Data Layout

group NVCV_C_CORE_DATALAYOUT

Defines

NVCV_MAX_CHANNEL_COUNT: Maximum channel count

NVCV_MAX_EXTRA_CHANNEL_COUNT

NVCV_MAX_SWIZZLE_COUNT

Enums

enum NVCVPacking

Defines how channels are packed into an image plane element.

Packing encodes how many channels the plane element has, and how they are arranged in memory.

Up to 4 channels (denoted by X, Y, Z, W) can be packed into an image plane element, each one occupying a specified number of bits.

When two channels are specified one right after the other, they are ordered from most-significant bit to least-significant bit. Words are separated by underscores. For example:

X8Y8Z8W8 = a single 32-bit word containing 4 channels, 8 bits each.

In little-endian architectures:

In big-endian architectures:

X8_Y8_Z8_W8 = four consecutive 8-bit words, corresponding to 4 channels, 8 bits each.

In little-endian architectures:

In big-endian architectures:

In cases where a word is less than 8 bits (e.g., X1 1-bit channel), channels are ordered from LSB to MSB within a word.

Some formats allow different packings when pixels’ horizontal coordinate is even or odd. For instance, every pixel of YUV422 packed format contains an Y channel, while only even pixels contain the U channel, and odd pixels contain V channel. Such formats use a double-underscore to separate the even pixels from the odd pixels. The packing just described might be referred to X8_Y8__X8_Z8, where X = luma, Y = U chroma, Z = V chroma.

Note

Also note equivalences such as the following:

Note

In little-endian: X8_Y8_Z8_W8 = W8Z8Y8X8.

Note

In big-endian: X8_Y8_Z8_W8 = X8Y8Z8W8.

Values:

enumerator NVCV_PACKING_0: No channels.

enumerator NVCV_PACKING_X1: One 1-bit channel.

enumerator NVCV_PACKING_X2: One 2-bit channel.

enumerator NVCV_PACKING_X4: One 4-bit channel.

enumerator NVCV_PACKING_X8: One 8-bit channel.

enumerator NVCV_PACKING_b4X4: One LSB 4-bit channel in a 8-bit word

enumerator NVCV_PACKING_X4b4: One MSB 4-bit channel in a 8-bit word

enumerator NVCV_PACKING_X4Y4: Two 4-bit channels in one 8-bit word.

enumerator NVCV_PACKING_X3Y3Z2: Three 3-, 3- and 2-bit channels in one 8-bit word.

enumerator NVCV_PACKING_X16: One 16-bit channel.

enumerator NVCV_PACKING_b6X10: One LSB 10-bit channel in one 16-bit word.

enumerator NVCV_PACKING_X10b6: One MSB 10-bit channel in one 16-bit word.

enumerator NVCV_PACKING_b4X12: One LSB 12-bit channel in one 16-bit word.

enumerator NVCV_PACKING_X12b4: One MSB 12-bit channel in one 16-bit word.

enumerator NVCV_PACKING_b2X14: One LSB 14-bit channel in one 16-bit word.

enumerator NVCV_PACKING_X14b2: One MSB 14-bit channel in one 16-bit word.

enumerator NVCV_PACKING_X8_Y8: Two 8-bit channels in two 8-bit words.

enumerator NVCV_PACKING_X5Y5Z6: Three 5-, 5- and 6-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X5Y6Z5: Three 5-, 6- and 5-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X6Y5Z5: Three 6-, 5- and 5-bit channels in one 16-bit word.

enumerator NVCV_PACKING_b4X4Y4Z4: Three 4-bit channels in one 16-bit word.

enumerator NVCV_PACKING_b1X5Y5Z5: Three 5-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X5Y5b1Z5: Three 5-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X1Y5Z5W5: Four 1-, 5-, 5- and 5-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X4Y4Z4W4: Four 4-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X5Y1Z5W5: Four 5-, 1-, 5- and 5-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X5Y5Z1W5: Four 5-, 5-, 1- and 5-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X5Y5Z5W1: Four 5-, 5-, 5- and 1-bit channels in one 16-bit word.

