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_reader_t *p_xml_reader = NULL;
  84     char *psz_name = NULL;
  85     input_item_t *p_current_input = GetCurrentItem(p_demux);
  86     p_demux->p_sys->pp_tracklist = NULL;
  87     p_demux->p_sys->i_tracklist_entries = 0;
  88     p_demux->p_sys->i_track_id = -1;
  89     p_demux->p_sys->psz_base = NULL;
  90
  91     /* create new xml parser from stream */
  92     p_xml_reader = xml_ReaderCreate( p_demux, p_demux->s );
  93     if( !p_xml_reader )
  94         goto end;
  95
  96     /* locating the root node */
  97     if( xml_ReaderNextNode( p_xml_reader ) != XML_READER_STARTELEM )
  98     {
  99         msg_Err( p_demux, "can't read xml stream" );
 100         goto end;
 101     }
 102
 103     /* checking root node name */
 104     psz_name = xml_ReaderName( p_xml_reader );
 105     if( !psz_name || strcmp( psz_name, "playlist" ) )
 106     {
 107         msg_Err( p_demux, "invalid root node name: %s", psz_name );
 108         free( psz_name );
 109         goto end;
 110     }
 111     free( psz_name );
 112
 113     input_item_node_t *p_subitems =
 114         input_item_node_Create( p_current_input );
 115
 116     i_ret = parse_playlist_node( p_demux, p_subitems,
 117                                  p_xml_reader, "playlist" ) ? 0 : -1;
 118
 119     for( int i = 0 ; i < p_demux->p_sys->i_tracklist_entries ; i++ )
 120     {
 121         input_item_t *p_new_input = p_demux->p_sys->pp_tracklist[i];
 122         if( p_new_input )
 123         {
 124             input_item_node_AppendItem( p_subitems, p_new_input );
 125         }
 126     }
 127
 128     input_item_node_PostAndDelete( p_subitems );
 129
 130 end:
 131     vlc_gc_decref(p_current_input);
 132     if( p_xml_reader )
 133         xml_ReaderDelete( p_xml_reader );
 134     return i_ret; /* Needed for correct operation of go back */
 135 }
 136
 137 /** \brief dummy function for demux callback interface */
 138 static int Control( demux_t *p_demux, int i_query, va_list args )
 139 {
 140     VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
 141     return VLC_EGENERIC;
 142 }
 143
 144 /**
 145  * \brief parse the root node of a XSPF playlist
 146  * \param p_demux demuxer instance
 147  * \param p_input_item current input item
 148  * \param p_xml_reader xml reader instance
 149  * \param psz_element name of element to parse
 150  */
 151 static bool parse_playlist_node COMPLEX_INTERFACE
 152 {
 153     input_item_t *p_input_item = p_input_node->p_item;
 154     char *psz_name = NULL;
 155     char *psz_value = NULL;
 156     bool b_version_found = false;
 157     int i_node;
 158     bool b_ret = false;
 159     xml_elem_hnd_t *p_handler = NULL;
 160
 161     xml_elem_hnd_t pl_elements[] =
 162         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 163           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 164           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 165           {"info",         SIMPLE_CONTENT,  {NULL} },
 166           {"location",     SIMPLE_CONTENT,  {NULL} },
 167           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 168           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 169           {"date",         SIMPLE_CONTENT,  {NULL} },
 170           {"license",      SIMPLE_CONTENT,  {NULL} },
 171           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 172           {"link",         SIMPLE_CONTENT,  {NULL} },
 173           {"meta",         SIMPLE_CONTENT,  {NULL} },
 174           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 175           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 176           {NULL,           UNKNOWN_CONTENT, {NULL} }
 177         };
 178
 179     /* read all playlist attributes */
 180     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 181     {
 182         psz_name = xml_ReaderName( p_xml_reader );
 183         psz_value = xml_ReaderValue( p_xml_reader );
 184         if( !psz_name || !psz_value )
 185         {
 186             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 187             goto end;
 188         }
 189         /* attribute: version */
 190         if( !strcmp( psz_name, "version" ) )
 191         {
 192             b_version_found = true;
 193             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 194                 msg_Warn( p_demux, "unsupported XSPF version" );
 195         }
 196         /* attribute: xmlns */
