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     demux_sys_t *p_sys = p_demux->p_sys;
  67     for( int i = 0; i < p_sys->i_tracklist_entries; i++ )
  68     {
  69         if( p_sys->pp_tracklist[i] )
  70             vlc_gc_decref( p_sys->pp_tracklist[i] );
  71     }
  72     free( p_sys->pp_tracklist );
  73     free( p_sys->psz_base );
  74     free( 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     input_item_t *p_current_input = GetCurrentItem(p_demux);
  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         free( psz_name );
 117         goto end;
 118     }
 119     free( psz_name );
 120
 121     input_item_node_t *p_subitems =
 122         input_item_node_Create( p_current_input );
 123
 124     i_ret = parse_playlist_node( p_demux, p_subitems,
 125                                  p_xml_reader, "playlist" ) ? 0 : -1;
 126
 127     for( int i = 0 ; i < p_demux->p_sys->i_tracklist_entries ; i++ )
 128     {
 129         input_item_t *p_new_input = p_demux->p_sys->pp_tracklist[i];
 130         if( p_new_input )
 131         {
 132             input_item_node_AppendItem( p_subitems, p_new_input );
 133         }
 134     }
 135
 136     input_item_node_PostAndDelete( p_subitems );
 137
 138 end:
 139     vlc_gc_decref(p_current_input);
 140     if( p_xml_reader )
 141         xml_ReaderDelete( p_xml, p_xml_reader );
 142     if( p_xml )
 143         xml_Delete( p_xml );
 144     return i_ret; /* Needed for correct operation of go back */
 145 }
 146
 147 /** \brief dummy function for demux callback interface */
 148 static int Control( demux_t *p_demux, int i_query, va_list args )
 149 {
 150     VLC_UNUSED(p_demux); VLC_UNUSED(i_query); VLC_UNUSED(args);
 151     return VLC_EGENERIC;
 152 }
 153
 154 /**
 155  * \brief parse the root node of a XSPF playlist
 156  * \param p_demux demuxer instance
 157  * \param p_input_item current input item
 158  * \param p_xml_reader xml reader instance
 159  * \param psz_element name of element to parse
 160  */
 161 static bool parse_playlist_node COMPLEX_INTERFACE
 162 {
 163     input_item_t *p_input_item = p_input_node->p_item;
 164     char *psz_name = NULL;
 165     char *psz_value = NULL;
 166     bool b_version_found = false;
 167     int i_node;
 168     bool b_ret = false;
 169     xml_elem_hnd_t *p_handler = NULL;
 170
 171     xml_elem_hnd_t pl_elements[] =
 172         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 173           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 174           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 175           {"info",         SIMPLE_CONTENT,  {NULL} },
 176           {"location",     SIMPLE_CONTENT,  {NULL} },
 177           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 178           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 179           {"date",         SIMPLE_CONTENT,  {NULL} },
 180           {"license",      SIMPLE_CONTENT,  {NULL} },
 181           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 182           {"link",         SIMPLE_CONTENT,  {NULL} },
 183           {"meta",         SIMPLE_CONTENT,  {NULL} },
 184           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 185           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 186           {NULL,           UNKNOWN_CONTENT, {NULL} }
 187         };
 188
 189     /* read all playlist attributes */
 190     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 191     {
 192         psz_name = xml_ReaderName( p_xml_reader );
 193         psz_value = xml_ReaderValue( p_xml_reader );
 194         if( !psz_name || !psz_value )
 195         {
 196             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 197             goto end;
 198         }
 199         /* attribute: version */
 200         if( !strcmp( psz_name, "version" ) )
 201         {
 202             b_version_found = true;
 203             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 204                 msg_Warn( p_demux, "unsupported XSPF version" );
 205         }
 206         /* attribute: xmlns */
 207         else if( !strcmp( psz_name, "xmlns" ) || !strcmp( psz_name, "xmlns:vlc" ) )
 208             ;
 209         else if( !strcmp( psz_name, "xml:base" ) )
 210         {
 211             p_demux->p_sys->psz_base = strdup( psz_value );
 212         }
 213         /* unknown attribute */
 214         else
 215             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 216
 217         free( psz_name );
 218         free( psz_value );
 219     }
 220     /* attribute version is mandatory !!! */
 221     if( !b_version_found )
 222         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 223
 224     /* parse the child elements - we only take care of <trackList> */
