git.sesse.net Git - vlc/blob - modules/demux/playlist/luaplaylist.c

   1 /*****************************************************************************
   2  * luaplaylist.c :  Lua playlist demux module
   3  *****************************************************************************
   4  * Copyright (C) 2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea at videolan tod 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 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc_demux.h>
  29 #include <vlc_url.h>
  30 #include <vlc_strings.h>
  31 #include <vlc_charset.h>
  32
  33 #include <errno.h>                                                 /* ENOMEM */
  34 #include "playlist.h"
  35
  36 #ifdef HAVE_SYS_STAT_H
  37 #   include <sys/stat.h>
  38 #endif
  39
  40 #include <lua.h>        /* Low level lua C API */
  41 #include <lauxlib.h>    /* Higher level C API */
  42 #include <lualib.h>     /* Lua libs */
  43
  44 /*****************************************************************************
  45  * Local prototypes
  46  *****************************************************************************/
  47 static int E_(Import_LuaPlaylist)( vlc_object_t *p_this );
  48 static void E_(Close_LuaPlaylist)( vlc_object_t *p_this );
  49
  50 static int Demux( demux_t *p_demux );
  51 static int Control( demux_t *p_demux, int i_query, va_list args );
  52
  53 /*****************************************************************************
  54  * Module descriptor
  55  *****************************************************************************/
  56 vlc_module_begin();
  57     add_shortcut( "lua" );
  58     set_category( CAT_INPUT );
  59     set_subcategory( SUBCAT_INPUT_DEMUX );
  60
  61     set_shortname( _("Lua Playlist") );
  62     set_description( _("Lua Playlist Parser Interface") );
  63     set_capability( "demux2", 9 );
  64     set_callbacks( E_(Import_LuaPlaylist), E_(Close_LuaPlaylist) );
  65 vlc_module_end();
  66
  67 /*****************************************************************************
  68  *
  69  *****************************************************************************/
  70 struct demux_sys_t
  71 {
  72     lua_State *p_state;
  73     char *psz_filename;
  74 };
  75
  76 /*****************************************************************************
  77  *
  78  *****************************************************************************/
  79 static demux_t *vlclua_get_demux( lua_State *p_state )
  80 {
  81     demux_t *p_demux;
  82     lua_getglobal( p_state, "vlc" );
  83     lua_getfield( p_state, lua_gettop( p_state ), "private" );
  84     p_demux = (demux_t*)lua_topointer( p_state, lua_gettop( p_state ) );
  85     lua_pop( p_state, 2 );
  86     return p_demux;
  87 }
  88
  89 static int vlclua_peek( lua_State *p_state )
  90 {
  91     demux_t *p_demux = vlclua_get_demux( p_state );
  92     int i = lua_gettop( p_state );
  93     int n;
  94     byte_t *p_peek;
  95     int i_peek;
  96     if( !i ) return 0;
  97     n = lua_tonumber( p_state, 1 );
  98     lua_pop( p_state, i );
  99     i_peek = stream_Peek( p_demux->s, &p_peek, n );
 100     lua_pushlstring( p_state, (const char *)p_peek, i_peek );
 101     return 1;
 102 }
 103
 104 static int vlclua_read( lua_State *p_state )
 105 {
 106     demux_t *p_demux = vlclua_get_demux( p_state );
 107     int i = lua_gettop( p_state );
 108     int n;
 109     byte_t *p_read;
 110     int i_read;
 111     if( !i ) return 0;
 112     n = lua_tonumber( p_state, 1 );
 113     lua_pop( p_state, i );
 114     i_read = stream_Read( p_demux->s, &p_read, n );
 115     lua_pushlstring( p_state, (const char *)p_read, i_read );
 116     return 1;
 117 }
 118
 119 static int vlclua_readline( lua_State *p_state )
 120 {
 121     demux_t *p_demux = vlclua_get_demux( p_state );
 122     char *psz_line = stream_ReadLine( p_demux->s );
 123     if( psz_line )
 124     {
