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1 /********************************************************************
2  *                                                                  *
3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
7  *                                                                  *
8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002             *
9  * by the XIPHOPHORUS Company http://www.xiph.org/                  *
10  *                                                                  *
11  ********************************************************************
12
13  function: residue backend 0, 1 and 2 implementation
14  last mod: $Id: res0.c,v 1.49 2003/01/18 08:28:37 xiphmont Exp $
15
16  ********************************************************************/
17
18 /* Slow, slow, slow, simpleminded and did I mention it was slow?  The
19    encode/decode loops are coded for clarity and performance is not
20    yet even a nagging little idea lurking in the shadows.  Oh and BTW,
21    it's slow. */
22
23 #include <stdlib.h>
24 #include <string.h>
25 #include <math.h>
26 #include <ogg/ogg.h>
27 #include "vorbis/codec.h"
28 #include "codec_internal.h"
29 #include "registry.h"
30 #include "codebook.h"
31 #include "misc.h"
32 #include "os.h"
33
34 #ifdef TRAIN_RES
35 #include <stdio.h>
36 #endif 
37
38 typedef struct {
39   vorbis_info_residue0 *info;
40   
41   int         parts;
42   int         stages;
43   codebook   *fullbooks;
44   codebook   *phrasebook;
45   codebook ***partbooks;
46
47   int         partvals;
48   int       **decodemap;
49
50   long      postbits;
51   long      phrasebits;
52   long      frames;
53
54 #ifdef TRAIN_RES
55   int        train_seq;
56   long      *training_data[8][64];
57   float      training_max[8][64];
58   float      training_min[8][64];
59   float     tmin;
60   float     tmax;
61 #endif
62
63 } vorbis_look_residue0;
64
65 void res0_free_info(vorbis_info_residue *i){
66   vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
67   if(info){
68     memset(info,0,sizeof(*info));
69     _ogg_free(info);
70   }
71 }
72
73 void res0_free_look(vorbis_look_residue *i){
74   int j;
75   if(i){
76
77     vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
78
79 #ifdef TRAIN_RES
80     {
81       int j,k,l;
82       for(j=0;j<look->parts;j++){
83         /*fprintf(stderr,"partition %d: ",j);*/
84         for(k=0;k<8;k++)
85           if(look->training_data[k][j]){
86             char buffer[80];
87             FILE *of;
88             codebook *statebook=look->partbooks[j][k];
89             
90             /* long and short into the same bucket by current convention */
91             sprintf(buffer,"res_part%d_pass%d.vqd",j,k);
92             of=fopen(buffer,"a");
93
94             for(l=0;l<statebook->entries;l++)
95               fprintf(of,"%d:%ld\n",l,look->training_data[k][j][l]);
96             
97             fclose(of);
98             
99             /*fprintf(stderr,"%d(%.2f|%.2f) ",k,
100               look->training_min[k][j],look->training_max[k][j]);*/
101
102             _ogg_free(look->training_data[k][j]);
103           }
104         /*fprintf(stderr,"\n");*/
105       }
106     }
107     fprintf(stderr,"min/max residue: %g::%g\n",look->tmin,look->tmax);
108
109     /*fprintf(stderr,"residue bit usage %f:%f (%f total)\n",
110             (float)look->phrasebits/look->frames,
111             (float)look->postbits/look->frames,
112             (float)(look->postbits+look->phrasebits)/look->frames);*/
113 #endif
114
115
116     /*vorbis_info_residue0 *info=look->info;
117
118     fprintf(stderr,
119             "%ld frames encoded in %ld phrasebits and %ld residue bits "
120             "(%g/frame) \n",look->frames,look->phrasebits,
121             look->resbitsflat,
122             (look->phrasebits+look->resbitsflat)/(float)look->frames);
123     
124     for(j=0;j<look->parts;j++){
125       long acc=0;
126       fprintf(stderr,"\t[%d] == ",j);
