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                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
 759
 760                 mlt_events_block( properties, properties );
 761
 762                 if ( mlt_producer_is_blank( producer ) )
 763                 {
 764                         // Make sure the blank is long enough to accomodate the length specified
 765                         if ( out - in + 1 > mlt_producer_get_length( &this->blank ) )
 766                         {
 767                                 mlt_properties blank_props = MLT_PRODUCER_PROPERTIES( &this->blank );
 768                                 mlt_properties_set_int( blank_props, "length", out - in + 1 );
 769                                 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( producer ), "length", out - in + 1 );
 770                                 mlt_producer_set_in_and_out( &this->blank, 0, out - in );
 771                         }
 772                 }
 773
 774                 if ( in <= -1 )
 775                         in = 0;
 776                 if ( out <= -1 || out >= mlt_producer_get_length( producer ) )
 777                         out = mlt_producer_get_length( producer ) - 1;
 778
 779                 if ( out < in )
 780                 {
 781                         mlt_position t = in;
 782                         in = out;
 783                         out = t;
 784                 }
 785
 786                 mlt_producer_set_in_and_out( producer, in, out );
 787                 mlt_events_unblock( properties, properties );
 788                 mlt_playlist_virtual_refresh( this );
 789         }
 790         return error;
 791 }
 792
 793 /** Split a clip on the playlist at the given position.
 794 */
 795
 796 int mlt_playlist_split( mlt_playlist this, int clip, mlt_position position )
 797 {
 798         int error = clip < 0 || clip >= this->count;
 799         if ( error == 0 )
 800         {
 801                 playlist_entry *entry = this->list[ clip ];
 802                 position = position < 0 ? entry->frame_count + position - 1 : position;
 803                 if ( position >= 0 && position <= entry->frame_count )
 804                 {
 805                         int in = entry->frame_in;
 806                         int out = entry->frame_out;
 807                         mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 808                         mlt_playlist_resize_clip( this, clip, in, in + position );
 809                         if ( !mlt_producer_is_blank( entry->producer ) )
 810                         {
 811                                 int i = 0;
 812                                 mlt_properties entry_properties = MLT_PRODUCER_PROPERTIES( entry->producer );
 813                                 mlt_producer split = mlt_producer_cut( entry->producer, in + position + 1, out );
 814                                 mlt_properties split_properties = MLT_PRODUCER_PROPERTIES( split );
 815                                 mlt_playlist_insert( this, split, clip + 1, 0, -1 );
 816                                 for ( i = 0; i < mlt_properties_count( entry_properties ); i ++ )
 817                                 {
 818                                         char *name = mlt_properties_get_name( entry_properties, i );
 819                                         if ( name != NULL && !strncmp( name, "meta.", 5 ) )
 820                                                 mlt_properties_set( split_properties, name, mlt_properties_get_value( entry_properties, i ) );
 821                                 }
 822                                 mlt_producer_close( split );
 823                         }
 824                         else
 825                         {
 826                                 mlt_playlist_insert( this, &this->blank, clip + 1, 0, out - position - 1 );
 827                         }
 828                         mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 829                         mlt_playlist_virtual_refresh( this );
 830                 }
 831                 else
 832                 {
 833                         error = 1;
 834                 }
 835         }
 836         return error;
 837 }
 838
 839 /** Join 1 or more consecutive clips.
