2 * mlt_playlist.c -- playlist service class
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
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"
34 /** Virtual playlist entry.
37 typedef struct playlist_entry_s
39 mlt_producer producer
;
40 mlt_position frame_in
;
41 mlt_position frame_out
;
42 mlt_position frame_count
;
44 mlt_position producer_length
;
46 int preservation_hack
;
50 /** Private definition.
55 struct mlt_producer_s parent
;
56 struct mlt_producer_s blank
;
60 playlist_entry
**list
;
63 /** Forward declarations
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
);
73 mlt_playlist
mlt_playlist_init( )
75 mlt_playlist
this = calloc( sizeof( struct mlt_playlist_s
), 1 );
78 mlt_producer producer
= &this->parent
;
80 // Construct the producer
81 mlt_producer_init( producer
, this );
83 // Override the producer get_frame
84 producer
->get_frame
= producer_get_frame
;
86 // Define the destructor
87 producer
->close
= ( mlt_destructor
)mlt_playlist_close
;
88 producer
->close_object
= this;
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" );
95 // Indicate that this producer is a playlist
96 mlt_properties_set_data( mlt_playlist_properties( this ), "playlist", this, 0, NULL
, NULL
);
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", -1 );
104 mlt_properties_set_position( mlt_playlist_properties( this ), "length", 0 );
107 this->list
= malloc( this->size
* sizeof( playlist_entry
* ) );
113 /** Get the producer associated to this playlist.
116 mlt_producer
mlt_playlist_producer( mlt_playlist
this )
118 return this != NULL ?
&this->parent
: NULL
;
121 /** Get the service associated to this playlist.
124 mlt_service
mlt_playlist_service( mlt_playlist
this )
126 return mlt_producer_service( &this->parent
);
129 /** Get the propertues associated to this playlist.
132 mlt_properties
mlt_playlist_properties( mlt_playlist
this )
134 return mlt_producer_properties( &this->parent
);
137 /** Refresh the playlist after a clip has been changed.
140 static int mlt_playlist_virtual_refresh( mlt_playlist
this )
142 // Obtain the properties
143 mlt_properties properties
= mlt_playlist_properties( this );
145 // Get the fps of the first producer
146 double fps
= mlt_properties_get_double( properties
, "first_fps" );
148 mlt_position frame_count
= 0;
150 for ( i
= 0; i
< this->count
; i
++ )
153 mlt_producer producer
= this->list
[ i
]->producer
;
154 int current_length
= mlt_producer_get_out( producer
) - mlt_producer_get_in( producer
) + 1;
159 // Inherit it from the producer
160 fps
= mlt_producer_get_fps( producer
);
162 else if ( fps
!= mlt_properties_get_double( mlt_producer_properties( producer
), "fps" ) )
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
);
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
);
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
) ) )
176 // This clip should be removed...
177 if ( current_length
< 1 )
179 this->list
[ i
]->frame_in
= 0;
180 this->list
[ i
]->frame_out
= -1;
181 this->list
[ i
]->frame_count
= 0;
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
;
190 // Update the producer_length
191 this->list
[ i
]->producer_length
= current_length
;
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
;
197 // Update the frame_count for this clip
198 frame_count
+= this->list
[ i
]->frame_count
;
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 );
212 /** Listener for producers on the playlist.
215 static void mlt_playlist_listener( mlt_producer producer
, mlt_playlist
this )
217 mlt_playlist_virtual_refresh( this );
220 /** Append to the virtual playlist.
