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: utility main for building codebooks from lattice descriptions
14 last mod: $Id: latticebuild.c,v 1.12 2001/12/20 01:00:39 segher Exp $
16 ********************************************************************/
25 /* The purpose of this util is just to finish packaging the
26 description into a static codebook. It used to count hits for a
27 histogram, but I've divorced that out to add some flexibility (it
28 currently generates an equal probability codebook)
31 latticebuild description.vql
33 the lattice description file contains two lines:
35 <n> <dim> <multiplicitavep> <sequentialp>
36 <value_0> <value_1> <value_2> ... <value_n-1>
38 a threshmap (or pigeonmap) struct is generated by latticehint;
39 there are fun tricks one can do with the threshmap and cascades,
40 but the utils don't know them...
42 entropy encoding is done by feeding an entry list collected from a
43 training set and feeding it to latticetune along with the book.
45 latticebuild produces a codebook on stdout */
47 static int ilog(unsigned int v){
56 int main(int argc,char *argv[]){
62 int entries=-1,dim=-1,quantvals=-1,addmul=-1,sequencep=0;
67 memset(&b,0,sizeof(b));
68 memset(&c,0,sizeof(c));
71 fprintf(stderr,"Need a lattice description file on the command line.\n");
77 char *filename=_ogg_calloc(strlen(argv[1])+4,1);
79 strcpy(filename,argv[1]);
80 in=fopen(filename,"r");
82 fprintf(stderr,"Could not open input file %s\n",filename);
86 ptr=strrchr(filename,'.');
89 name=strdup(filename);
91 name=strdup(filename);
96 /* read the description */
98 if(sscanf(line,"%d %d %d %d",&quantvals,&dim,&addmul,&sequencep)!=4){
99 if(sscanf(line,"%d %d %d",&quantvals,&dim,&addmul)!=3){
100 fprintf(stderr,"Syntax error reading description file (line 1)\n");
104 entries=pow(quantvals,dim);
107 c.lengthlist=_ogg_malloc(entries*sizeof(long));
109 c.q_sequencep=sequencep;
110 c.quantlist=_ogg_calloc(quantvals,sizeof(long));
112 quantlist=_ogg_malloc(sizeof(double)*c.dim*c.entries);
113 hits=_ogg_malloc(c.entries*sizeof(long));
114 for(j=0;j<entries;j++)hits[j]=1;
115 for(j=0;j<entries;j++)c.lengthlist[j]=1;
119 for(j=0;j<quantvals;j++){
121 if(!line || sscanf(line,"%lf",quantlist+j)!=1){
122 fprintf(stderr,"Ran out of data on line 2 of description file\n");
125 temp=strchr(line,',');
126 if(!temp)temp=strchr(line,' ');
131 /* gen a real quant list from the more easily human-grokked input */
133 double min=quantlist[0];
136 for(j=1;j<quantvals;j++)if(quantlist[j]<min)min=quantlist[j];
137 for(j=0;j<quantvals;j++)
138 for(i=j+1;i<quantvals;i++)
139 if(mindel==-1 || fabs(quantlist[j]-quantlist[i])<mindel)
140 mindel=fabs(quantlist[j]-quantlist[i]);
144 for(j=0;j<quantvals;j++){
145 double test=fac*(quantlist[j]-min)/mindel;
146 if( fabs(rint(test)-test)>.00001f) break;
149 if(j<quantvals)fac++;
153 fprintf(stderr,"min=%g mindel=%g\n",min,mindel);
155 c.q_min=_float32_pack(min);
156 c.q_delta=_float32_pack(mindel);
159 min=_float32_unpack(c.q_min);
160 mindel=_float32_unpack(c.q_delta);
161 for(j=0;j<quantvals;j++){
162 c.quantlist[j]=rint((quantlist[j]-min)/mindel);
163 if(ilog(c.quantlist[j])>c.q_quant)c.q_quant=ilog(c.quantlist[j]);
167 /* build the [default] codeword lengths */
168 memset(c.lengthlist,0,sizeof(long)*entries);
169 for(i=0;i<entries;i++)hits[i]=1;
170 build_tree_from_lengths(entries,hits,c.lengthlist);
172 /* save the book in C header form */
173 write_codebook(stdout,name,&c);