[Bug 796106] video: Support alternate interlaced video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796106

--- Comment #16 from Zeeshan Ali (Khattak) <zeeshanak at gnome.org> ---
(In reply to Guillaume Desmottes from comment #15)
> We'll also have to change existing code as we are breaking the assumption
> 'info.size == buffer-size'.

No, we won't break that. The plan is to add a
gst_video_info_set_interlace_format(), that does the same as
gst_video_info_set_format() but also gets passed interlace mode, so for
ALTERNATE interlace mode, it'll ensure that size canculation takes into account
the half height.

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