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 typedef 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 playlist_entry;
  49
  50 /** Private definition.
  51 */
  52
  53 struct mlt_playlist_s
  54 {
  55         struct mlt_producer_s parent;
  56         struct mlt_producer_s blank;
  57
  58         int size;
  59         int count;
  60         playlist_entry **list;
  61 };
  62
  63 /** Forward declarations
  64 */
  65
  66 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  67 static int mlt_playlist_unmix( mlt_playlist this, int clip );
  68 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out );
  69
  70 /** Constructor.
  71 */
  72
  73 mlt_playlist mlt_playlist_init( )
  74 {
  75         mlt_playlist this = calloc( sizeof( struct mlt_playlist_s ), 1 );
  76         if ( this != NULL )
  77         {
  78                 mlt_producer producer = &this->parent;
  79
  80                 // Construct the producer
  81                 mlt_producer_init( producer, this );
  82
  83                 // Override the producer get_frame
  84                 producer->get_frame = producer_get_frame;
  85
  86                 // Define the destructor
  87                 producer->close = ( mlt_destructor )mlt_playlist_close;
  88                 producer->close_object = this;
  89
  90                 // Initialise blank
  91                 mlt_producer_init( &this->blank, NULL );
  92                 mlt_properties_set( mlt_producer_properties( &this->blank ), "mlt_service", "blank" );
  93                 mlt_properties_set( mlt_producer_properties( &this->blank ), "resource", "blank" );
  94
  95                 // Indicate that this producer is a playlist
  96                 mlt_properties_set_data( mlt_playlist_properties( this ), "playlist", this, 0, NULL, NULL );
  97
  98                 // Specify the eof condition
  99                 mlt_properties_set( mlt_playlist_properties( this ), "eof", "pause" );
 100                 mlt_properties_set( mlt_playlist_properties( this ), "resource", "<playlist>" );
 101                 mlt_properties_set( mlt_playlist_properties( this ), "mlt_type", "mlt_producer" );
 102                 mlt_properties_set_position( mlt_playlist_properties( this ), "in", 0 );
 103                 mlt_properties_set_position( mlt_playlist_properties( this ), "out", 0 );
 104                 mlt_properties_set_position( mlt_playlist_properties( this ), "length", 0 );
 105
 106                 this->size = 10;
 107                 this->list = malloc( this->size * sizeof( playlist_entry * ) );
 108         }
 109
 110         return this;
 111 }
 112
 113 /** Get the producer associated to this playlist.
 114 */
 115
 116 mlt_producer mlt_playlist_producer( mlt_playlist this )
 117 {
 118         return this != NULL ? &this->parent : NULL;
 119 }
 120
 121 /** Get the service associated to this playlist.
 122 */
 123
 124 mlt_service mlt_playlist_service( mlt_playlist this )
 125 {
 126         return mlt_producer_service( &this->parent );
 127 }
 128
 129 /** Get the propertues associated to this playlist.
 130 */
 131
 132 mlt_properties mlt_playlist_properties( mlt_playlist this )
 133 {
 134         return mlt_producer_properties( &this->parent );
 135 }
 136
 137 /** Refresh the playlist after a clip has been changed.
 138 */
 139
 140 static int mlt_playlist_virtual_refresh( mlt_playlist this )
 141 {
 142         // Obtain the properties
 143         mlt_properties properties = mlt_playlist_properties( this );
 144
 145         // Get the fps of the first producer
 146         double fps = mlt_properties_get_double( properties, "first_fps" );
 147         int i = 0;
 148         mlt_position frame_count = 0;
 149
 150         for ( i = 0; i < this->count; i ++ )
 151         {
 152                 // Get the producer
 153                 mlt_producer producer = this->list[ i ]->producer;
 154                 int current_length = mlt_producer_get_out( producer ) - mlt_producer_get_in( producer ) + 1;
 155
 156                 // If fps is 0
 157                 if ( fps == 0 )
 158                 {
 159                         // Inherit it from the producer
 160                         fps = mlt_producer_get_fps( producer );
 161                 }
 162                 else if ( fps != mlt_properties_get_double( mlt_producer_properties( producer ), "fps" ) )
 163                 {
 164                         // Generate a warning for now - the following attempt to fix may fail
 165                         fprintf( stderr, "Warning: fps mismatch on playlist producer %d\n", this->count );
 166
 167                         // It should be safe to impose fps on an image producer, but not necessarily safe for video
 168                         mlt_properties_set_double( mlt_producer_properties( producer ), "fps", fps );
 169                 }
 170
 171                 // Check if the length of the producer has changed
 172                 if ( this->list[ i ]->producer != &this->blank &&
 173                          ( this->list[ i ]->frame_in != mlt_producer_get_in( producer ) ||
 174                            this->list[ i ]->frame_out != mlt_producer_get_out( producer ) ) )
 175                 {
 176                         // This clip should be removed...
