git.sesse.net Git - vlc/blob - modules/demux/playlist/xspf.c

   1 /*******************************************************************************
   2  * xspf.c : XSPF playlist import functions
   3  *******************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Daniel Stränger <vlc at schmaller dot de>
   8  *          Yoann Peronneau <yoann@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *******************************************************************************/
  24 /**
  25  * \file modules/demux/playlist/xspf.c
  26  * \brief XSPF playlist import functions
  27  */
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_demux.h>
  31
  32 #include "playlist.h"
  33 #include "vlc_xml.h"
  34 #include "vlc_strings.h"
  35 #include "vlc_url.h"
  36 #include "xspf.h"
  37
  38 struct demux_sys_t
  39 {
  40     playlist_item_t *p_item_in_category;
  41     input_item_t **pp_tracklist;
  42     int i_tracklist_entries;
  43     int i_identifier;
  44     char * psz_base;
  45 };
  46
  47 static int Control( demux_t *, int, va_list );
  48 static int Demux( demux_t * );
  49
  50 /**
  51  * \brief XSPF submodule initialization function
  52  */
  53 int E_(Import_xspf)( vlc_object_t *p_this )
  54 {
  55     DEMUX_BY_EXTENSION_OR_FORCED_MSG( ".xspf", "xspf-open",
  56                                       "using XSPF playlist reader" );
  57     return VLC_SUCCESS;
  58 }
  59
  60 void E_(Close_xspf)( vlc_object_t *p_this )
  61 {
  62     demux_t *p_demux = (demux_t *)p_this;
  63     FREENULL( p_demux->p_sys->pp_tracklist );
  64     FREENULL( p_demux->p_sys->psz_base );
  65     free( p_demux->p_sys );
  66 }
  67
  68 /**
  69  * \brief demuxer function for XSPF parsing
  70  */
  71 int Demux( demux_t *p_demux )
  72 {
  73     int i_ret = VLC_SUCCESS;
  74     xml_t *p_xml = NULL;
  75     xml_reader_t *p_xml_reader = NULL;
  76     char *psz_name = NULL;
  77     INIT_PLAYLIST_STUFF;
  78     p_demux->p_sys->pp_tracklist = NULL;
  79     p_demux->p_sys->i_tracklist_entries = 0;
  80     p_demux->p_sys->i_identifier = 0;
  81     p_demux->p_sys->psz_base = NULL;
  82
  83     /* create new xml parser from stream */
  84     p_xml = xml_Create( p_demux );
  85     if( !p_xml )
  86         i_ret = VLC_ENOMOD;
  87     else
  88     {
  89         p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  90         if( !p_xml_reader )
  91             i_ret = VLC_EGENERIC;
  92     }
  93
  94     /* locating the root node */
  95     if( i_ret == VLC_SUCCESS )
  96     {
  97         do
  98         {
  99             if( xml_ReaderRead( p_xml_reader ) != 1 )
 100             {
 101                 msg_Err( p_demux, "can't read xml stream" );
 102                 i_ret = VLC_EGENERIC;
 103             }
 104         } while( i_ret == VLC_SUCCESS &&
 105                  xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
 106     }
 107     /* checking root node name */
 108     if( i_ret == VLC_SUCCESS )
 109     {
 110         psz_name = xml_ReaderName( p_xml_reader );
 111         if( !psz_name || strcmp( psz_name, "playlist" ) )
 112         {
 113             msg_Err( p_demux, "invalid root node name: %s", psz_name );
 114             i_ret = VLC_EGENERIC;
 115         }
 116         FREE_NAME();
 117     }
 118
 119     if( i_ret == VLC_SUCCESS )
 120         i_ret = parse_playlist_node( p_demux, p_playlist, p_current_input,
 121                                      p_xml_reader, "playlist" );
 122     HANDLE_PLAY_AND_RELEASE;
 123     if( p_xml_reader )
 124         xml_ReaderDelete( p_xml, p_xml_reader );
 125     if( p_xml )
 126         xml_Delete( p_xml );
 127     return i_ret; /* Needed for correct operation of go back */
 128 }
 129
 130 /** \brief dummy function for demux callback interface */
 131 static int Control( demux_t *p_demux, int i_query, va_list args )
 132 {
 133     return VLC_EGENERIC;
 134 }
 135
 136 /**
 137  * \brief parse the root node of a XSPF playlist
 138  * \param p_demux demuxer instance
 139  * \param p_playlist playlist instance
 140  * \param p_input_item current input item
 141  * \param p_xml_reader xml reader instance
 142  * \param psz_element name of element to parse
 143  */
 144 static vlc_bool_t parse_playlist_node COMPLEX_INTERFACE
 145 {
 146     char *psz_name=NULL;
 147     char *psz_value=NULL;
 148     vlc_bool_t b_version_found = VLC_FALSE;
 149     int i_node;
 150     xml_elem_hnd_t *p_handler=NULL;
 151
 152     xml_elem_hnd_t pl_elements[] =
 153         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 154           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 155           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 156           {"info",         SIMPLE_CONTENT,  {NULL} },
 157           {"location",     SIMPLE_CONTENT,  {NULL} },
 158           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 159           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 160           {"date",         SIMPLE_CONTENT,  {NULL} },
