* 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 XIPHOPHORUS Company http://www.xiph.org/ *
-
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 *
+ * by the Xiph.Org Foundation http://www.xiph.org/ *
+ * *
********************************************************************
function: basic shared codebook operations
- last mod: $Id: sharedbook.c,v 1.18 2001/10/02 00:14:32 segher Exp $
********************************************************************/
#include <stdlib.h>
+#include <limits.h>
#include <math.h>
#include <string.h>
#include <ogg/ogg.h>
#include "os.h"
+#include "misc.h"
#include "vorbis/codec.h"
#include "codebook.h"
#include "scales.h"
/**** pack/unpack helpers ******************************************/
-int _ilog(unsigned int v){
- int ret=0;
- while(v){
- ret++;
- v>>=1;
- }
- return(ret);
+
+int ov_ilog(ogg_uint32_t v){
+ int ret;
+ for(ret=0;v;ret++)v>>=1;
+ return ret;
}
/* 32 bit float (not IEEE; nonnormalized mantissa +
- biased exponent) : neeeeeee eeemmmmm mmmmmmmm mmmmmmmm
+ biased exponent) : neeeeeee eeemmmmm mmmmmmmm mmmmmmmm
Why not IEEE? It's just not that important here. */
#define VQ_FEXP 10
sign=0x80000000;
val= -val;
}
- exp= floor(log(val)/log(2));
+ exp= floor(log(val)/log(2.f)+.001); /* +epsilon */
mant=rint(ldexp(val,(VQ_FMAN-1)-exp));
exp=(exp+VQ_FEXP_BIAS)<<VQ_FMAN;
int sign=val&0x80000000;
long exp =(val&0x7fe00000L)>>VQ_FMAN;
if(sign)mant= -mant;
- return(ldexp(mant,exp-(VQ_FMAN-1)-VQ_FEXP_BIAS));
+ exp=exp-(VQ_FMAN-1)-VQ_FEXP_BIAS;
+ /* clamp excessive exponent values */
+ if (exp>63){
+ exp=63;
+ }
+ if (exp<-63){
+ exp-63;
+ }
+ return(ldexp(mant,exp));
}
/* given a list of word lengths, generate a list of codewords. Works
for length ordered or unordered, always assigns the lowest valued
codewords first. Extended to handle unused entries (length 0) */
-long *_make_words(long *l,long n){
- long i,j;
- long marker[33];
- long *r=_ogg_malloc(n*sizeof(*r));
+ogg_uint32_t *_make_words(char *l,long n,long sparsecount){
+ long i,j,count=0;
+ ogg_uint32_t marker[33];
+ ogg_uint32_t *r=_ogg_malloc((sparsecount?sparsecount:n)*sizeof(*r));
memset(marker,0,sizeof(marker));
for(i=0;i<n;i++){
long length=l[i];
if(length>0){
- long entry=marker[length];
-
+ ogg_uint32_t entry=marker[length];
+
/* when we claim a node for an entry, we also claim the nodes
- below it (pruning off the imagined tree that may have dangled
- from it) as well as blocking the use of any nodes directly
- above for leaves */
-
+ below it (pruning off the imagined tree that may have dangled
+ from it) as well as blocking the use of any nodes directly
+ above for leaves */
+
/* update ourself */
if(length<32 && (entry>>length)){
- /* error condition; the lengths must specify an overpopulated tree */
- _ogg_free(r);
- return(NULL);
+ /* error condition; the lengths must specify an overpopulated tree */
+ _ogg_free(r);
+ return(NULL);
}
- r[i]=entry;
-
+ r[count++]=entry;
+
/* Look to see if the next shorter marker points to the node
- above. if so, update it and repeat. */
+ above. if so, update it and repeat. */
{
- for(j=length;j>0;j--){
-
- if(marker[j]&1){
- /* have to jump branches */
- if(j==1)
- marker[1]++;
- else
- marker[j]=marker[j-1]<<1;
- break; /* invariant says next upper marker would already
- have been moved if it was on the same path */
- }
- marker[j]++;
- }
+ for(j=length;j>0;j--){
+
+ if(marker[j]&1){
+ /* have to jump branches */
+ if(j==1)
+ marker[1]++;
+ else
+ marker[j]=marker[j-1]<<1;
+ break; /* invariant says next upper marker would already
+ have been moved if it was on the same path */
+ }
+ marker[j]++;
+ }
}
-
+
/* prune the tree; the implicit invariant says all the longer
- markers were dangling from our just-taken node. Dangle them
- from our *new* node. */
+ markers were dangling from our just-taken node. Dangle them
+ from our *new* node. */
for(j=length+1;j<33;j++)
- if((marker[j]>>1) == entry){
- entry=marker[j];
- marker[j]=marker[j-1]<<1;
- }else
- break;
- }
+ if((marker[j]>>1) == entry){
+ entry=marker[j];
+ marker[j]=marker[j-1]<<1;
+ }else
+ break;
+ }else
+ if(sparsecount==0)count++;
}
-
+
+ /* any underpopulated tree must be rejected. */
+ /* Single-entry codebooks are a retconned extension to the spec.
