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).
24 #include "producer_westley.h"
25 #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
36 #define BRANCH_SIG_LEN 4000
40 extern xmlDocPtr westley_make_doc( mlt_service service );
43 struct deserialise_context_s
45 mlt_service stack_service[ STACK_SIZE ];
46 int stack_service_size;
47 mlt_properties producer_map;
48 mlt_properties destructors;
50 mlt_properties producer_properties;
53 xmlNodePtr stack_node[ STACK_SIZE ];
56 int entity_is_replace;
58 int branch[ STACK_SIZE ];
59 const xmlChar *publicId;
60 const xmlChar *systemId;
61 mlt_properties params;
63 typedef struct deserialise_context_s *deserialise_context;
65 /** Convert the numerical current branch address to a dot-delimited string.
67 static char *serialise_branch( deserialise_context this, char *s )
72 for ( i = 0; i < this->depth; i++ )
74 int len = strlen( s );
75 snprintf( s + len, BRANCH_SIG_LEN - len, "%d.", this->branch[ i ] );
83 static int context_push_service( deserialise_context this, mlt_service that )
85 int ret = this->stack_service_size >= STACK_SIZE - 1;
88 this->stack_service[ this->stack_service_size++ ] = that;
90 // Record the tree branch on which this service lives
91 if ( mlt_properties_get( mlt_service_properties( that ), "_westley_branch" ) == NULL )
93 char s[ BRANCH_SIG_LEN ];
94 mlt_properties_set( mlt_service_properties( that ), "_westley_branch", serialise_branch( this, s ) );
103 static mlt_service context_pop_service( deserialise_context this )
105 mlt_service result = NULL;
106 if ( this->stack_service_size > 0 )
107 result = this->stack_service[ -- this->stack_service_size ];
114 static int context_push_node( deserialise_context this, xmlNodePtr node )
116 int ret = this->stack_node_size >= STACK_SIZE - 1;
118 this->stack_node[ this->stack_node_size ++ ] = node;
125 static xmlNodePtr context_pop_node( deserialise_context this )
127 xmlNodePtr result = NULL;
128 if ( this->stack_node_size > 0 )
129 result = this->stack_node[ -- this->stack_node_size ];
134 // Set the destructor on a new service
135 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
137 int registered = mlt_properties_get_int( properties, "registered" );
138 char *key = mlt_properties_get( properties, "registered" );
139 mlt_properties_set_data( properties, key, service, 0, destructor, NULL );
140 mlt_properties_set_int( properties, "registered", ++ registered );
144 // Forward declarations
145 static void on_end_track( deserialise_context context, const xmlChar *name );
146 static void on_end_entry( deserialise_context context, const xmlChar *name );
148 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
150 mlt_service service = mlt_tractor_service( mlt_tractor_init() );
151 mlt_properties properties = mlt_service_properties( service );
153 track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
155 mlt_properties_set_position( properties, "length", 0 );
157 for ( ; atts != NULL && *atts != NULL; atts += 2 )
158 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
160 if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
162 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
163 mlt_properties_set_position( properties, "length", length );
166 if ( mlt_properties_get( properties, "id" ) != NULL )
167 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
169 context_push_service( context, service );
172 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
174 mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
175 mlt_properties properties = mlt_service_properties( service );
177 track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
179 mlt_properties_set_position( properties, "length", 0 );
181 for ( ; atts != NULL && *atts != NULL; atts += 2 )
182 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
184 if ( mlt_properties_get( properties, "id" ) != NULL )
185 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
187 context_push_service( context, service );
190 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
192 mlt_service service = mlt_playlist_service( mlt_playlist_init() );
193 mlt_properties properties = mlt_service_properties( service );
195 track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
197 mlt_properties_set_position( properties, "length", 0 );
199 for ( ; atts != NULL && *atts != NULL; atts += 2 )
201 mlt_properties_set( properties, ( char* )atts[0], ( char* )atts[1] );
203 // Out will be overwritten later as we append, so we need to save it
204 if ( strcmp( atts[ 0 ], "out" ) == 0 )
205 mlt_properties_set( properties, "_westley.out", ( char* )atts[ 1 ] );
208 if ( mlt_properties_get( properties, "id" ) != NULL )
209 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
211 context_push_service( context, service );
214 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
216 mlt_properties properties = context->producer_properties = mlt_properties_new();
218 for ( ; atts != NULL && *atts != NULL; atts += 2 )
220 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
