modules/demux/playlist/xspf.c

   1 /*******************************************************************************
   2  * xspf.c : XSPF playlist import functions
   3  *******************************************************************************
   4  * Copyright (C) 2006-2017 VLC authors and VideoLAN
   5  *
   6  * Authors: Daniel Stränger <vlc at schmaller dot de>
   7  *          Yoann Peronneau <yoann@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  ******************************************************************************/
  23 /**
  24  * \file modules/demux/playlist/xspf.c
  25  * \brief XSPF playlist import functions
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_access.h>
  34
  35 #include <vlc_xml.h>
  36 #include <vlc_arrays.h>
  37 #include <vlc_strings.h>
  38 #include <vlc_url.h>
  39 #include "playlist.h"
  40
  41 #include <limits.h>
  42
  43 #define SIMPLE_INTERFACE  (input_item_t    *p_input,\
  44                            const char      *psz_name,\
  45                            char            *psz_value,\
  46                            void            *opaque)
  47 #define COMPLEX_INTERFACE (stream_t           *p_stream,\
  48                            input_item_node_t  *p_input_node,\
  49                            xml_reader_t       *p_xml_reader,\
  50                            const char         *psz_element,\
  51                            bool                b_empty_node)
  52
  53 /* prototypes */
  54 static bool parse_playlist_node COMPLEX_INTERFACE;
  55 static bool parse_tracklist_node COMPLEX_INTERFACE;
  56 static bool parse_track_node COMPLEX_INTERFACE;
  57 static bool parse_extension_node COMPLEX_INTERFACE;
  58 static bool parse_extitem_node COMPLEX_INTERFACE;
  59 static bool set_item_info SIMPLE_INTERFACE;
  60 static bool set_option SIMPLE_INTERFACE;
  61 static bool skip_element COMPLEX_INTERFACE;
  62
  63 /* datatypes */
  64 typedef struct
  65 {
  66     const char *name;
  67     union
  68     {
  69         bool (*smpl) SIMPLE_INTERFACE;
  70         bool (*cmplx) COMPLEX_INTERFACE;
  71     } pf_handler;
  72     bool cmplx;
  73 } xml_elem_hnd_t;
  74
  75 typedef struct
  76 {
  77     input_item_t **pp_tracklist;
  78     int i_tracklist_entries;
  79     int i_track_id;
  80     char * psz_base;
  81 } xspf_sys_t;
  82
  83 static int ReadDir(stream_t *, input_item_node_t *);
  84
  85 /**
  86  * \brief XSPF submodule initialization function
  87  */
  88 int Import_xspf(vlc_object_t *p_this)
  89 {
  90     stream_t *p_stream = (stream_t *)p_this;
  91
  92     CHECK_FILE(p_stream);
  93
  94     if( !stream_HasExtension( p_stream, ".xspf" )
  95      && !stream_IsMimeType( p_stream->p_source, "application/xspf+xml" ) )
  96         return VLC_EGENERIC;
  97
  98     xspf_sys_t *sys = calloc(1, sizeof (*sys));
  99     if (unlikely(sys == NULL))
 100         return VLC_ENOMEM;
 101
 102     msg_Dbg(p_stream, "using XSPF playlist reader");
 103     p_stream->p_sys = sys;
 104     p_stream->pf_readdir = ReadDir;
 105     p_stream->pf_control = access_vaDirectoryControlHelper;
 106
 107     return VLC_SUCCESS;
 108 }
 109
 110 void Close_xspf(vlc_object_t *p_this)
 111 {
 112     stream_t *p_stream = (stream_t *)p_this;
 113     xspf_sys_t *p_sys = p_stream->p_sys;
 114     for (int i = 0; i < p_sys->i_tracklist_entries; i++)
 115         if (p_sys->pp_tracklist[i])
 116             input_item_Release(p_sys->pp_tracklist[i]);
 117     free(p_sys->pp_tracklist);
 118     free(p_sys->psz_base);
 119     free(p_sys);
 120 }
 121
 122 /**
 123  * \brief demuxer function for XSPF parsing
 124  */
 125 static int ReadDir(stream_t *p_stream, input_item_node_t *p_subitems)
 126 {
 127     xspf_sys_t *sys = p_stream->p_sys;
 128     int i_ret = -1;
 129     xml_reader_t *p_xml_reader = NULL;
 130     const char *name = NULL;
 131
 132     sys->pp_tracklist = NULL;
 133     sys->i_tracklist_entries = 0;
 134     sys->i_track_id = -1;
 135     sys->psz_base = strdup(p_stream->psz_url);
 136
 137     /* create new xml parser from stream */
