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     demux_sys_t *p_sys = p_demux->p_sys;
  67     for( int i = 0; i < p_sys->i_tracklist_entries; i++ )
  68     {
  69         if( p_sys->pp_tracklist[i] )
  70             vlc_gc_decref( p_sys->pp_tracklist[i] );
  71     }
  72     free( p_sys->pp_tracklist );
  73     free( p_sys->psz_base );
  74     free( 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     input_item_t *p_current_input = GetCurrentItem(p_demux);
  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         goto end;
  96
  97     p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  98     if( !p_xml_reader )
  99         goto end;
 100
 101     /* locating the root node */
 102     do
 103     {
 104         if( xml_ReaderRead( p_xml_reader ) != 1 )
 105         {
 106             msg_Err( p_demux, "can't read xml stream" );
 107             goto end;
 108         }
 109     } while( xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
 110
 111     /* checking root node name */
 112     psz_name = xml_ReaderName( p_xml_reader );
 113     if( !psz_name || strcmp( psz_name, "playlist" ) )
 114     {
 115         msg_Err( p_demux, "invalid root node name: %s", psz_name );
 116         free( psz_name );
 117         goto end;
 118     }
 119     free( psz_name );
 120
 121     input_item_node_t *p_subitems =
 122         input_item_node_Create( p_current_input );
 123
 124     i_ret = parse_playlist_node( p_demux, p_subitems,
 125                                  p_xml_reader, "playlist" ) ? 0 : -1;
 126
 127     for( int i = 0 ; i < p_demux->p_sys->i_tracklist_entries ; i++ )
 128     {
 129         input_item_t *p_new_input = p_demux->p_sys->pp_tracklist[i];
 130         if( p_new_input )
 131         {
 132             input_item_AddSubItem( p_current_input, p_new_input );
 133             input_item_node_AppendItem( p_subitems, p_new_input );
 134         }
 135     }
 136
 137     input_item_AddSubItemTree( p_subitems );
 138     input_item_node_Delete( p_subitems );
 139
 140 end:
 141     vlc_gc_decref(p_current_input);
 142     if( p_xml_reader )
 143         xml_ReaderDelete( p_xml, p_xml_reader );
 144     if( p_xml )
 145         xml_Delete( p_xml );
 146     return i_ret; /* Needed for correct operation of go back */
 147 }
 148
 149 /** \brief dummy function for demux callback interface */
 150 static int Control( demux_t *p_demux, int i_query, va_list args )
 151 {
 152     VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
 153     return VLC_EGENERIC;
 154 }
 155
 156 /**
 157  * \brief parse the root node of a XSPF playlist
 158  * \param p_demux demuxer instance
 159  * \param p_input_item current input item
 160  * \param p_xml_reader xml reader instance
 161  * \param psz_element name of element to parse
 162  */
 163 static bool parse_playlist_node COMPLEX_INTERFACE
 164 {
 165     input_item_t *p_input_item = p_input_node->p_item;
 166     char *psz_name = NULL;
 167     char *psz_value = NULL;
 168     bool b_version_found = false;
 169     int i_node;
 170     bool b_ret = false;
 171     xml_elem_hnd_t *p_handler = NULL;
 172
 173     xml_elem_hnd_t pl_elements[] =
 174         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 175           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 176           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 177           {"info",         SIMPLE_CONTENT,  {NULL} },
 178           {"location",     SIMPLE_CONTENT,  {NULL} },
 179           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 180           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 181           {"date",         SIMPLE_CONTENT,  {NULL} },
 182           {"license",      SIMPLE_CONTENT,  {NULL} },
 183           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 184           {"link",         SIMPLE_CONTENT,  {NULL} },
 185           {"meta",         SIMPLE_CONTENT,  {NULL} },
 186           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 187           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 188           {NULL,           UNKNOWN_CONTENT, {NULL} }
 189         };
 190
 191     /* read all playlist attributes */
 192     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 193     {
 194         psz_name = xml_ReaderName( p_xml_reader );
 195         psz_value = xml_ReaderValue( p_xml_reader );
 196         if( !psz_name || !psz_value )
 197         {