127       for(k=0;k<look->stages;k++)
128         if((info->secondstages[j]>>k)&1){
129           fprintf(stderr,"%ld,",look->resbits[j][k]);
130           acc+=look->resbits[j][k];
131         }
132
133       fprintf(stderr,":: (%ld vals) %1.2fbits/sample\n",look->resvals[j],
134               acc?(float)acc/(look->resvals[j]*info->grouping):0);
135     }
136     fprintf(stderr,"\n");*/
137
138     for(j=0;j<look->parts;j++)
139       if(look->partbooks[j])_ogg_free(look->partbooks[j]);
140     _ogg_free(look->partbooks);
141     for(j=0;j<look->partvals;j++)
142       _ogg_free(look->decodemap[j]);
143     _ogg_free(look->decodemap);
144
145     memset(look,0,sizeof(*look));
146     _ogg_free(look);
147   }
148 }
149
150 static int ilog(unsigned int v){
151   int ret=0;
152   while(v){
153     ret++;
154     v>>=1;
155   }
156   return(ret);
157 }
158
159 static int icount(unsigned int v){
160   int ret=0;
161   while(v){
162     ret+=v&1;
163     v>>=1;
164   }
165   return(ret);
166 }
167
168
169 void res0_pack(vorbis_info_residue *vr,oggpack_buffer *opb){
170   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
171   int j,acc=0;
172   oggpack_write(opb,info->begin,24);
173   oggpack_write(opb,info->end,24);
174
175   oggpack_write(opb,info->grouping-1,24);  /* residue vectors to group and 
176                                              code with a partitioned book */
177   oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
178   oggpack_write(opb,info->groupbook,8);  /* group huffman book */
179
180   /* secondstages is a bitmask; as encoding progresses pass by pass, a
181      bitmask of one indicates this partition class has bits to write
182      this pass */
183   for(j=0;j<info->partitions;j++){
184     if(ilog(info->secondstages[j])>3){
185       /* yes, this is a minor hack due to not thinking ahead */
186       oggpack_write(opb,info->secondstages[j],3); 
187       oggpack_write(opb,1,1);
188       oggpack_write(opb,info->secondstages[j]>>3,5); 
189     }else
190       oggpack_write(opb,info->secondstages[j],4); /* trailing zero */
191     acc+=icount(info->secondstages[j]);
192   }
193   for(j=0;j<acc;j++)
194     oggpack_write(opb,info->booklist[j],8);
195
196 }
197
198 /* vorbis_info is for range checking */
199 vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
200   int j,acc=0;
201   vorbis_info_residue0 *info=_ogg_calloc(1,sizeof(*info));
202   codec_setup_info     *ci=vi->codec_setup;
203
204   info->begin=oggpack_read(opb,24);
205   info->end=oggpack_read(opb,24);
206   info->grouping=oggpack_read(opb,24)+1;
207   info->partitions=oggpack_read(opb,6)+1;
208   info->groupbook=oggpack_read(opb,8);
209
210   for(j=0;j<info->partitions;j++){
211     int cascade=oggpack_read(opb,3);
212     if(oggpack_read(opb,1))
213       cascade|=(oggpack_read(opb,5)<<3);
214     info->secondstages[j]=cascade;
215
216     acc+=icount(cascade);
217   }
218   for(j=0;j<acc;j++)
219     info->booklist[j]=oggpack_read(opb,8);
220
221   if(info->groupbook>=ci->books)goto errout;
222   for(j=0;j<acc;j++)
223     if(info->booklist[j]>=ci->books)goto errout;
224
225   return(info);
226  errout:
227   res0_free_info(info);
228   return(NULL);
229 }
230
231 vorbis_look_residue *res0_look(vorbis_dsp_state *vd,
232                                vorbis_info_residue *vr){
233   vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
234   vorbis_look_residue0 *look=_ogg_calloc(1,sizeof(*look));
235   codec_setup_info     *ci=vd->vi->codec_setup;
236
237   int j,k,acc=0;
238   int dim;
239   int maxstage=0;
240   look->info=info;
241
242   look->parts=info->partitions;
243   look->fullbooks=ci->fullbooks;
244   look->phrasebook=ci->fullbooks+info->groupbook;
245   dim=look->phrasebook->dim;
246
247   look->partbooks=_ogg_calloc(look->parts,sizeof(*look->partbooks));
248
249   for(j=0;j<look->parts;j++){
250     int stages=ilog(info->secondstages[j]);
251     if(stages){
252       if(stages>maxstage)maxstage=stages;
