media/libvorbis/lib/vorbis_info.c@97036ab72558
media/libvorbis/lib/vorbis_info.c
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
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: maintain the info structure, info <-> header packets
14 last mod: $Id: info.c 19058 2014-01-22 18:03:15Z xiphmont $
16 ********************************************************************/
18 /* general handling of the header and the vorbis_info structure (and
19 substructures) */
21 #include <stdlib.h>
22 #include <string.h>
23 #include <ctype.h>
24 #include <ogg/ogg.h>
25 #include "vorbis/codec.h"
26 #include "codec_internal.h"
27 #include "codebook.h"
28 #include "registry.h"
29 #include "window.h"
30 #include "psy.h"
31 #include "misc.h"
32 #include "os.h"
34 #define GENERAL_VENDOR_STRING "Xiph.Org libVorbis 1.3.4"
35 #define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20140122 (Turpakäräjiin)"
37 /* helpers */
38 static int ilog2(unsigned int v){
39 int ret=0;
40 if(v)--v;
41 while(v){
42 ret++;
43 v>>=1;
44 }
45 return(ret);
46 }
48 static void _v_writestring(oggpack_buffer *o,const char *s, int bytes){
50 while(bytes--){
51 oggpack_write(o,*s++,8);
52 }
53 }
55 static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
56 while(bytes--){
57 *buf++=oggpack_read(o,8);
58 }
59 }
61 void vorbis_comment_init(vorbis_comment *vc){
62 memset(vc,0,sizeof(*vc));
63 }
65 void vorbis_comment_add(vorbis_comment *vc,const char *comment){
66 vc->user_comments=_ogg_realloc(vc->user_comments,
67 (vc->comments+2)*sizeof(*vc->user_comments));
68 vc->comment_lengths=_ogg_realloc(vc->comment_lengths,
69 (vc->comments+2)*sizeof(*vc->comment_lengths));
70 vc->comment_lengths[vc->comments]=strlen(comment);
71 vc->user_comments[vc->comments]=_ogg_malloc(vc->comment_lengths[vc->comments]+1);
72 strcpy(vc->user_comments[vc->comments], comment);
73 vc->comments++;
74 vc->user_comments[vc->comments]=NULL;
75 }
77 void vorbis_comment_add_tag(vorbis_comment *vc, const char *tag, const char *contents){
78 char *comment=alloca(strlen(tag)+strlen(contents)+2); /* +2 for = and \0 */
79 strcpy(comment, tag);
80 strcat(comment, "=");
81 strcat(comment, contents);
82 vorbis_comment_add(vc, comment);
83 }
85 /* This is more or less the same as strncasecmp - but that doesn't exist
86 * everywhere, and this is a fairly trivial function, so we include it */
87 static int tagcompare(const char *s1, const char *s2, int n){
88 int c=0;
89 while(c < n){
90 if(toupper(s1[c]) != toupper(s2[c]))
91 return !0;
92 c++;
93 }
94 return 0;
95 }
97 char *vorbis_comment_query(vorbis_comment *vc, const char *tag, int count){
98 long i;
99 int found = 0;
100 int taglen = strlen(tag)+1; /* +1 for the = we append */
101 char *fulltag = alloca(taglen+ 1);
103 strcpy(fulltag, tag);
104 strcat(fulltag, "=");
106 for(i=0;i<vc->comments;i++){
107 if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
108 if(count == found)
109 /* We return a pointer to the data, not a copy */
110 return vc->user_comments[i] + taglen;
111 else
112 found++;
113 }
114 }
115 return NULL; /* didn't find anything */
116 }
118 int vorbis_comment_query_count(vorbis_comment *vc, const char *tag){
119 int i,count=0;
120 int taglen = strlen(tag)+1; /* +1 for the = we append */
121 char *fulltag = alloca(taglen+1);
122 strcpy(fulltag,tag);
123 strcat(fulltag, "=");
125 for(i=0;i<vc->comments;i++){
126 if(!tagcompare(vc->user_comments[i], fulltag, taglen))
127 count++;
128 }
130 return count;
131 }
133 void vorbis_comment_clear(vorbis_comment *vc){
134 if(vc){
135 long i;
136 if(vc->user_comments){
137 for(i=0;i<vc->comments;i++)
138 if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
139 _ogg_free(vc->user_comments);
140 }
141 if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
142 if(vc->vendor)_ogg_free(vc->vendor);
143 memset(vc,0,sizeof(*vc));
144 }
145 }
147 /* blocksize 0 is guaranteed to be short, 1 is guaranteed to be long.
