ifo_read.c

有关mpeg2的deocde代码

  return 1;
}


void ifoFree_VTS_PTT_SRPT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  if(ifofile->vts_ptt_srpt) {
    int i;
    for(i = 0; i < ifofile->vts_ptt_srpt->nr_of_srpts; i++)
      free(ifofile->vts_ptt_srpt->title[i].ptt);
    free(ifofile->vts_ptt_srpt->ttu_offset);
    free(ifofile->vts_ptt_srpt->title);
    free(ifofile->vts_ptt_srpt);
    ifofile->vts_ptt_srpt = 0;
  }
}


int ifoRead_PTL_MAIT(ifo_handle_t *ifofile) {
  ptl_mait_t *ptl_mait;
  int info_length;
  unsigned int i, j;

  if(!ifofile)
    return 0;
  
  if(!ifofile->vmgi_mat)
    return 0;
  
  if(ifofile->vmgi_mat->ptl_mait == 0)
    return 1;

  if(!DVDFileSeek_(ifofile->file, ifofile->vmgi_mat->ptl_mait * DVD_BLOCK_LEN))
    return 0;

  ptl_mait = (ptl_mait_t *)malloc(sizeof(ptl_mait_t));
  if(!ptl_mait)
    return 0;

  ifofile->ptl_mait = ptl_mait;

  if(!(DVDReadBytes(ifofile->file, ptl_mait, PTL_MAIT_SIZE))) {
    free(ptl_mait);
    ifofile->ptl_mait = 0;
    return 0;
  }

  B2N_16(ptl_mait->nr_of_countries);
  B2N_16(ptl_mait->nr_of_vtss);
  B2N_32(ptl_mait->last_byte);
  
  CHECK_VALUE(ptl_mait->nr_of_countries != 0);
  CHECK_VALUE(ptl_mait->nr_of_countries < 100); // ??
  CHECK_VALUE(ptl_mait->nr_of_vtss != 0);
  CHECK_VALUE(ptl_mait->nr_of_vtss < 100); // ??  
  CHECK_VALUE(ptl_mait->nr_of_countries * PTL_MAIT_COUNTRY_SIZE 
	      <= ptl_mait->last_byte + 1 - PTL_MAIT_SIZE);
  
  info_length = ptl_mait->nr_of_countries * sizeof(ptl_mait_country_t);
  ptl_mait->countries = (ptl_mait_country_t *)malloc(info_length);
  if(!ptl_mait->countries) {
    free(ptl_mait);
    ifofile->ptl_mait = 0;
    return 0;
  }
  
  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    if(!(DVDReadBytes(ifofile->file, &ptl_mait->countries[i], PTL_MAIT_COUNTRY_SIZE))) {
      fprintf(stderr, "libdvdread: Unable to read PTL_MAIT.\n");
      free(ptl_mait->countries);
      free(ptl_mait);
      ifofile->ptl_mait = 0;
      return 0;
    }
  }

  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    B2N_16(ptl_mait->countries[i].country_code);
    B2N_16(ptl_mait->countries[i].pf_ptl_mai_start_byte);
  }
  
  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    CHECK_ZERO(ptl_mait->countries[i].zero_1);
    CHECK_ZERO(ptl_mait->countries[i].zero_2);    
    CHECK_VALUE(ptl_mait->countries[i].pf_ptl_mai_start_byte
		+ 8*2 * (ptl_mait->nr_of_vtss + 1) <= ptl_mait->last_byte + 1);
  }

  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    uint16_t *pf_temp;
    
