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         i_ret = -1;
  96     else
  97     {
  98         p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  99         if( !p_xml_reader )
 100             i_ret = -1;
 101     }
 102
 103     /* locating the root node */
 104     if( i_ret == 1 )
 105     {
 106         do
 107         {
 108             if( xml_ReaderRead( p_xml_reader ) != 1 )
 109             {
 110                 msg_Err( p_demux, "can't read xml stream" );
 111                 i_ret = -1;
 112             }
 113         } while( i_ret == VLC_SUCCESS &&
 114                  xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
 115     }
 116     /* checking root node name */
 117     if( i_ret == 1 )
 118     {
 119         psz_name = xml_ReaderName( p_xml_reader );
 120         if( !psz_name || strcmp( psz_name, "playlist" ) )
 121         {
 122             msg_Err( p_demux, "invalid root node name: %s", psz_name );
 123             i_ret = -1;
 124         }
 125         FREE_NAME();
 126     }
 127
 128     if( i_ret == 1 )
 129         i_ret = parse_playlist_node( p_demux, p_current_input,
 130                                      p_xml_reader, "playlist" ) ? 0 : -1;
 131
 132     int i;
 133     for( i = 0 ; i < p_demux->p_sys->i_tracklist_entries ; i++ )
 134     {
 135         input_item_t *p_new_input = p_demux->p_sys->pp_tracklist[i];
 136         if( p_new_input )
 137         {
 138             input_item_AddSubItem( p_current_input, p_new_input );
 139         }
 140     }
 141
 142     HANDLE_PLAY_AND_RELEASE;
 143     if( p_xml_reader )
 144         xml_ReaderDelete( p_xml, p_xml_reader );
 145     if( p_xml )
 146         xml_Delete( p_xml );
 147     return i_ret; /* Needed for correct operation of go back */
 148 }
 149
 150 /** \brief dummy function for demux callback interface */
 151 static int Control( demux_t *p_demux, int i_query, va_list args )
 152 {
 153     VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
 154     return VLC_EGENERIC;
 155 }
 156
 157 /**
 158  * \brief parse the root node of a XSPF playlist
 159  * \param p_demux demuxer instance
 160  * \param p_input_item current input item
 161  * \param p_xml_reader xml reader instance
 162  * \param psz_element name of element to parse
 163  */
 164 static bool parse_playlist_node COMPLEX_INTERFACE
 165 {
 166     char *psz_name = NULL;
 167     char *psz_value = NULL;
 168     bool b_version_found = false;
 169     int i_node;
 170     xml_elem_hnd_t *p_handler = NULL;
 171
 172     xml_elem_hnd_t pl_elements[] =
 173         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 174           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 175           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 176           {"info",         SIMPLE_CONTENT,  {NULL} },
 177           {"location",     SIMPLE_CONTENT,  {NULL} },
 178           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 179           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 180           {"date",         SIMPLE_CONTENT,  {NULL} },
 181           {"license",      SIMPLE_CONTENT,  {NULL} },
 182           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 183           {"link",         SIMPLE_CONTENT,  {NULL} },
 184           {"meta",         SIMPLE_CONTENT,  {NULL} },
 185           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 186           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 187           {NULL,           UNKNOWN_CONTENT, {NULL} }
 188         };
 189
 190     /* read all playlist attributes */
 191     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 192     {
 193         psz_name = xml_ReaderName( p_xml_reader );
 194         psz_value = xml_ReaderValue( p_xml_reader );
 195         if( !psz_name || !psz_value )
 196         {
 197             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 198             FREE_ATT();
 199             return false;
 200         }
 201         /* attribute: version */
 202         if( !strcmp( psz_name, "version" ) )
 203         {
 204             b_version_found = true;
 205             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 206                 msg_Warn( p_demux, "unsupported XSPF version" );
 207         }
 208         /* attribute: xmlns */
 209         else if( !strcmp( psz_name, "xmlns" ) || !strcmp( psz_name, "xmlns:vlc" ) )
 210             ;
 211         else if( !strcmp( psz_name, "xml:base" ) )
 212         {
 213             p_demux->p_sys->psz_base = decode_URI_duplicate( psz_value );
 214         }
 215         /* unknown attribute */
 216         else
 217             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 218
 219         FREE_ATT();
 220     }
