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 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_demux.h>
  35
  36 #include <vlc_xml.h>
  37 #include <vlc_strings.h>
  38 #include <vlc_url.h>
  39 #include "xspf.h"
  40 #include "playlist.h"
  41
  42 struct demux_sys_t
  43 {
  44     input_item_t **pp_tracklist;
  45     int i_tracklist_entries;
  46     int i_track_id;
  47     char * psz_base;
  48 };
  49
  50 static int Control( demux_t *, int, va_list );
  51 static int Demux( demux_t * );
  52
  53 /**
  54  * \brief XSPF submodule initialization function
  55  */
  56 int Import_xspf( vlc_object_t *p_this )
  57 {
  58     DEMUX_BY_EXTENSION_OR_FORCED_MSG( ".xspf", "xspf-open",
  59                                       "using XSPF playlist reader" );
  60     return VLC_SUCCESS;
  61 }
  62
  63 void Close_xspf( vlc_object_t *p_this )
  64 {
  65     demux_t *p_demux = (demux_t *)p_this;
  66     int i;
  67     for(i = 0; i < p_demux->p_sys->i_tracklist_entries; i++)
  68     {
  69         if(p_demux->p_sys->pp_tracklist[i])
  70             vlc_gc_decref( p_demux->p_sys->pp_tracklist[i] );
  71     }
  72     free( p_demux->p_sys->pp_tracklist );
  73     free( p_demux->p_sys->psz_base );
  74     free( p_demux->p_sys );
  75 }
  76
  77 /**
  78  * \brief demuxer function for XSPF parsing
  79  */
  80 int Demux( demux_t *p_demux )
  81 {
  82     int i_ret = -1;
  83     xml_t *p_xml = NULL;
  84     xml_reader_t *p_xml_reader = NULL;
  85     char *psz_name = NULL;
  86     INIT_PLAYLIST_STUFF;
  87     p_demux->p_sys->pp_tracklist = NULL;
  88     p_demux->p_sys->i_tracklist_entries = 0;
  89     p_demux->p_sys->i_track_id = -1;
  90     p_demux->p_sys->psz_base = NULL;
  91
  92     /* create new xml parser from stream */
  93     p_xml = xml_Create( p_demux );
  94     if( !p_xml )
  95         goto end;
  96
  97     p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  98     if( !p_xml_reader )
  99         goto end;
 100
 101     /* locating the root node */
 102     do
 103     {
 104         if( xml_ReaderRead( p_xml_reader ) != 1 )
 105         {
 106             msg_Err( p_demux, "can't read xml stream" );
 107             goto end;
 108         }
 109     } while( xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
 110
 111     /* checking root node name */
 112     psz_name = xml_ReaderName( p_xml_reader );
 113     if( !psz_name || strcmp( psz_name, "playlist" ) )
 114     {
 115         msg_Err( p_demux, "invalid root node name: %s", psz_name );
 116         goto end;
 117     }
 118     free( psz_name );
 119
 120     i_ret = parse_playlist_node( p_demux, p_current_input,
 121                                  p_xml_reader, "playlist" ) ? 0 : -1;
 122
 123     for( int i = 0 ; i < p_demux->p_sys->i_tracklist_entries ; i++ )
 124     {
 125         input_item_t *p_new_input = p_demux->p_sys->pp_tracklist[i];
 126         if( p_new_input )
 127         {
 128             input_item_AddSubItem( p_current_input, p_new_input );
 129         }
 130     }
 131
 132 end:
 133     HANDLE_PLAY_AND_RELEASE;
 134     if( p_xml_reader )
 135         xml_ReaderDelete( p_xml, p_xml_reader );
 136     if( p_xml )
 137         xml_Delete( p_xml );
 138     return i_ret; /* Needed for correct operation of go back */
 139 }
 140
 141 /** \brief dummy function for demux callback interface */
 142 static int Control( demux_t *p_demux, int i_query, va_list args )
 143 {
 144     VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
 145     return VLC_EGENERIC;
 146 }
 147
 148 /**
 149  * \brief parse the root node of a XSPF playlist
 150  * \param p_demux demuxer instance
 151  * \param p_input_item current input item
 152  * \param p_xml_reader xml reader instance
 153  * \param psz_element name of element to parse
 154  */
 155 static bool parse_playlist_node COMPLEX_INTERFACE
 156 {
 157     char *psz_name = NULL;
 158     char *psz_value = NULL;
 159     bool b_version_found = false;
 160     int i_node;
 161     xml_elem_hnd_t *p_handler = NULL;
 162
 163     xml_elem_hnd_t pl_elements[] =
 164         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 165           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 166           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 167           {"info",         SIMPLE_CONTENT,  {NULL} },
 168           {"location",     SIMPLE_CONTENT,  {NULL} },
 169           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 170           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 171           {"date",         SIMPLE_CONTENT,  {NULL} },
 172           {"license",      SIMPLE_CONTENT,  {NULL} },
 173           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 174           {"link",         SIMPLE_CONTENT,  {NULL} },
 175           {"meta",         SIMPLE_CONTENT,  {NULL} },
 176           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 177           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 178           {NULL,           UNKNOWN_CONTENT, {NULL} }
 179         };
 180