enumerator NVCV_PACKING_X8_Y8__X8_Z8: 2 pixels of 2 8-bit channels each, totalling 4 8-bit words.

enumerator NVCV_PACKING_Y8_X8__Z8_X8: 2 pixels of 2 swapped 8-bit channels each, totalling 4 8-bit words.

enumerator NVCV_PACKING_X24: One 24-bit channel.

enumerator NVCV_PACKING_X8_Y8_Z8: Three 8-bit channels in three 8-bit words.

enumerator NVCV_PACKING_X32: One 32-bit channel.

enumerator NVCV_PACKING_b12X20: One LSB 20-bit channel in one 32-bit word.

enumerator NVCV_PACKING_X20b12: One MSB 20-bit channel in one 32-bit word.

enumerator NVCV_PACKING_X24b8: One MSB 24-bit channel in one 32-bit word.

enumerator NVCV_PACKING_b8X24: One LSB 24-bit channel in one 32-bit word.

enumerator NVCV_PACKING_X16_Y16: Two 16-bit channels in two 16-bit words.

enumerator NVCV_PACKING_X10b6_Y10b6: Two MSB 10-bit channels in two 16-bit words.

enumerator NVCV_PACKING_X12b4_Y12b4: Two MSB 12-bit channels in two 16-bit words.

enumerator NVCV_PACKING_X10Y11Z11: Three 10-, 11- and 11-bit channels in one 32-bit word.

enumerator NVCV_PACKING_X11Y11Z10: Three 11-, 11- and 10-bit channels in one 32-bit word.

enumerator NVCV_PACKING_b2X10Y10Z10: Three LSB 10-bit channels in one 32-bit word.

enumerator NVCV_PACKING_X10Y10Z10b2: Three MSB 10-bit channels in one 32-bit word.

enumerator NVCV_PACKING_X8_Y8_Z8_W8: Four 8-bit channels in one 32-bit word.

enumerator NVCV_PACKING_X2Y10Z10W10: Four 2-, 10-, 10- and 10-bit channels in one 32-bit word.

enumerator NVCV_PACKING_X10Y10Z10W2: Four 10-, 10-, 10- and 2-bit channels in one 32-bit word.

enumerator NVCV_PACKING_X48: One 48-bit channel.

enumerator NVCV_PACKING_X16_Y16_Z16: Three 16-bit channels in three 16-bit words.

enumerator NVCV_PACKING_X64: One 64-bit channel.

enumerator NVCV_PACKING_X32_Y32: Two 32-bit channels in two 32-bit words.

enumerator NVCV_PACKING_X32_Y24b8: Two channels: 32-bit in a 32-bit word, 24-bit MSB in a 32-bit word

enumerator NVCV_PACKING_X16_Y16_Z16_W16: Four 16-bit channels in one 64-bit word.

enumerator NVCV_PACKING_X96: One 96-bit channel.

enumerator NVCV_PACKING_X32_Y32_Z32: Three 32-bit channels in three 32-bit words.

enumerator NVCV_PACKING_X128: One 128-bit channel.

enumerator NVCV_PACKING_X64_Y64: Two 64-bit channels in two 64-bit words.

enumerator NVCV_PACKING_X32_Y32_Z32_W32: Four 32-bit channels in three 32-bit words.

enumerator NVCV_PACKING_X192: One 192-bit channel.

enumerator NVCV_PACKING_X64_Y64_Z64: Three 64-bit channels in three 64-bit words.

enumerator NVCV_PACKING_X256: One 256-bit channel.

enumerator NVCV_PACKING_X128_Y128: Two 128-bit channels in two 128-bit words.

enumerator NVCV_PACKING_X64_Y64_Z64_W64: Four 64-bit channels in four 64-bit words.

enum NVCVDataKind

Defines the channel data type.

Values:

enumerator NVCV_DATA_KIND_UNSPECIFIED: Unspecified data kind.

enumerator NVCV_DATA_KIND_UNSIGNED: Channels are unsigned integer values.

enumerator NVCV_DATA_KIND_SIGNED: Channels are signed integer values.

enumerator NVCV_DATA_KIND_FLOAT: Channels are floating point values.

enumerator NVCV_DATA_KIND_COMPLEX: Channels are complex values.

enum NVCVMemLayout

Defines how the 2D plane pixels are laid out in memory. This defines how a pixel are addressed, i.e., given its \((x,y)\) coordinate, what’s its memory address. Block-linear formats have a proprietary memory representation and aren’t supposed to be addressed by the user directly.