+ They have a single codeword '0' of length 1 that results in an
+ underpopulated tree. Shield that case from the underformed tree check. */
+ if(!(count==1 && marker[2]==2)){
+ for(i=1;i<33;i++)
+ if(marker[i] & (0xffffffffUL>>(32-i))){
+ _ogg_free(r);
+ return(NULL);
+ }
+ }
+
/* bitreverse the words because our bitwise packer/unpacker is LSb
endian */
- for(i=0;i<n;i++){
- long temp=0;
+ for(i=0,count=0;i<n;i++){
+ ogg_uint32_t temp=0;
for(j=0;j<l[i];j++){
temp<<=1;
- temp|=(r[i]>>j)&1;
+ temp|=(r[count]>>j)&1;
}
- r[i]=temp;
- }
- return(r);
-}
-
-/* build the decode helper tree from the codewords */
-decode_aux *_make_decode_tree(codebook *c){
- const static_codebook *s=c->c;
- long top=0,i,j,n;
- decode_aux *t=_ogg_malloc(sizeof(*t));
- long *ptr0=t->ptr0=_ogg_calloc(c->entries*2,sizeof(*ptr0));
- long *ptr1=t->ptr1=_ogg_calloc(c->entries*2,sizeof(*ptr1));
- long *codelist=_make_words(s->lengthlist,s->entries);
-
- if(codelist==NULL)return(NULL);
- t->aux=c->entries*2;
-
- for(i=0;i<c->entries;i++){
- if(s->lengthlist[i]>0){
- long ptr=0;
- for(j=0;j<s->lengthlist[i]-1;j++){
- int bit=(codelist[i]>>j)&1;
- if(!bit){
- if(!ptr0[ptr])
- ptr0[ptr]= ++top;
- ptr=ptr0[ptr];
- }else{
- if(!ptr1[ptr])
- ptr1[ptr]= ++top;
- ptr=ptr1[ptr];
- }
- }
- if(!((codelist[i]>>j)&1))
- ptr0[ptr]=-i;
- else
- ptr1[ptr]=-i;
- }
- }
- _ogg_free(codelist);
-
- t->tabn = _ilog(c->entries)-4; /* this is magic */
- if(t->tabn<5)t->tabn=5;
- n = 1<<t->tabn;
- t->tab = _ogg_malloc(n*sizeof(*t->tab));
- t->tabl = _ogg_malloc(n*sizeof(*t->tabl));
- for (i = 0; i < n; i++) {
- long p = 0;
- for (j = 0; j < t->tabn && (p > 0 || j == 0); j++) {
- if (i & (1 << j))
- p = ptr1[p];
- else
- p = ptr0[p];
- }
- /* now j == length, and p == -code */
- t->tab[i] = p;
- t->tabl[i] = j;
+ if(sparsecount){
+ if(l[i])
+ r[count++]=temp;
+ }else
+ r[count++]=temp;
}
- return(t);
+ return(r);
}
/* there might be a straightforward one-line way to do the below
that's portable and totally safe against roundoff, but I haven't
thought of it. Therefore, we opt on the side of caution */
long _book_maptype1_quantvals(const static_codebook *b){
- long vals=floor(pow(b->entries,1.f/b->dim));
+ long vals;
+ if(b->entries<1){
+ return(0);
+ }
+ vals=floor(pow((float)b->entries,1.f/b->dim));
/* the above *should* be reliable, but we'll not assume that FP is
ever reliable when bitstream sync is at stake; verify via integer
means that vals really is the greatest value of dim for which
vals^b->bim <= b->entries */
/* treat the above as an initial guess */
+ if(vals<1){
+ vals=1;
+ }
while(1){
