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/input.h>
  31 #include <vlc/intf.h>
  32
  33 #include "playlist.h"
  34 #include "vlc_xml.h"
  35 #include "vlc_strings.h"
  36 #include "xspf.h"
  37
  38 struct demux_sys_t
  39 {
  40     playlist_item_t *p_item_in_category;
  41     int i_parent_id;
  42     input_item_t **pp_tracklist;
  43     int i_tracklist_entries;
  44     int i_identifier;
  45 };
  46
  47 /**
  48  * \brief XSPF submodule initialization function
  49  */
  50 int E_(xspf_import_Activate)( vlc_object_t *p_this )
  51 {
  52     demux_t *p_demux = (demux_t *)p_this;
  53     char    *psz_ext;
  54
  55     psz_ext = strrchr( p_demux->psz_path, '.' );
  56
  57     if( ( psz_ext && !strcasecmp( psz_ext, ".xspf") ) ||
  58         ( p_demux->psz_demux && !strcmp(p_demux->psz_demux, "xspf-open") ) )
  59     {
  60         ;
  61     }
  62     else
  63     {
  64         return VLC_EGENERIC;
  65     }
  66     msg_Dbg( p_demux, "using xspf playlist import");
  67
  68     p_demux->p_sys = (demux_sys_t*)malloc(sizeof(demux_sys_t ) );
  69
  70     p_demux->pf_control = xspf_import_Control;
  71     p_demux->pf_demux = xspf_import_Demux;
  72
  73     return VLC_SUCCESS;
  74 }
  75
  76 /**
  77  * \brief demuxer function for XSPF parsing
  78  */
  79 int xspf_import_Demux( demux_t *p_demux )
  80 {
  81     int i_ret = VLC_SUCCESS;
  82     xml_t *p_xml = NULL;
  83     xml_reader_t *p_xml_reader = NULL;
  84     char *psz_name = NULL;
  85     INIT_PLAYLIST_STUFF;
  86     p_demux->p_sys->p_item_in_category = p_item_in_category;
  87     p_demux->p_sys->i_parent_id = i_parent_id;
  88     p_demux->p_sys->pp_tracklist = NULL;
  89     p_demux->p_sys->i_tracklist_entries = 0;
  90     p_demux->p_sys->i_identifier = -1;
  91
  92     /* create new xml parser from stream */
  93     p_xml = xml_Create( p_demux );
  94     if( !p_xml )
  95         i_ret = VLC_ENOMOD;
  96     else
  97     {
  98         p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  99         if( !p_xml_reader )
 100             i_ret = VLC_EGENERIC;
 101     }
 102
 103     /* locating the root node */
 104     if( i_ret == VLC_SUCCESS )
 105     {
 106         do
 107         {
 108             if( xml_ReaderRead( p_xml_reader ) != 1 )
 109             {
 110                 msg_Err( p_demux, "can't read xml stream" );
 111                 i_ret = VLC_EGENERIC;
 112             }
 113         } while( i_ret == VLC_SUCCESS &&
 114                  xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
 115     }
 116     /* checking root node name */
 117     if( i_ret == VLC_SUCCESS )
 118     {
 119         psz_name = xml_ReaderName( p_xml_reader );
 120         if( !psz_name || strcmp( psz_name, "playlist" ) )
 121         {
 122             msg_Err( p_demux, "invalid root node name: %s", psz_name );
 123             i_ret = VLC_EGENERIC;
 124         }
 125         FREE_NAME();
 126     }
 127
 128     i_ret = parse_playlist_node( p_demux, p_playlist, p_current, NULL,
 129                                  p_xml_reader, "playlist" );
 130     HANDLE_PLAY_AND_RELEASE;
 131     if( p_xml_reader )
 132         xml_ReaderDelete( p_xml, p_xml_reader );
 133     if( p_xml )
 134         xml_Delete( p_xml );
 135
 136     return i_ret;
 137     return 0;
 138 }
 139
 140 /** \brief dummy function for demux callback interface */
 141 int xspf_import_Control( demux_t *p_demux, int i_query, va_list args )
 142 {
 143     return VLC_EGENERIC;
 144 }
 145
 146 /**
 147  * \brief parse the root node of a XSPF playlist
 148  * \param p_demux demuxer instance
 149  * \param p_playlist playlist instance
 150  * \param p_item current playlist item
 151  * \param p_input current input item
 152  * \param p_xml_reader xml reader instance
 153  * \param psz_element name of element to parse
 154  */
 155 static vlc_bool_t parse_playlist_node COMPLEX_INTERFACE
 156 {
 157     char *psz_name=NULL;
 158     char *psz_value=NULL;
 159     vlc_bool_t b_version_found = VLC_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,  {NULL} },
 167           {"info",         SIMPLE_CONTENT,  {NULL} },
 168           {"location",     SIMPLE_CONTENT,  {NULL} },
 169           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 170           {"image",        SIMPLE_CONTENT,  {NULL} },
 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 VLC_FALSE;
 191         }
 192         /* attribute: version */
 193         if( !strcmp( psz_name, "version" ) )
 194        {
 195             b_version_found = VLC_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" ) )
 201             ;
 202         /* unknown attribute */
 203         else
 204             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 205
 206         FREE_ATT();
 207     }
 208     /* attribute version is mandatory !!! */
 209     if( !b_version_found )