 161           {"license",      SIMPLE_CONTENT,  {NULL} },
 162           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 163           {"link",         SIMPLE_CONTENT,  {NULL} },
 164           {"meta",         SIMPLE_CONTENT,  {NULL} },
 165           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 166           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 167           {NULL,           UNKNOWN_CONTENT, {NULL} }
 168         };
 169
 170     /* read all playlist attributes */
 171     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 172     {
 173         psz_name = xml_ReaderName( p_xml_reader );
 174         psz_value = xml_ReaderValue( p_xml_reader );
 175         if( !psz_name || !psz_value )
 176         {
 177             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 178             FREE_ATT();
 179             return VLC_FALSE;
 180         }
 181         /* attribute: version */
 182         if( !strcmp( psz_name, "version" ) )
 183         {
 184             b_version_found = VLC_TRUE;
 185             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 186                 msg_Warn( p_demux, "unsupported XSPF version" );
 187         }
 188         /* attribute: xmlns */
 189         else if( !strcmp( psz_name, "xmlns" ) )
 190             ;
 191         else if( !strcmp( psz_name, "xml:base" ) )
 192         {
 193             p_demux->p_sys->psz_base = decode_URI_duplicate( psz_value );
 194         }
 195         /* unknown attribute */
 196         else
 197             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 198
 199         FREE_ATT();
 200     }
 201     /* attribute version is mandatory !!! */
 202     if( !b_version_found )
 203         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 204
 205     /* parse the child elements - we only take care of <trackList> */
 206     while( xml_ReaderRead( p_xml_reader ) == 1 )
 207     {
 208         i_node = xml_ReaderNodeType( p_xml_reader );
 209         switch( i_node )
 210         {
 211             case XML_READER_NONE:
 212                 break;
 213             case XML_READER_STARTELEM:
 214                 /*  element start tag  */
 215                 psz_name = xml_ReaderName( p_xml_reader );
 216                 if( !psz_name || !*psz_name )
 217                 {
 218                     msg_Err( p_demux, "invalid xml stream" );
 219                     FREE_ATT();
 220                     return VLC_FALSE;
 221                 }
 222                 /* choose handler */
 223                 for( p_handler = pl_elements;
 224                      p_handler->name && strcmp( psz_name, p_handler->name );
 225                      p_handler++ );
 226                 if( !p_handler->name )
 227                 {
 228                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 229                     FREE_ATT();
 230                     return VLC_FALSE;
 231                 }
 232                 FREE_NAME();
 233                 /* complex content is parsed in a separate function */
 234                 if( p_handler->type == COMPLEX_CONTENT )
 235                 {
 236                     if( p_handler->pf_handler.cmplx( p_demux,
 237                                                      p_playlist,
 238                                                      p_input_item,
 239                                                      p_xml_reader,
 240                                                      p_handler->name ) )
 241                     {
 242                         p_handler = NULL;
 243                         FREE_ATT();
 244                     }
 245                     else
 246                     {
 247                         FREE_ATT();
 248                         return VLC_FALSE;
 249                     }
 250                 }
 251                 break;
 252
 253             case XML_READER_TEXT:
 254                 /* simple element content */
 255                 FREE_ATT();
 256                 psz_value = xml_ReaderValue( p_xml_reader );
 257                 if( !psz_value )
 258                 {
 259                     msg_Err( p_demux, "invalid xml stream" );
 260                     FREE_ATT();
 261                     return VLC_FALSE;
 262                 }
 263                 break;
 264
 265             case XML_READER_ENDELEM:
 266                 /* element end tag */
 267                 psz_name = xml_ReaderName( p_xml_reader );
 268                 if( !psz_name )
 269                 {
 270                     msg_Err( p_demux, "invalid xml stream" );
 271                     FREE_ATT();
 272                     return VLC_FALSE;
 273                 }
 274                 /* leave if the current parent node <playlist> is terminated */
 275                 if( !strcmp( psz_name, psz_element ) )
