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 1994-2003 *
9 * by the XIPHOPHORUS Company http://www.xiph.org/ *
10 * *
11 ********************************************************************
12
13 function: maintain the info structure, info <-> header packets
14 last mod: $Id: info.c 9513 2005-06-26 18:36:49Z giles $
15
16 ********************************************************************/
17
18 /* general handling of the header and the vorbis_info structure (and
19 substructures) */
20
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"
33
34 /* helpers */
ilog2(unsigned int v)35 static int ilog2(unsigned int v){
36 int ret=0;
37 if(v)--v;
38 while(v){
39 ret++;
40 v>>=1;
41 }
42 return(ret);
43 }
44
_v_writestring(oggpack_buffer * o,char * s,int bytes)45 static void _v_writestring(oggpack_buffer *o,char *s, int bytes){
46
47 while(bytes--){
48 oggpack_write(o,*s++,8);
49 }
50 }
51
_v_readstring(oggpack_buffer * o,char * buf,int bytes)52 static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
53 while(bytes--){
54 *buf++=oggpack_read(o,8);
55 }
56 }
57
vorbis_comment_init(vorbis_comment * vc)58 void vorbis_comment_init(vorbis_comment *vc){
59 memset(vc,0,sizeof(*vc));
60 }
61
vorbis_comment_add(vorbis_comment * vc,char * comment)62 void vorbis_comment_add(vorbis_comment *vc,char *comment){
63 vc->user_comments=_ogg_realloc(vc->user_comments,
64 (vc->comments+2)*sizeof(*vc->user_comments));
65 vc->comment_lengths=_ogg_realloc(vc->comment_lengths,
66 (vc->comments+2)*sizeof(*vc->comment_lengths));
67 vc->comment_lengths[vc->comments]=strlen(comment);
68 vc->user_comments[vc->comments]=_ogg_malloc(vc->comment_lengths[vc->comments]+1);
69 strcpy(vc->user_comments[vc->comments], comment);
70 vc->comments++;
71 vc->user_comments[vc->comments]=NULL;
72 }
73
vorbis_comment_add_tag(vorbis_comment * vc,char * tag,char * contents)74 void vorbis_comment_add_tag(vorbis_comment *vc, char *tag, char *contents){
75 char *comment=alloca(strlen(tag)+strlen(contents)+2); /* +2 for = and \0 */
76 strcpy(comment, tag);
77 strcat(comment, "=");
78 strcat(comment, contents);
79 vorbis_comment_add(vc, comment);
80 }
81
82 /* This is more or less the same as strncasecmp - but that doesn't exist
83 * everywhere, and this is a fairly trivial function, so we include it */
tagcompare(const char * s1,const char * s2,int n)84 static int tagcompare(const char *s1, const char *s2, int n){
85 int c=0;
86 while(c < n){
87 if(toupper(s1[c]) != toupper(s2[c]))
88 return !0;
89 c++;
90 }
91 return 0;
92 }
93
vorbis_comment_query(vorbis_comment * vc,char * tag,int count)94 char *vorbis_comment_query(vorbis_comment *vc, char *tag, int count){
95 long i;
96 int found = 0;
97 int taglen = strlen(tag)+1; /* +1 for the = we append */
98 char *fulltag = alloca(taglen+ 1);
99
100 strcpy(fulltag, tag);
101 strcat(fulltag, "=");
102
103 for(i=0;i<vc->comments;i++){
104 if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
105 if(count == found)
106 /* We return a pointer to the data, not a copy */
107 return vc->user_comments[i] + taglen;
108 else
109 found++;
110 }
111 }
112 return NULL; /* didn't find anything */
113 }
114
vorbis_comment_query_count(vorbis_comment * vc,char * tag)115 int vorbis_comment_query_count(vorbis_comment *vc, char *tag){
116 int i,count=0;
117 int taglen = strlen(tag)+1; /* +1 for the = we append */
118 char *fulltag = alloca(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 return count;
128 }
129
vorbis_comment_clear(vorbis_comment * vc)130 void vorbis_comment_clear(vorbis_comment *vc){
131 if(vc){
132 long i;
133 for(i=0;i<vc->comments;i++)
134 if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
135 if(vc->user_comments)_ogg_free(vc->user_comments);
136 if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
137 if(vc->vendor)_ogg_free(vc->vendor);
138 }
139 memset(vc,0,sizeof(*vc));
140 }
141
142 /* blocksize 0 is guaranteed to be short, 1 is guarantted to be long.