253       look->partbooks[j]=_ogg_calloc(stages,sizeof(*look->partbooks[j]));
254       for(k=0;k<stages;k++)
255         if(info->secondstages[j]&(1<<k)){
256           look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
257 #ifdef TRAIN_RES
258           look->training_data[k][j]=calloc(look->partbooks[j][k]->entries,
259                                            sizeof(***look->training_data));
260 #endif
261         }
262     }
263   }
264
265   look->partvals=rint(pow((float)look->parts,(float)dim));
266   look->stages=maxstage;
267   look->decodemap=_ogg_malloc(look->partvals*sizeof(*look->decodemap));
268   for(j=0;j<look->partvals;j++){
269     long val=j;
270     long mult=look->partvals/look->parts;
271     look->decodemap[j]=_ogg_malloc(dim*sizeof(*look->decodemap[j]));
272     for(k=0;k<dim;k++){
273       long deco=val/mult;
274       val-=deco*mult;
275       mult/=look->parts;
276       look->decodemap[j][k]=deco;
277     }
278   }
279 #ifdef TRAIN_RES
280   {
281     static int train_seq=0;
282     look->train_seq=train_seq++;
283   }
284 #endif
285   return(look);
286 }
287
288 /* break an abstraction and copy some code for performance purposes */
289 static int local_book_besterror(codebook *book,float *a){
290   int dim=book->dim,i,k,o;
291   int best=0;
292   encode_aux_threshmatch *tt=book->c->thresh_tree;
293
294   /* find the quant val of each scalar */
295   for(k=0,o=dim;k<dim;++k){
296     float val=a[--o];
297     i=tt->threshvals>>1;
298
299     if(val<tt->quantthresh[i]){      
300       if(val<tt->quantthresh[i-1]){
301         for(--i;i>0;--i)
302           if(val>=tt->quantthresh[i-1])
303             break;
304       }
305     }else{
306       
307       for(++i;i<tt->threshvals-1;++i)
308         if(val<tt->quantthresh[i])break;
309       
310     }
311     
312     best=(best*tt->quantvals)+tt->quantmap[i];
313   }
314   /* regular lattices are easy :-) */
315   
316   if(book->c->lengthlist[best]<=0){
317     const static_codebook *c=book->c;
318     int i,j;
319     float bestf=0.f;
320     float *e=book->valuelist;
321     best=-1;
322     for(i=0;i<book->entries;i++){
323       if(c->lengthlist[i]>0){
324         float this=0.f;
325         for(j=0;j<dim;j++){
326           float val=(e[j]-a[j]);
327           this+=val*val;
328         }
329         if(best==-1 || this<bestf){
330           bestf=this;
331           best=i;
332         }
333       }
334       e+=dim;
335     }
336   }
337
338   {
339     float *ptr=book->valuelist+best*dim;
340     for(i=0;i<dim;i++)
341       *a++ -= *ptr++;
342   }
343
344   return(best);
345 }
346
347 static int _encodepart(oggpack_buffer *opb,float *vec, int n,
348                        codebook *book,long *acc){
349   int i,bits=0;
350   int dim=book->dim;
351   int step=n/dim;
352
353   for(i=0;i<step;i++){
354     int entry=local_book_besterror(book,vec+i*dim);
355
356 #ifdef TRAIN_RES
357     acc[entry]++;
358 #endif
359
360     bits+=vorbis_book_encode(book,entry,opb);
361   }
362
363   return(bits);
364 }
365
366 static long **_01class(vorbis_block *vb,vorbis_look_residue *vl,
367                        float **in,int ch){
368   long i,j,k;
369   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
370   vorbis_info_residue0 *info=look->info;
371   vorbis_info           *vi=vb->vd->vi;
372   codec_setup_info      *ci=vi->codec_setup;
373
374   /* move all this setup out later */
375   int samples_per_partition=info->grouping;
376   int possible_partitions=info->partitions;
377   int n=info->end-info->begin;
378   
379   int partvals=n/samples_per_partition;
380   long **partword=_vorbis_block_alloc(vb,ch*sizeof(*partword));
381   float scale=100./samples_per_partition;
382
383   /* we find the partition type for each partition of each
384      channel.  We'll go back and do the interleaved encoding in a
385      bit.  For now, clarity */
386  
387   for(i=0;i<ch;i++){
388     partword[i]=_vorbis_block_alloc(vb,n/samples_per_partition*sizeof(*partword[i]));
