libmpdemux/ebml.h

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef MPLAYER_EBML_H
  20 #define MPLAYER_EBML_H
  21
  22 #include <inttypes.h>
  23 #include <stddef.h>
  24 #include <stdbool.h>
  25
  26 #include "stream/stream.h"
  27
  28
  29 /* EBML version supported */
  30 #define EBML_VERSION 1
  31
  32 enum ebml_elemtype {
  33     EBML_TYPE_SUBELEMENTS,
  34     EBML_TYPE_UINT,
  35     EBML_TYPE_SINT,
  36     EBML_TYPE_FLOAT,
  37     EBML_TYPE_STR,
  38     EBML_TYPE_BINARY,
  39     EBML_TYPE_EBML_ID,
  40 };
  41
  42 struct ebml_field_desc {
  43     uint32_t id;
  44     bool multiple;
  45     int offset;
  46     int count_offset;
  47     const struct ebml_elem_desc *desc;
  48 };
  49
  50 struct ebml_elem_desc {
  51     char *name;
  52     enum ebml_elemtype type;
  53     int size;
  54     int field_count;
  55     const struct ebml_field_desc *fields;
  56 };
  57
  58 struct ebml_parse_ctx {
  59     void *talloc_ctx;
  60     int bytes_read;
  61     bool has_errors;
  62     bool no_error_messages;
  63 };
  64
  65 struct bstr {
  66     uint8_t *start;
  67     int len;
  68 };
  69
  70 #include "ebml_types.h"
  71
  72 #define EBML_ID_INVALID 0xffffffff
  73
  74
  75 /* matroska track types */
  76 #define MATROSKA_TRACK_VIDEO    0x01 /* rectangle-shaped pictures aka video */
  77 #define MATROSKA_TRACK_AUDIO    0x02 /* anything you can hear */
  78 #define MATROSKA_TRACK_COMPLEX  0x03 /* audio+video in same track used by DV */
  79 #define MATROSKA_TRACK_LOGO     0x10 /* overlay-pictures displayed over video*/
  80 #define MATROSKA_TRACK_SUBTITLE 0x11 /* text-subtitles */
  81 #define MATROSKA_TRACK_CONTROL  0x20 /* control-codes for menu or other stuff*/
  82
  83 /* matroska subtitle types */
  84 #define MATROSKA_SUBTYPE_UNKNOWN   0
  85 #define MATROSKA_SUBTYPE_TEXT      1
  86 #define MATROSKA_SUBTYPE_SSA       2
  87 #define MATROSKA_SUBTYPE_VOBSUB    3
  88
  89 #ifndef UINT64_MAX
  90 #define UINT64_MAX 18446744073709551615ULL
  91 #endif
  92
  93 #ifndef INT64_MAX
  94 #define INT64_MAX 9223372036854775807LL
  95 #endif
  96
  97 #define EBML_UINT_INVALID   UINT64_MAX
  98 #define EBML_INT_INVALID    INT64_MAX
  99 #define EBML_FLOAT_INVALID  -1000000000.0
 100
 101
 102 uint32_t ebml_read_id (stream_t *s, int *length);
 103 uint64_t ebml_read_vlen_uint (uint8_t *buffer, int *length);
 104 int64_t ebml_read_vlen_int (uint8_t *buffer, int *length);
 105 uint64_t ebml_read_length (stream_t *s, int *length);
 106 uint64_t ebml_read_uint (stream_t *s, uint64_t *length);
 107 int64_t ebml_read_int (stream_t *s, uint64_t *length);
 108 double ebml_read_float (stream_t *s, uint64_t *length);
 109 char *ebml_read_ascii (stream_t *s, uint64_t *length);
 110 char *ebml_read_utf8 (stream_t *s, uint64_t *length);
 111 int ebml_read_skip (stream_t *s, uint64_t *length);
 112 uint32_t ebml_read_master (stream_t *s, uint64_t *length);
 113
 114 int ebml_read_element(struct stream *s, struct ebml_parse_ctx *ctx,
 115                       void *target, const struct ebml_elem_desc *desc);
 116
 117 #endif /* MPLAYER_EBML_H */