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         // Automatically close previous producers if requested
 337         if ( i > 1 // keep immediate previous in case app wants to get info about what just finished
 338                 && position < 2 // tolerate off-by-one error on going to next clip
 339                 && mlt_properties_get_int( properties, "autoclose" ) )
 340         {
 341                 int j;
 342                 // They might have jumped ahead!
 343                 for ( j = 0; j < i - 1; j++ )
 344                 {
 345                         mlt_service_lock( MLT_PRODUCER_SERVICE( this->list[ j ]->producer ) );
 346                         mlt_producer p = this->list[ j ]->producer;
 347                         if ( p )
 348                         {
 349                                 this->list[ j ]->producer = NULL;
 350                                 mlt_service_unlock( MLT_PRODUCER_SERVICE( p ) );
 351                                 mlt_producer_close( p );
 352                         }
 353                         // If p is null, the lock will not have been "taken"
 354                 }
 355         }
 356
 357         // Get the eof handling
 358         char *eof = mlt_properties_get( properties, "eof" );
 359
 360         // Seek in real producer to relative position
 361         if ( producer != NULL )
 362         {
 363                 int count = this->list[ i ]->frame_count / this->list[ i ]->repeat;
 364                 *progressive = count == 1;
 365                 mlt_producer_seek( producer, (int)position % count );
 366         }
 367         else if ( !strcmp( eof, "pause" ) && total > 0 )
 368         {
 369                 playlist_entry *entry = this->list[ this->count - 1 ];
 370                 int count = entry->frame_count / entry->repeat;
 371                 mlt_producer this_producer = MLT_PLAYLIST_PRODUCER( this );
 372                 mlt_producer_seek( this_producer, original - 1 );
 373                 producer = entry->producer;
 374                 mlt_producer_seek( producer, (int)entry->frame_out % count );
 375                 mlt_producer_set_speed( this_producer, 0 );
 376                 mlt_producer_set_speed( producer, 0 );
 377                 *progressive = count == 1;
 378         }
 379         else if ( !strcmp( eof, "loop" ) && total > 0 )
 380         {
 381                 playlist_entry *entry = this->list[ 0 ];
 382                 mlt_producer this_producer = MLT_PLAYLIST_PRODUCER( this );
 383                 mlt_producer_seek( this_producer, 0 );
 384                 producer = entry->producer;
 385                 mlt_producer_seek( producer, 0 );
 386         }
 387         else
 388         {
 389                 producer = &this->blank;
 390         }
 391
 392         return MLT_PRODUCER_SERVICE( producer );
 393 }
 394
 395 /** Invoked when a producer indicates that it has prematurely reached its end.
 396 */
 397
 398 static mlt_producer mlt_playlist_virtual_set_out( mlt_playlist this )
 399 {
 400         // Default producer to blank
 401         mlt_producer producer = &this->blank;
 402
 403         // Map playlist position to real producer in virtual playlist
 404         mlt_position position = mlt_producer_frame( &this->parent );
 405
 406         // Loop through the virtual playlist
 407         int i = 0;
 408
 409         for ( i = 0; i < this->count; i ++ )
 410         {
 411                 if ( position < this->list[ i ]->frame_count )
 412                 {
 413                         // Found it, now break
 414                         producer = this->list[ i ]->producer;
 415                         break;
 416                 }
 417                 else
 418                 {
 419                         // Decrement position by length of this entry
 420                         position -= this->list[ i ]->frame_count;
 421                 }
 422         }
 423
 424         // Seek in real producer to relative position
 425         if ( i < this->count && this->list[ i ]->frame_out != position )
 426         {
 427                 // Update the frame_count for the changed clip (hmmm)
 428                 this->list[ i ]->frame_out = position;
 429                 this->list[ i ]->frame_count = this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1;
 430
 431                 // Refresh the playlist
 432                 mlt_playlist_virtual_refresh( this );
 433         }
 434
 435         return producer;
 436 }
 437
 438 /** Obtain the current clips index.
 439 */
 440
 441 int mlt_playlist_current_clip( mlt_playlist this )
 442 {
 443         // Map playlist position to real producer in virtual playlist
 444         mlt_position position = mlt_producer_frame( &this->parent );
 445
 446         // Loop through the virtual playlist
 447         int i = 0;
 448
 449         for ( i = 0; i < this->count; i ++ )
 450         {
 451                 if ( position < this->list[ i ]->frame_count )
 452                 {
 453                         // Found it, now break
 454                         break;
 455                 }
 456                 else
 457                 {
 458                         // Decrement position by length of this entry
 459                         position -= this->list[ i ]->frame_count;
 460                 }
 461         }
 462
 463         return i;
 464 }
 465
 466 /** Obtain the current clips producer.
 467 */
 468
 469 mlt_producer mlt_playlist_current( mlt_playlist this )
 470 {
 471         int i = mlt_playlist_current_clip( this );
 472         if ( i < this->count )
 473                 return this->list[ i ]->producer;
 474         else
 475                 return &this->blank;
 476 }
 477
 478 /** Get the position which corresponds to the start of the next clip.