389     memset(partword[i],0,n/samples_per_partition*sizeof(*partword[i]));
390   }
391   
392   for(i=0;i<partvals;i++){
393     int offset=i*samples_per_partition+info->begin;
394     for(j=0;j<ch;j++){
395       float max=0.;
396       float ent=0.;
397       for(k=0;k<samples_per_partition;k++){
398         if(fabs(in[j][offset+k])>max)max=fabs(in[j][offset+k]);
399         ent+=fabs(rint(in[j][offset+k]));
400       }
401       ent*=scale;
402       
403       for(k=0;k<possible_partitions-1;k++)
404         if(max<=info->classmetric1[k] &&
405            (info->classmetric2[k]<0 || (int)ent<info->classmetric2[k]))
406           break;
407       
408       partword[j][i]=k;  
409     }
410   }
411
412 #ifdef TRAIN_RESAUX
413   {
414     FILE *of;
415     char buffer[80];
416   
417     for(i=0;i<ch;i++){
418       sprintf(buffer,"resaux_%d.vqd",look->train_seq);
419       of=fopen(buffer,"a");
420       for(j=0;j<partvals;j++)
421         fprintf(of,"%ld, ",partword[i][j]);
422       fprintf(of,"\n");
423       fclose(of);
424     }
425   }
426 #endif
427   look->frames++;
428
429   return(partword);
430 }
431
432 /* designed for stereo or other modes where the partition size is an
433    integer multiple of the number of channels encoded in the current
434    submap */
435 static long **_2class(vorbis_block *vb,vorbis_look_residue *vl,float **in,
436                       int ch){
437   long i,j,k,l;
438   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
439   vorbis_info_residue0 *info=look->info;
440
441   /* move all this setup out later */
442   int samples_per_partition=info->grouping;
443   int possible_partitions=info->partitions;
444   int n=info->end-info->begin;
445
446   int partvals=n/samples_per_partition;
447   long **partword=_vorbis_block_alloc(vb,sizeof(*partword));
448
449 #ifdef TRAIN_RES
450   FILE *of;
451   char buffer[80];
452 #endif
453   
454   partword[0]=_vorbis_block_alloc(vb,n*ch/samples_per_partition*sizeof(*partword[0]));
455   memset(partword[0],0,n*ch/samples_per_partition*sizeof(*partword[0]));
456
457   for(i=0,l=info->begin/ch;i<partvals;i++){
458     float magmax=0.f;
459     float angmax=0.f;
460     for(j=0;j<samples_per_partition;j+=ch){
461       if(fabs(in[0][l])>magmax)magmax=fabs(in[0][l]);
462       for(k=1;k<ch;k++)
463         if(fabs(in[k][l])>angmax)angmax=fabs(in[k][l]);
464       l++;
465     }
466
467     for(j=0;j<possible_partitions-1;j++)
468       if(magmax<=info->classmetric1[j] &&
469          angmax<=info->classmetric2[j])
470         break;
471
472     partword[0][i]=j;
473
474   }  
475   
476 #ifdef TRAIN_RESAUX
477   sprintf(buffer,"resaux_%d.vqd",look->train_seq);
478   of=fopen(buffer,"a");
479   for(i=0;i<partvals;i++)
480     fprintf(of,"%ld, ",partword[0][i]);
481   fprintf(of,"\n");
482   fclose(of);
483 #endif
484
485   look->frames++;
486
487   return(partword);
488 }
489
490 static int _01forward(vorbis_block *vb,vorbis_look_residue *vl,
491                       float **in,int ch,
492                       long **partword,
493                       int (*encode)(oggpack_buffer *,float *,int,
494                                     codebook *,long *)){
495   long i,j,k,s;
496   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
497   vorbis_info_residue0 *info=look->info;
498
499   vorbis_dsp_state      *vd=vb->vd;
500
501   /* move all this setup out later */
502   int samples_per_partition=info->grouping;
503   int possible_partitions=info->partitions;
504   int partitions_per_word=look->phrasebook->dim;
505   int n=info->end-info->begin;
506
507   int partvals=n/samples_per_partition;
508   long resbits[128];
509   long resvals[128];
510
511 #ifdef TRAIN_RES
512   for(i=0;i<ch;i++)
513     for(j=info->begin;j<info->end;j++){
514       if(in[i][j]>look->tmax)look->tmax=in[i][j];
515       if(in[i][j]<look->tmin)look->tmin=in[i][j];
516     }
517 #endif
518
519   memset(resbits,0,sizeof(resbits));