 138     p_xml_reader = xml_ReaderCreate(p_stream, p_stream->p_source);
 139     if (!p_xml_reader)
 140         goto end;
 141
 142     /* locating the root node */
 143     if (xml_ReaderNextNode(p_xml_reader, &name) != XML_READER_STARTELEM)
 144     {
 145         msg_Err(p_stream, "can't read xml stream");
 146         goto end;
 147     }
 148
 149     /* checking root node name */
 150     if (strcmp(name, "playlist"))
 151     {
 152         msg_Err(p_stream, "invalid root node name <%s>", name);
 153         goto end;
 154     }
 155
 156     if(xml_ReaderIsEmptyElement(p_xml_reader))
 157         goto end;
 158
 159     i_ret = parse_playlist_node(p_stream, p_subitems,
 160                                  p_xml_reader, "playlist", false ) ? 0 : -1;
 161
 162     for (int i = 0 ; i < sys->i_tracklist_entries ; i++)
 163     {
 164         input_item_t *p_new_input = sys->pp_tracklist[i];
 165         if (p_new_input)
 166         {
 167             input_item_node_AppendItem(p_subitems, p_new_input);
 168         }
 169     }
 170
 171 end:
 172     if (p_xml_reader)
 173         xml_ReaderDelete(p_xml_reader);
 174     return i_ret; /* Needed for correct operation of go back */
 175 }
 176
 177 static const xml_elem_hnd_t *get_handler(const xml_elem_hnd_t *tab, size_t n, const char *name)
 178 {
 179     for (size_t i = 0; i < n; i++)
 180         if (!strcmp(name, tab[i].name))
 181             return &tab[i];
 182     return NULL;
 183 }
 184
 185 static const char *get_node_attribute(xml_reader_t *p_xml_reader, const char *psz_name)
 186 {
 187     const char *name, *value;
 188     while ((name = xml_ReaderNextAttr(p_xml_reader, &value)) != NULL)
 189     {
 190         if (!strcmp(name, psz_name))
 191             return value;
 192     }
 193     return NULL;
 194 }
 195
 196 /**
 197  * \brief generic node parsing of a XSPF playlist
 198  * \param p_stream stream instance
 199  * \param input_item_node_t current input node
 200  * \param p_input_item current input item
 201  * \param p_xml_reader xml reader instance
 202  * \param psz_root_node current node name to parse
 203  * \param pl_elements xml_elem_hnd_t handlers array
 204  * \param i_pl_elements xml_elem_hnd_t array count
 205  */
 206 static bool parse_node(stream_t *p_stream,
 207                        input_item_node_t *p_input_node, input_item_t *p_input_item,
 208                        xml_reader_t *p_xml_reader, const char *psz_root_node,
 209                        const xml_elem_hnd_t *pl_elements, size_t i_pl_elements)
 210 {
 211     bool b_ret = false;
 212
 213     char *psz_value = NULL;
 214     const char *name;
 215     int i_node;
 216     const xml_elem_hnd_t *p_handler = NULL;
 217
 218     while ((i_node = xml_ReaderNextNode(p_xml_reader, &name)) > XML_READER_NONE)
 219     {
 220         const bool b_empty = xml_ReaderIsEmptyElement(p_xml_reader);
 221
 222         switch (i_node)
 223         {
 224             case XML_READER_STARTELEM:
 225                 FREENULL(psz_value);
 226                 if (!*name)
 227                 {
 228                     msg_Err(p_stream, "invalid XML stream");
 229                     goto end;
 230                 }
 231
 232                 p_handler = get_handler(pl_elements, i_pl_elements, name);
 233                 if (!p_handler)
 234                 {
 235                     msg_Warn(p_stream, "skipping unexpected element <%s>", name);
 236                     if(!skip_element(NULL, NULL, p_xml_reader, name, b_empty))
 237                         return false;
 238                 }
 239                 else
 240                 {
 241                     /* complex content is parsed in a separate function */
 242                     if (p_handler->cmplx)
 243                     {
 244                         if (!p_handler->pf_handler.cmplx(p_stream, p_input_node,
 245                                                          p_xml_reader, p_handler->name,
 246                                                          b_empty))
 247                             return false;
 248                         /* Complex reader does read the named end element */