 125         lua_pushstring( p_state, psz_line );
 126         free( psz_line );
 127     }
 128     else
 129     {
 130         lua_pushnil( p_state );
 131     }
 132     return 1;
 133 }
 134
 135 static int vlclua_decode_uri( lua_State *p_state )
 136 {
 137     int i = lua_gettop( p_state );
 138     if( !i ) return 0;
 139     const char *psz_cstring = lua_tostring( p_state, 1 );
 140     if( !psz_cstring ) return 0;
 141     char *psz_string = strdup( psz_cstring );
 142     lua_pop( p_state, i );
 143     decode_URI( psz_string );
 144     lua_pushstring( p_state, psz_string );
 145     free( psz_string );
 146     return 1;
 147 }
 148
 149 static int vlclua_resolve_xml_special_chars( lua_State *p_state )
 150 {
 151     int i = lua_gettop( p_state );
 152     if( !i ) return 0;
 153     const char *psz_cstring = lua_tostring( p_state, 1 );
 154     if( !psz_cstring ) return 0;
 155     char *psz_string = strdup( psz_cstring );
 156     lua_pop( p_state, i );
 157     resolve_xml_special_chars( psz_string );
 158     lua_pushstring( p_state, psz_string );
 159     free( psz_string );
 160     return 1;
 161 }
 162
 163 static int vlclua_msg_dbg( lua_State *p_state )
 164 {
 165     demux_t *p_demux = vlclua_get_demux( p_state );
 166     int i = lua_gettop( p_state );
 167     if( !i ) return 0;
 168     const char *psz_cstring = lua_tostring( p_state, 1 );
 169     if( !psz_cstring ) return 0;
 170     msg_Dbg( p_demux, "%s: %s", p_demux->p_sys->psz_filename, psz_cstring );
 171     return 0;
 172 }
 173 static int vlclua_msg_warn( lua_State *p_state )
 174 {
 175     demux_t *p_demux = vlclua_get_demux( p_state );
 176     int i = lua_gettop( p_state );
 177     if( !i ) return 0;
 178     const char *psz_cstring = lua_tostring( p_state, 1 );
 179     if( !psz_cstring ) return 0;
 180     msg_Warn( p_demux, "%s: %s", p_demux->p_sys->psz_filename, psz_cstring );
 181     return 0;
 182 }
 183 static int vlclua_msg_err( lua_State *p_state )
 184 {
 185     demux_t *p_demux = vlclua_get_demux( p_state );
 186     int i = lua_gettop( p_state );
 187     if( !i ) return 0;
 188     const char *psz_cstring = lua_tostring( p_state, 1 );
 189     if( !psz_cstring ) return 0;
 190     msg_Err( p_demux, "%s: %s", p_demux->p_sys->psz_filename, psz_cstring );
 191     return 0;
 192 }
 193 static int vlclua_msg_info( lua_State *p_state )
 194 {
 195     demux_t *p_demux = vlclua_get_demux( p_state );
 196     int i = lua_gettop( p_state );
 197     if( !i ) return 0;
 198     const char *psz_cstring = lua_tostring( p_state, 1 );
 199     if( !psz_cstring ) return 0;
 200     msg_Info( p_demux, "%s: %s", p_demux->p_sys->psz_filename, psz_cstring );
 201     return 0;
 202 }
 203
 204 /* Functions to register */
 205 static luaL_Reg p_reg[] =
 206 {
 207     { "peek", vlclua_peek },
 208     { "decode_uri", vlclua_decode_uri },
 209     { "resolve_xml_special_chars", vlclua_resolve_xml_special_chars },
 210     { "msg_dbg", vlclua_msg_dbg },
 211     { "msg_warn", vlclua_msg_warn },
 212     { "msg_err", vlclua_msg_err },
 213     { "msg_info", vlclua_msg_info },
 214     { NULL, NULL }
 215 };
 216
 217 /* Functions to register for parse() function call only */
 218 static luaL_Reg p_reg_parse[] =
 219 {
 220     { "read", vlclua_read },
 221     { "readline", vlclua_readline },
 222     { NULL, NULL }
 223 };
 224
 225 /*****************************************************************************
 226  *
 227  *****************************************************************************/
 228 static int file_select( const char *file )
 229 {
 230     int i = strlen( file );
 231     return i > 4 && !strcmp( file+i-4, ".lua" );
 232 }
 233
 234 static int file_compare( const char **a, const char **b )
 235 {
 236     return strcmp( *a, *b );
 237 }
 238
 239 /*****************************************************************************
 240  * Import_LuaPlaylist: main import function
