info.c

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/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003    *
 * BY THE Xiph.Org FOUNDATION http://www.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 <ctype.h>
#include "ogg.h"
#include "ivorbiscodec.h"
#include "codec_internal.h"
#include "codebook.h"
#include "registry.h"
#include "window.h"
#include "misc.h"
#include "os.h"

/* helpers */
static void _v_readstring(oggpack_buffer *o, char *buf, int bytes)
{       
  while (bytes--)
  {
    *buf++ = (char)oggpack_read(o, 8);
  }
}
void vorbis_comment_init(vorbis_comment *vc)
{       
  memset(vc, 0, sizeof(*vc));
}
/* 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 (toupper(s1[c]) != toupper(s2[c]))
      return !0;
    c++;
  }
  return 0;
}
char *vorbis_comment_query(vorbis_comment *vc, char *tag, int count)
{       
  long            i;
  int             found = 0;
  int             taglen = strlen(tag) + 1; /* +1 for the = we append */
  char            *fulltag = (char *) alloca(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 */
        return vc->user_comments[i] + taglen;
      else
        found++;
    }
  }
  return NULL; /* didn't find anything */
}
int vorbis_comment_query_count(vorbis_comment *vc, char *tag)
{       
  int             i, count = 0;
  int             taglen = strlen(tag) + 1; /* +1 for the = we append */
  char            *fulltag = (char *) alloca(taglen + 1);

  strcpy(fulltag, tag);
  strcat(fulltag, "=");
  for (i = 0; i < vc->comments; i++)
  {
    if (!tagcompare(vc->user_comments[i], fulltag, taglen))
      count++;
  }
  return count;
}
void vorbis_comment_clear(vorbis_comment *vc)
{       
  if (vc)
  {
    long            i;

    for (i = 0; i < vc->comments; i++)
    if (vc->user_comments[i])
      _ogg_free(vc->user_comments[i]);
    if (vc->user_comments)
      _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 guarantted 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 = (codec_setup_info *) 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 = (codec_setup_info *) _ogg_calloc(1, sizeof(codec_setup_info));
}
void vorbis_info_clear(vorbis_info *vi)
{       
  codec_setup_info *ci = (codec_setup_info *) 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 */
    _mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
    for (i = 0; i < ci->floors; i++) /* unpack does the range checking */
    _floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
    for (i = 0; i < ci->residues; i++) /* unpack does the range checking */
    _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);
    _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 = (codec_setup_info *) vi->codec_setup;

  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 = oggpack_read(opb, 32);
  vi->bitrate_nominal = oggpack_read(opb, 32);
  vi->bitrate_lower = oggpack_read(opb, 32);
  ci->blocksizes[0] = 1 << oggpack_read(opb, 4);
  ci->blocksizes[1] = 1 << oggpack_read(opb, 4);
  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;
  vc->vendor = (char *) _ogg_calloc(vendorlen + 1, 1);
  _v_readstring(opb, vc->vendor, vendorlen);
  vc->comments = oggpack_read(opb, 32);
  if (vc->comments < 0)
    goto err_out;
  vc->user_comments = (char * *) _ogg_calloc(vc->comments + 1, sizeof(*vc->user_comments));
  vc->comment_lengths = (int *) _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;
    vc->comment_lengths[i] = len;
    vc->user_comments[i] = (char *) _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 = (codec_setup_info *) vi->codec_setup;
  int             i;

  if (!ci)
    return (OV_EFAULT);
  /* codebooks */
  ci->books = oggpack_read(opb, 8) + 1;
  /*ci->book_param=_ogg_calloc(ci->books,sizeof(*ci->book_param));*/
  for (i = 0; i < ci->books; i++)
  {
    ci->book_param[i] = (static_codebook *) _ogg_calloc(1, sizeof(*ci->book_param[i]));
    if (vorbis_staticbook_unpack(opb, ci->book_param[i]))
      goto err_out;
  }
  /* time backend settings */
  ci->times = oggpack_read(opb, 6) + 1;
  /*ci->time_type=_ogg_malloc(ci->times*sizeof(*ci->time_type));*/
  /*ci->time_param=_ogg_calloc(ci->times,sizeof(void *));*/
  for (i = 0; i < ci->times; i++)
  {
    ci->time_type[i] = oggpack_read(opb, 16);
    if (ci->time_type[i] < 0 || ci->time_type[i] >= VI_TIMEB)
      goto err_out;
    /* ci->time_param[i]=_time_P[ci->time_type[i]]->unpack(vi,opb);
       Vorbis I has no time backend */
    /*if(!ci->time_param[i])goto err_out;*/
  }
  /* floor backend settings */
  ci->floors = oggpack_read(opb, 6) + 1;
  /*ci->floor_type=_ogg_malloc(ci->floors*sizeof(*ci->floor_type));*/
  /*ci->floor_param=_ogg_calloc(ci->floors,sizeof(void *));*/
  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;
  /*ci->residue_type=_ogg_malloc(ci->residues*sizeof(*ci->residue_type));*/
  /*ci->residue_param=_ogg_calloc(ci->residues,sizeof(void *));*/
  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;
  /*ci->map_type=_ogg_malloc(ci->maps*sizeof(*ci->map_type));*/
  /*ci->map_param=_ogg_calloc(ci->maps,sizeof(void *));*/
  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;
  /*vi->mode_param=_ogg_calloc(vi->modes,sizeof(void *));*/
  for (i = 0; i < ci->modes; i++)
  {
    ci->mode_param[i] = (vorbis_info_mode *) _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 (oggpack_read(opb, 1) != 1)
    goto err_out; /* top level EOP check */

  return (0);
err_out:
  vorbis_info_clear(vi);
  return (OV_EBADHEADER);
}
/* 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);
    /* 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);
        }
        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);
        }
        return (_vorbis_unpack_books(vi, &opb));
        default:
        /* Not a valid vorbis header type */
        return (OV_EBADHEADER);
        break;
      }
    }
  }
  return (OV_EBADHEADER);
}