ifo_types.h

有关mpeg2的deocde代码

#ifndef IFO_TYPES_H_INCLUDED
#define IFO_TYPES_H_INCLUDED

/*
 * Copyright (C) 2000, 2001 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 <inttypes.h>
#include <dvdread/dvd_reader.h>


#undef ATTRIBUTE_PACKED
#undef PRAGMA_PACK_BEGIN 
#undef PRAGMA_PACK_END

#if defined(__GNUC__)
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
#define ATTRIBUTE_PACKED __attribute__ ((packed))
#define PRAGMA_PACK 0
#endif
#endif

#if !defined(ATTRIBUTE_PACKED)
#define ATTRIBUTE_PACKED
#define PRAGMA_PACK 1
#endif

#if PRAGMA_PACK
#pragma pack(1)
#endif


/**
 * Common
 *
 * The following structures are used in both the VMGI and VTSI.
 */


/**
 * DVD Time Information.
 */
typedef struct {
  uint8_t hour;
  uint8_t minute;
  uint8_t second;
  uint8_t frame_u; /* The two high bits are the frame rate. */
} ATTRIBUTE_PACKED dvd_time_t;

/**
 * Type to store per-command data.
 */
typedef struct {
  uint8_t bytes[8];
} ATTRIBUTE_PACKED vm_cmd_t;
#define COMMAND_DATA_SIZE 8


/**
 * Video Attributes.
 */
typedef struct {
#ifdef WORDS_BIGENDIAN
  unsigned int mpeg_version         : 2;
  unsigned int video_format         : 2;
  unsigned int display_aspect_ratio : 2;
  unsigned int permitted_df         : 2;
  
  unsigned int line21_cc_1          : 1;
  unsigned int line21_cc_2          : 1;
  unsigned int unknown1             : 1;
  unsigned int bit_rate             : 1;
  
  unsigned int picture_size         : 2;
  unsigned int letterboxed          : 1;
  unsigned int film_mode            : 1;
#else
  unsigned int permitted_df         : 2;
  unsigned int display_aspect_ratio : 2;
  unsigned int video_format         : 2;
  unsigned int mpeg_version         : 2;
  
  unsigned int film_mode            : 1;
  unsigned int letterboxed          : 1;
  unsigned int picture_size         : 2;
  
  unsigned int bit_rate             : 1;
  unsigned int unknown1             : 1;
  unsigned int line21_cc_2          : 1;
  unsigned int line21_cc_1          : 1;
#endif
} ATTRIBUTE_PACKED video_attr_t;

/**
 * Audio Attributes.
 */
typedef struct {
#ifdef WORDS_BIGENDIAN
  unsigned int audio_format           : 3;
  unsigned int multichannel_extension : 1;
  unsigned int lang_type              : 2;
  unsigned int application_mode       : 2;
  
  unsigned int quantization           : 2;
  unsigned int sample_frequency       : 2;
  unsigned int unknown1               : 1;
  unsigned int channels               : 3;
#else
  unsigned int application_mode       : 2;
  unsigned int lang_type              : 2;
  unsigned int multichannel_extension : 1;
  unsigned int audio_format           : 3;
  
  unsigned int channels               : 3;
  unsigned int unknown1               : 1;
  unsigned int sample_frequency       : 2;
  unsigned int quantization           : 2;
#endif
  uint16_t lang_code;
  uint8_t  lang_extension;
  uint8_t  code_extension;
  uint8_t unknown3;
  union {
    struct ATTRIBUTE_PACKED {
#ifdef WORDS_BIGENDIAN
      unsigned int unknown4           : 1;
      unsigned int channel_assignment : 3;
      unsigned int version            : 2;
      unsigned int mc_intro           : 1; /* probably 0: true, 1:false */
      unsigned int mode               : 1; /* Karaoke mode 0: solo 1: duet */
#else
      unsigned int mode               : 1;
      unsigned int mc_intro           : 1;
      unsigned int version            : 2;
      unsigned int channel_assignment : 3;
      unsigned int unknown4           : 1;
#endif
    } karaoke;
    struct ATTRIBUTE_PACKED {
#ifdef WORDS_BIGENDIAN
      unsigned int unknown5           : 4;
      unsigned int dolby_encoded      : 1; /* suitable for surround decoding */
      unsigned int unknown6           : 3;
#else
      unsigned int unknown6           : 3;
      unsigned int dolby_encoded      : 1;
      unsigned int unknown5           : 4;
#endif
    } surround;
  } app_info;
} ATTRIBUTE_PACKED audio_attr_t;