 181     /* read all playlist attributes */
 182     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 183     {
 184         psz_name = xml_ReaderName( p_xml_reader );
 185         psz_value = xml_ReaderValue( p_xml_reader );
 186         if( !psz_name || !psz_value )
 187         {
 188             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 189             free( psz_name );
 190             free( psz_value );
 191             return false;
 192         }
 193         /* attribute: version */
 194         if( !strcmp( psz_name, "version" ) )
 195         {
 196             b_version_found = true;
 197             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 198                 msg_Warn( p_demux, "unsupported XSPF version" );
 199         }
 200         /* attribute: xmlns */
 201         else if( !strcmp( psz_name, "xmlns" ) || !strcmp( psz_name, "xmlns:vlc" ) )
 202             ;
 203         else if( !strcmp( psz_name, "xml:base" ) )
 204         {
 205             p_demux->p_sys->psz_base = strdup( psz_value );
 206         }
 207         /* unknown attribute */
 208         else
 209             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 210
 211         FREE_ATT();
 212     }
 213     /* attribute version is mandatory !!! */
 214     if( !b_version_found )
 215         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 216
 217     /* parse the child elements - we only take care of <trackList> */
 218     while( xml_ReaderRead( p_xml_reader ) == 1 )
 219     {
 220         i_node = xml_ReaderNodeType( p_xml_reader );
 221         switch( i_node )
 222         {
 223             case XML_READER_NONE:
 224                 break;
 225             case XML_READER_STARTELEM:
 226                 /*  element start tag  */
 227                 psz_name = xml_ReaderName( p_xml_reader );
 228                 if( !psz_name || !*psz_name )
 229                 {
 230                     msg_Err( p_demux, "invalid xml stream" );
 231                     FREE_ATT();
 232                     return false;
 233                 }
 234                 /* choose handler */
 235                 for( p_handler = pl_elements;
 236                      p_handler->name && strcmp( psz_name, p_handler->name );
 237                      p_handler++ );
 238                 if( !p_handler->name )
 239                 {
 240                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 241                     FREE_ATT();
 242                     return false;
 243                 }
 244                 FREE_NAME();
 245                 /* complex content is parsed in a separate function */
 246                 if( p_handler->type == COMPLEX_CONTENT )
 247                 {
 248                     if( p_handler->pf_handler.cmplx( p_demux,
 249                                                      p_input_item,
 250                                                      p_xml_reader,
 251                                                      p_handler->name ) )
 252                     {
 253                         p_handler = NULL;
 254                         FREE_ATT();
 255                     }
 256                     else
 257                     {
 258                         FREE_ATT();
 259                         return false;
 260                     }
 261                 }
 262                 break;
 263
 264             case XML_READER_TEXT:
 265                 /* simple element content */
 266                 FREE_ATT();
 267                 psz_value = xml_ReaderValue( p_xml_reader );
 268                 if( !psz_value )
 269                 {
 270                     msg_Err( p_demux, "invalid xml stream" );
 271                     FREE_ATT();
 272                     return false;
 273                 }
 274                 break;
 275
 276             case XML_READER_ENDELEM:
 277                 /* element end tag */
 278                 psz_name = xml_ReaderName( p_xml_reader );
 279                 if( !psz_name )
 280                 {
 281                     msg_Err( p_demux, "invalid xml stream" );
 282                     FREE_ATT();
 283                     return false;
 284                 }
 285                 /* leave if the current parent node <playlist> is terminated */
 286                 if( !strcmp( psz_name, psz_element ) )
 287                 {
 288                     FREE_ATT();
 289                     return true;
 290                 }
 291                 /* there MUST have been a start tag for that element name */
 292                 if( !p_handler || !p_handler->name
 293                     || strcmp( p_handler->name, psz_name ))
 294                 {
 295                     msg_Err( p_demux, "there's no open element left for <%s>",
 296                              psz_name );
 297                     FREE_ATT();
 298                     return false;
 299                 }
 300
 301                 if( p_handler->pf_handler.smpl )
 302                 {
 303                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 304                                                 psz_value );
