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

   1 /*******************************************************************************
   2  * xspf.c : XSPF playlist import functions
   3  *******************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Daniel Stränger <vlc at schmaller dot de>
   8  *          Yoann Peronneau <yoann@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  ******************************************************************************/
  24 /**
  25  * \file modules/demux/playlist/xspf.c
  26  * \brief XSPF playlist import functions
  27  */
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_demux.h>
  35
  36 #include <vlc_xml.h>
  37 #include <vlc_strings.h>
  38 #include <vlc_url.h>
  39 #include "xspf.h"
  40 #include "playlist.h"
  41
  42 struct demux_sys_t
  43 {
  44     input_item_t **pp_tracklist;
  45     int i_tracklist_entries;
  46     int i_track_id;
  47     char * psz_base;
  48 };
  49
  50 static int Control( demux_t *, int, va_list );
  51 static int Demux( demux_t * );
  52
  53 /**
  54  * \brief XSPF submodule initialization function
  55  */
  56 int Import_xspf( vlc_object_t *p_this )
  57 {
  58     DEMUX_BY_EXTENSION_OR_FORCED_MSG( ".xspf", "xspf-open",
  59                                       "using XSPF playlist reader" );
  60     return VLC_SUCCESS;
  61 }
  62
  63 void Close_xspf( vlc_object_t *p_this )
  64 {
  65     demux_t *p_demux = (demux_t *)p_this;
  66     int i;
  67     for(i = 0; i < p_demux->p_sys->i_tracklist_entries; i++)
  68     {
  69         if(p_demux->p_sys->pp_tracklist[i])
  70             vlc_gc_decref( p_demux->p_sys->pp_tracklist[i] );
  71     }
  72     free( p_demux->p_sys->pp_tracklist );
  73     free( p_demux->p_sys->psz_base );
  74     free( p_demux->p_sys );
  75 }
  76
  77 /**
  78  * \brief demuxer function for XSPF parsing
  79  */
  80 int Demux( demux_t *p_demux )
  81 {
  82     int i_ret = 1;
  83     xml_t *p_xml = NULL;
  84     xml_reader_t *p_xml_reader = NULL;
  85     char *psz_name = NULL;
  86     INIT_PLAYLIST_STUFF;
  87     p_demux->p_sys->pp_tracklist = NULL;
  88     p_demux->p_sys->i_tracklist_entries = 0;
  89     p_demux->p_sys->i_track_id = -1;
  90     p_demux->p_sys->psz_base = NULL;
  91
  92     /* create new xml parser from stream */
  93     p_xml = xml_Create( p_demux );
  94     if( !p_xml )
  95         i_ret = -1;
  96     else
  97     {
  98         p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  99         if( !p_xml_reader )
 100             i_ret = -1;
 101     }
 102
 103     /* locating the root node */
 104     if( i_ret == 1 )
 105     {
 106         do
 107         {
 108             if( xml_ReaderRead( p_xml_reader ) != 1 )
 109             {
 110                 msg_Err( p_demux, "can't read xml stream" );
 111                 i_ret = -1;
 112             }
 113         } while( i_ret == VLC_SUCCESS &&
 114                  xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
 115     }
 116     /* checking root node name */
 117     if( i_ret == 1 )
 118     {
 119         psz_name = xml_ReaderName( p_xml_reader );
 120         if( !psz_name || strcmp( psz_name, "playlist" ) )
 121         {
 122             msg_Err( p_demux, "invalid root node name: %s", psz_name );
 123             i_ret = -1;
 124         }
 125         FREE_NAME();
 126     }
 127
 128     if( i_ret == 1 )
 129         i_ret = parse_playlist_node( p_demux, p_current_input,
 130                                      p_xml_reader, "playlist" ) ? 0 : -1;
 131
 132     int i;
 133     for( i = 0 ; i < p_demux->p_sys->i_tracklist_entries ; i++ )
 134     {
 135         input_item_t *p_new_input = p_demux->p_sys->pp_tracklist[i];
 136         if( p_new_input )
 137         {
 138             input_item_AddSubItem( p_current_input, p_new_input );
 139         }
 140     }
 141
 142     HANDLE_PLAY_AND_RELEASE;
 143     if( p_xml_reader )
 144         xml_ReaderDelete( p_xml, p_xml_reader );
 145     if( p_xml )
 146         xml_Delete( p_xml );
 147     return i_ret; /* Needed for correct operation of go back */
 148 }
 149
 150 /** \brief dummy function for demux callback interface */
 151 static int Control( demux_t *p_demux, int i_query, va_list args )
 152 {
 153     VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
 154     return VLC_EGENERIC;
 155 }
 156
 157 /**
 158  * \brief parse the root node of a XSPF playlist
 159  * \param p_demux demuxer instance
 160  * \param p_input_item current input item
