3 * \brief abstraction for all producer services
5 * Copyright (C) 2003-2008 Ushodaya Enterprises Limited
6 * \author Charles Yates <charles.yates@pandora.be>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "mlt_producer.h"
24 #include "mlt_factory.h"
25 #include "mlt_frame.h"
26 #include "mlt_parser.h"
27 #include "mlt_profile.h"
34 /* Forward references. */
36 static int producer_get_frame( mlt_service
this, mlt_frame_ptr frame
, int index
);
37 static void mlt_producer_property_changed( mlt_service owner
, mlt_producer
this, char *name
);
38 static void mlt_producer_service_changed( mlt_service owner
, mlt_producer
this );
41 //#define _MLT_PRODUCER_CHECKS_ 1
42 #ifdef _MLT_PRODUCER_CHECKS_
43 static int producers_created
= 0;
44 static int producers_destroyed
= 0;
47 /** Initialize a producer service.
49 * \public \memberof mlt_producer_s
50 * \param this the producer structure to initialize
51 * \param child a pointer to the child object for the subclass
52 * \return true if there was an error
53 * \todo Document the special properties and events.
56 int mlt_producer_init( mlt_producer
this, void *child
)
58 // Check that we haven't received NULL
59 int error
= this == NULL
;
61 // Continue if no error
64 #ifdef _MLT_PRODUCER_CHECKS_
68 // Initialise the producer
69 memset( this, 0, sizeof( struct mlt_producer_s
) );
71 // Associate with the child
74 // Initialise the service
75 if ( mlt_service_init( &this->parent
, this ) == 0 )
77 // The parent is the service
78 mlt_service parent
= &this->parent
;
80 // Define the parent close
81 parent
->close
= ( mlt_destructor
)mlt_producer_close
;
82 parent
->close_object
= this;
84 // For convenience, we'll assume the close_object is this
85 this->close_object
= this;
87 // Get the properties of the parent
88 mlt_properties properties
= MLT_SERVICE_PROPERTIES( parent
);
90 // Set the default properties
91 mlt_properties_set( properties
, "mlt_type", "mlt_producer" );
92 mlt_properties_set_position( properties
, "_position", 0.0 );
93 mlt_properties_set_double( properties
, "_frame", 0 );
94 mlt_properties_set_double( properties
, "aspect_ratio", mlt_profile_sar( NULL
) );
95 mlt_properties_set_double( properties
, "_speed", 1.0 );
96 mlt_properties_set_position( properties
, "in", 0 );
97 mlt_properties_set_position( properties
, "out", 14999 );
98 mlt_properties_set_position( properties
, "length", 15000 );
99 mlt_properties_set( properties
, "eof", "pause" );
100 mlt_properties_set( properties
, "resource", "<producer>" );
102 // Override service get_frame
103 parent
->get_frame
= producer_get_frame
;
105 mlt_events_listen( properties
, this, "service-changed", ( mlt_listener
)mlt_producer_service_changed
);
106 mlt_events_listen( properties
, this, "property-changed", ( mlt_listener
)mlt_producer_property_changed
);
107 mlt_events_register( properties
, "producer-changed", NULL
);
114 /** Listener for property changes.
116 * If the in, out, or length properties changed, fire a "producer-changed" event.
118 * \private \memberof mlt_producer_s
119 * \param owner a service (ignored)
120 * \param this the producer
121 * \param name the property that changed
124 static void mlt_producer_property_changed( mlt_service owner
, mlt_producer
this, char *name
)
126 if ( !strcmp( name
, "in" ) || !strcmp( name
, "out" ) || !strcmp( name
, "length" ) )
127 mlt_events_fire( MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( this ) ), "producer-changed", NULL
);
130 /** Listener for service changes.
132 * Fires the "producer-changed" event.
134 * \private \memberof mlt_producer_s
135 * \param owner a service (ignored)
136 * \param this the producer
139 static void mlt_producer_service_changed( mlt_service owner
, mlt_producer
this )
141 mlt_events_fire( MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( this ) ), "producer-changed", NULL
);
144 /** Create and initialize a new producer.
