1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
9 * by the XIPHOPHORUS Company http://www.xiph.org/ *
11 ********************************************************************
13 function: metrics and quantization code for residue VQ codebooks
14 last mod: $Id: residuedata.c,v 1.9 2001/02/26 03:51:12 xiphmont Exp $
16 ********************************************************************/
24 #include "../lib/scales.h"
28 char *vqext_booktype="RESdata";
29 quant_meta q={0,0,0,0}; /* set sequence data */
32 static float *quant_save=NULL;
34 float *vqext_weight(vqgen *v,float *p){
38 /* quantize aligned on unit boundaries. Because our grid is likely
39 very coarse, play 'shuffle the blocks'; don't allow multiple
40 entries to fill the same spot as is nearly certain to happen. */
42 void vqext_quantize(vqgen *v,quant_meta *q){
47 float *test=alloca(sizeof(float)*dim);
51 /* allow movement only to unoccupied coordinates on the coarse grid */
54 float val=_now(v,j)[k];
55 float norm=rint(fabs(val)/scalequant);
60 /* allow move only if unoccupied */
63 if(j!=k && memcmp(test,quant_save+dim*k,dim*sizeof(float))==0)
66 if(memcmp(test,quant_save+dim*j,dim*sizeof(float)))
68 memcpy(quant_save+dim*j,test,sizeof(float)*dim);
71 memcpy(_now(v,j),test,sizeof(float)*dim);
75 /* unlike the other trainers, we fill in our quantization
76 information (as we know granularity beforehand and don't need to
79 q->min=_float32_pack(0.f);
80 q->delta=_float32_pack(scalequant);
84 memcpy(_now(v,0),quant_save,sizeof(float)*dim*n);
85 fprintf(stderr,"cells shifted this iteration: %d\n",moved);
89 /* candidate,actual */
90 float vqext_metric(vqgen *v,float *e, float *p){
93 for(i=0;i<v->elements;i++){
100 /* We don't interleave here; we assume that the interleave is provided
101 for us by residuesplit in vorbis/huff/ */
102 void vqext_addpoint_adj(vqgen *v,float *b,int start,int dim,int cols,int num){
103 vqgen_addpoint(v,b+start,NULL);
106 /* need to reseed because of the coarse quantization we tend to use on
107 residuals (which causes lots & lots of dupes) */
108 void vqext_preprocess(vqgen *v){
110 float *test=alloca(sizeof(float)*v->elements);
113 vqext_quantize(v,&q);
114 vqgen_unquantize(v,&q);
116 /* if there are any dupes, reseed */
117 for(k=0;k<v->entries;k++){
119 if(memcmp(_now(v,k),_now(v,l),sizeof(float)*v->elements)==0)
126 fprintf(stderr,"reseeding with quantization....\n");
128 /* seed the inputs to input points, but points on unit boundaries,
129 ignoring quantbits for now, making sure each seed is unique */
131 for(i=0,j=0;i<v->points && j<v->entries;i++){
132 for(k=0;k<v->elements;k++){
133 float val=_point(v,i)[k];
134 test[k]=rint(val/scalequant)*scalequant;
138 for(k=0;k<v->elements;k++)
139 if(test[k]!=_now(v,l)[k])
141 if(k==v->elements)break;
144 memcpy(_now(v,j),test,v->elements*sizeof(float));
150 fprintf(stderr,"Not enough unique entries after prequantization\n");
154 vqext_quantize(v,&q);
155 quant_save=_ogg_malloc(sizeof(float)*v->elements*v->entries);
156 memcpy(quant_save,_now(v,0),sizeof(float)*v->elements*v->entries);
157 vqgen_unquantize(v,&q);