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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 1994-2014 *
* by the Xiph.Org Foundation http://www.xiph.org/ *
* *
********************************************************************
function: hufftree builder
********************************************************************/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
#include "bookutil.h"
static int nsofar=0;
static int getval(FILE *in,int begin,int n,int group,int max){
float v;
int i;
long val=0;
if(nsofar>=n || get_line_value(in,&v)){
reset_next_value();
nsofar=0;
if(get_next_value(in,&v))
return(-1);
for(i=1;i<=begin;i++)
get_line_value(in,&v);
}
val=(int)v;
nsofar++;
for(i=1;i<group;i++,nsofar++)
if(nsofar>=n || get_line_value(in,&v))
return(getval(in,begin,n,group,max));
else
val = val*max+(int)v;
return(val);
}
static void usage(){
fprintf(stderr,
"usage:\n"
"huffbuild <input>.vqd <begin,n,group>|<lorange-hirange> [noguard]\n"
" where begin,n,group is first scalar, \n"
" number of scalars of each in line,\n"
" number of scalars in a group\n"
"eg: huffbuild reslongaux.vqd 0,1024,4\n"
"produces reslongaux.vqh\n\n");
exit(1);
}
int main(int argc, char *argv[]){
char *base;
char *infile;
int i,j,k,begin,n,subn,guard=1;
FILE *file;
int maxval=0;
int loval=0;
if(argc<3)usage();
if(argc==4)guard=0;
infile=strdup(argv[1]);
base=strdup(infile);
if(strrchr(base,'.'))
strrchr(base,'.')[0]='\0';
{
char *pos=strchr(argv[2],',');
char *dpos=strchr(argv[2],'-');
if(dpos){
loval=atoi(argv[2]);
maxval=atoi(dpos+1);
subn=1;
begin=0;
}else{
begin=atoi(argv[2]);
if(!pos)
usage();
else
n=atoi(pos+1);
pos=strchr(pos+1,',');
if(!pos)
usage();
else
subn=atoi(pos+1);
if(n/subn*subn != n){
fprintf(stderr,"n must be divisible by group\n");
exit(1);
}
}
}
/* scan the file for maximum value */
file=fopen(infile,"r");
if(!file){
fprintf(stderr,"Could not open file %s\n",infile);
if(!maxval)
exit(1);
else
fprintf(stderr," making untrained books.\n");
}
if(!maxval){
i=0;
while(1){
long v;
if(get_next_ivalue(file,&v))break;
if(v>maxval)maxval=v;
if(!(i++&0xff))spinnit("loading... ",i);
}
rewind(file);
maxval++;
}
{
long vals=pow(maxval,subn);
long *hist=_ogg_calloc(vals,sizeof(long));
long *lengths=_ogg_calloc(vals,sizeof(long));
for(j=loval;j<vals;j++)hist[j]=guard;
if(file){
reset_next_value();
i/=subn;
while(!feof(file)){
long val=getval(file,begin,n,subn,maxval);
if(val==-1 || val>=vals)break;
hist[val]++;
if(!(i--&0xff))spinnit("loading... ",i*subn);
}
fclose(file);
}
/* we have the probabilities, build the tree */
fprintf(stderr,"Building tree for %ld entries\n",vals);
build_tree_from_lengths0(vals,hist,lengths);
/* save the book */
{
char *buffer=alloca(strlen(base)+5);
strcpy(buffer,base);
strcat(buffer,".vqh");
file=fopen(buffer,"w");
if(!file){
fprintf(stderr,"Could not open file %s\n",buffer);
exit(1);
}
}
/* first, the static vectors, then the book structure to tie it together. */
/* lengthlist */
fprintf(file,"static const char _huff_lengthlist_%s[] = {\n",base);
for(j=0;j<vals;){
fprintf(file,"\t");
for(k=0;k<16 && j<vals;k++,j++)
fprintf(file,"%2ld,",lengths[j]);
fprintf(file,"\n");
}
fprintf(file,"};\n\n");
/* the toplevel book */
fprintf(file,"static const static_codebook _huff_book_%s = {\n",base);
fprintf(file,"\t%d, %ld,\n",subn,vals);
fprintf(file,"\t(char *)_huff_lengthlist_%s,\n",base);
fprintf(file,"\t0, 0, 0, 0, 0,\n");
fprintf(file,"\tNULL,\n");
fprintf(file,"\t0\n};\n\n");
fclose(file);
fprintf(stderr,"Done. \n\n");
}
exit(0);
}
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