linux-kernel - Re: [PATCH v2] media: doc: pixfmt-yuv: Fix 4:4:4 subsampling info

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Date:   Mon, 25 Jan 2021 16:15:17 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Helen Koike <helen.koike@...labora.com>
Cc:     linux-media@...r.kernel.org, hverkuil@...all.nl,
        hans.verkuil@...co.com, kernel@...labora.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: doc: pixfmt-yuv: Fix 4:4:4 subsampling info

Hi Helen,

Thank you for the patch.

On Mon, Jan 25, 2021 at 11:10:29AM -0300, Helen Koike wrote:
> YUV 4:4:4 is not subsampled, fix this in the docs.
> 
> Fixes: da785536e007 ("media: doc: pixfmt-yuv: Move all semi-planar YUV formats to common file")
> Signed-off-by: Helen Koike <helen.koike@...labora.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> Changes in v2:
> 
> - s/No sub-sampling/The chroma plane is not subsampled/ (Laurent)
> - Fixed description regarding the number of bytes (Laurent)
> ---
>  Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> index 7d4d39201a3f..1e0db602cc1b 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst
> @@ -396,9 +396,9 @@ number of lines as the luma plane.
>  NV24 and NV42
>  -------------
>  
> -Semi-planar YUV 4:4:4 formats. The chroma plane is subsampled by 2 in the
> -horizontal direction. Chroma lines contain half the number of pixels and the
> -same number of bytes as luma lines, and the chroma plane contains the same
> +Semi-planar YUV 4:4:4 formats. The chroma plane is not subsampled.
> +Chroma lines contain the same number of pixels and twice the
> +number of bytes as luma lines, and the chroma plane contains the same
>  number of lines as the luma plane.
>  
>  .. flat-table:: Sample 4x4 NV24 Image

-- 
Regards,

Laurent Pinchart