 276                 {
 277                     FREE_ATT();
 278                     return VLC_TRUE;
 279                 }
 280                 /* there MUST have been a start tag for that element name */
 281                 if( !p_handler || !p_handler->name
 282                     || strcmp( p_handler->name, psz_name ))
 283                 {
 284                     msg_Err( p_demux, "there's no open element left for <%s>",
 285                              psz_name );
 286                     FREE_ATT();
 287                     return VLC_FALSE;
 288                 }
 289
 290                 if( p_handler->pf_handler.smpl )
 291                 {
 292                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 293                                                 psz_value );
 294                 }
 295                 FREE_ATT();
 296                 p_handler = NULL;
 297                 break;
 298
 299             default:
 300                 /* unknown/unexpected xml node */
 301                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 302                 FREE_ATT();
 303                 return VLC_FALSE;
 304         }
 305         FREE_NAME();
 306     }
 307     return VLC_FALSE;
 308 }
 309
 310 /**
 311  * \brief parses the tracklist node which only may contain <track>s
 312  */
 313 static vlc_bool_t parse_tracklist_node COMPLEX_INTERFACE
 314 {
 315     char *psz_name=NULL;
 316     int i_node;
 317     int i_ntracks = 0;
 318
 319     /* now parse the <track>s */
 320     while( xml_ReaderRead( p_xml_reader ) == 1 )
 321     {
 322         i_node = xml_ReaderNodeType( p_xml_reader );
 323         if( i_node == XML_READER_STARTELEM )
 324         {
 325             psz_name = xml_ReaderName( p_xml_reader );
 326             if( !psz_name )
 327             {
 328                 msg_Err( p_demux, "unexpected end of xml data" );
 329                 FREE_NAME();
 330                 return VLC_FALSE;
 331             }
 332             if( strcmp( psz_name, "track") )
 333             {
 334                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 335                          psz_name );
 336                 FREE_NAME();
 337                 return VLC_FALSE;
 338             }
 339             FREE_NAME();
 340
 341             /* parse the track data in a separate function */
 342             if( parse_track_node( p_demux, p_playlist, p_input_item,
 343                                    p_xml_reader,"track" ) == VLC_TRUE )
 344                 i_ntracks++;
 345         }
 346         else if( i_node == XML_READER_ENDELEM )
 347             break;
 348     }
 349
 350     /* the <trackList> has to be terminated */
 351     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 352     {
 353         msg_Err( p_demux, "there's a missing </trackList>" );
 354         FREE_NAME();
 355         return VLC_FALSE;
 356     }
 357     psz_name = xml_ReaderName( p_xml_reader );
 358     if( !psz_name || strcmp( psz_name, "trackList" ) )
 359     {
 360         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 361         FREE_NAME();
 362         return VLC_FALSE;
 363     }
 364     FREE_NAME();
 365
 366     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 367
 368     return VLC_TRUE;
 369 }
 370
 371 /**
 372  * \brief parse one track element
 373  * \param COMPLEX_INTERFACE
 374  */
 375 static vlc_bool_t parse_track_node COMPLEX_INTERFACE
 376 {
 377     input_item_t *p_new_input = NULL;
 378     int i_node;
 379     char *psz_name=NULL;
 380     char *psz_value=NULL;
 381     xml_elem_hnd_t *p_handler=NULL;
 382
 383     xml_elem_hnd_t track_elements[] =
 384         { {"location",     SIMPLE_CONTENT,  {NULL} },
 385           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 386           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 387           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 388           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 389           {"info",         SIMPLE_CONTENT,  {NULL} },
 390           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 391           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 392           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 393           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 394           {"link",         SIMPLE_CONTENT,  {NULL} },
 395           {"meta",         SIMPLE_CONTENT,  {NULL} },
 396           {"extension",    COMPLEX_CONTENT, {.cmplx = skip_element} },
 397           {NULL,           UNKNOWN_CONTENT, {NULL} }
 398         };
 399
 400     while( xml_ReaderRead( p_xml_reader ) == 1 )
 401     {
 402         i_node = xml_ReaderNodeType( p_xml_reader );
 403         switch( i_node )
 404         {
 405             case XML_READER_NONE:
 406                 break;
 407
 408             case XML_READER_STARTELEM:
 409                 /*  element start tag  */
 410                 psz_name = xml_ReaderName( p_xml_reader );
 411                 if( !psz_name || !*psz_name )
 412                 {
 413                     msg_Err( p_demux, "invalid xml stream" );
 414                     FREE_ATT();
 415                     return VLC_FALSE;
 416                 }
 417                 /* choose handler */
 418                 for( p_handler = track_elements;
 419                      p_handler->name && strcmp( psz_name, p_handler->name );
 420                      p_handler++ );
 421                 if( !p_handler->name )
 422                 {
 423                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 424                     FREE_ATT();
 425                     return VLC_FALSE;
 426                 }
 427                 FREE_NAME();
 428                 /* complex content is parsed in a separate function */
 429                 if( p_handler->type == COMPLEX_CONTENT )
 430                 {
 431                     if( !p_new_input )
 432                     {
 433                         msg_Err( p_demux,
 434                                  "at <%s> level no new item has been allocated",
 435                                  p_handler->name );
 436                         FREE_ATT();
 437                         return VLC_FALSE;
 438                     }
 439                     if( p_handler->pf_handler.cmplx( p_demux,
 440                                                      p_playlist,
 441                                                      p_new_input,
 442                                                      p_xml_reader,
 443                                                      p_handler->name ) )
 444                     {
 445                         p_handler = NULL;
 446                         FREE_ATT();
 447                     }
 448                     else
 449                     {
 450                         FREE_ATT();
 451                         return VLC_FALSE;
 452                     }
 453                 }
 454                 break;
 455
 456             case XML_READER_TEXT:
 457                 /* simple element content */
 458                 FREE_ATT();
 459                 psz_value = xml_ReaderValue( p_xml_reader );
 460                 if( !psz_value )
 461                 {
 462                     msg_Err( p_demux, "invalid xml stream" );
 463                     FREE_ATT();
 464                     return VLC_FALSE;
 465                 }
 466                 break;
 467
 468             case XML_READER_ENDELEM:
 469                 /* element end tag */
 470                 psz_name = xml_ReaderName( p_xml_reader );
 471                 if( !psz_name )
 472                 {
 473                     msg_Err( p_demux, "invalid xml stream" );
 474                     FREE_ATT();
 475                     return VLC_FALSE;
 476                 }
 477                 /* leave if the current parent node <track> is terminated */
 478                 if( !strcmp( psz_name, psz_element ) )
 479                 {
 480                     FREE_ATT();
 481                     if( p_demux->p_sys->i_identifier <
 482                         p_demux->p_sys->i_tracklist_entries )
 483                     {
 484                         p_demux->p_sys->pp_tracklist[
 485                             p_demux->p_sys->i_identifier ] = p_new_input;
 486                     }
 487                     else
 488                     {
 489                         if( p_demux->p_sys->i_identifier >
 490                             p_demux->p_sys->i_tracklist_entries )
 491                         {
 492                             p_demux->p_sys->i_tracklist_entries =
 493                                 p_demux->p_sys->i_identifier;
 494                         }
 495                         INSERT_ELEM( p_demux->p_sys->pp_tracklist,
 496                                      p_demux->p_sys->i_tracklist_entries,
 497                                      p_demux->p_sys->i_tracklist_entries,
 498                                      p_new_input );
 499                     }
 500                     return VLC_TRUE;
 501                 }
 502                 /* there MUST have been a start tag for that element name */
 503                 if( !p_handler || !p_handler->name
 504                     || strcmp( p_handler->name, psz_name ))
 505                 {
 506                     msg_Err( p_demux, "there's no open element left for <%s>",
 507                              psz_name );
 508                     FREE_ATT();
 509                     return VLC_FALSE;
 510                 }
 511
 512                 /* special case: location */
 513                 if( !strcmp( p_handler->name, "location" ) )
 514                 {
 515                     char *psz_uri=NULL;
 516                     /* there MUST NOT be an item */
