include/vlc_plugin.h

   1 /*****************************************************************************
   2  * vlc_plugin.h : Macros used from within a module.
   3  *****************************************************************************
   4  * Copyright (C) 2001-2006 the VideoLAN team
   5  * Copyright © 2007-2009 Rémi Denis-Courmont
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifndef LIBVLC_MODULES_MACROS_H
  25 # define LIBVLC_MODULES_MACROS_H 1
  26
  27 /**
  28  * \file
  29  * This file implements plugin (module) macros used to define a vlc module.
  30  */
  31
  32 VLC_EXPORT( int, vlc_plugin_set, (module_t *, module_config_t *, int, ...) );
  33
  34 #define vlc_module_set( mod, ... ) vlc_plugin_set ((mod), NULL, __VA_ARGS__)
  35 #define vlc_config_set( cfg, ... ) vlc_plugin_set (NULL, (cfg), __VA_ARGS__)
  36
  37 enum vlc_module_properties
  38 {
  39     VLC_SUBMODULE_CREATE,
  40     VLC_CONFIG_CREATE,
  41
  42     /* DO NOT EVER REMOVE, INSERT OR REPLACE ANY ITEM! It would break the ABI!
  43      * Append new items at the end ONLY. */
  44     VLC_MODULE_CPU_REQUIREMENT=0x100,
  45     VLC_MODULE_SHORTCUT,
  46     VLC_MODULE_CAPABILITY,
  47     VLC_MODULE_SCORE,
  48     VLC_MODULE_CB_OPEN,
  49     VLC_MODULE_CB_CLOSE,
  50     VLC_MODULE_NO_UNLOAD,
  51     VLC_MODULE_NAME,
  52     VLC_MODULE_SHORTNAME,
  53     VLC_MODULE_DESCRIPTION,
  54     VLC_MODULE_HELP,
  55     /* Insert new VLC_MODULE_* here */
  56
  57     /* DO NOT EVER REMOVE, INSERT OR REPLACE ANY ITEM! It would break the ABI!
  58      * Append new items at the end ONLY. */
  59     VLC_CONFIG_NAME=0x1000,
  60     /* command line name (args=const char *, vlc_callback_t) */
  61
  62     VLC_CONFIG_VALUE,
  63     /* actual value (args=int/double/const char *) */
  64
  65     VLC_CONFIG_RANGE,
  66     /* minimum value (args=int/double/const char * twice) */
  67
  68     VLC_CONFIG_ADVANCED,
  69     /* enable advanced flag (args=none) */
  70
  71     VLC_CONFIG_VOLATILE,
  72     /* don't write variable to storage (args=none) */
  73
  74     VLC_CONFIG_PERSISTENT,
  75     /* always write variable to storage (args=none) */
  76
  77     VLC_CONFIG_RESTART,
  78     /* restart required to apply value change (args=none) */
  79
  80     VLC_CONFIG_PRIVATE,
  81     /* hide from user (args=none) */
  82
  83     VLC_CONFIG_REMOVED,
  84     /* tag as no longer supported (args=none) */
  85
  86     VLC_CONFIG_CAPABILITY,
  87     /* capability for a module or list thereof (args=const char*) */
  88
  89     VLC_CONFIG_SHORTCUT,
  90     /* one-character (short) command line option name (args=char) */
  91
  92     VLC_CONFIG_OLDNAME,
  93     /* former option name (args=const char *) */
  94
  95     VLC_CONFIG_SAFE,
  96     /* tag as modifiable by untrusted input item "sources" (args=none) */
  97
  98     VLC_CONFIG_DESC,
  99     /* description (args=const char *, const char *, const char *) */
 100
 101     VLC_CONFIG_LIST,
 102     /* possible values list
 103      * (args=const char *, size_t, const <type> *, const char *const *) */
 104
 105     VLC_CONFIG_ADD_ACTION,
 106     /* add value change callback
 107      * (args=const char *, vlc_callback_t, const char *) */
 108
 109     /* Insert new VLC_CONFIG_* here */
 110 };
 111
 112 /*****************************************************************************
 113  * If we are not within a module, assume we're in the vlc core.
 114  *****************************************************************************/
 115 #if !defined( __PLUGIN__ ) && !defined( __BUILTIN__ )
 116 #   define MODULE_NAME main
 117 #endif
 118
 119 /**
 120  * Current plugin ABI version
 121  */
 122 # define MODULE_SYMBOL 1_0_0e
 123 # define MODULE_SUFFIX "__1_0_0e"
 124
 125 /*****************************************************************************
 126  * Add a few defines. You do not want to read this section. Really.
