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