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

   1 /*
   2  * mlt_playlist.c -- playlist service class
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "config.h"
  22
  23 #include "mlt_playlist.h"
  24 #include "mlt_tractor.h"
  25 #include "mlt_multitrack.h"
  26 #include "mlt_field.h"
  27 #include "mlt_frame.h"
  28 #include "mlt_transition.h"
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33
  34 /** Virtual playlist entry.
  35 */
  36
  37 struct playlist_entry_s
  38 {
  39         mlt_producer producer;
  40         mlt_position frame_in;
  41         mlt_position frame_out;
  42         mlt_position frame_count;
  43         int repeat;
  44         mlt_position producer_length;
  45         mlt_event event;
  46         int preservation_hack;
  47 };
  48
  49 /** Forward declarations
  50 */
  51
  52 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  53 static int mlt_playlist_unmix( mlt_playlist this, int clip );
  54 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out );
  55
  56 /** Constructor.
  57 */
  58
  59 mlt_playlist mlt_playlist_init( )
  60 {
  61         mlt_playlist this = calloc( sizeof( struct mlt_playlist_s ), 1 );
  62         if ( this != NULL )
  63         {
  64                 mlt_producer producer = &this->parent;
  65
  66                 // Construct the producer
  67                 mlt_producer_init( producer, this );
  68
  69                 // Override the producer get_frame
  70                 producer->get_frame = producer_get_frame;
  71
  72                 // Define the destructor
  73                 producer->close = ( mlt_destructor )mlt_playlist_close;
  74                 producer->close_object = this;
  75
  76                 // Initialise blank
  77                 mlt_producer_init( &this->blank, NULL );
  78                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( &this->blank ), "mlt_service", "blank" );
  79                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( &this->blank ), "resource", "blank" );
  80
  81                 // Indicate that this producer is a playlist
  82                 mlt_properties_set_data( MLT_PLAYLIST_PROPERTIES( this ), "playlist", this, 0, NULL, NULL );
  83
  84                 // Specify the eof condition
  85                 mlt_properties_set( MLT_PLAYLIST_PROPERTIES( this ), "eof", "pause" );
  86                 mlt_properties_set( MLT_PLAYLIST_PROPERTIES( this ), "resource", "<playlist>" );
  87                 mlt_properties_set( MLT_PLAYLIST_PROPERTIES( this ), "mlt_type", "mlt_producer" );
  88                 mlt_properties_set_position( MLT_PLAYLIST_PROPERTIES( this ), "in", 0 );
  89                 mlt_properties_set_position( MLT_PLAYLIST_PROPERTIES( this ), "out", -1 );
  90                 mlt_properties_set_position( MLT_PLAYLIST_PROPERTIES( this ), "length", 0 );
  91
  92                 this->size = 10;
  93                 this->list = malloc( this->size * sizeof( playlist_entry * ) );
  94         }
  95
  96         return this;
  97 }
  98
  99 /** Get the producer associated to this playlist.
 100 */
 101
 102 mlt_producer mlt_playlist_producer( mlt_playlist this )
 103 {
 104         return this != NULL ? &this->parent : NULL;
 105 }
 106
 107 /** Get the service associated to this playlist.
 108 */
 109
 110 mlt_service mlt_playlist_service( mlt_playlist this )
 111 {
 112         return MLT_PRODUCER_SERVICE( &this->parent );
 113 }
 114
 115 /** Get the propertues associated to this playlist.
 116 */
 117
 118 mlt_properties mlt_playlist_properties( mlt_playlist this )
 119 {
 120         return MLT_PRODUCER_PROPERTIES( &this->parent );
 121 }
 122
 123 /** Refresh the playlist after a clip has been changed.
 124 */
 125
 126 static int mlt_playlist_virtual_refresh( mlt_playlist this )
 127 {
 128         // Obtain the properties
 129         mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
 130
 131         // Get the fps of the first producer
 132         double fps = mlt_properties_get_double( properties, "first_fps" );
 133         int i = 0;
 134         mlt_position frame_count = 0;
 135
 136         for ( i = 0; i < this->count; i ++ )
 137         {
 138                 // Get the producer
 139                 mlt_producer producer = this->list[ i ]->producer;
 140                 int current_length = mlt_producer_get_out( producer ) - mlt_producer_get_in( producer ) + 1;
 141
 142                 // If fps is 0
 143                 if ( fps == 0 )
 144                 {
 145                         // Inherit it from the producer
 146                         fps = mlt_producer_get_fps( producer );
 147                 }
 148                 else if ( fps != mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( producer ), "fps" ) )
 149                 {
 150                         // Generate a warning for now - the following attempt to fix may fail
 151                         fprintf( stderr, "Warning: fps mismatch on playlist producer %d\n", this->count );
 152
 153                         // It should be safe to impose fps on an image producer, but not necessarily safe for video
 154                         mlt_properties_set_double( MLT_PRODUCER_PROPERTIES( producer ), "fps", fps );
 155                 }
 156
 157                 // Check if the length of the producer has changed
 158                 if ( this->list[ i ]->frame_in != mlt_producer_get_in( producer ) ||
 159                          this->list[ i ]->frame_out != mlt_producer_get_out( producer ) )
 160                 {
 161                         // This clip should be removed...
 162                         if ( current_length < 1 )
 163                         {
 164                                 this->list[ i ]->frame_in = 0;
 165                                 this->list[ i ]->frame_out = -1;
 166                                 this->list[ i ]->frame_count = 0;
 167                         }
 168                         else
 169                         {
 170                                 this->list[ i ]->frame_in = mlt_producer_get_in( producer );
 171                                 this->list[ i ]->frame_out = mlt_producer_get_out( producer );
 172                                 this->list[ i ]->frame_count = current_length;
 173                         }
 174
 175                         // Update the producer_length
 176                         this->list[ i ]->producer_length = current_length;
 177                 }
 178
 179                 // Calculate the frame_count
 180                 this->list[ i ]->frame_count = ( this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1 ) * this->list[ i ]->repeat;
 181
 182                 // Update the frame_count for this clip
 183                 frame_count += this->list[ i ]->frame_count;
 184         }
 185
 186         // Refresh all properties
 187         mlt_properties_set_double( properties, "first_fps", fps );
 188         mlt_properties_set_double( properties, "fps", fps == 0 ? 25 : fps );
 189         mlt_events_block( properties, properties );
 190         mlt_properties_set_position( properties, "length", frame_count );
 191         mlt_events_unblock( properties, properties );
 192         mlt_properties_set_position( properties, "out", frame_count - 1 );
 193
 194         return 0;
 195 }
 196
 197 /** Listener for producers on the playlist.
