[Bug 745107] glimagesink: implement GstVideoOverlayCompositionMeta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745107

--- Comment #11 from Mingke Wang <mingke.wang at freescale.com> ---
(In reply to Tim-Philipp Müller from comment #10)
> Comment on attachment 298601 [details] [review]
> export GstVideoOverlayComposition and GstVideoOverlayRectangle structure
> 
> I don't think that's needed. Why do you think these need to be made public?
> What can't you get to otherwise?

I have a sink need implement
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION feature, so I use
gst_buffer_get_video_overlay_composition_meta() to get the composition meta
like following:

  GstVideoOverlayCompositionMeta *compmeta =
      gst_buffer_get_video_overlay_composition_meta(buffer);

then I need access the data in GstVideoOverlayCompositionMeta.

this was defined in video-overlay-composition.h as following:
struct _GstVideoOverlayCompositionMeta
{
  GstMeta meta;
  GstVideoOverlayComposition *overlay;
};

then I need access the GstVideoOverlayComposition and rectangles in
GstVideoOverlayComposition. but both of them are defined in
video-overlay-composition.c, How can I use them in my sink source code?

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