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media/libtheora/lib/dequant.c@b8a032363ba2 (annotated)

media/libtheora/lib/dequant.c

Thu, 22 Jan 2015 13:21:57 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Thu, 22 Jan 2015 13:21:57 +0100
branch
TOR_BUG_9701
changeset 15
b8a032363ba2
permissions
-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0 1 /********************************************************************
michael@0 2 * *
michael@0 3 * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
michael@0 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
michael@0 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
michael@0 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
michael@0 7 * *
michael@0 8 * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
michael@0 9 * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
michael@0 10 * *
michael@0 11 ********************************************************************
michael@0 12
michael@0 13 function:
michael@0 14 last mod: $Id: dequant.c 16503 2009-08-22 18:14:02Z giles $
michael@0 15
michael@0 16 ********************************************************************/
michael@0 17
michael@0 18 #include <stdlib.h>
michael@0 19 #include <string.h>
michael@0 20 #include <ogg/ogg.h>
michael@0 21 #include "dequant.h"
michael@0 22 #include "decint.h"
michael@0 23
michael@0 24 int oc_quant_params_unpack(oc_pack_buf *_opb,th_quant_info *_qinfo){
michael@0 25 th_quant_base *base_mats;
michael@0 26 long val;
michael@0 27 int nbase_mats;
michael@0 28 int sizes[64];
michael@0 29 int indices[64];
michael@0 30 int nbits;
michael@0 31 int bmi;
michael@0 32 int ci;
michael@0 33 int qti;
michael@0 34 int pli;
michael@0 35 int qri;
michael@0 36 int qi;
michael@0 37 int i;
michael@0 38 val=oc_pack_read(_opb,3);
michael@0 39 nbits=(int)val;
michael@0 40 for(qi=0;qi<64;qi++){
michael@0 41 val=oc_pack_read(_opb,nbits);
michael@0 42 _qinfo->loop_filter_limits[qi]=(unsigned char)val;
michael@0 43 }
michael@0 44 val=oc_pack_read(_opb,4);
michael@0 45 nbits=(int)val+1;
michael@0 46 for(qi=0;qi<64;qi++){
michael@0 47 val=oc_pack_read(_opb,nbits);
michael@0 48 _qinfo->ac_scale[qi]=(ogg_uint16_t)val;
michael@0 49 }
michael@0 50 val=oc_pack_read(_opb,4);
michael@0 51 nbits=(int)val+1;
michael@0 52 for(qi=0;qi<64;qi++){
michael@0 53 val=oc_pack_read(_opb,nbits);
michael@0 54 _qinfo->dc_scale[qi]=(ogg_uint16_t)val;
michael@0 55 }
michael@0 56 val=oc_pack_read(_opb,9);
michael@0 57 nbase_mats=(int)val+1;
michael@0 58 base_mats=_ogg_malloc(nbase_mats*sizeof(base_mats[0]));
michael@0 59 if(base_mats==NULL)return TH_EFAULT;
michael@0 60 for(bmi=0;bmi<nbase_mats;bmi++){
michael@0 61 for(ci=0;ci<64;ci++){
michael@0 62 val=oc_pack_read(_opb,8);
michael@0 63 base_mats[bmi][ci]=(unsigned char)val;
michael@0 64 }
michael@0 65 }
michael@0 66 nbits=oc_ilog(nbase_mats-1);
michael@0 67 for(i=0;i<6;i++){
michael@0 68 th_quant_ranges *qranges;
michael@0 69 th_quant_base *qrbms;
michael@0 70 int *qrsizes;
michael@0 71 qti=i/3;
michael@0 72 pli=i%3;
michael@0 73 qranges=_qinfo->qi_ranges[qti]+pli;
michael@0 74 if(i>0){
michael@0 75 val=oc_pack_read1(_opb);
michael@0 76 if(!val){
michael@0 77 int qtj;
michael@0 78 int plj;
michael@0 79 if(qti>0){
michael@0 80 val=oc_pack_read1(_opb);
michael@0 81 if(val){
michael@0 82 qtj=qti-1;
michael@0 83 plj=pli;
michael@0 84 }
michael@0 85 else{
michael@0 86 qtj=(i-1)/3;
michael@0 87 plj=(i-1)%3;
michael@0 88 }
michael@0 89 }
michael@0 90 else{