224 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
226 // Get the playlist from the stack
227 mlt_service service = context_pop_service( context );
228 mlt_position length = 0;
230 if ( service == NULL )
233 // Look for the length attribute
234 for ( ; atts != NULL && *atts != NULL; atts += 2 )
236 if ( strcmp( atts[0], "length" ) == 0 )
238 length = atoll( atts[1] );
243 // Append a blank to the playlist
244 mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
246 // Push the playlist back onto the stack
247 context_push_service( context, service );
250 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
252 // Use a dummy service to hold properties to allow arbitrary nesting
253 mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
254 mlt_service_init( service, NULL );
256 // Push the dummy service onto the stack
257 context_push_service( context, service );
259 if ( strcmp( name, "entry" ) == 0 )
260 mlt_properties_set( mlt_service_properties( service ), "resource", "<entry>" );
262 mlt_properties_set( mlt_service_properties( service ), "resource", "<track>" );
264 for ( ; atts != NULL && *atts != NULL; atts += 2 )
266 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
268 // Look for the producer attribute
269 if ( strcmp( atts[ 0 ], "producer" ) == 0 )
271 if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) != NULL )
272 // Push the referenced producer onto the stack
273 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
275 // Remove the dummy service to cause end element failure
276 context_pop_service( context );
281 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
283 mlt_properties properties = context->producer_properties = mlt_properties_new();
285 // Set the properties
286 for ( ; atts != NULL && *atts != NULL; atts += 2 )
287 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
290 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
292 mlt_properties properties = context->producer_properties = mlt_properties_new();
294 // Set the properties
295 for ( ; atts != NULL && *atts != NULL; atts += 2 )
296 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
299 static void on_start_property( deserialise_context context, const xmlChar *name, const xmlChar **atts)
301 mlt_properties properties = context->producer_properties;
304 if ( properties == NULL )
307 // Set the properties
308 for ( ; atts != NULL && *atts != NULL; atts += 2 )
310 if ( strcmp( atts[ 0 ], "name" ) == 0 )
312 context->property = strdup( atts[ 1 ] );
314 else if ( strcmp( atts[ 0 ], "value" ) == 0 )
316 value = (char*) atts[ 1 ];
320 if ( context->property != NULL && value != NULL )
321 mlt_properties_set( properties, context->property, value );
323 // Tell parser to collect any further nodes for serialisation
324 context->is_value = 1;
328 /** This function adds a producer to a playlist or multitrack when
329 there is no entry or track element.
332 static int add_producer( deserialise_context context, mlt_service service, mlt_position in, mlt_position out )
334 // Get the parent producer
335 mlt_service producer = context_pop_service( context );
337 if ( producer != NULL )
339 char current_branch[ BRANCH_SIG_LEN ];
340 char *service_branch = mlt_properties_get( mlt_service_properties( producer ), "_westley_branch" );
342 // Validate the producer from the stack is an ancestor and not predecessor
343 serialise_branch( context, current_branch );
344 if ( service_branch != NULL && strncmp( service_branch, current_branch, strlen( service_branch ) ) == 0 )
346 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
348 // Put the parent producer back
349 context_push_service( context, producer );
351 // If the parent producer is a multitrack or playlist (not a track or entry)
352 if ( resource && ( strcmp( resource, "<playlist>" ) == 0 ||
353 strcmp( resource, "<multitrack>" ) == 0 ) )
355 //printf( "add_producer: current branch %s service branch %s (%d)\n", current_branch, service_branch, strncmp( service_branch, current_branch, strlen( service_branch ) ) );
356 if ( strcmp( resource, "<playlist>" ) == 0 )
358 // Append this producer to the playlist
359 mlt_playlist_append_io( MLT_PLAYLIST( producer ),
360 MLT_PRODUCER( service ), in, out );
364 mlt_properties properties = mlt_service_properties( service );
366 // Set this producer on the multitrack
367 mlt_multitrack_connect( MLT_MULTITRACK( producer ),
368 MLT_PRODUCER( service ),
369 mlt_multitrack_count( MLT_MULTITRACK( producer ) ) );
371 // Set the hide state of the track producer
372 char *hide_s = mlt_properties_get( properties, "hide" );
373 if ( hide_s != NULL )
375 if ( strcmp( hide_s, "video" ) == 0 )
376 mlt_properties_set_int( properties, "hide", 1 );
377 else if ( strcmp( hide_s, "audio" ) == 0 )
378 mlt_properties_set_int( properties, "hide", 2 );
379 else if ( strcmp( hide_s, "both" ) == 0 )
380 mlt_properties_set_int( properties, "hide", 3 );
384 // Normally, the enclosing entry or track will pop this service off
385 // In its absence we do not push it on.
