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     i_ret = parse_playlist_node( p_demux, p_playlist, p_current_input,
 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 -1; /* Needed for correct operation of go back */
 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_input_item current input item
 140  * \param p_xml_reader xml reader instance
 141  * \param psz_element name of element to parse
 142  */
 143 static vlc_bool_t parse_playlist_node COMPLEX_INTERFACE
 144 {
 145     char *psz_name=NULL;
 146     char *psz_value=NULL;
 147     vlc_bool_t b_version_found = VLC_FALSE;
 148     int i_node;
 149     xml_elem_hnd_t *p_handler=NULL;
 150
 151     xml_elem_hnd_t pl_elements[] =
 152         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 153           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 154           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 155           {"info",         SIMPLE_CONTENT,  {NULL} },
 156           {"location",     SIMPLE_CONTENT,  {NULL} },
 157           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 158           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 159           {"date",         SIMPLE_CONTENT,  {NULL} },
 160           {"license",      SIMPLE_CONTENT,  {NULL} },
 161           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 162           {"link",         SIMPLE_CONTENT,  {NULL} },
 163           {"meta",         SIMPLE_CONTENT,  {NULL} },
 164           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 165           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 166           {NULL,           UNKNOWN_CONTENT, {NULL} }
 167         };
 168
 169     /* read all playlist attributes */
 170     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 171     {
 172         psz_name = xml_ReaderName( p_xml_reader );
 173         psz_value = xml_ReaderValue( p_xml_reader );
 174         if( !psz_name || !psz_value )
 175         {
 176             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 177             FREE_ATT();
 178             return VLC_FALSE;
 179         }
 180         /* attribute: version */
 181         if( !strcmp( psz_name, "version" ) )
 182         {
 183             b_version_found = VLC_TRUE;
 184             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 185                 msg_Warn( p_demux, "unsupported XSPF version" );
 186         }
 187         /* attribute: xmlns */
 188         else if( !strcmp( psz_name, "xmlns" ) )
 189             ;
 190         else if( !strcmp( psz_name, "xml:base" ) )
 191         {
 192             p_demux->p_sys->psz_base = decode_URI_duplicate( psz_value );
 193         }
 194         /* unknown attribute */
 195         else
 196             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 197
 198         FREE_ATT();
 199     }
 200     /* attribute version is mandatory !!! */
 201     if( !b_version_found )
 202         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 203
 204     /* parse the child elements - we only take care of <trackList> */
 205     while( xml_ReaderRead( p_xml_reader ) == 1 )
 206     {
 207         i_node = xml_ReaderNodeType( p_xml_reader );
 208         switch( i_node )
 209         {
 210             case XML_READER_NONE:
 211                 break;
 212             case XML_READER_STARTELEM:
 213                 /*  element start tag  */
 214                 psz_name = xml_ReaderName( p_xml_reader );
 215                 if( !psz_name || !*psz_name )
 216                 {
 217                     msg_Err( p_demux, "invalid xml stream" );
 218                     FREE_ATT();
 219                     return VLC_FALSE;
 220                 }
 221                 /* choose handler */
 222                 for( p_handler = pl_elements;
 223                      p_handler->name && strcmp( psz_name, p_handler->name );
 224                      p_handler++ );
 225                 if( !p_handler->name )
 226                 {
 227                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 228                     FREE_ATT();
 229                     return VLC_FALSE;
 230                 }
 231                 FREE_NAME();
 232                 /* complex content is parsed in a separate function */
 233                 if( p_handler->type == COMPLEX_CONTENT )
 234                 {
 235                     if( p_handler->pf_handler.cmplx( p_demux,
 236                                                      p_playlist,
 237                                                      p_input_item,
 238                                                      p_xml_reader,
 239                                                      p_handler->name ) )
 240                     {
 241                         p_handler = NULL;
 242                         FREE_ATT();
 243                     }
 244                     else
 245                     {
 246                         FREE_ATT();
 247                         return VLC_FALSE;
