2 * producer_westley.c -- a libxml2 parser of mlt service networks
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
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.
21 // TODO: destroy unreferenced producers (they are currently destroyed
22 // when the returned producer is closed).
23 // TODO: determine why deserialise_context can not be released.
25 #include "producer_westley.h"
26 #include <framework/mlt.h>
31 #include <libxml/parser.h>
32 #include <libxml/parserInternals.h> // for xmlCreateFileParserCtxt
33 #include <libxml/tree.h>
35 #define STACK_SIZE 1000
37 struct deserialise_context_s
39 mlt_service stack_service[ STACK_SIZE ];
40 int stack_service_size;
41 mlt_properties producer_map;
42 mlt_properties destructors;
44 mlt_properties producer_properties;
47 xmlNodePtr stack_node[ STACK_SIZE ];
51 typedef struct deserialise_context_s *deserialise_context;
57 static int context_push_service( deserialise_context this, mlt_service that )
59 int ret = this->stack_service_size >= STACK_SIZE - 1;
61 this->stack_service[ this->stack_service_size ++ ] = that;
68 static mlt_service context_pop_service( deserialise_context this )
70 mlt_service result = NULL;
71 if ( this->stack_service_size > 0 )
72 result = this->stack_service[ -- this->stack_service_size ];
79 static int context_push_node( deserialise_context this, xmlNodePtr node )
81 int ret = this->stack_node_size >= STACK_SIZE - 1;
83 this->stack_node[ this->stack_node_size ++ ] = node;
90 static xmlNodePtr context_pop_node( deserialise_context this )
92 xmlNodePtr result = NULL;
93 if ( this->stack_node_size > 0 )
94 result = this->stack_node[ -- this->stack_node_size ];
99 // Set the destructor on a new service
100 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
102 int registered = mlt_properties_get_int( properties, "registered" );
103 char *key = mlt_properties_get( properties, "registered" );
104 mlt_properties_set_data( properties, key, service, 0, destructor, NULL );
105 mlt_properties_set_int( properties, "registered", ++ registered );
109 // Forward declarations
110 static void on_end_track( deserialise_context context, const xmlChar *name );
111 static void on_end_entry( deserialise_context context, const xmlChar *name );
113 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
115 mlt_service service = mlt_tractor_service( mlt_tractor_init() );
116 mlt_properties properties = mlt_service_properties( service );
118 track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
120 mlt_properties_set_position( properties, "length", 0 );
122 for ( ; atts != NULL && *atts != NULL; atts += 2 )
123 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
125 if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
127 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
128 mlt_properties_set_position( properties, "length", length );
131 if ( mlt_properties_get( properties, "id" ) != NULL )
132 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
134 context_push_service( context, service );
137 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
139 mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
140 mlt_properties properties = mlt_service_properties( service );
142 track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
144 mlt_properties_set_position( properties, "length", 0 );
146 for ( ; atts != NULL && *atts != NULL; atts += 2 )
147 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
149 if ( mlt_properties_get( properties, "id" ) != NULL )
150 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
152 context_push_service( context, service );
155 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
157 mlt_service service = mlt_playlist_service( mlt_playlist_init() );
158 mlt_properties properties = mlt_service_properties( service );
160 track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
162 mlt_properties_set_position( properties, "length", 0 );
164 for ( ; atts != NULL && *atts != NULL; atts += 2 )
166 mlt_properties_set( properties, ( char* )atts[0], ( char* )atts[1] );
168 // Out will be overwritten later as we append, so we need to save it
169 if ( strcmp( atts[ 0 ], "out" ) == 0 )
170 mlt_properties_set( properties, "_westley.out", ( char* )atts[ 1 ] );
173 if ( mlt_properties_get( properties, "id" ) != NULL )
174 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
176 context_push_service( context, service );
179 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
181 mlt_properties properties = context->producer_properties = mlt_properties_new();
