michael@0: /********************************************************************
michael@0:  *                                                                  *
michael@0:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
michael@0:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
michael@0:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
michael@0:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
michael@0:  *                                                                  *
michael@0:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
michael@0:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
michael@0:  *                                                                  *
michael@0:  ********************************************************************
michael@0: 
michael@0:  function: basic shared codebook operations
michael@0:  last mod: $Id: sharedbook.c 19057 2014-01-22 12:32:31Z xiphmont $
michael@0: 
michael@0:  ********************************************************************/
michael@0: 
michael@0: #include <stdlib.h>
michael@0: #include <math.h>
michael@0: #include <string.h>
michael@0: #include <ogg/ogg.h>
michael@0: #include "os.h"
michael@0: #include "misc.h"
michael@0: #include "vorbis/codec.h"
michael@0: #include "codebook.h"
michael@0: #include "scales.h"
michael@0: 
michael@0: /**** pack/unpack helpers ******************************************/
michael@0: int _ilog(unsigned int v){
michael@0:   int ret=0;
michael@0:   while(v){
michael@0:     ret++;
michael@0:     v>>=1;
michael@0:   }
michael@0:   return(ret);
michael@0: }
michael@0: 
michael@0: /* 32 bit float (not IEEE; nonnormalized mantissa +
michael@0:    biased exponent) : neeeeeee eeemmmmm mmmmmmmm mmmmmmmm
michael@0:    Why not IEEE?  It's just not that important here. */
michael@0: 
michael@0: #define VQ_FEXP 10
michael@0: #define VQ_FMAN 21
michael@0: #define VQ_FEXP_BIAS 768 /* bias toward values smaller than 1. */
michael@0: 
michael@0: /* doesn't currently guard under/overflow */
michael@0: long _float32_pack(float val){
michael@0:   int sign=0;
michael@0:   long exp;
michael@0:   long mant;
michael@0:   if(val<0){
michael@0:     sign=0x80000000;
michael@0:     val= -val;
michael@0:   }
michael@0:   exp= floor(log(val)/log(2.f)+.001); //+epsilon
michael@0:   mant=rint(ldexp(val,(VQ_FMAN-1)-exp));
michael@0:   exp=(exp+VQ_FEXP_BIAS)<<VQ_FMAN;
michael@0: 
michael@0:   return(sign|exp|mant);
michael@0: }
michael@0: 
michael@0: float _float32_unpack(long val){
michael@0:   double mant=val&0x1fffff;
michael@0:   int    sign=val&0x80000000;
michael@0:   long   exp =(val&0x7fe00000L)>>VQ_FMAN;
michael@0:   if(sign)mant= -mant;
michael@0:   return(ldexp(mant,exp-(VQ_FMAN-1)-VQ_FEXP_BIAS));
michael@0: }
michael@0: 
michael@0: /* given a list of word lengths, generate a list of codewords.  Works
michael@0:    for length ordered or unordered, always assigns the lowest valued
michael@0:    codewords first.  Extended to handle unused entries (length 0) */
michael@0: ogg_uint32_t *_make_words(char *l,long n,long sparsecount){
michael@0:   long i,j,count=0;
michael@0:   ogg_uint32_t marker[33];
michael@0:   ogg_uint32_t *r=_ogg_malloc((sparsecount?sparsecount:n)*sizeof(*r));
michael@0:   memset(marker,0,sizeof(marker));
michael@0: 
michael@0:   for(i=0;i<n;i++){
michael@0:     long length=l[i];
michael@0:     if(length>0){
michael@0:       ogg_uint32_t entry=marker[length];
michael@0: 
michael@0:       /* when we claim a node for an entry, we also claim the nodes
michael@0:          below it (pruning off the imagined tree that may have dangled
michael@0:          from it) as well as blocking the use of any nodes directly
michael@0:          above for leaves */
michael@0: 
michael@0:       /* update ourself */
michael@0:       if(length<32 && (entry>>length)){
michael@0:         /* error condition; the lengths must specify an overpopulated tree */
