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     VLC_MODULE_TEXTDOMAIN,
  56     /* Insert new VLC_MODULE_* here */
  57
  58     /* DO NOT EVER REMOVE, INSERT OR REPLACE ANY ITEM! It would break the ABI!
  59      * Append new items at the end ONLY. */
  60     VLC_CONFIG_NAME=0x1000,
  61     /* command line name (args=const char *, vlc_callback_t) */
  62
  63     VLC_CONFIG_VALUE,
  64     /* actual value (args=int/double/const char *) */
  65
  66     VLC_CONFIG_RANGE,
  67     /* minimum value (args=int/double/const char * twice) */
  68
  69     VLC_CONFIG_ADVANCED,
  70     /* enable advanced flag (args=none) */
  71
  72     VLC_CONFIG_VOLATILE,
  73     /* don't write variable to storage (args=none) */
  74
  75     VLC_CONFIG_PERSISTENT,
  76     /* always write variable to storage (args=none) */
  77
  78     VLC_CONFIG_RESTART,
  79     /* restart required to apply value change (args=none) */
  80
  81     VLC_CONFIG_PRIVATE,
  82     /* hide from user (args=none) */
  83
  84     VLC_CONFIG_REMOVED,
  85     /* tag as no longer supported (args=none) */
  86
  87     VLC_CONFIG_CAPABILITY,
  88     /* capability for a module or list thereof (args=const char*) */
  89
  90     VLC_CONFIG_SHORTCUT,
  91     /* one-character (short) command line option name (args=char) */
  92
  93     VLC_CONFIG_OLDNAME,
  94     /* former option name (args=const char *) */
  95
  96     VLC_CONFIG_SAFE,
  97     /* tag as modifiable by untrusted input item "sources" (args=none) */
  98
  99     VLC_CONFIG_DESC,
 100     /* description (args=const char *, const char *, const char *) */
 101
 102     VLC_CONFIG_LIST,
 103     /* possible values list
 104      * (args=const char *, size_t, const <type> *, const char *const *) */
 105
 106     VLC_CONFIG_ADD_ACTION,
 107     /* add value change callback
 108      * (args=const char *, vlc_callback_t, const char *) */
 109
 110     /* Insert new VLC_CONFIG_* here */
 111 };
 112
 113 /*****************************************************************************
 114  * If we are not within a module, assume we're in the vlc core.
 115  *****************************************************************************/
 116 #if !defined( __PLUGIN__ ) && !defined( __BUILTIN__ )
 117 #   define MODULE_NAME main
 118 #endif
 119
 120 /**
 121  * Current plugin ABI version
 122  */
 123 # define MODULE_SYMBOL 1_1_0e
 124 # define MODULE_SUFFIX "__1_1_0e"
 125
 126 /*****************************************************************************
 127  * Add a few defines. You do not want to read this section. Really.
 128  *****************************************************************************/
 129
 130 /* Explanation:
 131  *
 132  * if linking a module statically, we will need:
 133  * #define MODULE_FUNC( zog ) module_foo_zog
 134  *
 135  * this can't easily be done with the C preprocessor, thus a few ugly hacks.
 136  */
 137
 138 /* I need to do _this_ to change « foo bar » to « module_foo_bar » ! */
 139 #define CONCATENATE( y, z ) CRUDE_HACK( y, z )
 140 #define CRUDE_HACK( y, z )  y##__##z
 141
 142 /* If the module is built-in, then we need to define foo_InitModule instead
 143  * of InitModule. Same for Activate- and DeactivateModule. */
 144 #ifdef __PLUGIN__
 145 #   define __VLC_SYMBOL( symbol  ) CONCATENATE( symbol, MODULE_SYMBOL )
 146 #else
 147 #   define __VLC_SYMBOL( symbol )  CONCATENATE( symbol, MODULE_NAME )
 148 #endif
 149
 150 #if defined( __PLUGIN__ ) && ( defined( WIN32 ) || defined( UNDER_CE ) )
 151 #   define DLL_SYMBOL              __declspec(dllexport)
 152 #   define CDECL_SYMBOL            __cdecl
 153 #else
 154 #   define DLL_SYMBOL
 155 #   define CDECL_SYMBOL
 156 #endif
 157
 158 #if defined( __cplusplus )
 159 #   define EXTERN_SYMBOL           extern "C"
 160 #else
 161 #   define EXTERN_SYMBOL
 162 #endif
 163
 164 /*
 165  * InitModule: this function is called once and only once, when the module
 166  * is looked at for the first time. We get the useful data from it, for
 167  * instance the module name, its shortcuts, its capabilities... we also create
 168  * a copy of its config because the module can be unloaded at any time.