183 for ( ; atts != NULL && *atts != NULL; atts += 2 )
185 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
189 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
191 // Get the playlist from the stack
192 mlt_service service = context_pop_service( context );
193 mlt_position length = 0;
195 if ( service == NULL )
198 // Look for the length attribute
199 for ( ; atts != NULL && *atts != NULL; atts += 2 )
201 if ( strcmp( atts[0], "length" ) == 0 )
203 length = atoll( atts[1] );
208 // Append a blank to the playlist
209 mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
211 // Push the playlist back onto the stack
212 context_push_service( context, service );
215 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
217 // Use a dummy service to hold properties to allow arbitrary nesting
218 mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
219 mlt_service_init( service, NULL );
221 // Push the dummy service onto the stack
222 context_push_service( context, service );
224 if ( strcmp( name, "entry" ) == 0 )
225 mlt_properties_set( mlt_service_properties( service ), "resource", "<entry>" );
227 for ( ; atts != NULL && *atts != NULL; atts += 2 )
229 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
231 // Look for the producer attribute
232 if ( strcmp( atts[ 0 ], "producer" ) == 0 )
234 if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) != NULL )
235 // Push the referenced producer onto the stack
236 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
241 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
243 mlt_properties properties = context->producer_properties = mlt_properties_new();
245 // Set the properties
246 for ( ; atts != NULL && *atts != NULL; atts += 2 )
247 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
250 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
252 mlt_properties properties = context->producer_properties = mlt_properties_new();
254 // Set the properties
255 for ( ; atts != NULL && *atts != NULL; atts += 2 )
256 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
259 static void on_start_property( deserialise_context context, const xmlChar *name, const xmlChar **atts)
261 mlt_properties properties = context->producer_properties;
264 if ( properties == NULL )
267 // Set the properties
268 for ( ; atts != NULL && *atts != NULL; atts += 2 )
270 if ( strcmp( atts[ 0 ], "name" ) == 0 )
272 context->property = strdup( atts[ 1 ] );
274 else if ( strcmp( atts[ 0 ], "value" ) == 0 )
276 value = (char*) atts[ 1 ];
280 if ( context->property != NULL && value != NULL )
281 mlt_properties_set( properties, context->property, value );
283 // Tell parser to collect any further nodes for serialisation
284 context->is_value = 1;
288 /** This function adds a producer to a playlist or multitrack when
289 there is no entry or track element.
292 static int add_producer( deserialise_context context, mlt_service service, mlt_position in, mlt_position out )
294 // Get the parent producer
295 mlt_service producer = context_pop_service( context );
296 if ( producer != NULL )
298 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
300 // Put the parent producer back
301 context_push_service( context, producer );
303 // If the parent producer is a multitrack or playlist (not a track or entry)
304 if ( resource && ( strcmp( resource, "<playlist>" ) == 0 ||
305 strcmp( resource, "<multitrack>" ) == 0 ) )
307 if ( strcmp( resource, "<playlist>" ) == 0 )
309 // Append this producer to the playlist
310 mlt_playlist_append_io( MLT_PLAYLIST( producer ),
311 MLT_PRODUCER( service ), in, out );
315 // Set this producer on the multitrack
316 mlt_multitrack_connect( MLT_MULTITRACK( producer ),
317 MLT_PRODUCER( service ),
318 mlt_multitrack_count( MLT_MULTITRACK( producer ) ) );
320 // Normally, the enclosing entry or track will pop this service off
321 // In its absence we do not push it on.
328 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
330 // Get the multitrack from the stack
331 mlt_service producer = context_pop_service( context );
332 if ( producer == NULL )
335 // Get the tractor from the stack
336 mlt_service service = context_pop_service( context );
338 // Create a tractor if one does not exist
339 char *resource = NULL;
340 if ( service != NULL )
341 resource = mlt_properties_get( mlt_service_properties( service ), "resource" );
342 if ( service == NULL || resource == NULL || strcmp( resource, "<tractor>" ) )
344 // Put the anonymous service back onto the stack!
