git.sesse.net Git - mlt/blob - src/framework/mlt_playlist.c

   1 /*
   2  * mlt_playlist.c -- playlist service class
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "config.h"
  22
  23 #include "mlt_playlist.h"
  24 #include "mlt_frame.h"
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 /** Virtual playlist entry.
  31 */
  32
  33 typedef struct
  34 {
  35         mlt_producer producer;
  36         mlt_position frame_in;
  37         mlt_position frame_out;
  38         mlt_position frame_count;
  39         mlt_event event;
  40 }
  41 playlist_entry;
  42
  43 /** Private definition.
  44 */
  45
  46 struct mlt_playlist_s
  47 {
  48         struct mlt_producer_s parent;
  49         struct mlt_producer_s blank;
  50
  51         int size;
  52         int count;
  53         playlist_entry **list;
  54 };
  55
  56 /** Forward declarations
  57 */
  58
  59 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  60
  61 /** Constructor.
  62 */
  63
  64 mlt_playlist mlt_playlist_init( )
  65 {
  66         mlt_playlist this = calloc( sizeof( struct mlt_playlist_s ), 1 );
  67         if ( this != NULL )
  68         {
  69                 mlt_producer producer = &this->parent;
  70
  71                 // Construct the producer
  72                 mlt_producer_init( producer, this );
  73
  74                 // Override the producer get_frame
  75                 producer->get_frame = producer_get_frame;
  76
  77                 // Define the destructor
  78                 producer->close = ( mlt_destructor )mlt_playlist_close;
  79                 producer->close_object = this;
  80
  81                 // Initialise blank
  82                 mlt_producer_init( &this->blank, NULL );
  83                 mlt_properties_set( mlt_producer_properties( &this->blank ), "mlt_service", "blank" );
  84                 mlt_properties_set( mlt_producer_properties( &this->blank ), "resource", "blank" );
  85
  86                 // Indicate that this producer is a playlist
  87                 mlt_properties_set_data( mlt_playlist_properties( this ), "playlist", this, 0, NULL, NULL );
  88
  89                 // Specify the eof condition
  90                 mlt_properties_set( mlt_playlist_properties( this ), "eof", "pause" );
  91                 mlt_properties_set( mlt_playlist_properties( this ), "resource", "<playlist>" );
  92                 mlt_properties_set( mlt_playlist_properties( this ), "mlt_type", "mlt_producer" );
  93                 mlt_properties_set_position( mlt_playlist_properties( this ), "in", 0 );
  94                 mlt_properties_set_position( mlt_playlist_properties( this ), "out", 0 );
  95                 mlt_properties_set_position( mlt_playlist_properties( this ), "length", 0 );
  96
  97                 this->size = 10;
  98                 this->list = malloc( this->size * sizeof( playlist_entry * ) );
  99         }
 100
 101         return this;
 102 }
 103
 104 /** Get the producer associated to this playlist.
 105 */
 106
 107 mlt_producer mlt_playlist_producer( mlt_playlist this )
 108 {
 109         return this != NULL ? &this->parent : NULL;
 110 }
 111
 112 /** Get the service associated to this playlist.
 113 */
 114
 115 mlt_service mlt_playlist_service( mlt_playlist this )
 116 {
 117         return mlt_producer_service( &this->parent );
 118 }
 119
 120 /** Get the propertues associated to this playlist.
 121 */
 122
 123 mlt_properties mlt_playlist_properties( mlt_playlist this )
 124 {
 125         return mlt_producer_properties( &this->parent );
 126 }
 127
 128 /** Refresh the playlist after a clip has been changed.
