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 library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "mlt_playlist.h"
  22 #include "mlt_tractor.h"
  23 #include "mlt_multitrack.h"
  24 #include "mlt_field.h"
  25 #include "mlt_frame.h"
  26 #include "mlt_transition.h"
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 /** Virtual playlist entry.
  33 */
  34
  35 struct playlist_entry_s
  36 {
  37         mlt_producer producer;
  38         mlt_position frame_in;
  39         mlt_position frame_out;
  40         mlt_position frame_count;
  41         int repeat;
  42         mlt_position producer_length;
  43         mlt_event event;
  44         int preservation_hack;
  45 };
  46
  47 /** Forward declarations
  48 */
  49
  50 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  51 static int mlt_playlist_unmix( mlt_playlist this, int clip );
  52 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out );
  53
  54 /** Constructor.
  55 */
  56
  57 mlt_playlist mlt_playlist_init( )
  58 {
  59         mlt_playlist this = calloc( sizeof( struct mlt_playlist_s ), 1 );
  60         if ( this != NULL )
  61         {
  62                 mlt_producer producer = &this->parent;
  63
  64                 // Construct the producer
  65                 mlt_producer_init( producer, this );
  66
  67                 // Override the producer get_frame
  68                 producer->get_frame = producer_get_frame;
  69
  70                 // Define the destructor
  71                 producer->close = ( mlt_destructor )mlt_playlist_close;
  72                 producer->close_object = this;
  73
  74                 // Initialise blank
  75                 mlt_producer_init( &this->blank, NULL );
  76                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( &this->blank ), "mlt_service", "blank" );
  77                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( &this->blank ), "resource", "blank" );
  78
  79                 // Indicate that this producer is a playlist
  80                 mlt_properties_set_data( MLT_PLAYLIST_PROPERTIES( this ), "playlist", this, 0, NULL, NULL );
  81
  82                 // Specify the eof condition
  83                 mlt_properties_set( MLT_PLAYLIST_PROPERTIES( this ), "eof", "pause" );
  84                 mlt_properties_set( MLT_PLAYLIST_PROPERTIES( this ), "resource", "<playlist>" );
  85                 mlt_properties_set( MLT_PLAYLIST_PROPERTIES( this ), "mlt_type", "mlt_producer" );
  86                 mlt_properties_set_position( MLT_PLAYLIST_PROPERTIES( this ), "in", 0 );
  87                 mlt_properties_set_position( MLT_PLAYLIST_PROPERTIES( this ), "out", -1 );
  88                 mlt_properties_set_position( MLT_PLAYLIST_PROPERTIES( this ), "length", 0 );
  89
  90                 this->size = 10;
  91                 this->list = malloc( this->size * sizeof( playlist_entry * ) );
  92         }
  93
  94         return this;
  95 }
  96
  97 /** Get the producer associated to this playlist.
  98 */
  99
 100 mlt_producer mlt_playlist_producer( mlt_playlist this )
 101 {
 102         return this != NULL ? &this->parent : NULL;
 103 }
 104
 105 /** Get the service associated to this playlist.
 106 */
 107
 108 mlt_service mlt_playlist_service( mlt_playlist this )
 109 {
 110         return MLT_PRODUCER_SERVICE( &this->parent );
 111 }
 112
 113 /** Get the propertues associated to this playlist.
 114 */
 115
 116 mlt_properties mlt_playlist_properties( mlt_playlist this )
 117 {
 118         return MLT_PRODUCER_PROPERTIES( &this->parent );
 119 }
 120
 121 /** Refresh the playlist after a clip has been changed.
 122 */
 123
 124 static int mlt_playlist_virtual_refresh( mlt_playlist this )
 125 {
 126         // Obtain the properties
 127         mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
 128         int i = 0;
 129         mlt_position frame_count = 0;
 130
 131         for ( i = 0; i < this->count; i ++ )
 132         {
 133                 // Get the producer
 134                 mlt_producer producer = this->list[ i ]->producer;
 135                 int current_length = mlt_producer_get_out( producer ) - mlt_producer_get_in( producer ) + 1;
 136
 137                 // Check if the length of the producer has changed
 138                 if ( this->list[ i ]->frame_in != mlt_producer_get_in( producer ) ||
 139                          this->list[ i ]->frame_out != mlt_producer_get_out( producer ) )
 140                 {
 141                         // This clip should be removed...
 142                         if ( current_length < 1 )
 143                         {
 144                                 this->list[ i ]->frame_in = 0;
 145                                 this->list[ i ]->frame_out = -1;
 146                                 this->list[ i ]->frame_count = 0;
 147                         }
 148                         else
 149                         {
 150                                 this->list[ i ]->frame_in = mlt_producer_get_in( producer );
 151                                 this->list[ i ]->frame_out = mlt_producer_get_out( producer );
 152                                 this->list[ i ]->frame_count = current_length;
 153                         }
 154
 155                         // Update the producer_length
 156                         this->list[ i ]->producer_length = current_length;
 157                 }
 158
 159                 // Calculate the frame_count
 160                 this->list[ i ]->frame_count = ( this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1 ) * this->list[ i ]->repeat;
 161
 162                 // Update the frame_count for this clip
 163                 frame_count += this->list[ i ]->frame_count;
 164         }
 165
 166         // Refresh all properties
 167         mlt_events_block( properties, properties );
 168         mlt_properties_set_position( properties, "length", frame_count );
 169         mlt_events_unblock( properties, properties );
 170         mlt_properties_set_position( properties, "out", frame_count - 1 );
 171
 172         return 0;
 173 }
 174
 175 /** Listener for producers on the playlist.
 176 */
 177
 178 static void mlt_playlist_listener( mlt_producer producer, mlt_playlist this )
 179 {
 180         mlt_playlist_virtual_refresh( this );
 181 }
 182
 183 /** Append to the virtual playlist.