 479 */
 480
 481 mlt_position mlt_playlist_clip( mlt_playlist this, mlt_whence whence, int index )
 482 {
 483         mlt_position position = 0;
 484         int absolute_clip = index;
 485         int i = 0;
 486
 487         // Determine the absolute clip
 488         switch ( whence )
 489         {
 490                 case mlt_whence_relative_start:
 491                         absolute_clip = index;
 492                         break;
 493
 494                 case mlt_whence_relative_current:
 495                         absolute_clip = mlt_playlist_current_clip( this ) + index;
 496                         break;
 497
 498                 case mlt_whence_relative_end:
 499                         absolute_clip = this->count - index;
 500                         break;
 501         }
 502
 503         // Check that we're in a valid range
 504         if ( absolute_clip < 0 )
 505                 absolute_clip = 0;
 506         else if ( absolute_clip > this->count )
 507                 absolute_clip = this->count;
 508
 509         // Now determine the position
 510         for ( i = 0; i < absolute_clip; i ++ )
 511                 position += this->list[ i ]->frame_count;
 512
 513         return position;
 514 }
 515
 516 /** Get all the info about the clip specified.
 517 */
 518
 519 int mlt_playlist_get_clip_info( mlt_playlist this, mlt_playlist_clip_info *info, int index )
 520 {
 521         int error = index < 0 || index >= this->count;
 522         memset( info, 0, sizeof( mlt_playlist_clip_info ) );
 523         if ( !error )
 524         {
 525                 mlt_producer producer = mlt_producer_cut_parent( this->list[ index ]->producer );
 526                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 527                 info->clip = index;
 528                 info->producer = producer;
 529                 info->cut = this->list[ index ]->producer;
 530                 info->start = mlt_playlist_clip( this, mlt_whence_relative_start, index );
 531                 info->resource = mlt_properties_get( properties, "resource" );
 532                 info->frame_in = this->list[ index ]->frame_in;
 533                 info->frame_out = this->list[ index ]->frame_out;
 534                 info->frame_count = this->list[ index ]->frame_count;
 535                 info->repeat = this->list[ index ]->repeat;
 536                 info->length = mlt_producer_get_length( producer );
 537                 info->fps = mlt_producer_get_fps( producer );
 538         }
 539
 540         return error;
 541 }
 542
 543 /** Get number of clips in the playlist.
 544 */
 545
 546 int mlt_playlist_count( mlt_playlist this )
 547 {
 548         return this->count;
 549 }
 550
 551 /** Clear the playlist.
 552 */
 553
 554 int mlt_playlist_clear( mlt_playlist this )
 555 {
 556         int i;
 557         for ( i = 0; i < this->count; i ++ )
 558         {
 559                 mlt_event_close( this->list[ i ]->event );
 560                 mlt_producer_close( this->list[ i ]->producer );
 561         }
 562         this->count = 0;
 563         return mlt_playlist_virtual_refresh( this );
 564 }
 565
 566 /** Append a producer to the playlist.
 567 */
 568
 569 int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
 570 {
 571         // Append to virtual list
 572         return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) - 1 );
 573 }
 574
 575 /** Append a producer to the playlist with in/out points.
 576 */
 577
 578 int mlt_playlist_append_io( mlt_playlist this, mlt_producer producer, mlt_position in, mlt_position out )
 579 {
 580         // Append to virtual list
 581         if ( in != -1 && out != -1 )
 582                 return mlt_playlist_virtual_append( this, producer, in, out );
 583         else
 584                 return mlt_playlist_append( this, producer );
 585 }
 586
 587 /** Append a blank to the playlist of a given length.
 588 */
 589
 590 int mlt_playlist_blank( mlt_playlist this, mlt_position length )
 591 {
 592         // Append to the virtual list
 593         return mlt_playlist_virtual_append( this, &this->blank, 0, length );
 594 }
 595
 596 /** Insert a producer into the playlist.
 597 */
 598
 599 int mlt_playlist_insert( mlt_playlist this, mlt_producer producer, int where, mlt_position in, mlt_position out )
 600 {
 601         // Append to end
 602         mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 603         mlt_playlist_append_io( this, producer, in, out );
 604
 605         // Move to the position specified
 606         mlt_playlist_move( this, this->count - 1, where );
 607         mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 608
 609         return mlt_playlist_virtual_refresh( this );
 610 }
 611
 612 /** Remove an entry in the playlist.
 613 */
 614
 615 int mlt_playlist_remove( mlt_playlist this, int where )
 616 {
 617         int error = where < 0 || where >= this->count;
 618         if ( error == 0 && mlt_playlist_unmix( this, where ) != 0 )
 619         {
 620                 // We need to know the current clip and the position within the playlist
 621                 int current = mlt_playlist_current_clip( this );
 622                 mlt_position position = mlt_producer_position( MLT_PLAYLIST_PRODUCER( this ) );
 623
 624                 // We need all the details about the clip we're removing
 625                 mlt_playlist_clip_info where_info;
 626                 playlist_entry *entry = this->list[ where ];
 627                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( entry->producer );
 628
 629                 // Loop variable
 630                 int i = 0;
 631
 632                 // Get the clip info
 633                 mlt_playlist_get_clip_info( this, &where_info, where );
 634
 635                 // Make sure the clip to be removed is valid and correct if necessary
 636                 if ( where < 0 )
 637                         where = 0;
 638                 if ( where >= this->count )
 639                         where = this->count - 1;
 640
 641                 // Reorganise the list
 642                 for ( i = where + 1; i < this->count; i ++ )
 643                         this->list[ i - 1 ] = this->list[ i ];
 644                 this->count --;
 645
 646                 if ( entry->preservation_hack == 0 )
 647                 {
 648                         // Decouple from mix_in/out if necessary
 649                         if ( mlt_properties_get_data( properties, "mix_in", NULL ) != NULL )
 650                         {
 651                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_in", NULL );
 652                                 mlt_properties_set_data( mix, "mix_out", NULL, 0, NULL, NULL );
 653                         }
 654                         if ( mlt_properties_get_data( properties, "mix_out", NULL ) != NULL )
 655                         {
 656                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_out", NULL );
 657                                 mlt_properties_set_data( mix, "mix_in", NULL, 0, NULL, NULL );
 658                         }
 659
 660                         if ( mlt_properties_ref_count( MLT_PRODUCER_PROPERTIES( entry->producer ) ) == 1 )
 661                                 mlt_producer_clear( entry->producer );
 662                 }
 663
 664                 // Close the producer associated to the clip info
 665                 mlt_event_close( entry->event );
 666                 mlt_producer_close( entry->producer );
 667
 668                 // Correct position
 669                 if ( where == current )
 670                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), where_info.start );
 671                 else if ( where < current && this->count > 0 )
 672                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), position - where_info.frame_count );
 673                 else if ( this->count == 0 )
 674                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), 0 );
 675
 676                 // Free the entry
 677                 free( entry );
 678
 679                 // Refresh the playlist
 680                 mlt_playlist_virtual_refresh( this );
 681         }
 682
 683         return error;
 684 }
 685
 686 /** Move an entry in the playlist.