 210         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 211
 212     /* parse the child elements - we only take care of <trackList> */
 213     while( xml_ReaderRead( p_xml_reader ) == 1 )
 214     {
 215         i_node = xml_ReaderNodeType( p_xml_reader );
 216         switch( i_node )
 217         {
 218             case XML_READER_NONE:
 219                 break;
 220             case XML_READER_STARTELEM:
 221                 /*  element start tag  */
 222                 psz_name = xml_ReaderName( p_xml_reader );
 223                 if( !psz_name || !*psz_name )
 224                 {
 225                     msg_Err( p_demux, "invalid xml stream" );
 226                     FREE_ATT();
 227                     return VLC_FALSE;
 228                 }
 229                 /* choose handler */
 230                 for( p_handler = pl_elements;
 231                      p_handler->name && strcmp( psz_name, p_handler->name );
 232                      p_handler++ );
 233                 if( !p_handler->name )
 234                 {
 235                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 236                     FREE_ATT();
 237                     return VLC_FALSE;
 238                 }
 239                 FREE_NAME();
 240                 /* complex content is parsed in a separate function */
 241                 if( p_handler->type == COMPLEX_CONTENT )
 242                 {
 243                     if( p_handler->pf_handler.cmplx( p_demux,
 244                                                      p_playlist,
 245                                                      p_item,NULL,
 246                                                      p_xml_reader,
 247                                                      p_handler->name ) )
 248                     {
 249                         p_handler = NULL;
 250                         FREE_ATT();
 251                     }
 252                     else
 253                     {
 254                         FREE_ATT();
 255                         return VLC_FALSE;
 256                     }
 257                 }
 258                 break;
 259
 260             case XML_READER_TEXT:
 261                 /* simple element content */
 262                 FREE_ATT();
 263                 psz_value = xml_ReaderValue( p_xml_reader );
 264                 if( !psz_value )
 265                 {
 266                     msg_Err( p_demux, "invalid xml stream" );
 267                     FREE_ATT();
 268                     return VLC_FALSE;
 269                 }
 270                 break;
 271
 272             case XML_READER_ENDELEM:
 273                 /* element end tag */
 274                 psz_name = xml_ReaderName( p_xml_reader );
 275                 if( !psz_name )
 276                 {
 277                     msg_Err( p_demux, "invalid xml stream" );
 278                     FREE_ATT();
 279                     return VLC_FALSE;
 280                 }
 281                 /* leave if the current parent node <playlist> is terminated */
 282                 if( !strcmp( psz_name, psz_element ) )
 283                 {
 284                     FREE_ATT();
 285                     return VLC_TRUE;
 286                 }
 287                 /* there MUST have been a start tag for that element name */
 288                 if( !p_handler || !p_handler->name
 289                     || strcmp( p_handler->name, psz_name ))
 290                 {
 291                     msg_Err( p_demux, "there's no open element left for <%s>",
 292                              psz_name );
 293                     FREE_ATT();
 294                     return VLC_FALSE;
 295                 }
 296
 297                 if( p_handler->pf_handler.smpl )
 298                 {
 299                     p_handler->pf_handler.smpl( p_item, NULL, p_handler->name,
 300                                                 psz_value );
 301                 }
 302                 FREE_ATT();
 303                 p_handler = NULL;
 304                 break;
 305
 306             default:
 307                 /* unknown/unexpected xml node */
 308                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 309                 FREE_ATT();
 310                 return VLC_FALSE;
 311         }
 312         FREE_NAME();
 313     }
 314     return VLC_FALSE;
 315 }
 316
 317 /**
 318  * \brief parses the tracklist node which only may contain <track>s
 319  */
 320 static vlc_bool_t parse_tracklist_node COMPLEX_INTERFACE
 321 {
 322     char *psz_name=NULL;
 323     int i_node;
 324     int i_ntracks = 0;
 325
 326     /* now parse the <track>s */
 327     while( xml_ReaderRead( p_xml_reader ) == 1 )
 328     {
 329         i_node = xml_ReaderNodeType( p_xml_reader );
 330         if( i_node == XML_READER_STARTELEM )
 331         {
