How to detect dynamically loaded plugins in playbin based app ?

[lucky chou]

Hi, I need to write a tool,  playbin2 based on of app real-time print
automatically loaded element's info,such as name,rank,
obj addr,etc...
That is to say, when loading a plugin into bin immediately use  signals or
events or message to notify app to print it.
If  do not modify the SDK's  code, there is a way to do it?

I read the gstbin.c  code, see there is a element-added signal, 
when a element to join bin, will emit a element-added signal.

But only send to its parent bin, that is, will not be nested into a more
upper bin.
For example, uridecodebin can receive an signal when decodebin2 is added ,
but will
 not receive element-added signal when a decoder(such as
avdec_aac,avdec_h264...) 
element plugged  in....

Any suggestion will be appreciated.

Thanks,
-chou



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