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media: v4l: Add 4bpp packed depth confidence format CNF4 

Adding new fourcc CNF4 for 4 bit-per-pixel packed depth confidence
information provided by Intel RealSense cameras. Every two consecutive
pixels are packed into a single byte.

Signed-off-by: Sergey Dorodnicov <sergey.dorodnicov@intel.com>
Signed-off-by: Evgeni Raikhel <evgeni.raikhel@intel.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
hifive-unleashed-5.1
Sergey Dorodnicov 2018-09-12 02:42:06 -04:00 committed by Mauro Carvalho Chehab
parent d55c6f51fe
commit 92799ef720
4 changed files with 34 additions and 0 deletions
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1
Documentation/media/uapi/v4l/depth-formats.rst
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@ -14,3 +14,4 @@ Depth data provides distance to points, mapped onto the image plane
pixfmt-inzi
pixfmt-z16
pixfmt-cnf4

31
Documentation/media/uapi/v4l/pixfmt-cnf4.rst 100644
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@ -0,0 +1,31 @@
.. -*- coding: utf-8; mode: rst -*-
.. _V4L2-PIX-FMT-CNF4:
******************************
V4L2_PIX_FMT_CNF4 ('CNF4')
******************************
Depth sensor confidence information as a 4 bits per pixel packed array
Description
===========
Proprietary format used by Intel RealSense Depth cameras containing depth
confidence information in range 0-15 with 0 indicating that the sensor was
unable to resolve any signal and 15 indicating maximum level of confidence for
the specific sensor (actual error margins might change from sensor to sensor).
Every two consecutive pixels are packed into a single byte.
Bits 0-3 of byte n refer to confidence value of depth pixel 2*n,
bits 4-7 to confidence value of depth pixel 2*n+1.
**Bit-packed representation.**
.. flat-table::
:header-rows: 0
:stub-columns: 0
:widths: 64 64
* - Y'\ :sub:`01[3:0]`\ (bits 7--4) Y'\ :sub:`00[3:0]`\ (bits 3--0)
- Y'\ :sub:`03[3:0]`\ (bits 7--4) Y'\ :sub:`02[3:0]`\ (bits 3--0)

1
drivers/media/v4l2-core/v4l2-ioctl.c
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@ -1189,6 +1189,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_PIX_FMT_Y12I: descr = "Interleaved 12-bit Greyscale"; break;
case V4L2_PIX_FMT_Z16: descr = "16-bit Depth"; break;
case V4L2_PIX_FMT_INZI: descr = "Planar 10:16 Greyscale Depth"; break;
case V4L2_PIX_FMT_CNF4: descr = "4-bit Depth Confidence (Packed)"; break;
case V4L2_PIX_FMT_PAL8: descr = "8-bit Palette"; break;
case V4L2_PIX_FMT_UV8: descr = "8-bit Chrominance UV 4-4"; break;
case V4L2_PIX_FMT_YVU410: descr = "Planar YVU 4:1:0"; break;

1
include/uapi/linux/videodev2.h
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@ -689,6 +689,7 @@ struct v4l2_pix_format {
#define V4L2_PIX_FMT_MT21C v4l2_fourcc('M', 'T', '2', '1') /* Mediatek compressed block mode */
#define V4L2_PIX_FMT_INZI v4l2_fourcc('I', 'N', 'Z', 'I') /* Intel Planar Greyscale 10-bit and Depth 16-bit */
#define V4L2_PIX_FMT_SUNXI_TILED_NV12 v4l2_fourcc('S', 'T', '1', '2') /* Sunxi Tiled NV12 Format */
#define V4L2_PIX_FMT_CNF4 v4l2_fourcc('C', 'N', 'F', '4') /* Intel 4-bit packed depth confidence information */
/* 10bit raw bayer packed, 32 bytes for every 25 pixels, last LSB 6 bits unused */
#define V4L2_PIX_FMT_IPU3_SBGGR10 v4l2_fourcc('i', 'p', '3', 'b') /* IPU3 packed 10-bit BGGR bayer */