 197         else if( !strcmp( psz_name, "xmlns" ) || !strcmp( psz_name, "xmlns:vlc" ) )
 198             ;
 199         else if( !strcmp( psz_name, "xml:base" ) )
 200         {
 201             p_demux->p_sys->psz_base = strdup( psz_value );
 202         }
 203         /* unknown attribute */
 204         else
 205             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 206
 207         free( psz_name );
 208         free( psz_value );
 209     }
 210     /* attribute version is mandatory !!! */
 211     if( !b_version_found )
 212         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 213
 214     /* parse the child elements - we only take care of <trackList> */
 215     psz_name = NULL;
 216     psz_value = NULL;
 217     while( (i_node = xml_ReaderNextNode( p_xml_reader )) > 0 )
 218     {
 219         switch( i_node )
 220         {
 221             case XML_READER_STARTELEM:
 222                 /*  element start tag  */
 223                 psz_name = xml_ReaderName( p_xml_reader );
 224                 if( !psz_name || !*psz_name )
 225                 {
 226                     msg_Err( p_demux, "invalid xml stream" );
 227                     goto end;
 228                 }
 229                 /* choose handler */
 230                 for( p_handler = pl_elements;
 231                      p_handler->name && strcmp( psz_name, p_handler->name );
 232                      p_handler++ );
 233                 if( !p_handler->name )
 234                 {
 235                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 236                     goto end;
 237                 }
 238                 FREE_NAME();
 239                 /* complex content is parsed in a separate function */
 240                 if( p_handler->type == COMPLEX_CONTENT )
 241                 {
 242                     FREE_VALUE();
 243                     if( p_handler->pf_handler.cmplx( p_demux,
 244                                                      p_input_node,
 245                                                      p_xml_reader,
 246                                                      p_handler->name ) )
 247                     {
 248                         p_handler = NULL;
 249                     }
 250                     else
 251                     {
 252                         return false;
 253                     }
 254                 }
 255                 break;
 256
 257             case XML_READER_TEXT:
 258                 /* simple element content */
 259                 free( psz_value );
 260                 psz_value = xml_ReaderValue( p_xml_reader );
 261                 if( !psz_value )
 262                 {
 263                     msg_Err( p_demux, "invalid xml stream" );
 264                     goto end;
 265                 }
 266                 break;
 267
 268             case XML_READER_ENDELEM:
 269                 /* element end tag */
 270                 psz_name = xml_ReaderName( p_xml_reader );
 271                 if( !psz_name )
 272                 {
 273                     msg_Err( p_demux, "invalid xml stream" );
 274                     goto end;
 275                 }
 276                 /* leave if the current parent node <playlist> is terminated */
 277                 if( !strcmp( psz_name, psz_element ) )
 278                 {
 279                     b_ret = true;
 280                     goto end;
 281                 }
 282                 /* there MUST have been a start tag for that element name */
 283                 if( !p_handler || !p_handler->name
 284                     || strcmp( p_handler->name, psz_name ))
 285                 {
 286                     msg_Err( p_demux, "there's no open element left for <%s>",
 287                              psz_name );
 288                     goto end;
 289                 }
 290
 291                 if( p_handler->pf_handler.smpl )
 292                 {
 293                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 294                                                 psz_value );
 295                 }
 296                 FREE_ATT();
 297                 p_handler = NULL;
 298                 break;
 299         }
 300     }
 301
 302 end:
 303     free( psz_name );
 304     free( psz_value );
 305     return b_ret;
 306 }
 307
 308 /**
 309  * \brief parses the tracklist node which only may contain <track>s
 310  */
 311 static bool parse_tracklist_node COMPLEX_INTERFACE
 312 {