223 static int mlt_playlist_virtual_append( mlt_playlist
this, mlt_producer source
, mlt_position in
, mlt_position out
)
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
;
230 // If we have a cut, then use the in/out points from the cut
231 if ( resource
== NULL
|| !strcmp( resource
, "blank" ) )
233 producer
= &this->blank
;
234 properties
= mlt_producer_properties( producer
);
235 mlt_properties_inc_ref( properties
);
237 else if ( mlt_producer_is_cut( source
) )
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
);
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
);
257 // Fetch the cuts parent properties
258 parent
= mlt_producer_properties( mlt_producer_cut_parent( producer
) );
260 // Check that we have room
261 if ( this->count
>= this->size
)
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
;
270 this->list
[ this->count
] = calloc( sizeof( playlist_entry
), 1 );
271 if ( this->list
[ this->count
] != NULL
)
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 );
286 return mlt_playlist_virtual_refresh( this );
289 static mlt_producer
mlt_playlist_locate( mlt_playlist
this, mlt_position
*position
, int *clip
, int *total
)
291 // Default producer to NULL
292 mlt_producer producer
= NULL
;
294 // Loop for each producer until found
295 for ( *clip
= 0; *clip
< this->count
; *clip
+= 1 )
297 // Increment the total
298 *total
+= this->list
[ *clip
]->frame_count
;
300 // Check if the position indicates that we have found the clip
301 // Note that 0 length clips get skipped automatically
302 if ( *position
< this->list
[ *clip
]->frame_count
)
304 // Found it, now break
305 producer
= this->list
[ *clip
]->producer
;
310 // Decrement position by length of this entry
311 *position
-= this->list
[ *clip
]->frame_count
;
318 /** Seek in the virtual playlist.
321 static mlt_service
mlt_playlist_virtual_seek( mlt_playlist
this, int *progressive
)
323 // Map playlist position to real producer in virtual playlist
324 mlt_position position
= mlt_producer_frame( &this->parent
);
326 // Keep the original position since we change it while iterating through the list
327 mlt_position original
= position
;
329 // Clip index and total
333 // Locate the producer for the position
334 mlt_producer producer
= mlt_playlist_locate( this, &position
, &i
, &total
);
336 // Get the properties
337 mlt_properties properties
= mlt_playlist_properties( this );
339 // Get the eof handling
340 char *eof
= mlt_properties_get( properties
, "eof" );
342 // Seek in real producer to relative position
343 if ( producer
!= NULL
)
345 int count
= this->list
[ i
]->frame_count
/ this->list
[ i
]->repeat
;
346 *progressive
= count
== 1;
347 mlt_producer_seek( producer
, position
% count
);
349 else if ( !strcmp( eof
, "pause" ) && total
> 0 )
351 playlist_entry
*entry
= this->list
[ this->count
- 1 ];
352 int count
= entry
->frame_count
/ entry
->repeat
;
353 mlt_producer this_producer
= mlt_playlist_producer( this );
354 mlt_producer_seek( this_producer
, original
- 1 );
355 producer
= entry
->producer
;
356 mlt_producer_seek( producer
, entry
->frame_out
% count
);
357 mlt_producer_set_speed( this_producer
, 0 );
358 mlt_producer_set_speed( producer
, 0 );
359 *progressive
= count
== 1;
361 else if ( !strcmp( eof
, "loop" ) && total
> 0 )
363 playlist_entry
*entry
= this->list
[ 0 ];
364 mlt_producer this_producer
= mlt_playlist_producer( this );
365 mlt_producer_seek( this_producer
, 0 );
366 producer
= entry
->producer
;
367 mlt_producer_seek( producer
, 0 );
371 producer
= &this->blank
;
374 return mlt_producer_service( producer
);
377 /** Invoked when a producer indicates that it has prematurely reached its end.
380 static mlt_producer
mlt_playlist_virtual_set_out( mlt_playlist
this )
382 // Default producer to blank
383 mlt_producer producer
= &this->blank
;
385 // Map playlist position to real producer in virtual playlist
386 mlt_position position
= mlt_producer_frame( &this->parent
);
388 // Loop through the virtual playlist
391 for ( i
= 0; i
< this->count
; i
++ )
393 if ( position
< this->list
[ i
]->frame_count
)
395 // Found it, now break
396 producer
= this->list
[ i
]->producer
;
401 // Decrement position by length of this entry
402 position
-= this->list
[ i
]->frame_count
;
406 // Seek in real producer to relative position
407 if ( i
< this->count
&& this->list
[ i
]->frame_out
!= position
)
409 // Update the frame_count for the changed clip (hmmm)
410 this->list
[ i
]->frame_out
= position
;
411 this->list
[ i
]->frame_count
= this->list
[ i
]->frame_out
- this->list
[ i
]->frame_in
+ 1;
413 // Refresh the playlist
414 mlt_playlist_virtual_refresh( this );
420 /** Obtain the current clips index.
