[Bug 796986] v4l2convert can't import padded DMA buffers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796986

--- Comment #1 from Philipp Zabel <p.zabel at pengutronix.de> ---
Created attachment 373372
  --> https://bugzilla.gnome.org/attachment.cgi?id=373372&action=edit
v4l2object: add gst_v4l2_object_set_format_vmeta

gst_v4l2_object_set_format already can handle VIDIOC_S_FMT returning
larger than requested buffers, and set GstVideoMeta appropriately
for the added padding.
This patch adds gst_v4l2_object_set_format_vmeta that can request
a padded format explicitly from an imported buffer's video meta.
This will allow elements that support cropping to import padded DMA
buffers.

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