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/input.h>
  31 #include <vlc/intf.h>
  32
  33 #include "playlist.h"
  34 #include "vlc_xml.h"
  35 #include "vlc_strings.h"
  36 #include "vlc_url.h"
  37 #include "xspf.h"
  38
  39 struct demux_sys_t
  40 {
  41     playlist_item_t *p_item_in_category;
  42     int i_parent_id;
  43     input_item_t **pp_tracklist;
  44     int i_tracklist_entries;
  45     int i_identifier;
  46 };
  47
  48 static int Control( demux_t *, int, va_list );
  49 static int Demux( demux_t * );
  50
  51 /**
  52  * \brief XSPF submodule initialization function
  53  */
  54 int E_(Import_xspf)( vlc_object_t *p_this )
  55 {
  56     DEMUX_BY_EXTENSION_OR_FORCED_MSG( ".xspf", "xspf-open",
  57                                       "using XSPF playlist reader" );
  58     return VLC_SUCCESS;
  59 }
  60
  61 void E_(Close_xspf)( vlc_object_t *p_this )
  62 {
  63     demux_t *p_demux = (demux_t *)p_this;
  64     free( p_demux->p_sys );
  65 }
  66
  67 /**
  68  * \brief demuxer function for XSPF parsing
  69  */
  70 int Demux( demux_t *p_demux )
  71 {
  72     int i_ret = VLC_SUCCESS;
  73     xml_t *p_xml = NULL;
  74     xml_reader_t *p_xml_reader = NULL;
  75     char *psz_name = NULL;
  76     INIT_PLAYLIST_STUFF;
  77     p_demux->p_sys->p_item_in_category = p_item_in_category;
  78     p_demux->p_sys->i_parent_id = i_parent_id;
  79     p_demux->p_sys->pp_tracklist = NULL;
  80     p_demux->p_sys->i_tracklist_entries = 0;
  81     p_demux->p_sys->i_identifier = -1;
  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     i_ret = parse_playlist_node( p_demux, p_playlist, p_current, NULL,
 120                                  p_xml_reader, "playlist" );
 121     HANDLE_PLAY_AND_RELEASE;
 122     if( p_xml_reader )
 123         xml_ReaderDelete( p_xml, p_xml_reader );
 124     if( p_xml )
 125         xml_Delete( p_xml );
 126     return VLC_SUCCESS;
 127 }
 128
 129 /** \brief dummy function for demux callback interface */
 130 static int Control( demux_t *p_demux, int i_query, va_list args )
 131 {
 132     return VLC_EGENERIC;
 133 }
 134
 135 /**
 136  * \brief parse the root node of a XSPF playlist
 137  * \param p_demux demuxer instance
 138  * \param p_playlist playlist instance
 139  * \param p_item current playlist item
 140  * \param p_input current input item
 141  * \param p_xml_reader xml reader instance
 142  * \param psz_element name of element to parse
 143  */
 144 static vlc_bool_t parse_playlist_node COMPLEX_INTERFACE
 145 {
 146     char *psz_name=NULL;
 147     char *psz_value=NULL;
 148     vlc_bool_t b_version_found = VLC_FALSE;
 149     int i_node;
 150     xml_elem_hnd_t *p_handler=NULL;
 151
 152     xml_elem_hnd_t pl_elements[] =
 153         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 154           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 155           {"annotation",   SIMPLE_CONTENT,  {NULL} },
 156           {"info",         SIMPLE_CONTENT,  {NULL} },
 157           {"location",     SIMPLE_CONTENT,  {NULL} },
 158           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 159           {"image",        SIMPLE_CONTENT,  {NULL} },
 160           {"date",         SIMPLE_CONTENT,  {NULL} },
 161           {"license",      SIMPLE_CONTENT,  {NULL} },
 162           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 163           {"link",         SIMPLE_CONTENT,  {NULL} },
 164           {"meta",         SIMPLE_CONTENT,  {NULL} },
 165           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 166           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 167           {NULL,           UNKNOWN_CONTENT, {NULL} }
 168         };
 169
 170     /* read all playlist attributes */
 171     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 172     {
 173         psz_name = xml_ReaderName( p_xml_reader );
 174         psz_value = xml_ReaderValue( p_xml_reader );
 175         if( !psz_name || !psz_value )
 176         {
 177             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 178             FREE_ATT();
 179             return VLC_FALSE;
 180         }
 181         /* attribute: version */
 182         if( !strcmp( psz_name, "version" ) )
 183         {
 184             b_version_found = VLC_TRUE;
 185             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 186                 msg_Warn( p_demux, "unsupported XSPF version" );
 187         }
 188         /* attribute: xmlns */
 189         else if( !strcmp( psz_name, "xmlns" ) )
 190             ;
 191         /* unknown attribute */
 192         else
 193             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 194