393 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
395 // Get the multitrack from the stack
396 mlt_service producer = context_pop_service( context );
397 if ( producer == NULL )
400 // Get the tractor from the stack
401 mlt_service service = context_pop_service( context );
403 // Create a tractor if one does not exist
404 char *resource = NULL;
405 if ( service != NULL )
406 resource = mlt_properties_get( mlt_service_properties( service ), "resource" );
407 if ( service == NULL || resource == NULL || strcmp( resource, "<tractor>" ) )
409 //printf("creating a tractor\n");
410 char current_branch[ BRANCH_SIG_LEN ];
412 // Put the anonymous service back onto the stack!
413 if ( service != NULL )
414 context_push_service( context, service );
416 // Fabricate the tractor
417 service = mlt_tractor_service( mlt_tractor_init() );
418 track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
420 // Inherit the producer's properties
421 mlt_properties properties = mlt_service_properties( service );
422 mlt_properties_set_position( properties, "length", mlt_producer_get_out( MLT_PRODUCER( producer ) ) + 1 );
423 mlt_producer_set_in_and_out( MLT_PRODUCER( service ), 0, mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
424 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( MLT_PRODUCER( producer ) ) );
426 mlt_properties_set( properties, "_westley_branch", serialise_branch( context, current_branch ) );
429 // Connect the tractor to the multitrack
430 mlt_tractor_connect( MLT_TRACTOR( service ), producer );
431 mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
432 MLT_MULTITRACK( producer ), 0, NULL, NULL );
434 // See if the tractor should be added to a playlist or multitrack
435 add_producer( context, service, 0, mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
437 // Always push the multitrack back onto the stack for filters and transitions
438 context_push_service( context, producer );
440 // Always push the tractor back onto the stack for filters and transitions
441 context_push_service( context, service );
444 static void on_end_playlist( deserialise_context context, const xmlChar *name )
446 // Get the playlist from the stack
447 mlt_service producer = context_pop_service( context );
448 if ( producer == NULL )
450 mlt_properties properties = mlt_service_properties( producer );
452 mlt_position in = mlt_properties_get_position( properties, "in" );
455 if ( mlt_properties_get( properties, "_westley.out" ) != NULL )
456 out = mlt_properties_get_position( properties, "_westley.out" );
458 out = mlt_properties_get_position( properties, "length" ) - 1;
460 if ( mlt_properties_get_position( properties, "length" ) < out )
461 mlt_properties_set_position( properties, "length", out + 1 );
463 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ), in, out );
465 // See if the playlist should be added to a playlist or multitrack
466 if ( add_producer( context, producer, in, out ) == 0 )
468 // Otherwise, push the playlist back onto the stack
469 context_push_service( context, producer );
472 static void on_end_track( deserialise_context context, const xmlChar *name )
474 // Get the producer from the stack
475 mlt_service producer = context_pop_service( context );
476 if ( producer == NULL )
478 mlt_properties producer_props = mlt_service_properties( producer );
480 // See if the producer is a tractor
481 char *resource = mlt_properties_get( producer_props, "resource" );
482 if ( resource && strcmp( resource, "<tractor>" ) == 0 )
483 // If so chomp its producer
484 context_pop_service( context );
