From 8e94244f86e657e4113e35438e59cf5771882b25 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sun, 3 Mar 2024 12:51:03 +0100
Subject: libogg and libvorbis are no longer part of this source tree

---
 contrib/vorbis/vq/vqgen.c | 566 ----------------------------------------------
 1 file changed, 566 deletions(-)
 delete mode 100644 contrib/vorbis/vq/vqgen.c

(limited to 'contrib/vorbis/vq/vqgen.c')

diff --git a/contrib/vorbis/vq/vqgen.c b/contrib/vorbis/vq/vqgen.c
deleted file mode 100644
index 934d264..0000000
--- a/contrib/vorbis/vq/vqgen.c
+++ /dev/null
@@ -1,566 +0,0 @@
-/********************************************************************
- *                                                                  *
- * 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: train a VQ codebook
-
- ********************************************************************/
-
-/* This code is *not* part of libvorbis.  It is used to generate
-   trained codebooks offline and then spit the results into a
-   pregenerated codebook that is compiled into libvorbis.  It is an
-   expensive (but good) algorithm.  Run it on big iron. */
-
-/* There are so many optimizations to explore in *both* stages that
-   considering the undertaking is almost withering.  For now, we brute
-   force it all */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <math.h>
-#include <string.h>
-
-#include "vqgen.h"
-#include "bookutil.h"
-
-/* Codebook generation happens in two steps:
-
-   1) Train the codebook with data collected from the encoder: We use
-   one of a few error metrics (which represent the distance between a
-   given data point and a candidate point in the training set) to
-   divide the training set up into cells representing roughly equal
-   probability of occurring.
-
-   2) Generate the codebook and auxiliary data from the trained data set
-*/
-
-/* Codebook training ****************************************************
- *
- * The basic idea here is that a VQ codebook is like an m-dimensional
- * foam with n bubbles.  The bubbles compete for space/volume and are
- * 'pressurized' [biased] according to some metric.  The basic alg
- * iterates through allowing the bubbles to compete for space until
- * they converge (if the damping is dome properly) on a steady-state
- * solution. Individual input points, collected from libvorbis, are
- * used to train the algorithm monte-carlo style.  */
-
-/* internal helpers *****************************************************/
-#define vN(data,i) (data+v->elements*i)
-
-/* default metric; squared 'distance' from desired value. */
-float _dist(vqgen *v,float *a, float *b){
-  int i;
-  int el=v->elements;
-  float acc=0.f;
-  for(i=0;i<el;i++){
-    float val=(a[i]-b[i]);
-    acc+=val*val;
-  }
-  return sqrt(acc);
-}
-
-float *_weight_null(vqgen *v,float *a){
-  return a;
-}
-
-/* *must* be beefed up. */
-void _vqgen_seed(vqgen *v){
-  long i;
-  for(i=0;i<v->entries;i++)
-    memcpy(_now(v,i),_point(v,i),sizeof(float)*v->elements);
-  v->seeded=1;
-}
-
-int directdsort(const void *a, const void *b){
-  float av=*((float *)a);
-  float bv=*((float *)b);
-  return (av<bv)-(av>bv);
-}
-
-void vqgen_cellmetric(vqgen *v){
-  int j,k;
-  float min=-1.f,max=-1.f,mean=0.f,acc=0.f;
-  long dup=0,unused=0;
- #ifdef NOISY
-  int i;
-   char buff[80];
-   float spacings[v->entries];
-   int count=0;
-   FILE *cells;
-   sprintf(buff,"cellspace%d.m",v->it);
-   cells=fopen(buff,"w");
-#endif
-
-  /* minimum, maximum, cell spacing */
-  for(j=0;j<v->entries;j++){
-    float localmin=-1.;
-
-    for(k=0;k<v->entries;k++){
-      if(j!=k){
-        float this=_dist(v,_now(v,j),_now(v,k));
-        if(this>0){
-          if(v->assigned[k] && (localmin==-1 || this<localmin))
-            localmin=this;
-        }else{
-          if(k<j){
-            dup++;
-            break;
-          }
-        }
-      }
-    }
-    if(k<v->entries)continue;
-
-    if(v->assigned[j]==0){
-      unused++;
-      continue;
-    }
-
-    localmin=v->max[j]+localmin/2; /* this gives us rough diameter */
-    if(min==-1 || localmin<min)min=localmin;
-    if(max==-1 || localmin>max)max=localmin;
-    mean+=localmin;
-    acc++;
-#ifdef NOISY
-    spacings[count++]=localmin;
-#endif
-  }
-
-  fprintf(stderr,"cell diameter: %.03g::%.03g::%.03g (%ld unused/%ld dup)\n",
-          min,mean/acc,max,unused,dup);
-
-#ifdef NOISY
-  qsort(spacings,count,sizeof(float),directdsort);
-  for(i=0;i<count;i++)
-    fprintf(cells,"%g\n",spacings[i]);
-  fclose(cells);
-#endif
-
-}
-
-/* External calls *******************************************************/
-
-/* We have two forms of quantization; in the first, each vector
-   element in the codebook entry is orthogonal.  Residues would use this
-   quantization for example.
