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-rw-r--r--vorbis/vq/vqgen.h84
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+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
+ * by the Xiph.Org Foundation http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: build a VQ codebook
+
+ ********************************************************************/
+
+#ifndef _VQGEN_H_
+#define _VQGEN_H_
+
+typedef struct vqgen{
+ int seeded;
+ int sorted;
+
+ int it;
+ int elements;
+
+ int aux;
+ float mindist;
+ int centroid;
+
+ /* point cache */
+ float *pointlist;
+ long points;
+ long allocated;
+
+ /* entries */
+ float *entrylist;
+ long *assigned;
+ float *bias;
+ long entries;
+ float *max;
+
+ float (*metric_func) (struct vqgen *v,float *entry,float *point);
+ float *(*weight_func) (struct vqgen *v,float *point);
+
+ FILE *asciipoints;
+} vqgen;
+
+typedef struct {
+ long min; /* packed 24 bit float */
+ long delta; /* packed 24 bit float */
+ int quant; /* 0 < quant <= 16 */
+ int sequencep; /* bitflag */
+} quant_meta;
+
+static inline float *_point(vqgen *v,long ptr){
+ return v->pointlist+((v->elements+v->aux)*ptr);
+}
+
+static inline float *_aux(vqgen *v,long ptr){
+ return _point(v,ptr)+v->aux;
+}
+
+static inline float *_now(vqgen *v,long ptr){
+ return v->entrylist+(v->elements*ptr);
+}
+
+extern void vqgen_init(vqgen *v,
+ int elements,int aux,int entries,float mindist,
+ float (*metric)(vqgen *,float *, float *),
+ float *(*weight)(vqgen *,float *),int centroid);
+extern void vqgen_addpoint(vqgen *v, float *p,float *aux);
+
+extern float vqgen_iterate(vqgen *v,int biasp);
+extern void vqgen_unquantize(vqgen *v,quant_meta *q);
+extern void vqgen_quantize(vqgen *v,quant_meta *q);
+extern void vqgen_cellmetric(vqgen *v);
+
+#endif
+
+
+
+
+