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 "xspf.h"
  37
  38 struct demux_sys_t
  39 {
  40     playlist_item_t *p_item_in_category;
  41     int i_parent_id;
  42     input_item_t **pp_tracklist;
  43     int i_tracklist_entries;
  44     int i_identifier;
  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_(xspf_import_Activate)( 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 /**
  61  * \brief demuxer function for XSPF parsing
  62  */
  63 int Demux( demux_t *p_demux )
  64 {
  65     int i_ret = VLC_SUCCESS;
  66     xml_t *p_xml = NULL;
  67     xml_reader_t *p_xml_reader = NULL;
  68     char *psz_name = NULL;
  69     INIT_PLAYLIST_STUFF;
  70     p_demux->p_sys->p_item_in_category = p_item_in_category;
  71     p_demux->p_sys->i_parent_id = i_parent_id;
  72     p_demux->p_sys->pp_tracklist = NULL;
  73     p_demux->p_sys->i_tracklist_entries = 0;
  74     p_demux->p_sys->i_identifier = -1;
  75
  76     /* create new xml parser from stream */
  77     p_xml = xml_Create( p_demux );
  78     if( !p_xml )
  79         i_ret = VLC_ENOMOD;
  80     else
  81     {
  82         p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  83         if( !p_xml_reader )
  84             i_ret = VLC_EGENERIC;
  85     }
  86
  87     /* locating the root node */
  88     if( i_ret == VLC_SUCCESS )
  89     {
  90         do
  91         {
  92             if( xml_ReaderRead( p_xml_reader ) != 1 )
  93             {
  94                 msg_Err( p_demux, "can't read xml stream" );
  95                 i_ret = VLC_EGENERIC;
  96             }
  97         } while( i_ret == VLC_SUCCESS &&
  98                  xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
  99     }
 100     /* checking root node name */
 101     if( i_ret == VLC_SUCCESS )
 102     {
 103         psz_name = xml_ReaderName( p_xml_reader );
 104         if( !psz_name || strcmp( psz_name, "playlist" ) )
 105         {
 106             msg_Err( p_demux, "invalid root node name: %s", psz_name );
 107             i_ret = VLC_EGENERIC;
 108         }
 109         FREE_NAME();
 110     }
 111
 112     i_ret = parse_playlist_node( p_demux, p_playlist, p_current, NULL,
 113                                  p_xml_reader, "playlist" );
 114     HANDLE_PLAY_AND_RELEASE;
 115     if( p_xml_reader )
 116         xml_ReaderDelete( p_xml, p_xml_reader );
 117     if( p_xml )
 118         xml_Delete( p_xml );
 119
 120     return i_ret;
 121     return 0;
 122 }
 123
 124 /** \brief dummy function for demux callback interface */
 125 static int Control( demux_t *p_demux, int i_query, va_list args )
 126 {
 127     return VLC_EGENERIC;
 128 }
 129
 130 /**
 131  * \brief parse the root node of a XSPF playlist
 132  * \param p_demux demuxer instance
 133  * \param p_playlist playlist instance
 134  * \param p_item current playlist item
 135  * \param p_input current input item
 136  * \param p_xml_reader xml reader instance
 137  * \param psz_element name of element to parse
 138  */
 139 static vlc_bool_t parse_playlist_node COMPLEX_INTERFACE
 140 {
 141     char *psz_name=NULL;
 142     char *psz_value=NULL;
 143     vlc_bool_t b_version_found = VLC_FALSE;
 144     int i_node;
 145     xml_elem_hnd_t *p_handler=NULL;
 146
 147     xml_elem_hnd_t pl_elements[] =
 148         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 149           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 150           {"annotation",   SIMPLE_CONTENT,  {NULL} },
 151           {"info",         SIMPLE_CONTENT,  {NULL} },
 152           {"location",     SIMPLE_CONTENT,  {NULL} },
 153           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 154           {"image",        SIMPLE_CONTENT,  {NULL} },
 155           {"date",         SIMPLE_CONTENT,  {NULL} },
 156           {"license",      SIMPLE_CONTENT,  {NULL} },
 157           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 158           {"link",         SIMPLE_CONTENT,  {NULL} },
 159           {"meta",         SIMPLE_CONTENT,  {NULL} },
 160           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 161           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 162           {NULL,           UNKNOWN_CONTENT, {NULL} }
 163         };
 164
 165     /* read all playlist attributes */
 166     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 167     {
 168         psz_name = xml_ReaderName( p_xml_reader );
 169         psz_value = xml_ReaderValue( p_xml_reader );
 170         if( !psz_name || !psz_value )
 171         {
 172             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 173             FREE_ATT();
 174             return VLC_FALSE;
 175         }
 176         /* attribute: version */
