On date Monday 2024-01-08 09:53:37 -0500, Jeffrey Knockel wrote:
> Previously the description was partially mistaken, explaining the format
> 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). The corresponding bit
> masks are red: 0xE0, green: 0x1C, blue: 0x03.
>
> Signed-off-by: Jeffrey Knockel <j...@jeffreyknockel.com>
> ---
> libavutil/pixfmt.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> 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)
This is not consistent with pixdesc definition:
[AV_PIX_FMT_RGB8] = {
.name = "rgb8",
.nb_components = 3,
.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 */
},
.flags = AV_PIX_FMT_FLAG_RGB,
},
so either the documentation or the pixdesc description is wrong.
Do you confirm "(msb)3R 3G 2B(lsb)" is the correct definition?
In this case pixdesc should be fixed accordingly.
Thanks.
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