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Message-ID: <60a9c660-16cd-8f5b-8626-be34e8977781@xs4all.nl>
Date:   Thu, 19 May 2022 08:57:08 +0200
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Subject: Re: [PATCH v4] media: Add P010 video format
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To:     Benjamin Gaignard <benjamin.gaignard@collabora.com>,
        ezequiel@vanguardiasur.com.ar, p.zabel@pengutronix.de,
        mchehab@kernel.org, gregkh@linuxfoundation.org,
        shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com,
        linux-imx@nxp.com, heiko@sntech.de, wens@csie.org,
        jernej.skrabec@gmail.com, samuel@sholland.org
Cc:     kernel@pengutronix.de, linux-media@vger.kernel.org,
        linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-sunxi@lists.linux.dev, kernel@collabora.com,
        Nicolas Dufresne <nicolas.dufresne@collabora.com>
References: <20220518132105.629797-1-benjamin.gaignard@collabora.com>
From:   Hans Verkuil <hverkuil@xs4all.nl>
In-Reply-To: <20220518132105.629797-1-benjamin.gaignard@collabora.com>
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Precedence: bulk

Hi Benjamin,

On 5/18/22 15:21, Benjamin Gaignard wrote:
> P010 is a YUV format with 16-bits per pixel with interleaved UV.

That should be: "10 bits per component"

> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> Acked-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
> ---
> version 4:
> - Fix 10-bits per components wording.
> 
> version 3:
> - remove LE suffix
> - rebased on media_tree_master branch
> 
>  .../media/v4l/pixfmt-yuv-planar.rst           | 54 +++++++++++++++++++
>  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, 57 insertions(+)
> 
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> index 8dff5906639b..a900ff66911a 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> @@ -109,6 +109,13 @@ All components are stored with the same number of bits per component.
>        - Cb, Cr
>        - No
>        - 16x16 tiles
> +    * - V4L2_PIX_FMT_P010
> +      - 'P010'
> +      - 10
> +      - 4:2:0
> +      - Cb, Cr
> +      - Yes
> +      - Linear
>      * - V4L2_PIX_FMT_NV16
>        - 'NV16'
>        - 8
> @@ -171,6 +178,7 @@ horizontally.
>  .. _V4L2-PIX-FMT-NV21:
>  .. _V4L2-PIX-FMT-NV12M:
>  .. _V4L2-PIX-FMT-NV21M:
> +.. _V4L2-PIX-FMT-P010:
>  
>  NV12, NV21, NV12M and NV21M
>  ---------------------------
> @@ -519,6 +527,52 @@ number of lines as the luma plane.
>        - Cb\ :sub:`33`
>        - Cr\ :sub:`33`
>  
> +.. _V4L2_PIX_FMT_P010:
> +
> +P010
> +----
> +
> +Like NV12 with 10 bits per component, expanded to 16 bits.
> +Data in the 10 high bits, zeros in the 6 low bits, arranged in little endian order.
> +
> +.. flat-table:: Sample 4x4 P010 Image
> +    :header-rows:  0
> +    :stub-columns: 0
> +
> +    * - start + 0:
> +      - Y'\ :sub:`00`
> +      - Y'\ :sub:`01`
> +      - Y'\ :sub:`02`
> +      - Y'\ :sub:`03`
> +    * - start + 8:
> +      - Y'\ :sub:`10`
> +      - Y'\ :sub:`11`
> +      - Y'\ :sub:`12`
> +      - Y'\ :sub:`13`
> +    * - start + 16:
> +      - Y'\ :sub:`20`
> +      - Y'\ :sub:`21`
> +      - Y'\ :sub:`22`
> +      - Y'\ :sub:`23`
> +    * - start + 24:
> +      - Y'\ :sub:`30`
> +      - Y'\ :sub:`31`
> +      - Y'\ :sub:`32`
> +      - Y'\ :sub:`33`
> +    * - start + 32:
> +      - Cb\ :sub:`00`
> +      - Cr\ :sub:`00`
> +      - Cb\ :sub:`01`
> +      - Cr\ :sub:`01`
> +    * - start + 40:
> +      - Cb\ :sub:`10`
> +      - Cr\ :sub:`10`
> +      - Cb\ :sub:`11`
> +      - Cr\ :sub:`11`
> +
> +.. raw:: latex
> +
> +    \endgroup
>  
>  Fully Planar YUV Formats
>  ========================
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> index df34b2a283bc..1e38ad8906a2 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -266,6 +266,7 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
>  		{ .format = V4L2_PIX_FMT_NV61,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
>  		{ .format = V4L2_PIX_FMT_NV24,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
>  		{ .format = V4L2_PIX_FMT_NV42,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
> +		{ .format = V4L2_PIX_FMT_P010,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
>  
>  		{ .format = V4L2_PIX_FMT_YUV410,  .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
>  		{ .format = V4L2_PIX_FMT_YVU410,  .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index e2636539c9db..536aaeb4df82 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1305,6 +1305,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_PIX_FMT_NV61:		descr = "Y/CrCb 4:2:2"; break;
>  	case V4L2_PIX_FMT_NV24:		descr = "Y/CbCr 4:4:4"; break;
>  	case V4L2_PIX_FMT_NV42:		descr = "Y/CrCb 4:4:4"; break;
> +	case V4L2_PIX_FMT_P010:		descr = "10-bit Y/CrCb 4:2:0"; break;
>  	case V4L2_PIX_FMT_NV12_4L4:	descr = "Y/CbCr 4:2:0 (4x4 Linear)"; break;
>  	case V4L2_PIX_FMT_NV12_16L16:	descr = "Y/CbCr 4:2:0 (16x16 Linear)"; break;
>  	case V4L2_PIX_FMT_NV12_32L32:   descr = "Y/CbCr 4:2:0 (32x32 Linear)"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 6d465dc443b7..311f106bbdf5 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -601,6 +601,7 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_NV61    v4l2_fourcc('N', 'V', '6', '1') /* 16  Y/CrCb 4:2:2  */
>  #define V4L2_PIX_FMT_NV24    v4l2_fourcc('N', 'V', '2', '4') /* 24  Y/CbCr 4:4:4  */
>  #define V4L2_PIX_FMT_NV42    v4l2_fourcc('N', 'V', '4', '2') /* 24  Y/CrCb 4:4:4  */
> +#define V4L2_PIX_FMT_P010    v4l2_fourcc('P', '0', '1', '0') /* 16  Y/CbCr 4:2:0 16-bit per pixel */

As discussed on irc, this should be:

/* 24  Y/CbCr 4:2:0 10-bit per pixel */

Regards,

	Hans

>  
>  /* two non contiguous planes - one Y, one Cr + Cb interleaved  */
>  #define V4L2_PIX_FMT_NV12M   v4l2_fourcc('N', 'M', '1', '2') /* 12  Y/CbCr 4:2:0  */