 184 */
 185
 186 static int mlt_playlist_virtual_append( mlt_playlist this, mlt_producer source, mlt_position in, mlt_position out )
 187 {
 188         mlt_producer producer = NULL;
 189         mlt_properties properties = NULL;
 190         mlt_properties parent = NULL;
 191
 192         // If we have a cut, then use the in/out points from the cut
 193         if ( mlt_producer_is_blank( source )  )
 194         {
 195                 // Make sure the blank is long enough to accomodate the length specified
 196                 if ( out - in + 1 > mlt_producer_get_length( &this->blank ) )
 197                 {
 198                         mlt_properties blank_props = MLT_PRODUCER_PROPERTIES( &this->blank );
 199                         mlt_events_block( blank_props, blank_props );
 200                         mlt_producer_set_in_and_out( &this->blank, in, out );
 201                         mlt_events_unblock( blank_props, blank_props );
 202                 }
 203
 204                 // Now make sure the cut comes from this this->blank
 205                 if ( source == NULL )
 206                 {
 207                         producer = mlt_producer_cut( &this->blank, in, out );
 208                 }
 209                 else if ( !mlt_producer_is_cut( source ) || mlt_producer_cut_parent( source ) != &this->blank )
 210                 {
 211                         producer = mlt_producer_cut( &this->blank, in, out );
 212                 }
 213                 else
 214                 {
 215                         producer = source;
 216                         mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
 217                 }
 218
 219                 properties = MLT_PRODUCER_PROPERTIES( producer );
 220         }
 221         else if ( mlt_producer_is_cut( source ) )
 222         {
 223                 producer = source;
 224                 if ( in == -1 )
 225                         in = mlt_producer_get_in( producer );
 226                 if ( out == -1 || out > mlt_producer_get_out( producer ) )
 227                         out = mlt_producer_get_out( producer );
 228                 properties = MLT_PRODUCER_PROPERTIES( producer );
 229                 mlt_properties_inc_ref( properties );
 230         }
 231         else
 232         {
 233                 producer = mlt_producer_cut( source, in, out );
 234                 if ( in == -1 || in < mlt_producer_get_in( producer ) )
 235                         in = mlt_producer_get_in( producer );
 236                 if ( out == -1 || out > mlt_producer_get_out( producer ) )
 237                         out = mlt_producer_get_out( producer );
 238                 properties = MLT_PRODUCER_PROPERTIES( producer );
 239         }
 240
 241         // Fetch the cuts parent properties
 242         parent = MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( producer ) );
 243
 244         // Remove fezzik normalisers for fx cuts
 245         if ( mlt_properties_get_int( parent, "meta.fx_cut" ) )
 246         {
 247                 mlt_service service = MLT_PRODUCER_SERVICE( mlt_producer_cut_parent( producer ) );
 248                 mlt_filter filter = mlt_service_filter( service, 0 );
 249                 while ( filter != NULL && mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "_fezzik" ) )
 250                 {
 251                         mlt_service_detach( service, filter );
 252                         filter = mlt_service_filter( service, 0 );
 253                 }
 254                 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( producer ), "meta.fx_cut", 1 );
 255         }
 256
 257         // Check that we have room
 258         if ( this->count >= this->size )
 259         {
 260                 int i;
 261                 this->list = realloc( this->list, ( this->size + 10 ) * sizeof( playlist_entry * ) );
 262                 for ( i = this->size; i < this->size + 10; i ++ ) this->list[ i ] = NULL;
 263                 this->size += 10;
 264         }
 265
 266         // Create the entry
 267         this->list[ this->count ] = calloc( sizeof( playlist_entry ), 1 );
 268         if ( this->list[ this->count ] != NULL )
 269         {
 270                 this->list[ this->count ]->producer = producer;
 271                 this->list[ this->count ]->frame_in = in;
 272                 this->list[ this->count ]->frame_out = out;
 273                 this->list[ this->count ]->frame_count = out - in + 1;
 274                 this->list[ this->count ]->repeat = 1;
 275                 this->list[ this->count ]->producer_length = mlt_producer_get_out( producer ) - mlt_producer_get_in( producer ) + 1;
 276                 this->list[ this->count ]->event = mlt_events_listen( parent, this, "producer-changed", ( mlt_listener )mlt_playlist_listener );
 277                 mlt_event_inc_ref( this->list[ this->count ]->event );
 278                 mlt_properties_set( properties, "eof", "pause" );
 279                 mlt_producer_set_speed( producer, 0 );
 280                 this->count ++;
 281         }
 282
 283         return mlt_playlist_virtual_refresh( this );
 284 }
 285
 286 static mlt_producer mlt_playlist_locate( mlt_playlist this, mlt_position *position, int *clip, int *total )
 287 {
 288         // Default producer to NULL
 289         mlt_producer producer = NULL;
 290
 291         // Loop for each producer until found
 292         for ( *clip = 0; *clip < this->count; *clip += 1 )
 293         {
 294                 // Increment the total
 295                 *total += this->list[ *clip ]->frame_count;
 296
 297                 // Check if the position indicates that we have found the clip
 298                 // Note that 0 length clips get skipped automatically
 299                 if ( *position < this->list[ *clip ]->frame_count )
 300                 {
 301                         // Found it, now break
 302                         producer = this->list[ *clip ]->producer;
 303                         break;
 304                 }
 305                 else
 306                 {
 307                         // Decrement position by length of this entry
 308                         *position -= this->list[ *clip ]->frame_count;
 309                 }
 310         }
 311
 312         return producer;
 313 }
 314
 315 /** Seek in the virtual playlist.
 316 */
 317
 318 static mlt_service mlt_playlist_virtual_seek( mlt_playlist this, int *progressive )
 319 {
 320         // Map playlist position to real producer in virtual playlist
 321         mlt_position position = mlt_producer_frame( &this->parent );
 322
 323         // Keep the original position since we change it while iterating through the list
 324         mlt_position original = position;
 325
 326         // Clip index and total
 327         int i = 0;
 328         int total = 0;
 329
 330         // Locate the producer for the position
 331         mlt_producer producer = mlt_playlist_locate( this, &position, &i, &total );
 332
 333         // Get the properties
 334         mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
 335
 336         // Get the eof handling
 337         char *eof = mlt_properties_get( properties, "eof" );
 338
 339         // Seek in real producer to relative position
 340         if ( producer != NULL )
 341         {
 342                 int count = this->list[ i ]->frame_count / this->list[ i ]->repeat;
 343                 *progressive = count == 1;
 344                 mlt_producer_seek( producer, (int)position % count );
 345         }
 346         else if ( !strcmp( eof, "pause" ) && total > 0 )
 347         {
 348                 playlist_entry *entry = this->list[ this->count - 1 ];
 349                 int count = entry->frame_count / entry->repeat;
 350                 mlt_producer this_producer = MLT_PLAYLIST_PRODUCER( this );
 351                 mlt_producer_seek( this_producer, original - 1 );
 352                 producer = entry->producer;
 353                 mlt_producer_seek( producer, (int)entry->frame_out % count );
 354                 mlt_producer_set_speed( this_producer, 0 );
 355                 mlt_producer_set_speed( producer, 0 );
 356                 *progressive = count == 1;
 357         }
 358         else if ( !strcmp( eof, "loop" ) && total > 0 )
 359         {
 360                 playlist_entry *entry = this->list[ 0 ];
 361                 mlt_producer this_producer = MLT_PLAYLIST_PRODUCER( this );
 362                 mlt_producer_seek( this_producer, 0 );
 363                 producer = entry->producer;
 364                 mlt_producer_seek( producer, 0 );
 365         }
 366         else
 367         {
 368                 producer = &this->blank;
 369         }
 370
 371         return MLT_PRODUCER_SERVICE( producer );
 372 }
 373
 374 /** Invoked when a producer indicates that it has prematurely reached its end.
