ifo_read.c

有关mpeg2的deocde代码

/*
 * Copyright (C) 2000, 2001, 2002, 2003
 *               Bj鰎n Englund <[e-mail]>, 
 *               H錵an Hjort <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>

#include "bswap.h"
#include "ifo_types.h"
#include "ifo_read.h"
#include "dvd_reader.h"
#include "dvdread_internal.h"

#ifndef DVD_BLOCK_LEN
#define DVD_BLOCK_LEN 2048
#endif

#ifndef NDEBUG
#define CHECK_ZERO0(arg) \
  if(arg != 0) { \
    fprintf(stderr, "*** Zero check failed in %s:%i\n    for %s = 0x%x\n", \
            __FILE__, __LINE__, # arg, arg); \
  }
#define CHECK_ZERO(arg) \
  if(memcmp(my_friendly_zeros, &arg, sizeof(arg))) { \
    unsigned int i_CZ; \
    fprintf(stderr, "*** Zero check failed in %s:%i\n    for %s = 0x", \
            __FILE__, __LINE__, # arg ); \
    for(i_CZ = 0; i_CZ < sizeof(arg); i_CZ++) \
      fprintf(stderr, "%02x", *((uint8_t *)&arg + i_CZ)); \
    fprintf(stderr, "\n"); \
  }
static const uint8_t my_friendly_zeros[2048];
#else
#define CHECK_ZERO0(arg) (void)(arg)
#define CHECK_ZERO(arg) (void)(arg)
#endif


/* Prototypes for internal functions */
static int ifoRead_VMG(ifo_handle_t *ifofile);
static int ifoRead_VTS(ifo_handle_t *ifofile);
static int ifoRead_PGC(ifo_handle_t *ifofile, pgc_t *pgc, unsigned int offset);
static int ifoRead_PGC_COMMAND_TBL(ifo_handle_t *ifofile, 
                                   pgc_command_tbl_t *cmd_tbl, 
				   unsigned int offset);
static int ifoRead_PGC_PROGRAM_MAP(ifo_handle_t *ifofile, 
                                   pgc_program_map_t *program_map, 
                                   unsigned int nr, unsigned int offset);
static int ifoRead_CELL_PLAYBACK_TBL(ifo_handle_t *ifofile, 
                                     cell_playback_t *cell_playback, 
                                     unsigned int nr, unsigned int offset);
static int ifoRead_CELL_POSITION_TBL(ifo_handle_t *ifofile, 
                                     cell_position_t *cell_position, 
                                     unsigned int nr, unsigned int offset);
static int ifoRead_VTS_ATTRIBUTES(ifo_handle_t *ifofile, 
                                  vts_attributes_t *vts_attributes, 
                                  unsigned int offset);
static int ifoRead_C_ADT_internal(ifo_handle_t *ifofile, c_adt_t *c_adt, 
                                  unsigned int sector);
static int ifoRead_VOBU_ADMAP_internal(ifo_handle_t *ifofile, 
                                       vobu_admap_t *vobu_admap, 
				       unsigned int sector);
static int ifoRead_PGCIT_internal(ifo_handle_t *ifofile, pgcit_t *pgcit, 
                                  unsigned int offset);

static void ifoFree_PGC(pgc_t *pgc);
static void ifoFree_PGC_COMMAND_TBL(pgc_command_tbl_t *cmd_tbl);
static void ifoFree_PGCIT_internal(pgcit_t *pgcit);


static inline int DVDFileSeek_( dvd_file_t *dvd_file, uint32_t offset ) {
  return (DVDFileSeek(dvd_file, (int)offset) == (int)offset);
}


ifo_handle_t *ifoOpen(dvd_reader_t *dvd, int title) {
  ifo_handle_t *ifofile;

  ifofile = (ifo_handle_t *)malloc(sizeof(ifo_handle_t));
  if(!ifofile)
    return 0;

  memset(ifofile, 0, sizeof(ifo_handle_t));

  ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_FILE);
  if(!ifofile->file) /* Should really catch any error and try to fallback */
    ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_BACKUP_FILE);
  if(!ifofile->file) {
    if(title) {
      fprintf(stderr, "libdvdread: Can't open file VTS_%02d_0.IFO.\n", title);
    } else {
      fprintf(stderr, "libdvdread: Can't open file VIDEO_TS.IFO.\n");
    }
    free(ifofile);
    return 0;
  }

