playtree.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 /// \file
  20 /// \ingroup Playtree
  21
  22 #include "config.h"
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #ifdef MP_DEBUG
  29 #include <assert.h>
  30 #endif
  31 #include "m_config.h"
  32 #include "playtree.h"
  33 #include "mp_msg.h"
  34
  35 static int
  36 play_tree_is_valid(play_tree_t* pt);
  37
  38 play_tree_t*
  39 play_tree_new(void) {
  40   play_tree_t* r = calloc(1,sizeof(play_tree_t));
  41   if(r == NULL) {
  42     mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(int)sizeof(play_tree_t));
  43     return NULL;
  44   }
  45   r->entry_type = PLAY_TREE_ENTRY_NODE;
  46   return r;
  47 }
  48
  49 void
  50 play_tree_free(play_tree_t* pt, int children) {
  51   play_tree_t* iter;
  52
  53 #ifdef MP_DEBUG
  54   assert(pt != NULL);
  55 #endif
  56
  57   if(children) {
  58     for(iter = pt->child; iter != NULL; ) {
  59       play_tree_t* nxt=iter->next;
  60       play_tree_free(iter,1);
  61       iter = nxt;
  62     }
  63     pt->child = NULL;
  64   }
  65
  66   play_tree_remove(pt,0,0);
  67
  68   for(iter = pt->child ; iter != NULL ; iter = iter->next)
  69     iter->parent = NULL;
  70
  71   //if(pt->params) free(pt->params);
  72   if(pt->files) {
  73     int i;
  74     for(i = 0 ; pt->files[i] != NULL ; i++)
  75       free(pt->files[i]);
  76     free(pt->files);
  77   }
  78
  79   free(pt);
  80 }
  81
  82 void
  83 play_tree_free_list(play_tree_t* pt, int children) {
  84   play_tree_t* iter;
  85
  86 #ifdef MP_DEBUG
  87   assert(pt != NULL);
  88 #endif
  89
  90   for(iter = pt ; iter->prev != NULL ; iter = iter->prev)
  91     /* NOTHING */;
  92
  93   while(iter) {
  94     play_tree_t* nxt = iter->next;
  95     play_tree_free(iter, children);
  96     iter = nxt;
  97   }
  98
  99
 100 }
 101
 102 void
 103 play_tree_append_entry(play_tree_t* pt, play_tree_t* entry) {
 104   play_tree_t* iter;
 105
 106 #ifdef MP_DEBUG
 107   assert(pt != NULL);
 108   assert(entry != NULL);
 109 #endif
 110
 111   if(pt == entry)
 112     return;
 113
 114   for(iter = pt ; iter->next != NULL ; iter = iter->next)
 115     /* NOTHING */;
 116
 117   entry->parent = iter->parent;
 118   entry->prev = iter;
 119   entry->next = NULL;
 120   iter->next = entry;
 121 }
 122
 123 void
 124 play_tree_prepend_entry(play_tree_t* pt, play_tree_t* entry) {
 125   play_tree_t* iter;
 126
 127 #ifdef MP_DEBUG
 128   assert(pt != NULL);
 129   assert(entry != NULL);
 130 #endif
 131
 132   for(iter = pt ; iter->prev != NULL; iter = iter->prev)
 133     /* NOTHING */;
 134
 135   entry->prev = NULL;
 136   entry->next = iter;
 137   entry->parent = iter->parent;
 138
 139   iter->prev = entry;
 140   if(entry->parent) {
 141 #ifdef MP_DEBUG
 142     assert(entry->parent->child == iter);
 143 #endif
 144     entry->parent->child = entry;
 145   }
 146 }
 147
 148 void
 149 play_tree_insert_entry(play_tree_t* pt, play_tree_t* entry) {
 150
 151 #ifdef MP_DEBUG
 152   assert(pt != NULL);
 153   assert(entry != NULL);
 154 #endif
 155
 156   entry->parent = pt->parent;
 157   entry->prev = pt;
 158   if(pt->next) {