423 int mlt_playlist_current_clip( mlt_playlist
this )
425 // Map playlist position to real producer in virtual playlist
426 mlt_position position
= mlt_producer_frame( &this->parent
);
428 // Loop through the virtual playlist
431 for ( i
= 0; i
< this->count
; i
++ )
433 if ( position
< this->list
[ i
]->frame_count
)
435 // Found it, now break
440 // Decrement position by length of this entry
441 position
-= this->list
[ i
]->frame_count
;
448 /** Obtain the current clips producer.
451 mlt_producer
mlt_playlist_current( mlt_playlist
this )
453 int i
= mlt_playlist_current_clip( this );
454 if ( i
< this->count
)
455 return this->list
[ i
]->producer
;
460 /** Get the position which corresponds to the start of the next clip.
463 mlt_position
mlt_playlist_clip( mlt_playlist
this, mlt_whence whence
, int index
)
465 mlt_position position
= 0;
466 int absolute_clip
= index
;
469 // Determine the absolute clip
472 case mlt_whence_relative_start
:
473 absolute_clip
= index
;
476 case mlt_whence_relative_current
:
477 absolute_clip
= mlt_playlist_current_clip( this ) + index
;
480 case mlt_whence_relative_end
:
481 absolute_clip
= this->count
- index
;
485 // Check that we're in a valid range
486 if ( absolute_clip
< 0 )
488 else if ( absolute_clip
> this->count
)
489 absolute_clip
= this->count
;
491 // Now determine the position
492 for ( i
= 0; i
< absolute_clip
; i
++ )
493 position
+= this->list
[ i
]->frame_count
;
498 /** Get all the info about the clip specified.
501 int mlt_playlist_get_clip_info( mlt_playlist
this, mlt_playlist_clip_info
*info
, int index
)
503 int error
= index
< 0 || index
>= this->count
;
504 memset( info
, 0, sizeof( mlt_playlist_clip_info
) );
507 mlt_producer producer
= mlt_producer_cut_parent( this->list
[ index
]->producer
);
508 mlt_properties properties
= mlt_producer_properties( producer
);
510 info
->producer
= producer
;
511 info
->cut
= this->list
[ index
]->producer
;
512 info
->start
= mlt_playlist_clip( this, mlt_whence_relative_start
, index
);
513 info
->resource
= mlt_properties_get( properties
, "resource" );
514 info
->frame_in
= this->list
[ index
]->frame_in
;
515 info
->frame_out
= this->list
[ index
]->frame_out
;
516 info
->frame_count
= this->list
[ index
]->frame_count
;
517 info
->repeat
= this->list
[ index
]->repeat
;
518 info
->length
= mlt_producer_get_length( producer
);
519 info
->fps
= mlt_producer_get_fps( producer
);
525 /** Get number of clips in the playlist.
528 int mlt_playlist_count( mlt_playlist
this )
533 /** Clear the playlist.
536 int mlt_playlist_clear( mlt_playlist
this )
539 for ( i
= 0; i
< this->count
; i
++ )
541 mlt_event_close( this->list
[ i
]->event
);
542 mlt_producer_close( this->list
[ i
]->producer
);
545 mlt_properties_set_double( mlt_playlist_properties( this ), "first_fps", 0 );
546 return mlt_playlist_virtual_refresh( this );
549 /** Append a producer to the playlist.
552 int mlt_playlist_append( mlt_playlist
this, mlt_producer producer
)
554 // Append to virtual list
555 return mlt_playlist_virtual_append( this, producer
, 0, mlt_producer_get_playtime( producer
) - 1 );
558 /** Append a producer to the playlist with in/out points.
561 int mlt_playlist_append_io( mlt_playlist
this, mlt_producer producer
, mlt_position in
, mlt_position out
)
563 // Append to virtual list
564 if ( in
!= -1 && out
!= -1 )
565 return mlt_playlist_virtual_append( this, producer
, in
, out
);
567 return mlt_playlist_append( this, producer
);
570 /** Append a blank to the playlist of a given length.
573 int mlt_playlist_blank( mlt_playlist
this, mlt_position length
)
575 // Append to the virtual list
576 return mlt_playlist_virtual_append( this, &this->blank
, 0, length
);
579 /** Insert a producer into the playlist.
