/src/vorbis/lib/info.c

Source (jump to first uncovered line)
/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015             *
 * by the Xiph.Org Foundation https://xiph.org/                     *
 *                                                                  *
 ********************************************************************

 function: maintain the info structure, info <-> header packets

 ********************************************************************/

/* general handling of the header and the vorbis_info structure (and
   substructures) */

#include <stdlib.h>
#include <string.h>
#include <ogg/ogg.h>
#include "vorbis/codec.h"
#include "codec_internal.h"
#include "codebook.h"
#include "registry.h"
#include "window.h"
#include "psy.h"
#include "misc.h"
#include "os.h"

#define GENERAL_VENDOR_STRING "Xiph.Org libVorbis 1.3.7"
#define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20200704 (Reducing Environment)"

/* helpers */
static void _v_writestring(oggpack_buffer *o,const char *s, int bytes){

  while(bytes--){
    oggpack_write(o,*s++,8);
  }
}

static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
  while(bytes--){
    *buf++=oggpack_read(o,8);
  }
}

static int _v_toupper(int c) {
  return (c >= 'a' && c <= 'z') ? (c & ~('a' - 'A')) : c;
}

void vorbis_comment_init(vorbis_comment *vc){
  memset(vc,0,sizeof(*vc));
}

void vorbis_comment_add(vorbis_comment *vc,const char *comment){
  vc->user_comments=_ogg_realloc(vc->user_comments,
                            (vc->comments+2)*sizeof(*vc->user_comments));
  vc->comment_lengths=_ogg_realloc(vc->comment_lengths,
                                  (vc->comments+2)*sizeof(*vc->comment_lengths));
  vc->comment_lengths[vc->comments]=strlen(comment);
  vc->user_comments[vc->comments]=_ogg_malloc(vc->comment_lengths[vc->comments]+1);
  strcpy(vc->user_comments[vc->comments], comment);
  vc->comments++;
  vc->user_comments[vc->comments]=NULL;
}

void vorbis_comment_add_tag(vorbis_comment *vc, const char *tag, const char *contents){
  /* Length for key and value +2 for = and \0 */
  char *comment=_ogg_malloc(strlen(tag)+strlen(contents)+2);
  strcpy(comment, tag);
  strcat(comment, "=");
  strcat(comment, contents);
  vorbis_comment_add(vc, comment);
  _ogg_free(comment);
}

/* This is more or less the same as strncasecmp - but that doesn't exist
 * everywhere, and this is a fairly trivial function, so we include it */
static int tagcompare(const char *s1, const char *s2, int n){
  int c=0;
  while(c < n){
    if(_v_toupper(s1[c]) != _v_toupper(s2[c]))
      return !0;
    c++;
  }
  return 0;
}

char *vorbis_comment_query(vorbis_comment *vc, const char *tag, int count){
  long i;
  int found = 0;
  int taglen = strlen(tag)+1; /* +1 for the = we append */
  char *fulltag = _ogg_malloc(taglen+1);

  strcpy(fulltag, tag);
  strcat(fulltag, "=");

  for(i=0;i<vc->comments;i++){
    if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
      if(count == found) {
        /* We return a pointer to the data, not a copy */
        _ogg_free(fulltag);
        return vc->user_comments[i] + taglen;
      } else {
        found++;
      }
    }
  }
  _ogg_free(fulltag);
  return NULL; /* didn't find anything */
}

int vorbis_comment_query_count(vorbis_comment *vc, const char *tag){
  int i,count=0;
  int taglen = strlen(tag)+1; /* +1 for the = we append */
  char *fulltag = _ogg_malloc(taglen+1);
  strcpy(fulltag,tag);
  strcat(fulltag, "=");

  for(i=0;i<vc->comments;i++){
    if(!tagcompare(vc->user_comments[i], fulltag, taglen))
      count++;
  }

  _ogg_free(fulltag);
  return count;
}

void vorbis_comment_clear(vorbis_comment *vc){
  if(vc){
    long i;
    if(vc->user_comments){
      for(i=0;i<vc->comments;i++)
        if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
      _ogg_free(vc->user_comments);
    }
    if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
    if(vc->vendor)_ogg_free(vc->vendor);
    memset(vc,0,sizeof(*vc));
  }
}

/* blocksize 0 is guaranteed to be short, 1 is guaranteed to be long.
   They may be equal, but short will never ge greater than long */
int vorbis_info_blocksize(vorbis_info *vi,int zo){
  codec_setup_info *ci = vi->codec_setup;
  return ci ? ci->blocksizes[zo] : -1;
}

/* used by synthesis, which has a full, alloced vi */
void vorbis_info_init(vorbis_info *vi){
  memset(vi,0,sizeof(*vi));
  vi->codec_setup=_ogg_calloc(1,sizeof(codec_setup_info));
}

void vorbis_info_clear(vorbis_info *vi){
  codec_setup_info     *ci=vi->codec_setup;
  int i;

  if(ci){

    for(i=0;i<ci->modes;i++)
      if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);

    for(i=0;i<ci->maps;i++) /* unpack does the range checking */
      if(ci->map_param[i]) /* this may be cleaning up an aborted
                              unpack, in which case the below type
                              cannot be trusted */
        _mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);

    for(i=0;i<ci->floors;i++) /* unpack does the range checking */
      if(ci->floor_param[i]) /* this may be cleaning up an aborted
                                unpack, in which case the below type
                                cannot be trusted */
        _floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);

    for(i=0;i<ci->residues;i++) /* unpack does the range checking */
      if(ci->residue_param[i]) /* this may be cleaning up an aborted
                                  unpack, in which case the below type
                                  cannot be trusted */
        _residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);

    for(i=0;i<ci->books;i++){
      if(ci->book_param[i]){
        /* knows if the book was not alloced */
        vorbis_staticbook_destroy(ci->book_param[i]);
      }
      if(ci->fullbooks)
        vorbis_book_clear(ci->fullbooks+i);
    }
    if(ci->fullbooks)
        _ogg_free(ci->fullbooks);

    for(i=0;i<ci->psys;i++)
      _vi_psy_free(ci->psy_param[i]);