 159 #ifdef MP_DEBUG
 160     assert(pt->next->prev == pt);
 161 #endif
 162     entry->next = pt->next;
 163     entry->next->prev = entry;
 164   } else
 165     entry->next = NULL;
 166   pt->next = entry;
 167
 168 }
 169
 170 void
 171 play_tree_remove(play_tree_t* pt, int free_it, int with_children) {
 172
 173 #ifdef MP_DEBUG
 174   assert(pt != NULL);
 175 #endif
 176
 177   // Middle of list
 178   if(pt->prev && pt->next) {
 179 #ifdef MP_DEBUG
 180     assert(pt->prev->next == pt);
 181     assert(pt->next->prev == pt);
 182 #endif
 183     pt->prev->next = pt->next;
 184     pt->next->prev = pt->prev;
 185   } // End of list
 186   else if(pt->prev) {
 187 #ifdef MP_DEBUG
 188     assert(pt->prev->next == pt);
 189 #endif
 190     pt->prev->next = NULL;
 191   } // Beginning of list
 192   else if(pt->next) {
 193 #ifdef MP_DEBUG
 194     assert(pt->next->prev == pt);
 195 #endif
 196     pt->next->prev = NULL;
 197     if(pt->parent) {
 198 #ifdef MP_DEBUG
 199       assert(pt->parent->child == pt);
 200 #endif
 201       pt->parent->child = pt->next;
 202     }
 203   } // The only one
 204   else if(pt->parent) {
 205 #ifdef MP_DEBUG
 206     assert(pt->parent->child == pt);
 207 #endif
 208     pt->parent->child = NULL;
 209   }
 210
 211   pt->prev = pt->next = pt->parent = NULL;
 212   if(free_it)
 213     play_tree_free(pt,with_children);
 214
 215 }
 216
 217 void
 218 play_tree_set_child(play_tree_t* pt, play_tree_t* child) {
 219   play_tree_t* iter;
 220
 221   /* Roughly validate input data. Both, pt and child are going to be
 222    * dereferenced, hence assure they're not NULL.
 223    */
 224   if (!pt || !child) {
 225     mp_msg(MSGT_PLAYTREE, MSGL_ERR, "Internal error, attempt to add an empty child or use empty playlist\n");
 226     return;
 227   }
 228
 229 #ifdef MP_DEBUG
 230   assert(pt->entry_type == PLAY_TREE_ENTRY_NODE);
 231 #endif
 232
 233   //DEBUG_FF: Where are the children freed?
 234   // Attention in using this function!
 235   for(iter = pt->child ; iter != NULL ; iter = iter->next)
 236     iter->parent = NULL;
 237
 238   // Go back to first one
 239   for(iter = child ; iter->prev != NULL ; iter = iter->prev)
 240     /* NOTHING */;
 241
 242   pt->child = iter;
 243
 244   for( ; iter != NULL ; iter= iter->next)
 245     iter->parent = pt;
 246
 247 }
 248
 249 void
 250 play_tree_set_parent(play_tree_t* pt, play_tree_t* parent) {
 251   play_tree_t* iter;
 252
 253 #ifdef MP_DEBUG
 254   assert(pt != NULL);
 255 #endif
 256
 257   if(pt->parent)
 258     pt->parent->child = NULL;
 259
 260   for(iter = pt ; iter != NULL ; iter = iter->next)
 261     iter->parent = parent;
 262
 263   if(pt->prev) {
 264     for(iter = pt->prev ; iter->prev != NULL ; iter = iter->prev)
 265       iter->parent = parent;
 266     iter->parent = parent;
 267     parent->child = iter;
 268   } else
 269     parent->child = pt;
 270
 271 }
 272
 273
 274 void
 275 play_tree_add_file(play_tree_t* pt,char* file) {
 276   int n = 0;
 277   char* e;
 278
 279 #ifdef MP_DEBUG
 280   assert(pt != NULL);
 281   assert(pt->child == NULL);
 282   assert(file != NULL);
 283 #endif
 284
