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