/src/jasper/src/libjasper/jpc/jpc_t1cod.h

Source
/*
 * 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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 * JasPer License Version 2.0
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 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
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/*
 * $Id$
 */

#ifndef JPC_T1COD_H
#define JPC_T1COD_H

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

#include "jpc_fix.h"
#include "jpc_mqcod.h"
#include "jpc_tsfb.h"
#include "jasper/jas_math.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.
 */

enum jpc_segtype {
  /** Invalid. */
  JPC_SEG_INVALID,

  /* MQ. */
  JPC_SEG_MQ,

  /* Raw. */
  JPC_SEG_RAW,
};

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

/* Tier-1 coding pass types. */
enum jpc_passtype {
  JPC_SIGPASS, /*< significance */
  JPC_REFPASS, /*< refinement */
  JPC_CLNPASS, /*< 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 uint_least8_t jpc_zcctxnolut[];
extern bool jpc_spblut[];
extern uint_least8_t jpc_scctxnolut[];
extern uint_least8_t 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.
\******************************************************************************/

/* Arithmetic shift right (with ability to shift left also). */
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t JPC_ASR(jpc_fix_t x, int n)
{
  return n >= 0
    ? x >> n
    : x << -n;
}

/* Get the zero coding context. */
JAS_ATTRIBUTE_CONST
static inline uint_least8_t JPC_GETZCCTXNO(unsigned f, enum jpc_tsfb_orient orient)
{
  return jpc_zcctxnolut[((unsigned)orient << 8) | (f & JPC_OTHSIGMSK)];
}

/* Get the sign prediction bit. */
JAS_ATTRIBUTE_CONST
static inline bool JPC_GETSPB(unsigned f)
{
  return jpc_spblut[(f & (JPC_PRIMSIGMSK | JPC_SGNMSK)) >> 4];
}

/* Get the sign coding context. */
JAS_ATTRIBUTE_CONST
static inline uint_least8_t JPC_GETSCCTXNO(unsigned f)
{
  return jpc_scctxnolut[(f & (JPC_PRIMSIGMSK | JPC_SGNMSK)) >> 4];
}

/* Get the magnitude context. */
JAS_ATTRIBUTE_CONST
static inline uint_least8_t JPC_GETMAGCTXNO(unsigned f)
{
  return jpc_magctxnolut[(f & JPC_OTHSIGMSK) | (((f & JPC_REFINE) != 0) << 11)];
}

/* Get the normalized MSE reduction for significance passes. */
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t JPC_GETSIGNMSEDEC(jpc_fix_t x, int bitpos)
{
  return 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. */
JAS_ATTRIBUTE_CONST
static inline jpc_fix_t JPC_GETREFNMSEDEC(jpc_fix_t x, int bitpos)
{
  return 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)];
}

/* Update the per-sample state information. */
static inline void JPC_UPDATEFLAGS4(jpc_fix_t *fp, unsigned rowstep, bool s, bool vcausalflag)
{
  jpc_fix_t *np = fp - rowstep;
  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);

void jpc_initmqctxs(void);

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

/* Get the coding pass type. */
JAS_ATTRIBUTE_CONST
enum jpc_passtype JPC_PASSTYPE(unsigned passno);

/* Get the segment type. */
JAS_ATTRIBUTE_CONST
enum jpc_segtype JPC_SEGTYPE(unsigned passno, unsigned firstpassno, bool bypass);

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

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

#endif

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Created: 2026-04-01 07:49