 687 */
 688
 689 int mlt_playlist_move( mlt_playlist this, int src, int dest )
 690 {
 691         int i;
 692
 693         /* We need to ensure that the requested indexes are valid and correct it as necessary */
 694         if ( src < 0 )
 695                 src = 0;
 696         if ( src >= this->count )
 697                 src = this->count - 1;
 698
 699         if ( dest < 0 )
 700                 dest = 0;
 701         if ( dest >= this->count )
 702                 dest = this->count - 1;
 703
 704         if ( src != dest && this->count > 1 )
 705         {
 706                 int current = mlt_playlist_current_clip( this );
 707                 mlt_position position = mlt_producer_position( MLT_PLAYLIST_PRODUCER( this ) );
 708                 playlist_entry *src_entry = NULL;
 709
 710                 // We need all the details about the current clip
 711                 mlt_playlist_clip_info current_info;
 712
 713                 mlt_playlist_get_clip_info( this, &current_info, current );
 714                 position -= current_info.start;
 715
 716                 if ( current == src )
 717                         current = dest;
 718                 else if ( current > src && current < dest )
 719                         current ++;
 720                 else if ( current == dest )
 721                         current = src;
 722
 723                 src_entry = this->list[ src ];
 724                 if ( src > dest )
 725                 {
 726                         for ( i = src; i > dest; i -- )
 727                                 this->list[ i ] = this->list[ i - 1 ];
 728                 }
 729                 else
 730                 {
 731                         for ( i = src; i < dest; i ++ )
 732                                 this->list[ i ] = this->list[ i + 1 ];
 733                 }
 734                 this->list[ dest ] = src_entry;
 735
 736                 mlt_playlist_get_clip_info( this, &current_info, current );
 737                 mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), current_info.start + position );
 738                 mlt_playlist_virtual_refresh( this );
 739         }
 740
 741         return 0;
 742 }
 743
 744 /** Repeat the specified clip n times.
 745 */
 746
 747 int mlt_playlist_repeat_clip( mlt_playlist this, int clip, int repeat )
 748 {
 749         int error = repeat < 1 || clip < 0 || clip >= this->count;
 750         if ( error == 0 )
 751         {
 752                 playlist_entry *entry = this->list[ clip ];
 753                 entry->repeat = repeat;
 754                 mlt_playlist_virtual_refresh( this );
 755         }
 756         return error;
 757 }
 758
 759 /** Resize the specified clip.
 760 */
 761
 762 int mlt_playlist_resize_clip( mlt_playlist this, int clip, mlt_position in, mlt_position out )
 763 {
 764         int error = clip < 0 || clip >= this->count;
 765         if ( error == 0 && mlt_playlist_resize_mix( this, clip, in, out ) != 0 )
 766         {
 767                 playlist_entry *entry = this->list[ clip ];
 768                 mlt_producer producer = entry->producer;
 769                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
 770
 771                 mlt_events_block( properties, properties );
 772
 773                 if ( mlt_producer_is_blank( producer ) )
 774                 {
 775                         // Make sure the blank is long enough to accomodate the length specified
 776                         if ( out - in + 1 > mlt_producer_get_length( &this->blank ) )
 777                         {
 778                                 mlt_properties blank_props = MLT_PRODUCER_PROPERTIES( &this->blank );
 779                                 mlt_properties_set_int( blank_props, "length", out - in + 1 );
 780                                 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( producer ), "length", out - in + 1 );
 781                                 mlt_producer_set_in_and_out( &this->blank, 0, out - in );
 782                         }
 783                 }
 784
 785                 if ( in <= -1 )
 786                         in = 0;
 787                 if ( out <= -1 || out >= mlt_producer_get_length( producer ) )
 788                         out = mlt_producer_get_length( producer ) - 1;
 789
 790                 if ( out < in )
 791                 {
 792                         mlt_position t = in;
 793                         in = out;
 794                         out = t;
 795                 }
 796
 797                 mlt_producer_set_in_and_out( producer, in, out );
 798                 mlt_events_unblock( properties, properties );
 799                 mlt_playlist_virtual_refresh( this );
 800         }
 801         return error;
 802 }
 803
 804 /** Split a clip on the playlist at the given position.