 840 */
 841
 842 int mlt_playlist_join( mlt_playlist this, int clip, int count, int merge )
 843 {
 844         int error = clip < 0 || ( clip ) >= this->count;
 845         if ( error == 0 )
 846         {
 847                 int i = clip;
 848                 mlt_playlist new_clip = mlt_playlist_init( );
 849                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 850                 if ( clip + count >= this->count )
 851                         count = this->count - clip;
 852                 for ( i = 0; i <= count; i ++ )
 853                 {
 854                         playlist_entry *entry = this->list[ clip ];
 855                         mlt_playlist_append( new_clip, entry->producer );
 856                         mlt_playlist_repeat_clip( new_clip, i, entry->repeat );
 857                         entry->preservation_hack = 1;
 858                         mlt_playlist_remove( this, clip );
 859                 }
 860                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 861                 mlt_playlist_insert( this, MLT_PLAYLIST_PRODUCER( new_clip ), clip, 0, -1 );
 862                 mlt_playlist_close( new_clip );
 863         }
 864         return error;
 865 }
 866
 867 /** Mix consecutive clips for a specified length and apply transition if specified.
 868 */
 869
 870 int mlt_playlist_mix( mlt_playlist this, int clip, int length, mlt_transition transition )
 871 {
 872         int error = ( clip < 0 || clip + 1 >= this->count );
 873         if ( error == 0 )
 874         {
 875                 playlist_entry *clip_a = this->list[ clip ];
 876                 playlist_entry *clip_b = this->list[ clip + 1 ];
 877                 mlt_producer track_a = NULL;
 878                 mlt_producer track_b = NULL;
 879                 mlt_tractor tractor = mlt_tractor_new( );
 880                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
 881
 882                 // Check length is valid for both clips and resize if necessary.
 883                 int max_size = clip_a->frame_count > clip_b->frame_count ? clip_a->frame_count : clip_b->frame_count;
 884                 length = length > max_size ? max_size : length;
 885
 886                 // Create the a and b tracks/cuts if necessary - note that no cuts are required if the length matches
 887                 if ( length != clip_a->frame_count )
 888                         track_a = mlt_producer_cut( clip_a->producer, clip_a->frame_out - length + 1, clip_a->frame_out );
 889                 else
 890                         track_a = clip_a->producer;
 891
 892                 if ( length != clip_b->frame_count )
 893                         track_b = mlt_producer_cut( clip_b->producer, clip_b->frame_in, clip_b->frame_in + length - 1 );
 894                 else
 895                         track_b = clip_b->producer;
 896
 897                 // Set the tracks on the tractor
 898                 mlt_tractor_set_track( tractor, track_a, 0 );
 899                 mlt_tractor_set_track( tractor, track_b, 1 );
 900
 901                 // Insert the mix object into the playlist
 902                 mlt_playlist_insert( this, MLT_TRACTOR_PRODUCER( tractor ), clip + 1, -1, -1 );
 903                 mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mlt_mix", tractor, 0, NULL, NULL );
 904
 905                 // Attach the transition
 906                 if ( transition != NULL )
 907                 {
 908                         mlt_field field = mlt_tractor_field( tractor );
 909                         mlt_field_plant_transition( field, transition, 0, 1 );
 910                         mlt_transition_set_in_and_out( transition, 0, length - 1 );
 911                 }
 912
 913                 // Close our references to the tracks if we created new cuts above (the tracks can still be used here)
 914                 if ( track_a != clip_a->producer )
 915                         mlt_producer_close( track_a );
 916                 if ( track_b != clip_b->producer )
 917                         mlt_producer_close( track_b );
 918
 919                 // Check if we have anything left on the right hand clip
 920                 if ( track_b == clip_b->producer )
 921                 {
 922                         clip_b->preservation_hack = 1;
