jpc_enc.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_ENC_H
#define JPC_ENC_H

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

#include "jasper/jas_seq.h"

#include "jpc_t2cod.h"
#include "jpc_mqenc.h"
#include "jpc_cod.h"
#include "jpc_tagtree.h"
#include "jpc_cs.h"
#include "jpc_flt.h"
#include "jpc_tsfb.h"

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

/* The number of bits used in various lookup tables. */
#define	JPC_NUMEXTRABITS	JPC_NMSEDEC_FRACBITS

/* An invalid R-D slope value. */
#define	JPC_BADRDSLOPE	(-1)

/******************************************************************************\
* Coding parameters types.
\******************************************************************************/

/* Per-component coding paramters. */

typedef struct {

	/* The horizontal sampling period. */
	uint_fast8_t sampgrdstepx;

	/* The vertical sampling period. */
	uint_fast8_t sampgrdstepy;

	/* The sample alignment horizontal offset. */
	uint_fast8_t sampgrdsubstepx;

	/* The sample alignment vertical offset. */
	uint_fast8_t sampgrdsubstepy;

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

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

	/* The number of step sizes. */
	uint_fast16_t numstepsizes;

	/* The quantizer step sizes. */
	uint_fast16_t stepsizes[JPC_MAXBANDS];

} jpc_enc_ccp_t;

/* Per-tile coding parameters. */

typedef struct {

	/* The coding mode. */
	bool intmode;

	/* The coding style (i.e., SOP, EPH). */
	uint_fast8_t csty;

	/* The progression order. */
	uint_fast8_t prg;

	/* The multicomponent transform. */
	uint_fast8_t mctid;

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

	/* The normalized bit rates associated with the various
	  intermediate layers. */
	jpc_fix_t *ilyrrates;

} jpc_enc_tcp_t;

/* Per tile-component coding parameters. */

typedef struct {

	/* The coding style (i.e., explicit precinct sizes). */
	uint_fast8_t csty;

	/* The maximum number of resolution levels allowed. */
	uint_fast8_t maxrlvls;

	/* The exponent for the nominal code block width. */
	uint_fast16_t cblkwidthexpn;

	/* The exponent for the nominal code block height. */
	uint_fast16_t cblkheightexpn;

	/* The code block style parameters (e.g., lazy, terminate all,
	  segmentation symbols, causal, reset probability models). */
	uint_fast8_t cblksty;

	/* The QMFB. */
	uint_fast8_t qmfbid;

	/* The precinct width values. */
	uint_fast16_t prcwidthexpns[JPC_MAXRLVLS];

	/* The precinct height values. */
	uint_fast16_t prcheightexpns[JPC_MAXRLVLS];

	/* The number of guard bits. */
	uint_fast8_t numgbits;

} jpc_enc_tccp_t;

/* Coding parameters. */

typedef struct {

	/* The debug level. */
	int debug;

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

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

	/* The horizontal offset from the origin of the reference grid to the
	  right edge of the image area (plus one). */
	uint_fast32_t refgrdwidth;

	/* The vertical offset from the origin of the reference grid to the
	  bottom edge of the image area (plus one). */
	uint_fast32_t refgrdheight;

	/* The horizontal offset from the origin of the tile grid to the
	  origin of the reference grid. */
	uint_fast32_t tilegrdoffx;

	/* The vertical offset from the origin of the tile grid to the
	  origin of the reference grid. */
	uint_fast32_t tilegrdoffy;

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

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

	/* The number of tiles spanning the image area in the horizontal
	  direction. */
	uint_fast32_t numhtiles;

	/* The number of tiles spanning the image area in the vertical
	  direction. */
	uint_fast32_t numvtiles;

	/* The number of tiles. */
	uint_fast32_t numtiles;

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

	/* The per-component coding parameters. */
	jpc_enc_ccp_t *ccps;

	/* The per-tile coding parameters. */
	jpc_enc_tcp_t tcp;

	/* The per-tile-component coding parameters. */
	jpc_enc_tccp_t tccp;

	/* The target code stream length in bytes. */
	uint_fast32_t totalsize;

	/* The raw (i.e., uncompressed) size of the image in bytes. */
	uint_fast32_t rawsize;

} jpc_enc_cp_t;

/******************************************************************************\
* Encoder class.
\******************************************************************************/

/* Encoder per-coding-pass state information. */

typedef struct {

	/* The starting offset for this pass. */
	int start;

	/* The ending offset for this pass. */
	int end;

	/* The type of data in this pass (i.e., MQ or raw). */
	int type;

	/* Flag indicating that this pass is terminated. */
	int term;

	/* The entropy coder state after coding this pass. */
	jpc_mqencstate_t mqencstate;

	/* The layer to which this pass has been assigned. */
	int lyrno;

	/* The R-D slope for this pass. */
	jpc_flt_t rdslope;

	/* The weighted MSE reduction associated with this pass. */
	jpc_flt_t wmsedec;

	/* The cumulative weighted MSE reduction. */
	jpc_flt_t cumwmsedec;

	/* The normalized MSE reduction. */
	long nmsedec;

} jpc_enc_pass_t;

/* Encoder per-code-block state information. */

typedef struct {