mirror of
https://github.com/smallmain/cocos-enhance-kit.git
synced 2025-01-14 23:11:06 +00:00
226 lines
6.5 KiB
C
Executable File
226 lines
6.5 KiB
C
Executable File
/********************************************************************
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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 1994-2003 *
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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 <stdlib.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 "codebook.h"
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#include "misc.h"
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#include "os.h"
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void res_clear_info(vorbis_info_residue *info){
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if(info){
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if(info->stagemasks)_ogg_free(info->stagemasks);
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if(info->stagebooks)_ogg_free(info->stagebooks);
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memset(info,0,sizeof(*info));
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}
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}
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/* vorbis_info is for range checking */
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int res_unpack(vorbis_info_residue *info,
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vorbis_info *vi,oggpack_buffer *opb){
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int j,k;
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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memset(info,0,sizeof(*info));
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info->type=oggpack_read(opb,16);
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if(info->type>2 || info->type<0)goto errout;
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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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if(info->groupbook>=ci->books)goto errout;
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info->stagemasks=_ogg_malloc(info->partitions*sizeof(*info->stagemasks));
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info->stagebooks=_ogg_malloc(info->partitions*8*sizeof(*info->stagebooks));
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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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if(oggpack_read(opb,1))
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cascade|=(oggpack_read(opb,5)<<3);
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info->stagemasks[j]=cascade;
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}
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for(j=0;j<info->partitions;j++){
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for(k=0;k<8;k++){
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if((info->stagemasks[j]>>k)&1){
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unsigned char book=oggpack_read(opb,8);
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if(book>=ci->books)goto errout;
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info->stagebooks[j*8+k]=book;
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if(k+1>info->stages)info->stages=k+1;
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}else
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info->stagebooks[j*8+k]=0xff;
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}
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}
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if(oggpack_eop(opb))goto errout;
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return 0;
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errout:
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res_clear_info(info);
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return 1;
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}
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int res_inverse(vorbis_dsp_state *vd,vorbis_info_residue *info,
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ogg_int32_t **in,int *nonzero,int ch){
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int i,j,k,s,used=0;
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codec_setup_info *ci=(codec_setup_info *)vd->vi->codec_setup;
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codebook *phrasebook=ci->book_param+info->groupbook;
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int samples_per_partition=info->grouping;
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int partitions_per_word=phrasebook->dim;
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int pcmend=ci->blocksizes[vd->W];
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if(info->type<2){
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int max=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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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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ch=used;
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if(used){
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char **partword=(char **)alloca(ch*sizeof(*partword));
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for(j=0;j<ch;j++)
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partword[j]=(char *)alloca(partwords*partitions_per_word*
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sizeof(*partword[j]));
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for(s=0;s<info->stages;s++){
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for(i=0;i<partvals;){
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if(s==0){
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/* fetch the partition word for each channel */
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partword[0][i+partitions_per_word-1]=1;
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for(k=partitions_per_word-2;k>=0;k--)
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partword[0][i+k]=partword[0][i+k+1]*info->partitions;
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for(j=1;j<ch;j++)
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for(k=partitions_per_word-1;k>=0;k--)
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partword[j][i+k]=partword[j-1][i+k];
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for(j=0;j<ch;j++){
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int temp=vorbis_book_decode(phrasebook,&vd->opb);
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if(temp==-1)goto eopbreak;
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/* this can be done quickly in assembly due to the quotient
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always being at most six bits */
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for(k=0;k<partitions_per_word;k++){
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ogg_uint32_t div=partword[j][i+k];
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partword[j][i+k]=temp/div;
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temp-=partword[j][i+k]*div;
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}
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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->stagemasks[(int)partword[j][i]]&(1<<s)){
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codebook *stagebook=ci->book_param+
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info->stagebooks[(partword[j][i]<<3)+s];
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if(info->type){
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if(vorbis_book_decodev_add(stagebook,in[j]+offset,&vd->opb,
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samples_per_partition,-8)==-1)
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goto eopbreak;
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}else{
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if(vorbis_book_decodevs_add(stagebook,in[j]+offset,&vd->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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}
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}
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}else{
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int max=(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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char *partword=
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(char *)alloca(partwords*partitions_per_word*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<info->stages;s++){
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for(i=0;i<partvals;){
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if(s==0){
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int temp;
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partword[i+partitions_per_word-1]=1;
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for(k=partitions_per_word-2;k>=0;k--)
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partword[i+k]=partword[i+k+1]*info->partitions;
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/* fetch the partition word */
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temp=vorbis_book_decode(phrasebook,&vd->opb);
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if(temp==-1)goto eopbreak;
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/* this can be done quickly in assembly due to the quotient
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always being at most six bits */
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for(k=0;k<partitions_per_word;k++){
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ogg_uint32_t div=partword[i+k];
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partword[i+k]=temp/div;
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temp-=partword[i+k]*div;
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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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if(info->stagemasks[(int)partword[i]]&(1<<s)){
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codebook *stagebook=ci->book_param+
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info->stagebooks[(partword[i]<<3)+s];
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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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&vd->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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