jpc_enc.c

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) 2001-2003 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer Software License
 * 
 * IMAGE POWER JPEG-2000 PUBLIC LICENSE
 * ************************************
 * 
 * GRANT:
 * 
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 * 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),
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 * License Conditions
 * ******************
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 * MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
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 * __END_OF_JASPER_LICENSE__
 */

/*
 * $Id$
 */

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

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <float.h>

#include "jasper/jas_string.h"
#include "jasper/jas_malloc.h"
#include "jasper/jas_image.h"
#include "jasper/jas_fix.h"
#include "jasper/jas_tvp.h"
#include "jasper/jas_version.h"
#include "jasper/jas_math.h"
#include "jasper/jas_debug.h"

#include "jpc_flt.h"
#include "jpc_fix.h"
#include "jpc_tagtree.h"
#include "jpc_enc.h"
#include "jpc_cs.h"
#include "jpc_mct.h"
#include "jpc_tsfb.h"
#include "jpc_qmfb.h"
#include "jpc_t1enc.h"
#include "jpc_t2enc.h"
#include "jpc_cod.h"
#include "jpc_math.h"
#include "jpc_util.h"

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

#define JPC_POW2(n) \
	(1 << (n))

#define JPC_FLOORTOMULTPOW2(x, n) \
  (((n) > 0) ? ((x) & (~((1 << n) - 1))) : (x))
/* Round to the nearest multiple of the specified power of two in the
  direction of negative infinity. */

#define	JPC_CEILTOMULTPOW2(x, n) \
  (((n) > 0) ? JPC_FLOORTOMULTPOW2(((x) + (1 << (n)) - 1), n) : (x))
/* Round to the nearest multiple of the specified power of two in the
  direction of positive infinity. */

#define	JPC_POW2(n)	\
  (1 << (n))

jpc_enc_tile_t *jpc_enc_tile_create(jpc_enc_cp_t *cp, jas_image_t *image, int tileno);
void jpc_enc_tile_destroy(jpc_enc_tile_t *tile);

static jpc_enc_tcmpt_t *tcmpt_create(jpc_enc_tcmpt_t *tcmpt, jpc_enc_cp_t *cp,
  jas_image_t *image, jpc_enc_tile_t *tile);
static void tcmpt_destroy(jpc_enc_tcmpt_t *tcmpt);
static jpc_enc_rlvl_t *rlvl_create(jpc_enc_rlvl_t *rlvl, jpc_enc_cp_t *cp,
  jpc_enc_tcmpt_t *tcmpt, jpc_tsfb_band_t *bandinfos);
static void rlvl_destroy(jpc_enc_rlvl_t *rlvl);
static jpc_enc_band_t *band_create(jpc_enc_band_t *band, jpc_enc_cp_t *cp,
  jpc_enc_rlvl_t *rlvl, jpc_tsfb_band_t *bandinfos);
static void band_destroy(jpc_enc_band_t *bands);
static jpc_enc_prc_t *prc_create(jpc_enc_prc_t *prc, jpc_enc_cp_t *cp,
  jpc_enc_band_t *band);
static void prc_destroy(jpc_enc_prc_t *prcs);
static jpc_enc_cblk_t *cblk_create(jpc_enc_cblk_t *cblk, jpc_enc_cp_t *cp,
  jpc_enc_prc_t *prc);
static void cblk_destroy(jpc_enc_cblk_t *cblks);
int ratestrtosize(char *s, uint_fast32_t rawsize, uint_fast32_t *size);
static void pass_destroy(jpc_enc_pass_t *pass);
void jpc_enc_dump(jpc_enc_t *enc);

/******************************************************************************\
* Local prototypes.
\******************************************************************************/

int dump_passes(jpc_enc_pass_t *passes, int numpasses, jpc_enc_cblk_t *cblk);
void calcrdslopes(jpc_enc_cblk_t *cblk);
void dump_layeringinfo(jpc_enc_t *enc);
static int jpc_calcssexp(jpc_fix_t stepsize);
static int jpc_calcssmant(jpc_fix_t stepsize);
void quantize(jas_matrix_t *data, jpc_fix_t stepsize);
static int jpc_enc_encodemainhdr(jpc_enc_t *enc);
static int jpc_enc_encodemainbody(jpc_enc_t *enc);
int jpc_enc_encodetiledata(jpc_enc_t *enc);
jpc_enc_t *jpc_enc_create(jpc_enc_cp_t *cp, jas_stream_t *out, jas_image_t *image);
void jpc_enc_destroy(jpc_enc_t *enc);
static int jpc_enc_encodemainhdr(jpc_enc_t *enc);
static int jpc_enc_encodemainbody(jpc_enc_t *enc);
int jpc_enc_encodetiledata(jpc_enc_t *enc);
int rateallocate(jpc_enc_t *enc, int numlyrs, uint_fast32_t *cumlens);
int setins(int numvalues, jpc_flt_t *values, jpc_flt_t value);
static jpc_enc_cp_t *cp_create(char *optstr, jas_image_t *image);
void jpc_enc_cp_destroy(jpc_enc_cp_t *cp);
static uint_fast32_t jpc_abstorelstepsize(jpc_fix_t absdelta, int scaleexpn);