 169  */
 170 #define vlc_module_begin( )                                                   \
 171     EXTERN_SYMBOL DLL_SYMBOL int CDECL_SYMBOL                                 \
 172     __VLC_SYMBOL(vlc_entry) ( module_t *p_module );                           \
 173                                                                               \
 174     EXTERN_SYMBOL DLL_SYMBOL int CDECL_SYMBOL                                 \
 175     __VLC_SYMBOL(vlc_entry) ( module_t *p_module )                            \
 176     {                                                                         \
 177         module_config_t *p_config = 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_shortcut( shortcut ) \
 199     if (vlc_module_set (p_submodule, VLC_MODULE_SHORTCUT, \
 200         (const char *)(shortcut))) \
 201         goto error;
 202
 203 #define set_shortname( shortname ) \
 204     if (vlc_module_set (p_submodule, VLC_MODULE_SHORTNAME, \
 205                         (const char *)(shortname))) \
 206         goto error;
 207
 208 #define set_description( desc ) \
 209     if (vlc_module_set (p_submodule, VLC_MODULE_DESCRIPTION, \
 210                         (const char *)(desc))) \
 211         goto error;
 212
 213 #define set_help( help ) \
 214     if (vlc_module_set (p_submodule, VLC_MODULE_HELP, \
 215                         (const char *)(help))) \
 216         goto error;
 217
 218 #define set_capability( cap, score ) \
 219     if (vlc_module_set (p_submodule, VLC_MODULE_CAPABILITY, \
 220                         (const char *)(cap)) \
 221      || vlc_module_set (p_submodule, VLC_MODULE_SCORE, (int)(score))) \
 222         goto error;
 223
 224 #define set_callbacks( activate, deactivate ) \
 225     if (vlc_module_set (p_submodule, VLC_MODULE_CB_OPEN, activate) \
 226      || vlc_module_set (p_submodule, VLC_MODULE_CB_CLOSE, deactivate)) \
 227         goto error;
 228
 229 #define linked_with_a_crap_library_which_uses_atexit( ) \
 230     if (vlc_module_set (p_submodule, VLC_MODULE_NO_UNLOAD)) \
 231         goto error;
 232
 233 #define set_text_domain( dom ) \
 234     if (vlc_module_set (p_module, VLC_MODULE_TEXTDOMAIN, (dom))) \
 235         goto error;
 236
 237 /*****************************************************************************
 238  * Macros used to build the configuration structure.
 239  *
 240  * Note that internally we support only 3 types of config data: int, float
 241  *   and string.
 242  *   The other types declared here just map to one of these 3 basic types but
 243  *   have the advantage of also providing very good hints to a configuration
 244  *   interface so as to make it more user friendly.
 245  * The configuration structure also includes category hints. These hints can
 246  *   provide a configuration interface with some very useful data and again
 247  *   allow for a more user friendly interface.
