core/box_default.c

   1 /*****************************************************************************
   2  * box_default.c
   3  *****************************************************************************
   4  * Copyright (C) 2017 L-SMASH project
   5  *
   6  * Authors: Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>
   7  *
   8  * Permission to use, copy, modify, and/or distribute this software for any
   9  * purpose with or without fee is hereby granted, provided that the above
  10  * copyright notice and this permission notice appear in all copies.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19  *****************************************************************************/
  20
  21 /* This file is available under an ISC license. */
  22
  23 #include "common/internal.h" /* must be placed first */
  24
  25 #include "box.h"
  26 #include "box_default.h"
  27
  28 #define INITIALIZE_BASEBOX_COMMON( box_name )                                \
  29     .class        = &isom_box_default_class,                                 \
  30     .root         = (isom_root_abstract_t *)&isom_root_abstract_box_default, \
  31     .file         = (isom_file_abstract_t *)&isom_file_abstract_box_default, \
  32     .parent       = (isom_box_t *)&isom_opaque_box_default,                  \
  33     .nonexist_ptr = (void *)&isom_##box_name##_box_default,                  \
  34     .binary       = NULL,                                                    \
  35     .destruct     = NULL,                                                    \
  36     .write        = NULL,                                                    \
  37     .manager      = LSMASH_NON_EXISTING_BOX,                                 \
  38     .precedence   = 0,                                                       \
  39     .pos          = 0,                                                       \
  40     .extensions   = { .head = NULL },                                        \
  41     .size         = 0,                                                       \
  42     .type         = LSMASH_BOX_TYPE_INITIALIZER
  43
  44 #define DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( box_name )        \
  45     const isom_##box_name##_t isom_##box_name##_box_default = \
  46     {                                                         \
  47         INITIALIZE_BASEBOX_COMMON( box_name )                 \
  48     }
  49
  50 static const lsmash_class_t isom_box_default_class =
  51 {
  52     "box_default"
  53 };
  54
  55 typedef isom_box_t isom_opaque_t;
  56 static const isom_box_t isom_opaque_box_default =
  57 {
  58     INITIALIZE_BASEBOX_COMMON( opaque )
  59 };
  60
  61 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( dummy );
  62 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( unknown );
  63 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( ftyp );
  64 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( ctab );
  65 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( tkhd );
  66 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( clef );
  67 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( prof );
  68 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( enof );
  69 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( elst );
  70 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( tref_type );
  71 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( tref );
  72 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mdhd );
  73 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( hdlr );
  74 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( vmhd );
  75 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( smhd );
  76 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( hmhd );
  77 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( nmhd );
  78 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( gmin );
  79 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( text );
  80 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( dref_entry );
  81 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( dref );
  82 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( esds );
  83 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( btrt );
  84 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( glbl );
  85 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( clap );
  86 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( pasp );
  87 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( colr );
  88 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( gama );
  89 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( fiel );
  90 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( cspc );
  91 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( sgbt );
  92 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stsl );
  93 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( sample_entry );
  94 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mp4s_entry );
  95 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( visual_entry );
  96 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( frma );
  97 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( enda );
  98 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mp4a );
  99 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( terminator );
 100 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( chan );
 101 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( srat );
 102 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( audio_entry );
 103 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( hint_entry );
 104 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( metadata_entry );
 105 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( qt_text_entry );
 106 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( ftab );
 107 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stsd );
 108 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stts );
 109 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( ctts );
 110 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( cslg );
 111 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stsz );
 112 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stz2 );
 113 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stss );
 114 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stps );
 115 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( sdtp );
 116 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stsc );
 117 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( stco );
 118 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( sgpd );
 119 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( sbgp );
 120 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mvhd );
 121 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( iods );
 122 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mdat );
 123 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( skip );
 124 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( chpl );
 125 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( keys );
 126 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mean );
 127 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( name );
 128 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( data );
 129 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( ilst );
 130 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( WLOC );
 131 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( LOOP );
 132 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( SelO );
 133 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( AllF );
 134 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( cprt );
 135 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mehd );
 136 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( trex );
 137 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mfhd );
 138 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( tfhd );
 139 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( tfdt );
 140 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( trun );
 141 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( tfra );
 142 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( mfro );
 143 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( styp );
 144 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( sidx );
 145 DEFINE_SIMPLE_BOX_DEFAULT_CONSTANT( root_abstract );
 146
 147 #define INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( child_name ) \
 148     .child_name = (isom_##child_name##_t *)&isom_##child_name##_box_default
 149
 150 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( ... ) \
 151         CALL_FUNC_DEFAULT_ARGS( DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT, __VA_ARGS__ )
 152 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name, expanded_initializations ) \
 153     const isom_##box_name##_t isom_##box_name##_box_default =                                       \
 154     {                                                                                               \