 225     psz_name = NULL;
 226     psz_value = NULL;
 227     while( xml_ReaderRead( p_xml_reader ) == 1 )
 228     {
 229         i_node = xml_ReaderNodeType( p_xml_reader );
 230         switch( i_node )
 231         {
 232             case XML_READER_NONE:
 233                 break;
 234             case XML_READER_STARTELEM:
 235                 /*  element start tag  */
 236                 psz_name = xml_ReaderName( p_xml_reader );
 237                 if( !psz_name || !*psz_name )
 238                 {
 239                     msg_Err( p_demux, "invalid xml stream" );
 240                     goto end;
 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                     goto end;
 250                 }
 251                 FREE_NAME();
 252                 /* complex content is parsed in a separate function */
 253                 if( p_handler->type == COMPLEX_CONTENT )
 254                 {
 255                     FREE_VALUE();
 256                     if( p_handler->pf_handler.cmplx( p_demux,
 257                                                      p_input_node,
 258                                                      p_xml_reader,
 259                                                      p_handler->name ) )
 260                     {
 261                         p_handler = NULL;
 262                     }
 263                     else
 264                     {
 265                         return false;
 266                     }
 267                 }
 268                 break;
 269
 270             case XML_READER_TEXT:
 271                 /* simple element content */
 272                 free( psz_value );
 273                 psz_value = xml_ReaderValue( p_xml_reader );
 274                 if( !psz_value )
 275                 {
 276                     msg_Err( p_demux, "invalid xml stream" );
 277                     goto end;
 278                 }
 279                 break;
 280
 281             case XML_READER_ENDELEM:
 282                 /* element end tag */
 283                 psz_name = xml_ReaderName( p_xml_reader );
 284                 if( !psz_name )
 285                 {
 286                     msg_Err( p_demux, "invalid xml stream" );
 287                     goto end;
 288                 }
 289                 /* leave if the current parent node <playlist> is terminated */
 290                 if( !strcmp( psz_name, psz_element ) )
 291                 {
 292                     b_ret = true;
 293                     goto end;
 294                 }
 295                 /* there MUST have been a start tag for that element name */
 296                 if( !p_handler || !p_handler->name
 297                     || strcmp( p_handler->name, psz_name ))
 298                 {
 299                     msg_Err( p_demux, "there's no open element left for <%s>",
 300                              psz_name );
 301                     goto end;
 302                 }
 303
 304                 if( p_handler->pf_handler.smpl )
 305                 {
 306                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 307                                                 psz_value );
 308                 }
 309                 FREE_ATT();
 310                 p_handler = NULL;
 311                 break;
 312
 313             default:
 314                 /* unknown/unexpected xml node */
 315                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 316                 goto end;
 317         }
 318     }
 319
 320 end:
 321     free( psz_name );
 322     free( psz_value );
 323     return b_ret;
 324 }
 325
 326 /**
 327  * \brief parses the tracklist node which only may contain <track>s
 328  */
 329 static bool parse_tracklist_node COMPLEX_INTERFACE
 330 {
 331     VLC_UNUSED(psz_element);
 332     char *psz_name;
 333     int i_ntracks = 0;
 334
 335     /* now parse the <track>s */
 336     while( xml_ReaderRead( p_xml_reader ) == 1 )
 337     {
 338         int i_node = xml_ReaderNodeType( p_xml_reader );
 339         if( i_node == XML_READER_STARTELEM )
 340         {
 341             char *psz_eltname = xml_ReaderName( p_xml_reader );
 342             if( !psz_eltname )
 343             {
 344                 msg_Err( p_demux, "unexpected end of xml data" );
 345                 free( psz_eltname );
 346                 return false;
 347             }
 348             if( strcmp( psz_eltname, "track") )
 349             {
 350                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 351                          psz_eltname );
 352                 free( psz_eltname );
 353                 return false;
 354             }
 355             free( psz_eltname );
 356
 357             /* parse the track data in a separate function */