    _ogg_free(ci);
  }

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

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

static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){
  codec_setup_info     *ci=vi->codec_setup;
  int bs;
  if(!ci)return(OV_EFAULT);

  vi->version=oggpack_read(opb,32);
  if(vi->version!=0)return(OV_EVERSION);

  vi->channels=oggpack_read(opb,8);
  vi->rate=oggpack_read(opb,32);

  vi->bitrate_upper=(ogg_int32_t)oggpack_read(opb,32);
  vi->bitrate_nominal=(ogg_int32_t)oggpack_read(opb,32);
  vi->bitrate_lower=(ogg_int32_t)oggpack_read(opb,32);

  bs = oggpack_read(opb,4);
  if(bs<0)goto err_out;
  ci->blocksizes[0]=1<<bs;
  bs = oggpack_read(opb,4);
  if(bs<0)goto err_out;
  ci->blocksizes[1]=1<<bs;

  if(vi->rate<1)goto err_out;
  if(vi->channels<1)goto err_out;
  if(ci->blocksizes[0]<64)goto err_out;
  if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
  if(ci->blocksizes[1]>8192)goto err_out;

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

  return(0);
 err_out:
  vorbis_info_clear(vi);
  return(OV_EBADHEADER);
}

static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){
  int i;
  int vendorlen=oggpack_read(opb,32);
  if(vendorlen<0)goto err_out;
  if(vendorlen>opb->storage-8)goto err_out;
  vc->vendor=_ogg_calloc(vendorlen+1,1);
  _v_readstring(opb,vc->vendor,vendorlen);
  i=oggpack_read(opb,32);
  if(i<0)goto err_out;
  if(i>((opb->storage-oggpack_bytes(opb))>>2))goto err_out;
  vc->comments=i;
  vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
  vc->comment_lengths=_ogg_calloc(vc->comments+1, sizeof(*vc->comment_lengths));

  for(i=0;i<vc->comments;i++){
    int len=oggpack_read(opb,32);
    if(len<0)goto err_out;
    if(len>opb->storage-oggpack_bytes(opb))goto err_out;
    vc->comment_lengths[i]=len;
    vc->user_comments[i]=_ogg_calloc(len+1,1);
    _v_readstring(opb,vc->user_comments[i],len);
  }
  if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */

  return(0);
 err_out:
  vorbis_comment_clear(vc);
  return(OV_EBADHEADER);
}

/* all of the real encoding details are here.  The modes, books,
   everything */
static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
  codec_setup_info     *ci=vi->codec_setup;
  int i;

  /* codebooks */
  ci->books=oggpack_read(opb,8)+1;
  if(ci->books<=0)goto err_out;
  for(i=0;i<ci->books;i++){
    ci->book_param[i]=vorbis_staticbook_unpack(opb);
    if(!ci->book_param[i])goto err_out;
  }

  /* time backend settings; hooks are unused */
  {
    int times=oggpack_read(opb,6)+1;
    if(times<=0)goto err_out;
    for(i=0;i<times;i++){
      int test=oggpack_read(opb,16);
      if(test<0 || test>=VI_TIMEB)goto err_out;
    }
  }

  /* floor backend settings */
  ci->floors=oggpack_read(opb,6)+1;
  if(ci->floors<=0)goto err_out;
  for(i=0;i<ci->floors;i++){
    ci->floor_type[i]=oggpack_read(opb,16);
    if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
    ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
    if(!ci->floor_param[i])goto err_out;
  }

  /* residue backend settings */
  ci->residues=oggpack_read(opb,6)+1;
  if(ci->residues<=0)goto err_out;
  for(i=0;i<ci->residues;i++){
    ci->residue_type[i]=oggpack_read(opb,16);
    if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out;
    ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
    if(!ci->residue_param[i])goto err_out;
  }

  /* map backend settings */
  ci->maps=oggpack_read(opb,6)+1;
  if(ci->maps<=0)goto err_out;
  for(i=0;i<ci->maps;i++){
    ci->map_type[i]=oggpack_read(opb,16);
    if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out;
    ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
    if(!ci->map_param[i])goto err_out;
  }

  /* mode settings */
  ci->modes=oggpack_read(opb,6)+1;
  if(ci->modes<=0)goto err_out;
  for(i=0;i<ci->modes;i++){
    ci->mode_param[i]=_ogg_calloc(1,sizeof(*ci->mode_param[i]));
    ci->mode_param[i]->blockflag=oggpack_read(opb,1);
    ci->mode_param[i]->windowtype=oggpack_read(opb,16);
    ci->mode_param[i]->transformtype=oggpack_read(opb,16);
    ci->mode_param[i]->mapping=oggpack_read(opb,8);

    if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
    if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
    if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
    if(ci->mode_param[i]->mapping<0)goto err_out;
  }

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

  return(0);
 err_out:
  vorbis_info_clear(vi);
  return(OV_EBADHEADER);
}

/* Is this packet a vorbis ID header? */
int vorbis_synthesis_idheader(ogg_packet *op){
  oggpack_buffer opb;
  char buffer[6];

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

    if(!op->b_o_s)
      return(0); /* Not the initial packet */

    if(oggpack_read(&opb,8) != 1)
      return 0; /* not an ID header */

    memset(buffer,0,6);
    _v_readstring(&opb,buffer,6);
    if(memcmp(buffer,"vorbis",6))
      return 0; /* not vorbis */

    return 1;
  }

  return 0;
}

/* The Vorbis header is in three packets; the initial small packet in
   the first page that identifies basic parameters, a second packet
   with bitstream comments and a third packet that holds the
   codebook. */

int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
  oggpack_buffer opb;

