2aa511f6bd
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28773 a1c6a512-1295-4272-9138-f99709370657
374 lines
11 KiB
C
374 lines
11 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
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* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: residue backend 0, 1 and 2 implementation
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********************************************************************/
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#include "config-tremor.h"
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#include <string.h>
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#include <math.h>
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#include "ogg.h"
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#include "ivorbiscodec.h"
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#include "codec_internal.h"
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#include "registry.h"
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#include "codebook.h"
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#include "misc.h"
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#include "os.h"
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typedef struct {
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vorbis_info_residue0 *info;
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int map;
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int parts;
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int stages;
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codebook *fullbooks;
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codebook *phrasebook;
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codebook ***partbooks;
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int partvals;
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int **decodemap;
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} vorbis_look_residue0;
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static void res0_free_info(vorbis_info_residue *i){
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vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
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if(info){
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memset(info,0,sizeof(*info));
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_ogg_free(info);
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}
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}
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static void res0_free_look(vorbis_look_residue *i){
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int j;
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if(i){
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vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
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for(j=0;j<look->parts;j++)
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if(look->partbooks[j])_ogg_free(look->partbooks[j]);
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_ogg_free(look->partbooks);
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for(j=0;j<look->partvals;j++)
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_ogg_free(look->decodemap[j]);
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_ogg_free(look->decodemap);
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memset(look,0,sizeof(*look));
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_ogg_free(look);
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}
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}
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static int ilog(unsigned int v){
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int ret=0;
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while(v){
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ret++;
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v>>=1;
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}
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return(ret);
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}
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static int icount(unsigned int v){
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int ret=0;
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while(v){
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ret+=v&1;
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v>>=1;
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}
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return(ret);
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}
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/* vorbis_info is for range checking */
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static vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
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int j,acc=0;
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vorbis_info_residue0 *info=(vorbis_info_residue0 *)_ogg_calloc(1,sizeof(*info));
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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info->begin=oggpack_read(opb,24);
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info->end=oggpack_read(opb,24);
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info->grouping=oggpack_read(opb,24)+1;
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info->partitions=oggpack_read(opb,6)+1;
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info->groupbook=oggpack_read(opb,8);
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/* check for premature EOP */
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if(info->groupbook<0)goto errout;
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for(j=0;j<info->partitions;j++){
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int cascade=oggpack_read(opb,3);
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int cflag=oggpack_read(opb,1);
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if(cflag<0) goto errout;
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if(cflag){
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int c=oggpack_read(opb,5);
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if(c<0) goto errout;
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cascade|=(c<<3);
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}
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info->secondstages[j]=cascade;
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acc+=icount(cascade);
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}
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for(j=0;j<acc;j++){
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int book=oggpack_read(opb,8);
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if(book<0) goto errout;
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info->booklist[j]=book;
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}
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if(info->groupbook>=ci->books)goto errout;
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for(j=0;j<acc;j++){
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if(info->booklist[j]>=ci->books)goto errout;
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if(ci->book_param[info->booklist[j]]->maptype==0)goto errout;
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}
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/* verify the phrasebook is not specifying an impossible or
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inconsistent partitioning scheme. */
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/* modify the phrasebook ranging check from r16327; an early beta
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encoder had a bug where it used an oversized phrasebook by
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accident. These files should continue to be playable, but don't
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allow an exploit */
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{
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int entries = ci->book_param[info->groupbook]->entries;
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int dim = ci->book_param[info->groupbook]->dim;
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int partvals = 1;
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if (dim<1) goto errout;
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while(dim>0){
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partvals *= info->partitions;
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if(partvals > entries) goto errout;
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dim--;
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}
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info->partvals = partvals;
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}
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return(info);
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errout:
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res0_free_info(info);
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return(NULL);
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}
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static vorbis_look_residue *res0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm,
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vorbis_info_residue *vr){
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vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
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vorbis_look_residue0 *look=(vorbis_look_residue0 *)_ogg_calloc(1,sizeof(*look));
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codec_setup_info *ci=(codec_setup_info *)vd->vi->codec_setup;
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int j,k,acc=0;
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int dim;
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int maxstage=0;
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look->info=info;
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look->map=vm->mapping;
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look->parts=info->partitions;
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look->fullbooks=ci->fullbooks;
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look->phrasebook=ci->fullbooks+info->groupbook;
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dim=look->phrasebook->dim;
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look->partbooks=(codebook ***)_ogg_calloc(look->parts,sizeof(*look->partbooks));
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for(j=0;j<look->parts;j++){
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int stages=ilog(info->secondstages[j]);
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if(stages){
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if(stages>maxstage)maxstage=stages;
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look->partbooks[j]=(codebook **)_ogg_calloc(stages,sizeof(*look->partbooks[j]));
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for(k=0;k<stages;k++)
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if(info->secondstages[j]&(1<<k)){
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look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
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#ifdef TRAIN_RES
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look->training_data[k][j]=calloc(look->partbooks[j][k]->entries,
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sizeof(***look->training_data));
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#endif
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}
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}
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}
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look->partvals=look->parts;
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for(j=1;j<dim;j++)look->partvals*=look->parts;
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look->stages=maxstage;
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look->decodemap=(int **)_ogg_malloc(look->partvals*sizeof(*look->decodemap));
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for(j=0;j<look->partvals;j++){
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long val=j;
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long mult=look->partvals/look->parts;
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look->decodemap[j]=(int *)_ogg_malloc(dim*sizeof(*look->decodemap[j]));
