the name of the #GstPad in source element or %NULL for any pad.
the #GstElement containing the destination pad.
the name of the #GstPad in destination element or %NULL for any pad.
the #GstCaps to filter the link, or %NULL for no filter.
%TRUE if the pads could be linked, %FALSE otherwise.
Links the two named pads of the source and destination elements. Side effect is that if one of the pads has no parent, it becomes a child of the parent of the other element. If they have different parents, the link fails. If @caps is not %NULL, makes sure that the caps of the link is a subset of @caps.