2.13.2. V4L2_META_FMT_GENERIC_8 (‘MET8’), V4L2_META_FMT_GENERIC_CSI2_10 (‘MC1A’), V4L2_META_FMT_GENERIC_CSI2_12 (‘MC1C’), V4L2_META_FMT_GENERIC_CSI2_14 (‘MC1E’), V4L2_META_FMT_GENERIC_CSI2_16 (‘MC1G’), V4L2_META_FMT_GENERIC_CSI2_20 (‘MC1K’), V4L2_META_FMT_GENERIC_CSI2_24 (‘MC1O’)

Generic line-based metadata formats

2.13.2.1. Description

These generic line-based metadata formats define the memory layout of the data without defining the format or meaning of the metadata itself.

2.13.2.1.1. V4L2_META_FMT_GENERIC_8

The V4L2_META_FMT_GENERIC_8 format is a plain 8-bit metadata format. This format is used on CSI-2 for 8 bits per Data Unit.

Additionally it is used for 16 bits per Data Unit when two bytes of metadata are packed into one 16-bit Data Unit. Otherwise the 16 bits per pixel dataformat is V4L2_META_FMT_GENERIC_CSI2_16.

Byte Order Of V4L2_META_FMT_GENERIC_8. Each cell is one byte. “M” denotes a byte of metadata.

Sample 4x2 Metadata Frame

start + 0:	M00	M10	M20	M30
start + 4:	M01	M11	M21	M31

2.13.2.1.2. V4L2_META_FMT_GENERIC_CSI2_10

V4L2_META_FMT_GENERIC_CSI2_10 contains 8-bit generic metadata packed in 10-bit Data Units, with one padding byte after every four bytes of metadata. This format is typically used by CSI-2 receivers with a source that transmits MEDIA_BUS_FMT_META_10 and the CSI-2 receiver writes the received data to memory as-is.

The packing of the data follows the MIPI CSI-2 specification and the padding of the data is defined in the MIPI CCS specification.

This format is also used in conjunction with 20 bits per Data Unit formats that pack two bytes of metadata into one Data Unit. Otherwise the 20 bits per pixel dataformat is V4L2_META_FMT_GENERIC_CSI2_20.

This format is little endian.

Byte Order Of V4L2_META_FMT_GENERIC_CSI2_10. Each cell is one byte. “M” denotes a byte of metadata and “x” a byte of padding.

Sample 4x2 Metadata Frame

start + 0:	M00	M10	M20	M30	x
start + 5:	M01	M11	M21	M31	x

2.13.2.1.3. V4L2_META_FMT_GENERIC_CSI2_12

V4L2_META_FMT_GENERIC_CSI2_12 contains 8-bit generic metadata packed in 12-bit Data Units, with one padding byte after every two bytes of metadata. This format is typically used by CSI-2 receivers with a source that transmits MEDIA_BUS_FMT_META_12 and the CSI-2 receiver writes the received data to memory as-is.

The packing of the data follows the MIPI CSI-2 specification and the padding of the data is defined in the MIPI CCS specification.

This format is also used in conjunction with 24 bits per Data Unit formats that pack two bytes of metadata into one Data Unit. Otherwise the 24 bits per pixel dataformat is V4L2_META_FMT_GENERIC_CSI2_24.

This format is little endian.

Byte Order Of V4L2_META_FMT_GENERIC_CSI2_12. Each cell is one byte. “M” denotes a byte of metadata and “x” a byte of padding.

Sample 4x2 Metadata Frame

start + 0:	M00	M10	x	M20	M30	x
start + 6:	M01	M11	x	M21	M31	x

2.13.2.1.4. V4L2_META_FMT_GENERIC_CSI2_14

V4L2_META_FMT_GENERIC_CSI2_14 contains 8-bit generic metadata packed in 14-bit Data Units, with three padding bytes after every four bytes of metadata. This format is typically used by CSI-2 receivers with a source that transmits MEDIA_BUS_FMT_META_14 and the CSI-2 receiver writes the received data to memory as-is.

The packing of the data follows the MIPI CSI-2 specification and the padding of the data is defined in the MIPI CCS specification.

This format is little endian.

Byte Order Of V4L2_META_FMT_GENERIC_CSI2_14. Each cell is one byte. “M” denotes a byte of metadata and “x” a byte of padding.

Sample 4x2 Metadata Frame

start + 0:	M00	M10	M20	M30	x	x	x
start + 7:	M01	M11	M21	M31	x	x	x

2.13.2.1.5. V4L2_META_FMT_GENERIC_CSI2_16

V4L2_META_FMT_GENERIC_CSI2_16 contains 8-bit generic metadata packed in 16-bit Data Units, with one padding byte after every byte of metadata. This format is typically used by CSI-2 receivers with a source that transmits MEDIA_BUS_FMT_META_16 and the CSI-2 receiver writes the received data to memory as-is.

The packing of the data follows the MIPI CSI-2 specification and the padding of the data is defined in the MIPI CCS specification.

Some devices support more efficient packing of metadata in conjunction with 16-bit image data. In that case the dataformat is V4L2_META_FMT_GENERIC_8.

This format is little endian.

Byte Order Of V4L2_META_FMT_GENERIC_CSI2_16. Each cell is one byte. “M” denotes a byte of metadata and “x” a byte of padding.

Sample 4x2 Metadata Frame

start + 0:	M00	x	M10	x	M20	x	M30	x
start + 8:	M01	x	M11	x	M21	x	M31	x

2.13.2.1.6. V4L2_META_FMT_GENERIC_CSI2_20

V4L2_META_FMT_GENERIC_CSI2_20 contains 8-bit generic metadata packed in 20-bit Data Units, with alternating one or two padding bytes after every byte of metadata. This format is typically used by CSI-2 receivers with a source that transmits MEDIA_BUS_FMT_META_20 and the CSI-2 receiver writes the received data to memory as-is.

The packing of the data follows the MIPI CSI-2 specification and the padding of the data is defined in the MIPI CCS specification.

Some devices support more efficient packing of metadata in conjunction with 16-bit image data. In that case the dataformat is V4L2_META_FMT_GENERIC_CSI2_10.

This format is little endian.

Byte Order Of V4L2_META_FMT_GENERIC_CSI2_20. Each cell is one byte. “M” denotes a byte of metadata and “x” a byte of padding.

Sample 4x2 Metadata Frame

start + 0:	M00	x	M10	x	x	M20	x	M30	x	x
start + 10:	M01	x	M11	x	x	M21	x	M31	x	x

2.13.2.1.7. V4L2_META_FMT_GENERIC_CSI2_24

V4L2_META_FMT_GENERIC_CSI2_24 contains 8-bit generic metadata packed in 24-bit Data Units, with two padding bytes after every byte of metadata. This format is typically used by CSI-2 receivers with a source that transmits MEDIA_BUS_FMT_META_24 and the CSI-2 receiver writes the received data to memory as-is.

The packing of the data follows the MIPI CSI-2 specification and the padding of the data is defined in the MIPI CCS specification.

Some devices support more efficient packing of metadata in conjunction with 16-bit image data. In that case the dataformat is V4L2_META_FMT_GENERIC_CSI2_12.

This format is little endian.

Byte Order Of V4L2_META_FMT_GENERIC_CSI2_24. Each cell is one byte. “M” denotes a byte of metadata and “x” a byte of padding.

Sample 4x2 Metadata Frame

start + 0:

M00

x

x

M10

x

x

M20

x

x

M30

x

x

start + 12:

M01

x

x

M11

x

x

M21

x

x

M31

x

x