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media: uapi: v4l2-core: Add sensor ancillary data V4L2 foucc type.

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Add V4L2_META_FMT_SENSOR_DATA format 4CC.

This new format will be used by the BCM2835 Unicam device to return
out camera sensor embedded data.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
This commit is contained in:
Naushir Patuck
2020-04-01 08:46:29 +01:00
committed by popcornmix
parent e6c5e27dbb
commit 25e05b8ee1
4 changed files with 35 additions and 0 deletions
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1
Documentation/userspace-api/media/v4l/meta-formats.rst
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@@ -15,6 +15,7 @@ These formats are used for the :ref:`metadata` interface only.
pixfmt-meta-d4xx
pixfmt-meta-intel-ipu3
pixfmt-meta-rkisp1
pixfmt-meta-sensor-data
pixfmt-meta-uvc
pixfmt-meta-vsp1-hgo
pixfmt-meta-vsp1-hgt

32
Documentation/userspace-api/media/v4l/pixfmt-meta-sensor-data.rst Normal file
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@@ -0,0 +1,32 @@
.. Permission is granted to copy, distribute and/or modify this
.. document under the terms of the GNU Free Documentation License,
.. Version 1.1 or any later version published by the Free Software
.. Foundation, with no Invariant Sections, no Front-Cover Texts
.. and no Back-Cover Texts. A copy of the license is included at
.. Documentation/media/uapi/fdl-appendix.rst.
..
.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
.. _v4l2-meta-fmt-sensor-data:
***********************************
V4L2_META_FMT_SENSOR_DATA ('SENS')
***********************************
Sensor Ancillary Metadata
Description
===========
This format describes ancillary data generated by a camera sensor and
transmitted over a stream on the camera bus. Sensor vendors generally have their
own custom format for this ancillary data. Some vendors follow a generic
CSI-2/SMIA embedded data format as described in the `CSI-2 specification.
<https://mipi.org/specifications/csi-2>`_
The size of the embedded buffer is defined as a single line with a pixel width
width specified in bytes. This is obtained by a call to the
:c:type:`VIDIOC_SUBDEV_G_FMT` ioctl on the sensor subdevice where the ``pad``
field in :c:type:`v4l2_subdev_format` is set to 1. Note that this size is fixed
and cannot be modified with a call to :c:type:`VIDIOC_SUBDEV_S_FMT`.

1
drivers/media/v4l2-core/v4l2-ioctl.c
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@@ -1404,6 +1404,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_META_FMT_UVC: descr = "UVC Payload Header Metadata"; break;
case V4L2_META_FMT_D4XX: descr = "Intel D4xx UVC Metadata"; break;
case V4L2_META_FMT_VIVID: descr = "Vivid Metadata"; break;
case V4L2_META_FMT_SENSOR_DATA: descr = "Sensor Ancillary Metadata"; break;
default:
/* Compressed formats */

1
include/uapi/linux/videodev2.h
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@@ -778,6 +778,7 @@ struct v4l2_pix_format {
#define V4L2_META_FMT_UVC v4l2_fourcc('U', 'V', 'C', 'H') /* UVC Payload Header metadata */
#define V4L2_META_FMT_D4XX v4l2_fourcc('D', '4', 'X', 'X') /* D4XX Payload Header metadata */
#define V4L2_META_FMT_VIVID v4l2_fourcc('V', 'I', 'V', 'D') /* Vivid Metadata */
#define V4L2_META_FMT_SENSOR_DATA v4l2_fourcc('S', 'E', 'N', 'S') /* Sensor Ancillary metadata */
/* priv field value to indicates that subsequent fields are valid. */
#define V4L2_PIX_FMT_PRIV_MAGIC 0xfeedcafe