 375 */
 376
 377 static mlt_producer mlt_playlist_virtual_set_out( mlt_playlist this )
 378 {
 379         // Default producer to blank
 380         mlt_producer producer = &this->blank;
 381
 382         // Map playlist position to real producer in virtual playlist
 383         mlt_position position = mlt_producer_frame( &this->parent );
 384
 385         // Loop through the virtual playlist
 386         int i = 0;
 387
 388         for ( i = 0; i < this->count; i ++ )
 389         {
 390                 if ( position < this->list[ i ]->frame_count )
 391                 {
 392                         // Found it, now break
 393                         producer = this->list[ i ]->producer;
 394                         break;
 395                 }
 396                 else
 397                 {
 398                         // Decrement position by length of this entry
 399                         position -= this->list[ i ]->frame_count;
 400                 }
 401         }
 402
 403         // Seek in real producer to relative position
 404         if ( i < this->count && this->list[ i ]->frame_out != position )
 405         {
 406                 // Update the frame_count for the changed clip (hmmm)
 407                 this->list[ i ]->frame_out = position;
 408                 this->list[ i ]->frame_count = this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1;
 409
 410                 // Refresh the playlist
 411                 mlt_playlist_virtual_refresh( this );
 412         }
 413
 414         return producer;
 415 }
 416
 417 /** Obtain the current clips index.
 418 */
 419
 420 int mlt_playlist_current_clip( mlt_playlist this )
 421 {
 422         // Map playlist position to real producer in virtual playlist
 423         mlt_position position = mlt_producer_frame( &this->parent );
 424
 425         // Loop through the virtual playlist
 426         int i = 0;
 427
 428         for ( i = 0; i < this->count; i ++ )
 429         {
 430                 if ( position < this->list[ i ]->frame_count )
 431                 {
 432                         // Found it, now break
 433                         break;
 434                 }
 435                 else
 436                 {
 437                         // Decrement position by length of this entry
 438                         position -= this->list[ i ]->frame_count;
 439                 }
 440         }
 441
 442         return i;
 443 }
 444
 445 /** Obtain the current clips producer.
 446 */
 447
 448 mlt_producer mlt_playlist_current( mlt_playlist this )
 449 {
 450         int i = mlt_playlist_current_clip( this );
 451         if ( i < this->count )
 452                 return this->list[ i ]->producer;
 453         else
 454                 return &this->blank;
 455 }
 456
 457 /** Get the position which corresponds to the start of the next clip.
 458 */
 459
 460 mlt_position mlt_playlist_clip( mlt_playlist this, mlt_whence whence, int index )
 461 {
 462         mlt_position position = 0;
 463         int absolute_clip = index;
 464         int i = 0;
 465
 466         // Determine the absolute clip
 467         switch ( whence )
 468         {
 469                 case mlt_whence_relative_start:
 470                         absolute_clip = index;
 471                         break;
 472
 473                 case mlt_whence_relative_current:
 474                         absolute_clip = mlt_playlist_current_clip( this ) + index;
 475                         break;
 476
 477                 case mlt_whence_relative_end:
 478                         absolute_clip = this->count - index;
 479                         break;
 480         }
 481
 482         // Check that we're in a valid range
 483         if ( absolute_clip < 0 )
 484                 absolute_clip = 0;
 485         else if ( absolute_clip > this->count )
 486                 absolute_clip = this->count;
 487
 488         // Now determine the position
 489         for ( i = 0; i < absolute_clip; i ++ )
 490                 position += this->list[ i ]->frame_count;
 491
 492         return position;
 493 }
 494
 495 /** Get all the info about the clip specified.
 496 */
 497
 498 int mlt_playlist_get_clip_info( mlt_playlist this, mlt_playlist_clip_info *info, int index )
 499 {
 500         int error = index < 0 || index >= this->count;
 501         memset( info, 0, sizeof( mlt_playlist_clip_info ) );
 502         if ( !error )
 503         {
 504                 mlt_producer producer = mlt_producer_cut_parent( this->list[ index ]->producer );
 505                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 506                 info->clip = index;
 507                 info->producer = producer;
 508                 info->cut = this->list[ index ]->producer;
 509                 info->start = mlt_playlist_clip( this, mlt_whence_relative_start, index );
 510                 info->resource = mlt_properties_get( properties, "resource" );
 511                 info->frame_in = this->list[ index ]->frame_in;
 512                 info->frame_out = this->list[ index ]->frame_out;
 513                 info->frame_count = this->list[ index ]->frame_count;
 514                 info->repeat = this->list[ index ]->repeat;
 515                 info->length = mlt_producer_get_length( producer );
 516                 info->fps = mlt_producer_get_fps( producer );
 517         }
 518
 519         return error;
 520 }
 521
 522 /** Get number of clips in the playlist.
 523 */
 524
 525 int mlt_playlist_count( mlt_playlist this )
 526 {
 527         return this->count;
 528 }
 529
 530 /** Clear the playlist.
 531 */
 532
 533 int mlt_playlist_clear( mlt_playlist this )
 534 {
 535         int i;
 536         for ( i = 0; i < this->count; i ++ )
 537         {
 538                 mlt_event_close( this->list[ i ]->event );
 539                 mlt_producer_close( this->list[ i ]->producer );
 540         }
 541         this->count = 0;
 542         return mlt_playlist_virtual_refresh( this );
 543 }
 544
 545 /** Append a producer to the playlist.
 546 */
 547
 548 int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
 549 {
 550         // Append to virtual list
 551         return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) - 1 );
 552 }
 553
 554 /** Append a producer to the playlist with in/out points.
 555 */
 556
 557 int mlt_playlist_append_io( mlt_playlist this, mlt_producer producer, mlt_position in, mlt_position out )
 558 {
 559         // Append to virtual list
 560         if ( in != -1 && out != -1 )
 561                 return mlt_playlist_virtual_append( this, producer, in, out );
 562         else
 563                 return mlt_playlist_append( this, producer );
 564 }
 565
 566 /** Append a blank to the playlist of a given length.
 567 */
 568
 569 int mlt_playlist_blank( mlt_playlist this, mlt_position length )
 570 {
 571         // Append to the virtual list
 572         return mlt_playlist_virtual_append( this, &this->blank, 0, length );
 573 }
 574
 575 /** Insert a producer into the playlist.
 576 */
 577
 578 int mlt_playlist_insert( mlt_playlist this, mlt_producer producer, int where, mlt_position in, mlt_position out )
 579 {
 580         // Append to end
 581         mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 582         mlt_playlist_append_io( this, producer, in, out );
 583
 584         // Move to the position specified
 585         mlt_playlist_move( this, this->count - 1, where );
 586         mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 587
 588         return mlt_playlist_virtual_refresh( this );
 589 }
 590
 591 /** Remove an entry in the playlist.
