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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