 332             psz_name = xml_ReaderName( p_xml_reader );
 333             if( !psz_name )
 334             {
 335                 msg_Err( p_demux, "unexpected end of xml data" );
 336                 FREE_NAME();
 337                 return VLC_FALSE;
 338             }
 339             if( strcmp( psz_name, "track") )
 340             {
 341                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 342                          psz_name );
 343                 FREE_NAME();
 344                 return VLC_FALSE;
 345             }
 346             FREE_NAME();
 347
 348             /* parse the track data in a separate function */
 349             if( parse_track_node( p_demux, p_playlist, p_item, NULL,
 350                                    p_xml_reader,"track" ) == VLC_TRUE )
 351                 i_ntracks++;
 352         }
 353         else if( i_node == XML_READER_ENDELEM )
 354             break;
 355     }
 356
 357     /* the <trackList> has to be terminated */
 358     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 359     {
 360         msg_Err( p_demux, "there's a missing </trackList>" );
 361         FREE_NAME();
 362         return VLC_FALSE;
 363     }
 364     psz_name = xml_ReaderName( p_xml_reader );
 365     if( !psz_name || strcmp( psz_name, "trackList" ) )
 366     {
 367         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 368         FREE_NAME();
 369         return VLC_FALSE;
 370     }
 371     FREE_NAME();
 372
 373     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 374
 375     return VLC_TRUE;
 376 }
 377
 378 /**
 379  * \brief parse one track element
 380  * \param COMPLEX_INTERFACE
 381  */
 382 static vlc_bool_t parse_track_node COMPLEX_INTERFACE
 383 {
 384     input_item_t *p_new_input = NULL;
 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,  {NULL} },
 396           {"info",         SIMPLE_CONTENT,  {NULL} },
 397           {"image",        SIMPLE_CONTENT,  {NULL} },
 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 = skip_element} },
 404           {NULL,           UNKNOWN_CONTENT, {NULL} }
 405         };
 406
 407     while( xml_ReaderRead( p_xml_reader ) == 1 )
 408     {
 409         i_node = xml_ReaderNodeType( p_xml_reader );
 410         switch( i_node )
 411         {
 412             case XML_READER_NONE:
 413                 break;
 414
 415             case XML_READER_STARTELEM:
 416                 /*  element start tag  */
 417                 psz_name = xml_ReaderName( p_xml_reader );
 418                 if( !psz_name || !*psz_name )
 419                 {
 420                     msg_Err( p_demux, "invalid xml stream" );
 421                     FREE_ATT();
 422                     return VLC_FALSE;
 423                 }
 424                 /* choose handler */
 425                 for( p_handler = track_elements;
 426                      p_handler->name && strcmp( psz_name, p_handler->name );
 427                      p_handler++ );
 428                 if( !p_handler->name )
 429                 {
 430                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 431                     FREE_ATT();
 432                     return VLC_FALSE;
 433                 }
 434                 FREE_NAME();
 435                 /* complex content is parsed in a separate function */
 436                 if( p_handler->type == COMPLEX_CONTENT )
 437                 {
 438                     if( !p_new_input )
 439                     {
 440                         msg_Err( p_demux,
 441                                  "at <%s> level no new item has been allocated",
 442                                  p_handler->name );
 443                         FREE_ATT();
 444                         return VLC_FALSE;
 445                     }
 446                     if( p_handler->pf_handler.cmplx( p_demux,
 447                                                      p_playlist,
 448                                                      NULL, p_new_input,
 449                                                      p_xml_reader,
 450                                                      p_handler->name ) )
 451                     {
 452                         p_handler = NULL;
 453                         FREE_ATT();
 454                     }
 455                     else
 456                     {
 457                         FREE_ATT();
 458                         return VLC_FALSE;
 459                     }
 460                 }
 461                 break;
 462
 463             case XML_READER_TEXT:
 464                 /* simple element content */
 465                 FREE_ATT();
 466                 psz_value = xml_ReaderValue( p_xml_reader );
 467                 if( !psz_value )
 468                 {
 469                     msg_Err( p_demux, "invalid xml stream" );
 470                     FREE_ATT();
 471                     return VLC_FALSE;