 592 */
 593
 594 int mlt_playlist_remove( mlt_playlist this, int where )
 595 {
 596         int error = where < 0 || where >= this->count;
 597         if ( error == 0 && mlt_playlist_unmix( this, where ) != 0 )
 598         {
 599                 // We need to know the current clip and the position within the playlist
 600                 int current = mlt_playlist_current_clip( this );
 601                 mlt_position position = mlt_producer_position( MLT_PLAYLIST_PRODUCER( this ) );
 602
 603                 // We need all the details about the clip we're removing
 604                 mlt_playlist_clip_info where_info;
 605                 playlist_entry *entry = this->list[ where ];
 606                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( entry->producer );
 607
 608                 // Loop variable
 609                 int i = 0;
 610
 611                 // Get the clip info
 612                 mlt_playlist_get_clip_info( this, &where_info, where );
 613
 614                 // Make sure the clip to be removed is valid and correct if necessary
 615                 if ( where < 0 )
 616                         where = 0;
 617                 if ( where >= this->count )
 618                         where = this->count - 1;
 619
 620                 // Reorganise the list
 621                 for ( i = where + 1; i < this->count; i ++ )
 622                         this->list[ i - 1 ] = this->list[ i ];
 623                 this->count --;
 624
 625                 if ( entry->preservation_hack == 0 )
 626                 {
 627                         // Decouple from mix_in/out if necessary
 628                         if ( mlt_properties_get_data( properties, "mix_in", NULL ) != NULL )
 629                         {
 630                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_in", NULL );
 631                                 mlt_properties_set_data( mix, "mix_out", NULL, 0, NULL, NULL );
 632                         }
 633                         if ( mlt_properties_get_data( properties, "mix_out", NULL ) != NULL )
 634                         {
 635                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_out", NULL );
 636                                 mlt_properties_set_data( mix, "mix_in", NULL, 0, NULL, NULL );
 637                         }
 638
 639                         if ( mlt_properties_ref_count( MLT_PRODUCER_PROPERTIES( entry->producer ) ) == 1 )
 640                                 mlt_producer_clear( entry->producer );
 641                 }
 642
 643                 // Close the producer associated to the clip info
 644                 mlt_event_close( entry->event );
 645                 mlt_producer_close( entry->producer );
 646
 647                 // Correct position
 648                 if ( where == current )
 649                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), where_info.start );
 650                 else if ( where < current && this->count > 0 )
 651                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), position - where_info.frame_count );
 652                 else if ( this->count == 0 )
 653                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), 0 );
 654
 655                 // Free the entry
 656                 free( entry );
 657
 658                 // Refresh the playlist
 659                 mlt_playlist_virtual_refresh( this );
 660         }
 661
 662         return error;
 663 }
 664
 665 /** Move an entry in the playlist.
 666 */
 667
 668 int mlt_playlist_move( mlt_playlist this, int src, int dest )
 669 {
 670         int i;
 671
 672         /* We need to ensure that the requested indexes are valid and correct it as necessary */
 673         if ( src < 0 )
 674                 src = 0;
 675         if ( src >= this->count )
 676                 src = this->count - 1;
 677
 678         if ( dest < 0 )
 679                 dest = 0;
 680         if ( dest >= this->count )
 681                 dest = this->count - 1;
 682
 683         if ( src != dest && this->count > 1 )
 684         {
 685                 int current = mlt_playlist_current_clip( this );
 686                 mlt_position position = mlt_producer_position( MLT_PLAYLIST_PRODUCER( this ) );
 687                 playlist_entry *src_entry = NULL;
 688
 689                 // We need all the details about the current clip
 690                 mlt_playlist_clip_info current_info;
 691
 692                 mlt_playlist_get_clip_info( this, &current_info, current );
 693                 position -= current_info.start;
 694
 695                 if ( current == src )
 696                         current = dest;
 697                 else if ( current > src && current < dest )
 698                         current ++;
 699                 else if ( current == dest )
 700                         current = src;
 701
 702                 src_entry = this->list[ src ];
 703                 if ( src > dest )
 704                 {
 705                         for ( i = src; i > dest; i -- )
 706                                 this->list[ i ] = this->list[ i - 1 ];
 707                 }
 708                 else
 709                 {
 710                         for ( i = src; i < dest; i ++ )
 711                                 this->list[ i ] = this->list[ i + 1 ];
 712                 }
 713                 this->list[ dest ] = src_entry;
 714
 715                 mlt_playlist_get_clip_info( this, &current_info, current );
 716                 mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), current_info.start + position );
 717                 mlt_playlist_virtual_refresh( this );
 718         }
 719
 720         return 0;
 721 }
 722
 723 /** Repeat the specified clip n times.
 724 */
 725
 726 int mlt_playlist_repeat_clip( mlt_playlist this, int clip, int repeat )
 727 {
 728         int error = repeat < 1 || clip < 0 || clip >= this->count;
 729         if ( error == 0 )
 730         {
 731                 playlist_entry *entry = this->list[ clip ];
 732                 entry->repeat = repeat;
 733                 mlt_playlist_virtual_refresh( this );
 734         }
 735         return error;
 736 }
 737
 738 /** Resize the specified clip.
 739 */
 740
 741 int mlt_playlist_resize_clip( mlt_playlist this, int clip, mlt_position in, mlt_position out )
 742 {
 743         int error = clip < 0 || clip >= this->count;
 744         if ( error == 0 && mlt_playlist_resize_mix( this, clip, in, out ) != 0 )
 745         {
 746                 playlist_entry *entry = this->list[ clip ];
 747                 mlt_producer producer = entry->producer;
 748                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
 749
 750                 mlt_events_block( properties, properties );
 751
 752                 if ( mlt_producer_is_blank( producer ) )
 753                 {
 754                         // Make sure the blank is long enough to accomodate the length specified
 755                         if ( out - in + 1 > mlt_producer_get_length( &this->blank ) )
 756                         {
 757                                 mlt_properties blank_props = MLT_PRODUCER_PROPERTIES( &this->blank );
 758                                 mlt_properties_set_int( blank_props, "length", out - in + 1 );
 759                                 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( producer ), "length", out - in + 1 );
 760                                 mlt_producer_set_in_and_out( &this->blank, 0, out - in );
 761                         }
 762                 }
 763
 764                 if ( in <= -1 )
 765                         in = 0;
 766                 if ( out <= -1 || out >= mlt_producer_get_length( producer ) )
 767                         out = mlt_producer_get_length( producer ) - 1;
 768
 769                 if ( out < in )
 770                 {
 771                         mlt_position t = in;
 772                         in = out;
 773                         out = t;
 774                 }
 775
 776                 mlt_producer_set_in_and_out( producer, in, out );
 777                 mlt_events_unblock( properties, properties );
 778                 mlt_playlist_virtual_refresh( this );
 779         }
 780         return error;
 781 }
 782
 783 /** Split a clip on the playlist at the given position.
