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 1994-2015 *
9 * by the Xiph.Org Foundation https://xiph.org/ *
10 * *
11 ********************************************************************
12
13 function: maintain the info structure, info <-> header packets
14
15 ********************************************************************/
16
17/* general handling of the header and the vorbis_info structure (and
18 substructures) */
19
20#include <stdlib.h>
21#include <string.h>
22#include <ogg/ogg.h>
23#include "vorbis/codec.h"
24#include "codec_internal.h"
25#include "codebook.h"
26#include "registry.h"
27#include "window.h"
28#include "psy.h"
29#include "misc.h"
30#include "os.h"
31
32#define GENERAL_VENDOR_STRING "Xiph.Org libVorbis 1.3.7"
33#define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20200704 (Reducing Environment)"
34
35/* helpers */
36static void _v_writestring(oggpack_buffer *o,const char *s, int bytes){
37
38 while(bytes--){
39 oggpack_write(o,*s++,8);
40 }
41}
42
43static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
44 while(bytes--){
45 *buf++=oggpack_read(o,8);
46 }
47}
48
49static int _v_toupper(int c) {
50 return (c >= 'a' && c <= 'z') ? (c & ~('a' - 'A')) : c;
51}
52
53void vorbis_comment_init(vorbis_comment *vc){
54 memset(vc,0,sizeof(*vc));
55}
56
57void vorbis_comment_add(vorbis_comment *vc,const char *comment){
58 vc->user_comments=_ogg_realloc(vc->user_comments,
59 (vc->comments+2)*sizeof(*vc->user_comments));
60 vc->comment_lengths=_ogg_realloc(vc->comment_lengths,
61 (vc->comments+2)*sizeof(*vc->comment_lengths));
62 vc->comment_lengths[vc->comments]=strlen(comment);
63 vc->user_comments[vc->comments]=_ogg_malloc(vc->comment_lengths[vc->comments]+1);
64 strcpy(vc->user_comments[vc->comments], comment);
65 vc->comments++;
66 vc->user_comments[vc->comments]=NULL;
67}
68
69void vorbis_comment_add_tag(vorbis_comment *vc, const char *tag, const char *contents){
70 /* Length for key and value +2 for = and \0 */
71 char *comment=_ogg_malloc(strlen(tag)+strlen(contents)+2);
72 strcpy(comment, tag);
73 strcat(comment, "=");
74 strcat(comment, contents);
75 vorbis_comment_add(vc, comment);
76 _ogg_free(comment);
77}
78
79/* This is more or less the same as strncasecmp - but that doesn't exist
80 * everywhere, and this is a fairly trivial function, so we include it */
81static int tagcompare(const char *s1, const char *s2, int n){
82 int c=0;
83 while(c < n){
84 if(_v_toupper(s1[c]) != _v_toupper(s2[c]))
85 return !0;
86 c++;
87 }
88 return 0;
89}
90
91char *vorbis_comment_query(vorbis_comment *vc, const char *tag, int count){
92 long i;
93 int found = 0;
94 int taglen = strlen(tag)+1; /* +1 for the = we append */
95 char *fulltag = _ogg_malloc(taglen+1);
96
97 strcpy(fulltag, tag);
98 strcat(fulltag, "=");
99
100 for(i=0;i<vc->comments;i++){
101 if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
102 if(count == found) {
103 /* We return a pointer to the data, not a copy */
104 _ogg_free(fulltag);
105 return vc->user_comments[i] + taglen;
106 } else {
107 found++;
108 }
109 }
110 }
111 _ogg_free(fulltag);
112 return NULL; /* didn't find anything */
113}
114
115int vorbis_comment_query_count(vorbis_comment *vc, const char *tag){
116 int i,count=0;
117 int taglen = strlen(tag)+1; /* +1 for the = we append */
118 char *fulltag = _ogg_malloc(taglen+1);
119 strcpy(fulltag,tag);
120 strcat(fulltag, "=");
121
122 for(i=0;i<vc->comments;i++){
123 if(!tagcompare(vc->user_comments[i], fulltag, taglen))
124 count++;
125 }
126
127 _ogg_free(fulltag);
128 return count;
129}
130
131void vorbis_comment_clear(vorbis_comment *vc){
132 if(vc){
133 long i;
134 if(vc->user_comments){
135 for(i=0;i<vc->comments;i++)
136 if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
137 _ogg_free(vc->user_comments);
138 }
139 if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
140 if(vc->vendor)_ogg_free(vc->vendor);
141 memset(vc,0,sizeof(*vc));
142 }
143}
144
145/* blocksize 0 is guaranteed to be short, 1 is guaranteed to be long.