 198 */
 199
 200 static void mlt_playlist_listener( mlt_producer producer, mlt_playlist this )
 201 {
 202         mlt_playlist_virtual_refresh( this );
 203 }
 204
 205 /** Append to the virtual playlist.
 206 */
 207
 208 static int mlt_playlist_virtual_append( mlt_playlist this, mlt_producer source, mlt_position in, mlt_position out )
 209 {
 210         mlt_producer producer = NULL;
 211         mlt_properties properties = NULL;
 212         mlt_properties parent = NULL;
 213
 214         // If we have a cut, then use the in/out points from the cut
 215         if ( mlt_producer_is_blank( source )  )
 216         {
 217                 // Make sure the blank is long enough to accomodate the length specified
 218                 if ( out - in + 1 > mlt_producer_get_length( &this->blank ) )
 219                 {
 220                         mlt_properties blank_props = MLT_PRODUCER_PROPERTIES( &this->blank );
 221                         mlt_events_block( blank_props, blank_props );
 222                         mlt_producer_set_in_and_out( &this->blank, in, out );
 223                         mlt_events_unblock( blank_props, blank_props );
 224                 }
 225
 226                 // Now make sure the cut comes from this this->blank
 227                 if ( source == NULL )
 228                 {
 229                         producer = mlt_producer_cut( &this->blank, in, out );
 230                 }
 231                 else if ( !mlt_producer_is_cut( source ) || mlt_producer_cut_parent( source ) != &this->blank )
 232                 {
 233                         producer = mlt_producer_cut( &this->blank, in, out );
 234                 }
 235                 else
 236                 {
 237                         producer = source;
 238                         mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
 239                 }
 240
 241                 properties = MLT_PRODUCER_PROPERTIES( producer );
 242         }
 243         else if ( mlt_producer_is_cut( source ) )
 244         {
 245                 producer = source;
 246                 if ( in == -1 )
 247                         in = mlt_producer_get_in( producer );
 248                 if ( out == -1 || out > mlt_producer_get_out( producer ) )
 249                         out = mlt_producer_get_out( producer );
 250                 properties = MLT_PRODUCER_PROPERTIES( producer );
 251                 mlt_properties_inc_ref( properties );
 252         }
 253         else
 254         {
 255                 producer = mlt_producer_cut( source, in, out );
 256                 if ( in == -1 || in < mlt_producer_get_in( producer ) )
 257                         in = mlt_producer_get_in( producer );
 258                 if ( out == -1 || out > mlt_producer_get_out( producer ) )
 259                         out = mlt_producer_get_out( producer );
 260                 properties = MLT_PRODUCER_PROPERTIES( producer );
 261         }
 262
 263         // Fetch the cuts parent properties
 264         parent = MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( producer ) );
 265
 266         // Check that we have room
 267         if ( this->count >= this->size )
 268         {
 269                 int i;
 270                 this->list = realloc( this->list, ( this->size + 10 ) * sizeof( playlist_entry * ) );
 271                 for ( i = this->size; i < this->size + 10; i ++ ) this->list[ i ] = NULL;
 272                 this->size += 10;
 273         }
 274
 275         // Create the entry
 276         this->list[ this->count ] = calloc( sizeof( playlist_entry ), 1 );
 277         if ( this->list[ this->count ] != NULL )
 278         {
 279                 this->list[ this->count ]->producer = producer;
 280                 this->list[ this->count ]->frame_in = in;
 281                 this->list[ this->count ]->frame_out = out;
 282                 this->list[ this->count ]->frame_count = out - in + 1;
 283                 this->list[ this->count ]->repeat = 1;
 284                 this->list[ this->count ]->producer_length = mlt_producer_get_out( producer ) - mlt_producer_get_in( producer ) + 1;
 285                 this->list[ this->count ]->event = mlt_events_listen( parent, this, "producer-changed", ( mlt_listener )mlt_playlist_listener );
 286                 mlt_event_inc_ref( this->list[ this->count ]->event );
 287                 mlt_properties_set( properties, "eof", "pause" );
 288                 mlt_producer_set_speed( producer, 0 );
 289                 this->count ++;
 290         }
 291
 292         return mlt_playlist_virtual_refresh( this );
 293 }
 294
 295 static mlt_producer mlt_playlist_locate( mlt_playlist this, mlt_position *position, int *clip, int *total )
 296 {
 297         // Default producer to NULL
 298         mlt_producer producer = NULL;
 299
 300         // Loop for each producer until found
 301         for ( *clip = 0; *clip < this->count; *clip += 1 )
 302         {
 303                 // Increment the total
 304                 *total += this->list[ *clip ]->frame_count;
 305
 306                 // Check if the position indicates that we have found the clip
 307                 // Note that 0 length clips get skipped automatically
 308                 if ( *position < this->list[ *clip ]->frame_count )
 309                 {
 310                         // Found it, now break
 311                         producer = this->list[ *clip ]->producer;
 312                         break;
 313                 }
 314                 else
 315                 {
 316                         // Decrement position by length of this entry
 317                         *position -= this->list[ *clip ]->frame_count;
 318                 }
 319         }
 320
 321         return producer;
 322 }
 323
 324 /** Seek in the virtual playlist.