 198             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 199             goto end;
 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 = strdup( psz_value );
 214         }
 215         /* unknown attribute */
 216         else
 217             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 218
 219         free( psz_name );
 220         free( psz_value );
 221     }
 222     /* attribute version is mandatory !!! */
 223     if( !b_version_found )
 224         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 225
 226     /* parse the child elements - we only take care of <trackList> */
 227     psz_name = NULL;
 228     psz_value = NULL;
 229     while( xml_ReaderRead( p_xml_reader ) == 1 )
 230     {
 231         i_node = xml_ReaderNodeType( p_xml_reader );
 232         switch( i_node )
 233         {
 234             case XML_READER_NONE:
 235                 break;
 236             case XML_READER_STARTELEM:
 237                 /*  element start tag  */
 238                 psz_name = xml_ReaderName( p_xml_reader );
 239                 if( !psz_name || !*psz_name )
 240                 {
 241                     msg_Err( p_demux, "invalid xml stream" );
 242                     goto end;
 243                 }
 244                 /* choose handler */
 245                 for( p_handler = pl_elements;
 246                      p_handler->name && strcmp( psz_name, p_handler->name );
 247                      p_handler++ );
 248                 if( !p_handler->name )
 249                 {
 250                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 251                     goto end;
 252                 }
 253                 FREE_NAME();
 254                 /* complex content is parsed in a separate function */
 255                 if( p_handler->type == COMPLEX_CONTENT )
 256                 {
 257                     FREE_VALUE();
 258                     if( p_handler->pf_handler.cmplx( p_demux,
 259                                                      p_input_node,
 260                                                      p_xml_reader,
 261                                                      p_handler->name ) )
 262                     {
 263                         p_handler = NULL;
 264                     }
 265                     else
 266                     {
 267                         return false;
 268                     }
 269                 }
 270                 break;
 271
 272             case XML_READER_TEXT:
 273                 /* simple element content */
 274                 free( psz_value );
 275                 psz_value = xml_ReaderValue( p_xml_reader );
 276                 if( !psz_value )
 277                 {
 278                     msg_Err( p_demux, "invalid xml stream" );
 279                     goto end;
 280                 }
 281                 break;
 282
 283             case XML_READER_ENDELEM:
 284                 /* element end tag */
 285                 psz_name = xml_ReaderName( p_xml_reader );
 286                 if( !psz_name )
 287                 {
 288                     msg_Err( p_demux, "invalid xml stream" );
 289                     goto end;
 290                 }
 291                 /* leave if the current parent node <playlist> is terminated */
 292                 if( !strcmp( psz_name, psz_element ) )
 293                 {
 294                     b_ret = true;
 295                     goto end;
 296                 }
 297                 /* there MUST have been a start tag for that element name */
 298                 if( !p_handler || !p_handler->name
 299                     || strcmp( p_handler->name, psz_name ))
 300                 {
 301                     msg_Err( p_demux, "there's no open element left for <%s>",
 302                              psz_name );
 303                     goto end;
 304                 }
 305
 306                 if( p_handler->pf_handler.smpl )
 307                 {
 308                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 309                                                 psz_value );
 310                 }
 311                 FREE_ATT();
 312                 p_handler = NULL;
 313                 break;
 314
 315             default:
 316                 /* unknown/unexpected xml node */
 317                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 318                 goto end;
 319         }
 320     }
 321