 285   if(pt->entry_type != PLAY_TREE_ENTRY_NODE &&
 286      pt->entry_type != PLAY_TREE_ENTRY_FILE)
 287     return;
 288
 289   if(pt->files) {
 290     for(n = 0 ; pt->files[n] != NULL ; n++)
 291       /* NOTHING */;
 292   }
 293   pt->files = realloc(pt->files, (n + 2) * sizeof(char*));
 294   if(pt->files ==NULL) {
 295     mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(n+2)*(int)sizeof(char*));
 296     return;
 297   }
 298
 299   e = pt->files[n] = strdup(file);
 300   pt->files[n+1] = NULL;
 301
 302   pt->entry_type = PLAY_TREE_ENTRY_FILE;
 303
 304 }
 305
 306 int
 307 play_tree_remove_file(play_tree_t* pt,char* file) {
 308   int n,f = -1;
 309
 310 #ifdef MP_DEBUG
 311   assert(pt != NULL);
 312   assert(file != NULL);
 313   assert(pt->entry_type != PLAY_TREE_ENTRY_NODE);
 314 #endif
 315
 316   for(n=0 ; pt->files[n] != NULL ; n++) {
 317     if(strcmp(file,pt->files[n]) == 0)
 318       f = n;
 319   }
 320
 321   if(f < 0) // Not found
 322     return 0;
 323
 324 #ifdef MP_DEBUG
 325   assert(n > f);
 326 #endif
 327
 328   free(pt->files[f]);
 329
 330   if(n > 1) {
 331     memmove(&pt->files[f],&pt->files[f+1],(n-f)*sizeof(char*));
 332     pt->files = realloc(pt->files, n * sizeof(char*));
 333     if(pt->files == NULL) {
 334       mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(n+2)*(int)sizeof(char*));
 335       return -1;
 336     }
 337   } else {
 338     free(pt->files);
 339     pt->files = NULL;
 340   }
 341
 342   return 1;
 343 }
 344
 345 void
 346 play_tree_set_param(play_tree_t* pt, char* name, char* val) {
 347   int n = 0;
 348
 349 #ifdef MP_DEBUG
 350   assert(pt != NULL);
 351   assert(name != NULL);
 352 #endif
 353
 354   if(pt->params)
 355     for ( ; pt->params[n].name != NULL ; n++ ) { }
 356
 357   pt->params = realloc(pt->params, (n + 2) * sizeof(play_tree_param_t));
 358   if(pt->params == NULL) {
 359       mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't realloc params (%d bytes of memory)\n",(n+2)*(int)sizeof(play_tree_param_t));
 360       return;
 361   }
 362   pt->params[n].name = strdup(name);
 363   pt->params[n].value = val != NULL ? strdup(val) : NULL;
 364   memset(&pt->params[n+1],0,sizeof(play_tree_param_t));
 365
 366   return;
 367 }
 368
 369 int
 370 play_tree_unset_param(play_tree_t* pt, char* name) {
 371   int n,ni = -1;
 372
 373 #ifdef MP_DEBUG
 374   assert(pt != NULL);
 375   assert(name != NULL);
 376   assert(pt->params != NULL);
 377 #endif
 378
 379   for(n = 0 ; pt->params[n].name != NULL ; n++) {
 380     if(strcasecmp(pt->params[n].name,name) == 0)
 381       ni = n;
 382   }
 383
 384   if(ni < 0)
 385     return 0;
 386
 387   if(pt->params[ni].name) free(pt->params[ni].name);
 388   if(pt->params[ni].value) free(pt->params[ni].value);
 389
 390   if(n > 1) {
 391     memmove(&pt->params[ni],&pt->params[ni+1],(n-ni)*sizeof(play_tree_param_t));
 392     pt->params = realloc(pt->params, n * sizeof(play_tree_param_t));
 393     if(pt->params == NULL) {
 394       mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",n*(int)sizeof(play_tree_param_t));
 395       return -1;
 396     }
 397   } else {
 398     free(pt->params);