 517                     if( p_new_input )
 518                     {
 519                         msg_Err( p_demux, "item <%s> already created",
 520                                  psz_name );
 521                         FREE_ATT();
 522                         return VLC_FALSE;
 523                     }
 524                     psz_uri = decode_URI_duplicate( psz_value );
 525
 526                     if( psz_uri )
 527                     {
 528                         if( p_demux->p_sys->psz_base &&
 529                             !strstr( psz_uri, "://" ) )
 530                         {
 531                            char* psz_tmp = malloc(
 532                                    strlen(p_demux->p_sys->psz_base) +
 533                                    strlen(psz_uri) +1 );
 534                            if( !psz_tmp )
 535                            {
 536                                msg_Err( p_demux, "out of memory");
 537                                return VLC_FALSE;
 538                            }
 539                            sprintf( psz_tmp, "%s%s",
 540                                     p_demux->p_sys->psz_base, psz_uri );
 541                            free( psz_uri );
 542                            psz_uri = psz_tmp;
 543                         }
 544                         p_new_input = input_ItemNewExt( p_playlist, psz_uri,
 545                                                         NULL, 0, NULL, -1 );
 546                         free( psz_uri );
 547                         input_ItemCopyOptions( p_input_item, p_new_input );
 548                         psz_uri = NULL;
 549                         FREE_ATT();
 550                         p_handler = NULL;
 551                     }
 552                     else
 553                     {
 554                         FREE_ATT();
 555                         return VLC_FALSE;
 556                     }
 557                 }
 558                 else if( !strcmp( p_handler->name, "identifier" ) )
 559                 {
 560                     p_demux->p_sys->i_identifier = atoi( psz_value );
 561                 }
 562                 else
 563                 {
 564                     /* there MUST be an item */
 565                     if( !p_new_input )
 566                     {
 567                         msg_Err( p_demux, "item not yet created at <%s>",
 568                                  psz_name );
 569                         FREE_ATT();
 570                         return VLC_FALSE;
 571                     }
 572                     if( p_handler->pf_handler.smpl )
 573                     {
 574                         p_handler->pf_handler.smpl( p_new_input,
 575                                                     p_handler->name,
 576                                                     psz_value );
 577                         FREE_ATT();
 578                     }
 579                 }
 580                 FREE_ATT();
 581                 p_handler = NULL;
 582                 break;
 583
 584             default:
 585                 /* unknown/unexpected xml node */
 586                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 587                 FREE_ATT();
 588                 return VLC_FALSE;
 589         }
 590         FREE_NAME();
 591     }
 592     msg_Err( p_demux, "unexpected end of xml data" );
 593     FREE_ATT();
 594     return VLC_FALSE;
 595 }
 596
 597 /**
 598  * \brief handles the supported <track> sub-elements
 599  */
 600 static vlc_bool_t set_item_info SIMPLE_INTERFACE
 601 {
 602     /* exit if setting is impossible */
 603     if( !psz_name || !psz_value || !p_input )
 604         return VLC_FALSE;
 605
 606
 607     /* re-convert xml special characters inside psz_value */
 608     resolve_xml_special_chars( psz_value );
 609
 610     /* handle each info element in a separate "if" clause */
 611     if( !strcmp( psz_name, "title" ) )
 612     {
 613         input_item_SetTitle( p_input, psz_value );
 614     }
 615     else if( !strcmp( psz_name, "creator" ) )
 616     {
 617         input_item_SetArtist( p_input, psz_value );
 618     }
 619     else if( !strcmp( psz_name, "album" ) )
 620     {
 621         input_item_SetAlbum( p_input, psz_value );
 622
 623     }
 624     else if( !strcmp( psz_name, "trackNum" ) )
 625     {
 626         input_item_SetTrackNum( p_input, psz_value );
 627     }
 628     else if( !strcmp( psz_name, "duration" ) )
 629     {
 630         long i_num = atol( psz_value );
 631         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 632     }
 633     else if( !strcmp( psz_name, "annotation" ) )
 634     {
 635         input_item_SetDescription( p_input, psz_value );
 636     }
 637     else if( !strcmp( psz_name, "image" ) )
 638     {
 639         char *psz_uri = decode_URI_duplicate( psz_value );
 640         input_item_SetArtURL( p_input, psz_uri );
