help! How does an element know it is added into the pipeline?

[kevin kelly]

Hello,there,

I am writing a decoder plugin and I need send an upstream event to its peer
element to send some information to its peer element before the state
changed to playing. 

My questions is how can I know that the decoder element is added into the
pipeline or how the decoder element know it is linked with its upstream peer
element?  

thanks a lot  for your input.




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