rockbox - My Rockbox tree

path: root/apps/plugins/lua/rocklib_aux.pl

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author	Jonathan Gordon <rockbox@jdgordon.info>	2011-09-11 10:48:19 +0000
committer	Jonathan Gordon <rockbox@jdgordon.info>	2011-09-11 10:48:19 +0000
commit	6c1de04a6315f0a970ea10b72af35c05bff2ce02 (patch)
tree	680a03651487746652c4132da9302ae99314af21 /apps/plugins/lua/rocklib_aux.pl
parent	3d0317a273a99f277d88c491181ba220db9dd2b0 (diff)
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fix red

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30503 a1c6a512-1295-4272-9138-f99709370657

Diffstat (limited to 'apps/plugins/lua/rocklib_aux.pl')

0 files changed, 0 insertions, 0 deletions

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/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

 function: basic shared codebook operations

 ********************************************************************/

#include "config-tremor.h"
#include <math.h>
#include <string.h>
#include "ogg.h"
#include "os.h"
#include "misc.h"
#include "ivorbiscodec.h"
#include "codebook.h"

/**** pack/unpack helpers ******************************************/
int _ilog(unsigned int v){
  int ret=0;
  while(v){
    ret++;
    v>>=1;
  }
  return(ret);
}

/* 32 bit float (not IEEE; nonnormalized mantissa +
   biased exponent) : neeeeeee eeemmmmm mmmmmmmm mmmmmmmm 
   Why not IEEE?  It's just not that important here. */

#define VQ_FEXP 10
#define VQ_FMAN 21
#define VQ_FEXP_BIAS 768 /* bias toward values smaller than 1. */

static ogg_int32_t _float32_unpack(long val,int *point){
  long   mant=val&0x1fffff;
  int    sign=val&0x80000000;
  long   exp =(val&0x7fe00000L)>>VQ_FMAN;

  exp-=(VQ_FMAN-1)+VQ_FEXP_BIAS;

  if(mant){
    while(!(mant&0x40000000)){
      mant<<=1;
      exp-=1;
    }

    if(sign)mant= -mant;
  }else{
    sign=0;
    exp=-9999;
  }

  *point=exp;
  return mant;
}

/* given a list of word lengths, generate a list of codewords.  Works
   for length ordered or unordered, always assigns the lowest valued
   codewords first.  Extended to handle unused entries (length 0) */
static ogg_uint32_t *_make_words(long *l,long n,long sparsecount){
  long i,j,count=0;
  ogg_uint32_t marker[33];
  ogg_uint32_t *r=(ogg_uint32_t *)_ogg_malloc((sparsecount?sparsecount:n)*sizeof(*r));
  memset(marker,0,sizeof(marker));

  for(i=0;i<n;i++){
    long length=l[i];
    if(length>0){
      ogg_uint32_t entry=marker[length];
      
      /* when we claim a node for an entry, we also claim the nodes
	 below it (pruning off the imagined tree that may have dangled
	 from it) as well as blocking the use of any nodes directly
	 above for leaves */
      
      /* update ourself */
      if(length<32 && (entry>>length)){
	/* error condition; the lengths must specify an overpopulated tree */
	_ogg_free(r);
	return(NULL);
      }
      r[count++]=entry;
    
      /* Look to see if the next shorter marker points to the node
	 above. if so, update it and repeat.  */
      {
	for(j=length;j>0;j--){
	  
	  if(marker[j]&1){
	    /* have to jump branches */
	    if(j==1)
	      marker[1]++;
	    else
	      marker[j]=marker[j-1]<<1;
	    break; /* invariant says next upper marker would already
		      have been moved if it was on the same path */
	  }
	  marker[j]++;
	}
      }
      
      /* prune the tree; the implicit invariant says all the longer
	 markers were dangling from our just-taken node.  Dangle them
	 from our *new* node. */
      for(j=length+1;j<33;j++)
	if((marker[j]>>1) == entry){
	  entry=marker[j];


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