 358             if( parse_track_node( p_demux, p_input_node,
 359                                   p_xml_reader, "track" ) )
 360                 i_ntracks++;
 361         }
 362         else if( i_node == XML_READER_ENDELEM )
 363             break;
 364     }
 365
 366     /* the <trackList> has to be terminated */
 367     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 368     {
 369         msg_Err( p_demux, "there's a missing </trackList>" );
 370         return false;
 371     }
 372     psz_name = xml_ReaderName( p_xml_reader );
 373     if( !psz_name || strcmp( psz_name, "trackList" ) )
 374     {
 375         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 376         free( psz_name );
 377         return false;
 378     }
 379     free( psz_name );
 380
 381     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 382     return true;
 383 }
 384
 385 /**
 386  * \brief parse one track element
 387  * \param COMPLEX_INTERFACE
 388  */
 389 static bool parse_track_node COMPLEX_INTERFACE
 390 {
 391     input_item_t *p_input_item = p_input_node->p_item;
 392     char *psz_name = NULL;
 393     char *psz_value = NULL;
 394     xml_elem_hnd_t *p_handler = NULL;
 395     demux_sys_t *p_sys = p_demux->p_sys;
 396     bool b_ret = false;
 397
 398     xml_elem_hnd_t track_elements[] =
 399         { {"location",     SIMPLE_CONTENT,  {NULL} },
 400           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 401           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 402           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 403           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 404           {"info",         SIMPLE_CONTENT,  {NULL} },
 405           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 406           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 407           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 408           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 409           {"link",         SIMPLE_CONTENT,  {NULL} },
 410           {"meta",         SIMPLE_CONTENT,  {NULL} },
 411           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 412           {NULL,           UNKNOWN_CONTENT, {NULL} }
 413         };
 414
 415     input_item_t *p_new_input = input_item_New( p_demux, NULL, NULL );
 416     input_item_node_t *p_new_node = input_item_node_Create( p_new_input );
 417
 418     if( !p_new_input )
 419     {
 420         /* malloc has failed for input_item_New, so bailout early */
 421         return false;
 422     }
 423
 424     /* reset i_track_id */
 425     p_sys->i_track_id = -1;
 426
 427     while( xml_ReaderRead( p_xml_reader ) == 1 )
 428     {
 429         int i_node = xml_ReaderNodeType( p_xml_reader );
 430         switch( i_node )
 431         {
 432             case XML_READER_NONE:
 433                 break;
 434
 435             case XML_READER_STARTELEM:
 436                 /*  element start tag  */
 437                 psz_name = xml_ReaderName( p_xml_reader );
 438                 if( !psz_name || !*psz_name )
 439                 {
 440                     msg_Err( p_demux, "invalid xml stream" );
 441                     goto end;
 442                 }
 443                 /* choose handler */
 444                 for( p_handler = track_elements;
 445                      p_handler->name && strcmp( psz_name, p_handler->name );
 446                      p_handler++ );
 447                 if( !p_handler->name )
 448                 {
 449                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 450                     goto end;
 451                 }
 452                 FREE_NAME();
 453                 /* complex content is parsed in a separate function */
 454                 if( p_handler->type == COMPLEX_CONTENT )
 455                 {
 456                     FREE_VALUE();
 457
 458                     bool b_res = p_handler->pf_handler.cmplx( p_demux,
 459                                                         p_new_node,
 460                                                         p_xml_reader,
 461                                                         p_handler->name );
 462                     if( b_res )
 463                     {
 464                         p_handler = NULL;
 465                     }
 466                     else
 467                     {
 468                         return false;
 469                     }
 470                 }
 471                 break;
 472
 473             case XML_READER_TEXT:
 474                 /* simple element content */
 475                 free( psz_value );
 476                 psz_value = xml_ReaderValue( p_xml_reader );
 477                 if( !psz_value )
