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[media] v4l: Define video buffer flags for timestamp types

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Define video buffer flags for different timestamp types. Everything up to
now have used either realtime clock or monotonic clock, without a way to
tell which clock the timestamp was taken from.
Also document that the clock source of the timestamp in the timestamp field
depends on buffer flags.

[mchehab@redhat.com: fix a few wrong references to Kernel 3.8 - as this patch
 is meant for 3.9]
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sakari Ailus
2012-10-21 16:02:47 -03:00
committed by Mauro Carvalho Chehab
parent 1b5901331f
commit 1202ecdc24
4 changed files with 69 additions and 12 deletions
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4
include/uapi/linux/videodev2.h
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@@ -701,6 +701,10 @@ struct v4l2_buffer {
/* Cache handling flags */
#define V4L2_BUF_FLAG_NO_CACHE_INVALIDATE 0x0800
#define V4L2_BUF_FLAG_NO_CACHE_CLEAN 0x1000
/* Timestamp type */
#define V4L2_BUF_FLAG_TIMESTAMP_MASK 0xe000
#define V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN 0x0000
#define V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC 0x2000
/**
* struct v4l2_exportbuffer - export of video buffer as DMABUF file descriptor