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

    /* Which of the three types of header is this? */
    /* Also verify header-ness, vorbis */
    {
      char buffer[6];
      int packtype=oggpack_read(&opb,8);
      memset(buffer,0,6);
      _v_readstring(&opb,buffer,6);
      if(memcmp(buffer,"vorbis",6)){
        /* not a vorbis header */
        return(OV_ENOTVORBIS);
      }
      switch(packtype){
      case 0x01: /* least significant *bit* is read first */
        if(!op->b_o_s){
          /* Not the initial packet */
          return(OV_EBADHEADER);
        }
        if(vi->rate!=0){
          /* previously initialized info header */
          return(OV_EBADHEADER);
        }

        return(_vorbis_unpack_info(vi,&opb));

      case 0x03: /* least significant *bit* is read first */
        if(vi->rate==0){
          /* um... we didn't get the initial header */
          return(OV_EBADHEADER);
        }
        if(vc->vendor!=NULL){
          /* previously initialized comment header */
          return(OV_EBADHEADER);
        }

        return(_vorbis_unpack_comment(vc,&opb));

      case 0x05: /* least significant *bit* is read first */
        if(vi->rate==0 || vc->vendor==NULL){
          /* um... we didn;t get the initial header or comments yet */
          return(OV_EBADHEADER);
        }
        if(vi->codec_setup==NULL){
          /* improperly initialized vorbis_info */
          return(OV_EFAULT);
        }
        if(((codec_setup_info *)vi->codec_setup)->books>0){
          /* previously initialized setup header */
          return(OV_EBADHEADER);
        }

        return(_vorbis_unpack_books(vi,&opb));

      default:
        /* Not a valid vorbis header type */
        return(OV_EBADHEADER);
        break;
      }
    }
  }
  return(OV_EBADHEADER);
}

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

static int _vorbis_pack_info(oggpack_buffer *opb,vorbis_info *vi){
  codec_setup_info     *ci=vi->codec_setup;
  if(!ci||
     ci->blocksizes[0]<64||
     ci->blocksizes[1]<ci->blocksizes[0]){
    return(OV_EFAULT);
  }

  /* preamble */
  oggpack_write(opb,0x01,8);
  _v_writestring(opb,"vorbis", 6);

  /* basic information about the stream */
  oggpack_write(opb,0x00,32);
  oggpack_write(opb,vi->channels,8);
  oggpack_write(opb,vi->rate,32);

  oggpack_write(opb,vi->bitrate_upper,32);
  oggpack_write(opb,vi->bitrate_nominal,32);
  oggpack_write(opb,vi->bitrate_lower,32);

  oggpack_write(opb,ov_ilog(ci->blocksizes[0]-1),4);
  oggpack_write(opb,ov_ilog(ci->blocksizes[1]-1),4);
  oggpack_write(opb,1,1);

  return(0);
}

static int _vorbis_pack_comment(oggpack_buffer *opb,vorbis_comment *vc){
  int bytes = strlen(ENCODE_VENDOR_STRING);

  /* preamble */
  oggpack_write(opb,0x03,8);
  _v_writestring(opb,"vorbis", 6);

  /* vendor */
  oggpack_write(opb,bytes,32);
  _v_writestring(opb,ENCODE_VENDOR_STRING, bytes);

  /* comments */

  oggpack_write(opb,vc->comments,32);
  if(vc->comments){
    int i;
    for(i=0;i<vc->comments;i++){
      if(vc->user_comments[i]){
        oggpack_write(opb,vc->comment_lengths[i],32);
        _v_writestring(opb,vc->user_comments[i], vc->comment_lengths[i]);
      }else{
        oggpack_write(opb,0,32);
      }
    }
  }
  oggpack_write(opb,1,1);

  return(0);
}

static int _vorbis_pack_books(oggpack_buffer *opb,vorbis_info *vi){
  codec_setup_info     *ci=vi->codec_setup;
  int i;
  if(!ci)return(OV_EFAULT);

  oggpack_write(opb,0x05,8);
  _v_writestring(opb,"vorbis", 6);

  /* books */
  oggpack_write(opb,ci->books-1,8);
  for(i=0;i<ci->books;i++)
    if(vorbis_staticbook_pack(ci->book_param[i],opb))goto err_out;

  /* times; hook placeholders */
  oggpack_write(opb,0,6);
  oggpack_write(opb,0,16);

  /* floors */
  oggpack_write(opb,ci->floors-1,6);
  for(i=0;i<ci->floors;i++){
    oggpack_write(opb,ci->floor_type[i],16);
    if(_floor_P[ci->floor_type[i]]->pack)
      _floor_P[ci->floor_type[i]]->pack(ci->floor_param[i],opb);
    else
      goto err_out;
  }

  /* residues */
  oggpack_write(opb,ci->residues-1,6);
  for(i=0;i<ci->residues;i++){
    oggpack_write(opb,ci->residue_type[i],16);
    _residue_P[ci->residue_type[i]]->pack(ci->residue_param[i],opb);
  }

  /* maps */
  oggpack_write(opb,ci->maps-1,6);
  for(i=0;i<ci->maps;i++){
    oggpack_write(opb,ci->map_type[i],16);
    _mapping_P[ci->map_type[i]]->pack(vi,ci->map_param[i],opb);
  }