 248                     }
 249                 }
 250                 break;
 251
 252             case XML_READER_TEXT:
 253                 /* simple element content */
 254                 FREE_ATT();
 255                 psz_value = xml_ReaderValue( p_xml_reader );
 256                 if( !psz_value )
 257                 {
 258                     msg_Err( p_demux, "invalid xml stream" );
 259                     FREE_ATT();
 260                     return VLC_FALSE;
 261                 }
 262                 break;
 263
 264             case XML_READER_ENDELEM:
 265                 /* element end tag */
 266                 psz_name = xml_ReaderName( p_xml_reader );
 267                 if( !psz_name )
 268                 {
 269                     msg_Err( p_demux, "invalid xml stream" );
 270                     FREE_ATT();
 271                     return VLC_FALSE;
 272                 }
 273                 /* leave if the current parent node <playlist> is terminated */
 274                 if( !strcmp( psz_name, psz_element ) )
 275                 {
 276                     FREE_ATT();
 277                     return VLC_TRUE;
 278                 }
 279                 /* there MUST have been a start tag for that element name */
 280                 if( !p_handler || !p_handler->name
 281                     || strcmp( p_handler->name, psz_name ))
 282                 {
 283                     msg_Err( p_demux, "there's no open element left for <%s>",
 284                              psz_name );
 285                     FREE_ATT();
 286                     return VLC_FALSE;
 287                 }
 288
 289                 if( p_handler->pf_handler.smpl )
 290                 {
 291                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 292                                                 psz_value );
 293                 }
 294                 FREE_ATT();
 295                 p_handler = NULL;
 296                 break;
 297
 298             default:
 299                 /* unknown/unexpected xml node */
 300                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 301                 FREE_ATT();
 302                 return VLC_FALSE;
 303         }
 304         FREE_NAME();
 305     }
 306     return VLC_FALSE;
 307 }
 308
 309 /**
 310  * \brief parses the tracklist node which only may contain <track>s
 311  */
 312 static vlc_bool_t parse_tracklist_node COMPLEX_INTERFACE
 313 {
 314     char *psz_name=NULL;
 315     int i_node;
 316     int i_ntracks = 0;
 317
 318     /* now parse the <track>s */
 319     while( xml_ReaderRead( p_xml_reader ) == 1 )
 320     {
 321         i_node = xml_ReaderNodeType( p_xml_reader );
 322         if( i_node == XML_READER_STARTELEM )
 323         {
 324             psz_name = xml_ReaderName( p_xml_reader );
 325             if( !psz_name )
 326             {
 327                 msg_Err( p_demux, "unexpected end of xml data" );
 328                 FREE_NAME();
 329                 return VLC_FALSE;
 330             }
 331             if( strcmp( psz_name, "track") )
 332             {
 333                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 334                          psz_name );
 335                 FREE_NAME();
 336                 return VLC_FALSE;
 337             }
 338             FREE_NAME();
 339
 340             /* parse the track data in a separate function */
 341             if( parse_track_node( p_demux, p_playlist, p_input_item,
 342                                    p_xml_reader,"track" ) == VLC_TRUE )
 343                 i_ntracks++;
 344         }
 345         else if( i_node == XML_READER_ENDELEM )
 346             break;
 347     }
 348
 349     /* the <trackList> has to be terminated */
 350     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 351     {
 352         msg_Err( p_demux, "there's a missing </trackList>" );
 353         FREE_NAME();
 354         return VLC_FALSE;
 355     }
 356     psz_name = xml_ReaderName( p_xml_reader );
 357     if( !psz_name || strcmp( psz_name, "trackList" ) )
 358     {
 359         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 360         FREE_NAME();
 361         return VLC_FALSE;
 362     }
 363     FREE_NAME();
 364
 365     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 366
 367     return VLC_TRUE;
 368 }
 369
 370 /**
 371  * \brief parse one track element
 372  * \param COMPLEX_INTERFACE
 373  */
 374 static vlc_bool_t parse_track_node COMPLEX_INTERFACE
 375 {
 376     input_item_t *p_new_input = NULL;
 377     int i_node;
 378     char *psz_name=NULL;
 379     char *psz_value=NULL;
 380     xml_elem_hnd_t *p_handler=NULL;
 381
 382     xml_elem_hnd_t track_elements[] =
 383         { {"location",     SIMPLE_CONTENT,  {NULL} },
 384           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 385           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 386           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 387           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 388           {"info",         SIMPLE_CONTENT,  {NULL} },
