| 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 http://www.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 | last mod: $Id: vqgen.h 13293 2007-07-24 00:09:47Z xiphmont $ |
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| 15 | |
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| 16 | ********************************************************************/ |
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| 17 | |
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| 18 | #ifndef _VQGEN_H_ |
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| 19 | #define _VQGEN_H_ |
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| 20 | |
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| 21 | typedef struct vqgen{ |
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| 22 | int seeded; |
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| 23 | int sorted; |
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| 24 | |
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| 25 | int it; |
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| 26 | int elements; |
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| 27 | |
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| 28 | int aux; |
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| 29 | float mindist; |
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| 30 | int centroid; |
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| 31 | |
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| 32 | /* point cache */ |
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| 33 | float *pointlist; |
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| 34 | long points; |
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| 35 | long allocated; |
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| 36 | |
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| 37 | /* entries */ |
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| 38 | float *entrylist; |
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| 39 | long *assigned; |
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| 40 | float *bias; |
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| 41 | long entries; |
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| 42 | float *max; |
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| 43 | |
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| 44 | float (*metric_func) (struct vqgen *v,float *entry,float *point); |
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| 45 | float *(*weight_func) (struct vqgen *v,float *point); |
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| 46 | |
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| 47 | FILE *asciipoints; |
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| 48 | } vqgen; |
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| 49 | |
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| 50 | typedef struct { |
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| 51 | long min; /* packed 24 bit float */ |
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| 52 | long delta; /* packed 24 bit float */ |
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| 53 | int quant; /* 0 < quant <= 16 */ |
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| 54 | int sequencep; /* bitflag */ |
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| 55 | } quant_meta; |
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| 56 | |
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| 57 | static inline float *_point(vqgen *v,long ptr){ |
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| 58 | return v->pointlist+((v->elements+v->aux)*ptr); |
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| 59 | } |
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| 60 | |
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| 61 | static inline float *_aux(vqgen *v,long ptr){ |
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| 62 | return _point(v,ptr)+v->aux; |
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| 63 | } |
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| 64 | |
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| 65 | static inline float *_now(vqgen *v,long ptr){ |
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| 66 | return v->entrylist+(v->elements*ptr); |
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| 67 | } |
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| 68 | |
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| 69 | extern void vqgen_init(vqgen *v, |
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| 70 | int elements,int aux,int entries,float mindist, |
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| 71 | float (*metric)(vqgen *,float *, float *), |
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| 72 | float *(*weight)(vqgen *,float *),int centroid); |
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| 73 | extern void vqgen_addpoint(vqgen *v, float *p,float *aux); |
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| 74 | |
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| 75 | extern float vqgen_iterate(vqgen *v,int biasp); |
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| 76 | extern void vqgen_unquantize(vqgen *v,quant_meta *q); |
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| 77 | extern void vqgen_quantize(vqgen *v,quant_meta *q); |
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| 78 | extern void vqgen_cellmetric(vqgen *v); |
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| 79 | |
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| 80 | #endif |
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| 81 | |
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| 82 | |
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| 83 | |
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| 84 | |
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| 85 | |
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