 325 */
 326
 327 static mlt_service mlt_playlist_virtual_seek( mlt_playlist this, int *progressive )
 328 {
 329         // Map playlist position to real producer in virtual playlist
 330         mlt_position position = mlt_producer_frame( &this->parent );
 331
 332         // Keep the original position since we change it while iterating through the list
 333         mlt_position original = position;
 334
 335         // Clip index and total
 336         int i = 0;
 337         int total = 0;
 338
 339         // Locate the producer for the position
 340         mlt_producer producer = mlt_playlist_locate( this, &position, &i, &total );
 341
 342         // Get the properties
 343         mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
 344
 345         // Get the eof handling
 346         char *eof = mlt_properties_get( properties, "eof" );
 347
 348         // Seek in real producer to relative position
 349         if ( producer != NULL )
 350         {
 351                 int count = this->list[ i ]->frame_count / this->list[ i ]->repeat;
 352                 *progressive = count == 1;
 353                 mlt_producer_seek( producer, position % count );
 354         }
 355         else if ( !strcmp( eof, "pause" ) && total > 0 )
 356         {
 357                 playlist_entry *entry = this->list[ this->count - 1 ];
 358                 int count = entry->frame_count / entry->repeat;
 359                 mlt_producer this_producer = MLT_PLAYLIST_PRODUCER( this );
 360                 mlt_producer_seek( this_producer, original - 1 );
 361                 producer = entry->producer;
 362                 mlt_producer_seek( producer, entry->frame_out % count );
 363                 mlt_producer_set_speed( this_producer, 0 );
 364                 mlt_producer_set_speed( producer, 0 );
 365                 *progressive = count == 1;
 366         }
 367         else if ( !strcmp( eof, "loop" ) && total > 0 )
 368         {
 369                 playlist_entry *entry = this->list[ 0 ];
 370                 mlt_producer this_producer = MLT_PLAYLIST_PRODUCER( this );
 371                 mlt_producer_seek( this_producer, 0 );
 372                 producer = entry->producer;
 373                 mlt_producer_seek( producer, 0 );
 374         }
 375         else
 376         {
 377                 producer = &this->blank;
 378         }
 379
 380         return MLT_PRODUCER_SERVICE( producer );
 381 }
 382
 383 /** Invoked when a producer indicates that it has prematurely reached its end.
 384 */
 385
 386 static mlt_producer mlt_playlist_virtual_set_out( mlt_playlist this )
 387 {
 388         // Default producer to blank
 389         mlt_producer producer = &this->blank;
 390
 391         // Map playlist position to real producer in virtual playlist
 392         mlt_position position = mlt_producer_frame( &this->parent );
 393
 394         // Loop through the virtual playlist
 395         int i = 0;
 396
 397         for ( i = 0; i < this->count; i ++ )
 398         {
 399                 if ( position < this->list[ i ]->frame_count )
 400                 {
 401                         // Found it, now break
 402                         producer = this->list[ i ]->producer;
 403                         break;
 404                 }
 405                 else
 406                 {
 407                         // Decrement position by length of this entry
 408                         position -= this->list[ i ]->frame_count;
 409                 }
 410         }
 411
 412         // Seek in real producer to relative position
 413         if ( i < this->count && this->list[ i ]->frame_out != position )
 414         {
 415                 // Update the frame_count for the changed clip (hmmm)
 416                 this->list[ i ]->frame_out = position;
 417                 this->list[ i ]->frame_count = this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1;
 418
 419                 // Refresh the playlist
 420                 mlt_playlist_virtual_refresh( this );
 421         }
 422
 423         return producer;
 424 }
 425
 426 /** Obtain the current clips index.
 427 */
 428
 429 int mlt_playlist_current_clip( mlt_playlist this )
 430 {
 431         // Map playlist position to real producer in virtual playlist
 432         mlt_position position = mlt_producer_frame( &this->parent );
 433
 434         // Loop through the virtual playlist
 435         int i = 0;
 436
 437         for ( i = 0; i < this->count; i ++ )
 438         {
 439                 if ( position < this->list[ i ]->frame_count )
 440                 {
 441                         // Found it, now break
 442                         break;
 443                 }
 444                 else
 445                 {
 446                         // Decrement position by length of this entry
 447                         position -= this->list[ i ]->frame_count;
 448                 }
 449         }
 450
 451         return i;
 452 }
 453
 454 /** Obtain the current clips producer.
 455 */
 456
 457 mlt_producer mlt_playlist_current( mlt_playlist this )
 458 {
 459         int i = mlt_playlist_current_clip( this );
 460         if ( i < this->count )
 461                 return this->list[ i ]->producer;
 462         else
 463                 return &this->blank;
 464 }
 465
 466 /** Get the position which corresponds to the start of the next clip.
 467 */
 468
 469 mlt_position mlt_playlist_clip( mlt_playlist this, mlt_whence whence, int index )
 470 {
 471         mlt_position position = 0;
 472         int absolute_clip = index;
 473         int i = 0;
 474
 475         // Determine the absolute clip
 476         switch ( whence )
 477         {
 478                 case mlt_whence_relative_start:
 479                         absolute_clip = index;
 480                         break;
 481
 482                 case mlt_whence_relative_current:
 483                         absolute_clip = mlt_playlist_current_clip( this ) + index;
 484                         break;
 485
 486                 case mlt_whence_relative_end:
 487                         absolute_clip = this->count - index;
 488                         break;
 489         }
 490
 491         // Check that we're in a valid range
 492         if ( absolute_clip < 0 )
 493                 absolute_clip = 0;
 494         else if ( absolute_clip > this->count )
 495                 absolute_clip = this->count;
 496
 497         // Now determine the position
 498         for ( i = 0; i < absolute_clip; i ++ )
 499                 position += this->list[ i ]->frame_count;
 500
 501         return position;
 502 }
 503
 504 /** Get all the info about the clip specified.
 505 */
 506
 507 int mlt_playlist_get_clip_info( mlt_playlist this, mlt_playlist_clip_info *info, int index )
 508 {
 509         int error = index < 0 || index >= this->count;
 510         memset( info, 0, sizeof( mlt_playlist_clip_info ) );
 511         if ( !error )
 512         {
 513                 mlt_producer producer = mlt_producer_cut_parent( this->list[ index ]->producer );
 514                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
 515                 info->clip = index;
 516                 info->producer = producer;
 517                 info->cut = this->list[ index ]->producer;
 518                 info->start = mlt_playlist_clip( this, mlt_whence_relative_start, index );
 519                 info->resource = mlt_properties_get( properties, "resource" );
 520                 info->frame_in = this->list[ index ]->frame_in;
 521                 info->frame_out = this->list[ index ]->frame_out;
 522                 info->frame_count = this->list[ index ]->frame_count;
 523                 info->repeat = this->list[ index ]->repeat;
 524                 info->length = mlt_producer_get_length( producer );
 525                 info->fps = mlt_producer_get_fps( producer );
 526         }
 527
 528         return error;
 529 }
 530
 531 /** Get number of clips in the playlist.
 532 */
 533
 534 int mlt_playlist_count( mlt_playlist this )
 535 {
 536         return this->count;
 537 }
 538
 539 /** Clear the playlist.