 221     /* attribute version is mandatory !!! */
 222     if( !b_version_found )
 223         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 224
 225     /* parse the child elements - we only take care of <trackList> */
 226     while( xml_ReaderRead( p_xml_reader ) == 1 )
 227     {
 228         i_node = xml_ReaderNodeType( p_xml_reader );
 229         switch( i_node )
 230         {
 231             case XML_READER_NONE:
 232                 break;
 233             case XML_READER_STARTELEM:
 234                 /*  element start tag  */
 235                 psz_name = xml_ReaderName( p_xml_reader );
 236                 if( !psz_name || !*psz_name )
 237                 {
 238                     msg_Err( p_demux, "invalid xml stream" );
 239                     FREE_ATT();
 240                     return false;
 241                 }
 242                 /* choose handler */
 243                 for( p_handler = pl_elements;
 244                      p_handler->name && strcmp( psz_name, p_handler->name );
 245                      p_handler++ );
 246                 if( !p_handler->name )
 247                 {
 248                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 249                     FREE_ATT();
 250                     return false;
 251                 }
 252                 FREE_NAME();
 253                 /* complex content is parsed in a separate function */
 254                 if( p_handler->type == COMPLEX_CONTENT )
 255                 {
 256                     if( p_handler->pf_handler.cmplx( p_demux,
 257                                                      p_input_item,
 258                                                      p_xml_reader,
 259                                                      p_handler->name ) )
 260                     {
 261                         p_handler = NULL;
 262                         FREE_ATT();
 263                     }
 264                     else
 265                     {
 266                         FREE_ATT();
 267                         return false;
 268                     }
 269                 }
 270                 break;
 271
 272             case XML_READER_TEXT:
 273                 /* simple element content */
 274                 FREE_ATT();
 275                 psz_value = xml_ReaderValue( p_xml_reader );
 276                 if( !psz_value )
 277                 {
 278                     msg_Err( p_demux, "invalid xml stream" );
 279                     FREE_ATT();
 280                     return false;
 281                 }
 282                 break;
 283
 284             case XML_READER_ENDELEM:
 285                 /* element end tag */
 286                 psz_name = xml_ReaderName( p_xml_reader );
 287                 if( !psz_name )
 288                 {
 289                     msg_Err( p_demux, "invalid xml stream" );
 290                     FREE_ATT();
 291                     return false;
 292                 }
 293                 /* leave if the current parent node <playlist> is terminated */
 294                 if( !strcmp( psz_name, psz_element ) )
 295                 {
 296                     FREE_ATT();
 297                     return true;
 298                 }
 299                 /* there MUST have been a start tag for that element name */
 300                 if( !p_handler || !p_handler->name
 301                     || strcmp( p_handler->name, psz_name ))
 302                 {
 303                     msg_Err( p_demux, "there's no open element left for <%s>",
 304                              psz_name );
 305                     FREE_ATT();
 306                     return false;
 307                 }
 308
 309                 if( p_handler->pf_handler.smpl )
 310                 {
 311                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 312                                                 psz_value );
 313                 }
 314                 FREE_ATT();
 315                 p_handler = NULL;
 316                 break;
 317
 318             default:
 319                 /* unknown/unexpected xml node */
 320                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 321                 FREE_ATT();
 322                 return false;
 323         }
 324         FREE_NAME();
 325     }
 326     return false;
 327 }
 328
 329 /**
 330  * \brief parses the tracklist node which only may contain <track>s
 331  */
 332 static bool parse_tracklist_node COMPLEX_INTERFACE
 333 {
 334     VLC_UNUSED(psz_element);
 335     char *psz_name = NULL;
 336     int i_node;
 337     int i_ntracks = 0;
 338
 339     /* now parse the <track>s */
 340     while( xml_ReaderRead( p_xml_reader ) == 1 )
 341     {
 342         i_node = xml_ReaderNodeType( p_xml_reader );