 161  * \param p_xml_reader xml reader instance
 162  * \param psz_element name of element to parse
 163  */
 164 static bool parse_playlist_node COMPLEX_INTERFACE
 165 {
 166     char *psz_name = NULL;
 167     char *psz_value = NULL;
 168     bool b_version_found = false;
 169     int i_node;
 170     xml_elem_hnd_t *p_handler = NULL;
 171
 172     xml_elem_hnd_t pl_elements[] =
 173         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 174           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 175           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 176           {"info",         SIMPLE_CONTENT,  {NULL} },
 177           {"location",     SIMPLE_CONTENT,  {NULL} },
 178           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 179           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 180           {"date",         SIMPLE_CONTENT,  {NULL} },
 181           {"license",      SIMPLE_CONTENT,  {NULL} },
 182           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 183           {"link",         SIMPLE_CONTENT,  {NULL} },
 184           {"meta",         SIMPLE_CONTENT,  {NULL} },
 185           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 186           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 187           {NULL,           UNKNOWN_CONTENT, {NULL} }
 188         };
 189
 190     /* read all playlist attributes */
 191     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 192     {
 193         psz_name = xml_ReaderName( p_xml_reader );
 194         psz_value = xml_ReaderValue( p_xml_reader );
 195         if( !psz_name || !psz_value )
 196         {
 197             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 198             FREE_ATT();
 199             return false;
 200         }
 201         /* attribute: version */
 202         if( !strcmp( psz_name, "version" ) )
 203         {
 204             b_version_found = true;
 205             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 206                 msg_Warn( p_demux, "unsupported XSPF version" );
 207         }
 208         /* attribute: xmlns */
 209         else if( !strcmp( psz_name, "xmlns" ) || !strcmp( psz_name, "xmlns:vlc" ) )
 210             ;
 211         else if( !strcmp( psz_name, "xml:base" ) )
 212         {
 213             p_demux->p_sys->psz_base = decode_URI_duplicate( psz_value );
 214         }
 215         /* unknown attribute */
 216         else
 217             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 218
 219         FREE_ATT();
 220     }
 221     /* attribute version is mandatory !!! */
 222     if( !b_version_found )
 223         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 224
 225     /* parse the child elements - we only take care of <trackList> */
 226     while( xml_ReaderRead( p_xml_reader ) == 1 )
 227     {
 228         i_node = xml_ReaderNodeType( p_xml_reader );
 229         switch( i_node )
 230         {
 231             case XML_READER_NONE:
 232                 break;
 233             case XML_READER_STARTELEM:
 234                 /*  element start tag  */
 235                 psz_name = xml_ReaderName( p_xml_reader );
 236                 if( !psz_name || !*psz_name )
 237                 {
 238                     msg_Err( p_demux, "invalid xml stream" );
 239                     FREE_ATT();
 240                     return false;
 241                 }
 242                 /* choose handler */
 243                 for( p_handler = pl_elements;
 244                      p_handler->name && strcmp( psz_name, p_handler->name );
 245                      p_handler++ );
 246                 if( !p_handler->name )
 247                 {
 248                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 249                     FREE_ATT();
 250                     return false;
 251                 }
 252                 FREE_NAME();
 253                 /* complex content is parsed in a separate function */
 254                 if( p_handler->type == COMPLEX_CONTENT )
 255                 {
 256                     if( p_handler->pf_handler.cmplx( p_demux,
 257                                                      p_input_item,
 258                                                      p_xml_reader,
 259                                                      p_handler->name ) )
 260                     {
 261                         p_handler = NULL;
 262                         FREE_ATT();
 263                     }
 264                     else