486 // Get the dummy track service from the stack
487 mlt_service track = context_pop_service( context );
488 if ( track == NULL || strcmp( mlt_properties_get( mlt_service_properties( track ), "resource" ), "<track>" ) )
490 context_push_service( context, producer );
493 mlt_properties track_props = mlt_service_properties( track );
495 // Get the multitrack from the stack
496 mlt_service service = context_pop_service( context );
497 if ( service == NULL )
499 context_push_service( context, producer );
503 // Set the track on the multitrack
504 mlt_multitrack_connect( MLT_MULTITRACK( service ),
505 MLT_PRODUCER( producer ),
506 mlt_multitrack_count( MLT_MULTITRACK( service ) ) );
508 // Set producer i/o if specified
509 if ( mlt_properties_get( track_props, "in" ) != NULL ||
510 mlt_properties_get( track_props, "out" ) != NULL )
512 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ),
513 mlt_properties_get_position( track_props, "in" ),
514 mlt_properties_get_position( track_props, "out" ) );
517 // Set the hide state of the track producer
518 char *hide_s = mlt_properties_get( track_props, "hide" );
519 if ( hide_s != NULL )
521 if ( strcmp( hide_s, "video" ) == 0 )
522 mlt_properties_set_int( producer_props, "hide", 1 );
523 else if ( strcmp( hide_s, "audio" ) == 0 )
524 mlt_properties_set_int( producer_props, "hide", 2 );
525 else if ( strcmp( hide_s, "both" ) == 0 )
526 mlt_properties_set_int( producer_props, "hide", 3 );
529 // Push the multitrack back onto the stack
530 context_push_service( context, service );
532 mlt_service_close( track );
535 static void on_end_entry( deserialise_context context, const xmlChar *name )
537 // Get the producer from the stack
538 mlt_service producer = context_pop_service( context );
539 if ( producer == NULL )
542 // See if the producer is a tractor
543 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
544 if ( resource && strcmp( resource, "<tractor>" ) == 0 )
545 // If so chomp its producer
546 context_pop_service( context );
548 // Get the dummy entry service from the stack
549 mlt_service entry = context_pop_service( context );
550 if ( entry == NULL || strcmp( mlt_properties_get( mlt_service_properties( entry ), "resource" ), "<entry>" ) )
552 context_push_service( context, producer );
556 // Get the playlist from the stack
557 mlt_service service = context_pop_service( context );
558 if ( service == NULL )
560 context_push_service( context, producer );
564 // Append the producer to the playlist
565 if ( mlt_properties_get( mlt_service_properties( entry ), "in" ) != NULL ||
566 mlt_properties_get( mlt_service_properties( entry ), "out" ) != NULL )
568 mlt_playlist_append_io( MLT_PLAYLIST( service ),
569 MLT_PRODUCER( producer ),
570 mlt_properties_get_position( mlt_service_properties( entry ), "in" ),
571 mlt_properties_get_position( mlt_service_properties( entry ), "out" ) );
575 mlt_playlist_append( MLT_PLAYLIST( service ), MLT_PRODUCER( producer ) );
578 // Push the playlist back onto the stack
579 context_push_service( context, service );
581 mlt_service_close( entry );
584 static void on_end_tractor( deserialise_context context, const xmlChar *name )
587 mlt_service tractor = context_pop_service( context );
588 if ( tractor == NULL )
591 // Get the tractor's multitrack
592 mlt_producer multitrack = mlt_properties_get_data( mlt_service_properties( tractor ), "multitrack", NULL );
593 if ( multitrack != NULL )
595 // Inherit the producer's properties
596 mlt_properties properties = mlt_producer_properties( MLT_PRODUCER( tractor ) );
