j2k.h

关于JPEG2000压缩标准的模板程序的内容,是我们导师给的,据说是国外的版本.

/*
 * Copyright (c) 2001-2002, David Janssens
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#define VERSION "0.0.8"

#ifdef WIN32
#ifdef LIBJ2K_EXPORTS
#define LIBJ2K_API __declspec(dllexport)
#else
#define LIBJ2K_API __declspec(dllimport)
#endif
#else
#define LIBJ2K_API
#endif

#ifndef __J2K_H
#define __J2K_H

#define J2K_MAXRLVLS 33
#define J2K_MAXBANDS (3*J2K_MAXRLVLS+1)

#define J2K_CP_CSTY_PRT 0x01
#define J2K_CP_CSTY_SOP 0x02
#define J2K_CP_CSTY_EPH 0x04
#define J2K_CCP_CSTY_PRT 0x01
#define J2K_CCP_CBLKSTY_LAZY 0x01
#define J2K_CCP_CBLKSTY_RESET 0x02
#define J2K_CCP_CBLKSTY_TERMALL 0x04
#define J2K_CCP_CBLKSTY_VSC 0x08
#define J2K_CCP_CBLKSTY_PTERM 0x10
#define J2K_CCP_CBLKSTY_SEGSYM 0x20
#define J2K_CCP_QNTSTY_NOQNT 0
#define J2K_CCP_QNTSTY_SIQNT 1
#define J2K_CCP_QNTSTY_SEQNT 2

typedef struct {
    int dx, dy; // XRsiz, YRsiz
    int prec; // precision
    int sgnd; // signed
    int *data; // image-component data
} j2k_comp_t;

typedef struct {
    int x0, y0; // XOsiz, YOsiz
    int x1, y1; // Xsiz, Ysiz 
    int numcomps; // number of components
    j2k_comp_t *comps; // image-components
} j2k_image_t;

typedef struct {
    int expn; // exponent
    int mant; // mantissa
} j2k_stepsize_t;

typedef struct {
    int csty; // coding style
    int numresolutions; // number of resolutions
    int cblkw; // width of code-blocks
    int cblkh; // height of code-blocks
    int cblksty; // code-block coding style
    int qmfbid; // discrete wavelet transform identifier
    int qntsty; // quantisation style
    j2k_stepsize_t stepsizes[J2K_MAXBANDS]; // stepsizes used for quantisation
    int numgbits; // number of guard bits
    int roishift; // Region Of Interest shift
    int prcw[J2K_MAXRLVLS]; // Precinct width
    int prch[J2K_MAXRLVLS]; // Precinct height
} j2k_tccp_t;

typedef struct {
    int resno0, compno0; 
    int layno1, resno1, compno1;
    int prg;
} j2k_poc_t;

typedef struct {
    int csty; // coding style  
    int prg; // progression order
    int numlayers; // number of layers
    int mct; // multi-component transform identifier
    int rates[32]; // rates of layers
    int numpocs; // number of progression order changes 
    j2k_poc_t pocs[32]; // progression order changes
    j2k_tccp_t *tccps; // tile-component coding parameters
} j2k_tcp_t;

typedef struct {
    int tx0, ty0; // XTOsiz, YTOsiz
    int tdx, tdy; // XTsiz, YTsiz
    int tw, th;
    j2k_tcp_t *tcps; // tile coding parameters
} j2k_cp_t;

/* 
 * Encode an image into a JPEG-2000 codestream
 * i: image to encode
 * cp: coding parameters
 * dest: destination buffer
 * len: length of destination buffer
 */
LIBJ2K_API int j2k_encode(j2k_image_t *i, j2k_cp_t *cp, unsigned char *dest, int len);
/*
 * Decode an image from a JPEG-2000 codestream
 * src: source buffer
 * len: length of source buffer
 * i: decode image
 * cp: coding parameters that were used to encode the image
 */
LIBJ2K_API int j2k_decode(unsigned char *src, int len, j2k_image_t **i, j2k_cp_t **cp);

#endif