[Bug 745107] glimagesink: implement GstVideoOverlayCompositionMeta

[GStreamer (GNOME Bugzilla)]

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

--- Comment #22 from Lubosz Sarnecki <lubosz at gmail.com> ---
Created attachment 305568
  --> https://bugzilla.gnome.org/attachment.cgi?id=305568&action=edit
glimagesinkbin: Add allocation query for GstVideoOverlayComposition

    Adds an GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE query
    to glupload, glcolorconvert and glimagesink.
    Detects the query from the downstream elements, so it is executed
    only when downstream supports the overlay API.
    This makes pipelines with textoverlay ! glupload ! gldownload ! xvimagesink
possible.

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