 472                 }
 473                 break;
 474
 475             case XML_READER_ENDELEM:
 476                 /* element end tag */
 477                 psz_name = xml_ReaderName( p_xml_reader );
 478                 if( !psz_name )
 479                 {
 480                     msg_Err( p_demux, "invalid xml stream" );
 481                     FREE_ATT();
 482                     return VLC_FALSE;
 483                 }
 484                 /* leave if the current parent node <track> is terminated */
 485                 if( !strcmp( psz_name, psz_element ) )
 486                 {
 487                     FREE_ATT();
 488                     /* Add it */
 489                     playlist_AddWhereverNeeded( p_playlist, p_new_input,
 490                               p_item, p_demux->p_sys->p_item_in_category,
 491                               (p_demux->p_sys->i_parent_id >0 ) ? VLC_TRUE:
 492                               VLC_FALSE, PLAYLIST_APPEND );
 493                     if( p_demux->p_sys->i_identifier <
 494                         p_demux->p_sys->i_tracklist_entries )
 495                     {
 496                         p_demux->p_sys->pp_tracklist[
 497                             p_demux->p_sys->i_identifier ] = p_new_input;
 498                     }
 499                     else
 500                     {
 501                         if( p_demux->p_sys->i_identifier >
 502                             p_demux->p_sys->i_tracklist_entries )
 503                         {
 504                             p_demux->p_sys->i_tracklist_entries =
 505                                 p_demux->p_sys->i_identifier;
 506                         }
 507                         INSERT_ELEM( p_demux->p_sys->pp_tracklist,
 508                                      p_demux->p_sys->i_tracklist_entries,
 509                                      p_demux->p_sys->i_tracklist_entries,
 510                                      p_new_input );
 511                     }
 512                     return VLC_TRUE;
 513                 }
 514                 /* there MUST have been a start tag for that element name */
 515                 if( !p_handler || !p_handler->name
 516                     || strcmp( p_handler->name, psz_name ))
 517                 {
 518                     msg_Err( p_demux, "there's no open element left for <%s>",
 519                              psz_name );
 520                     FREE_ATT();
 521                     return VLC_FALSE;
 522                 }
 523
 524                 /* special case: location */
 525                 if( !strcmp( p_handler->name, "location" ) )
 526                 {
 527                     char *psz_uri=NULL;
 528                     /* there MUST NOT be an item */
 529                     if( p_new_input )
 530                     {
 531                         msg_Err( p_demux, "item <%s> already created",
 532                                  psz_name );
 533                         FREE_ATT();
 534                         return VLC_FALSE;
 535                     }
 536                     psz_uri = unescape_URI_duplicate( psz_value );
 537
 538                     if( psz_uri )
 539                     {
 540                         p_new_input = input_ItemNewExt( p_playlist, psz_uri,
 541                                                         NULL, 0, NULL, -1 );
 542                         p_new_input->p_meta = vlc_meta_New();
 543                         free( psz_uri );
 544                         vlc_input_item_CopyOptions( p_item->p_input, p_new_input );
 545                         psz_uri = NULL;
 546                         FREE_ATT();
 547                         p_handler = NULL;
 548                     }
 549                     else
 550                     {
 551                         FREE_ATT();
 552                         return VLC_FALSE;
 553                     }
 554                 }
 555                 else if( !strcmp( p_handler->name, "identifier" ) )
 556                 {
 557                     p_demux->p_sys->i_identifier = atoi( psz_value );
 558                 }
 559                 else
 560                 {
 561                     /* there MUST be an item */
 562                     if( !p_new_input )
 563                     {
 564                         msg_Err( p_demux, "item not yet created at <%s>",
 565                                  psz_name );
 566                         FREE_ATT();
 567                         return VLC_FALSE;
 568                     }
 569                     if( p_handler->pf_handler.smpl )
 570                     {
 571                         p_handler->pf_handler.smpl( NULL, p_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                 FREE_ATT();
 585                 return VLC_FALSE;
 586         }
 587         FREE_NAME();
 588     }