146 They may be equal, but short will never ge greater than long */
147int vorbis_info_blocksize(vorbis_info *vi,int zo){
148 codec_setup_info *ci = vi->codec_setup;
149 return ci ? ci->blocksizes[zo] : -1;
150}
151
152/* used by synthesis, which has a full, alloced vi */
153void vorbis_info_init(vorbis_info *vi){
154 memset(vi,0,sizeof(*vi));
155 vi->codec_setup=_ogg_calloc(1,sizeof(codec_setup_info));
156}
157
158void vorbis_info_clear(vorbis_info *vi){
159 codec_setup_info *ci=vi->codec_setup;
160 int i;
161
162 if(ci){
163
164 for(i=0;i<ci->modes;i++)
165 if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);
166
167 for(i=0;i<ci->maps;i++) /* unpack does the range checking */
168 if(ci->map_param[i]) /* this may be cleaning up an aborted
169 unpack, in which case the below type
170 cannot be trusted */
171 _mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
172
173 for(i=0;i<ci->floors;i++) /* unpack does the range checking */
174 if(ci->floor_param[i]) /* this may be cleaning up an aborted
175 unpack, in which case the below type
176 cannot be trusted */
177 _floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
178
179 for(i=0;i<ci->residues;i++) /* unpack does the range checking */
180 if(ci->residue_param[i]) /* this may be cleaning up an aborted
181 unpack, in which case the below type
182 cannot be trusted */
183 _residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);
184
185 for(i=0;i<ci->books;i++){
186 if(ci->book_param[i]){
187 /* knows if the book was not alloced */
188 vorbis_staticbook_destroy(ci->book_param[i]);
189 }
190 if(ci->fullbooks)
191 vorbis_book_clear(ci->fullbooks+i);
192 }
193 if(ci->fullbooks)
194 _ogg_free(ci->fullbooks);
195
196 for(i=0;i<ci->psys;i++)
197 _vi_psy_free(ci->psy_param[i]);
198
199 _ogg_free(ci);
200 }
201
202 memset(vi,0,sizeof(*vi));
203}
204
205/* Header packing/unpacking ********************************************/
206
207static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){
208 codec_setup_info *ci=vi->codec_setup;
209 int bs;
210 if(!ci)return(OV_EFAULT);
211
212 vi->version=oggpack_read(opb,32);
213 if(vi->version!=0)return(OV_EVERSION);
214
215 vi->channels=oggpack_read(opb,8);
216 vi->rate=oggpack_read(opb,32);
217
218 vi->bitrate_upper=(ogg_int32_t)oggpack_read(opb,32);
219 vi->bitrate_nominal=(ogg_int32_t)oggpack_read(opb,32);
220 vi->bitrate_lower=(ogg_int32_t)oggpack_read(opb,32);
221
222 bs = oggpack_read(opb,4);
223 if(bs<0)goto err_out;
224 ci->blocksizes[0]=1<<bs;
225 bs = oggpack_read(opb,4);
226 if(bs<0)goto err_out;
227 ci->blocksizes[1]=1<<bs;
228
229 if(vi->rate<1)goto err_out;
230 if(vi->channels<1)goto err_out;
231 if(ci->blocksizes[0]<64)goto err_out;
232 if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
233 if(ci->blocksizes[1]>8192)goto err_out;
234
235 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
236
237 return(0);
238 err_out:
239 vorbis_info_clear(vi);
240 return(OV_EBADHEADER);
241}
242
243static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){
244 int i;
245 int vendorlen=oggpack_read(opb,32);
246 if(vendorlen<0)goto err_out;
