vrshoot
view libs/vorbis/res0.c @ 1:e7ca128b8713
looks nice :)
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 02 Feb 2014 00:35:22 +0200 |
| parents | |
| children |
line source
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 1994-2010 *
9 * by the Xiph.Org Foundation http://www.xiph.org/ *
10 * *
11 ********************************************************************
13 function: residue backend 0, 1 and 2 implementation
14 last mod: $Id: res0.c 17556 2010-10-21 18:25:19Z tterribe $
16 ********************************************************************/
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. */
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"
34 /*#define TRAIN_RES 1*/
35 /*#define TRAIN_RESAUX 1*/
37 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
38 #include <stdio.h>
39 #endif
41 typedef struct {
42 vorbis_info_residue0 *info;
44 int parts;
45 int stages;
46 codebook *fullbooks;
47 codebook *phrasebook;
48 codebook ***partbooks;
50 int partvals;
51 int **decodemap;
53 long postbits;
54 long phrasebits;
55 long frames;
57 #if defined(TRAIN_RES) || defined(TRAIN_RESAUX)
58 int train_seq;
59 long *training_data[8][64];
60 float training_max[8][64];
61 float training_min[8][64];
62 float tmin;
63 float tmax;
64 int submap;
65 #endif
67 } vorbis_look_residue0;
69 void res0_free_info(vorbis_info_residue *i){
70 vorbis_info_residue0 *info=(vorbis_info_residue0 *)i;
71 if(info){
72 memset(info,0,sizeof(*info));
73 _ogg_free(info);
74 }
75 }
77 void res0_free_look(vorbis_look_residue *i){
78 int j;
79 if(i){
81 vorbis_look_residue0 *look=(vorbis_look_residue0 *)i;
83 #ifdef TRAIN_RES
84 {
85 int j,k,l;
86 for(j=0;j<look->parts;j++){
87 /*fprintf(stderr,"partition %d: ",j);*/
88 for(k=0;k<8;k++)
89 if(look->training_data[k][j]){
90 char buffer[80];
91 FILE *of;
92 codebook *statebook=look->partbooks[j][k];
94 /* long and short into the same bucket by current convention */
95 sprintf(buffer,"res_sub%d_part%d_pass%d.vqd",look->submap,j,k);
96 of=fopen(buffer,"a");
98 for(l=0;l<statebook->entries;l++)
99 fprintf(of,"%d:%ld\n",l,look->training_data[k][j][l]);
101 fclose(of);
103 /*fprintf(stderr,"%d(%.2f|%.2f) ",k,
104 look->training_min[k][j],look->training_max[k][j]);*/
106 _ogg_free(look->training_data[k][j]);
107 look->training_data[k][j]=NULL;
108 }
109 /*fprintf(stderr,"\n");*/
110 }
111 }
112 fprintf(stderr,"min/max residue: %g::%g\n",look->tmin,look->tmax);
114 /*fprintf(stderr,"residue bit usage %f:%f (%f total)\n",
115 (float)look->phrasebits/look->frames,
116 (float)look->postbits/look->frames,
117 (float)(look->postbits+look->phrasebits)/look->frames);*/
118 #endif
121 /*vorbis_info_residue0 *info=look->info;
123 fprintf(stderr,
124 "%ld frames encoded in %ld phrasebits and %ld residue bits "
125 "(%g/frame) \n",look->frames,look->phrasebits,
126 look->resbitsflat,
127 (look->phrasebits+look->resbitsflat)/(float)look->frames);
129 for(j=0;j<look->parts;j++){
130 long acc=0;
131 fprintf(stderr,"\t[%d] == ",j);
132 for(k=0;k<look->stages;k++)
133 if((info->secondstages[j]>>k)&1){
134 fprintf(stderr,"%ld,",look->resbits[j][k]);
135 acc+=look->resbits[j][k];
136 }
138 fprintf(stderr,":: (%ld vals) %1.2fbits/sample\n",look->resvals[j],
139 acc?(float)acc/(look->resvals[j]*info->grouping):0);