 129 */
 130
 131 static int mlt_playlist_virtual_refresh( mlt_playlist this )
 132 {
 133         // Obtain the properties
 134         mlt_properties properties = mlt_playlist_properties( this );
 135
 136         // Get the fps of the first producer
 137         double fps = mlt_properties_get_double( properties, "first_fps" );
 138         int i = 0;
 139         mlt_position frame_count = 0;
 140
 141         for ( i = 0; i < this->count; i ++ )
 142         {
 143                 // Get the producer
 144                 mlt_producer producer = this->list[ i ]->producer;
 145
 146                 // If fps is 0
 147                 if ( fps == 0 )
 148                 {
 149                         // Inherit it from the producer
 150                         fps = mlt_producer_get_fps( producer );
 151                 }
 152                 else if ( fps != mlt_properties_get_double( mlt_producer_properties( producer ), "fps" ) )
 153                 {
 154                         // Generate a warning for now - the following attempt to fix may fail
 155                         fprintf( stderr, "Warning: fps mismatch on playlist producer %d\n", this->count );
 156
 157                         // It should be safe to impose fps on an image producer, but not necessarily safe for video
 158                         mlt_properties_set_double( mlt_producer_properties( producer ), "fps", fps );
 159                 }
 160
 161                 // Update the frame_count for this clip
 162                 frame_count += this->list[ i ]->frame_count;
 163         }
 164
 165         // Refresh all properties
 166         mlt_properties_set_double( properties, "first_fps", fps );
 167         mlt_properties_set_double( properties, "fps", fps == 0 ? 25 : fps );
 168         mlt_events_block( properties, properties );
 169         mlt_properties_set_position( properties, "length", frame_count );
 170         mlt_events_unblock( properties, properties );
 171         mlt_properties_set_position( properties, "out", frame_count - 1 );
 172
 173         return 0;
 174 }
 175
 176 /** Listener for producers on the playlist.
 177 */
 178
 179 static void mlt_playlist_listener( mlt_producer producer, mlt_playlist this )
 180 {
 181         mlt_playlist_virtual_refresh( this );
 182 }
 183
 184 /** Append to the virtual playlist.
 185 */
 186
 187 static int mlt_playlist_virtual_append( mlt_playlist this, mlt_producer producer, mlt_position in, mlt_position out )
 188 {
 189         mlt_properties properties = mlt_producer_properties( producer );
 190
 191         // Check that we have room
 192         if ( this->count >= this->size )
 193         {
 194                 int i;
 195                 this->list = realloc( this->list, ( this->size + 10 ) * sizeof( playlist_entry * ) );
 196                 for ( i = this->size; i < this->size + 10; i ++ ) this->list[ i ] = NULL;
 197                 this->size += 10;
 198         }
 199
 200         this->list[ this->count ] = calloc( sizeof( playlist_entry ), 1 );
 201         this->list[ this->count ]->producer = producer;
 202         this->list[ this->count ]->frame_in = in;
 203         this->list[ this->count ]->frame_out = out;
 204         this->list[ this->count ]->frame_count = out - in + 1;
 205         this->list[ this->count ]->event = mlt_events_listen( properties, this, "producer-changed", ( mlt_listener )mlt_playlist_listener );
 206         mlt_event_inc_ref( this->list[ this->count ]->event );
 207
 208         mlt_properties_set( properties, "eof", "pause" );
 209
 210         mlt_producer_set_speed( producer, 0 );
 211
 212         this->count ++;
 213
 214         mlt_properties_inc_ref( properties );
 215
 216         return mlt_playlist_virtual_refresh( this );
 217 }
 218
 219 /** Seek in the virtual playlist.
 220 */
 221
 222 static mlt_service mlt_playlist_virtual_seek( mlt_playlist this )
 223 {
 224         // Default producer to blank
 225         mlt_producer producer = NULL;
 226
 227         // Map playlist position to real producer in virtual playlist
 228         mlt_position position = mlt_producer_frame( &this->parent );
 229
 230         mlt_position original = position;
 231
 232         // Total number of frames
 233         int64_t total = 0;
 234
 235         // Get the properties
 236         mlt_properties properties = mlt_playlist_properties( this );
 237
 238         // Get the eof handling
 239         char *eof = mlt_properties_get( properties, "eof" );
 240
 241         // Index for the main loop
 242         int i = 0;
 243
 244         // Loop for each producer until found
 245         for ( i = 0; i < this->count; i ++ )
 246         {
 247                 // Increment the total
 248                 total += this->list[ i ]->frame_count;
 249
 250                 // Check if the position indicates that we have found the clip
 251                 if ( position < this->list[ i ]->frame_count )
 252                 {
 253                         // Found it, now break
 254                         producer = this->list[ i ]->producer;
 255                         break;
 256                 }
 257                 else
 258                 {
 259                         // Decrement position by length of this entry
 260                         position -= this->list[ i ]->frame_count;
 261                 }
 262         }
 263
 264         // Seek in real producer to relative position
 265         if ( producer != NULL )
 266         {
 267                 position += this->list[ i ]->frame_in;
 268                 mlt_producer_seek( producer, position );
 269         }
 270         else if ( !strcmp( eof, "pause" ) && total > 0 )
 271         {
 272                 playlist_entry *entry = this->list[ this->count - 1 ];
 273                 mlt_producer this_producer = mlt_playlist_producer( this );
 274                 mlt_producer_seek( this_producer, original - 1 );
 275                 producer = entry->producer;
 276                 mlt_producer_seek( producer, entry->frame_out );
 277                 mlt_producer_set_speed( this_producer, 0 );
 278                 mlt_producer_set_speed( producer, 0 );
 279         }
 280         else if ( !strcmp( eof, "loop" ) && total > 0 )
 281         {
 282                 playlist_entry *entry = this->list[ 0 ];
 283                 mlt_producer this_producer = mlt_playlist_producer( this );
 284                 mlt_producer_seek( this_producer, 0 );
 285                 producer = entry->producer;
 286                 mlt_producer_seek( producer, entry->frame_in );
 287         }
 288         else
 289         {
 290                 producer = &this->blank;
 291         }
 292
 293         return mlt_producer_service( producer );
 294 }
 295
 296 /** Invoked when a producer indicates that it has prematurely reached its end.