michael@0:         _ogg_free(r);
michael@0:         return(NULL);
michael@0:       }
michael@0:       r[count++]=entry;
michael@0: 
michael@0:       /* Look to see if the next shorter marker points to the node
michael@0:          above. if so, update it and repeat.  */
michael@0:       {
michael@0:         for(j=length;j>0;j--){
michael@0: 
michael@0:           if(marker[j]&1){
michael@0:             /* have to jump branches */
michael@0:             if(j==1)
michael@0:               marker[1]++;
michael@0:             else
michael@0:               marker[j]=marker[j-1]<<1;
michael@0:             break; /* invariant says next upper marker would already
michael@0:                       have been moved if it was on the same path */
michael@0:           }
michael@0:           marker[j]++;
michael@0:         }
michael@0:       }
michael@0: 
michael@0:       /* prune the tree; the implicit invariant says all the longer
michael@0:          markers were dangling from our just-taken node.  Dangle them
michael@0:          from our *new* node. */
michael@0:       for(j=length+1;j<33;j++)
michael@0:         if((marker[j]>>1) == entry){
michael@0:           entry=marker[j];
michael@0:           marker[j]=marker[j-1]<<1;
michael@0:         }else
michael@0:           break;
michael@0:     }else
michael@0:       if(sparsecount==0)count++;
michael@0:   }
michael@0: 
michael@0:   /* sanity check the huffman tree; an underpopulated tree must be
michael@0:      rejected. The only exception is the one-node pseudo-nil tree,
michael@0:      which appears to be underpopulated because the tree doesn't
michael@0:      really exist; there's only one possible 'codeword' or zero bits,
michael@0:      but the above tree-gen code doesn't mark that. */
michael@0:   if(sparsecount != 1){
michael@0:     for(i=1;i<33;i++)
michael@0:       if(marker[i] & (0xffffffffUL>>(32-i))){
michael@0: 	_ogg_free(r);
michael@0: 	return(NULL);
michael@0:       }
michael@0:   }
michael@0: 
michael@0:   /* bitreverse the words because our bitwise packer/unpacker is LSb
michael@0:      endian */
michael@0:   for(i=0,count=0;i<n;i++){
michael@0:     ogg_uint32_t temp=0;
michael@0:     for(j=0;j<l[i];j++){
michael@0:       temp<<=1;
michael@0:       temp|=(r[count]>>j)&1;
michael@0:     }
michael@0: 
michael@0:     if(sparsecount){
michael@0:       if(l[i])
michael@0:         r[count++]=temp;
michael@0:     }else
michael@0:       r[count++]=temp;
michael@0:   }
michael@0: 
michael@0:   return(r);
michael@0: }
michael@0: 
michael@0: /* there might be a straightforward one-line way to do the below
michael@0:    that's portable and totally safe against roundoff, but I haven't
michael@0:    thought of it.  Therefore, we opt on the side of caution */
michael@0: long _book_maptype1_quantvals(const static_codebook *b){
michael@0:   long vals=floor(pow((float)b->entries,1.f/b->dim));
michael@0: 
michael@0:   /* the above *should* be reliable, but we'll not assume that FP is
michael@0:      ever reliable when bitstream sync is at stake; verify via integer
michael@0:      means that vals really is the greatest value of dim for which
michael@0:      vals^b->bim <= b->entries */
michael@0:   /* treat the above as an initial guess */
michael@0:   while(1){
michael@0:     long acc=1;
michael@0:     long acc1=1;
michael@0:     int i;
michael@0:     for(i=0;i<b->dim;i++){
michael@0:       acc*=vals;
michael@0:       acc1*=vals+1;
michael@0:     }
michael@0:     if(acc<=b->entries && acc1>b->entries){
michael@0:       return(vals);
michael@0:     }else{
michael@0:       if(acc>b->entries){
michael@0:         vals--;
michael@0:       }else{
michael@0:         vals++;
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: /* unpack the quantized list of values for encode/decode ***********/
michael@0: /* we need to deal with two map types: in map type 1, the values are