 923                         mlt_playlist_remove( this, clip + 2 );
 924                 }
 925                 else if ( clip_b->frame_out - clip_b->frame_in > length )
 926                 {
 927                         mlt_playlist_resize_clip( this, clip + 2, clip_b->frame_in + length, clip_b->frame_out );
 928                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_b->producer ), "mix_in", tractor, 0, NULL, NULL );
 929                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_out", clip_b->producer, 0, NULL, NULL );
 930                 }
 931                 else
 932                 {
 933                         mlt_producer_clear( clip_b->producer );
 934                         mlt_playlist_remove( this, clip + 2 );
 935                 }
 936
 937                 // Check if we have anything left on the left hand clip
 938                 if ( track_a == clip_a->producer )
 939                 {
 940                         clip_a->preservation_hack = 1;
 941                         mlt_playlist_remove( this, clip );
 942                 }
 943                 else if ( clip_a->frame_out - clip_a->frame_in > length )
 944                 {
 945                         mlt_playlist_resize_clip( this, clip, clip_a->frame_in, clip_a->frame_out - length );
 946                         mlt_properties_set_data( MLT_PRODUCER_PROPERTIES( clip_a->producer ), "mix_out", tractor, 0, NULL, NULL );
 947                         mlt_properties_set_data( MLT_TRACTOR_PROPERTIES( tractor ), "mix_in", clip_a->producer, 0, NULL, NULL );
 948                 }
 949                 else
 950                 {
 951                         mlt_producer_clear( clip_a->producer );
 952                         mlt_playlist_remove( this, clip );
 953                 }
 954
 955                 // Unblock and force a fire off of change events to listeners
 956                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
 957                 mlt_playlist_virtual_refresh( this );
 958                 mlt_tractor_close( tractor );
 959         }
 960         return error;
 961 }
 962
 963 /** Add a transition to an existing mix.
 964 */
 965
 966 int mlt_playlist_mix_add( mlt_playlist this, int clip, mlt_transition transition )
 967 {
 968         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
 969         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
 970         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
 971         int error = transition == NULL || tractor == NULL;
 972         if ( error == 0 )
 973         {
 974                 mlt_field field = mlt_tractor_field( tractor );
 975                 mlt_field_plant_transition( field, transition, 0, 1 );
 976                 mlt_transition_set_in_and_out( transition, 0, this->list[ clip ]->frame_count - 1 );
 977         }
 978         return error;
 979 }
 980
 981 /** Return the clip at the clip index.
 982 */
 983
 984 mlt_producer mlt_playlist_get_clip( mlt_playlist this, int clip )
 985 {
 986         if ( clip >= 0 && clip < this->count )
 987                 return this->list[ clip ]->producer;
 988         return NULL;
 989 }
 990
 991 /** Return the clip at the specified position.
 992 */
 993
 994 mlt_producer mlt_playlist_get_clip_at( mlt_playlist this, int position )
 995 {
 996         int index = 0, total = 0;
 997         return mlt_playlist_locate( this, &position, &index, &total );
 998 }
 999
1000 /** Return the clip index of the specified position.
1001 */
1002
1003 int mlt_playlist_get_clip_index_at( mlt_playlist this, int position )
1004 {
1005         int index = 0, total = 0;
1006         mlt_playlist_locate( this, &position, &index, &total );
1007         return index;
1008 }
1009
1010 /** Determine if the clip is a mix.
1011 */
1012
1013 int mlt_playlist_clip_is_mix( mlt_playlist this, int clip )
1014 {
1015         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
1016         mlt_properties properties = producer != NULL ? MLT_PRODUCER_PROPERTIES( producer ) : NULL;
1017         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
1018         return tractor != NULL;
1019 }
1020
1021 /** Remove a mixed clip - ensure that the cuts included in the mix find their way
1022         back correctly on to the playlist.