 540 */
 541
 542 int mlt_playlist_clear( mlt_playlist this )
 543 {
 544         int i;
 545         for ( i = 0; i < this->count; i ++ )
 546         {
 547                 mlt_event_close( this->list[ i ]->event );
 548                 mlt_producer_close( this->list[ i ]->producer );
 549         }
 550         this->count = 0;
 551         mlt_properties_set_double( MLT_PLAYLIST_PROPERTIES( this ), "first_fps", 0 );
 552         return mlt_playlist_virtual_refresh( this );
 553 }
 554
 555 /** Append a producer to the playlist.
 556 */
 557
 558 int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
 559 {
 560         // Append to virtual list
 561         return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) - 1 );
 562 }
 563
 564 /** Append a producer to the playlist with in/out points.
 565 */
 566
 567 int mlt_playlist_append_io( mlt_playlist this, mlt_producer producer, mlt_position in, mlt_position out )
 568 {
 569         // Append to virtual list
 570         if ( in != -1 && out != -1 )
 571                 return mlt_playlist_virtual_append( this, producer, in, out );
 572         else
 573                 return mlt_playlist_append( this, producer );
 574 }
 575
 576 /** Append a blank to the playlist of a given length.
 577 */
 578
 579 int mlt_playlist_blank( mlt_playlist this, mlt_position length )
 580 {
 581         // Append to the virtual list
 582         return mlt_playlist_virtual_append( this, &this->blank, 0, length );
 583 }
 584
 585 /** Insert a producer into the playlist.
 586 */
 587
 588 int mlt_playlist_insert( mlt_playlist this, mlt_producer producer, int where, mlt_position in, mlt_position out )
 589 {
 590         // Append to end
 591         mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 592         mlt_playlist_append_io( this, producer, in, out );
 593
 594         // Move to the position specified
 595         mlt_playlist_move( this, this->count - 1, where );
 596         mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 597
 598         return mlt_playlist_virtual_refresh( this );
 599 }
 600
 601 /** Remove an entry in the playlist.
 602 */
 603
 604 int mlt_playlist_remove( mlt_playlist this, int where )
 605 {
 606         int error = where < 0 || where >= this->count;
 607         if ( error == 0 && mlt_playlist_unmix( this, where ) != 0 )
 608         {
 609                 // We need to know the current clip and the position within the playlist
 610                 int current = mlt_playlist_current_clip( this );
 611                 mlt_position position = mlt_producer_position( MLT_PLAYLIST_PRODUCER( this ) );
 612
 613                 // We need all the details about the clip we're removing
 614                 mlt_playlist_clip_info where_info;
 615                 playlist_entry *entry = this->list[ where ];
 616                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( entry->producer );
 617
 618                 // Loop variable
 619                 int i = 0;
 620
 621                 // Get the clip info
 622                 mlt_playlist_get_clip_info( this, &where_info, where );
 623
 624                 // Make sure the clip to be removed is valid and correct if necessary
 625                 if ( where < 0 )
 626                         where = 0;
 627                 if ( where >= this->count )
 628                         where = this->count - 1;
 629
 630                 // Reorganise the list
 631                 for ( i = where + 1; i < this->count; i ++ )
 632                         this->list[ i - 1 ] = this->list[ i ];
 633                 this->count --;
 634
 635                 if ( entry->preservation_hack == 0 )
 636                 {
 637                         // Decouple from mix_in/out if necessary
 638                         if ( mlt_properties_get_data( properties, "mix_in", NULL ) != NULL )
 639                         {
 640                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_in", NULL );
 641                                 mlt_properties_set_data( mix, "mix_out", NULL, 0, NULL, NULL );
 642                         }
 643                         if ( mlt_properties_get_data( properties, "mix_out", NULL ) != NULL )
 644                         {
 645                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_out", NULL );
 646                                 mlt_properties_set_data( mix, "mix_in", NULL, 0, NULL, NULL );
 647                         }
 648
 649                         if ( mlt_properties_ref_count( MLT_PRODUCER_PROPERTIES( entry->producer ) ) == 1 )
 650                                 mlt_producer_clear( entry->producer );
 651                 }
 652
 653                 // Close the producer associated to the clip info
 654                 mlt_event_close( entry->event );
 655                 mlt_producer_close( entry->producer );
 656
 657                 // Correct position
 658                 if ( where == current )
 659                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), where_info.start );
 660                 else if ( where < current && this->count > 0 )
 661                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), position - where_info.frame_count );
 662                 else if ( this->count == 0 )
 663                         mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), 0 );
 664
 665                 // Free the entry
 666                 free( entry );
 667
 668                 // Refresh the playlist
 669                 mlt_playlist_virtual_refresh( this );
 670         }
 671
 672         return error;
 673 }
 674
 675 /** Move an entry in the playlist.
 676 */
 677
 678 int mlt_playlist_move( mlt_playlist this, int src, int dest )
 679 {
 680         int i;
 681
 682         /* We need to ensure that the requested indexes are valid and correct it as necessary */
 683         if ( src < 0 )
 684                 src = 0;
 685         if ( src >= this->count )
 686                 src = this->count - 1;
 687
 688         if ( dest < 0 )
 689                 dest = 0;
 690         if ( dest >= this->count )
 691                 dest = this->count - 1;
 692
 693         if ( src != dest && this->count > 1 )
 694         {
 695                 int current = mlt_playlist_current_clip( this );
 696                 mlt_position position = mlt_producer_position( MLT_PLAYLIST_PRODUCER( this ) );
 697                 playlist_entry *src_entry = NULL;
 698
 699                 // We need all the details about the current clip
 700                 mlt_playlist_clip_info current_info;
 701
 702                 mlt_playlist_get_clip_info( this, &current_info, current );
 703                 position -= current_info.start;
 704
 705                 if ( current == src )
 706                         current = dest;
 707                 else if ( current > src && current < dest )
 708                         current ++;
 709                 else if ( current == dest )
 710                         current = src;
 711
 712                 src_entry = this->list[ src ];
 713                 if ( src > dest )
 714                 {
 715                         for ( i = src; i > dest; i -- )
 716                                 this->list[ i ] = this->list[ i - 1 ];
 717                 }
 718                 else
 719                 {
 720                         for ( i = src; i < dest; i ++ )
 721                                 this->list[ i ] = this->list[ i + 1 ];
 722                 }
 723                 this->list[ dest ] = src_entry;
 724
 725                 mlt_playlist_get_clip_info( this, &current_info, current );
 726                 mlt_producer_seek( MLT_PLAYLIST_PRODUCER( this ), current_info.start + position );
 727                 mlt_playlist_virtual_refresh( this );
 728         }
 729
 730         return 0;
 731 }
 732
 733 /** Repeat the specified clip n times.