 248  *****************************************************************************/
 249
 250 #define add_type_inner( type ) \
 251     vlc_plugin_set (p_module, NULL, VLC_CONFIG_CREATE, (type), &p_config);
 252
 253 #define add_typedesc_inner( type, text, longtext ) \
 254     add_type_inner( type ) \
 255     vlc_config_set (p_config, VLC_CONFIG_DESC, \
 256                     (const char *)(text), (const char *)(longtext));
 257
 258 #define add_typeadv_inner( type, text, longtext, advc ) \
 259     add_typedesc_inner( type, text, longtext ) \
 260     if (advc) vlc_config_set (p_config, VLC_CONFIG_ADVANCED);
 261
 262 #define add_typename_inner( type, name, text, longtext, advc, cb ) \
 263     add_typeadv_inner( type, text, longtext, advc ) \
 264     vlc_config_set (p_config, VLC_CONFIG_NAME, \
 265                     (const char *)(name), (vlc_callback_t)(cb));
 266
 267 #define add_string_inner( type, name, text, longtext, advc, cb, v ) \
 268     add_typename_inner( type, name, text, longtext, advc, cb ) \
 269     vlc_config_set (p_config, VLC_CONFIG_VALUE, (const char *)(v));
 270
 271 #define add_int_inner( type, name, text, longtext, advc, cb, v ) \
 272     add_typename_inner( type, name, text, longtext, advc, cb ) \
 273     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)(v));
 274
 275
 276 #define set_category( i_id ) \
 277     add_type_inner( CONFIG_CATEGORY ) \
 278     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)(i_id));
 279
 280 #define set_subcategory( i_id ) \
 281     add_type_inner( CONFIG_SUBCATEGORY ) \
 282     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)(i_id));
 283
 284 #define set_section( text, longtext ) \
 285     add_typedesc_inner( CONFIG_SECTION, text, longtext )
 286
 287 #define add_category_hint( text, longtext, advc ) \
 288     add_typeadv_inner( CONFIG_HINT_CATEGORY, text, longtext, advc )
 289
 290 #define add_subcategory_hint( text, longtext ) \
 291     add_typedesc_inner( CONFIG_HINT_SUBCATEGORY, text, longtext )
 292
 293 #define end_subcategory_hint \
 294     add_type_inner( CONFIG_HINT_SUBCATEGORY_END )
 295
 296 #define add_usage_hint( text ) \
 297     add_typedesc_inner( CONFIG_HINT_USAGE, text, NULL )
 298
 299 #define add_string( name, value, p_callback, text, longtext, advc ) \
 300     add_string_inner( CONFIG_ITEM_STRING, name, text, longtext, advc, \
 301                       p_callback, value )
 302
 303 #define add_password( name, value, p_callback, text, longtext, advc ) \
 304     add_string_inner( CONFIG_ITEM_PASSWORD, name, text, longtext, advc, \
 305                       p_callback, value )
 306
 307 #define add_file( name, value, p_callback, text, longtext, advc ) \
 308     add_string_inner( CONFIG_ITEM_FILE, name, text, longtext, advc, \
 309                       p_callback, value )
 310
 311 #define add_directory( name, value, p_callback, text, longtext, advc ) \
 312     add_string_inner( CONFIG_ITEM_DIRECTORY, name, text, longtext, advc, \
 313                       p_callback, value )
 314
 315 #define add_font( name, value, p_callback, text, longtext, advc )\
 316     add_string_inner( CONFIG_ITEM_FONT, name, text, longtext, advc, \
 317                       p_callback, value )
 318
 319 #define add_module( name, psz_caps, value, p_callback, text, longtext, advc ) \