 343         if( i_node == XML_READER_STARTELEM )
 344         {
 345             psz_name = xml_ReaderName( p_xml_reader );
 346             if( !psz_name )
 347             {
 348                 msg_Err( p_demux, "unexpected end of xml data" );
 349                 FREE_NAME();
 350                 return false;
 351             }
 352             if( strcmp( psz_name, "track") )
 353             {
 354                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 355                          psz_name );
 356                 FREE_NAME();
 357                 return false;
 358             }
 359             FREE_NAME();
 360
 361             /* parse the track data in a separate function */
 362             if( parse_track_node( p_demux, p_input_item,
 363                                    p_xml_reader,"track" ) == true )
 364                 i_ntracks++;
 365         }
 366         else if( i_node == XML_READER_ENDELEM )
 367             break;
 368     }
 369
 370     /* the <trackList> has to be terminated */
 371     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 372     {
 373         msg_Err( p_demux, "there's a missing </trackList>" );
 374         FREE_NAME();
 375         return false;
 376     }
 377     psz_name = xml_ReaderName( p_xml_reader );
 378     if( !psz_name || strcmp( psz_name, "trackList" ) )
 379     {
 380         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 381         FREE_NAME();
 382         return false;
 383     }
 384     FREE_NAME();
 385
 386     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 387
 388     return true;
 389 }
 390
 391 /**
 392  * \brief parse one track element
 393  * \param COMPLEX_INTERFACE
 394  */
 395 static bool parse_track_node COMPLEX_INTERFACE
 396 {
 397     int i_node;
 398     char *psz_name = NULL;
 399     char *psz_value = NULL;
 400     xml_elem_hnd_t *p_handler = NULL;
 401
 402     xml_elem_hnd_t track_elements[] =
 403         { {"location",     SIMPLE_CONTENT,  {NULL} },
 404           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 405           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 406           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 407           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 408           {"info",         SIMPLE_CONTENT,  {NULL} },
 409           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 410           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 411           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 412           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 413           {"link",         SIMPLE_CONTENT,  {NULL} },
 414           {"meta",         SIMPLE_CONTENT,  {NULL} },
 415           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 416           {NULL,           UNKNOWN_CONTENT, {NULL} }
 417         };
 418
 419     input_item_t *p_new_input = input_item_New( p_demux, NULL, NULL );
 420
 421     if( !p_new_input )
 422     {
 423         /* malloc has failed for input_item_New, so bailout early */
 424         return false;
 425     }
 426
 427     /* reset i_track_id */
 428     p_demux->p_sys->i_track_id = -1;
 429
 430     while( xml_ReaderRead( p_xml_reader ) == 1 )
 431     {
 432         i_node = xml_ReaderNodeType( p_xml_reader );
 433         switch( i_node )
 434         {
 435             case XML_READER_NONE:
 436                 break;
 437
 438             case XML_READER_STARTELEM:
 439                 /*  element start tag  */
 440                 psz_name = xml_ReaderName( p_xml_reader );
 441                 if( !psz_name || !*psz_name )
 442                 {
 443                     msg_Err( p_demux, "invalid xml stream" );
 444                     FREE_ATT();
 445                     return false;
 446                 }
 447                 /* choose handler */
 448                 for( p_handler = track_elements;
 449                      p_handler->name && strcmp( psz_name, p_handler->name );
 450                      p_handler++ );
 451                 if( !p_handler->name )
 452                 {
 453                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 454                     FREE_ATT();
 455                     return false;
 456                 }
 457                 FREE_NAME();
 458                 /* complex content is parsed in a separate function */
 459                 if( p_handler->type == COMPLEX_CONTENT )
 460                 {
 461                     if( !p_new_input )
 462                     {
 463                         msg_Err( p_demux,
 464                                  "at <%s> level no new item has been allocated",
 465                                  p_handler->name );
 466                         FREE_ATT();