 313     VLC_UNUSED(psz_element);
 314     char *psz_name;
 315     int i_ntracks = 0;
 316     int i_node;
 317
 318     /* now parse the <track>s */
 319     while( (i_node = xml_ReaderNextNode( p_xml_reader )) > 0 )
 320     {
 321         if( i_node == XML_READER_STARTELEM )
 322         {
 323             char *psz_eltname = xml_ReaderName( p_xml_reader );
 324             if( !psz_eltname )
 325             {
 326                 msg_Err( p_demux, "unexpected end of xml data" );
 327                 free( psz_eltname );
 328                 return false;
 329             }
 330             if( strcmp( psz_eltname, "track") )
 331             {
 332                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 333                          psz_eltname );
 334                 free( psz_eltname );
 335                 return false;
 336             }
 337             free( psz_eltname );
 338
 339             /* parse the track data in a separate function */
 340             if( parse_track_node( p_demux, p_input_node,
 341                                   p_xml_reader, "track" ) )
 342                 i_ntracks++;
 343         }
 344         else if( i_node == XML_READER_ENDELEM )
 345             break;
 346     }
 347
 348     /* the <trackList> has to be terminated */
 349     if( i_node != XML_READER_ENDELEM )
 350     {
 351         msg_Err( p_demux, "there's a missing </trackList>" );
 352         return false;
 353     }
 354     psz_name = xml_ReaderName( p_xml_reader );
 355     if( !psz_name || strcmp( psz_name, "trackList" ) )
 356     {
 357         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 358         free( psz_name );
 359         return false;
 360     }
 361     free( psz_name );
 362
 363     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 364     return true;
 365 }
 366
 367 /**
 368  * \brief parse one track element
 369  * \param COMPLEX_INTERFACE
 370  */
 371 static bool parse_track_node COMPLEX_INTERFACE
 372 {
 373     input_item_t *p_input_item = p_input_node->p_item;
 374     char *psz_name = NULL;
 375     char *psz_value = NULL;
 376     xml_elem_hnd_t *p_handler = NULL;
 377     demux_sys_t *p_sys = p_demux->p_sys;
 378     int i_node;
 379     bool b_ret = false;
 380
 381     xml_elem_hnd_t track_elements[] =
 382         { {"location",     SIMPLE_CONTENT,  {NULL} },
 383           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 384           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 385           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 386           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 387           {"info",         SIMPLE_CONTENT,  {NULL} },
 388           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 389           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 390           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 391           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 392           {"link",         SIMPLE_CONTENT,  {NULL} },
 393           {"meta",         SIMPLE_CONTENT,  {NULL} },
 394           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 395           {NULL,           UNKNOWN_CONTENT, {NULL} }
 396         };
 397
 398     input_item_t *p_new_input = input_item_New( p_demux, NULL, NULL );
 399     input_item_node_t *p_new_node = input_item_node_Create( p_new_input );
 400
 401     if( !p_new_input )
 402     {
 403         /* malloc has failed for input_item_New, so bailout early */
 404         return false;
 405     }
 406
 407     /* reset i_track_id */
 408     p_sys->i_track_id = -1;
 409
 410     while( (i_node = xml_ReaderNextNode( p_xml_reader )) > 0 )
 411     {
 412         switch( i_node )
 413         {
 414             case XML_READER_STARTELEM:
 415                 /*  element start tag  */
 416                 psz_name = xml_ReaderName( p_xml_reader );
 417                 if( !psz_name || !*psz_name )
 418                 {
 419                     msg_Err( p_demux, "invalid xml stream" );
 420                     goto end;
 421                 }
 422                 /* choose handler */
 423                 for( p_handler = track_elements;
 424                      p_handler->name && strcmp( psz_name, p_handler->name );
 425                      p_handler++ );
 426                 if( !p_handler->name )
 427                 {
 428                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 429                     goto end;
 430                 }