597 mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
598 mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
599 mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
602 // See if the tractor should be added to a playlist or multitrack
603 if ( add_producer( context, tractor, 0, mlt_producer_get_out( MLT_PRODUCER( tractor ) ) ) == 0 )
605 // Otherwise, push the tractor back onto the stack
606 context_push_service( context, tractor );
609 static void on_end_property( deserialise_context context, const xmlChar *name )
611 // Tell parser to stop building a tree
612 context->is_value = 0;
614 // See if there is a xml tree for the value
615 if ( context->property != NULL && context->value_doc != NULL )
620 // Serialise the tree to get value
621 xmlDocDumpMemory( context->value_doc, &value, &size );
622 mlt_properties_set( context->producer_properties, context->property, value );
624 xmlFreeDoc( context->value_doc );
625 context->value_doc = NULL;
628 // Close this property handling
629 free( context->property );
630 context->property = NULL;
633 static void on_end_producer( deserialise_context context, const xmlChar *name )
635 mlt_properties properties = context->producer_properties;
636 mlt_service service = NULL;
638 if ( properties == NULL )
641 char *resource = mlt_properties_get( properties, "resource" );
642 // Let Kino-SMIL src be a synonym for resource
643 if ( resource == NULL )
644 resource = mlt_properties_get( properties, "src" );
646 // Instantiate the producer
647 if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
650 strncpy( temp, mlt_properties_get( properties, "mlt_service" ), 1024 );
651 if ( resource != NULL )
654 strncat( temp, resource, 1023 - strlen( temp ) );
656 service = MLT_SERVICE( mlt_factory_producer( "fezzik", temp ) );
658 if ( service == NULL && resource != NULL )
660 char *root = mlt_properties_get( context->producer_map, "_root" );
661 char *full_resource = malloc( strlen( root ) + strlen( resource ) + 1 );
662 if ( resource[ 0 ] != '/' )
664 strcpy( full_resource, root );
665 strcat( full_resource, resource );
669 strcpy( full_resource, resource );
671 service = MLT_SERVICE( mlt_factory_producer( "fezzik", full_resource ) );
672 free( full_resource );
674 if ( service == NULL )
676 track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
678 // Add the producer to the producer map
679 if ( mlt_properties_get( properties, "id" ) != NULL )
680 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
682 // Handle in/out properties separately
683 mlt_position in = -1;
684 mlt_position out = -1;
687 if ( mlt_properties_get( properties, "in" ) != NULL )
688 in = mlt_properties_get_position( properties, "in" );
689 // Let Kino-SMIL clipBegin be a synonym for in
690 if ( mlt_properties_get( properties, "clipBegin" ) != NULL )
691 in = mlt_properties_get_position( properties, "clipBegin" );
693 if ( mlt_properties_get( properties, "out" ) != NULL )
694 out = mlt_properties_get_position( properties, "out" );
695 // Let Kino-SMIL clipEnd be a synonym for out
696 if ( mlt_properties_get( properties, "clipEnd" ) != NULL )
697 out = mlt_properties_get_position( properties, "clipEnd" );
700 mlt_properties_set( properties, "in", NULL );
701 mlt_properties_set( properties, "out", NULL );
703 mlt_properties_inherit( mlt_service_properties( service ), properties );
704 mlt_properties_close( properties );
705 context->producer_properties = NULL;
707 // See if the producer should be added to a playlist or multitrack
708 if ( add_producer( context, service, in, out ) == 0 )
710 // Otherwise, set in and out on...