 805 */
 806
 807 int mlt_playlist_split( mlt_playlist this, int clip, mlt_position position )
 808 {
 809         int error = clip < 0 || clip >= this->count;
 810         if ( error == 0 )
 811         {
 812                 playlist_entry *entry = this->list[ clip ];
 813                 position = position < 0 ? entry->frame_count + position - 1 : position;
 814                 if ( position >= 0 && position < entry->frame_count - 1 )
 815                 {
 816                         int in = entry->frame_in;
 817                         int out = entry->frame_out;
 818                         mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 819                         mlt_playlist_resize_clip( this, clip, in, in + position );
 820                         if ( !mlt_producer_is_blank( entry->producer ) )
 821                         {
 822                                 int i = 0;
 823                                 mlt_properties entry_properties = MLT_PRODUCER_PROPERTIES( entry->producer );
 824                                 mlt_producer split = mlt_producer_cut( entry->producer, in + position + 1, out );
 825                                 mlt_properties split_properties = MLT_PRODUCER_PROPERTIES( split );
 826                                 mlt_playlist_insert( this, split, clip + 1, 0, -1 );
 827                                 for ( i = 0; i < mlt_properties_count( entry_properties ); i ++ )
 828                                 {
 829                                         char *name = mlt_properties_get_name( entry_properties, i );
 830                                         if ( name != NULL && !strncmp( name, "meta.", 5 ) )
 831                                                 mlt_properties_set( split_properties, name, mlt_properties_get_value( entry_properties, i ) );
 832                                 }
 833                                 mlt_producer_close( split );
 834                         }
 835                         else
 836                         {
 837                                 mlt_playlist_insert( this, &this->blank, clip + 1, 0, out - position - 1 );
 838                         }
 839                         mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 840                         mlt_playlist_virtual_refresh( this );
 841                 }
 842                 else
 843                 {
 844                         error = 1;
 845                 }
 846         }
 847         return error;
 848 }
 849
 850 /** Split the playlist at the absolute position.
 851 */
 852
 853 int mlt_playlist_split_at( mlt_playlist this, mlt_position position, int left )
 854 {
 855         int result = this == NULL ? -1 : 0;
 856         if ( !result )
 857         {
 858                 if ( position >= 0 && position < mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) ) )
 859                 {
 860                         int clip = mlt_playlist_get_clip_index_at( this, position );
 861                         mlt_playlist_clip_info info;
 862                         mlt_playlist_get_clip_info( this, &info, clip );
 863                         if ( left && position != info.start )
 864                                 mlt_playlist_split( this, clip, position - info.start - 1 );
 865                         else if ( !left )
 866                                 mlt_playlist_split( this, clip, position - info.start );
 867                         result = position;
 868                 }
 869                 else if ( position <= 0 )
 870                 {
 871                         result = 0;
 872                 }
 873                 else
 874                 {
 875                         result = mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
 876                 }
 877         }
 878         return result;
 879 }
 880
 881 /** Join 1 or more consecutive clips.
 882 */
 883
 884 int mlt_playlist_join( mlt_playlist this, int clip, int count, int merge )
 885 {
 886         int error = clip < 0 || clip >= this->count;
 887         if ( error == 0 )
 888         {
 889                 int i = clip;
 890                 mlt_playlist new_clip = mlt_playlist_init( );
 891                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 892                 if ( clip + count >= this->count )
 893                         count = this->count - clip - 1;
 894                 for ( i = 0; i <= count; i ++ )
 895                 {
 896                         playlist_entry *entry = this->list[ clip ];
 897                         mlt_playlist_append( new_clip, entry->producer );
 898                         mlt_playlist_repeat_clip( new_clip, i, entry->repeat );
 899                         entry->preservation_hack = 1;
 900                         mlt_playlist_remove( this, clip );
 901                 }
 902                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 903                 mlt_playlist_insert( this, MLT_PLAYLIST_PRODUCER( new_clip ), clip, 0, -1 );
 904                 mlt_playlist_close( new_clip );
 905         }
 906         return error;
 907 }
 908
 909 /** Mix consecutive clips for a specified length and apply transition if specified.
 910 */
 911
 912 int mlt_playlist_mix( mlt_playlist this, int clip, int length, mlt_transition transition )
 913 {
 914         int error = ( clip < 0 || clip + 1 >= this->count );
 915         if ( error == 0 )
 916         {
 917                 playlist_entry *clip_a = this->list[ clip ];
 918                 playlist_entry *clip_b = this->list[ clip + 1 ];
 919                 mlt_producer track_a = NULL;
 920                 mlt_producer track_b = NULL;
 921                 mlt_tractor tractor = mlt_tractor_new( );
 922                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 923
 924                 // Check length is valid for both clips and resize if necessary.
