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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 Dom Cobley
parent e9740eeffc
commit c462b4dbeb
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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@@ -19,6 +19,7 @@ These formats are used for the :ref:`metadata` interface only.
metafmt-pisp-be
metafmt-pisp-fe
metafmt-rkisp1
metafmt-sensor-data
metafmt-uvc
metafmt-uvc-msxu-1-5
metafmt-vivid

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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@@ -1486,6 +1486,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_META_FMT_GENERIC_CSI2_16: descr = "8-bit Generic Meta, 16b CSI-2"; break;
case V4L2_META_FMT_GENERIC_CSI2_20: descr = "8-bit Generic Meta, 20b CSI-2"; break;
case V4L2_META_FMT_GENERIC_CSI2_24: descr = "8-bit Generic Meta, 24b CSI-2"; 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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@@ -874,6 +874,7 @@ struct v4l2_pix_format {
#define V4L2_META_FMT_D4XX v4l2_fourcc('D', '4', 'X', 'X') /* D4XX Payload Header metadata */
#define V4L2_META_FMT_UVC_MSXU_1_5 v4l2_fourcc('U', 'V', 'C', 'M') /* UVC MSXU 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 */
/* Vendor specific - used for RK_ISP1 camera sub-system */
#define V4L2_META_FMT_RK_ISP1_PARAMS v4l2_fourcc('R', 'K', '1', 'P') /* Rockchip ISP1 3A Parameters */