247 if(vendorlen>opb->storage-8)goto err_out;
248 vc->vendor=_ogg_calloc(vendorlen+1,1);
249 _v_readstring(opb,vc->vendor,vendorlen);
250 i=oggpack_read(opb,32);
251 if(i<0)goto err_out;
252 if(i>((opb->storage-oggpack_bytes(opb))>>2))goto err_out;
253 vc->comments=i;
254 vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
255 vc->comment_lengths=_ogg_calloc(vc->comments+1, sizeof(*vc->comment_lengths));
256
257 for(i=0;i<vc->comments;i++){
258 int len=oggpack_read(opb,32);
259 if(len<0)goto err_out;
260 if(len>opb->storage-oggpack_bytes(opb))goto err_out;
261 vc->comment_lengths[i]=len;
262 vc->user_comments[i]=_ogg_calloc(len+1,1);
263 _v_readstring(opb,vc->user_comments[i],len);
264 }
265 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
266
267 return(0);
268 err_out:
269 vorbis_comment_clear(vc);
270 return(OV_EBADHEADER);
271}
272
273/* all of the real encoding details are here. The modes, books,
274 everything */
275static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
276 codec_setup_info *ci=vi->codec_setup;
277 int i;
278
279 /* codebooks */
280 ci->books=oggpack_read(opb,8)+1;
281 if(ci->books<=0)goto err_out;
282 for(i=0;i<ci->books;i++){
283 ci->book_param[i]=vorbis_staticbook_unpack(opb);
284 if(!ci->book_param[i])goto err_out;
285 }
286
287 /* time backend settings; hooks are unused */
288 {
289 int times=oggpack_read(opb,6)+1;
290 if(times<=0)goto err_out;
291 for(i=0;i<times;i++){
292 int test=oggpack_read(opb,16);
293 if(test<0 || test>=VI_TIMEB)goto err_out;
294 }
295 }
296
297 /* floor backend settings */
298 ci->floors=oggpack_read(opb,6)+1;
299 if(ci->floors<=0)goto err_out;
300 for(i=0;i<ci->floors;i++){
301 ci->floor_type[i]=oggpack_read(opb,16);
302 if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
303 ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
304 if(!ci->floor_param[i])goto err_out;
305 }
306
307 /* residue backend settings */
308 ci->residues=oggpack_read(opb,6)+1;
309 if(ci->residues<=0)goto err_out;
310 for(i=0;i<ci->residues;i++){
311 ci->residue_type[i]=oggpack_read(opb,16);
312 if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out;
313 ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
314 if(!ci->residue_param[i])goto err_out;
315 }
316
317 /* map backend settings */
318 ci->maps=oggpack_read(opb,6)+1;
319 if(ci->maps<=0)goto err_out;
320 for(i=0;i<ci->maps;i++){
321 ci->map_type[i]=oggpack_read(opb,16);
322 if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out;
323 ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
324 if(!ci->map_param[i])goto err_out;
325 }
326
327 /* mode settings */
328 ci->modes=oggpack_read(opb,6)+1;
329 if(ci->modes<=0)goto err_out;
330 for(i=0;i<ci->modes;i++){
331 ci->mode_param[i]=_ogg_calloc(1,sizeof(*ci->mode_param[i]));
332 ci->mode_param[i]->blockflag=oggpack_read(opb,1);
333 ci->mode_param[i]->windowtype=oggpack_read(opb,16);
334 ci->mode_param[i]->transformtype=oggpack_read(opb,16);
335 ci->mode_param[i]->mapping=oggpack_read(opb,8);
336
337 if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