/**
 * MultiChannel Extension
 */
typedef struct {
#ifdef WORDS_BIGENDIAN
  unsigned int zero1      : 7;
  unsigned int ach0_gme   : 1;

  unsigned int zero2      : 7;
  unsigned int ach1_gme   : 1;

  unsigned int zero3      : 4;
  unsigned int ach2_gv1e  : 1;
  unsigned int ach2_gv2e  : 1;
  unsigned int ach2_gm1e  : 1;
  unsigned int ach2_gm2e  : 1;

  unsigned int zero4      : 4;
  unsigned int ach3_gv1e  : 1;
  unsigned int ach3_gv2e  : 1;
  unsigned int ach3_gmAe  : 1;
  unsigned int ach3_se2e  : 1;

  unsigned int zero5      : 4;
  unsigned int ach4_gv1e  : 1;
  unsigned int ach4_gv2e  : 1;
  unsigned int ach4_gmBe  : 1;
  unsigned int ach4_seBe  : 1;
#else
  unsigned int ach0_gme   : 1;
  unsigned int zero1      : 7;

  unsigned int ach1_gme   : 1;
  unsigned int zero2      : 7;

  unsigned int ach2_gm2e  : 1;
  unsigned int ach2_gm1e  : 1;
  unsigned int ach2_gv2e  : 1;
  unsigned int ach2_gv1e  : 1;
  unsigned int zero3      : 4;

  unsigned int ach3_se2e  : 1;
  unsigned int ach3_gmAe  : 1;
  unsigned int ach3_gv2e  : 1;
  unsigned int ach3_gv1e  : 1;
  unsigned int zero4      : 4;

  unsigned int ach4_seBe  : 1;
  unsigned int ach4_gmBe  : 1;
  unsigned int ach4_gv2e  : 1;
  unsigned int ach4_gv1e  : 1;
  unsigned int zero5      : 4;
#endif
  uint8_t zero6[19];
} ATTRIBUTE_PACKED multichannel_ext_t;


/**
 * Subpicture Attributes.
 */
typedef struct {
  /*
   * type: 0 not specified
   *       1 language
   *       2 other
   * coding mode: 0 run length
   *              1 extended
   *              2 other
   * language: indicates language if type == 1
   * lang extension: if type == 1 contains the lang extension
   */
#ifdef WORDS_BIGENDIAN
  unsigned int code_mode : 3;
  unsigned int zero1     : 3;
  unsigned int type      : 2;
#else
  unsigned int type      : 2;
  unsigned int zero1     : 3;
  unsigned int code_mode : 3;
#endif
  uint8_t  zero2;
  uint16_t lang_code;
  uint8_t  lang_extension;
  uint8_t  code_extension;
} ATTRIBUTE_PACKED subp_attr_t;



/**
 * PGC Command Table.
 */ 
typedef struct {
  uint16_t nr_of_pre;
  uint16_t nr_of_post;
  uint16_t nr_of_cell;
  uint16_t zero_1;
  vm_cmd_t *pre_cmds;
  vm_cmd_t *post_cmds;
  vm_cmd_t *cell_cmds;
} ATTRIBUTE_PACKED pgc_command_tbl_t;
#define PGC_COMMAND_TBL_SIZE 8

/**
 * PGC Program Map
 */
typedef uint8_t pgc_program_map_t; 

/**
 * Cell Playback Information.
 */
typedef struct {
#ifdef WORDS_BIGENDIAN
  unsigned int block_mode       : 2;
  unsigned int block_type       : 2;
  unsigned int seamless_play    : 1;
  unsigned int interleaved      : 1;
  unsigned int stc_discontinuity: 1;
  unsigned int seamless_angle   : 1;
  
  unsigned int playback_mode    : 1;  /**< When set, enter StillMode after each VOBU */
  unsigned int restricted       : 1;  /**< ?? drop out of fastforward? */
  unsigned int unknown2         : 6;
#else
  unsigned int seamless_angle   : 1;
  unsigned int stc_discontinuity: 1;
  unsigned int interleaved      : 1;
  unsigned int seamless_play    : 1;
  unsigned int block_type       : 2;
  unsigned int block_mode       : 2;
  
  unsigned int unknown2         : 6;
  unsigned int restricted       : 1;
  unsigned int playback_mode    : 1;
#endif
  uint8_t still_time;
  uint8_t cell_cmd_nr;
  dvd_time_t playback_time;
  uint32_t first_sector;
  uint32_t first_ilvu_end_sector;
  uint32_t last_vobu_start_sector;
  uint32_t last_sector;
} ATTRIBUTE_PACKED cell_playback_t;

#define BLOCK_TYPE_NONE         0x0
#define BLOCK_TYPE_ANGLE_BLOCK  0x1

#define BLOCK_MODE_NOT_IN_BLOCK 0x0
#define BLOCK_MODE_FIRST_CELL   0x1
#define BLOCK_MODE_IN_BLOCK     0x2
#define BLOCK_MODE_LAST_CELL    0x3