711 if ( in != -1 || out != -1 )
713 // Get the parent service
714 mlt_service parent = context_pop_service( context );
715 if ( parent != NULL )
717 // Get the parent properties
718 properties = mlt_service_properties( parent );
720 char *resource = mlt_properties_get( properties, "resource" );
722 // Put the parent producer back
723 context_push_service( context, parent );
725 // If the parent is a track or entry
726 if ( resource && ( strcmp( resource, "<entry>" ) == 0 ) )
728 mlt_properties_set_position( properties, "in", in );
729 mlt_properties_set_position( properties, "out", out );
733 // Otherwise, set in and out on producer directly
734 mlt_producer_set_in_and_out( MLT_PRODUCER( service ), in, out );
739 // Otherwise, set in and out on producer directly
740 mlt_producer_set_in_and_out( MLT_PRODUCER( service ), in, out );
744 // Push the producer onto the stack
745 context_push_service( context, service );
749 static void on_end_filter( deserialise_context context, const xmlChar *name )
751 mlt_properties properties = context->producer_properties;
752 if ( properties == NULL )
758 mlt_service tractor = NULL;
760 // Get the producer from the stack
761 mlt_service producer = context_pop_service( context );
762 if ( producer == NULL )
765 // See if the producer is a tractor
766 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
767 if ( resource != NULL && strcmp( resource, "<tractor>" ) == 0 )
769 // If so, then get the next producer
771 producer = context_pop_service( context );
774 //fprintf( stderr, "connecting filter to %s\n", mlt_properties_get( mlt_service_properties( producer ), "resource" ) );
777 mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
778 if ( service == NULL )
780 context_push_service( context, producer );
783 track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
785 // Connect the filter to the producer
786 mlt_filter_connect( MLT_FILTER( service ), producer,
787 mlt_properties_get_int( properties, "track" ) );
789 // Set in and out from producer if non existant
790 if ( mlt_properties_get( properties, "in" ) == NULL )
791 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
792 if ( mlt_properties_get( properties, "out" ) == NULL )
793 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
795 // Propogate the properties
796 mlt_properties_inherit( mlt_service_properties( service ), properties );
797 mlt_properties_close( properties );
798 context->producer_properties = NULL;
799 properties = mlt_service_properties( service );
801 // Set in and out again due to inheritance
802 mlt_filter_set_in_and_out( MLT_FILTER( service ),
803 mlt_properties_get_position( properties, "in" ),
804 mlt_properties_get_position( properties, "out" ) );
806 // If a producer alias is in the producer_map, get it
807 snprintf( key, 10, "%p", producer );
808 if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
809 producer = mlt_properties_get_data( context->producer_map, key, NULL );
811 // Put the producer in the producer map
812 id = mlt_properties_get( mlt_service_properties( producer ), "id" );
814 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
816 // For filter chain support, add an alias to the producer map
817 snprintf( key, 10, "%p", service );
818 mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
820 // Push the filter onto the stack
821 context_push_service( context, service );
823 if ( tractor != NULL )
825 // Connect the tractor to the filter
826 mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
828 // Push the tractor back onto the stack
829 context_push_service( context, tractor );
833 static void on_end_transition( deserialise_context context, const xmlChar *name )
835 mlt_service tractor = NULL;
836 mlt_properties properties = context->producer_properties;
837 if ( properties == NULL )
840 // Get the producer from the stack
841 mlt_service producer = context_pop_service( context );
842 if ( producer == NULL )
845 // See if the producer is a tractor
846 char *resource = mlt_properties_get( mlt_service_properties( producer ), "resource" );
847 if ( resource != NULL && strcmp( resource, "<tractor>" ) == 0 )
849 // If so, then get the next producer
851 producer = context_pop_service( context );
854 // Create the transition
855 mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
856 if ( service == NULL )
858 context_push_service( context, producer );
861 track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
863 // Propogate the properties
864 mlt_properties_inherit( mlt_service_properties( service ), properties );
865 mlt_properties_close( properties );
866 context->producer_properties = NULL;
867 properties = mlt_service_properties( service );
869 // Set in and out again due to inheritance
870 mlt_transition_set_in_and_out( MLT_TRANSITION( service ),
871 mlt_properties_get_position( properties, "in" ),
872 mlt_properties_get_position( properties, "out" ) );
874 // Connect the transition to the producer