1023 */
1024
1025 static int mlt_playlist_unmix( mlt_playlist this, int clip )
1026 {
1027         int error = ( clip < 0 || clip >= this->count );
1028
1029         // Ensure that the clip request is actually a mix
1030         if ( error == 0 )
1031         {
1032                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1033                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1034                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL ||
1035                             this->list[ clip ]->preservation_hack;
1036         }
1037
1038         if ( error == 0 )
1039         {
1040                 playlist_entry *mix = this->list[ clip ];
1041                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1042                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1043                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1044                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1045                 int length = mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1046                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1047
1048                 if ( clip_a != NULL )
1049                 {
1050                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) + length );
1051                 }
1052                 else
1053                 {
1054                         mlt_producer cut = mlt_tractor_get_track( tractor, 0 );
1055                         mlt_playlist_insert( this, cut, clip, -1, -1 );
1056                         clip ++;
1057                 }
1058
1059                 if ( clip_b != NULL )
1060                 {
1061                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) - length, mlt_producer_get_out( clip_b ) );
1062                 }
1063                 else
1064                 {
1065                         mlt_producer cut = mlt_tractor_get_track( tractor, 1 );
1066                         mlt_playlist_insert( this, cut, clip + 1, -1, -1 );
1067                 }
1068
1069                 mlt_properties_set_data( properties, "mlt_mix", NULL, 0, NULL, NULL );
1070                 mlt_playlist_remove( this, clip );
1071                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1072                 mlt_playlist_virtual_refresh( this );
1073         }
1074         return error;
1075 }
1076
1077 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out )
1078 {
1079         int error = ( clip < 0 || clip >= this->count );
1080
1081         // Ensure that the clip request is actually a mix
1082         if ( error == 0 )
1083         {
1084                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
1085                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
1086                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL;
1087         }
1088
1089         if ( error == 0 )
1090         {
1091                 playlist_entry *mix = this->list[ clip ];
1092                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
1093                 mlt_properties properties = MLT_TRACTOR_PROPERTIES( tractor );
1094                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1095                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1096                 mlt_producer track_a = mlt_tractor_get_track( tractor, 0 );
1097                 mlt_producer track_b = mlt_tractor_get_track( tractor, 1 );
1098                 int length = out - in + 1;
1099                 int length_diff = length - mlt_producer_get_playtime( MLT_TRACTOR_PRODUCER( tractor ) );
1100                 mlt_events_block( MLT_PLAYLIST_PROPERTIES( this ), this );
1101
1102                 if ( clip_a != NULL )
1103                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) - length_diff );
1104
1105                 if ( clip_b != NULL )
1106                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) + length_diff, mlt_producer_get_out( clip_b ) );
1107
1108                 mlt_producer_set_in_and_out( track_a, mlt_producer_get_in( track_a ) - length_diff, mlt_producer_get_out( track_a ) );
1109                 mlt_producer_set_in_and_out( track_b, mlt_producer_get_in( track_b ), mlt_producer_get_out( track_b ) + length_diff );
1110                 mlt_producer_set_in_and_out( MLT_MULTITRACK_PRODUCER( mlt_tractor_multitrack( tractor ) ), in, out );
1111                 mlt_producer_set_in_and_out( MLT_TRACTOR_PRODUCER( tractor ), in, out );
1112                 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( mix->producer ), "length", out - in + 1 );
1113                 mlt_producer_set_in_and_out( mix->producer, in, out );
1114
1115                 mlt_events_unblock( MLT_PLAYLIST_PROPERTIES( this ), this );
1116                 mlt_playlist_virtual_refresh( this );
1117         }
1118         return error;
1119 }
1120
1121 /** Consolodate adjacent blank producers.
1122 */
1123
1124 void mlt_playlist_consolidate_blanks( mlt_playlist this, int keep_length )
1125 {
1126         if ( this != NULL )
1127         {
1128                 int i = 0;
1129                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1130
1131                 mlt_events_block( properties, properties );
1132                 for ( i = 1; i < this->count; i ++ )
1133                 {
1134                         playlist_entry *left = this->list[ i - 1 ];
1135                         playlist_entry *right = this->list[ i ];
1136
1137                         if ( mlt_producer_is_blank( left->producer ) && mlt_producer_is_blank( right->producer ) )
1138                         {
1139                                 mlt_playlist_resize_clip( this, i - 1, 0, left->frame_count + right->frame_count - 1 );
1140                                 mlt_playlist_remove( this, i -- );
1141                         }
1142                 }
1143
1144                 if ( !keep_length )
1145                 {
1146                         playlist_entry *last = this->list[ this->count - 1 ];
1147                         if ( mlt_producer_is_blank( last->producer ) )
1148                                 mlt_playlist_remove( this, this->count - 1 );
1149                 }
1150
1151                 mlt_events_unblock( properties, properties );
1152                 mlt_playlist_virtual_refresh( this );
1153         }
1154 }
1155
1156 /** Determine if the specified clip index is a blank.
