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