 322 end:
 323     free( psz_name );
 324     free( psz_value );
 325     return b_ret;
 326 }
 327
 328 /**
 329  * \brief parses the tracklist node which only may contain <track>s
 330  */
 331 static bool parse_tracklist_node COMPLEX_INTERFACE
 332 {
 333     VLC_UNUSED(psz_element);
 334     char *psz_name;
 335     int i_ntracks = 0;
 336
 337     /* now parse the <track>s */
 338     while( xml_ReaderRead( p_xml_reader ) == 1 )
 339     {
 340         int i_node = xml_ReaderNodeType( p_xml_reader );
 341         if( i_node == XML_READER_STARTELEM )
 342         {
 343             char *psz_eltname = xml_ReaderName( p_xml_reader );
 344             if( !psz_eltname )
 345             {
 346                 msg_Err( p_demux, "unexpected end of xml data" );
 347                 free( psz_eltname );
 348                 return false;
 349             }
 350             if( strcmp( psz_eltname, "track") )
 351             {
 352                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 353                          psz_eltname );
 354                 free( psz_eltname );
 355                 return false;
 356             }
 357             free( psz_eltname );
 358
 359             /* parse the track data in a separate function */
 360             if( parse_track_node( p_demux, p_input_node,
 361                                   p_xml_reader, "track" ) )
 362                 i_ntracks++;
 363         }
 364         else if( i_node == XML_READER_ENDELEM )
 365             break;
 366     }
 367
 368     /* the <trackList> has to be terminated */
 369     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 370     {
 371         msg_Err( p_demux, "there's a missing </trackList>" );
 372         return false;
 373     }
 374     psz_name = xml_ReaderName( p_xml_reader );
 375     if( !psz_name || strcmp( psz_name, "trackList" ) )
 376     {
 377         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 378         free( psz_name );
 379         return false;
 380     }
 381     free( psz_name );
 382
 383     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 384     return true;
 385 }
 386
 387 /**
 388  * \brief parse one track element
 389  * \param COMPLEX_INTERFACE
 390  */
 391 static bool parse_track_node COMPLEX_INTERFACE
 392 {
 393     input_item_t *p_input_item = p_input_node->p_item;
 394     char *psz_name = NULL;
 395     char *psz_value = NULL;
 396     xml_elem_hnd_t *p_handler = NULL;
 397     demux_sys_t *p_sys = p_demux->p_sys;
 398     bool b_ret = false;
 399
 400     xml_elem_hnd_t track_elements[] =
 401         { {"location",     SIMPLE_CONTENT,  {NULL} },
 402           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 403           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 404           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 405           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 406           {"info",         SIMPLE_CONTENT,  {NULL} },
 407           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 408           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 409           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 410           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 411           {"link",         SIMPLE_CONTENT,  {NULL} },
 412           {"meta",         SIMPLE_CONTENT,  {NULL} },
 413           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 414           {NULL,           UNKNOWN_CONTENT, {NULL} }
 415         };
 416
 417     input_item_t *p_new_input = input_item_New( p_demux, NULL, NULL );
 418     input_item_node_t *p_new_node = input_item_node_Create( p_new_input );
 419
 420     if( !p_new_input )
 421     {
 422         /* malloc has failed for input_item_New, so bailout early */
 423         return false;
 424     }
 425
 426     /* reset i_track_id */
 427     p_sys->i_track_id = -1;
 428
 429     while( xml_ReaderRead( p_xml_reader ) == 1 )
 430     {
 431         int i_node = xml_ReaderNodeType( p_xml_reader );
 432         switch( i_node )
 433         {
 434             case XML_READER_NONE:
 435                 break;
 436
 437             case XML_READER_STARTELEM:
 438                 /*  element start tag  */
 439                 psz_name = xml_ReaderName( p_xml_reader );
 440                 if( !psz_name || !*psz_name )
 441                 {
 442                     msg_Err( p_demux, "invalid xml stream" );
 443                     goto end;