 249                         p_handler = NULL;
 250                     }
 251                 }
 252                 break;
 253
 254             case XML_READER_TEXT:
 255                 free(psz_value);
 256                 if(!p_handler)
 257                 {
 258                     psz_value = NULL;
 259                 }
 260                 else
 261                 {
 262                     psz_value = strdup(name);
 263                     if (unlikely(!psz_value))
 264                         goto end;
 265                 }
 266                 break;
 267
 268             case XML_READER_ENDELEM:
 269                 /* leave if the current parent node is terminated */
 270                 if (!strcmp(name, psz_root_node))
 271                 {
 272                     b_ret = true;
 273                     goto end;
 274                 }
 275
 276                 if(p_handler)
 277                 {
 278                     /* there MUST have been a start tag for that element name */
 279                     if (strcmp(p_handler->name, name))
 280                     {
 281                         msg_Err(p_stream, "there's no open element left for <%s>", name);
 282                         goto end;
 283                     }
 284
 285                     if (p_handler->pf_handler.smpl)
 286                         p_handler->pf_handler.smpl(p_input_item, p_handler->name,
 287                                                    psz_value, p_stream->p_sys);
 288
 289                     free(psz_value);
 290                     psz_value = NULL;
 291                     p_handler = NULL;
 292                 }
 293                 break;
 294         }
 295     }
 296
 297 end:
 298     free(psz_value);
 299
 300     return b_ret;
 301 }
 302
 303 /**
 304  * \brief parse the root node of a XSPF playlist
 305  * \param p_stream stream instance
 306  * \param p_input_item current input item
 307  * \param p_xml_reader xml reader instance
 308  * \param psz_element name of element to parse
 309  */
 310 static bool parse_playlist_node COMPLEX_INTERFACE
 311 {
 312     xspf_sys_t *sys = p_stream->p_sys;
 313
 314     if(b_empty_node)
 315         return false;
 316
 317     /* read all playlist attributes */
 318     const char *psz_version = get_node_attribute(p_xml_reader, "version");
 319     if(!psz_version || (strcmp(psz_version, "0") && strcmp(psz_version, "1")))
 320     {
 321         /* attribute version is mandatory !!! */
 322         if(!psz_version)
 323             msg_Warn(p_stream, "<playlist> requires \"version\" attribute");
 324         else
 325             msg_Warn(p_stream, "unsupported XSPF version %s", psz_version);
 326         return false;
 327     }
 328
 329     const char *psz_base = get_node_attribute(p_xml_reader, "xml:base");
 330     if(psz_base)
 331     {
 332         free(sys->psz_base);
 333         sys->psz_base = strdup(psz_base);
 334     }
 335
 336     static const xml_elem_hnd_t pl_elements[] =
 337         { {"title",        {.smpl = set_item_info}, false },
 338           {"creator",      {.smpl = set_item_info}, false },
 339           {"annotation",   {.smpl = set_item_info}, false },
 340           {"info",         {NULL}, false },
 341           {"location",     {NULL}, false },
 342           {"identifier",   {NULL}, false },
 343           {"image",        {.smpl = set_item_info}, false },
 344           {"date",         {NULL}, false },
 345           {"license",      {NULL}, false },
 346           {"attribution",  {.cmplx = skip_element}, true },
 347           {"link",         {NULL}, false },
 348           {"meta",         {NULL}, false },
 349           {"extension",    {.cmplx = parse_extension_node}, true },
 350           {"trackList",    {.cmplx = parse_tracklist_node}, true },
 351         };
 352
 353     return parse_node(p_stream, p_input_node, p_input_node->p_item,
 354                       p_xml_reader, psz_element,
 355                       pl_elements, ARRAY_SIZE(pl_elements));
 356 }
 357
 358 /**
 359  * \brief parses the tracklist node which only may contain <track>s
