[Bug 735379] mpeg2dec: use stride information from GstVideoFrame

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=735379

--- Comment #9 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
So I'm posting this patch at a first step. For the next step we need to do two
things. As we can only provide 1 stride for all the planes, we need to check
how mpeg2dec scales the stride, and make sure the pool provide buffers with
strides that are compatible. I think the easiest is to activate the pool, and
acquire a buffer. Then get the VideoMeta and check. I think it's faire to
assume this won't change for buffers of the same pool. Then we just have to
tell mpeg2dec as found in previous patches. This check is only needed if we
need_alignment of course.

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