520   memset(resvals,0,sizeof(resvals));
521   
522   /* we code the partition words for each channel, then the residual
523      words for a partition per channel until we've written all the
524      residual words for that partition word.  Then write the next
525      partition channel words... */
526
527   for(s=0;s<look->stages;s++){
528
529     for(i=0;i<partvals;){
530
531       /* first we encode a partition codeword for each channel */
532       if(s==0){
533         for(j=0;j<ch;j++){
534           long val=partword[j][i];
535           for(k=1;k<partitions_per_word;k++){
536             val*=possible_partitions;
537             if(i+k<partvals)
538               val+=partword[j][i+k];
539           }     
540
541           /* training hack */
542           if(val<look->phrasebook->entries)
543             look->phrasebits+=vorbis_book_encode(look->phrasebook,val,&vb->opb);
544 #if 0 /*def TRAIN_RES*/
545           else
546             fprintf(stderr,"!");
547 #endif
548         
549         }
550       }
551       
552       /* now we encode interleaved residual values for the partitions */
553       for(k=0;k<partitions_per_word && i<partvals;k++,i++){
554         long offset=i*samples_per_partition+info->begin;
555         
556         for(j=0;j<ch;j++){
557           if(s==0)resvals[partword[j][i]]+=samples_per_partition;
558           if(info->secondstages[partword[j][i]]&(1<<s)){
559             codebook *statebook=look->partbooks[partword[j][i]][s];
560             if(statebook){
561               int ret;
562               long *accumulator=NULL;
563
564 #ifdef TRAIN_RES
565               accumulator=look->training_data[s][partword[j][i]];
566               {
567                 int l;
568                 float *samples=in[j]+offset;
569                 for(l=0;l<samples_per_partition;l++){
570                   if(samples[l]<look->training_min[s][partword[j][i]])
571                     look->training_min[s][partword[j][i]]=samples[l];
572                   if(samples[l]>look->training_max[s][partword[j][i]])
573                     look->training_max[s][partword[j][i]]=samples[l];
574                 }
575               }
576 #endif
577               
578               ret=encode(&vb->opb,in[j]+offset,samples_per_partition,
579                          statebook,accumulator);
580
581               look->postbits+=ret;
582               resbits[partword[j][i]]+=ret;
583             }
584           }
585         }
586       }
587     }
588   }
589
590   /*{
591     long total=0;
592     long totalbits=0;
593     fprintf(stderr,"%d :: ",vb->mode);
594     for(k=0;k<possible_partitions;k++){
595       fprintf(stderr,"%ld/%1.2g, ",resvals[k],(float)resbits[k]/resvals[k]);
596       total+=resvals[k];
597       totalbits+=resbits[k];
598       }
599     
600     fprintf(stderr,":: %ld:%1.2g\n",total,(double)totalbits/total);
601     }*/
602   return(0);
603 }
604
605 /* a truncated packet here just means 'stop working'; it's not an error */
606 static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
607                       float **in,int ch,
608                       long (*decodepart)(codebook *, float *, 
609                                          oggpack_buffer *,int)){
610
611   long i,j,k,l,s;
612   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
613   vorbis_info_residue0 *info=look->info;
614
615   /* move all this setup out later */
616   int samples_per_partition=info->grouping;
617   int partitions_per_word=look->phrasebook->dim;
618   int n=info->end-info->begin;
619   
620   int partvals=n/samples_per_partition;
621   int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
622   int ***partword=alloca(ch*sizeof(*partword));
623
624   for(j=0;j<ch;j++)
625     partword[j]=_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
626
627   for(s=0;s<look->stages;s++){
628
629     /* each loop decodes on partition codeword containing 
630        partitions_pre_word partitions */
631     for(i=0,l=0;i<partvals;l++){