 360  */
 361 static bool parse_tracklist_node COMPLEX_INTERFACE
 362 {
 363     VLC_UNUSED(psz_element);
 364
 365     if(b_empty_node)
 366         return true;
 367
 368     /* parse the child elements */
 369     static const xml_elem_hnd_t pl_elements[] =
 370         { {"track",   {.cmplx = parse_track_node}, true },
 371         };
 372
 373     return parse_node(p_stream, p_input_node, p_input_node->p_item,
 374                       p_xml_reader, psz_element,
 375                       pl_elements, ARRAY_SIZE(pl_elements));
 376 }
 377
 378 /**
 379  * \brief handles the <location> elements
 380  */
 381 static bool parse_location SIMPLE_INTERFACE
 382 {
 383     VLC_UNUSED(psz_name);
 384     xspf_sys_t *p_sys = (xspf_sys_t *) opaque;
 385     char* psz_uri = ProcessMRL( psz_value, p_sys->psz_base );
 386     if(psz_uri)
 387     {
 388         input_item_SetURI(p_input, psz_uri);
 389         free(psz_uri);
 390     }
 391     return psz_uri != NULL;
 392 }
 393
 394 /**
 395  * \brief parse one track element
 396  * \param COMPLEX_INTERFACE
 397  */
 398 static bool parse_track_node COMPLEX_INTERFACE
 399 {
 400     xspf_sys_t *p_sys = p_stream->p_sys;
 401
 402     if(b_empty_node)
 403         return true;
 404
 405     input_item_t *p_new_input = input_item_New(NULL, NULL);
 406     if (!p_new_input)
 407         return false;
 408
 409     /* increfs p_new_input */
 410     input_item_node_t *p_new_node = input_item_node_Create(p_new_input);
 411     if(!p_new_node)
 412     {
 413         input_item_Release(p_new_input);
 414         return false;
 415     }
 416
 417     /* reset i_track_id */
 418     p_sys->i_track_id = -1;
 419
 420     static const xml_elem_hnd_t track_elements[] =
 421         { {"location",     {.smpl = parse_location}, false },
 422           {"identifier",   {NULL}, false },
 423           {"title",        {.smpl = set_item_info}, false },
 424           {"creator",      {.smpl = set_item_info}, false },
 425           {"annotation",   {.smpl = set_item_info}, false },
 426           {"info",         {.smpl = set_item_info}, false },
 427           {"image",        {.smpl = set_item_info}, false },
 428           {"album",        {.smpl = set_item_info}, false },
 429           {"trackNum",     {.smpl = set_item_info}, false },
 430           {"duration",     {.smpl = set_item_info}, false },
 431           {"link",         {NULL}, false },
 432           {"meta",         {NULL}, false },
 433           {"extension",    {.cmplx = parse_extension_node}, true },
 434         };
 435
 436     bool b_ret = parse_node(p_stream, p_new_node, p_new_input,
 437                             p_xml_reader, psz_element,
 438                             track_elements, ARRAY_SIZE(track_elements));
 439     if(b_ret)
 440     {
 441         input_item_CopyOptions(p_new_input, p_input_node->p_item);
 442
 443         /* Make sure we have a URI */
 444         char *psz_uri = input_item_GetURI(p_new_input);
 445         if (!psz_uri)
 446             input_item_SetURI(p_new_input, "vlc://nop");
 447         else
 448             free(psz_uri);
 449
 450         if (p_sys->i_track_id < 0 ||
 451             p_sys->i_track_id == INT_MAX ||
 452             (size_t)p_sys->i_track_id >= (SIZE_MAX / sizeof(p_new_input)))
 453         {
 454             input_item_node_AppendNode(p_input_node, p_new_node);
 455             p_new_node = NULL;
 456         }
 457         else
 458         {
 459             /* Extend array as needed */
 460             if (p_sys->i_track_id >= p_sys->i_tracklist_entries)
 461             {
 462                 input_item_t **pp;
 463                 pp = realloc(p_sys->pp_tracklist,
 464                              (p_sys->i_track_id + 1) * sizeof(*pp));
 465                 if (pp)
 466                 {
 467                     p_sys->pp_tracklist = pp;
 468                     while (p_sys->i_track_id >= p_sys->i_tracklist_entries)
 469                         pp[p_sys->i_tracklist_entries++] = NULL;
 470                 }
 471             }
 472
