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_ATT();
 190             return false;
 191         }
 192         /* attribute: version */
 193         if( !strcmp( psz_name, "version" ) )
 194         {
 195             b_version_found = true;
 196             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 197                 msg_Warn( p_demux, "unsupported XSPF version" );
 198         }
 199         /* attribute: xmlns */
 200         else if( !strcmp( psz_name, "xmlns" ) || !strcmp( psz_name, "xmlns:vlc" ) )
 201             ;
 202         else if( !strcmp( psz_name, "xml:base" ) )
 203         {
 204             p_demux->p_sys->psz_base = strdup( psz_value );
 205         }
 206         /* unknown attribute */
 207         else
 208             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 209
 210         FREE_ATT();
 211     }
 212     /* attribute version is mandatory !!! */
 213     if( !b_version_found )
 214         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 215
 216     /* parse the child elements - we only take care of <trackList> */
 217     while( xml_ReaderRead( p_xml_reader ) == 1 )
 218     {
 219         i_node = xml_ReaderNodeType( p_xml_reader );
 220         switch( i_node )
 221         {
 222             case XML_READER_NONE:
 223                 break;
 224             case XML_READER_STARTELEM:
 225                 /*  element start tag  */
 226                 psz_name = xml_ReaderName( p_xml_reader );
 227                 if( !psz_name || !*psz_name )
 228                 {
 229                     msg_Err( p_demux, "invalid xml stream" );
 230                     FREE_ATT();
 231                     return false;
 232                 }
 233                 /* choose handler */
 234                 for( p_handler = pl_elements;
 235                      p_handler->name && strcmp( psz_name, p_handler->name );
 236                      p_handler++ );
 237                 if( !p_handler->name )
 238                 {
 239                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 240                     FREE_ATT();
 241                     return false;
 242                 }
 243                 FREE_NAME();
 244                 /* complex content is parsed in a separate function */
 245                 if( p_handler->type == COMPLEX_CONTENT )
 246                 {
 247                     if( p_handler->pf_handler.cmplx( p_demux,
 248                                                      p_input_item,
 249                                                      p_xml_reader,
 250                                                      p_handler->name ) )
 251                     {
 252                         p_handler = NULL;
 253                         FREE_ATT();
 254                     }
 255                     else
 256                     {
 257                         FREE_ATT();
 258                         return false;
 259                     }
 260                 }
 261                 break;
 262
 263             case XML_READER_TEXT:
 264                 /* simple element content */
 265                 FREE_ATT();
 266                 psz_value = xml_ReaderValue( p_xml_reader );
 267                 if( !psz_value )
 268                 {
 269                     msg_Err( p_demux, "invalid xml stream" );
 270                     FREE_ATT();
 271                     return false;
 272                 }
 273                 break;
 274
 275             case XML_READER_ENDELEM:
 276                 /* element end tag */
 277                 psz_name = xml_ReaderName( p_xml_reader );
 278                 if( !psz_name )
 279                 {
 280                     msg_Err( p_demux, "invalid xml stream" );
 281                     FREE_ATT();
 282                     return false;
 283                 }
 284                 /* leave if the current parent node <playlist> is terminated */
 285                 if( !strcmp( psz_name, psz_element ) )
 286                 {
 287                     FREE_ATT();
 288                     return true;
 289                 }
 290                 /* there MUST have been a start tag for that element name */
 291                 if( !p_handler || !p_handler->name
 292                     || strcmp( p_handler->name, psz_name ))
 293                 {
 294                     msg_Err( p_demux, "there's no open element left for <%s>",
 295                              psz_name );
 296                     FREE_ATT();
 297                     return false;
 298                 }
 299
 300                 if( p_handler->pf_handler.smpl )
 301                 {
 302                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 303                                                 psz_value );
 304                 }
 305                 FREE_ATT();
 306                 p_handler = NULL;
 307                 break;
 308
 309             default:
 310                 /* unknown/unexpected xml node */
 311                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 312                 FREE_ATT();
 313                 return false;
 314         }
 315         FREE_NAME();
 316     }
 317     return false;
 318 }
 319
 320 /**
 321  * \brief parses the tracklist node which only may contain <track>s
 322  */
 323 static bool parse_tracklist_node COMPLEX_INTERFACE
 324 {
 325     VLC_UNUSED(psz_element);
 326     char *psz_name;
 327     int i_ntracks = 0;
 328
 329     /* now parse the <track>s */
 330     while( xml_ReaderRead( p_xml_reader ) == 1 )
 331     {
 332         int i_node = xml_ReaderNodeType( p_xml_reader );
 333         if( i_node == XML_READER_STARTELEM )
 334         {
 335             char *psz_eltname = xml_ReaderName( p_xml_reader );
 336             if( !psz_eltname )
 337             {
 338                 msg_Err( p_demux, "unexpected end of xml data" );
 339                 free( psz_eltname );
 340                 return false;
 341             }
 342             if( strcmp( psz_eltname, "track") )
 343             {
 344                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 345                          psz_eltname );
 346                 free( psz_eltname );
 347                 return false;
 348             }
 349             free( psz_eltname );