338 if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
339 if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
340 if(ci->mode_param[i]->mapping<0)goto err_out;
341 }
342
343 if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */
344
345 return(0);
346 err_out:
347 vorbis_info_clear(vi);
348 return(OV_EBADHEADER);
349}
350
351/* Is this packet a vorbis ID header? */
352int vorbis_synthesis_idheader(ogg_packet *op){
353 oggpack_buffer opb;
354 char buffer[6];
355
356 if(op){
357 oggpack_readinit(&opb,op->packet,op->bytes);
358
359 if(!op->b_o_s)
360 return(0); /* Not the initial packet */
361
362 if(oggpack_read(&opb,8) != 1)
363 return 0; /* not an ID header */
364
365 memset(buffer,0,6);
366 _v_readstring(&opb,buffer,6);
367 if(memcmp(buffer,"vorbis",6))
368 return 0; /* not vorbis */
369
370 return 1;
371 }
372
373 return 0;
374}
375
376/* The Vorbis header is in three packets; the initial small packet in
377 the first page that identifies basic parameters, a second packet
378 with bitstream comments and a third packet that holds the
379 codebook. */
380
381int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
382 oggpack_buffer opb;
383
384 if(op){
385 oggpack_readinit(&opb,op->packet,op->bytes);
386
387 /* Which of the three types of header is this? */
388 /* Also verify header-ness, vorbis */
389 {
390 char buffer[6];
391 int packtype=oggpack_read(&opb,8);
392 memset(buffer,0,6);
393 _v_readstring(&opb,buffer,6);
394 if(memcmp(buffer,"vorbis",6)){
395 /* not a vorbis header */
396 return(OV_ENOTVORBIS);
397 }
398 switch(packtype){
399 case 0x01: /* least significant *bit* is read first */
400 if(!op->b_o_s){
401 /* Not the initial packet */
402 return(OV_EBADHEADER);
403 }
404 if(vi->rate!=0){
405 /* previously initialized info header */
406 return(OV_EBADHEADER);
407 }
408
409 return(_vorbis_unpack_info(vi,&opb));
410
411 case 0x03: /* least significant *bit* is read first */
412 if(vi->rate==0){
413 /* um... we didn't get the initial header */
414 return(OV_EBADHEADER);
415 }
416 if(vc->vendor!=NULL){
417 /* previously initialized comment header */
418 return(OV_EBADHEADER);
419 }
420
421 return(_vorbis_unpack_comment(vc,&opb));
422
423 case 0x05: /* least significant *bit* is read first */
424 if(vi->rate==0 || vc->vendor==NULL){
425 /* um... we didn;t get the initial header or comments yet */
426 return(OV_EBADHEADER);
427 }
428 if(vi->codec_setup==NULL){
429 /* improperly initialized vorbis_info */
430 return(OV_EFAULT);
431 }
432 if(((codec_setup_info *)vi->codec_setup)->books>0){
433 /* previously initialized setup header */
434 return(OV_EBADHEADER);
435 }
436
437 return(_vorbis_unpack_books(vi,&opb));
438
439 default:
440 /* Not a valid vorbis header type */
441 return(OV_EBADHEADER);
442 break;
443 }
444 }
445 }
446 return(OV_EBADHEADER);
447}
448
449/* pack side **********************************************************/
450
451static int _vorbis_pack_info(oggpack_buffer *opb,vorbis_info *vi){
452 codec_setup_info *ci=vi->codec_setup;
453 if(!ci||
454 ci->blocksizes[0]<64||
455 ci->blocksizes[1]<ci->blocksizes[0]){