 734 */
 735
 736 int mlt_playlist_repeat_clip( mlt_playlist this, int clip, int repeat )
 737 {
 738         int error = repeat < 1 || clip < 0 || clip >= this->count;
 739         if ( error == 0 )
 740         {
 741                 playlist_entry *entry = this->list[ clip ];
 742                 entry->repeat = repeat;
 743                 mlt_playlist_virtual_refresh( this );
 744         }
 745         return error;
 746 }
 747
 748 /** Resize the specified clip.
 749 */
 750
 751 int mlt_playlist_resize_clip( mlt_playlist this, int clip, mlt_position in, mlt_position out )
 752 {
 753         int error = clip < 0 || clip >= this->count;
 754         if ( error == 0 && mlt_playlist_resize_mix( this, clip, in, out ) != 0 )
 755         {
 756                 playlist_entry *entry = this->list[ clip ];
 757                 mlt_producer producer = entry->producer;
 758
 759                 if ( mlt_producer_is_blank( producer ) )
 760                 {
 761                         // Make sure the blank is long enough to accomodate the length specified
 762                         if ( out - in + 1 > mlt_producer_get_length( &this->blank ) )
 763                         {
 764                                 mlt_properties blank_props = MLT_PRODUCER_PROPERTIES( &this->blank );
 765                                 mlt_events_block( blank_props, blank_props );
 766                                 mlt_producer_set_in_and_out( &this->blank, in, out );
 767                                 mlt_events_unblock( blank_props, blank_props );
 768                         }
 769                 }
 770
 771                 if ( in <= -1 )
 772                         in = 0;
 773                 if ( out <= -1 || out >= mlt_producer_get_length( producer ) )
 774                         out = mlt_producer_get_length( producer ) - 1;
 775
 776                 if ( out < in )
 777                 {
 778                         mlt_position t = in;
 779                         in = out;
 780                         out = t;
 781                 }
 782
 783                 mlt_producer_set_in_and_out( producer, in, out );
 784         }
 785         return error;
 786 }
 787
 788 /** Split a clip on the playlist at the given position.
 789 */
 790
 791 int mlt_playlist_split( mlt_playlist this, int clip, mlt_position position )
 792 {
 793         int error = clip < 0 || clip >= this->count;
 794         if ( error == 0 )
 795         {
 796                 playlist_entry *entry = this->list[ clip ];
 797                 position = position < 0 ? entry->frame_count + position - 1 : position;
 798                 if ( position >= 0 && position <= entry->frame_count )
 799                 {
 800                         int in = entry->frame_in;
 801                         int out = entry->frame_out;
 802                         mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 803                         mlt_playlist_resize_clip( this, clip, in, in + position );
 804                         if ( !mlt_producer_is_blank( entry->producer ) )
 805                         {
 806                                 mlt_producer split = mlt_producer_cut( entry->producer, in + position + 1, out );
 807                                 mlt_playlist_insert( this, split, clip + 1, 0, -1 );
 808                                 mlt_producer_close( split );
 809                         }
 810                         else
 811                         {
 812                                 mlt_playlist_insert( this, &this->blank, clip + 1, 0, out - position - 1 );
 813                         }
 814                         mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 815                         mlt_playlist_virtual_refresh( this );
 816                 }
 817                 else
 818                 {
 819                         error = 1;
 820                 }
 821         }
 822         return error;
 823 }
 824
 825 /** Join 1 or more consecutive clips.
 826 */
 827
 828 int mlt_playlist_join( mlt_playlist this, int clip, int count, int merge )
 829 {
 830         int error = clip < 0 || ( clip ) >= this->count;
 831         if ( error == 0 )
 832         {
 833                 int i = clip;
 834                 mlt_playlist new_clip = mlt_playlist_init( );
 835                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 836                 if ( clip + count >= this->count )
 837                         count = this->count - clip;
 838                 for ( i = 0; i <= count; i ++ )
 839                 {
 840                         playlist_entry *entry = this->list[ clip ];
 841                         mlt_playlist_append( new_clip, entry->producer );
 842                         mlt_playlist_repeat_clip( new_clip, i, entry->repeat );
 843                         entry->preservation_hack = 1;
 844                         mlt_playlist_remove( this, clip );
 845                 }
 846                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 847                 mlt_playlist_insert( this, MLT_PLAYLIST_PRODUCER( new_clip ), clip, 0, -1 );
 848                 mlt_playlist_close( new_clip );
 849         }
 850         return error;
 851 }
 852
 853 /** Mix consecutive clips for a specified length and apply transition if specified.
 854 */
 855
 856 int mlt_playlist_mix( mlt_playlist this, int clip, int length, mlt_transition transition )
 857 {
 858         int error = ( clip < 0 || clip + 1 >= this->count );
 859         if ( error == 0 )
 860         {
 861                 playlist_entry *clip_a = this->list[ clip ];
 862                 playlist_entry *clip_b = this->list[ clip + 1 ];
 863                 mlt_producer track_a = NULL;
 864                 mlt_producer track_b = NULL;
 865                 mlt_tractor tractor = mlt_tractor_new( );
 866                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 867
 868                 // Check length is valid for both clips and resize if necessary.
