diff options
Diffstat (limited to 'Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml | 123 |
1 files changed, 16 insertions, 107 deletions
diff --git a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml index 69c0d8a2a3d..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> @@ -183,113 +199,6 @@ </tgroup> </table> - <table frame="none" pgwide="1" id="v4l2-event-vsync"> - <title>struct <structname>v4l2_event_vsync</structname></title> - <tgroup cols="3"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u8</entry> - <entry><structfield>field</structfield></entry> - <entry>The upcoming field. See &v4l2-field;.</entry> - </row> - </tbody> - </tgroup> - </table> - - <table frame="none" pgwide="1" id="v4l2-event-ctrl"> - <title>struct <structname>v4l2_event_ctrl</structname></title> - <tgroup cols="4"> - &cs-str; - <tbody valign="top"> - <row> - <entry>__u32</entry> - <entry><structfield>changes</structfield></entry> - <entry></entry> - <entry>A bitmask that tells what has changed. See <xref linkend="changes-flags" />.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>type</structfield></entry> - <entry></entry> - <entry>The type of the control. See &v4l2-ctrl-type;.</entry> - </row> - <row> - <entry>union (anonymous)</entry> - <entry></entry> - <entry></entry> - <entry></entry> - </row> - <row> - <entry></entry> - <entry>__s32</entry> - <entry><structfield>value</structfield></entry> - <entry>The 32-bit value of the control for 32-bit control types. - This is 0 for string controls since the value of a string - cannot be passed using &VIDIOC-DQEVENT;.</entry> - </row> - <row> - <entry></entry> - <entry>__s64</entry> - <entry><structfield>value64</structfield></entry> - <entry>The 64-bit value of the control for 64-bit control types.</entry> - </row> - <row> - <entry>__u32</entry> - <entry><structfield>flags</structfield></entry> - <entry></entry> - <entry>The control flags. See <xref linkend="control-flags" />.</entry> - </row> - <row> - <entry>__s32</entry> - <entry><structfield>minimum</structfield></entry> - <entry></entry> - <entry>The minimum value of the control. See &v4l2-queryctrl;.</entry> - </row> - <row> - <entry>__s32</entry> - <entry><structfield>maximum</structfield></entry> - <entry></entry> - <entry>The maximum value of the control. See &v4l2-queryctrl;.</entry> - </row> - <row> - <entry>__s32</entry> - <entry><structfield>step</structfield></entry> - <entry></entry> - <entry>The step value of the control. See &v4l2-queryctrl;.</entry> - </row> - <row> - <entry>__s32</entry> - <entry><structfield>default_value</structfield></entry> - <entry></entry> - <entry>The default value value of the control. See &v4l2-queryctrl;.</entry> - </row> - </tbody> - </tgroup> - </table> - - <table pgwide="1" frame="none" id="changes-flags"> - <title>Changes</title> - <tgroup cols="3"> - &cs-def; - <tbody valign="top"> - <row> - <entry><constant>V4L2_EVENT_CTRL_CH_VALUE</constant></entry> - <entry>0x0001</entry> - <entry>This control event was triggered because the value of the control - changed. Special case: if a button control is pressed, then this - event is sent as well, even though there is not explicit value - associated with a button control.</entry> - </row> - <row> - <entry><constant>V4L2_EVENT_CTRL_CH_FLAGS</constant></entry> - <entry>0x0002</entry> - <entry>This control event was triggered because the control flags - changed.</entry> - </row> - </tbody> - </tgroup> - </table> </refsect1> <refsect1> &return-value; |