 389           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 390           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 391           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 392           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 393           {"link",         SIMPLE_CONTENT,  {NULL} },
 394           {"meta",         SIMPLE_CONTENT,  {NULL} },
 395           {"extension",    COMPLEX_CONTENT, {.cmplx = skip_element} },
 396           {NULL,           UNKNOWN_CONTENT, {NULL} }
 397         };
 398
 399     while( xml_ReaderRead( p_xml_reader ) == 1 )
 400     {
 401         i_node = xml_ReaderNodeType( p_xml_reader );
 402         switch( i_node )
 403         {
 404             case XML_READER_NONE:
 405                 break;
 406
 407             case XML_READER_STARTELEM:
 408                 /*  element start tag  */
 409                 psz_name = xml_ReaderName( p_xml_reader );
 410                 if( !psz_name || !*psz_name )
 411                 {
 412                     msg_Err( p_demux, "invalid xml stream" );
 413                     FREE_ATT();
 414                     return VLC_FALSE;
 415                 }
 416                 /* choose handler */
 417                 for( p_handler = track_elements;
 418                      p_handler->name && strcmp( psz_name, p_handler->name );
 419                      p_handler++ );
 420                 if( !p_handler->name )
 421                 {
 422                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 423                     FREE_ATT();
 424                     return VLC_FALSE;
 425                 }
 426                 FREE_NAME();
 427                 /* complex content is parsed in a separate function */
 428                 if( p_handler->type == COMPLEX_CONTENT )
 429                 {
 430                     if( !p_new_input )
 431                     {
 432                         msg_Err( p_demux,
 433                                  "at <%s> level no new item has been allocated",
 434                                  p_handler->name );
 435                         FREE_ATT();
 436                         return VLC_FALSE;
 437                     }
 438                     if( p_handler->pf_handler.cmplx( p_demux,
 439                                                      p_playlist,
 440                                                      p_new_input,
 441                                                      p_xml_reader,
 442                                                      p_handler->name ) )
 443                     {
 444                         p_handler = NULL;
 445                         FREE_ATT();
 446                     }
 447                     else
 448                     {
 449                         FREE_ATT();
 450                         return VLC_FALSE;
 451                     }
 452                 }
 453                 break;
 454
 455             case XML_READER_TEXT:
 456                 /* simple element content */
 457                 FREE_ATT();
 458                 psz_value = xml_ReaderValue( p_xml_reader );
 459                 if( !psz_value )
 460                 {
 461                     msg_Err( p_demux, "invalid xml stream" );
 462                     FREE_ATT();
 463                     return VLC_FALSE;
 464                 }
 465                 break;
 466
 467             case XML_READER_ENDELEM:
 468                 /* element end tag */
 469                 psz_name = xml_ReaderName( p_xml_reader );
 470                 if( !psz_name )
 471                 {
 472                     msg_Err( p_demux, "invalid xml stream" );
 473                     FREE_ATT();
 474                     return VLC_FALSE;
 475                 }
 476                 /* leave if the current parent node <track> is terminated */
 477                 if( !strcmp( psz_name, psz_element ) )
 478                 {
 479                     FREE_ATT();
 480                     input_ItemAddSubItem( p_input_item, p_new_input );
 481                     if( p_demux->p_sys->i_identifier <
 482                         p_demux->p_sys->i_tracklist_entries )
 483                     {
 484                         p_demux->p_sys->pp_tracklist[
 485                             p_demux->p_sys->i_identifier ] = p_new_input;
 486                     }
 487                     else
 488                     {
 489                         if( p_demux->p_sys->i_identifier >
 490                             p_demux->p_sys->i_tracklist_entries )
 491                         {
 492                             p_demux->p_sys->i_tracklist_entries =
 493                                 p_demux->p_sys->i_identifier;
 494                         }
 495                         INSERT_ELEM( p_demux->p_sys->pp_tracklist,
 496                                      p_demux->p_sys->i_tracklist_entries,