 925                 int max_size = clip_a->frame_count > clip_b->frame_count ? clip_a->frame_count : clip_b->frame_count;
 926                 length = length > max_size ? max_size : length;
 927
 928                 // Create the a and b tracks/cuts if necessary - note that no cuts are required if the length matches
 929                 if ( length != clip_a->frame_count )
 930                         track_a = mlt_producer_cut( clip_a->producer, clip_a->frame_out - length + 1, clip_a->frame_out );
 931                 else
 932                         track_a = clip_a->producer;
 933
 934                 if ( length != clip_b->frame_count )
 935                         track_b = mlt_producer_cut( clip_b->producer, clip_b->frame_in, clip_b->frame_in + length - 1 );
 936                 else
 937                         track_b = clip_b->producer;
 938
 939                 // Set the tracks on the tractor
 940                 mlt_tractor_set_track( tractor, track_a, 0 );
 941                 mlt_tractor_set_track( tractor, track_b, 1 );
 942
 943                 // Insert the mix object into the playlist
 944                 mlt_playlist_insert( this, MLT_TRACTOR_PRODUCER( tractor ), clip + 1, -1, -1 );
 945                 mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mlt_mix", tractor, 0, NULL, NULL );
 946
 947                 // Attach the transition
 948                 if ( transition != NULL )
 949                 {
 950                         mlt_field field = mlt_tractor_field( tractor );
 951                         mlt_field_plant_transition( field, transition, 0, 1 );
 952                         mlt_transition_set_in_and_out( transition, 0, length - 1 );
 953                 }
 954
 955                 // Close our references to the tracks if we created new cuts above (the tracks can still be used here)
 956                 if ( track_a != clip_a->producer )
 957                         mlt_producer_close( track_a );
 958                 if ( track_b != clip_b->producer )
 959                         mlt_producer_close( track_b );
 960
 961                 // Check if we have anything left on the right hand clip
 962                 if ( track_b == clip_b->producer )
 963                 {
 964                         clip_b->preservation_hack = 1;
 965                         mlt_playlist_remove( this, clip + 2 );
 966                 }
 967                 else if ( clip_b->frame_out - clip_b->frame_in > length )
 968                 {
 969                         mlt_playlist_resize_clip( this, clip + 2, clip_b->frame_in + length, clip_b->frame_out );
 970                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_b->producer ), "mix_in", tractor, 0, NULL, NULL );
 971                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_out", clip_b->producer, 0, NULL, NULL );
 972                 }
 973                 else
 974                 {
 975                         mlt_producer_clear( clip_b->producer );
 976                         mlt_playlist_remove( this, clip + 2 );
 977                 }
 978
 979                 // Check if we have anything left on the left hand clip
 980                 if ( track_a == clip_a->producer )
 981                 {
 982                         clip_a->preservation_hack = 1;
 983                         mlt_playlist_remove( this, clip );
 984                 }
 985                 else if ( clip_a->frame_out - clip_a->frame_in > length )
 986                 {
 987                         mlt_playlist_resize_clip( this, clip, clip_a->frame_in, clip_a->frame_out - length );
 988                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_a->producer ), "mix_out", tractor, 0, NULL, NULL );
 989                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_in", clip_a->producer, 0, NULL, NULL );
 990                 }
 991                 else
 992                 {
 993                         mlt_producer_clear( clip_a->producer );
 994                         mlt_playlist_remove( this, clip );
 995                 }
 996
 997                 // Unblock and force a fire off of change events to listeners
 998                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 999                 mlt_playlist_virtual_refresh( this );
1000                 mlt_tractor_close( tractor );
1001         }
1002         return error;
1003 }
1004
1005 /** Add a transition to an existing mix.
1006 */
1007
1008 int mlt_playlist_mix_add( mlt_playlist this, int clip, mlt_transition transition )
1009 {
1010         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
1011         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
1012         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
1013         int error = transition == NULL || tractor == NULL;
1014         if ( error == 0 )
1015         {
1016                 mlt_field field = mlt_tractor_field( tractor );
1017                 mlt_field_plant_transition( field, transition, 0, 1 );
1018                 mlt_transition_set_in_and_out( transition, 0, this->list[ clip ]->frame_count - 1 );
1019         }
1020         return error;
1021 }
1022
1023 /** Return the clip at the clip index.
1024 */
1025
1026 mlt_producer mlt_playlist_get_clip( mlt_playlist this, int clip )
1027 {
1028         if ( clip >= 0 && clip < this->count )
1029                 return this->list[ clip ]->producer;
1030         return NULL;
1031 }
1032
1033 /** Return the clip at the specified position.
1034 */
1035
1036 mlt_producer mlt_playlist_get_clip_at( mlt_playlist this, mlt_position position )
1037 {
1038         int index = 0, total = 0;
1039         return mlt_playlist_locate( this, &position, &index, &total );
1040 }
1041
1042 /** Return the clip index of the specified position.
1043 */
1044
1045 int mlt_playlist_get_clip_index_at( mlt_playlist this, mlt_position position )
1046 {
1047         int index = 0, total = 0;
1048         mlt_playlist_locate( this, &position, &index, &total );
1049         return index;
1050 }
1051
1052 /** Determine if the clip is a mix.
1053 */
1054
1055 int mlt_playlist_clip_is_mix( mlt_playlist this, int clip )
1056 {
1057         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
1058         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
1059         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
1060         return tractor != NULL;
1061 }
1062
1063 /** Remove a mixed clip - ensure that the cuts included in the mix find their way
1064         back correctly on to the playlist.