 467                         return false;
 468                     }
 469                     if( p_handler->pf_handler.cmplx( p_demux,
 470                                                      p_new_input,
 471                                                      p_xml_reader,
 472                                                      p_handler->name ) )
 473                     {
 474                         p_handler = NULL;
 475                         FREE_ATT();
 476                     }
 477                     else
 478                     {
 479                         FREE_ATT();
 480                         return false;
 481                     }
 482                 }
 483                 break;
 484
 485             case XML_READER_TEXT:
 486                 /* simple element content */
 487                 FREE_ATT();
 488                 psz_value = xml_ReaderValue( p_xml_reader );
 489                 if( !psz_value )
 490                 {
 491                     msg_Err( p_demux, "invalid xml stream" );
 492                     FREE_ATT();
 493                     return false;
 494                 }
 495                 break;
 496
 497             case XML_READER_ENDELEM:
 498                 /* element end tag */
 499                 psz_name = xml_ReaderName( p_xml_reader );
 500                 if( !psz_name )
 501                 {
 502                     msg_Err( p_demux, "invalid xml stream" );
 503                     FREE_ATT();
 504                     return false;
 505                 }
 506                 /* leave if the current parent node <track> is terminated */
 507                 if( !strcmp( psz_name, psz_element ) )
 508                 {
 509                     FREE_ATT();
 510
 511                     if( p_demux->p_sys->i_track_id < 0 )
 512                     {
 513                         input_item_AddSubItem( p_input_item, p_new_input );
 514                         vlc_gc_decref( p_new_input );
 515                         return true;
 516                     }
 517
 518                     if( p_demux->p_sys->i_track_id >=
 519                            p_demux->p_sys->i_tracklist_entries )
 520                     {
 521                         input_item_t **pp;
 522                         pp = realloc( p_demux->p_sys->pp_tracklist,
 523                             (p_demux->p_sys->i_track_id + 1) * sizeof(*pp) );
 524                         if( !pp )
 525                             return false;
 526                         p_demux->p_sys->pp_tracklist = pp;
 527                         while( p_demux->p_sys->i_track_id >=
 528                                p_demux->p_sys->i_tracklist_entries )
 529                             pp[p_demux->p_sys->i_tracklist_entries++] = NULL;
 530                     }
 531
 532                     p_demux->p_sys->pp_tracklist[
 533                             p_demux->p_sys->i_track_id ] = p_new_input;
 534                     return true;
 535                 }
 536                 /* there MUST have been a start tag for that element name */
 537                 if( !p_handler || !p_handler->name
 538                     || strcmp( p_handler->name, psz_name ))
 539                 {
 540                     msg_Err( p_demux, "there's no open element left for <%s>",
 541                              psz_name );
 542                     FREE_ATT();
 543                     return false;
 544                 }
 545
 546                 /* special case: location */
 547                 if( !strcmp( p_handler->name, "location" ) )
 548                 {
 549                     char *psz_location = psz_value;
 550                     if( !strncmp( psz_value, "file://", 7 ) )
 551                         psz_location = decode_URI( psz_value + 7 );
 552
 553                     if( !psz_location )
 554                     {
 555                         FREE_ATT();
 556                         return false;
 557                     }
 558
 559                     if( p_demux->p_sys->psz_base && !strstr( psz_value, "://" ) )
 560                     {
 561                         char* psz_tmp;
 562                         if( asprintf( &psz_tmp, "%s%s", p_demux->p_sys->psz_base,
 563                                       psz_location ) == -1 )
 564                         {
 565                             FREE_ATT();
 566                             return NULL;
 567                         }
 568                         input_item_SetURI( p_new_input, psz_tmp );
 569                         free( psz_tmp );
 570                     }
 571                     else
 572                         input_item_SetURI( p_new_input, psz_location );
 573                     input_item_CopyOptions( p_input_item, p_new_input );