  /* First check if this is a VMGI file. */
  if(ifoRead_VMG(ifofile)) {

    /* These are both mandatory. */
    if(!ifoRead_FP_PGC(ifofile) || !ifoRead_TT_SRPT(ifofile)) {
      fprintf(stderr, "libdvdread: Invalid main menu IFO (VIDEO_TS.IFO).\n");
      ifoClose(ifofile);
      return 0;
    }

    ifoRead_PGCI_UT(ifofile);
    ifoRead_PTL_MAIT(ifofile);

    /* This is also mandatory. */
    if(!ifoRead_VTS_ATRT(ifofile)) {
      fprintf(stderr, "libdvdread: Invalid main menu IFO (VIDEO_TS.IFO).\n");
      ifoClose(ifofile);
      return 0;
    }

    ifoRead_TXTDT_MGI(ifofile);
    ifoRead_C_ADT(ifofile);
    ifoRead_VOBU_ADMAP(ifofile);

    return ifofile;
  }

  if(ifoRead_VTS(ifofile)) {

    if(!ifoRead_VTS_PTT_SRPT(ifofile) || !ifoRead_PGCIT(ifofile)) {
      fprintf(stderr, "libdvdread: Invalid title IFO (VTS_%02d_0.IFO).\n",
              title);
      ifoClose(ifofile);
      return 0;
    }


    ifoRead_PGCI_UT(ifofile);
    ifoRead_VTS_TMAPT(ifofile);
    ifoRead_C_ADT(ifofile);
    ifoRead_VOBU_ADMAP(ifofile);

    if(!ifoRead_TITLE_C_ADT(ifofile) || !ifoRead_TITLE_VOBU_ADMAP(ifofile)) {
      fprintf(stderr, "libdvdread: Invalid title IFO (VTS_%02d_0.IFO).\n",
              title);
      ifoClose(ifofile);
      return 0;
    }

    return ifofile;
  }

  if(title) {
    fprintf(stderr, "libdvdread: Invalid IFO for title %d (VTS_%02d_0.IFO).\n",
	    title, title);
  } else {
    fprintf(stderr, "libdvdread: Invalid IFO for VMGM (VIDEO_TS.IFO).\n");
  }
  ifoClose(ifofile);
  return 0;
}


ifo_handle_t *ifoOpenVMGI(dvd_reader_t *dvd) {
  ifo_handle_t *ifofile;

  ifofile = (ifo_handle_t *)malloc(sizeof(ifo_handle_t));
  if(!ifofile)
    return 0;

  memset(ifofile, 0, sizeof(ifo_handle_t));

  ifofile->file = DVDOpenFile(dvd, 0, DVD_READ_INFO_FILE);
  if(!ifofile->file) /* Should really catch any error and try to fallback */
    ifofile->file = DVDOpenFile(dvd, 0, DVD_READ_INFO_BACKUP_FILE);
  if(!ifofile->file) {
    fprintf(stderr, "libdvdread: Can't open file VIDEO_TS.IFO.\n");
    free(ifofile);
    return 0;
  }

  if(ifoRead_VMG(ifofile))
    return ifofile;

  fprintf(stderr, "libdvdread: Invalid main menu IFO (VIDEO_TS.IFO).\n");
  ifoClose(ifofile);
  return 0;
}


ifo_handle_t *ifoOpenVTSI(dvd_reader_t *dvd, int title) {
  ifo_handle_t *ifofile;
  
  ifofile = (ifo_handle_t *)malloc(sizeof(ifo_handle_t));
  if(!ifofile)
    return 0;

  memset(ifofile, 0, sizeof(ifo_handle_t));
  
  if(title <= 0 || title > 99) {
    fprintf(stderr, "libdvdread: ifoOpenVTSI invalid title (%d).\n", title);
    free(ifofile);
    return 0;
  }
    
  ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_FILE);
  if(!ifofile->file) /* Should really catch any error and try to fallback */
    ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_BACKUP_FILE);
  if(!ifofile->file) {
    fprintf(stderr, "libdvdread: Can't open file VTS_%02d_0.IFO.\n", title);
    free(ifofile);
    return 0;
  }

  ifoRead_VTS(ifofile);
  if(ifofile->vtsi_mat)
    return ifofile;

  fprintf(stderr, "libdvdread: Invalid IFO for title %d (VTS_%02d_0.IFO).\n",
          title, title);
  ifoClose(ifofile);
  return 0;
}


void ifoClose(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  ifoFree_VOBU_ADMAP(ifofile);
  ifoFree_TITLE_VOBU_ADMAP(ifofile);
  ifoFree_C_ADT(ifofile);
  ifoFree_TITLE_C_ADT(ifofile);
  ifoFree_TXTDT_MGI(ifofile);
  ifoFree_VTS_ATRT(ifofile);
  ifoFree_PTL_MAIT(ifofile);
  ifoFree_PGCI_UT(ifofile);
  ifoFree_TT_SRPT(ifofile);
  ifoFree_FP_PGC(ifofile);
  ifoFree_PGCIT(ifofile);
  ifoFree_VTS_PTT_SRPT(ifofile);

  if(ifofile->vmgi_mat)
    free(ifofile->vmgi_mat);

  if(ifofile->vtsi_mat)
    free(ifofile->vtsi_mat);

  DVDCloseFile(ifofile->file);
  ifofile->file = 0;
  free(ifofile);
  ifofile = 0;
}


static int ifoRead_VMG(ifo_handle_t *ifofile) {
  vmgi_mat_t *vmgi_mat;

  vmgi_mat = (vmgi_mat_t *)malloc(sizeof(vmgi_mat_t));
  if(!vmgi_mat)
    return 0;

  ifofile->vmgi_mat = vmgi_mat;

  if(!DVDFileSeek_(ifofile->file, 0)) {
    free(ifofile->vmgi_mat);
    ifofile->vmgi_mat = 0;
    return 0;
  }

  if(!DVDReadBytes(ifofile->file, vmgi_mat, sizeof(vmgi_mat_t))) {
    free(ifofile->vmgi_mat);
    ifofile->vmgi_mat = 0;
    return 0;
  }

  if(strncmp("DVDVIDEO-VMG", vmgi_mat->vmg_identifier, 12) != 0) {
    free(ifofile->vmgi_mat);
    ifofile->vmgi_mat = 0;
    return 0;
  }
  
  B2N_32(vmgi_mat->vmg_last_sector);
  B2N_32(vmgi_mat->vmgi_last_sector);
  B2N_32(vmgi_mat->vmg_category);
  B2N_16(vmgi_mat->vmg_nr_of_volumes);
  B2N_16(vmgi_mat->vmg_this_volume_nr);
  B2N_16(vmgi_mat->vmg_nr_of_title_sets);
  B2N_64(vmgi_mat->vmg_pos_code);
  B2N_32(vmgi_mat->vmgi_last_byte);
  B2N_32(vmgi_mat->first_play_pgc);
  B2N_32(vmgi_mat->vmgm_vobs);
  B2N_32(vmgi_mat->tt_srpt);
  B2N_32(vmgi_mat->vmgm_pgci_ut);
  B2N_32(vmgi_mat->ptl_mait);
  B2N_32(vmgi_mat->vts_atrt);
  B2N_32(vmgi_mat->txtdt_mgi);
  B2N_32(vmgi_mat->vmgm_c_adt);
  B2N_32(vmgi_mat->vmgm_vobu_admap);
  B2N_16(vmgi_mat->vmgm_audio_attr.lang_code);
  B2N_16(vmgi_mat->vmgm_subp_attr.lang_code);


