Recursively looks for elements with an unlinked pad of the given direction within the specified bin and returns an unlinked pad if one is
found, or null
otherwise.
If a pad is found, the caller owns a reference to it and should use unref on the pad when it is not needed any longer.
this |
bin in which to look for elements with unlinked pads |
direction |
whether to look for an unlinked source or sink pad |
unlinked pad of the given direction. |