1157 */
1158
1159 int mlt_playlist_is_blank( mlt_playlist this, int clip )
1160 {
1161         return this == NULL || mlt_producer_is_blank( mlt_playlist_get_clip( this, clip ) );
1162 }
1163
1164 /** Replace the specified clip with a blank and return the clip.
1165 */
1166
1167 mlt_producer mlt_playlist_replace_with_blank( mlt_playlist this, int clip )
1168 {
1169         mlt_producer producer = NULL;
1170         if ( !mlt_playlist_is_blank( this, clip ) )
1171         {
1172                 playlist_entry *entry = this->list[ clip ];
1173                 int in = entry->frame_in;
1174                 int out = entry->frame_out;
1175                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1176                 producer = entry->producer;
1177                 mlt_properties_inc_ref( MLT_PRODUCER_PROPERTIES( producer ) );
1178                 mlt_events_block( properties, properties );
1179                 mlt_playlist_remove( this, clip );
1180                 mlt_playlist_blank( this, out - in );
1181                 mlt_playlist_move( this, this->count - 1, clip );
1182                 mlt_events_unblock( properties, properties );
1183                 mlt_playlist_virtual_refresh( this );
1184                 mlt_producer_set_in_and_out( producer, in, out );
1185         }
1186         return producer;
1187 }
1188
1189 void mlt_playlist_insert_blank( mlt_playlist this, int clip, int length )
1190 {
1191         if ( this != NULL && length > 0 )
1192         {
1193                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1194                 mlt_events_block( properties, properties );
1195                 mlt_playlist_blank( this, length );
1196                 mlt_playlist_move( this, this->count - 1, clip );
1197                 mlt_events_unblock( properties, properties );
1198                 mlt_playlist_virtual_refresh( this );
1199         }
1200 }
1201
1202 void mlt_playlist_pad_blanks( mlt_playlist this, int position, int length, int find )
1203 {
1204         if ( this != NULL && length != 0 )
1205         {
1206                 int clip = mlt_playlist_get_clip_index_at( this, position );
1207                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1208                 mlt_events_block( properties, properties );
1209                 if ( find && clip < this->count && !mlt_playlist_is_blank( this, clip ) )
1210                         clip ++;
1211                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1212                 {
1213                         mlt_playlist_clip_info info;
1214                         mlt_playlist_get_clip_info( this, &info, clip );
1215                         if ( info.frame_out + length > info.frame_in )
1216                                 mlt_playlist_resize_clip( this, clip, info.frame_in, info.frame_out + length );
1217                         else
1218                                 mlt_playlist_remove( this, clip );
1219                 }
1220                 else if ( find && clip < this->count && length > 0  )
1221                 {
1222                         mlt_playlist_insert_blank( this, clip, length );
1223                 }
1224                 mlt_events_unblock( properties, properties );
1225                 mlt_playlist_virtual_refresh( this );
1226         }
1227 }
1228
1229 int mlt_playlist_insert_at( mlt_playlist this, int position, mlt_producer producer, int mode )
1230 {
1231         int ret = this == NULL || position < 0 || producer == NULL;
1232         if ( ret == 0 )
1233         {
1234                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1235                 int length = mlt_producer_get_playtime( producer );
1236                 int clip = mlt_playlist_get_clip_index_at( this, position );
1237                 mlt_playlist_clip_info info;
1238                 mlt_playlist_get_clip_info( this, &info, clip );
1239                 mlt_events_block( properties, this );
1240                 if ( clip < this->count && mlt_playlist_is_blank( this, clip ) )
1241                 {
1242                         // Split and move to new clip if need be
1243                         if ( mlt_playlist_split( this, clip, position - info.start ) == 0 )
1244                                 mlt_playlist_get_clip_info( this, &info, ++ clip );
1245
1246                         // Split again if need be
1247                         if ( length < info.frame_count )
1248                                 mlt_playlist_split( this, clip, length - 1 );
1249
1250                         // Remove
1251                         mlt_playlist_remove( this, clip );
1252
1253                         // Insert
