RE: [PATCH v3 03/10] media: Add YUYV64_12 video format

From: Ming Qian
Date: Sun Feb 19 2023 - 21:15:56 EST

>From: Mirela Rabulea (OSS) <mirela.rabulea@xxxxxxxxxxx>
>Sent: 2023年2月19日 5:52
>To: Ming Qian <ming.qian@xxxxxxx>; mchehab@xxxxxxxxxx; hverkuil-
>cisco@xxxxxxxxx; nicolas@xxxxxxxxxxxx
>Cc: shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx;
>festevam@xxxxxxxxx; X.H. Bao <xiahong.bao@xxxxxxx>; dl-linux-imx <linux-
>imx@xxxxxxx>; linux-media@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
>devicetree@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [PATCH v3 03/10] media: Add YUYV64_12 video format
>
>Hi,
>
>On 14.02.2023 12:04, Ming Qian wrote:
>> YUYV64_12 is a YUV format with 12-bits per component like YUYV,
>> 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@xxxxxxx>
>> ---
>> .../media/v4l/pixfmt-packed-yuv.rst | 42 +++++++++++++++++++
>> drivers/media/v4l2-core/v4l2-common.c | 1 +
>> drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
>> include/uapi/linux/videodev2.h | 1 +
>> 4 files changed, 45 insertions(+)
>>
>> diff --git
>> a/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst
>> b/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst
>> index bf283a1b5581..76fc331f126e 100644
>> --- a/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst
>> +++ b/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst
>> @@ -341,6 +341,48 @@ components horizontally by 2, storing 2 pixels in 4
>bytes.
>>
>> \normalsize
>>
>> +The next lists the packed YUV 4:2:2 formats with more than 8 bits per
>component.
>> +expand the bits per component to 16 bits, data in the high bits,
>> +zeros in the low bits, arranged in little endian order. storing 2 pixels in 8
>bytes.
>> +
>> +.. raw:: latex
>> +
>> + \footnotesize
>> +
>> +.. tabularcolumns::
>>
>+|p{3.4cm}|p{1.2cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8
>> +cm}|p{0.8cm}|p{0.8cm}|
>> +
>> +.. flat-table:: Packed YUV 4:2:2 Formats (more than 8bpc)
>> + :header-rows: 1
>> + :stub-columns: 0
>> +
>> + * - Identifier
>> + - Code
>> + - Byte 1-0
>> + - Byte 3-2
>> + - Byte 5-4
>> + - Byte 7-6
>> + - Byte 9-8
>> + - Byte 11-10
>> + - Byte 13-12
>> + - Byte 15-14
>> + * .. _V4L2-PIX-FMT-YUYV64-12:
>> +
>> + - ``V4L2_PIX_FMT_YUYV64_12``
>> + - 'Y212'
>> +
>> + - Y'\ :sub:`0`
>> + - Cb\ :sub:`0`
>> + - Y'\ :sub:`1`
>> + - Cr\ :sub:`0`
>> + - Y'\ :sub:`2`
>> + - Cb\ :sub:`2`
>> + - Y'\ :sub:`3`
>> + - Cr\ :sub:`2`
>> +
>> +.. raw:: latex
>> +
>> + \normalsize
>> +
>> **Color Sample Location:**
>> Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
>> horizontally.
>> diff --git a/drivers/media/v4l2-core/v4l2-common.c
>> b/drivers/media/v4l2-core/v4l2-common.c
>> index a5e8ba370d33..8fb1c0fa8158 100644
>> --- a/drivers/media/v4l2-core/v4l2-common.c
>> +++ b/drivers/media/v4l2-core/v4l2-common.c
>> @@ -258,6 +258,7 @@ const struct v4l2_format_info
>*v4l2_format_info(u32 format)
>> { .format = V4L2_PIX_FMT_YVYU, .pixel_enc =
