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_API 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 *) */
  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_OBSOLETE,
  76     /* unused (ignored) */
  77
  78     VLC_CONFIG_PRIVATE,
  79     /* hide from user (args=none) */
  80
  81     VLC_CONFIG_REMOVED,
  82     /* tag as no longer supported (args=none) */
  83
  84     VLC_CONFIG_CAPABILITY,
  85     /* capability for a module or list thereof (args=const char*) */
  86
  87     VLC_CONFIG_SHORTCUT,
  88     /* one-character (short) command line option name (args=char) */
  89
  90     VLC_CONFIG_OLDNAME,
  91     /* former option name (args=const char *) */
  92
  93     VLC_CONFIG_SAFE,
  94     /* tag as modifiable by untrusted input item "sources" (args=none) */
  95
  96     VLC_CONFIG_DESC,
  97     /* description (args=const char *, const char *, const char *) */
  98
  99     VLC_CONFIG_LIST,
 100     /* possible values list
 101      * (args=const char *, size_t, const <type> *, const char *const *) */
 102
 103     VLC_CONFIG_ADD_ACTION,
 104     /* add value change callback
 105      * (args=const char *, vlc_callback_t, const char *) */
 106
 107     /* Insert new VLC_CONFIG_* here */
 108 };
 109
 110 /**
 111  * Current plugin ABI version
 112  */
 113 # define MODULE_SYMBOL 1_2_0h
 114 # define MODULE_SUFFIX "__1_2_0h"
 115
 116 /*****************************************************************************
 117  * Add a few defines. You do not want to read this section. Really.
 118  *****************************************************************************/
 119
 120 /* Explanation:
 121  *
 122  * if linking a module statically, we will need:
 123  * #define MODULE_FUNC( zog ) module_foo_zog
 124  *
 125  * this can't easily be done with the C preprocessor, thus a few ugly hacks.
 126  */
 127
 128 /* I need to do _this_ to change « foo bar » to « module_foo_bar » ! */
 129 #define CONCATENATE( y, z ) CRUDE_HACK( y, z )
 130 #define CRUDE_HACK( y, z )  y##__##z
 131
 132 /* If the module is built-in, then we need to define foo_InitModule instead
 133  * of InitModule. Same for Activate- and DeactivateModule. */
 134 #ifdef __PLUGIN__
 135 #   define __VLC_SYMBOL( symbol  ) CONCATENATE( symbol, MODULE_SYMBOL )
 136 #else
 137 #   define __VLC_SYMBOL( symbol )  CONCATENATE( symbol, MODULE_NAME )
 138 #endif
 139
 140 #define CDECL_SYMBOL
 141 #if defined (__PLUGIN__)
 142 # if defined (WIN32)
 143 #   define DLL_SYMBOL              __declspec(dllexport)
 144 #   undef CDECL_SYMBOL
 145 #   define CDECL_SYMBOL            __cdecl
 146 # elif defined (__GNUC__) && (__GNUC__ >= 4)
 147 #   define DLL_SYMBOL              __attribute__((visibility("default")))
 148 # else
 149 #  define DLL_SYMBOL
 150 # endif
 151 #else
 152 # define DLL_SYMBOL
 153 #endif
 154
 155 #if defined( __cplusplus )
 156 #   define EXTERN_SYMBOL           extern "C"
 157 #else
 158 #   define EXTERN_SYMBOL
 159 #endif
 160
 161 /*
 162  * InitModule: this function is called once and only once, when the module
 163  * is looked at for the first time. We get the useful data from it, for
 164  * instance the module name, its shortcuts, its capabilities... we also create
 165  * a copy of its config because the module can be unloaded at any time.