146 * \public \memberof mlt_producer_s
147 * \return the new producer
150 mlt_producer
mlt_producer_new( )
152 mlt_producer
this = malloc( sizeof( struct mlt_producer_s
) );
153 mlt_producer_init( this, NULL
);
157 /** Determine if producer is a cut.
159 * \public \memberof mlt_producer_s
160 * \param this a producer
161 * \return true if \p this is a "cut" producer
162 * \see mlt_producer_cut
165 int mlt_producer_is_cut( mlt_producer
this )
167 return mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( this ), "_cut" );
170 /** Determine if producer is a mix.
172 * \public \memberof mlt_producer_s
173 * \param this a producer
174 * \return true if this is a "mix" producer
175 * \todo Define a mix producer.
178 int mlt_producer_is_mix( mlt_producer
this )
180 mlt_properties properties
= this != NULL ?
MLT_PRODUCER_PROPERTIES( this ) : NULL
;
181 mlt_tractor tractor
= properties
!= NULL ?
mlt_properties_get_data( properties
, "mlt_mix", NULL
) : NULL
;
182 return tractor
!= NULL
;
185 /** Determine if the producer is a blank.
187 * Blank producers should only appear as an item in a playlist.
188 * \public \memberof mlt_producer_s
189 * \param this a producer
190 * \return true if this is a "blank" producer
191 * \see mlt_playlist_insert_blank
194 int mlt_producer_is_blank( mlt_producer
this )
196 return this == NULL
|| !strcmp( mlt_properties_get( MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( this ) ), "resource" ), "blank" );
199 /** Obtain the parent producer.
201 * \public \memberof mlt_producer_s
202 * \param this a producer
203 * \return either the parent producer if this is a "cut" producer or \p this otherwise.
206 mlt_producer
mlt_producer_cut_parent( mlt_producer
this )
208 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
209 if ( mlt_producer_is_cut( this ) )
210 return mlt_properties_get_data( properties
, "_cut_parent", NULL
);
215 /** Create a cut of this producer.
217 * A "cut" is a portion of another (parent) producer.
219 * \public \memberof mlt_producer_s
220 * \param this a producer
221 * \param in the beginning
223 * \return the new producer
224 * \todo Expand on the value of a cut.
227 mlt_producer
mlt_producer_cut( mlt_producer
this, int in
, int out
)
229 mlt_producer result
= mlt_producer_new( );
230 mlt_producer parent
= mlt_producer_cut_parent( this );
231 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( result
);
232 mlt_properties parent_props
= MLT_PRODUCER_PROPERTIES( parent
);
234 mlt_events_block( MLT_PRODUCER_PROPERTIES( result
), MLT_PRODUCER_PROPERTIES( result
) );
235 // Special case - allow for a cut of the entire producer (this will squeeze all other cuts to 0)
238 if ( ( out
< 0 || out
>= mlt_producer_get_length( parent
) ) && !mlt_producer_is_blank( this ) )
239 out
= mlt_producer_get_length( parent
) - 1;
241 mlt_properties_inc_ref( parent_props
);
242 mlt_properties_set_int( properties
, "_cut", 1 );
243 mlt_properties_set_data( properties
, "_cut_parent", parent
, 0, ( mlt_destructor
)mlt_producer_close
, NULL
);
244 mlt_properties_set_position( properties
, "length", mlt_properties_get_position( parent_props
, "length" ) );
245 mlt_properties_set_double( properties
, "aspect_ratio", mlt_properties_get_double( parent_props
, "aspect_ratio" ) );
246 mlt_producer_set_in_and_out( result
, in
, out
);
251 /** Get the parent service object.
253 * \public \memberof mlt_producer_s
254 * \param this a producer
255 * \return the service parent class
256 * \see MLT_PRODUCER_SERVICE
259 mlt_service
mlt_producer_service( mlt_producer
this )
261 return this != NULL ?
&this->parent
: NULL
;
264 /** Get the producer properties.