 350
 351             /* parse the track data in a separate function */
 352             if( parse_track_node( p_demux, p_input_item, p_xml_reader,
 353                                   "track" ) )
 354                 i_ntracks++;
 355         }
 356         else if( i_node == XML_READER_ENDELEM )
 357             break;
 358     }
 359
 360     /* the <trackList> has to be terminated */
 361     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 362     {
 363         msg_Err( p_demux, "there's a missing </trackList>" );
 364         return false;
 365     }
 366     psz_name = xml_ReaderName( p_xml_reader );
 367     if( !psz_name || strcmp( psz_name, "trackList" ) )
 368     {
 369         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 370         free( psz_name );
 371         return false;
 372     }
 373     free( psz_name );
 374
 375     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 376     return true;
 377 }
 378
 379 /**
 380  * \brief parse one track element
 381  * \param COMPLEX_INTERFACE
 382  */
 383 static bool parse_track_node COMPLEX_INTERFACE
 384 {
 385     int i_node;
 386     char *psz_name = NULL;
 387     char *psz_value = NULL;
 388     xml_elem_hnd_t *p_handler = NULL;
 389
 390     xml_elem_hnd_t track_elements[] =
 391         { {"location",     SIMPLE_CONTENT,  {NULL} },
 392           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 393           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 394           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 395           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 396           {"info",         SIMPLE_CONTENT,  {NULL} },
 397           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 398           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 399           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 400           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 401           {"link",         SIMPLE_CONTENT,  {NULL} },
 402           {"meta",         SIMPLE_CONTENT,  {NULL} },
 403           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 404           {NULL,           UNKNOWN_CONTENT, {NULL} }
 405         };
 406
 407     input_item_t *p_new_input = input_item_New( p_demux, NULL, NULL );
 408
 409     if( !p_new_input )
 410     {
 411         /* malloc has failed for input_item_New, so bailout early */
 412         return false;
 413     }
 414
 415     /* reset i_track_id */
 416     p_demux->p_sys->i_track_id = -1;
 417
 418     while( xml_ReaderRead( p_xml_reader ) == 1 )
 419     {
 420         i_node = xml_ReaderNodeType( p_xml_reader );
 421         switch( i_node )
 422         {
 423             case XML_READER_NONE:
 424                 break;
 425
 426             case XML_READER_STARTELEM:
 427                 /*  element start tag  */
 428                 psz_name = xml_ReaderName( p_xml_reader );
 429                 if( !psz_name || !*psz_name )
 430                 {
 431                     msg_Err( p_demux, "invalid xml stream" );
 432                     FREE_ATT();
 433                     return false;
 434                 }
 435                 /* choose handler */
 436                 for( p_handler = track_elements;
 437                      p_handler->name && strcmp( psz_name, p_handler->name );
 438                      p_handler++ );
 439                 if( !p_handler->name )
 440                 {
 441                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 442                     FREE_ATT();
 443                     return false;
 444                 }
 445                 FREE_NAME();
 446                 /* complex content is parsed in a separate function */
 447                 if( p_handler->type == COMPLEX_CONTENT )
 448                 {
 449                     if( !p_new_input )
 450                     {
 451                         msg_Err( p_demux,
 452                                  "at <%s> level no new item has been allocated",
 453                                  p_handler->name );
 454                         FREE_ATT();
 455                         return false;
 456                     }
 457                     if( p_handler->pf_handler.cmplx( p_demux,
 458                                                      p_new_input,
 459                                                      p_xml_reader,
 460                                                      p_handler->name ) )
 461                     {
 462                         p_handler = NULL;
 463                         FREE_ATT();
 464                     }
 465                     else
 466                     {
 467                         FREE_ATT();
 468                         return false;
 469                     }
 470                 }
 471                 break;
 472
 473             case XML_READER_TEXT:
 474                 /* simple element content */
 475                 FREE_ATT();
 476                 psz_value = xml_ReaderValue( p_xml_reader );
 477                 if( !psz_value )
 478                 {
 479                     msg_Err( p_demux, "invalid xml stream" );
 480                     FREE_ATT();
 481                     return false;
 482                 }
 483                 break;
 484
 485             case XML_READER_ENDELEM:
 486                 /* element end tag */
 487                 psz_name = xml_ReaderName( p_xml_reader );
 488                 if( !psz_name )
 489                 {
 490                     msg_Err( p_demux, "invalid xml stream" );
 491                     FREE_ATT();
 492                     return false;
 493                 }
 494
 495                 /* leave if the current parent node <track> is terminated */
 496                 if( !strcmp( psz_name, psz_element ) )
 497                 {
 498                     FREE_ATT();
 499
 500                     /* Make sure we have a URI */
 501                     char *psz_uri = input_item_GetURI( p_new_input );
 502                     if( !psz_uri )
 503                     {
 504                         input_item_SetURI( p_new_input, "vlc://nop" );
 505                     }
 506                     free( psz_uri );
 507
 508                     if( p_demux->p_sys->i_track_id < 0 )
 509                     {