 497                                      p_demux->p_sys->i_tracklist_entries,
 498                                      p_new_input );
 499                     }
 500                     return VLC_TRUE;
 501                 }
 502                 /* there MUST have been a start tag for that element name */
 503                 if( !p_handler || !p_handler->name
 504                     || strcmp( p_handler->name, psz_name ))
 505                 {
 506                     msg_Err( p_demux, "there's no open element left for <%s>",
 507                              psz_name );
 508                     FREE_ATT();
 509                     return VLC_FALSE;
 510                 }
 511
 512                 /* special case: location */
 513                 if( !strcmp( p_handler->name, "location" ) )
 514                 {
 515                     char *psz_uri=NULL;
 516                     /* there MUST NOT be an item */
 517                     if( p_new_input )
 518                     {
 519                         msg_Err( p_demux, "item <%s> already created",
 520                                  psz_name );
 521                         FREE_ATT();
 522                         return VLC_FALSE;
 523                     }
 524                     psz_uri = decode_URI_duplicate( psz_value );
 525
 526                     if( psz_uri )
 527                     {
 528                         if( p_demux->p_sys->psz_base &&
 529                             !strstr( psz_uri, "://" ) )
 530                         {
 531                            char* psz_tmp = malloc(
 532                                    strlen(p_demux->p_sys->psz_base) +
 533                                    strlen(psz_uri) +1 );
 534                            if( !psz_tmp )
 535                            {
 536                                msg_Err( p_demux, "out of memory");
 537                                return VLC_FALSE;
 538                            }
 539                            sprintf( psz_tmp, "%s%s",
 540                                     p_demux->p_sys->psz_base, psz_uri );
 541                            free( psz_uri );
 542                            psz_uri = psz_tmp;
 543                         }
 544                         p_new_input = input_ItemNewExt( p_playlist, psz_uri,
 545                                                         NULL, 0, NULL, -1 );
 546                         free( psz_uri );
 547                         input_ItemCopyOptions( p_input_item, p_new_input );
 548                         psz_uri = NULL;
 549                         FREE_ATT();
 550                         p_handler = NULL;
 551                     }
 552                     else
 553                     {
 554                         FREE_ATT();
 555                         return VLC_FALSE;
 556                     }
 557                 }
 558                 else if( !strcmp( p_handler->name, "identifier" ) )
 559                 {
 560                     p_demux->p_sys->i_identifier = atoi( psz_value );
 561                 }
 562                 else
 563                 {
 564                     /* there MUST be an item */
 565                     if( !p_new_input )
 566                     {
 567                         msg_Err( p_demux, "item not yet created at <%s>",
 568                                  psz_name );
 569                         FREE_ATT();
 570                         return VLC_FALSE;
 571                     }
 572                     if( p_handler->pf_handler.smpl )
 573                     {
 574                         p_handler->pf_handler.smpl( p_new_input,
 575                                                     p_handler->name,
 576                                                     psz_value );
 577                         FREE_ATT();
 578                     }
 579                 }
 580                 FREE_ATT();
 581                 p_handler = NULL;
 582                 break;
 583
 584             default:
 585                 /* unknown/unexpected xml node */
 586                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 587                 FREE_ATT();
 588                 return VLC_FALSE;
 589         }
 590         FREE_NAME();
 591     }
 592     msg_Err( p_demux, "unexpected end of xml data" );
 593     FREE_ATT();
 594     return VLC_FALSE;
 595 }
 596
 597 /**
 598  * \brief handles the supported <track> sub-elements
 599  */
 600 static vlc_bool_t set_item_info SIMPLE_INTERFACE
 601 {
 602     /* exit if setting is impossible */
 603     if( !psz_name || !psz_value || !p_input )
 604         return VLC_FALSE;
 605
 606
 607     /* re-convert xml special characters inside psz_value */
 608     resolve_xml_special_chars( psz_value );
 609
 610     /* handle each info element in a separate "if" clause */
 611     if( !strcmp( psz_name, "title" ) )
 612     {
 613         input_item_SetTitle( p_input, psz_value );
 614     }
 615     else if( !strcmp( psz_name, "creator" ) )