 241  *****************************************************************************/
 242 int E_(Import_LuaPlaylist)( vlc_object_t *p_this )
 243 {
 244     demux_t *p_demux = (demux_t *)p_this;
 245     lua_State *p_state;
 246     int i_ret = VLC_EGENERIC;
 247
 248     char  *psz_filename  = NULL;
 249
 250     DIR   *dir           = NULL;
 251     char **ppsz_filelist = NULL;
 252     char **ppsz_fileend  = NULL;
 253     char **ppsz_file;
 254
 255     char  *ppsz_dir_list[] = { NULL, NULL, NULL };
 256     char **ppsz_dir;
 257
 258     p_demux->p_sys = (demux_sys_t*)malloc( sizeof( demux_sys_t ) );
 259     if( !p_demux->p_sys )
 260     {
 261         return VLC_ENOMEM;
 262     }
 263
 264     p_demux->p_sys->psz_filename = NULL;
 265
 266     p_demux->pf_control = Control;
 267     p_demux->pf_demux = Demux;
 268
 269     /* Initialise Lua state structure */
 270     p_state = luaL_newstate();
 271     if( !p_state )
 272     {
 273         msg_Err( p_demux, "Could not create new Lua State" );
 274         free( p_demux->p_sys );
 275         return VLC_EGENERIC;
 276     }
 277     p_demux->p_sys->p_state = p_state;
 278
 279     /* Load Lua libraries */
 280     luaL_openlibs( p_state ); /* FIXME: Don't open all the libs? */
 281
 282     luaL_register( p_state, "vlc", p_reg );
 283     lua_pushlightuserdata( p_state, p_demux );
 284     lua_setfield( p_state, lua_gettop( p_state ) - 1, "private" );
 285     lua_pushstring( p_state, p_demux->psz_path );
 286     lua_setfield( p_state, lua_gettop( p_state ) - 1, "path" );
 287     lua_pushstring( p_state, p_demux->psz_access );
 288     lua_setfield( p_state, lua_gettop( p_state ) - 1, "access" );
 289
 290     lua_pop( p_state, 1 );
 291
 292     ppsz_dir_list[0] = malloc( strlen( p_demux->p_libvlc->psz_homedir )
 293                              + strlen( "/"CONFIG_DIR"/luaplaylist" ) + 1 );
 294     sprintf( ppsz_dir_list[0], "%s/"CONFIG_DIR"/luaplaylist",
 295              p_demux->p_libvlc->psz_homedir );
 296
 297 #   if defined(__APPLE__) || defined(SYS_BEOS) || defined(WIN32)
 298     {
 299         char *psz_vlcpath = vlc_path( p_demux );
 300         ppsz_dir_list[1] = malloc( strlen( psz_vlcpath ) + strlen( "/share/luaplaylist" ) + 1 );
 301         if( !ppsz_dir_list[1] ) return VLC_ENOMEM;
 302 #       if defined( WIN32 )
 303             sprintf( ppsz_dir_list[1], "%s/luaplaylist", psz_vlcpath );
 304 #       else
 305             sprintf( ppsz_dir_list[1], "%s/share/luaplaylist", psz_vlcpath );
 306 #       endif
 307     }
 308 #   else
 309     {
 310 #   ifdef HAVE_SYS_STAT_H
 311         struct stat stat_info;
 312         if( ( utf8_stat( "share/luaplaylist", &stat_info ) == -1 )
 313             || !S_ISDIR( stat_info.st_mode ) )
 314         {
 315             ppsz_dir_list[1] = strdup( DATA_PATH "/luaplaylist" );
 316         }
 317         else
 318 #   endif
 319         {
 320             ppsz_dir_list[1] = strdup( "share/luaplaylist" );
 321         }
 322     }
 323 #   endif
 324
 325     for( ppsz_dir = ppsz_dir_list; *ppsz_dir; ppsz_dir++ )
 326     {
 327         int i_files;
 328
 329         if( ppsz_filelist )
 330         {
 331             for( ppsz_file = ppsz_filelist; ppsz_file < ppsz_fileend;
 332                  ppsz_file++ )
 333                 free( *ppsz_file );
 334             free( ppsz_filelist );
 335             ppsz_filelist = NULL;
 336         }
 337
 338         if( dir )
 339         {
 340             closedir( dir );
 341         }
 342
 343         msg_Dbg( p_demux, "Trying Lua scripts in %s", *ppsz_dir );
 344         dir = utf8_opendir( *ppsz_dir );
 345
 346         if( !dir ) continue;
 347         i_files = utf8_loaddir( dir, &ppsz_filelist, file_select, file_compare );
 348         if( i_files < 1 ) continue;
 349         ppsz_fileend = ppsz_filelist + i_files;
 350
 351         for( ppsz_file = ppsz_filelist; ppsz_file < ppsz_fileend; ppsz_file++ )
 352         {