michael@0:    generated algorithmically (each column of the vector counts through
michael@0:    the values in the quant vector). in map type 2, all the values came
michael@0:    in in an explicit list.  Both value lists must be unpacked */
michael@0: float *_book_unquantize(const static_codebook *b,int n,int *sparsemap){
michael@0:   long j,k,count=0;
michael@0:   if(b->maptype==1 || b->maptype==2){
michael@0:     int quantvals;
michael@0:     float mindel=_float32_unpack(b->q_min);
michael@0:     float delta=_float32_unpack(b->q_delta);
michael@0:     float *r=_ogg_calloc(n*b->dim,sizeof(*r));
michael@0: 
michael@0:     /* maptype 1 and 2 both use a quantized value vector, but
michael@0:        different sizes */
michael@0:     switch(b->maptype){
michael@0:     case 1:
michael@0:       /* most of the time, entries%dimensions == 0, but we need to be
michael@0:          well defined.  We define that the possible vales at each
michael@0:          scalar is values == entries/dim.  If entries%dim != 0, we'll
michael@0:          have 'too few' values (values*dim<entries), which means that
michael@0:          we'll have 'left over' entries; left over entries use zeroed
michael@0:          values (and are wasted).  So don't generate codebooks like
michael@0:          that */
michael@0:       quantvals=_book_maptype1_quantvals(b);
michael@0:       for(j=0;j<b->entries;j++){
michael@0:         if((sparsemap && b->lengthlist[j]) || !sparsemap){
michael@0:           float last=0.f;
michael@0:           int indexdiv=1;
michael@0:           for(k=0;k<b->dim;k++){
michael@0:             int index= (j/indexdiv)%quantvals;
michael@0:             float val=b->quantlist[index];
michael@0:             val=fabs(val)*delta+mindel+last;
michael@0:             if(b->q_sequencep)last=val;
michael@0:             if(sparsemap)
michael@0:               r[sparsemap[count]*b->dim+k]=val;
michael@0:             else
michael@0:               r[count*b->dim+k]=val;
michael@0:             indexdiv*=quantvals;
michael@0:           }
michael@0:           count++;
michael@0:         }
michael@0: 
michael@0:       }
michael@0:       break;
michael@0:     case 2:
michael@0:       for(j=0;j<b->entries;j++){
michael@0:         if((sparsemap && b->lengthlist[j]) || !sparsemap){
michael@0:           float last=0.f;
michael@0: 
michael@0:           for(k=0;k<b->dim;k++){
michael@0:             float val=b->quantlist[j*b->dim+k];
michael@0:             val=fabs(val)*delta+mindel+last;
michael@0:             if(b->q_sequencep)last=val;
michael@0:             if(sparsemap)
michael@0:               r[sparsemap[count]*b->dim+k]=val;
michael@0:             else
michael@0:               r[count*b->dim+k]=val;
michael@0:           }
michael@0:           count++;
michael@0:         }
michael@0:       }
michael@0:       break;
michael@0:     }
michael@0: 
michael@0:     return(r);
michael@0:   }
michael@0:   return(NULL);
michael@0: }
michael@0: 
michael@0: void vorbis_staticbook_destroy(static_codebook *b){
michael@0:   if(b->allocedp){
michael@0:     if(b->quantlist)_ogg_free(b->quantlist);
michael@0:     if(b->lengthlist)_ogg_free(b->lengthlist);
michael@0:     memset(b,0,sizeof(*b));
michael@0:     _ogg_free(b);
michael@0:   } /* otherwise, it is in static memory */
michael@0: }
michael@0: 
michael@0: void vorbis_book_clear(codebook *b){
michael@0:   /* static book is not cleared; we're likely called on the lookup and
michael@0:      the static codebook belongs to the info struct */
michael@0:   if(b->valuelist)_ogg_free(b->valuelist);
michael@0:   if(b->codelist)_ogg_free(b->codelist);
michael@0: 
michael@0:   if(b->dec_index)_ogg_free(b->dec_index);
michael@0:   if(b->dec_codelengths)_ogg_free(b->dec_codelengths);
michael@0:   if(b->dec_firsttable)_ogg_free(b->dec_firsttable);
michael@0: 
michael@0:   memset(b,0,sizeof(*b));