148 They may be equal, but short will never ge greater than long */
149 int vorbis_info_blocksize(vorbis_info *vi,int zo){
150 codec_setup_info *ci = vi->codec_setup;
151 return ci ? ci->blocksizes[zo] : -1;
152 }
154 /* used by synthesis, which has a full, alloced vi */
155 void vorbis_info_init(vorbis_info *vi){
156 memset(vi,0,sizeof(*vi));
157 vi->codec_setup=_ogg_calloc(1,sizeof(codec_setup_info));
158 }
160 void vorbis_info_clear(vorbis_info *vi){
161 codec_setup_info *ci=vi->codec_setup;
162 int i;
164 if(ci){
166 for(i=0;i<ci->modes;i++)
167 if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);
169 for(i=0;i<ci->maps;i++) /* unpack does the range checking */
170 if(ci->map_param[i]) /* this may be cleaning up an aborted
171 unpack, in which case the below type
172 cannot be trusted */
173 _mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
175 for(i=0;i<ci->floors;i++) /* unpack does the range checking */
176 if(ci->floor_param[i]) /* this may be cleaning up an aborted
177 unpack, in which case the below type
178 cannot be trusted */
179 _floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
181 for(i=0;i<ci->residues;i++) /* unpack does the range checking */
182 if(ci->residue_param[i]) /* this may be cleaning up an aborted
183 unpack, in which case the below type
184 cannot be trusted */
185 _residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);
187 for(i=0;i<ci->books;i++){
188 if(ci->book_param[i]){
189 /* knows if the book was not alloced */
190 vorbis_staticbook_destroy(ci->book_param[i]);
191 }
192 if(ci->fullbooks)
193 vorbis_book_clear(ci->fullbooks+i);
194 }
195 if(ci->fullbooks)
196 _ogg_free(ci->fullbooks);
198 for(i=0;i<ci->psys;i++)
199 _vi_psy_free(ci->psy_param[i]);
201 _ogg_free(ci);
202 }
204 memset(vi,0,sizeof(*vi));
205 }
207 /* Header packing/unpacking ********************************************/
209 static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){
210 codec_setup_info *ci=vi->codec_setup;
211 if(!ci)return(OV_EFAULT);
213 vi->version=oggpack_read(opb,32);
214 if(vi->version!=0)return(OV_EVERSION);
216 vi->channels=oggpack_read(opb,8);
217 vi->rate=oggpack_read(opb,32);
219 vi->bitrate_upper=oggpack_read(opb,32);
220 vi->bitrate_nominal=oggpack_read(opb,32);
221 vi->bitrate_lower=oggpack_read(opb,32);
223 ci->blocksizes[0]=1<<oggpack_read(opb,4);
224 ci->blocksizes[1]=1<<oggpack_read(opb,4);
226 if(vi->rate<1)goto err_out;
227 if(vi->channels<1)goto err_out;
228 if(ci->blocksizes[0]<64)goto err_out;
229 if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
230 if(ci->blocksizes[1]>8192)goto err_out;
232 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
234 return(0);
235 err_out:
236 vorbis_info_clear(vi);
237 return(OV_EBADHEADER);
238 }
240 static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){
241 int i;
242 int vendorlen=oggpack_read(opb,32);
243 if(vendorlen<0)goto err_out;
244 if(vendorlen>opb->storage-8)goto err_out;
245 vc->vendor=_ogg_calloc(vendorlen+1,1);
246 _v_readstring(opb,vc->vendor,vendorlen);
247 i=oggpack_read(opb,32);
248 if(i<0)goto err_out;
249 if(i>((opb->storage-oggpack_bytes(opb))>>2))goto err_out;
250 vc->comments=i;
251 vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
252 vc->comment_lengths=_ogg_calloc(vc->comments+1, sizeof(*vc->comment_lengths));
254 for(i=0;i<vc->comments;i++){
255 int len=oggpack_read(opb,32);
256 if(len<0)goto err_out;
257 if(len>opb->storage-oggpack_bytes(opb))goto err_out;
258 vc->comment_lengths[i]=len;
259 vc->user_comments[i]=_ogg_calloc(len+1,1);
260 _v_readstring(opb,vc->user_comments[i],len);
261 }
262 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
