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.
Signed-off-by: Sakari Ailus <sakari.ai...@iki.fi>
Acked-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
Changes since v1:
- Mention about timestamps in API changes
- Bump API version to 3.8
- DocBook compile fixes
- Tell realtime clock is the same as wall clock, and mention how to get such
timestamps in the user space
Documentation/DocBook/media/v4l/compat.xml | 12 +++++++++++
Documentation/DocBook/media/v4l/io.xml | 29 ++++++++++++++++++++++++++++
Documentation/DocBook/media/v4l/v4l2.xml | 12 ++++++++++-
include/uapi/linux/videodev2.h | 4 +++
4 files changed, 56 insertions(+), 1 deletions(-)
diff --git a/Documentation/DocBook/media/v4l/compat.xml
b/Documentation/DocBook/media/v4l/compat.xml
index 4fdf6b5..651ca52 100644
--- a/Documentation/DocBook/media/v4l/compat.xml
+++ b/Documentation/DocBook/media/v4l/compat.xml
@@ -2477,6 +2477,18 @@ that used it. It was originally scheduled for removal in
2.6.35.
</orderedlist>
</section>
+ <section>
+ <title>V4L2 in Linux 3.8</title>
+ <orderedlist>
+ <listitem>
+ <para>Added timestamp types to
+ <structfield>flags</structfield> field in
+ <structname>v4l2_buffer</structname>. See <xref
+ linkend="buffer-flags" />.</para>
+ </listitem>
+ </orderedlist>
+ </section>
+
<section id="other">
<title>Relation of V4L2 to other Linux multimedia APIs</title>
diff --git a/Documentation/DocBook/media/v4l/io.xml
b/Documentation/DocBook/media/v4l/io.xml
index 7e2f3d7..bcd1c8f7 100644
--- a/Documentation/DocBook/media/v4l/io.xml
+++ b/Documentation/DocBook/media/v4l/io.xml
@@ -938,6 +938,35 @@ Typically applications shall use this flag for output
buffers if the data
in this buffer has not been created by the CPU but by some DMA-capable unit,
in which case caches have not been used.</entry>
</row>
+ <row>
+ <entry><constant>V4L2_BUF_FLAG_TIMESTAMP_MASK</constant></entry>
+ <entry>0xe000</entry>
+ <entry>Mask for timestamp types below. To test the
+ timestamp type, mask out bits not belonging to timestamp
+ type by performing a logical and operation with buffer
+ flags and timestamp mask.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN</constant></entry>
+ <entry>0x0000</entry>
+ <entry>Unknown timestamp type. This type is used by
+ drivers before Linux 3.8 and may be either monotonic (see
+ below) or realtime (wall clock). Monotonic clock has been
+ favoured in embedded systems whereas most of the drivers
+ use the realtime clock. Either kinds of timestamps are
+ available in user space via
+ <function>clock_gettime(2)</function> using clock IDs
+ <constant>CLOCK_MONOTONIC</constant> and
+ <constant>CLOCK_REALTIME</constant>, respectively.</entry>
+ </row>
+ <row>
+
<entry><constant>V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC</constant></entry>
+ <entry>0x2000</entry>
+ <entry>The buffer timestamp has been taken from the
+ <constant>CLOCK_MONOTONIC</constant> clock. To access the
+ same clock outside V4L2, use
+ <function>clock_gettime(2)</function> .</entry>
+ </row>
</tbody>
</tgroup>
</table>
diff --git a/Documentation/DocBook/media/v4l/v4l2.xml
b/Documentation/DocBook/media/v4l/v4l2.xml
index 10ccde9..8b6f29e 100644
--- a/Documentation/DocBook/media/v4l/v4l2.xml
+++ b/Documentation/DocBook/media/v4l/v4l2.xml
@@ -140,6 +140,16 @@ structs, ioctls) must be noted in more detail in the
history chapter
applications. -->
<revision>
+ <revnumber>3.8</revnumber>
+ <date>2012-11-16</date>
+ <authorinitials>sa</authorinitials>
+ <revremark>Added timestamp types to
+ <structname>v4l2_buffer</structname>, see <xref
+ linkend="buffer-flags" />.
+ </revremark>
+ </revision>
+
+ <revision>
<revnumber>3.6</revnumber>
<date>2012-07-02</date>
<authorinitials>hv</authorinitials>
@@ -472,7 +482,7 @@ and discussions on the V4L mailing list.</revremark>
</partinfo>
<title>Video for Linux Two API Specification</title>
- <subtitle>Revision 3.6</subtitle>
+ <subtitle>Revision 3.8</subtitle>
<chapter id="common">
&sub-common;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 2fff7ff..410ea9f 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -686,6 +686,10 @@ 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
/*
* O V E R L A Y P R E V I E W
--
1.7.2.5
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