 305                 }
 306                 FREE_ATT();
 307                 p_handler = NULL;
 308                 break;
 309
 310             default:
 311                 /* unknown/unexpected xml node */
 312                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 313                 FREE_ATT();
 314                 return false;
 315         }
 316         FREE_NAME();
 317     }
 318     return false;
 319 }
 320
 321 /**
 322  * \brief parses the tracklist node which only may contain <track>s
 323  */
 324 static bool parse_tracklist_node COMPLEX_INTERFACE
 325 {
 326     VLC_UNUSED(psz_element);
 327     char *psz_name;
 328     int i_ntracks = 0;
 329
 330     /* now parse the <track>s */
 331     while( xml_ReaderRead( p_xml_reader ) == 1 )
 332     {
 333         int i_node = xml_ReaderNodeType( p_xml_reader );
 334         if( i_node == XML_READER_STARTELEM )
 335         {
 336             char *psz_eltname = xml_ReaderName( p_xml_reader );
 337             if( !psz_eltname )
 338             {
 339                 msg_Err( p_demux, "unexpected end of xml data" );
 340                 free( psz_eltname );
 341                 return false;
 342             }
 343             if( strcmp( psz_eltname, "track") )
 344             {
 345                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 346                          psz_eltname );
 347                 free( psz_eltname );
 348                 return false;
 349             }
 350             free( psz_eltname );
 351
 352             /* parse the track data in a separate function */
 353             if( parse_track_node( p_demux, p_input_item, p_xml_reader,
 354                                   "track" ) )
 355                 i_ntracks++;
 356         }
 357         else if( i_node == XML_READER_ENDELEM )
 358             break;
 359     }
 360
 361     /* the <trackList> has to be terminated */
 362     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 363     {
 364         msg_Err( p_demux, "there's a missing </trackList>" );
 365         return false;
 366     }
 367     psz_name = xml_ReaderName( p_xml_reader );
 368     if( !psz_name || strcmp( psz_name, "trackList" ) )
 369     {
 370         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 371         free( psz_name );
 372         return false;
 373     }
 374     free( psz_name );
 375
 376     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 377     return true;
 378 }
 379
 380 /**
 381  * \brief parse one track element
 382  * \param COMPLEX_INTERFACE
 383  */
 384 static bool parse_track_node COMPLEX_INTERFACE
 385 {
 386     int i_node;
 387     char *psz_name = NULL;
 388     char *psz_value = NULL;
 389     xml_elem_hnd_t *p_handler = NULL;
 390
 391     xml_elem_hnd_t track_elements[] =
 392         { {"location",     SIMPLE_CONTENT,  {NULL} },
 393           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 394           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 395           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 396           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 397           {"info",         SIMPLE_CONTENT,  {NULL} },
 398           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 399           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 400           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 401           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 402           {"link",         SIMPLE_CONTENT,  {NULL} },
 403           {"meta",         SIMPLE_CONTENT,  {NULL} },
 404           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 405           {NULL,           UNKNOWN_CONTENT, {NULL} }
 406         };
 407
 408     input_item_t *p_new_input = input_item_New( p_demux, NULL, NULL );
 409
 410     if( !p_new_input )
 411     {
 412         /* malloc has failed for input_item_New, so bailout early */
 413         return false;
 414     }
 415
 416     /* reset i_track_id */
 417     p_demux->p_sys->i_track_id = -1;
 418
 419     while( xml_ReaderRead( p_xml_reader ) == 1 )
 420     {
 421         i_node = xml_ReaderNodeType( p_xml_reader );
 422         switch( i_node )
 423         {
 424             case XML_READER_NONE:
 425                 break;
 426
 427             case XML_READER_STARTELEM:
 428                 /*  element start tag  */
 429                 psz_name = xml_ReaderName( p_xml_reader );
 430                 if( !psz_name || !*psz_name )
 431                 {
 432                     msg_Err( p_demux, "invalid xml stream" );
 433                     FREE_ATT();
 434                     return false;
 435                 }
 436                 /* choose handler */
 437                 for( p_handler = track_elements;
 438                      p_handler->name && strcmp( psz_name, p_handler->name );
 439                      p_handler++ );
 440                 if( !p_handler->name )
 441                 {