 166  */
 167 #define vlc_module_begin( )                                                   \
 168     EXTERN_SYMBOL DLL_SYMBOL int CDECL_SYMBOL                                 \
 169     __VLC_SYMBOL(vlc_entry) ( module_t *p_module );                           \
 170                                                                               \
 171     EXTERN_SYMBOL DLL_SYMBOL int CDECL_SYMBOL                                 \
 172     __VLC_SYMBOL(vlc_entry) ( module_t *p_module )                            \
 173     {                                                                         \
 174         module_config_t *p_config = NULL;                                     \
 175         if (vlc_module_set (p_module, VLC_MODULE_NAME,                        \
 176                             (const char *)(MODULE_STRING)))                   \
 177             goto error;                                                       \
 178         {                                                                     \
 179             module_t *p_submodule = p_module;
 180
 181 #define vlc_module_end( )                                                     \
 182         }                                                                     \
 183         (void)p_config;                                                       \
 184         return VLC_SUCCESS;                                                   \
 185                                                                               \
 186     error:                                                                    \
 187         return VLC_EGENERIC;                                                  \
 188     }                                                                         \
 189     VLC_METADATA_EXPORTS
 190
 191 #define add_submodule( ) \
 192     if (vlc_plugin_set (p_module, NULL, VLC_SUBMODULE_CREATE, &p_submodule)) \
 193         goto error;
 194
 195 #define add_shortcut( ... ) \
 196 { \
 197     const char *shortcuts[] = { __VA_ARGS__ }; \
 198     if (vlc_module_set (p_submodule, VLC_MODULE_SHORTCUT, \
 199                         sizeof(shortcuts)/sizeof(shortcuts[0]), shortcuts)) \
 200         goto error; \
 201 }
 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 cannot_unload_broken_library( ) \
 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 ) \
 263     add_typeadv_inner( type, text, longtext, advc ) \
 264     vlc_config_set (p_config, VLC_CONFIG_NAME, \
 265                     (const char *)(name));
 266
 267 #define add_string_inner( type, name, text, longtext, advc, v ) \
 268     add_typename_inner( type, name, text, longtext, advc ) \
 269     vlc_config_set (p_config, VLC_CONFIG_VALUE, (const char *)(v));
 270
 271 #define add_int_inner( type, name, text, longtext, advc, v ) \
 272     add_typename_inner( type, name, text, longtext, advc ) \
 273     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int64_t)(v));
 274
 275
 276 #define set_category( i_id ) \
 277     add_type_inner( CONFIG_CATEGORY ) \
 278     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int64_t)(i_id));
 279
 280 #define set_subcategory( i_id ) \
 281     add_type_inner( CONFIG_SUBCATEGORY ) \
 282     vlc_config_set (p_config, VLC_CONFIG_VALUE, (int64_t)(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, text, longtext, advc ) \
 300     add_string_inner( CONFIG_ITEM_STRING, name, text, longtext, advc, \
 301                       value )
 302
 303 #define add_password( name, value, text, longtext, advc ) \
 304     add_string_inner( CONFIG_ITEM_PASSWORD, name, text, longtext, advc, \
