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,  {NULL} },
 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,  {NULL} },
 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         p_input->psz_name = strdup( (char*)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         p_input->i_duration = i_num*1000;
 632     }
 633     else if( !strcmp( psz_name, "annotation" ) )
 634     {
 635         input_item_SetDescription( p_input, psz_value );
 636     }
 637     return VLC_TRUE;
 638 }
 639
 640
 641 /**
 642  * \brief parse the extension node of a XSPF playlist
 643  */
 644 static vlc_bool_t parse_extension_node COMPLEX_INTERFACE
 645 {
 646     char *psz_name = NULL;
 647     char *psz_value = NULL;
 648     char *psz_title = NULL;
 649     int i_node;
 650     xml_elem_hnd_t *p_handler = NULL;
 651
 652     xml_elem_hnd_t pl_elements[] =
 653         { {"node",  COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 654           {"item",  COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 655           {NULL,    UNKNOWN_CONTENT, {NULL} }
 656         };
 657
 658     /* read all extension node attributes */
 659     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 660     {
 661         psz_name = xml_ReaderName( p_xml_reader );
 662         psz_value = xml_ReaderValue( p_xml_reader );
 663         if( !psz_name || !psz_value )
 664         {
 665             msg_Err( p_demux, "invalid xml stream @ <node>" );
 666             FREE_ATT();
 667             return VLC_FALSE;
 668         }
 669         /* attribute: title */
 670         if( !strcmp( psz_name, "title" ) )
 671         {
 672             psz_title = unescape_URI_duplicate( psz_value );
 673         }
 674         /* unknown attribute */
 675         else
 676             msg_Warn( p_demux, "invalid <node> attribute:\"%s\"", psz_name);
 677
 678         FREE_ATT();
 679     }
 680
 681     /* attribute title is mandatory except for <extension> */
 682     if( !strcmp( psz_element, "node" ) && !psz_title )
 683     {
 684         msg_Warn( p_demux, "<node> requires \"title\" attribute" );
 685         return VLC_FALSE;
 686     }
 687     if( psz_title ) free( psz_title );
 688
 689     /* parse the child elements */
 690     while( xml_ReaderRead( p_xml_reader ) == 1 )
 691     {
 692         i_node = xml_ReaderNodeType( p_xml_reader );
 693         switch( i_node )
 694         {
 695             case XML_READER_NONE:
 696                 break;
 697             case XML_READER_STARTELEM:
 698                 /*  element start tag  */
 699                 psz_name = xml_ReaderName( p_xml_reader );
 700                 if( !psz_name || !*psz_name )
 701                 {
 702                     msg_Err( p_demux, "invalid xml stream" );
 703                     FREE_ATT();
 704                     return VLC_FALSE;
 705                 }
 706                 /* choose handler */
 707                 for( p_handler = pl_elements;
 708                      p_handler->name && strcmp( psz_name, p_handler->name );
 709                      p_handler++ );
 710                 if( !p_handler->name )
 711                 {
 712                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 713                     FREE_ATT();
 714                     return VLC_FALSE;
 715                 }
 716                 FREE_NAME();
 717                 /* complex content is parsed in a separate function */
 718                 if( p_handler->type == COMPLEX_CONTENT )
 719                 {
 720                     if( p_handler->pf_handler.cmplx( p_demux,
 721                                                      p_playlist,
 722                                                      p_input_item,
 723                                                      p_xml_reader,
 724                                                      p_handler->name ) )
 725                     {
 726                         p_handler = NULL;
 727                         FREE_ATT();
 728                     }
 729                     else
 730                     {
 731                         FREE_ATT();
 732                         return VLC_FALSE;
 733                     }
 734                 }
 735                 break;
 736
 737             case XML_READER_TEXT:
 738                 /* simple element content */