 784 */
 785
 786 int mlt_playlist_split( mlt_playlist this, int clip, mlt_position position )
 787 {
 788         int error = clip < 0 || clip >= this->count;
 789         if ( error == 0 )
 790         {
 791                 playlist_entry *entry = this->list[ clip ];
 792                 position = position < 0 ? entry->frame_count + position - 1 : position;
 793                 if ( position >= 0 && position < entry->frame_count - 1 )
 794                 {
 795                         int in = entry->frame_in;
 796                         int out = entry->frame_out;
 797                         mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 798                         mlt_playlist_resize_clip( this, clip, in, in + position );
 799                         if ( !mlt_producer_is_blank( entry->producer ) )
 800                         {
 801                                 int i = 0;
 802                                 mlt_properties entry_properties = MLT_PRODUCER_PROPERTIES( entry->producer );
 803                                 mlt_producer split = mlt_producer_cut( entry->producer, in + position + 1, out );
 804                                 mlt_properties split_properties = MLT_PRODUCER_PROPERTIES( split );
 805                                 mlt_playlist_insert( this, split, clip + 1, 0, -1 );
 806                                 for ( i = 0; i < mlt_properties_count( entry_properties ); i ++ )
 807                                 {
 808                                         char *name = mlt_properties_get_name( entry_properties, i );
 809                                         if ( name != NULL && !strncmp( name, "meta.", 5 ) )
 810                                                 mlt_properties_set( split_properties, name, mlt_properties_get_value( entry_properties, i ) );
 811                                 }
 812                                 mlt_producer_close( split );
 813                         }
 814                         else
 815                         {
 816                                 mlt_playlist_insert( this, &this->blank, clip + 1, 0, out - position - 1 );
 817                         }
 818                         mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 819                         mlt_playlist_virtual_refresh( this );
 820                 }
 821                 else
 822                 {
 823                         error = 1;
 824                 }
 825         }
 826         return error;
 827 }
 828
 829 /** Split the playlist at the absolute position.
 830 */
 831
 832 int mlt_playlist_split_at( mlt_playlist this, mlt_position position, int left )
 833 {
 834         int result = this == NULL ? -1 : 0;
 835         if ( !result )
 836         {
 837                 if ( position >= 0 && position < mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) ) )
 838                 {
 839                         int clip = mlt_playlist_get_clip_index_at( this, position );
 840                         mlt_playlist_clip_info info;
 841                         mlt_playlist_get_clip_info( this, &info, clip );
 842                         if ( left && position != info.start )
 843                                 mlt_playlist_split( this, clip, position - info.start - 1 );
 844                         else if ( !left )
 845                                 mlt_playlist_split( this, clip, position - info.start );
 846                         result = position;
 847                 }
 848                 else if ( position <= 0 )
 849                 {
 850                         result = 0;
 851                 }
 852                 else
 853                 {
 854                         result = mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
 855                 }
 856         }
 857         return result;
 858 }
 859
 860 /** Join 1 or more consecutive clips.
 861 */
 862
 863 int mlt_playlist_join( mlt_playlist this, int clip, int count, int merge )
 864 {
 865         int error = clip < 0 || clip >= this->count;
 866         if ( error == 0 )
 867         {
 868                 int i = clip;
 869                 mlt_playlist new_clip = mlt_playlist_init( );
 870                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 871                 if ( clip + count >= this->count )
 872                         count = this->count - clip - 1;
 873                 for ( i = 0; i <= count; i ++ )
 874                 {
 875                         playlist_entry *entry = this->list[ clip ];
 876                         mlt_playlist_append( new_clip, entry->producer );
 877                         mlt_playlist_repeat_clip( new_clip, i, entry->repeat );
 878                         entry->preservation_hack = 1;
 879                         mlt_playlist_remove( this, clip );
 880                 }
 881                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 882                 mlt_playlist_insert( this, MLT_PLAYLIST_PRODUCER( new_clip ), clip, 0, -1 );
 883                 mlt_playlist_close( new_clip );
 884         }
 885         return error;
 886 }
 887
 888 /** Mix consecutive clips for a specified length and apply transition if specified.
 889 */
 890
 891 int mlt_playlist_mix( mlt_playlist this, int clip, int length, mlt_transition transition )
 892 {
 893         int error = ( clip < 0 || clip + 1 >= this->count );
 894         if ( error == 0 )
 895         {
 896                 playlist_entry *clip_a = this->list[ clip ];
 897                 playlist_entry *clip_b = this->list[ clip + 1 ];
 898                 mlt_producer track_a = NULL;
 899                 mlt_producer track_b = NULL;
 900                 mlt_tractor tractor = mlt_tractor_new( );
 901                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 902
 903                 // Check length is valid for both clips and resize if necessary.