 641         free( psz_uri );
 642     }
 643     return VLC_TRUE;
 644 }
 645
 646
 647 /**
 648  * \brief parse the extension node of a XSPF playlist
 649  */
 650 static vlc_bool_t parse_extension_node COMPLEX_INTERFACE
 651 {
 652     char *psz_name = NULL;
 653     char *psz_value = NULL;
 654     char *psz_title = NULL;
 655     char *psz_application = NULL;
 656     int i_node;
 657     xml_elem_hnd_t *p_handler = NULL;
 658     input_item_t *p_new_input = NULL;
 659
 660     xml_elem_hnd_t pl_elements[] =
 661         { {"node",  COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 662           {"item",  COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 663           {NULL,    UNKNOWN_CONTENT, {NULL} }
 664         };
 665
 666     /* read all extension node attributes */
 667     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 668     {
 669         psz_name = xml_ReaderName( p_xml_reader );
 670         psz_value = xml_ReaderValue( p_xml_reader );
 671         if( !psz_name || !psz_value )
 672         {
 673             msg_Err( p_demux, "invalid xml stream @ <node>" );
 674             FREE_ATT();
 675             return VLC_FALSE;
 676         }
 677         /* attribute: title */
 678         if( !strcmp( psz_name, "title" ) )
 679         {
 680             resolve_xml_special_chars( psz_value );
 681             psz_title = strdup( psz_value );
 682         }
 683         /* extension attribute: application */
 684         else if( !strcmp( psz_name, "application" ) )
 685         {
 686             psz_application = strdup( psz_value );
 687         }
 688         /* unknown attribute */
 689         else
 690             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element, psz_name );
 691
 692         FREE_ATT();
 693     }
 694
 695     /* attribute title is mandatory except for <extension> */
 696     if( !strcmp( psz_element, "node" ) )
 697     {
 698         if( !psz_title )
 699         {
 700             msg_Warn( p_demux, "<node> requires \"title\" attribute" );
 701             return VLC_FALSE;
 702         }
 703         p_new_input = input_ItemNewWithType( VLC_OBJECT( p_playlist ), "vlc:skip",
 704                                 psz_title, 0, NULL, -1, ITEM_TYPE_DIRECTORY );
 705         if( p_new_input )
 706         {
 707             input_ItemAddSubItem( p_input_item, p_new_input );
 708             p_input_item = p_new_input;
 709         }
 710         free( psz_title );
 711     }
 712     else if( !strcmp( psz_element, "extension" ) )
 713     {
 714         if( !psz_application )
 715         {
 716             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 717             return VLC_FALSE;
 718         }
 719         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 720         {
 721             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 722             free( psz_application );
 723             return VLC_FALSE;
 724         }
 725     }
 726     free( psz_application );
 727
 728     /* parse the child elements */
 729     while( xml_ReaderRead( p_xml_reader ) == 1 )
 730     {
 731         i_node = xml_ReaderNodeType( p_xml_reader );
 732         switch( i_node )
 733         {
 734             case XML_READER_NONE:
 735                 break;
 736             case XML_READER_STARTELEM:
 737                 /*  element start tag  */
 738                 psz_name = xml_ReaderName( p_xml_reader );
 739                 if( !psz_name || !*psz_name )
 740                 {
 741                     msg_Err( p_demux, "invalid xml stream" );
 742                     FREE_ATT();
 743                     return VLC_FALSE;
 744                 }
 745                 /* choose handler */
 746                 for( p_handler = pl_elements;
 747                      p_handler->name && strcmp( psz_name, p_handler->name );
 748                      p_handler++ );
 749                 if( !p_handler->name )
 750                 {
 751                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 752                     FREE_ATT();
 753                     return VLC_FALSE;
 754                 }
 755                 FREE_NAME();
 756                 /* complex content is parsed in a separate function */
 757                 if( p_handler->type == COMPLEX_CONTENT )
 758                 {
 759                     if( p_handler->pf_handler.cmplx( p_demux,
 760                                                      p_playlist,
 761                                                      p_input_item,
 762                                                      p_xml_reader,
 763                                                      p_handler->name ) )
 764                     {
 765                         p_handler = NULL;
 766                         FREE_ATT();
 767                     }
 768                     else
 769                     {
 770                         FREE_ATT();