 442                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 443                     FREE_ATT();
 444                     return false;
 445                 }
 446                 FREE_NAME();
 447                 /* complex content is parsed in a separate function */
 448                 if( p_handler->type == COMPLEX_CONTENT )
 449                 {
 450                     if( !p_new_input )
 451                     {
 452                         msg_Err( p_demux,
 453                                  "at <%s> level no new item has been allocated",
 454                                  p_handler->name );
 455                         FREE_ATT();
 456                         return false;
 457                     }
 458                     if( p_handler->pf_handler.cmplx( p_demux,
 459                                                      p_new_input,
 460                                                      p_xml_reader,
 461                                                      p_handler->name ) )
 462                     {
 463                         p_handler = NULL;
 464                         FREE_ATT();
 465                     }
 466                     else
 467                     {
 468                         FREE_ATT();
 469                         return false;
 470                     }
 471                 }
 472                 break;
 473
 474             case XML_READER_TEXT:
 475                 /* simple element content */
 476                 FREE_ATT();
 477                 psz_value = xml_ReaderValue( p_xml_reader );
 478                 if( !psz_value )
 479                 {
 480                     msg_Err( p_demux, "invalid xml stream" );
 481                     FREE_ATT();
 482                     return false;
 483                 }
 484                 break;
 485
 486             case XML_READER_ENDELEM:
 487                 /* element end tag */
 488                 psz_name = xml_ReaderName( p_xml_reader );
 489                 if( !psz_name )
 490                 {
 491                     msg_Err( p_demux, "invalid xml stream" );
 492                     FREE_ATT();
 493                     return false;
 494                 }
 495
 496                 /* leave if the current parent node <track> is terminated */
 497                 if( !strcmp( psz_name, psz_element ) )
 498                 {
 499                     FREE_ATT();
 500
 501                     /* Make sure we have a URI */
 502                     char *psz_uri = input_item_GetURI( p_new_input );
 503                     if( !psz_uri )
 504                     {
 505                         input_item_SetURI( p_new_input, "vlc://nop" );
 506                     }
 507                     free( psz_uri );
 508
 509                     if( p_demux->p_sys->i_track_id < 0 )
 510                     {
 511                         input_item_AddSubItem( p_input_item, p_new_input );
 512                         vlc_gc_decref( p_new_input );
 513                         return true;
 514                     }
 515
 516                     if( p_demux->p_sys->i_track_id >=
 517                            p_demux->p_sys->i_tracklist_entries )
 518                     {
 519                         input_item_t **pp;
 520                         pp = realloc( p_demux->p_sys->pp_tracklist,
 521                             (p_demux->p_sys->i_track_id + 1) * sizeof(*pp) );
 522                         if( !pp )
 523                             return false;
 524                         p_demux->p_sys->pp_tracklist = pp;
 525                         while( p_demux->p_sys->i_track_id >=
 526                                p_demux->p_sys->i_tracklist_entries )
 527                             pp[p_demux->p_sys->i_tracklist_entries++] = NULL;
 528                     }
 529
 530                     p_demux->p_sys->pp_tracklist[
 531                             p_demux->p_sys->i_track_id ] = p_new_input;
 532                     return true;
 533                 }
 534                 /* there MUST have been a start tag for that element name */
 535                 if( !p_handler || !p_handler->name
 536                     || strcmp( p_handler->name, psz_name ))
 537                 {
 538                     msg_Err( p_demux, "there's no open element left for <%s>",
 539                              psz_name );
 540                     FREE_ATT();
 541                     return false;
 542                 }
 543
 544                 /* special case: location */
 545                 if( !strcmp( p_handler->name, "location" ) )
 546                 {
 547                     /* FIXME: This is broken. Scheme-relative (//...) locations
 548                      * and anchors (#...) are not resolved correctly. Also,
 549                      * host-relative (/...) and directory-relative locations
 550                      * ("relative path" in vernacular) should be resolved.
 551                      * Last, psz_base should default to the XSPF resource
 552                      * location if missing (not the current working directory).
