[PATCH v2 1/6] libcamera: formats: Add RGB48 formats

[Kieran Bingham]

Quoting Naushir Patuck (2024-05-08 09:03:56)
> Add support for 16-bps (48-bpp) RGB output formats. These new formats
> are define for the RGB and BGR ordering.
> 
> Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
> ---
>  include/linux/drm_fourcc.h         |  4 ++++
>  include/linux/videodev2.h          |  2 ++
>  src/libcamera/formats.cpp          | 20 ++++++++++++++++++++
>  src/libcamera/formats.yaml         |  5 +++++
>  src/libcamera/v4l2_pixelformat.cpp |  4 ++++
>  5 files changed, 35 insertions(+)
> 
> diff --git a/include/linux/drm_fourcc.h b/include/linux/drm_fourcc.h
> index d6c83d9c49f4..5133a6551a34 100644
> --- a/include/linux/drm_fourcc.h
> +++ b/include/linux/drm_fourcc.h
> @@ -210,6 +210,10 @@ extern "C" {
>  #define DRM_FORMAT_RGBA1010102 fourcc_code('R', 'A', '3', '0') /* [31:0] R:G:B:A 10:10:10:2 little endian */
>  #define DRM_FORMAT_BGRA1010102 fourcc_code('B', 'A', '3', '0') /* [31:0] B:G:R:A 10:10:10:2 little endian */
>  
> +/* 48 bpp RGB */
> +#define DRM_FORMAT_RGB161616 fourcc_code('R', 'G', '4', '8') /* [47:0] R:G:B 16:16:16 little endian */
> +#define DRM_FORMAT_BGR161616 fourcc_code('B', 'G', '4', '8') /* [47:0] B:G:R 16:16:16 little endian */
> +

Looks like we're working out who can push the corresponding change for this upstream, so I think this is fine with me.


Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>

>  /* 64 bpp RGB */
>  #define DRM_FORMAT_XRGB16161616        fourcc_code('X', 'R', '4', '8') /* [63:0] x:R:G:B 16:16:16:16 little endian */
>  #define DRM_FORMAT_XBGR16161616        fourcc_code('X', 'B', '4', '8') /* [63:0] x:B:G:R 16:16:16:16 little endian */
> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
> index 7e556911c9e1..4fdd91494041 100644
> --- a/include/linux/videodev2.h
> +++ b/include/linux/videodev2.h
> @@ -555,6 +555,8 @@ struct v4l2_pix_format {
>  
>  /* RGB formats (6 or 8 bytes per pixel) */
>  #define V4L2_PIX_FMT_BGR48_12    v4l2_fourcc('B', '3', '1', '2') /* 48  BGR 12-bit per component */
> +#define V4L2_PIX_FMT_BGR48       v4l2_fourcc('B', 'G', 'R', '6') /* 48  BGR 16-bit per component */
> +#define V4L2_PIX_FMT_RGB48       v4l2_fourcc('R', 'G', 'B', '6') /* 48  RGB 16-bit per component */
>  #define V4L2_PIX_FMT_ABGR64_12   v4l2_fourcc('B', '4', '1', '2') /* 64  BGRA 12-bit per component */
>  
>  /* Grey formats */
> diff --git a/src/libcamera/formats.cpp b/src/libcamera/formats.cpp
> index 955c3fba8b8d..21a7719e84c4 100644
> --- a/src/libcamera/formats.cpp
> +++ b/src/libcamera/formats.cpp
> @@ -270,6 +270,26 @@ const std::map<PixelFormat, PixelFormatInfo> pixelFormatInfo{
>                 .pixelsPerGroup = 1,
>                 .planes = {{ { 4, 1 }, { 0, 0 }, { 0, 0 } }},
>         } },
> +       { formats::BGR161616, {
> +               .name = "BGR161616",
> +               .format = formats::BGR161616,
> +               .v4l2Formats = { V4L2PixelFormat(V4L2_PIX_FMT_RGB48), },
> +               .bitsPerPixel = 48,
> +               .colourEncoding = PixelFormatInfo::ColourEncodingRGB,
> +               .packed = false,
> +               .pixelsPerGroup = 1,
> +               .planes = {{ { 3, 1 }, { 0, 0 }, { 0, 0 } }},
> +       } },
> +       { formats::RGB161616, {
> +               .name = "RGB161616",
> +               .format = formats::RGB161616,
> +               .v4l2Formats = { V4L2PixelFormat(V4L2_PIX_FMT_BGR48), },
> +               .bitsPerPixel = 48,
> +               .colourEncoding = PixelFormatInfo::ColourEncodingRGB,
> +               .packed = false,
> +               .pixelsPerGroup = 1,
> +               .planes = {{ { 3, 1 }, { 0, 0 }, { 0, 0 } }},
> +       } },
>  
>         /* YUV packed formats. */
>         { formats::YUYV, {
> diff --git a/src/libcamera/formats.yaml b/src/libcamera/formats.yaml
> index d8a379923b56..bde2cc803b98 100644
> --- a/src/libcamera/formats.yaml
> +++ b/src/libcamera/formats.yaml
> @@ -43,6 +43,11 @@ formats:
>    - BGRA8888:
>        fourcc: DRM_FORMAT_BGRA8888
>  
> +  - RGB161616:
> +      fourcc: DRM_FORMAT_RGB161616
> +  - BGR161616:
> +      fourcc: DRM_FORMAT_BGR161616
> +
>    - YUYV:
>        fourcc: DRM_FORMAT_YUYV
>    - YVYU:
> diff --git a/src/libcamera/v4l2_pixelformat.cpp b/src/libcamera/v4l2_pixelformat.cpp
> index 731dc10f1d73..efb6f2940235 100644
> --- a/src/libcamera/v4l2_pixelformat.cpp
> +++ b/src/libcamera/v4l2_pixelformat.cpp
> @@ -71,6 +71,10 @@ const std::map<V4L2PixelFormat, V4L2PixelFormat::Info> vpf2pf{
>                 { formats::BGRA8888, "32-bit ARGB 8-8-8-8" } },
>         { V4L2PixelFormat(V4L2_PIX_FMT_BGRA32),
>                 { formats::RGBA8888, "32-bit ABGR 8-8-8-8" } },
> +       { V4L2PixelFormat(V4L2_PIX_FMT_RGB48),
> +               { formats::BGR161616, "48-bit RGB 16-16-16" } },
> +       { V4L2PixelFormat(V4L2_PIX_FMT_BGR48),
> +               { formats::RGB161616, "48-bit BGR 16-16-16" } },
>  
>         /* YUV packed formats. */
>         { V4L2PixelFormat(V4L2_PIX_FMT_YUYV),
> -- 
> 2.34.1
>