gstreamer/docs/random/padarch

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--src---------------------------- --sink----------------------------
| |
--srcpad--------| |--sinkpad-------
| pad_push() . . |
push() | ->chain . . ->chain | -> chain()
| . . |
----------------| |----------------
| |
chain() is the function provided by sink element
sinkpad->chain is a pointer to that function
srcpad->chain should be a copy of that pointer
pad_push() calls the function pointer srcpad->chain
push() is the function provided by the src element