 177         if( !strcmp( psz_name, "version" ) )
 178        {
 179             b_version_found = VLC_TRUE;
 180             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 181                 msg_Warn( p_demux, "unsupported XSPF version" );
 182         }
 183         /* attribute: xmlns */
 184         else if( !strcmp( psz_name, "xmlns" ) )
 185             ;
 186         /* unknown attribute */
 187         else
 188             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 189
 190         FREE_ATT();
 191     }
 192     /* attribute version is mandatory !!! */
 193     if( !b_version_found )
 194         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 195
 196     /* parse the child elements - we only take care of <trackList> */
 197     while( xml_ReaderRead( p_xml_reader ) == 1 )
 198     {
 199         i_node = xml_ReaderNodeType( p_xml_reader );
 200         switch( i_node )
 201         {
 202             case XML_READER_NONE:
 203                 break;
 204             case XML_READER_STARTELEM:
 205                 /*  element start tag  */
 206                 psz_name = xml_ReaderName( p_xml_reader );
 207                 if( !psz_name || !*psz_name )
 208                 {
 209                     msg_Err( p_demux, "invalid xml stream" );
 210                     FREE_ATT();
 211                     return VLC_FALSE;
 212                 }
 213                 /* choose handler */
 214                 for( p_handler = pl_elements;
 215                      p_handler->name && strcmp( psz_name, p_handler->name );
 216                      p_handler++ );
 217                 if( !p_handler->name )
 218                 {
 219                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 220                     FREE_ATT();
 221                     return VLC_FALSE;
 222                 }
 223                 FREE_NAME();
 224                 /* complex content is parsed in a separate function */
 225                 if( p_handler->type == COMPLEX_CONTENT )
 226                 {
 227                     if( p_handler->pf_handler.cmplx( p_demux,
 228                                                      p_playlist,
 229                                                      p_item,NULL,
 230                                                      p_xml_reader,
 231                                                      p_handler->name ) )
 232                     {
 233                         p_handler = NULL;
 234                         FREE_ATT();
 235                     }
 236                     else
 237                     {
 238                         FREE_ATT();
 239                         return VLC_FALSE;
 240                     }
 241                 }
 242                 break;
 243
 244             case XML_READER_TEXT:
 245                 /* simple element content */
 246                 FREE_ATT();
 247                 psz_value = xml_ReaderValue( p_xml_reader );
 248                 if( !psz_value )
 249                 {
 250                     msg_Err( p_demux, "invalid xml stream" );
 251                     FREE_ATT();
 252                     return VLC_FALSE;
 253                 }
 254                 break;
 255
 256             case XML_READER_ENDELEM:
 257                 /* element end tag */
 258                 psz_name = xml_ReaderName( p_xml_reader );
 259                 if( !psz_name )
 260                 {
 261                     msg_Err( p_demux, "invalid xml stream" );
 262                     FREE_ATT();
 263                     return VLC_FALSE;
 264                 }
 265                 /* leave if the current parent node <playlist> is terminated */
 266                 if( !strcmp( psz_name, psz_element ) )
 267                 {
 268                     FREE_ATT();
 269                     return VLC_TRUE;
 270                 }
 271                 /* there MUST have been a start tag for that element name */
 272                 if( !p_handler || !p_handler->name
 273                     || strcmp( p_handler->name, psz_name ))
 274                 {
 275                     msg_Err( p_demux, "there's no open element left for <%s>",
 276                              psz_name );
 277                     FREE_ATT();
 278                     return VLC_FALSE;
 279                 }
 280
 281                 if( p_handler->pf_handler.smpl )
 282                 {
 283                     p_handler->pf_handler.smpl( p_item, NULL, p_handler->name,
 284                                                 psz_value );
 285                 }
 286                 FREE_ATT();
 287                 p_handler = NULL;
 288                 break;
 289
 290             default:
