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authorSakari Ailus <sakari.ailus@iki.fi>2011-07-18 08:40:03 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-08-29 12:37:15 -0300
commiteab00a0da292fa7118aaf20da78e834866de00ae (patch)
tree7e5be2825c3859c39114050a731d97c51d546e48 /Documentation/DocBook/media/v4l
parentc9f88aa976b79a26561fb7754a1e0e00ff7626fe (diff)
[media] v4l: events: Define V4L2_EVENT_FRAME_SYNC
Define a frame sync event to tell user space when the reception of a frame starts. Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook/media/v4l')
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-dqevent.xml22
-rw-r--r--Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml16
2 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
index 5200b687465..e8714aa1643 100644
--- a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
@@ -88,6 +88,12 @@
</row>
<row>
<entry></entry>
+ <entry>&v4l2-event-frame-sync;</entry>
+ <entry><structfield>frame</structfield></entry>
+ <entry>Event data for event V4L2_EVENT_FRAME_SYNC.</entry>
+ </row>
+ <row>
+ <entry></entry>
<entry>__u8</entry>
<entry><structfield>data</structfield>[64]</entry>
<entry>Event data. Defined by the event type. The union
@@ -220,6 +226,22 @@
</tgroup>
</table>
+ <table frame="none" pgwide="1" id="v4l2-event-frame-sync">
+ <title>struct <structname>v4l2_event_frame_sync</structname></title>
+ <tgroup cols="3">
+ &cs-str;
+ <tbody valign="top">
+ <row>
+ <entry>__u32</entry>
+ <entry><structfield>frame_sequence</structfield></entry>
+ <entry>
+ The sequence number of the frame being received.
+ </entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+
<table pgwide="1" frame="none" id="changes-flags">
<title>Changes</title>
<tgroup cols="3">
diff --git a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml
index 275be9689d8..5c70b616d81 100644
--- a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml
@@ -139,6 +139,22 @@
</entry>
</row>
<row>
+ <entry><constant>V4L2_EVENT_FRAME_SYNC</constant></entry>
+ <entry>4</entry>
+ <entry>
+ <para>Triggered immediately when the reception of a
+ frame has begun. This event has a
+ &v4l2-event-frame-sync; associated with it.</para>
+
+ <para>If the hardware needs to be stopped in the case of a
+ buffer underrun it might not be able to generate this event.
+ In such cases the <structfield>frame_sequence</structfield>
+ field in &v4l2-event-frame-sync; will not be incremented. This
+ causes two consecutive frame sequence numbers to have n times
+ frame interval in between them.</para>
+ </entry>
+ </row>
+ <row>
<entry><constant>V4L2_EVENT_PRIVATE_START</constant></entry>
<entry>0x08000000</entry>
<entry>Base event number for driver-private events.</entry>