1065 */
1066
1067 static int mlt_playlist_unmix( mlt_playlist this, int clip )
1068 {
1069         int error = ( clip < 0 || clip >= this->count );
1070
1071         // Ensure that the clip request is actually a mix
1072         if ( error == 0 )
1073         {
1074                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1075                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1076                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL ||
1077                             this->list[ clip ]->preservation_hack;
1078         }
1079
1080         if ( error == 0 )
1081         {
1082                 playlist_entry *mix = this->list[ clip ];
1083                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1084                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1085                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1086                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1087                 int length = mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1088                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1089
1090                 if ( clip_a != NULL )
1091                 {
1092                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) + length );
1093                 }
1094                 else
1095                 {
1096                         mlt_producer cut = mlt_tractor_get_track( tractor, 0 );
1097                         mlt_playlist_insert( this, cut, clip, -1, -1 );
1098                         clip ++;
1099                 }
1100
1101                 if ( clip_b != NULL )
1102                 {
1103                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) - length, mlt_producer_get_out( clip_b ) );
1104                 }
1105                 else
1106                 {
1107                         mlt_producer cut = mlt_tractor_get_track( tractor, 1 );
1108                         mlt_playlist_insert( this, cut, clip + 1, -1, -1 );
1109                 }
1110
1111                 mlt_properties_set_data( properties, "mlt_mix", NULL, 0, NULL, NULL );
1112                 mlt_playlist_remove( this, clip );
1113                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1114                 mlt_playlist_virtual_refresh( this );
1115         }
1116         return error;
1117 }
1118
1119 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out )
1120 {
1121         int error = ( clip < 0 || clip >= this->count );
1122
1123         // Ensure that the clip request is actually a mix
1124         if ( error == 0 )
1125         {
1126                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1127                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1128                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL;
1129         }
1130
1131         if ( error == 0 )
1132         {
1133                 playlist_entry *mix = this->list[ clip ];
1134                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1135                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1136                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1137                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1138                 mlt_producer track_a = mlt_tractor_get_track( tractor, 0 );
1139                 mlt_producer track_b = mlt_tractor_get_track( tractor, 1 );
1140                 int length = out - in + 1;
1141                 int length_diff = length - mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1142                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1143
1144                 if ( clip_a != NULL )
1145                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) - length_diff );
1146
1147                 if ( clip_b != NULL )
1148                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) + length_diff, mlt_producer_get_out( clip_b ) );
1149
1150                 mlt_producer_set_in_and_out( track_a, mlt_producer_get_in( track_a ) - length_diff, mlt_producer_get_out( track_a ) );
1151                 mlt_producer_set_in_and_out( track_b, mlt_producer_get_in( track_b ), mlt_producer_get_out( track_b ) + length_diff );
1152                 mlt_producer_set_in_and_out( MLT_MULTITRACK_PRODUCER( mlt_tractor_multitrack( tractor ) ), in, out );
1153                 mlt_producer_set_in_and_out( MLT_TRACTOR_PRODUCER( tractor ), in, out );
1154                 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( mix->producer ), "length", out - in + 1 );
1155                 mlt_producer_set_in_and_out( mix->producer, in, out );
1156
1157                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1158                 mlt_playlist_virtual_refresh( this );
1159         }
1160         return error;
1161 }
1162
1163 /** Consolodate adjacent blank producers.
1164 */
1165
1166 void mlt_playlist_consolidate_blanks( mlt_playlist this, int keep_length )
1167 {
1168         if ( this != NULL )
1169         {
1170                 int i = 0;
1171                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1172
1173                 mlt_events_block( properties, properties );
1174                 for ( i = 1; i < this->count; i ++ )
1175                 {
1176                         playlist_entry *left = this->list[ i - 1 ];
1177                         playlist_entry *right = this->list[ i ];
1178
1179                         if ( mlt_producer_is_blank( left->producer ) && mlt_producer_is_blank( right->producer ) )
1180                         {
1181                                 mlt_playlist_resize_clip( this, i - 1, 0, left->frame_count + right->frame_count - 1 );
1182                                 mlt_playlist_remove( this, i -- );
1183                         }
1184                 }
1185
1186                 if ( !keep_length && this->count > 0 )
1187                 {
1188                         playlist_entry *last = this->list[ this->count - 1 ];
1189                         if ( mlt_producer_is_blank( last->producer ) )
1190                                 mlt_playlist_remove( this, this->count - 1 );
1191                 }
1192
1193                 mlt_events_unblock( properties, properties );
1194                 mlt_playlist_virtual_refresh( this );
1195         }
1196 }
1197
1198 /** Determine if the specified clip index is a blank.
1199 */
1200
1201 int mlt_playlist_is_blank( mlt_playlist this, int clip )
1202 {
1203         return this == NULL || mlt_producer_is_blank( mlt_playlist_get_clip( this, clip ) );
1204 }
1205
1206 /** Determine if the specified position is a blank.
1207 */
1208
1209 int mlt_playlist_is_blank_at( mlt_playlist this, mlt_position position )
1210 {
1211         return this == NULL || mlt_producer_is_blank( mlt_playlist_get_clip_at( this, position ) );
1212 }
1213
1214 /** Replace the specified clip with a blank and return the clip.