 473             if (p_sys->i_track_id < p_sys->i_tracklist_entries)
 474             {
 475                 input_item_t **pp_insert = &p_sys->pp_tracklist[p_sys->i_track_id];
 476
 477                 if (*pp_insert != NULL)
 478                 {
 479                     msg_Warn(p_stream, "track ID %d collision", p_sys->i_track_id);
 480                     input_item_node_AppendItem(p_input_node, p_new_input);
 481                 }
 482                 else
 483                 {
 484                     *pp_insert = p_new_input;
 485                     p_new_input = NULL;
 486                 }
 487             }
 488             else b_ret = false;
 489         }
 490     }
 491
 492     if(p_new_node)
 493         input_item_node_Delete(p_new_node); /* decrefs p_new_input */
 494     if(p_new_input)
 495         input_item_Release(p_new_input);
 496
 497     return b_ret;
 498 }
 499
 500 /**
 501  * \brief handles the supported <track> sub-elements
 502  */
 503 static bool set_item_info SIMPLE_INTERFACE
 504 {
 505     VLC_UNUSED(opaque);
 506     /* exit if setting is impossible */
 507     if (!psz_name || !psz_value || !p_input)
 508         return false;
 509
 510     vlc_xml_decode(psz_value);
 511
 512     /* handle each info element in a separate "if" clause */
 513     if (!strcmp(psz_name, "title"))
 514         input_item_SetTitle(p_input, psz_value);
 515     else if (!strcmp(psz_name, "creator"))
 516         input_item_SetArtist(p_input, psz_value);
 517     else if (!strcmp(psz_name, "album"))
 518         input_item_SetAlbum(p_input, psz_value);
 519     else if (!strcmp(psz_name, "trackNum"))
 520         input_item_SetTrackNum(p_input, psz_value);
 521     else if (!strcmp(psz_name, "duration"))
 522         p_input->i_duration = atol(psz_value) * INT64_C(1000);
 523     else if (!strcmp(psz_name, "annotation"))
 524         input_item_SetDescription(p_input, psz_value);
 525     else if (!strcmp(psz_name, "info"))
 526         input_item_SetURL(p_input, psz_value);
 527     else if (!strcmp(psz_name, "image") && *psz_value)
 528         input_item_SetArtURL(p_input, psz_value);
 529     return true;
 530 }
 531
 532 /**
 533  * \brief handles the <vlc:option> elements
 534  */
 535 static bool set_option SIMPLE_INTERFACE
 536 {
 537     VLC_UNUSED(opaque);
 538     /* exit if setting is impossible */
 539     if (!psz_name || !psz_value || !p_input)
 540         return false;
 541
 542     vlc_xml_decode(psz_value);
 543
 544     input_item_AddOption(p_input, psz_value, 0);
 545
 546     return true;
 547 }
 548
 549 /**
 550  * \brief handles the <vlc:id> elements
 551  */
 552 static bool parse_vlcid SIMPLE_INTERFACE
 553 {
 554     VLC_UNUSED(p_input); VLC_UNUSED(psz_name);
 555     xspf_sys_t *sys = (xspf_sys_t *) opaque;
 556     if(psz_value)
 557         sys->i_track_id = atoi(psz_value);
 558     return true;
 559 }
 560
 561 /**
 562  * \brief parse the vlc:node of a XSPF playlist
 563  */
 564 static bool parse_vlcnode_node COMPLEX_INTERFACE
 565 {
 566     input_item_t *p_input_item = p_input_node->p_item;
 567     char *psz_title = NULL;
 568
 569     if(b_empty_node)
 570         return true;
 571
 572     /* read all extension node attributes */
 573     const char *psz_attr = get_node_attribute(p_xml_reader, "title");
 574     if(psz_attr)
 575     {
 576         psz_title = strdup(psz_attr);
 577         if (likely(psz_title != NULL))
 578             vlc_xml_decode(psz_title);
 579     }
 580
 581     /* attribute title is mandatory */
 582     if (!psz_title)
 583     {
 584         msg_Warn(p_stream, "<vlc:node> requires \"title\" attribute");
 585         return false;
 586     }
 587     input_item_t *p_new_input =
 588         input_item_NewDirectory("vlc://nop", psz_title, ITEM_NET_UNKNOWN);
 589     free(psz_title);
 590     if (p_new_input)
 591     {
 592         p_input_node =
 593                 input_item_node_AppendItem(p_input_node, p_new_input);
 594         p_input_item = p_new_input;
 595     }
 596
 597     /* parse the child elements */
 598     static const xml_elem_hnd_t pl_elements[] =
