Commit c2a667fa authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

[media] v4l2-common: add v4l_match_dv_timings 



Add the v4l_match_dv_timings function that can be used to compare two
v4l2_dv_timings structs.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 977ebec7

drivers/media/v4l2-core/v4l2-common.c

+33 −0
Original line number Diff line number Diff line
@@ -597,6 +597,39 @@ int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info) 
}

EXPORT_SYMBOL_GPL(v4l_fill_dv_preset_info);



/**

 * v4l_match_dv_timings - check if two timings match

 * @t1 - compare this v4l2_dv_timings struct...

 * @t2 - with this struct.

 * @pclock_delta - the allowed pixelclock deviation.

 *

 * Compare t1 with t2 with a given margin of error for the pixelclock.

 */

bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1,

			  const struct v4l2_dv_timings *t2,

			  unsigned pclock_delta)

{

	if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)

		return false;

	if (t1->bt.width == t2->bt.width &&

	    t1->bt.height == t2->bt.height &&

	    t1->bt.interlaced == t2->bt.interlaced &&

	    t1->bt.polarities == t2->bt.polarities &&

	    t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta &&

	    t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta &&

	    t1->bt.hfrontporch == t2->bt.hfrontporch &&

	    t1->bt.vfrontporch == t2->bt.vfrontporch &&

	    t1->bt.vsync == t2->bt.vsync &&

	    t1->bt.vbackporch == t2->bt.vbackporch &&

	    (!t1->bt.interlaced ||

		(t1->bt.il_vfrontporch == t2->bt.il_vfrontporch &&

		 t1->bt.il_vsync == t2->bt.il_vsync &&

		 t1->bt.il_vbackporch == t2->bt.il_vbackporch)))

		return true;

	return false;

}

EXPORT_SYMBOL_GPL(v4l_match_dv_timings);



const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(

		const struct v4l2_discrete_probe *probe,

		s32 width, s32 height)

include/media/v4l2-common.h

+4 −0
Original line number Diff line number Diff line
@@ -212,4 +212,8 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format( 
		const struct v4l2_discrete_probe *probe,

		s32 width, s32 height);



bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1,

			  const struct v4l2_dv_timings *t2,

			  unsigned pclock_delta);



#endif /* V4L2_COMMON_H_ */