 399     pt->params = NULL;
 400   }
 401
 402   return 1;
 403 }
 404
 405 void
 406 play_tree_set_params_from(play_tree_t* dest,play_tree_t* src) {
 407   int i;
 408
 409 #ifdef MP_DEBUG
 410   assert(dest != NULL);
 411   assert(src != NULL);
 412 #endif
 413
 414   if(!src->params)
 415     return;
 416
 417   for(i = 0; src->params[i].name != NULL ; i++)
 418     play_tree_set_param(dest,src->params[i].name,src->params[i].value);
 419   if(src->flags & PLAY_TREE_RND) // pass the random flag too
 420     dest->flags |= PLAY_TREE_RND;
 421
 422 }
 423
 424 static void
 425 play_tree_unset_flag(play_tree_t* pt, int flags , int deep) {
 426   play_tree_t*  i;
 427
 428   pt->flags &= ~flags;
 429
 430   if(deep && pt->child) {
 431     if(deep > 0) deep--;
 432     for(i = pt->child ; i ; i = i->next)
 433       play_tree_unset_flag(i,flags,deep);
 434   }
 435 }
 436
 437
 438 //////////////////////////////////// ITERATOR //////////////////////////////////////
 439
 440 static void
 441 play_tree_iter_push_params(play_tree_iter_t* iter) {
 442   int n;
 443   play_tree_t* pt;
 444 #ifdef MP_DEBUG
 445   assert(iter != NULL);
 446   assert(iter->config != NULL);
 447   assert(iter->tree != NULL);
 448 #endif
 449
 450   pt = iter->tree;
 451
 452   // We always push a config because we can set some option
 453   // while playing
 454   m_config_push(iter->config);
 455
 456   if(pt->params == NULL)
 457     return;
 458
 459
 460   for(n = 0; pt->params[n].name != NULL ; n++) {
 461     int e;
 462     if((e = m_config_set_option(iter->config,pt->params[n].name,pt->params[n].value)) < 0) {
 463       mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Error %d while setting option '%s' with value '%s'\n",e,
 464              pt->params[n].name,pt->params[n].value);
 465     }
 466   }
 467
 468   if(!pt->child)
 469     iter->entry_pushed = 1;
 470   return;
 471 }
 472
 473 play_tree_iter_t*
 474 play_tree_iter_new(play_tree_t* pt,m_config_t* config) {
 475   play_tree_iter_t* iter;
 476
 477 #ifdef MP_DEBUG
 478   assert(pt != NULL);
 479   assert(config != NULL);
 480 #endif
 481
 482   if( ! play_tree_is_valid(pt))
 483     return NULL;
 484
 485   iter = calloc(1,sizeof(play_tree_iter_t));
 486   if(! iter) {
 487       mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate new iterator (%d bytes of memory)\n",(int)sizeof(play_tree_iter_t));
 488       return NULL;
 489   }
 490   iter->root = pt;
 491   iter->tree = NULL;
 492   iter->config = config;
 493
 494   if(pt->parent)
 495     iter->loop = pt->parent->loop;
 496
 497   return iter;
 498 }
 499
 500 void
 501 play_tree_iter_free(play_tree_iter_t* iter) {
 502
 503 #ifdef MP_DEBUG
 504   assert(iter != NULL);
 505 #endif
 506
 507   if(iter->status_stack) {
 508 #ifdef MP_DEBUG
 509     assert(iter->stack_size > 0);
 510 #endif
 511     free(iter->status_stack);
 512   }
 513
 514   free(iter);
 515 }
 516
 517 static play_tree_t*
 518 play_tree_rnd_step(play_tree_t* pt) {
 519   int count = 0;
 520   int r;
 521   play_tree_t *i,*head;
 522
 523   // Count how many free choice we have
 524   for(i = pt ; i->prev ; i = i->prev)