264 return(0);
265 err_out:
266 vorbis_comment_clear(vc);
267 return(OV_EBADHEADER);
268 }
270 /* all of the real encoding details are here. The modes, books,
271 everything */
272 static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
273 codec_setup_info *ci=vi->codec_setup;
274 int i;
275 if(!ci)return(OV_EFAULT);
277 /* codebooks */
278 ci->books=oggpack_read(opb,8)+1;
279 if(ci->books<=0)goto err_out;
280 for(i=0;i<ci->books;i++){
281 ci->book_param[i]=vorbis_staticbook_unpack(opb);
282 if(!ci->book_param[i])goto err_out;
283 }
285 /* time backend settings; hooks are unused */
286 {
287 int times=oggpack_read(opb,6)+1;
288 if(times<=0)goto err_out;
289 for(i=0;i<times;i++){
290 int test=oggpack_read(opb,16);
291 if(test<0 || test>=VI_TIMEB)goto err_out;
292 }
293 }
295 /* floor backend settings */
296 ci->floors=oggpack_read(opb,6)+1;
297 if(ci->floors<=0)goto err_out;
298 for(i=0;i<ci->floors;i++){
299 ci->floor_type[i]=oggpack_read(opb,16);
300 if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
301 ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
302 if(!ci->floor_param[i])goto err_out;
303 }
305 /* residue backend settings */
306 ci->residues=oggpack_read(opb,6)+1;
307 if(ci->residues<=0)goto err_out;
308 for(i=0;i<ci->residues;i++){
309 ci->residue_type[i]=oggpack_read(opb,16);
310 if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out;
311 ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
312 if(!ci->residue_param[i])goto err_out;
313 }
315 /* map backend settings */
316 ci->maps=oggpack_read(opb,6)+1;
317 if(ci->maps<=0)goto err_out;
318 for(i=0;i<ci->maps;i++){
319 ci->map_type[i]=oggpack_read(opb,16);
320 if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out;
321 ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
322 if(!ci->map_param[i])goto err_out;
323 }
325 /* mode settings */
326 ci->modes=oggpack_read(opb,6)+1;
327 if(ci->modes<=0)goto err_out;
328 for(i=0;i<ci->modes;i++){
329 ci->mode_param[i]=_ogg_calloc(1,sizeof(*ci->mode_param[i]));
330 ci->mode_param[i]->blockflag=oggpack_read(opb,1);
331 ci->mode_param[i]->windowtype=oggpack_read(opb,16);
332 ci->mode_param[i]->transformtype=oggpack_read(opb,16);
333 ci->mode_param[i]->mapping=oggpack_read(opb,8);
335 if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
336 if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
337 if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
338 if(ci->mode_param[i]->mapping<0)goto err_out;
339 }
341 if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */
343 return(0);
344 err_out:
345 vorbis_info_clear(vi);
346 return(OV_EBADHEADER);
347 }
349 /* Is this packet a vorbis ID header? */
350 int vorbis_synthesis_idheader(ogg_packet *op){
351 oggpack_buffer opb;
352 char buffer[6];
354 if(op){
355 oggpack_readinit(&opb,op->packet,op->bytes);
357 if(!op->b_o_s)
358 return(0); /* Not the initial packet */
360 if(oggpack_read(&opb,8) != 1)
361 return 0; /* not an ID header */
363 memset(buffer,0,6);
364 _v_readstring(&opb,buffer,6);
365 if(memcmp(buffer,"vorbis",6))
366 return 0; /* not vorbis */
368 return 1;
369 }
371 return 0;
372 }
374 /* The Vorbis header is in three packets; the initial small packet in
375 the first page that identifies basic parameters, a second packet
376 with bitstream comments and a third packet that holds the
377 codebook. */
379 int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
380 oggpack_buffer opb;
382 if(op){
383 oggpack_readinit(&opb,op->packet,op->bytes);
385 /* Which of the three types of header is this? */
386 /* Also verify header-ness, vorbis */
387 {