 297 */
 298
 299 static mlt_producer mlt_playlist_virtual_set_out( mlt_playlist this )
 300 {
 301         // Default producer to blank
 302         mlt_producer producer = &this->blank;
 303
 304         // Map playlist position to real producer in virtual playlist
 305         mlt_position position = mlt_producer_frame( &this->parent );
 306
 307         // Loop through the virtual playlist
 308         int i = 0;
 309
 310         for ( i = 0; i < this->count; i ++ )
 311         {
 312                 if ( position < this->list[ i ]->frame_count )
 313                 {
 314                         // Found it, now break
 315                         producer = this->list[ i ]->producer;
 316                         break;
 317                 }
 318                 else
 319                 {
 320                         // Decrement position by length of this entry
 321                         position -= this->list[ i ]->frame_count;
 322                 }
 323         }
 324
 325         // Seek in real producer to relative position
 326         if ( i < this->count && this->list[ i ]->frame_out != position )
 327         {
 328                 // Update the frame_count for the changed clip (hmmm)
 329                 this->list[ i ]->frame_out = position;
 330                 this->list[ i ]->frame_count = this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1;
 331
 332                 // Refresh the playlist
 333                 mlt_playlist_virtual_refresh( this );
 334         }
 335
 336         return producer;
 337 }
 338
 339 /** Obtain the current clips index.
 340 */
 341
 342 int mlt_playlist_current_clip( mlt_playlist this )
 343 {
 344         // Map playlist position to real producer in virtual playlist
 345         mlt_position position = mlt_producer_frame( &this->parent );
 346
 347         // Loop through the virtual playlist
 348         int i = 0;
 349
 350         for ( i = 0; i < this->count; i ++ )
 351         {
 352                 if ( position < this->list[ i ]->frame_count )
 353                 {
 354                         // Found it, now break
 355                         break;
 356                 }
 357                 else
 358                 {
 359                         // Decrement position by length of this entry
 360                         position -= this->list[ i ]->frame_count;
 361                 }
 362         }
 363
 364         return i;
 365 }
 366
 367 /** Obtain the current clips producer.
 368 */
 369
 370 mlt_producer mlt_playlist_current( mlt_playlist this )
 371 {
 372         int i = mlt_playlist_current_clip( this );
 373         if ( i < this->count )
 374                 return this->list[ i ]->producer;
 375         else
 376                 return &this->blank;
 377 }
 378
 379 /** Get the position which corresponds to the start of the next clip.
 380 */
 381
 382 mlt_position mlt_playlist_clip( mlt_playlist this, mlt_whence whence, int index )
 383 {
 384         mlt_position position = 0;
 385         int absolute_clip = index;
 386         int i = 0;
 387
 388         // Determine the absolute clip
 389         switch ( whence )
 390         {
 391                 case mlt_whence_relative_start:
 392                         absolute_clip = index;
 393                         break;
 394
 395                 case mlt_whence_relative_current:
 396                         absolute_clip = mlt_playlist_current_clip( this ) + index;
 397                         break;
 398
 399                 case mlt_whence_relative_end:
 400                         absolute_clip = this->count - index;
 401                         break;
 402         }
 403
 404         // Check that we're in a valid range
 405         if ( absolute_clip < 0 )
 406                 absolute_clip = 0;
 407         else if ( absolute_clip > this->count )
 408                 absolute_clip = this->count;
 409
 410         // Now determine the position
 411         for ( i = 0; i < absolute_clip; i ++ )
 412                 position += this->list[ i ]->frame_count;
 413
 414         return position;
 415 }
 416
 417 /** Get all the info about the clip specified.
