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>

diff --git a/Documentation/media/uapi/v4l/depth-formats.rst b/Documentation/media/uapi/v4l/depth-formats.rst
index d1641e9..9533348 100644 (file)
--- a/Documentation/media/uapi/v4l/depth-formats.rst
+++ b/Documentation/media/uapi/v4l/depth-formats.rst
@@ -14,3 +14,4 @@ Depth data provides distance to points, mapped onto the image plane
 
     pixfmt-inzi
     pixfmt-z16
+    pixfmt-cnf4

diff --git a/Documentation/media/uapi/v4l/pixfmt-cnf4.rst b/Documentation/media/uapi/v4l/pixfmt-cnf4.rst
new file mode 100644 (file)
index 0000000..8f46929
--- /dev/null
+++ b/Documentation/media/uapi/v4l/pixfmt-cnf4.rst
@@ -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)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index e384142..363be5b 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -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;

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 2a22383..2db1635 100644 (file)
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -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 */