1 /******************************************************************** 2 * * 3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * 7 * * 8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 * 9 * by the Xiph.Org Foundation http://www.xiph.org/ * 10 * * 11 ******************************************************************** 12 13 function: build a VQ codebook 14 last mod: $Id: vqgen.h 16037 2009-05-26 21:10:58Z xiphmont $ 15 16 ********************************************************************/ 17 18 #ifndef _VQGEN_H_ 19 #define _VQGEN_H_ 20 21 typedef struct vqgen{ 22 int seeded; 23 int sorted; 24 25 int it; 26 int elements; 27 28 int aux; 29 float mindist; 30 int centroid; 31 32 /* point cache */ 33 float *pointlist; 34 long points; 35 long allocated; 36 37 /* entries */ 38 float *entrylist; 39 long *assigned; 40 float *bias; 41 long entries; 42 float *max; 43 44 float (*metric_func) (struct vqgen *v,float *entry,float *point); 45 float *(*weight_func) (struct vqgen *v,float *point); 46 47 FILE *asciipoints; 48 } vqgen; 49 50 typedef struct { 51 long min; /* packed 24 bit float */ 52 long delta; /* packed 24 bit float */ 53 int quant; /* 0 < quant <= 16 */ 54 int sequencep; /* bitflag */ 55 } quant_meta; 56 57 static inline float *_point(vqgen *v,long ptr){ 58 return v->pointlist+((v->elements+v->aux)*ptr); 59 } 60 61 static inline float *_aux(vqgen *v,long ptr){ 62 return _point(v,ptr)+v->aux; 63 } 64 65 static inline float *_now(vqgen *v,long ptr){ 66 return v->entrylist+(v->elements*ptr); 67 } 68 69 extern void vqgen_init(vqgen *v, 70 int elements,int aux,int entries,float mindist, 71 float (*metric)(vqgen *,float *, float *), 72 float *(*weight)(vqgen *,float *),int centroid); 73 extern void vqgen_addpoint(vqgen *v, float *p,float *aux); 74 75 extern float vqgen_iterate(vqgen *v,int biasp); 76 extern void vqgen_unquantize(vqgen *v,quant_meta *q); 77 extern void vqgen_quantize(vqgen *v,quant_meta *q); 78 extern void vqgen_cellmetric(vqgen *v); 79 80 #endif 81 82 83 84 85 86