-
-   In the second, we have a sequence of monotonically increasing
-   values that we wish to quantize as deltas (to save space).  We
-   still need to quantize so that absolute values are accurate. For
-   example, LSP quantizes all absolute values, but the book encodes
-   distance between values because each successive value is larger
-   than the preceeding value.  Thus the desired quantibits apply to
-   the encoded (delta) values, not abs positions. This requires minor
-   additional encode-side trickery. */
-
-void vqgen_quantize(vqgen *v,quant_meta *q){
-
-  float maxdel;
-  float mindel;
-
-  float delta;
-  float maxquant=((1<<q->quant)-1);
-
-  int j,k;
-
-  mindel=maxdel=_now(v,0)[0];
-
-  for(j=0;j<v->entries;j++){
-    float last=0.f;
-    for(k=0;k<v->elements;k++){
-      if(mindel>_now(v,j)[k]-last)mindel=_now(v,j)[k]-last;
-      if(maxdel<_now(v,j)[k]-last)maxdel=_now(v,j)[k]-last;
-      if(q->sequencep)last=_now(v,j)[k];
-    }
-  }
-
-
-  /* first find the basic delta amount from the maximum span to be
-     encoded.  Loosen the delta slightly to allow for additional error
-     during sequence quantization */
-
-  delta=(maxdel-mindel)/((1<<q->quant)-1.5f);
-
-  q->min=_float32_pack(mindel);
-  q->delta=_float32_pack(delta);
-
-  mindel=_float32_unpack(q->min);
-  delta=_float32_unpack(q->delta);
-
-  for(j=0;j<v->entries;j++){
-    float last=0;
-    for(k=0;k<v->elements;k++){
-      float val=_now(v,j)[k];
-      float now=rint((val-last-mindel)/delta);
-
-      _now(v,j)[k]=now;
-      if(now<0){
-        /* be paranoid; this should be impossible */
-        fprintf(stderr,"fault; quantized value<0\n");
-        exit(1);
-      }
-
-      if(now>maxquant){
-        /* be paranoid; this should be impossible */
-        fprintf(stderr,"fault; quantized value>max\n");
-        exit(1);
-      }
-      if(q->sequencep)last=(now*delta)+mindel+last;
-    }
-  }
-}
-
-/* much easier :-).  Unlike in the codebook, we don't un-log log
-   scales; we just make sure they're properly offset. */
-void vqgen_unquantize(vqgen *v,quant_meta *q){
-  long j,k;
-  float mindel=_float32_unpack(q->min);
-  float delta=_float32_unpack(q->delta);
-
-  for(j=0;j<v->entries;j++){
-    float last=0.f;
-    for(k=0;k<v->elements;k++){
-      float now=_now(v,j)[k];
-      now=fabs(now)*delta+last+mindel;
-      if(q->sequencep)last=now;
-      _now(v,j)[k]=now;
-    }
-  }
-}
-
-void vqgen_init(vqgen *v,int elements,int aux,int entries,float mindist,
-                float  (*metric)(vqgen *,float *, float *),
-                float *(*weight)(vqgen *,float *),int centroid){
-  memset(v,0,sizeof(vqgen));
-
-  v->centroid=centroid;
-  v->elements=elements;
-  v->aux=aux;
-  v->mindist=mindist;
-  v->allocated=32768;
-  v->pointlist=_ogg_malloc(v->allocated*(v->elements+v->aux)*sizeof(float));
-
-  v->entries=entries;
-  v->entrylist=_ogg_malloc(v->entries*v->elements*sizeof(float));
