libcamera: Add support for planar YUV422 and YUV420 formats

These formats can be helpful when downstream applications or libraries
support them natively (avoiding a costly conversion).

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Tested-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/formats.cpp

@@ -270,6 +270,20 @@ const std::map<PixelFormat, PixelFormatInfo> pixelFormatInfo{
 		.colourEncoding = PixelFormatInfo::ColourEncodingYUV,
 		.packed = false,
 	} },
+	{ formats::YUV420, {
+		.format = PixelFormat(formats::YUV420),
+		.v4l2Format = V4L2PixelFormat(V4L2_PIX_FMT_YUV420),
+		.bitsPerPixel = 12,
+		.colourEncoding = PixelFormatInfo::ColourEncodingYUV,
+		.packed = false,
+	} },
+	{ formats::YUV422, {
+		.format = PixelFormat(formats::YUV422),
+		.v4l2Format = V4L2PixelFormat(V4L2_PIX_FMT_YUV422P),
+		.bitsPerPixel = 16,
+		.colourEncoding = PixelFormatInfo::ColourEncodingYUV,
+		.packed = false,
+	} },
 
 	/* Greyscale formats. */
 	{ formats::R8, {

src/libcamera/formats.yaml

@@ -53,6 +53,11 @@ formats:
   - NV42:
       fourcc: DRM_FORMAT_NV42
 
+  - YUV420:
+      fourcc: DRM_FORMAT_YUV420
+  - YUV422:
+      fourcc: DRM_FORMAT_YUV422
+
   - MJPEG:
       fourcc: DRM_FORMAT_MJPEG
 

src/libcamera/v4l2_pixelformat.cpp

@@ -63,6 +63,8 @@ const std::map<V4L2PixelFormat, PixelFormat> vpf2pf{
 	{ V4L2PixelFormat(V4L2_PIX_FMT_NV61), formats::NV61 },
 	{ V4L2PixelFormat(V4L2_PIX_FMT_NV12), formats::NV12 },
 	{ V4L2PixelFormat(V4L2_PIX_FMT_NV21), formats::NV21 },
+	{ V4L2PixelFormat(V4L2_PIX_FMT_YUV420), formats::YUV420 },
+	{ V4L2PixelFormat(V4L2_PIX_FMT_YUV422P), formats::YUV422 },
 
 	/* Greyscale formats. */
 	{ V4L2PixelFormat(V4L2_PIX_FMT_GREY), formats::R8 },