 589     msg_Err( p_demux, "unexpected end of xml data" );
 590     FREE_ATT();
 591     return VLC_FALSE;
 592 }
 593
 594 /**
 595  * \brief handles the supported <track> sub-elements
 596  */
 597 static vlc_bool_t set_item_info SIMPLE_INTERFACE
 598 {
 599     /* exit if setting is impossible */
 600     if( !psz_name || !psz_value || !p_input )
 601         return VLC_FALSE;
 602
 603     /* re-convert xml special characters inside psz_value */
 604     resolve_xml_special_chars( psz_value );
 605
 606     /* handle each info element in a separate "if" clause */
 607     if( !strcmp( psz_name, "title" ) )
 608     {
 609         p_input->psz_name = strdup( (char*)psz_value );
 610     }
 611     else if( !strcmp( psz_name, "creator" ) )
 612     {
 613         vlc_meta_SetArtist( p_input->p_meta, psz_value );
 614     }
 615     else if( !strcmp( psz_name, "album" ) )
 616     {
 617         vlc_meta_SetAlbum( p_input->p_meta, psz_value );
 618
 619     }
 620     else if( !strcmp( psz_name, "trackNum" ) )
 621     {
 622         vlc_meta_SetTracknum( p_input->p_meta, psz_value );
 623     }
 624     else if( !strcmp( psz_name, "duration" ) )
 625     {
 626         long i_num = atol( psz_value );
 627         p_input->i_duration = i_num*1000;
 628     }
 629     return VLC_TRUE;
 630 }
 631
 632
 633 /**
 634  * \brief parse the extension node of a XSPF playlist
 635  */
 636 static vlc_bool_t parse_extension_node COMPLEX_INTERFACE
 637 {
 638     char *psz_name = NULL;
 639     char *psz_value = NULL;
 640     char *psz_title = NULL;
 641     int i_node;
 642     xml_elem_hnd_t *p_handler = NULL;
 643
 644     xml_elem_hnd_t pl_elements[] =
 645         { {"node",  COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 646           {"item",  COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 647           {NULL,    UNKNOWN_CONTENT, {NULL} }
 648         };
 649
 650     /* read all extension node attributes */
 651     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 652     {
 653         psz_name = xml_ReaderName( p_xml_reader );
 654         psz_value = xml_ReaderValue( p_xml_reader );
 655         if( !psz_name || !psz_value )
 656         {
 657             msg_Err( p_demux, "invalid xml stream @ <node>" );
 658             FREE_ATT();
 659             return VLC_FALSE;
 660         }
 661         /* attribute: title */
 662         if( !strcmp( psz_name, "title" ) )
 663         {
 664             psz_title = unescape_URI_duplicate( psz_value );
 665         }
 666         /* unknown attribute */
 667         else
 668             msg_Warn( p_demux, "invalid <node> attribute:\"%s\"", psz_name);
 669
 670         FREE_ATT();
 671     }
 672
 673     /* attribute title is mandatory except for <extension> */
 674     if( !strcmp( psz_element, "node" ) && !psz_title )
 675     {
 676         msg_Warn( p_demux, "<node> requires \"title\" attribute" );
 677         return VLC_FALSE;
 678     }
 679
 680     if( !strcmp( psz_element, "node" ) )
 681     {
 682         fprintf( stderr, "  node: %s\n", psz_title );
 683     }
 684     if( psz_title ) free( psz_title );
 685
 686     /* parse the child elements */
 687     while( xml_ReaderRead( p_xml_reader ) == 1 )
 688     {
 689         i_node = xml_ReaderNodeType( p_xml_reader );
 690         switch( i_node )
 691         {
 692             case XML_READER_NONE:
 693                 break;
 694             case XML_READER_STARTELEM:
 695                 /*  element start tag  */
 696                 psz_name = xml_ReaderName( p_xml_reader );
 697                 if( !psz_name || !*psz_name )
 698                 {
 699                     msg_Err( p_demux, "invalid xml stream" );
 700                     FREE_ATT();
 701                     return VLC_FALSE;
 702                 }
 703                 /* choose handler */
 704                 for( p_handler = pl_elements;
 705                      p_handler->name && strcmp( psz_name, p_handler->name );
 706                      p_handler++ );
 707                 if( !p_handler->name )
 708                 {
 709                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 710                     FREE_ATT();
 711                     return VLC_FALSE;
 712                 }
 713                 FREE_NAME();
 714                 /* complex content is parsed in a separate function */
 715                 if( p_handler->type == COMPLEX_CONTENT )
 716                 {
 717                     if( p_handler->pf_handler.cmplx( p_demux,
 718                                                      p_playlist,
 719                                                      p_item, NULL,
 720                                                      p_xml_reader,
 721                                                      p_handler->name ) )
 722                     {
 723                         p_handler = NULL;