582 int mlt_playlist_insert( mlt_playlist
this, mlt_producer producer
, int where
, mlt_position in
, mlt_position out
)
585 mlt_events_block( mlt_playlist_properties( this ), this );
586 mlt_playlist_append_io( this, producer
, in
, out
);
588 // Move to the position specified
589 mlt_playlist_move( this, this->count
- 1, where
);
590 mlt_events_unblock( mlt_playlist_properties( this ), this );
592 return mlt_playlist_virtual_refresh( this );
595 /** Remove an entry in the playlist.
598 int mlt_playlist_remove( mlt_playlist
this, int where
)
600 int error
= where
< 0 || where
>= this->count
;
601 if ( error
== 0 && mlt_playlist_unmix( this, where
) != 0 )
603 // We need to know the current clip and the position within the playlist
604 int current
= mlt_playlist_current_clip( this );
605 mlt_position position
= mlt_producer_position( mlt_playlist_producer( this ) );
607 // We need all the details about the clip we're removing
608 mlt_playlist_clip_info where_info
;
609 playlist_entry
*entry
= this->list
[ where
];
610 mlt_properties properties
= mlt_producer_properties( entry
->producer
);
616 mlt_playlist_get_clip_info( this, &where_info
, where
);
618 // Make sure the clip to be removed is valid and correct if necessary
621 if ( where
>= this->count
)
622 where
= this->count
- 1;
624 // Reorganise the list
625 for ( i
= where
+ 1; i
< this->count
; i
++ )
626 this->list
[ i
- 1 ] = this->list
[ i
];
629 if ( entry
->preservation_hack
== 0 )
631 // Decouple from mix_in/out if necessary
632 if ( mlt_properties_get_data( properties
, "mix_in", NULL
) != NULL
)
634 mlt_properties mix
= mlt_properties_get_data( properties
, "mix_in", NULL
);
635 mlt_properties_set_data( mix
, "mix_out", NULL
, 0, NULL
, NULL
);
637 if ( mlt_properties_get_data( properties
, "mix_out", NULL
) != NULL
)
639 mlt_properties mix
= mlt_properties_get_data( properties
, "mix_out", NULL
);
640 mlt_properties_set_data( mix
, "mix_in", NULL
, 0, NULL
, NULL
);
643 mlt_producer_clear( entry
->producer
);
646 // Close the producer associated to the clip info
647 mlt_event_close( entry
->event
);
648 mlt_producer_close( entry
->producer
);
651 if ( where
== current
)
652 mlt_producer_seek( mlt_playlist_producer( this ), where_info
.start
);
653 else if ( where
< current
&& this->count
> 0 )
654 mlt_producer_seek( mlt_playlist_producer( this ), position
- where_info
.frame_count
);
655 else if ( this->count
== 0 )
656 mlt_producer_seek( mlt_playlist_producer( this ), 0 );
661 // Refresh the playlist
662 mlt_playlist_virtual_refresh( this );
668 /** Move an entry in the playlist.
671 int mlt_playlist_move( mlt_playlist
this, int src
, int dest
)
675 /* We need to ensure that the requested indexes are valid and correct it as necessary */
678 if ( src
>= this->count
)
679 src
= this->count
- 1;
683 if ( dest
>= this->count
)
684 dest
= this->count
- 1;
686 if ( src
!= dest
&& this->count
> 1 )
688 int current
= mlt_playlist_current_clip( this );
689 mlt_position position
= mlt_producer_position( mlt_playlist_producer( this ) );
690 playlist_entry
*src_entry
= NULL
;
692 // We need all the details about the current clip
693 mlt_playlist_clip_info current_info
;
695 mlt_playlist_get_clip_info( this, ¤t_info
, current
);
696 position
-= current_info
.start
;
698 if ( current
== src
)
700 else if ( current
> src
&& current
< dest
)
702 else if ( current
== dest
)
705 src_entry
= this->list
[ src
];
708 for ( i
= src
; i
> dest
; i
-- )
709 this->list
[ i
] = this->list
[ i
- 1 ];
713 for ( i
= src
; i
< dest
; i
++ )
714 this->list
[ i
] = this->list
[ i
+ 1 ];
716 this->list
[ dest
] = src_entry
;
718 mlt_playlist_get_clip_info( this, ¤t_info
, current
);
719 mlt_producer_seek( mlt_playlist_producer( this ), current_info
.start
+ position
);
720 mlt_playlist_virtual_refresh( this );
726 /** Repeat the specified clip n times.