345 context_push_service( context, service );
347 service = mlt_tractor_service( mlt_tractor_init() );
348 track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
350 // Inherit the producer's properties
351 mlt_properties properties = mlt_service_properties( service );
352 mlt_properties_set_position( properties, "length", mlt_producer_get_out( MLT_PRODUCER( producer ) ) + 1 );
353 mlt_producer_set_in_and_out( MLT_PRODUCER( service ), 0, mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
354 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( MLT_PRODUCER( producer ) ) );
357 // Connect the tractor to the multitrack
358 mlt_tractor_connect( MLT_TRACTOR( service ), producer );
359 mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
360 MLT_MULTITRACK( producer ), 0, NULL, NULL );
362 // See if the producer should be added to a playlist or multitrack
363 add_producer( context, service, 0, mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
365 // Always push the multitrack back onto the stack for filters and transitions
366 context_push_service( context, producer );
368 // Always push the tractor back onto the stack for filters and transitions
369 context_push_service( context, service );
372 static void on_end_playlist( deserialise_context context, const xmlChar *name )
374 // Get the playlist from the stack
375 mlt_service producer = context_pop_service( context );
376 if ( producer == NULL )
378 mlt_properties properties = mlt_service_properties( producer );
380 mlt_position in = mlt_properties_get_position( properties, "in" );
383 if ( mlt_properties_get( properties, "_westley.out" ) != NULL )
384 out = mlt_properties_get_position( properties, "_westley.out" );
386 out = mlt_properties_get_position( properties, "length" ) - 1;
388 if ( mlt_properties_get_position( properties, "length" ) < out )
389 mlt_properties_set_position( properties, "length", out + 1 );
391 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ), in, out );
393 // See if the playlist should be added to a playlist or multitrack
394 if ( add_producer( context, producer, in, out ) == 0 )
396 // Otherwise, push the playlist back onto the stack
397 context_push_service( context, producer );
400 static void on_end_track( deserialise_context context, const xmlChar *name )
402 // Get the producer from the stack
403 mlt_service producer = context_pop_service( context );
404 if ( producer == NULL )
407 // See if the producer is a tractor
408 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
409 if ( resource && strcmp( resource, "<tractor>" ) == 0 )
410 // If so chomp its producer
411 context_pop_service( context );
413 // Get the dummy track service from the stack
414 mlt_service track = context_pop_service( context );
417 context_push_service( context, producer );
421 // Get the multitrack from the stack
422 mlt_service service = context_pop_service( context );
423 if ( service == NULL )
425 context_push_service( context, producer );
429 // Set the track on the multitrack
430 mlt_multitrack_connect( MLT_MULTITRACK( service ),
431 MLT_PRODUCER( producer ),
432 mlt_multitrack_count( MLT_MULTITRACK( service ) ) );
434 // Set producer i/o if specified
435 if ( mlt_properties_get( mlt_service_properties( track ), "in" ) != NULL ||
436 mlt_properties_get( mlt_service_properties( track ), "out" ) != NULL )
438 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ),
439 mlt_properties_get_position( mlt_service_properties( track ), "in" ),
440 mlt_properties_get_position( mlt_service_properties( track ), "out" ) );
443 // Push the multitrack back onto the stack
444 context_push_service( context, service );
446 mlt_service_close( track );
449 static void on_end_entry( deserialise_context context, const xmlChar *name )
451 // Get the producer from the stack
452 mlt_service producer = context_pop_service( context );
453 if ( producer == NULL )
456 // See if the producer is a tractor
457 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
458 if ( resource && strcmp( resource, "<tractor>" ) == 0 )
459 // If so chomp its producer
460 context_pop_service( context );
462 // Get the dummy entry service from the stack
463 mlt_service entry = context_pop_service( context );
466 context_push_service( context, producer );
470 // Get the playlist from the stack
471 mlt_service service = context_pop_service( context );
472 if ( service == NULL )
474 context_push_service( context, producer );
478 // Append the producer to the playlist