 418 */
 419
 420 int mlt_playlist_get_clip_info( mlt_playlist this, mlt_playlist_clip_info *info, int index )
 421 {
 422         int error = index < 0 || index >= this->count;
 423         memset( info, 0, sizeof( mlt_playlist_clip_info ) );
 424         if ( !error )
 425         {
 426                 mlt_producer producer = this->list[ index ]->producer;
 427                 mlt_properties properties = mlt_producer_properties( producer );
 428                 info->clip = index;
 429                 info->producer = producer;
 430                 info->start = mlt_playlist_clip( this, mlt_whence_relative_start, index );
 431                 info->resource = mlt_properties_get( properties, "resource" );
 432                 info->frame_in = this->list[ index ]->frame_in;
 433                 info->frame_out = this->list[ index ]->frame_out;
 434                 info->frame_count = this->list[ index ]->frame_count;
 435                 info->length = mlt_producer_get_length( producer );
 436                 info->fps = mlt_producer_get_fps( producer );
 437                 info->event = this->list[ index ]->event;
 438         }
 439
 440         // Determine the consuming filter service
 441         if ( info->producer != NULL )
 442         {
 443                 info->service = mlt_producer_service( info->producer );
 444                 while ( mlt_service_consumer( info->service ) != NULL )
 445                         info->service = mlt_service_consumer( info->service );
 446         }
 447
 448         return error;
 449 }
 450
 451 /** Get number of clips in the playlist.
 452 */
 453
 454 int mlt_playlist_count( mlt_playlist this )
 455 {
 456         return this->count;
 457 }
 458
 459 /** Clear the playlist.
 460 */
 461
 462 int mlt_playlist_clear( mlt_playlist this )
 463 {
 464         int i;
 465         for ( i = 0; i < this->count; i ++ )
 466         {
 467                 mlt_event_close( this->list[ i ]->event );
 468                 mlt_producer_close( this->list[ i ]->producer );
 469         }
 470         this->count = 0;
 471         mlt_properties_set_double( mlt_playlist_properties( this ), "first_fps", 0 );
 472         return mlt_playlist_virtual_refresh( this );
 473 }
 474
 475 /** Append a producer to the playlist.
 476 */
 477
 478 int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
 479 {
 480         // Append to virtual list
 481         return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) - 1 );
 482 }
 483
 484 /** Append a producer to the playlist with in/out points.
 485 */
 486
 487 int mlt_playlist_append_io( mlt_playlist this, mlt_producer producer, mlt_position in, mlt_position out )
 488 {
 489         // Append to virtual list
 490         if ( in != -1 && out != -1 )
 491                 return mlt_playlist_virtual_append( this, producer, in, out );
 492         else
 493                 return mlt_playlist_append( this, producer );
 494 }
 495
 496 /** Append a blank to the playlist of a given length.
 497 */
 498
 499 int mlt_playlist_blank( mlt_playlist this, mlt_position length )
 500 {
 501         // Append to the virtual list
 502         return mlt_playlist_virtual_append( this, &this->blank, 0, length );
 503 }
 504
 505 /** Insert a producer into the playlist.
 506 */
 507
 508 int mlt_playlist_insert( mlt_playlist this, mlt_producer producer, int where, mlt_position in, mlt_position out )
 509 {
 510         // Append to end
 511         mlt_events_block( mlt_playlist_properties( this ), this );
 512         mlt_playlist_append_io( this, producer, in, out );
 513
 514         // Move to the position specified
 515         mlt_playlist_move( this, this->count - 1, where );
 516         mlt_events_unblock( mlt_playlist_properties( this ), this );
 517
 518         return mlt_playlist_virtual_refresh( this );
 519 }
 520
 521 /** Remove an entry in the playlist.