>V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0,
>0 }, .hdiv = 2, .vdiv = 1 },
>> { .format = V4L2_PIX_FMT_UYVY, .pixel_enc =
>V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0,
>0 }, .hdiv = 2, .vdiv = 1 },
>> { .format = V4L2_PIX_FMT_VYUY, .pixel_enc =
>V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0,
>0 }, .hdiv = 2, .vdiv = 1 },
>> + { .format = V4L2_PIX_FMT_YUYV64_12, .pixel_enc =
>> +V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0,
>> +0, 0 }, .hdiv = 2, .vdiv = 1 },
>>
>> /* YUV planar formats */
>> { .format = V4L2_PIX_FMT_NV12, .pixel_enc =
>V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0,
>0 }, .hdiv = 2, .vdiv = 2 },
>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c
>> b/drivers/media/v4l2-core/v4l2-ioctl.c
>> index ec1c9ef27e88..e5002d6fe7ee 100644
>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>> @@ -1343,6 +1343,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc
>*fmt)
>> case V4L2_PIX_FMT_YUV420: descr = "Planar YUV 4:2:0"; break;
>> case V4L2_PIX_FMT_HI240: descr = "8-bit Dithered RGB (BTTV)";
>break;
>> case V4L2_PIX_FMT_M420: descr = "YUV 4:2:0 (M420)";
>break;
>> + case V4L2_PIX_FMT_YUYV64_12: descr = "12-bit Depth YUYV
>4:2:2"; break;
>> case V4L2_PIX_FMT_NV12: descr = "Y/UV 4:2:0"; break;
>> case V4L2_PIX_FMT_NV21: descr = "Y/VU 4:2:0"; break;
>> case V4L2_PIX_FMT_NV16: descr = "Y/UV 4:2:2"; break;
>> diff --git a/include/uapi/linux/videodev2.h
>> b/include/uapi/linux/videodev2.h index 3d8f89bff33c..3712a36d6fdf
>> 100644
>> --- a/include/uapi/linux/videodev2.h
>> +++ b/include/uapi/linux/videodev2.h
>> @@ -618,6 +618,7 @@ struct v4l2_pix_format {
>> #define V4L2_PIX_FMT_YUVA32 v4l2_fourcc('Y', 'U', 'V', 'A') /* 32 YUVA-8-
>8-8-8 */
>> #define V4L2_PIX_FMT_YUVX32 v4l2_fourcc('Y', 'U', 'V', 'X') /* 32 YUVX-8-
>8-8-8 */
>> #define V4L2_PIX_FMT_M420 v4l2_fourcc('M', '4', '2', '0') /* 12 YUV 4:2:0
>2 lines y, 1 line uv interleaved */
>> +#define V4L2_PIX_FMT_YUYV64_12 v4l2_fourcc('Y', '2', '1', '2') /* 32 YUYV
>12-bit per component */
>
>It seems Y212 is already added with the same fourcc code, causing build
>errors:
>
>drivers/media/v4l2-core/v4l2-ioctl.c: In function ‘v4l_fill_fmtdesc’:
>drivers/media/v4l2-core/v4l2-ioctl.c:1455:9: error: duplicate case value
> 1455 | case V4L2_PIX_FMT_Y212: descr = "12-bit YUYV
>Packed"; break;
> | ^~~~
>drivers/media/v4l2-core/v4l2-ioctl.c:1349:9: note: previously used here
> 1349 | case V4L2_PIX_FMT_YUYV64_12: descr = "12-bit Depth
>YUYV 4:2:2"; break;
> | ^~~~
>
>Regards,
>Mirela

Hi Mirela,
Would you please double check it?
The format V4L2_PIX_FMT_Y212 was added by the first version of this patchset, and it should be replaced by
V4L2_PIX_FMT_YUYV64_12 in this v3 patchset.
And I checked my patch, and my local environment, I didn't found any V4L2_PIX_FMT_Y212, and I didn't meet this build error

Ming

>>
>> /* two planes -- one Y, one Cr + Cb interleaved */
>> #define V4L2_PIX_FMT_NV12 v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr
>4:2:0 */