 771                         return VLC_FALSE;
 772                     }
 773                 }
 774                 break;
 775
 776             case XML_READER_TEXT:
 777                 /* simple element content */
 778                 FREE_ATT();
 779                 psz_value = xml_ReaderValue( p_xml_reader );
 780                 if( !psz_value )
 781                 {
 782                     msg_Err( p_demux, "invalid xml stream" );
 783                     FREE_ATT();
 784                     return VLC_FALSE;
 785                 }
 786                 break;
 787
 788             case XML_READER_ENDELEM:
 789                 /* element end tag */
 790                 psz_name = xml_ReaderName( p_xml_reader );
 791                 if( !psz_name )
 792                 {
 793                     msg_Err( p_demux, "invalid xml stream" );
 794                     FREE_ATT();
 795                     return VLC_FALSE;
 796                 }
 797                 /* leave if the current parent node is terminated */
 798                 if( !strcmp( psz_name, psz_element ) )
 799                 {
 800                     FREE_ATT();
 801                     return VLC_TRUE;
 802                 }
 803                 /* there MUST have been a start tag for that element name */
 804                 if( !p_handler || !p_handler->name
 805                     || strcmp( p_handler->name, psz_name ))
 806                 {
 807                     msg_Err( p_demux, "there's no open element left for <%s>",
 808                              psz_name );
 809                     FREE_ATT();
 810                     return VLC_FALSE;
 811                 }
 812
 813                 if( p_handler->pf_handler.smpl )
 814                 {
 815                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 816                                                 psz_value );
 817                 }
 818                 FREE_ATT();
 819                 p_handler = NULL;
 820                 break;
 821
 822             default:
 823                 /* unknown/unexpected xml node */
 824                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 825                 FREE_ATT();
 826                 return VLC_FALSE;
 827         }
 828         FREE_NAME();
 829     }
 830     return VLC_FALSE;
 831 }
 832
 833 /**
 834  * \brief parse the extension item node of a XSPF playlist
 835  */
 836 static vlc_bool_t parse_extitem_node COMPLEX_INTERFACE
 837 {
 838     input_item_t *p_new_input = NULL;
 839     char *psz_name = NULL;
 840     char *psz_value = NULL;
 841     int i_href = -1;
 842
 843     /* read all extension item attributes */
 844     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 845     {
 846         psz_name = xml_ReaderName( p_xml_reader );
 847         psz_value = xml_ReaderValue( p_xml_reader );
 848         if( !psz_name || !psz_value )
 849         {
 850             msg_Err( p_demux, "invalid xml stream @ <item>" );
 851             FREE_ATT();
 852             return VLC_FALSE;
 853         }
 854         /* attribute: href */
 855         if( !strcmp( psz_name, "href" ) )
 856         {
 857             i_href = atoi( psz_value );
 858         }
 859         /* unknown attribute */
 860         else
 861             msg_Warn( p_demux, "invalid <item> attribute:\"%s\"", psz_name);
 862
 863         FREE_ATT();
 864     }
 865
 866     /* attribute href is mandatory */
 867     if( i_href < 0 )
 868     {
 869         msg_Warn( p_demux, "<item> requires \"href\" attribute" );
 870         return VLC_FALSE;
 871     }
 872
 873     if( i_href >= p_demux->p_sys->i_tracklist_entries )
 874     {
 875         msg_Warn( p_demux, "invalid \"href\" attribute" );
 876         return VLC_FALSE;
 877     }
 878
 879     p_new_input = p_demux->p_sys->pp_tracklist[ i_href ];
 880     if( p_new_input )
 881     {
 882         input_ItemAddSubItem( p_input_item, p_new_input );
 883     }
 884
 885     /* fix for #1293 - XTAG sends ENDELEM for self closing tag */
 886     /* (libxml sends NONE) */
 887     xml_ReaderRead( p_xml_reader );
 888
 889     return VLC_TRUE;
 890 }
 891
 892 /**
 893  * \brief skips complex element content that we can't manage
 894  */
 895 static vlc_bool_t skip_element COMPLEX_INTERFACE
 896 {
 897     char *psz_endname;
 898
 899     while( xml_ReaderRead( p_xml_reader ) == 1 )
 900     {
 901         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 902         {
 903             psz_endname = xml_ReaderName( p_xml_reader );
 904             if( !psz_endname )
 905                 return VLC_FALSE;
 906             if( !strcmp( psz_element, psz_endname ) )
 907             {
 908                 free( psz_endname );
 909                 return VLC_TRUE;
 910             }
 911             else
 912                 free( psz_endname );
 913         }
 914     }
 915     return VLC_FALSE;
 916 }