[Bug 768160] qtplugins: How to implement qmlglsrc.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768160

--- Comment #39 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #38)
> i.e. not all elements support the transformation meta. gltransformation and
> glimagesink are the only elements that do so you need something else to flip
> when the transformation meta is not supported.

How can qmlglsrc get to know if downstream support the transformation meta? The
only method that comes to me is to use GST_TAG_IMAGE_ORIENTATION to inform
downstream the orientation which is support by videoflip, glvideoflip and
glimagesink, but need set property to let them get tag event. If use
GST_TAG_IMAGE_ORIENTATION, we should remove transformation meta from output
buffer in case that glimagesink will do flip twice.

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