  /* modes */
  oggpack_write(opb,ci->modes-1,6);
  for(i=0;i<ci->modes;i++){
    oggpack_write(opb,ci->mode_param[i]->blockflag,1);
    oggpack_write(opb,ci->mode_param[i]->windowtype,16);
    oggpack_write(opb,ci->mode_param[i]->transformtype,16);
    oggpack_write(opb,ci->mode_param[i]->mapping,8);
  }
  oggpack_write(opb,1,1);

  return(0);
err_out:
  return(-1);
}

int vorbis_commentheader_out(vorbis_comment *vc,
                                          ogg_packet *op){

  oggpack_buffer opb;

  oggpack_writeinit(&opb);
  if(_vorbis_pack_comment(&opb,vc)){
    oggpack_writeclear(&opb);
    return OV_EIMPL;
  }

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

  op->bytes=oggpack_bytes(&opb);
  op->b_o_s=0;
  op->e_o_s=0;
  op->granulepos=0;
  op->packetno=1;

  oggpack_writeclear(&opb);
  return 0;
}

int vorbis_analysis_headerout(vorbis_dsp_state *v,
                              vorbis_comment *vc,
                              ogg_packet *op,
                              ogg_packet *op_comm,
                              ogg_packet *op_code){
  int ret=OV_EIMPL;
  vorbis_info *vi=v->vi;
  oggpack_buffer opb;
  private_state *b=v->backend_state;

  if(!b||vi->channels<=0||vi->channels>256){
    b = NULL;
    ret=OV_EFAULT;
    goto err_out;
  }

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

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

  /* build the packet */
  if(b->header)_ogg_free(b->header);
  b->header=_ogg_malloc(oggpack_bytes(&opb));
  memcpy(b->header,opb.buffer,oggpack_bytes(&opb));
  op->packet=b->header;
  op->bytes=oggpack_bytes(&opb);
  op->b_o_s=1;
  op->e_o_s=0;
  op->granulepos=0;
  op->packetno=0;

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

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

  if(b->header1)_ogg_free(b->header1);
  b->header1=_ogg_malloc(oggpack_bytes(&opb));
  memcpy(b->header1,opb.buffer,oggpack_bytes(&opb));
  op_comm->packet=b->header1;
  op_comm->bytes=oggpack_bytes(&opb);
  op_comm->b_o_s=0;
  op_comm->e_o_s=0;
  op_comm->granulepos=0;
  op_comm->packetno=1;

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

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

  if(b->header2)_ogg_free(b->header2);
  b->header2=_ogg_malloc(oggpack_bytes(&opb));
  memcpy(b->header2,opb.buffer,oggpack_bytes(&opb));
  op_code->packet=b->header2;
  op_code->bytes=oggpack_bytes(&opb);
  op_code->b_o_s=0;
  op_code->e_o_s=0;
  op_code->granulepos=0;
  op_code->packetno=2;

  oggpack_writeclear(&opb);
  return(0);
 err_out:
  memset(op,0,sizeof(*op));
  memset(op_comm,0,sizeof(*op_comm));
  memset(op_code,0,sizeof(*op_code));

  if(b){
    if(vi->channels>0)oggpack_writeclear(&opb);
    if(b->header)_ogg_free(b->header);
    if(b->header1)_ogg_free(b->header1);
    if(b->header2)_ogg_free(b->header2);
    b->header=NULL;
    b->header1=NULL;
    b->header2=NULL;
  }
  return(ret);
}

double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){
  if(granulepos == -1) return -1;

  /* We're not guaranteed a 64 bit unsigned type everywhere, so we
     have to put the unsigned granpo in a signed type. */
  if(granulepos>=0){
    return((double)granulepos/v->vi->rate);
  }else{
    ogg_int64_t granuleoff=0xffffffff;
    granuleoff<<=31;
    granuleoff|=0x7ffffffff;
    return(((double)granulepos+2+granuleoff+granuleoff)/v->vi->rate);
  }
}