143 They may be equal, but short will never ge greater than long */
vorbis_info_blocksize(vorbis_info * vi,int zo)144 int vorbis_info_blocksize(vorbis_info *vi,int zo){
145 codec_setup_info *ci = vi->codec_setup;
146 return ci ? ci->blocksizes[zo] : -1;
147 }
148
149 /* used by synthesis, which has a full, alloced vi */
vorbis_info_init(vorbis_info * vi)150 void vorbis_info_init(vorbis_info *vi){
151 memset(vi,0,sizeof(*vi));
152 vi->codec_setup=_ogg_calloc(1,sizeof(codec_setup_info));
153 }
154
vorbis_info_clear(vorbis_info * vi)155 void vorbis_info_clear(vorbis_info *vi){
156 codec_setup_info *ci=vi->codec_setup;
157 int i;
158
159 if(ci){
160
161 for(i=0;i<ci->modes;i++)
162 if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);
163
164 for(i=0;i<ci->maps;i++) /* unpack does the range checking */
165 _mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
166
167 for(i=0;i<ci->floors;i++) /* unpack does the range checking */
168 _floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
169
170 for(i=0;i<ci->residues;i++) /* unpack does the range checking */
171 _residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);
172
173 for(i=0;i<ci->books;i++){
174 if(ci->book_param[i]){
175 /* knows if the book was not alloced */
176 vorbis_staticbook_destroy(ci->book_param[i]);
177 }
178 if(ci->fullbooks)
179 vorbis_book_clear(ci->fullbooks+i);
180 }
181 if(ci->fullbooks)
182 _ogg_free(ci->fullbooks);
183
184 for(i=0;i<ci->psys;i++)
185 _vi_psy_free(ci->psy_param[i]);
186
187 _ogg_free(ci);
188 }
189
190 memset(vi,0,sizeof(*vi));
191 }
192
193 /* Header packing/unpacking ********************************************/
194
_vorbis_unpack_info(vorbis_info * vi,oggpack_buffer * opb)195 static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){
196 codec_setup_info *ci=vi->codec_setup;
197 if(!ci)return(OV_EFAULT);
198
199 vi->version=oggpack_read(opb,32);
200 if(vi->version!=0)return(OV_EVERSION);
201
202 vi->channels=oggpack_read(opb,8);
203 vi->rate=oggpack_read(opb,32);
204
205 vi->bitrate_upper=oggpack_read(opb,32);
206 vi->bitrate_nominal=oggpack_read(opb,32);
207 vi->bitrate_lower=oggpack_read(opb,32);
208
209 ci->blocksizes[0]=1<<oggpack_read(opb,4);
210 ci->blocksizes[1]=1<<oggpack_read(opb,4);
211
212 if(vi->rate<1)goto err_out;
213 if(vi->channels<1)goto err_out;
214 if(ci->blocksizes[0]<8)goto err_out;
215 if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
216
217 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
218
219 return(0);
220 err_out:
221 vorbis_info_clear(vi);
222 return(OV_EBADHEADER);
223 }
224
_vorbis_unpack_comment(vorbis_comment * vc,oggpack_buffer * opb)225 static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){
226 int i;
227 int vendorlen=oggpack_read(opb,32);
228 if(vendorlen<0)goto err_out;
229 vc->vendor=_ogg_calloc(vendorlen+1,1);
230 _v_readstring(opb,vc->vendor,vendorlen);
231 vc->comments=oggpack_read(opb,32);
232 if(vc->comments<0)goto err_out;
233 vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
234 vc->comment_lengths=_ogg_calloc(vc->comments+1, sizeof(*vc->comment_lengths));
235
236 for(i=0;i<vc->comments;i++){
237 int len=oggpack_read(opb,32);
238 if(len<0)goto err_out;
239 vc->comment_lengths[i]=len;
240 vc->user_comments[i]=_ogg_calloc(len+1,1);
241 _v_readstring(opb,vc->user_comments[i],len);
242 }
243 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
244
245 return(0);
246 err_out:
247 vorbis_comment_clear(vc);
248 return(OV_EBADHEADER);
249 }
250
251 /* all of the real encoding details are here. The modes, books,
252 everything */
