vrshoot: b2f14e535253 libs/vorbis/info.c

vrshoot

view libs/vorbis/info.c @ 0:b2f14e535253

initial commit

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 01 Feb 2014 19:58:19 +0200
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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 * *

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 18186 2012-02-03 22:08:44Z 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 1.3.3"

35 #define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20120203 (Omnipresent)"

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);

102

103 strcpy(fulltag, tag);

104 strcat(fulltag, "=");

105

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 }

117

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, "=");

124

125 for(i=0;i<vc->comments;i++){

126 if(!tagcompare(vc->user_comments[i], fulltag, taglen))

127 count++;

128 }

129

130 return count;

131 }

132

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 }

146

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 }

153

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 }

159

160 void vorbis_info_clear(vorbis_info *vi){

161 codec_setup_info *ci=vi->codec_setup;

162 int i;

163

164 if(ci){

165

166 for(i=0;i<ci->modes;i++)

167 if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);

168

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]);

174

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]);

180

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]);

186

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);

197

198 for(i=0;i<ci->psys;i++)

199 _vi_psy_free(ci->psy_param[i]);

200

201 _ogg_free(ci);

202 }

203

204 memset(vi,0,sizeof(*vi));

205 }

206

207 /* Header packing/unpacking ********************************************/

208

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);

212

213 vi->version=oggpack_read(opb,32);

214 if(vi->version!=0)return(OV_EVERSION);

215

216 vi->channels=oggpack_read(opb,8);

217 vi->rate=oggpack_read(opb,32);

218

219 vi->bitrate_upper=oggpack_read(opb,32);

220 vi->bitrate_nominal=oggpack_read(opb,32);

221 vi->bitrate_lower=oggpack_read(opb,32);

222

223 ci->blocksizes[0]=1<<oggpack_read(opb,4);

224 ci->blocksizes[1]=1<<oggpack_read(opb,4);

225

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;

231

232 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */

233

234 return(0);

235 err_out:

236 vorbis_info_clear(vi);

237 return(OV_EBADHEADER);

238 }

239

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));

253

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 */

263

264 return(0);

265 err_out:

266 vorbis_comment_clear(vc);

267 return(OV_EBADHEADER);

268 }

269

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);

276

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 }

284

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 }

294

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 }

304

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 }

314

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 }

324

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);

334

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 }

340

341 if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */

342

343 return(0);

344 err_out:

345 vorbis_info_clear(vi);

346 return(OV_EBADHEADER);

347 }

348

349 /* Is this packet a vorbis ID header? */

350 int vorbis_synthesis_idheader(ogg_packet *op){

351 oggpack_buffer opb;

352 char buffer[6];

353

354 if(op){

355 oggpack_readinit(&opb,op->packet,op->bytes);

356

357 if(!op->b_o_s)

358 return(0); /* Not the initial packet */

359

360 if(oggpack_read(&opb,8) != 1)

361 return 0; /* not an ID header */

362

363 memset(buffer,0,6);

364 _v_readstring(&opb,buffer,6);

365 if(memcmp(buffer,"vorbis",6))

366 return 0; /* not vorbis */

367

368 return 1;

369 }

370

371 return 0;

372 }

373

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. */

378

379 int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){

380 oggpack_buffer opb;

381

382 if(op){

383 oggpack_readinit(&opb,op->packet,op->bytes);

384

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 }

406

407 return(_vorbis_unpack_info(vi,&opb));

408

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 }

414

415 return(_vorbis_unpack_comment(vc,&opb));

416

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 }

422

423 return(_vorbis_unpack_books(vi,&opb));

424

425 default:

426 /* Not a valid vorbis header type */

427 return(OV_EBADHEADER);

428 break;

429 }

430 }

431 }

432 return(OV_EBADHEADER);

433 }

434

435 /* pack side **********************************************************/

436

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);

440

441 /* preamble */

442 oggpack_write(opb,0x01,8);

443 _v_writestring(opb,"vorbis", 6);

444

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);

449

450 oggpack_write(opb,vi->bitrate_upper,32);

451 oggpack_write(opb,vi->bitrate_nominal,32);

452 oggpack_write(opb,vi->bitrate_lower,32);

453

454 oggpack_write(opb,ilog2(ci->blocksizes[0]),4);

455 oggpack_write(opb,ilog2(ci->blocksizes[1]),4);

456 oggpack_write(opb,1,1);

457

458 return(0);

459 }

460

461 static int _vorbis_pack_comment(oggpack_buffer *opb,vorbis_comment *vc){

462 int bytes = strlen(ENCODE_VENDOR_STRING);

463

464 /* preamble */

465 oggpack_write(opb,0x03,8);

466 _v_writestring(opb,"vorbis", 6);

467

468 /* vendor */

469 oggpack_write(opb,bytes,32);

470 _v_writestring(opb,ENCODE_VENDOR_STRING, bytes);

471

472 /* comments */

473

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);

487

488 return(0);

489 }

490

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);

495

496 oggpack_write(opb,0x05,8);

497 _v_writestring(opb,"vorbis", 6);

498

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;

503

504 /* times; hook placeholders */

505 oggpack_write(opb,0,6);

506 oggpack_write(opb,0,16);

507

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 }

517

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 }

524

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 }

531

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);

541

542 return(0);

543 err_out:

544 return(-1);

545 }

546

547 int vorbis_commentheader_out(vorbis_comment *vc,

548 ogg_packet *op){

549

550 oggpack_buffer opb;

551

552 oggpack_writeinit(&opb);

553 if(_vorbis_pack_comment(&opb,vc)){

554 oggpack_writeclear(&opb);

555 return OV_EIMPL;

556 }

557

558 op->packet = _ogg_malloc(oggpack_bytes(&opb));

559 memcpy(op->packet, opb.buffer, oggpack_bytes(&opb));

560

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;

566

567 oggpack_writeclear(&opb);

568 return 0;

569 }

570

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;

580

581 if(!b){

582 ret=OV_EFAULT;

583 goto err_out;

584 }

585

586 /* first header packet **********************************************/

587

588 oggpack_writeinit(&opb);

589 if(_vorbis_pack_info(&opb,vi))goto err_out;

590

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;

601

602 /* second header packet (comments) **********************************/

603

604 oggpack_reset(&opb);

605 if(_vorbis_pack_comment(&opb,vc))goto err_out;

606

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;

616

617 /* third header packet (modes/codebooks) ****************************/

618

619 oggpack_reset(&opb);

620 if(_vorbis_pack_books(&opb,vi))goto err_out;

621

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;

631

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));

638

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 }

650

651 double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){

652 if(granulepos == -1) return -1;

653

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 }

665

666 const char *vorbis_version_string(void){

667 return GENERAL_VENDOR_STRING;

668 }