 353             free( psz_filename ); psz_filename = NULL;
 354             asprintf( &psz_filename, "%s/%s", *ppsz_dir, *ppsz_file );
 355             msg_Dbg( p_demux, "Trying Lua playlist script %s", psz_filename );
 356             p_demux->p_sys->psz_filename = psz_filename;
 357
 358             /* Ugly hack to delete previous versions of the probe() and parse()
 359              * functions. */
 360             lua_pushnil( p_state );
 361             lua_pushnil( p_state );
 362             lua_setglobal( p_state, "probe" );
 363             lua_setglobal( p_state, "parse" );
 364
 365             /* Load and run the script(s) */
 366             if( luaL_dofile( p_state, psz_filename ) )
 367             {
 368                 msg_Warn( p_demux, "Error loading script %s: %s", psz_filename,
 369                           lua_tostring( p_state, lua_gettop( p_state ) ) );
 370                 lua_pop( p_state, 1 );
 371                 continue;
 372             }
 373
 374             lua_getglobal( p_state, "probe" );
 375
 376             if( !lua_isfunction( p_state, lua_gettop( p_state ) ) )
 377             {
 378                 msg_Warn( p_demux, "Error while runing script %s, "
 379                           "function probe() not found", psz_filename );
 380                 lua_pop( p_state, 1 );
 381                 continue;
 382             }
 383
 384             if( lua_pcall( p_state, 0, 1, 0 ) )
 385             {
 386                 msg_Warn( p_demux, "Error while runing script %s, "
 387                           "function probe(): %s", psz_filename,
 388                           lua_tostring( p_state, lua_gettop( p_state ) ) );
 389                 lua_pop( p_state, 1 );
 390                 continue;
 391             }
 392
 393             if( lua_gettop( p_state ) )
 394             {
 395                 if( lua_toboolean( p_state, 1 ) )
 396                 {
 397                     msg_Dbg( p_demux, "Lua playlist script %s's "
 398                              "probe() function was successful", psz_filename );
 399                     i_ret = VLC_SUCCESS;
 400                 }
 401                 lua_pop( p_state, 1 );
 402
 403                 if( i_ret == VLC_SUCCESS ) break;
 404             }
 405         }
 406         if( i_ret == VLC_SUCCESS ) break;
 407     }
 408
 409     if( ppsz_filelist )
 410     {
 411         for( ppsz_file = ppsz_filelist; ppsz_file < ppsz_fileend;
 412              ppsz_file++ )
 413             free( *ppsz_file );
 414         free( ppsz_filelist );
 415     }
 416     for( ppsz_dir = ppsz_dir_list; *ppsz_dir; ppsz_dir++ )
 417         free( *ppsz_dir );
 418
 419     if( dir ) closedir( dir );
 420     if( i_ret != VLC_SUCCESS )
 421         E_(Close_LuaPlaylist)( p_this );
 422     return i_ret;
 423 }
 424
 425 /*****************************************************************************
 426  * Deactivate: frees unused data
 427  *****************************************************************************/
 428 void E_(Close_LuaPlaylist)( vlc_object_t *p_this )
 429 {
 430     demux_t *p_demux = (demux_t *)p_this;
 431     lua_close( p_demux->p_sys->p_state );
 432     free( p_demux->p_sys->psz_filename );
 433     free( p_demux->p_sys );
 434 }
 435
 436 static int Demux( demux_t *p_demux )
 437 {
 438     input_item_t *p_input;
 439     lua_State *p_state = p_demux->p_sys->p_state;
 440     char *psz_filename = p_demux->p_sys->psz_filename;
 441     int t;
 442
 443     INIT_PLAYLIST_STUFF;
 444
 445     luaL_register( p_state, "vlc", p_reg_parse );
 446
 447     lua_getglobal( p_state, "parse" );
 448
 449     if( !lua_isfunction( p_state, lua_gettop( p_state ) ) )
 450     {
 451         msg_Warn( p_demux, "Error while runing script %s, "
 452                   "function parse() not found", psz_filename );
 453         E_(Close_LuaPlaylist)( VLC_OBJECT( p_demux ) );
 454         return VLC_EGENERIC;
 455     }
 456