 904                 int max_size = clip_a->frame_count > clip_b->frame_count ? clip_a->frame_count : clip_b->frame_count;
 905                 length = length > max_size ? max_size : length;
 906
 907                 // Create the a and b tracks/cuts if necessary - note that no cuts are required if the length matches
 908                 if ( length != clip_a->frame_count )
 909                         track_a = mlt_producer_cut( clip_a->producer, clip_a->frame_out - length + 1, clip_a->frame_out );
 910                 else
 911                         track_a = clip_a->producer;
 912
 913                 if ( length != clip_b->frame_count )
 914                         track_b = mlt_producer_cut( clip_b->producer, clip_b->frame_in, clip_b->frame_in + length - 1 );
 915                 else
 916                         track_b = clip_b->producer;
 917
 918                 // Set the tracks on the tractor
 919                 mlt_tractor_set_track( tractor, track_a, 0 );
 920                 mlt_tractor_set_track( tractor, track_b, 1 );
 921
 922                 // Insert the mix object into the playlist
 923                 mlt_playlist_insert( this, MLT_TRACTOR_PRODUCER( tractor ), clip + 1, -1, -1 );
 924                 mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mlt_mix", tractor, 0, NULL, NULL );
 925
 926                 // Attach the transition
 927                 if ( transition != NULL )
 928                 {
 929                         mlt_field field = mlt_tractor_field( tractor );
 930                         mlt_field_plant_transition( field, transition, 0, 1 );
 931                         mlt_transition_set_in_and_out( transition, 0, length - 1 );
 932                 }
 933
 934                 // Close our references to the tracks if we created new cuts above (the tracks can still be used here)
 935                 if ( track_a != clip_a->producer )
 936                         mlt_producer_close( track_a );
 937                 if ( track_b != clip_b->producer )
 938                         mlt_producer_close( track_b );
 939
 940                 // Check if we have anything left on the right hand clip
 941                 if ( track_b == clip_b->producer )
 942                 {
 943                         clip_b->preservation_hack = 1;
 944                         mlt_playlist_remove( this, clip + 2 );
 945                 }
 946                 else if ( clip_b->frame_out - clip_b->frame_in > length )
 947                 {
 948                         mlt_playlist_resize_clip( this, clip + 2, clip_b->frame_in + length, clip_b->frame_out );
 949                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_b->producer ), "mix_in", tractor, 0, NULL, NULL );
 950                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_out", clip_b->producer, 0, NULL, NULL );
 951                 }
 952                 else
 953                 {
 954                         mlt_producer_clear( clip_b->producer );
 955                         mlt_playlist_remove( this, clip + 2 );
 956                 }
 957
 958                 // Check if we have anything left on the left hand clip
 959                 if ( track_a == clip_a->producer )
 960                 {
 961                         clip_a->preservation_hack = 1;
 962                         mlt_playlist_remove( this, clip );
 963                 }
 964                 else if ( clip_a->frame_out - clip_a->frame_in > length )
 965                 {
 966                         mlt_playlist_resize_clip( this, clip, clip_a->frame_in, clip_a->frame_out - length );
 967                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_a->producer ), "mix_out", tractor, 0, NULL, NULL );
 968                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_in", clip_a->producer, 0, NULL, NULL );
 969                 }
 970                 else
 971                 {
 972                         mlt_producer_clear( clip_a->producer );
 973                         mlt_playlist_remove( this, clip );
 974                 }
 975
 976                 // Unblock and force a fire off of change events to listeners
 977                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 978                 mlt_playlist_virtual_refresh( this );
 979                 mlt_tractor_close( tractor );
 980         }
 981         return error;
 982 }
 983
 984 /** Add a transition to an existing mix.
 985 */
 986
 987 int mlt_playlist_mix_add( mlt_playlist this, int clip, mlt_transition transition )
 988 {
 989         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
 990         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
 991         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
 992         int error = transition == NULL || tractor == NULL;
 993         if ( error == 0 )
 994         {
 995                 mlt_field field = mlt_tractor_field( tractor );
 996                 mlt_field_plant_transition( field, transition, 0, 1 );
 997                 mlt_transition_set_in_and_out( transition, 0, this->list[ clip ]->frame_count - 1 );
 998         }
 999         return error;
1000 }
1001
1002 /** Return the clip at the clip index.
1003 */
1004
1005 mlt_producer mlt_playlist_get_clip( mlt_playlist this, int clip )
1006 {
1007         if ( clip >= 0 && clip < this->count )
1008                 return this->list[ clip ]->producer;
1009         return NULL;
1010 }
1011
1012 /** Return the clip at the specified position.
1013 */
1014
1015 mlt_producer mlt_playlist_get_clip_at( mlt_playlist this, mlt_position position )
1016 {
1017         int index = 0, total = 0;
1018         return mlt_playlist_locate( this, &position, &index, &total );
1019 }
1020
1021 /** Return the clip index of the specified position.
1022 */
1023
1024 int mlt_playlist_get_clip_index_at( mlt_playlist this, mlt_position position )
1025 {
1026         int index = 0, total = 0;
1027         mlt_playlist_locate( this, &position, &index, &total );
1028         return index;
1029 }
1030
1031 /** Determine if the clip is a mix.
1032 */
1033
1034 int mlt_playlist_clip_is_mix( mlt_playlist this, int clip )
1035 {
1036         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
1037         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
1038         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
1039         return tractor != NULL;
1040 }
1041
1042 /** Remove a mixed clip - ensure that the cuts included in the mix find their way
1043         back correctly on to the playlist.
1044 */
1045
1046 static int mlt_playlist_unmix( mlt_playlist this, int clip )
1047 {
1048         int error = ( clip < 0 || clip >= this->count );
1049
1050         // Ensure that the clip request is actually a mix
1051         if ( error == 0 )
1052         {
1053                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1054                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1055                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL ||
1056                             this->list[ clip ]->preservation_hack;
1057         }
1058
1059         if ( error == 0 )
1060         {
1061                 playlist_entry *mix = this->list[ clip ];
1062                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1063                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1064                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1065                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1066                 int length = mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1067                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1068
1069                 if ( clip_a != NULL )
1070                 {
1071                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) + length );
1072                 }
1073                 else
1074                 {
1075                         mlt_producer cut = mlt_tractor_get_track( tractor, 0 );
1076                         mlt_playlist_insert( this, cut, clip, -1, -1 );
1077                         clip ++;
1078                 }
1079
1080                 if ( clip_b != NULL )
1081                 {
1082                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) - length, mlt_producer_get_out( clip_b ) );
1083                 }
1084                 else
1085                 {
1086                         mlt_producer cut = mlt_tractor_get_track( tractor, 1 );
1087                         mlt_playlist_insert( this, cut, clip + 1, -1, -1 );
1088                 }
1089
1090                 mlt_properties_set_data( properties, "mlt_mix", NULL, 0, NULL, NULL );
1091                 mlt_playlist_remove( this, clip );
1092                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1093                 mlt_playlist_virtual_refresh( this );
1094         }
1095         return error;
1096 }
1097
1098 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out )
1099 {
1100         int error = ( clip < 0 || clip >= this->count );
1101
1102         // Ensure that the clip request is actually a mix
1103         if ( error == 0 )
1104         {
1105                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1106                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1107                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL;
1108         }
1109
1110         if ( error == 0 )
1111         {
1112                 playlist_entry *mix = this->list[ clip ];
1113                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1114                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1115                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1116                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1117                 mlt_producer track_a = mlt_tractor_get_track( tractor, 0 );
1118                 mlt_producer track_b = mlt_tractor_get_track( tractor, 1 );
1119                 int length = out - in + 1;
1120                 int length_diff = length - mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1121                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1122
1123                 if ( clip_a != NULL )
1124                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) - length_diff );
1125
1126                 if ( clip_b != NULL )
1127                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) + length_diff, mlt_producer_get_out( clip_b ) );
1128
1129                 mlt_producer_set_in_and_out( track_a, mlt_producer_get_in( track_a ) - length_diff, mlt_producer_get_out( track_a ) );
1130                 mlt_producer_set_in_and_out( track_b, mlt_producer_get_in( track_b ), mlt_producer_get_out( track_b ) + length_diff );
1131                 mlt_producer_set_in_and_out( MLT_MULTITRACK_PRODUCER( mlt_tractor_multitrack( tractor ) ), in, out );
1132                 mlt_producer_set_in_and_out( MLT_TRACTOR_PRODUCER( tractor ), in, out );
1133                 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( mix->producer ), "length", out - in + 1 );
1134                 mlt_producer_set_in_and_out( mix->producer, in, out );
1135
1136                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1137                 mlt_playlist_virtual_refresh( this );
1138         }
1139         return error;
1140 }
1141
1142 /** Consolodate adjacent blank producers.