long acc=1;
long acc1=1;
int i;
for(i=0;i<b->dim;i++){
+ if(b->entries/vals<acc)break;
acc*=vals;
- acc1*=vals+1;
+ if(LONG_MAX/(vals+1)<acc1)acc1=LONG_MAX;
+ else acc1*=vals+1;
}
- if(acc<=b->entries && acc1>b->entries){
+ if(i>=b->dim && acc<=b->entries && acc1>b->entries){
return(vals);
}else{
- if(acc>b->entries){
- vals--;
+ if(i<b->dim || acc>b->entries){
+ vals--;
}else{
- vals++;
+ vals++;
}
}
}
generated algorithmically (each column of the vector counts through
the values in the quant vector). in map type 2, all the values came
in in an explicit list. Both value lists must be unpacked */
-float *_book_unquantize(const static_codebook *b){
- long j,k;
+float *_book_unquantize(const static_codebook *b,int n,int *sparsemap){
+ long j,k,count=0;
if(b->maptype==1 || b->maptype==2){
int quantvals;
float mindel=_float32_unpack(b->q_min);
float delta=_float32_unpack(b->q_delta);
- float *r=_ogg_calloc(b->entries*b->dim,sizeof(*r));
+ float *r=_ogg_calloc(n*b->dim,sizeof(*r));
/* maptype 1 and 2 both use a quantized value vector, but
different sizes */
switch(b->maptype){
case 1:
/* most of the time, entries%dimensions == 0, but we need to be
- well defined. We define that the possible vales at each
- scalar is values == entries/dim. If entries%dim != 0, we'll
- have 'too few' values (values*dim<entries), which means that
- we'll have 'left over' entries; left over entries use zeroed
- values (and are wasted). So don't generate codebooks like
- that */
+ well defined. We define that the possible vales at each
+ scalar is values == entries/dim. If entries%dim != 0, we'll
+ have 'too few' values (values*dim<entries), which means that
+ we'll have 'left over' entries; left over entries use zeroed
+ values (and are wasted). So don't generate codebooks like
+ that */
quantvals=_book_maptype1_quantvals(b);
for(j=0;j<b->entries;j++){
- float last=0.f;
- int indexdiv=1;
- for(k=0;k<b->dim;k++){
- int index= (j/indexdiv)%quantvals;
- float val=b->quantlist[index];
- val=fabs(val)*delta+mindel+last;
- if(b->q_sequencep)last=val;
- r[j*b->dim+k]=val;
- indexdiv*=quantvals;
- }
+ if((sparsemap && b->lengthlist[j]) || !sparsemap){
+ float last=0.f;
+ int indexdiv=1;
+ for(k=0;k<b->dim;k++){
+ int index= (j/indexdiv)%quantvals;
+ float val=b->quantlist[index];
+ val=fabs(val)*delta+mindel+last;
+ if(b->q_sequencep)last=val;
+ if(sparsemap)
+ r[sparsemap[count]*b->dim+k]=val;
+ else
+ r[count*b->dim+k]=val;
+ indexdiv*=quantvals;
+ }
+ count++;
+ }
+
}
break;
case 2:
for(j=0;j<b->entries;j++){
- float last=0.f;
- for(k=0;k<b->dim;k++){
- float val=b->quantlist[j*b->dim+k];
