jp2_cod.h

用C语言实现的JPEG编码

/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2002 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer Software License
 * 
 * IMAGE POWER JPEG-2000 PUBLIC LICENSE
 * ************************************
 * 
 * GRANT:
 * 
 * Permission is hereby granted, free of charge, to any person (the "User")
 * obtaining a copy of this software and associated documentation, to deal
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 * and/or sell copies of the JasPer Software (in source and binary forms),
 * and to permit persons to whom the JasPer Software is furnished to do so,
 * provided further that the License Conditions below are met.
 * 
 * License Conditions
 * ******************
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 * __END_OF_JASPER_LICENSE__
 */

/*
 * JP2 Library
 *
 * $Id$
 */

#ifndef JP2_COD_H
#define JP2_COD_H

/******************************************************************************\
* Includes.
\******************************************************************************/

#include "jasper/jas_types.h"

/******************************************************************************\
* Macros.
\******************************************************************************/

#define	JP2_SPTOBPC(s, p) \
	((((p) - 1) & 0x7f) | (((s) & 1) << 7))

/******************************************************************************\
* Box class.
\******************************************************************************/

#define	JP2_BOX_HDRLEN	8

/* Box types. */
#define	JP2_BOX_JP		0x6a502020	/* Signature */
#define JP2_BOX_FTYP	0x66747970	/* File Type */
#define	JP2_BOX_JP2H	0x6a703268	/* JP2 Header */
#define	JP2_BOX_IHDR	0x69686472	/* Image Header */
#define	JP2_BOX_BPCC	0x62706363	/* Bits Per Component */
#define	JP2_BOX_COLR	0x636f6c72	/* Color Specification */
#define	JP2_BOX_PCLR	0x70636c72	/* Palette */
#define	JP2_BOX_CMAP	0x636d6170	/* Component Mapping */
#define	JP2_BOX_CDEF	0x63646566	/* Channel Definition */
#define	JP2_BOX_RES		0x72657320	/* Resolution */
#define	JP2_BOX_RESC	0x72657363	/* Capture Resolution */
#define	JP2_BOX_RESD	0x72657364	/* Default Display Resolution */
#define	JP2_BOX_JP2C	0x6a703263	/* Contiguous Code Stream */
#define	JP2_BOX_JP2I	0x6a703269	/* Intellectual Property */
#define	JP2_BOX_XML		0x786d6c20	/* XML */
#define	JP2_BOX_UUID	0x75756964	/* UUID */
#define	JP2_BOX_UINF	0x75696e66	/* UUID Info */
#define	JP2_BOX_ULST	0x75637374	/* UUID List */
#define	JP2_BOX_URL		0x75726c20	/* URL */

#define	JP2_BOX_SUPER	0x01
#define	JP2_BOX_NODATA	0x02

/* JP box data. */

#define	JP2_JP_MAGIC	0x0d0a870a
#define	JP2_JP_LEN		12

typedef struct {
	uint_fast32_t magic;
} jp2_jp_t;

/* FTYP box data. */

#define	JP2_FTYP_MAXCOMPATCODES	32
#define	JP2_FTYP_MAJVER		0x6a703220
#define	JP2_FTYP_MINVER		0
#define	JP2_FTYP_COMPATCODE		JP2_FTYP_MAJVER

typedef struct {
	uint_fast32_t majver;
	uint_fast32_t minver;
	uint_fast32_t numcompatcodes;
	uint_fast32_t compatcodes[JP2_FTYP_MAXCOMPATCODES];
} jp2_ftyp_t;

/* IHDR box data. */

#define	JP2_IHDR_COMPTYPE	7
#define	JP2_IHDR_BPCNULL	255

typedef struct {
	uint_fast32_t width;
	uint_fast32_t height;
	uint_fast16_t numcmpts;
	uint_fast8_t bpc;
	uint_fast8_t comptype;
	uint_fast8_t csunk;
	uint_fast8_t ipr;
} jp2_ihdr_t;

/* BPCC box data. */

typedef struct {
	uint_fast16_t numcmpts;
	uint_fast8_t *bpcs;
} jp2_bpcc_t;