 522 */
 523
 524 int mlt_playlist_remove( mlt_playlist this, int where )
 525 {
 526         if ( this->count > 0 )
 527         {
 528                 // We need to know the current clip and the position within the playlist
 529                 int current = mlt_playlist_current_clip( this );
 530                 mlt_position position = mlt_producer_position( mlt_playlist_producer( this ) );
 531
 532                 // We need all the details about the clip we're removing
 533                 mlt_playlist_clip_info where_info;
 534
 535                 // Loop variable
 536                 int i = 0;
 537
 538                 // Make sure the clip to be removed is valid and correct if necessary
 539                 if ( where < 0 )
 540                         where = 0;
 541                 if ( where >= this->count )
 542                         where = this->count - 1;
 543
 544                 // Get the clip info of the clip to be removed
 545                 mlt_playlist_get_clip_info( this, &where_info, where );
 546
 547                 // Close the producer associated to the clip info
 548                 mlt_event_close( where_info.event );
 549                 mlt_producer_close( where_info.producer );
 550
 551                 // Reorganise the list
 552                 for ( i = where + 1; i < this->count; i ++ )
 553                         this->list[ i - 1 ] = this->list[ i ];
 554                 this->count --;
 555
 556                 // Correct position
 557                 if ( where == current )
 558                         mlt_producer_seek( mlt_playlist_producer( this ), where_info.start );
 559                 else if ( where < current && this->count > 0 )
 560                         mlt_producer_seek( mlt_playlist_producer( this ), position - where_info.frame_count );
 561                 else if ( this->count == 0 )
 562                         mlt_producer_seek( mlt_playlist_producer( this ), 0 );
 563
 564                 // Refresh the playlist
 565                 mlt_playlist_virtual_refresh( this );
 566         }
 567
 568         return 0;
 569 }
 570
 571 /** Move an entry in the playlist.
 572 */
 573
 574 int mlt_playlist_move( mlt_playlist this, int src, int dest )
 575 {
 576         int i;
 577
 578         /* We need to ensure that the requested indexes are valid and correct it as necessary */
 579         if ( src < 0 )
 580                 src = 0;
 581         if ( src >= this->count )
 582                 src = this->count - 1;
 583
 584         if ( dest < 0 )
 585                 dest = 0;
 586         if ( dest >= this->count )
 587                 dest = this->count - 1;
 588
 589         if ( src != dest && this->count > 1 )
 590         {
 591                 int current = mlt_playlist_current_clip( this );
 592                 mlt_position position = mlt_producer_position( mlt_playlist_producer( this ) );
 593                 playlist_entry *src_entry = NULL;
 594
 595                 // We need all the details about the current clip
 596                 mlt_playlist_clip_info current_info;
 597
 598                 mlt_playlist_get_clip_info( this, &current_info, current );
 599                 position -= current_info.start;
 600
 601                 if ( current == src )
 602                         current = dest;
 603                 else if ( current > src && current < dest )
 604                         current ++;
 605                 else if ( current == dest )
 606                         current = src;
 607
 608                 src_entry = this->list[ src ];
 609                 if ( src > dest )
 610                 {
 611                         for ( i = src; i > dest; i -- )
 612                                 this->list[ i ] = this->list[ i - 1 ];
 613                 }
 614                 else
 615                 {
 616                         for ( i = src; i < dest; i ++ )
 617                                 this->list[ i ] = this->list[ i + 1 ];
 618                 }
 619                 this->list[ dest ] = src_entry;
 620
 621                 mlt_playlist_get_clip_info( this, &current_info, current );
 622                 mlt_producer_seek( mlt_playlist_producer( this ), current_info.start + position );
 623                 mlt_playlist_virtual_refresh( this );
 624         }
 625
 626         return 0;
 627 }
 628
 629 /** Resize the current clip.
 630 */
 631
 632 int mlt_playlist_resize_clip( mlt_playlist this, int clip, mlt_position in, mlt_position out )
 633 {
 634         int error = clip < 0 || clip >= this->count;
 635         if ( error == 0 )
 636         {
 637                 playlist_entry *entry = this->list[ clip ];
 638                 mlt_producer producer = entry->producer;
 639
 640                 if ( in <= -1 )
 641                         in = 0;
 642                 if ( out <= -1 || out >= mlt_producer_get_playtime( producer ) )
 643                         out = mlt_producer_get_playtime( producer ) - 1;
 644
 645                 if ( out < in )
 646                 {
 647                         mlt_position t = in;
 648                         in = out;
 649                         out = t;
 650                 }
 651
 652                 entry->frame_in = in;
 653                 entry->frame_out = out;
 654                 entry->frame_count = out - in + 1;
 655                 mlt_playlist_virtual_refresh( this );
 656         }
 657         return error;
 658 }
 659
 660 /** Split a clip on the playlist at the given position.