 869                 int max_size = clip_a->frame_count > clip_b->frame_count ? clip_a->frame_count : clip_b->frame_count;
 870                 length = length > max_size ? max_size : length;
 871
 872                 // Create the a and b tracks/cuts if necessary - note that no cuts are required if the length matches
 873                 if ( length != clip_a->frame_count )
 874                         track_a = mlt_producer_cut( clip_a->producer, clip_a->frame_out - length + 1, clip_a->frame_out );
 875                 else
 876                         track_a = clip_a->producer;
 877
 878                 if ( length != clip_b->frame_count )
 879                         track_b = mlt_producer_cut( clip_b->producer, clip_b->frame_in, clip_b->frame_in + length - 1 );
 880                 else
 881                         track_b = clip_b->producer;
 882
 883                 // Set the tracks on the tractor
 884                 mlt_tractor_set_track( tractor, track_a, 0 );
 885                 mlt_tractor_set_track( tractor, track_b, 1 );
 886
 887                 // Insert the mix object into the playlist
 888                 mlt_playlist_insert( this, MLT_TRACTOR_PRODUCER( tractor ), clip + 1, -1, -1 );
 889                 mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mlt_mix", tractor, 0, NULL, NULL );
 890
 891                 // Attach the transition
 892                 if ( transition != NULL )
 893                 {
 894                         mlt_field field = mlt_tractor_field( tractor );
 895                         mlt_field_plant_transition( field, transition, 0, 1 );
 896                         mlt_transition_set_in_and_out( transition, 0, length - 1 );
 897                 }
 898
 899                 // Close our references to the tracks if we created new cuts above (the tracks can still be used here)
 900                 if ( track_a != clip_a->producer )
 901                         mlt_producer_close( track_a );
 902                 if ( track_b != clip_b->producer )
 903                         mlt_producer_close( track_b );
 904
 905                 // Check if we have anything left on the right hand clip
 906                 if ( track_b == clip_b->producer )
 907                 {
 908                         clip_b->preservation_hack = 1;
 909                         mlt_playlist_remove( this, clip + 2 );
 910                 }
 911                 else if ( clip_b->frame_out - clip_b->frame_in > length )
 912                 {
 913                         mlt_playlist_resize_clip( this, clip + 2, clip_b->frame_in + length, clip_b->frame_out );
 914                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_b->producer ), "mix_in", tractor, 0, NULL, NULL );
 915                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_out", clip_b->producer, 0, NULL, NULL );
 916                 }
 917                 else
 918                 {
 919                         mlt_producer_clear( clip_b->producer );
 920                         mlt_playlist_remove( this, clip + 2 );
 921                 }
 922
 923                 // Check if we have anything left on the left hand clip
 924                 if ( track_a == clip_a->producer )
 925                 {
 926                         clip_a->preservation_hack = 1;
 927                         mlt_playlist_remove( this, clip );
 928                 }
 929                 else if ( clip_a->frame_out - clip_a->frame_in > length )
 930                 {
 931                         mlt_playlist_resize_clip( this, clip, clip_a->frame_in, clip_a->frame_out - length );
 932                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_a->producer ), "mix_out", tractor, 0, NULL, NULL );
 933                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_in", clip_a->producer, 0, NULL, NULL );
 934                 }
 935                 else
 936                 {
 937                         mlt_producer_clear( clip_a->producer );
 938                         mlt_playlist_remove( this, clip );
 939                 }
 940
 941                 // Unblock and force a fire off of change events to listeners
 942                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 943                 mlt_playlist_virtual_refresh( this );
 944                 mlt_tractor_close( tractor );
 945         }
 946         return error;
 947 }
 948
 949 /** Add a transition to an existing mix.
 950 */
 951
 952 int mlt_playlist_mix_add( mlt_playlist this, int clip, mlt_transition transition )
 953 {
 954         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
 955         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
 956         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
 957         int error = transition == NULL || tractor == NULL;
 958         if ( error == 0 )
 959         {
 960                 mlt_field field = mlt_tractor_field( tractor );
 961                 mlt_field_plant_transition( field, transition, 0, 1 );
 962                 mlt_transition_set_in_and_out( transition, 0, this->list[ clip ]->frame_count - 1 );
 963         }
 964         return error;
 965 }
 966
 967 /** Return the clip at the clip index.
 968 */
 969
 970 mlt_producer mlt_playlist_get_clip( mlt_playlist this, int clip )
 971 {
 972         if ( clip >= 0 && clip < this->count )
 973                 return this->list[ clip ]->producer;
 974         return NULL;
 975 }
 976
 977 /** Return the clip at the specified position.
 978 */
 979
 980 mlt_producer mlt_playlist_get_clip_at( mlt_playlist this, int position )
 981 {
 982         int index = 0, total = 0;
 983         return mlt_playlist_locate( this, &position, &index, &total );
 984 }
 985
 986 /** Return the clip index of the specified position.
 987 */
 988
 989 int mlt_playlist_get_clip_index_at( mlt_playlist this, int position )
 990 {
 991         int index = 0, total = 0;
 992         mlt_playlist_locate( this, &position, &index, &total );
 993         return index;
 994 }
 995
 996 /** Determine if the clip is a mix.
 997 */
 998
 999 int mlt_playlist_clip_is_mix( mlt_playlist this, int clip )
1000 {
1001         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
1002         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
1003         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
1004         return tractor != NULL;
1005 }
1006
1007 /** Remove a mixed clip - ensure that the cuts included in the mix find their way
1008         back correctly on to the playlist.
1009 */
1010
1011 static int mlt_playlist_unmix( mlt_playlist this, int clip )
1012 {
1013         int error = ( clip < 0 || clip >= this->count );
1014
1015         // Ensure that the clip request is actually a mix
1016         if ( error == 0 )
1017         {
1018                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1019                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1020                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL ||
1021                             this->list[ clip ]->preservation_hack;
1022         }
1023
1024         if ( error == 0 )
1025         {
1026                 playlist_entry *mix = this->list[ clip ];
1027                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1028                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1029                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1030                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1031                 int length = mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1032                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1033
1034                 if ( clip_a != NULL )
1035                 {
1036                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) + length );
1037                 }
1038                 else
1039                 {
1040                         mlt_producer cut = mlt_tractor_get_track( tractor, 0 );
1041                         mlt_playlist_insert( this, cut, clip, -1, -1 );
1042                         clip ++;
1043                 }
1044
1045                 if ( clip_b != NULL )
1046                 {
1047                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) - length, mlt_producer_get_out( clip_b ) );
1048                 }
1049                 else
1050                 {
1051                         mlt_producer cut = mlt_tractor_get_track( tractor, 1 );
1052                         mlt_playlist_insert( this, cut, clip + 1, -1, -1 );
1053                 }
1054
1055                 mlt_properties_set_data( properties, "mlt_mix", NULL, 0, NULL, NULL );
1056                 mlt_playlist_remove( this, clip );
1057                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1058                 mlt_playlist_virtual_refresh( this );
1059         }
1060         return error;
1061 }
1062
1063 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out )
1064 {
1065         int error = ( clip < 0 || clip >= this->count );
1066
1067         // Ensure that the clip request is actually a mix
1068         if ( error == 0 )
1069         {
1070                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1071                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1072                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL;
1073         }
1074
1075         if ( error == 0 )
1076         {
1077                 playlist_entry *mix = this->list[ clip ];
1078                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1079                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1080                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1081                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1082                 mlt_producer track_a = mlt_tractor_get_track( tractor, 0 );
1083                 mlt_producer track_b = mlt_tractor_get_track( tractor, 1 );
1084                 int length = out - in + 1;
1085                 int length_diff = length - mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1086                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1087
1088                 if ( clip_a != NULL )
1089                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) - length_diff );
1090
1091                 if ( clip_b != NULL )
1092                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) + length_diff, mlt_producer_get_out( clip_b ) );
1093
1094                 mlt_producer_set_in_and_out( track_a, mlt_producer_get_in( track_a ) - length_diff, mlt_producer_get_out( track_a ) );
1095                 mlt_producer_set_in_and_out( track_b, mlt_producer_get_in( track_b ), mlt_producer_get_out( track_b ) + length_diff );
1096                 mlt_producer_set_in_and_out( MLT_MULTITRACK_PRODUCER( mlt_tractor_multitrack( tractor ) ), in, out );
1097                 mlt_producer_set_in_and_out( MLT_TRACTOR_PRODUCER( tractor ), in, out );
1098                 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( mix->producer ), "length", out - in + 1 );
1099                 mlt_producer_set_in_and_out( mix->producer, in, out );
1100
1101                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1102                 mlt_playlist_virtual_refresh( this );
1103         }
1104         return error;
1105 }
1106
1107 /** Consolodate adjacent blank producers.