 305                       value )
 306
 307 #define add_loadfile( name, value, text, longtext, advc ) \
 308     add_string_inner( CONFIG_ITEM_LOADFILE, name, text, longtext, advc, \
 309                       value )
 310
 311 #define add_savefile( name, value, text, longtext, advc ) \
 312     add_string_inner( CONFIG_ITEM_SAVEFILE, name, text, longtext, advc, \
 313                       value )
 314
 315 #define add_directory( name, value, text, longtext, advc ) \
 316     add_string_inner( CONFIG_ITEM_DIRECTORY, name, text, longtext, advc, \
 317                       value )
 318
 319 #define add_font( name, value, text, longtext, advc )\
 320     add_string_inner( CONFIG_ITEM_FONT, name, text, longtext, advc, \
 321                       value )
 322
 323 #define add_module( name, psz_caps, value, text, longtext, advc ) \
 324     add_string_inner( CONFIG_ITEM_MODULE, name, text, longtext, advc, \
 325                       value ) \
 326     vlc_config_set (p_config, VLC_CONFIG_CAPABILITY, (const char *)(psz_caps));
 327
 328 #define add_module_list( name, psz_caps, value, text, longtext, advc ) \
 329     add_string_inner( CONFIG_ITEM_MODULE_LIST, name, text, longtext, advc, \
 330                       value ) \
 331     vlc_config_set (p_config, VLC_CONFIG_CAPABILITY, (const char *)(psz_caps));
 332
 333 #ifndef __PLUGIN__
 334 #define add_module_cat( name, i_subcategory, value, text, longtext, advc ) \
 335     add_string_inner( CONFIG_ITEM_MODULE_CAT, name, text, longtext, advc, \
 336                       value ) \
 337     change_integer_range (i_subcategory /* gruik */, 0);
 338
 339 #define add_module_list_cat( name, i_subcategory, value, text, longtext, advc ) \
 340     add_string_inner( CONFIG_ITEM_MODULE_LIST_CAT, name, text, longtext, \
 341                       advc, value ) \
 342     change_integer_range (i_subcategory /* gruik */, 0);
 343 #endif
 344
 345 #define add_integer( name, value, text, longtext, advc ) \
 346     add_int_inner( CONFIG_ITEM_INTEGER, name, text, longtext, advc, value )
 347
 348 #define add_key( name, value, text, longtext, advc ) \
 349     add_string_inner( CONFIG_ITEM_KEY, "global-" name, text, longtext, advc, \
 350                    KEY_UNSET ) \
 351     add_string_inner( CONFIG_ITEM_KEY, name, text, longtext, advc, value )
 352
 353 #define add_integer_with_range( name, value, i_min, i_max, text, longtext, advc ) \
 354     add_integer( name, value, text, longtext, advc ) \
 355     change_integer_range( i_min, i_max )
 356
 357 #define add_float( name, v, text, longtext, advc ) \
 358     add_typename_inner( CONFIG_ITEM_FLOAT, name, text, longtext, advc ) \
 359     vlc_config_set (p_config, VLC_CONFIG_VALUE, (double)(v));
 360
 361 #define add_float_with_range( name, value, f_min, f_max, text, longtext, advc ) \
 362     add_float( name, value, text, longtext, advc ) \
 363     change_float_range( f_min, f_max )
 364
 365 #define add_bool( name, v, text, longtext, advc ) \
 366     add_typename_inner( CONFIG_ITEM_BOOL, name, text, longtext, advc ) \
 367     if (v) vlc_config_set (p_config, VLC_CONFIG_VALUE, (int64_t)true);
 368
 369 /* For removed option */
 370 #define add_obsolete_inner( name, type ) \
 371     add_type_inner( type ) \
 372     vlc_config_set (p_config, VLC_CONFIG_NAME, \
 373                     (const char *)(name)); \
 374     vlc_config_set (p_config, VLC_CONFIG_REMOVED);
 375
 376 #define add_obsolete_bool( name ) \
 377         add_obsolete_inner( name, CONFIG_ITEM_BOOL )
 378
 379 #define add_obsolete_integer( name ) \
 380         add_obsolete_inner( name, CONFIG_ITEM_INTEGER )