 195         FREE_ATT();
 196     }
 197     /* attribute version is mandatory !!! */
 198     if( !b_version_found )
 199         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 200
 201     /* parse the child elements - we only take care of <trackList> */
 202     while( xml_ReaderRead( p_xml_reader ) == 1 )
 203     {
 204         i_node = xml_ReaderNodeType( p_xml_reader );
 205         switch( i_node )
 206         {
 207             case XML_READER_NONE:
 208                 break;
 209             case XML_READER_STARTELEM:
 210                 /*  element start tag  */
 211                 psz_name = xml_ReaderName( p_xml_reader );
 212                 if( !psz_name || !*psz_name )
 213                 {
 214                     msg_Err( p_demux, "invalid xml stream" );
 215                     FREE_ATT();
 216                     return VLC_FALSE;
 217                 }
 218                 /* choose handler */
 219                 for( p_handler = pl_elements;
 220                      p_handler->name && strcmp( psz_name, p_handler->name );
 221                      p_handler++ );
 222                 if( !p_handler->name )
 223                 {
 224                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 225                     FREE_ATT();
 226                     return VLC_FALSE;
 227                 }
 228                 FREE_NAME();
 229                 /* complex content is parsed in a separate function */
 230                 if( p_handler->type == COMPLEX_CONTENT )
 231                 {
 232                     if( p_handler->pf_handler.cmplx( p_demux,
 233                                                      p_playlist,
 234                                                      p_item,NULL,
 235                                                      p_xml_reader,
 236                                                      p_handler->name ) )
 237                     {
 238                         p_handler = NULL;
 239                         FREE_ATT();
 240                     }
 241                     else
 242                     {
 243                         FREE_ATT();
 244                         return VLC_FALSE;
 245                     }
 246                 }
 247                 break;
 248
 249             case XML_READER_TEXT:
 250                 /* simple element content */
 251                 FREE_ATT();
 252                 psz_value = xml_ReaderValue( p_xml_reader );
 253                 if( !psz_value )
 254                 {
 255                     msg_Err( p_demux, "invalid xml stream" );
 256                     FREE_ATT();
 257                     return VLC_FALSE;
 258                 }
 259                 break;
 260
 261             case XML_READER_ENDELEM:
 262                 /* element end tag */
 263                 psz_name = xml_ReaderName( p_xml_reader );
 264                 if( !psz_name )
 265                 {
 266                     msg_Err( p_demux, "invalid xml stream" );
 267                     FREE_ATT();
 268                     return VLC_FALSE;
 269                 }
 270                 /* leave if the current parent node <playlist> is terminated */
 271                 if( !strcmp( psz_name, psz_element ) )
 272                 {
 273                     FREE_ATT();
 274                     return VLC_TRUE;
 275                 }
 276                 /* there MUST have been a start tag for that element name */
 277                 if( !p_handler || !p_handler->name
 278                     || strcmp( p_handler->name, psz_name ))
 279                 {
 280                     msg_Err( p_demux, "there's no open element left for <%s>",
 281                              psz_name );
 282                     FREE_ATT();
 283                     return VLC_FALSE;
 284                 }
 285
 286                 if( p_handler->pf_handler.smpl )
 287                 {
 288                     p_handler->pf_handler.smpl( p_item, NULL, p_handler->name,
 289                                                 psz_value );
 290                 }
 291                 FREE_ATT();
 292                 p_handler = NULL;
 293                 break;
 294
 295             default:
 296                 /* unknown/unexpected xml node */
 297                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 298                 FREE_ATT();
 299                 return VLC_FALSE;
 300         }
 301         FREE_NAME();
 302     }
 303     return VLC_FALSE;
 304 }
 305
 306 /**
 307  * \brief parses the tracklist node which only may contain <track>s
 308  */
 309 static vlc_bool_t parse_tracklist_node COMPLEX_INTERFACE