 265                     {
 266                         FREE_ATT();
 267                         return false;
 268                     }
 269                 }
 270                 break;
 271
 272             case XML_READER_TEXT:
 273                 /* simple element content */
 274                 FREE_ATT();
 275                 psz_value = xml_ReaderValue( p_xml_reader );
 276                 if( !psz_value )
 277                 {
 278                     msg_Err( p_demux, "invalid xml stream" );
 279                     FREE_ATT();
 280                     return false;
 281                 }
 282                 break;
 283
 284             case XML_READER_ENDELEM:
 285                 /* element end tag */
 286                 psz_name = xml_ReaderName( p_xml_reader );
 287                 if( !psz_name )
 288                 {
 289                     msg_Err( p_demux, "invalid xml stream" );
 290                     FREE_ATT();
 291                     return false;
 292                 }
 293                 /* leave if the current parent node <playlist> is terminated */
 294                 if( !strcmp( psz_name, psz_element ) )
 295                 {
 296                     FREE_ATT();
 297                     return true;
 298                 }
 299                 /* there MUST have been a start tag for that element name */
 300                 if( !p_handler || !p_handler->name
 301                     || strcmp( p_handler->name, psz_name ))
 302                 {
 303                     msg_Err( p_demux, "there's no open element left for <%s>",
 304                              psz_name );
 305                     FREE_ATT();
 306                     return false;
 307                 }
 308
 309                 if( p_handler->pf_handler.smpl )
 310                 {
 311                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 312                                                 psz_value );
 313                 }
 314                 FREE_ATT();
 315                 p_handler = NULL;
 316                 break;
 317
 318             default:
 319                 /* unknown/unexpected xml node */
 320                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 321                 FREE_ATT();
 322                 return false;
 323         }
 324         FREE_NAME();
 325     }
 326     return false;
 327 }
 328
 329 /**
 330  * \brief parses the tracklist node which only may contain <track>s
 331  */
 332 static bool parse_tracklist_node COMPLEX_INTERFACE
 333 {
 334     VLC_UNUSED(psz_element);
 335     char *psz_name = NULL;
 336     int i_node;
 337     int i_ntracks = 0;
 338
 339     /* now parse the <track>s */
 340     while( xml_ReaderRead( p_xml_reader ) == 1 )
 341     {
 342         i_node = xml_ReaderNodeType( p_xml_reader );
 343         if( i_node == XML_READER_STARTELEM )
 344         {
 345             psz_name = xml_ReaderName( p_xml_reader );
 346             if( !psz_name )
 347             {
 348                 msg_Err( p_demux, "unexpected end of xml data" );
 349                 FREE_NAME();
 350                 return false;
 351             }
 352             if( strcmp( psz_name, "track") )
 353             {
 354                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 355                          psz_name );
 356                 FREE_NAME();
 357                 return false;
 358             }
 359             FREE_NAME();
 360
 361             /* parse the track data in a separate function */
 362             if( parse_track_node( p_demux, p_input_item,
 363                                    p_xml_reader,"track" ) == true )
 364                 i_ntracks++;
 365         }
 366         else if( i_node == XML_READER_ENDELEM )
 367             break;
 368     }
 369
 370     /* the <trackList> has to be terminated */
 371     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 372     {
 373         msg_Err( p_demux, "there's a missing </trackList>" );
 374         FREE_NAME();
 375         return false;
 376     }
 377     psz_name = xml_ReaderName( p_xml_reader );
 378     if( !psz_name || strcmp( psz_name, "trackList" ) )
 379     {
 380         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 381         FREE_NAME();
 382         return false;
 383     }
 384     FREE_NAME();
 385
 386     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 387
 388     return true;
 389 }
 390
 391 /**
 392  * \brief parse one track element
 393  * \param COMPLEX_INTERFACE