266 * \public \memberof mlt_producer_s
267 * \param this a producer
268 * \return the producer's property list
271 mlt_properties
mlt_producer_properties( mlt_producer
this )
273 return MLT_SERVICE_PROPERTIES( &this->parent
);
276 /** Seek to a specified position.
278 * \public \memberof mlt_producer_s
279 * \param this a producer
280 * \param position set the "play head" position of the producer
282 * \todo Document how the properties affect behavior.
285 int mlt_producer_seek( mlt_producer
this, mlt_position position
)
287 // Determine eof handling
288 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
289 char *eof
= mlt_properties_get( properties
, "eof" );
290 int use_points
= 1 - mlt_properties_get_int( properties
, "ignore_points" );
292 // Recursive behaviour for cuts - repositions parent and then repositions cut
293 // hence no return on this condition
294 if ( mlt_producer_is_cut( this ) )
295 mlt_producer_seek( mlt_producer_cut_parent( this ), position
+ mlt_producer_get_in( this ) );
298 if ( position
< 0 || mlt_producer_get_playtime( this ) == 0 )
302 else if ( use_points
&& ( eof
== NULL
|| !strcmp( eof
, "pause" ) ) && position
>= mlt_producer_get_playtime( this ) )
304 mlt_producer_set_speed( this, 0 );
305 position
= mlt_producer_get_playtime( this ) - 1;
307 else if ( use_points
&& !strcmp( eof
, "loop" ) && position
>= mlt_producer_get_playtime( this ) )
309 position
= (int)position
% (int)mlt_producer_get_playtime( this );
313 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( this ), "_position", position
);
315 // Calculate the absolute frame
316 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( this ), "_frame", use_points
* mlt_producer_get_in( this ) + position
);
321 /** Get the current position (relative to in point).
323 * \public \memberof mlt_producer_s
324 * \param this a producer
325 * \return the position of the "play head" relative to its beginning
328 mlt_position
mlt_producer_position( mlt_producer
this )
330 return mlt_properties_get_position( MLT_PRODUCER_PROPERTIES( this ), "_position" );
333 /** Get the current position (relative to start of producer).
335 * \public \memberof mlt_producer_s
336 * \param this a producer
337 * \return the position of the "play head" regardless of the in point
340 mlt_position
mlt_producer_frame( mlt_producer
this )
342 return mlt_properties_get_position( MLT_PRODUCER_PROPERTIES( this ), "_frame" );
345 /** Set the playing speed.
347 * \public \memberof mlt_producer_s
348 * \param this a producer
349 * \param speed the new speed as a relative factor (1.0 = normal)
353 int mlt_producer_set_speed( mlt_producer
this, double speed
)
355 return mlt_properties_set_double( MLT_PRODUCER_PROPERTIES( this ), "_speed", speed
);
358 /** Get the playing speed.
360 * \public \memberof mlt_producer_s
361 * \param this a producer
362 * \return the speed as a relative factor (1.0 = normal)
365 double mlt_producer_get_speed( mlt_producer
this )
367 return mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "_speed" );
370 /** Get the frames per second.
372 * This is determined by the producer's profile.
374 * \public \memberof mlt_producer_s
375 * \param this a producer
376 * \return the video refresh rate
379 double mlt_producer_get_fps( mlt_producer
this )
381 mlt_profile profile
= mlt_service_profile( MLT_PRODUCER_SERVICE( this ) );
382 return mlt_profile_fps( profile
);
385 /** Set the in and out points.
