From 74f4b1bc3b627ba4c7e03498234d88cacdfbe97b Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Wed, 29 Sep 2021 22:52:49 +0200
Subject: Squashed 'vorbis/' content from commit d22c3ab5f

git-subtree-dir: vorbis
git-subtree-split: d22c3ab5f633460abc2532feee60ca0892134cbf
---
 vq/huffbuild.c | 197 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 197 insertions(+)
 create mode 100644 vq/huffbuild.c

(limited to 'vq/huffbuild.c')

diff --git a/vq/huffbuild.c b/vq/huffbuild.c
new file mode 100644
index 0000000..014c81c
--- /dev/null
+++ b/vq/huffbuild.c
@@ -0,0 +1,197 @@
+/********************************************************************
+ *                                                                  *
+ * 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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