diff options
| author | Sakari Ailus <sakari.ailus@iki.fi> | 2011-07-18 08:40:03 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-08-29 12:37:15 -0300 |
| commit | eab00a0da292fa7118aaf20da78e834866de00ae (patch) | |
| tree | 7e5be2825c3859c39114050a731d97c51d546e48 /Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml | |
| parent | c9f88aa976b79a26561fb7754a1e0e00ff7626fe (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/vidioc-subscribe-event.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml index 275be9689d88..5c70b616d818 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> |