diff options
Diffstat (limited to 'lib/dequant.c')
| -rw-r--r-- | lib/dequant.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/lib/dequant.c b/lib/dequant.c new file mode 100644 index 0000000..e554872 --- /dev/null +++ b/lib/dequant.c @@ -0,0 +1,182 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggTheora 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 Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 * + * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * + * * + ******************************************************************** + + function: + last mod: $Id: dequant.c 16503 2009-08-22 18:14:02Z giles $ + + ********************************************************************/ + +#include <stdlib.h> +#include <string.h> +#include <ogg/ogg.h> +#include "dequant.h" +#include "decint.h" + +int oc_quant_params_unpack(oc_pack_buf *_opb,th_quant_info *_qinfo){ + th_quant_base *base_mats; + long val; + int nbase_mats; + int sizes[64]; + int indices[64]; + int nbits; + int bmi; + int ci; + int qti; + int pli; + int qri; + int qi; + int i; + val=oc_pack_read(_opb,3); + nbits=(int)val; + for(qi=0;qi<64;qi++){ + val=oc_pack_read(_opb,nbits); + _qinfo->loop_filter_limits[qi]=(unsigned char)val; + } + val=oc_pack_read(_opb,4); + nbits=(int)val+1; + for(qi=0;qi<64;qi++){ + val=oc_pack_read(_opb,nbits); + _qinfo->ac_scale[qi]=(ogg_uint16_t)val; + } + val=oc_pack_read(_opb,4); + nbits=(int)val+1; + for(qi=0;qi<64;qi++){ + val=oc_pack_read(_opb,nbits); + _qinfo->dc_scale[qi]=(ogg_uint16_t)val; + } + val=oc_pack_read(_opb,9); + nbase_mats=(int)val+1; + base_mats=_ogg_malloc(nbase_mats*sizeof(base_mats[0])); + if(base_mats==NULL)return TH_EFAULT; + for(bmi=0;bmi<nbase_mats;bmi++){ + for(ci=0;ci<64;ci++){ + val=oc_pack_read(_opb,8); + base_mats[bmi][ci]=(unsigned char)val; + } + } + nbits=oc_ilog(nbase_mats-1); + for(i=0;i<6;i++){ + th_quant_ranges *qranges; + th_quant_base *qrbms; + int *qrsizes; + qti=i/3; + pli=i%3; + qranges=_qinfo->qi_ranges[qti]+pli; + if(i>0){ + val=oc_pack_read1(_opb); + if(!val){ + int qtj; + int plj; + if(qti>0){ + val=oc_pack_read1(_opb); + if(val){ + qtj=qti-1; + plj=pli; + } + else{ + qtj=(i-1)/3; + plj=(i-1)%3; + } + } + else{ + qtj=(i-1)/3; + plj=(i-1)%3; + } + *qranges=*(_qinfo->qi_ranges[qtj]+plj); + continue; + } + } + val=oc_pack_read(_opb,nbits); + indices[0]=(int)val; + for(qi=qri=0;qi<63;){ + val=oc_pack_read(_opb,oc_ilog(62-qi)); + sizes[qri]=(int)val+1; + qi+=(int)val+1; + val=oc_pack_read(_opb,nbits); + indices[++qri]=(int)val; + } + /*Note: The caller is responsible for cleaning up any partially + constructed qinfo.*/ + if(qi>63){ + _ogg_free(base_mats); + return TH_EBADHEADER; + } + qranges->nranges=qri; + qranges->sizes=qrsizes=(int *)_ogg_malloc(qri*sizeof(qrsizes[0])); + if(qranges->sizes==NULL){ + /*Note: The caller is responsible for cleaning up any partially + constructed qinfo.*/ + _ogg_free(base_mats); + return TH_EFAULT; + } + memcpy(qrsizes,sizes,qri*sizeof(qrsizes[0])); + qrbms=(th_quant_base *)_ogg_malloc((qri+1)*sizeof(qrbms[0])); + if(qrbms==NULL){ + /*Note: The caller is responsible for cleaning up any partially + constructed qinfo.*/ + _ogg_free(base_mats); + return TH_EFAULT; + } + qranges->base_matrices=(const th_quant_base *)qrbms; + do{ + bmi=indices[qri]; + /*Note: The caller is responsible for cleaning up any partially + constructed qinfo.*/ + if(bmi>=nbase_mats){ + _ogg_free(base_mats); + return TH_EBADHEADER; + } + memcpy(qrbms[qri],base_mats[bmi],sizeof(qrbms[qri])); + } + while(qri-->0); + } + _ogg_free(base_mats); + return 0; +} + +void oc_quant_params_clear(th_quant_info *_qinfo){ + int i; + for(i=6;i-->0;){ + int qti; + int pli; + qti=i/3; + pli=i%3; + /*Clear any duplicate pointer references.*/ + if(i>0){ + int qtj; + int plj; + qtj=(i-1)/3; + plj=(i-1)%3; + if(_qinfo->qi_ranges[qti][pli].sizes== + _qinfo->qi_ranges[qtj][plj].sizes){ + _qinfo->qi_ranges[qti][pli].sizes=NULL; + } + if(_qinfo->qi_ranges[qti][pli].base_matrices== + _qinfo->qi_ranges[qtj][plj].base_matrices){ + _qinfo->qi_ranges[qti][pli].base_matrices=NULL; + } + } + if(qti>0){ + if(_qinfo->qi_ranges[1][pli].sizes== + _qinfo->qi_ranges[0][pli].sizes){ + _qinfo->qi_ranges[1][pli].sizes=NULL; + } + if(_qinfo->qi_ranges[1][pli].base_matrices== + _qinfo->qi_ranges[0][pli].base_matrices){ + _qinfo->qi_ranges[1][pli].base_matrices=NULL; + } + } + /*Now free all the non-duplicate storage.*/ + _ogg_free((void *)_qinfo->qi_ranges[qti][pli].sizes); + _ogg_free((void *)_qinfo->qi_ranges[qti][pli].base_matrices); + } +} |