 553                      * -- Courmisch */
 554                     if( p_demux->p_sys->psz_base && !strstr( psz_value, "://" ) )
 555                     {
 556                         char* psz_tmp;
 557                         if( asprintf( &psz_tmp, "%s%s",
 558                                 p_demux->p_sys->psz_base, psz_value ) == -1 )
 559                         {
 560                             FREE_ATT();
 561                             return NULL;
 562                         }
 563                         input_item_SetURI( p_new_input, psz_tmp );
 564                         free( psz_tmp );
 565                     }
 566                     else
 567                         input_item_SetURI( p_new_input, psz_value );
 568                     input_item_CopyOptions( p_input_item, p_new_input );
 569                     FREE_ATT();
 570                     p_handler = NULL;
 571                 }
 572                 else
 573                 {
 574                     /* there MUST be an item */
 575                     if( !p_new_input )
 576                     {
 577                         msg_Err( p_demux, "item not yet created at <%s>",
 578                                  psz_name );
 579                         FREE_ATT();
 580                         return false;
 581                     }
 582                     if( p_handler->pf_handler.smpl )
 583                     {
 584                         p_handler->pf_handler.smpl( p_new_input,
 585                                                     p_handler->name,
 586                                                     psz_value );
 587                         FREE_ATT();
 588                     }
 589                 }
 590                 FREE_ATT();
 591                 p_handler = NULL;
 592                 break;
 593
 594             default:
 595                 /* unknown/unexpected xml node */
 596                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 597                 FREE_ATT();
 598                 return false;
 599         }
 600         FREE_NAME();
 601     }
 602     msg_Err( p_demux, "unexpected end of xml data" );
 603     FREE_ATT();
 604     return false;
 605 }
 606
 607 /**
 608  * \brief handles the supported <track> sub-elements
 609  */
 610 static bool set_item_info SIMPLE_INTERFACE
 611 {
 612     /* exit if setting is impossible */
 613     if( !psz_name || !psz_value || !p_input )
 614         return false;
 615
 616     /* re-convert xml special characters inside psz_value */
 617     resolve_xml_special_chars( psz_value );
 618
 619     /* handle each info element in a separate "if" clause */
 620     if( !strcmp( psz_name, "title" ) )
 621     {
 622         input_item_SetTitle( p_input, psz_value );
 623     }
 624     else if( !strcmp( psz_name, "creator" ) )
 625     {
 626         input_item_SetArtist( p_input, psz_value );
 627     }
 628     else if( !strcmp( psz_name, "album" ) )
 629     {
 630         input_item_SetAlbum( p_input, psz_value );
 631
 632     }
 633     else if( !strcmp( psz_name, "trackNum" ) )
 634     {
 635         input_item_SetTrackNum( p_input, psz_value );
 636     }
 637     else if( !strcmp( psz_name, "duration" ) )
 638     {
 639         long i_num = atol( psz_value );
 640         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 641     }
 642     else if( !strcmp( psz_name, "annotation" ) )
 643     {
 644         input_item_SetDescription( p_input, psz_value );
 645     }
 646     else if( !strcmp( psz_name, "image" ) )
 647     {
 648         input_item_SetArtURL( p_input, psz_value );
 649     }
 650     return true;
 651 }
 652
 653 /**
 654  * \brief handles the <vlc:option> elements
 655  */
 656 static bool set_option SIMPLE_INTERFACE
 657 {
 658     /* exit if setting is impossible */
 659     if( !psz_name || !psz_value || !p_input )
 660         return false;
 661
 662     /* re-convert xml special characters inside psz_value */
 663     resolve_xml_special_chars( psz_value );
 664
 665     input_item_AddOption( p_input, psz_value, 0 );
 666
 667     return true;
 668 }
 669
 670 /**
 671  * \brief parse the extension node of a XSPF playlist
 672  */
 673 static bool parse_extension_node COMPLEX_INTERFACE
 674 {
 675     char *psz_name = NULL;
 676     char *psz_value = NULL;
 677     char *psz_title = NULL;
 678     char *psz_application = NULL;
 679     int i_node;
 680     bool b_release_input_item = false;
 681     xml_elem_hnd_t *p_handler = NULL;
 682     input_item_t *p_new_input = NULL;
 683
 684     xml_elem_hnd_t pl_elements[] =
 685         { {"vlc:node",   COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 686           {"vlc:item",   COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 687           {"vlc:id",     SIMPLE_CONTENT, {NULL} },
 688           {"vlc:option", SIMPLE_CONTENT, {.smpl = set_option} },
 689           {NULL,    UNKNOWN_CONTENT, {NULL} }
 690         };
 691
 692     /* read all extension node attributes */
 693     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 694     {
