[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 <arun.kk@samsung.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 8 insertions, 0 deletions

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;