 616     {
 617         input_item_SetArtist( p_input, psz_value );
 618     }
 619     else if( !strcmp( psz_name, "album" ) )
 620     {
 621         input_item_SetAlbum( p_input, psz_value );
 622
 623     }
 624     else if( !strcmp( psz_name, "trackNum" ) )
 625     {
 626         input_item_SetTrackNum( p_input, psz_value );
 627     }
 628     else if( !strcmp( psz_name, "duration" ) )
 629     {
 630         long i_num = atol( psz_value );
 631         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 632     }
 633     else if( !strcmp( psz_name, "annotation" ) )
 634     {
 635         input_item_SetDescription( p_input, psz_value );
 636     }
 637     else if( !strcmp( psz_name, "image" ) )
 638     {
 639         const char *psz_uri = decode_URI_duplicate( psz_value );
 640         input_item_SetArtURL( p_input, psz_uri );
 641         free( psz_uri );
 642     }
 643     return VLC_TRUE;
 644 }
 645
 646
 647 /**
 648  * \brief parse the extension node of a XSPF playlist
 649  */
 650 static vlc_bool_t parse_extension_node COMPLEX_INTERFACE
 651 {
 652     char *psz_name = NULL;
 653     char *psz_value = NULL;
 654     char *psz_title = NULL;
 655     char *psz_application = NULL;
 656     int i_node;
 657     xml_elem_hnd_t *p_handler = NULL;
 658
 659     xml_elem_hnd_t pl_elements[] =
 660         { {"node",  COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 661           {"item",  COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 662           {NULL,    UNKNOWN_CONTENT, {NULL} }
 663         };
 664
 665     /* read all extension node attributes */
 666     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 667     {
 668         psz_name = xml_ReaderName( p_xml_reader );
 669         psz_value = xml_ReaderValue( p_xml_reader );
 670         if( !psz_name || !psz_value )
 671         {
 672             msg_Err( p_demux, "invalid xml stream @ <node>" );
 673             FREE_ATT();
 674             return VLC_FALSE;
 675         }
 676         /* attribute: title */
 677         if( !strcmp( psz_name, "title" ) )
 678         {
 679             psz_title = unescape_URI_duplicate( psz_value );
 680         }
 681         /* extension attribute: application */
 682         else if( !strcmp( psz_name, "application" ) )
 683         {
 684             psz_application = strdup( psz_value );
 685         }
 686         /* unknown attribute */
 687         else
 688             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element, psz_name );
 689
 690         FREE_ATT();
 691     }
 692
 693     /* attribute title is mandatory except for <extension> */
 694     if( !strcmp( psz_element, "node" ) && !psz_title )
 695     {
 696         msg_Warn( p_demux, "<node> requires \"title\" attribute" );
 697         return VLC_FALSE;
 698     }
 699     free( psz_title );
 700
 701     if( !strcmp( psz_element, "extension" ) )
 702     {
 703         if( !psz_application )
 704         {
 705             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 706             return VLC_FALSE;
 707         }
 708         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 709         {
 710             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 711             free( psz_application );
 712             return VLC_FALSE;
 713         }
 714     }
 715     free( psz_application );
 716
 717     /* parse the child elements */
 718     while( xml_ReaderRead( p_xml_reader ) == 1 )
 719     {
 720         i_node = xml_ReaderNodeType( p_xml_reader );
 721         switch( i_node )
 722         {
 723             case XML_READER_NONE:
 724                 break;
 725             case XML_READER_STARTELEM:
 726                 /*  element start tag  */
 727                 psz_name = xml_ReaderName( p_xml_reader );
 728                 if( !psz_name || !*psz_name )
 729                 {
 730                     msg_Err( p_demux, "invalid xml stream" );
 731                     FREE_ATT();
 732                     return VLC_FALSE;
 733                 }
 734                 /* choose handler */
 735                 for( p_handler = pl_elements;
 736                      p_handler->name && strcmp( psz_name, p_handler->name );
 737                      p_handler++ );
 738                 if( !p_handler->name )
 739                 {
 740                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 741                     FREE_ATT();
 742                     return VLC_FALSE;
 743                 }
 744                 FREE_NAME();
 745                 /* complex content is parsed in a separate function */
 746                 if( p_handler->type == COMPLEX_CONTENT )
 747                 {
 748                     if( p_handler->pf_handler.cmplx( p_demux,
 749                                                      p_playlist,
 750                                                      p_input_item,
 751                                                      p_xml_reader,