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for(k=0;k<dim;k++){
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long deco=val/mult;
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val-=deco*mult;
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mult/=look->parts;
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look->decodemap[j][k]=deco;
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}
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}
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return(look);
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}
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/* a truncated packet here just means 'stop working'; it's not an error */
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static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
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ogg_int32_t **in,int ch,
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long (*decodepart)(codebook *, ogg_int32_t *,
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oggpack_buffer *,int,int)){
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long i,j,k,l,s;
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vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
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vorbis_info_residue0 *info=look->info;
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/* move all this setup out later */
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int samples_per_partition=info->grouping;
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int partitions_per_word=look->phrasebook->dim;
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int max=vb->pcmend>>1;
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int end=(info->end<max?info->end:max);
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int n=end-info->begin;
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if(n>0){
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int partvals=n/samples_per_partition;
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int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
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int ***partword=(int ***)alloca(ch*sizeof(*partword));
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for(j=0;j<ch;j++)
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partword[j]=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
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for(s=0;s<look->stages;s++){
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/* each loop decodes on partition codeword containing
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partitions_pre_word partitions */
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for(i=0,l=0;i<partvals;l++){
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if(s==0){
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/* fetch the partition word for each channel */
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for(j=0;j<ch;j++){
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int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
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if(temp==-1 || temp>=info->partvals)goto eopbreak;
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partword[j][l]=look->decodemap[temp];
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if(partword[j][l]==NULL)goto errout;
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}
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}
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/* now we decode residual values for the partitions */
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for(k=0;k<partitions_per_word && i<partvals;k++,i++)
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for(j=0;j<ch;j++){
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long offset=info->begin+i*samples_per_partition;
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if(info->secondstages[partword[j][l][k]]&(1<<s)){
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codebook *stagebook=look->partbooks[partword[j][l][k]][s];
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if(stagebook){
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if(decodepart(stagebook,in[j]+offset,&vb->opb,
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samples_per_partition,-8)==-1)goto eopbreak;
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}
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}
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}
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}
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}
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}
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errout:
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eopbreak:
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return(0);
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}
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static int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
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ogg_int32_t **in,int *nonzero,int ch){
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int i,used=0;
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for(i=0;i<ch;i++)
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if(nonzero[i])
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in[used++]=in[i];
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if(used)
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return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
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else
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return(0);
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}
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static int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
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ogg_int32_t **in,int *nonzero,int ch){
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int i,used=0;
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for(i=0;i<ch;i++)
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if(nonzero[i])
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in[used++]=in[i];
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if(used)
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return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
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else
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return(0);
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}
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/* duplicate code here as speed is somewhat more important */
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int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
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ogg_int32_t **in,int *nonzero,int ch)
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ICODE_ATTR_TREMOR_NOT_MDCT;
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int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
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ogg_int32_t **in,int *nonzero,int ch){
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long i,k,l,s;
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vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
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vorbis_info_residue0 *info=look->info;
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/* move all this setup out later */
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int samples_per_partition=info->grouping;
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int partitions_per_word=look->phrasebook->dim;
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int max=(vb->pcmend*ch)>>1;
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int end=(info->end<max?info->end:max);
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int n=end-info->begin;
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if(n>0){
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int partvals=n/samples_per_partition;
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int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
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int **partword=(int **)_vorbis_block_alloc(vb,partwords*sizeof(*partword));
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int beginoff=info->begin/ch;
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for(i=0;i<ch;i++)if(nonzero[i])break;
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if(i==ch)return(0); /* no nonzero vectors */
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samples_per_partition/=ch;
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for(s=0;s<look->stages;s++){
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for(i=0,l=0;i<partvals;l++){
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if(s==0){
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/* fetch the partition word */
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int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
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if(temp==-1 || temp>=info->partvals)goto eopbreak;
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partword[l]=look->decodemap[temp];
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if(partword[l]==NULL)goto errout;
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}
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/* now we decode residual values for the partitions */
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for(k=0;k<partitions_per_word && i<partvals;k++,i++)
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if(info->secondstages[partword[l][k]]&(1<<s)){
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codebook *stagebook=look->partbooks[partword[l][k]][s];
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if(stagebook){
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if(vorbis_book_decodevv_add(stagebook,in,
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i*samples_per_partition+beginoff,ch,
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&vb->opb,
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samples_per_partition,-8)==-1)
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goto eopbreak;
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}
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}
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}
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}
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}
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errout:
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eopbreak:
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return(0);
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}
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const vorbis_func_residue residue0_exportbundle ICONST_ATTR ={
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&res0_unpack,
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&res0_look,
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&res0_free_info,
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&res0_free_look,
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&res0_inverse
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};
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const vorbis_func_residue residue1_exportbundle ICONST_ATTR ={
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&res0_unpack,
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&res0_look,
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&res0_free_info,
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&res0_free_look,
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&res1_inverse
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};
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const vorbis_func_residue residue2_exportbundle ICONST_ATTR ={
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&res0_unpack,
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&res0_look,
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&res0_free_info,
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&res0_free_look,
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&res2_inverse
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};
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