static uint_fast32_t jpc_abstorelstepsize(jpc_fix_t absdelta, int scaleexpn)
{
	int p;
	uint_fast32_t mant;
	uint_fast32_t expn;
	int n;

	if (absdelta < 0) {
		abort();
	}

	p = jpc_firstone(absdelta) - JPC_FIX_FRACBITS;
	n = 11 - jpc_firstone(absdelta);
	mant = ((n < 0) ? (absdelta >> (-n)) : (absdelta << n)) & 0x7ff;
	expn = scaleexpn - p;
	if (scaleexpn < p) {
		abort();
	}
	return JPC_QCX_EXPN(expn) | JPC_QCX_MANT(mant);
}

typedef enum {
	OPT_DEBUG,
	OPT_IMGAREAOFFX,
	OPT_IMGAREAOFFY,
	OPT_TILEGRDOFFX,
	OPT_TILEGRDOFFY,
	OPT_TILEWIDTH,
	OPT_TILEHEIGHT,
	OPT_PRCWIDTH,
	OPT_PRCHEIGHT,
	OPT_CBLKWIDTH,
	OPT_CBLKHEIGHT,
	OPT_MODE,
	OPT_PRG,
	OPT_NOMCT,
	OPT_MAXRLVLS,
	OPT_SOP,
	OPT_EPH,
	OPT_LAZY,
	OPT_TERMALL,
	OPT_SEGSYM,
	OPT_VCAUSAL,
	OPT_RESET,
	OPT_PTERM,
	OPT_NUMGBITS,
	OPT_RATE,
	OPT_ILYRRATES,
	OPT_JP2OVERHEAD
} optid_t;

jas_taginfo_t encopts[] = {
	{OPT_DEBUG, "debug"},
	{OPT_IMGAREAOFFX, "imgareatlx"},
	{OPT_IMGAREAOFFY, "imgareatly"},
	{OPT_TILEGRDOFFX, "tilegrdtlx"},
	{OPT_TILEGRDOFFY, "tilegrdtly"},
	{OPT_TILEWIDTH, "tilewidth"},
	{OPT_TILEHEIGHT, "tileheight"},
	{OPT_PRCWIDTH, "prcwidth"},
	{OPT_PRCHEIGHT, "prcheight"},
	{OPT_CBLKWIDTH, "cblkwidth"},
	{OPT_CBLKHEIGHT, "cblkheight"},
	{OPT_MODE, "mode"},
	{OPT_PRG, "prg"},
	{OPT_NOMCT, "nomct"},
	{OPT_MAXRLVLS, "numrlvls"},
	{OPT_SOP, "sop"},
	{OPT_EPH, "eph"},
	{OPT_LAZY, "lazy"},
	{OPT_TERMALL, "termall"},
	{OPT_SEGSYM, "segsym"},
	{OPT_VCAUSAL, "vcausal"},
	{OPT_PTERM, "pterm"},
	{OPT_RESET, "resetprob"},
	{OPT_NUMGBITS, "numgbits"},
	{OPT_RATE, "rate"},
	{OPT_ILYRRATES, "ilyrrates"},
	{OPT_JP2OVERHEAD, "_jp2overhead"},
	{-1, 0}
};

typedef enum {
	PO_L = 0,
	PO_R
} poid_t;


jas_taginfo_t prgordtab[] = {
	{JPC_COD_LRCPPRG, "lrcp"},
	{JPC_COD_RLCPPRG, "rlcp"},
	{JPC_COD_RPCLPRG, "rpcl"},
	{JPC_COD_PCRLPRG, "pcrl"},
	{JPC_COD_CPRLPRG, "cprl"},
	{-1, 0}
};

typedef enum {
	MODE_INT,
	MODE_REAL
} modeid_t;

jas_taginfo_t modetab[] = {
	{MODE_INT, "int"},
	{MODE_REAL, "real"},
	{-1, 0}
};

/******************************************************************************\
* The main encoder entry point.
\******************************************************************************/

int jpc_encode(jas_image_t *image, jas_stream_t *out, char *optstr)
{
	jpc_enc_t *enc;
	jpc_enc_cp_t *cp;

	enc = 0;
	cp = 0;

	jpc_initluts();

	if (!(cp = cp_create(optstr, image))) {
		fprintf(stderr, "invalid JP encoder options\n");
		goto error;
	}

	if (!(enc = jpc_enc_create(cp, out, image))) {
		goto error;
	}
	cp = 0;