479 if ( mlt_properties_get( mlt_service_properties( entry ), "in" ) != NULL ||
480 mlt_properties_get( mlt_service_properties( entry ), "out" ) != NULL )
482 mlt_playlist_append_io( MLT_PLAYLIST( service ),
483 MLT_PRODUCER( producer ),
484 mlt_properties_get_position( mlt_service_properties( entry ), "in" ),
485 mlt_properties_get_position( mlt_service_properties( entry ), "out" ) );
489 mlt_playlist_append( MLT_PLAYLIST( service ), MLT_PRODUCER( producer ) );
492 // Push the playlist back onto the stack
493 context_push_service( context, service );
495 mlt_service_close( entry );
498 static void on_end_tractor( deserialise_context context, const xmlChar *name )
501 mlt_service tractor = context_pop_service( context );
502 if ( tractor == NULL )
505 // Get the tractor's multitrack
506 mlt_producer multitrack = mlt_properties_get_data( mlt_service_properties( tractor ), "multitrack", NULL );
507 if ( multitrack != NULL )
509 // Inherit the producer's properties
510 mlt_properties properties = mlt_producer_properties( MLT_PRODUCER( tractor ) );
511 mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
512 mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
513 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
516 // See if the tractor should be added to a playlist or multitrack
517 if ( add_producer( context, tractor, 0, mlt_producer_get_out( MLT_PRODUCER( tractor ) ) ) == 0 )
519 // Otherwise, push the tractor back onto the stack
520 context_push_service( context, tractor );
523 static void on_end_property( deserialise_context context, const xmlChar *name )
525 // Tell parser to stop building a tree
526 context->is_value = 0;
528 // See if there is a xml tree for the value
529 if ( context->property != NULL && context->value_doc != NULL )
534 // Serialise the tree to get value
535 xmlDocDumpMemory( context->value_doc, &value, &size );
536 mlt_properties_set( context->producer_properties, context->property, value );
538 xmlFreeDoc( context->value_doc );
539 context->value_doc = NULL;
542 // Close this property handling
543 free( context->property );
544 context->property = NULL;
547 static void on_end_producer( deserialise_context context, const xmlChar *name )
549 mlt_properties properties = context->producer_properties;
550 mlt_service service = NULL;
552 if ( properties == NULL )
555 char *resource = mlt_properties_get( properties, "resource" );
556 // Let Kino-SMIL src be a synonym for resource
557 if ( resource == NULL )
558 resource = mlt_properties_get( properties, "src" );
560 // Instantiate the producer
561 if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
563 service = MLT_SERVICE( mlt_factory_producer( "fezzik", mlt_properties_get( properties, "mlt_service" ) ) );
565 if ( service == NULL && resource != NULL )
567 char *root = mlt_properties_get( context->producer_map, "_root" );
568 char *full_resource = malloc( strlen( root ) + strlen( resource ) + 1 );
569 if ( resource[ 0 ] != '/' )
571 strcpy( full_resource, root );
572 strcat( full_resource, resource );
576 strcpy( full_resource, resource );
578 service = MLT_SERVICE( mlt_factory_producer( "fezzik", full_resource ) );
579 free( full_resource );
581 if ( service == NULL )
583 track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
585 // Add the producer to the producer map
586 if ( mlt_properties_get( properties, "id" ) != NULL )
587 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
589 // Handle in/out properties separately
590 mlt_position in = -1;
591 mlt_position out = -1;
594 if ( mlt_properties_get( properties, "in" ) != NULL )
595 in = mlt_properties_get_position( properties, "in" );
596 // Let Kino-SMIL clipBegin be a synonym for in
597 if ( mlt_properties_get( properties, "clipBegin" ) != NULL )
598 in = mlt_properties_get_position( properties, "clipBegin" );
600 if ( mlt_properties_get( properties, "out" ) != NULL )
601 out = mlt_properties_get_position( properties, "out" );
602 // Let Kino-SMIL clipEnd be a synonym for out
603 if ( mlt_properties_get( properties, "clipEnd" ) != NULL )
604 out = mlt_properties_get_position( properties, "clipEnd" );
607 mlt_properties_set( properties, "in", NULL );
608 mlt_properties_set( properties, "out", NULL );
610 mlt_properties_inherit( mlt_service_properties( service ), properties );
611 mlt_properties_close( properties );
612 context->producer_properties = NULL;
614 // See if the producer should be added to a playlist or multitrack
615 if ( add_producer( context, service, in, out ) == 0 )
617 // Otherwise, set in and out on...