 724                         FREE_ATT();
 725                     }
 726                     else
 727                     {
 728                         FREE_ATT();
 729                         return VLC_FALSE;
 730                     }
 731                 }
 732                 break;
 733
 734             case XML_READER_TEXT:
 735                 /* simple element content */
 736                 FREE_ATT();
 737                 psz_value = xml_ReaderValue( p_xml_reader );
 738                 if( !psz_value )
 739                 {
 740                     msg_Err( p_demux, "invalid xml stream" );
 741                     FREE_ATT();
 742                     return VLC_FALSE;
 743                 }
 744                 break;
 745
 746             case XML_READER_ENDELEM:
 747                 /* element end tag */
 748                 psz_name = xml_ReaderName( p_xml_reader );
 749                 if( !psz_name )
 750                 {
 751                     msg_Err( p_demux, "invalid xml stream" );
 752                     FREE_ATT();
 753                     return VLC_FALSE;
 754                 }
 755                 /* leave if the current parent node is terminated */
 756                 if( !strcmp( psz_name, psz_element ) )
 757                 {
 758                     fprintf( stderr, "  </node>\n" );
 759                     FREE_ATT();
 760                     return VLC_TRUE;
 761                 }
 762                 /* there MUST have been a start tag for that element name */
 763                 if( !p_handler || !p_handler->name
 764                     || strcmp( p_handler->name, psz_name ))
 765                 {
 766                     msg_Err( p_demux, "there's no open element left for <%s>",
 767                              psz_name );
 768                     FREE_ATT();
 769                     return VLC_FALSE;
 770                 }
 771
 772                 if( p_handler->pf_handler.smpl )
 773                 {
 774                     p_handler->pf_handler.smpl( p_item, NULL, p_handler->name,
 775                                                 psz_value );
 776                 }
 777                 FREE_ATT();
 778                 p_handler = NULL;
 779                 break;
 780
 781             default:
 782                 /* unknown/unexpected xml node */
 783                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 784                 FREE_ATT();
 785                 return VLC_FALSE;
 786         }
 787         FREE_NAME();
 788     }
 789     return VLC_FALSE;
 790 }
 791
 792 /**
 793  * \brief parse the extension item node of a XSPF playlist
 794  */
 795 static vlc_bool_t parse_extitem_node COMPLEX_INTERFACE
 796 {
 797     char *psz_name = NULL;
 798     char *psz_value = NULL;
 799     int i_href = -1;
 800
 801     /* read all extension item attributes */
 802     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 803     {
 804         psz_name = xml_ReaderName( p_xml_reader );
 805         psz_value = xml_ReaderValue( p_xml_reader );
 806         if( !psz_name || !psz_value )
 807         {
 808             msg_Err( p_demux, "invalid xml stream @ <item>" );
 809             FREE_ATT();
 810             return VLC_FALSE;
 811         }
 812         /* attribute: href */
 813         if( !strcmp( psz_name, "href" ) )
 814         {
 815             i_href = atoi( psz_value );
 816         }
 817         /* unknown attribute */
 818         else
 819             msg_Warn( p_demux, "invalid <item> attribute:\"%s\"", psz_name);
 820
 821         FREE_ATT();
 822     }
 823
 824     /* attribute href is mandatory */
 825     if( i_href < 0 )
 826     {
 827         msg_Warn( p_demux, "<item> requires \"href\" attribute" );
 828         return VLC_FALSE;
 829     }
 830
 831     if( i_href > p_demux->p_sys->i_tracklist_entries )
 832     {
 833         msg_Warn( p_demux, "invalid \"href\" attribute" );
 834         return VLC_FALSE;
 835     }
 836
 837     fprintf( stderr, "    %s\n", p_demux->p_sys->pp_tracklist[i_href]->psz_name );
 838
 839     return VLC_TRUE;
 840 }
 841
 842 /**
 843  * \brief skips complex element content that we can't manage
 844  */
 845 static vlc_bool_t skip_element COMPLEX_INTERFACE
 846 {
 847     char *psz_endname;
 848
 849     while( xml_ReaderRead( p_xml_reader ) == 1 )
 850     {
 851         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 852         {
 853             psz_endname = xml_ReaderName( p_xml_reader );
 854             if( !psz_endname )
 855                 return VLC_FALSE;
 856             if( !strcmp( psz_element, psz_endname ) )
 857             {
 858                 free( psz_endname );
 859                 return VLC_TRUE;
 860             }
 861             else
 862                 free( psz_endname );
 863         }
 864     }
 865     return VLC_FALSE;
 866 }