- val=fabs(val)*delta+mindel+last;
- if(b->q_sequencep)last=val;
- r[j*b->dim+k]=val;
- }
+ if((sparsemap && b->lengthlist[j]) || !sparsemap){
+ float last=0.f;
+
+ for(k=0;k<b->dim;k++){
+ float val=b->quantlist[j*b->dim+k];
+ val=fabs(val)*delta+mindel+last;
+ if(b->q_sequencep)last=val;
+ if(sparsemap)
+ r[sparsemap[count]*b->dim+k]=val;
+ else
+ r[count*b->dim+k]=val;
+ }
+ count++;
+ }
}
break;
}
return(NULL);
}
-void vorbis_staticbook_clear(static_codebook *b){
+void vorbis_staticbook_destroy(static_codebook *b){
if(b->allocedp){
if(b->quantlist)_ogg_free(b->quantlist);
if(b->lengthlist)_ogg_free(b->lengthlist);
- if(b->nearest_tree){
- _ogg_free(b->nearest_tree->ptr0);
- _ogg_free(b->nearest_tree->ptr1);
- _ogg_free(b->nearest_tree->p);
- _ogg_free(b->nearest_tree->q);
- memset(b->nearest_tree,0,sizeof(*b->nearest_tree));
- _ogg_free(b->nearest_tree);
- }
- if(b->thresh_tree){
- _ogg_free(b->thresh_tree->quantthresh);
- _ogg_free(b->thresh_tree->quantmap);
- memset(b->thresh_tree,0,sizeof(*b->thresh_tree));
- _ogg_free(b->thresh_tree);
- }
-
memset(b,0,sizeof(*b));
- }
-}
-
-void vorbis_staticbook_destroy(static_codebook *b){
- if(b->allocedp){
- vorbis_staticbook_clear(b);
_ogg_free(b);
- }
+ } /* otherwise, it is in static memory */
}
void vorbis_book_clear(codebook *b){
/* static book is not cleared; we're likely called on the lookup and
the static codebook belongs to the info struct */
- if(b->decode_tree){
- _ogg_free(b->decode_tree->tab);
- _ogg_free(b->decode_tree->tabl);
-
- _ogg_free(b->decode_tree->ptr0);
- _ogg_free(b->decode_tree->ptr1);
- memset(b->decode_tree,0,sizeof(*b->decode_tree));
- _ogg_free(b->decode_tree);
- }
if(b->valuelist)_ogg_free(b->valuelist);
if(b->codelist)_ogg_free(b->codelist);
+
+ if(b->dec_index)_ogg_free(b->dec_index);
+ if(b->dec_codelengths)_ogg_free(b->dec_codelengths);
+ if(b->dec_firsttable)_ogg_free(b->dec_firsttable);
+
memset(b,0,sizeof(*b));
}
int vorbis_book_init_encode(codebook *c,const static_codebook *s){
- long j,k;
+
memset(c,0,sizeof(*c));
c->c=s;
c->entries=s->entries;
+ c->used_entries=s->entries;
c->dim=s->dim;
- c->codelist=_make_words(s->lengthlist,s->entries);
- c->valuelist=_book_unquantize(s);
-
- /* set the 'zero entry' */
- c->zeroentry=-1;
- if(c->valuelist){
- for(j=0;j<s->entries;j++){
- int flag=1;
- for(k=0;k<s->dim;k++){
- if(fabs(c->valuelist[j*s->dim+k])>1e-12f){
- flag=0;
- break;
- }
- }
- if(flag)
- c->zeroentry=j;
- }
- }
+ c->codelist=_make_words(s->lengthlist,s->entries,0);
+ /* c->valuelist=_book_unquantize(s,s->entries,NULL); */