 310 {
 311     char *psz_name=NULL;
 312     int i_node;
 313     int i_ntracks = 0;
 314
 315     /* now parse the <track>s */
 316     while( xml_ReaderRead( p_xml_reader ) == 1 )
 317     {
 318         i_node = xml_ReaderNodeType( p_xml_reader );
 319         if( i_node == XML_READER_STARTELEM )
 320         {
 321             psz_name = xml_ReaderName( p_xml_reader );
 322             if( !psz_name )
 323             {
 324                 msg_Err( p_demux, "unexpected end of xml data" );
 325                 FREE_NAME();
 326                 return VLC_FALSE;
 327             }
 328             if( strcmp( psz_name, "track") )
 329             {
 330                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 331                          psz_name );
 332                 FREE_NAME();
 333                 return VLC_FALSE;
 334             }
 335             FREE_NAME();
 336
 337             /* parse the track data in a separate function */
 338             if( parse_track_node( p_demux, p_playlist, p_item, NULL,
 339                                    p_xml_reader,"track" ) == VLC_TRUE )
 340                 i_ntracks++;
 341         }
 342         else if( i_node == XML_READER_ENDELEM )
 343             break;
 344     }
 345
 346     /* the <trackList> has to be terminated */
 347     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 348     {
 349         msg_Err( p_demux, "there's a missing </trackList>" );
 350         FREE_NAME();
 351         return VLC_FALSE;
 352     }
 353     psz_name = xml_ReaderName( p_xml_reader );
 354     if( !psz_name || strcmp( psz_name, "trackList" ) )
 355     {
 356         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 357         FREE_NAME();
 358         return VLC_FALSE;
 359     }
 360     FREE_NAME();
 361
 362     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 363
 364     return VLC_TRUE;
 365 }
 366
 367 /**
 368  * \brief parse one track element
 369  * \param COMPLEX_INTERFACE
 370  */
 371 static vlc_bool_t parse_track_node COMPLEX_INTERFACE
 372 {
 373     input_item_t *p_new_input = NULL;
 374     int i_node;
 375     char *psz_name=NULL;
 376     char *psz_value=NULL;
 377     xml_elem_hnd_t *p_handler=NULL;
 378
 379     xml_elem_hnd_t track_elements[] =
 380         { {"location",     SIMPLE_CONTENT,  {NULL} },
 381           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 382           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 383           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 384           {"annotation",   SIMPLE_CONTENT,  {NULL} },
 385           {"info",         SIMPLE_CONTENT,  {NULL} },
 386           {"image",        SIMPLE_CONTENT,  {NULL} },
 387           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 388           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 389           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 390           {"link",         SIMPLE_CONTENT,  {NULL} },
 391           {"meta",         SIMPLE_CONTENT,  {NULL} },
 392           {"extension",    COMPLEX_CONTENT, {.cmplx = skip_element} },
 393           {NULL,           UNKNOWN_CONTENT, {NULL} }
 394         };
 395
 396     while( xml_ReaderRead( p_xml_reader ) == 1 )
 397     {
 398         i_node = xml_ReaderNodeType( p_xml_reader );
 399         switch( i_node )
 400         {
 401             case XML_READER_NONE:
 402                 break;
 403
 404             case XML_READER_STARTELEM:
 405                 /*  element start tag  */
 406                 psz_name = xml_ReaderName( p_xml_reader );
 407                 if( !psz_name || !*psz_name )
 408                 {
 409                     msg_Err( p_demux, "invalid xml stream" );
 410                     FREE_ATT();
 411                     return VLC_FALSE;
 412                 }
 413                 /* choose handler */
 414                 for( p_handler = track_elements;
 415                      p_handler->name && strcmp( psz_name, p_handler->name );
 416                      p_handler++ );
 417                 if( !p_handler->name )
 418                 {
 419                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 420                     FREE_ATT();
 421                     return VLC_FALSE;
 422                 }
 423                 FREE_NAME();
 424                 /* complex content is parsed in a separate function */
 425                 if( p_handler->type == COMPLEX_CONTENT )
 426                 {
 427                     if( !p_new_input )
 428                     {
 429                         msg_Err( p_demux,
