[Bug 775727] buffer: add gst_buffer_iterate_meta_filtered() convenience function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775727

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
> + * gst_buffer_iterate_meta_filtered:
> + * @buffer: a #GstBuffer
> + * @state: an opaque state pointer
> 
> That should probably be marked as "out".

Probably, or (inout).

> Is this usable in bindings without
> having some non-void typedef instead?

No idea, I just copied it from gst_buffer_iterate_meta() :)

I suspect both should just be marked as 'skip' for bindings, bindings can use
gst_buffer_meta_foreach().

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