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450 lines
9.8 KiB
450 lines
9.8 KiB
/* MPEG/WAVE Sound library
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(C) 1997 by Jung woo-jae */
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// Mpeglayer2.cc
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// It's for MPEG Layer 2
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#include "mpegsound.h"
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#include "synthesis.h"
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#include <iostream>
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using namespace std;
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#define BUGFIX
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#include "mpeg2tables.h"
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// workaround for buggy mpeg2 streams.
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// tested with 12 monkey cdi, worgked fine.
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// problem was: the stream produced ints
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// with access out of the tables
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// if we have such an access we set it to a zero entry
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#ifdef BUGFIX
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static int checkCodeRange(int code,const REAL* group) {
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int back=0;
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if (group == NULL) {
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cout << "group null"<<endl;
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return 0;
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}
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back=code;
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if (group == group5bits) {
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if (back > 27*3) {
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// redirect to zero value
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back=3;
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}
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return back;
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}
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if (group == group7bits) {
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if (back > 125*3) {
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back=6;
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}
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return back;
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}
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if (group == group10bits) {
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if (back > 729*3) {
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back=12;
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}
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return back;
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}
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DEBUG_LAYER(cout << "unknown group found!"<<endl;)
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return -1;
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}
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#endif
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// Mpeg layer 2
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void Mpegtoraw::extractlayer2(void) {
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int inputstereo=mpegAudioHeader->getInputstereo();
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int tableindex=mpegAudioHeader->getTableindex();
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int subbandnumber=mpegAudioHeader->getSubbandnumber();
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int stereobound=mpegAudioHeader->getStereobound();
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REAL fraction[MAXCHANNEL][3][MAXSUBBAND];
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unsigned int bitalloc[MAXCHANNEL][MAXSUBBAND],
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scaleselector[MAXCHANNEL][MAXSUBBAND];
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REAL scalefactor[2][3][MAXSUBBAND];
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const REAL *group[MAXCHANNEL][MAXSUBBAND];
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unsigned int codelength[MAXCHANNEL][MAXSUBBAND];
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REAL factor[MAXCHANNEL][MAXSUBBAND];
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REAL c[MAXCHANNEL][MAXSUBBAND],d[MAXCHANNEL][MAXSUBBAND];
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int s=stereobound,n=subbandnumber;
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// Bitalloc
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{
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register int i;
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register const int *t=bitalloclengthtable[tableindex];
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for(i=0;i<s;i++,t++)
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{
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bitalloc[LS][i]=getbits(*t);
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bitalloc[RS][i]=getbits(*t);
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}
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for(;i<n;i++,t++) {
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bitalloc[LS][i]=bitalloc[RS][i]=getbits(*t);
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}
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}
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// Scale selector
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if(inputstereo)
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for(register int i=0;i<n;i++)
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{
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if(bitalloc[LS][i])scaleselector[LS][i]=getbits(2);
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if(bitalloc[RS][i])scaleselector[RS][i]=getbits(2);
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}
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else
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for(register int i=0;i<n;i++)
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if(bitalloc[LS][i])scaleselector[LS][i]=getbits(2);
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// Scale index
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{
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register int i,j;
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for(i=0;i<n;i++)
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{
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if((j=bitalloc[LS][i]))
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{
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if(!tableindex)
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{
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group[LS][i]=grouptableA[j];
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codelength[LS][i]=codelengthtableA[j];
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factor[LS][i]=factortableA[j];
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c[LS][i]=ctableA[j];
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d[LS][i]=dtableA[j];
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}
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else
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{
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if(i<=2)
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{
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group[LS][i]=grouptableB1[j];
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codelength[LS][i]=codelengthtableB1[j];
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factor[LS][i]=factortableB1[j];
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c[LS][i]=ctableB1[j];
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d[LS][i]=dtableB1[j];
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}
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else
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{
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group[LS][i]=grouptableB234[j];
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if(i<=10)
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{
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codelength[LS][i]=codelengthtableB2[j];
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factor[LS][i]=factortableB2[j];
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c[LS][i]=ctableB2[j];
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d[LS][i]=dtableB2[j];
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}
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else if(i<=22)
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{
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codelength[LS][i]=codelengthtableB3[j];
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factor[LS][i]=factortableB3[j];
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c[LS][i]=ctableB3[j];
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d[LS][i]=dtableB3[j];
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}
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else
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{
