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media: Add Y012 video format

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Y012 is a luma-only formats with 12-bits per pixel,
expanded to 16bits.
Data in the 12 high bits, zeros in the 4 low bits,
arranged in little endian order.

Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Ming Qian 2023-03-22 05:13:05 +00:00 committed by Mauro Carvalho Chehab
parent aa10804042
commit a490ea6844
3 changed files with 17 additions and 0 deletions
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15
Documentation/userspace-api/media/v4l/pixfmt-yuv-luma.rst
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@ -103,6 +103,17 @@ are often referred to as greyscale formats.
- ...
- ...
* .. _V4L2-PIX-FMT-Y012:
- ``V4L2_PIX_FMT_Y012``
- 'Y012'
- Y'\ :sub:`0`\ [3:0] `0000`
- Y'\ :sub:`0`\ [11:4]
- ...
- ...
- ...
* .. _V4L2-PIX-FMT-Y14:
- ``V4L2_PIX_FMT_Y14``
@ -146,3 +157,7 @@ are often referred to as greyscale formats.
than 16 bits. For example, 10 bits per pixel uses values in the range 0 to
1023. For the IPU3_Y10 format 25 pixels are packed into 32 bytes, which
leaves the 6 most significant bits of the last byte padded with 0.
For Y012 and Y12 formats, Y012 places its data in the 12 high bits, with
padding zeros in the 4 low bits, in contrast to the Y12 format, which has
its padding located in the most significant bits of the 16 bit word.

1
drivers/media/v4l2-core/v4l2-ioctl.c
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@ -1303,6 +1303,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_PIX_FMT_Y6: descr = "6-bit Greyscale"; break;
case V4L2_PIX_FMT_Y10: descr = "10-bit Greyscale"; break;
case V4L2_PIX_FMT_Y12: descr = "12-bit Greyscale"; break;
case V4L2_PIX_FMT_Y012: descr = "12-bit Greyscale (bits 15-4)"; break;
case V4L2_PIX_FMT_Y14: descr = "14-bit Greyscale"; break;
case V4L2_PIX_FMT_Y16: descr = "16-bit Greyscale"; break;
case V4L2_PIX_FMT_Y16_BE: descr = "16-bit Greyscale BE"; break;

1
include/uapi/linux/videodev2.h
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@ -586,6 +586,7 @@ struct v4l2_pix_format {
#define V4L2_PIX_FMT_Y6 v4l2_fourcc('Y', '0', '6', ' ') /* 6 Greyscale */
#define V4L2_PIX_FMT_Y10 v4l2_fourcc('Y', '1', '0', ' ') /* 10 Greyscale */
#define V4L2_PIX_FMT_Y12 v4l2_fourcc('Y', '1', '2', ' ') /* 12 Greyscale */
#define V4L2_PIX_FMT_Y012 v4l2_fourcc('Y', '0', '1', '2') /* 12 Greyscale */
#define V4L2_PIX_FMT_Y14 v4l2_fourcc('Y', '1', '4', ' ') /* 14 Greyscale */
#define V4L2_PIX_FMT_Y16 v4l2_fourcc('Y', '1', '6', ' ') /* 16 Greyscale */
#define V4L2_PIX_FMT_Y16_BE v4l2_fourcc_be('Y', '1', '6', ' ') /* 16 Greyscale BE */