_vorbis_unpack_books(vorbis_info * vi,oggpack_buffer * opb)253 static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
254 codec_setup_info *ci=vi->codec_setup;
255 int i;
256 if(!ci)return(OV_EFAULT);
257
258 /* codebooks */
259 ci->books=oggpack_read(opb,8)+1;
260 /*ci->book_param=_ogg_calloc(ci->books,sizeof(*ci->book_param));*/
261 for(i=0;i<ci->books;i++){
262 ci->book_param[i]=_ogg_calloc(1,sizeof(*ci->book_param[i]));
263 if(vorbis_staticbook_unpack(opb,ci->book_param[i]))goto err_out;
264 }
265
266 /* time backend settings; hooks are unused */
267 {
268 int times=oggpack_read(opb,6)+1;
269 for(i=0;i<times;i++){
270 int test=oggpack_read(opb,16);
271 if(test<0 || test>=VI_TIMEB)goto err_out;
272 }
273 }
274
275 /* floor backend settings */
276 ci->floors=oggpack_read(opb,6)+1;
277 /*ci->floor_type=_ogg_malloc(ci->floors*sizeof(*ci->floor_type));*/
278 /*ci->floor_param=_ogg_calloc(ci->floors,sizeof(void *));*/
279 for(i=0;i<ci->floors;i++){
280 ci->floor_type[i]=oggpack_read(opb,16);
281 if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
282 ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
283 if(!ci->floor_param[i])goto err_out;
284 }
285
286 /* residue backend settings */
287 ci->residues=oggpack_read(opb,6)+1;
288 /*ci->residue_type=_ogg_malloc(ci->residues*sizeof(*ci->residue_type));*/
289 /*ci->residue_param=_ogg_calloc(ci->residues,sizeof(void *));*/
290 for(i=0;i<ci->residues;i++){
291 ci->residue_type[i]=oggpack_read(opb,16);
292 if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out;
293 ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
294 if(!ci->residue_param[i])goto err_out;
295 }
296
297 /* map backend settings */
298 ci->maps=oggpack_read(opb,6)+1;
299 /*ci->map_type=_ogg_malloc(ci->maps*sizeof(*ci->map_type));*/
300 /*ci->map_param=_ogg_calloc(ci->maps,sizeof(void *));*/
301 for(i=0;i<ci->maps;i++){
302 ci->map_type[i]=oggpack_read(opb,16);
303 if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out;
304 ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
305 if(!ci->map_param[i])goto err_out;
306 }
307
308 /* mode settings */
309 ci->modes=oggpack_read(opb,6)+1;
310 /*vi->mode_param=_ogg_calloc(vi->modes,sizeof(void *));*/
311 for(i=0;i<ci->modes;i++){
312 ci->mode_param[i]=_ogg_calloc(1,sizeof(*ci->mode_param[i]));
313 ci->mode_param[i]->blockflag=oggpack_read(opb,1);
314 ci->mode_param[i]->windowtype=oggpack_read(opb,16);
315 ci->mode_param[i]->transformtype=oggpack_read(opb,16);
316 ci->mode_param[i]->mapping=oggpack_read(opb,8);
317
318 if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
319 if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
320 if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
321 }
322
323 if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */
324
325 return(0);
326 err_out:
327 vorbis_info_clear(vi);
328 return(OV_EBADHEADER);
329 }
330
331 /* The Vorbis header is in three packets; the initial small packet in
332 the first page that identifies basic parameters, a second packet
333 with bitstream comments and a third packet that holds the
334 codebook. */
335
vorbis_synthesis_headerin(vorbis_info * vi,vorbis_comment * vc,ogg_packet * op)336 int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
337 oggpack_buffer opb;
338
339 if(op){
340 oggpack_readinit(&opb,op->packet,op->bytes);
341
342 /* Which of the three types of header is this? */
343 /* Also verify header-ness, vorbis */
344 {
345 char buffer[6];
346 int packtype=oggpack_read(&opb,8);
347 memset(buffer,0,6);
348 _v_readstring(&opb,buffer,6);
349 if(memcmp(buffer,"vorbis",6)){
350 /* not a vorbis header */
351 return(OV_ENOTVORBIS);