 291                 /* unknown/unexpected xml node */
 292                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 293                 FREE_ATT();
 294                 return VLC_FALSE;
 295         }
 296         FREE_NAME();
 297     }
 298     return VLC_FALSE;
 299 }
 300
 301 /**
 302  * \brief parses the tracklist node which only may contain <track>s
 303  */
 304 static vlc_bool_t parse_tracklist_node COMPLEX_INTERFACE
 305 {
 306     char *psz_name=NULL;
 307     int i_node;
 308     int i_ntracks = 0;
 309
 310     /* now parse the <track>s */
 311     while( xml_ReaderRead( p_xml_reader ) == 1 )
 312     {
 313         i_node = xml_ReaderNodeType( p_xml_reader );
 314         if( i_node == XML_READER_STARTELEM )
 315         {
 316             psz_name = xml_ReaderName( p_xml_reader );
 317             if( !psz_name )
 318             {
 319                 msg_Err( p_demux, "unexpected end of xml data" );
 320                 FREE_NAME();
 321                 return VLC_FALSE;
 322             }
 323             if( strcmp( psz_name, "track") )
 324             {
 325                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 326                          psz_name );
 327                 FREE_NAME();
 328                 return VLC_FALSE;
 329             }
 330             FREE_NAME();
 331
 332             /* parse the track data in a separate function */
 333             if( parse_track_node( p_demux, p_playlist, p_item, NULL,
 334                                    p_xml_reader,"track" ) == VLC_TRUE )
 335                 i_ntracks++;
 336         }
 337         else if( i_node == XML_READER_ENDELEM )
 338             break;
 339     }
 340
 341     /* the <trackList> has to be terminated */
 342     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 343     {
 344         msg_Err( p_demux, "there's a missing </trackList>" );
 345         FREE_NAME();
 346         return VLC_FALSE;
 347     }
 348     psz_name = xml_ReaderName( p_xml_reader );
 349     if( !psz_name || strcmp( psz_name, "trackList" ) )
 350     {
 351         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 352         FREE_NAME();
 353         return VLC_FALSE;
 354     }
 355     FREE_NAME();
 356
 357     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 358
 359     return VLC_TRUE;
 360 }
 361
 362 /**
 363  * \brief parse one track element
 364  * \param COMPLEX_INTERFACE
 365  */
 366 static vlc_bool_t parse_track_node COMPLEX_INTERFACE
 367 {
 368     input_item_t *p_new_input = NULL;
 369     int i_node;
 370     char *psz_name=NULL;
 371     char *psz_value=NULL;
 372     xml_elem_hnd_t *p_handler=NULL;
 373
 374     xml_elem_hnd_t track_elements[] =
 375         { {"location",     SIMPLE_CONTENT,  {NULL} },
 376           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 377           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 378           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 379           {"annotation",   SIMPLE_CONTENT,  {NULL} },
 380           {"info",         SIMPLE_CONTENT,  {NULL} },
 381           {"image",        SIMPLE_CONTENT,  {NULL} },
 382           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 383           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 384           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 385           {"link",         SIMPLE_CONTENT,  {NULL} },
 386           {"meta",         SIMPLE_CONTENT,  {NULL} },
 387           {"extension",    COMPLEX_CONTENT, {.cmplx = skip_element} },
 388           {NULL,           UNKNOWN_CONTENT, {NULL} }
 389         };
 390
 391     while( xml_ReaderRead( p_xml_reader ) == 1 )
 392     {
 393         i_node = xml_ReaderNodeType( p_xml_reader );
 394         switch( i_node )
 395         {
 396             case XML_READER_NONE:
 397                 break;
 398
 399             case XML_READER_STARTELEM:
 400                 /*  element start tag  */
 401                 psz_name = xml_ReaderName( p_xml_reader );
 402                 if( !psz_name || !*psz_name )
 403                 {
 404                     msg_Err( p_demux, "invalid xml stream" );
 405                     FREE_ATT();
 406                     return VLC_FALSE;
 407                 }
 408                 /* choose handler */
 409                 for( p_handler = track_elements;
 410                      p_handler->name && strcmp( psz_name, p_handler->name );
 411                      p_handler++ );
 412                 if( !p_handler->name )
 413                 {
 414                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 415                     FREE_ATT();
 416                     return VLC_FALSE;
 417                 }