140 }
141 fprintf(stderr,"\n");*/
143 for(j=0;j<look->parts;j++)
144 if(look->partbooks[j])_ogg_free(look->partbooks[j]);
145 _ogg_free(look->partbooks);
146 for(j=0;j<look->partvals;j++)
147 _ogg_free(look->decodemap[j]);
148 _ogg_free(look->decodemap);
150 memset(look,0,sizeof(*look));
151 _ogg_free(look);
152 }
153 }
155 static int ilog(unsigned int v){
156 int ret=0;
157 while(v){
158 ret++;
159 v>>=1;
160 }
161 return(ret);
162 }
164 static int icount(unsigned int v){
165 int ret=0;
166 while(v){
167 ret+=v&1;
168 v>>=1;
169 }
170 return(ret);
171 }
174 void res0_pack(vorbis_info_residue *vr,oggpack_buffer *opb){
175 vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
176 int j,acc=0;
177 oggpack_write(opb,info->begin,24);
178 oggpack_write(opb,info->end,24);
180 oggpack_write(opb,info->grouping-1,24); /* residue vectors to group and
181 code with a partitioned book */
182 oggpack_write(opb,info->partitions-1,6); /* possible partition choices */
183 oggpack_write(opb,info->groupbook,8); /* group huffman book */
185 /* secondstages is a bitmask; as encoding progresses pass by pass, a
186 bitmask of one indicates this partition class has bits to write
187 this pass */
188 for(j=0;j<info->partitions;j++){
189 if(ilog(info->secondstages[j])>3){
190 /* yes, this is a minor hack due to not thinking ahead */
191 oggpack_write(opb,info->secondstages[j],3);
192 oggpack_write(opb,1,1);
193 oggpack_write(opb,info->secondstages[j]>>3,5);
194 }else
195 oggpack_write(opb,info->secondstages[j],4); /* trailing zero */
196 acc+=icount(info->secondstages[j]);
197 }
198 for(j=0;j<acc;j++)
199 oggpack_write(opb,info->booklist[j],8);
201 }
203 /* vorbis_info is for range checking */
204 vorbis_info_residue *res0_unpack(vorbis_info *vi,oggpack_buffer *opb){
205 int j,acc=0;
206 vorbis_info_residue0 *info=_ogg_calloc(1,sizeof(*info));
207 codec_setup_info *ci=vi->codec_setup;
209 info->begin=oggpack_read(opb,24);
210 info->end=oggpack_read(opb,24);
211 info->grouping=oggpack_read(opb,24)+1;
212 info->partitions=oggpack_read(opb,6)+1;
213 info->groupbook=oggpack_read(opb,8);
215 /* check for premature EOP */
216 if(info->groupbook<0)goto errout;
218 for(j=0;j<info->partitions;j++){
219 int cascade=oggpack_read(opb,3);
220 int cflag=oggpack_read(opb,1);
221 if(cflag<0) goto errout;
222 if(cflag){
223 int c=oggpack_read(opb,5);
224 if(c<0) goto errout;
225 cascade|=(c<<3);
226 }
227 info->secondstages[j]=cascade;
229 acc+=icount(cascade);
230 }
231 for(j=0;j<acc;j++){
232 int book=oggpack_read(opb,8);
233 if(book<0) goto errout;
234 info->booklist[j]=book;
235 }
237 if(info->groupbook>=ci->books)goto errout;
238 for(j=0;j<acc;j++){
239 if(info->booklist[j]>=ci->books)goto errout;
240 if(ci->book_param[info->booklist[j]]->maptype==0)goto errout;
241 }
243 /* verify the phrasebook is not specifying an impossible or
244 inconsistent partitioning scheme. */
245 /* modify the phrasebook ranging check from r16327; an early beta
246 encoder had a bug where it used an oversized phrasebook by
247 accident. These files should continue to be playable, but don't
248 allow an exploit */
249 {
250 int entries = ci->book_param[info->groupbook]->entries;
251 int dim = ci->book_param[info->groupbook]->dim;
252 int partvals = 1;
253 if (dim<1) goto errout;
254 while(dim>0){
