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