1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
5 * THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH *
6 * THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
9 * by Monty <monty@xiph.org> and the XIPHOPHORUS Company *
10 * http://www.xiph.org/ *
12 ********************************************************************
14 function: utility main for building codebooks from lattice descriptions
15 last mod: $Id: latticebuild.c,v 1.9 2001/01/22 01:38:51 xiphmont Exp $
17 ********************************************************************/
26 /* The purpose of this util is just to finish packaging the
27 description into a static codebook. It used to count hits for a
28 histogram, but I've divorced that out to add some flexibility (it
29 currently generates an equal probability codebook)
32 latticebuild description.vql
34 the lattice description file contains two lines:
36 <n> <dim> <multiplicitavep> <sequentialp>
37 <value_0> <value_1> <value_2> ... <value_n-1>
39 a threshmap (or pigeonmap) struct is generated by latticehint;
40 there are fun tricks one can do with the threshmap and cascades,
41 but the utils don't know them...
43 entropy encoding is done by feeding an entry list collected from a
44 training set and feeding it to latticetune along with the book.
46 latticebuild produces a codebook on stdout */
48 static int ilog(unsigned int v){
57 int main(int argc,char *argv[]){
63 int entries=-1,dim=-1,quantvals=-1,addmul=-1,sequencep=0;
68 memset(&b,0,sizeof(b));
69 memset(&c,0,sizeof(c));
72 fprintf(stderr,"Need a lattice description file on the command line.\n");
78 char *filename=_ogg_calloc(strlen(argv[1])+4,1);
80 strcpy(filename,argv[1]);
81 in=fopen(filename,"r");
83 fprintf(stderr,"Could not open input file %s\n",filename);
87 ptr=strrchr(filename,'.');
90 name=strdup(filename);
92 name=strdup(filename);
97 /* read the description */
99 if(sscanf(line,"%d %d %d %d",&quantvals,&dim,&addmul,&sequencep)!=4){
100 if(sscanf(line,"%d %d %d",&quantvals,&dim,&addmul)!=3){
101 fprintf(stderr,"Syntax error reading description file (line 1)\n");
105 entries=pow(quantvals,dim);
108 c.lengthlist=_ogg_malloc(entries*sizeof(long));
110 c.q_sequencep=sequencep;
111 c.quantlist=_ogg_calloc(quantvals,sizeof(long));
113 quantlist=_ogg_malloc(sizeof(double)*c.dim*c.entries);
114 hits=_ogg_malloc(c.entries*sizeof(long));
115 for(j=0;j<entries;j++)hits[j]=1;
116 for(j=0;j<entries;j++)c.lengthlist[j]=1;
120 for(j=0;j<quantvals;j++){
122 if(!line || sscanf(line,"%lf",quantlist+j)!=1){
123 fprintf(stderr,"Ran out of data on line 2 of description file\n");
126 temp=strchr(line,',');
127 if(!temp)temp=strchr(line,' ');
132 /* gen a real quant list from the more easily human-grokked input */
134 double min=quantlist[0];
137 for(j=1;j<quantvals;j++)if(quantlist[j]<min)min=quantlist[j];
138 for(j=0;j<quantvals;j++)
139 for(i=j+1;i<quantvals;i++)
140 if(mindel==-1 || fabs(quantlist[j]-quantlist[i])<mindel)
141 mindel=fabs(quantlist[j]-quantlist[i]);
145 for(j=0;j<quantvals;j++){
146 double test=fac*(quantlist[j]-min)/mindel;
147 if( fabs(rint(test)-test)>.00001f) break;
150 if(j<quantvals)fac++;
154 fprintf(stderr,"min=%g mindel=%g\n",min,mindel);
156 c.q_min=_float32_pack(min);
157 c.q_delta=_float32_pack(mindel);
160 min=_float32_unpack(c.q_min);
161 mindel=_float32_unpack(c.q_delta);
162 for(j=0;j<quantvals;j++){
163 c.quantlist[j]=rint((quantlist[j]-min)/mindel);
164 if(ilog(c.quantlist[j])>c.q_quant)c.q_quant=ilog(c.quantlist[j]);
168 /* build the [default] codeword lengths */
169 memset(c.lengthlist,0,sizeof(long)*entries);
170 for(i=0;i<entries;i++)hits[i]=1;
171 build_tree_from_lengths(entries,hits,c.lengthlist);
173 /* save the book in C header form */
174 write_codebook(stdout,name,&c);