255 partvals *= info->partitions;
256 if(partvals > entries) goto errout;
257 dim--;
258 }
259 info->partvals = partvals;
260 }
262 return(info);
263 errout:
264 res0_free_info(info);
265 return(NULL);
266 }
268 vorbis_look_residue *res0_look(vorbis_dsp_state *vd,
269 vorbis_info_residue *vr){
270 vorbis_info_residue0 *info=(vorbis_info_residue0 *)vr;
271 vorbis_look_residue0 *look=_ogg_calloc(1,sizeof(*look));
272 codec_setup_info *ci=vd->vi->codec_setup;
274 int j,k,acc=0;
275 int dim;
276 int maxstage=0;
277 look->info=info;
279 look->parts=info->partitions;
280 look->fullbooks=ci->fullbooks;
281 look->phrasebook=ci->fullbooks+info->groupbook;
282 dim=look->phrasebook->dim;
284 look->partbooks=_ogg_calloc(look->parts,sizeof(*look->partbooks));
286 for(j=0;j<look->parts;j++){
287 int stages=ilog(info->secondstages[j]);
288 if(stages){
289 if(stages>maxstage)maxstage=stages;
290 look->partbooks[j]=_ogg_calloc(stages,sizeof(*look->partbooks[j]));
291 for(k=0;k<stages;k++)
292 if(info->secondstages[j]&(1<<k)){
293 look->partbooks[j][k]=ci->fullbooks+info->booklist[acc++];
294 #ifdef TRAIN_RES
295 look->training_data[k][j]=_ogg_calloc(look->partbooks[j][k]->entries,
296 sizeof(***look->training_data));
297 #endif
298 }
299 }
300 }
302 look->partvals=1;
303 for(j=0;j<dim;j++)
304 look->partvals*=look->parts;
306 look->stages=maxstage;
307 look->decodemap=_ogg_malloc(look->partvals*sizeof(*look->decodemap));
308 for(j=0;j<look->partvals;j++){
309 long val=j;
310 long mult=look->partvals/look->parts;
311 look->decodemap[j]=_ogg_malloc(dim*sizeof(*look->decodemap[j]));
312 for(k=0;k<dim;k++){
313 long deco=val/mult;
314 val-=deco*mult;
315 mult/=look->parts;
316 look->decodemap[j][k]=deco;
317 }
318 }
319 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
320 {
321 static int train_seq=0;
322 look->train_seq=train_seq++;
323 }
324 #endif
325 return(look);
326 }
328 /* break an abstraction and copy some code for performance purposes */
329 static int local_book_besterror(codebook *book,int *a){
330 int dim=book->dim;
331 int i,j,o;
332 int minval=book->minval;
333 int del=book->delta;
334 int qv=book->quantvals;
335 int ze=(qv>>1);
336 int index=0;
337 /* assumes integer/centered encoder codebook maptype 1 no more than dim 8 */
338 int p[8]={0,0,0,0,0,0,0,0};
340 if(del!=1){
341 for(i=0,o=dim;i<dim;i++){
342 int v = (a[--o]-minval+(del>>1))/del;
343 int m = (v<ze ? ((ze-v)<<1)-1 : ((v-ze)<<1));
344 index = index*qv+ (m<0?0:(m>=qv?qv-1:m));
345 p[o]=v*del+minval;
346 }
347 }else{
348 for(i=0,o=dim;i<dim;i++){
349 int v = a[--o]-minval;
350 int m = (v<ze ? ((ze-v)<<1)-1 : ((v-ze)<<1));
351 index = index*qv+ (m<0?0:(m>=qv?qv-1:m));
352 p[o]=v*del+minval;
353 }
354 }
356 if(book->c->lengthlist[index]<=0){
357 const static_codebook *c=book->c;
358 int best=-1;
359 /* assumes integer/centered encoder codebook maptype 1 no more than dim 8 */
360 int e[8]={0,0,0,0,0,0,0,0};
361 int maxval = book->minval + book->delta*(book->quantvals-1);
362 for(i=0;i<book->entries;i++){
363 if(c->lengthlist[i]>0){
364 int this=0;
365 for(j=0;j<dim;j++){
366 int val=(e[j]-a[j]);
367 this+=val*val;
368 }
369 if(best==-1 || this<best){
370 memcpy(p,e,sizeof(p));
371 best=this;
372 index=i;
373 }
374 }
375 /* assumes the value patterning created by the tools in vq/ */
