CC-3074: Give users the choice of which hardware sound API they wish to

use (instead of hardcoded to ALSA)

- finished everything except LS part(including upgrade and UI)

airtime_mvc/application/controllers/PreferenceController.php

@@ -198,6 +198,7 @@ class PreferenceController extends Zend_Controller_Action
                 }
                 
                 $values['icecast_vorbis_metadata'] = $form->getValue('icecast_vorbis_metadata');
+                $values['output_sound_device_type'] = $form->getValue('output_sound_device_type');
             }
             if(!$error){
                 Application_Model_StreamSetting::setStreamSetting($values);