 431                 FREE_NAME();
 432                 /* complex content is parsed in a separate function */
 433                 if( p_handler->type == COMPLEX_CONTENT )
 434                 {
 435                     FREE_VALUE();
 436
 437                     bool b_res = p_handler->pf_handler.cmplx( p_demux,
 438                                                         p_new_node,
 439                                                         p_xml_reader,
 440                                                         p_handler->name );
 441                     if( b_res )
 442                     {
 443                         p_handler = NULL;
 444                     }
 445                     else
 446                     {
 447                         return false;
 448                     }
 449                 }
 450                 break;
 451
 452             case XML_READER_TEXT:
 453                 /* simple element content */
 454                 free( psz_value );
 455                 psz_value = xml_ReaderValue( p_xml_reader );
 456                 if( !psz_value )
 457                 {
 458                     msg_Err( p_demux, "invalid xml stream" );
 459                     goto end;
 460                 }
 461                 break;
 462
 463             case XML_READER_ENDELEM:
 464                 /* element end tag */
 465                 psz_name = xml_ReaderName( p_xml_reader );
 466                 if( !psz_name )
 467                 {
 468                     msg_Err( p_demux, "invalid xml stream" );
 469                     goto end;
 470                 }
 471
 472                 /* leave if the current parent node <track> is terminated */
 473                 if( !strcmp( psz_name, psz_element ) )
 474                 {
 475                     free( psz_name );
 476                     free( psz_value );
 477
 478                     /* Make sure we have a URI */
 479                     char *psz_uri = input_item_GetURI( p_new_input );
 480                     if( !psz_uri )
 481                     {
 482                         input_item_SetURI( p_new_input, "vlc://nop" );
 483                     }
 484                     free( psz_uri );
 485
 486                     if( p_sys->i_track_id < 0 )
 487                     {
 488                         input_item_node_AppendNode( p_input_node, p_new_node );
 489                         vlc_gc_decref( p_new_input );
 490                         return true;
 491                     }
 492
 493                     if( p_sys->i_track_id >= p_sys->i_tracklist_entries )
 494                     {
 495                         input_item_t **pp;
 496                         pp = realloc( p_sys->pp_tracklist,
 497                             (p_sys->i_track_id + 1) * sizeof(*pp) );
 498                         if( !pp )
 499                             return false;
 500                         p_sys->pp_tracklist = pp;
 501                         while( p_sys->i_track_id >= p_sys->i_tracklist_entries )
 502                             pp[p_sys->i_tracklist_entries++] = NULL;
 503                     }
 504
 505                     p_sys->pp_tracklist[ p_sys->i_track_id ] = p_new_input;
 506                     return true;
 507                 }
 508                 /* there MUST have been a start tag for that element name */
 509                 if( !p_handler || !p_handler->name
 510                     || strcmp( p_handler->name, psz_name ))
 511                 {
 512                     msg_Err( p_demux, "there's no open element left for <%s>",
 513                              psz_name );
 514                     goto end;
 515                 }
 516
 517                 /* special case: location */
 518                 if( !strcmp( p_handler->name, "location" ) )
 519                 {
 520                     if( psz_value == NULL )
 521                         input_item_SetURI( p_new_input, "vlc://nop" );
 522                     else
 523                     /* FIXME: This is broken. Scheme-relative (//...) locations
 524                      * and anchors (#...) are not resolved correctly. Also,
 525                      * host-relative (/...) and directory-relative locations
 526                      * ("relative path" in vernacular) should be resolved.
 527                      * Last, psz_base should default to the XSPF resource
 528                      * location if missing (not the current working directory).