456 return(OV_EFAULT);
457 }
458
459 /* preamble */
460 oggpack_write(opb,0x01,8);
461 _v_writestring(opb,"vorbis", 6);
462
463 /* basic information about the stream */
464 oggpack_write(opb,0x00,32);
465 oggpack_write(opb,vi->channels,8);
466 oggpack_write(opb,vi->rate,32);
467
468 oggpack_write(opb,vi->bitrate_upper,32);
469 oggpack_write(opb,vi->bitrate_nominal,32);
470 oggpack_write(opb,vi->bitrate_lower,32);
471
472 oggpack_write(opb,ov_ilog(ci->blocksizes[0]-1),4);
473 oggpack_write(opb,ov_ilog(ci->blocksizes[1]-1),4);
474 oggpack_write(opb,1,1);
475
476 return(0);
477}
478
479static int _vorbis_pack_comment(oggpack_buffer *opb,vorbis_comment *vc){
480 int bytes = strlen(ENCODE_VENDOR_STRING);
481
482 /* preamble */
483 oggpack_write(opb,0x03,8);
484 _v_writestring(opb,"vorbis", 6);
485
486 /* vendor */
487 oggpack_write(opb,bytes,32);
488 _v_writestring(opb,ENCODE_VENDOR_STRING, bytes);
489
490 /* comments */
491
492 oggpack_write(opb,vc->comments,32);
493 if(vc->comments){
494 int i;
495 for(i=0;i<vc->comments;i++){
496 if(vc->user_comments[i]){
497 oggpack_write(opb,vc->comment_lengths[i],32);
498 _v_writestring(opb,vc->user_comments[i], vc->comment_lengths[i]);
499 }else{
500 oggpack_write(opb,0,32);
501 }
502 }
503 }
504 oggpack_write(opb,1,1);
505
506 return(0);
507}
508
509static int _vorbis_pack_books(oggpack_buffer *opb,vorbis_info *vi){
510 codec_setup_info *ci=vi->codec_setup;
511 int i;
512 if(!ci)return(OV_EFAULT);
513
514 oggpack_write(opb,0x05,8);
515 _v_writestring(opb,"vorbis", 6);
516
517 /* books */
518 oggpack_write(opb,ci->books-1,8);
519 for(i=0;i<ci->books;i++)
520 if(vorbis_staticbook_pack(ci->book_param[i],opb))goto err_out;
521
522 /* times; hook placeholders */
523 oggpack_write(opb,0,6);
524 oggpack_write(opb,0,16);
525
526 /* floors */
527 oggpack_write(opb,ci->floors-1,6);
528 for(i=0;i<ci->floors;i++){
529 oggpack_write(opb,ci->floor_type[i],16);
530 if(_floor_P[ci->floor_type[i]]->pack)
531 _floor_P[ci->floor_type[i]]->pack(ci->floor_param[i],opb);
532 else
533 goto err_out;
534 }
535
536 /* residues */
537 oggpack_write(opb,ci->residues-1,6);
538 for(i=0;i<ci->residues;i++){
539 oggpack_write(opb,ci->residue_type[i],16);
540 _residue_P[ci->residue_type[i]]->pack(ci->residue_param[i],opb);
541 }
542
543 /* maps */
544 oggpack_write(opb,ci->maps-1,6);
545 for(i=0;i<ci->maps;i++){
546 oggpack_write(opb,ci->map_type[i],16);
547 _mapping_P[ci->map_type[i]]->pack(vi,ci->map_param[i],opb);
548 }
549
550 /* modes */
551 oggpack_write(opb,ci->modes-1,6);
552 for(i=0;i<ci->modes;i++){
553 oggpack_write(opb,ci->mode_param[i]->blockflag,1);
554 oggpack_write(opb,ci->mode_param[i]->windowtype,16);
555 oggpack_write(opb,ci->mode_param[i]->transformtype,16);
556 oggpack_write(opb,ci->mode_param[i]->mapping,8);
557 }
558 oggpack_write(opb,1,1);
559
560 return(0);
561err_out:
562 return(-1);
563}
564
565int vorbis_commentheader_out(vorbis_comment *vc,
566 ogg_packet *op){
567
568 oggpack_buffer opb;
569
570 oggpack_writeinit(&opb);
571 if(_vorbis_pack_comment(&opb,vc)){
572 oggpack_writeclear(&opb);
573 return OV_EIMPL;
574 }
