track stream duration

Hi,

I want to track the duration of streamed data to a media player by a MS media server.

Using the playlist->getsimpletime is not valid for on-demand(player requesting specific media file or broadcast).

Is there a posisbility using media service sdk 9 to be able to achieve the same I woudl prefer a generic solution.

Would it make sense to write a event notification plugin , that listens to WMS_connect and wms_play events

Thanks