    if(!DVDFileSeek_(ifofile->file, 
		     ifofile->vmgi_mat->ptl_mait * DVD_BLOCK_LEN
                     + ptl_mait->countries[i].pf_ptl_mai_start_byte)) {
      fprintf(stderr, "libdvdread: Unable to seak PTL_MAIT table.\n");
      free(ptl_mait->countries);
      free(ptl_mait);
      return 0;
    }
    info_length = (ptl_mait->nr_of_vtss + 1) * sizeof(pf_level_t);
    pf_temp = (uint16_t *)malloc(info_length);
    if(!pf_temp) {
      for(j = 0; j < i ; j++) {
         free(ptl_mait->countries[j].pf_ptl_mai);
      }
      free(ptl_mait->countries);
      free(ptl_mait);
      return 0;
    }
    if(!(DVDReadBytes(ifofile->file, pf_temp, info_length))) {
       fprintf(stderr, "libdvdread: Unable to read PTL_MAIT table.\n");
       free(pf_temp);
       for(j = 0; j < i ; j++) {
	  free(ptl_mait->countries[j].pf_ptl_mai);
       }
       free(ptl_mait->countries);
       free(ptl_mait);
       return 0;
    }
    for (j = 0; j < ((ptl_mait->nr_of_vtss + 1) * 8); j++) {
        B2N_16(pf_temp[j]);
    }
    ptl_mait->countries[i].pf_ptl_mai = (pf_level_t *)malloc(info_length);
    if(!ptl_mait->countries[i].pf_ptl_mai) {
      free(pf_temp);
      for(j = 0; j < i ; j++) {
	free(ptl_mait->countries[j].pf_ptl_mai);
      }
      free(ptl_mait->countries);
      free(ptl_mait);
      return 0;
    }
    { /* Transpose the array so we can use C indexing. */
      int level, vts;
      for(level = 0; level < 8; level++) {
	for(vts = 0; vts <= ptl_mait->nr_of_vtss; vts++) {
	  ptl_mait->countries[i].pf_ptl_mai[vts][level] =
	    pf_temp[(7-level)*(ptl_mait->nr_of_vtss+1) + vts];
	}
      }
      free(pf_temp);
    }
  }
  return 1;
}

void ifoFree_PTL_MAIT(ifo_handle_t *ifofile) {
  unsigned int i;
  
  if(!ifofile)
    return;
  
  if(ifofile->ptl_mait) {
    for(i = 0; i < ifofile->ptl_mait->nr_of_countries; i++) {
       free(ifofile->ptl_mait->countries[i].pf_ptl_mai);
    }
    free(ifofile->ptl_mait->countries);
    free(ifofile->ptl_mait);
    ifofile->ptl_mait = 0;
  }
}

int ifoRead_VTS_TMAPT(ifo_handle_t *ifofile) {
  vts_tmapt_t *vts_tmapt;
  uint32_t *vts_tmap_srp;
  unsigned int offset;
  int info_length;
  unsigned int i, j;
  
  if(!ifofile)
    return 0;

  if(!ifofile->vtsi_mat)
    return 0;

  if(ifofile->vtsi_mat->vts_tmapt == 0) { /* optional(?) */
    ifofile->vts_tmapt = NULL;
    fprintf(stderr,"Please send bug report - no VTS_TMAPT ?? \n");
    return 1;
  }
  
  offset = ifofile->vtsi_mat->vts_tmapt * DVD_BLOCK_LEN;
  
  if(!DVDFileSeek_(ifofile->file, offset)) 
    return 0;
  
  vts_tmapt = (vts_tmapt_t *)malloc(sizeof(vts_tmapt_t));
  if(!vts_tmapt)
    return 0;
  
  ifofile->vts_tmapt = vts_tmapt;
  
  if(!(DVDReadBytes(ifofile->file, vts_tmapt, VTS_TMAPT_SIZE))) {
    fprintf(stderr, "libdvdread: Unable to read VTS_TMAPT.\n");
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  B2N_16(vts_tmapt->nr_of_tmaps);
  B2N_32(vts_tmapt->last_byte);
  
  CHECK_ZERO(vts_tmapt->zero_1);
  
  info_length = vts_tmapt->nr_of_tmaps * 4;
  
  vts_tmap_srp = (uint32_t *)malloc(info_length);
  if(!vts_tmap_srp) {
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  vts_tmapt->tmap_offset = vts_tmap_srp;
  
  if(!(DVDReadBytes(ifofile->file, vts_tmap_srp, info_length))) {
    fprintf(stderr, "libdvdread: Unable to read VTS_TMAPT.\n");
    free(vts_tmap_srp);
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  for (i = 0; i < vts_tmapt->nr_of_tmaps; i++) {
     B2N_32(vts_tmap_srp[i]); 
  }

  
  info_length = vts_tmapt->nr_of_tmaps * sizeof(vts_tmap_t);
  
  vts_tmapt->tmap = (vts_tmap_t *)malloc(info_length);
  if(!vts_tmapt->tmap) {
    free(vts_tmap_srp);
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  memset(vts_tmapt->tmap, 0, info_length); /* So ifoFree_VTS_TMAPT works. */
  
  for(i = 0; i < vts_tmapt->nr_of_tmaps; i++) {
    if(!DVDFileSeek_(ifofile->file, offset + vts_tmap_srp[i])) {
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }

    if(!(DVDReadBytes(ifofile->file, &vts_tmapt->tmap[i], VTS_TMAP_SIZE))) {
      fprintf(stderr, "libdvdread: Unable to read VTS_TMAP.\n");
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }
    
