jpc_t1cod.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.
 */

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/*
 * $Id$
 */

#ifndef JPC_T1COD_H
#define JPC_T1COD_H

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

#include "jasper/jas_fix.h"
#include "jasper/jas_math.h"

#include "jpc_mqcod.h"
#include "jpc_tsfb.h"

/******************************************************************************\
* Constants.
\******************************************************************************/

/* The number of bits used to index into various lookup tables. */
#define JPC_NMSEDEC_BITS	7
#define JPC_NMSEDEC_FRACBITS	(JPC_NMSEDEC_BITS - 1)

/*
 * Segment types.
 */

/* Invalid. */
#define JPC_SEG_INVALID	0
/* MQ. */
#define JPC_SEG_MQ		1
/* Raw. */
#define JPC_SEG_RAW		2

/* The nominal word size. */
#define	JPC_PREC	32

/* Tier-1 coding pass types. */
#define	JPC_SIGPASS	0	/* significance */
#define	JPC_REFPASS	1	/* refinement */
#define	JPC_CLNPASS	2	/* cleanup */

/*
 * Per-sample state information for tier-1 coding.
 */

/* The northeast neighbour has been found to be significant. */
#define	JPC_NESIG	0x0001
/* The southeast neighbour has been found to be significant. */
#define	JPC_SESIG	0x0002
/* The southwest neighbour has been found to be significant. */
#define	JPC_SWSIG	0x0004
/* The northwest neighbour has been found to be significant. */
#define	JPC_NWSIG	0x0008
/* The north neighbour has been found to be significant. */
#define	JPC_NSIG	0x0010
/* The east neighbour has been found to be significant. */
#define	JPC_ESIG	0x0020
/* The south neighbour has been found to be significant. */
#define	JPC_SSIG	0x0040
/* The west neighbour has been found to be significant. */
#define	JPC_WSIG	0x0080
/* The significance mask for 8-connected neighbours. */
#define	JPC_OTHSIGMSK \
	(JPC_NSIG | JPC_NESIG | JPC_ESIG | JPC_SESIG | JPC_SSIG | JPC_SWSIG | JPC_WSIG | JPC_NWSIG)
/* The significance mask for 4-connected neighbours. */
#define	JPC_PRIMSIGMSK	(JPC_NSIG | JPC_ESIG | JPC_SSIG | JPC_WSIG)

/* The north neighbour is negative in value. */
#define	JPC_NSGN	0x0100
/* The east neighbour is negative in value. */
#define	JPC_ESGN	0x0200
/* The south neighbour is negative in value. */
#define	JPC_SSGN	0x0400
/* The west neighbour is negative in value. */
#define	JPC_WSGN	0x0800
/* The sign mask for 4-connected neighbours. */
#define	JPC_SGNMSK	(JPC_NSGN | JPC_ESGN | JPC_SSGN | JPC_WSGN)

/* This sample has been found to be significant. */
#define JPC_SIG		0x1000
/* The sample has been refined. */
#define	JPC_REFINE	0x2000
/* This sample has been processed during the significance pass. */
#define	JPC_VISIT	0x4000

/* The number of aggregation contexts. */
#define	JPC_NUMAGGCTXS	1
/* The number of zero coding contexts. */
#define	JPC_NUMZCCTXS	9
/* The number of magnitude contexts. */
#define	JPC_NUMMAGCTXS	3
/* The number of sign coding contexts. */
#define	JPC_NUMSCCTXS	5
/* The number of uniform contexts. */
#define	JPC_NUMUCTXS	1

/* The context ID for the first aggregation context. */
#define	JPC_AGGCTXNO	0
/* The context ID for the first zero coding context. */
#define	JPC_ZCCTXNO		(JPC_AGGCTXNO + JPC_NUMAGGCTXS)
/* The context ID for the first magnitude context. */
#define	JPC_MAGCTXNO	(JPC_ZCCTXNO + JPC_NUMZCCTXS)
/* The context ID for the first sign coding context. */
#define	JPC_SCCTXNO		(JPC_MAGCTXNO + JPC_NUMMAGCTXS)
/* The context ID for the first uniform context. */
#define	JPC_UCTXNO		(JPC_SCCTXNO + JPC_NUMSCCTXS)
/* The total number of contexts. */
#define	JPC_NUMCTXS		(JPC_UCTXNO + JPC_NUMUCTXS)

/******************************************************************************\
* External data.
\******************************************************************************/

/* These lookup tables are used by various macros/functions. */
/* Do not access these lookup tables directly. */
extern int jpc_zcctxnolut[];
extern int jpc_spblut[];
extern int jpc_scctxnolut[];
extern int jpc_magctxnolut[];
extern jpc_fix_t jpc_refnmsedec[];
extern jpc_fix_t jpc_signmsedec[];
extern jpc_fix_t jpc_refnmsedec0[];
extern jpc_fix_t jpc_signmsedec0[];

/* The initial settings for the MQ contexts. */
extern jpc_mqctx_t jpc_mqctxs[];

/******************************************************************************\
* Functions and macros.
\******************************************************************************/

/* Initialize the MQ contexts. */
void jpc_initctxs(jpc_mqctx_t *ctxs);