 177                         if ( current_length < 1 )
 178                         {
 179                                 this->list[ i ]->frame_in = 0;
 180                                 this->list[ i ]->frame_out = -1;
 181                                 this->list[ i ]->frame_count = 0;
 182                         }
 183                         else
 184                         {
 185                                 this->list[ i ]->frame_in = mlt_producer_get_in( producer );
 186                                 this->list[ i ]->frame_out = mlt_producer_get_out( producer );
 187                                 this->list[ i ]->frame_count = current_length;
 188                         }
 189
 190                         // Update the producer_length
 191                         this->list[ i ]->producer_length = current_length;
 192                 }
 193
 194                 // Calculate the frame_count
 195                 this->list[ i ]->frame_count = ( this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1 ) * this->list[ i ]->repeat;
 196
 197                 // Update the frame_count for this clip
 198                 frame_count += this->list[ i ]->frame_count;
 199         }
 200
 201         // Refresh all properties
 202         mlt_properties_set_double( properties, "first_fps", fps );
 203         mlt_properties_set_double( properties, "fps", fps == 0 ? 25 : fps );
 204         mlt_events_block( properties, properties );
 205         mlt_properties_set_position( properties, "length", frame_count );
 206         mlt_events_unblock( properties, properties );
 207         mlt_properties_set_position( properties, "out", frame_count - 1 );
 208
 209         return 0;
 210 }
 211
 212 /** Listener for producers on the playlist.
 213 */
 214
 215 static void mlt_playlist_listener( mlt_producer producer, mlt_playlist this )
 216 {
 217         mlt_playlist_virtual_refresh( this );
 218 }
 219
 220 /** Append to the virtual playlist.
 221 */
 222
 223 static int mlt_playlist_virtual_append( mlt_playlist this, mlt_producer source, mlt_position in, mlt_position out )
 224 {
 225         char *resource = source != NULL ? mlt_properties_get( mlt_producer_properties( source ), "resource" ) : NULL;
 226         mlt_producer producer = NULL;
 227         mlt_properties properties = NULL;
 228         mlt_properties parent = NULL;
 229
 230         // If we have a cut, then use the in/out points from the cut
 231         if ( resource == NULL || !strcmp( resource, "blank" ) )
 232         {
 233                 producer = &this->blank;
 234                 properties = mlt_producer_properties( producer );
 235                 mlt_properties_inc_ref( properties );
 236         }
 237         else if ( mlt_producer_is_cut( source ) )
 238         {
 239                 producer = source;
 240                 if ( in == -1 )
 241                         in = mlt_producer_get_in( producer );
 242                 if ( out == -1 || out > mlt_producer_get_out( producer ) )
 243                         out = mlt_producer_get_out( producer );
 244                 properties = mlt_producer_properties( producer );
 245                 mlt_properties_inc_ref( properties );
 246         }
 247         else
 248         {
 249                 producer = mlt_producer_cut( source, in, out );
 250                 if ( in == -1 || in < mlt_producer_get_in( producer ) )
 251                         in = mlt_producer_get_in( producer );
 252                 if ( out == -1 || out > mlt_producer_get_out( producer ) )
 253                         out = mlt_producer_get_out( producer );
 254                 properties = mlt_producer_properties( producer );
 255         }
 256
 257         // Fetch the cuts parent properties
 258         parent = mlt_producer_properties( mlt_producer_cut_parent( producer ) );
 259
 260         // Check that we have room
 261         if ( this->count >= this->size )
 262         {
 263                 int i;
 264                 this->list = realloc( this->list, ( this->size + 10 ) * sizeof( playlist_entry * ) );
 265                 for ( i = this->size; i < this->size + 10; i ++ ) this->list[ i ] = NULL;
 266                 this->size += 10;
 267         }
 268
 269         // Create the entry
 270         this->list[ this->count ] = calloc( sizeof( playlist_entry ), 1 );
 271         if ( this->list[ this->count ] != NULL )
 272         {
 273                 this->list[ this->count ]->producer = producer;
 274                 this->list[ this->count ]->frame_in = in;
 275                 this->list[ this->count ]->frame_out = out;
 276                 this->list[ this->count ]->frame_count = out - in + 1;
 277                 this->list[ this->count ]->repeat = 1;
 278                 this->list[ this->count ]->producer_length = mlt_producer_get_out( producer ) - mlt_producer_get_in( producer ) + 1;
 279                 this->list[ this->count ]->event = mlt_events_listen( parent, this, "producer-changed", ( mlt_listener )mlt_playlist_listener );
 280                 mlt_event_inc_ref( this->list[ this->count ]->event );
 281                 mlt_properties_set( properties, "eof", "pause" );
 282                 mlt_producer_set_speed( producer, 0 );
 283                 this->count ++;
 284         }
 285
 286         return mlt_playlist_virtual_refresh( this );
 287 }
 288
 289 /** Seek in the virtual playlist.
