jpcunpack.c File Reference

Unpack a data field that was packed into a JPEG2000 code stream. More...

#include <stdio.h>
#include <stdlib.h>
#include "grib2.h"

Go to the source code of this file.

Functions
int	dec_jpeg2000 (char *, g2int, g2int *)
	This Function decodes a JPEG2000 code stream specified in the JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1) using JasPer Software written by the University of British Columbia and Image Power Inc, and others. More...
g2int	jpcunpack (unsigned char *cpack, g2int len, g2int *idrstmpl, g2int ndpts, g2float *fld)
	This subroutine unpacks a data field that was packed into a JPEG2000 code stream using info from the GRIB2 Data Representation Template 5.40 or 5.40000. More...

Detailed Description

Unpack a data field that was packed into a JPEG2000 code stream.

Author

Stephem Gilbert

Date

2003-08-27

Definition in file jpcunpack.c.

Function Documentation

dec_jpeg2000()

int dec_jpeg2000	(	char *	injpc,
		g2int	bufsize,
		g2int *	outfld
	)

This Function decodes a JPEG2000 code stream specified in the JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1) using JasPer Software written by the University of British Columbia and Image Power Inc, and others.

JasPer is available at http://www.ece.uvic.ca/~mdadams/jasper/.

Parameters

injpc	Input JPEG2000 code stream.
bufsize	Length (in bytes) of the input JPEG2000 code stream.
outfld	Output matrix of grayscale image values.

Returns

• 0 Successful decode
• -3 Error decode jpeg2000 code stream.
• -5 decoded image had multiple color components. Only grayscale is expected.

Author

Stephen Gilbert

Date

2002-12-02

Definition at line 42 of file dec_jpeg2000.c.

Referenced by jpcunpack().

jpcunpack()

g2int jpcunpack	(	unsigned char *	cpack,
		g2int	len,
		g2int *	idrstmpl,
		g2int	ndpts,
		g2float *	fld
	)

This subroutine unpacks a data field that was packed into a JPEG2000 code stream using info from the GRIB2 Data Representation Template 5.40 or 5.40000.

Parameters

cpack	The packed data field (character*1 array).
len	length of packed field cpack.
idrstmpl	Pointer to array of values for Data Representation Template 5.40 or 5.40000.
ndpts	The number of data values to unpack.
fld	Contains the unpacked data values.

Returns

0 for success, 1 for memory allocation error.

Author

Stephem Gilbert

Date

2003-08-27

Definition at line 31 of file jpcunpack.c.

References dec_jpeg2000(), int_power(), and rdieee().

Referenced by g2_unpack7().