-  v->assigned=_ogg_malloc(v->entries*sizeof(long));
-  v->bias=_ogg_calloc(v->entries,sizeof(float));
-  v->max=_ogg_calloc(v->entries,sizeof(float));
-  if(metric)
-    v->metric_func=metric;
-  else
-    v->metric_func=_dist;
-  if(weight)
-    v->weight_func=weight;
-  else
-    v->weight_func=_weight_null;
-
-  v->asciipoints=tmpfile();
-
-}
-
-void vqgen_addpoint(vqgen *v, float *p,float *a){
-  int k;
-  for(k=0;k<v->elements;k++)
-    fprintf(v->asciipoints,"%.12g\n",p[k]);
-  for(k=0;k<v->aux;k++)
-    fprintf(v->asciipoints,"%.12g\n",a[k]);
-
-  if(v->points>=v->allocated){
-    v->allocated*=2;
-    v->pointlist=_ogg_realloc(v->pointlist,v->allocated*(v->elements+v->aux)*
-                         sizeof(float));
-  }
-
-  memcpy(_point(v,v->points),p,sizeof(float)*v->elements);
-  if(v->aux)memcpy(_point(v,v->points)+v->elements,a,sizeof(float)*v->aux);
-
-  /* quantize to the density mesh if it's selected */
-  if(v->mindist>0.f){
-    /* quantize to the mesh */
-    for(k=0;k<v->elements+v->aux;k++)
-      _point(v,v->points)[k]=
-        rint(_point(v,v->points)[k]/v->mindist)*v->mindist;
-  }
-  v->points++;
-  if(!(v->points&0xff))spinnit("loading... ",v->points);
-}
-
-/* yes, not threadsafe.  These utils aren't */
-static int sortit=0;
-static int sortsize=0;
-static int meshcomp(const void *a,const void *b){
-  if(((sortit++)&0xfff)==0)spinnit("sorting mesh...",sortit);
-  return(memcmp(a,b,sortsize));
-}
-
-void vqgen_sortmesh(vqgen *v){
-  sortit=0;
-  if(v->mindist>0.f){
-    long i,march=1;
-
-    /* sort to make uniqueness detection trivial */
-    sortsize=(v->elements+v->aux)*sizeof(float);
-    qsort(v->pointlist,v->points,sortsize,meshcomp);
-
-    /* now march through and eliminate dupes */
-    for(i=1;i<v->points;i++){
-      if(memcmp(_point(v,i),_point(v,i-1),sortsize)){
-        /* a new, unique entry.  march it down */
-        if(i>march)memcpy(_point(v,march),_point(v,i),sortsize);
-        march++;
-      }
-      spinnit("eliminating density... ",v->points-i);
-    }
-
-    /* we're done */
-    fprintf(stderr,"\r%ld training points remining out of %ld"
-            " after density mesh (%ld%%)\n",march,v->points,march*100/v->points);
-    v->points=march;
-
-  }
-  v->sorted=1;
-}
-
-float vqgen_iterate(vqgen *v,int biasp){
-  long   i,j,k;
-
-  float fdesired;
-  long  desired;
-  long  desired2;
-
-  float asserror=0.f;
-  float meterror=0.f;
-  float *new;
-  float *new2;
-  long   *nearcount;
-  float *nearbias;
- #ifdef NOISY
-   char buff[80];
-   FILE *assig;
-   FILE *bias;
-   FILE *cells;
-   sprintf(buff,"cells%d.m",v->it);
-   cells=fopen(buff,"w");
-   sprintf(buff,"assig%d.m",v->it);
-   assig=fopen(buff,"w");
-   sprintf(buff,"bias%d.m",v->it);
-   bias=fopen(buff,"w");
- #endif
-
-
-  if(v->entries<2){
-    fprintf(stderr,"generation requires at least two entries\n");
-    exit(1);
-  }
-
-  if(!v->sorted)vqgen_sortmesh(v);
-  if(!v->seeded)_vqgen_seed(v);
