Pack array of float/double using AEC/CCSDS compression. More...

#include <stdint.h>
#include <stdlib.h>
#include <math.h>
#include <libaec.h>
#include "grib2_int.h"

Functions
void	aecpack (float fld, g2int width, g2int height, g2int idrstmpl, unsigned char cpack, g2int lcpack)
	This function packs up a float array into a AEC code stream. More...

static int	aecpack_int (void fld, int fld_is_double, g2int width, g2int height, g2int idrstmpl, unsigned char cpack, g2int lcpack, int verbose)
	This internal function packs up a float or double array into a AEC/CCSDS code stream. More...

int	g2c_aecpackd (double fld, size_t width, size_t height, int idrstmpl, unsigned char cpack, size_t lcpack)
	This function packs up a double array into a AEC code stream. More...

int	g2c_aecpackf (float fld, size_t width, size_t height, int idrstmpl, unsigned char cpack, size_t lcpack)
	This function packs up a float array into a AEC code stream. More...

Detailed Description

Pack array of float/double using AEC/CCSDS compression.

Author: Eric Engle

Date: 2023-09-10

Program History Log

Date	Programmer	Comments
2023-09-10	Engle	Initial; Adapted from aecpack.c.
2023-10-16	Engle	Added include libaec to set default values

for CCSDS parameters.

Definition in file aecpack.c.

Function Documentation

◆ aecpack()

void aecpack	(	float *	fld,
		g2int	width,
		g2int	height,
		g2int *	idrstmpl,
		unsigned char *	cpack,
		g2int *	lcpack
	)

This function packs up a float array into a AEC code stream.

After the data are scaled, and the reference value is subtracted out, the data are passed to the AEC encoder.

This function also fills in GRIB2 Data Representation Template 5.42 with the appropriate values.

Parameters

fld	Pointer to the float data values to pack.
width	The number of points in the x direction.
height	The number of points in the y direction.
idrstmpl	Contains the array of values for Data Representation Template Table 5.42. 0 Reference value - ignored on input, set by aecpack routine. 1 Binary Scale Factor - used on input, unchanged by aecpack routine. 2 Decimal Scale Factor - used on input, unchanged by aecpack routine. 3 number of bits for each data value - ignored on input 4 Original field type - currently ignored on input Data values assumed to be reals. Set to 0 on output. 5 CCSDS compression options mask. 6 Block size. 7 Reference sample interval. May be modified in this function.
cpack	A pointer that will get the packed data field. Must be allocated before this function is called. Pass the allocated size in the lcpack parameter.
lcpack	Pointer that gets the length of packed field in cpack. This must be set by the calling function to the size available in cpack.

Author: Eric Engle (adapted from jpcpack)

Definition at line 297 of file aecpack.c.

References aecpack_int().

Referenced by g2_addfield().

◆ aecpack_int()

static int aecpack_int	(	void *	fld,
		int	fld_is_double,
		g2int	width,
		g2int	height,
		g2int *	idrstmpl,
		unsigned char *	cpack,
		g2int *	lcpack,
		int	verbose
	)

static

This internal function packs up a float or double array into a AEC/CCSDS code stream.

Parameters

fld	Pointer to the float or double data values to pack.
fld_is_double	If non-zero, then fld points to array of doubles, otherwise an array of floats.
width	The number of points in the x direction.
height	The number of points in the y direction.
idrstmpl	Contains the array of values for Data Representation Template Table 5.42. May be modified in this function.
cpack	A pointer that will get the packed data field. Must be allocated before this function is called. Pass the allocated size in the lcpack parameter.
lcpack	Pointer that gets the length of packed field in cpack. This must also be set by the calling function to the size available in cpack.
verbose	If non-zero, error messages will be printed in case of error. Otherwise, error codes will be return but no error messages printed. Calls to the original g2c API may cause error messages to be printed in case of error. For the new g2c_ API, no error messages will be printed - instead an error code will be returned. Call g2c_strerror() to get the error message for any error code.