  CHECK_ZERO(vmgi_mat->zero_1);
  CHECK_ZERO(vmgi_mat->zero_2);
  CHECK_ZERO(vmgi_mat->zero_3);
  CHECK_ZERO(vmgi_mat->zero_4);
  CHECK_ZERO(vmgi_mat->zero_5);
  CHECK_ZERO(vmgi_mat->zero_6);
  CHECK_ZERO(vmgi_mat->zero_7);
  CHECK_ZERO(vmgi_mat->zero_8);
  CHECK_ZERO(vmgi_mat->zero_9);
  CHECK_ZERO(vmgi_mat->zero_10);  
  CHECK_VALUE(vmgi_mat->vmg_last_sector != 0);
  CHECK_VALUE(vmgi_mat->vmgi_last_sector != 0);
  CHECK_VALUE(vmgi_mat->vmgi_last_sector * 2 <= vmgi_mat->vmg_last_sector);
  CHECK_VALUE(vmgi_mat->vmgi_last_sector * 2 <= vmgi_mat->vmg_last_sector);
  CHECK_VALUE(vmgi_mat->vmg_nr_of_volumes != 0);
  CHECK_VALUE(vmgi_mat->vmg_this_volume_nr != 0);
  CHECK_VALUE(vmgi_mat->vmg_this_volume_nr <= vmgi_mat->vmg_nr_of_volumes);
  CHECK_VALUE(vmgi_mat->disc_side == 1 || vmgi_mat->disc_side == 2);
  CHECK_VALUE(vmgi_mat->vmg_nr_of_title_sets != 0);
  CHECK_VALUE(vmgi_mat->vmgi_last_byte >= 341);
  CHECK_VALUE(vmgi_mat->vmgi_last_byte / DVD_BLOCK_LEN <= 
         vmgi_mat->vmgi_last_sector);
  /* It seems that first_play_pgc is optional. */
  CHECK_VALUE(vmgi_mat->first_play_pgc < vmgi_mat->vmgi_last_byte);
  CHECK_VALUE(vmgi_mat->vmgm_vobs == 0 || 
        (vmgi_mat->vmgm_vobs > vmgi_mat->vmgi_last_sector &&
         vmgi_mat->vmgm_vobs < vmgi_mat->vmg_last_sector));
  CHECK_VALUE(vmgi_mat->tt_srpt <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vmgm_pgci_ut <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->ptl_mait <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vts_atrt <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->txtdt_mgi <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vmgm_c_adt <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vmgm_vobu_admap <= vmgi_mat->vmgi_last_sector);

  CHECK_VALUE(vmgi_mat->nr_of_vmgm_audio_streams <= 1);
  CHECK_VALUE(vmgi_mat->nr_of_vmgm_subp_streams <= 1);

  return 1;
}


static int ifoRead_VTS(ifo_handle_t *ifofile) {
  vtsi_mat_t *vtsi_mat;
  int i;

  vtsi_mat = (vtsi_mat_t *)malloc(sizeof(vtsi_mat_t));
  if(!vtsi_mat)
    return 0;
  
  ifofile->vtsi_mat = vtsi_mat;

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

  if(!(DVDReadBytes(ifofile->file, vtsi_mat, sizeof(vtsi_mat_t)))) {
    free(ifofile->vtsi_mat);
    ifofile->vtsi_mat = 0;
    return 0;
  }

  if(strncmp("DVDVIDEO-VTS", vtsi_mat->vts_identifier, 12) != 0) {
    free(ifofile->vtsi_mat);
    ifofile->vtsi_mat = 0;
    return 0;
  }

  B2N_32(vtsi_mat->vts_last_sector);
  B2N_32(vtsi_mat->vtsi_last_sector);
  B2N_32(vtsi_mat->vts_category);
  B2N_32(vtsi_mat->vtsi_last_byte);
  B2N_32(vtsi_mat->vtsm_vobs);
  B2N_32(vtsi_mat->vtstt_vobs);
  B2N_32(vtsi_mat->vts_ptt_srpt);
  B2N_32(vtsi_mat->vts_pgcit);
  B2N_32(vtsi_mat->vtsm_pgci_ut);
  B2N_32(vtsi_mat->vts_tmapt);
  B2N_32(vtsi_mat->vtsm_c_adt);
  B2N_32(vtsi_mat->vtsm_vobu_admap);
  B2N_32(vtsi_mat->vts_c_adt);
  B2N_32(vtsi_mat->vts_vobu_admap);
  B2N_16(vtsi_mat->vtsm_audio_attr.lang_code);
  B2N_16(vtsi_mat->vtsm_subp_attr.lang_code);
  for(i = 0; i < 8; i++)
    B2N_16(vtsi_mat->vts_audio_attr[i].lang_code);
  for(i = 0; i < 32; i++)
    B2N_16(vtsi_mat->vts_subp_attr[i].lang_code);