Values:

enumerator NVCV_MEM_LAYOUT_PITCH_LINEAR: Pixels are laid out in row-major order. \((x,y) = y \times \mathit{pitch} + x \times \mathit{pixel stride}\).

enumerator NVCV_MEM_LAYOUT_BLOCK1_LINEAR: Pixels are laid out in block-linear format with height = 1.

enumerator NVCV_MEM_LAYOUT_BLOCK2_LINEAR: Pixels are laid out in block-linear format with height = 2.

enumerator NVCV_MEM_LAYOUT_BLOCK4_LINEAR: Pixels are laid out in block-linear format with height = 4.

enumerator NVCV_MEM_LAYOUT_BLOCK8_LINEAR: Pixels are laid out in block-linear format with height = 8.

enumerator NVCV_MEM_LAYOUT_BLOCK16_LINEAR: Pixels are laid out in block-linear format with height = 16.

enumerator NVCV_MEM_LAYOUT_BLOCK32_LINEAR: Pixels are laid out in block-linear format with height = 32.

enumerator NVCV_MEM_LAYOUT_BLOCK_LINEAR: Default block-linear format. It’s guaranteed to be valid in all algorithms that support block-linear format.

enumerator NVCV_MEM_LAYOUT_PL: Useful aliases.

enumerator NVCV_MEM_LAYOUT_BL

enum NVCVChannel

Defines the format channel names. The channels are color model-agnostic.

Values:

enumerator NVCV_CHANNEL_0: Don’t select a channel.

enumerator NVCV_CHANNEL_X: Selects the first channel of the color model.

enumerator NVCV_CHANNEL_Y: Selects the second channel of the color model.

enumerator NVCV_CHANNEL_Z: Selects the third channel of the color model.

enumerator NVCV_CHANNEL_W: Selects the fourth channel of the color model.

enumerator NVCV_CHANNEL_1: Sets the corresponding channel to have its maximum value.

enum NVCVAlphaType

Defines the kind of alpha channel data present.

Values:

enumerator NVCV_ALPHA_ASSOCIATED: Associated alpha type

enumerator NVCV_ALPHA_UNASSOCIATED: Unassociated alpha type

enum NVCVExtraChannel

Defines the different kinds of extra channels supported.

Values:

enumerator NVCV_EXTRA_CHANNEL_U: Unspecified Channel.

enumerator NVCV_EXTRA_CHANNEL_D: Depth data.

enumerator NVCV_EXTRA_CHANNEL_POS3D: 3D Position data.

enum NVCVSwizzle

Defines the supported channel swizzle operations.

The operations map an input vector \((x,y,z,w)\) into an output vector \((x',y',z',w')\). Any output channel can select any of the input channels, or the constants zero or one. For example, the swizzle “X000” selects the first channel, whereas swizzle “ZYXW” swaps the X and Z channels, needed for conversion between RGBA and BGRA image formats.

Values:

enumerator NVCV_SWIZZLE_0000: Swizzle operation.