 418                 FREE_NAME();
 419                 /* complex content is parsed in a separate function */
 420                 if( p_handler->type == COMPLEX_CONTENT )
 421                 {
 422                     if( !p_new_input )
 423                     {
 424                         msg_Err( p_demux,
 425                                  "at <%s> level no new item has been allocated",
 426                                  p_handler->name );
 427                         FREE_ATT();
 428                         return VLC_FALSE;
 429                     }
 430                     if( p_handler->pf_handler.cmplx( p_demux,
 431                                                      p_playlist,
 432                                                      NULL, p_new_input,
 433                                                      p_xml_reader,
 434                                                      p_handler->name ) )
 435                     {
 436                         p_handler = NULL;
 437                         FREE_ATT();
 438                     }
 439                     else
 440                     {
 441                         FREE_ATT();
 442                         return VLC_FALSE;
 443                     }
 444                 }
 445                 break;
 446
 447             case XML_READER_TEXT:
 448                 /* simple element content */
 449                 FREE_ATT();
 450                 psz_value = xml_ReaderValue( p_xml_reader );
 451                 if( !psz_value )
 452                 {
 453                     msg_Err( p_demux, "invalid xml stream" );
 454                     FREE_ATT();
 455                     return VLC_FALSE;
 456                 }
 457                 break;
 458
 459             case XML_READER_ENDELEM:
 460                 /* element end tag */
 461                 psz_name = xml_ReaderName( p_xml_reader );
 462                 if( !psz_name )
 463                 {
 464                     msg_Err( p_demux, "invalid xml stream" );
 465                     FREE_ATT();
 466                     return VLC_FALSE;
 467                 }
 468                 /* leave if the current parent node <track> is terminated */
 469                 if( !strcmp( psz_name, psz_element ) )
 470                 {
 471                     FREE_ATT();
 472                     /* Add it */
 473                     playlist_AddWhereverNeeded( p_playlist, p_new_input,
 474                               p_item, p_demux->p_sys->p_item_in_category,
 475                               (p_demux->p_sys->i_parent_id >0 ) ? VLC_TRUE:
 476                               VLC_FALSE, PLAYLIST_APPEND );
 477                     if( p_demux->p_sys->i_identifier <
 478                         p_demux->p_sys->i_tracklist_entries )
 479                     {
 480                         p_demux->p_sys->pp_tracklist[
 481                             p_demux->p_sys->i_identifier ] = p_new_input;
 482                     }
 483                     else
 484                     {
 485                         if( p_demux->p_sys->i_identifier >
 486                             p_demux->p_sys->i_tracklist_entries )
 487                         {
 488                             p_demux->p_sys->i_tracklist_entries =
 489                                 p_demux->p_sys->i_identifier;
 490                         }
 491                         INSERT_ELEM( p_demux->p_sys->pp_tracklist,
 492                                      p_demux->p_sys->i_tracklist_entries,
 493                                      p_demux->p_sys->i_tracklist_entries,
 494                                      p_new_input );
 495                     }
 496                     return VLC_TRUE;
 497                 }
 498                 /* there MUST have been a start tag for that element name */
 499                 if( !p_handler || !p_handler->name
 500                     || strcmp( p_handler->name, psz_name ))
 501                 {
 502                     msg_Err( p_demux, "there's no open element left for <%s>",
 503                              psz_name );
 504                     FREE_ATT();
 505                     return VLC_FALSE;
 506                 }
 507
 508                 /* special case: location */
 509                 if( !strcmp( p_handler->name, "location" ) )
 510                 {
 511                     char *psz_uri=NULL;
 512                     /* there MUST NOT be an item */
 513                     if( p_new_input )
 514                     {
 515                         msg_Err( p_demux, "item <%s> already created",
 516                                  psz_name );
 517                         FREE_ATT();
 518                         return VLC_FALSE;