 394  */
 395 static bool parse_track_node COMPLEX_INTERFACE
 396 {
 397     input_item_t *p_new_input = NULL;
 398     int i_node;
 399     char *psz_name = NULL;
 400     char *psz_value = NULL;
 401     xml_elem_hnd_t *p_handler = NULL;
 402
 403     xml_elem_hnd_t track_elements[] =
 404         { {"location",     SIMPLE_CONTENT,  {NULL} },
 405           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 406           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 407           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 408           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 409           {"info",         SIMPLE_CONTENT,  {NULL} },
 410           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 411           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 412           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 413           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 414           {"link",         SIMPLE_CONTENT,  {NULL} },
 415           {"meta",         SIMPLE_CONTENT,  {NULL} },
 416           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 417           {NULL,           UNKNOWN_CONTENT, {NULL} }
 418         };
 419
 420     /* reset i_track_id */
 421     p_demux->p_sys->i_track_id = -1;
 422
 423     while( xml_ReaderRead( p_xml_reader ) == 1 )
 424     {
 425         i_node = xml_ReaderNodeType( p_xml_reader );
 426         switch( i_node )
 427         {
 428             case XML_READER_NONE:
 429                 break;
 430
 431             case XML_READER_STARTELEM:
 432                 /*  element start tag  */
 433                 psz_name = xml_ReaderName( p_xml_reader );
 434                 if( !psz_name || !*psz_name )
 435                 {
 436                     msg_Err( p_demux, "invalid xml stream" );
 437                     FREE_ATT();
 438                     return false;
 439                 }
 440                 /* choose handler */
 441                 for( p_handler = track_elements;
 442                      p_handler->name && strcmp( psz_name, p_handler->name );
 443                      p_handler++ );
 444                 if( !p_handler->name )
 445                 {
 446                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 447                     FREE_ATT();
 448                     return false;
 449                 }
 450                 FREE_NAME();
 451                 /* complex content is parsed in a separate function */
 452                 if( p_handler->type == COMPLEX_CONTENT )
 453                 {
 454                     if( !p_new_input )
 455                     {
 456                         msg_Err( p_demux,
 457                                  "at <%s> level no new item has been allocated",
 458                                  p_handler->name );
 459                         FREE_ATT();
 460                         return false;
 461                     }
 462                     if( p_handler->pf_handler.cmplx( p_demux,
 463                                                      p_new_input,
 464                                                      p_xml_reader,
 465                                                      p_handler->name ) )
 466                     {
 467                         p_handler = NULL;
 468                         FREE_ATT();
 469                     }
 470                     else
 471                     {
 472                         FREE_ATT();
 473                         return false;
 474                     }
 475                 }
 476                 break;
 477
 478             case XML_READER_TEXT:
 479                 /* simple element content */
 480                 FREE_ATT();
 481                 psz_value = xml_ReaderValue( p_xml_reader );
 482                 if( !psz_value )
 483                 {
 484                     msg_Err( p_demux, "invalid xml stream" );
 485                     FREE_ATT();
 486                     return false;
 487                 }
 488                 break;
 489
 490             case XML_READER_ENDELEM:
 491                 /* element end tag */
 492                 psz_name = xml_ReaderName( p_xml_reader );
 493                 if( !psz_name )
 494                 {
 495                     msg_Err( p_demux, "invalid xml stream" );
 496                     FREE_ATT();
 497                     return false;
 498                 }
 499                 /* leave if the current parent node <track> is terminated */