 290 */
 291
 292 static mlt_service mlt_playlist_virtual_seek( mlt_playlist this )
 293 {
 294         // Default producer to blank
 295         mlt_producer producer = NULL;
 296
 297         // Map playlist position to real producer in virtual playlist
 298         mlt_position position = mlt_producer_frame( &this->parent );
 299
 300         mlt_position original = position;
 301
 302         // Total number of frames
 303         int64_t total = 0;
 304
 305         // Get the properties
 306         mlt_properties properties = mlt_playlist_properties( this );
 307
 308         // Get the eof handling
 309         char *eof = mlt_properties_get( properties, "eof" );
 310
 311         // Index for the main loop
 312         int i = 0;
 313
 314         // Loop for each producer until found
 315         for ( i = 0; i < this->count; i ++ )
 316         {
 317                 // Increment the total
 318                 total += this->list[ i ]->frame_count;
 319
 320                 // Check if the position indicates that we have found the clip
 321                 // Note that 0 length clips get skipped automatically
 322                 if ( position < this->list[ i ]->frame_count )
 323                 {
 324                         // Found it, now break
 325                         producer = this->list[ i ]->producer;
 326                         break;
 327                 }
 328                 else
 329                 {
 330                         // Decrement position by length of this entry
 331                         position -= this->list[ i ]->frame_count;
 332                 }
 333         }
 334
 335         // Seek in real producer to relative position
 336         if ( producer != NULL )
 337         {
 338                 int count = this->list[ i ]->frame_count / this->list[ i ]->repeat;
 339                 mlt_producer_seek( producer, position % count );
 340         }
 341         else if ( !strcmp( eof, "pause" ) && total > 0 )
 342         {
 343                 playlist_entry *entry = this->list[ this->count - 1 ];
 344                 mlt_producer this_producer = mlt_playlist_producer( this );
 345                 mlt_producer_seek( this_producer, original - 1 );
 346                 producer = entry->producer;
 347                 mlt_producer_seek( producer, entry->frame_out );
 348                 mlt_producer_set_speed( this_producer, 0 );
 349                 mlt_producer_set_speed( producer, 0 );
 350         }
 351         else if ( !strcmp( eof, "loop" ) && total > 0 )
 352         {
 353                 playlist_entry *entry = this->list[ 0 ];
 354                 mlt_producer this_producer = mlt_playlist_producer( this );
 355                 mlt_producer_seek( this_producer, 0 );
 356                 producer = entry->producer;
 357                 mlt_producer_seek( producer, 0 );
 358         }
 359         else
 360         {
 361                 producer = &this->blank;
 362         }
 363
 364         return mlt_producer_service( producer );
 365 }
 366
 367 /** Invoked when a producer indicates that it has prematurely reached its end.
 368 */
 369
 370 static mlt_producer mlt_playlist_virtual_set_out( mlt_playlist this )
 371 {
 372         // Default producer to blank
 373         mlt_producer producer = &this->blank;
 374
 375         // Map playlist position to real producer in virtual playlist
 376         mlt_position position = mlt_producer_frame( &this->parent );
 377
 378         // Loop through the virtual playlist
 379         int i = 0;
 380
 381         for ( i = 0; i < this->count; i ++ )
 382         {
 383                 if ( position < this->list[ i ]->frame_count )
 384                 {
 385                         // Found it, now break
 386                         producer = this->list[ i ]->producer;
 387                         break;
 388                 }
 389                 else
 390                 {
 391                         // Decrement position by length of this entry
 392                         position -= this->list[ i ]->frame_count;
 393                 }
 394         }
 395
 396         // Seek in real producer to relative position
 397         if ( i < this->count && this->list[ i ]->frame_out != position )
 398         {
 399                 // Update the frame_count for the changed clip (hmmm)
 400                 this->list[ i ]->frame_out = position;
 401                 this->list[ i ]->frame_count = this->list[ i ]->frame_out - this->list[ i ]->frame_in + 1;
 402
 403                 // Refresh the playlist
 404                 mlt_playlist_virtual_refresh( this );
 405         }
 406
 407         return producer;
 408 }
 409
 410 /** Obtain the current clips index.
 411 */
 412
 413 int mlt_playlist_current_clip( mlt_playlist this )
 414 {
 415         // Map playlist position to real producer in virtual playlist
 416         mlt_position position = mlt_producer_frame( &this->parent );
 417
 418         // Loop through the virtual playlist
 419         int i = 0;
 420
 421         for ( i = 0; i < this->count; i ++ )
 422         {
 423                 if ( position < this->list[ i ]->frame_count )
 424                 {
 425                         // Found it, now break
 426                         break;
 427                 }
 428                 else
 429                 {
 430                         // Decrement position by length of this entry
 431                         position -= this->list[ i ]->frame_count;
 432                 }
 433         }
 434
 435         return i;
 436 }
 437
 438 /** Obtain the current clips producer.
 439 */
 440
 441 mlt_producer mlt_playlist_current( mlt_playlist this )
 442 {
 443         int i = mlt_playlist_current_clip( this );
 444         if ( i < this->count )
 445                 return this->list[ i ]->producer;
 446         else
 447                 return &this->blank;
 448 }
 449
 450 /** Get the position which corresponds to the start of the next clip.