 525     if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
 526   head = i;
 527   if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
 528   for(i = pt->next ; i ; i = i->next)
 529     if(!(i->flags & PLAY_TREE_RND_PLAYED)) count++;
 530
 531   if(!count) return NULL;
 532
 533   r = (int)((float)(count) * rand() / (RAND_MAX + 1.0));
 534
 535   for(i = head ; i  ; i=i->next) {
 536     if(!(i->flags & PLAY_TREE_RND_PLAYED)) r--;
 537     if(r < 0) return i;
 538   }
 539
 540   mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Random stepping error\n");
 541   return NULL;
 542 }
 543
 544
 545 int
 546 play_tree_iter_step(play_tree_iter_t* iter, int d,int with_nodes) {
 547   play_tree_t* pt;
 548
 549   if ( !iter ) return PLAY_TREE_ITER_ENTRY;
 550   if ( !iter->root ) return PLAY_TREE_ITER_ENTRY;
 551
 552 #ifdef MP_DEBUG
 553   assert(iter != NULL);
 554   assert(iter->root != NULL);
 555   //printf("PT : Stepping = %d\n",d);
 556 #endif
 557
 558   if(iter->tree == NULL) {
 559     iter->tree = iter->root;
 560     return play_tree_iter_step(iter,0,with_nodes);
 561   }
 562
 563   if(iter->config && iter->entry_pushed > 0) {
 564     iter->entry_pushed = 0;
 565     m_config_pop(iter->config);
 566   }
 567
 568   if(iter->tree->parent && (iter->tree->parent->flags & PLAY_TREE_RND))
 569     iter->mode = PLAY_TREE_ITER_RND;
 570   else
 571     iter->mode = PLAY_TREE_ITER_NORMAL;
 572
 573   iter->file = -1;
 574   if(iter->mode == PLAY_TREE_ITER_RND)
 575     pt = play_tree_rnd_step(iter->tree);
 576   else if( d > 0 ) {
 577     int i;
 578     pt = iter->tree;
 579     for(i = d ; i > 0 && pt ; i--)
 580       pt = pt->next;
 581     d = i ? i : 1;
 582   } else if(d < 0) {
 583     int i;
 584     pt = iter->tree;
 585     for(i = d ; i < 0 && pt ; i++)
 586       pt = pt->prev;
 587     d = i ? i : -1;
 588   } else
 589     pt = iter->tree;
 590
 591   if(pt == NULL) { // No next
 592     // Must we loop?
 593     if (iter->mode == PLAY_TREE_ITER_RND) {
 594       if (iter->root->loop == 0)
 595         return PLAY_TREE_ITER_END;
 596       play_tree_unset_flag(iter->root, PLAY_TREE_RND_PLAYED, -1);
 597       if (iter->root->loop > 0) iter->root->loop--;
 598       // try again
 599       return play_tree_iter_step(iter, 0, with_nodes);
 600     } else
 601     if(iter->tree->parent && iter->tree->parent->loop != 0 && ((d > 0 && iter->loop != 0) || ( d < 0 && (iter->loop < 0 || iter->loop < iter->tree->parent->loop) ) ) ) {
 602       if(d > 0) { // Go back to the first one
 603         for(pt = iter->tree ; pt->prev != NULL; pt = pt->prev)
 604           /* NOTHNG */;
 605         if(iter->loop > 0) iter->loop--;
 606       } else if( d < 0 ) { // Or the last one
 607         for(pt = iter->tree ; pt->next != NULL; pt = pt->next)
 608           /* NOTHNG */;
 609         if(iter->loop >= 0 && iter->loop < iter->tree->parent->loop) iter->loop++;
 610       }
 611       iter->tree = pt;
 612       return play_tree_iter_step(iter,0,with_nodes);
 613     }
 614     // Go up one level
 615     return play_tree_iter_up_step(iter,d,with_nodes);
 616
 617   }
 618
 619   // Is there any valid child?