387 * The in point is where play out should start relative to the natural start
388 * of the underlying file. The out point is where play out should end, also
389 * relative to the start of the underlying file. If the underlying resource is
390 * a live stream, then the in point is an offset relative to first usable
393 * \public \memberof mlt_producer_s
394 * \param this a producer
395 * \param in the relative starting time
396 * \param out the relative ending time
400 int mlt_producer_set_in_and_out( mlt_producer
this, mlt_position in
, mlt_position out
)
402 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
404 // Correct ins and outs if necessary
407 else if ( in
>= mlt_producer_get_length( this ) )
408 in
= mlt_producer_get_length( this ) - 1;
412 else if ( out
>= mlt_producer_get_length( this ) && !mlt_producer_is_blank( this ) )
413 out
= mlt_producer_get_length( this ) - 1;
414 else if ( out
>= mlt_producer_get_length( this ) && mlt_producer_is_blank( this ) )
415 mlt_properties_set_position( MLT_PRODUCER_PROPERTIES( this ), "length", out
+ 1 );
417 // Swap ins and outs if wrong
426 mlt_events_block( properties
, properties
);
427 mlt_properties_set_position( properties
, "in", in
);
428 mlt_events_unblock( properties
, properties
);
429 mlt_properties_set_position( properties
, "out", out
);
434 /** Physically reduce the producer (typically a cut) to a 0 length.
435 * Essentially, all 0 length cuts should be immediately removed by containers.
437 * \public \memberof mlt_producer_s
438 * \param this a producer
442 int mlt_producer_clear( mlt_producer
this )
446 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
447 mlt_events_block( properties
, properties
);
448 mlt_properties_set_position( properties
, "in", 0 );
449 mlt_events_unblock( properties
, properties
);
450 mlt_properties_set_position( properties
, "out", -1 );
455 /** Get the in point.
457 * \public \memberof mlt_producer_s
458 * \param this a producer
459 * \return the in point
462 mlt_position
mlt_producer_get_in( mlt_producer
this )
464 return mlt_properties_get_position( MLT_PRODUCER_PROPERTIES( this ), "in" );
467 /** Get the out point.
469 * \public \memberof mlt_producer_s
470 * \param this a producer
471 * \return the out point
474 mlt_position
mlt_producer_get_out( mlt_producer
this )
476 return mlt_properties_get_position( MLT_PRODUCER_PROPERTIES( this ), "out" );
479 /** Get the total play time.
481 * \public \memberof mlt_producer_s
482 * \param this a producer
483 * \return the playable (based on in and out points) duration
486 mlt_position
mlt_producer_get_playtime( mlt_producer
this )
488 return mlt_producer_get_out( this ) - mlt_producer_get_in( this ) + 1;
491 /** Get the total length of the producer.
493 * The value returned by a live streaming producer is unknown.
495 * \public \memberof mlt_producer_s
496 * \param this a producer
497 * \return the duration of the producer regardless of in and out points
500 mlt_position
mlt_producer_get_length( mlt_producer
this )
502 return mlt_properties_get_position( MLT_PRODUCER_PROPERTIES( this ), "length" );
505 /** Prepare for next frame.
507 * Advance the play out position. If the speed is less than zero, it will
508 * move the play out position in the reverse direction.
510 * \public \memberof mlt_producer_s
511 * \param this a producer
514 void mlt_producer_prepare_next( mlt_producer
this )
516 if ( mlt_producer_get_speed( this ) != 0 )
517 mlt_producer_seek( this, mlt_producer_position( this ) + mlt_producer_get_speed( this ) );
522 * This is the implementation of the \p get_frame virtual function.
523 * It requests a new frame object from the actual producer for the current
524 * play out position. The producer and its filters can add information and
525 * operations to the frame object in their get_frame handlers.
527 * \private \memberof mlt_producer_s
528 * \param service a service
529 * \param[out] frame a frame by reference
530 * \param index as determined by the actual producer
531 * \return true if there was an error
532 * \todo Learn more about the details and document how certain properties affect
536 static int producer_get_frame( mlt_service service
, mlt_frame_ptr frame
, int index
)
539 mlt_producer
this = service
!= NULL ? service
->child
: NULL
;
541 if ( this != NULL
&& !mlt_producer_is_cut( this ) )
543 // Get the properties of this producer
544 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
546 // Determine eof handling
547 char *eof
= mlt_properties_get( MLT_PRODUCER_PROPERTIES( this ), "eof" );
549 // Get the speed of the producer
550 double speed
= mlt_producer_get_speed( this );
552 // We need to use the clone if it's specified
553 mlt_producer clone
= mlt_properties_get_data( properties
, "use_clone", NULL
);
555 // If no clone is specified, use this
556 clone
= clone
== NULL ?
this : clone
;
558 // A properly instatiated producer will have a get_frame method...