 451 */
 452
 453 mlt_position mlt_playlist_clip( mlt_playlist this, mlt_whence whence, int index )
 454 {
 455         mlt_position position = 0;
 456         int absolute_clip = index;
 457         int i = 0;
 458
 459         // Determine the absolute clip
 460         switch ( whence )
 461         {
 462                 case mlt_whence_relative_start:
 463                         absolute_clip = index;
 464                         break;
 465
 466                 case mlt_whence_relative_current:
 467                         absolute_clip = mlt_playlist_current_clip( this ) + index;
 468                         break;
 469
 470                 case mlt_whence_relative_end:
 471                         absolute_clip = this->count - index;
 472                         break;
 473         }
 474
 475         // Check that we're in a valid range
 476         if ( absolute_clip < 0 )
 477                 absolute_clip = 0;
 478         else if ( absolute_clip > this->count )
 479                 absolute_clip = this->count;
 480
 481         // Now determine the position
 482         for ( i = 0; i < absolute_clip; i ++ )
 483                 position += this->list[ i ]->frame_count;
 484
 485         return position;
 486 }
 487
 488 /** Get all the info about the clip specified.
 489 */
 490
 491 int mlt_playlist_get_clip_info( mlt_playlist this, mlt_playlist_clip_info *info, int index )
 492 {
 493         int error = index < 0 || index >= this->count;
 494         memset( info, 0, sizeof( mlt_playlist_clip_info ) );
 495         if ( !error )
 496         {
 497                 mlt_producer producer = mlt_producer_cut_parent( this->list[ index ]->producer );
 498                 mlt_properties properties = mlt_producer_properties( producer );
 499                 info->clip = index;
 500                 info->producer = producer;
 501                 info->cut = this->list[ index ]->producer;
 502                 info->start = mlt_playlist_clip( this, mlt_whence_relative_start, index );
 503                 info->resource = mlt_properties_get( properties, "resource" );
 504                 info->frame_in = this->list[ index ]->frame_in;
 505                 info->frame_out = this->list[ index ]->frame_out;
 506                 info->frame_count = this->list[ index ]->frame_count;
 507                 info->repeat = this->list[ index ]->repeat;
 508                 info->length = mlt_producer_get_length( producer );
 509                 info->fps = mlt_producer_get_fps( producer );
 510         }
 511
 512         return error;
 513 }
 514
 515 /** Get number of clips in the playlist.
 516 */
 517
 518 int mlt_playlist_count( mlt_playlist this )
 519 {
 520         return this->count;
 521 }
 522
 523 /** Clear the playlist.
 524 */
 525
 526 int mlt_playlist_clear( mlt_playlist this )
 527 {
 528         int i;
 529         for ( i = 0; i < this->count; i ++ )
 530         {
 531                 mlt_event_close( this->list[ i ]->event );
 532                 mlt_producer_close( this->list[ i ]->producer );
 533         }
 534         this->count = 0;
 535         mlt_properties_set_double( mlt_playlist_properties( this ), "first_fps", 0 );
 536         return mlt_playlist_virtual_refresh( this );
 537 }
 538
 539 /** Append a producer to the playlist.
 540 */
 541
 542 int mlt_playlist_append( mlt_playlist this, mlt_producer producer )
 543 {
 544         // Append to virtual list
 545         return mlt_playlist_virtual_append( this, producer, 0, mlt_producer_get_playtime( producer ) - 1 );
 546 }
 547
 548 /** Append a producer to the playlist with in/out points.
 549 */
 550
 551 int mlt_playlist_append_io( mlt_playlist this, mlt_producer producer, mlt_position in, mlt_position out )
 552 {
 553         // Append to virtual list
 554         if ( in != -1 && out != -1 )
 555                 return mlt_playlist_virtual_append( this, producer, in, out );
 556         else
 557                 return mlt_playlist_append( this, producer );
 558 }
 559
 560 /** Append a blank to the playlist of a given length.
 561 */
 562
 563 int mlt_playlist_blank( mlt_playlist this, mlt_position length )
 564 {
 565         // Append to the virtual list
 566         return mlt_playlist_virtual_append( this, &this->blank, 0, length );
 567 }
 568
 569 /** Insert a producer into the playlist.
 570 */
 571
 572 int mlt_playlist_insert( mlt_playlist this, mlt_producer producer, int where, mlt_position in, mlt_position out )
 573 {
 574         // Append to end
 575         mlt_events_block( mlt_playlist_properties( this ), this );
 576         mlt_playlist_append_io( this, producer, in, out );
 577
 578         // Move to the position specified
 579         mlt_playlist_move( this, this->count - 1, where );
 580         mlt_events_unblock( mlt_playlist_properties( this ), this );
 581
 582         return mlt_playlist_virtual_refresh( this );
 583 }
 584
 585 /** Remove an entry in the playlist.
