vorbis_info.c (19866B)
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 */ 36 static void _v_writestring(oggpack_buffer *o,const char *s, int bytes){ 37 38 while(bytes--){ 39 oggpack_write(o,*s++,8); 40 } 41 } 42 43 static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){ 44 while(bytes--){ 45 *buf++=oggpack_read(o,8); 46 } 47 } 48 49 static int _v_toupper(int c) { 50 return (c >= 'a' && c <= 'z') ? (c & ~('a' - 'A')) : c; 51 } 52 53 void vorbis_comment_init(vorbis_comment *vc){ 54 memset(vc,0,sizeof(*vc)); 55 } 56 57 void 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 69 void 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 */ 81 static 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 91 char *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 } 114 115 int 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 } 130 131 void 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 */ 147 int 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 */ 153 void vorbis_info_init(vorbis_info *vi){ 154 memset(vi,0,sizeof(*vi)); 155 vi->codec_setup=_ogg_calloc(1,sizeof(codec_setup_info)); 156 } 157 158 void 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 ********************************************/ 206 207 static 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 } 242 243 static 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 */ 275 static 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? */ 352 int 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. */ 380 381 int 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 **********************************************************/ 450 451 static 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 } 478 479 static 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 } 508 509 static 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); 561 err_out: 562 return(-1); 563 } 564 565 int 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 } 588 589 int 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 } 669 670 double 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 } 684 685 const char *vorbis_version_string(void){ 686 return GENERAL_VENDOR_STRING; 687 }