 127  *****************************************************************************/
 128
 129 /* Explanation:
 130  *
 131  * if linking a module statically, we will need:
 132  * #define MODULE_FUNC( zog ) module_foo_zog
 133  *
 134  * this can't easily be done with the C preprocessor, thus a few ugly hacks.
 135  */
 136
 137 /* I need to do _this_ to change « foo bar » to « module_foo_bar » ! */
 138 #define CONCATENATE( y, z ) CRUDE_HACK( y, z )
 139 #define CRUDE_HACK( y, z )  y##__##z
 140
 141 /* If the module is built-in, then we need to define foo_InitModule instead
 142  * of InitModule. Same for Activate- and DeactivateModule. */
 143 #ifdef __PLUGIN__
 144 #   define __VLC_SYMBOL( symbol  ) CONCATENATE( symbol, MODULE_SYMBOL )
 145 #else
 146 #   define __VLC_SYMBOL( symbol )  CONCATENATE( symbol, MODULE_NAME )
 147 #endif
 148
 149 #if defined( __PLUGIN__ ) && ( defined( WIN32 ) || defined( UNDER_CE ) )
 150 #   define DLL_SYMBOL              __declspec(dllexport)
 151 #   define CDECL_SYMBOL            __cdecl
 152 #else
 153 #   define DLL_SYMBOL
 154 #   define CDECL_SYMBOL
 155 #endif
 156
 157 #if defined( __cplusplus )
 158 #   define EXTERN_SYMBOL           extern "C"
 159 #else
 160 #   define EXTERN_SYMBOL
 161 #endif
 162
 163 /*
 164  * InitModule: this function is called once and only once, when the module
 165  * is looked at for the first time. We get the useful data from it, for
 166  * instance the module name, its shortcuts, its capabilities... we also create
 167  * a copy of its config because the module can be unloaded at any time.
 168  */
 169 #define vlc_module_begin( )                                                   \
 170     EXTERN_SYMBOL DLL_SYMBOL int CDECL_SYMBOL                                 \
 171     __VLC_SYMBOL(vlc_entry) ( module_t *p_module );                           \
 172                                                                               \
 173     EXTERN_SYMBOL DLL_SYMBOL int CDECL_SYMBOL                                 \
 174     __VLC_SYMBOL(vlc_entry) ( module_t *p_module )                            \
 175     {                                                                         \
 176         module_config_t *p_config = NULL;                                     \
 177         const char *domain = NULL;                                            \
 178         if (vlc_module_set (p_module, VLC_MODULE_NAME,                        \
 179                             (const char *)(MODULE_STRING)))                   \
 180             goto error;                                                       \
 181         {                                                                     \
 182             module_t *p_submodule = p_module;
 183
 184 #define vlc_module_end( )                                                     \
 185         }                                                                     \
 186         (void)p_config;                                                       \
 187         return VLC_SUCCESS;                                                   \
 188                                                                               \
 189     error:                                                                    \
 190         return VLC_EGENERIC;                                                  \
 191     }                                                                         \
 192     VLC_METADATA_EXPORTS
 193
 194 #define add_submodule( ) \
 195     if (vlc_plugin_set (p_module, NULL, VLC_SUBMODULE_CREATE, &p_submodule)) \
 196         goto error;
 197
 198 #define add_requirement( cap ) \
 199     if (vlc_module_set (p_module, VLC_MODULE_CPU_REQUIREMENT, \
 200                         (int)(CPU_CAPABILITY_##cap))) \
 201         goto error;
 202
 203 #define add_shortcut( shortcut ) \
 204     if (vlc_module_set (p_submodule, VLC_MODULE_SHORTCUT, \
 205         (const char *)(shortcut))) \
 206         goto error;
 207
 208 #define set_shortname( shortname ) \
 209     if (vlc_module_set (p_submodule, VLC_MODULE_SHORTNAME, domain, \
 210                         (const char *)(shortname))) \
 211         goto error;
 212
 213 #define set_description( desc ) \
 214     if (vlc_module_set (p_submodule, VLC_MODULE_DESCRIPTION, domain, \
 215                         (const char *)(desc))) \
 216         goto error;
 217
 218 #define set_help( help ) \
 219     if (vlc_module_set (p_submodule, VLC_MODULE_HELP, domain, \
 220                         (const char *)(help))) \
 221         goto error;
 222
 223 #define set_capability( cap, score ) \
 224     if (vlc_module_set (p_submodule, VLC_MODULE_CAPABILITY, \
 225                         (const char *)(cap)) \
 226      || vlc_module_set (p_submodule, VLC_MODULE_SCORE, (int)(score))) \
 227         goto error;
 228
 229 #define set_callbacks( activate, deactivate ) \
 230     if (vlc_module_set (p_submodule, VLC_MODULE_CB_OPEN, activate) \
 231      || vlc_module_set (p_submodule, VLC_MODULE_CB_CLOSE, deactivate)) \
 232         goto error;
 233
 234 #define linked_with_a_crap_library_which_uses_atexit( ) \
 235     if (vlc_module_set (p_submodule, VLC_MODULE_NO_UNLOAD)) \
 236         goto error;
 237
 238 #define set_text_domain( dom ) domain = (dom);
 239
 240 /*****************************************************************************
 241  * Macros used to build the configuration structure.
