add_filter('post_link', 'rating_permalink', 10, 3);
add_filter('post_type_link', 'rating_permalink', 10, 3);

function rating_permalink($permalink, $post_id, $leavename) {
	$rpem = unserialize(ALL_CHANNELS);
	$valid = false;
	foreach ($rpem as $pem) if (strpos($permalink, "%$pem%") !== FALSE) $valid = $pem;
	if ($valid === FALSE) return $permalink;
        // Get post
    $post = get_post($post_id);
    if (!$post) return $permalink;
    // Get taxonomy terms
    $terms = wp_get_object_terms($post->ID, TAXONOMY_PREFIX.$valid);
    if (!is_wp_error($terms) && !empty($terms) && is_object($terms[0])) $taxonomy_slug = $terms[0]->slug;
    else $taxonomy_slug = 'uncategorized';
	return str_replace("%$valid%", $taxonomy_slug."/%$valid%", $permalink);
}