376 j=0;
377 while(e[j]>=maxval)
378 e[j++]=0;
379 if(e[j]>=0)
380 e[j]+=book->delta;
381 e[j]= -e[j];
382 }
383 }
385 if(index>-1){
386 for(i=0;i<dim;i++)
387 *a++ -= p[i];
388 }
390 return(index);
391 }
393 static int _encodepart(oggpack_buffer *opb,int *vec, int n,
394 codebook *book,long *acc){
395 int i,bits=0;
396 int dim=book->dim;
397 int step=n/dim;
399 for(i=0;i<step;i++){
400 int entry=local_book_besterror(book,vec+i*dim);
402 #ifdef TRAIN_RES
403 if(entry>=0)
404 acc[entry]++;
405 #endif
407 bits+=vorbis_book_encode(book,entry,opb);
409 }
411 return(bits);
412 }
414 static long **_01class(vorbis_block *vb,vorbis_look_residue *vl,
415 int **in,int ch){
416 long i,j,k;
417 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
418 vorbis_info_residue0 *info=look->info;
420 /* move all this setup out later */
421 int samples_per_partition=info->grouping;
422 int possible_partitions=info->partitions;
423 int n=info->end-info->begin;
425 int partvals=n/samples_per_partition;
426 long **partword=_vorbis_block_alloc(vb,ch*sizeof(*partword));
427 float scale=100./samples_per_partition;
429 /* we find the partition type for each partition of each
430 channel. We'll go back and do the interleaved encoding in a
431 bit. For now, clarity */
433 for(i=0;i<ch;i++){
434 partword[i]=_vorbis_block_alloc(vb,n/samples_per_partition*sizeof(*partword[i]));
435 memset(partword[i],0,n/samples_per_partition*sizeof(*partword[i]));
436 }
438 for(i=0;i<partvals;i++){
439 int offset=i*samples_per_partition+info->begin;
440 for(j=0;j<ch;j++){
441 int max=0;
442 int ent=0;
443 for(k=0;k<samples_per_partition;k++){
444 if(abs(in[j][offset+k])>max)max=abs(in[j][offset+k]);
445 ent+=abs(in[j][offset+k]);
446 }
447 ent*=scale;
449 for(k=0;k<possible_partitions-1;k++)
450 if(max<=info->classmetric1[k] &&
451 (info->classmetric2[k]<0 || ent<info->classmetric2[k]))
452 break;
454 partword[j][i]=k;
455 }
456 }
458 #ifdef TRAIN_RESAUX
459 {
460 FILE *of;
461 char buffer[80];
463 for(i=0;i<ch;i++){
464 sprintf(buffer,"resaux_%d.vqd",look->train_seq);
465 of=fopen(buffer,"a");
466 for(j=0;j<partvals;j++)
467 fprintf(of,"%ld, ",partword[i][j]);
468 fprintf(of,"\n");
469 fclose(of);
470 }
471 }
472 #endif
473 look->frames++;
475 return(partword);
476 }
478 /* designed for stereo or other modes where the partition size is an
479 integer multiple of the number of channels encoded in the current
480 submap */
481 static long **_2class(vorbis_block *vb,vorbis_look_residue *vl,int **in,
482 int ch){
483 long i,j,k,l;
484 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
485 vorbis_info_residue0 *info=look->info;
487 /* move all this setup out later */
488 int samples_per_partition=info->grouping;
489 int possible_partitions=info->partitions;
490 int n=info->end-info->begin;
492 int partvals=n/samples_per_partition;
493 long **partword=_vorbis_block_alloc(vb,sizeof(*partword));
495 #if defined(TRAIN_RES) || defined (TRAIN_RESAUX)
496 FILE *of;
497 char buffer[80];
498 #endif
500 partword[0]=_vorbis_block_alloc(vb,partvals*sizeof(*partword[0]));
501 memset(partword[0],0,partvals*sizeof(*partword[0]));
503 for(i=0,l=info->begin/ch;i<partvals;i++){
504 int magmax=0;
505 int angmax=0;
506 for(j=0;j<samples_per_partition;j+=ch){
507 if(abs(in[0][l])>magmax)magmax=abs(in[0][l]);