 586 */
 587
 588 int mlt_playlist_remove( mlt_playlist this, int where )
 589 {
 590         int error = where < 0 || where >= this->count;
 591         if ( error == 0 && mlt_playlist_unmix( this, where ) != 0 )
 592         {
 593                 // We need to know the current clip and the position within the playlist
 594                 int current = mlt_playlist_current_clip( this );
 595                 mlt_position position = mlt_producer_position( mlt_playlist_producer( this ) );
 596
 597                 // We need all the details about the clip we're removing
 598                 mlt_playlist_clip_info where_info;
 599                 playlist_entry *entry = this->list[ where ];
 600                 mlt_properties properties = mlt_producer_properties( entry->producer );
 601
 602                 // Loop variable
 603                 int i = 0;
 604
 605                 // Get the clip info
 606                 mlt_playlist_get_clip_info( this, &where_info, where );
 607
 608                 // Make sure the clip to be removed is valid and correct if necessary
 609                 if ( where < 0 )
 610                         where = 0;
 611                 if ( where >= this->count )
 612                         where = this->count - 1;
 613
 614                 // Reorganise the list
 615                 for ( i = where + 1; i < this->count; i ++ )
 616                         this->list[ i - 1 ] = this->list[ i ];
 617                 this->count --;
 618
 619                 if ( entry->preservation_hack == 0 )
 620                 {
 621                         // Decouple from mix_in/out if necessary
 622                         if ( mlt_properties_get_data( properties, "mix_in", NULL ) != NULL )
 623                         {
 624                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_in", NULL );
 625                                 mlt_properties_set_data( mix, "mix_out", NULL, 0, NULL, NULL );
 626                         }
 627                         if ( mlt_properties_get_data( properties, "mix_out", NULL ) != NULL )
 628                         {
 629                                 mlt_properties mix = mlt_properties_get_data( properties, "mix_out", NULL );
 630                                 mlt_properties_set_data( mix, "mix_in", NULL, 0, NULL, NULL );
 631                         }
 632
 633                         mlt_producer_clear( entry->producer );
 634                 }
 635
 636                 // Close the producer associated to the clip info
 637                 mlt_event_close( entry->event );
 638                 mlt_producer_close( entry->producer );
 639
 640                 // Correct position
 641                 if ( where == current )
 642                         mlt_producer_seek( mlt_playlist_producer( this ), where_info.start );
 643                 else if ( where < current && this->count > 0 )
 644                         mlt_producer_seek( mlt_playlist_producer( this ), position - where_info.frame_count );
 645                 else if ( this->count == 0 )
 646                         mlt_producer_seek( mlt_playlist_producer( this ), 0 );
 647
 648                 // Free the entry
 649                 free( entry );
 650
 651                 // Refresh the playlist
 652                 mlt_playlist_virtual_refresh( this );
 653         }
 654
 655         return error;
 656 }
 657
 658 /** Move an entry in the playlist.
 659 */
 660
 661 int mlt_playlist_move( mlt_playlist this, int src, int dest )
 662 {
 663         int i;
 664
 665         /* We need to ensure that the requested indexes are valid and correct it as necessary */
 666         if ( src < 0 )
 667                 src = 0;
 668         if ( src >= this->count )
 669                 src = this->count - 1;
 670
 671         if ( dest < 0 )
 672                 dest = 0;
 673         if ( dest >= this->count )
 674                 dest = this->count - 1;
 675
 676         if ( src != dest && this->count > 1 )
 677         {
 678                 int current = mlt_playlist_current_clip( this );
 679                 mlt_position position = mlt_producer_position( mlt_playlist_producer( this ) );
 680                 playlist_entry *src_entry = NULL;
 681
 682                 // We need all the details about the current clip
 683                 mlt_playlist_clip_info current_info;
 684
 685                 mlt_playlist_get_clip_info( this, &current_info, current );
 686                 position -= current_info.start;
 687
 688                 if ( current == src )
 689                         current = dest;
 690                 else if ( current > src && current < dest )
 691                         current ++;
 692                 else if ( current == dest )
 693                         current = src;
 694
 695                 src_entry = this->list[ src ];
 696                 if ( src > dest )
 697                 {
 698                         for ( i = src; i > dest; i -- )
 699                                 this->list[ i ] = this->list[ i - 1 ];
 700                 }
 701                 else
 702                 {
 703                         for ( i = src; i < dest; i ++ )
 704                                 this->list[ i ] = this->list[ i + 1 ];
 705                 }
 706                 this->list[ dest ] = src_entry;
 707
 708                 mlt_playlist_get_clip_info( this, &current_info, current );
 709                 mlt_producer_seek( mlt_playlist_producer( this ), current_info.start + position );
 710                 mlt_playlist_virtual_refresh( this );
 711         }
 712
 713         return 0;
 714 }
 715
 716 /** Repeat the specified clip n times.
 717 */
 718
 719 int mlt_playlist_repeat_clip( mlt_playlist this, int clip, int repeat )
 720 {
 721         int error = repeat < 1 || clip < 0 || clip >= this->count;
 722         if ( error == 0 )
 723         {
 724                 playlist_entry *entry = this->list[ clip ];
 725                 entry->repeat = repeat;
 726                 mlt_playlist_virtual_refresh( this );
 727         }
 728         return error;
 729 }
 730
 731 /** Resize the specified clip.
