Time Stretching

Hi all,
I'm trying to active the function of time stretching.
I saw that i can use the post plugins.

The code below print the post plugin audio
const char *const *post_ids;
int post_id=0;

post_ids = xine_list_post_plugins_typed(xine, XINE_POST_TYPE_AUDIO_FILTER);
post_id  = (char *)*post_ids++;

while (post_id)
 {
				
	printf ("%s \n", post_id);
	post_id  = (char *)*post_ids++;
}

one is the "stretch".

I used the xine_post_init to initialize my filter , but now i don't
know how  I can enable  my filter.
post = xine_post_init(xine, "stretch", 0, ao_port, vo_port);

thanks,
Pikketto

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