 695         psz_name = xml_ReaderName( p_xml_reader );
 696         psz_value = xml_ReaderValue( p_xml_reader );
 697         if( !psz_name || !psz_value )
 698         {
 699             msg_Err( p_demux, "invalid xml stream @ <vlc:node>" );
 700             FREE_ATT();
 701             return false;
 702         }
 703         /* attribute: title */
 704         if( !strcmp( psz_name, "title" ) )
 705         {
 706             resolve_xml_special_chars( psz_value );
 707             psz_title = psz_value;
 708         }
 709         /* extension attribute: application */
 710         else if( !strcmp( psz_name, "application" ) )
 711         {
 712             psz_application = psz_value;
 713         }
 714         /* unknown attribute */
 715         else
 716         {
 717             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element,
 718                       psz_name );
 719             FREE_VALUE();
 720         }
 721         FREE_NAME();
 722         psz_value = NULL;
 723     }
 724
 725     /* attribute title is mandatory except for <extension> */
 726     if( !strcmp( psz_element, "vlc:node" ) )
 727     {
 728         if( !psz_title )
 729         {
 730             msg_Warn( p_demux, "<vlc:node> requires \"title\" attribute" );
 731             return false;
 732         }
 733         p_new_input = input_item_NewWithType( VLC_OBJECT( p_demux ),
 734                           "vlc://nop", psz_title, 0, NULL, 0, -1,
 735                           ITEM_TYPE_DIRECTORY );
 736         if( p_new_input )
 737         {
 738             input_item_AddSubItem( p_input_item, p_new_input );
 739             p_input_item = p_new_input;
 740             b_release_input_item = true;
 741         }
 742         free( psz_title );
 743     }
 744     else if( !strcmp( psz_element, "extension" ) )
 745     {
 746         if( !psz_application )
 747         {
 748             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 749             return false;
 750         }
 751         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 752         {
 753             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 754             free( psz_application );
 755             return false;
 756         }
 757     }
 758     free( psz_application );
 759
 760     /* parse the child elements */
 761     while( xml_ReaderRead( p_xml_reader ) == 1 )
 762     {
 763         i_node = xml_ReaderNodeType( p_xml_reader );
 764         switch( i_node )
 765         {
 766             case XML_READER_NONE:
 767                 break;
 768             case XML_READER_STARTELEM:
 769                 /*  element start tag  */
 770                 psz_name = xml_ReaderName( p_xml_reader );
 771                 if( !psz_name || !*psz_name )
 772                 {
 773                     msg_Err( p_demux, "invalid xml stream" );
 774                     FREE_ATT();
 775                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 776                     return false;
 777                 }
 778                 /* choose handler */
 779                 for( p_handler = pl_elements;
 780                      p_handler->name && strcmp( psz_name, p_handler->name );
 781                      p_handler++ );
 782                 if( !p_handler->name )
 783                 {
 784                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 785                     FREE_ATT();
 786                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 787                     return false;
 788                 }
 789                 FREE_NAME();
 790                 /* complex content is parsed in a separate function */
 791                 if( p_handler->type == COMPLEX_CONTENT )
 792                 {
 793                     if( p_handler->pf_handler.cmplx( p_demux,
 794                                                      p_input_item,
 795                                                      p_xml_reader,
 796                                                      p_handler->name ) )
 797                     {
 798                         p_handler = NULL;
 799                         FREE_ATT();
 800                     }
 801                     else
 802                     {
 803                         FREE_ATT();
 804                         if( b_release_input_item ) vlc_gc_decref( p_new_input );
 805                         return false;
 806                     }
 807                 }
 808                 break;
 809
 810             case XML_READER_TEXT:
 811                 /* simple element content */
 812                 FREE_ATT();
 813                 psz_value = xml_ReaderValue( p_xml_reader );
 814                 if( !psz_value )
 815                 {
 816                     msg_Err( p_demux, "invalid xml stream" );
 817                     FREE_ATT();
 818                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 819                     return false;
 820                 }
 821                 break;
 822