 478                 {
 479                     msg_Err( p_demux, "invalid xml stream" );
 480                     goto end;
 481                 }
 482                 break;
 483
 484             case XML_READER_ENDELEM:
 485                 /* element end tag */
 486                 psz_name = xml_ReaderName( p_xml_reader );
 487                 if( !psz_name )
 488                 {
 489                     msg_Err( p_demux, "invalid xml stream" );
 490                     goto end;
 491                 }
 492
 493                 /* leave if the current parent node <track> is terminated */
 494                 if( !strcmp( psz_name, psz_element ) )
 495                 {
 496                     free( psz_name );
 497                     free( psz_value );
 498
 499                     /* Make sure we have a URI */
 500                     char *psz_uri = input_item_GetURI( p_new_input );
 501                     if( !psz_uri )
 502                     {
 503                         input_item_SetURI( p_new_input, "vlc://nop" );
 504                     }
 505                     free( psz_uri );
 506
 507                     if( p_sys->i_track_id < 0 )
 508                     {
 509                         input_item_node_AppendNode( p_input_node, p_new_node );
 510                         vlc_gc_decref( p_new_input );
 511                         return true;
 512                     }
 513
 514                     if( p_sys->i_track_id >= p_sys->i_tracklist_entries )
 515                     {
 516                         input_item_t **pp;
 517                         pp = realloc( p_sys->pp_tracklist,
 518                             (p_sys->i_track_id + 1) * sizeof(*pp) );
 519                         if( !pp )
 520                             return false;
 521                         p_sys->pp_tracklist = pp;
 522                         while( p_sys->i_track_id >= p_sys->i_tracklist_entries )
 523                             pp[p_sys->i_tracklist_entries++] = NULL;
 524                     }
 525
 526                     p_sys->pp_tracklist[ p_sys->i_track_id ] = p_new_input;
 527                     return true;
 528                 }
 529                 /* there MUST have been a start tag for that element name */
 530                 if( !p_handler || !p_handler->name
 531                     || strcmp( p_handler->name, psz_name ))
 532                 {
 533                     msg_Err( p_demux, "there's no open element left for <%s>",
 534                              psz_name );
 535                     goto end;
 536                 }
 537
 538                 /* special case: location */
 539                 if( !strcmp( p_handler->name, "location" ) )
 540                 {
 541                     if( psz_value == NULL )
 542                         input_item_SetURI( p_new_input, "vlc://nop" );
 543                     else
 544                     /* FIXME: This is broken. Scheme-relative (//...) locations
 545                      * and anchors (#...) are not resolved correctly. Also,
 546                      * host-relative (/...) and directory-relative locations
 547                      * ("relative path" in vernacular) should be resolved.
 548                      * Last, psz_base should default to the XSPF resource
 549                      * location if missing (not the current working directory).
 550                      * -- Courmisch */
 551                     if( p_sys->psz_base && !strstr( psz_value, "://" ) )
 552                     {
 553                         char* psz_tmp;
 554                         if( asprintf( &psz_tmp, "%s%s", p_sys->psz_base,
 555                                       psz_value ) == -1 )
 556                         {
 557                             goto end;
 558                         }
 559                         input_item_SetURI( p_new_input, psz_tmp );
 560                         free( psz_tmp );
 561                     }
 562                     else
 563                         input_item_SetURI( p_new_input, psz_value );
 564                     input_item_CopyOptions( p_input_item, p_new_input );
 565                 }
 566                 else
 567                 {
 568                     /* there MUST be an item */
 569                     if( p_handler->pf_handler.smpl )
 570                     {
 571                         p_handler->pf_handler.smpl( p_new_input,
 572                                                     p_handler->name,
 573                                                     psz_value );
 574                         FREE_ATT();
 575                     }
 576                 }
 577                 FREE_ATT();
 578                 p_handler = NULL;
 579                 break;