 574                     FREE_ATT();
 575                     p_handler = NULL;
 576                 }
 577                 else
 578                 {
 579                     /* there MUST be an item */
 580                     if( !p_new_input )
 581                     {
 582                         msg_Err( p_demux, "item not yet created at <%s>",
 583                                  psz_name );
 584                         FREE_ATT();
 585                         return false;
 586                     }
 587                     if( p_handler->pf_handler.smpl )
 588                     {
 589                         p_handler->pf_handler.smpl( p_new_input,
 590                                                     p_handler->name,
 591                                                     psz_value );
 592                         FREE_ATT();
 593                     }
 594                 }
 595                 FREE_ATT();
 596                 p_handler = NULL;
 597                 break;
 598
 599             default:
 600                 /* unknown/unexpected xml node */
 601                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 602                 FREE_ATT();
 603                 return false;
 604         }
 605         FREE_NAME();
 606     }
 607     msg_Err( p_demux, "unexpected end of xml data" );
 608     FREE_ATT();
 609     return false;
 610 }
 611
 612 /**
 613  * \brief handles the supported <track> sub-elements
 614  */
 615 static bool set_item_info SIMPLE_INTERFACE
 616 {
 617     /* exit if setting is impossible */
 618     if( !psz_name || !psz_value || !p_input )
 619         return false;
 620
 621
 622     /* re-convert xml special characters inside psz_value */
 623     resolve_xml_special_chars( psz_value );
 624
 625     /* handle each info element in a separate "if" clause */
 626     if( !strcmp( psz_name, "title" ) )
 627     {
 628         input_item_SetTitle( p_input, psz_value );
 629     }
 630     else if( !strcmp( psz_name, "creator" ) )
 631     {
 632         input_item_SetArtist( p_input, psz_value );
 633     }
 634     else if( !strcmp( psz_name, "album" ) )
 635     {
 636         input_item_SetAlbum( p_input, psz_value );
 637
 638     }
 639     else if( !strcmp( psz_name, "trackNum" ) )
 640     {
 641         input_item_SetTrackNum( p_input, psz_value );
 642     }
 643     else if( !strcmp( psz_name, "duration" ) )
 644     {
 645         long i_num = atol( psz_value );
 646         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 647     }
 648     else if( !strcmp( psz_name, "annotation" ) )
 649     {
 650         input_item_SetDescription( p_input, psz_value );
 651     }
 652     else if( !strcmp( psz_name, "image" ) )
 653     {
 654         input_item_SetArtURL( p_input, psz_value );
 655     }
 656     return true;
 657 }
 658
 659 /**
 660  * \brief handles the <vlc:option> elements
 661  */
 662 static bool set_option SIMPLE_INTERFACE
 663 {
 664     /* exit if setting is impossible */
 665     if( !psz_name || !psz_value || !p_input )
 666         return false;
 667
 668     /* re-convert xml special characters inside psz_value */
 669     resolve_xml_special_chars( psz_value );
 670
 671     input_item_AddOption( p_input, psz_value, 0 );
 672
 673     return true;
 674 }
 675
 676 /**
 677  * \brief parse the extension node of a XSPF playlist
 678  */
 679 static bool parse_extension_node COMPLEX_INTERFACE
 680 {
 681     char *psz_name = NULL;
 682     char *psz_value = NULL;
 683     char *psz_title = NULL;
 684     char *psz_application = NULL;
 685     int i_node;
 686     bool b_release_input_item = false;
 687     xml_elem_hnd_t *p_handler = NULL;
 688     input_item_t *p_new_input = NULL;
 689
 690     xml_elem_hnd_t pl_elements[] =
 691         { {"vlc:node",   COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 692           {"vlc:item",   COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 693           {"vlc:id",     SIMPLE_CONTENT, {NULL} },
 694           {"vlc:option", SIMPLE_CONTENT, {.smpl = set_option} },
 695           {NULL,    UNKNOWN_CONTENT, {NULL} }
 696         };
 697
 698     /* read all extension node attributes */
 699     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 700     {
 701         psz_name = xml_ReaderName( p_xml_reader );
 702         psz_value = xml_ReaderValue( p_xml_reader );
 703         if( !psz_name || !psz_value )
 704         {
 705             msg_Err( p_demux, "invalid xml stream @ <vlc:node>" );
 706             FREE_ATT();
 707             return false;
 708         }
 709         /* attribute: title */
 710         if( !strcmp( psz_name, "title" ) )
 711         {
 712             resolve_xml_special_chars( psz_value );