618 if ( in != -1 || out != -1 )
620 // Get the parent service
621 mlt_service parent = context_pop_service( context );
622 if ( parent != NULL )
624 // Get the parent properties
625 properties = mlt_service_properties( parent );
627 char *resource = mlt_properties_get( properties, "resource" );
629 // Put the parent producer back
630 context_push_service( context, parent );
632 // If the parent is a track or entry
633 if ( resource && ( strcmp( resource, "<entry>" ) == 0 ) )
635 mlt_properties_set_position( properties, "in", in );
636 mlt_properties_set_position( properties, "out", out );
640 // Otherwise, set in and out on producer directly
641 mlt_producer_set_in_and_out( MLT_PRODUCER( service ), in, out );
646 // Otherwise, set in and out on producer directly
647 mlt_producer_set_in_and_out( MLT_PRODUCER( service ), in, out );
651 // Push the producer onto the stack
652 context_push_service( context, service );
656 static void on_end_filter( deserialise_context context, const xmlChar *name )
658 mlt_properties properties = context->producer_properties;
659 if ( properties == NULL )
665 mlt_service tractor = NULL;
667 // Get the producer from the stack
668 mlt_service producer = context_pop_service( context );
669 if ( producer == NULL )
672 // See if the producer is a tractor
673 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
674 if ( resource != NULL && strcmp( resource, "<tractor>" ) == 0 )
676 // If so, then get the next producer
678 producer = context_pop_service( context );
681 //fprintf( stderr, "connecting filter to %s\n", mlt_properties_get( mlt_service_properties( producer ), "resource" ) );
684 mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
685 if ( service == NULL )
687 context_push_service( context, producer );
690 track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
692 // Connect the filter to the producer
693 mlt_filter_connect( MLT_FILTER( service ), producer,
694 mlt_properties_get_int( properties, "track" ) );
696 // Set in and out from producer if non existant
697 if ( mlt_properties_get( properties, "in" ) == NULL )
698 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
699 if ( mlt_properties_get( properties, "out" ) == NULL )
700 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
702 // Propogate the properties
703 mlt_properties_inherit( mlt_service_properties( service ), properties );
704 mlt_properties_close( properties );
705 context->producer_properties = NULL;
706 properties = mlt_service_properties( service );
708 // Set in and out again due to inheritance
709 mlt_filter_set_in_and_out( MLT_FILTER( service ),
710 mlt_properties_get_position( properties, "in" ),
711 mlt_properties_get_position( properties, "out" ) );
713 // If a producer alias is in the producer_map, get it
714 snprintf( key, 10, "%p", producer );
715 if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
716 producer = mlt_properties_get_data( context->producer_map, key, NULL );
718 // Put the producer in the producer map
719 id = mlt_properties_get( mlt_service_properties( producer ), "id" );
721 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
723 // For filter chain support, add an alias to the producer map
724 snprintf( key, 10, "%p", service );
725 mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
727 // Push the filter onto the stack
728 context_push_service( context, service );
730 if ( tractor != NULL )
732 // Connect the tractor to the filter
733 mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
735 // Push the tractor back onto the stack
736 context_push_service( context, tractor );
740 static void on_end_transition( deserialise_context context, const xmlChar *name )
742 mlt_service tractor = NULL;
743 mlt_properties properties = context->producer_properties;
744 if ( properties == NULL )
747 // Get the producer from the stack
748 mlt_service producer = context_pop_service( context );
749 if ( producer == NULL )
752 // See if the producer is a tractor
753 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
754 if ( resource != NULL && strcmp( resource, "<tractor>" ) == 0 )
756 // If so, then get the next producer
758 producer = context_pop_service( context );
761 // Create the transition
762 mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
763 if ( service == NULL )
765 context_push_service( context, producer );