 381
 382 #define add_obsolete_float( name ) \
 383         add_obsolete_inner( name, CONFIG_ITEM_FLOAT )
 384
 385 #define add_obsolete_string( name ) \
 386         add_obsolete_inner( name, CONFIG_ITEM_STRING )
 387
 388 /* Modifier macros for the config options (used for fine tuning) */
 389
 390 #define add_deprecated_alias( name ) \
 391     vlc_config_set (p_config, VLC_CONFIG_OLDNAME, (const char *)(name));
 392
 393 #define change_short( ch ) \
 394     vlc_config_set (p_config, VLC_CONFIG_SHORTCUT, (int)(ch));
 395
 396 #define change_string_list( list, list_text, list_update_func ) \
 397     vlc_config_set (p_config, VLC_CONFIG_LIST, \
 398                     (size_t)(sizeof (list) / sizeof (char *)), \
 399                     (const char *const *)(list), \
 400                     (const char *const *)(list_text), \
 401                     (vlc_callback_t)(list_update_func));
 402
 403 #define change_integer_list( list, list_text ) \
 404     vlc_config_set (p_config, VLC_CONFIG_LIST, \
 405                     (size_t)(sizeof (list) / sizeof (int)), \
 406                     (const int *)(list), \
 407                     (const char *const *)(list_text), \
 408                     (vlc_callback_t)(NULL));
 409
 410 #define change_integer_range( minv, maxv ) \
 411     vlc_config_set (p_config, VLC_CONFIG_RANGE, \
 412                     (int64_t)(minv), (int64_t)(maxv));
 413
 414 #define change_float_range( minv, maxv ) \
 415     vlc_config_set (p_config, VLC_CONFIG_RANGE, \
 416                     (double)(minv), (double)(maxv));
 417
 418 #define change_action_add( pf_action, text ) \
 419     vlc_config_set (p_config, VLC_CONFIG_ADD_ACTION, \
 420                     (vlc_callback_t)(pf_action), (const char *)(text));
 421
 422 /* For options that are saved but hidden from the preferences panel */
 423 #define change_private() \
 424     vlc_config_set (p_config, VLC_CONFIG_PRIVATE);
 425
 426 /* For options that cannot be saved in the configuration */
 427 #define change_volatile() \
 428     change_private() \
 429     vlc_config_set (p_config, VLC_CONFIG_VOLATILE);
 430
 431 #define change_safe() \
 432     vlc_config_set (p_config, VLC_CONFIG_SAFE);
 433
 434 /* Meta data plugin exports */
 435 #define VLC_META_EXPORT( name, value ) \
 436     EXTERN_SYMBOL DLL_SYMBOL const char * CDECL_SYMBOL \
 437     __VLC_SYMBOL(vlc_entry_ ## name) (void); \
 438     EXTERN_SYMBOL DLL_SYMBOL const char * CDECL_SYMBOL \
 439     __VLC_SYMBOL(vlc_entry_ ## name) (void) \
 440     { \
 441          return value; \
 442     }
 443
 444 #if defined (__LIBVLC__)
 445 # define VLC_COPYRIGHT_EXPORT VLC_META_EXPORT (copyright, \
 446     "\x43\x6f\x70\x79\x72\x69\x67\x68\x74\x20\x28\x43\x29\x20\x74\x68" \
 447     "\x65\x20\x56\x69\x64\x65\x6f\x4c\x41\x4e\x20\x56\x4c\x43\x20\x6d" \
 448     "\x65\x64\x69\x61\x20\x70\x6c\x61\x79\x65\x72\x20\x64\x65\x76\x65" \
 449     "\x6c\x6f\x70\x65\x72\x73" )
 450 #elif !defined (VLC_COPYRIGHT_EXPORT)
 451 # define VLC_COPYRIGHT_EXPORT
 452 #endif
 453 #define VLC_LICENSE_EXPORT VLC_META_EXPORT (license, \
 454     "\x4c\x69\x63\x65\x6e\x73\x65\x64\x20\x75\x6e\x64\x65\x72\x20\x74" \
 455     "\x68\x65\x20\x74\x65\x72\x6d\x73\x20\x6f\x66\x20\x74\x68\x65\x20" \
 456     "\x47\x4e\x55\x20\x47\x65\x6e\x65\x72\x61\x6c\x20\x50\x75\x62\x6c" \
 457     "\x69\x63\x20\x4c\x69\x63\x65\x6e\x73\x65\x2c\x20\x76\x65\x72\x73" \
 458     "\x69\x6f\x6e\x20\x32\x20\x6f\x72\x20\x6c\x61\x74\x65\x72\x2e" )
 459
 460 #define VLC_METADATA_EXPORTS \
 461     VLC_COPYRIGHT_EXPORT \
 462     VLC_LICENSE_EXPORT
 463
 464 #endif