352 }
353 switch(packtype){
354 case 0x01: /* least significant *bit* is read first */
355 if(!op->b_o_s){
356 /* Not the initial packet */
357 return(OV_EBADHEADER);
358 }
359 if(vi->rate!=0){
360 /* previously initialized info header */
361 return(OV_EBADHEADER);
362 }
363
364 return(_vorbis_unpack_info(vi,&opb));
365
366 case 0x03: /* least significant *bit* is read first */
367 if(vi->rate==0){
368 /* um... we didn't get the initial header */
369 return(OV_EBADHEADER);
370 }
371
372 return(_vorbis_unpack_comment(vc,&opb));
373
374 case 0x05: /* least significant *bit* is read first */
375 if(vi->rate==0 || vc->vendor==NULL){
376 /* um... we didn;t get the initial header or comments yet */
377 return(OV_EBADHEADER);
378 }
379
380 return(_vorbis_unpack_books(vi,&opb));
381
382 default:
383 /* Not a valid vorbis header type */
384 return(OV_EBADHEADER);
385 break;
386 }
387 }
388 }
389 return(OV_EBADHEADER);
390 }
391
392 /* pack side **********************************************************/
393
_vorbis_pack_info(oggpack_buffer * opb,vorbis_info * vi)394 static int _vorbis_pack_info(oggpack_buffer *opb,vorbis_info *vi){
395 codec_setup_info *ci=vi->codec_setup;
396 if(!ci)return(OV_EFAULT);
397
398 /* preamble */
399 oggpack_write(opb,0x01,8);
400 _v_writestring(opb,"vorbis", 6);
401
402 /* basic information about the stream */
403 oggpack_write(opb,0x00,32);
404 oggpack_write(opb,vi->channels,8);
405 oggpack_write(opb,vi->rate,32);
406
407 oggpack_write(opb,vi->bitrate_upper,32);
408 oggpack_write(opb,vi->bitrate_nominal,32);
409 oggpack_write(opb,vi->bitrate_lower,32);
410
411 oggpack_write(opb,ilog2(ci->blocksizes[0]),4);
412 oggpack_write(opb,ilog2(ci->blocksizes[1]),4);
413 oggpack_write(opb,1,1);
414
415 return(0);
416 }
417
_vorbis_pack_comment(oggpack_buffer * opb,vorbis_comment * vc)418 static int _vorbis_pack_comment(oggpack_buffer *opb,vorbis_comment *vc){
419 char temp[]="Xiph.Org libVorbis I 20050304";
420 int bytes = strlen(temp);
421
422 /* preamble */
423 oggpack_write(opb,0x03,8);
424 _v_writestring(opb,"vorbis", 6);
425
426 /* vendor */
427 oggpack_write(opb,bytes,32);
428 _v_writestring(opb,temp, bytes);
429
430 /* comments */
431
432 oggpack_write(opb,vc->comments,32);
433 if(vc->comments){
434 int i;
435 for(i=0;i<vc->comments;i++){
436 if(vc->user_comments[i]){
437 oggpack_write(opb,vc->comment_lengths[i],32);
438 _v_writestring(opb,vc->user_comments[i], vc->comment_lengths[i]);
439 }else{
440 oggpack_write(opb,0,32);
441 }
442 }
443 }
444 oggpack_write(opb,1,1);
445
446 return(0);
447 }
448
_vorbis_pack_books(oggpack_buffer * opb,vorbis_info * vi)449 static int _vorbis_pack_books(oggpack_buffer *opb,vorbis_info *vi){
450 codec_setup_info *ci=vi->codec_setup;
451 int i;
452 if(!ci)return(OV_EFAULT);
453
454 oggpack_write(opb,0x05,8);
455 _v_writestring(opb,"vorbis", 6);
456
457 /* books */
458 oggpack_write(opb,ci->books-1,8);
459 for(i=0;i<ci->books;i++)
460 if(vorbis_staticbook_pack(ci->book_param[i],opb))goto err_out;
461
462 /* times; hook placeholders */
463 oggpack_write(opb,0,6);
464 oggpack_write(opb,0,16);
465
466 /* floors */
467 oggpack_write(opb,ci->floors-1,6);
468 for(i=0;i<ci->floors;i++){
469 oggpack_write(opb,ci->floor_type[i],16);
470 if(_floor_P[ci->floor_type[i]]->pack)
471 _floor_P[ci->floor_type[i]]->pack(ci->floor_param[i],opb);
472 else
473 goto err_out;
474 }
475
476 /* residues */
477 oggpack_write(opb,ci->residues-1,6);
478 for(i=0;i<ci->residues;i++){
479 oggpack_write(opb,ci->residue_type[i],16);
480 _residue_P[ci->residue_type[i]]->pack(ci->residue_param[i],opb);
481 }
482
