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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 16037 2009-05-26 21:10:58Z 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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83
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84
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