388 char buffer[6];
389 int packtype=oggpack_read(&opb,8);
390 memset(buffer,0,6);
391 _v_readstring(&opb,buffer,6);
392 if(memcmp(buffer,"vorbis",6)){
393 /* not a vorbis header */
394 return(OV_ENOTVORBIS);
395 }
396 switch(packtype){
397 case 0x01: /* least significant *bit* is read first */
398 if(!op->b_o_s){
399 /* Not the initial packet */
400 return(OV_EBADHEADER);
401 }
402 if(vi->rate!=0){
403 /* previously initialized info header */
404 return(OV_EBADHEADER);
405 }
407 return(_vorbis_unpack_info(vi,&opb));
409 case 0x03: /* least significant *bit* is read first */
410 if(vi->rate==0){
411 /* um... we didn't get the initial header */
412 return(OV_EBADHEADER);
413 }
415 return(_vorbis_unpack_comment(vc,&opb));
417 case 0x05: /* least significant *bit* is read first */
418 if(vi->rate==0 || vc->vendor==NULL){
419 /* um... we didn;t get the initial header or comments yet */
420 return(OV_EBADHEADER);
421 }
423 return(_vorbis_unpack_books(vi,&opb));
425 default:
426 /* Not a valid vorbis header type */
427 return(OV_EBADHEADER);
428 break;
429 }
430 }
431 }
432 return(OV_EBADHEADER);
433 }
435 /* pack side **********************************************************/
437 static int _vorbis_pack_info(oggpack_buffer *opb,vorbis_info *vi){
438 codec_setup_info *ci=vi->codec_setup;
439 if(!ci)return(OV_EFAULT);
441 /* preamble */
442 oggpack_write(opb,0x01,8);
443 _v_writestring(opb,"vorbis", 6);
445 /* basic information about the stream */
446 oggpack_write(opb,0x00,32);
447 oggpack_write(opb,vi->channels,8);
448 oggpack_write(opb,vi->rate,32);
450 oggpack_write(opb,vi->bitrate_upper,32);
451 oggpack_write(opb,vi->bitrate_nominal,32);
452 oggpack_write(opb,vi->bitrate_lower,32);
454 oggpack_write(opb,ilog2(ci->blocksizes[0]),4);
455 oggpack_write(opb,ilog2(ci->blocksizes[1]),4);
456 oggpack_write(opb,1,1);
458 return(0);
459 }
461 static int _vorbis_pack_comment(oggpack_buffer *opb,vorbis_comment *vc){
462 int bytes = strlen(ENCODE_VENDOR_STRING);
464 /* preamble */
465 oggpack_write(opb,0x03,8);
466 _v_writestring(opb,"vorbis", 6);
468 /* vendor */
469 oggpack_write(opb,bytes,32);
470 _v_writestring(opb,ENCODE_VENDOR_STRING, bytes);
472 /* comments */
474 oggpack_write(opb,vc->comments,32);
475 if(vc->comments){
476 int i;
477 for(i=0;i<vc->comments;i++){
478 if(vc->user_comments[i]){
479 oggpack_write(opb,vc->comment_lengths[i],32);
480 _v_writestring(opb,vc->user_comments[i], vc->comment_lengths[i]);
481 }else{
482 oggpack_write(opb,0,32);
483 }
484 }
485 }
486 oggpack_write(opb,1,1);
488 return(0);
489 }
491 static int _vorbis_pack_books(oggpack_buffer *opb,vorbis_info *vi){
492 codec_setup_info *ci=vi->codec_setup;
493 int i;
494 if(!ci)return(OV_EFAULT);
496 oggpack_write(opb,0x05,8);
497 _v_writestring(opb,"vorbis", 6);
499 /* books */
500 oggpack_write(opb,ci->books-1,8);
501 for(i=0;i<ci->books;i++)
502 if(vorbis_staticbook_pack(ci->book_param[i],opb))goto err_out;
504 /* times; hook placeholders */
505 oggpack_write(opb,0,6);
506 oggpack_write(opb,0,16);
508 /* floors */
509 oggpack_write(opb,ci->floors-1,6);
510 for(i=0;i<ci->floors;i++){
511 oggpack_write(opb,ci->floor_type[i],16);
512 if(_floor_P[ci->floor_type[i]]->pack)
513 _floor_P[ci->floor_type[i]]->pack(ci->floor_param[i],opb);
514 else
515 goto err_out;
516 }
518 /* residues */
519 oggpack_write(opb,ci->residues-1,6);
520 for(i=0;i<ci->residues;i++){
521 oggpack_write(opb,ci->residue_type[i],16);
522 _residue_P[ci->residue_type[i]]->pack(ci->residue_param[i],opb);
523 }
525 /* maps */
526 oggpack_write(opb,ci->maps-1,6);
527 for(i=0;i<ci->maps;i++){
528 oggpack_write(opb,ci->map_type[i],16);