508 for(k=1;k<ch;k++)
509 if(abs(in[k][l])>angmax)angmax=abs(in[k][l]);
510 l++;
511 }
513 for(j=0;j<possible_partitions-1;j++)
514 if(magmax<=info->classmetric1[j] &&
515 angmax<=info->classmetric2[j])
516 break;
518 partword[0][i]=j;
520 }
522 #ifdef TRAIN_RESAUX
523 sprintf(buffer,"resaux_%d.vqd",look->train_seq);
524 of=fopen(buffer,"a");
525 for(i=0;i<partvals;i++)
526 fprintf(of,"%ld, ",partword[0][i]);
527 fprintf(of,"\n");
528 fclose(of);
529 #endif
531 look->frames++;
533 return(partword);
534 }
536 static int _01forward(oggpack_buffer *opb,
537 vorbis_block *vb,vorbis_look_residue *vl,
538 int **in,int ch,
539 long **partword,
540 int (*encode)(oggpack_buffer *,int *,int,
541 codebook *,long *),
542 int submap){
543 long i,j,k,s;
544 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
545 vorbis_info_residue0 *info=look->info;
547 #ifdef TRAIN_RES
548 look->submap=submap;
549 #endif
551 /* move all this setup out later */
552 int samples_per_partition=info->grouping;
553 int possible_partitions=info->partitions;
554 int partitions_per_word=look->phrasebook->dim;
555 int n=info->end-info->begin;
557 int partvals=n/samples_per_partition;
558 long resbits[128];
559 long resvals[128];
561 #ifdef TRAIN_RES
562 for(i=0;i<ch;i++)
563 for(j=info->begin;j<info->end;j++){
564 if(in[i][j]>look->tmax)look->tmax=in[i][j];
565 if(in[i][j]<look->tmin)look->tmin=in[i][j];
566 }
567 #endif
569 memset(resbits,0,sizeof(resbits));
570 memset(resvals,0,sizeof(resvals));
572 /* we code the partition words for each channel, then the residual
573 words for a partition per channel until we've written all the
574 residual words for that partition word. Then write the next
575 partition channel words... */
577 for(s=0;s<look->stages;s++){
579 for(i=0;i<partvals;){
581 /* first we encode a partition codeword for each channel */
582 if(s==0){
583 for(j=0;j<ch;j++){
584 long val=partword[j][i];
585 for(k=1;k<partitions_per_word;k++){
586 val*=possible_partitions;
587 if(i+k<partvals)
588 val+=partword[j][i+k];
589 }
591 /* training hack */
592 if(val<look->phrasebook->entries)
593 look->phrasebits+=vorbis_book_encode(look->phrasebook,val,opb);
594 #if 0 /*def TRAIN_RES*/
595 else
596 fprintf(stderr,"!");
597 #endif
599 }
600 }
602 /* now we encode interleaved residual values for the partitions */
603 for(k=0;k<partitions_per_word && i<partvals;k++,i++){
604 long offset=i*samples_per_partition+info->begin;
606 for(j=0;j<ch;j++){
607 if(s==0)resvals[partword[j][i]]+=samples_per_partition;
608 if(info->secondstages[partword[j][i]]&(1<<s)){
609 codebook *statebook=look->partbooks[partword[j][i]][s];
610 if(statebook){
611 int ret;
612 long *accumulator=NULL;
614 #ifdef TRAIN_RES
615 accumulator=look->training_data[s][partword[j][i]];
616 {
617 int l;
618 int *samples=in[j]+offset;
619 for(l=0;l<samples_per_partition;l++){
620 if(samples[l]<look->training_min[s][partword[j][i]])
621 look->training_min[s][partword[j][i]]=samples[l];
622 if(samples[l]>look->training_max[s][partword[j][i]])
623 look->training_max[s][partword[j][i]]=samples[l];
624 }
625 }
626 #endif
628 ret=encode(opb,in[j]+offset,samples_per_partition,
629 statebook,accumulator);
631 look->postbits+=ret;
632 resbits[partword[j][i]]+=ret;
633 }
634 }
635 }
636 }
637 }
638 }