 155         INITIALIZE_BASEBOX_COMMON( box_name ),                                                      \
 156         expanded_initializations                                                                    \
 157     }
 158 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_12( box_name,                                     \
 159                                                          _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10 ) \
 160     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,                                   \
 161         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ),                     \
 162                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ),                     \
 163                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _2 ),                     \
 164                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _3 ),                     \
 165                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _4 ),                     \
 166                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _5 ),                     \
 167                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _6 ),                     \
 168                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _7 ),                     \
 169                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _8 ),                     \
 170                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _9 ),                     \
 171                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _10 ) ) )
 172 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_9( box_name, _0, _1, _2, _3, _4, _5, _6, _7 ) \
 173     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,                               \
 174         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ),                 \
 175                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ),                 \
 176                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _2 ),                 \
 177                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _3 ),                 \
 178                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _4 ),                 \
 179                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _5 ),                 \
 180                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _6 ),                 \
 181                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _7 ) ) )
 182 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_8( box_name, _0, _1, _2, _3, _4, _5, _6 ) \
 183     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,                           \
 184         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ),             \
 185                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ),             \
 186                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _2 ),             \
 187                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _3 ),             \
 188                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _4 ),             \
 189                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _5 ),             \
 190                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _6 ) ) )
 191 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_7( box_name, _0, _1, _2, _3, _4, _5 ) \
 192     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,                       \
 193         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ),         \
 194                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ),         \
 195                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _2 ),         \
 196                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _3 ),         \
 197                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _4 ),         \
 198                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _5 ) ) )
 199 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_6( box_name, _0, _1, _2, _3, _4 ) \
 200     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,                   \
 201         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ),     \
 202                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ),     \
 203                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _2 ),     \
 204                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _3 ),     \
 205                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _4 ) ) )
 206 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_5( box_name, _0, _1, _2, _3 ) \
 207     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,               \
 208         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ), \
 209                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ), \
 210                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _2 ), \
 211                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _3 ) ) )
 212 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_4( box_name, _0, _1, _2 )     \
 213     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,               \
 214         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ), \
 215                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ), \
 216                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _2 ) ) )
 217 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_3( box_name, _0, _1 )         \
 218     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,               \
 219         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ), \
 220                         INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _1 ) ) )
 221 #define DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_2( box_name, _0 ) \
 222     DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT_TEMPLATE( box_name,   \
 223         EXPAND_VA_ARGS( INITIALIZE_PREDEFINED_CHILD_BY_DEFAULT_CONSTANT_PTR( _0 ) ) )
 224
 225 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( tapt, clef, enof, prof );
 226 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( edts, elst );
 227 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( gmhd, gmin, text );
 228 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( dinf, dref );
 229 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( wave, frma, enda, mp4a );
 230 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( tx3g_entry, ftab );
 231 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( stbl, stsd, stts, ctts, cslg, stss, stps, sdtp, stsc, stsz, stz2, stco );
 232 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( minf, vmhd, smhd, hmhd, nmhd, gmhd, hdlr, dinf, stbl );
 233 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( mdia, mdhd, hdlr, minf );
 234 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( metaitem, mean, name, data );
 235 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( meta, hdlr, dinf, keys, ilst );
 236 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( udta, chpl, meta, WLOC, LOOP, SelO, AllF );
 237 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( mvex, mehd );
 238 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( traf, tfhd, tfdt, sdtp );
 239 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( moof, mfhd );
 240 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( mfra, mfro );
 241 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( trak, tkhd, tapt, edts, tref, mdia, udta, meta );
 242 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( moov, mvhd, iods, udta, ctab, meta, mvex );
 243 DEFINE_SIMPLE_CONTAINER_BOX_DEFAULT_CONSTANT( file_abstract, ftyp, moov, mdat, meta, mfra );
 244
 245 /* Box-lists predefined in the parent box definitions are initialized by 0s, thus the entry eliminator
 246  * of each list also be set to NULL (0). This must not be an issue since all box are deallocated through
 247  * the 'extensions' list of the parent box. Only 'entry' which holds the actual box data is deallocated
 248  * when the box is deallocated by the isom_remove_box_in_predefined_list() function. Because of that,
 249  * here, there are no explicit default constant definitions of indivisual predefined box-lists. */
 250
 251
 252 /* Allocate box by default settings.
 253  *
 254  * Use this function to allocate boxes as much as possible, it covers forgetful settings. */
 255 void *allocate_box_by_default
 256 (
 257     const void  *nonexist_ptr,
 258     const size_t data_type_size
 259 )
 260 {
 261     assert( data_type_size >= offsetof( isom_box_t, manager ) + sizeof(((isom_box_t *)0)->manager) );
 262     isom_box_t *box = (isom_box_t *)lsmash_memdup( nonexist_ptr, data_type_size );
 263     if( !box )
 264         return (void *)nonexist_ptr;
 265     box->manager &= ~LSMASH_NON_EXISTING_BOX;
 266     lsmash_list_init( &box->extensions, isom_remove_extension_box );
 267     return (void *)box;
 268 }