529 _mapping_P[ci->map_type[i]]->pack(vi,ci->map_param[i],opb);
530 }
532 /* modes */
533 oggpack_write(opb,ci->modes-1,6);
534 for(i=0;i<ci->modes;i++){
535 oggpack_write(opb,ci->mode_param[i]->blockflag,1);
536 oggpack_write(opb,ci->mode_param[i]->windowtype,16);
537 oggpack_write(opb,ci->mode_param[i]->transformtype,16);
538 oggpack_write(opb,ci->mode_param[i]->mapping,8);
539 }
540 oggpack_write(opb,1,1);
542 return(0);
543 err_out:
544 return(-1);
545 }
547 int vorbis_commentheader_out(vorbis_comment *vc,
548 ogg_packet *op){
550 oggpack_buffer opb;
552 oggpack_writeinit(&opb);
553 if(_vorbis_pack_comment(&opb,vc)){
554 oggpack_writeclear(&opb);
555 return OV_EIMPL;
556 }
558 op->packet = _ogg_malloc(oggpack_bytes(&opb));
559 memcpy(op->packet, opb.buffer, oggpack_bytes(&opb));
561 op->bytes=oggpack_bytes(&opb);
562 op->b_o_s=0;
563 op->e_o_s=0;
564 op->granulepos=0;
565 op->packetno=1;
567 oggpack_writeclear(&opb);
568 return 0;
569 }
571 int vorbis_analysis_headerout(vorbis_dsp_state *v,
572 vorbis_comment *vc,
573 ogg_packet *op,
574 ogg_packet *op_comm,
575 ogg_packet *op_code){
576 int ret=OV_EIMPL;
577 vorbis_info *vi=v->vi;
578 oggpack_buffer opb;
579 private_state *b=v->backend_state;
581 if(!b){
582 ret=OV_EFAULT;
583 goto err_out;
584 }
586 /* first header packet **********************************************/
588 oggpack_writeinit(&opb);
589 if(_vorbis_pack_info(&opb,vi))goto err_out;
591 /* build the packet */
592 if(b->header)_ogg_free(b->header);
593 b->header=_ogg_malloc(oggpack_bytes(&opb));
594 memcpy(b->header,opb.buffer,oggpack_bytes(&opb));
595 op->packet=b->header;
596 op->bytes=oggpack_bytes(&opb);
597 op->b_o_s=1;
598 op->e_o_s=0;
599 op->granulepos=0;
600 op->packetno=0;
602 /* second header packet (comments) **********************************/
604 oggpack_reset(&opb);
605 if(_vorbis_pack_comment(&opb,vc))goto err_out;
607 if(b->header1)_ogg_free(b->header1);
608 b->header1=_ogg_malloc(oggpack_bytes(&opb));
609 memcpy(b->header1,opb.buffer,oggpack_bytes(&opb));
610 op_comm->packet=b->header1;
611 op_comm->bytes=oggpack_bytes(&opb);
612 op_comm->b_o_s=0;
613 op_comm->e_o_s=0;
614 op_comm->granulepos=0;
615 op_comm->packetno=1;
617 /* third header packet (modes/codebooks) ****************************/
619 oggpack_reset(&opb);
620 if(_vorbis_pack_books(&opb,vi))goto err_out;
622 if(b->header2)_ogg_free(b->header2);
623 b->header2=_ogg_malloc(oggpack_bytes(&opb));
624 memcpy(b->header2,opb.buffer,oggpack_bytes(&opb));
625 op_code->packet=b->header2;
626 op_code->bytes=oggpack_bytes(&opb);
627 op_code->b_o_s=0;
628 op_code->e_o_s=0;
629 op_code->granulepos=0;
630 op_code->packetno=2;
632 oggpack_writeclear(&opb);
633 return(0);
634 err_out:
635 memset(op,0,sizeof(*op));
636 memset(op_comm,0,sizeof(*op_comm));
637 memset(op_code,0,sizeof(*op_code));
639 if(b){
640 oggpack_writeclear(&opb);
641 if(b->header)_ogg_free(b->header);
642 if(b->header1)_ogg_free(b->header1);
643 if(b->header2)_ogg_free(b->header2);
644 b->header=NULL;
645 b->header1=NULL;
646 b->header2=NULL;
647 }
648 return(ret);
649 }
651 double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){
652 if(granulepos == -1) return -1;
654 /* We're not guaranteed a 64 bit unsigned type everywhere, so we
655 have to put the unsigned granpo in a signed type. */
656 if(granulepos>=0){
657 return((double)granulepos/v->vi->rate);
658 }else{
659 ogg_int64_t granuleoff=0xffffffff;
660 granuleoff<<=31;
661 granuleoff|=0x7ffffffff;
662 return(((double)granulepos+2+granuleoff+granuleoff)/v->vi->rate);
663 }
664 }
666 const char *vorbis_version_string(void){
667 return GENERAL_VENDOR_STRING;
668 }