const char *vorbis_version_string(void){
  return GENERAL_VENDOR_STRING;
}

Coverage Report

Created: 2024-09-06 07:53

Line	Count	Source (jump to first uncovered line)
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	0	#define GENERAL_VENDOR_STRING "Xiph.Org libVorbis 1.3.7"
33	0	#define ENCODE_VENDOR_STRING "Xiph.Org libVorbis I 20200704 (Reducing Environment)"
34
35		/* helpers */
36	0	static void _v_writestring(oggpack_buffer o,const char s, int bytes){
37
38	0	while(bytes--){
39	0	oggpack_write(o,*s++,8);
40	0	}
41	0	}
42
43	0	static void _v_readstring(oggpack_buffer o,char buf,int bytes){
44	0	while(bytes--){
45	0	*buf++=oggpack_read(o,8);
46	0	}
47	0	}
48
49	0	static int _v_toupper(int c) {
50	0	return (c >= 'a' && c <= 'z') ? (c & ~('a' - 'A')) : c;
51	0	}
52
53	0	void vorbis_comment_init(vorbis_comment *vc){
54	0	memset(vc,0,sizeof(*vc));
55	0	}
56
57	0	void vorbis_comment_add(vorbis_comment vc,const char comment){
58	0	vc->user_comments=_ogg_realloc(vc->user_comments,
59	0	(vc->comments+2)sizeof(vc->user_comments));
60	0	vc->comment_lengths=_ogg_realloc(vc->comment_lengths,
61	0	(vc->comments+2)sizeof(vc->comment_lengths));
62	0	vc->comment_lengths[vc->comments]=strlen(comment);
63	0	vc->user_comments[vc->comments]=_ogg_malloc(vc->comment_lengths[vc->comments]+1);
64	0	strcpy(vc->user_comments[vc->comments], comment);
65	0	vc->comments++;
66	0	vc->user_comments[vc->comments]=NULL;
67	0	}
68
69	0	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	0	char *comment=_ogg_malloc(strlen(tag)+strlen(contents)+2);
72	0	strcpy(comment, tag);
73	0	strcat(comment, "=");
74	0	strcat(comment, contents);
75	0	vorbis_comment_add(vc, comment);
76	0	_ogg_free(comment);
77	0	}
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	0	static int tagcompare(const char s1, const char s2, int n){
82	0	int c=0;
83	0	while(c < n){
84	0	if(_v_toupper(s1[c]) != _v_toupper(s2[c]))
85	0	return !0;
86	0	c++;
87	0	}
88	0	return 0;
89	0	}
90
91	0	char vorbis_comment_query(vorbis_comment vc, const char *tag, int count){
92	0	long i;
93	0	int found = 0;
94	0	int taglen = strlen(tag)+1; /* +1 for the = we append */
95	0	char *fulltag = _ogg_malloc(taglen+1);
96
97	0	strcpy(fulltag, tag);
98	0	strcat(fulltag, "=");
99
100	0	for(i=0;i<vc->comments;i++){
101	0	if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
102	0	if(count == found) {
103		/* We return a pointer to the data, not a copy */
104	0	_ogg_free(fulltag);
105	0	return vc->user_comments[i] + taglen;
106	0	} else {
107	0	found++;
108	0	}
109	0	}
110	0	}
111	0	_ogg_free(fulltag);
112	0	return NULL; /* didn't find anything */
113	0	}
114
115	0	int vorbis_comment_query_count(vorbis_comment vc, const char tag){
116	0	int i,count=0;
117	0	int taglen = strlen(tag)+1; /* +1 for the = we append */
118	0	char *fulltag = _ogg_malloc(taglen+1);
119	0	strcpy(fulltag,tag);
120	0	strcat(fulltag, "=");
121
122	0	for(i=0;i<vc->comments;i++){
123	0	if(!tagcompare(vc->user_comments[i], fulltag, taglen))
124	0	count++;
125	0	}
126
127	0	_ogg_free(fulltag);
128	0	return count;
129	0	}
130
131	0	void vorbis_comment_clear(vorbis_comment *vc){
132	0	if(vc){
133	0	long i;
134	0	if(vc->user_comments){
135	0	for(i=0;i<vc->comments;i++)
136	0	if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
137	0	_ogg_free(vc->user_comments);
138	0	}
139	0	if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
140	0	if(vc->vendor)_ogg_free(vc->vendor);
141	0	memset(vc,0,sizeof(*vc));
142	0	}
143	0	}
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	0	int vorbis_info_blocksize(vorbis_info *vi,int zo){
148	0	codec_setup_info *ci = vi->codec_setup;
149	0	return ci ? ci->blocksizes[zo] : -1;
150	0	}
151
152		/* used by synthesis, which has a full, alloced vi */
153	0	void vorbis_info_init(vorbis_info *vi){
154	0	memset(vi,0,sizeof(*vi));
155	0	vi->codec_setup=_ogg_calloc(1,sizeof(codec_setup_info));
156	0	}
157
158	0	void vorbis_info_clear(vorbis_info *vi){
159	0	codec_setup_info *ci=vi->codec_setup;
160	0	int i;
161
162	0	if(ci){
163
164	0	for(i=0;i<ci->modes;i++)
165	0	if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);
166
167	0	for(i=0;i<ci->maps;i++) /* unpack does the range checking */
168	0	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	0	_mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
172
173	0	for(i=0;i<ci->floors;i++) /* unpack does the range checking */
174	0	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	0	_floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
178
179	0	for(i=0;i<ci->residues;i++) /* unpack does the range checking */
180	0	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	0	_residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);
184
185	0	for(i=0;i<ci->books;i++){
186	0	if(ci->book_param[i]){
187		/* knows if the book was not alloced */