    B2N_16(vts_tmapt->tmap[i].nr_of_entries);
    CHECK_ZERO(vts_tmapt->tmap[i].zero_1);
    
    if(vts_tmapt->tmap[i].nr_of_entries == 0) { /* Early out if zero entries */
      vts_tmapt->tmap[i].map_ent = NULL;
      continue;
    }
    
    info_length = vts_tmapt->tmap[i].nr_of_entries * sizeof(map_ent_t);
    
    vts_tmapt->tmap[i].map_ent = (map_ent_t *)malloc(info_length);
    if(!vts_tmapt->tmap[i].map_ent) {
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }

    if(!(DVDReadBytes(ifofile->file, vts_tmapt->tmap[i].map_ent, info_length))) {
      fprintf(stderr, "libdvdread: Unable to read VTS_TMAP_ENT.\n");
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }
    
    for(j = 0; j < vts_tmapt->tmap[i].nr_of_entries; j++)
      B2N_32(vts_tmapt->tmap[i].map_ent[j]);
  }    
  
  return 1;
}

void ifoFree_VTS_TMAPT(ifo_handle_t *ifofile) {
  unsigned int i;
  
  if(!ifofile)
    return;
  
  if(ifofile->vts_tmapt) {  
    for(i = 0; i < ifofile->vts_tmapt->nr_of_tmaps; i++)
      if(ifofile->vts_tmapt->tmap[i].map_ent)
	free(ifofile->vts_tmapt->tmap[i].map_ent);
    free(ifofile->vts_tmapt->tmap);
    free(ifofile->vts_tmapt->tmap_offset);
    free(ifofile->vts_tmapt);
    ifofile->vts_tmapt = NULL;
  }
}


int ifoRead_TITLE_C_ADT(ifo_handle_t *ifofile) {

  if(!ifofile)
    return 0;

  if(!ifofile->vtsi_mat)
    return 0;

  if(ifofile->vtsi_mat->vts_c_adt == 0) /* mandatory */
    return 0;

  ifofile->vts_c_adt = (c_adt_t *)malloc(sizeof(c_adt_t));
  if(!ifofile->vts_c_adt)
    return 0;

  if(!ifoRead_C_ADT_internal(ifofile, ifofile->vts_c_adt, 
                             ifofile->vtsi_mat->vts_c_adt)) {
    free(ifofile->vts_c_adt);
    ifofile->vts_c_adt = 0;
    return 0;
  }

  return 1;
}

int ifoRead_C_ADT(ifo_handle_t *ifofile) {
  unsigned int sector;

  if(!ifofile)
    return 0;
  
  if(ifofile->vmgi_mat) {
    if(ifofile->vmgi_mat->vmgm_c_adt == 0)
      return 1;
    sector = ifofile->vmgi_mat->vmgm_c_adt;
  } else if(ifofile->vtsi_mat) {
    if(ifofile->vtsi_mat->vtsm_c_adt == 0)
      return 1;
    sector = ifofile->vtsi_mat->vtsm_c_adt;
  } else {
    return 0;
  }
  
  ifofile->menu_c_adt = (c_adt_t *)malloc(sizeof(c_adt_t));
  if(!ifofile->menu_c_adt)
    return 0;

  if(!ifoRead_C_ADT_internal(ifofile, ifofile->menu_c_adt, sector)) {
    free(ifofile->menu_c_adt);
    ifofile->menu_c_adt = 0;
    return 0;
  }

  return 1;
}

static int ifoRead_C_ADT_internal(ifo_handle_t *ifofile, 
                                  c_adt_t *c_adt, unsigned int sector) {
  int i, info_length;

  if(!DVDFileSeek_(ifofile->file, sector * DVD_BLOCK_LEN))
    return 0;

  if(!(DVDReadBytes(ifofile->file, c_adt, C_ADT_SIZE)))
    return 0;

  B2N_16(c_adt->nr_of_vobs);
  B2N_32(c_adt->last_byte);
  
  info_length = c_adt->last_byte + 1 - C_ADT_SIZE;
  
  CHECK_ZERO(c_adt->zero_1);
  /* assert(c_adt->nr_of_vobs > 0);  
     Magic Knight Rayearth Daybreak is mastered very strange and has 
     Titles with a VOBS that has no cells. */
  CHECK_VALUE(info_length % sizeof(cell_adr_t) == 0);
  