 661 */
 662
 663 int mlt_playlist_split( mlt_playlist this, int clip, mlt_position position )
 664 {
 665         int error = clip < 0 || clip >= this->count;
 666         if ( error == 0 )
 667         {
 668                 playlist_entry *entry = this->list[ clip ];
 669                 if ( position > 0 && position < entry->frame_count )
 670                 {
 671                         int in = entry->frame_in;
 672                         int out = entry->frame_out;
 673                         mlt_events_block( mlt_playlist_properties( this ), this );
 674                         mlt_playlist_resize_clip( this, clip, in, in + position );
 675                         mlt_events_unblock( mlt_playlist_properties( this ), this );
 676                         mlt_playlist_insert( this, entry->producer, clip + 1, in + position + 1, out );
 677                 }
 678                 else
 679                 {
 680                         error = 1;
 681                 }
 682         }
 683         return error;
 684 }
 685
 686 /** Join 1 or more consecutive clips.
 687 */
 688
 689 int mlt_playlist_join( mlt_playlist this, int clip, int count, int merge )
 690 {
 691         int error = clip < 0 || ( clip + 1 ) >= this->count;
 692         if ( error == 0 )
 693         {
 694                 int i = clip;
 695                 mlt_playlist new_clip = mlt_playlist_init( );
 696                 mlt_events_block( mlt_playlist_properties( this ), this );
 697                 if ( clip + count >= this->count )
 698                         count = this->count - clip;
 699                 for ( i = 0; i <= count; i ++ )
 700                 {
 701                         playlist_entry *entry = this->list[ clip ];
 702                         mlt_playlist_append_io( new_clip, entry->producer, entry->frame_in, entry->frame_out );
 703                         mlt_playlist_remove( this, clip );
 704                 }
 705                 mlt_events_unblock( mlt_playlist_properties( this ), this );
 706                 mlt_playlist_insert( this, mlt_playlist_producer( new_clip ), clip, 0, -1 );
 707                 mlt_playlist_close( new_clip );
 708         }
 709         return error;
 710 }
 711
 712 /** Get the current frame.
 713 */
 714
 715 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 716 {
 717         // Get this mlt_playlist
 718         mlt_playlist this = producer->child;
 719
 720         // Get the real producer
 721         mlt_service real = mlt_playlist_virtual_seek( this );
 722
 723         // Get the frame
 724         mlt_service_get_frame( real, frame, index );
 725
 726         // Check if we're at the end of the clip
 727         mlt_properties properties = mlt_frame_properties( *frame );
 728         if ( mlt_properties_get_int( properties, "end_of_clip" ) )
 729                 mlt_playlist_virtual_set_out( this );
 730
 731         // Check for notifier and call with appropriate argument
 732         mlt_properties playlist_properties = mlt_producer_properties( producer );
 733         void ( *notifier )( void * ) = mlt_properties_get_data( playlist_properties, "notifier", NULL );
 734         if ( notifier != NULL )
 735         {
 736                 void *argument = mlt_properties_get_data( playlist_properties, "notifier_arg", NULL );
 737                 notifier( argument );
 738         }
 739
 740         // Update position on the frame we're creating
 741         mlt_frame_set_position( *frame, mlt_producer_frame( producer ) );
 742
 743         // Position ourselves on the next frame
 744         mlt_producer_prepare_next( producer );
 745
 746         return 0;
 747 }
 748
 749 /** Close the playlist.
 750 */
 751
 752 void mlt_playlist_close( mlt_playlist this )
 753 {
 754         if ( this != NULL && mlt_properties_dec_ref( mlt_playlist_properties( this ) ) <= 0 )
 755         {
 756                 int i = 0;
 757                 this->parent.close = NULL;
 758                 for ( i = 0; i < this->count; i ++ )
 759                 {
 760                         mlt_event_close( this->list[ i ]->event );
 761                         mlt_producer_close( this->list[ i ]->producer );
 762                         free( this->list[ i ] );
 763                 }
 764                 mlt_producer_close( &this->blank );
 765                 mlt_producer_close( &this->parent );
 766                 free( this->list );
 767                 free( this );
 768         }
 769 }