729 int mlt_playlist_repeat_clip( mlt_playlist
this, int clip
, int repeat
)
731 int error
= repeat
< 1 || clip
< 0 || clip
>= this->count
;
734 playlist_entry
*entry
= this->list
[ clip
];
735 entry
->repeat
= repeat
;
736 mlt_playlist_virtual_refresh( this );
741 /** Resize the specified clip.
744 int mlt_playlist_resize_clip( mlt_playlist
this, int clip
, mlt_position in
, mlt_position out
)
746 int error
= clip
< 0 || clip
>= this->count
;
747 if ( error
== 0 && mlt_playlist_resize_mix( this, clip
, in
, out
) != 0 )
749 playlist_entry
*entry
= this->list
[ clip
];
750 mlt_producer producer
= entry
->producer
;
754 if ( out
<= -1 || out
>= mlt_producer_get_length( producer
) )
755 out
= mlt_producer_get_length( producer
) - 1;
764 mlt_producer_set_in_and_out( producer
, in
, out
);
769 /** Split a clip on the playlist at the given position.
772 int mlt_playlist_split( mlt_playlist
this, int clip
, mlt_position position
)
774 int error
= clip
< 0 || clip
>= this->count
;
777 playlist_entry
*entry
= this->list
[ clip
];
778 position
= position
< 0 ? entry
->frame_count
+ position
- 1 : position
;
779 if ( position
>= 0 && position
<= entry
->frame_count
)
781 mlt_producer split
= NULL
;
782 int in
= entry
->frame_in
;
783 int out
= entry
->frame_out
;
784 mlt_events_block( mlt_playlist_properties( this ), this );
785 mlt_playlist_resize_clip( this, clip
, in
, in
+ position
);
786 split
= mlt_producer_cut( entry
->producer
, in
+ position
+ 1, out
);
787 mlt_playlist_insert( this, split
, clip
+ 1, 0, -1 );
788 mlt_producer_close( split
);
789 mlt_events_unblock( mlt_playlist_properties( this ), this );
790 mlt_events_fire( mlt_playlist_properties( this ), "producer-changed", NULL
);
800 /** Join 1 or more consecutive clips.
803 int mlt_playlist_join( mlt_playlist
this, int clip
, int count
, int merge
)
805 int error
= clip
< 0 || ( clip
) >= this->count
;
809 mlt_playlist new_clip
= mlt_playlist_init( );
810 mlt_events_block( mlt_playlist_properties( this ), this );
811 if ( clip
+ count
>= this->count
)
812 count
= this->count
- clip
;
813 for ( i
= 0; i
<= count
; i
++ )
815 playlist_entry
*entry
= this->list
[ clip
];
816 mlt_playlist_append( new_clip
, entry
->producer
);
817 mlt_playlist_repeat_clip( new_clip
, i
, entry
->repeat
);
818 entry
->preservation_hack
= 1;
819 mlt_playlist_remove( this, clip
);
821 mlt_events_unblock( mlt_playlist_properties( this ), this );
822 mlt_playlist_insert( this, mlt_playlist_producer( new_clip
), clip
, 0, -1 );
823 mlt_playlist_close( new_clip
);
828 /** Mix consecutive clips for a specified length and apply transition if specified.
831 int mlt_playlist_mix( mlt_playlist
this, int clip
, int length
, mlt_transition transition
)
833 int error
= ( clip
< 0 || clip
+ 1 >= this->count
);
836 playlist_entry
*clip_a
= this->list
[ clip
];
837 playlist_entry
*clip_b
= this->list
[ clip
+ 1 ];
838 mlt_producer track_a
= NULL
;
839 mlt_producer track_b
= NULL
;
840 mlt_tractor tractor
= mlt_tractor_new( );
841 mlt_events_block( mlt_playlist_properties( this ), this );
843 // Check length is valid for both clips and resize if necessary.
