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| author | Sakari Ailus <sakari.ailus@iki.fi> | 2011-07-18 15:40:03 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-08-29 19:37:15 +0400 |
| commit | eab00a0da292fa7118aaf20da78e834866de00ae (patch) | |
| tree | 7e5be2825c3859c39114050a731d97c51d546e48 /Documentation/DocBook | |
| parent | c9f88aa976b79a26561fb7754a1e0e00ff7626fe (diff) | |
| download | linux-eab00a0da292fa7118aaf20da78e834866de00ae.tar.xz | |
[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')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-dqevent.xml | 22 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml | 16 |
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 5200b6874654..e8714aa16433 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 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> |