188	0	vorbis_staticbook_destroy(ci->book_param[i]);
189	0	}
190	0	if(ci->fullbooks)
191	0	vorbis_book_clear(ci->fullbooks+i);
192	0	}
193	0	if(ci->fullbooks)
194	0	_ogg_free(ci->fullbooks);
195
196	0	for(i=0;i<ci->psys;i++)
197	0	_vi_psy_free(ci->psy_param[i]);
198
199	0	_ogg_free(ci);
200	0	}
201
202	0	memset(vi,0,sizeof(*vi));
203	0	}
204
205		/* Header packing/unpacking ********************************************/
206
207	0	static int _vorbis_unpack_info(vorbis_info vi,oggpack_buffer opb){
208	0	codec_setup_info *ci=vi->codec_setup;
209	0	int bs;
210	0	if(!ci)return(OV_EFAULT);
211
212	0	vi->version=oggpack_read(opb,32);
213	0	if(vi->version!=0)return(OV_EVERSION);
214
215	0	vi->channels=oggpack_read(opb,8);
216	0	vi->rate=oggpack_read(opb,32);
217
218	0	vi->bitrate_upper=(ogg_int32_t)oggpack_read(opb,32);
219	0	vi->bitrate_nominal=(ogg_int32_t)oggpack_read(opb,32);
220	0	vi->bitrate_lower=(ogg_int32_t)oggpack_read(opb,32);
221
222	0	bs = oggpack_read(opb,4);
223	0	if(bs<0)goto err_out;
224	0	ci->blocksizes[0]=1<<bs;
225	0	bs = oggpack_read(opb,4);
226	0	if(bs<0)goto err_out;
227	0	ci->blocksizes[1]=1<<bs;
228
229	0	if(vi->rate<1)goto err_out;
230	0	if(vi->channels<1)goto err_out;
231	0	if(ci->blocksizes[0]<64)goto err_out;
232	0	if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
233	0	if(ci->blocksizes[1]>8192)goto err_out;
234
235	0	if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
236
237	0	return(0);
238	0	err_out:
239	0	vorbis_info_clear(vi);
240	0	return(OV_EBADHEADER);
241	0	}
242
243	0	static int _vorbis_unpack_comment(vorbis_comment vc,oggpack_buffer opb){
244	0	int i;
245	0	int vendorlen=oggpack_read(opb,32);
246	0	if(vendorlen<0)goto err_out;
247	0	if(vendorlen>opb->storage-8)goto err_out;
248	0	vc->vendor=_ogg_calloc(vendorlen+1,1);
249	0	_v_readstring(opb,vc->vendor,vendorlen);
250	0	i=oggpack_read(opb,32);
251	0	if(i<0)goto err_out;
252	0	if(i>((opb->storage-oggpack_bytes(opb))>>2))goto err_out;
253	0	vc->comments=i;
254	0	vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
255	0	vc->comment_lengths=_ogg_calloc(vc->comments+1, sizeof(*vc->comment_lengths));
256
257	0	for(i=0;i<vc->comments;i++){
258	0	int len=oggpack_read(opb,32);
259	0	if(len<0)goto err_out;
260	0	if(len>opb->storage-oggpack_bytes(opb))goto err_out;
261	0	vc->comment_lengths[i]=len;
262	0	vc->user_comments[i]=_ogg_calloc(len+1,1);
263	0	_v_readstring(opb,vc->user_comments[i],len);
264	0	}
265	0	if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
266
267	0	return(0);
268	0	err_out:
269	0	vorbis_comment_clear(vc);
270	0	return(OV_EBADHEADER);
271	0	}
272
273		/* all of the real encoding details are here. The modes, books,
274		everything */
275	0	static int _vorbis_unpack_books(vorbis_info vi,oggpack_buffer opb){
276	0	codec_setup_info *ci=vi->codec_setup;
277	0	int i;
278
279		/* codebooks */
280	0	ci->books=oggpack_read(opb,8)+1;
281	0	if(ci->books<=0)goto err_out;
282	0	for(i=0;i<ci->books;i++){
283	0	ci->book_param[i]=vorbis_staticbook_unpack(opb);
284	0	if(!ci->book_param[i])goto err_out;
285	0	}
286
287		/* time backend settings; hooks are unused */
288	0	{
289	0	int times=oggpack_read(opb,6)+1;
290	0	if(times<=0)goto err_out;
291	0	for(i=0;i<times;i++){
292	0	int test=oggpack_read(opb,16);
293	0	if(test<0 \|\| test>=VI_TIMEB)goto err_out;
294	0	}
295	0	}
296
297		/* floor backend settings */
298	0	ci->floors=oggpack_read(opb,6)+1;
299	0	if(ci->floors<=0)goto err_out;
300	0	for(i=0;i<ci->floors;i++){
301	0	ci->floor_type[i]=oggpack_read(opb,16);
302	0	if(ci->floor_type[i]<0 \|\| ci->floor_type[i]>=VI_FLOORB)goto err_out;
303	0	ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
304	0	if(!ci->floor_param[i])goto err_out;
305	0	}
306
307		/* residue backend settings */
308	0	ci->residues=oggpack_read(opb,6)+1;
309	0	if(ci->residues<=0)goto err_out;
310	0	for(i=0;i<ci->residues;i++){
311	0	ci->residue_type[i]=oggpack_read(opb,16);
312	0	if(ci->residue_type[i]<0 \|\| ci->residue_type[i]>=VI_RESB)goto err_out;
313	0	ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
314	0	if(!ci->residue_param[i])goto err_out;
315	0	}
316
317		/* map backend settings */
318	0	ci->maps=oggpack_read(opb,6)+1;
319	0	if(ci->maps<=0)goto err_out;
320	0	for(i=0;i<ci->maps;i++){
321	0	ci->map_type[i]=oggpack_read(opb,16);
322	0	if(ci->map_type[i]<0 \|\| ci->map_type[i]>=VI_MAPB)goto err_out;
323	0	ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
324	0	if(!ci->map_param[i])goto err_out;
325	0	}
326
327		/* mode settings */
328	0	ci->modes=oggpack_read(opb,6)+1;
329	0	if(ci->modes<=0)goto err_out;
330	0	for(i=0;i<ci->modes;i++){
331	0	ci->mode_param[i]=_ogg_calloc(1,sizeof(*ci->mode_param[i]));
332	0	ci->mode_param[i]->blockflag=oggpack_read(opb,1);
333	0	ci->mode_param[i]->windowtype=oggpack_read(opb,16);
334	0	ci->mode_param[i]->transformtype=oggpack_read(opb,16);
