[PATCH v5 16/39] [media] v4l2: add a new-frame before end-of-frame event
From: slongerbeam@gmail.com (Steve Longerbeam)
Date: 2017-03-10 05:02:10
Also in:
linux-devicetree, linux-media, lkml
Subsystem:
documentation, media input infrastructure (v4l/dvb), the rest · Maintainers:
Jonathan Corbet, Mauro Carvalho Chehab, Linus Torvalds
Add a NEW_FRAME_BEFORE_EOF event to signal that a video capture or output device has signaled a new frame is ready before a previous frame has completed reception or transmission. This usually indicates a DMA read/write channel is having trouble gaining bus access. Signed-off-by: Steve Longerbeam <redacted> --- Documentation/media/uapi/v4l/vidioc-dqevent.rst | 6 ++++++ Documentation/media/videodev2.h.rst.exceptions | 1 + include/uapi/linux/videodev2.h | 1 + 3 files changed, 8 insertions(+)
diff --git a/Documentation/media/uapi/v4l/vidioc-dqevent.rst b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
index dc77363..54bc7ae 100644
--- a/Documentation/media/uapi/v4l/vidioc-dqevent.rst
+++ b/Documentation/media/uapi/v4l/vidioc-dqevent.rst@@ -203,6 +203,12 @@ call. has measured an interval between the reception or transmit completion of two consecutive frames of video that is outside the nominal frame interval by some tolerance value. + * - ``V4L2_EVENT_NEW_FRAME_BEFORE_EOF`` + - 8 + - This event is triggered when the video capture or output device + has signaled a new frame is ready before a previous frame has + completed reception or transmission. This usually indicates a + DMA read/write channel is having trouble gaining bus access. * - ``V4L2_EVENT_PRIVATE_START`` - 0x08000000 - Base event number for driver-private events.
diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
index c7d8fad..be6f332 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions@@ -460,6 +460,7 @@ replace define V4L2_EVENT_FRAME_SYNC event-type replace define V4L2_EVENT_SOURCE_CHANGE event-type replace define V4L2_EVENT_MOTION_DET event-type replace define V4L2_EVENT_FRAME_INTERVAL_ERROR event-type +replace define V4L2_EVENT_NEW_FRAME_BEFORE_EOF event-type replace define V4L2_EVENT_PRIVATE_START event-type replace define V4L2_EVENT_CTRL_CH_VALUE ctrl-changes-flags
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index cf5a0d0..f54a82a 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h@@ -2132,6 +2132,7 @@ struct v4l2_streamparm { #define V4L2_EVENT_SOURCE_CHANGE 5 #define V4L2_EVENT_MOTION_DET 6 #define V4L2_EVENT_FRAME_INTERVAL_ERROR 7 +#define V4L2_EVENT_NEW_FRAME_BEFORE_EOF 8 #define V4L2_EVENT_PRIVATE_START 0x08000000 /* Payload for V4L2_EVENT_VSYNC */
--
2.7.4