coder.h

好东西呢

#ifndef CODER_H
#define CODER_H

/***

***/

#include <crblib/arithc.h>

#define arithBit	arithEncBitRaw
#define arithGetBit	arithDecBitRaw

typedef struct _image image;
typedef struct _coder coder;
typedef struct _quantInfo quantInfo;
typedef struct _wavelet wavelet;
typedef struct _subband subband;
typedef struct _subband_leaf subband_leaf;

typedef void (*coder_init) (void *);
typedef void (*coder_free) (void *);
typedef void (*coder_encodeBand) (void *,int *,int,int,int,int *);
typedef void (*coder_decodeBand) (void *,int *,int,int,int,int *);
typedef void (*coder_flush) (void *);
typedef void (*coder_encodeBandBP) (void *,int *,int,int,int,int *,int);
typedef void (*coder_decodeBandBP) (void *,int *,int,int,int,int *,int);
typedef void (*coder_encodeBandZT) (void *,int *,int,int,int,int,int **);
typedef void (*coder_decodeBandZT) (void *,int *,int,int,int,int,int **);
typedef void (*coder_encodeSubbandBP) (void *,subband_leaf *,int);
typedef void (*coder_decodeSubbandBP) (void *,subband_leaf *,int);

struct _wavelet {
	int complen,levels;
	int width,height,planes;
	int stoplen,stopline;
	const coder * coder_template;
	ubyte * comp;
	image *im;

	/* these are not necessarily set up if you did not use
	*	the wavelet to do the quantizing and transforming
	**/

	quantInfo *qi;
	int transform;
	subband *subband_root;
};

typedef struct _coder {
	const char * name;
	coder_init init;
	coder_free free;

		/** one family of pairs must be provided : **/
	coder_encodeBand encodeBand;
	coder_decodeBand decodeBand;
	coder_encodeBandBP encodeBandBP;	
	coder_decodeBandBP decodeBandBP;
	coder_encodeBandZT encodeBandZT;	
	coder_decodeBandZT decodeBandZT;
	coder_encodeSubbandBP encodeSubbandBP;	
	coder_decodeSubbandBP decodeSubbandBP;

	coder_flush flush;	/** optional ; set to null if you need no flushing **/
	void * data;	/** setup by init, killed by free **/

	arithInfo * arith;	/** controlled by the global coder routines **/
	wavelet *w;
} coder;

extern wavelet * newWavelet(const image *template,int levels);
extern void freeWavelet(wavelet *w);
extern void waveletRealloc(wavelet *w);	// call after complen is set correctly

extern coder * coder_create_write(const coder *template,wavelet *w,int stoplen);
extern coder * coder_create_read( wavelet *w);
extern void coder_flush_write(coder *);
extern void coder_flush_read(coder *);
extern void coder_destroy(coder *);

#define coder_getpos(c)			arithTellEncPos(c->arith)
#define coder_getposd(c)		arithTellDecPos(c->arith)
#define coder_timetostop(c)		( coder_getpos(c)  >= (c)->w->stoplen )
#define coder_timetostopd(c,y)	( coder_getposd(c) >= (c)->w->stoplen )
//#define coder_timetostopd(c,y)	( ( coder_getposd(c) >= (c)->w->stoplen && ((y) == (c)->w->stopline) ) || ( (coder_getposd(c)) >= (c)->w->stoplen && (y) == 0 ) )
#define coder_didstop(c,y)		do { if ( (c)->w->stopline < 0 ) (c)->w->stopline = y; } while(0);
	/** getposd makes sure we're in the same band, but isn't reliable for picking the
	** right line because of the hidden 4 bytes in the arithcoder state variables
	**	we need the 'or' in later bands (if we stop before the last)
	***/

extern void coder_encodeDPCM(coder *c,int *plane,int width,int height,int rowpad);
extern void coder_decodeDPCM(coder *c,int *plane,int width,int height,int rowpad);

// some order -1 routines for your convenience:

extern void encode_m1(arithInfo * ari,int sym);
extern int  decode_m1(arithInfo *ari);

/**** zero tree flags : *****/

#define BASE_SHIFT				29
#define FLAG_ISOLATED_ZERO		(1<<(BASE_SHIFT))
#define FLAG_CHILD_ZERO			(1<<(BASE_SHIFT-1))
#define FLAG_ALREADY_DECODED	FLAG_CHILD_ZERO
#define CODE_MAX_BPN			(BASE_SHIFT-2)
#define CODE_MAX_VAL			(1<<CODE_MAX_BPN)

// a common coding question:
#define signbit(x)	(isneg(x)?1:0)

/**** the mother-list of all coders : ***/

extern const num_coders;
extern const coder * coder_list[];

/*** tune me ! **/

extern int tune_param;

#endif //CODER_H