 457     if( lua_pcall( p_state, 0, 1, 0 ) )
 458     {
 459         msg_Warn( p_demux, "Error while runing script %s, "
 460                   "function parse(): %s", psz_filename,
 461                   lua_tostring( p_state, lua_gettop( p_state ) ) );
 462         E_(Close_LuaPlaylist)( VLC_OBJECT( p_demux ) );
 463         return VLC_EGENERIC;
 464     }
 465
 466     /* Check that the Lua stack is big enough and grow it if needed.
 467      * Should be ok since LUA_MINSTACK is 20 but we never know. */
 468     lua_checkstack( p_state, 7 );
 469
 470     if( ( t = lua_gettop( p_state ) ) )
 471     {
 472
 473         if( lua_istable( p_state, t ) )
 474         {
 475             lua_pushnil( p_state );
 476             while( lua_next( p_state, t ) )
 477             {
 478                 if( lua_istable( p_state, t+2 ) )
 479                 {
 480                     lua_getfield( p_state, t+2, "path" );
 481                     if( lua_isstring( p_state, t+3 ) )
 482                     {
 483                         const char  *psz_path     = NULL;
 484                         const char  *psz_name     = NULL;
 485                         char       **ppsz_options = NULL;
 486                         int          i_options    = 0;
 487                         mtime_t      i_duration   = -1;
 488
 489                         /* Read path and name */
 490                         psz_path = lua_tostring( p_state, t+3 );
 491                         msg_Dbg( p_demux, "Path: %s", psz_path );
 492                         lua_getfield( p_state, t+2, "name" );
 493                         if( lua_isstring( p_state, t+4 ) )
 494                         {
 495                             psz_name = lua_tostring( p_state, t+4 );
 496                             msg_Dbg( p_demux, "Name: %s", psz_name );
 497                         }
 498                         else
 499                         {
 500                             psz_name = psz_path;
 501                         }
 502
 503                         /* Read duration */
 504                         lua_getfield( p_state, t+2, "duration" );
 505                         if( lua_isnumber( p_state, t+5 ) )
 506                         {
 507                             i_duration = (mtime_t)lua_tointeger( p_state, t+5 );
 508                             i_duration *= 1000000;
 509                         }
 510                         lua_pop( p_state, 1 ); /* pop "duration" */
 511
 512                         /* Read options */
 513                         lua_getfield( p_state, t+2, "options" );
 514                         if( lua_istable( p_state, t+5 ) )
 515                         {
 516                             lua_pushnil( p_state );
 517                             while( lua_next( p_state, t+5 ) )
 518                             {
 519                                 if( lua_isstring( p_state, t+7 ) )
 520                                 {
 521                                     char *psz_option = strdup(
 522                                         lua_tostring( p_state, t+7 ) );
 523                                     msg_Dbg( p_demux, "Option: %s",
 524                                              psz_option );
 525                                     INSERT_ELEM( ppsz_options, i_options,
 526                                                  i_options, psz_option );
 527                                 }
 528                                 else
 529                                 {
 530                                     msg_Warn( p_demux,
 531                                               "Option should be a string" );
 532                                 }
 533                                 lua_pop( p_state, 1 ); /* pop option */
 534                             }
 535                         }
 536                         lua_pop( p_state, 1 ); /* pop "options" */
 537
 538                         /* Create input item */