 430                                  "at <%s> level no new item has been allocated",
 431                                  p_handler->name );
 432                         FREE_ATT();
 433                         return VLC_FALSE;
 434                     }
 435                     if( p_handler->pf_handler.cmplx( p_demux,
 436                                                      p_playlist,
 437                                                      NULL, p_new_input,
 438                                                      p_xml_reader,
 439                                                      p_handler->name ) )
 440                     {
 441                         p_handler = NULL;
 442                         FREE_ATT();
 443                     }
 444                     else
 445                     {
 446                         FREE_ATT();
 447                         return VLC_FALSE;
 448                     }
 449                 }
 450                 break;
 451
 452             case XML_READER_TEXT:
 453                 /* simple element content */
 454                 FREE_ATT();
 455                 psz_value = xml_ReaderValue( p_xml_reader );
 456                 if( !psz_value )
 457                 {
 458                     msg_Err( p_demux, "invalid xml stream" );
 459                     FREE_ATT();
 460                     return VLC_FALSE;
 461                 }
 462                 break;
 463
 464             case XML_READER_ENDELEM:
 465                 /* element end tag */
 466                 psz_name = xml_ReaderName( p_xml_reader );
 467                 if( !psz_name )
 468                 {
 469                     msg_Err( p_demux, "invalid xml stream" );
 470                     FREE_ATT();
 471                     return VLC_FALSE;
 472                 }
 473                 /* leave if the current parent node <track> is terminated */
 474                 if( !strcmp( psz_name, psz_element ) )
 475                 {
 476                     FREE_ATT();
 477                     /* Add it */
 478                     playlist_AddWhereverNeeded( p_playlist, p_new_input,
 479                               p_item, p_demux->p_sys->p_item_in_category,
 480                               (p_demux->p_sys->i_parent_id >0 ) ? VLC_TRUE:
 481                               VLC_FALSE, PLAYLIST_APPEND );
 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                         p_new_input = input_ItemNewExt( p_playlist, psz_uri,
 530                                                         NULL, 0, NULL, -1 );
 531                         p_new_input->p_meta = vlc_meta_New();
 532                         free( psz_uri );
 533                         input_ItemCopyOptions( p_item->p_input, p_new_input );
 534                         psz_uri = NULL;
 535                         FREE_ATT();
 536                         p_handler = NULL;
 537                     }
 538                     else
 539                     {
 540                         FREE_ATT();
 541                         return VLC_FALSE;
 542                     }
 543                 }
 544                 else if( !strcmp( p_handler->name, "identifier" ) )
 545                 {
 546                     p_demux->p_sys->i_identifier = atoi( psz_value );
 547                 }
 548                 else
 549                 {
 550                     /* there MUST be an item */
 551                     if( !p_new_input )
 552                     {
 553                         msg_Err( p_demux, "item not yet created at <%s>",
 554                                  psz_name );
 555                         FREE_ATT();
 556                         return VLC_FALSE;
 557                     }
 558                     if( p_handler->pf_handler.smpl )
 559                     {
 560                         p_handler->pf_handler.smpl( NULL, p_new_input,
 561                                                     p_handler->name,
 562                                                     psz_value );
 563                         FREE_ATT();
 564                     }
 565                 }
 566                 FREE_ATT();
 567                 p_handler = NULL;
 568                 break;
 569
 570             default:
 571                 /* unknown/unexpected xml node */
 572                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 573                 FREE_ATT();
 574                 return VLC_FALSE;
 575         }
 576         FREE_NAME();
 577     }
 578     msg_Err( p_demux, "unexpected end of xml data" );
 579     FREE_ATT();
 580     return VLC_FALSE;
 581 }
 582
 583 /**
 584  * \brief handles the supported <track> sub-elements