335	0	ci->mode_param[i]->mapping=oggpack_read(opb,8);
336
337	0	if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
338	0	if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
339	0	if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
340	0	if(ci->mode_param[i]->mapping<0)goto err_out;
341	0	}
342
343	0	if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */
344
345	0	return(0);
346	0	err_out:
347	0	vorbis_info_clear(vi);
348	0	return(OV_EBADHEADER);
349	0	}
350
351		/* Is this packet a vorbis ID header? */
352	0	int vorbis_synthesis_idheader(ogg_packet *op){
353	0	oggpack_buffer opb;
354	0	char buffer[6];
355
356	0	if(op){
357	0	oggpack_readinit(&opb,op->packet,op->bytes);
358
359	0	if(!op->b_o_s)
360	0	return(0); /* Not the initial packet */
361
362	0	if(oggpack_read(&opb,8) != 1)
363	0	return 0; /* not an ID header */
364
365	0	memset(buffer,0,6);
366	0	_v_readstring(&opb,buffer,6);
367	0	if(memcmp(buffer,"vorbis",6))
368	0	return 0; /* not vorbis */
369
370	0	return 1;
371	0	}
372
373	0	return 0;
374	0	}
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	0	int vorbis_synthesis_headerin(vorbis_info vi,vorbis_comment vc,ogg_packet *op){
382	0	oggpack_buffer opb;
383
384	0	if(op){
385	0	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	0	{
390	0	char buffer[6];
391	0	int packtype=oggpack_read(&opb,8);
392	0	memset(buffer,0,6);
393	0	_v_readstring(&opb,buffer,6);
394	0	if(memcmp(buffer,"vorbis",6)){
395		/* not a vorbis header */
396	0	return(OV_ENOTVORBIS);
397	0	}
398	0	switch(packtype){
399	0	case 0x01: /* least significant bit is read first */
400	0	if(!op->b_o_s){
401		/* Not the initial packet */
402	0	return(OV_EBADHEADER);
403	0	}
404	0	if(vi->rate!=0){
405		/* previously initialized info header */
406	0	return(OV_EBADHEADER);
407	0	}
408
409	0	return(_vorbis_unpack_info(vi,&opb));
410
411	0	case 0x03: /* least significant bit is read first */
412	0	if(vi->rate==0){
413		/* um... we didn't get the initial header */
414	0	return(OV_EBADHEADER);
415	0	}
416	0	if(vc->vendor!=NULL){
417		/* previously initialized comment header */
418	0	return(OV_EBADHEADER);
419	0	}
420
421	0	return(_vorbis_unpack_comment(vc,&opb));
422
423	0	case 0x05: /* least significant bit is read first */
424	0	if(vi->rate==0 \|\| vc->vendor==NULL){
425		/* um... we didn;t get the initial header or comments yet */
426	0	return(OV_EBADHEADER);
427	0	}
428	0	if(vi->codec_setup==NULL){
429		/* improperly initialized vorbis_info */
430	0	return(OV_EFAULT);
431	0	}
432	0	if(((codec_setup_info *)vi->codec_setup)->books>0){
433		/* previously initialized setup header */
434	0	return(OV_EBADHEADER);
435	0	}
436
437	0	return(_vorbis_unpack_books(vi,&opb));
438
439	0	default:
440		/* Not a valid vorbis header type */
441	0	return(OV_EBADHEADER);
442	0	break;
443	0	}
444	0	}
445	0	}
446	0	return(OV_EBADHEADER);
447	0	}
448
449		/* pack side **********************************************************/
450
451	0	static int _vorbis_pack_info(oggpack_buffer opb,vorbis_info vi){
452	0	codec_setup_info *ci=vi->codec_setup;
453	0	if(!ci\|\|
454	0	ci->blocksizes[0]<64\|\|
455	0	ci->blocksizes[1]<ci->blocksizes[0]){
456	0	return(OV_EFAULT);
457	0	}
458
459		/* preamble */
460	0	oggpack_write(opb,0x01,8);
461	0	_v_writestring(opb,"vorbis", 6);
462
463		/* basic information about the stream */
464	0	oggpack_write(opb,0x00,32);
465	0	oggpack_write(opb,vi->channels,8);
466	0	oggpack_write(opb,vi->rate,32);
467
468	0	oggpack_write(opb,vi->bitrate_upper,32);
469	0	oggpack_write(opb,vi->bitrate_nominal,32);
470	0	oggpack_write(opb,vi->bitrate_lower,32);
471
472	0	oggpack_write(opb,ov_ilog(ci->blocksizes[0]-1),4);
473	0	oggpack_write(opb,ov_ilog(ci->blocksizes[1]-1),4);
474	0	oggpack_write(opb,1,1);
475
476	0	return(0);
477	0	}
478
479	0	static int _vorbis_pack_comment(oggpack_buffer opb,vorbis_comment vc){
480	0	int bytes = strlen(ENCODE_VENDOR_STRING);
481
482		/* preamble */
483	0	oggpack_write(opb,0x03,8);
484	0	_v_writestring(opb,"vorbis", 6);
485
486		/* vendor */
487	0	oggpack_write(opb,bytes,32);
488	0	_v_writestring(opb,ENCODE_VENDOR_STRING, bytes);
489
490		/* comments */
491
492	0	oggpack_write(opb,vc->comments,32);
493	0	if(vc->comments){
494	0	int i;
495	0	for(i=0;i<vc->comments;i++){
496	0	if(vc->user_comments[i]){
497	0	oggpack_write(opb,vc->comment_lengths[i],32);
498	0	_v_writestring(opb,vc->user_comments[i], vc->comment_lengths[i]);
499	0	}else{
500	0	oggpack_write(opb,0,32);
501	0	}
502	0	}
503	0	}
504	0	oggpack_write(opb,1,1);
505
506	0	return(0);
507	0	}
508
509	0	static int _vorbis_pack_books(oggpack_buffer opb,vorbis_info vi){
510	0	codec_setup_info *ci=vi->codec_setup;
511	0	int i;
512	0	if(!ci)return(OV_EFAULT);
513
514	0	oggpack_write(opb,0x05,8);
515	0	_v_writestring(opb,"vorbis", 6);
516
517		/* books */