 580
 581             default:
 582                 /* unknown/unexpected xml node */
 583                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 584                 goto end;
 585         }
 586     }
 587     msg_Err( p_demux, "unexpected end of xml data" );
 588
 589 end:
 590     free( psz_name );
 591     free( psz_value );
 592     return b_ret;
 593 }
 594
 595 /**
 596  * \brief handles the supported <track> sub-elements
 597  */
 598 static bool set_item_info SIMPLE_INTERFACE
 599 {
 600     /* exit if setting is impossible */
 601     if( !psz_name || !psz_value || !p_input )
 602         return false;
 603
 604     /* re-convert xml special characters inside psz_value */
 605     resolve_xml_special_chars( psz_value );
 606
 607     /* handle each info element in a separate "if" clause */
 608     if( !strcmp( psz_name, "title" ) )
 609     {
 610         input_item_SetTitle( p_input, psz_value );
 611     }
 612     else if( !strcmp( psz_name, "creator" ) )
 613     {
 614         input_item_SetArtist( p_input, psz_value );
 615     }
 616     else if( !strcmp( psz_name, "album" ) )
 617     {
 618         input_item_SetAlbum( p_input, psz_value );
 619
 620     }
 621     else if( !strcmp( psz_name, "trackNum" ) )
 622     {
 623         input_item_SetTrackNum( p_input, psz_value );
 624     }
 625     else if( !strcmp( psz_name, "duration" ) )
 626     {
 627         long i_num = atol( psz_value );
 628         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 629     }
 630     else if( !strcmp( psz_name, "annotation" ) )
 631     {
 632         input_item_SetDescription( p_input, psz_value );
 633     }
 634     else if( !strcmp( psz_name, "image" ) )
 635     {
 636         input_item_SetArtURL( p_input, psz_value );
 637     }
 638     return true;
 639 }
 640
 641 /**
 642  * \brief handles the <vlc:option> elements
 643  */
 644 static bool set_option SIMPLE_INTERFACE
 645 {
 646     /* exit if setting is impossible */
 647     if( !psz_name || !psz_value || !p_input )
 648         return false;
 649
 650     /* re-convert xml special characters inside psz_value */
 651     resolve_xml_special_chars( psz_value );
 652
 653     input_item_AddOption( p_input, psz_value, 0 );
 654
 655     return true;
 656 }
 657
 658 /**
 659  * \brief parse the extension node of a XSPF playlist
 660  */
 661 static bool parse_extension_node COMPLEX_INTERFACE
 662 {
 663     input_item_t *p_input_item = p_input_node->p_item;
 664     char *psz_name = NULL;
 665     char *psz_value = NULL;
 666     char *psz_title = NULL;
 667     char *psz_application = NULL;
 668     int i_node;
 669     bool b_release_input_item = false;
 670     xml_elem_hnd_t *p_handler = NULL;
 671     input_item_t *p_new_input = NULL;
 672
 673     xml_elem_hnd_t pl_elements[] =
 674         { {"vlc:node",   COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 675           {"vlc:item",   COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 676           {"vlc:id",     SIMPLE_CONTENT, {NULL} },
 677           {"vlc:option", SIMPLE_CONTENT, {.smpl = set_option} },
 678           {NULL,    UNKNOWN_CONTENT, {NULL} }
 679         };
 680
 681     /* read all extension node attributes */
 682     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 683     {
 684         psz_name = xml_ReaderName( p_xml_reader );
 685         psz_value = xml_ReaderValue( p_xml_reader );
 686         if( !psz_name || !psz_value )
 687         {
 688             msg_Err( p_demux, "invalid xml stream @ <vlc:node>" );
 689             FREE_ATT();
 690             return false;
 691         }
 692         /* attribute: title */
 693         if( !strcmp( psz_name, "title" ) )
 694         {
 695             resolve_xml_special_chars( psz_value );
 696             psz_title = psz_value;
 697         }
 698         /* extension attribute: application */
 699         else if( !strcmp( psz_name, "application" ) )
 700         {
 701             psz_application = psz_value;
 702         }
 703         /* unknown attribute */
 704         else
 705         {
 706             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element,
 707                       psz_name );
 708             FREE_VALUE();
 709         }
 710         FREE_NAME();
 711         psz_value = NULL;
 712     }
 713
 714     /* attribute title is mandatory except for <extension> */
 715     if( !strcmp( psz_element, "vlc:node" ) )
 716     {
 717         if( !psz_title )
 718         {
 719             msg_Warn( p_demux, "<vlc:node> requires \"title\" attribute" );
 720             return false;
 721         }
 722         p_new_input = input_item_NewWithType( VLC_OBJECT( p_demux ),
 723                           "vlc://nop", psz_title, 0, NULL, 0, -1,