559 if ( this->get_frame
== NULL
|| ( !strcmp( eof
, "continue" ) && mlt_producer_position( this ) > mlt_producer_get_out( this ) ) )
561 // Generate a test frame
562 *frame
= mlt_frame_init( service
);
565 result
= mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
567 // Mark as a test card
568 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame
), "test_image", 1 );
569 mlt_properties_set_int( MLT_FRAME_PROPERTIES( *frame
), "test_audio", 1 );
571 // Calculate the next position
572 mlt_producer_prepare_next( this );
576 // Get the frame from the implementation
577 result
= this->get_frame( clone
, frame
, index
);
580 // Copy the fps and speed of the producer onto the frame
581 properties
= MLT_FRAME_PROPERTIES( *frame
);
582 mlt_properties_set_double( properties
, "_speed", speed
);
583 mlt_properties_set_int( properties
, "test_audio", mlt_frame_is_test_audio( *frame
) );
584 mlt_properties_set_int( properties
, "test_image", mlt_frame_is_test_card( *frame
) );
585 if ( mlt_properties_get_data( properties
, "_producer", NULL
) == NULL
)
586 mlt_properties_set_data( properties
, "_producer", service
, 0, NULL
, NULL
);
588 else if ( this != NULL
)
590 // Get the speed of the cut
591 double speed
= mlt_producer_get_speed( this );
593 // Get the parent of this cut
594 mlt_producer parent
= mlt_producer_cut_parent( this );
596 // Get the properties of the parent
597 mlt_properties parent_properties
= MLT_PRODUCER_PROPERTIES( parent
);
599 // Get the properties of the cut
600 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
602 // Determine the clone index
603 int clone_index
= mlt_properties_get_int( properties
, "_clone" );
605 // Determine the clone to use
606 mlt_producer clone
= this;
608 if ( clone_index
> 0 )
611 sprintf( key
, "_clone.%d", clone_index
- 1 );
612 clone
= mlt_properties_get_data( MLT_PRODUCER_PROPERTIES( mlt_producer_cut_parent( this ) ), key
, NULL
);
613 if ( clone
== NULL
) fprintf( stderr
, "requested clone doesn't exist %d\n", clone_index
);
614 clone
= clone
== NULL ?
this : clone
;
621 // We need to seek to the correct position in the clone
622 mlt_producer_seek( clone
, mlt_producer_get_in( this ) + mlt_properties_get_int( properties
, "_position" ) );
624 // Assign the clone property to the parent
625 mlt_properties_set_data( parent_properties
, "use_clone", clone
, 0, NULL
, NULL
);
627 // Now get the frame from the parents service
628 result
= mlt_service_get_frame( MLT_PRODUCER_SERVICE( parent
), frame
, index
);
630 // We're done with the clone now
631 mlt_properties_set_data( parent_properties
, "use_clone", NULL
, 0, NULL
, NULL
);
633 // This is useful and required by always_active transitions to determine in/out points of the cut
634 if ( mlt_properties_get_data( MLT_FRAME_PROPERTIES( *frame
), "_producer", NULL
) == MLT_PRODUCER_SERVICE( parent
) )
635 mlt_properties_set_data( MLT_FRAME_PROPERTIES( *frame
), "_producer", this, 0, NULL
, NULL
);
637 mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame
), "_speed", speed
);
638 mlt_producer_prepare_next( this );
642 *frame
= mlt_frame_init( service
);
646 // Pass on all meta properties from the producer/cut on to the frame
647 if ( *frame
!= NULL
&& this != NULL
)
650 mlt_properties p_props
= MLT_PRODUCER_PROPERTIES( this );
651 mlt_properties f_props
= MLT_FRAME_PROPERTIES( *frame
);
652 int count
= mlt_properties_count( p_props
);
653 for ( i
= 0; i
< count
; i
++ )
655 char *name
= mlt_properties_get_name( p_props
, i
);
656 if ( !strncmp( name
, "meta.", 5 ) )
657 mlt_properties_set( f_props
, name
, mlt_properties_get( p_props
, name
) );
658 else if ( !strncmp( name
, "set.", 4 ) )
659 mlt_properties_set( f_props
, name
+ 4, mlt_properties_get( p_props
, name
) );
668 * \public \memberof mlt_producer_s
669 * \param this a producer
670 * \param filter the filter to attach
671 * \return true if there was an error
674 int mlt_producer_attach( mlt_producer
this, mlt_filter filter
)
676 return mlt_service_attach( MLT_PRODUCER_SERVICE( this ), filter
);
681 * \public \memberof mlt_producer_s
682 * \param this a service
683 * \param filter the filter to detach
684 * \return true if there was an error
687 int mlt_producer_detach( mlt_producer
this, mlt_filter filter
)
689 return mlt_service_detach( MLT_PRODUCER_SERVICE( this ), filter
);
692 /** Retrieve a filter.