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codelength[LS][i]=codelengthtableB4[j];
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factor[LS][i]=factortableB4[j];
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c[LS][i]=ctableB4[j];
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d[LS][i]=dtableB4[j];
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}
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}
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}
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switch(scaleselector[LS][i])
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{
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case 0:scalefactor[LS][0][i]=scalefactorstable[getbits(6)];
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scalefactor[LS][1][i]=scalefactorstable[getbits(6)];
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scalefactor[LS][2][i]=scalefactorstable[getbits(6)];
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break;
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case 1:scalefactor[LS][0][i]=
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scalefactor[LS][1][i]=scalefactorstable[getbits(6)];
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scalefactor[LS][2][i]=scalefactorstable[getbits(6)];
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break;
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case 2:scalefactor[LS][0][i]=
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scalefactor[LS][1][i]=
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scalefactor[LS][2][i]=scalefactorstable[getbits(6)];
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break;
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case 3:scalefactor[LS][0][i]=scalefactorstable[getbits(6)];
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scalefactor[LS][1][i]=
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scalefactor[LS][2][i]=scalefactorstable[getbits(6)];
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break;
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default:
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cout << "scaleselector left default never happens"<<endl;
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break;
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}
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}
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if(inputstereo && (j=bitalloc[RS][i]))
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{
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if(!tableindex)
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{
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group[RS][i]=grouptableA[j];
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codelength[RS][i]=codelengthtableA[j];
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factor[RS][i]=factortableA[j];
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c[RS][i]=ctableA[j];
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d[RS][i]=dtableA[j];
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}
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else
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{
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if(i<=2)
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{
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group[RS][i]=grouptableB1[j];
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codelength[RS][i]=codelengthtableB1[j];
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factor[RS][i]=factortableB1[j];
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c[RS][i]=ctableB1[j];
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d[RS][i]=dtableB1[j];
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}
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else
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{
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group[RS][i]=grouptableB234[j];
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if(i<=10)
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{
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codelength[RS][i]=codelengthtableB2[j];
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factor[RS][i]=factortableB2[j];
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c[RS][i]=ctableB2[j];
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d[RS][i]=dtableB2[j];
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}
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else if(i<=22)
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{
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codelength[RS][i]=codelengthtableB3[j];
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factor[RS][i]=factortableB3[j];
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c[RS][i]=ctableB3[j];
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d[RS][i]=dtableB3[j];
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}
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else
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{
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codelength[RS][i]=codelengthtableB4[j];
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factor[RS][i]=factortableB4[j];
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c[RS][i]=ctableB4[j];
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d[RS][i]=dtableB4[j];
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}
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}
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}
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switch(scaleselector[RS][i])
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{
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case 0 : scalefactor[RS][0][i]=scalefactorstable[getbits(6)];
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scalefactor[RS][1][i]=scalefactorstable[getbits(6)];
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scalefactor[RS][2][i]=scalefactorstable[getbits(6)];
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break;
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case 1 : scalefactor[RS][0][i]=
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scalefactor[RS][1][i]=scalefactorstable[getbits(6)];
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scalefactor[RS][2][i]=scalefactorstable[getbits(6)];
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break;
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case 2 : scalefactor[RS][0][i]=
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scalefactor[RS][1][i]=
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scalefactor[RS][2][i]=scalefactorstable[getbits(6)];
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break;
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case 3 : scalefactor[RS][0][i]=scalefactorstable[getbits(6)];
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scalefactor[RS][1][i]=
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scalefactor[RS][2][i]=scalefactorstable[getbits(6)];
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break;
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default:
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cout << "scaleselector right default never happens"<<endl;
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break;
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}
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}
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}
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}
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// Read Sample
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{
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register int i;
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for(int l=0;l<SCALEBLOCK;l++)
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{
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// Read Sample
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for(i=0;i<s;i++)
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{
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if(bitalloc[LS][i])
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{
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if(group[LS][i])
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{
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register const REAL *s;
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int code=getbits(codelength[LS][i]);
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code+=code<<1;
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#ifdef BUGFIX
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// bugfix for bad streams
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code=checkCodeRange(code,group[LS][i]);
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if (code == -1) return;
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#endif
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s=group[LS][i]+code;
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fraction[LS][0][i]=s[0];
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fraction[LS][1][i]=s[1];
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fraction[LS][2][i]=s[2];
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}
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else
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{
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fraction[LS][0][i]=
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REAL(getbits(codelength[LS][i]))*factor[LS][i]-1.0;