 539                         p_input = input_ItemNewExt( p_playlist, psz_path,
 540                                                     psz_name, i_options,
 541                                                     (const char **)ppsz_options,
 542                                                     i_duration );
 543                         lua_pop( p_state, 1 ); /* pop "name" */
 544
 545                         /* Read meta data */
 546                         p_input->p_meta = vlc_meta_New();
 547 #define TRY_META( a, b )                                                     \
 548                         lua_getfield( p_state, t+2, a );                     \
 549                         if( lua_isstring( p_state, t+4 ) )                   \
 550                         {                                                    \
 551                             psz_name = lua_tostring( p_state, t+4 );         \
 552                             msg_Dbg( p_demux, #b ": %s", psz_name );         \
 553                             vlc_meta_Set ## b ( p_input->p_meta, psz_name ); \
 554                         }                                                    \
 555                         lua_pop( p_state, 1 ); /* pop a */
 556                         TRY_META( "title", Title );
 557                         TRY_META( "artist", Artist );
 558                         TRY_META( "genre", Genre );
 559                         TRY_META( "copyright", Copyright );
 560                         TRY_META( "album", Album );
 561                         TRY_META( "tracknum", Tracknum );
 562                         TRY_META( "description", Description );
 563                         TRY_META( "rating", Rating );
 564                         TRY_META( "date", Date );
 565                         TRY_META( "setting", Setting );
 566                         TRY_META( "url", URL );
 567                         TRY_META( "language", Language );
 568                         TRY_META( "nowplaying", NowPlaying );
 569                         TRY_META( "publisher", Publisher );
 570                         TRY_META( "encodedby", EncodedBy );
 571                         TRY_META( "arturl", ArtURL );
 572                         TRY_META( "trackid", TrackID );
 573
 574                         /* Append item to playlist */
 575                         playlist_BothAddInput(
 576                             p_playlist, p_input,
 577                             p_item_in_category,
 578                             PLAYLIST_APPEND | PLAYLIST_SPREPARSE,
 579                             PLAYLIST_END, NULL, NULL, VLC_FALSE );
 580
 581                         while( i_options > 0 )
 582                             free( ppsz_options[--i_options] );
 583                         free( ppsz_options );
 584                     }
 585                     else
 586                     {
 587                         msg_Warn( p_demux,
 588                                  "Playlist item's path should be a string" );
 589                     }
 590                     lua_pop( p_state, 1 ); /* pop "path" */
 591                 }
 592                 else
 593                 {
 594                     msg_Warn( p_demux, "Playlist item should be a table" );
 595                 }
 596                 lua_pop( p_state, 1 ); /* pop the value, keep the key for
 597                                         * the next lua_next() call */
 598             }
 599         }
 600         else
 601         {
 602             msg_Warn( p_demux, "Script didn't return a table" );
 603         }
 604     }
 605     else
 606     {
 607         msg_Err( p_demux, "Script went completely foobar" );
 608     }
 609
 610     HANDLE_PLAY_AND_RELEASE;
 611
 612     return -1; /* Needed for correct operation of go back */
 613 }
 614
 615 static int Control( demux_t *p_demux, int i_query, va_list args )
 616 {
 617     return VLC_EGENERIC;
 618 }