 242  *
 243  * Note that internally we support only 3 types of config data: int, float
 244  *   and string.
 245  *   The other types declared here just map to one of these 3 basic types but
 246  *   have the advantage of also providing very good hints to a configuration
 247  *   interface so as to make it more user friendly.
 248  * The configuration structure also includes category hints. These hints can
 249  *   provide a configuration interface with some very useful data and again
 250  *   allow for a more user friendly interface.
 251  *****************************************************************************/
 252
 253 #define add_type_inner( type ) \
 254     vlc_plugin_set (p_module, NULL, VLC_CONFIG_CREATE, (type), &p_config);
 255
 256 #define add_typedesc_inner( type, text, longtext ) \
 257     add_type_inner( type ) \
 258     vlc_config_set (p_config, VLC_CONFIG_DESC, domain, \
 259                     (const char *)(text), (const char *)(longtext));
 260
 261 #define add_typeadv_inner( type, text, longtext, advc ) \
 262     add_typedesc_inner( type, text, longtext ) \
 263     if (advc) vlc_config_set (p_config, VLC_CONFIG_ADVANCED);
 264
 265 #define add_typename_inner( type, name, text, longtext, advc, cb ) \
 266     add_typeadv_inner( type, text, longtext, advc ) \
 267     vlc_config_set (p_config, VLC_CONFIG_NAME, \
 268                     (const char *)(name), (vlc_callback_t)(cb));
 269
 270 #define add_string_inner( type, name, text, longtext, advc, cb, v ) \
 271     add_typename_inner( type, name, text, longtext, advc, cb ) \
 272     vlc_config_set (p_config, VLC_CONFIG_VALUE, (const char *)(v));
 273
 274 #define add_int_inner( type, name, text, longtext, advc, cb, v ) \
 275     add_typename_inner( type, name, text, longtext, advc, cb ) \
 276     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)(v));
 277
 278
 279 #define set_category( i_id ) \
 280     add_type_inner( CONFIG_CATEGORY ) \
 281     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)(i_id));
 282
 283 #define set_subcategory( i_id ) \
 284     add_type_inner( CONFIG_SUBCATEGORY ) \
 285     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)(i_id));
 286
 287 #define set_section( text, longtext ) \
 288     add_typedesc_inner( CONFIG_SECTION, text, longtext )
 289
 290 #define add_category_hint( text, longtext, advc ) \
 291     add_typeadv_inner( CONFIG_HINT_CATEGORY, text, longtext, advc )
 292
 293 #define add_subcategory_hint( text, longtext ) \
 294     add_typedesc_inner( CONFIG_HINT_SUBCATEGORY, text, longtext )
 295
 296 #define end_subcategory_hint \
 297     add_type_inner( CONFIG_HINT_SUBCATEGORY_END )
 298
 299 #define add_usage_hint( text ) \
 300     add_typedesc_inner( CONFIG_HINT_USAGE, text, NULL )
 301
 302 #define add_string( name, value, p_callback, text, longtext, advc ) \
 303     add_string_inner( CONFIG_ITEM_STRING, name, text, longtext, advc, \
 304                       p_callback, value )
 305
 306 #define add_password( name, value, p_callback, text, longtext, advc ) \
 307     add_string_inner( CONFIG_ITEM_PASSWORD, name, text, longtext, advc, \
 308                       p_callback, value )
 309
 310 #define add_file( name, value, p_callback, text, longtext, advc ) \
 311     add_string_inner( CONFIG_ITEM_FILE, name, text, longtext, advc, \
 312                       p_callback, value )
 313
 314 #define add_directory( name, value, p_callback, text, longtext, advc ) \
 315     add_string_inner( CONFIG_ITEM_DIRECTORY, name, text, longtext, advc, \
 316                       p_callback, value )