 519                     }
 520                     psz_uri = unescape_URI_duplicate( psz_value );
 521
 522                     if( psz_uri )
 523                     {
 524                         p_new_input = input_ItemNewExt( p_playlist, psz_uri,
 525                                                         NULL, 0, NULL, -1 );
 526                         p_new_input->p_meta = vlc_meta_New();
 527                         free( psz_uri );
 528                         vlc_input_item_CopyOptions( p_item->p_input, p_new_input );
 529                         psz_uri = NULL;
 530                         FREE_ATT();
 531                         p_handler = NULL;
 532                     }
 533                     else
 534                     {
 535                         FREE_ATT();
 536                         return VLC_FALSE;
 537                     }
 538                 }
 539                 else if( !strcmp( p_handler->name, "identifier" ) )
 540                 {
 541                     p_demux->p_sys->i_identifier = atoi( psz_value );
 542                 }
 543                 else
 544                 {
 545                     /* there MUST be an item */
 546                     if( !p_new_input )
 547                     {
 548                         msg_Err( p_demux, "item not yet created at <%s>",
 549                                  psz_name );
 550                         FREE_ATT();
 551                         return VLC_FALSE;
 552                     }
 553                     if( p_handler->pf_handler.smpl )
 554                     {
 555                         p_handler->pf_handler.smpl( NULL, p_input,
 556                                                     p_handler->name,
 557                                                     psz_value );
 558                         FREE_ATT();
 559                     }
 560                 }
 561                 FREE_ATT();
 562                 p_handler = NULL;
 563                 break;
 564
 565             default:
 566                 /* unknown/unexpected xml node */
 567                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 568                 FREE_ATT();
 569                 return VLC_FALSE;
 570         }
 571         FREE_NAME();
 572     }
 573     msg_Err( p_demux, "unexpected end of xml data" );
 574     FREE_ATT();
 575     return VLC_FALSE;
 576 }
 577
 578 /**
 579  * \brief handles the supported <track> sub-elements
 580  */
 581 static vlc_bool_t set_item_info SIMPLE_INTERFACE
 582 {
 583     /* exit if setting is impossible */
 584     if( !psz_name || !psz_value || !p_input )
 585         return VLC_FALSE;
 586
 587     /* re-convert xml special characters inside psz_value */
 588     resolve_xml_special_chars( psz_value );
 589
 590     /* handle each info element in a separate "if" clause */
 591     if( !strcmp( psz_name, "title" ) )
 592     {
 593         p_input->psz_name = strdup( (char*)psz_value );
 594     }
 595     else if( !strcmp( psz_name, "creator" ) )
 596     {
 597         vlc_meta_SetArtist( p_input->p_meta, psz_value );
 598     }
 599     else if( !strcmp( psz_name, "album" ) )
 600     {
 601         vlc_meta_SetAlbum( p_input->p_meta, psz_value );
 602
 603     }
 604     else if( !strcmp( psz_name, "trackNum" ) )
 605     {
 606         vlc_meta_SetTracknum( p_input->p_meta, psz_value );
 607     }
 608     else if( !strcmp( psz_name, "duration" ) )
 609     {
 610         long i_num = atol( psz_value );
 611         p_input->i_duration = i_num*1000;
 612     }
 613     return VLC_TRUE;
 614 }
 615
 616
 617 /**
 618  * \brief parse the extension node of a XSPF playlist
 619  */
 620 static vlc_bool_t parse_extension_node COMPLEX_INTERFACE
 621 {
 622     char *psz_name = NULL;
 623     char *psz_value = NULL;
 624     char *psz_title = NULL;
 625     int i_node;
 626     xml_elem_hnd_t *p_handler = NULL;
 627
 628     xml_elem_hnd_t pl_elements[] =
 629         { {"node",  COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 630           {"item",  COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 631           {NULL,    UNKNOWN_CONTENT, {NULL} }
 632         };
 633
 634     /* read all extension node attributes */
 635     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 636     {
 637         psz_name = xml_ReaderName( p_xml_reader );
 638         psz_value = xml_ReaderValue( p_xml_reader );
 639         if( !psz_name || !psz_value )
 640         {
 641             msg_Err( p_demux, "invalid xml stream @ <node>" );
 642             FREE_ATT();
 643             return VLC_FALSE;
 644         }
 645         /* attribute: title */
 646         if( !strcmp( psz_name, "title" ) )
 647         {