 444                 }
 445                 /* choose handler */
 446                 for( p_handler = track_elements;
 447                      p_handler->name && strcmp( psz_name, p_handler->name );
 448                      p_handler++ );
 449                 if( !p_handler->name )
 450                 {
 451                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 452                     goto end;
 453                 }
 454                 FREE_NAME();
 455                 /* complex content is parsed in a separate function */
 456                 if( p_handler->type == COMPLEX_CONTENT )
 457                 {
 458                     FREE_VALUE();
 459
 460                     bool b_res = p_handler->pf_handler.cmplx( p_demux,
 461                                                         p_new_node,
 462                                                         p_xml_reader,
 463                                                         p_handler->name );
 464                     if( b_res )
 465                     {
 466                         p_handler = NULL;
 467                     }
 468                     else
 469                     {
 470                         return false;
 471                     }
 472                 }
 473                 break;
 474
 475             case XML_READER_TEXT:
 476                 /* simple element content */
 477                 free( psz_value );
 478                 psz_value = xml_ReaderValue( p_xml_reader );
 479                 if( !psz_value )
 480                 {
 481                     msg_Err( p_demux, "invalid xml stream" );
 482                     goto end;
 483                 }
 484                 break;
 485
 486             case XML_READER_ENDELEM:
 487                 /* element end tag */
 488                 psz_name = xml_ReaderName( p_xml_reader );
 489                 if( !psz_name )
 490                 {
 491                     msg_Err( p_demux, "invalid xml stream" );
 492                     goto end;
 493                 }
 494
 495                 /* leave if the current parent node <track> is terminated */
 496                 if( !strcmp( psz_name, psz_element ) )
 497                 {
 498                     free( psz_name );
 499                     free( psz_value );
 500
 501                     /* Make sure we have a URI */
 502                     char *psz_uri = input_item_GetURI( p_new_input );
 503                     if( !psz_uri )
 504                     {
 505                         input_item_SetURI( p_new_input, "vlc://nop" );
 506                     }
 507                     free( psz_uri );
 508
 509                     if( p_sys->i_track_id < 0 )
 510                     {
 511                         input_item_AddSubItem( p_input_item, p_new_input );
 512                         input_item_node_AppendNode( p_input_node, p_new_node );
 513                         vlc_gc_decref( p_new_input );
 514                         return true;
 515                     }
 516
 517                     if( p_sys->i_track_id >= p_sys->i_tracklist_entries )
 518                     {
 519                         input_item_t **pp;
 520                         pp = realloc( p_sys->pp_tracklist,
 521                             (p_sys->i_track_id + 1) * sizeof(*pp) );
 522                         if( !pp )
 523                             return false;
 524                         p_sys->pp_tracklist = pp;
 525                         while( p_sys->i_track_id >= p_sys->i_tracklist_entries )
 526                             pp[p_sys->i_tracklist_entries++] = NULL;
 527                     }
 528
 529                     p_sys->pp_tracklist[ 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                     goto end;
 539                 }
 540
 541                 /* special case: location */
 542                 if( !strcmp( p_handler->name, "location" ) )
 543                 {
 544                     /* FIXME: This is broken. Scheme-relative (//...) locations
 545                      * and anchors (#...) are not resolved correctly. Also,
 546                      * host-relative (/...) and directory-relative locations
 547                      * ("relative path" in vernacular) should be resolved.
 548                      * Last, psz_base should default to the XSPF resource
 549                      * location if missing (not the current working directory).