 713             psz_title = strdup( psz_value );
 714         }
 715         /* extension attribute: application */
 716         else if( !strcmp( psz_name, "application" ) )
 717         {
 718             psz_application = strdup( psz_value );
 719         }
 720         /* unknown attribute */
 721         else
 722             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element,
 723                       psz_name );
 724
 725         FREE_ATT();
 726     }
 727
 728     /* attribute title is mandatory except for <extension> */
 729     if( !strcmp( psz_element, "vlc:node" ) )
 730     {
 731         if( !psz_title )
 732         {
 733             msg_Warn( p_demux, "<vlc:node> requires \"title\" attribute" );
 734             return false;
 735         }
 736         p_new_input = input_item_NewWithType( VLC_OBJECT( p_demux ),
 737                           "vlc://nop", psz_title, 0, NULL, 0, -1,
 738                           ITEM_TYPE_DIRECTORY );
 739         if( p_new_input )
 740         {
 741             input_item_AddSubItem( p_input_item, p_new_input );
 742             p_input_item = p_new_input;
 743             b_release_input_item = true;
 744         }
 745         free( psz_title );
 746     }
 747     else if( !strcmp( psz_element, "extension" ) )
 748     {
 749         if( !psz_application )
 750         {
 751             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 752             return false;
 753         }
 754         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 755         {
 756             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 757             free( psz_application );
 758             return false;
 759         }
 760     }
 761     free( psz_application );
 762
 763     /* parse the child elements */
 764     while( xml_ReaderRead( p_xml_reader ) == 1 )
 765     {
 766         i_node = xml_ReaderNodeType( p_xml_reader );
 767         switch( i_node )
 768         {
 769             case XML_READER_NONE:
 770                 break;
 771             case XML_READER_STARTELEM:
 772                 /*  element start tag  */
 773                 psz_name = xml_ReaderName( p_xml_reader );
 774                 if( !psz_name || !*psz_name )
 775                 {
 776                     msg_Err( p_demux, "invalid xml stream" );
 777                     FREE_ATT();
 778                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 779                     return false;
 780                 }
 781                 /* choose handler */
 782                 for( p_handler = pl_elements;
 783                      p_handler->name && strcmp( psz_name, p_handler->name );
 784                      p_handler++ );
 785                 if( !p_handler->name )
 786                 {
 787                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 788                     FREE_ATT();
 789                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 790                     return false;
 791                 }
 792                 FREE_NAME();
 793                 /* complex content is parsed in a separate function */
 794                 if( p_handler->type == COMPLEX_CONTENT )
 795                 {
 796                     if( p_handler->pf_handler.cmplx( p_demux,
 797                                                      p_input_item,
 798                                                      p_xml_reader,
 799                                                      p_handler->name ) )
 800                     {
 801                         p_handler = NULL;
 802                         FREE_ATT();
 803                     }
 804                     else
 805                     {
 806                         FREE_ATT();
 807                         if( b_release_input_item ) vlc_gc_decref( p_new_input );
 808                         return false;
 809                     }
 810                 }
 811                 break;
 812
 813             case XML_READER_TEXT:
 814                 /* simple element content */
 815                 FREE_ATT();
 816                 psz_value = xml_ReaderValue( p_xml_reader );
 817                 if( !psz_value )
 818                 {
 819                     msg_Err( p_demux, "invalid xml stream" );
 820                     FREE_ATT();
 821                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 822                     return false;
 823                 }
 824                 break;
 825
 826             case XML_READER_ENDELEM:
 827                 /* element end tag */
 828                 psz_name = xml_ReaderName( p_xml_reader );
 829                 if( !psz_name )
 830                 {
 831                     msg_Err( p_demux, "invalid xml stream" );
 832                     FREE_ATT();