 732 */
 733
 734 int mlt_playlist_resize_clip( mlt_playlist this, int clip, mlt_position in, mlt_position out )
 735 {
 736         int error = clip < 0 || clip >= this->count;
 737         if ( error == 0 && mlt_playlist_resize_mix( this, clip, in, out ) != 0 )
 738         {
 739                 playlist_entry *entry = this->list[ clip ];
 740                 mlt_producer producer = entry->producer;
 741
 742                 if ( in <= -1 )
 743                         in = 0;
 744                 if ( out <= -1 || out >= mlt_producer_get_length( producer ) )
 745                         out = mlt_producer_get_length( producer ) - 1;
 746
 747                 if ( out < in )
 748                 {
 749                         mlt_position t = in;
 750                         in = out;
 751                         out = t;
 752                 }
 753
 754                 mlt_producer_set_in_and_out( producer, in, out );
 755         }
 756         return error;
 757 }
 758
 759 /** Split a clip on the playlist at the given position.
 760 */
 761
 762 int mlt_playlist_split( mlt_playlist this, int clip, mlt_position position )
 763 {
 764         int error = clip < 0 || clip >= this->count;
 765         if ( error == 0 )
 766         {
 767                 playlist_entry *entry = this->list[ clip ];
 768                 if ( position >= 0 && position < entry->frame_count )
 769                 {
 770                         mlt_producer split = NULL;
 771                         int in = entry->frame_in;
 772                         int out = entry->frame_out;
 773                         mlt_events_block( mlt_playlist_properties( this ), this );
 774                         mlt_playlist_resize_clip( this, clip, in, in + position );
 775                         split = mlt_producer_cut( entry->producer, in + position + 1, out );
 776                         mlt_playlist_insert( this, split, clip + 1, 0, -1 );
 777                         mlt_producer_close( split );
 778                         mlt_events_unblock( mlt_playlist_properties( this ), this );
 779                         mlt_events_fire( mlt_playlist_properties( this ), "producer-changed", NULL );
 780                 }
 781                 else
 782                 {
 783                         error = 1;
 784                 }
 785         }
 786         return error;
 787 }
 788
 789 /** Join 1 or more consecutive clips.
 790 */
 791
 792 int mlt_playlist_join( mlt_playlist this, int clip, int count, int merge )
 793 {
 794         int error = clip < 0 || ( clip ) >= this->count;
 795         if ( error == 0 )
 796         {
 797                 int i = clip;
 798                 mlt_playlist new_clip = mlt_playlist_init( );
 799                 mlt_events_block( mlt_playlist_properties( this ), this );
 800                 if ( clip + count >= this->count )
 801                         count = this->count - clip;
 802                 for ( i = 0; i <= count; i ++ )
 803                 {
 804                         playlist_entry *entry = this->list[ clip ];
 805                         mlt_playlist_append( new_clip, entry->producer );
 806                         mlt_playlist_repeat_clip( new_clip, i, entry->repeat );
 807                         entry->preservation_hack = 1;
 808                         mlt_playlist_remove( this, clip );
 809                 }
 810                 mlt_events_unblock( mlt_playlist_properties( this ), this );
 811                 mlt_playlist_insert( this, mlt_playlist_producer( new_clip ), clip, 0, -1 );
 812                 mlt_playlist_close( new_clip );
 813         }
 814         return error;
 815 }
 816
 817 /** Mix consecutive clips for a specified length and apply transition if specified.
 818 */
 819
 820 int mlt_playlist_mix( mlt_playlist this, int clip, int length, mlt_transition transition )
 821 {
 822         int error = ( clip < 0 || clip + 1 >= this->count );
 823         if ( error == 0 )
 824         {
 825                 playlist_entry *clip_a = this->list[ clip ];
 826                 playlist_entry *clip_b = this->list[ clip + 1 ];
 827                 mlt_producer track_a;
 828                 mlt_producer track_b;
 829                 mlt_tractor tractor = mlt_tractor_new( );
 830                 mlt_events_block( mlt_playlist_properties( this ), this );
 831
 832                 // TODO: Check length is valid for both clips and resize if necessary.