 550                      * -- Courmisch */
 551                     if( p_sys->psz_base && !strstr( psz_value, "://" ) )
 552                     {
 553                         char* psz_tmp;
 554                         if( asprintf( &psz_tmp, "%s%s", p_sys->psz_base,
 555                                       psz_value ) == -1 )
 556                         {
 557                             goto end;
 558                         }
 559                         input_item_SetURI( p_new_input, psz_tmp );
 560                         free( psz_tmp );
 561                     }
 562                     else
 563                         input_item_SetURI( p_new_input, psz_value );
 564                     input_item_CopyOptions( p_input_item, p_new_input );
 565                 }
 566                 else
 567                 {
 568                     /* there MUST be an item */
 569                     if( p_handler->pf_handler.smpl )
 570                     {
 571                         p_handler->pf_handler.smpl( p_new_input,
 572                                                     p_handler->name,
 573                                                     psz_value );
 574                         FREE_ATT();
 575                     }
 576                 }
 577                 FREE_ATT();
 578                 p_handler = NULL;
 579                 break;
 580
 581             default:
 582                 /* unknown/unexpected xml node */
 583                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 584                 goto end;
 585         }
 586     }
 587     msg_Err( p_demux, "unexpected end of xml data" );
 588
 589 end:
 590     free( psz_name );
 591     free( psz_value );
 592     return b_ret;
 593 }
 594
 595 /**
 596  * \brief handles the supported <track> sub-elements
 597  */
 598 static bool set_item_info SIMPLE_INTERFACE
 599 {
 600     /* exit if setting is impossible */
 601     if( !psz_name || !psz_value || !p_input )
 602         return false;
 603
 604     /* re-convert xml special characters inside psz_value */
 605     resolve_xml_special_chars( psz_value );
 606
 607     /* handle each info element in a separate "if" clause */
 608     if( !strcmp( psz_name, "title" ) )
 609     {
 610         input_item_SetTitle( p_input, psz_value );
 611     }
 612     else if( !strcmp( psz_name, "creator" ) )
 613     {
 614         input_item_SetArtist( p_input, psz_value );
 615     }
 616     else if( !strcmp( psz_name, "album" ) )
 617     {
 618         input_item_SetAlbum( p_input, psz_value );
 619
 620     }
 621     else if( !strcmp( psz_name, "trackNum" ) )
 622     {
 623         input_item_SetTrackNum( p_input, psz_value );
 624     }
 625     else if( !strcmp( psz_name, "duration" ) )
 626     {
 627         long i_num = atol( psz_value );
 628         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 629     }
 630     else if( !strcmp( psz_name, "annotation" ) )
 631     {
 632         input_item_SetDescription( p_input, psz_value );
 633     }
 634     else if( !strcmp( psz_name, "image" ) )
 635     {
 636         input_item_SetArtURL( p_input, psz_value );
 637     }
 638     return true;
 639 }
 640
 641 /**
 642  * \brief handles the <vlc:option> elements
 643  */
 644 static bool set_option SIMPLE_INTERFACE
 645 {
 646     /* exit if setting is impossible */
 647     if( !psz_name || !psz_value || !p_input )
 648         return false;
 649
 650     /* re-convert xml special characters inside psz_value */
 651     resolve_xml_special_chars( psz_value );
 652
 653     input_item_AddOption( p_input, psz_value, 0 );
 654
 655     return true;
 656 }
 657
 658 /**
 659  * \brief parse the extension node of a XSPF playlist
 660  */
 661 static bool parse_extension_node COMPLEX_INTERFACE
 662 {
 663     input_item_t *p_input_item = p_input_node->p_item;
 664     char *psz_name = NULL;
 665     char *psz_value = NULL;
 666     char *psz_title = NULL;
 667     char *psz_application = NULL;
 668     int i_node;
 669     bool b_release_input_item = false;
 670     xml_elem_hnd_t *p_handler = NULL;
 671     input_item_t *p_new_input = NULL;
 672
 673     xml_elem_hnd_t pl_elements[] =
 674         { {"vlc:node",   COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 675           {"vlc:item",   COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 676           {"vlc:id",     SIMPLE_CONTENT, {NULL} },
 677           {"vlc:option", SIMPLE_CONTENT, {.smpl = set_option} },
 678           {NULL,    UNKNOWN_CONTENT, {NULL} }
 679         };
 680
 681     /* read all extension node attributes */
 682     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 683     {
 684         psz_name = xml_ReaderName( p_xml_reader );
 685         psz_value = xml_ReaderValue( p_xml_reader );
 686         if( !psz_name || !psz_value )
 687         {
 688             msg_Err( p_demux, "invalid xml stream @ <vlc:node>" );
 689             FREE_ATT();
 690             return false;