+ c->quantvals=_book_maptype1_quantvals(s);
+ c->minval=(int)rint(_float32_unpack(s->q_min));
+ c->delta=(int)rint(_float32_unpack(s->q_delta));
return(0);
}
+static ogg_uint32_t bitreverse(ogg_uint32_t x){
+ x= ((x>>16)&0x0000ffffUL) | ((x<<16)&0xffff0000UL);
+ x= ((x>> 8)&0x00ff00ffUL) | ((x<< 8)&0xff00ff00UL);
+ x= ((x>> 4)&0x0f0f0f0fUL) | ((x<< 4)&0xf0f0f0f0UL);
+ x= ((x>> 2)&0x33333333UL) | ((x<< 2)&0xccccccccUL);
+ return((x>> 1)&0x55555555UL) | ((x<< 1)&0xaaaaaaaaUL);
+}
+
+static int sort32a(const void *a,const void *b){
+ return ( **(ogg_uint32_t **)a>**(ogg_uint32_t **)b)-
+ ( **(ogg_uint32_t **)a<**(ogg_uint32_t **)b);
+}
+
+/* decode codebook arrangement is more heavily optimized than encode */
int vorbis_book_init_decode(codebook *c,const static_codebook *s){
+ int i,j,n=0,tabn;
+ int *sortindex;
+
memset(c,0,sizeof(*c));
- c->c=s;
+
+ /* count actually used entries and find max length */
+ for(i=0;i<s->entries;i++)
+ if(s->lengthlist[i]>0)
+ n++;
+
c->entries=s->entries;
+ c->used_entries=n;
c->dim=s->dim;
- c->valuelist=_book_unquantize(s);
- c->decode_tree=_make_decode_tree(c);
- if(c->decode_tree==NULL)goto err_out;
- return(0);
- err_out:
- vorbis_book_clear(c);
- return(-1);
-}
-static float _dist(int el,float *ref, float *b,int step){
- int i;
- float acc=0.f;
- for(i=0;i<el;i++){
- float val=(ref[i]-b[i*step]);
- acc+=val*val;
- }
- return(acc);
-}
+ if(n>0){
+ /* two different remappings go on here.
-#include <stdio.h>
-int _best(codebook *book, float *a, int step){
- encode_aux_nearestmatch *nt=book->c->nearest_tree;
- encode_aux_threshmatch *tt=book->c->thresh_tree;
- encode_aux_pigeonhole *pt=book->c->pigeon_tree;
- int dim=book->dim;
- int ptr=0,k,o;
- /*int savebest=-1;
- float saverr;*/
-
- /* do we have a threshhold encode hint? */
- if(tt){
- int index=0;
- /* find the quant val of each scalar */
- for(k=0,o=step*(dim-1);k<dim;k++,o-=step){
- int i;
- /* linear search the quant list for now; it's small and although
- with > ~8 entries, it would be faster to bisect, this would be
- a misplaced optimization for now */
- for(i=0;i<tt->threshvals-1;i++)
- if(a[o]<tt->quantthresh[i])break;
-
- index=(index*tt->quantvals)+tt->quantmap[i];
- }
- /* regular lattices are easy :-) */
- if(book->c->lengthlist[index]>0) /* is this unused? If so, we'll
- use a decision tree after all
- and fall through*/
- return(index);
- }
+ First, we collapse the likely sparse codebook down only to
+ actually represented values/words. This collapsing needs to be
+ indexed as map-valueless books are used to encode original entry
+ positions as integers.
