[media] vivid: add downsampling support

Add support in vivid for downsampling. Most of the changes are in
vivid_copy_buffer which needs to know about the right line widths.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
2 files changed