844 int max_size
= clip_a
->frame_count
> clip_b
->frame_count ? clip_a
->frame_count
: clip_b
->frame_count
;
845 length
= length
> max_size ? max_size
: length
;
847 // Create the a and b tracks/cuts if necessary - note that no cuts are required if the length matches
848 if ( length
!= clip_a
->frame_count
)
849 track_a
= mlt_producer_cut( clip_a
->producer
, clip_a
->frame_out
- length
+ 1, clip_a
->frame_out
);
851 track_a
= clip_a
->producer
;
853 if ( length
!= clip_b
->frame_count
)
854 track_b
= mlt_producer_cut( clip_b
->producer
, clip_b
->frame_in
, clip_b
->frame_in
+ length
- 1 );
856 track_b
= clip_b
->producer
;
858 // Set the tracks on the tractor
859 mlt_tractor_set_track( tractor
, track_a
, 0 );
860 mlt_tractor_set_track( tractor
, track_b
, 1 );
862 // Insert the mix object into the playlist
863 mlt_playlist_insert( this, mlt_tractor_producer( tractor
), clip
+ 1, -1, -1 );
864 mlt_properties_set_data( mlt_tractor_properties( tractor
), "mlt_mix", tractor
, 0, NULL
, NULL
);
866 // Attach the transition
867 if ( transition
!= NULL
)
869 mlt_field field
= mlt_tractor_field( tractor
);
870 mlt_field_plant_transition( field
, transition
, 0, 1 );
871 mlt_transition_set_in_and_out( transition
, 0, length
- 1 );
874 // Close our references to the tracks if we created new cuts above (the tracks can still be used here)
875 if ( track_a
!= clip_a
->producer
)
876 mlt_producer_close( track_a
);
877 if ( track_b
!= clip_b
->producer
)
878 mlt_producer_close( track_b
);
880 // Check if we have anything left on the right hand clip
881 if ( track_b
== clip_b
->producer
)
883 clip_b
->preservation_hack
= 1;
884 mlt_playlist_remove( this, clip
+ 2 );
886 else if ( clip_b
->frame_out
- clip_b
->frame_in
> length
)
888 mlt_playlist_resize_clip( this, clip
+ 2, clip_b
->frame_in
+ length
, clip_b
->frame_out
);
889 mlt_properties_set_data( mlt_producer_properties( clip_b
->producer
), "mix_in", tractor
, 0, NULL
, NULL
);
890 mlt_properties_set_data( mlt_tractor_properties( tractor
), "mix_out", clip_b
->producer
, 0, NULL
, NULL
);
894 mlt_producer_clear( clip_b
->producer
);
895 mlt_playlist_remove( this, clip
+ 2 );
898 // Check if we have anything left on the left hand clip
899 if ( track_a
== clip_a
->producer
)
901 clip_a
->preservation_hack
= 1;
902 mlt_playlist_remove( this, clip
);
904 else if ( clip_a
->frame_out
- clip_a
->frame_in
> length
)
906 mlt_playlist_resize_clip( this, clip
, clip_a
->frame_in
, clip_a
->frame_out
- length
);
907 mlt_properties_set_data( mlt_producer_properties( clip_a
->producer
), "mix_out", tractor
, 0, NULL
, NULL
);
908 mlt_properties_set_data( mlt_tractor_properties( tractor
), "mix_in", clip_a
->producer
, 0, NULL
, NULL
);
912 mlt_producer_clear( clip_a
->producer
);
913 mlt_playlist_remove( this, clip
);
916 // Unblock and force a fire off of change events to listeners
917 mlt_events_unblock( mlt_playlist_properties( this ), this );
918 mlt_playlist_virtual_refresh( this );
919 mlt_tractor_close( tractor
);
924 /** Add a transition to an existing mix.
927 int mlt_playlist_mix_add( mlt_playlist
this, int clip
, mlt_transition transition
)
929 mlt_producer producer
= mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip
) );
930 mlt_properties properties
= producer
!= NULL ?
mlt_producer_properties( producer
) : NULL
;
931 mlt_tractor tractor
= properties
!= NULL ?
mlt_properties_get_data( properties
, "mlt_mix", NULL
) : NULL
;
932 int error
= transition
== NULL
|| tractor
== NULL
;
935 mlt_field field
= mlt_tractor_field( tractor
);
936 mlt_field_plant_transition( field
, transition
, 0, 1 );
937 mlt_transition_set_in_and_out( transition
, 0, this->list
[ clip
]->frame_count
- 1 );
942 /** Return the clip at the clip index.