518	0	oggpack_write(opb,ci->books-1,8);
519	0	for(i=0;i<ci->books;i++)
520	0	if(vorbis_staticbook_pack(ci->book_param[i],opb))goto err_out;
521
522		/* times; hook placeholders */
523	0	oggpack_write(opb,0,6);
524	0	oggpack_write(opb,0,16);
525
526		/* floors */
527	0	oggpack_write(opb,ci->floors-1,6);
528	0	for(i=0;i<ci->floors;i++){
529	0	oggpack_write(opb,ci->floor_type[i],16);
530	0	if(_floor_P[ci->floor_type[i]]->pack)
531	0	_floor_P[ci->floor_type[i]]->pack(ci->floor_param[i],opb);
532	0	else
533	0	goto err_out;
534	0	}
535
536		/* residues */
537	0	oggpack_write(opb,ci->residues-1,6);
538	0	for(i=0;i<ci->residues;i++){
539	0	oggpack_write(opb,ci->residue_type[i],16);
540	0	_residue_P[ci->residue_type[i]]->pack(ci->residue_param[i],opb);
541	0	}
542
543		/* maps */
544	0	oggpack_write(opb,ci->maps-1,6);
545	0	for(i=0;i<ci->maps;i++){
546	0	oggpack_write(opb,ci->map_type[i],16);
547	0	_mapping_P[ci->map_type[i]]->pack(vi,ci->map_param[i],opb);
548	0	}
549
550		/* modes */
551	0	oggpack_write(opb,ci->modes-1,6);
552	0	for(i=0;i<ci->modes;i++){
553	0	oggpack_write(opb,ci->mode_param[i]->blockflag,1);
554	0	oggpack_write(opb,ci->mode_param[i]->windowtype,16);
555	0	oggpack_write(opb,ci->mode_param[i]->transformtype,16);
556	0	oggpack_write(opb,ci->mode_param[i]->mapping,8);
557	0	}
558	0	oggpack_write(opb,1,1);
559
560	0	return(0);
561	0	err_out:
562	0	return(-1);
563	0	}
564
565		int vorbis_commentheader_out(vorbis_comment *vc,
566	0	ogg_packet *op){
567
568	0	oggpack_buffer opb;
569
570	0	oggpack_writeinit(&opb);
571	0	if(_vorbis_pack_comment(&opb,vc)){
572	0	oggpack_writeclear(&opb);
573	0	return OV_EIMPL;
574	0	}
575
576	0	op->packet = _ogg_malloc(oggpack_bytes(&opb));
577	0	memcpy(op->packet, opb.buffer, oggpack_bytes(&opb));
578
579	0	op->bytes=oggpack_bytes(&opb);
580	0	op->b_o_s=0;
581	0	op->e_o_s=0;
582	0	op->granulepos=0;
583	0	op->packetno=1;
584
585	0	oggpack_writeclear(&opb);
586	0	return 0;
587	0	}
588
589		int vorbis_analysis_headerout(vorbis_dsp_state *v,
590		vorbis_comment *vc,
591		ogg_packet *op,
592		ogg_packet *op_comm,
593	0	ogg_packet *op_code){
594	0	int ret=OV_EIMPL;
595	0	vorbis_info *vi=v->vi;
596	0	oggpack_buffer opb;
597	0	private_state *b=v->backend_state;
598
599	0	if(!b\|\|vi->channels<=0\|\|vi->channels>256){
600	0	b = NULL;
601	0	ret=OV_EFAULT;
602	0	goto err_out;
603	0	}
604
605		/* first header packet **********************************************/
606
607	0	oggpack_writeinit(&opb);
608	0	if(_vorbis_pack_info(&opb,vi))goto err_out;
609
610		/* build the packet */
611	0	if(b->header)_ogg_free(b->header);
612	0	b->header=_ogg_malloc(oggpack_bytes(&opb));
613	0	memcpy(b->header,opb.buffer,oggpack_bytes(&opb));
614	0	op->packet=b->header;
615	0	op->bytes=oggpack_bytes(&opb);
616	0	op->b_o_s=1;
617	0	op->e_o_s=0;
618	0	op->granulepos=0;
619	0	op->packetno=0;
620
621		/* second header packet (comments) **********************************/
622
623	0	oggpack_reset(&opb);
624	0	if(_vorbis_pack_comment(&opb,vc))goto err_out;
625
626	0	if(b->header1)_ogg_free(b->header1);
627	0	b->header1=_ogg_malloc(oggpack_bytes(&opb));
628	0	memcpy(b->header1,opb.buffer,oggpack_bytes(&opb));
629	0	op_comm->packet=b->header1;
630	0	op_comm->bytes=oggpack_bytes(&opb);
631	0	op_comm->b_o_s=0;
632	0	op_comm->e_o_s=0;
633	0	op_comm->granulepos=0;
634	0	op_comm->packetno=1;
635
636		/* third header packet (modes/codebooks) ****************************/
637
638	0	oggpack_reset(&opb);
639	0	if(_vorbis_pack_books(&opb,vi))goto err_out;
640
641	0	if(b->header2)_ogg_free(b->header2);
642	0	b->header2=_ogg_malloc(oggpack_bytes(&opb));
643	0	memcpy(b->header2,opb.buffer,oggpack_bytes(&opb));
644	0	op_code->packet=b->header2;
645	0	op_code->bytes=oggpack_bytes(&opb);
646	0	op_code->b_o_s=0;
647	0	op_code->e_o_s=0;
648	0	op_code->granulepos=0;
649	0	op_code->packetno=2;
650
651	0	oggpack_writeclear(&opb);
652	0	return(0);
653	0	err_out:
654	0	memset(op,0,sizeof(*op));
655	0	memset(op_comm,0,sizeof(*op_comm));
656	0	memset(op_code,0,sizeof(*op_code));
657
658	0	if(b){
659	0	if(vi->channels>0)oggpack_writeclear(&opb);
660	0	if(b->header)_ogg_free(b->header);
661	0	if(b->header1)_ogg_free(b->header1);
662	0	if(b->header2)_ogg_free(b->header2);
663	0	b->header=NULL;
664	0	b->header1=NULL;
665	0	b->header2=NULL;
666	0	}
667	0	return(ret);
668	0	}
669
670	0	double vorbis_granule_time(vorbis_dsp_state *v,ogg_int64_t granulepos){
671	0	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	0	if(granulepos>=0){
676	0	return((double)granulepos/v->vi->rate);
677	0	}else{
678	0	ogg_int64_t granuleoff=0xffffffff;
679	0	granuleoff<<=31;
680	0	granuleoff\|=0x7ffffffff;
681	0	return(((double)granulepos+2+granuleoff+granuleoff)/v->vi->rate);
682	0	}
683	0	}
684
685	0	const char *vorbis_version_string(void){
686	0	return GENERAL_VENDOR_STRING;
687	0	}