 529                      * -- Courmisch */
 530                     if( p_sys->psz_base && !strstr( psz_value, "://" ) )
 531                     {
 532                         char* psz_tmp;
 533                         if( asprintf( &psz_tmp, "%s%s", p_sys->psz_base,
 534                                       psz_value ) == -1 )
 535                         {
 536                             goto end;
 537                         }
 538                         input_item_SetURI( p_new_input, psz_tmp );
 539                         free( psz_tmp );
 540                     }
 541                     else
 542                         input_item_SetURI( p_new_input, psz_value );
 543                     input_item_CopyOptions( p_input_item, p_new_input );
 544                 }
 545                 else
 546                 {
 547                     /* there MUST be an item */
 548                     if( p_handler->pf_handler.smpl )
 549                     {
 550                         p_handler->pf_handler.smpl( p_new_input,
 551                                                     p_handler->name,
 552                                                     psz_value );
 553                         FREE_ATT();
 554                     }
 555                 }
 556                 FREE_ATT();
 557                 p_handler = NULL;
 558                 break;
 559         }
 560     }
 561     msg_Err( p_demux, "unexpected end of xml data" );
 562
 563 end:
 564     free( psz_name );
 565     free( psz_value );
 566     return b_ret;
 567 }
 568
 569 /**
 570  * \brief handles the supported <track> sub-elements
 571  */
 572 static bool set_item_info SIMPLE_INTERFACE
 573 {
 574     /* exit if setting is impossible */
 575     if( !psz_name || !psz_value || !p_input )
 576         return false;
 577
 578     /* re-convert xml special characters inside psz_value */
 579     resolve_xml_special_chars( psz_value );
 580
 581     /* handle each info element in a separate "if" clause */
 582     if( !strcmp( psz_name, "title" ) )
 583     {
 584         input_item_SetTitle( p_input, psz_value );
 585     }
 586     else if( !strcmp( psz_name, "creator" ) )
 587     {
 588         input_item_SetArtist( p_input, psz_value );
 589     }
 590     else if( !strcmp( psz_name, "album" ) )
 591     {
 592         input_item_SetAlbum( p_input, psz_value );
 593
 594     }
 595     else if( !strcmp( psz_name, "trackNum" ) )
 596     {
 597         input_item_SetTrackNum( p_input, psz_value );
 598     }
 599     else if( !strcmp( psz_name, "duration" ) )
 600     {
 601         long i_num = atol( psz_value );
 602         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 603     }
 604     else if( !strcmp( psz_name, "annotation" ) )
 605     {
 606         input_item_SetDescription( p_input, psz_value );
 607     }
 608     else if( !strcmp( psz_name, "image" ) )
 609     {
 610         input_item_SetArtURL( p_input, psz_value );
 611     }
 612     return true;
 613 }
 614
 615 /**
 616  * \brief handles the <vlc:option> elements
 617  */
 618 static bool set_option SIMPLE_INTERFACE
 619 {
 620     /* exit if setting is impossible */
 621     if( !psz_name || !psz_value || !p_input )
 622         return false;
 623
 624     /* re-convert xml special characters inside psz_value */
 625     resolve_xml_special_chars( psz_value );
 626
 627     input_item_AddOption( p_input, psz_value, 0 );
 628
 629     return true;
 630 }
 631
 632 /**
 633  * \brief parse the extension node of a XSPF playlist
 634  */
 635 static bool parse_extension_node COMPLEX_INTERFACE
 636 {
 637     input_item_t *p_input_item = p_input_node->p_item;
 638     char *psz_name = NULL;
 639     char *psz_value = NULL;
 640     char *psz_title = NULL;
 641     char *psz_application = NULL;
 642     int i_node;
 643     bool b_release_input_item = false;
 644     xml_elem_hnd_t *p_handler = NULL;
 645     input_item_t *p_new_input = NULL;
 646
 647     xml_elem_hnd_t pl_elements[] =
 648         { {"vlc:node",   COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 649           {"vlc:item",   COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 650           {"vlc:id",     SIMPLE_CONTENT, {NULL} },
 651           {"vlc:option", SIMPLE_CONTENT, {.smpl = set_option} },
 652           {NULL,    UNKNOWN_CONTENT, {NULL} }
 653         };
 654
 655     /* read all extension node attributes */
 656     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 657     {
 658         psz_name = xml_ReaderName( p_xml_reader );
 659         psz_value = xml_ReaderValue( p_xml_reader );
 660         if( !psz_name || !psz_value )
 661         {
 662             msg_Err( p_demux, "invalid xml stream @ <vlc:node>" );
 663             FREE_ATT();
 664             return false;