-
-  fdesired=(float)v->points/v->entries;
-  desired=fdesired;
-  desired2=desired*2;
-  new=_ogg_malloc(sizeof(float)*v->entries*v->elements);
-  new2=_ogg_malloc(sizeof(float)*v->entries*v->elements);
-  nearcount=_ogg_malloc(v->entries*sizeof(long));
-  nearbias=_ogg_malloc(v->entries*desired2*sizeof(float));
-
-  /* fill in nearest points for entry biasing */
-  /*memset(v->bias,0,sizeof(float)*v->entries);*/
-  memset(nearcount,0,sizeof(long)*v->entries);
-  memset(v->assigned,0,sizeof(long)*v->entries);
-  if(biasp){
-    for(i=0;i<v->points;i++){
-      float *ppt=v->weight_func(v,_point(v,i));
-      float firstmetric=v->metric_func(v,_now(v,0),ppt)+v->bias[0];
-      float secondmetric=v->metric_func(v,_now(v,1),ppt)+v->bias[1];
-      long   firstentry=0;
-      long   secondentry=1;
-
-      if(!(i&0xff))spinnit("biasing... ",v->points+v->points+v->entries-i);
-
-      if(firstmetric>secondmetric){
-        float temp=firstmetric;
-        firstmetric=secondmetric;
-        secondmetric=temp;
-        firstentry=1;
-        secondentry=0;
-      }
-
-      for(j=2;j<v->entries;j++){
-        float thismetric=v->metric_func(v,_now(v,j),ppt)+v->bias[j];
-        if(thismetric<secondmetric){
-          if(thismetric<firstmetric){
-            secondmetric=firstmetric;
-            secondentry=firstentry;
-            firstmetric=thismetric;
-            firstentry=j;
-          }else{
-            secondmetric=thismetric;
-            secondentry=j;
-          }
-        }
-      }
-
-      j=firstentry;
-      for(j=0;j<v->entries;j++){
-
-        float thismetric,localmetric;
-        float *nearbiasptr=nearbias+desired2*j;
-        long k=nearcount[j];
-
-        localmetric=v->metric_func(v,_now(v,j),ppt);
-        /* 'thismetric' is to be the bias value necessary in the current
-           arrangement for entry j to capture point i */
-        if(firstentry==j){
-          /* use the secondary entry as the threshhold */
-          thismetric=secondmetric-localmetric;
-        }else{
-          /* use the primary entry as the threshhold */
-          thismetric=firstmetric-localmetric;
-        }
-
-        /* support the idea of 'minimum distance'... if we want the
-           cells in a codebook to be roughly some minimum size (as with
-           the low resolution residue books) */
-
-        /* a cute two-stage delayed sorting hack */
-        if(k<desired){
-          nearbiasptr[k]=thismetric;
-          k++;
-          if(k==desired){
-            spinnit("biasing... ",v->points+v->points+v->entries-i);
-            qsort(nearbiasptr,desired,sizeof(float),directdsort);
-          }
-
-        }else if(thismetric>nearbiasptr[desired-1]){
-          nearbiasptr[k]=thismetric;
-          k++;
-          if(k==desired2){
-            spinnit("biasing... ",v->points+v->points+v->entries-i);
-            qsort(nearbiasptr,desired2,sizeof(float),directdsort);
-            k=desired;