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fraction[LS][1][i]=
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REAL(getbits(codelength[LS][i]))*factor[LS][i]-1.0;
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fraction[LS][2][i]=
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REAL(getbits(codelength[LS][i]))*factor[LS][i]-1.0;
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}
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}
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else fraction[LS][0][i]=fraction[LS][1][i]=fraction[LS][2][i]=0.0;
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if(inputstereo && bitalloc[RS][i])
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{
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if(group[RS][i])
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{
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const REAL *s;
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int code=getbits(codelength[RS][i]);
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code+=code<<1;
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#ifdef BUGFIX
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// bugfix for bad streams
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code=checkCodeRange(code,group[RS][i]);
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if (code == -1) return;
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#endif
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s=group[RS][i]+code;
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fraction[RS][0][i]=s[0];
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fraction[RS][1][i]=s[1];
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fraction[RS][2][i]=s[2];
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}
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else
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{
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fraction[RS][0][i]=
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REAL(getbits(codelength[RS][i]))*factor[RS][i]-1.0;
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fraction[RS][1][i]=
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REAL(getbits(codelength[RS][i]))*factor[RS][i]-1.0;
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fraction[RS][2][i]=
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REAL(getbits(codelength[RS][i]))*factor[RS][i]-1.0;
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}
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}
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else fraction[RS][0][i]=fraction[RS][1][i]=fraction[RS][2][i]=0.0;
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}
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for(;i<n;i++)
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{
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if(bitalloc[LS][i])
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{
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if(group[LS][i])
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{
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register const REAL *s;
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int code=getbits(codelength[LS][i]);
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code+=code<<1;
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#ifdef BUGFIX
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// bugfix for bad streams
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code=checkCodeRange(code,group[LS][i]);
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if (code == -1) return;
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#endif
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s=group[LS][i]+code;
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fraction[LS][0][i]=fraction[RS][0][i]=s[0];
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fraction[LS][1][i]=fraction[RS][1][i]=s[1];
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fraction[LS][2][i]=fraction[RS][2][i]=s[2];
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}
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else
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{
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fraction[LS][0][i]=fraction[RS][0][i]=
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REAL(getbits(codelength[LS][i]))*factor[LS][i]-1.0;
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fraction[LS][1][i]=fraction[RS][1][i]=
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REAL(getbits(codelength[LS][i]))*factor[LS][i]-1.0;
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fraction[LS][2][i]=fraction[RS][2][i]=
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REAL(getbits(codelength[LS][i]))*factor[LS][i]-1.0;
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}
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}
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else fraction[LS][0][i]=fraction[LS][1][i]=fraction[LS][2][i]=
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fraction[RS][0][i]=fraction[RS][1][i]=fraction[RS][2][i]=0.0;
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}
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//Fraction
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if(lOutputStereo)
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for(i=0;i<n;i++)
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{
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if(bitalloc[LS][i])
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{
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if(!group[LS][i])
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{
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fraction[LS][0][i]=(fraction[LS][0][i]+d[LS][i])*c[LS][i];
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fraction[LS][1][i]=(fraction[LS][1][i]+d[LS][i])*c[LS][i];
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fraction[LS][2][i]=(fraction[LS][2][i]+d[LS][i])*c[LS][i];
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}
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register REAL t=scalefactor[LS][l>>2][i];
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fraction[LS][0][i]*=t;
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fraction[LS][1][i]*=t;
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fraction[LS][2][i]*=t;
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}
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if(bitalloc[RS][i])
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{
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if(!group[RS][i])
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{
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fraction[RS][0][i]=(fraction[RS][0][i]+d[RS][i])*c[LS][i];
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fraction[RS][1][i]=(fraction[RS][1][i]+d[RS][i])*c[LS][i];
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fraction[RS][2][i]=(fraction[RS][2][i]+d[RS][i])*c[LS][i];
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}
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register REAL t=scalefactor[RS][l>>2][i];
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fraction[RS][0][i]*=t;
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fraction[RS][1][i]*=t;
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fraction[RS][2][i]*=t;
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}
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}
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else
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for(i=0;i<n;i++)
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if(bitalloc[LS][i])
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{
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if(!group[LS][i])
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{
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fraction[LS][0][i]=(fraction[LS][0][i]+d[LS][i])*c[LS][i];
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fraction[LS][1][i]=(fraction[LS][1][i]+d[LS][i])*c[LS][i];
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fraction[LS][2][i]=(fraction[LS][2][i]+d[LS][i])*c[LS][i];
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}
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register REAL t=scalefactor[LS][l>>2][i];
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fraction[LS][0][i]*=t;
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fraction[LS][1][i]*=t;
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fraction[LS][2][i]*=t;
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}
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for(;i<MAXSUBBAND;i++)
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fraction[LS][0][i]=fraction[LS][1][i]=fraction[LS][2][i]=
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fraction[RS][0][i]=fraction[RS][1][i]=fraction[RS][2][i]=0.0;
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for(i=0;i<3;i++) {
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synthesis->doSynth(lDownSample,lOutputStereo,
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fraction[LS][i],fraction[RS][i]);
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}
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}
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}
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}
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