michael@0: }
michael@0: 
michael@0: int vorbis_book_init_encode(codebook *c,const static_codebook *s){
michael@0: 
michael@0:   memset(c,0,sizeof(*c));
michael@0:   c->c=s;
michael@0:   c->entries=s->entries;
michael@0:   c->used_entries=s->entries;
michael@0:   c->dim=s->dim;
michael@0:   c->codelist=_make_words(s->lengthlist,s->entries,0);
michael@0:   //c->valuelist=_book_unquantize(s,s->entries,NULL);
michael@0:   c->quantvals=_book_maptype1_quantvals(s);
michael@0:   c->minval=(int)rint(_float32_unpack(s->q_min));
michael@0:   c->delta=(int)rint(_float32_unpack(s->q_delta));
michael@0: 
michael@0:   return(0);
michael@0: }
michael@0: 
michael@0: static ogg_uint32_t bitreverse(ogg_uint32_t x){
michael@0:   x=    ((x>>16)&0x0000ffffUL) | ((x<<16)&0xffff0000UL);
michael@0:   x=    ((x>> 8)&0x00ff00ffUL) | ((x<< 8)&0xff00ff00UL);
michael@0:   x=    ((x>> 4)&0x0f0f0f0fUL) | ((x<< 4)&0xf0f0f0f0UL);
michael@0:   x=    ((x>> 2)&0x33333333UL) | ((x<< 2)&0xccccccccUL);
michael@0:   return((x>> 1)&0x55555555UL) | ((x<< 1)&0xaaaaaaaaUL);
michael@0: }
michael@0: 
michael@0: static int sort32a(const void *a,const void *b){
michael@0:   return ( **(ogg_uint32_t **)a>**(ogg_uint32_t **)b)-
michael@0:     ( **(ogg_uint32_t **)a<**(ogg_uint32_t **)b);
michael@0: }
michael@0: 
michael@0: /* decode codebook arrangement is more heavily optimized than encode */
michael@0: int vorbis_book_init_decode(codebook *c,const static_codebook *s){
michael@0:   int i,j,n=0,tabn;
michael@0:   int *sortindex;
michael@0:   memset(c,0,sizeof(*c));
michael@0: 
michael@0:   /* count actually used entries */
michael@0:   for(i=0;i<s->entries;i++)
michael@0:     if(s->lengthlist[i]>0)
michael@0:       n++;
michael@0: 
michael@0:   c->entries=s->entries;
michael@0:   c->used_entries=n;
michael@0:   c->dim=s->dim;
michael@0: 
michael@0:   if(n>0){
michael@0: 
michael@0:     /* two different remappings go on here.
michael@0: 
michael@0:     First, we collapse the likely sparse codebook down only to
michael@0:     actually represented values/words.  This collapsing needs to be
michael@0:     indexed as map-valueless books are used to encode original entry
michael@0:     positions as integers.
michael@0: 
michael@0:     Second, we reorder all vectors, including the entry index above,
michael@0:     by sorted bitreversed codeword to allow treeless decode. */
michael@0: 
michael@0:     /* perform sort */
michael@0:     ogg_uint32_t *codes=_make_words(s->lengthlist,s->entries,c->used_entries);
michael@0:     ogg_uint32_t **codep=alloca(sizeof(*codep)*n);
michael@0: 
michael@0:     if(codes==NULL)goto err_out;
michael@0: 
michael@0:     for(i=0;i<n;i++){
michael@0:       codes[i]=bitreverse(codes[i]);
michael@0:       codep[i]=codes+i;
michael@0:     }
michael@0: 
michael@0:     qsort(codep,n,sizeof(*codep),sort32a);
michael@0: 
michael@0:     sortindex=alloca(n*sizeof(*sortindex));
michael@0:     c->codelist=_ogg_malloc(n*sizeof(*c->codelist));
michael@0:     /* the index is a reverse index */
michael@0:     for(i=0;i<n;i++){
michael@0:       int position=codep[i]-codes;
michael@0:       sortindex[position]=i;
michael@0:     }
michael@0: 
michael@0:     for(i=0;i<n;i++)
michael@0:       c->codelist[sortindex[i]]=codes[i];
michael@0:     _ogg_free(codes);
michael@0: 
michael@0: 
michael@0:     c->valuelist=_book_unquantize(s,n,sortindex);
michael@0:     c->dec_index=_ogg_malloc(n*sizeof(*c->dec_index));
michael@0: 
michael@0:     for(n=0,i=0;i<s->entries;i++)
michael@0:       if(s->lengthlist[i]>0)
michael@0:         c->dec_index[sortindex[n++]]=i;
michael@0: 
michael@0:     c->dec_codelengths=_ogg_malloc(n*sizeof(*c->dec_codelengths));
michael@0:     for(n=0,i=0;i<s->entries;i++)
michael@0:       if(s->lengthlist[i]>0)
michael@0:         c->dec_codelengths[sortindex[n++]]=s->lengthlist[i];
michael@0: 
michael@0:     c->dec_firsttablen=_ilog(c->used_entries)-4; /* this is magic */