1254                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1255                         ret = clip;
1256                 }
1257                 else if ( clip < this->count )
1258                 {
1259                         if ( position > info.start + info.frame_count / 2 )
1260                                 clip ++;
1261                         if ( mode == 1 && clip < this->count && mlt_playlist_is_blank( this, clip ) )
1262                         {
1263                                 mlt_playlist_get_clip_info( this, &info, clip );
1264                                 if ( length < info.frame_count )
1265                                         mlt_playlist_split( this, clip, length );
1266                                 mlt_playlist_remove( this, clip );
1267                         }
1268                         mlt_playlist_insert( this, producer, clip, -1, -1 );
1269                         ret = clip;
1270                 }
1271                 else
1272                 {
1273                         if ( mode == 1 )
1274                                 mlt_playlist_blank( this, position - mlt_properties_get_int( properties, "length" ) );
1275                         mlt_playlist_append( this, producer );
1276                         ret = this->count - 1;
1277                 }
1278                 mlt_events_unblock( properties, this );
1279                 mlt_playlist_virtual_refresh( this );
1280         }
1281         else
1282         {
1283                 ret = -1;
1284         }
1285         return ret;
1286 }
1287
1288 int mlt_playlist_clip_start( mlt_playlist this, int clip )
1289 {
1290         mlt_playlist_clip_info info;
1291         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1292                 return info.start;
1293         return 0;
1294 }
1295
1296 int mlt_playlist_clip_length( mlt_playlist this, int clip )
1297 {
1298         mlt_playlist_clip_info info;
1299         if ( mlt_playlist_get_clip_info( this, &info, clip ) == 0 )
1300                 return info.frame_count;
1301         return 0;
1302 }
1303
1304 int mlt_playlist_blanks_from( mlt_playlist this, int clip, int bounded )
1305 {
1306         int count = 0;
1307         mlt_playlist_clip_info info;
1308         if ( this != NULL && clip < this->count )
1309         {
1310                 mlt_playlist_get_clip_info( this, &info, clip );
1311                 if ( mlt_playlist_is_blank( this, clip ) )
1312                         count += info.frame_count;
1313                 if ( bounded == 0 )
1314                         bounded = this->count;
1315                 for ( clip ++; clip < this->count && bounded >= 0; clip ++ )
1316                 {
1317                         mlt_playlist_get_clip_info( this, &info, clip );
1318                         if ( mlt_playlist_is_blank( this, clip ) )
1319                                 count += info.frame_count;
1320                         else
1321                                 bounded --;
1322                 }
1323         }
1324         return count;
1325 }
1326
1327 int mlt_playlist_remove_region( mlt_playlist this, int position, int length )
1328 {
1329         int index = mlt_playlist_get_clip_index_at( this, position );
1330         if ( index >= 0 && index < this->count )
1331         {
1332                 mlt_properties properties = MLT_PLAYLIST_PROPERTIES( this );
1333                 int clip_start = mlt_playlist_clip_start( this, index );
1334                 int clip_length = mlt_playlist_clip_length( this, index );
1335                 int list_length = mlt_producer_get_playtime( MLT_PLAYLIST_PRODUCER( this ) );
1336                 mlt_events_block( properties, this );
1337
1338                 if ( position + length > list_length )
1339                         length -= ( position + length - list_length );
1340
1341                 if ( clip_start < position )
1342                 {
1343                         mlt_playlist_split( this, index ++, position - clip_start );
1344                         clip_length -= position - clip_start;
1345                 }
1346
1347                 while( length > 0 )
1348                 {
1349                         if ( mlt_playlist_clip_length( this, index ) > length )
1350                                 mlt_playlist_split( this, index, length );
1351                         length -= mlt_playlist_clip_length( this, index );
1352                         mlt_playlist_remove( this, index );
1353                 }
1354
1355                 mlt_playlist_consolidate_blanks( this, 0 );
1356                 mlt_events_unblock( properties, this );
1357                 mlt_playlist_virtual_refresh( this );
1358
1359                 // Just to be sure, we'll get the clip index again...
