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Multiplier-free entropy coder

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Timothy B. Terriberry 2007-12-06 15:09:53 +11:00 • committed by Jean-Marc Valin
parent aeb4467d7f
commit 2ec8d9e522
26 changed files with 1597 additions and 2 deletions
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32
libentcode/probmod.c Normal file
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#include <stdlib.h>
#include <string.h>
#include "probmod.h"
#include "bitree.h"
void ec_probmod_init(ec_probmod *_this,unsigned _sz){
ec_probmod_init_full(_this,_sz,1U,1U<<23,NULL);
}
void ec_probmod_init_from_counts(ec_probmod *_this,unsigned _sz,
const unsigned *_counts){
ec_probmod_init_full(_this,_sz,1U,1U<<23,_counts);
}
void ec_probmod_init_full(ec_probmod *_this,unsigned _sz,unsigned _inc,
unsigned _thresh,const unsigned *_counts){
unsigned s;
_this->sz=_sz;
for(s=1;s<=_this->sz;s<<=1);
_this->split=s>>1;
_this->inc=_inc;
_this->thresh=_thresh;
_this->bitree=(unsigned *)malloc(_sz*sizeof(*_this->bitree));
if(_counts!=NULL)memcpy(_this->bitree,_counts,_sz*sizeof(*_this->bitree));
else for(s=0;s<_this->sz;s++)_this->bitree[s]=1;
ec_bitree_from_counts(_this->bitree,_sz);
_this->ft=ec_bitree_get_cumul(_this->bitree,_sz);
}
void ec_probmod_clear(ec_probmod *_this){
free(_this->bitree);
}