[Freeswitch-users] playback options

I'm pulling shout cast streams into freeswitch using the playback action and I'm wondering if there is a variable like playback_delimeter that I could set within my dialplan/scripts that would essentially load up the stream and chop off a configurable amount of time before it essentially bridges up the audio to the caller? or perhaps there is a dialplan routine that could do this for me? Brian