[Bug 785679] New: element: add gst_element_foreach_*pad()

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785679

            Bug ID: 785679
           Summary: element: add gst_element_foreach_*pad()
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: t.i.m at zen.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 356714
  --> https://bugzilla.gnome.org/attachment.cgi?id=356714&action=edit
element: add gst_element_foreach_*pad()

Add convenience API that iterates over all pads, sink pads or source pads and
makes sure that the foreach function is called exactly once for each pad.

This is a KISS implementation. It doesn't use GstIterator and doesn't try to do
clever things like resync if pads are added or removed while the function is
executing. We can still do that in future if we think it's needed, but in
practice it will likely make absolutely no difference whatsoever, since these
things will have to be handled properly elsewhere by the element anyway if
they're important.

This is also a replacement for gst_aggregator_iterate_sink_pads().

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