85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
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* by the Xiph.Org Foundation http://www.xiph.org/ *
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* *
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********************************************************************
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function: build a VQ codebook
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********************************************************************/
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#ifndef _VQGEN_H_
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#define _VQGEN_H_
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typedef struct vqgen{
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int seeded;
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int sorted;
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int it;
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int elements;
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int aux;
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float mindist;
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int centroid;
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/* point cache */
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float *pointlist;
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long points;
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long allocated;
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/* entries */
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float *entrylist;
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long *assigned;
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float *bias;
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long entries;
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float *max;
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float (*metric_func) (struct vqgen *v,float *entry,float *point);
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float *(*weight_func) (struct vqgen *v,float *point);
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FILE *asciipoints;
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} vqgen;
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typedef struct {
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long min; /* packed 24 bit float */
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long delta; /* packed 24 bit float */
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int quant; /* 0 < quant <= 16 */
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int sequencep; /* bitflag */
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} quant_meta;
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static inline float *_point(vqgen *v,long ptr){
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return v->pointlist+((v->elements+v->aux)*ptr);
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}
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static inline float *_aux(vqgen *v,long ptr){
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return _point(v,ptr)+v->aux;
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}
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static inline float *_now(vqgen *v,long ptr){
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return v->entrylist+(v->elements*ptr);
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}
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extern void vqgen_init(vqgen *v,
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int elements,int aux,int entries,float mindist,
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float (*metric)(vqgen *,float *, float *),
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float *(*weight)(vqgen *,float *),int centroid);
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extern void vqgen_addpoint(vqgen *v, float *p,float *aux);
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extern float vqgen_iterate(vqgen *v,int biasp);
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extern void vqgen_unquantize(vqgen *v,quant_meta *q);
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extern void vqgen_quantize(vqgen *v,quant_meta *q);
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extern void vqgen_cellmetric(vqgen *v);
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#endif
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