1143 */
1144
1145 void mlt_playlist_consolidate_blanks( mlt_playlist this, int keep_length )
1146 {
1147         if ( this != NULL )
1148         {
1149                 int i = 0;
1150                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1151
1152                 mlt_events_block( properties, properties );
1153                 for ( i = 1; i < this->count; i ++ )
1154                 {
1155                         playlist_entry *left = this->list[ i - 1 ];
1156                         playlist_entry *right = this->list[ i ];
1157
1158                         if ( mlt_producer_is_blank( left->producer ) && mlt_producer_is_blank( right->producer ) )
1159                         {
1160                                 mlt_playlist_resize_clip( this, i - 1, 0, left->frame_count + right->frame_count - 1 );
1161                                 mlt_playlist_remove( this, i -- );
1162                         }
1163                 }
1164
1165                 if ( !keep_length && this->count > 0 )
1166                 {
1167                         playlist_entry *last = this->list[ this->count - 1 ];
1168                         if ( mlt_producer_is_blank( last->producer ) )
1169                                 mlt_playlist_remove( this, this->count - 1 );
1170                 }
1171
1172                 mlt_events_unblock( properties, properties );
1173                 mlt_playlist_virtual_refresh( this );
1174         }
1175 }
1176
1177 /** Determine if the specified clip index is a blank.
1178 */
1179
1180 int mlt_playlist_is_blank( mlt_playlist this, int clip )
1181 {
1182         return this == NULL || mlt_producer_is_blank( mlt_playlist_get_clip( this, clip ) );
1183 }
1184
1185 /** Determine if the specified position is a blank.
1186 */
1187
1188 int mlt_playlist_is_blank_at( mlt_playlist this, mlt_position position )
1189 {
1190         return this == NULL || mlt_producer_is_blank( mlt_playlist_get_clip_at( this, position ) );
1191 }
1192
1193 /** Replace the specified clip with a blank and return the clip.
1194 */
1195
1196 mlt_producer mlt_playlist_replace_with_blank( mlt_playlist this, int clip )
1197 {
1198         mlt_producer producer = NULL;
1199         if ( !mlt_playlist_is_blank( this, clip ) )
1200         {
1201                 playlist_entry *entry = this->list[ clip ];
1202                 int in = entry->frame_in;
1203                 int out = entry->frame_out;
1204                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1205                 producer = entry->producer;
1206                 mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
1207                 mlt_events_block( properties, properties );
1208                 mlt_playlist_remove( this, clip );
1209                 mlt_playlist_blank( this, out - in );
1210                 mlt_playlist_move( this, this->count - 1, clip );
1211                 mlt_events_unblock( properties, properties );
1212                 mlt_playlist_virtual_refresh( this );
1213                 mlt_producer_set_in_and_out( producer, in, out );
1214         }
1215         return producer;
1216 }
1217
1218 void mlt_playlist_insert_blank( mlt_playlist this, int clip, int length )
1219 {
1220         if ( this != NULL && length >= 0 )
1221         {
1222                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1223                 mlt_events_block( properties, properties );
1224                 mlt_playlist_blank( this, length );
1225                 mlt_playlist_move( this, this->count - 1, clip );
1226                 mlt_events_unblock( properties, properties );
1227                 mlt_playlist_virtual_refresh( this );
1228         }
1229 }
1230
1231 void mlt_playlist_pad_blanks( mlt_playlist this, mlt_position position, int length, int find )
1232 {
1233         if ( this != NULL && length != 0 )
1234         {
1235                 int clip = mlt_playlist_get_clip_index_at( this, position );
1236                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1237                 mlt_events_block( properties, properties );
1238                 if ( find && clip < this->count && !mlt_playlist_is_blank( this, clip ) )
1239                         clip ++;
1240                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1241                 {
1242                         mlt_playlist_clip_info info;
1243                         mlt_playlist_get_clip_info( this, &info, clip );
1244                         if ( info.frame_out + length > info.frame_in )
1245                                 mlt_playlist_resize_clip( this, clip, info.frame_in, info.frame_out + length );
1246                         else
1247                                 mlt_playlist_remove( this, clip );
1248                 }
1249                 else if ( find && clip < this->count && length > 0  )
1250                 {
1251                         mlt_playlist_insert_blank( this, clip, length );
1252                 }
1253                 mlt_events_unblock( properties, properties );
1254                 mlt_playlist_virtual_refresh( this );
1255         }
1256 }
1257
1258 int mlt_playlist_insert_at( mlt_playlist this, mlt_position position, mlt_producer producer, int mode )
1259 {
1260         int ret = this == NULL || position < 0 || producer == NULL;
1261         if ( ret == 0 )
1262         {
1263                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1264                 int length = mlt_producer_get_playtime( producer );
1265                 int clip = mlt_playlist_get_clip_index_at( this, position );
1266                 mlt_playlist_clip_info info;
1267                 mlt_playlist_get_clip_info( this, &info, clip );
1268                 mlt_events_block( properties, this );
1269                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1270                 {
1271                         // Split and move to new clip if need be
1272                         if ( position != info.start && mlt_playlist_split( this, clip, position - info.start - 1 ) == 0 )
1273                                 mlt_playlist_get_clip_info( this, &info, ++ clip );
1274
1275                         // Split again if need be
1276                         if ( length < info.frame_count )
1277                                 mlt_playlist_split( this, clip, length - 1 );
1278
1279                         // Remove
1280                         mlt_playlist_remove( this, clip );
1281
1282                         // Insert
1283                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1284                         ret = clip;
1285                 }
1286                 else if ( clip < this->count )
1287                 {
1288                         if ( position > info.start + info.frame_count / 2 )
1289                                 clip ++;
1290                         if ( mode == 1 && clip < this->count && mlt_playlist_is_blank( this, clip ) )
1291                         {
1292                                 mlt_playlist_get_clip_info( this, &info, clip );
1293                                 if ( length < info.frame_count )
1294                                         mlt_playlist_split( this, clip, length );
1295                                 mlt_playlist_remove( this, clip );
1296                         }
1297                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1298                         ret = clip;
1299                 }
1300                 else
1301                 {
1302                         if ( mode == 1 ) {
1303                                 if ( position == info.start )
1304                                         mlt_playlist_remove( this, clip );
1305                                 else
1306                                         mlt_playlist_blank( this, position - mlt_properties_get_int( properties, "length" ) - 1 );
1307                         }
1308                         mlt_playlist_append( this, producer );
