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 1.8 2000/11/08 03:23:23 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 book 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(long)*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++){
121 if(get_line_value(in,quantlist+j)==-1){
122 fprintf(stderr,"Ran out of data on line 2 of description file\n");
127 /* gen a real quant list from the more easily human-grokked input */
129 float min=quantlist[0];
132 for(j=1;j<quantvals;j++)if(quantlist[j]<min)min=quantlist[j];
133 for(j=0;j<quantvals;j++)
134 for(i=j+1;i<quantvals;i++)
135 if(mindel==-1 || fabs(quantlist[j]-quantlist[i])<mindel)
136 mindel=fabs(quantlist[j]-quantlist[i]);
140 for(j=0;j<quantvals;j++){
141 float test=(quantlist[j]-min)/(mindel/fac);
142 if( fabs(rint(test)-test)>.000001) break;
144 if(j<quantvals)fac++;
148 fprintf(stderr,"min=%g mindel=%g\n",min,mindel);
150 c.q_min=_float32_pack(min);
151 c.q_delta=_float32_pack(mindel);
154 min=_float32_unpack(c.q_min);
155 mindel=_float32_unpack(c.q_delta);
156 for(j=0;j<quantvals;j++){
157 c.quantlist[j]=rint((quantlist[j]-min)/mindel);
158 if(ilog(c.quantlist[j])>c.q_quant)c.q_quant=ilog(c.quantlist[j]);
162 /* build the [default] codeword lengths */
163 memset(c.lengthlist,0,sizeof(long)*entries);
164 for(i=0;i<entries;i++)hits[i]=1;
165 build_tree_from_lengths(entries,hits,c.lengthlist);
167 /* save the book in C header form */
168 write_codebook(stdout,name,&c);