[Bug 611157] video: API to signal stereoscopic and multiview video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=611157

--- Comment #95 from Jan Schmidt <thaytan at noraisin.net> ---
Some minor changes to the implementation. At the moment, I'm still working on
what's needed for general (non-stereo) multiview support. The
GstVideoMultiviewMeta is only needed for view labelling in that case, so I'm
tempted to leave it out for now. For stereo handling, the caps and buffer
changes are sufficient for signalling everything needed.

For frame packed stereo, I took a different path than some suggested above.
Since there's no sensible way to describe all the packed layouts with
GstVideoInfo, everything needs to be taught explicitly anyway. So in this
design, they are reported as 1 view in the caps / GstVideoInfo and it's up to
elements that care to know how to handle them. Existing elements continue to
treat them as a single buffer, which is no worse than the status quo.

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