michael@0 91 qtj=(i-1)/3;
michael@0 92 plj=(i-1)%3;
michael@0 93 }
michael@0 94 *qranges=*(_qinfo->qi_ranges[qtj]+plj);
michael@0 95 continue;
michael@0 96 }
michael@0 97 }
michael@0 98 val=oc_pack_read(_opb,nbits);
michael@0 99 indices[0]=(int)val;
michael@0 100 for(qi=qri=0;qi<63;){
michael@0 101 val=oc_pack_read(_opb,oc_ilog(62-qi));
michael@0 102 sizes[qri]=(int)val+1;
michael@0 103 qi+=(int)val+1;
michael@0 104 val=oc_pack_read(_opb,nbits);
michael@0 105 indices[++qri]=(int)val;
michael@0 106 }
michael@0 107 /*Note: The caller is responsible for cleaning up any partially
michael@0 108 constructed qinfo.*/
michael@0 109 if(qi>63){
michael@0 110 _ogg_free(base_mats);
michael@0 111 return TH_EBADHEADER;
michael@0 112 }
michael@0 113 qranges->nranges=qri;
michael@0 114 qranges->sizes=qrsizes=(int *)_ogg_malloc(qri*sizeof(qrsizes[0]));
michael@0 115 if(qranges->sizes==NULL){
michael@0 116 /*Note: The caller is responsible for cleaning up any partially
michael@0 117 constructed qinfo.*/
michael@0 118 _ogg_free(base_mats);
michael@0 119 return TH_EFAULT;
michael@0 120 }
michael@0 121 memcpy(qrsizes,sizes,qri*sizeof(qrsizes[0]));
michael@0 122 qrbms=(th_quant_base *)_ogg_malloc((qri+1)*sizeof(qrbms[0]));
michael@0 123 if(qrbms==NULL){
michael@0 124 /*Note: The caller is responsible for cleaning up any partially
michael@0 125 constructed qinfo.*/
michael@0 126 _ogg_free(base_mats);
michael@0 127 return TH_EFAULT;
michael@0 128 }
michael@0 129 qranges->base_matrices=(const th_quant_base *)qrbms;
michael@0 130 do{
michael@0 131 bmi=indices[qri];
michael@0 132 /*Note: The caller is responsible for cleaning up any partially
michael@0 133 constructed qinfo.*/
michael@0 134 if(bmi>=nbase_mats){
michael@0 135 _ogg_free(base_mats);
michael@0 136 return TH_EBADHEADER;
michael@0 137 }
michael@0 138 memcpy(qrbms[qri],base_mats[bmi],sizeof(qrbms[qri]));
michael@0 139 }
michael@0 140 while(qri-->0);
michael@0 141 }
michael@0 142 _ogg_free(base_mats);
michael@0 143 return 0;
michael@0 144 }
michael@0 145
michael@0 146 void oc_quant_params_clear(th_quant_info *_qinfo){
michael@0 147 int i;
michael@0 148 for(i=6;i-->0;){
michael@0 149 int qti;
michael@0 150 int pli;
michael@0 151 qti=i/3;
michael@0 152 pli=i%3;
michael@0 153 /*Clear any duplicate pointer references.*/
michael@0 154 if(i>0){
michael@0 155 int qtj;
michael@0 156 int plj;
michael@0 157 qtj=(i-1)/3;
michael@0 158 plj=(i-1)%3;
michael@0 159 if(_qinfo->qi_ranges[qti][pli].sizes==
michael@0 160 _qinfo->qi_ranges[qtj][plj].sizes){
michael@0 161 _qinfo->qi_ranges[qti][pli].sizes=NULL;
michael@0 162 }
michael@0 163 if(_qinfo->qi_ranges[qti][pli].base_matrices==
michael@0 164 _qinfo->qi_ranges[qtj][plj].base_matrices){
michael@0 165 _qinfo->qi_ranges[qti][pli].base_matrices=NULL;
michael@0 166 }
michael@0 167 }
michael@0 168 if(qti>0){
michael@0 169 if(_qinfo->qi_ranges[1][pli].sizes==
michael@0 170 _qinfo->qi_ranges[0][pli].sizes){
michael@0 171 _qinfo->qi_ranges[1][pli].sizes=NULL;
michael@0 172 }
michael@0 173 if(_qinfo->qi_ranges[1][pli].base_matrices==
michael@0 174 _qinfo->qi_ranges[0][pli].base_matrices){
michael@0 175 _qinfo->qi_ranges[1][pli].base_matrices=NULL;
michael@0 176 }
michael@0 177 }
michael@0 178 /*Now free all the non-duplicate storage.*/
michael@0 179 _ogg_free((void *)_qinfo->qi_ranges[qti][pli].sizes);
michael@0 180 _ogg_free((void *)_qinfo->qi_ranges[qti][pli].base_matrices);
michael@0 181 }
michael@0 182 }

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