 500                 if( !strcmp( psz_name, psz_element ) )
 501                 {
 502                     FREE_ATT();
 503
 504                     if( p_demux->p_sys->i_track_id < 0 )
 505                     {
 506                         if( p_new_input )
 507                         {
 508                             input_item_AddSubItem( p_input_item, p_new_input );
 509                             vlc_gc_decref( p_new_input );
 510                         }
 511                         return true;
 512                     }
 513
 514                     if( p_demux->p_sys->i_track_id >=
 515                            p_demux->p_sys->i_tracklist_entries )
 516                     {
 517                         input_item_t **pp;
 518                         pp = realloc( p_demux->p_sys->pp_tracklist,
 519                             (p_demux->p_sys->i_track_id + 1) * sizeof(*pp) );
 520                         if( !pp )
 521                             return false;
 522                         p_demux->p_sys->pp_tracklist = pp;
 523                         while( p_demux->p_sys->i_track_id >=
 524                                p_demux->p_sys->i_tracklist_entries )
 525                             pp[p_demux->p_sys->i_tracklist_entries++] = NULL;
 526                     }
 527
 528                     p_demux->p_sys->pp_tracklist[
 529                             p_demux->p_sys->i_track_id ] = p_new_input;
 530                     return true;
 531                 }
 532                 /* there MUST have been a start tag for that element name */
 533                 if( !p_handler || !p_handler->name
 534                     || strcmp( p_handler->name, psz_name ))
 535                 {
 536                     msg_Err( p_demux, "there's no open element left for <%s>",
 537                              psz_name );
 538                     FREE_ATT();
 539                     return false;
 540                 }
 541
 542                 /* special case: location */
 543                 if( !strcmp( p_handler->name, "location" ) )
 544                 {
 545                     char *psz_uri = NULL;
 546                     /* there MUST NOT be an item */
 547                     if( p_new_input )
 548                     {
 549                         msg_Err( p_demux, "item <%s> already created",
 550                                  psz_name );
 551                         FREE_ATT();
 552                         return false;
 553                     }
 554                     psz_uri = decode_URI_duplicate( psz_value );
 555
 556                     if( !psz_uri )
 557                     {
 558                         FREE_ATT();
 559                         return false;
 560                     }
 561
 562                     if( p_demux->p_sys->psz_base && !strstr( psz_uri, "://" ) )
 563                     {
 564                         char* psz_tmp;
 565                         if( asprintf( &psz_tmp, "%s%s", p_demux->p_sys->psz_base,
 566                                       psz_uri ) == -1 )
 567                         {
 568                             free( psz_uri );
 569                             FREE_ATT();
 570                             return NULL;
 571                         }
 572                         free( psz_uri );
 573                         psz_uri = psz_tmp;
 574                     }
 575                     p_new_input = input_item_NewExt( p_demux, psz_uri,
 576                                                         NULL, 0, NULL, -1 );
 577                     free( psz_uri );
 578                     input_item_CopyOptions( p_input_item, p_new_input );
 579                     psz_uri = NULL;
 580                     FREE_ATT();
 581                     p_handler = NULL;
 582                 }
 583                 else
 584                 {
 585                     /* there MUST be an item */
 586                     if( !p_new_input )
 587                     {
 588                         msg_Err( p_demux, "item not yet created at <%s>",
 589                                  psz_name );
 590                         FREE_ATT();
 591                         return false;
 592                     }
 593                     if( p_handler->pf_handler.smpl )
 594                     {
 595                         p_handler->pf_handler.smpl( p_new_input,
 596                                                     p_handler->name,
 597                                                     psz_value );