  /* assert(info_length / sizeof(cell_adr_t) >= c_adt->nr_of_vobs);
     Enemy of the State region 2 (de) has Titles where nr_of_vobs field
     is to high, they high ones are never referenced though. */
  if(info_length / sizeof(cell_adr_t) < c_adt->nr_of_vobs) {
    fprintf(stderr, "libdvdread: *C_ADT nr_of_vobs > avaiable info entries\n");
    c_adt->nr_of_vobs = info_length / sizeof(cell_adr_t);
  }
  
  c_adt->cell_adr_table = (cell_adr_t *)malloc(info_length);
  if(!c_adt->cell_adr_table)
    return 0;

  if(info_length && 
     !(DVDReadBytes(ifofile->file, c_adt->cell_adr_table, info_length))) {
    free(c_adt->cell_adr_table);
    return 0;
  }

  for(i = 0; i < info_length/sizeof(cell_adr_t); i++) {
    B2N_16(c_adt->cell_adr_table[i].vob_id);
    B2N_32(c_adt->cell_adr_table[i].start_sector);
    B2N_32(c_adt->cell_adr_table[i].last_sector);

    CHECK_ZERO(c_adt->cell_adr_table[i].zero_1);
    CHECK_VALUE(c_adt->cell_adr_table[i].vob_id > 0);
    CHECK_VALUE(c_adt->cell_adr_table[i].vob_id <= c_adt->nr_of_vobs);
    CHECK_VALUE(c_adt->cell_adr_table[i].cell_id > 0);
    CHECK_VALUE(c_adt->cell_adr_table[i].start_sector < 
	   c_adt->cell_adr_table[i].last_sector);
  }

  return 1;
}


static void ifoFree_C_ADT_internal(c_adt_t *c_adt) {
  if(c_adt) {
    free(c_adt->cell_adr_table);
    free(c_adt);
  }
}

void ifoFree_C_ADT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  ifoFree_C_ADT_internal(ifofile->menu_c_adt);
  ifofile->menu_c_adt = 0;
}

void ifoFree_TITLE_C_ADT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  ifoFree_C_ADT_internal(ifofile->vts_c_adt);
  ifofile->vts_c_adt = 0;
}

int ifoRead_TITLE_VOBU_ADMAP(ifo_handle_t *ifofile) {
  if(!ifofile)
    return 0;

  if(!ifofile->vtsi_mat)
    return 0;
  
  if(ifofile->vtsi_mat->vts_vobu_admap == 0) /* mandatory */
    return 0;
  
  ifofile->vts_vobu_admap = (vobu_admap_t *)malloc(sizeof(vobu_admap_t));
  if(!ifofile->vts_vobu_admap)
    return 0;

  if(!ifoRead_VOBU_ADMAP_internal(ifofile, ifofile->vts_vobu_admap,
                                  ifofile->vtsi_mat->vts_vobu_admap)) {
    free(ifofile->vts_vobu_admap);
    ifofile->vts_vobu_admap = 0;
    return 0;
  }

  return 1;
}

int ifoRead_VOBU_ADMAP(ifo_handle_t *ifofile) {
  unsigned int sector;

  if(!ifofile)
    return 0;
     
  if(ifofile->vmgi_mat) {
    if(ifofile->vmgi_mat->vmgm_vobu_admap == 0)
      return 1;
    sector = ifofile->vmgi_mat->vmgm_vobu_admap;
  } else if(ifofile->vtsi_mat) {
    if(ifofile->vtsi_mat->vtsm_vobu_admap == 0)
      return 1;
    sector = ifofile->vtsi_mat->vtsm_vobu_admap;
  } else {
    return 0;
  }
  
  ifofile->menu_vobu_admap = (vobu_admap_t *)malloc(sizeof(vobu_admap_t));
  if(!ifofile->menu_vobu_admap)
    return 0;
  
  if(!ifoRead_VOBU_ADMAP_internal(ifofile, ifofile->menu_vobu_admap, sector)) {
    free(ifofile->menu_vobu_admap);
    ifofile->menu_vobu_admap = 0;
    return 0;
  }

  return 1;
}

static int ifoRead_VOBU_ADMAP_internal(ifo_handle_t *ifofile, 
                                       vobu_admap_t *vobu_admap, 
				       unsigned int sector) {
  unsigned int i;
  int info_length;

  if(!DVDFileSeek_(ifofile->file, sector * DVD_BLOCK_LEN))
    return 0;

  if(!(DVDReadBytes(ifofile->file, vobu_admap, VOBU_ADMAP_SIZE)))
    return 0;

  B2N_32(vobu_admap->last_byte);
  
  info_length = vobu_admap->last_byte + 1 - VOBU_ADMAP_SIZE;