 833                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 834                     return false;
 835                 }
 836                 /* leave if the current parent node is terminated */
 837                 if( !strcmp( psz_name, psz_element ) )
 838                 {
 839                     FREE_ATT();
 840                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 841                     return true;
 842                 }
 843                 /* there MUST have been a start tag for that element name */
 844                 if( !p_handler || !p_handler->name
 845                     || strcmp( p_handler->name, psz_name ))
 846                 {
 847                     msg_Err( p_demux, "there's no open element left for <%s>",
 848                              psz_name );
 849                     FREE_ATT();
 850                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 851                     return false;
 852                 }
 853
 854                 /* special tag <vlc:id> */
 855                 if( !strcmp( p_handler->name, "vlc:id" ) )
 856                 {
 857                     p_demux->p_sys->i_track_id = atoi( psz_value );
 858                 }
 859                 else if( p_handler->pf_handler.smpl )
 860                 {
 861                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 862                                                 psz_value );
 863                 }
 864                 FREE_ATT();
 865                 p_handler = NULL;
 866                 break;
 867
 868             default:
 869                 /* unknown/unexpected xml node */
 870                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 871                 FREE_ATT();
 872                 if( b_release_input_item ) vlc_gc_decref( p_new_input );
 873                 return false;
 874         }
 875         FREE_NAME();
 876     }
 877     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 878     return false;
 879 }
 880
 881 /**
 882  * \brief parse the extension item node of a XSPF playlist
 883  */
 884 static bool parse_extitem_node COMPLEX_INTERFACE
 885 {
 886     VLC_UNUSED(psz_element);
 887     input_item_t *p_new_input = NULL;
 888     char *psz_name = NULL;
 889     char *psz_value = NULL;
 890     int i_tid = -1;
 891
 892     /* read all extension item attributes */
 893     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 894     {
 895         psz_name = xml_ReaderName( p_xml_reader );
 896         psz_value = xml_ReaderValue( p_xml_reader );
 897         if( !psz_name || !psz_value )
 898         {
 899             msg_Err( p_demux, "invalid xml stream @ <vlc:item>" );
 900             FREE_ATT();
 901             return false;
 902         }
 903         /* attribute: href */
 904         if( !strcmp( psz_name, "tid" ) )
 905         {
 906             i_tid = atoi( psz_value );
 907         }
 908         /* unknown attribute */
 909         else
 910             msg_Warn( p_demux, "invalid <vlc:item> attribute:\"%s\"", psz_name);
 911
 912         FREE_ATT();
 913     }
 914
 915     /* attribute href is mandatory */
 916     if( i_tid < 0 )
 917     {
 918         msg_Warn( p_demux, "<vlc:item> requires \"tid\" attribute" );
 919         return false;
 920     }
 921
 922     if( i_tid >= p_demux->p_sys->i_tracklist_entries )
 923     {
 924         msg_Warn( p_demux, "invalid \"tid\" attribute" );
 925         return false;
 926     }
 927
 928     p_new_input = p_demux->p_sys->pp_tracklist[ i_tid ];
 929     if( p_new_input )
 930     {
 931         input_item_AddSubItem( p_input_item, p_new_input );
 932         vlc_gc_decref( p_new_input );
 933         p_demux->p_sys->pp_tracklist[i_tid] = NULL;
 934     }
 935
 936     /* kludge for #1293 - XTAG sends ENDELEM for self closing tag */
 937     /* (libxml sends NONE) */
 938     xml_ReaderRead( p_xml_reader );
 939
 940     return true;
 941 }
 942
 943 /**
 944  * \brief skips complex element content that we can't manage
 945  */
 946 static bool skip_element COMPLEX_INTERFACE
 947 {
 948     VLC_UNUSED(p_demux); VLC_UNUSED(p_input_item);
 949     char *psz_endname;
 950
 951     while( xml_ReaderRead( p_xml_reader ) == 1 )
 952     {
 953         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 954         {
 955             psz_endname = xml_ReaderName( p_xml_reader );
 956             if( !psz_endname )
 957                 return false;
 958             if( !strcmp( psz_element, psz_endname ) )
 959             {
 960                 free( psz_endname );
 961                 return true;
 962             }
 963             else
 964                 free( psz_endname );
 965         }
 966     }
 967     return false;
 968 }