 648             psz_title = unescape_URI_duplicate( psz_value );
 649         }
 650         /* unknown attribute */
 651         else
 652             msg_Warn( p_demux, "invalid <node> attribute:\"%s\"", psz_name);
 653
 654         FREE_ATT();
 655     }
 656
 657     /* attribute title is mandatory except for <extension> */
 658     if( !strcmp( psz_element, "node" ) && !psz_title )
 659     {
 660         msg_Warn( p_demux, "<node> requires \"title\" attribute" );
 661         return VLC_FALSE;
 662     }
 663
 664     if( !strcmp( psz_element, "node" ) )
 665     {
 666         fprintf( stderr, "  node: %s\n", psz_title );
 667     }
 668     if( psz_title ) free( psz_title );
 669
 670     /* parse the child elements */
 671     while( xml_ReaderRead( p_xml_reader ) == 1 )
 672     {
 673         i_node = xml_ReaderNodeType( p_xml_reader );
 674         switch( i_node )
 675         {
 676             case XML_READER_NONE:
 677                 break;
 678             case XML_READER_STARTELEM:
 679                 /*  element start tag  */
 680                 psz_name = xml_ReaderName( p_xml_reader );
 681                 if( !psz_name || !*psz_name )
 682                 {
 683                     msg_Err( p_demux, "invalid xml stream" );
 684                     FREE_ATT();
 685                     return VLC_FALSE;
 686                 }
 687                 /* choose handler */
 688                 for( p_handler = pl_elements;
 689                      p_handler->name && strcmp( psz_name, p_handler->name );
 690                      p_handler++ );
 691                 if( !p_handler->name )
 692                 {
 693                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 694                     FREE_ATT();
 695                     return VLC_FALSE;
 696                 }
 697                 FREE_NAME();
 698                 /* complex content is parsed in a separate function */
 699                 if( p_handler->type == COMPLEX_CONTENT )
 700                 {
 701                     if( p_handler->pf_handler.cmplx( p_demux,
 702                                                      p_playlist,
 703                                                      p_item, NULL,
 704                                                      p_xml_reader,
 705                                                      p_handler->name ) )
 706                     {
 707                         p_handler = NULL;
 708                         FREE_ATT();
 709                     }
 710                     else
 711                     {
 712                         FREE_ATT();
 713                         return VLC_FALSE;
 714                     }
 715                 }
 716                 break;
 717
 718             case XML_READER_TEXT:
 719                 /* simple element content */
 720                 FREE_ATT();
 721                 psz_value = xml_ReaderValue( p_xml_reader );
 722                 if( !psz_value )
 723                 {
 724                     msg_Err( p_demux, "invalid xml stream" );
 725                     FREE_ATT();
 726                     return VLC_FALSE;
 727                 }
 728                 break;
 729
 730             case XML_READER_ENDELEM:
 731                 /* element end tag */
 732                 psz_name = xml_ReaderName( p_xml_reader );
 733                 if( !psz_name )
 734                 {
 735                     msg_Err( p_demux, "invalid xml stream" );
 736                     FREE_ATT();
 737                     return VLC_FALSE;
 738                 }
 739                 /* leave if the current parent node is terminated */
 740                 if( !strcmp( psz_name, psz_element ) )
 741                 {
 742                     fprintf( stderr, "  </node>\n" );
 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
 821     fprintf( stderr, "    %s\n", p_demux->p_sys->pp_tracklist[i_href]->psz_name );
 822
 823     return VLC_TRUE;
 824 }
 825
 826 /**
 827  * \brief skips complex element content that we can't manage
 828  */
 829 static vlc_bool_t skip_element COMPLEX_INTERFACE
 830 {
 831     char *psz_endname;
 832
 833     while( xml_ReaderRead( p_xml_reader ) == 1 )
 834     {
 835         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 836         {
 837             psz_endname = xml_ReaderName( p_xml_reader );
 838             if( !psz_endname )
 839                 return VLC_FALSE;
 840             if( !strcmp( psz_element, psz_endname ) )
 841             {
 842                 free( psz_endname );
 843                 return VLC_TRUE;
 844             }
 845             else
 846                 free( psz_endname );
 847         }
 848     }
 849     return VLC_FALSE;
 850 }