disabling branch of a pipeline

[Christian Sell]

Hello,
 
I have a pipeline which consists of several video streams, like this:
 
PIpeline
MyBin----------|
   MySource1 | -> playbin1 -> videosink1
   MySource2 |-> playbin 2-> videosink2
   MySource3 |-> playbin 3-> videosink3
------------------|
 
The user can only view one source at a time, but can switch between viewable
sources at will. This all works well already, but, as currently implemented,
full video processing takes place for all streams all the time. What I would
like to achieve is to "disable" those streams that are not currently being
viewed such that the basesrc->fill function is not even called on the respective
MySource elements. This is to avoid the significant processing overhead (buffer
allocation + debayering).
 
What would be the best way to do this?
 
thanks,
Christian
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