CC-4393: Please ignore AAC and Flac items for Playlist Preview and disable to preview it as a single track

-disable preview icon

airtime_mvc/application/controllers/LibraryController.php

@@ -156,7 +156,7 @@ class LibraryController extends Zend_Controller_Action
         $user = new Application_Model_User($userInfo->id);
 
         //Open a jPlayer window and play the audio clip.
-        $menu["play"] = array("name"=> "Preview", "icon" => "play");
+        $menu["play"] = array("name"=> "Preview", "icon" => "play", "disabled" => false);
 
         $isAdminOrPM = $user->isUserType(array(UTYPE_ADMIN, UTYPE_PROGRAM_MANAGER));
 
@@ -166,6 +166,8 @@ class LibraryController extends Zend_Controller_Action
 
             $file = Application_Model_StoredFile::Recall($id);
 
+            $menu["play"]["mime"] = $file->getPropelOrm()->getDbMime();
+
             if (isset($obj_sess->id) && $screen == "playlist") {
                 // if the user is not admin or pm, check the creator and see if this person owns the playlist or Block
                 if ($obj_sess->type == 'playlist') {