 317
 318 #define add_module( name, psz_caps, value, p_callback, text, longtext, advc ) \
 319     add_string_inner( CONFIG_ITEM_MODULE, name, text, longtext, advc, \
 320                       p_callback, value ) \
 321     vlc_config_set (p_config, VLC_CONFIG_CAPABILITY, (const char *)(psz_caps));
 322
 323 #define add_module_list( name, psz_caps, value, p_callback, text, longtext, advc ) \
 324     add_string_inner( CONFIG_ITEM_MODULE_LIST, name, text, longtext, advc, \
 325                       p_callback, value ) \
 326     vlc_config_set (p_config, VLC_CONFIG_CAPABILITY, (const char *)(psz_caps));
 327
 328 #ifndef __PLUGIN__
 329 #define add_module_cat( name, i_subcategory, value, p_callback, text, longtext, advc ) \
 330     add_string_inner( CONFIG_ITEM_MODULE_CAT, name, text, longtext, advc, \
 331                       p_callback, value ) \
 332     change_integer_range (i_subcategory /* gruik */, 0);
 333
 334 #define add_module_list_cat( name, i_subcategory, value, p_callback, text, longtext, advc ) \
 335     add_string_inner( CONFIG_ITEM_MODULE_LIST_CAT, name, text, longtext, \
 336                       advc, p_callback, value ) \
 337     change_integer_range (i_subcategory /* gruik */, 0);
 338 #endif
 339
 340 #define add_integer( name, value, p_callback, text, longtext, advc ) \
 341     add_int_inner( CONFIG_ITEM_INTEGER, name, text, longtext, advc, \
 342                    p_callback, value )
 343
 344 #if !defined(WIN32) && !defined(SYS_LINUX)
 345 #define add_key( name, value, p_callback, text, longtext, advc ) \
 346     add_int_inner( CONFIG_ITEM_KEY, name, text, longtext, advc, p_callback, \
 347                    value )
 348 #else
 349 #define add_key( name, value, p_callback, text, longtext, advc ) \
 350     add_int_inner( CONFIG_ITEM_KEY, name, text, longtext, advc, \
 351                    p_callback, value ) \
 352     add_int_inner( CONFIG_ITEM_KEY, "global-" name, text, longtext, advc, \
 353                    p_callback, KEY_UNSET )
 354 #endif
 355
 356 #define add_integer_with_range( name, value, i_min, i_max, p_callback, text, longtext, advc ) \
 357     add_integer( name, value, p_callback, text, longtext, advc ) \
 358     change_integer_range( i_min, i_max )
 359
 360 #define add_float( name, v, p_callback, text, longtext, advc ) \
 361     add_typename_inner( CONFIG_ITEM_FLOAT, name, text, longtext, advc, p_callback ) \
 362     vlc_config_set (p_config, VLC_CONFIG_VALUE, (double)(v));
 363
 364 #define add_float_with_range( name, value, f_min, f_max, p_callback, text, longtext, advc ) \
 365     add_float( name, value, p_callback, text, longtext, advc ) \
 366     change_float_range( f_min, f_max )
 367
 368 #define add_bool( name, v, p_callback, text, longtext, advc ) \
 369     add_typename_inner( CONFIG_ITEM_BOOL, name, text, longtext, advc, \
 370                         p_callback ) \
 371     if (v) vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)true);
 372
 373 /* For removed option */
 374 #define add_obsolete_inner( name, type ) \
 375     add_type_inner( type ) \
 376     vlc_config_set (p_config, VLC_CONFIG_NAME, \
 377                     (const char *)(name), (vlc_callback_t)NULL); \
 378     vlc_config_set (p_config, VLC_CONFIG_REMOVED);
 379
 380 #define add_obsolete_bool( name ) \
 381         add_obsolete_inner( name, CONFIG_ITEM_BOOL )
 382
 383 #define add_obsolete_integer( name ) \
 384         add_obsolete_inner( name, CONFIG_ITEM_INTEGER )
 385
 386 #define add_obsolete_float( name ) \
 387         add_obsolete_inner( name, CONFIG_ITEM_FLOAT )