694 * \public \memberof mlt_producer_s
695 * \param this a service
696 * \param index which filter to retrieve
697 * \return the filter or null if there was an error
700 mlt_filter
mlt_producer_filter( mlt_producer
this, int index
)
702 return mlt_service_filter( MLT_PRODUCER_SERVICE( this ), index
);
705 /** Clone this producer.
707 * \private \memberof mlt_producer_s
708 * \param this a producer
709 * \return a new producer that is a copy of \p this
710 * \see mlt_producer_set_clones
713 static mlt_producer
mlt_producer_clone( mlt_producer
this )
715 mlt_producer clone
= NULL
;
716 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
717 char *resource
= mlt_properties_get( properties
, "resource" );
718 char *service
= mlt_properties_get( properties
, "mlt_service" );
719 mlt_profile profile
= mlt_service_profile( MLT_PRODUCER_SERVICE( this ) );
721 mlt_events_block( mlt_factory_event_object( ), mlt_factory_event_object( ) );
723 if ( service
!= NULL
)
724 clone
= mlt_factory_producer( profile
, service
, resource
);
726 if ( clone
== NULL
&& resource
!= NULL
)
727 clone
= mlt_factory_producer( profile
, mlt_environment( "MLT_PRODUCER" ), resource
);
730 mlt_properties_inherit( MLT_PRODUCER_PROPERTIES( clone
), properties
);
732 mlt_events_unblock( mlt_factory_event_object( ), mlt_factory_event_object( ) );
739 * \private \memberof mlt_producer_s
740 * \param this a producer
741 * \param clones the number of copies to make
742 * \see mlt_producer_optimise
745 static void mlt_producer_set_clones( mlt_producer
this, int clones
)
747 mlt_producer parent
= mlt_producer_cut_parent( this );
748 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( parent
);
749 int existing
= mlt_properties_get_int( properties
, "_clones" );
753 // If the number of existing clones is different, then create/remove as necessary
754 if ( existing
!= clones
)
756 if ( existing
< clones
)
758 for ( i
= existing
; i
< clones
; i
++ )
760 mlt_producer clone
= mlt_producer_clone( parent
);
761 sprintf( key
, "_clone.%d", i
);
762 mlt_properties_set_data( properties
, key
, clone
, 0, ( mlt_destructor
)mlt_producer_close
, NULL
);
767 for ( i
= clones
; i
< existing
; i
++ )
769 sprintf( key
, "_clone.%d", i
);
770 mlt_properties_set_data( properties
, key
, NULL
, 0, NULL
, NULL
);
775 // Ensure all properties on the parent are passed to the clones
776 for ( i
= 0; i
< clones
; i
++ )
778 mlt_producer clone
= NULL
;
779 sprintf( key
, "_clone.%d", i
);
780 clone
= mlt_properties_get_data( properties
, key
, NULL
);
782 mlt_properties_pass( MLT_PRODUCER_PROPERTIES( clone
), properties
, "" );
785 // Update the number of clones on the properties
786 mlt_properties_set_int( properties
, "_clones", clones
);
789 /** \brief private to mlt_producer_s, used by mlt_producer_optimise() */
801 /** \brief private to mlt_producer_s, used by mlt_producer_optimise() */
811 static int intersect( clip_references
*a
, clip_references
*b
)
813 int diff
= ( a
->start
- b
->start
) + ( a
->end
- b
->end
);
814 return diff
>= 0 && diff
< ( a
->end
- a
->start
+ 1 );
817 static int push( mlt_parser
this, int multitrack
, int track