 320     add_string_inner( CONFIG_ITEM_MODULE, name, text, longtext, advc, \
 321                       p_callback, value ) \
 322     vlc_config_set (p_config, VLC_CONFIG_CAPABILITY, (const char *)(psz_caps));
 323
 324 #define add_module_list( name, psz_caps, value, p_callback, text, longtext, advc ) \
 325     add_string_inner( CONFIG_ITEM_MODULE_LIST, name, text, longtext, advc, \
 326                       p_callback, value ) \
 327     vlc_config_set (p_config, VLC_CONFIG_CAPABILITY, (const char *)(psz_caps));
 328
 329 #ifndef __PLUGIN__
 330 #define add_module_cat( name, i_subcategory, value, p_callback, text, longtext, advc ) \
 331     add_string_inner( CONFIG_ITEM_MODULE_CAT, name, text, longtext, advc, \
 332                       p_callback, value ) \
 333     change_integer_range (i_subcategory /* gruik */, 0);
 334
 335 #define add_module_list_cat( name, i_subcategory, value, p_callback, text, longtext, advc ) \
 336     add_string_inner( CONFIG_ITEM_MODULE_LIST_CAT, name, text, longtext, \
 337                       advc, p_callback, value ) \
 338     change_integer_range (i_subcategory /* gruik */, 0);
 339 #endif
 340
 341 #define add_integer( name, value, p_callback, text, longtext, advc ) \
 342     add_int_inner( CONFIG_ITEM_INTEGER, name, text, longtext, advc, \
 343                    p_callback, value )
 344
 345 #define add_key( name, value, p_callback, text, longtext, advc ) \
 346     add_int_inner( CONFIG_ITEM_KEY, name, text, longtext, advc, \
 347                    p_callback, value ) \
 348     add_int_inner( CONFIG_ITEM_KEY, "global-" name, text, longtext, advc, \
 349                    p_callback, KEY_UNSET )
 350
 351 #define add_integer_with_range( name, value, i_min, i_max, p_callback, text, longtext, advc ) \
 352     add_integer( name, value, p_callback, text, longtext, advc ) \
 353     change_integer_range( i_min, i_max )
 354
 355 #define add_float( name, v, p_callback, text, longtext, advc ) \
 356     add_typename_inner( CONFIG_ITEM_FLOAT, name, text, longtext, advc, p_callback ) \
 357     vlc_config_set (p_config, VLC_CONFIG_VALUE, (double)(v));
 358
 359 #define add_float_with_range( name, value, f_min, f_max, p_callback, text, longtext, advc ) \
 360     add_float( name, value, p_callback, text, longtext, advc ) \
 361     change_float_range( f_min, f_max )
 362
 363 #define add_bool( name, v, p_callback, text, longtext, advc ) \
 364     add_typename_inner( CONFIG_ITEM_BOOL, name, text, longtext, advc, \
 365                         p_callback ) \
 366     if (v) vlc_config_set (p_config, VLC_CONFIG_VALUE, (int)true);
 367
 368 /* For removed option */
 369 #define add_obsolete_inner( name, type ) \
 370     add_type_inner( type ) \
 371     vlc_config_set (p_config, VLC_CONFIG_NAME, \
 372                     (const char *)(name), (vlc_callback_t)NULL); \
 373     vlc_config_set (p_config, VLC_CONFIG_REMOVED);
 374
 375 #define add_obsolete_bool( name ) \
 376         add_obsolete_inner( name, CONFIG_ITEM_BOOL )
 377
 378 #define add_obsolete_integer( name ) \
 379         add_obsolete_inner( name, CONFIG_ITEM_INTEGER )
 380
 381 #define add_obsolete_float( name ) \
 382         add_obsolete_inner( name, CONFIG_ITEM_FLOAT )
 383
 384 #define add_obsolete_string( name ) \
 385         add_obsolete_inner( name, CONFIG_ITEM_STRING )
 386
 387 /* Modifier macros for the config options (used for fine tuning) */