 823             case XML_READER_ENDELEM:
 824                 /* element end tag */
 825                 psz_name = xml_ReaderName( p_xml_reader );
 826                 if( !psz_name )
 827                 {
 828                     msg_Err( p_demux, "invalid xml stream" );
 829                     FREE_ATT();
 830                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 831                     return false;
 832                 }
 833                 /* leave if the current parent node is terminated */
 834                 if( !strcmp( psz_name, psz_element ) )
 835                 {
 836                     FREE_ATT();
 837                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 838                     return true;
 839                 }
 840                 /* there MUST have been a start tag for that element name */
 841                 if( !p_handler || !p_handler->name
 842                     || strcmp( p_handler->name, psz_name ))
 843                 {
 844                     msg_Err( p_demux, "there's no open element left for <%s>",
 845                              psz_name );
 846                     FREE_ATT();
 847                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 848                     return false;
 849                 }
 850
 851                 /* special tag <vlc:id> */
 852                 if( !strcmp( p_handler->name, "vlc:id" ) )
 853                 {
 854                     p_demux->p_sys->i_track_id = atoi( psz_value );
 855                 }
 856                 else if( p_handler->pf_handler.smpl )
 857                 {
 858                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 859                                                 psz_value );
 860                 }
 861                 FREE_ATT();
 862                 p_handler = NULL;
 863                 break;
 864
 865             default:
 866                 /* unknown/unexpected xml node */
 867                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 868                 FREE_ATT();
 869                 if( b_release_input_item ) vlc_gc_decref( p_new_input );
 870                 return false;
 871         }
 872         FREE_NAME();
 873     }
 874     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 875     return false;
 876 }
 877
 878 /**
 879  * \brief parse the extension item node of a XSPF playlist
 880  */
 881 static bool parse_extitem_node COMPLEX_INTERFACE
 882 {
 883     VLC_UNUSED(psz_element);
 884     input_item_t *p_new_input = NULL;
 885     int i_tid = -1;
 886
 887     /* read all extension item attributes */
 888     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 889     {
 890         char *psz_name = xml_ReaderName( p_xml_reader );
 891         char *psz_value = xml_ReaderValue( p_xml_reader );
 892         if( !psz_name || !psz_value )
 893         {
 894             msg_Err( p_demux, "invalid xml stream @ <vlc:item>" );
 895             free( psz_name );
 896             free( psz_value );
 897             return false;
 898         }
 899         /* attribute: href */
 900         if( !strcmp( psz_name, "tid" ) )
 901         {
 902             i_tid = atoi( psz_value );
 903         }
 904         /* unknown attribute */
 905         else
 906             msg_Warn( p_demux, "invalid <vlc:item> attribute:\"%s\"", psz_name);
 907
 908         free( psz_name );
 909         free( psz_value );
 910     }
 911
 912     /* attribute href is mandatory */
 913     if( i_tid < 0 )
 914     {
 915         msg_Warn( p_demux, "<vlc:item> requires \"tid\" attribute" );
 916         return false;
 917     }
 918
 919     if( i_tid >= p_demux->p_sys->i_tracklist_entries )
 920     {
 921         msg_Warn( p_demux, "invalid \"tid\" attribute" );
 922         return false;
 923     }
 924
 925     p_new_input = p_demux->p_sys->pp_tracklist[ i_tid ];
 926     if( p_new_input )
 927     {
 928         input_item_AddSubItem( p_input_item, p_new_input );
 929         vlc_gc_decref( p_new_input );
 930         p_demux->p_sys->pp_tracklist[i_tid] = NULL;
 931     }
 932
 933     /* kludge for #1293 - XTAG sends ENDELEM for self closing tag */
 934     /* (libxml sends NONE) */
 935     xml_ReaderRead( p_xml_reader );
 936
 937     return true;
 938 }
 939
 940 /**
 941  * \brief skips complex element content that we can't manage
 942  */
 943 static bool skip_element COMPLEX_INTERFACE
 944 {
 945     VLC_UNUSED(p_demux); VLC_UNUSED(p_input_item);
 946
 947     while( xml_ReaderRead( p_xml_reader ) == 1 )
 948     {
 949         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 950         {
 951             char *psz_endname = xml_ReaderName( p_xml_reader );
 952             if( !psz_endname )
 953                 return false;
 954             if( !strcmp( psz_element, psz_endname ) )
 955             {
 956                 free( psz_endname );
 957                 return true;
 958             }
 959             else
 960                 free( psz_endname );
 961         }
 962     }
 963     return false;
 964 }