, int position
)
819 mlt_properties properties
= mlt_parser_properties( this );
820 mlt_deque stack
= mlt_properties_get_data( properties
, "stack", NULL
);
821 track_info
*info
= malloc( sizeof( track_info
) );
822 info
->multitrack
= multitrack
;
824 info
->position
= position
;
827 return mlt_deque_push_back( stack
, info
);
830 static track_info
*pop( mlt_parser
this )
832 mlt_properties properties
= mlt_parser_properties( this );
833 mlt_deque stack
= mlt_properties_get_data( properties
, "stack", NULL
);
834 return mlt_deque_pop_back( stack
);
837 static track_info
*peek( mlt_parser
this )
839 mlt_properties properties
= mlt_parser_properties( this );
840 mlt_deque stack
= mlt_properties_get_data( properties
, "stack", NULL
);
841 return mlt_deque_peek_back( stack
);
844 static int on_start_multitrack( mlt_parser
this, mlt_multitrack object
)
846 track_info
*info
= peek( this );
847 return push( this, info
->multitrack
++, info
->track
, info
->position
);
850 static int on_start_track( mlt_parser
this )
852 track_info
*info
= peek( this );
853 info
->position
-= info
->offset
;
854 info
->length
-= info
->offset
;
855 return push( this, info
->multitrack
, info
->track
++, info
->position
);
858 static int on_start_producer( mlt_parser
this, mlt_producer object
)
860 mlt_properties properties
= mlt_parser_properties( this );
861 mlt_properties producers
= mlt_properties_get_data( properties
, "producers", NULL
);
862 mlt_producer parent
= mlt_producer_cut_parent( object
);
863 if ( mlt_service_identify( ( mlt_service
)mlt_producer_cut_parent( object
) ) == producer_type
&& mlt_producer_is_cut( object
) )
866 clip_references
*old_refs
= NULL
;
867 clip_references
*refs
= NULL
;
870 track_info
*info
= peek( this );
871 sprintf( key
, "%p", parent
);
872 mlt_properties_get_data( producers
, key
, &count
);
873 mlt_properties_set_data( producers
, key
, parent
, ++ count
, NULL
, NULL
);
874 old_refs
= mlt_properties_get_data( properties
, key
, &ref_count
);
875 refs
= malloc( ( ref_count
+ 1 ) * sizeof( clip_references
) );
876 if ( old_refs
!= NULL
)
877 memcpy( refs
, old_refs
, ref_count
* sizeof( clip_references
) );
878 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( object
), "_clone", -1 );
879 refs
[ ref_count
].cut
= object
;
880 refs
[ ref_count
].start
= info
->position
;
881 refs
[ ref_count
].end
= info
->position
+ mlt_producer_get_playtime( object
) - 1;
882 mlt_properties_set_data( properties
, key
, refs
, ++ ref_count
, free
, NULL
);
883 info
->position
+= mlt_producer_get_playtime( object
);
884 info
->length
+= mlt_producer_get_playtime( object
);
889 static int on_end_track( mlt_parser
this )
891 track_info
*track
= pop( this );
892 track_info
*multi
= peek( this );
893 multi
->length
+= track
->length
;
894 multi
->position
+= track
->length
;
895 multi
->offset
= track
->length
;
900 static int on_end_multitrack( mlt_parser
this, mlt_multitrack object
)
902 track_info
*multi
= pop( this );
903 track_info
*track
= peek( this );
904 track
->position
+= multi
->length
;
905 track
->length
+= multi
->length
;
910 /** Optimise for overlapping cuts from the same clip.
