[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: Sakari Ailus <sakari.ailus@iki.fi> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -978,3 +978,13 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
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return best;
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}
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EXPORT_SYMBOL_GPL(v4l2_find_nearest_format);
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void v4l2_get_timestamp(struct timeval *tv)
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{
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struct timespec ts;
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ktime_get_ts(&ts);
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tv->tv_sec = ts.tv_sec;
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tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
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}
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EXPORT_SYMBOL_GPL(v4l2_get_timestamp);
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@ -225,4 +225,6 @@ bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
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struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
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void v4l2_get_timestamp(struct timeval *tv);
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#endif /* V4L2_COMMON_H_ */
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