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authorTrent Piepho <xyzzy@speakeasy.org>2009-05-30 20:45:46 -0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-23 02:21:18 -0400
commitb0d3159be9a36fd8b7b1cf88b812d951add53d11 (patch)
treeeb2be10df0843457ed94f8560ceb956fd37dd60c /include/media
parent2c0b19ac3b73199fe7b3fbff884051046554c048 (diff)
V4L/DVB (11901): v4l2: Create helper function for bounding and aligning images
Most hardware has limits on minimum and maximum image dimensions and also requirements about alignment. For example, image width must be even or a multiple of four. Some hardware has requirements that the total image size (width * height) be a multiple of some power of two. v4l_bound_align_image() will enforce min and max width and height, power of two alignment on width and height, and power of two alignment on total image size. It uses an efficient algorithm that will try to find the "closest" image size that meets the requirements. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media')
-rw-r--r--include/media/v4l2-common.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 95f4364322eb..33a18426ab9b 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -209,4 +209,14 @@ struct v4l2_routing {
209 u32 output; 209 u32 output;
210}; 210};
211 211
212/* ------------------------------------------------------------------------- */
213
214/* Miscellaneous helper functions */
215
216void v4l_bound_align_image(unsigned int *w, unsigned int wmin,
217 unsigned int wmax, unsigned int walign,
218 unsigned int *h, unsigned int hmin,
219 unsigned int hmax, unsigned int halign,
220 unsigned int salign);
221
212#endif /* V4L2_COMMON_H_ */ 222#endif /* V4L2_COMMON_H_ */