release/src/router/libvorbis/lib/info.c

   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 1994-2009             *
   9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
  10  *                                                                  *
  11  ********************************************************************
  12
  13  function: maintain the info structure, info <-> header packets
  14  last mod: $Id: info.c 16243 2009-07-10 02:49:31Z xiphmont $
  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 #define GENERAL_VENDOR_STRING "Xiph.Org libVorbis 1.2.3"
  35 #define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20090709"
  36
  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 }
  47
  48 static void _v_writestring(oggpack_buffer *o,const char *s, int bytes){
  49
  50   while(bytes--){
  51     oggpack_write(o,*s++,8);
  52   }
  53 }
  54
  55 static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
  56   while(bytes--){
  57     *buf++=oggpack_read(o,8);
  58   }
  59 }
  60
  61 void vorbis_comment_init(vorbis_comment *vc){
  62   memset(vc,0,sizeof(*vc));
  63 }
  64
  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 }
  76
  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 }
  84
  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 }
  96
  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]=_ogg_calloc(1,sizeof(*ci->book_param[i]));
 282     if(vorbis_staticbook_unpack(opb,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)) return OV_EIMPL;
 554
 555   op->packet = _ogg_malloc(oggpack_bytes(&opb));
 556   memcpy(op->packet, opb.buffer, oggpack_bytes(&opb));
 557
 558   op->bytes=oggpack_bytes(&opb);
 559   op->b_o_s=0;
 560   op->e_o_s=0;
 561   op->granulepos=0;
 562   op->packetno=1;
 563
 564   return 0;
 565 }
 566
 567 int vorbis_analysis_headerout(vorbis_dsp_state *v,
 568                               vorbis_comment *vc,
 569                               ogg_packet *op,
 570                               ogg_packet *op_comm,
 571                               ogg_packet *op_code){
 572   int ret=OV_EIMPL;
 573   vorbis_info *vi=v->vi;
 574   oggpack_buffer opb;
 575   private_state *b=v->backend_state;
 576
 577   if(!b){
 578     ret=OV_EFAULT;
 579     goto err_out;
 580   }
 581
 582   /* first header packet **********************************************/
 583
 584   oggpack_writeinit(&opb);
 585   if(_vorbis_pack_info(&opb,vi))goto err_out;
 586
 587   /* build the packet */
 588   if(b->header)_ogg_free(b->header);
 589   b->header=_ogg_malloc(oggpack_bytes(&opb));
 590   memcpy(b->header,opb.buffer,oggpack_bytes(&opb));
 591   op->packet=b->header;
 592   op->bytes=oggpack_bytes(&opb);
 593   op->b_o_s=1;
 594   op->e_o_s=0;
 595   op->granulepos=0;
 596   op->packetno=0;
 597
 598   /* second header packet (comments) **********************************/
 599
 600   oggpack_reset(&opb);
 601   if(_vorbis_pack_comment(&opb,vc))goto err_out;
 602
 603   if(b->header1)_ogg_free(b->header1);
 604   b->header1=_ogg_malloc(oggpack_bytes(&opb));
 605   memcpy(b->header1,opb.buffer,oggpack_bytes(&opb));
 606   op_comm->packet=b->header1;
 607   op_comm->bytes=oggpack_bytes(&opb);
 608   op_comm->b_o_s=0;
 609   op_comm->e_o_s=0;
 610   op_comm->granulepos=0;
 611   op_comm->packetno=1;
 612
 613   /* third header packet (modes/codebooks) ****************************/
 614
 615   oggpack_reset(&opb);
 616   if(_vorbis_pack_books(&opb,vi))goto err_out;
 617
 618   if(b->header2)_ogg_free(b->header2);
 619   b->header2=_ogg_malloc(oggpack_bytes(&opb));
 620   memcpy(b->header2,opb.buffer,oggpack_bytes(&opb));
 621   op_code->packet=b->header2;
 622   op_code->bytes=oggpack_bytes(&opb);
 623   op_code->b_o_s=0;
 624   op_code->e_o_s=0;
 625   op_code->granulepos=0;
 626   op_code->packetno=2;
 627
 628   oggpack_writeclear(&opb);
 629   return(0);
 630  err_out:
 631   oggpack_writeclear(&opb);
 632   memset(op,0,sizeof(*op));
 633   memset(op_comm,0,sizeof(*op_comm));
 634   memset(op_code,0,sizeof(*op_code));
 635
 636   if(b){
 637     if(b->header)_ogg_free(b->header);
 638     if(b->header1)_ogg_free(b->header1);
 639     if(b->header2)_ogg_free(b->header2);
 640     b->header=NULL;
 641     b->header1=NULL;
 642     b->header2=NULL;
 643   }
 644   return(ret);
 645 }
 646
 647 double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){
 648   if(granulepos>=0)
 649     return((double)granulepos/v->vi->rate);
 650   return(-1);
 651 }
 652
 653 const char *vorbis_version_string(void){
 654   return GENERAL_VENDOR_STRING;
 655 }