483 /* maps */
484 oggpack_write(opb,ci->maps-1,6);
485 for(i=0;i<ci->maps;i++){
486 oggpack_write(opb,ci->map_type[i],16);
487 _mapping_P[ci->map_type[i]]->pack(vi,ci->map_param[i],opb);
488 }
489
490 /* modes */
491 oggpack_write(opb,ci->modes-1,6);
492 for(i=0;i<ci->modes;i++){
493 oggpack_write(opb,ci->mode_param[i]->blockflag,1);
494 oggpack_write(opb,ci->mode_param[i]->windowtype,16);
495 oggpack_write(opb,ci->mode_param[i]->transformtype,16);
496 oggpack_write(opb,ci->mode_param[i]->mapping,8);
497 }
498 oggpack_write(opb,1,1);
499
500 return(0);
501 err_out:
502 return(-1);
503 }
504
vorbis_commentheader_out(vorbis_comment * vc,ogg_packet * op)505 int vorbis_commentheader_out(vorbis_comment *vc,
506 ogg_packet *op){
507
508 oggpack_buffer opb;
509
510 oggpack_writeinit(&opb);
511 if(_vorbis_pack_comment(&opb,vc)) return OV_EIMPL;
512
513 op->packet = _ogg_malloc(oggpack_bytes(&opb));
514 memcpy(op->packet, opb.buffer, oggpack_bytes(&opb));
515
516 op->bytes=oggpack_bytes(&opb);
517 op->b_o_s=0;
518 op->e_o_s=0;
519 op->granulepos=0;
520 op->packetno=1;
521
522 return 0;
523 }
524
vorbis_analysis_headerout(vorbis_dsp_state * v,vorbis_comment * vc,ogg_packet * op,ogg_packet * op_comm,ogg_packet * op_code)525 int vorbis_analysis_headerout(vorbis_dsp_state *v,
526 vorbis_comment *vc,
527 ogg_packet *op,
528 ogg_packet *op_comm,
529 ogg_packet *op_code){
530 int ret=OV_EIMPL;
531 vorbis_info *vi=v->vi;
532 oggpack_buffer opb;
533 private_state *b=v->backend_state;
534
535 if(!b){
536 ret=OV_EFAULT;
537 goto err_out;
538 }
539
540 /* first header packet **********************************************/
541
542 oggpack_writeinit(&opb);
543 if(_vorbis_pack_info(&opb,vi))goto err_out;
544
545 /* build the packet */
546 if(b->header)_ogg_free(b->header);
547 b->header=_ogg_malloc(oggpack_bytes(&opb));
548 memcpy(b->header,opb.buffer,oggpack_bytes(&opb));
549 op->packet=b->header;
550 op->bytes=oggpack_bytes(&opb);
551 op->b_o_s=1;
552 op->e_o_s=0;
553 op->granulepos=0;
554 op->packetno=0;
555
556 /* second header packet (comments) **********************************/
557
558 oggpack_reset(&opb);
559 if(_vorbis_pack_comment(&opb,vc))goto err_out;
560
561 if(b->header1)_ogg_free(b->header1);
562 b->header1=_ogg_malloc(oggpack_bytes(&opb));
563 memcpy(b->header1,opb.buffer,oggpack_bytes(&opb));
564 op_comm->packet=b->header1;
565 op_comm->bytes=oggpack_bytes(&opb);
566 op_comm->b_o_s=0;
567 op_comm->e_o_s=0;
568 op_comm->granulepos=0;
569 op_comm->packetno=1;
570
571 /* third header packet (modes/codebooks) ****************************/
572
573 oggpack_reset(&opb);
574 if(_vorbis_pack_books(&opb,vi))goto err_out;
575
576 if(b->header2)_ogg_free(b->header2);
577 b->header2=_ogg_malloc(oggpack_bytes(&opb));
578 memcpy(b->header2,opb.buffer,oggpack_bytes(&opb));
579 op_code->packet=b->header2;
580 op_code->bytes=oggpack_bytes(&opb);
581 op_code->b_o_s=0;
582 op_code->e_o_s=0;
583 op_code->granulepos=0;
584 op_code->packetno=2;
585
586 oggpack_writeclear(&opb);
587 return(0);
588 err_out:
589 oggpack_writeclear(&opb);
590 memset(op,0,sizeof(*op));
591 memset(op_comm,0,sizeof(*op_comm));
592 memset(op_code,0,sizeof(*op_code));
593
594 if(b->header)_ogg_free(b->header);
595 if(b->header1)_ogg_free(b->header1);
596 if(b->header2)_ogg_free(b->header2);
597 b->header=NULL;
598 b->header1=NULL;
599 b->header2=NULL;
600 return(ret);
601 }
602
vorbis_granule_time(vorbis_dsp_state * v,ogg_int64_t granulepos)603 double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){
604 if(granulepos>=0)
605 return((double)granulepos/v->vi->rate);
606 return(-1);
607 }
608