1108 */
1109
1110 void mlt_playlist_consolidate_blanks( mlt_playlist this, int keep_length )
1111 {
1112         if ( this != NULL )
1113         {
1114                 int i = 0;
1115                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1116
1117                 mlt_events_block( properties, properties );
1118                 for ( i = 1; i < this->count; i ++ )
1119                 {
1120                         playlist_entry *left = this->list[ i - 1 ];
1121                         playlist_entry *right = this->list[ i ];
1122
1123                         if ( mlt_producer_cut_parent( left->producer ) == mlt_producer_cut_parent( right->producer ) &&
1124                                  mlt_producer_is_blank( left->producer ) )
1125                         {
1126                                 mlt_playlist_resize_clip( this, i - 1, 0, left->frame_count + right->frame_count - 1 );
1127                                 mlt_playlist_remove( this, i -- );
1128                         }
1129                 }
1130
1131                 if ( !keep_length )
1132                 {
1133                         playlist_entry *last = this->list[ this->count - 1 ];
1134                         if ( mlt_producer_is_blank( last->producer ) )
1135                                 mlt_playlist_remove( this, this->count - 1 );
1136                 }
1137
1138                 mlt_events_unblock( properties, properties );
1139                 mlt_playlist_virtual_refresh( this );
1140         }
1141 }
1142
1143 /** Determine if the specified clip index is a blank.
1144 */
1145
1146 int mlt_playlist_is_blank( mlt_playlist this, int clip )
1147 {
1148         return this == NULL || mlt_producer_is_blank( mlt_playlist_get_clip( this, clip ) );
1149 }
1150
1151 /** Replace the specified clip with a blank and return the clip.
1152 */
1153
1154 mlt_producer mlt_playlist_replace_with_blank( mlt_playlist this, int clip )
1155 {
1156         mlt_producer producer = NULL;
1157         if ( !mlt_playlist_is_blank( this, clip ) )
1158         {
1159                 playlist_entry *entry = this->list[ clip ];
1160                 int in = entry->frame_in;
1161                 int out = entry->frame_out;
1162                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1163                 producer = entry->producer;
1164                 mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
1165                 mlt_events_block( properties, properties );
1166                 mlt_playlist_remove( this, clip );
1167                 mlt_playlist_blank( this, out - in );
1168                 mlt_playlist_move( this, this->count - 1, clip );
1169                 mlt_producer_set_in_and_out( producer, in, out );
1170                 mlt_events_unblock( properties, properties );
1171                 mlt_playlist_virtual_refresh( this );
1172         }
1173         return producer;
1174 }
1175
1176 void mlt_playlist_insert_blank( mlt_playlist this, int clip, int length )
1177 {
1178         if ( this != NULL && length > 0 )
1179         {
1180                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1181                 mlt_events_block( properties, properties );
1182                 mlt_playlist_blank( this, length );
1183                 mlt_playlist_move( this, this->count - 1, clip );
1184                 mlt_events_unblock( properties, properties );
1185                 mlt_playlist_virtual_refresh( this );
1186         }
1187 }
1188
1189 void mlt_playlist_pad_blanks( mlt_playlist this, int position, int length, int find )
1190 {
1191         if ( this != NULL && length != 0 )
1192         {
1193                 int clip = mlt_playlist_get_clip_index_at( this, position );
1194                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1195                 mlt_events_block( properties, properties );
1196                 if ( find && clip < this->count && !mlt_playlist_is_blank( this, clip ) )
1197                         clip ++;
1198                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1199                 {
1200                         mlt_playlist_clip_info info;
1201                         mlt_playlist_get_clip_info( this, &info, clip );
1202                         if ( info.frame_out + length > info.frame_in )
1203                                 mlt_playlist_resize_clip( this, clip, info.frame_in, info.frame_out + length );
1204                         else
1205                                 mlt_playlist_remove( this, clip );
1206                 }
1207                 else if ( find && clip < this->count && length > 0  )
1208                 {
1209                         mlt_playlist_insert_blank( this, clip, length );
1210                 }
1211                 mlt_events_unblock( properties, properties );
1212                 mlt_playlist_virtual_refresh( this );
1213         }
1214 }
1215
1216 int mlt_playlist_insert_at( mlt_playlist this, int position, mlt_producer producer, int mode )
1217 {
1218         int ret = this == NULL || position < 0 || producer == NULL;
1219         if ( ret == 0 )
1220         {
1221                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1222                 int length = mlt_producer_get_playtime( producer );
1223                 int clip = mlt_playlist_get_clip_index_at( this, position );
1224                 mlt_playlist_clip_info info;
1225                 mlt_playlist_get_clip_info( this, &info, clip );
1226                 mlt_events_block( properties, this );
1227                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1228                 {
1229                         mlt_playlist_split( this, clip, position - info.start );
1230                         mlt_playlist_get_clip_info( this, &info, ++ clip );
1231                         if ( length < info.frame_count )
1232                                 mlt_playlist_split( this, clip, length );
1233                         mlt_playlist_remove( this, clip );
1234                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1235                         ret = clip;
1236                 }
1237                 else if ( clip < this->count )
1238                 {
1239                         if ( position > info.start + info.frame_count / 2 )
1240                                 clip ++;
1241                         if ( mode == 1 && clip < this->count && mlt_playlist_is_blank( this, clip ) )
1242                         {
1243                                 mlt_playlist_get_clip_info( this, &info, clip );
1244                                 if ( length < info.frame_count )
1245                                         mlt_playlist_split( this, clip, length );
1246                                 mlt_playlist_remove( this, clip );
1247                         }
1248                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1249                         ret = clip;
1250                 }
1251                 else
1252                 {
1253                         if ( mode == 1 )