 620   if(pt->child && play_tree_is_valid(pt->child)) {
 621     iter->tree = pt;
 622     if(with_nodes) { // Stop on the node
 623       return PLAY_TREE_ITER_NODE;
 624     } else      // Or follow it
 625       return play_tree_iter_down_step(iter,d,with_nodes);
 626   }
 627
 628   // Is it a valid entry?
 629   if(! play_tree_is_valid(pt)) {
 630     if(d == 0) { // Can this happen ? FF: Yes!
 631       mp_msg(MSGT_PLAYTREE,MSGL_ERR,"What to do now ???? Infinite loop if we continue\n");
 632       return PLAY_TREE_ITER_ERROR;
 633     } // Not a valid entry : go to next one
 634     return play_tree_iter_step(iter,d,with_nodes);
 635   }
 636
 637 #ifdef MP_DEBUG
 638   assert(pt->files != NULL);
 639 #endif
 640
 641   iter->tree = pt;
 642
 643   for(d = 0 ; iter->tree->files[d] != NULL ; d++)
 644     /* NOTHING */;
 645   iter->num_files = d;
 646
 647   if(iter->config) {
 648     play_tree_iter_push_params(iter);
 649     iter->entry_pushed = 1;
 650     if(iter->mode == PLAY_TREE_ITER_RND)
 651       pt->flags |= PLAY_TREE_RND_PLAYED;
 652   }
 653
 654   return PLAY_TREE_ITER_ENTRY;
 655
 656 }
 657
 658 static int
 659 play_tree_is_valid(play_tree_t* pt) {
 660   play_tree_t* iter;
 661
 662 #ifdef MP_DEBUG
 663   assert(pt != NULL);
 664 #endif
 665
 666   if(pt->entry_type != PLAY_TREE_ENTRY_NODE) {
 667 #ifdef MP_DEBUG
 668     assert(pt->child == NULL);
 669 #endif
 670     return 1;
 671   }
 672   else if (pt->child != NULL) {
 673     for(iter = pt->child ; iter != NULL ; iter = iter->next) {
 674       if(play_tree_is_valid(iter))
 675         return 1;
 676     }
 677   }
 678   return 0;
 679 }
 680
 681 int
 682 play_tree_iter_up_step(play_tree_iter_t* iter, int d,int with_nodes) {
 683
 684 #ifdef MP_DEBUG
 685   assert(iter != NULL);
 686   assert(iter->tree != NULL);
 687   //printf("PT : Go UP\n");
 688 #endif
 689
 690   iter->file = -1;
 691   if(iter->tree->parent == iter->root->parent)
 692     return PLAY_TREE_ITER_END;
 693
 694 #ifdef MP_DEBUG
 695   assert(iter->tree->parent != NULL);
 696   assert(iter->stack_size > 0);
 697   assert(iter->status_stack != NULL);
 698 #endif
 699
 700   iter->stack_size--;
 701   iter->loop = iter->status_stack[iter->stack_size];
 702   if(iter->stack_size > 0)
 703     iter->status_stack = realloc(iter->status_stack, iter->stack_size * sizeof(int));
 704   else {
 705     free(iter->status_stack);
 706     iter->status_stack = NULL;
 707   }
 708   if(iter->stack_size > 0 && iter->status_stack == NULL) {
 709     mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*(int)sizeof(char*));
 710     return PLAY_TREE_ITER_ERROR;
 711   }
 712   iter->tree = iter->tree->parent;
 713
 714   // Pop subtree params
 715   if(iter->config) {
 716     m_config_pop(iter->config);
 717     if(iter->mode == PLAY_TREE_ITER_RND)
 718       iter->tree->flags |= PLAY_TREE_RND_PLAYED;
 719   }
 720
 721   return play_tree_iter_step(iter,d,with_nodes);
