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/********************************************************************
* *
* THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
* THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE. *
* PLEASE READ THESE TERMS DISTRIBUTING. *
* *
* THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
* by Monty <monty@xiph.org> and The XIPHOPHORUS Company *
* http://www.xiph.org/ *
* *
********************************************************************
function: residue backend 0 implementation
last mod: $Id: res0.c,v 1.5 2000/02/12 08:33:09 xiphmont Exp $
********************************************************************/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdio.h>
#include "vorbis/codec.h"
#include "bitwise.h"
#include "registry.h"
#include "scales.h"
typedef struct {
vorbis_info_residue0 *info;
int bookpointers[64];
} vorbis_look_residue0;
void free_info(vorbis_info_residue *i){
if(i){
memset(i,0,sizeof(vorbis_info_residue0));
free(i);
}
}
void free_look(vorbis_look_residue *i){
if(i){
memset(i,0,sizeof(vorbis_look_residue0));
free(i);
}
}
/* not yet */
void pack(vorbis_info_residue *vr,oggpack_buffer *opb){
vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
int j,acc=0;
_oggpack_write(opb,info->begin,24);
_oggpack_write(opb,info->end,24);
_oggpack_write(opb,info->grouping-1,24); /* residue vectors to group and
code with a partitioned book */
_oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
_oggpack_write(opb,info->groupspercode-1,6); /* partitioned group
codes to encode at
once */
_oggpack_write(opb,info->groupbook,8); /* group huffman book */
for(j=0;j<info->partitions;j++){
_oggpack_write(opb,info->secondstages[j],4); /* zero *is* a valid choice */
acc+=info->secondstages[j];
}
for(j=0;j<acc;j++)
_oggpack_write(opb,info->booklist[j],8);
}
/* vorbis_info is for range checking */
vorbis_info_residue *unpack(vorbis_info *vi,oggpack_buffer *opb){
int j,acc=0;
vorbis_info_residue0 *ret=calloc(1,sizeof(vorbis_info_residue0));
ret->begin=_oggpack_read(opb,24);
ret->end=_oggpack_read(opb,24);
ret->grouping=_oggpack_read(opb,24)+1;
ret->partitions=_oggpack_read(opb,6)+1;
ret->groupspercode=_oggpack_read(opb,6)+1;
ret->groupbook=_oggpack_read(opb,8);
for(j=0;j<ret->partitions;j++)
acc+=ret->secondstages[j]=_oggpack_read(opb,4);
for(j=0;j<acc;j++)
ret->booklist[j]=_oggpack_read(opb,8);
if(ret->groupbook>=vi->books)goto errout;
for(j=0;j<acc;j++)
if(ret->booklist[j]>=vi->books)goto errout;
return(ret);
errout:
free_info(ret);
return(NULL);
}
vorbis_look_residue *look (vorbis_info *vi,vorbis_info_mode *vm,
vorbis_info_residue *vr){
vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
vorbis_look_residue0 *look=calloc(1,sizeof(vorbis_look_residue0));
int j,acc=0;
look->info=info;
for(j=0;j<info->partitions;j++){
look->bookpointers[j]=acc;
acc+=info->secondstages[j];
}
return(look);
}
int forward(vorbis_block *vb,vorbis_look_residue *l,
double **in,int ch){
long i,j;
vorbis_look_residue0 *look=(vorbis_look_residue0 *)l;
vorbis_info_residue0 *info=look->info;
for(i=0;i<ch;i++)
for(j=0;j<vb->pcmend/2;j++)
_oggpack_write(&vb->opb,rint(in[i][j])+16,5);
return(0);
}
int inverse(vorbis_block *vb,vorbis_look_residue *l,double **in,int ch){
long i,j;
for(i=0;i<ch;i++)
for(j=0;j<vb->pcmend/2;j++)
in[i][j]*=_oggpack_read(&vb->opb,5)-16;
return(0);
}
vorbis_func_residue residue0_exportbundle={
&pack,
&unpack,
&look,
&free_info,
&free_look,
&forward,
&inverse
};
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