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

[Naushir Patuck]

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,
+		.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