1309                         ret = this->count - 1;
1310                 }
1311                 mlt_events_unblock( properties, this );
1312                 mlt_playlist_virtual_refresh( this );
1313         }
1314         else
1315         {
1316                 ret = -1;
1317         }
1318         return ret;
1319 }
1320
1321 int mlt_playlist_clip_start( mlt_playlist this, int clip )
1322 {
1323         mlt_playlist_clip_info info;
1324         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1325                 return info.start;
1326         return clip < 0 ? 0 : mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
1327 }
1328
1329 int mlt_playlist_clip_length( mlt_playlist this, int clip )
1330 {
1331         mlt_playlist_clip_info info;
1332         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1333                 return info.frame_count;
1334         return 0;
1335 }
1336
1337 int mlt_playlist_blanks_from( mlt_playlist this, int clip, int bounded )
1338 {
1339         int count = 0;
1340         mlt_playlist_clip_info info;
1341         if ( this != NULL && clip < this->count )
1342         {
1343                 mlt_playlist_get_clip_info( this, &info, clip );
1344                 if ( mlt_playlist_is_blank( this, clip ) )
1345                         count += info.frame_count;
1346                 if ( bounded == 0 )
1347                         bounded = this->count;
1348                 for ( clip ++; clip < this->count && bounded >= 0; clip ++ )
1349                 {
1350                         mlt_playlist_get_clip_info( this, &info, clip );
1351                         if ( mlt_playlist_is_blank( this, clip ) )
1352                                 count += info.frame_count;
1353                         else
1354                                 bounded --;
1355                 }
1356         }
1357         return count;
1358 }
1359
1360 int mlt_playlist_remove_region( mlt_playlist this, mlt_position position, int length )
1361 {
1362         int index = mlt_playlist_get_clip_index_at( this, position );
1363         if ( index >= 0 && index < this->count )
1364         {
1365                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1366                 int clip_start = mlt_playlist_clip_start( this, index );
1367                 int clip_length = mlt_playlist_clip_length( this, index );
1368                 int list_length = mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
1369                 mlt_events_block( properties, this );
1370
1371                 if ( position + length > list_length )
1372                         length -= ( position + length - list_length );
1373
1374                 if ( clip_start < position )
1375                 {
1376                         mlt_playlist_split( this, index ++, position - clip_start );
1377                         clip_length -= position - clip_start;
1378                 }
1379
1380                 while( length > 0 )
1381                 {
1382                         if ( mlt_playlist_clip_length( this, index ) > length )
1383                                 mlt_playlist_split( this, index, length );
1384                         length -= mlt_playlist_clip_length( this, index );
1385                         mlt_playlist_remove( this, index );
1386                 }
1387
1388                 mlt_playlist_consolidate_blanks( this, 0 );
1389                 mlt_events_unblock( properties, this );
1390                 mlt_playlist_virtual_refresh( this );
1391
1392                 // Just to be sure, we'll get the clip index again...
1393                 index = mlt_playlist_get_clip_index_at( this, position );
1394         }
1395         return index;
1396 }
1397
1398 int mlt_playlist_move_region( mlt_playlist this, mlt_position position, int length, int new_position )
1399 {
1400         if ( this != NULL )
1401         {
1402         }
1403         return 0;
1404 }
1405
1406 /** Get the current frame.
1407 */
1408
1409 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
1410 {
1411         // Check that we have a producer
1412         if ( producer == NULL )
1413         {
1414                 *frame = NULL;
1415                 return -1;
1416         }
1417
1418         // Get this mlt_playlist
1419         mlt_playlist this = producer->child;
1420
1421         // Need to ensure the frame is deinterlaced when repeating 1 frame
1422         int progressive = 0;
1423
1424         // Get the real producer
1425         mlt_service real = mlt_playlist_virtual_seek( this, &progressive );
1426
1427         // Check that we have a producer
1428         if ( real == NULL )
1429         {
1430                 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
1431                 return 0;
1432         }
1433
1434         // Get the frame
1435         if ( !mlt_properties_get_int( MLT_SERVICE_PROPERTIES( real ), "meta.fx_cut" ) )
1436         {
1437                 mlt_service_get_frame( real, frame, index );
1438         }
1439         else
1440         {
1441                 mlt_producer parent = mlt_producer_cut_parent( ( mlt_producer )real );
1442                 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( parent ) );
1443                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "fx_cut", 1 );
1444                 mlt_frame_push_service( *frame, NULL );
1445                 mlt_frame_push_audio( *frame, NULL );
1446                 mlt_service_apply_filters( MLT_PRODUCER_SERVICE( parent ), *frame, 0 );
1447                 mlt_service_apply_filters( real, *frame, 0 );
1448                 mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( *frame ) );
1449                 mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( *frame ) );
1450         }
1451
1452         // Check if we're at the end of the clip
1453         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
1454         if ( mlt_properties_get_int( properties, "end_of_clip" ) )
1455                 mlt_playlist_virtual_set_out( this );
1456
1457         // Set the consumer progressive property
1458         if ( progressive )
1459         {
1460                 mlt_properties_set_int( properties, "consumer_deinterlace", progressive );
1461                 mlt_properties_set_int( properties, "test_audio", 1 );
1462         }
1463
1464         // Check for notifier and call with appropriate argument
1465         mlt_properties playlist_properties = MLT_PRODUCER_PROPERTIES( producer );
1466         void ( *notifier )( void * ) = mlt_properties_get_data( playlist_properties, "notifier", NULL );
1467         if ( notifier != NULL )
1468         {
1469                 void *argument = mlt_properties_get_data( playlist_properties, "notifier_arg", NULL );
1470                 notifier( argument );
1471         }
1472
1473         // Update position on the frame we're creating
1474         mlt_frame_set_position( *frame, mlt_producer_frame( producer ) );
1475
1476         // Position ourselves on the next frame
1477         mlt_producer_prepare_next( producer );
1478
1479         return 0;
1480 }
1481
1482 /** Close the playlist.
1483 */
1484
1485 void mlt_playlist_close( mlt_playlist this )
1486 {
1487         if ( this != NULL && mlt_properties_dec_ref( MLT_PLAYLIST_PROPERTIES( this ) ) <= 0 )
1488         {
1489                 int i = 0;
1490                 this->parent.close = NULL;
1491                 for ( i = 0; i < this->count; i ++ )
1492                 {
1493                         mlt_event_close( this->list[ i ]->event );
1494                         mlt_producer_close( this->list[ i ]->producer );
1495                         free( this->list[ i ] );
1496                 }
1497                 mlt_producer_close( &this->blank );
1498                 mlt_producer_close( &this->parent );
1499                 free( this->list );
1500                 free( this );
1501         }
1502 }