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jpcunpack.c(3) NCEPLIBS-g2c jpcunpack.c(3)

NAME

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

SYNOPSIS

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

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 version 1.500.4 (or 1.700.2) written by the University of British Columbia and Image Power Inc, and others. 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.

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

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 version 1.500.4 (or 1.700.2) 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.

Note

Requires JasPer Software version 1.500.4 or 1.700.2.

Author

Stephen Gilbert

Date

2002-12-02

Definition at line 43 of file dec_jpeg2000.c.

Referenced by 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 29 of file jpcunpack.c.

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

Referenced by g2_unpack7().

Author

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Tue May 3 2022 Version 1.6.4