	/* Encode the main header. */
	if (jpc_enc_encodemainhdr(enc)) {
		goto error;
	}

	/* Encode the main body.  This constitutes most of the encoding work. */
	if (jpc_enc_encodemainbody(enc)) {
		goto error;
	}

	/* Write EOC marker segment. */
	if (!(enc->mrk = jpc_ms_create(JPC_MS_EOC))) {
		goto error;
	}
	if (jpc_putms(enc->out, enc->cstate, enc->mrk)) {
		fprintf(stderr, "cannot write EOI marker\n");
		goto error;
	}
	jpc_ms_destroy(enc->mrk);
	enc->mrk = 0;

	if (jas_stream_flush(enc->out)) {
		goto error;
	}

	jpc_enc_destroy(enc);

	return 0;

error:
	if (cp) {
		jpc_enc_cp_destroy(cp);
	}
	if (enc) {
		jpc_enc_destroy(enc);
	}
	return -1;
}

/******************************************************************************\
* Option parsing code.
\******************************************************************************/

static jpc_enc_cp_t *cp_create(char *optstr, jas_image_t *image)
{
	jpc_enc_cp_t *cp;
	jas_tvparser_t *tvp;
	int ret;
	int numilyrrates;
	double *ilyrrates;
	int i;
	int tagid;
	jpc_enc_tcp_t *tcp;
	jpc_enc_tccp_t *tccp;
	jpc_enc_ccp_t *ccp;
	int cmptno;
	uint_fast16_t rlvlno;
	uint_fast16_t prcwidthexpn;
	uint_fast16_t prcheightexpn;
	bool enablemct;
	uint_fast32_t jp2overhead;
	uint_fast16_t lyrno;
	uint_fast32_t hsteplcm;
	uint_fast32_t vsteplcm;
	bool mctvalid;

	tvp = 0;
	cp = 0;
	ilyrrates = 0;
	numilyrrates = 0;

	if (!(cp = jas_malloc(sizeof(jpc_enc_cp_t)))) {
		goto error;
	}

	prcwidthexpn = 15;
	prcheightexpn = 15;
	enablemct = true;
	jp2overhead = 0;

	cp->ccps = 0;
	cp->debug = 0;
	cp->imgareatlx = UINT_FAST32_MAX;
	cp->imgareatly = UINT_FAST32_MAX;
	cp->refgrdwidth = 0;
	cp->refgrdheight = 0;
	cp->tilegrdoffx = UINT_FAST32_MAX;
	cp->tilegrdoffy = UINT_FAST32_MAX;
	cp->tilewidth = 0;
	cp->tileheight = 0;
	cp->numcmpts = jas_image_numcmpts(image);

	hsteplcm = 1;
	vsteplcm = 1;
	for (cmptno = 0; cmptno < jas_image_numcmpts(image); ++cmptno) {
		if (jas_image_cmptbrx(image, cmptno) + jas_image_cmpthstep(image, cmptno) <=
		  jas_image_brx(image) || jas_image_cmptbry(image, cmptno) +
		  jas_image_cmptvstep(image, cmptno) <= jas_image_bry(image)) {
			fprintf(stderr, "unsupported image type\n");
			goto error;
		}
		/* Note: We ought to be calculating the LCMs here.  Fix some day. */
		hsteplcm *= jas_image_cmpthstep(image, cmptno);
		vsteplcm *= jas_image_cmptvstep(image, cmptno);
	}

	if (!(cp->ccps = jas_malloc(cp->numcmpts * sizeof(jpc_enc_ccp_t)))) {
		goto error;
	}
	for (cmptno = 0, ccp = cp->ccps; cmptno < JAS_CAST(int, cp->numcmpts); ++cmptno,
	  ++ccp) {
		ccp->sampgrdstepx = jas_image_cmpthstep(image, cmptno);
		ccp->sampgrdstepy = jas_image_cmptvstep(image, cmptno);
		/* XXX - this isn't quite correct for more general image */
		ccp->sampgrdsubstepx = 0;
		ccp->sampgrdsubstepx = 0;
		ccp->prec = jas_image_cmptprec(image, cmptno);
		ccp->sgnd = jas_image_cmptsgnd(image, cmptno);
		ccp->numstepsizes = 0;
		memset(ccp->stepsizes, 0, sizeof(ccp->stepsizes));
	}

	cp->rawsize = jas_image_rawsize(image);
	cp->totalsize = UINT_FAST32_MAX;