jpc_cs.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
 * ************************************
 * 
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 * 
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 * License Conditions
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 */

/*
 * JPEG-2000 Code Stream Library
 *
 * $Id$
 */

#ifndef JPC_CS_H
#define JPC_CS_H

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

#include "jasper/jas_image.h"
#include "jasper/jas_stream.h"

#include "jpc_cod.h"

/******************************************************************************\
* Constants and Types.
\******************************************************************************/

/* The maximum number of resolution levels. */
#define	JPC_MAXRLVLS	33

/* The maximum number of bands. */
#define	JPC_MAXBANDS	(3 * JPC_MAXRLVLS + 1)

/* The maximum number of layers. */
#define JPC_MAXLYRS	16384

/**************************************\
* Code stream.
\**************************************/

/*
 * Code stream states.
 */

/* Initial. */
#define	JPC_CS_INIT	0
/* Main header. */
#define	JPC_CS_MHDR	1
/* Tile-part header. */
#define	JPC_CS_THDR	2
/* Main trailer. */
#define	JPC_CS_MTLR	3
/* Tile-part data. */
#define	JPC_CS_TDATA	4

/*
 * Unfortunately, the code stream syntax was not designed in such a way that
 * any given marker segment can be correctly decoded without additional state
 * derived from previously decoded marker segments.
 * For example, a RGN/COC/QCC marker segment cannot be decoded unless the
 * number of components is known.
 */

/*
 * Code stream state information.
 */

typedef struct {

	/* The number of components. */
	uint_fast16_t numcomps;

} jpc_cstate_t;

/**************************************\
* SOT marker segment parameters.
\**************************************/

typedef struct {

	/* The tile number. */
	uint_fast16_t tileno;

	/* The combined length of the marker segment and its auxilary data
	  (i.e., packet data). */
	uint_fast32_t len;

	/* The tile-part instance. */
	uint_fast8_t partno;

	/* The number of tile-parts. */
	uint_fast8_t numparts;

} jpc_sot_t;

/**************************************\
* SIZ marker segment parameters.
\**************************************/

/* Per component information. */

typedef struct {

	/* The precision of the samples. */
	uint_fast8_t prec;

	/* The signedness of the samples. */
	uint_fast8_t sgnd;

	/* The horizontal separation of samples with respect to the reference
	  grid. */
	uint_fast8_t hsamp;

	/* The vertical separation of samples with respect to the reference
	  grid. */
	uint_fast8_t vsamp;

} jpc_sizcomp_t;

/* SIZ marker segment parameters. */

typedef struct {

	/* The code stream capabilities. */
	uint_fast16_t caps;

	/* The width of the image in units of the reference grid. */
	uint_fast32_t width;

	/* The height of the image in units of the reference grid. */
	uint_fast32_t height;

	/* The horizontal offset from the origin of the reference grid to the
	  left side of the image area. */
	uint_fast32_t xoff;

	/* The vertical offset from the origin of the reference grid to the
	  top side of the image area. */
	uint_fast32_t yoff;

	/* The nominal width of a tile in units of the reference grid. */
	uint_fast32_t tilewidth;

	/* The nominal height of a tile in units of the reference grid. */
	uint_fast32_t tileheight;

	/* The horizontal offset from the origin of the reference grid to the
	  left side of the first tile. */
	uint_fast32_t tilexoff;

	/* The vertical offset from the origin of the reference grid to the
	  top side of the first tile. */
	uint_fast32_t tileyoff;

	/* The number of components. */
	uint_fast16_t numcomps;

	/* The per-component information. */
	jpc_sizcomp_t *comps;

} jpc_siz_t;

/**************************************\
* COD marker segment parameters.
\**************************************/

/*
 * Coding style constants.
 */

/* Precincts may be used. */
#define	JPC_COX_PRT	0x01
/* SOP marker segments may be used. */
#define	JPC_COD_SOP	0x02
/* EPH marker segments may be used. */
#define	JPC_COD_EPH	0x04

/*
 * Progression order constants.
 */

/* Layer-resolution-component-precinct progressive
  (i.e., progressive by fidelity). */
#define	JPC_COD_LRCPPRG	0
/* Resolution-layer-component-precinct progressive
  (i.e., progressive by resolution). */
#define	JPC_COD_RLCPPRG	1
/* Resolution-precinct-component-layer progressive. */
#define	JPC_COD_RPCLPRG	2
/* Precinct-component-resolution-layer progressive. */
#define	JPC_COD_PCRLPRG	3
/* Component-position-resolution-layer progressive. */
#define	JPC_COD_CPRLPRG	4

/*
 * Code block style constants.
 */

#define	JPC_COX_LAZY	0x01 /* Selective arithmetic coding bypass. */
#define	JPC_COX_RESET	0x02 /* Reset context probabilities. */
#define	JPC_COX_TERMALL	0x04 /* Terminate all coding passes. */
#define	JPC_COX_VSC		0x08 /* Vertical stripe causal context formation. */
#define	JPC_COX_PTERM	0x10 /* Predictable termination. */
#define	JPC_COX_SEGSYM	0x20 /* Use segmentation symbols. */

/* Transform constants. */
#define	JPC_COX_INS	0x00 /* Irreversible 9/7. */
#define	JPC_COX_RFT	0x01 /* Reversible 5/3. */

/* Multicomponent transform constants. */
#define	JPC_COD_NOMCT	0x00 /* No multicomponent transform. */
#define	JPC_COD_MCT		0x01 /* Multicomponent transform. */

/* Get the code block size value from the code block size exponent. */
#define	JPC_COX_CBLKSIZEEXPN(x)		((x) - 2)
/* Get the code block size exponent from the code block size value. */
#define	JPC_COX_GETCBLKSIZEEXPN(x)	((x) + 2)

/* Per resolution-level information. */

typedef struct {

	/* The packet partition width. */
	uint_fast8_t parwidthval;

	/* The packet partition height. */
	uint_fast8_t parheightval;

} jpc_coxrlvl_t;

/* Per component information. */

typedef struct {

	/* The coding style. */
	uint_fast8_t csty;

	/* The number of decomposition levels. */
	uint_fast8_t numdlvls;

	/* The nominal code block width specifier. */
	uint_fast8_t cblkwidthval;

	/* The nominal code block height specifier. */
	uint_fast8_t cblkheightval;

	/* The style of coding passes. */
	uint_fast8_t cblksty;

	/* The QMFB employed. */
	uint_fast8_t qmfbid;

	/* The number of resolution levels. */
	int numrlvls;

	/* The per-resolution-level information. */
	jpc_coxrlvl_t rlvls[JPC_MAXRLVLS];

} jpc_coxcp_t;

/* COD marker segment parameters. */

typedef struct {

	/* The general coding style. */
	uint_fast8_t csty;

	/* The progression order. */
	uint_fast8_t prg;

	/* The number of layers. */
	uint_fast16_t numlyrs;

	/* The multicomponent transform. */
	uint_fast8_t mctrans;

	/* Component-related parameters. */
	jpc_coxcp_t compparms;

} jpc_cod_t;

/* COC marker segment parameters. */

typedef struct {

	/* The component number. */
	uint_fast16_t compno;

	/* Component-related parameters. */
	jpc_coxcp_t compparms;

} jpc_coc_t;

/**************************************\
* RGN marker segment parameters.
\**************************************/

/* The maxshift ROI style. */
#define	JPC_RGN_MAXSHIFT	0x00