 510                         input_item_AddSubItem( p_input_item, p_new_input );
 511                         vlc_gc_decref( p_new_input );
 512                         return true;
 513                     }
 514
 515                     if( p_demux->p_sys->i_track_id >=
 516                            p_demux->p_sys->i_tracklist_entries )
 517                     {
 518                         input_item_t **pp;
 519                         pp = realloc( p_demux->p_sys->pp_tracklist,
 520                             (p_demux->p_sys->i_track_id + 1) * sizeof(*pp) );
 521                         if( !pp )
 522                             return false;
 523                         p_demux->p_sys->pp_tracklist = pp;
 524                         while( p_demux->p_sys->i_track_id >=
 525                                p_demux->p_sys->i_tracklist_entries )
 526                             pp[p_demux->p_sys->i_tracklist_entries++] = NULL;
 527                     }
 528
 529                     p_demux->p_sys->pp_tracklist[
 530                             p_demux->p_sys->i_track_id ] = p_new_input;
 531                     return true;
 532                 }
 533                 /* there MUST have been a start tag for that element name */
 534                 if( !p_handler || !p_handler->name
 535                     || strcmp( p_handler->name, psz_name ))
 536                 {
 537                     msg_Err( p_demux, "there's no open element left for <%s>",
 538                              psz_name );
 539                     FREE_ATT();
 540                     return false;
 541                 }
 542
 543                 /* special case: location */
 544                 if( !strcmp( p_handler->name, "location" ) )
 545                 {
 546                     /* FIXME: This is broken. Scheme-relative (//...) locations
 547                      * and anchors (#...) are not resolved correctly. Also,
 548                      * host-relative (/...) and directory-relative locations
 549                      * ("relative path" in vernacular) should be resolved.
 550                      * Last, psz_base should default to the XSPF resource
 551                      * location if missing (not the current working directory).
 552                      * -- Courmisch */
 553                     if( p_demux->p_sys->psz_base && !strstr( psz_value, "://" ) )
 554                     {
 555                         char* psz_tmp;
 556                         if( asprintf( &psz_tmp, "%s%s",
 557                                 p_demux->p_sys->psz_base, psz_value ) == -1 )
 558                         {
 559                             FREE_ATT();
 560                             return NULL;
 561                         }
 562                         input_item_SetURI( p_new_input, psz_tmp );
 563                         free( psz_tmp );
 564                     }
 565                     else
 566                         input_item_SetURI( p_new_input, psz_value );
 567                     input_item_CopyOptions( p_input_item, p_new_input );
 568                     FREE_ATT();
 569                     p_handler = NULL;
 570                 }
 571                 else
 572                 {
 573                     /* there MUST be an item */
 574                     if( !p_new_input )
 575                     {
 576                         msg_Err( p_demux, "item not yet created at <%s>",
 577                                  psz_name );
 578                         FREE_ATT();
 579                         return false;
 580                     }
 581                     if( p_handler->pf_handler.smpl )
 582                     {
 583                         p_handler->pf_handler.smpl( p_new_input,
 584                                                     p_handler->name,
 585                                                     psz_value );
 586                         FREE_ATT();
 587                     }
 588                 }
 589                 FREE_ATT();
 590                 p_handler = NULL;
 591                 break;
 592
 593             default:
 594                 /* unknown/unexpected xml node */
 595                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 596                 FREE_ATT();
 597                 return false;
 598         }
 599         FREE_NAME();
 600     }
 601     msg_Err( p_demux, "unexpected end of xml data" );
 602     FREE_ATT();
 603     return false;
 604 }
 605
 606 /**
 607  * \brief handles the supported <track> sub-elements
 608  */
 609 static bool set_item_info SIMPLE_INTERFACE
 610 {
 611     /* exit if setting is impossible */
 612     if( !psz_name || !psz_value || !p_input )
 613         return false;
 614
 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     char *psz_name = NULL;
 886     char *psz_value = NULL;
 887     int i_tid = -1;
 888
 889     /* read all extension item attributes */
 890     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 891     {
 892         psz_name = xml_ReaderName( p_xml_reader );
 893         psz_value = xml_ReaderValue( p_xml_reader );
 894         if( !psz_name || !psz_value )
 895         {
 896             msg_Err( p_demux, "invalid xml stream @ <vlc:item>" );
 897             FREE_ATT();
 898             return false;
 899         }
 900         /* attribute: href */
 901         if( !strcmp( psz_name, "tid" ) )
 902         {
 903             i_tid = atoi( psz_value );
 904         }
 905         /* unknown attribute */
 906         else
 907             msg_Warn( p_demux, "invalid <vlc:item> attribute:\"%s\"", psz_name);
 908
 909         FREE_ATT();
 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     char *psz_endname;
 947
 948     while( xml_ReaderRead( p_xml_reader ) == 1 )
 949     {
 950         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 951         {
 952             psz_endname = xml_ReaderName( p_xml_reader );
 953             if( !psz_endname )
 954                 return false;
 955             if( !strcmp( psz_element, psz_endname ) )
 956             {
 957                 free( psz_endname );
 958                 return true;
 959             }
 960             else
 961                 free( psz_endname );
 962         }
 963     }
 964     return false;
 965 }