-          }
-        }
-        nearcount[j]=k;
-      }
-    }
-
-    /* inflate/deflate */
-
-    for(i=0;i<v->entries;i++){
-      float *nearbiasptr=nearbias+desired2*i;
-
-      spinnit("biasing... ",v->points+v->entries-i);
-
-      /* due to the delayed sorting, we likely need to finish it off....*/
-      if(nearcount[i]>desired)
-        qsort(nearbiasptr,nearcount[i],sizeof(float),directdsort);
-
-      v->bias[i]=nearbiasptr[desired-1];
-
-    }
-  }else{
-    memset(v->bias,0,v->entries*sizeof(float));
-  }
-
-  /* Now assign with new bias and find new midpoints */
-  for(i=0;i<v->points;i++){
-    float *ppt=v->weight_func(v,_point(v,i));
-    float firstmetric=v->metric_func(v,_now(v,0),ppt)+v->bias[0];
-    long   firstentry=0;
-
-    if(!(i&0xff))spinnit("centering... ",v->points-i);
-
-    for(j=0;j<v->entries;j++){
-      float thismetric=v->metric_func(v,_now(v,j),ppt)+v->bias[j];
-      if(thismetric<firstmetric){
-        firstmetric=thismetric;
-        firstentry=j;
-      }
-    }
-
-    j=firstentry;
-
-#ifdef NOISY
-    fprintf(cells,"%g %g\n%g %g\n\n",
-          _now(v,j)[0],_now(v,j)[1],
-          ppt[0],ppt[1]);
-#endif
-
-    firstmetric-=v->bias[j];
-    meterror+=firstmetric;
-
-    if(v->centroid==0){
-      /* set up midpoints for next iter */
-      if(v->assigned[j]++){
-        for(k=0;k<v->elements;k++)
-          vN(new,j)[k]+=ppt[k];
-        if(firstmetric>v->max[j])v->max[j]=firstmetric;
-      }else{
-        for(k=0;k<v->elements;k++)
-          vN(new,j)[k]=ppt[k];
-        v->max[j]=firstmetric;
-      }
-    }else{
-      /* centroid */
-      if(v->assigned[j]++){
-        for(k=0;k<v->elements;k++){
-          if(vN(new,j)[k]>ppt[k])vN(new,j)[k]=ppt[k];
-          if(vN(new2,j)[k]<ppt[k])vN(new2,j)[k]=ppt[k];
-        }
-        if(firstmetric>v->max[firstentry])v->max[j]=firstmetric;
-      }else{
-        for(k=0;k<v->elements;k++){
-          vN(new,j)[k]=ppt[k];
-          vN(new2,j)[k]=ppt[k];
-        }
-        v->max[firstentry]=firstmetric;
-      }
-    }
-  }
-
-  /* assign midpoints */
-
-  for(j=0;j<v->entries;j++){
-#ifdef NOISY
-    fprintf(assig,"%ld\n",v->assigned[j]);
-    fprintf(bias,"%g\n",v->bias[j]);
-#endif
-    asserror+=fabs(v->assigned[j]-fdesired);
-    if(v->assigned[j]){
-      if(v->centroid==0){
-        for(k=0;k<v->elements;k++)
-          _now(v,j)[k]=vN(new,j)[k]/v->assigned[j];
-      }else{
-        for(k=0;k<v->elements;k++)
-          _now(v,j)[k]=(vN(new,j)[k]+vN(new2,j)[k])/2.f;
-      }
-    }
-  }
-
-  asserror/=(v->entries*fdesired);
-
-  fprintf(stderr,"Pass #%d... ",v->it);
-  fprintf(stderr,": dist %g(%g) metric error=%g \n",
-          asserror,fdesired,meterror/v->points);
-  v->it++;
-
-  free(new);
-  free(nearcount);
-  free(nearbias);
-#ifdef NOISY
-  fclose(assig);
-  fclose(bias);
-  fclose(cells);
-#endif
-  return(asserror);
-}
-
-- 
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