 739                 FREE_ATT();
 740                 psz_value = xml_ReaderValue( p_xml_reader );
 741                 if( !psz_value )
 742                 {
 743                     msg_Err( p_demux, "invalid xml stream" );
 744                     FREE_ATT();
 745                     return VLC_FALSE;
 746                 }
 747                 break;
 748
 749             case XML_READER_ENDELEM:
 750                 /* element end tag */
 751                 psz_name = xml_ReaderName( p_xml_reader );
 752                 if( !psz_name )
 753                 {
 754                     msg_Err( p_demux, "invalid xml stream" );
 755                     FREE_ATT();
 756                     return VLC_FALSE;
 757                 }
 758                 /* leave if the current parent node is terminated */
 759                 if( !strcmp( psz_name, psz_element ) )
 760                 {
 761                     FREE_ATT();
 762                     return VLC_TRUE;
 763                 }
 764                 /* there MUST have been a start tag for that element name */
 765                 if( !p_handler || !p_handler->name
 766                     || strcmp( p_handler->name, psz_name ))
 767                 {
 768                     msg_Err( p_demux, "there's no open element left for <%s>",
 769                              psz_name );
 770                     FREE_ATT();
 771                     return VLC_FALSE;
 772                 }
 773
 774                 if( p_handler->pf_handler.smpl )
 775                 {
 776                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 777                                                 psz_value );
 778                 }
 779                 FREE_ATT();
 780                 p_handler = NULL;
 781                 break;
 782
 783             default:
 784                 /* unknown/unexpected xml node */
 785                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 786                 FREE_ATT();
 787                 return VLC_FALSE;
 788         }
 789         FREE_NAME();
 790     }
 791     return VLC_FALSE;
 792 }
 793
 794 /**
 795  * \brief parse the extension item node of a XSPF playlist
 796  */
 797 static vlc_bool_t parse_extitem_node COMPLEX_INTERFACE
 798 {
 799     char *psz_name = NULL;
 800     char *psz_value = NULL;
 801     int i_href = -1;
 802
 803     /* read all extension item attributes */
 804     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 805     {
 806         psz_name = xml_ReaderName( p_xml_reader );
 807         psz_value = xml_ReaderValue( p_xml_reader );
 808         if( !psz_name || !psz_value )
 809         {
 810             msg_Err( p_demux, "invalid xml stream @ <item>" );
 811             FREE_ATT();
 812             return VLC_FALSE;
 813         }
 814         /* attribute: href */
 815         if( !strcmp( psz_name, "href" ) )
 816         {
 817             i_href = atoi( psz_value );
 818         }
 819         /* unknown attribute */
 820         else
 821             msg_Warn( p_demux, "invalid <item> attribute:\"%s\"", psz_name);
 822
 823         FREE_ATT();
 824     }
 825
 826     /* attribute href is mandatory */
 827     if( i_href < 0 )
 828     {
 829         msg_Warn( p_demux, "<item> requires \"href\" attribute" );
 830         return VLC_FALSE;
 831     }
 832
 833     if( i_href > p_demux->p_sys->i_tracklist_entries )
 834     {
 835         msg_Warn( p_demux, "invalid \"href\" attribute" );
 836         return VLC_FALSE;
 837     }
 838     return VLC_TRUE;
 839 }
 840
 841 /**
 842  * \brief skips complex element content that we can't manage
 843  */
 844 static vlc_bool_t skip_element COMPLEX_INTERFACE
 845 {
 846     char *psz_endname;
 847
 848     while( xml_ReaderRead( p_xml_reader ) == 1 )
 849     {
 850         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 851         {
 852             psz_endname = xml_ReaderName( p_xml_reader );
 853             if( !psz_endname )
 854                 return VLC_FALSE;
 855             if( !strcmp( psz_element, psz_endname ) )
 856             {
 857                 free( psz_endname );
 858                 return VLC_TRUE;
 859             }
 860             else
 861                 free( psz_endname );
 862         }
 863     }
 864     return VLC_FALSE;
 865 }