 388
 389 #define add_obsolete_string( name ) \
 390         add_obsolete_inner( name, CONFIG_ITEM_STRING )
 391
 392 /* Modifier macros for the config options (used for fine tuning) */
 393
 394 #define add_deprecated_alias( name ) \
 395     vlc_config_set (p_config, VLC_CONFIG_OLDNAME, (const char *)(name));
 396
 397 #define change_short( ch ) \
 398     vlc_config_set (p_config, VLC_CONFIG_SHORTCUT, (int)(ch));
 399
 400 #define change_string_list( list, list_text, list_update_func ) \
 401     vlc_config_set (p_config, VLC_CONFIG_LIST, domain, \
 402                     (size_t)(sizeof (list) / sizeof (char *)), \
 403                     (const char *const *)(list), \
 404                     (const char *const *)(list_text), \
 405                     (vlc_callback_t)(list_update_func));
 406
 407 #define change_integer_list( list, list_text, list_update_func ) \
 408     vlc_config_set (p_config, VLC_CONFIG_LIST, domain, \
 409                     (size_t)(sizeof (list) / sizeof (int)), \
 410                     (const int *)(list), \
 411                     (const char *const *)(list_text), \
 412                     (vlc_callback_t)(list_update_func));
 413
 414 #define change_integer_range( minv, maxv ) \
 415     vlc_config_set (p_config, VLC_CONFIG_RANGE, (int)(minv), (int)(maxv));
 416
 417 #define change_float_range( minv, maxv ) \
 418     vlc_config_set (p_config, VLC_CONFIG_RANGE, \
 419                     (double)(minv), (double)(maxv));
 420
 421 #define change_action_add( pf_action, text ) \
 422     vlc_config_set (p_config, VLC_CONFIG_ADD_ACTION, domain, \
 423                     (vlc_callback_t)(pf_action), (const char *)(text));
 424
 425 #define change_internal() \
 426     vlc_config_set (p_config, VLC_CONFIG_PRIVATE);
 427
 428 #define change_need_restart() \
 429     vlc_config_set (p_config, VLC_CONFIG_RESTART);
 430
 431 #define change_autosave() \
 432     vlc_config_set (p_config, VLC_CONFIG_PERSISTENT);
 433
 434 #define change_unsaveable() \
 435     vlc_config_set (p_config, VLC_CONFIG_VOLATILE);
 436
 437 #define change_safe() \
 438     vlc_config_set (p_config, VLC_CONFIG_SAFE);
 439
 440 /* Meta data plugin exports */
 441 #define VLC_META_EXPORT( name, value ) \
 442     EXTERN_SYMBOL DLL_SYMBOL const char * CDECL_SYMBOL \
 443     __VLC_SYMBOL(vlc_entry_ ## name) (void); \
 444     EXTERN_SYMBOL DLL_SYMBOL const char * CDECL_SYMBOL \
 445     __VLC_SYMBOL(vlc_entry_ ## name) (void) \
 446     { \
 447          return value; \
 448     }
 449
 450 #if defined (__LIBVLC__)
 451 # define VLC_COPYRIGHT_EXPORT VLC_META_EXPORT (copyright, \
 452     "\x43\x6f\x70\x79\x72\x69\x67\x68\x74\x20\x28\x43\x29\x20\x74\x68" \
 453     "\x65\x20\x56\x69\x64\x65\x6f\x4c\x41\x4e\x20\x56\x4c\x43\x20\x6d" \
 454     "\x65\x64\x69\x61\x20\x70\x6c\x61\x79\x65\x72\x20\x64\x65\x76\x65" \
 455     "\x6c\x6f\x70\x70\x65\x72\x73" )
 456 #elif !defined (VLC_COPYRIGHT_EXPORT)
 457 # define VLC_COPYRIGHT_EXPORT
 458 #endif
 459 #define VLC_LICENSE_EXPORT VLC_META_EXPORT (license, \
 460     "\x4c\x69\x63\x65\x6e\x73\x65\x64\x20\x75\x6e\x64\x65\x72\x20\x74" \
 461     "\x68\x65\x20\x74\x65\x72\x6d\x73\x20\x6f\x66\x20\x74\x68\x65\x20" \
 462     "\x47\x4e\x55\x20\x47\x65\x6e\x65\x72\x61\x6c\x20\x50\x75\x62\x6c" \
 463     "\x69\x63\x20\x4c\x69\x63\x65\x6e\x73\x65\x2c\x20\x76\x65\x72\x73" \
 464     "\x69\x6f\x6e\x20\x32\x20\x6f\x72\x20\x6c\x61\x74\x65\x72\x2e" )
 465
 466 #define VLC_METADATA_EXPORTS \
 467     VLC_COPYRIGHT_EXPORT \
 468     VLC_LICENSE_EXPORT
 469
 470 #endif