  CHECK_ZERO(vtsi_mat->zero_1);
  CHECK_ZERO(vtsi_mat->zero_2);
  CHECK_ZERO(vtsi_mat->zero_3);
  CHECK_ZERO(vtsi_mat->zero_4);
  CHECK_ZERO(vtsi_mat->zero_5);
  CHECK_ZERO(vtsi_mat->zero_6);
  CHECK_ZERO(vtsi_mat->zero_7);
  CHECK_ZERO(vtsi_mat->zero_8);
  CHECK_ZERO(vtsi_mat->zero_9);
  CHECK_ZERO(vtsi_mat->zero_10);
  CHECK_ZERO(vtsi_mat->zero_11);
  CHECK_ZERO(vtsi_mat->zero_12);
  CHECK_ZERO(vtsi_mat->zero_13);
  CHECK_ZERO(vtsi_mat->zero_14);
  CHECK_ZERO(vtsi_mat->zero_15);
  CHECK_ZERO(vtsi_mat->zero_16);
  CHECK_ZERO(vtsi_mat->zero_17);
  CHECK_ZERO(vtsi_mat->zero_18);
  CHECK_ZERO(vtsi_mat->zero_19);
  CHECK_ZERO(vtsi_mat->zero_20);
  CHECK_ZERO(vtsi_mat->zero_21);
  CHECK_VALUE(vtsi_mat->vtsi_last_sector*2 <= vtsi_mat->vts_last_sector);
  CHECK_VALUE(vtsi_mat->vtsi_last_byte/DVD_BLOCK_LEN <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vtsm_vobs == 0 || 
       (vtsi_mat->vtsm_vobs > vtsi_mat->vtsi_last_sector &&
         vtsi_mat->vtsm_vobs < vtsi_mat->vts_last_sector));
  CHECK_VALUE(vtsi_mat->vtstt_vobs == 0 || 
        (vtsi_mat->vtstt_vobs > vtsi_mat->vtsi_last_sector &&
         vtsi_mat->vtstt_vobs < vtsi_mat->vts_last_sector));
  CHECK_VALUE(vtsi_mat->vts_ptt_srpt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_pgcit <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vtsm_pgci_ut <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_tmapt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vtsm_c_adt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vtsm_vobu_admap <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_c_adt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_vobu_admap <= vtsi_mat->vtsi_last_sector);
  
  CHECK_VALUE(vtsi_mat->nr_of_vtsm_audio_streams <= 1);
  CHECK_VALUE(vtsi_mat->nr_of_vtsm_subp_streams <= 1);

  CHECK_VALUE(vtsi_mat->nr_of_vts_audio_streams <= 8);
  for(i = vtsi_mat->nr_of_vts_audio_streams; i < 8; i++)
    CHECK_ZERO(vtsi_mat->vts_audio_attr[i]);

  CHECK_VALUE(vtsi_mat->nr_of_vts_subp_streams <= 32);
  for(i = vtsi_mat->nr_of_vts_subp_streams; i < 32; i++)
    CHECK_ZERO(vtsi_mat->vts_subp_attr[i]);      
  
  for(i = 0; i < 8; i++) {
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero1);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero2);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero3);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero4);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero5);
    CHECK_ZERO(vtsi_mat->vts_mu_audio_attr[i].zero6);
  }
  
  return 1;
}


static int ifoRead_PGC_COMMAND_TBL(ifo_handle_t *ifofile, 
                                   pgc_command_tbl_t *cmd_tbl, 
				   unsigned int offset) {
  
  memset(cmd_tbl, 0, sizeof(pgc_command_tbl_t));
  
  if(!DVDFileSeek_(ifofile->file, offset))
    return 0;

  if(!(DVDReadBytes(ifofile->file, cmd_tbl, PGC_COMMAND_TBL_SIZE)))
    return 0;

  B2N_16(cmd_tbl->nr_of_pre);
  B2N_16(cmd_tbl->nr_of_post);
  B2N_16(cmd_tbl->nr_of_cell);

  CHECK_VALUE(cmd_tbl->nr_of_pre + cmd_tbl->nr_of_post + cmd_tbl->nr_of_cell<= 255);
     
  if(cmd_tbl->nr_of_pre != 0) {
    unsigned int pre_cmds_size  = cmd_tbl->nr_of_pre * COMMAND_DATA_SIZE;
    cmd_tbl->pre_cmds = (vm_cmd_t *)malloc(pre_cmds_size);
    if(!cmd_tbl->pre_cmds)
      return 0;

    if(!(DVDReadBytes(ifofile->file, cmd_tbl->pre_cmds, pre_cmds_size))) {
      free(cmd_tbl->pre_cmds);
      return 0;
    }
  }
  
  if(cmd_tbl->nr_of_post != 0) {