 585  */
 586 static vlc_bool_t set_item_info SIMPLE_INTERFACE
 587 {
 588     /* exit if setting is impossible */
 589     if( !psz_name || !psz_value || !p_input )
 590         return VLC_FALSE;
 591
 592
 593     /* re-convert xml special characters inside psz_value */
 594     resolve_xml_special_chars( psz_value );
 595
 596     /* handle each info element in a separate "if" clause */
 597     if( !strcmp( psz_name, "title" ) )
 598     {
 599         p_input->psz_name = strdup( (char*)psz_value );
 600     }
 601     else if( !strcmp( psz_name, "creator" ) )
 602     {
 603         vlc_meta_SetArtist( p_input->p_meta, psz_value );
 604     }
 605     else if( !strcmp( psz_name, "album" ) )
 606     {
 607         vlc_meta_SetAlbum( p_input->p_meta, psz_value );
 608
 609     }
 610     else if( !strcmp( psz_name, "trackNum" ) )
 611     {
 612         vlc_meta_SetTracknum( p_input->p_meta, psz_value );
 613     }
 614     else if( !strcmp( psz_name, "duration" ) )
 615     {
 616         long i_num = atol( psz_value );
 617         p_input->i_duration = i_num*1000;
 618     }
 619     return VLC_TRUE;
 620 }
 621
 622
 623 /**
 624  * \brief parse the extension node of a XSPF playlist
 625  */
 626 static vlc_bool_t parse_extension_node COMPLEX_INTERFACE
 627 {
 628     char *psz_name = NULL;
 629     char *psz_value = NULL;
 630     char *psz_title = NULL;
 631     int i_node;
 632     xml_elem_hnd_t *p_handler = NULL;
 633
 634     xml_elem_hnd_t pl_elements[] =
 635         { {"node",  COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 636           {"item",  COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 637           {NULL,    UNKNOWN_CONTENT, {NULL} }
 638         };
 639
 640     /* read all extension node attributes */
 641     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 642     {
 643         psz_name = xml_ReaderName( p_xml_reader );
 644         psz_value = xml_ReaderValue( p_xml_reader );
 645         if( !psz_name || !psz_value )
 646         {
 647             msg_Err( p_demux, "invalid xml stream @ <node>" );
 648             FREE_ATT();
 649             return VLC_FALSE;
 650         }
 651         /* attribute: title */
 652         if( !strcmp( psz_name, "title" ) )
 653         {
 654             psz_title = unescape_URI_duplicate( psz_value );
 655         }
 656         /* unknown attribute */
 657         else
 658             msg_Warn( p_demux, "invalid <node> attribute:\"%s\"", psz_name);
 659
 660         FREE_ATT();
 661     }
 662
 663     /* attribute title is mandatory except for <extension> */
 664     if( !strcmp( psz_element, "node" ) && !psz_title )
 665     {
 666         msg_Warn( p_demux, "<node> requires \"title\" attribute" );
 667         return VLC_FALSE;
 668     }
 669     if( psz_title ) free( psz_title );
 670
 671     /* parse the child elements */
 672     while( xml_ReaderRead( p_xml_reader ) == 1 )
 673     {
 674         i_node = xml_ReaderNodeType( p_xml_reader );
 675         switch( i_node )
 676         {
 677             case XML_READER_NONE:
 678                 break;
 679             case XML_READER_STARTELEM:
 680                 /*  element start tag  */
 681                 psz_name = xml_ReaderName( p_xml_reader );
 682                 if( !psz_name || !*psz_name )
 683                 {
 684                     msg_Err( p_demux, "invalid xml stream" );
 685                     FREE_ATT();
 686                     return VLC_FALSE;
 687                 }
 688                 /* choose handler */
 689                 for( p_handler = pl_elements;
 690                      p_handler->name && strcmp( psz_name, p_handler->name );
 691                      p_handler++ );
 692                 if( !p_handler->name )
 693                 {
 694                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 695                     FREE_ATT();
 696                     return VLC_FALSE;
 697                 }
 698                 FREE_NAME();
 699                 /* complex content is parsed in a separate function */
 700                 if( p_handler->type == COMPLEX_CONTENT )
 701                 {
 702                     if( p_handler->pf_handler.cmplx( p_demux,
 703                                                      p_playlist,
 704                                                      p_item, NULL,
 705                                                      p_xml_reader,
 706                                                      p_handler->name ) )
 707                     {
 708                         p_handler = NULL;
 709                         FREE_ATT();
 710                     }