- /* do we have a pigeonhole encode hint? */
- if(pt){
- const static_codebook *c=book->c;
- int i,besti=-1;
- float best;
- int entry=0;
-
- /* dealing with sequentialness is a pain in the ass */
- if(c->q_sequencep){
- int pv;
- long mul=1;
- float qlast=0;
- for(k=0,o=0;k<dim;k++,o+=step){
- pv=(int)((a[o]-qlast-pt->min)/pt->del);
- if(pv<0 || pv>=pt->mapentries)break;
- entry+=pt->pigeonmap[pv]*mul;
- mul*=pt->quantvals;
- qlast+=pv*pt->del+pt->min;
- }
- }else{
- for(k=0,o=step*(dim-1);k<dim;k++,o-=step){
- int pv=(int)((a[o]-pt->min)/pt->del);
- if(pv<0 || pv>=pt->mapentries)break;
- entry=entry*pt->quantvals+pt->pigeonmap[pv];
- }
- }
+ Second, we reorder all vectors, including the entry index above,
+ by sorted bitreversed codeword to allow treeless decode. */
- /* must be within the pigeonholable range; if we quant outside (or
- in an entry that we define no list for), brute force it */
- if(k==dim && pt->fitlength[entry]){
- /* search the abbreviated list */
- long *list=pt->fitlist+pt->fitmap[entry];
- for(i=0;i<pt->fitlength[entry];i++){
- float this=_dist(dim,book->valuelist+list[i]*dim,a,step);
- if(besti==-1 || this<best){
- best=this;
- besti=list[i];
- }
- }
+ /* perform sort */
+ ogg_uint32_t *codes=_make_words(s->lengthlist,s->entries,c->used_entries);
+ ogg_uint32_t **codep=alloca(sizeof(*codep)*n);
- return(besti);
+ if(codes==NULL)goto err_out;
+
+ for(i=0;i<n;i++){
+ codes[i]=bitreverse(codes[i]);
+ codep[i]=codes+i;
}
- }
- if(nt){
- /* optimized using the decision tree */
- while(1){
- float c=0.f;
- float *p=book->valuelist+nt->p[ptr];
- float *q=book->valuelist+nt->q[ptr];
-
- for(k=0,o=0;k<dim;k++,o+=step)
- c+=(p[k]-q[k])*(a[o]-(p[k]+q[k])*.5);
-
- if(c>0.f) /* in A */
- ptr= -nt->ptr0[ptr];
- else /* in B */
- ptr= -nt->ptr1[ptr];
- if(ptr<=0)break;
+ qsort(codep,n,sizeof(*codep),sort32a);
+
+ sortindex=alloca(n*sizeof(*sortindex));
+ c->codelist=_ogg_malloc(n*sizeof(*c->codelist));
+ /* the index is a reverse index */
+ for(i=0;i<n;i++){
+ int position=codep[i]-codes;
+ sortindex[position]=i;
}
- return(-ptr);
- }
- /* brute force it! */
- {
- const static_codebook *c=book->c;
- int i,besti=-1;
- float best;
- float *e=book->valuelist;
- for(i=0;i<book->entries;i++){
- if(c->lengthlist[i]>0){
- float this=_dist(dim,e,a,step);
- if(besti==-1 || this<best){
- best=this;
- besti=i;
- }
+ for(i=0;i<n;i++)
+ c->codelist[sortindex[i]]=codes[i];
+ _ogg_free(codes);
+
+ c->valuelist=_book_unquantize(s,n,sortindex);
+ c->dec_index=_ogg_malloc(n*sizeof(*c->dec_index));
+
+ for(n=0,i=0;i<s->entries;i++)
+ if(s->lengthlist[i]>0)
+ c->dec_index[sortindex[n++]]=i;
+
+ c->dec_codelengths=_ogg_malloc(n*sizeof(*c->dec_codelengths));
+ c->dec_maxlength=0;
+ for(n=0,i=0;i<s->entries;i++)
+ if(s->lengthlist[i]>0){
+ c->dec_codelengths[sortindex[n++]]=s->lengthlist[i];
+ if(s->lengthlist[i]>c->dec_maxlength)
+ c->dec_maxlength=s->lengthlist[i];