768 track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
770 // Propogate the properties
771 mlt_properties_inherit( mlt_service_properties( service ), properties );
772 mlt_properties_close( properties );
773 context->producer_properties = NULL;
774 properties = mlt_service_properties( service );
776 // Set in and out again due to inheritance
777 mlt_transition_set_in_and_out( MLT_TRANSITION( service ),
778 mlt_properties_get_position( properties, "in" ),
779 mlt_properties_get_position( properties, "out" ) );
781 // Connect the transition to the producer
782 mlt_transition_connect( MLT_TRANSITION( service ), producer,
783 mlt_properties_get_int( properties, "a_track" ),
784 mlt_properties_get_int( properties, "b_track" ) );
786 // Push the transition onto the stack
787 context_push_service( context, service );
789 if ( tractor != NULL )
791 // Connect the tractor to the transition
792 mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
794 // Push the tractor back onto the stack
795 context_push_service( context, tractor );
799 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
801 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
802 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
804 // Build a tree from nodes within a property value
805 if ( context->is_value == 1 )
807 xmlNodePtr node = xmlNewNode( NULL, name );
809 if ( context->value_doc == NULL )
812 context->value_doc = xmlNewDoc( "1.0" );
813 xmlDocSetRootElement( context->value_doc, node );
817 // Append child to tree
818 xmlAddChild( context->stack_node[ context->stack_node_size - 1 ], node );
820 context_push_node( context, node );
822 // Set the attributes
823 for ( ; atts != NULL && *atts != NULL; atts += 2 )
824 xmlSetProp( node, atts[ 0 ], atts[ 1 ] );
826 else if ( strcmp( name, "tractor" ) == 0 )
827 on_start_tractor( context, name, atts );
828 else if ( strcmp( name, "multitrack" ) == 0 )
829 on_start_multitrack( context, name, atts );
830 else if ( strcmp( name, "playlist" ) == 0 || strcmp( name, "seq" ) == 0 || strcmp( name, "smil" ) == 0 )
831 on_start_playlist( context, name, atts );
832 else if ( strcmp( name, "producer" ) == 0 || strcmp( name, "video" ) == 0 )
833 on_start_producer( context, name, atts );
834 else if ( strcmp( name, "blank" ) == 0 )
835 on_start_blank( context, name, atts );
836 else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
837 on_start_entry_track( context, name, atts );
838 else if ( strcmp( name, "filter" ) == 0 )
839 on_start_filter( context, name, atts );
840 else if ( strcmp( name, "transition" ) == 0 )
841 on_start_transition( context, name, atts );
842 else if ( strcmp( name, "property" ) == 0 )
843 on_start_property( context, name, atts );
846 static void on_end_element( void *ctx, const xmlChar *name )
848 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
849 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
851 if ( context->is_value == 1 && strcmp( name, "property" ) != 0 )
852 context_pop_node( context );
853 else if ( strcmp( name, "multitrack" ) == 0 )
854 on_end_multitrack( context, name );
855 else if ( strcmp( name, "playlist" ) == 0 || strcmp( name, "seq" ) == 0 || strcmp( name, "smil" ) == 0 )
856 on_end_playlist( context, name );
857 else if ( strcmp( name, "track" ) == 0 )
858 on_end_track( context, name );
859 else if ( strcmp( name, "entry" ) == 0 )
860 on_end_entry( context, name );
861 else if ( strcmp( name, "tractor" ) == 0 )
862 on_end_tractor( context, name );
863 else if ( strcmp( name, "property" ) == 0 )
864 on_end_property( context, name );
865 else if ( strcmp( name, "producer" ) == 0 || strcmp( name, "video" ) == 0 )
866 on_end_producer( context, name );
867 else if ( strcmp( name, "filter" ) == 0 )
868 on_end_filter( context, name );
869 else if ( strcmp( name, "transition" ) == 0 )
870 on_end_transition( context, name );
873 static void on_characters( void *ctx, const xmlChar *ch, int len )
875 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
876 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
877 char *value = calloc( len + 1, 1 );
880 strncpy( value, (const char*) ch, len );
882 if ( context->stack_node_size > 0 )
883 xmlNodeAddContent( context->stack_node[ context->stack_node_size - 1 ], ( xmlChar* )value );
885 else if ( context->property != NULL && context->producer_properties != NULL )
