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[media] v4l2-common: add v4l_match_dv_timings

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

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-08-10 06:09:26 -03:00 committed by Mauro Carvalho Chehab
parent 977ebec754
commit c2a667fa2b
2 changed files with 37 additions and 0 deletions
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33
drivers/media/v4l2-core/v4l2-common.c
View file

@ -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)

4
include/media/v4l2-common.h
View file

@ -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_ */