 599         { {"vlc:node",   {.cmplx = parse_vlcnode_node}, true },
 600           {"vlc:item",   {.cmplx = parse_extitem_node}, true },
 601           {"vlc:id",     {.smpl = parse_vlcid}, false },
 602           {"vlc:option", {.smpl = set_option}, false },
 603         };
 604
 605     bool b_ret = parse_node(p_stream, p_input_node, p_input_item,
 606                             p_xml_reader, psz_element,
 607                             pl_elements, ARRAY_SIZE(pl_elements));
 608
 609     if (p_new_input)
 610         input_item_Release(p_new_input);
 611
 612     return b_ret;
 613 }
 614
 615 /**
 616  * \brief parse the extension node of a XSPF playlist
 617  */
 618 static bool parse_extension_node COMPLEX_INTERFACE
 619 {
 620     if(b_empty_node)
 621         return false;
 622
 623     const char *psz_application = get_node_attribute(p_xml_reader, "application");
 624     if (!psz_application)
 625     {
 626         msg_Warn(p_stream, "<extension> requires \"application\" attribute");
 627         return false;
 628     }
 629
 630     /* Skip the extension if the application is not vlc
 631            This will skip all children of the current node */
 632     if (strcmp(psz_application, "http://www.videolan.org/vlc/playlist/0"))
 633     {
 634         msg_Dbg(p_stream, "Skipping \"%s\" extension tag", psz_application);
 635         return skip_element( NULL, NULL, p_xml_reader, psz_element, b_empty_node );
 636     }
 637
 638     /* parse the child elements */
 639     static const xml_elem_hnd_t pl_elements[] =
 640         { {"vlc:node",   {.cmplx = parse_vlcnode_node}, true },
 641           {"vlc:id",     {.smpl = parse_vlcid}, false },
 642           {"vlc:option", {.smpl = set_option}, false },
 643         };
 644
 645     return parse_node(p_stream, p_input_node, p_input_node->p_item,
 646                       p_xml_reader, psz_element,
 647                       pl_elements, ARRAY_SIZE(pl_elements));
 648 }
 649
 650 /**
 651  * \brief parse the extension item node of a XSPF playlist
 652  */
 653
 654 static bool parse_extitem_node COMPLEX_INTERFACE
 655 {
 656     VLC_UNUSED(psz_element);
 657     xspf_sys_t *sys = p_stream->p_sys;
 658     input_item_t *p_new_input = NULL;
 659     int i_tid = -1;
 660
 661     if(!b_empty_node)
 662         return false;
 663
 664     const char *psz_tid = get_node_attribute(p_xml_reader, "tid");
 665     if(psz_tid)
 666         i_tid = atoi(psz_tid);
 667
 668     /* attribute href is mandatory */
 669     if (!psz_tid || i_tid < 0)
 670     {
 671         msg_Warn(p_stream, "<vlc:item> requires valid \"tid\" attribute");
 672         return false;
 673     }
 674
 675     if (i_tid >= sys->i_tracklist_entries ||
 676         !(p_new_input = sys->pp_tracklist[ i_tid ]) )
 677     {
 678         msg_Warn(p_stream, "non existing \"tid\" %d referenced", i_tid);
 679         return true;
 680     }
 681
 682     input_item_node_AppendItem(p_input_node, p_new_input);
 683     input_item_Release(p_new_input);
 684     sys->pp_tracklist[i_tid] = NULL;
 685
 686     return true;
 687 }
 688
 689 /**
 690  * \brief skips complex element content that we can't manage
 691  */
 692 static bool skip_element COMPLEX_INTERFACE
 693 {
 694     VLC_UNUSED(p_stream); VLC_UNUSED(p_input_node);
 695
 696     if(b_empty_node)
 697         return true;
 698
 699     const char *name;
 700     for (unsigned lvl = 1; lvl;)
 701         switch (xml_ReaderNextNode(p_xml_reader, &name))
 702         {
 703             case XML_READER_STARTELEM:
 704             {
 705                 if( !xml_ReaderIsEmptyElement( p_xml_reader ) )
 706                     ++lvl;
 707                 break;
 708             }
 709             case XML_READER_ENDELEM:
 710                 if(lvl == 1 &&
 711                     name && psz_element && strcmp(psz_element, name))
 712                         return false;
 713                 lvl--;
 714                 break;
 715             case XML_READER_NONE:
 716             case XML_READER_ERROR:
 717                 return false;
 718         }
 719
 720     return true;
 721 }