 724                           ITEM_TYPE_DIRECTORY );
 725         if( p_new_input )
 726         {
 727             p_input_node =
 728                 input_item_node_AppendItem( p_input_node, p_new_input );
 729             p_input_item = p_new_input;
 730             b_release_input_item = true;
 731         }
 732         free( psz_title );
 733     }
 734     else if( !strcmp( psz_element, "extension" ) )
 735     {
 736         if( !psz_application )
 737         {
 738             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 739             return false;
 740         }
 741         /* Skip the extension if the application is not vlc
 742            This will skip all children of the current node */
 743         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 744         {
 745             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 746             free( psz_application );
 747             /* Skip all children */
 748             while( xml_ReaderRead( p_xml_reader ) == 1 )
 749             {
 750                 if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 751                 {
 752                     char *psz_name = xml_ReaderName( p_xml_reader );
 753                     if( !strcmp( psz_name, "extension" ) )
 754                     {
 755                         free( psz_name );
 756                         break;
 757                     }
 758                     msg_Dbg( p_demux, "\tskipping \"%s\" extension child", psz_name );
 759                     free( psz_name );
 760                 }
 761             }
 762             return true;
 763         }
 764     }
 765     free( psz_application );
 766
 767
 768     /* parse the child elements */
 769     while( xml_ReaderRead( p_xml_reader ) == 1 )
 770     {
 771         i_node = xml_ReaderNodeType( p_xml_reader );
 772         switch( i_node )
 773         {
 774             case XML_READER_NONE:
 775                 break;
 776             case XML_READER_STARTELEM:
 777                 /*  element start tag  */
 778                 psz_name = xml_ReaderName( p_xml_reader );
 779                 if( !psz_name || !*psz_name )
 780                 {
 781                     msg_Err( p_demux, "invalid xml stream" );
 782                     FREE_ATT();
 783                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 784                     return false;
 785                 }
 786                 /* choose handler */
 787                 for( p_handler = pl_elements;
 788                      p_handler->name && strcmp( psz_name, p_handler->name );
 789                      p_handler++ );
 790                 if( !p_handler->name )
 791                 {
 792                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 793                     FREE_ATT();
 794                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 795                     return false;
 796                 }
 797                 FREE_NAME();
 798                 /* complex content is parsed in a separate function */
 799                 if( p_handler->type == COMPLEX_CONTENT )
 800                 {
 801                     if( p_handler->pf_handler.cmplx( p_demux,
 802                                                      p_input_node,
 803                                                      p_xml_reader,
 804                                                      p_handler->name ) )
 805                     {
 806                         p_handler = NULL;
 807                         FREE_ATT();
 808                     }
 809                     else
 810                     {
 811                         FREE_ATT();
 812                         if( b_release_input_item ) vlc_gc_decref( p_new_input );
 813                         return false;
 814                     }
 815                 }
 816                 break;
 817
 818             case XML_READER_TEXT:
 819                 /* simple element content */
 820                 FREE_ATT();
 821                 psz_value = xml_ReaderValue( p_xml_reader );
 822                 if( !psz_value )
 823                 {
 824                     msg_Err( p_demux, "invalid xml stream" );
 825                     FREE_ATT();
 826                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 827                     return false;
 828                 }
 829                 break;
 830
 831             case XML_READER_ENDELEM:
 832                 /* element end tag */
 833                 psz_name = xml_ReaderName( p_xml_reader );
 834                 if( !psz_name )
 835                 {
 836                     msg_Err( p_demux, "invalid xml stream" );
 837                     FREE_ATT();