 722 }
 723
 724 int
 725 play_tree_iter_down_step(play_tree_iter_t* iter, int d,int with_nodes) {
 726
 727 #ifdef MP_DEBUG
 728   assert(iter->tree->files == NULL);
 729   assert(iter->tree->child != NULL);
 730   assert(iter->tree->child->parent == iter->tree);
 731   //printf("PT : Go DOWN\n");
 732 #endif
 733
 734   iter->file = -1;
 735
 736   //  Push subtree params
 737   if(iter->config)
 738     play_tree_iter_push_params(iter);
 739
 740   iter->stack_size++;
 741   iter->status_stack = realloc(iter->status_stack, iter->stack_size * sizeof(int));
 742   if(iter->status_stack == NULL) {
 743     mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",iter->stack_size*(int)sizeof(int));
 744     return PLAY_TREE_ITER_ERROR;
 745   }
 746   iter->status_stack[iter->stack_size-1] = iter->loop;
 747   // Set new status
 748   iter->loop = iter->tree->loop-1;
 749   if(d >= 0)
 750     iter->tree = iter->tree->child;
 751   else {
 752     play_tree_t* pt;
 753     for(pt = iter->tree->child ; pt->next != NULL ; pt = pt->next)
 754       /*NOTING*/;
 755     iter->tree = pt;
 756   }
 757
 758   return play_tree_iter_step(iter,0,with_nodes);
 759 }
 760
 761 char*
 762 play_tree_iter_get_file(play_tree_iter_t* iter, int d) {
 763 #ifdef MP_DEBUG
 764   assert(iter != NULL);
 765   assert(iter->tree->child == NULL);
 766 #endif
 767
 768   if(iter->tree->files == NULL)
 769     return NULL;
 770
 771 #ifdef MP_DEBUG
 772   assert(iter->num_files > 0);
 773 #endif
 774
 775   if(iter->file >= iter->num_files-1 || iter->file < -1)
 776     return NULL;
 777
 778   if(d > 0) {
 779     if(iter->file >= iter->num_files - 1)
 780       iter->file = 0;
 781     else
 782       iter->file++;
 783   } else if(d < 0) {
 784     if(iter->file <= 0)
 785       iter->file = iter->num_files - 1;
 786     else
 787       iter->file--;
 788   }
 789   return iter->tree->files[iter->file];
 790 }
 791
 792 play_tree_t*
 793 play_tree_cleanup(play_tree_t* pt) {
 794   play_tree_t* iter, *tmp, *first;
 795
 796 #ifdef MP_DEBUG
 797   assert(pt != NULL);
 798 #endif
 799
 800   if( ! play_tree_is_valid(pt)) {
 801     play_tree_remove(pt,1,1);
 802     return NULL;
 803   }
 804
 805   first = pt->child;
 806
 807   for(iter = pt->child ; iter != NULL ; ) {
 808     tmp = iter;
 809     iter = iter->next;
 810     if(! play_tree_is_valid(tmp)) {
 811       play_tree_remove(tmp,1,1);
 812       if(tmp == first) first = iter;
 813     }
 814   }
 815
 816   for(iter = first ; iter != NULL ; ) {
 817     tmp = iter;
 818     iter = iter->next;
 819     play_tree_cleanup(tmp);
 820   }
 821
 822   return pt;
 823
 824 }
 825
 826 play_tree_iter_t*
 827 play_tree_iter_new_copy(play_tree_iter_t* old) {
 828   play_tree_iter_t* iter;
 829
 830 #ifdef MP_DEBUG
 831   assert(old != NULL);
 832 #endif
 833
 834   iter = malloc(sizeof(play_tree_iter_t));
 835   if(iter == NULL) {
