Re: [FFmpeg-devel] [PATCH v2] avutil/pixfmt: fix AV_PIX_FMT_RGB8 description

["Diederick C. Niehorster" <dcnieho@gmail.com>]

On Sun, Jan 14, 2024 at 4:15 PM Jeffrey Knockel <jeff@jeffreyknockel.com> wrote:
>
> Previously AV_PIX_FMT_RGB8 was documented as "RGB 3:3:2,
> (msb)2R 3G 3B(lsb)".  While the RGB 3:3:2 part is correct, the latter
> part should be: (msb)3R 3G 2B(lsb).  This commit also updates the
> format's pixdesc description to be (msb)3R 3G 2B(lsb).
>
> Signed-off-by: Jeffrey Knockel <jeff@jeffreyknockel.com>
> ---
>  libavutil/pixdesc.c | 6 +++---
>  libavutil/pixfmt.h  | 2 +-
>  2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/libavutil/pixdesc.c b/libavutil/pixdesc.c
> index 0db4167934..f6d4d01460 100644
> --- a/libavutil/pixdesc.c
> +++ b/libavutil/pixdesc.c
> @@ -530,9 +530,9 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
>          .log2_chroma_w = 0,
>          .log2_chroma_h = 0,
>          .comp = {
> -            { 0, 1, 0, 6, 2 },        /* R */
> -            { 0, 1, 0, 3, 3 },        /* G */
> -            { 0, 1, 0, 0, 3 },        /* B */
> +            { 0, 1, 0, 5, 3 },        /* R */
> +            { 0, 1, 0, 2, 3 },        /* G */
> +            { 0, 1, 0, 0, 2 },        /* B */
>          },
>          .flags = AV_PIX_FMT_FLAG_RGB,
>      },
> diff --git a/libavutil/pixfmt.h b/libavutil/pixfmt.h
> index 58f9ad28bd..9c87571f49 100644
> --- a/libavutil/pixfmt.h
> +++ b/libavutil/pixfmt.h
> @@ -83,7 +83,7 @@ enum AVPixelFormat {
>      AV_PIX_FMT_BGR8,      ///< packed RGB 3:3:2,  8bpp, (msb)2B 3G 3R(lsb)
>      AV_PIX_FMT_BGR4,      ///< packed RGB 1:2:1 bitstream,  4bpp, (msb)1B 2G 1R(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bits
>      AV_PIX_FMT_BGR4_BYTE, ///< packed RGB 1:2:1,  8bpp, (msb)1B 2G 1R(lsb)
> -    AV_PIX_FMT_RGB8,      ///< packed RGB 3:3:2,  8bpp, (msb)2R 3G 3B(lsb)
> +    AV_PIX_FMT_RGB8,      ///< packed RGB 3:3:2,  8bpp, (msb)3R 3G 2B(lsb)
>      AV_PIX_FMT_RGB4,      ///< packed RGB 1:2:1 bitstream,  4bpp, (msb)1R 2G 1B(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bits
>      AV_PIX_FMT_RGB4_BYTE, ///< packed RGB 1:2:1,  8bpp, (msb)1R 2G 1B(lsb)
>      AV_PIX_FMT_NV12,      ///< planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (first byte U and the following byte V)
> --
> 2.34.1

LGTM.
Tested. Without this patch, the output of avutil av_read_image_line2()
is all wrong, with it applied it is correct.

All the best,
Dee
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