 598                         FREE_ATT();
 599                     }
 600                 }
 601                 FREE_ATT();
 602                 p_handler = NULL;
 603                 break;
 604
 605             default:
 606                 /* unknown/unexpected xml node */
 607                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 608                 FREE_ATT();
 609                 return false;
 610         }
 611         FREE_NAME();
 612     }
 613     msg_Err( p_demux, "unexpected end of xml data" );
 614     FREE_ATT();
 615     return false;
 616 }
 617
 618 /**
 619  * \brief handles the supported <track> sub-elements
 620  */
 621 static bool set_item_info SIMPLE_INTERFACE
 622 {
 623     /* exit if setting is impossible */
 624     if( !psz_name || !psz_value || !p_input )
 625         return false;
 626
 627
 628     /* re-convert xml special characters inside psz_value */
 629     resolve_xml_special_chars( psz_value );
 630
 631     /* handle each info element in a separate "if" clause */
 632     if( !strcmp( psz_name, "title" ) )
 633     {
 634         input_item_SetTitle( p_input, psz_value );
 635     }
 636     else if( !strcmp( psz_name, "creator" ) )
 637     {
 638         input_item_SetArtist( p_input, psz_value );
 639     }
 640     else if( !strcmp( psz_name, "album" ) )
 641     {
 642         input_item_SetAlbum( p_input, psz_value );
 643
 644     }
 645     else if( !strcmp( psz_name, "trackNum" ) )
 646     {
 647         input_item_SetTrackNum( p_input, psz_value );
 648     }
 649     else if( !strcmp( psz_name, "duration" ) )
 650     {
 651         long i_num = atol( psz_value );
 652         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 653     }
 654     else if( !strcmp( psz_name, "annotation" ) )
 655     {
 656         input_item_SetDescription( p_input, psz_value );
 657     }
 658     else if( !strcmp( psz_name, "image" ) )
 659     {
 660         char *psz_uri = decode_URI_duplicate( psz_value );
 661         input_item_SetArtURL( p_input, psz_uri );
 662         free( psz_uri );
 663     }
 664     return true;
 665 }
 666
 667 /**
 668  * \brief handles the <vlc:option> elements
 669  */
 670 static bool set_option SIMPLE_INTERFACE
 671 {
 672     /* exit if setting is impossible */
 673     if( !psz_name || !psz_value || !p_input )
 674         return false;
 675
 676     /* re-convert xml special characters inside psz_value */
 677     resolve_xml_special_chars( psz_value );
 678
 679     input_item_AddOpt( p_input, psz_value, 0 );
 680
 681     return true;
 682 }
 683
 684 /**
 685  * \brief parse the extension node of a XSPF playlist
 686  */
 687 static bool parse_extension_node COMPLEX_INTERFACE
 688 {
 689     char *psz_name = NULL;
 690     char *psz_value = NULL;
 691     char *psz_title = NULL;
 692     char *psz_application = NULL;
 693     int i_node;
 694     bool b_release_input_item = false;
 695     xml_elem_hnd_t *p_handler = NULL;
 696     input_item_t *p_new_input = NULL;
 697
 698     xml_elem_hnd_t pl_elements[] =
 699         { {"vlc:node",   COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 700           {"vlc:item",   COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 701           {"vlc:id",     SIMPLE_CONTENT, {NULL} },
 702           {"vlc:option", SIMPLE_CONTENT, {.smpl = set_option} },
 703           {NULL,    UNKNOWN_CONTENT, {NULL} }
 704         };
 705
 706     /* read all extension node attributes */
 707     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 708     {
 709         psz_name = xml_ReaderName( p_xml_reader );
 710         psz_value = xml_ReaderValue( p_xml_reader );
 711         if( !psz_name || !psz_value )
 712         {
 713             msg_Err( p_demux, "invalid xml stream @ <vlc:node>" );
 714             FREE_ATT();
 715             return false;
 716         }
 717         /* attribute: title */
 718         if( !strcmp( psz_name, "title" ) )
 719         {
 720             resolve_xml_special_chars( psz_value );
 721             psz_title = strdup( psz_value );
 722         }
 723         /* extension attribute: application */
 724         else if( !strcmp( psz_name, "application" ) )
 725         {
 726             psz_application = strdup( psz_value );
 727         }
 728         /* unknown attribute */
 729         else
 730             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element,
 731                       psz_name );
 732
 733         FREE_ATT();
 734     }
 735