michael@0:     if(c->dec_firsttablen<5)c->dec_firsttablen=5;
michael@0:     if(c->dec_firsttablen>8)c->dec_firsttablen=8;
michael@0: 
michael@0:     tabn=1<<c->dec_firsttablen;
michael@0:     c->dec_firsttable=_ogg_calloc(tabn,sizeof(*c->dec_firsttable));
michael@0:     c->dec_maxlength=0;
michael@0: 
michael@0:     for(i=0;i<n;i++){
michael@0:       if(c->dec_maxlength<c->dec_codelengths[i])
michael@0:         c->dec_maxlength=c->dec_codelengths[i];
michael@0:       if(c->dec_codelengths[i]<=c->dec_firsttablen){
michael@0:         ogg_uint32_t orig=bitreverse(c->codelist[i]);
michael@0:         for(j=0;j<(1<<(c->dec_firsttablen-c->dec_codelengths[i]));j++)
michael@0:           c->dec_firsttable[orig|(j<<c->dec_codelengths[i])]=i+1;
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     /* now fill in 'unused' entries in the firsttable with hi/lo search
michael@0:        hints for the non-direct-hits */
michael@0:     {
michael@0:       ogg_uint32_t mask=0xfffffffeUL<<(31-c->dec_firsttablen);
michael@0:       long lo=0,hi=0;
michael@0: 
michael@0:       for(i=0;i<tabn;i++){
michael@0:         ogg_uint32_t word=i<<(32-c->dec_firsttablen);
michael@0:         if(c->dec_firsttable[bitreverse(word)]==0){
michael@0:           while((lo+1)<n && c->codelist[lo+1]<=word)lo++;
michael@0:           while(    hi<n && word>=(c->codelist[hi]&mask))hi++;
michael@0: 
michael@0:           /* we only actually have 15 bits per hint to play with here.
michael@0:              In order to overflow gracefully (nothing breaks, efficiency
michael@0:              just drops), encode as the difference from the extremes. */
michael@0:           {
michael@0:             unsigned long loval=lo;
michael@0:             unsigned long hival=n-hi;
michael@0: 
michael@0:             if(loval>0x7fff)loval=0x7fff;
michael@0:             if(hival>0x7fff)hival=0x7fff;
michael@0:             c->dec_firsttable[bitreverse(word)]=
michael@0:               0x80000000UL | (loval<<15) | hival;
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   return(0);
michael@0:  err_out:
michael@0:   vorbis_book_clear(c);
michael@0:   return(-1);
michael@0: }
michael@0: 
michael@0: long vorbis_book_codeword(codebook *book,int entry){
michael@0:   if(book->c) /* only use with encode; decode optimizations are
michael@0:                  allowed to break this */
michael@0:     return book->codelist[entry];
michael@0:   return -1;
michael@0: }
michael@0: 
michael@0: long vorbis_book_codelen(codebook *book,int entry){
michael@0:   if(book->c) /* only use with encode; decode optimizations are
michael@0:                  allowed to break this */
michael@0:     return book->c->lengthlist[entry];
michael@0:   return -1;
michael@0: }
michael@0: 
michael@0: #ifdef _V_SELFTEST
michael@0: 
michael@0: /* Unit tests of the dequantizer; this stuff will be OK
michael@0:    cross-platform, I simply want to be sure that special mapping cases
michael@0:    actually work properly; a bug could go unnoticed for a while */
michael@0: 
michael@0: #include <stdio.h>
michael@0: 
michael@0: /* cases:
michael@0: 
michael@0:    no mapping
michael@0:    full, explicit mapping
michael@0:    algorithmic mapping
michael@0: 
michael@0:    nonsequential
michael@0:    sequential
michael@0: */
michael@0: 
michael@0: static long full_quantlist1[]={0,1,2,3,    4,5,6,7, 8,3,6,1};
michael@0: static long partial_quantlist1[]={0,7,2};
michael@0: 
michael@0: /* no mapping */
michael@0: static_codebook test1={
michael@0:   4,16,
michael@0:   NULL,
michael@0:   0,
michael@0:   0,0,0,0,
michael@0:   NULL,
michael@0:   0
michael@0: };
michael@0: static float *test1_result=NULL;
michael@0: 
michael@0: /* linear, full mapping, nonsequential */
michael@0: static_codebook test2={
michael@0:   4,3,
michael@0:   NULL,
michael@0:   2,
michael@0:   -533200896,1611661312,4,0,
