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Commit abd23295 authored by Sakari Ailus's avatar Sakari Ailus Committed by Mauro Carvalho Chehab
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[media] v4l: Helper function for obtaining timestamps 



v4l2_get_timestamp() produces a monotonic timestamp but unlike
ktime_get_ts(), it uses struct timeval instead of struct timespec, saving
the drivers the conversion job when getting timestamps for v4l2_buffer's
timestamp field.

Signed-off-by: default avatarSakari Ailus <sakari.ailus@iki.fi>
Acked-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 1202ecdc

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

+10 −0
Original line number Diff line number Diff line
@@ -978,3 +978,13 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format( 
	return best;

}

EXPORT_SYMBOL_GPL(v4l2_find_nearest_format);



void v4l2_get_timestamp(struct timeval *tv)

{

	struct timespec ts;



	ktime_get_ts(&ts);

	tv->tv_sec = ts.tv_sec;

	tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;

}

EXPORT_SYMBOL_GPL(v4l2_get_timestamp);

include/media/v4l2-common.h

+2 −0
Original line number Diff line number Diff line
@@ -225,4 +225,6 @@ bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync, 


struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);



void v4l2_get_timestamp(struct timeval *tv);



#endif /* V4L2_COMMON_H_ */