How to make a N to 1 custom plugin

[lottery]

I want to make a custom plugin for stitching N sinks to 1 src. And the frame
size of  src is base on the frame size of input.  -------                                    
custom|         |                            ----------------| src  0| \                         
|                    ||         |    \ ---------------- |sink0             |
-------                             |                 src|                                       
|                     |  -------       ---------------- |sink1             
||         |  /                        |                     ||   src1|/                          
-----------------|         | -------But actually I know little about this.I
have looked through the videomixer gstramer-good plugin.But it is too
complex for my target.I just I want to use a fixed caps pad with only one
video format.I seems the GstCollectPads should be used to control the flow. 
But which methods should be implemented?Can Is there anyone can give me some
advice?Thanks very much!



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