632       if(s==0){
633         /* fetch the partition word for each channel */
634         for(j=0;j<ch;j++){
635           int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
636           if(temp==-1)goto eopbreak;
637           partword[j][l]=look->decodemap[temp];
638           if(partword[j][l]==NULL)goto errout;
639         }
640       }
641       
642       /* now we decode residual values for the partitions */
643       for(k=0;k<partitions_per_word && i<partvals;k++,i++)
644         for(j=0;j<ch;j++){
645           long offset=info->begin+i*samples_per_partition;
646           if(info->secondstages[partword[j][l][k]]&(1<<s)){
647             codebook *stagebook=look->partbooks[partword[j][l][k]][s];
648             if(stagebook){
649               if(decodepart(stagebook,in[j]+offset,&vb->opb,
650                             samples_per_partition)==-1)goto eopbreak;
651             }
652           }
653         }
654     } 
655   }
656   
657  errout:
658  eopbreak:
659   return(0);
660 }
661
662 #if 0
663 /* residue 0 and 1 are just slight variants of one another. 0 is
664    interleaved, 1 is not */
665 long **res0_class(vorbis_block *vb,vorbis_look_residue *vl,
666                   float **in,int *nonzero,int ch){
667   /* we encode only the nonzero parts of a bundle */
668   int i,used=0;
669   for(i=0;i<ch;i++)
670     if(nonzero[i])
671       in[used++]=in[i];
672   if(used)
673     /*return(_01class(vb,vl,in,used,_interleaved_testhack));*/
674     return(_01class(vb,vl,in,used));
675   else
676     return(0);
677 }
678
679 int res0_forward(vorbis_block *vb,vorbis_look_residue *vl,
680                  float **in,float **out,int *nonzero,int ch,
681                  long **partword){
682   /* we encode only the nonzero parts of a bundle */
683   int i,j,used=0,n=vb->pcmend/2;
684   for(i=0;i<ch;i++)
685     if(nonzero[i]){
686       if(out)
687         for(j=0;j<n;j++)
688           out[i][j]+=in[i][j];
689       in[used++]=in[i];
690     }
691   if(used){
692     int ret=_01forward(vb,vl,in,used,partword,
693                       _interleaved_encodepart);
694     if(out){
695       used=0;
696       for(i=0;i<ch;i++)
697         if(nonzero[i]){
698           for(j=0;j<n;j++)
699             out[i][j]-=in[used][j];
700           used++;
701         }
702     }
703     return(ret);
704   }else{
705     return(0);
706   }
707 }
708 #endif
709
710 int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
711                  float **in,int *nonzero,int ch){
712   int i,used=0;
713   for(i=0;i<ch;i++)
714     if(nonzero[i])
715       in[used++]=in[i];
716   if(used)
717     return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
718   else
719     return(0);
720 }
721
722 int res1_forward(vorbis_block *vb,vorbis_look_residue *vl,
723                  float **in,float **out,int *nonzero,int ch,
724                  long **partword){
725   int i,j,used=0,n=vb->pcmend/2;
726   for(i=0;i<ch;i++)
727     if(nonzero[i]){
728       if(out)
729         for(j=0;j<n;j++)
730           out[i][j]+=in[i][j];
731       in[used++]=in[i];
732     }
733
734   if(used){
735     int ret=_01forward(vb,vl,in,used,partword,_encodepart);
736     if(out){
737       used=0;
738       for(i=0;i<ch;i++)
739         if(nonzero[i]){
740           for(j=0;j<n;j++)
741             out[i][j]-=in[used][j];
742           used++;
743         }
744     }
745     return(ret);
746   }else{
747     return(0);
748   }
749 }
750
751 long **res1_class(vorbis_block *vb,vorbis_look_residue *vl,
752                   float **in,int *nonzero,int ch){
753   int i,used=0;
754   for(i=0;i<ch;i++)
755     if(nonzero[i])
756       in[used++]=in[i];
757   if(used)
758     return(_01class(vb,vl,in,used));
759   else
760     return(0);
761 }
762
763 int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
764                  float **in,int *nonzero,int ch){
765   int i,used=0;
766   for(i=0;i<ch;i++)
767     if(nonzero[i])
768       in[used++]=in[i];