1254                                 mlt_playlist_blank( this, position - mlt_properties_get_int( properties, "length" ) );
1255                         mlt_playlist_append( this, producer );
1256                         ret = this->count - 1;
1257                 }
1258                 mlt_events_unblock( properties, this );
1259                 mlt_playlist_virtual_refresh( this );
1260         }
1261         else
1262         {
1263                 ret = -1;
1264         }
1265         return ret;
1266 }
1267
1268 int mlt_playlist_clip_start( mlt_playlist this, int clip )
1269 {
1270         mlt_playlist_clip_info info;
1271         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1272                 return info.start;
1273         return 0;
1274 }
1275
1276 int mlt_playlist_clip_length( mlt_playlist this, int clip )
1277 {
1278         mlt_playlist_clip_info info;
1279         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1280                 return info.frame_count;
1281         return 0;
1282 }
1283
1284 int mlt_playlist_blanks_from( mlt_playlist this, int clip, int bounded )
1285 {
1286         int count = 0;
1287         mlt_playlist_clip_info info;
1288         if ( this != NULL && clip < this->count )
1289         {
1290                 mlt_playlist_get_clip_info( this, &info, clip );
1291                 if ( mlt_playlist_is_blank( this, clip ) )
1292                         count += info.frame_count;
1293                 if ( bounded == 0 )
1294                         bounded = this->count;
1295                 for ( clip ++; clip < this->count && bounded >= 0; clip ++ )
1296                 {
1297                         mlt_playlist_get_clip_info( this, &info, clip );
1298                         if ( mlt_playlist_is_blank( this, clip ) )
1299                                 count += info.frame_count;
1300                         else
1301                                 bounded --;
1302                 }
1303         }
1304         return count;
1305 }
1306
1307 int mlt_playlist_remove_region( mlt_playlist this, int position, int length )
1308 {
1309         int index = mlt_playlist_get_clip_index_at( this, position );
1310         if ( index >= 0 && index < this->count )
1311         {
1312                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1313                 int clip_start = mlt_playlist_clip_start( this, index );
1314                 int clip_length = mlt_playlist_clip_length( this, index );
1315                 int list_length = mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
1316                 mlt_events_block( properties, this );
1317
1318                 if ( position + length > list_length )
1319                         length -= ( position + length - list_length );
1320
1321                 if ( clip_start < position )
1322                 {
1323                         mlt_playlist_split( this, index ++, position - clip_start );
1324                         clip_length -= position - clip_start;
1325                 }
1326
1327                 while( length > 0 )
1328                 {
1329                         if ( mlt_playlist_clip_length( this, index ) > length )
1330                                 mlt_playlist_split( this, index, length );
1331                         length -= mlt_playlist_clip_length( this, index );
1332                         mlt_playlist_remove( this, index );
1333                 }
1334
1335                 mlt_playlist_consolidate_blanks( this, 0 );
1336                 mlt_events_unblock( properties, this );
1337                 mlt_playlist_virtual_refresh( this );
1338
1339                 // Just to be sure, we'll get the clip index again...
1340                 index = mlt_playlist_get_clip_index_at( this, position );
1341         }
1342         return index;
1343 }
1344
1345 int mlt_playlist_move_region( mlt_playlist this, int position, int length, int new_position )
1346 {
1347         if ( this != NULL )
1348         {
1349         }
1350         return 0;
1351 }
1352
1353 /** Get the current frame.
1354 */
1355
1356 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
1357 {
1358         // Check that we have a producer
1359         if ( producer == NULL )
1360         {
1361                 *frame = mlt_frame_init( );
1362                 return 0;
1363         }
1364
1365         // Get this mlt_playlist
1366         mlt_playlist this = producer->child;
1367
1368         // Need to ensure the frame is deinterlaced when repeating 1 frame
1369         int progressive = 0;
1370
1371         // Get the real producer
1372         mlt_service real = mlt_playlist_virtual_seek( this, &progressive );
1373
1374         // Check that we have a producer
1375         if ( real == NULL )
1376         {
1377                 *frame = mlt_frame_init( );
1378                 return 0;
1379         }
1380
1381         // Get the frame
1382         mlt_service_get_frame( real, frame, index );
1383
1384         // Check if we're at the end of the clip
1385         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
1386         if ( mlt_properties_get_int( properties, "end_of_clip" ) )
1387                 mlt_playlist_virtual_set_out( this );
1388
1389         // Set the consumer progressive property
1390         if ( progressive )
1391         {
1392                 mlt_properties_set_int( properties, "consumer_deinterlace", progressive );
1393                 mlt_properties_set_int( properties, "test_audio", 1 );
1394         }
1395
1396         // Check for notifier and call with appropriate argument
1397         mlt_properties playlist_properties = MLT_PRODUCER_PROPERTIES( producer );
1398         void ( *notifier )( void * ) = mlt_properties_get_data( playlist_properties, "notifier", NULL );
1399         if ( notifier != NULL )
1400         {
1401                 void *argument = mlt_properties_get_data( playlist_properties, "notifier_arg", NULL );
1402                 notifier( argument );
1403         }
1404
1405         // Update position on the frame we're creating
1406         mlt_frame_set_position( *frame, mlt_producer_frame( producer ) );
1407
1408         // Position ourselves on the next frame
1409         mlt_producer_prepare_next( producer );
1410
1411         return 0;
1412 }
1413
1414 /** Close the playlist.
1415 */
1416
1417 void mlt_playlist_close( mlt_playlist this )
1418 {
1419         if ( this != NULL && mlt_properties_dec_ref( MLT_PLAYLIST_PROPERTIES( this ) ) <= 0 )
1420         {
1421                 int i = 0;
1422                 this->parent.close = NULL;
1423                 for ( i = 0; i < this->count; i ++ )
1424                 {
1425                         mlt_event_close( this->list[ i ]->event );
1426                         mlt_producer_close( this->list[ i ]->producer );
1427                         free( this->list[ i ] );
1428                 }
1429                 mlt_producer_close( &this->blank );
1430                 mlt_producer_close( &this->parent );
1431                 free( this->list );
1432                 free( this );
1433         }
1434 }