/* Get the zero coding context. */
int jpc_getzcctxno(int f, int orient);
#define	JPC_GETZCCTXNO(f, orient) \
	(jpc_zcctxnolut[((orient) << 8) | ((f) & JPC_OTHSIGMSK)])

/* Get the sign prediction bit. */
int jpc_getspb(int f);
#define	JPC_GETSPB(f) \
	(jpc_spblut[((f) & (JPC_PRIMSIGMSK | JPC_SGNMSK)) >> 4])

/* Get the sign coding context. */
int jpc_getscctxno(int f);
#define	JPC_GETSCCTXNO(f) \
	(jpc_scctxnolut[((f) & (JPC_PRIMSIGMSK | JPC_SGNMSK)) >> 4])

/* Get the magnitude context. */
int jpc_getmagctxno(int f);
#define	JPC_GETMAGCTXNO(f) \
	(jpc_magctxnolut[((f) & JPC_OTHSIGMSK) | ((((f) & JPC_REFINE) != 0) << 11)])

/* Get the normalized MSE reduction for significance passes. */
#define	JPC_GETSIGNMSEDEC(x, bitpos)	jpc_getsignmsedec_macro(x, bitpos)
jpc_fix_t jpc_getsignmsedec_func(jpc_fix_t x, int bitpos);
#define	jpc_getsignmsedec_macro(x, bitpos) \
	((bitpos > JPC_NMSEDEC_FRACBITS) ? jpc_signmsedec[JPC_ASR(x, bitpos - JPC_NMSEDEC_FRACBITS) & JAS_ONES(JPC_NMSEDEC_BITS)] : \
	  (jpc_signmsedec0[JPC_ASR(x, bitpos - JPC_NMSEDEC_FRACBITS) & JAS_ONES(JPC_NMSEDEC_BITS)]))

/* Get the normalized MSE reduction for refinement passes. */
#define	JPC_GETREFNMSEDEC(x, bitpos)	jpc_getrefnmsedec_macro(x, bitpos)
jpc_fix_t jpc_refsignmsedec_func(jpc_fix_t x, int bitpos);
#define	jpc_getrefnmsedec_macro(x, bitpos) \
	((bitpos > JPC_NMSEDEC_FRACBITS) ? jpc_refnmsedec[JPC_ASR(x, bitpos - JPC_NMSEDEC_FRACBITS) & JAS_ONES(JPC_NMSEDEC_BITS)] : \
	  (jpc_refnmsedec0[JPC_ASR(x, bitpos - JPC_NMSEDEC_FRACBITS) & JAS_ONES(JPC_NMSEDEC_BITS)]))

/* Arithmetic shift right (with ability to shift left also). */
#define	JPC_ASR(x, n) \
	(((n) >= 0) ? ((x) >> (n)) : ((x) << (-(n))))

/* Update the per-sample state information. */
#define	JPC_UPDATEFLAGS4(fp, rowstep, s, vcausalflag) \
{ \
	register jpc_fix_t *np = (fp) - (rowstep); \
	register jpc_fix_t *sp = (fp) + (rowstep); \
	if ((vcausalflag)) { \
		sp[-1] |= JPC_NESIG; \
		sp[1] |= JPC_NWSIG; \
		if (s) { \
			*sp |= JPC_NSIG | JPC_NSGN; \
			(fp)[-1] |= JPC_ESIG | JPC_ESGN; \
			(fp)[1] |= JPC_WSIG | JPC_WSGN; \
		} else { \
			*sp |= JPC_NSIG; \
			(fp)[-1] |= JPC_ESIG; \
			(fp)[1] |= JPC_WSIG; \
		} \
	} else { \
		np[-1] |= JPC_SESIG; \
		np[1] |= JPC_SWSIG; \
		sp[-1] |= JPC_NESIG; \
		sp[1] |= JPC_NWSIG; \
		if (s) { \
			*np |= JPC_SSIG | JPC_SSGN; \
			*sp |= JPC_NSIG | JPC_NSGN; \
			(fp)[-1] |= JPC_ESIG | JPC_ESGN; \
			(fp)[1] |= JPC_WSIG | JPC_WSGN; \
		} else { \
			*np |= JPC_SSIG; \
			*sp |= JPC_NSIG; \
			(fp)[-1] |= JPC_ESIG; \
			(fp)[1] |= JPC_WSIG; \
		} \
	} \
}

/* Initialize the lookup tables used by the codec. */
void jpc_initluts(void);

/* Get the nominal gain associated with a particular band. */
int JPC_NOMINALGAIN(int qmfbid, int numlvls, int lvlno, int orient);

/* Get the coding pass type. */
int JPC_PASSTYPE(int passno);

/* Get the segment type. */
int JPC_SEGTYPE(int passno, int firstpassno, int bypass);

/* Get the number of coding passess in the segment. */
int JPC_SEGPASSCNT(int passno, int firstpassno, int numpasses, int bypass,
  int termall);

/* Is the coding pass terminated? */
int JPC_ISTERMINATED(int passno, int firstpassno, int numpasses, int termall,
  int lazy);

#endif