 736     /* attribute title is mandatory except for <extension> */
 737     if( !strcmp( psz_element, "vlc:node" ) )
 738     {
 739         if( !psz_title )
 740         {
 741             msg_Warn( p_demux, "<vlc:node> requires \"title\" attribute" );
 742             return false;
 743         }
 744         p_new_input = input_item_NewWithType( VLC_OBJECT( p_demux ),
 745                           "vlc://nop", psz_title, 0, NULL, -1,
 746                           ITEM_TYPE_DIRECTORY );
 747         if( p_new_input )
 748         {
 749             input_item_AddSubItem( p_input_item, p_new_input );
 750             p_input_item = p_new_input;
 751             b_release_input_item = true;
 752         }
 753         free( psz_title );
 754     }
 755     else if( !strcmp( psz_element, "extension" ) )
 756     {
 757         if( !psz_application )
 758         {
 759             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 760             return false;
 761         }
 762         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 763         {
 764             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 765             free( psz_application );
 766             return false;
 767         }
 768     }
 769     free( psz_application );
 770
 771     /* parse the child elements */
 772     while( xml_ReaderRead( p_xml_reader ) == 1 )
 773     {
 774         i_node = xml_ReaderNodeType( p_xml_reader );
 775         switch( i_node )
 776         {
 777             case XML_READER_NONE:
 778                 break;
 779             case XML_READER_STARTELEM:
 780                 /*  element start tag  */
 781                 psz_name = xml_ReaderName( p_xml_reader );
 782                 if( !psz_name || !*psz_name )
 783                 {
 784                     msg_Err( p_demux, "invalid xml stream" );
 785                     FREE_ATT();
 786                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 787                     return false;
 788                 }
 789                 /* choose handler */
 790                 for( p_handler = pl_elements;
 791                      p_handler->name && strcmp( psz_name, p_handler->name );
 792                      p_handler++ );
 793                 if( !p_handler->name )
 794                 {
 795                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 796                     FREE_ATT();
 797                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 798                     return false;
 799                 }
 800                 FREE_NAME();
 801                 /* complex content is parsed in a separate function */
 802                 if( p_handler->type == COMPLEX_CONTENT )
 803                 {
 804                     if( p_handler->pf_handler.cmplx( p_demux,
 805                                                      p_input_item,
 806                                                      p_xml_reader,
 807                                                      p_handler->name ) )
 808                     {
 809                         p_handler = NULL;
 810                         FREE_ATT();
 811                     }
 812                     else
 813                     {
 814                         FREE_ATT();
 815                         if( b_release_input_item ) vlc_gc_decref( p_new_input );
 816                         return false;
 817                     }
 818                 }
 819                 break;
 820
 821             case XML_READER_TEXT:
 822                 /* simple element content */
 823                 FREE_ATT();
 824                 psz_value = xml_ReaderValue( p_xml_reader );
 825                 if( !psz_value )
 826                 {
 827                     msg_Err( p_demux, "invalid xml stream" );
 828                     FREE_ATT();
 829                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 830                     return false;
 831                 }
 832                 break;
 833
 834             case XML_READER_ENDELEM:
 835                 /* element end tag */
 836                 psz_name = xml_ReaderName( p_xml_reader );
 837                 if( !psz_name )
 838                 {
 839                     msg_Err( p_demux, "invalid xml stream" );
 840                     FREE_ATT();
 841                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 842                     return false;
 843                 }
 844                 /* leave if the current parent node is terminated */
