Media Source access

<?php
// Get the media source ID for the TV
$tv = $modx->getObject('modTemplateVar', '4');
$source = $tv->get('source');

// Get media source properties
$ms = $modx->getObject('modMediaSource', array('id' => $source));
$properties = $ms->get('properties');

echo '<pre>'; print_r($properties); die();