling this method will overwrite a potentially existing function.
      * @param {function} customFunc - the custom function that returns the initial track
+     * @memberof module:MediaPlayer
+     * @instance
      */
     function setCustomInitialTrackSelectionFunction(customFunc) {
         customParametersModel.setCustomInitialTrackSelectionFunction(customFunc);
     }
 
     /**
      * Resets the custom initial track selection
+     * @memberof module:MediaPlayer
+     * @instance
      */
     function resetCustomInitialTrackSelectionFunction() {
         customParametersModel.resetCustomInitialTrackSelectionFunction(null);

src/streaming/controllers/MediaController.js

@@ -419,6 +419,7 @@ function MediaController() {
             }
         });
         if (tracksAfterMatcher.length !== 0) {
+            logger.info('Filter-Function (' + filterFn.name + ') resulted in ' + tracksAfterMatcher.length + ' tracks');
             return tracksAfterMatcher;
         }