1360                 index = mlt_playlist_get_clip_index_at( this, position );
1361         }
1362         return index;
1363 }
1364
1365 int mlt_playlist_move_region( mlt_playlist this, int position, int length, int new_position )
1366 {
1367         if ( this != NULL )
1368         {
1369         }
1370         return 0;
1371 }
1372
1373 /** Get the current frame.
1374 */
1375
1376 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
1377 {
1378         // Check that we have a producer
1379         if ( producer == NULL )
1380         {
1381                 *frame = mlt_frame_init( );
1382                 return 0;
1383         }
1384
1385         // Get this mlt_playlist
1386         mlt_playlist this = producer->child;
1387
1388         // Need to ensure the frame is deinterlaced when repeating 1 frame
1389         int progressive = 0;
1390
1391         // Get the real producer
1392         mlt_service real = mlt_playlist_virtual_seek( this, &progressive );
1393
1394         // Check that we have a producer
1395         if ( real == NULL )
1396         {
1397                 *frame = mlt_frame_init( );
1398                 return 0;
1399         }
1400
1401         // Get the frame
1402         mlt_service_get_frame( real, frame, index );
1403
1404         // Check if we're at the end of the clip
1405         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
1406         if ( mlt_properties_get_int( properties, "end_of_clip" ) )
1407                 mlt_playlist_virtual_set_out( this );
1408
1409         // Set the consumer progressive property
1410         if ( progressive )
1411         {
1412                 mlt_properties_set_int( properties, "consumer_deinterlace", progressive );
1413                 mlt_properties_set_int( properties, "test_audio", 1 );
1414         }
1415
1416         // Check for notifier and call with appropriate argument
1417         mlt_properties playlist_properties = MLT_PRODUCER_PROPERTIES( producer );
1418         void ( *notifier )( void * ) = mlt_properties_get_data( playlist_properties, "notifier", NULL );
1419         if ( notifier != NULL )
1420         {
1421                 void *argument = mlt_properties_get_data( playlist_properties, "notifier_arg", NULL );
1422                 notifier( argument );
1423         }
1424
1425         // Update position on the frame we're creating
1426         mlt_frame_set_position( *frame, mlt_producer_frame( producer ) );
1427
1428         // Position ourselves on the next frame
1429         mlt_producer_prepare_next( producer );
1430
1431         return 0;
1432 }
1433
1434 /** Close the playlist.
1435 */
1436
1437 void mlt_playlist_close( mlt_playlist this )
1438 {
1439         if ( this != NULL && mlt_properties_dec_ref( MLT_PLAYLIST_PROPERTIES( this ) ) <= 0 )
1440         {
1441                 int i = 0;
1442                 this->parent.close = NULL;
1443                 for ( i = 0; i < this->count; i ++ )
1444                 {
1445                         mlt_event_close( this->list[ i ]->event );
1446                         mlt_producer_close( this->list[ i ]->producer );
1447                         free( this->list[ i ] );
1448                 }
1449                 mlt_producer_close( &this->blank );
1450                 mlt_producer_close( &this->parent );
1451                 free( this->list );
1452                 free( this );
1453         }
1454 }