On 06/15/2016 12:49 AM, Steve Longerbeam wrote:
> Add a signal lock status change to the source changes bitmask.
> This indicates there was a signal lock or unlock event detected
> at the input of a video decoder.
>
> Signed-off-by: Steve Longerbeam <[email protected]>
> ---
> Documentation/DocBook/media/v4l/vidioc-dqevent.xml | 12 ++++++++++--
> include/uapi/linux/videodev2.h | 1 +
> 2 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
> b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
> index c9c3c77..7758ad7 100644
> --- a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
> +++ b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml
> @@ -233,8 +233,9 @@
> <entry>
> <para>This event is triggered when a source parameter change is
> detected during runtime by the video device. It can be a
> - runtime resolution change triggered by a video decoder or the
> - format change happening on an input connector.
> + runtime resolution change or signal lock status change
> + triggered by a video decoder, or the format change happening
> + on an input connector.
> This event requires that the <structfield>id</structfield>
> matches the input index (when used with a video device node)
> or the pad index (when used with a subdevice node) from which
> @@ -461,6 +462,13 @@
> from a video decoder.
> </entry>
> </row>
> + <row>
> + <entry><constant>V4L2_EVENT_SRC_CH_LOCK_STATUS</constant></entry>
> + <entry>0x0002</entry>
> + <entry>This event gets triggered when there is a signal lock or
> + unlock detected at the input of a video decoder.
> + </entry>
> + </row>
I'm not entirely sure I like this. Typically losing lock means that this event
is triggered with the V4L2_EVENT_SRC_CH_RESOLUTION flag set, and userspace has
to check the new timings etc., which will fail if there is no lock anymore.
This information is also available through ENUMINPUT.
I would need to know more about why you think this is needed, because I don't
see what this adds.
Regards,
Hans
> </tbody>
> </tgroup>
> </table>
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 8f95191..2eba5da 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -2076,6 +2076,7 @@ struct v4l2_event_frame_sync {
> };
>
> #define V4L2_EVENT_SRC_CH_RESOLUTION (1 << 0)
> +#define V4L2_EVENT_SRC_CH_LOCK_STATUS (1 << 1)
>
> struct v4l2_event_src_change {
> __u32 changes;
>
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