 833
 834                 // Create the a and b tracks/cuts
 835                 track_a = mlt_producer_cut( clip_a->producer, clip_a->frame_out - length + 1, clip_a->frame_out );
 836                 track_b = mlt_producer_cut( clip_b->producer, clip_b->frame_in, clip_b->frame_in + length - 1 );
 837
 838                 // Set the tracks on the tractor
 839                 mlt_tractor_set_track( tractor, track_a, 0 );
 840                 mlt_tractor_set_track( tractor, track_b, 1 );
 841
 842                 // Insert the mix object into the playlist
 843                 mlt_playlist_insert( this, mlt_tractor_producer( tractor ), clip + 1, -1, -1 );
 844                 mlt_properties_set_data( mlt_tractor_properties( tractor ), "mlt_mix", tractor, 0, NULL, NULL );
 845
 846                 // Attach the transition
 847                 if ( transition != NULL )
 848                 {
 849                         mlt_field field = mlt_tractor_field( tractor );
 850                         mlt_field_plant_transition( field, transition, 0, 1 );
 851                         mlt_transition_set_in_and_out( transition, 0, length - 1 );
 852                 }
 853
 854                 // Check if we have anything left on the right hand clip
 855                 if ( clip_b->frame_out - clip_b->frame_in > length )
 856                 {
 857                         mlt_playlist_resize_clip( this, clip + 2, clip_b->frame_in + length, clip_b->frame_out );
 858                         mlt_properties_set_data( mlt_producer_properties( clip_b->producer ), "mix_in", tractor, 0, NULL, NULL );
 859                         mlt_properties_set_data( mlt_tractor_properties( tractor ), "mix_out", clip_b->producer, 0, NULL, NULL );
 860                 }
 861                 else
 862                 {
 863                         mlt_producer_clear( clip_b->producer );
 864                         mlt_playlist_remove( this, clip + 2 );
 865                 }
 866
 867                 // Check if we have anything left on the left hand clip
 868                 if ( clip_a->frame_out - clip_a->frame_in > length )
 869                 {
 870                         mlt_playlist_resize_clip( this, clip, clip_a->frame_in, clip_a->frame_out - length );
 871                         mlt_properties_set_data( mlt_producer_properties( clip_a->producer ), "mix_out", tractor, 0, NULL, NULL );
 872                         mlt_properties_set_data( mlt_tractor_properties( tractor ), "mix_in", clip_a->producer, 0, NULL, NULL );
 873                 }
 874                 else
 875                 {
 876                         mlt_producer_clear( clip_a->producer );
 877                         mlt_playlist_remove( this, clip );
 878                 }
 879
 880                 mlt_events_unblock( mlt_playlist_properties( this ), this );
 881                 mlt_events_fire( mlt_playlist_properties( this ), "producer-changed", NULL );
 882                 mlt_producer_close( track_a );
 883                 mlt_producer_close( track_b );
 884                 mlt_tractor_close( tractor );
 885         }
 886         return error;
 887 }
 888
 889 /** Add a transition to an existing mix.
 890 */
 891
 892 int mlt_playlist_mix_add( mlt_playlist this, int clip, mlt_transition transition )
 893 {
 894         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
 895         mlt_properties properties = producer != NULL ? mlt_producer_properties( producer ) : NULL;
 896         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
 897         int error = transition == NULL || tractor == NULL;
 898         if ( error == 0 )
 899         {
 900                 mlt_field field = mlt_tractor_field( tractor );
 901                 mlt_field_plant_transition( field, transition, 0, 1 );
 902                 mlt_transition_set_in_and_out( transition, 0, this->list[ clip ]->frame_count - 1 );
 903         }
 904         return error;
 905 }
 906
 907 /** Return the clip at the position.
 908 */
 909
 910 mlt_producer mlt_playlist_get_clip( mlt_playlist this, int clip )
 911 {
 912         if ( clip >= 0 && clip < this->count )
 913                 return this->list[ clip ]->producer;
 914         return NULL;
 915 }
 916
 917 /** Determine if the clip is a mix.
 918 */
 919
 920 int mlt_playlist_clip_is_mix( mlt_playlist this, int clip )
 921 {
 922         mlt_producer producer = mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip ) );
 923         mlt_properties properties = producer != NULL ? mlt_producer_properties( producer ) : NULL;
 924         mlt_tractor tractor = properties != NULL ? mlt_properties_get_data( properties, "mlt_mix", NULL ) : NULL;
 925         return tractor != NULL;
 926 }
 927
 928 /** Remove a mixed clip - ensure that the cuts included in the mix find their way
 929         back correctly on to the playlist.
 930 */
 931
 932 static int mlt_playlist_unmix( mlt_playlist this, int clip )
 933 {
 934         int error = ( clip < 0 || clip >= this->count );
 935
 936         // Ensure that the clip request is actually a mix
 937         if ( error == 0 )
 938         {
 939                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
 940                 mlt_properties properties = mlt_producer_properties( producer );
 941                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL;
 942         }
 943
 944         if ( error == 0 )
 945         {
 946                 playlist_entry *mix = this->list[ clip ];
 947                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
 948                 mlt_properties properties = mlt_tractor_properties( tractor );
 949                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
 950                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
 951                 int length = mlt_producer_get_playtime( mlt_tractor_producer( tractor ) );
 952                 mlt_events_block( mlt_playlist_properties( this ), this );
 953
 954                 if ( clip_a != NULL )
 955                 {
 956                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) + length );