Returns

G2C_NOERROR No error.
G2C_EAEC Error encoding/decoding AEC data.

Author: Eric Engle

Definition at line 53 of file aecpack.c.

References ALOG2, enc_aec(), G2C_NOERROR, int_power(), LOG, mkieee(), and sbits().

Referenced by aecpack(), g2c_aecpackd(), and g2c_aecpackf().

◆ g2c_aecpackd()

int g2c_aecpackd	(	double *	fld,
		size_t	width,
		size_t	height,
		int *	idrstmpl,
		unsigned char *	cpack,
		size_t *	lcpack
	)

This function packs up a double array into a AEC code stream.

After the data are scaled, and the reference value is subtracted out, the data are passed to the AEC encoder.

This function also fills in GRIB2 Data Representation Template 5.42 with the appropriate values.

This function is the V2 API version of aecpack() for floats.

Parameters

fld	Pointer to the float data values to pack.
width	The number of points in the x direction.
height	The number of points in the y direction.
idrstmpl	Contains the array of values for Data Representation Template Table 5.42. 0 Reference value - ignored on input, set by aecpack routine. 1 Binary Scale Factor - used on input, unchanged by aecpack routine. 2 Decimal Scale Factor - used on input, unchanged by aecpack routine. 3 number of bits for each data value - ignored on input 4 Original field type - currently ignored on input Data values assumed to be reals. Set to 0 on output. 5 CCSDS compression options mask. 6 Block size. 7 Reference sample interval. May be modified in this function.
cpack	A pointer that will get the packed data field. Must be allocated before this function is called. Pass the allocated size in the lcpack parameter.
lcpack	Pointer that gets the length of packed field in cpack. This must be set by the calling function to the size available in cpack.

Returns

G2C_NOERROR No error.
G2C_EAEC Error encoding/decoding AEC data.

Author: Eric Engle (adapted from jpcpack)

Definition at line 410 of file aecpack.c.

References aecpack_int(), and G2C_AEC_DRS_TEMPLATE_LEN.

◆ g2c_aecpackf()

int g2c_aecpackf	(	float *	fld,
		size_t	width,
		size_t	height,
		int *	idrstmpl,
		unsigned char *	cpack,
		size_t *	lcpack
	)

This function packs up a float array into a AEC code stream.

After the data are scaled, and the reference value is subtracted out, the data are passed to the AEC encoder.

This function also fills in GRIB2 Data Representation Template 5.42 with the appropriate values.

This function is the V2 API version of aecpack() for floats.

Parameters

fld	Pointer to the float data values to pack.
width	The number of points in the x direction.
height	The number of points in the y direction.
idrstmpl	Contains the array of values for Data Representation Template Table 5.42. 0 Reference value - ignored on input, set by aecpack routine. 1 Binary Scale Factor - used on input, unchanged by aecpack routine. 2 Decimal Scale Factor - used on input, unchanged by aecpack routine. 3 number of bits for each data value - ignored on input 4 Original field type - currently ignored on input Data values assumed to be reals. Set to 0 on output. 5 CCSDS compression options mask. 6 Block size. 7 Reference sample interval. May be modified in this function.
cpack	A pointer that will get the packed data field. Must be allocated before this function is called. Pass the allocated size in the lcpack parameter.
lcpack	Pointer that gets the length of packed field in cpack. This must be set by the calling function to the size available in cpack.

Returns

G2C_NOERROR No error.
G2C_EAEC Error encoding/decoding AEC data.

Author: Eric Engle (adapted from jpcpack)

Definition at line 346 of file aecpack.c.

References aecpack_int(), and G2C_AEC_DRS_TEMPLATE_LEN.

Functions

Detailed Description

Program History Log

Function Documentation

◆ aecpack()

◆ aecpack_int()

◆ g2c_aecpackd()

◆ g2c_aecpackf()