 665         }
 666         /* attribute: title */
 667         if( !strcmp( psz_name, "title" ) )
 668         {
 669             resolve_xml_special_chars( psz_value );
 670             psz_title = psz_value;
 671         }
 672         /* extension attribute: application */
 673         else if( !strcmp( psz_name, "application" ) )
 674         {
 675             psz_application = psz_value;
 676         }
 677         /* unknown attribute */
 678         else
 679         {
 680             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element,
 681                       psz_name );
 682             FREE_VALUE();
 683         }
 684         FREE_NAME();
 685         psz_value = NULL;
 686     }
 687
 688     /* attribute title is mandatory except for <extension> */
 689     if( !strcmp( psz_element, "vlc:node" ) )
 690     {
 691         if( !psz_title )
 692         {
 693             msg_Warn( p_demux, "<vlc:node> requires \"title\" attribute" );
 694             return false;
 695         }
 696         p_new_input = input_item_NewWithType( VLC_OBJECT( p_demux ),
 697                           "vlc://nop", psz_title, 0, NULL, 0, -1,
 698                           ITEM_TYPE_DIRECTORY );
 699         if( p_new_input )
 700         {
 701             p_input_node =
 702                 input_item_node_AppendItem( p_input_node, p_new_input );
 703             p_input_item = p_new_input;
 704             b_release_input_item = true;
 705         }
 706         free( psz_title );
 707     }
 708     else if( !strcmp( psz_element, "extension" ) )
 709     {
 710         if( !psz_application )
 711         {
 712             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 713             return false;
 714         }
 715         /* Skip the extension if the application is not vlc
 716            This will skip all children of the current node */
 717         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 718         {
 719             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 720             free( psz_application );
 721             /* Skip all children */
 722             for( unsigned lvl = 1; lvl; )
 723                 switch( xml_ReaderNextNode( p_xml_reader ) )
 724                 {
 725                     case XML_READER_STARTELEM: lvl++; break;
 726                     case XML_READER_ENDELEM:   lvl--; break;
 727                     case 0: case -1: return -1;
 728                 }
 729             return true;
 730         }
 731     }
 732     free( psz_application );
 733
 734
 735     /* parse the child elements */
 736     while( (i_node = xml_ReaderNextNode( p_xml_reader )) > 0 )
 737     {
 738         switch( i_node )
 739         {
 740             case XML_READER_STARTELEM:
 741                 /*  element start tag  */
 742                 psz_name = xml_ReaderName( p_xml_reader );
 743                 if( !psz_name || !*psz_name )
 744                 {
 745                     msg_Err( p_demux, "invalid xml stream" );
 746                     FREE_ATT();
 747                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 748                     return false;
 749                 }
 750                 /* choose handler */
 751                 for( p_handler = pl_elements;
 752                      p_handler->name && strcmp( psz_name, p_handler->name );
 753                      p_handler++ );
 754                 if( !p_handler->name )
 755                 {
 756                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 757                     FREE_ATT();
 758                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 759                     return false;
 760                 }
 761                 FREE_NAME();
 762                 /* complex content is parsed in a separate function */
 763                 if( p_handler->type == COMPLEX_CONTENT )
 764                 {
 765                     if( p_handler->pf_handler.cmplx( p_demux,
 766                                                      p_input_node,
 767                                                      p_xml_reader,
 768                                                      p_handler->name ) )
 769                     {
 770                         p_handler = NULL;
 771                         FREE_ATT();
 772                     }
 773                     else
 774                     {
 775                         FREE_ATT();
 776                         if( b_release_input_item ) vlc_gc_decref( p_new_input );
 777                         return false;
 778                     }
 779                 }
 780                 break;
 781
 782             case XML_READER_TEXT:
 783                 /* simple element content */
 784                 FREE_ATT();
