[PATCH v1 1/2] libcamera: formats: Add RGB48 formats

[Jacopo Mondi]

Hi Naush

On Thu, Feb 15, 2024 at 01:27:09PM +0000, Naushir Patuck wrote:
> 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          |  4 ++++
>  src/libcamera/formats.cpp          | 20 ++++++++++++++++++++
>  src/libcamera/formats.yaml         |  5 +++++
>  src/libcamera/v4l2_pixelformat.cpp |  4 ++++
>  5 files changed, 37 insertions(+)
>
> diff --git a/include/linux/drm_fourcc.h b/include/linux/drm_fourcc.h
> index d6c83d9c49f4..4ee421b95730 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') /* [48:0] R:G:B 16:16:16 little endian */
> +#define DRM_FORMAT_BGR161616	fourcc_code('B', 'G', '4', '8') /* [48:0] R:G:B 16:16:16 little endian */
> +
>  /* 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..ba48d2c89726 100644
> --- a/include/linux/videodev2.h
> +++ b/include/linux/videodev2.h
> @@ -557,6 +557,10 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_BGR48_12    v4l2_fourcc('B', '3', '1', '2') /* 48  BGR 12-bit per component */
>  #define V4L2_PIX_FMT_ABGR64_12   v4l2_fourcc('B', '4', '1', '2') /* 64  BGRA 12-bit per component */
>
> +/* RGB formats (6 bytes per pixel) */
> +#define V4L2_PIX_FMT_BGR48 v4l2_fourcc('B', 'G', 'R', '6') /* 16  BGR-16-16-16 */
> +#define V4L2_PIX_FMT_RGB48 v4l2_fourcc('R', 'G', 'B', '6') /* 16  RGB-16-16-16 */
> +
>  /* Grey formats */
>  #define V4L2_PIX_FMT_GREY    v4l2_fourcc('G', 'R', 'E', 'Y') /*  8  Greyscale     */
>  #define V4L2_PIX_FMT_Y4      v4l2_fourcc('Y', '0', '4', ' ') /*  4  Greyscale     */
> diff --git a/src/libcamera/formats.cpp b/src/libcamera/formats.cpp
> index 8a606a7c37f1..a674f4179cc8 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 = 24,

Shouldn't this be 48 as well ?

> +		.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
>