 752                                                      p_handler->name ) )
 753                     {
 754                         p_handler = NULL;
 755                         FREE_ATT();
 756                     }
 757                     else
 758                     {
 759                         FREE_ATT();
 760                         return VLC_FALSE;
 761                     }
 762                 }
 763                 break;
 764
 765             case XML_READER_TEXT:
 766                 /* simple element content */
 767                 FREE_ATT();
 768                 psz_value = xml_ReaderValue( p_xml_reader );
 769                 if( !psz_value )
 770                 {
 771                     msg_Err( p_demux, "invalid xml stream" );
 772                     FREE_ATT();
 773                     return VLC_FALSE;
 774                 }
 775                 break;
 776
 777             case XML_READER_ENDELEM:
 778                 /* element end tag */
 779                 psz_name = xml_ReaderName( p_xml_reader );
 780                 if( !psz_name )
 781                 {
 782                     msg_Err( p_demux, "invalid xml stream" );
 783                     FREE_ATT();
 784                     return VLC_FALSE;
 785                 }
 786                 /* leave if the current parent node is terminated */
 787                 if( !strcmp( psz_name, psz_element ) )
 788                 {
 789                     FREE_ATT();
 790                     return VLC_TRUE;
 791                 }
 792                 /* there MUST have been a start tag for that element name */
 793                 if( !p_handler || !p_handler->name
 794                     || strcmp( p_handler->name, psz_name ))
 795                 {
 796                     msg_Err( p_demux, "there's no open element left for <%s>",
 797                              psz_name );
 798                     FREE_ATT();
 799                     return VLC_FALSE;
 800                 }
 801
 802                 if( p_handler->pf_handler.smpl )
 803                 {
 804                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 805                                                 psz_value );
 806                 }
 807                 FREE_ATT();
 808                 p_handler = NULL;
 809                 break;
 810
 811             default:
 812                 /* unknown/unexpected xml node */
 813                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 814                 FREE_ATT();
 815                 return VLC_FALSE;
 816         }
 817         FREE_NAME();
 818     }
 819     return VLC_FALSE;
 820 }
 821
 822 /**
 823  * \brief parse the extension item node of a XSPF playlist
 824  */
 825 static vlc_bool_t parse_extitem_node COMPLEX_INTERFACE
 826 {
 827     char *psz_name = NULL;
 828     char *psz_value = NULL;
 829     int i_href = -1;
 830
 831     /* read all extension item attributes */
 832     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 833     {
 834         psz_name = xml_ReaderName( p_xml_reader );
 835         psz_value = xml_ReaderValue( p_xml_reader );
 836         if( !psz_name || !psz_value )
 837         {
 838             msg_Err( p_demux, "invalid xml stream @ <item>" );
 839             FREE_ATT();
 840             return VLC_FALSE;
 841         }
 842         /* attribute: href */
 843         if( !strcmp( psz_name, "href" ) )
 844         {
 845             i_href = atoi( psz_value );
 846         }
 847         /* unknown attribute */
 848         else
 849             msg_Warn( p_demux, "invalid <item> attribute:\"%s\"", psz_name);
 850
 851         FREE_ATT();
 852     }
 853
 854     /* attribute href is mandatory */
 855     if( i_href < 0 )
 856     {
 857         msg_Warn( p_demux, "<item> requires \"href\" attribute" );
 858         return VLC_FALSE;
 859     }
 860
 861     if( i_href > p_demux->p_sys->i_tracklist_entries )
 862     {
 863         msg_Warn( p_demux, "invalid \"href\" attribute" );
 864         return VLC_FALSE;
 865     }
 866
 867     /* fix for #1293 - XTAG sends ENDELEM for self closing tag */
 868     /* (libxml sends NONE) */
 869     xml_ReaderRead( p_xml_reader );
 870
 871     return VLC_TRUE;
 872 }
 873
 874 /**
 875  * \brief skips complex element content that we can't manage
 876  */
 877 static vlc_bool_t skip_element COMPLEX_INTERFACE
 878 {
 879     char *psz_endname;
 880
 881     while( xml_ReaderRead( p_xml_reader ) == 1 )
 882     {
 883         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 884         {
 885             psz_endname = xml_ReaderName( p_xml_reader );
 886             if( !psz_endname )
 887                 return VLC_FALSE;
 888             if( !strcmp( psz_element, psz_endname ) )
 889             {
 890                 free( psz_endname );
 891                 return VLC_TRUE;
 892             }
 893             else
 894                 free( psz_endname );
 895         }
 896     }
 897     return VLC_FALSE;
 898 }