 785                 psz_value = xml_ReaderValue( p_xml_reader );
 786                 if( !psz_value )
 787                 {
 788                     msg_Err( p_demux, "invalid xml stream" );
 789                     FREE_ATT();
 790                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 791                     return false;
 792                 }
 793                 break;
 794
 795             case XML_READER_ENDELEM:
 796                 /* element end tag */
 797                 psz_name = xml_ReaderName( p_xml_reader );
 798                 if( !psz_name )
 799                 {
 800                     msg_Err( p_demux, "invalid xml stream" );
 801                     FREE_ATT();
 802                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 803                     return false;
 804                 }
 805                 /* leave if the current parent node is terminated */
 806                 if( !strcmp( psz_name, psz_element ) )
 807                 {
 808                     FREE_ATT();
 809                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 810                     return true;
 811                 }
 812                 /* there MUST have been a start tag for that element name */
 813                 if( !p_handler || !p_handler->name
 814                     || strcmp( p_handler->name, psz_name ))
 815                 {
 816                     msg_Err( p_demux, "there's no open element left for <%s>",
 817                              psz_name );
 818                     FREE_ATT();
 819                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 820                     return false;
 821                 }
 822
 823                 /* special tag <vlc:id> */
 824                 if( !strcmp( p_handler->name, "vlc:id" ) )
 825                 {
 826                     p_demux->p_sys->i_track_id = atoi( psz_value );
 827                 }
 828                 else if( p_handler->pf_handler.smpl )
 829                 {
 830                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 831                                                 psz_value );
 832                 }
 833                 FREE_ATT();
 834                 p_handler = NULL;
 835                 break;
 836         }
 837         FREE_NAME();
 838     }
 839     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 840     return false;
 841 }
 842
 843 /**
 844  * \brief parse the extension item node of a XSPF playlist
 845  */
 846 static bool parse_extitem_node COMPLEX_INTERFACE
 847 {
 848     VLC_UNUSED(psz_element);
 849     input_item_t *p_new_input = NULL;
 850     int i_tid = -1;
 851
 852     /* read all extension item attributes */
 853     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 854     {
 855         char *psz_name = xml_ReaderName( p_xml_reader );
 856         char *psz_value = xml_ReaderValue( p_xml_reader );
 857         if( !psz_name || !psz_value )
 858         {
 859             msg_Err( p_demux, "invalid xml stream @ <vlc:item>" );
 860             free( psz_name );
 861             free( psz_value );
 862             return false;
 863         }
 864         /* attribute: href */
 865         if( !strcmp( psz_name, "tid" ) )
 866         {
 867             i_tid = atoi( psz_value );
 868         }
 869         /* unknown attribute */
 870         else
 871             msg_Warn( p_demux, "invalid <vlc:item> attribute:\"%s\"", psz_name);
 872
 873         free( psz_name );
 874         free( psz_value );
 875     }
 876
 877     /* attribute href is mandatory */
 878     if( i_tid < 0 )
 879     {
 880         msg_Warn( p_demux, "<vlc:item> requires \"tid\" attribute" );
 881         return false;
 882     }
 883
 884     if( i_tid >= p_demux->p_sys->i_tracklist_entries )
 885     {
 886         msg_Warn( p_demux, "invalid \"tid\" attribute" );
 887         return false;
 888     }
 889
 890     p_new_input = p_demux->p_sys->pp_tracklist[ i_tid ];
 891     if( p_new_input )
 892     {
 893         input_item_node_AppendItem( p_input_node, p_new_input );
 894         vlc_gc_decref( p_new_input );
 895         p_demux->p_sys->pp_tracklist[i_tid] = NULL;
 896     }
 897
 898     return true;
 899 }
 900
 901 /**
 902  * \brief skips complex element content that we can't manage
 903  */
 904 static bool skip_element COMPLEX_INTERFACE
 905 {
 906     VLC_UNUSED(p_demux); VLC_UNUSED(p_input_node);
 907     VLC_UNUSED(psz_element);
 908
 909     for( unsigned lvl = 1; lvl; )
 910         switch( xml_ReaderNextNode( p_xml_reader ) )
 911         {
 912             case XML_READER_STARTELEM: lvl++; break;
 913             case XML_READER_ENDELEM:   lvl--; break;
 914             case 0: case -1: return false;
 915         }
 916
 917     return true;
 918 }