 711                     else
 712                     {
 713                         FREE_ATT();
 714                         return VLC_FALSE;
 715                     }
 716                 }
 717                 break;
 718
 719             case XML_READER_TEXT:
 720                 /* simple element content */
 721                 FREE_ATT();
 722                 psz_value = xml_ReaderValue( p_xml_reader );
 723                 if( !psz_value )
 724                 {
 725                     msg_Err( p_demux, "invalid xml stream" );
 726                     FREE_ATT();
 727                     return VLC_FALSE;
 728                 }
 729                 break;
 730
 731             case XML_READER_ENDELEM:
 732                 /* element end tag */
 733                 psz_name = xml_ReaderName( p_xml_reader );
 734                 if( !psz_name )
 735                 {
 736                     msg_Err( p_demux, "invalid xml stream" );
 737                     FREE_ATT();
 738                     return VLC_FALSE;
 739                 }
 740                 /* leave if the current parent node is terminated */
 741                 if( !strcmp( psz_name, psz_element ) )
 742                 {
 743                     FREE_ATT();
 744                     return VLC_TRUE;
 745                 }
 746                 /* there MUST have been a start tag for that element name */
 747                 if( !p_handler || !p_handler->name
 748                     || strcmp( p_handler->name, psz_name ))
 749                 {
 750                     msg_Err( p_demux, "there's no open element left for <%s>",
 751                              psz_name );
 752                     FREE_ATT();
 753                     return VLC_FALSE;
 754                 }
 755
 756                 if( p_handler->pf_handler.smpl )
 757                 {
 758                     p_handler->pf_handler.smpl( p_item, NULL, p_handler->name,
 759                                                 psz_value );
 760                 }
 761                 FREE_ATT();
 762                 p_handler = NULL;
 763                 break;
 764
 765             default:
 766                 /* unknown/unexpected xml node */
 767                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 768                 FREE_ATT();
 769                 return VLC_FALSE;
 770         }
 771         FREE_NAME();
 772     }
 773     return VLC_FALSE;
 774 }
 775
 776 /**
 777  * \brief parse the extension item node of a XSPF playlist
 778  */
 779 static vlc_bool_t parse_extitem_node COMPLEX_INTERFACE
 780 {
 781     char *psz_name = NULL;
 782     char *psz_value = NULL;
 783     int i_href = -1;
 784
 785     /* read all extension item attributes */
 786     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 787     {
 788         psz_name = xml_ReaderName( p_xml_reader );
 789         psz_value = xml_ReaderValue( p_xml_reader );
 790         if( !psz_name || !psz_value )
 791         {
 792             msg_Err( p_demux, "invalid xml stream @ <item>" );
 793             FREE_ATT();
 794             return VLC_FALSE;
 795         }
 796         /* attribute: href */
 797         if( !strcmp( psz_name, "href" ) )
 798         {
 799             i_href = atoi( psz_value );
 800         }
 801         /* unknown attribute */
 802         else
 803             msg_Warn( p_demux, "invalid <item> attribute:\"%s\"", psz_name);
 804
 805         FREE_ATT();
 806     }
 807
 808     /* attribute href is mandatory */
 809     if( i_href < 0 )
 810     {
 811         msg_Warn( p_demux, "<item> requires \"href\" attribute" );
 812         return VLC_FALSE;
 813     }
 814
 815     if( i_href > p_demux->p_sys->i_tracklist_entries )
 816     {
 817         msg_Warn( p_demux, "invalid \"href\" attribute" );
 818         return VLC_FALSE;
 819     }
 820     return VLC_TRUE;
 821 }
 822
 823 /**
 824  * \brief skips complex element content that we can't manage
 825  */
 826 static vlc_bool_t skip_element COMPLEX_INTERFACE
 827 {
 828     char *psz_endname;
 829
 830     while( xml_ReaderRead( p_xml_reader ) == 1 )
 831     {
 832         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 833         {
 834             psz_endname = xml_ReaderName( p_xml_reader );
 835             if( !psz_endname )
 836                 return VLC_FALSE;
 837             if( !strcmp( psz_element, psz_endname ) )
 838             {
 839                 free( psz_endname );
 840                 return VLC_TRUE;
 841             }
 842             else
 843                 free( psz_endname );
 844         }
 845     }
 846     return VLC_FALSE;
 847 }