}
- e+=dim;
- }
- /*if(savebest!=-1 && savebest!=besti){
- fprintf(stderr,"brute force/pigeonhole disagreement:\n"
- "original:");
- for(i=0;i<dim*step;i+=step)fprintf(stderr,"%g,",a[i]);
- fprintf(stderr,"\n"
- "pigeonhole (entry %d, err %g):",savebest,saverr);
- for(i=0;i<dim;i++)fprintf(stderr,"%g,",
- (book->valuelist+savebest*dim)[i]);
- fprintf(stderr,"\n"
- "bruteforce (entry %d, err %g):",besti,best);
- for(i=0;i<dim;i++)fprintf(stderr,"%g,",
- (book->valuelist+besti*dim)[i]);
- fprintf(stderr,"\n");
- }*/
- return(besti);
- }
-}
+ if(n==1 && c->dec_maxlength==1){
+ /* special case the 'single entry codebook' with a single bit
+ fastpath table (that always returns entry 0 )in order to use
+ unmodified decode paths. */
+ c->dec_firsttablen=1;
+ c->dec_firsttable=_ogg_calloc(2,sizeof(*c->dec_firsttable));
+ c->dec_firsttable[0]=c->dec_firsttable[1]=1;
-/* returns the entry number and *modifies a* to the remainder value ********/
-int vorbis_book_besterror(codebook *book,float *a,int step,int addmul){
- int dim=book->dim,i,o;
- int best=_best(book,a,step);
- switch(addmul){
- case 0:
- for(i=0,o=0;i<dim;i++,o+=step)
- a[o]-=(book->valuelist+best*dim)[i];
- break;
- case 1:
- for(i=0,o=0;i<dim;i++,o+=step){
- float val=(book->valuelist+best*dim)[i];
- if(val==0){
- a[o]=0;
- }else{
- a[o]/=val;
+ }else{
+ c->dec_firsttablen=ov_ilog(c->used_entries)-4; /* this is magic */
+ if(c->dec_firsttablen<5)c->dec_firsttablen=5;
+ if(c->dec_firsttablen>8)c->dec_firsttablen=8;
+
+ tabn=1<<c->dec_firsttablen;
+ c->dec_firsttable=_ogg_calloc(tabn,sizeof(*c->dec_firsttable));
+
+ for(i=0;i<n;i++){
+ if(c->dec_codelengths[i]<=c->dec_firsttablen){
+ ogg_uint32_t orig=bitreverse(c->codelist[i]);
+ for(j=0;j<(1<<(c->dec_firsttablen-c->dec_codelengths[i]));j++)
+ c->dec_firsttable[orig|(j<<c->dec_codelengths[i])]=i+1;
+ }
+ }
+
+ /* now fill in 'unused' entries in the firsttable with hi/lo search
+ hints for the non-direct-hits */
+ {
+ ogg_uint32_t mask=0xfffffffeUL<<(31-c->dec_firsttablen);
+ long lo=0,hi=0;
+
+ for(i=0;i<tabn;i++){
+ ogg_uint32_t word=i<<(32-c->dec_firsttablen);
+ if(c->dec_firsttable[bitreverse(word)]==0){
+ while((lo+1)<n && c->codelist[lo+1]<=word)lo++;
+ while( hi<n && word>=(c->codelist[hi]&mask))hi++;
+
+ /* we only actually have 15 bits per hint to play with here.
+ In order to overflow gracefully (nothing breaks, efficiency
+ just drops), encode as the difference from the extremes. */
+ {
+ unsigned long loval=lo;
+ unsigned long hival=n-hi;
+
+ if(loval>0x7fff)loval=0x7fff;
+ if(hival>0x7fff)hival=0x7fff;
+ c->dec_firsttable[bitreverse(word)]=
+ 0x80000000UL | (loval<<15) | hival;
+ }
+ }
+ }
}
}
- break;
}
- return(best);
+
+ return(0);
+ err_out:
+ vorbis_book_clear(c);
+ return(-1);
}
long vorbis_book_codeword(codebook *book,int entry){
- return book->codelist[entry];
+ if(book->c) /* only use with encode; decode optimizations are