 691         }
 692         /* attribute: title */
 693         if( !strcmp( psz_name, "title" ) )
 694         {
 695             resolve_xml_special_chars( psz_value );
 696             psz_title = psz_value;
 697         }
 698         /* extension attribute: application */
 699         else if( !strcmp( psz_name, "application" ) )
 700         {
 701             psz_application = psz_value;
 702         }
 703         /* unknown attribute */
 704         else
 705         {
 706             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element,
 707                       psz_name );
 708             FREE_VALUE();
 709         }
 710         FREE_NAME();
 711         psz_value = NULL;
 712     }
 713
 714     /* attribute title is mandatory except for <extension> */
 715     if( !strcmp( psz_element, "vlc:node" ) )
 716     {
 717         if( !psz_title )
 718         {
 719             msg_Warn( p_demux, "<vlc:node> requires \"title\" attribute" );
 720             return false;
 721         }
 722         p_new_input = input_item_NewWithType( VLC_OBJECT( p_demux ),
 723                           "vlc://nop", psz_title, 0, NULL, 0, -1,
 724                           ITEM_TYPE_DIRECTORY );
 725         if( p_new_input )
 726         {
 727             input_item_AddSubItem( p_input_item, p_new_input );
 728             p_input_node =
 729                 input_item_node_AppendItem( p_input_node, p_new_input );
 730             p_input_item = p_new_input;
 731             b_release_input_item = true;
 732         }
 733         free( psz_title );
 734     }
 735     else if( !strcmp( psz_element, "extension" ) )
 736     {
 737         if( !psz_application )
 738         {
 739             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 740             return false;
 741         }
 742         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 743         {
 744             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 745             free( psz_application );
 746             return false;
 747         }
 748     }
 749     free( psz_application );
 750
 751
 752     /* parse the child elements */
 753     while( xml_ReaderRead( p_xml_reader ) == 1 )
 754     {
 755         i_node = xml_ReaderNodeType( p_xml_reader );
 756         switch( i_node )
 757         {
 758             case XML_READER_NONE:
 759                 break;
 760             case XML_READER_STARTELEM:
 761                 /*  element start tag  */
 762                 psz_name = xml_ReaderName( p_xml_reader );
 763                 if( !psz_name || !*psz_name )
 764                 {
 765                     msg_Err( p_demux, "invalid xml stream" );
 766                     FREE_ATT();
 767                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 768                     return false;
 769                 }
 770                 /* choose handler */
 771                 for( p_handler = pl_elements;
 772                      p_handler->name && strcmp( psz_name, p_handler->name );
 773                      p_handler++ );
 774                 if( !p_handler->name )
 775                 {
 776                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 777                     FREE_ATT();
 778                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 779                     return false;
 780                 }
 781                 FREE_NAME();
 782                 /* complex content is parsed in a separate function */
 783                 if( p_handler->type == COMPLEX_CONTENT )
 784                 {
 785                     if( p_handler->pf_handler.cmplx( p_demux,
 786                                                      p_input_node,
 787                                                      p_xml_reader,
 788                                                      p_handler->name ) )
 789                     {
 790                         p_handler = NULL;
 791                         FREE_ATT();
 792                     }
 793                     else
 794                     {
 795                         FREE_ATT();
 796                         if( b_release_input_item ) vlc_gc_decref( p_new_input );
 797                         return false;
 798                     }
 799                 }
 800                 break;
 801
 802             case XML_READER_TEXT:
 803                 /* simple element content */
 804                 FREE_ATT();
 805                 psz_value = xml_ReaderValue( p_xml_reader );
 806                 if( !psz_value )
 807                 {
 808                     msg_Err( p_demux, "invalid xml stream" );
 809                     FREE_ATT();
 810                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 811                     return false;
 812                 }
 813                 break;
 814
 815             case XML_READER_ENDELEM:
 816                 /* element end tag */
 817                 psz_name = xml_ReaderName( p_xml_reader );
