filter for some elements of the Feeds of a WP blog

<?php
/*
Plugin Name: Feed Element Filter
Plugin URI:
Description: filters some of the Feed elements
Author:
Version: 1.0
Author URI:
*/

add_filter('bloginfo_rss', 'pff_modify_bloginfo', 10, 2);
function pff_modify_bloginfo($content, $feedelementname) {
    // This filter can filter the Feed title, the URL and the description
    Switch ($feedelementname) {
        case 'name' : // Feed title
            // If it is the feed with the slug 'podcast' replace the title as long as this plugin is active.
            // ( get_query_var('feed') can also be'feed' (RSS2), 'atom' (ATOM))
            if ( 'podcast' === get_query_var('feed') ) {
                // The new Feed title:
                return 'My Podcast';
            } else {
                return $content;
            }
        break;
        case 'description' : // Feed description
            return $content;
        break;
        case 'url' : // Feed URL
            return $content;
        break;
        default :
            return $content;
        break;
    }
}
?>