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-rw-r--r--media/libtheora/lib/dequant.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/media/libtheora/lib/dequant.c b/media/libtheora/lib/dequant.c
new file mode 100644
index 0000000000..860536f72d
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+++ b/media/libtheora/lib/dequant.c
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+/********************************************************************
+ * *
+ * 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: $Id$
+
+ ********************************************************************/
+
+#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);
+ }
+}