1215 */
1216
1217 mlt_producer mlt_playlist_replace_with_blank( mlt_playlist this, int clip )
1218 {
1219         mlt_producer producer = NULL;
1220         if ( !mlt_playlist_is_blank( this, clip ) )
1221         {
1222                 playlist_entry *entry = this->list[ clip ];
1223                 int in = entry->frame_in;
1224                 int out = entry->frame_out;
1225                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1226                 producer = entry->producer;
1227                 mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
1228                 mlt_events_block( properties, properties );
1229                 mlt_playlist_remove( this, clip );
1230                 mlt_playlist_blank( this, out - in );
1231                 mlt_playlist_move( this, this->count - 1, clip );
1232                 mlt_events_unblock( properties, properties );
1233                 mlt_playlist_virtual_refresh( this );
1234                 mlt_producer_set_in_and_out( producer, in, out );
1235         }
1236         return producer;
1237 }
1238
1239 void mlt_playlist_insert_blank( mlt_playlist this, int clip, int length )
1240 {
1241         if ( this != NULL && length >= 0 )
1242         {
1243                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1244                 mlt_events_block( properties, properties );
1245                 mlt_playlist_blank( this, length );
1246                 mlt_playlist_move( this, this->count - 1, clip );
1247                 mlt_events_unblock( properties, properties );
1248                 mlt_playlist_virtual_refresh( this );
1249         }
1250 }
1251
1252 void mlt_playlist_pad_blanks( mlt_playlist this, mlt_position position, int length, int find )
1253 {
1254         if ( this != NULL && length != 0 )
1255         {
1256                 int clip = mlt_playlist_get_clip_index_at( this, position );
1257                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1258                 mlt_events_block( properties, properties );
1259                 if ( find && clip < this->count && !mlt_playlist_is_blank( this, clip ) )
1260                         clip ++;
1261                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1262                 {
1263                         mlt_playlist_clip_info info;
1264                         mlt_playlist_get_clip_info( this, &info, clip );
1265                         if ( info.frame_out + length > info.frame_in )
1266                                 mlt_playlist_resize_clip( this, clip, info.frame_in, info.frame_out + length );
1267                         else
1268                                 mlt_playlist_remove( this, clip );
1269                 }
1270                 else if ( find && clip < this->count && length > 0  )
1271                 {
1272                         mlt_playlist_insert_blank( this, clip, length );
1273                 }
1274                 mlt_events_unblock( properties, properties );
1275                 mlt_playlist_virtual_refresh( this );
1276         }
1277 }
1278
1279 int mlt_playlist_insert_at( mlt_playlist this, mlt_position position, mlt_producer producer, int mode )
1280 {
1281         int ret = this == NULL || position < 0 || producer == NULL;
1282         if ( ret == 0 )
1283         {
1284                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1285                 int length = mlt_producer_get_playtime( producer );
1286                 int clip = mlt_playlist_get_clip_index_at( this, position );
1287                 mlt_playlist_clip_info info;
1288                 mlt_playlist_get_clip_info( this, &info, clip );
1289                 mlt_events_block( properties, this );
1290                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1291                 {
1292                         // Split and move to new clip if need be
1293                         if ( position != info.start && mlt_playlist_split( this, clip, position - info.start - 1 ) == 0 )
1294                                 mlt_playlist_get_clip_info( this, &info, ++ clip );
1295
1296                         // Split again if need be
1297                         if ( length < info.frame_count )
1298                                 mlt_playlist_split( this, clip, length - 1 );
1299
1300                         // Remove
1301                         mlt_playlist_remove( this, clip );
1302
1303                         // Insert
1304                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1305                         ret = clip;
1306                 }
1307                 else if ( clip < this->count )
1308                 {
1309                         if ( position > info.start + info.frame_count / 2 )
1310                                 clip ++;
1311                         if ( mode == 1 && clip < this->count && mlt_playlist_is_blank( this, clip ) )
1312                         {
1313                                 mlt_playlist_get_clip_info( this, &info, clip );
1314                                 if ( length < info.frame_count )
1315                                         mlt_playlist_split( this, clip, length );
1316                                 mlt_playlist_remove( this, clip );
1317                         }
1318                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1319                         ret = clip;
1320                 }
1321                 else
1322                 {
1323                         if ( mode == 1 ) {
1324                                 if ( position == info.start )
1325                                         mlt_playlist_remove( this, clip );
1326                                 else
1327                                         mlt_playlist_blank( this, position - mlt_properties_get_int( properties, "length" ) - 1 );
1328                         }
1329                         mlt_playlist_append( this, producer );
1330                         ret = this->count - 1;
1331                 }
1332                 mlt_events_unblock( properties, this );
1333                 mlt_playlist_virtual_refresh( this );
1334         }
1335         else
1336         {
1337                 ret = -1;
1338         }
1339         return ret;
1340 }
1341
1342 int mlt_playlist_clip_start( mlt_playlist this, int clip )
1343 {
1344         mlt_playlist_clip_info info;
1345         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1346                 return info.start;
1347         return clip < 0 ? 0 : mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
1348 }
1349
1350 int mlt_playlist_clip_length( mlt_playlist this, int clip )
1351 {
1352         mlt_playlist_clip_info info;
1353         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1354                 return info.frame_count;
1355         return 0;
1356 }
1357
1358 int mlt_playlist_blanks_from( mlt_playlist this, int clip, int bounded )
1359 {
1360         int count = 0;
1361         mlt_playlist_clip_info info;
1362         if ( this != NULL && clip < this->count )
1363         {
1364                 mlt_playlist_get_clip_info( this, &info, clip );
1365                 if ( mlt_playlist_is_blank( this, clip ) )
1366                         count += info.frame_count;
1367                 if ( bounded == 0 )
1368                         bounded = this->count;
1369                 for ( clip ++; clip < this->count && bounded >= 0; clip ++ )
1370                 {
1371                         mlt_playlist_get_clip_info( this, &info, clip );
1372                         if ( mlt_playlist_is_blank( this, clip ) )
1373                                 count += info.frame_count;
1374                         else
1375                                 bounded --;
1376                 }
1377         }
1378         return count;
1379 }
1380
1381 int mlt_playlist_remove_region( mlt_playlist this, mlt_position position, int length )
1382 {
1383         int index = mlt_playlist_get_clip_index_at( this, position );
1384         if ( index >= 0 && index < this->count )
1385         {
1386                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1387                 int clip_start = mlt_playlist_clip_start( this, index );
1388                 int clip_length = mlt_playlist_clip_length( this, index );
1389                 int list_length = mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
1390                 mlt_events_block( properties, this );
1391
1392                 if ( position + length > list_length )
1393                         length -= ( position + length - list_length );
1394
1395                 if ( clip_start < position )
1396                 {
1397                         mlt_playlist_split( this, index ++, position - clip_start );
1398                         clip_length -= position - clip_start;
1399                 }
1400
1401                 while( length > 0 )
1402                 {
1403                         if ( mlt_playlist_clip_length( this, index ) > length )
1404                                 mlt_playlist_split( this, index, length );
1405                         length -= mlt_playlist_clip_length( this, index );
1406                         mlt_playlist_remove( this, index );
1407                 }
1408
1409                 mlt_playlist_consolidate_blanks( this, 0 );
1410                 mlt_events_unblock( properties, this );
1411                 mlt_playlist_virtual_refresh( this );
1412
1413                 // Just to be sure, we'll get the clip index again...
