From 3cbe6e5bcad0b102c06b9c6029fda75630045475 Mon Sep 17 00:00:00 2001 From: Arun Kumar K Date: Wed, 14 May 2014 03:59:42 -0300 Subject: [PATCH] [media] v4l: Add source change event This event indicates that the video device has encountered a source parameter change during runtime. This can typically be a resolution change detected by a video decoder OR a format change detected by an input connector. This needs to be nofified to the userspace and the application may be expected to reallocate buffers before proceeding. The application can subscribe to events on a specific pad or input port which it is interested in. Signed-off-by: Arun Kumar K Acked-by: Sylwester Nawrocki Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- .../DocBook/media/v4l/vidioc-dqevent.xml | 33 +++++++++++++++++ .../media/v4l/vidioc-subscribe-event.xml | 20 +++++++++++ drivers/media/v4l2-core/v4l2-event.c | 36 +++++++++++++++++++ include/media/v4l2-event.h | 4 +++ include/uapi/linux/videodev2.h | 8 +++++ 5 files changed, 101 insertions(+) diff --git a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml index 89891adb928a..820f86e8744b 100644 --- a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml +++ b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml @@ -242,6 +242,22 @@ + + struct <structname>v4l2_event_src_change</structname> + + &cs-str; + + + __u32 + changes + + A bitmask that tells what has changed. See . + + + + +
+ Changes @@ -270,6 +286,23 @@
+ + + Source Changes + + &cs-def; + + + V4L2_EVENT_SRC_CH_RESOLUTION + 0x0001 + This event gets triggered when a resolution change is + detected at an input. This can come from an input connector or + from a video decoder. + + + + +
&return-value; diff --git a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml index 5c70b616d818..f016254377aa 100644 --- a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml +++ b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml @@ -154,6 +154,26 @@ frame interval in between them. + + V4L2_EVENT_SOURCE_CHANGE + 5 + + 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. + This event requires that the id + matches the input index (when used with a video device node) + or the pad index (when used with a subdevice node) from which + you want to receive events. + + This event has a &v4l2-event-source-change; associated + with it. The changes bitfield denotes + what has changed for the subscribed pad. If multiple events + occurred before application could dequeue them, then the changes + will have the ORed value of all the events generated. + + V4L2_EVENT_PRIVATE_START 0x08000000 diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c index 86dcb5483c42..8761aab99de9 100644 --- a/drivers/media/v4l2-core/v4l2-event.c +++ b/drivers/media/v4l2-core/v4l2-event.c @@ -318,3 +318,39 @@ int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh, return v4l2_event_unsubscribe(fh, sub); } EXPORT_SYMBOL_GPL(v4l2_event_subdev_unsubscribe); + +static void v4l2_event_src_replace(struct v4l2_event *old, + const struct v4l2_event *new) +{ + u32 old_changes = old->u.src_change.changes; + + old->u.src_change = new->u.src_change; + old->u.src_change.changes |= old_changes; +} + +static void v4l2_event_src_merge(const struct v4l2_event *old, + struct v4l2_event *new) +{ + new->u.src_change.changes |= old->u.src_change.changes; +} + +static const struct v4l2_subscribed_event_ops v4l2_event_src_ch_ops = { + .replace = v4l2_event_src_replace, + .merge = v4l2_event_src_merge, +}; + +int v4l2_src_change_event_subscribe(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub) +{ + if (sub->type == V4L2_EVENT_SOURCE_CHANGE) + return v4l2_event_subscribe(fh, sub, 0, &v4l2_event_src_ch_ops); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(v4l2_src_change_event_subscribe); + +int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd, + struct v4l2_fh *fh, struct v4l2_event_subscription *sub) +{ + return v4l2_src_change_event_subscribe(fh, sub); +} +EXPORT_SYMBOL_GPL(v4l2_src_change_event_subdev_subscribe); diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h index be05d019de25..1ab9045e52e3 100644 --- a/include/media/v4l2-event.h +++ b/include/media/v4l2-event.h @@ -132,4 +132,8 @@ int v4l2_event_unsubscribe(struct v4l2_fh *fh, void v4l2_event_unsubscribe_all(struct v4l2_fh *fh); int v4l2_event_subdev_unsubscribe(struct v4l2_subdev *sd, struct v4l2_fh *fh, struct v4l2_event_subscription *sub); +int v4l2_src_change_event_subscribe(struct v4l2_fh *fh, + const struct v4l2_event_subscription *sub); +int v4l2_src_change_event_subdev_subscribe(struct v4l2_subdev *sd, + struct v4l2_fh *fh, struct v4l2_event_subscription *sub); #endif /* V4L2_EVENT_H */ diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index db4aebd8baba..00259d2baa10 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -1764,6 +1764,7 @@ struct v4l2_streamparm { #define V4L2_EVENT_EOS 2 #define V4L2_EVENT_CTRL 3 #define V4L2_EVENT_FRAME_SYNC 4 +#define V4L2_EVENT_SOURCE_CHANGE 5 #define V4L2_EVENT_PRIVATE_START 0x08000000 /* Payload for V4L2_EVENT_VSYNC */ @@ -1795,12 +1796,19 @@ struct v4l2_event_frame_sync { __u32 frame_sequence; }; +#define V4L2_EVENT_SRC_CH_RESOLUTION (1 << 0) + +struct v4l2_event_src_change { + __u32 changes; +}; + struct v4l2_event { __u32 type; union { struct v4l2_event_vsync vsync; struct v4l2_event_ctrl ctrl; struct v4l2_event_frame_sync frame_sync; + struct v4l2_event_src_change src_change; __u8 data[64]; } u; __u32 pending; -- 2.20.1