769   if(used)
770     return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
771   else
772     return(0);
773 }
774
775 long **res2_class(vorbis_block *vb,vorbis_look_residue *vl,
776                   float **in,int *nonzero,int ch){
777   int i,used=0;
778   for(i=0;i<ch;i++)
779     if(nonzero[i])used++;
780   if(used)
781     return(_2class(vb,vl,in,ch));
782   else
783     return(0);
784 }
785
786 /* res2 is slightly more different; all the channels are interleaved
787    into a single vector and encoded. */
788
789 int res2_forward(vorbis_block *vb,vorbis_look_residue *vl,
790                  float **in,float **out,int *nonzero,int ch,
791                  long **partword){
792   long i,j,k,n=vb->pcmend/2,used=0;
793
794   /* don't duplicate the code; use a working vector hack for now and
795      reshape ourselves into a single channel res1 */
796   /* ugly; reallocs for each coupling pass :-( */
797   float *work=_vorbis_block_alloc(vb,ch*n*sizeof(*work));
798   for(i=0;i<ch;i++){
799     float *pcm=in[i];
800     if(nonzero[i])used++;
801     for(j=0,k=i;j<n;j++,k+=ch)
802       work[k]=pcm[j];
803   }
804   
805   if(used){
806     int ret=_01forward(vb,vl,&work,1,partword,_encodepart);
807     /* update the sofar vector */
808     if(out){
809       for(i=0;i<ch;i++){
810         float *pcm=in[i];
811         float *sofar=out[i];
812         for(j=0,k=i;j<n;j++,k+=ch)
813           sofar[j]+=pcm[j]-work[k];
814         
815       }
816     }
817     return(ret);
818   }else{
819     return(0);
820   }
821 }
822
823 /* duplicate code here as speed is somewhat more important */
824 int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
825                  float **in,int *nonzero,int ch){
826   long i,k,l,s;
827   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
828   vorbis_info_residue0 *info=look->info;
829
830   /* move all this setup out later */
831   int samples_per_partition=info->grouping;
832   int partitions_per_word=look->phrasebook->dim;
833   int n=info->end-info->begin;
834
835   int partvals=n/samples_per_partition;
836   int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
837   int **partword=_vorbis_block_alloc(vb,partwords*sizeof(*partword));
838
839   for(i=0;i<ch;i++)if(nonzero[i])break;
840   if(i==ch)return(0); /* no nonzero vectors */
841
842   for(s=0;s<look->stages;s++){
843     for(i=0,l=0;i<partvals;l++){
844
845       if(s==0){
846         /* fetch the partition word */
847         int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
848         if(temp==-1)goto eopbreak;
849         partword[l]=look->decodemap[temp];
850         if(partword[l]==NULL)goto errout;
851       }
852
853       /* now we decode residual values for the partitions */
854       for(k=0;k<partitions_per_word && i<partvals;k++,i++)
855         if(info->secondstages[partword[l][k]]&(1<<s)){
856           codebook *stagebook=look->partbooks[partword[l][k]][s];
857           
858           if(stagebook){
859             if(vorbis_book_decodevv_add(stagebook,in,
860                                         i*samples_per_partition+info->begin,ch,
861                                         &vb->opb,samples_per_partition)==-1)
862               goto eopbreak;
863           }
864         }
865     } 
866   }
867   
868  errout:
869  eopbreak:
870   return(0);
871 }
872
873
874 vorbis_func_residue residue0_exportbundle={
875   NULL,
876   &res0_unpack,
877   &res0_look,
878   &res0_free_info,
879   &res0_free_look,
880   NULL,
881   NULL,
882   &res0_inverse
883 };
884
885 vorbis_func_residue residue1_exportbundle={
886   &res0_pack,
887   &res0_unpack,
888   &res0_look,
889   &res0_free_info,
890   &res0_free_look,
891   &res1_class,
892   &res1_forward,
893   &res1_inverse
894 };
895
896 vorbis_func_residue residue2_exportbundle={
897   &res0_pack,
898   &res0_unpack,
899   &res0_look,
900   &res0_free_info,
901   &res0_free_look,
902   &res2_class,
903   &res2_forward,
904   &res2_inverse
905 };
906