912 * \todo learn more about this
913 * \public \memberof mlt_producer_s
914 * \param this a producer
915 * \return true if there was an error
918 int mlt_producer_optimise( mlt_producer
this )
921 mlt_parser parser
= mlt_parser_new( );
922 if ( parser
!= NULL
)
924 int i
= 0, j
= 0, k
= 0;
925 mlt_properties properties
= mlt_parser_properties( parser
);
926 mlt_properties producers
= mlt_properties_new( );
927 mlt_deque stack
= mlt_deque_init( );
928 mlt_properties_set_data( properties
, "producers", producers
, 0, ( mlt_destructor
)mlt_properties_close
, NULL
);
929 mlt_properties_set_data( properties
, "stack", stack
, 0, ( mlt_destructor
)mlt_deque_close
, NULL
);
930 parser
->on_start_producer
= on_start_producer
;
931 parser
->on_start_track
= on_start_track
;
932 parser
->on_end_track
= on_end_track
;
933 parser
->on_start_multitrack
= on_start_multitrack
;
934 parser
->on_end_multitrack
= on_end_multitrack
;
935 push( parser
, 0, 0, 0 );
936 mlt_parser_start( parser
, MLT_PRODUCER_SERVICE( this ) );
937 free( pop( parser
) );
938 for ( k
= 0; k
< mlt_properties_count( producers
); k
++ )
940 char *name
= mlt_properties_get_name( producers
, k
);
944 mlt_producer producer
= mlt_properties_get_data( producers
, name
, &count
);
945 if ( producer
!= NULL
&& count
> 1 )
947 clip_references
*refs
= mlt_properties_get_data( properties
, name
, &count
);
948 for ( i
= 0; i
< count
; i
++ )
951 for ( j
= i
+ 1; j
< count
; j
++ )
953 if ( intersect( &refs
[ i
], &refs
[ j
] ) )
956 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( refs
[ j
].cut
), "_clone", clones
);
959 if ( clones
> max_clones
)
963 for ( i
= 0; i
< count
; i
++ )
965 mlt_producer cut
= refs
[ i
].cut
;
966 if ( mlt_properties_get_int( MLT_PRODUCER_PROPERTIES( cut
), "_clone" ) == -1 )
967 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( cut
), "_clone", 0 );
970 mlt_producer_set_clones( producer
, max_clones
);
972 else if ( producer
!= NULL
)
974 clip_references
*refs
= mlt_properties_get_data( properties
, name
, &count
);
975 for ( i
= 0; i
< count
; i
++ )
977 mlt_producer cut
= refs
[ i
].cut
;
978 mlt_properties_set_int( MLT_PRODUCER_PROPERTIES( cut
), "_clone", 0 );
980 mlt_producer_set_clones( producer
, 0 );
983 mlt_parser_close( parser
);
988 /** Close the producer.
990 * Destroys the producer and deallocates its resources managed by its
991 * properties list. This will call the close virtual function. Therefore, a
992 * subclass that defines its own close function should set its virtual close
993 * function to NULL prior to calling this to avoid circular calls.
995 * \public \memberof mlt_producer_s
996 * \param this a producer
999 void mlt_producer_close( mlt_producer
this )
1001 if ( this != NULL
&& mlt_properties_dec_ref( MLT_PRODUCER_PROPERTIES( this ) ) <= 0 )
1003 this->parent
.close
= NULL
;
1005 if ( this->close
!= NULL
)
1007 this->close( this->close_object
);
1011 int destroy
= mlt_producer_is_cut( this );
1013 #if _MLT_PRODUCER_CHECKS_ == 1
1015 mlt_properties_debug( MLT_PRODUCER_PROPERTIES( this ), "Producer closing", stderr
);
1018 #ifdef _MLT_PRODUCER_CHECKS_
1019 // Increment destroyed count
1020 producers_destroyed
++;
1022 // Show current stats - these should match when the app is closed
1023 fprintf( stderr
, "Producers created %d, destroyed %d\n", producers_created
, producers_destroyed
);
1026 mlt_service_close( &this->parent
);