1414                 index = mlt_playlist_get_clip_index_at( this, position );
1415         }
1416         return index;
1417 }
1418
1419 int mlt_playlist_move_region( mlt_playlist this, mlt_position position, int length, int new_position )
1420 {
1421         if ( this != NULL )
1422         {
1423         }
1424         return 0;
1425 }
1426
1427 /** Get the current frame.
1428 */
1429
1430 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
1431 {
1432         // Check that we have a producer
1433         if ( producer == NULL )
1434         {
1435                 *frame = NULL;
1436                 return -1;
1437         }
1438
1439         // Get this mlt_playlist
1440         mlt_playlist this = producer->child;
1441
1442         // Need to ensure the frame is deinterlaced when repeating 1 frame
1443         int progressive = 0;
1444
1445         // Get the real producer
1446         mlt_service real = mlt_playlist_virtual_seek( this, &progressive );
1447
1448         // Check that we have a producer
1449         if ( real == NULL )
1450         {
1451                 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
1452                 return 0;
1453         }
1454
1455         // Get the frame
1456         if ( !mlt_properties_get_int( MLT_SERVICE_PROPERTIES( real ), "meta.fx_cut" ) )
1457         {
1458                 mlt_service_get_frame( real, frame, index );
1459         }
1460         else
1461         {
1462                 mlt_producer parent = mlt_producer_cut_parent( ( mlt_producer )real );
1463                 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( parent ) );
1464                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame ), "fx_cut", 1 );
1465                 mlt_frame_push_service( *frame, NULL );
1466                 mlt_frame_push_audio( *frame, NULL );
1467                 mlt_service_apply_filters( MLT_PRODUCER_SERVICE( parent ), *frame, 0 );
1468                 mlt_service_apply_filters( real, *frame, 0 );
1469                 mlt_deque_pop_front( MLT_FRAME_IMAGE_STACK( *frame ) );
1470                 mlt_deque_pop_front( MLT_FRAME_AUDIO_STACK( *frame ) );
1471         }
1472
1473         // Check if we're at the end of the clip
1474         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
1475         if ( mlt_properties_get_int( properties, "end_of_clip" ) )
1476                 mlt_playlist_virtual_set_out( this );
1477
1478         // Set the consumer progressive property
1479         if ( progressive )
1480         {
1481                 mlt_properties_set_int( properties, "consumer_deinterlace", progressive );
1482                 mlt_properties_set_int( properties, "test_audio", 1 );
1483         }
1484
1485         // Check for notifier and call with appropriate argument
1486         mlt_properties playlist_properties = MLT_PRODUCER_PROPERTIES( producer );
1487         void ( *notifier )( void * ) = mlt_properties_get_data( playlist_properties, "notifier", NULL );
1488         if ( notifier != NULL )
1489         {
1490                 void *argument = mlt_properties_get_data( playlist_properties, "notifier_arg", NULL );
1491                 notifier( argument );
1492         }
1493
1494         // Update position on the frame we're creating
1495         mlt_frame_set_position( *frame, mlt_producer_frame( producer ) );
1496
1497         // Position ourselves on the next frame
1498         mlt_producer_prepare_next( producer );
1499
1500         return 0;
1501 }
1502
1503 /** Close the playlist.
1504 */
1505
1506 void mlt_playlist_close( mlt_playlist this )
1507 {
1508         if ( this != NULL && mlt_properties_dec_ref( MLT_PLAYLIST_PROPERTIES( this ) ) <= 0 )
1509         {
1510                 int i = 0;
1511                 this->parent.close = NULL;
1512                 for ( i = 0; i < this->count; i ++ )
1513                 {
1514                         mlt_event_close( this->list[ i ]->event );
1515                         mlt_producer_close( this->list[ i ]->producer );
1516                         free( this->list[ i ] );
1517                 }
1518                 mlt_producer_close( &this->blank );
1519                 mlt_producer_close( &this->parent );
1520                 free( this->list );
1521                 free( this );
1522         }
1523 }