enumerator NVCV_SWIZZLE_X000

enumerator NVCV_SWIZZLE_XY00

enumerator NVCV_SWIZZLE_XYZ0

enumerator NVCV_SWIZZLE_XYZW

enumerator NVCV_SWIZZLE_1000

enumerator NVCV_SWIZZLE_0001

enumerator NVCV_SWIZZLE_ZYXW

enumerator NVCV_SWIZZLE_WXYZ

enumerator NVCV_SWIZZLE_WZYX

enumerator NVCV_SWIZZLE_YZWX

enumerator NVCV_SWIZZLE_XYZ1

enumerator NVCV_SWIZZLE_YZW1

enumerator NVCV_SWIZZLE_XXX1

enumerator NVCV_SWIZZLE_XZY1

enumerator NVCV_SWIZZLE_ZYX1

enumerator NVCV_SWIZZLE_ZYX0

enumerator NVCV_SWIZZLE_WZY1

enumerator NVCV_SWIZZLE_0X00

enumerator NVCV_SWIZZLE_00X0

enumerator NVCV_SWIZZLE_000X

enumerator NVCV_SWIZZLE_Y000

enumerator NVCV_SWIZZLE_0Y00

enumerator NVCV_SWIZZLE_00Y0

enumerator NVCV_SWIZZLE_000Y

enumerator NVCV_SWIZZLE_0XY0

enumerator NVCV_SWIZZLE_XXXY

enumerator NVCV_SWIZZLE_YYYX

enumerator NVCV_SWIZZLE_0YX0

enumerator NVCV_SWIZZLE_X00Y

enumerator NVCV_SWIZZLE_Y00X

enumerator NVCV_SWIZZLE_X001

enumerator NVCV_SWIZZLE_XY01

enumerator NVCV_SWIZZLE_0XZ0

enumerator NVCV_SWIZZLE_0ZX0

enumerator NVCV_SWIZZLE_XZY0

enumerator NVCV_SWIZZLE_YZX1

enumerator NVCV_SWIZZLE_ZYW1

enumerator NVCV_SWIZZLE_0YX1

enumerator NVCV_SWIZZLE_XYXZ

enumerator NVCV_SWIZZLE_YXZX

enumerator NVCV_SWIZZLE_XZ00

enumerator NVCV_SWIZZLE_WYXZ

enumerator NVCV_SWIZZLE_YX00

enumerator NVCV_SWIZZLE_YX01

enumerator NVCV_SWIZZLE_00YX

enumerator NVCV_SWIZZLE_00XY

enumerator NVCV_SWIZZLE_0XY1

enumerator NVCV_SWIZZLE_0X01

enumerator NVCV_SWIZZLE_YZXW

enumerator NVCV_SWIZZLE_YW00

enumerator NVCV_SWIZZLE_XYW0

enumerator NVCV_SWIZZLE_YZW0

enumerator NVCV_SWIZZLE_YZ00

enumerator NVCV_SWIZZLE_00X1

enumerator NVCV_SWIZZLE_0ZXY

enumerator NVCV_SWIZZLE_UNSUPPORTED

enum NVCVByteOrder

Byte/bit order of a NVCVPacking value in a word.

Values:

enumerator NVCV_ORDER_LSB: Least significant byte/bit has higher memory address.

enumerator NVCV_ORDER_MSB: Most significant byte/bit has lower memory address.

Functions

NVCV_PUBLIC NVCVStatus nvcvMakeSwizzle (NVCVSwizzle *outSwizzle, NVCVChannel x, NVCVChannel y, NVCVChannel z, NVCVChannel w)

Creates a user-defined NVCVSwizzle operation. This is similar to NVCV_MAKE_SWIZZLE, but accepts the swizzle channels as runtime variables.

Parameters

outSwizzle – [out] Swizzle operation as defined by the given channel order.
x – [in] Channel that will correspond to the first component.
y – [in] Channel that will correspond to the second component.
z – [in] Channel that will correspond to the third component.
w – [in] Channel that will correspond to the fourth component.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvSwizzleGetChannels (NVCVSwizzle swizzle, NVCVChannel *channels)

Get the swizzle channels.

For example, given swizzle NVCV_SWIZZLE_YZWX, it returns NVCV_CHANNEL_Y, NVCV_CHANNEL_Z, NVCV_CHANNEL_W and NVCV_CHANNEL_X.

Parameters

swizzle – [in] Swizzle to be queried.
channels – [out] Output channel array with 4 elements.
- It cannot be NULL.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvSwizzleGetNumChannels (NVCVSwizzle swizzle, int32_t *outNumChannels)

Get the number of channels specified by the given swizzle.

Only the following count as channels:

NVCV_CHANNEL_X
NVCV_CHANNEL_Y
NVCV_CHANNEL_Z
NVCV_CHANNEL_W

Parameters

swizzle – [in] Swizzle to be queried.
outNumChannels – [out] The channel count specified by swizzle.
- It cannot be NULL.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvMakePacking (NVCVPacking *outPacking, const NVCVPackingParams *params)

Returns a pre-defined NVCVPacking given its params.