michael@0:   full_quantlist1,
michael@0:   0
michael@0: };
michael@0: static float test2_result[]={-3,-2,-1,0, 1,2,3,4, 5,0,3,-2};
michael@0: 
michael@0: /* linear, full mapping, sequential */
michael@0: static_codebook test3={
michael@0:   4,3,
michael@0:   NULL,
michael@0:   2,
michael@0:   -533200896,1611661312,4,1,
michael@0:   full_quantlist1,
michael@0:   0
michael@0: };
michael@0: static float test3_result[]={-3,-5,-6,-6, 1,3,6,10, 5,5,8,6};
michael@0: 
michael@0: /* linear, algorithmic mapping, nonsequential */
michael@0: static_codebook test4={
michael@0:   3,27,
michael@0:   NULL,
michael@0:   1,
michael@0:   -533200896,1611661312,4,0,
michael@0:   partial_quantlist1,
michael@0:   0
michael@0: };
michael@0: static float test4_result[]={-3,-3,-3, 4,-3,-3, -1,-3,-3,
michael@0:                               -3, 4,-3, 4, 4,-3, -1, 4,-3,
michael@0:                               -3,-1,-3, 4,-1,-3, -1,-1,-3,
michael@0:                               -3,-3, 4, 4,-3, 4, -1,-3, 4,
michael@0:                               -3, 4, 4, 4, 4, 4, -1, 4, 4,
michael@0:                               -3,-1, 4, 4,-1, 4, -1,-1, 4,
michael@0:                               -3,-3,-1, 4,-3,-1, -1,-3,-1,
michael@0:                               -3, 4,-1, 4, 4,-1, -1, 4,-1,
michael@0:                               -3,-1,-1, 4,-1,-1, -1,-1,-1};
michael@0: 
michael@0: /* linear, algorithmic mapping, sequential */
michael@0: static_codebook test5={
michael@0:   3,27,
michael@0:   NULL,
michael@0:   1,
michael@0:   -533200896,1611661312,4,1,
michael@0:   partial_quantlist1,
michael@0:   0
michael@0: };
michael@0: static float test5_result[]={-3,-6,-9, 4, 1,-2, -1,-4,-7,
michael@0:                               -3, 1,-2, 4, 8, 5, -1, 3, 0,
michael@0:                               -3,-4,-7, 4, 3, 0, -1,-2,-5,
michael@0:                               -3,-6,-2, 4, 1, 5, -1,-4, 0,
michael@0:                               -3, 1, 5, 4, 8,12, -1, 3, 7,
michael@0:                               -3,-4, 0, 4, 3, 7, -1,-2, 2,
michael@0:                               -3,-6,-7, 4, 1, 0, -1,-4,-5,
michael@0:                               -3, 1, 0, 4, 8, 7, -1, 3, 2,
michael@0:                               -3,-4,-5, 4, 3, 2, -1,-2,-3};
michael@0: 
michael@0: void run_test(static_codebook *b,float *comp){
michael@0:   float *out=_book_unquantize(b,b->entries,NULL);
michael@0:   int i;
michael@0: 
michael@0:   if(comp){
michael@0:     if(!out){
michael@0:       fprintf(stderr,"_book_unquantize incorrectly returned NULL\n");
michael@0:       exit(1);
michael@0:     }
michael@0: 
michael@0:     for(i=0;i<b->entries*b->dim;i++)
michael@0:       if(fabs(out[i]-comp[i])>.0001){
michael@0:         fprintf(stderr,"disagreement in unquantized and reference data:\n"
michael@0:                 "position %d, %g != %g\n",i,out[i],comp[i]);
michael@0:         exit(1);
michael@0:       }
michael@0: 
michael@0:   }else{
michael@0:     if(out){
michael@0:       fprintf(stderr,"_book_unquantize returned a value array: \n"
michael@0:               " correct result should have been NULL\n");
michael@0:       exit(1);
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: int main(){
michael@0:   /* run the nine dequant tests, and compare to the hand-rolled results */
michael@0:   fprintf(stderr,"Dequant test 1... ");
michael@0:   run_test(&test1,test1_result);
michael@0:   fprintf(stderr,"OK\nDequant test 2... ");
michael@0:   run_test(&test2,test2_result);
michael@0:   fprintf(stderr,"OK\nDequant test 3... ");
michael@0:   run_test(&test3,test3_result);
michael@0:   fprintf(stderr,"OK\nDequant test 4... ");
michael@0:   run_test(&test4,test4_result);
michael@0:   fprintf(stderr,"OK\nDequant test 5... ");
michael@0:   run_test(&test5,test5_result);
michael@0:   fprintf(stderr,"OK\n\n");
michael@0: 
michael@0:   return(0);
michael@0: }
michael@0: 
michael@0: #endif