+ allowed to break this */
+ return book->codelist[entry];
+ return -1;
}
long vorbis_book_codelen(codebook *book,int entry){
- return book->c->lengthlist[entry];
+ if(book->c) /* only use with encode; decode optimizations are
+ allowed to break this */
+ return book->c->lengthlist[entry];
+ return -1;
}
#ifdef _V_SELFTEST
0,
0,0,0,0,
NULL,
- NULL,NULL
+ 0
};
static float *test1_result=NULL;
-
+
/* linear, full mapping, nonsequential */
static_codebook test2={
4,3,
2,
-533200896,1611661312,4,0,
full_quantlist1,
- NULL,NULL
+ 0
};
static float test2_result[]={-3,-2,-1,0, 1,2,3,4, 5,0,3,-2};
2,
-533200896,1611661312,4,1,
full_quantlist1,
- NULL,NULL
+ 0
};
static float test3_result[]={-3,-5,-6,-6, 1,3,6,10, 5,5,8,6};
1,
-533200896,1611661312,4,0,
partial_quantlist1,
- NULL,NULL
+ 0
};
static float test4_result[]={-3,-3,-3, 4,-3,-3, -1,-3,-3,
- -3, 4,-3, 4, 4,-3, -1, 4,-3,
- -3,-1,-3, 4,-1,-3, -1,-1,-3,
- -3,-3, 4, 4,-3, 4, -1,-3, 4,
- -3, 4, 4, 4, 4, 4, -1, 4, 4,
- -3,-1, 4, 4,-1, 4, -1,-1, 4,
- -3,-3,-1, 4,-3,-1, -1,-3,-1,
- -3, 4,-1, 4, 4,-1, -1, 4,-1,
- -3,-1,-1, 4,-1,-1, -1,-1,-1};
+ -3, 4,-3, 4, 4,-3, -1, 4,-3,
+ -3,-1,-3, 4,-1,-3, -1,-1,-3,
+ -3,-3, 4, 4,-3, 4, -1,-3, 4,
+ -3, 4, 4, 4, 4, 4, -1, 4, 4,
+ -3,-1, 4, 4,-1, 4, -1,-1, 4,
+ -3,-3,-1, 4,-3,-1, -1,-3,-1,
+ -3, 4,-1, 4, 4,-1, -1, 4,-1,
+ -3,-1,-1, 4,-1,-1, -1,-1,-1};
/* linear, algorithmic mapping, sequential */
static_codebook test5={
1,
-533200896,1611661312,4,1,
partial_quantlist1,
- NULL,NULL
+ 0
};
static float test5_result[]={-3,-6,-9, 4, 1,-2, -1,-4,-7,
- -3, 1,-2, 4, 8, 5, -1, 3, 0,
- -3,-4,-7, 4, 3, 0, -1,-2,-5,
- -3,-6,-2, 4, 1, 5, -1,-4, 0,
- -3, 1, 5, 4, 8,12, -1, 3, 7,
- -3,-4, 0, 4, 3, 7, -1,-2, 2,
- -3,-6,-7, 4, 1, 0, -1,-4,-5,
- -3, 1, 0, 4, 8, 7, -1, 3, 2,
- -3,-4,-5, 4, 3, 2, -1,-2,-3};
+ -3, 1,-2, 4, 8, 5, -1, 3, 0,
+ -3,-4,-7, 4, 3, 0, -1,-2,-5,
+ -3,-6,-2, 4, 1, 5, -1,-4, 0,
+ -3, 1, 5, 4, 8,12, -1, 3, 7,
+ -3,-4, 0, 4, 3, 7, -1,-2, 2,
+ -3,-6,-7, 4, 1, 0, -1,-4,-5,
+ -3, 1, 0, 4, 8, 7, -1, 3, 2,
+ -3,-4,-5, 4, 3, 2, -1,-2,-3};
void run_test(static_codebook *b,float *comp){
- float *out=_book_unquantize(b);
+ float *out=_book_unquantize(b,b->entries,NULL);
int i;
if(comp){
for(i=0;i<b->entries*b->dim;i++)
if(fabs(out[i]-comp[i])>.0001){
- fprintf(stderr,"disagreement in unquantized and reference data:\n"
- "position %d, %g != %g\n",i,out[i],comp[i]);
- exit(1);
+ fprintf(stderr,"disagreement in unquantized and reference data:\n"
+ "position %d, %g != %g\n",i,out[i],comp[i]);
+ exit(1);
}
}else{
if(out){
fprintf(stderr,"_book_unquantize returned a value array: \n"
- " correct result should have been NULL\n");
+ " correct result should have been NULL\n");
exit(1);
}
}
fprintf(stderr,"OK\nDequant test 5... ");
run_test(&test5,test5_result);
fprintf(stderr,"OK\n\n");
-
+
return(0);
}
projects / platform / upstream / libvorbis.git / blobdiff