945 mlt_producer
mlt_playlist_get_clip( mlt_playlist
this, int clip
)
947 if ( clip
>= 0 && clip
< this->count
)
948 return this->list
[ clip
]->producer
;
952 /** Return the clip at the specified position.
955 mlt_producer
mlt_playlist_get_clip_at( mlt_playlist
this, int position
)
957 int index
= 0, total
= 0;
958 return mlt_playlist_locate( this, &position
, &index
, &total
);
961 /** Return the clip index of the specified position.
964 int mlt_playlist_get_clip_index_at( mlt_playlist
this, int position
)
966 int index
= 0, total
= 0;
967 mlt_playlist_locate( this, &position
, &index
, &total
);
971 /** Determine if the clip is a mix.
974 int mlt_playlist_clip_is_mix( mlt_playlist
this, int clip
)
976 mlt_producer producer
= mlt_producer_cut_parent( mlt_playlist_get_clip( this, clip
) );
977 mlt_properties properties
= producer
!= NULL ?
mlt_producer_properties( producer
) : NULL
;
978 mlt_tractor tractor
= properties
!= NULL ?
mlt_properties_get_data( properties
, "mlt_mix", NULL
) : NULL
;
979 return tractor
!= NULL
;
982 /** Remove a mixed clip - ensure that the cuts included in the mix find their way
983 back correctly on to the playlist.
986 static int mlt_playlist_unmix( mlt_playlist
this, int clip
)
988 int error
= ( clip
< 0 || clip
>= this->count
);
990 // Ensure that the clip request is actually a mix
993 mlt_producer producer
= mlt_producer_cut_parent( this->list
[ clip
]->producer
);
994 mlt_properties properties
= mlt_producer_properties( producer
);
995 error
= mlt_properties_get_data( properties
, "mlt_mix", NULL
) == NULL
||
996 this->list
[ clip
]->preservation_hack
;
1001 playlist_entry
*mix
= this->list
[ clip
];
1002 mlt_tractor tractor
= ( mlt_tractor
)mlt_producer_cut_parent( mix
->producer
);
1003 mlt_properties properties
= mlt_tractor_properties( tractor
);
1004 mlt_producer clip_a
= mlt_properties_get_data( properties
, "mix_in", NULL
);
1005 mlt_producer clip_b
= mlt_properties_get_data( properties
, "mix_out", NULL
);
1006 int length
= mlt_producer_get_playtime( mlt_tractor_producer( tractor
) );
1007 mlt_events_block( mlt_playlist_properties( this ), this );
1009 if ( clip_a
!= NULL
)
1011 mlt_producer_set_in_and_out( clip_a
, mlt_producer_get_in( clip_a
), mlt_producer_get_out( clip_a
) + length
);
1015 mlt_producer cut
= mlt_tractor_get_track( tractor
, 0 );
1016 mlt_playlist_insert( this, cut
, clip
, -1, -1 );
1020 if ( clip_b
!= NULL
)
1022 mlt_producer_set_in_and_out( clip_b
, mlt_producer_get_in( clip_b
) - length
, mlt_producer_get_out( clip_b
) );
1026 mlt_producer cut
= mlt_tractor_get_track( tractor
, 1 );
1027 mlt_playlist_insert( this, cut
, clip
+ 1, -1, -1 );
1030 mlt_properties_set_data( properties
, "mlt_mix", NULL
, 0, NULL
, NULL
);
1031 mlt_playlist_remove( this, clip
);
1032 mlt_events_unblock( mlt_playlist_properties( this ), this );
1033 mlt_events_fire( mlt_playlist_properties( this ), "producer-changed", NULL
);
1038 static int mlt_playlist_resize_mix( mlt_playlist
this, int clip
, int in
, int out
)
1040 int error
= ( clip
< 0 || clip
>= this->count
);
1042 // Ensure that the clip request is actually a mix
1045 mlt_producer producer
= mlt_producer_cut_parent( this->list
[ clip
]->producer
);
1046 mlt_properties properties
= mlt_producer_properties( producer
);
1047 error
= mlt_properties_get_data( properties
, "mlt_mix", NULL
) == NULL
;
1052 playlist_entry
*mix
= this->list
[ clip
];
1053 mlt_tractor tractor
= ( mlt_tractor
)mlt_producer_cut_parent( mix
->producer
);