 957                 }
 958                 else
 959                 {
 960                         mlt_producer cut = mlt_tractor_get_track( tractor, 0 );
 961                         mlt_playlist_insert( this, cut, clip, -1, -1 );
 962                         clip ++;
 963                 }
 964
 965                 if ( clip_b != NULL )
 966                 {
 967                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) - length, mlt_producer_get_out( clip_b ) );
 968                 }
 969                 else
 970                 {
 971                         mlt_producer cut = mlt_tractor_get_track( tractor, 1 );
 972                         mlt_playlist_insert( this, cut, clip + 1, -1, -1 );
 973                 }
 974
 975                 mlt_properties_set_data( properties, "mlt_mix", NULL, 0, NULL, NULL );
 976                 mlt_playlist_remove( this, clip );
 977                 mlt_events_unblock( mlt_playlist_properties( this ), this );
 978                 mlt_events_fire( mlt_playlist_properties( this ), "producer-changed", NULL );
 979         }
 980         return error;
 981 }
 982
 983 static int mlt_playlist_resize_mix( mlt_playlist this, int clip, int in, int out )
 984 {
 985         int error = ( clip < 0 || clip >= this->count );
 986
 987         // Ensure that the clip request is actually a mix
 988         if ( error == 0 )
 989         {
 990                 mlt_producer producer = mlt_producer_cut_parent( this->list[ clip ]->producer );
 991                 mlt_properties properties = mlt_producer_properties( producer );
 992                 error = mlt_properties_get_data( properties, "mlt_mix", NULL ) == NULL;
 993         }
 994
 995         if ( error == 0 )
 996         {
 997                 playlist_entry *mix = this->list[ clip ];
 998                 mlt_tractor tractor = ( mlt_tractor )mlt_producer_cut_parent( mix->producer );
 999                 mlt_properties properties = mlt_tractor_properties( tractor );
1000                 mlt_producer clip_a = mlt_properties_get_data( properties, "mix_in", NULL );
1001                 mlt_producer clip_b = mlt_properties_get_data( properties, "mix_out", NULL );
1002                 mlt_producer track_a = mlt_tractor_get_track( tractor, 0 );
1003                 mlt_producer track_b = mlt_tractor_get_track( tractor, 1 );
1004                 int length = out - in + 1;
1005                 int length_diff = length - mlt_producer_get_playtime( mlt_tractor_producer( tractor ) );
1006                 mlt_events_block( mlt_playlist_properties( this ), this );
1007
1008                 if ( clip_a != NULL )
1009                         mlt_producer_set_in_and_out( clip_a, mlt_producer_get_in( clip_a ), mlt_producer_get_out( clip_a ) - length_diff );
1010
1011                 if ( clip_b != NULL )
1012                         mlt_producer_set_in_and_out( clip_b, mlt_producer_get_in( clip_b ) + length_diff, mlt_producer_get_out( clip_b ) );
1013
1014                 mlt_producer_set_in_and_out( track_a, mlt_producer_get_in( track_a ) - length_diff, mlt_producer_get_out( track_a ) );
1015                 mlt_producer_set_in_and_out( track_b, mlt_producer_get_in( track_b ), mlt_producer_get_out( track_b ) + length_diff );
1016                 mlt_producer_set_in_and_out( mlt_multitrack_producer( mlt_tractor_multitrack( tractor ) ), in, out );
1017                 mlt_producer_set_in_and_out( mlt_tractor_producer( tractor ), in, out );
1018                 mlt_properties_set_position( mlt_producer_properties( mix->producer ), "length", out - in + 1 );
1019                 mlt_producer_set_in_and_out( mix->producer, in, out );
1020
1021                 mlt_events_unblock( mlt_playlist_properties( this ), this );
1022                 mlt_playlist_virtual_refresh( this );
1023         }
1024         return error;
1025 }
1026
1027 /** Get the current frame.
1028 */
1029
1030 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
1031 {
1032         // Get this mlt_playlist
1033         mlt_playlist this = producer->child;
1034
1035         // Get the real producer
1036         mlt_service real = mlt_playlist_virtual_seek( this );
1037
1038         // Get the frame
1039         mlt_service_get_frame( real, frame, index );
1040
1041         // Check if we're at the end of the clip
1042         mlt_properties properties = mlt_frame_properties( *frame );
1043         if ( mlt_properties_get_int( properties, "end_of_clip" ) )
1044                 mlt_playlist_virtual_set_out( this );
1045
1046         // Check for notifier and call with appropriate argument
1047         mlt_properties playlist_properties = mlt_producer_properties( producer );
1048         void ( *notifier )( void * ) = mlt_properties_get_data( playlist_properties, "notifier", NULL );
1049         if ( notifier != NULL )
1050         {
1051                 void *argument = mlt_properties_get_data( playlist_properties, "notifier_arg", NULL );
1052                 notifier( argument );
1053         }
1054
1055         // Update position on the frame we're creating
1056         mlt_frame_set_position( *frame, mlt_producer_frame( producer ) );
1057
1058         // Position ourselves on the next frame
1059         mlt_producer_prepare_next( producer );
1060
1061         return 0;
1062 }
1063
1064 /** Close the playlist.
1065 */
1066
1067 void mlt_playlist_close( mlt_playlist this )
1068 {
1069         if ( this != NULL && mlt_properties_dec_ref( mlt_playlist_properties( this ) ) <= 0 )
1070         {
1071                 int i = 0;
1072                 this->parent.close = NULL;
1073                 for ( i = 0; i < this->count; i ++ )
1074                 {
1075                         mlt_event_close( this->list[ i ]->event );
1076                         mlt_producer_close( this->list[ i ]->producer );
1077                         free( this->list[ i ] );
1078                 }
1079                 mlt_producer_close( &this->blank );
1080                 mlt_producer_close( &this->parent );
1081                 free( this->list );
1082                 free( this );
1083         }
1084 }