640 /*{
641 long total=0;
642 long totalbits=0;
643 fprintf(stderr,"%d :: ",vb->mode);
644 for(k=0;k<possible_partitions;k++){
645 fprintf(stderr,"%ld/%1.2g, ",resvals[k],(float)resbits[k]/resvals[k]);
646 total+=resvals[k];
647 totalbits+=resbits[k];
648 }
650 fprintf(stderr,":: %ld:%1.2g\n",total,(double)totalbits/total);
651 }*/
653 return(0);
654 }
656 /* a truncated packet here just means 'stop working'; it's not an error */
657 static int _01inverse(vorbis_block *vb,vorbis_look_residue *vl,
658 float **in,int ch,
659 long (*decodepart)(codebook *, float *,
660 oggpack_buffer *,int)){
662 long i,j,k,l,s;
663 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
664 vorbis_info_residue0 *info=look->info;
666 /* move all this setup out later */
667 int samples_per_partition=info->grouping;
668 int partitions_per_word=look->phrasebook->dim;
669 int max=vb->pcmend>>1;
670 int end=(info->end<max?info->end:max);
671 int n=end-info->begin;
673 if(n>0){
674 int partvals=n/samples_per_partition;
675 int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
676 int ***partword=alloca(ch*sizeof(*partword));
678 for(j=0;j<ch;j++)
679 partword[j]=_vorbis_block_alloc(vb,partwords*sizeof(*partword[j]));
681 for(s=0;s<look->stages;s++){
683 /* each loop decodes on partition codeword containing
684 partitions_per_word partitions */
685 for(i=0,l=0;i<partvals;l++){
686 if(s==0){
687 /* fetch the partition word for each channel */
688 for(j=0;j<ch;j++){
689 int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
691 if(temp==-1 || temp>=info->partvals)goto eopbreak;
692 partword[j][l]=look->decodemap[temp];
693 if(partword[j][l]==NULL)goto errout;
694 }
695 }
697 /* now we decode residual values for the partitions */
698 for(k=0;k<partitions_per_word && i<partvals;k++,i++)
699 for(j=0;j<ch;j++){
700 long offset=info->begin+i*samples_per_partition;
701 if(info->secondstages[partword[j][l][k]]&(1<<s)){
702 codebook *stagebook=look->partbooks[partword[j][l][k]][s];
703 if(stagebook){
704 if(decodepart(stagebook,in[j]+offset,&vb->opb,
705 samples_per_partition)==-1)goto eopbreak;
706 }
707 }
708 }
709 }
710 }
711 }
712 errout:
713 eopbreak:
714 return(0);
715 }
717 int res0_inverse(vorbis_block *vb,vorbis_look_residue *vl,
718 float **in,int *nonzero,int ch){
719 int i,used=0;
720 for(i=0;i<ch;i++)
721 if(nonzero[i])
722 in[used++]=in[i];
723 if(used)
724 return(_01inverse(vb,vl,in,used,vorbis_book_decodevs_add));
725 else
726 return(0);
727 }
729 int res1_forward(oggpack_buffer *opb,vorbis_block *vb,vorbis_look_residue *vl,
730 int **in,int *nonzero,int ch, long **partword, int submap){
731 int i,used=0;
732 for(i=0;i<ch;i++)
733 if(nonzero[i])
734 in[used++]=in[i];
736 if(used){
737 return _01forward(opb,vb,vl,in,used,partword,_encodepart,submap);
738 }else{
739 return(0);
740 }
741 }
743 long **res1_class(vorbis_block *vb,vorbis_look_residue *vl,
744 int **in,int *nonzero,int ch){
745 int i,used=0;
746 for(i=0;i<ch;i++)
747 if(nonzero[i])
748 in[used++]=in[i];
749 if(used)
750 return(_01class(vb,vl,in,used));
751 else
752 return(0);
753 }
755 int res1_inverse(vorbis_block *vb,vorbis_look_residue *vl,
756 float **in,int *nonzero,int ch){
757 int i,used=0;
758 for(i=0;i<ch;i++)
759 if(nonzero[i])
760 in[used++]=in[i];
761 if(used)