 388
 389 #define add_deprecated_alias( name ) \
 390     vlc_config_set (p_config, VLC_CONFIG_OLDNAME, (const char *)(name));
 391
 392 #define change_short( ch ) \
 393     vlc_config_set (p_config, VLC_CONFIG_SHORTCUT, (int)(ch));
 394
 395 #define change_string_list( list, list_text, list_update_func ) \
 396     vlc_config_set (p_config, VLC_CONFIG_LIST, \
 397                     (size_t)(sizeof (list) / sizeof (char *)), \
 398                     (const char *const *)(list), \
 399                     (const char *const *)(list_text), \
 400                     (vlc_callback_t)(list_update_func));
 401
 402 #define change_integer_list( list, list_text, list_update_func ) \
 403     vlc_config_set (p_config, VLC_CONFIG_LIST, \
 404                     (size_t)(sizeof (list) / sizeof (int)), \
 405                     (const int *)(list), \
 406                     (const char *const *)(list_text), \
 407                     (vlc_callback_t)(list_update_func));
 408
 409 #define change_integer_range( minv, maxv ) \
 410     vlc_config_set (p_config, VLC_CONFIG_RANGE, (int)(minv), (int)(maxv));
 411
 412 #define change_float_range( minv, maxv ) \
 413     vlc_config_set (p_config, VLC_CONFIG_RANGE, \
 414                     (double)(minv), (double)(maxv));
 415
 416 #define change_action_add( pf_action, text ) \
 417     vlc_config_set (p_config, VLC_CONFIG_ADD_ACTION, \
 418                     (vlc_callback_t)(pf_action), (const char *)(text));
 419
 420 #define change_internal() \
 421     vlc_config_set (p_config, VLC_CONFIG_PRIVATE);
 422
 423 #define change_need_restart() \
 424     vlc_config_set (p_config, VLC_CONFIG_RESTART);
 425
 426 #define change_autosave() \
 427     vlc_config_set (p_config, VLC_CONFIG_PERSISTENT);
 428
 429 #define change_unsaveable() \
 430     vlc_config_set (p_config, VLC_CONFIG_VOLATILE);
 431
 432 #define change_safe() \
 433     vlc_config_set (p_config, VLC_CONFIG_SAFE);
 434
 435 /* Meta data plugin exports */
 436 #define VLC_META_EXPORT( name, value ) \
 437     EXTERN_SYMBOL DLL_SYMBOL const char * CDECL_SYMBOL \
 438     __VLC_SYMBOL(vlc_entry_ ## name) (void); \
 439     EXTERN_SYMBOL DLL_SYMBOL const char * CDECL_SYMBOL \
 440     __VLC_SYMBOL(vlc_entry_ ## name) (void) \
 441     { \
 442          return value; \
 443     }
 444
 445 #if defined (__LIBVLC__)
 446 # define VLC_COPYRIGHT_EXPORT VLC_META_EXPORT (copyright, \
 447     "\x43\x6f\x70\x79\x72\x69\x67\x68\x74\x20\x28\x43\x29\x20\x74\x68" \
 448     "\x65\x20\x56\x69\x64\x65\x6f\x4c\x41\x4e\x20\x56\x4c\x43\x20\x6d" \
 449     "\x65\x64\x69\x61\x20\x70\x6c\x61\x79\x65\x72\x20\x64\x65\x76\x65" \
 450     "\x6c\x6f\x70\x65\x72\x73" )
 451 #elif !defined (VLC_COPYRIGHT_EXPORT)
 452 # define VLC_COPYRIGHT_EXPORT
 453 #endif
 454 #define VLC_LICENSE_EXPORT VLC_META_EXPORT (license, \
 455     "\x4c\x69\x63\x65\x6e\x73\x65\x64\x20\x75\x6e\x64\x65\x72\x20\x74" \
 456     "\x68\x65\x20\x74\x65\x72\x6d\x73\x20\x6f\x66\x20\x74\x68\x65\x20" \
 457     "\x47\x4e\x55\x20\x47\x65\x6e\x65\x72\x61\x6c\x20\x50\x75\x62\x6c" \
 458     "\x69\x63\x20\x4c\x69\x63\x65\x6e\x73\x65\x2c\x20\x76\x65\x72\x73" \
 459     "\x69\x6f\x6e\x20\x32\x20\x6f\x72\x20\x6c\x61\x74\x65\x72\x2e" )
 460
 461 #define VLC_METADATA_EXPORTS \
 462     VLC_COPYRIGHT_EXPORT \
 463     VLC_LICENSE_EXPORT
 464
 465 #endif