/**
 * Cell Position Information.
 */
typedef struct {
  uint16_t vob_id_nr;
  uint8_t  zero_1;
  uint8_t  cell_nr;
} ATTRIBUTE_PACKED cell_position_t;

/**
 * User Operations.
 */
typedef struct {
#ifdef WORDS_BIGENDIAN
  unsigned int zero                           : 7; /* 25-31 */
  unsigned int video_pres_mode_change         : 1; /* 24 */
  
  unsigned int karaoke_audio_pres_mode_change : 1; /* 23 */
  unsigned int angle_change                   : 1;
  unsigned int subpic_stream_change           : 1;
  unsigned int audio_stream_change            : 1;
  unsigned int pause_on                       : 1;
  unsigned int still_off                      : 1;
  unsigned int button_select_or_activate      : 1;
  unsigned int resume                         : 1; /* 16 */
  
  unsigned int chapter_menu_call              : 1; /* 15 */
  unsigned int angle_menu_call                : 1;
  unsigned int audio_menu_call                : 1;
  unsigned int subpic_menu_call               : 1;
  unsigned int root_menu_call                 : 1;
  unsigned int title_menu_call                : 1;
  unsigned int backward_scan                  : 1;
  unsigned int forward_scan                   : 1; /* 8 */
  
  unsigned int next_pg_search                 : 1; /* 7 */
  unsigned int prev_or_top_pg_search          : 1;
  unsigned int time_or_chapter_search         : 1;
  unsigned int go_up                          : 1;
  unsigned int stop                           : 1;
  unsigned int title_play                     : 1;
  unsigned int chapter_search_or_play         : 1;
  unsigned int title_or_time_play             : 1; /* 0 */
#else
  unsigned int video_pres_mode_change         : 1; /* 24 */
  unsigned int zero                           : 7; /* 25-31 */
  
  unsigned int resume                         : 1; /* 16 */
  unsigned int button_select_or_activate      : 1;
  unsigned int still_off                      : 1;
  unsigned int pause_on                       : 1;
  unsigned int audio_stream_change            : 1;
  unsigned int subpic_stream_change           : 1;
  unsigned int angle_change                   : 1;
  unsigned int karaoke_audio_pres_mode_change : 1; /* 23 */
  
  unsigned int forward_scan                   : 1; /* 8 */
  unsigned int backward_scan                  : 1;
  unsigned int title_menu_call                : 1;
  unsigned int root_menu_call                 : 1;
  unsigned int subpic_menu_call               : 1;
  unsigned int audio_menu_call                : 1;
  unsigned int angle_menu_call                : 1;
  unsigned int chapter_menu_call              : 1; /* 15 */
  
  unsigned int title_or_time_play             : 1; /* 0 */
  unsigned int chapter_search_or_play         : 1;
  unsigned int title_play                     : 1;
  unsigned int stop                           : 1;
  unsigned int go_up                          : 1;
  unsigned int time_or_chapter_search         : 1;
  unsigned int prev_or_top_pg_search          : 1;
  unsigned int next_pg_search                 : 1; /* 7 */
#endif
} ATTRIBUTE_PACKED user_ops_t;

/**
 * Program Chain Information.
 */
typedef struct {
  uint16_t zero_1;
  uint8_t  nr_of_programs;
  uint8_t  nr_of_cells;
  dvd_time_t playback_time;
  user_ops_t prohibited_ops;
  uint16_t audio_control[8]; /* New type? */
  uint32_t subp_control[32]; /* New type? */
  uint16_t next_pgc_nr;
  uint16_t prev_pgc_nr;
  uint16_t goup_pgc_nr;
  uint8_t  still_time;
  uint8_t  pg_playback_mode;
  uint32_t palette[16]; /* New type struct {zero_1, Y, Cr, Cb} ? */
  uint16_t command_tbl_offset;
  uint16_t program_map_offset;
  uint16_t cell_playback_offset;
  uint16_t cell_position_offset;
  pgc_command_tbl_t *command_tbl;
  pgc_program_map_t  *program_map;
  cell_playback_t *cell_playback;
  cell_position_t *cell_position;
} ATTRIBUTE_PACKED pgc_t;
#define PGC_SIZE 236

/**
 * Program Chain Information Search Pointer.
 */
typedef struct {
  uint8_t  entry_id;
#ifdef WORDS_BIGENDIAN
  unsigned int block_mode : 2;
  unsigned int block_type : 2;
  unsigned int unknown1   : 4;
#else
  unsigned int unknown1   : 4;
  unsigned int block_type : 2;
  unsigned int block_mode : 2;
#endif  
  uint16_t ptl_id_mask;
  uint32_t pgc_start_byte;
  pgc_t *pgc;
} ATTRIBUTE_PACKED pgci_srp_t;
#define PGCI_SRP_SIZE 8