886 mlt_properties_set( context->producer_properties, context->property, value );
891 // The following 3 facilitate entity substitution in the SAX parser
892 static void on_internal_subset( void *ctx, const xmlChar* name,
893 const xmlChar* publicId, const xmlChar* systemId )
895 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
896 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
898 xmlCreateIntSubset( context->entity_doc, name, publicId, systemId );
901 static void on_entity_declaration( void *ctx, const xmlChar* name, int type,
902 const xmlChar* publicId, const xmlChar* systemId, xmlChar* content)
904 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
905 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
907 xmlAddDocEntity( context->entity_doc, name, type, publicId, systemId, content );
910 xmlEntityPtr on_get_entity( void *ctx, const xmlChar* name )
912 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
913 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
915 return xmlGetDocEntity( context->entity_doc, name );
919 mlt_producer producer_westley_init( char *filename )
921 xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
922 struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
923 mlt_properties properties = NULL;
925 struct _xmlParserCtxt *xmlcontext;
928 context->producer_map = mlt_properties_new();
929 context->destructors = mlt_properties_new();
931 // We need to track the number of registered filters
932 mlt_properties_set_int( context->destructors, "registered", 0 );
934 // We need the directory prefix which was used for the westley
935 mlt_properties_set( context->producer_map, "_root", "" );
936 if ( strchr( filename, '/' ) )
939 mlt_properties_set( context->producer_map, "_root", filename );
940 root = mlt_properties_get( context->producer_map, "_root" );
941 *( strrchr( root, '/' ) + 1 ) = '\0';
944 // Setup SAX callbacks
945 sax->startElement = on_start_element;
946 sax->endElement = on_end_element;
947 sax->characters = on_characters;
948 sax->cdataBlock = on_characters;
949 sax->internalSubset = on_internal_subset;
950 sax->entityDecl = on_entity_declaration;
951 sax->getEntity = on_get_entity;
953 // Setup libxml2 SAX parsing
955 xmlSubstituteEntitiesDefault( 1 );
956 // This is used to facilitate entity substitution in the SAX parser
957 context->entity_doc = xmlNewDoc( "1.0" );
958 xmlcontext = xmlCreateFileParserCtxt( filename );
959 xmlcontext->sax = sax;
960 xmlcontext->_private = ( void* )context;
963 xmlParseDocument( xmlcontext );
964 well_formed = xmlcontext->wellFormed;
966 // Cleanup after parsing
967 xmlFreeDoc( context->entity_doc );
969 xmlcontext->sax = NULL;
970 xmlcontext->_private = NULL;
971 xmlFreeParserCtxt( xmlcontext );
972 xmlMemoryDump( ); // for debugging
974 // Get the last producer on the stack
975 mlt_service service = context_pop_service( context );
976 if ( well_formed && service != NULL )
978 // Verify it is a producer service (mlt_type="mlt_producer")
979 // (producer, playlist, multitrack)
980 char *type = mlt_properties_get( mlt_service_properties( service ), "mlt_type" );
981 if ( type == NULL || ( strcmp( type, "mlt_producer" ) != 0 ) )
985 if ( well_formed && service != NULL )
987 // Need the complete producer list for various reasons
988 properties = context->destructors;
990 // Now make sure we don't have a reference to the service in the properties
991 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
993 char *name = mlt_properties_get_name( properties, i );
994 if ( mlt_properties_get_data( properties, name, NULL ) == service )
996 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
1001 // We are done referencing destructor property list
1002 // Set this var to service properties for convenience
1003 properties = mlt_service_properties( service );
1005 // make the returned service destroy the connected services
1006 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
1008 // Now assign additional properties
1009 mlt_properties_set( properties, "resource", filename );
1011 // This tells consumer_westley not to deep copy
1012 mlt_properties_set( properties, "westley", "was here" );
1016 // Return null if not well formed
1020 mlt_properties_close( context->destructors );
1023 free( context->stack_service );
1024 mlt_properties_close( context->producer_map );
1027 return MLT_PRODUCER( service );