This function calculates the NVCVPacking based on the channel characteristics at run time.

Parameters

outPacking – [out] The packing enum corresponding to params.
- It cannot be NULL.
params – [in] Packing parameters. If NVCVPackingParams::swizzle is set to NVCV_SWIZZLE_0000 the swizzle will be inferred from NVCVPackingParams::bits. It’ll return the packing with the largest alignment that is smaller or equal the requested alignment. If requested alignment is 0, it’ll return the packing with smallest alignment.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvPackingGetParams (NVCVPacking packing, NVCVPackingParams *outParams)

Returns channels’ information from a format packing.

Parameters

packing – [in] The format packing to be queried.
outParams – [out] The packing parameters.
- It cannot be NULL.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvPackingGetNumComponents (NVCVPacking packing, int32_t *outNumComponents)

Returns the number of components defined by the given packing.

Parameters

packing – [in] The format packing to be queried.
outNumComponents – [out] Number of components from the given format packing. It’s value between 0 and 4.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvPackingGetBitsPerComponent (NVCVPacking packing, int32_t *outBits)

Returns the number of bits per packing component.

Parameters

packing – [in] The format packing to be queried.
bits – [out] Pointer to an int32_t array with 4 elements where output will be stored. Passing NULL is allowed, to which the function simply does nothing.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvPackingGetBitsPerPixel (NVCVPacking packing, int32_t *outBPP)

Returns the number of bits per pixel of the given packing.

Parameters

packing – [in] The format packing to be queried.
outBPP – [out] Total number of bits per pixel of the given packing. It’s the sum of number of bits occupied by all packing channels.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC NVCVStatus nvcvPackingGetAlignment (NVCVPacking packing, int32_t *outAlignment)

Get the required address alignment for the packing.

The returned alignment is guaranteed to be a power-of-two.

Parameters

type – [in] Packing to be queried.
outAlignment – [out] Pointer to an int32_t where the required alignment is to be stored.
- Cannot be NULL.

Return values

NVCV_ERROR_INVALID_ARGUMENT – Some argument is outside its valid range.
NVCV_SUCCESS – Operation executed successfully.

NVCV_PUBLIC const char * nvcvPackingGetName (NVCVPacking fmt)

Returns a string representation of a packing.

Parameters: packing – [in] Packing whose name is to be returned.
Returns: The string representation of the packing. Returned pointer must not be freed.

NVCV_PUBLIC const char * nvcvDataKindGetName (NVCVDataKind dtype)

Returns a string representation of a data type.

Parameters: dtype – [in] Data type whose name is to be returned.
Returns: The string representation of the data type. Returned pointer must not be freed.

NVCV_PUBLIC const char * nvcvMemLayoutGetName (NVCVMemLayout memlayout)

Returns a string representation of a memory layout.

Parameters: memlayout – [in] Memory layout whose name is to be returned.
Returns: The string representation of the memory layout. Returned pointer must not be freed.

NVCV_PUBLIC const char * nvcvChannelGetName (NVCVChannel channel)

Returns a string representation of a channel.

Parameters: channel – [in] Channel whose name is to be returned.
Returns: The string representation of the channel. Returned pointer must not be freed.

NVCV_PUBLIC const char * nvcvSwizzleGetName (NVCVSwizzle swizzle)

Returns a string representation of a swizzle.

Parameters: swizzle – [in] Swizzle whose name is to be returned.
Returns: The string representation of the swizzle. Returned string is valid until next call of this function from the same calling thread. Returned pointer must not be freed.

NVCV_PUBLIC const char * nvcvByteOrderGetName (NVCVByteOrder byteOrder)

Returns a string representation of a byte order.

Parameters: byteOrder – [in] Byte order whose name is to be returned.
Returns: The string representation of the byte order. Returned string is valid until next call of this function from the same calling thread. Returned pointer must not be freed.

struct NVCVExtraChannelInfo: #include <DataLayout.h>

Data structure for passing additional channel information.

struct NVCVPackingParams: #include <DataLayout.h>

Defines the parameters encoded in a NVCVPacking.