762 return(_01inverse(vb,vl,in,used,vorbis_book_decodev_add));
763 else
764 return(0);
765 }
767 long **res2_class(vorbis_block *vb,vorbis_look_residue *vl,
768 int **in,int *nonzero,int ch){
769 int i,used=0;
770 for(i=0;i<ch;i++)
771 if(nonzero[i])used++;
772 if(used)
773 return(_2class(vb,vl,in,ch));
774 else
775 return(0);
776 }
778 /* res2 is slightly more different; all the channels are interleaved
779 into a single vector and encoded. */
781 int res2_forward(oggpack_buffer *opb,
782 vorbis_block *vb,vorbis_look_residue *vl,
783 int **in,int *nonzero,int ch, long **partword,int submap){
784 long i,j,k,n=vb->pcmend/2,used=0;
786 /* don't duplicate the code; use a working vector hack for now and
787 reshape ourselves into a single channel res1 */
788 /* ugly; reallocs for each coupling pass :-( */
789 int *work=_vorbis_block_alloc(vb,ch*n*sizeof(*work));
790 for(i=0;i<ch;i++){
791 int *pcm=in[i];
792 if(nonzero[i])used++;
793 for(j=0,k=i;j<n;j++,k+=ch)
794 work[k]=pcm[j];
795 }
797 if(used){
798 return _01forward(opb,vb,vl,&work,1,partword,_encodepart,submap);
799 }else{
800 return(0);
801 }
802 }
804 /* duplicate code here as speed is somewhat more important */
805 int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
806 float **in,int *nonzero,int ch){
807 long i,k,l,s;
808 vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
809 vorbis_info_residue0 *info=look->info;
811 /* move all this setup out later */
812 int samples_per_partition=info->grouping;
813 int partitions_per_word=look->phrasebook->dim;
814 int max=(vb->pcmend*ch)>>1;
815 int end=(info->end<max?info->end:max);
816 int n=end-info->begin;
818 if(n>0){
819 int partvals=n/samples_per_partition;
820 int partwords=(partvals+partitions_per_word-1)/partitions_per_word;
821 int **partword=_vorbis_block_alloc(vb,partwords*sizeof(*partword));
823 for(i=0;i<ch;i++)if(nonzero[i])break;
824 if(i==ch)return(0); /* no nonzero vectors */
826 for(s=0;s<look->stages;s++){
827 for(i=0,l=0;i<partvals;l++){
829 if(s==0){
830 /* fetch the partition word */
831 int temp=vorbis_book_decode(look->phrasebook,&vb->opb);
832 if(temp==-1 || temp>=info->partvals)goto eopbreak;
833 partword[l]=look->decodemap[temp];
834 if(partword[l]==NULL)goto errout;
835 }
837 /* now we decode residual values for the partitions */
838 for(k=0;k<partitions_per_word && i<partvals;k++,i++)
839 if(info->secondstages[partword[l][k]]&(1<<s)){
840 codebook *stagebook=look->partbooks[partword[l][k]][s];
842 if(stagebook){
843 if(vorbis_book_decodevv_add(stagebook,in,
844 i*samples_per_partition+info->begin,ch,
845 &vb->opb,samples_per_partition)==-1)
846 goto eopbreak;
847 }
848 }
849 }
850 }
851 }
852 errout:
853 eopbreak:
854 return(0);
855 }
858 const vorbis_func_residue residue0_exportbundle={
859 NULL,
860 &res0_unpack,
861 &res0_look,
862 &res0_free_info,
863 &res0_free_look,
864 NULL,
865 NULL,
866 &res0_inverse
867 };
869 const vorbis_func_residue residue1_exportbundle={
870 &res0_pack,
871 &res0_unpack,
872 &res0_look,
873 &res0_free_info,
874 &res0_free_look,
875 &res1_class,
876 &res1_forward,
877 &res1_inverse
878 };
880 const vorbis_func_residue residue2_exportbundle={
881 &res0_pack,
882 &res0_unpack,
883 &res0_look,
884 &res0_free_info,
885 &res0_free_look,
886 &res2_class,
887 &res2_forward,
888 &res2_inverse
889 };