vorbis/vq/vqgen.h

/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE.  *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
 * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE.    *
 * PLEASE READ THESE TERMS DISTRIBUTING.                            *
 *                                                                  *
 * THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-2000             *
 * by Monty <monty@xiph.org> and The XIPHOPHORUS Company            *
 * http://www.xiph.org/                                             *
 *                                                                  *
 ********************************************************************

 function: build a VQ codebook 
 last mod: $Id: vqgen.h,v 1.12.4.3 2000/04/21 16:35:41 xiphmont Exp $

 ********************************************************************/

#ifndef _VQGEN_H_
#define _VQGEN_H_

typedef struct vqgen{
  int it;
  int elements;

  int aux;
  double mindist;

  /* point cache */
  double *pointlist; 
  long   points;
  long   allocated;

  /* entries */
  double *entrylist;
  long   *assigned;
  double *bias;
  long   entries;
  double *max;
  

  double  (*metric_func) (struct vqgen *v,double *entry,double *point);
  double *(*weight_func) (struct vqgen *v,double *point);
} vqgen;

typedef struct {
  long   min;       /* packed 24 bit float */       
  long   delta;     /* packed 24 bit float */       
  int    quant;     /* 0 < quant <= 16 */
  int    sequencep; /* bitflag */
} quant_meta;

static inline double *_point(vqgen *v,long ptr){
  return v->pointlist+((v->elements+v->aux)*ptr);
}

static inline double *_aux(vqgen *v,long ptr){
  return _point(v,ptr)+v->aux;
}

static inline double *_now(vqgen *v,long ptr){
  return v->entrylist+(v->elements*ptr);
}

extern void vqgen_init(vqgen *v,
		       int elements,int aux,int entries,double mindist,
		       double  (*metric)(vqgen *,double *, double *),
		       double *(*weight)(vqgen *,double *));
extern void vqgen_addpoint(vqgen *v, double *p,double *aux);

extern double vqgen_iterate(vqgen *v,int biasp);
extern void vqgen_unquantize(vqgen *v,quant_meta *q);
extern void vqgen_quantize(vqgen *v,quant_meta *q);
extern void vqgen_cellmetric(vqgen *v);

#endif