/* COLR box data. */

#define	JP2_COLR_ENUM	1
#define	JP2_COLR_ICC	2
#define	JP2_COLR_PRI	0

#define	JP2_COLR_SRGB	16
#define	JP2_COLR_SGRAY	17
#define	JP2_COLR_SYCC	18

typedef struct {
	uint_fast8_t method;
	uint_fast8_t pri;
	uint_fast8_t approx;
	uint_fast32_t csid;
	uint_fast8_t *iccp;
	int iccplen;
	/* XXX - Someday we ought to add ICC profile data here. */
} jp2_colr_t;

/* PCLR box data. */

typedef struct {
	uint_fast16_t numlutents;
	uint_fast8_t numchans;
	int_fast32_t *lutdata;
	uint_fast8_t *bpc;
} jp2_pclr_t;

/* CDEF box per-channel data. */

#define JP2_CDEF_RGB_R	1
#define JP2_CDEF_RGB_G	2
#define JP2_CDEF_RGB_B	3

#define JP2_CDEF_YCBCR_Y	1
#define JP2_CDEF_YCBCR_CB	2
#define JP2_CDEF_YCBCR_CR	3

#define	JP2_CDEF_GRAY_Y	1

#define	JP2_CDEF_TYPE_COLOR	0
#define	JP2_CDEF_TYPE_OPACITY	1
#define	JP2_CDEF_TYPE_UNSPEC	65535
#define	JP2_CDEF_ASOC_ALL	0
#define	JP2_CDEF_ASOC_NONE	65535

typedef struct {
	uint_fast16_t channo;
	uint_fast16_t type;
	uint_fast16_t assoc;
} jp2_cdefchan_t;

/* CDEF box data. */

typedef struct {
	uint_fast16_t numchans;
	jp2_cdefchan_t *ents;
} jp2_cdef_t;

typedef struct {
	uint_fast16_t cmptno;
	uint_fast8_t map;
	uint_fast8_t pcol;
} jp2_cmapent_t;

typedef struct {
	uint_fast16_t numchans;
	jp2_cmapent_t *ents;
} jp2_cmap_t;

typedef struct {
	uint_fast32_t data_len;
	uint_fast8_t uuid[16];
	uint_fast8_t *data;
} jp2_uuid_t;

#define	JP2_CMAP_DIRECT		0
#define	JP2_CMAP_PALETTE	1

/* Generic box. */

struct jp2_boxops_s;
typedef struct {

	struct jp2_boxops_s *ops;
	struct jp2_boxinfo_s *info;

	uint_fast32_t type;
	uint_fast32_t len;
	uint_fast32_t data_len;

	union {
		jp2_jp_t jp;
		jp2_ftyp_t ftyp;
		jp2_ihdr_t ihdr;
		jp2_bpcc_t bpcc;
		jp2_colr_t colr;
		jp2_pclr_t pclr;
		jp2_cdef_t cdef;
		jp2_cmap_t cmap;
		jp2_uuid_t uuid;
	} data;

} jp2_box_t;

typedef struct jp2_boxops_s {
	void (*init)(jp2_box_t *box);
	void (*destroy)(jp2_box_t *box);
	int (*getdata)(jp2_box_t *box, jas_stream_t *in);
	int (*putdata)(jp2_box_t *box, jas_stream_t *out);
	void (*dumpdata)(jp2_box_t *box, FILE *out);
} jp2_boxops_t;

/******************************************************************************\
*
\******************************************************************************/

typedef struct jp2_boxinfo_s {
	int type;
	char *name;
	int flags;
	jp2_boxops_t ops;
} jp2_boxinfo_t;

/******************************************************************************\
* Box class.
\******************************************************************************/

jp2_box_t *jp2_box_create(int type);
void jp2_box_destroy(jp2_box_t *box);
jp2_box_t *jp2_box_get(jas_stream_t *in);
int jp2_box_put(jp2_box_t *box, jas_stream_t *out);

#define JP2_DTYPETOBPC(dtype) \
  ((JAS_IMAGE_CDT_GETSGND(dtype) << 7) | (JAS_IMAGE_CDT_GETPREC(dtype) - 1))
#define	JP2_BPCTODTYPE(bpc) \
  (JAS_IMAGE_CDT_SETSGND(bpc >> 7) | JAS_IMAGE_CDT_SETPREC((bpc & 0x7f) + 1))

#define ICC_CS_RGB	0x52474220
#define ICC_CS_YCBCR	0x59436272
#define ICC_CS_GRAY	0x47524159

jp2_cdefchan_t *jp2_cdef_lookup(jp2_cdef_t *cdef, int channo);


#endif