 845                 if( !strcmp( psz_name, psz_element ) )
 846                 {
 847                     FREE_ATT();
 848                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 849                     return true;
 850                 }
 851                 /* there MUST have been a start tag for that element name */
 852                 if( !p_handler || !p_handler->name
 853                     || strcmp( p_handler->name, psz_name ))
 854                 {
 855                     msg_Err( p_demux, "there's no open element left for <%s>",
 856                              psz_name );
 857                     FREE_ATT();
 858                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 859                     return false;
 860                 }
 861
 862                 /* special tag <vlc:id> */
 863                 if( !strcmp( p_handler->name, "vlc:id" ) )
 864                 {
 865                     p_demux->p_sys->i_track_id = atoi( psz_value );
 866                 }
 867                 else if( p_handler->pf_handler.smpl )
 868                 {
 869                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 870                                                 psz_value );
 871                 }
 872                 FREE_ATT();
 873                 p_handler = NULL;
 874                 break;
 875
 876             default:
 877                 /* unknown/unexpected xml node */
 878                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 879                 FREE_ATT();
 880                 if( b_release_input_item ) vlc_gc_decref( p_new_input );
 881                 return false;
 882         }
 883         FREE_NAME();
 884     }
 885     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 886     return false;
 887 }
 888
 889 /**
 890  * \brief parse the extension item node of a XSPF playlist
 891  */
 892 static bool parse_extitem_node COMPLEX_INTERFACE
 893 {
 894     VLC_UNUSED(psz_element);
 895     input_item_t *p_new_input = NULL;
 896     char *psz_name = NULL;
 897     char *psz_value = NULL;
 898     int i_tid = -1;
 899
 900     /* read all extension item attributes */
 901     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 902     {
 903         psz_name = xml_ReaderName( p_xml_reader );
 904         psz_value = xml_ReaderValue( p_xml_reader );
 905         if( !psz_name || !psz_value )
 906         {
 907             msg_Err( p_demux, "invalid xml stream @ <vlc:item>" );
 908             FREE_ATT();
 909             return false;
 910         }
 911         /* attribute: href */
 912         if( !strcmp( psz_name, "tid" ) )
 913         {
 914             i_tid = atoi( psz_value );
 915         }
 916         /* unknown attribute */
 917         else
 918             msg_Warn( p_demux, "invalid <vlc:item> attribute:\"%s\"", psz_name);
 919
 920         FREE_ATT();
 921     }
 922
 923     /* attribute href is mandatory */
 924     if( i_tid < 0 )
 925     {
 926         msg_Warn( p_demux, "<vlc:item> requires \"tid\" attribute" );
 927         return false;
 928     }
 929
 930     if( i_tid >= p_demux->p_sys->i_tracklist_entries )
 931     {
 932         msg_Warn( p_demux, "invalid \"tid\" attribute" );
 933         return false;
 934     }
 935
 936     p_new_input = p_demux->p_sys->pp_tracklist[ i_tid ];
 937     if( p_new_input )
 938     {
 939         input_item_AddSubItem( p_input_item, p_new_input );
 940         vlc_gc_decref( p_new_input );
 941         p_demux->p_sys->pp_tracklist[i_tid] = NULL;
 942     }
 943
 944     /* kludge for #1293 - XTAG sends ENDELEM for self closing tag */
 945     /* (libxml sends NONE) */
 946     xml_ReaderRead( p_xml_reader );
 947
 948     return true;
 949 }
 950
 951 /**
 952  * \brief skips complex element content that we can't manage
 953  */
 954 static bool skip_element COMPLEX_INTERFACE
 955 {
 956     VLC_UNUSED(p_demux); VLC_UNUSED(p_input_item);
 957     char *psz_endname;
 958
 959     while( xml_ReaderRead( p_xml_reader ) == 1 )
 960     {
 961         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 962         {
 963             psz_endname = xml_ReaderName( p_xml_reader );
 964             if( !psz_endname )
 965                 return false;
 966             if( !strcmp( psz_element, psz_endname ) )
 967             {
 968                 free( psz_endname );
 969                 return true;
 970             }
 971             else
 972                 free( psz_endname );
 973         }
 974     }
 975     return false;
 976 }