1054 mlt_properties properties
= mlt_tractor_properties( tractor
);
1055 mlt_producer clip_a
= mlt_properties_get_data( properties
, "mix_in", NULL
);
1056 mlt_producer clip_b
= mlt_properties_get_data( properties
, "mix_out", NULL
);
1057 mlt_producer track_a
= mlt_tractor_get_track( tractor
, 0 );
1058 mlt_producer track_b
= mlt_tractor_get_track( tractor
, 1 );
1059 int length
= out
- in
+ 1;
1060 int length_diff
= length
- mlt_producer_get_playtime( mlt_tractor_producer( tractor
) );
1061 mlt_events_block( mlt_playlist_properties( this ), this );
1063 if ( clip_a
!= NULL
)
1064 mlt_producer_set_in_and_out( clip_a
, mlt_producer_get_in( clip_a
), mlt_producer_get_out( clip_a
) - length_diff
);
1066 if ( clip_b
!= NULL
)
1067 mlt_producer_set_in_and_out( clip_b
, mlt_producer_get_in( clip_b
) + length_diff
, mlt_producer_get_out( clip_b
) );
1069 mlt_producer_set_in_and_out( track_a
, mlt_producer_get_in( track_a
) - length_diff
, mlt_producer_get_out( track_a
) );
1070 mlt_producer_set_in_and_out( track_b
, mlt_producer_get_in( track_b
), mlt_producer_get_out( track_b
) + length_diff
);
1071 mlt_producer_set_in_and_out( mlt_multitrack_producer( mlt_tractor_multitrack( tractor
) ), in
, out
);
1072 mlt_producer_set_in_and_out( mlt_tractor_producer( tractor
), in
, out
);
1073 mlt_properties_set_position( mlt_producer_properties( mix
->producer
), "length", out
- in
+ 1 );
1074 mlt_producer_set_in_and_out( mix
->producer
, in
, out
);
1076 mlt_events_unblock( mlt_playlist_properties( this ), this );
1077 mlt_playlist_virtual_refresh( this );
1082 /** Get the current frame.
1085 static int producer_get_frame( mlt_producer producer
, mlt_frame_ptr frame
, int index
)
1087 // Get this mlt_playlist
1088 mlt_playlist
this = producer
->child
;
1090 // Need to ensure the frame is deinterlaced when repeating 1 frame
1091 int progressive
= 0;
1093 // Get the real producer
1094 mlt_service real
= mlt_playlist_virtual_seek( this, &progressive
);
1097 mlt_service_get_frame( real
, frame
, index
);
1099 // Check if we're at the end of the clip
1100 mlt_properties properties
= mlt_frame_properties( *frame
);
1101 if ( mlt_properties_get_int( properties
, "end_of_clip" ) )
1102 mlt_playlist_virtual_set_out( this );
1104 // Set the consumer progressive property
1107 mlt_properties_set_int( properties
, "consumer_deinterlace", progressive
);
1108 mlt_properties_set_int( properties
, "test_audio", 1 );
1111 // Check for notifier and call with appropriate argument
1112 mlt_properties playlist_properties
= mlt_producer_properties( producer
);
1113 void ( *notifier
)( void * ) = mlt_properties_get_data( playlist_properties
, "notifier", NULL
);
1114 if ( notifier
!= NULL
)
1116 void *argument
= mlt_properties_get_data( playlist_properties
, "notifier_arg", NULL
);
1117 notifier( argument
);
1120 // Update position on the frame we're creating
1121 mlt_frame_set_position( *frame
, mlt_producer_frame( producer
) );
1123 // Position ourselves on the next frame
1124 mlt_producer_prepare_next( producer
);
1129 /** Close the playlist.
1132 void mlt_playlist_close( mlt_playlist
this )
1134 if ( this != NULL
&& mlt_properties_dec_ref( mlt_playlist_properties( this ) ) <= 0 )
1137 this->parent
.close
= NULL
;
1138 for ( i
= 0; i
< this->count
; i
++ )
1140 mlt_event_close( this->list
[ i
]->event
);
1141 mlt_producer_close( this->list
[ i
]->producer
);
1142 free( this->list
[ i
] );
1144 mlt_producer_close( &this->blank
);
1145 mlt_producer_close( &this->parent
);