[Bug 738013] v4l2allocator: issue with import_userptr() in single-planar API when n_planes > 1

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738013
  GStreamer | gst-plugins-good | git master

--- Comment #11 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2015-01-23 16:39:39 UTC ---
Created an attachment (id=295286)
 View: https://bugzilla.gnome.org/attachment.cgi?id=295286
 Review: https://bugzilla.gnome.org/review?bug=738013&attachment=295286

v4l2allocator: let bufferpool calculate image size when importing userptr

Proposal patch to fix the size calculation as pointed out in comment 7.

As proposed, I move the calculation of size from allocation to bufferpool in
order to have video information.

I handle the tiled format but I'm not sure I've done it correctly since I'm not
familiar with them. And I have no hardware which support tiled format, so if
someone can test it.

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