 836     mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",(int)sizeof(play_tree_iter_t));
 837     return NULL;
 838   }
 839 ;
 840   memcpy(iter,old,sizeof(play_tree_iter_t));
 841   if(old->status_stack) {
 842     iter->status_stack = malloc(old->stack_size * sizeof(int));
 843     if(iter->status_stack == NULL) {
 844       mp_msg(MSGT_PLAYTREE,MSGL_ERR,"Can't allocate %d bytes of memory\n",old->stack_size * (int)sizeof(int));
 845       free(iter);
 846       return NULL;
 847     }
 848     memcpy(iter->status_stack,old->status_stack,iter->stack_size*sizeof(int));
 849   }
 850   iter->config = NULL;
 851
 852   return iter;
 853 }
 854
 855 // HIGH Level API, by Fabian Franz (mplayer@fabian-franz.de)
 856 //
 857 play_tree_iter_t* pt_iter_create(play_tree_t** ppt, m_config_t* config)
 858 {
 859   play_tree_iter_t* r=NULL;
 860 #ifdef MP_DEBUG
 861   assert(*ppt!=NULL);
 862 #endif
 863
 864   *ppt=play_tree_cleanup(*ppt);
 865
 866   if(*ppt) {
 867     r = play_tree_iter_new(*ppt,config);
 868     if (r && play_tree_iter_step(r,0,0) != PLAY_TREE_ITER_ENTRY)
 869     {
 870       play_tree_iter_free(r);
 871       r = NULL;
 872     }
 873   }
 874
 875   return r;
 876 }
 877
 878 void pt_iter_destroy(play_tree_iter_t** iter)
 879 {
 880   if (iter && *iter)
 881   {
 882     free(*iter);
 883     iter=NULL;
 884   }
 885 }
 886
 887 char* pt_iter_get_file(play_tree_iter_t* iter, int d)
 888 {
 889   int i=0;
 890   char* r;
 891
 892   if (iter==NULL)
 893     return NULL;
 894
 895   r = play_tree_iter_get_file(iter,d);
 896
 897   while (!r && d!=0)
 898   {
 899     if (play_tree_iter_step(iter,d,0) != PLAY_TREE_ITER_ENTRY)
 900         break;
 901     r=play_tree_iter_get_file(iter,d);
 902     i++;
 903   }
 904
 905   return r;
 906 }
 907
 908 void pt_iter_insert_entry(play_tree_iter_t* iter, play_tree_t* entry)
 909 {
 910   play_tree_t *pt = iter->tree;
 911 #ifdef MP_DEBUG
 912   assert(pt!=NULL);
 913   assert(entry!=NULL);
 914   assert(entry!=pt);
 915 #endif
 916
 917   play_tree_insert_entry(pt, entry);
 918   play_tree_set_params_from(entry,pt);
 919 }
 920
 921 void pt_iter_replace_entry(play_tree_iter_t* iter, play_tree_t* entry)
 922 {
 923   play_tree_t *pt = iter->tree;
 924
 925   pt_iter_insert_entry(iter, entry);
 926   play_tree_remove(pt, 1, 1);
 927   iter->tree=entry;
 928 }
 929
 930 //Add a new file as a new entry
 931 void pt_add_file(play_tree_t** ppt, char* filename)
 932 {
 933   play_tree_t *pt = *ppt, *entry = play_tree_new();
 934 #ifdef MP_DEBUG
 935   assert(entry!=NULL);
 936 #endif
 937
 938   play_tree_add_file(entry, filename);
 939   if (pt)
 940     play_tree_append_entry(pt, entry);
 941   else
 942   {
 943     pt=entry;
 944     *ppt=pt;
 945   }
 946   play_tree_set_params_from(entry,pt);
 947 }
 948
 949 void pt_iter_goto_head(play_tree_iter_t* iter)
 950 {
 951   iter->tree=iter->root;
 952   play_tree_iter_step(iter, 0, 0);
 953 }