575
576 op->packet = _ogg_malloc(oggpack_bytes(&opb));
577 memcpy(op->packet, opb.buffer, oggpack_bytes(&opb));
578
579 op->bytes=oggpack_bytes(&opb);
580 op->b_o_s=0;
581 op->e_o_s=0;
582 op->granulepos=0;
583 op->packetno=1;
584
585 oggpack_writeclear(&opb);
586 return 0;
587}
588
589int vorbis_analysis_headerout(vorbis_dsp_state *v,
590 vorbis_comment *vc,
591 ogg_packet *op,
592 ogg_packet *op_comm,
593 ogg_packet *op_code){
594 int ret=OV_EIMPL;
595 vorbis_info *vi=v->vi;
596 oggpack_buffer opb;
597 private_state *b=v->backend_state;
598
599 if(!b||vi->channels<=0||vi->channels>256){
600 b = NULL;
601 ret=OV_EFAULT;
602 goto err_out;
603 }
604
605 /* first header packet **********************************************/
606
607 oggpack_writeinit(&opb);
608 if(_vorbis_pack_info(&opb,vi))goto err_out;
609
610 /* build the packet */
611 if(b->header)_ogg_free(b->header);
612 b->header=_ogg_malloc(oggpack_bytes(&opb));
613 memcpy(b->header,opb.buffer,oggpack_bytes(&opb));
614 op->packet=b->header;
615 op->bytes=oggpack_bytes(&opb);
616 op->b_o_s=1;
617 op->e_o_s=0;
618 op->granulepos=0;
619 op->packetno=0;
620
621 /* second header packet (comments) **********************************/
622
623 oggpack_reset(&opb);
624 if(_vorbis_pack_comment(&opb,vc))goto err_out;
625
626 if(b->header1)_ogg_free(b->header1);
627 b->header1=_ogg_malloc(oggpack_bytes(&opb));
628 memcpy(b->header1,opb.buffer,oggpack_bytes(&opb));
629 op_comm->packet=b->header1;
630 op_comm->bytes=oggpack_bytes(&opb);
631 op_comm->b_o_s=0;
632 op_comm->e_o_s=0;
633 op_comm->granulepos=0;
634 op_comm->packetno=1;
635
636 /* third header packet (modes/codebooks) ****************************/
637
638 oggpack_reset(&opb);
639 if(_vorbis_pack_books(&opb,vi))goto err_out;
640
641 if(b->header2)_ogg_free(b->header2);
642 b->header2=_ogg_malloc(oggpack_bytes(&opb));
643 memcpy(b->header2,opb.buffer,oggpack_bytes(&opb));
644 op_code->packet=b->header2;
645 op_code->bytes=oggpack_bytes(&opb);
646 op_code->b_o_s=0;
647 op_code->e_o_s=0;
648 op_code->granulepos=0;
649 op_code->packetno=2;
650
651 oggpack_writeclear(&opb);
652 return(0);
653 err_out:
654 memset(op,0,sizeof(*op));
655 memset(op_comm,0,sizeof(*op_comm));
656 memset(op_code,0,sizeof(*op_code));
657
658 if(b){
659 if(vi->channels>0)oggpack_writeclear(&opb);
660 if(b->header)_ogg_free(b->header);
661 if(b->header1)_ogg_free(b->header1);
662 if(b->header2)_ogg_free(b->header2);
663 b->header=NULL;
664 b->header1=NULL;
665 b->header2=NULL;
666 }
667 return(ret);
668}
669
670double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){
671 if(granulepos == -1) return -1;
672
673 /* We're not guaranteed a 64 bit unsigned type everywhere, so we
674 have to put the unsigned granpo in a signed type. */
675 if(granulepos>=0){
676 return((double)granulepos/v->vi->rate);
677 }else{
678 ogg_int64_t granuleoff=0xffffffff;
679 granuleoff<<=31;
680 granuleoff|=0x7ffffffff;
681 return(((double)granulepos+2+granuleoff+granuleoff)/v->vi->rate);
682 }
683}
684
685const char *vorbis_version_string(void){
686 return GENERAL_VENDOR_STRING;
687}
688