 838                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 839                     return false;
 840                 }
 841                 /* leave if the current parent node is terminated */
 842                 if( !strcmp( psz_name, psz_element ) )
 843                 {
 844                     FREE_ATT();
 845                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 846                     return true;
 847                 }
 848                 /* there MUST have been a start tag for that element name */
 849                 if( !p_handler || !p_handler->name
 850                     || strcmp( p_handler->name, psz_name ))
 851                 {
 852                     msg_Err( p_demux, "there's no open element left for <%s>",
 853                              psz_name );
 854                     FREE_ATT();
 855                     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 856                     return false;
 857                 }
 858
 859                 /* special tag <vlc:id> */
 860                 if( !strcmp( p_handler->name, "vlc:id" ) )
 861                 {
 862                     p_demux->p_sys->i_track_id = atoi( psz_value );
 863                 }
 864                 else if( p_handler->pf_handler.smpl )
 865                 {
 866                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 867                                                 psz_value );
 868                 }
 869                 FREE_ATT();
 870                 p_handler = NULL;
 871                 break;
 872
 873             default:
 874                 /* unknown/unexpected xml node */
 875                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 876                 FREE_ATT();
 877                 if( b_release_input_item ) vlc_gc_decref( p_new_input );
 878                 return false;
 879         }
 880         FREE_NAME();
 881     }
 882     if( b_release_input_item ) vlc_gc_decref( p_new_input );
 883     return false;
 884 }
 885
 886 /**
 887  * \brief parse the extension item node of a XSPF playlist
 888  */
 889 static bool parse_extitem_node COMPLEX_INTERFACE
 890 {
 891     VLC_UNUSED(psz_element);
 892     input_item_t *p_new_input = NULL;
 893     int i_tid = -1;
 894
 895     /* read all extension item attributes */
 896     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 897     {
 898         char *psz_name = xml_ReaderName( p_xml_reader );
 899         char *psz_value = xml_ReaderValue( p_xml_reader );
 900         if( !psz_name || !psz_value )
 901         {
 902             msg_Err( p_demux, "invalid xml stream @ <vlc:item>" );
 903             free( psz_name );
 904             free( psz_value );
 905             return false;
 906         }
 907         /* attribute: href */
 908         if( !strcmp( psz_name, "tid" ) )
 909         {
 910             i_tid = atoi( psz_value );
 911         }
 912         /* unknown attribute */
 913         else
 914             msg_Warn( p_demux, "invalid <vlc:item> attribute:\"%s\"", psz_name);
 915
 916         free( psz_name );
 917         free( psz_value );
 918     }
 919
 920     /* attribute href is mandatory */
 921     if( i_tid < 0 )
 922     {
 923         msg_Warn( p_demux, "<vlc:item> requires \"tid\" attribute" );
 924         return false;
 925     }
 926
 927     if( i_tid >= p_demux->p_sys->i_tracklist_entries )
 928     {
 929         msg_Warn( p_demux, "invalid \"tid\" attribute" );
 930         return false;
 931     }
 932
 933     p_new_input = p_demux->p_sys->pp_tracklist[ i_tid ];
 934     if( p_new_input )
 935     {
 936         input_item_node_AppendItem( p_input_node, p_new_input );
 937         vlc_gc_decref( p_new_input );
 938         p_demux->p_sys->pp_tracklist[i_tid] = NULL;
 939     }
 940
 941     /* kludge for #1293 - XTAG sends ENDELEM for self closing tag */
 942     /* (libxml sends NONE) */
 943     xml_ReaderRead( p_xml_reader );
 944
 945     return true;
 946 }
 947
 948 /**
 949  * \brief skips complex element content that we can't manage
 950  */
 951 static bool skip_element COMPLEX_INTERFACE
 952 {
 953     VLC_UNUSED(p_demux); VLC_UNUSED(p_input_node);
 954
 955     while( xml_ReaderRead( p_xml_reader ) == 1 )
 956     {
 957         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 958         {
 959             char *psz_endname = xml_ReaderName( p_xml_reader );
 960             if( !psz_endname )
 961                 return false;
 962             if( !strcmp( psz_element, psz_endname ) )
 963             {
 964                 free( psz_endname );
 965                 return true;
 966             }
 967             else
 968                 free( psz_endname );
 969         }
 970     }
 971     return false;
 972 }