 818                 if( !psz_name )
 819                 {
 820                     msg_Err( p_demux, "invalid xml stream" );
 821                     FREE_ATT();
 822                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 823                     return false;
 824                 }
 825                 /* leave if the current parent node is terminated */
 826                 if( !strcmp( psz_name, psz_element ) )
 827                 {
 828                     FREE_ATT();
 829                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 830                     return true;
 831                 }
 832                 /* there MUST have been a start tag for that element name */
 833                 if( !p_handler || !p_handler->name
 834                     || strcmp( p_handler->name, psz_name ))
 835                 {
 836                     msg_Err( p_demux, "there's no open element left for <%s>",
 837                              psz_name );
 838                     FREE_ATT();
 839                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 840                     return false;
 841                 }
 842
 843                 /* special tag <vlc:id> */
 844                 if( !strcmp( p_handler->name, "vlc:id" ) )
 845                 {
 846                     p_demux->p_sys->i_track_id = atoi( psz_value );
 847                 }
 848                 else if( p_handler->pf_handler.smpl )
 849                 {
 850                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 851                                                 psz_value );
 852                 }
 853                 FREE_ATT();
 854                 p_handler = NULL;
 855                 break;
 856
 857             default:
 858                 /* unknown/unexpected xml node */
 859                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 860                 FREE_ATT();
 861                 if( b_release_input_item ) vlc_gc_decref( p_new_input );
 862                 return false;
 863         }
 864         FREE_NAME();
 865     }
 866     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 867     return false;
 868 }
 869
 870 /**
 871  * \brief parse the extension item node of a XSPF playlist
 872  */
 873 static bool parse_extitem_node COMPLEX_INTERFACE
 874 {
 875     VLC_UNUSED(psz_element);
 876     input_item_t *p_new_input = NULL;
 877     int i_tid = -1;
 878
 879     /* read all extension item attributes */
 880     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 881     {
 882         char *psz_name = xml_ReaderName( p_xml_reader );
 883         char *psz_value = xml_ReaderValue( p_xml_reader );
 884         if( !psz_name || !psz_value )
 885         {
 886             msg_Err( p_demux, "invalid xml stream @ <vlc:item>" );
 887             free( psz_name );
 888             free( psz_value );
 889             return false;
 890         }
 891         /* attribute: href */
 892         if( !strcmp( psz_name, "tid" ) )
 893         {
 894             i_tid = atoi( psz_value );
 895         }
 896         /* unknown attribute */
 897         else
 898             msg_Warn( p_demux, "invalid <vlc:item> attribute:\"%s\"", psz_name);
 899
 900         free( psz_name );
 901         free( psz_value );
 902     }
 903
 904     /* attribute href is mandatory */
 905     if( i_tid < 0 )
 906     {
 907         msg_Warn( p_demux, "<vlc:item> requires \"tid\" attribute" );
 908         return false;
 909     }
 910
 911     if( i_tid >= p_demux->p_sys->i_tracklist_entries )
 912     {
 913         msg_Warn( p_demux, "invalid \"tid\" attribute" );
 914         return false;
 915     }
 916
 917     p_new_input = p_demux->p_sys->pp_tracklist[ i_tid ];
 918     if( p_new_input )
 919     {
 920         input_item_AddSubItem( p_input_node->p_item, p_new_input );
 921         input_item_node_AppendItem( p_input_node, p_new_input );
 922         vlc_gc_decref( p_new_input );
 923         p_demux->p_sys->pp_tracklist[i_tid] = NULL;
 924     }
 925
 926     /* kludge for #1293 - XTAG sends ENDELEM for self closing tag */
 927     /* (libxml sends NONE) */
 928     xml_ReaderRead( p_xml_reader );
 929
 930     return true;
 931 }
 932
 933 /**
 934  * \brief skips complex element content that we can't manage
 935  */
 936 static bool skip_element COMPLEX_INTERFACE
 937 {
 938     VLC_UNUSED(p_demux); VLC_UNUSED(p_input_node);
 939
 940     while( xml_ReaderRead( p_xml_reader ) == 1 )
 941     {
 942         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 943         {
 944             char *psz_endname = xml_ReaderName( p_xml_reader );
 945             if( !psz_endname )
 946                 return false;
 947             if( !strcmp( psz_element, psz_endname ) )
 948             {
 949                 free( psz_endname );
 950                 return true;
 951             }
 952             else
 953                 free( psz_endname );
 954         }
 955     }
 956     return false;
 957 }