875 mlt_transition_connect( MLT_TRANSITION( service ), producer,
876 mlt_properties_get_int( properties, "a_track" ),
877 mlt_properties_get_int( properties, "b_track" ) );
879 // Push the transition onto the stack
880 context_push_service( context, service );
882 if ( tractor != NULL )
884 // Connect the tractor to the transition
885 mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
887 // Push the tractor back onto the stack
888 context_push_service( context, tractor );
892 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
894 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
895 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
897 //printf("on_start_element: %s\n", name );
898 context->branch[ context->depth ] ++;
901 // Build a tree from nodes within a property value
902 if ( context->is_value == 1 )
904 xmlNodePtr node = xmlNewNode( NULL, name );
906 if ( context->value_doc == NULL )
909 context->value_doc = xmlNewDoc( "1.0" );
910 xmlDocSetRootElement( context->value_doc, node );
914 // Append child to tree
915 xmlAddChild( context->stack_node[ context->stack_node_size - 1 ], node );
917 context_push_node( context, node );
919 // Set the attributes
920 for ( ; atts != NULL && *atts != NULL; atts += 2 )
921 xmlSetProp( node, atts[ 0 ], atts[ 1 ] );
923 else if ( strcmp( name, "tractor" ) == 0 )
924 on_start_tractor( context, name, atts );
925 else if ( strcmp( name, "multitrack" ) == 0 )
926 on_start_multitrack( context, name, atts );
927 else if ( strcmp( name, "playlist" ) == 0 || strcmp( name, "seq" ) == 0 || strcmp( name, "smil" ) == 0 )
928 on_start_playlist( context, name, atts );
929 else if ( strcmp( name, "producer" ) == 0 || strcmp( name, "video" ) == 0 )
930 on_start_producer( context, name, atts );
931 else if ( strcmp( name, "blank" ) == 0 )
932 on_start_blank( context, name, atts );
933 else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
934 on_start_entry_track( context, name, atts );
935 else if ( strcmp( name, "filter" ) == 0 )
936 on_start_filter( context, name, atts );
937 else if ( strcmp( name, "transition" ) == 0 )
938 on_start_transition( context, name, atts );
939 else if ( strcmp( name, "property" ) == 0 )
940 on_start_property( context, name, atts );
943 static void on_end_element( void *ctx, const xmlChar *name )
945 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
946 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
948 //printf("on_end_element: %s\n", name );
949 if ( context->is_value == 1 && strcmp( name, "property" ) != 0 )
950 context_pop_node( context );
951 else if ( strcmp( name, "multitrack" ) == 0 )
952 on_end_multitrack( context, name );
953 else if ( strcmp( name, "playlist" ) == 0 || strcmp( name, "seq" ) == 0 || strcmp( name, "smil" ) == 0 )
954 on_end_playlist( context, name );
955 else if ( strcmp( name, "track" ) == 0 )
956 on_end_track( context, name );
957 else if ( strcmp( name, "entry" ) == 0 )
958 on_end_entry( context, name );
959 else if ( strcmp( name, "tractor" ) == 0 )
960 on_end_tractor( context, name );
961 else if ( strcmp( name, "property" ) == 0 )
962 on_end_property( context, name );
963 else if ( strcmp( name, "producer" ) == 0 || strcmp( name, "video" ) == 0 )
964 on_end_producer( context, name );
965 else if ( strcmp( name, "filter" ) == 0 )
966 on_end_filter( context, name );
967 else if ( strcmp( name, "transition" ) == 0 )
968 on_end_transition( context, name );
970 context->branch[ context->depth ] = 0;
974 static void on_characters( void *ctx, const xmlChar *ch, int len )
976 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
977 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
978 char *value = calloc( len + 1, 1 );
981 strncpy( value, (const char*) ch, len );
983 if ( context->stack_node_size > 0 )
984 xmlNodeAddContent( context->stack_node[ context->stack_node_size - 1 ], ( xmlChar* )value );
986 // libxml2 generates an on_characters immediately after a get_entity within
987 // an element value, and we ignore it because it is called again during
988 // actual substitution.
989 else if ( context->property != NULL && context->producer_properties != NULL
990 && context->entity_is_replace == 0 )
992 char *s = mlt_properties_get( context->producer_properties, context->property );
995 // Append new text to existing content
996 char *new = calloc( strlen( s ) + len + 1, 1 );
998 strcat( new, value );
999 mlt_properties_set( context->producer_properties, context->property, new );
1003 mlt_properties_set( context->producer_properties, context->property, value );
1005 context->entity_is_replace = 0;
1010 /** Convert parameters parsed from resource into entity declarations.
1012 static void params_to_entities( deserialise_context context )
1014 if ( context->params != NULL )
1018 // Add our params as entitiy declarations
1019 for ( i = 0; i < mlt_properties_count( context->params ); i++ )
1021 xmlChar *name = ( xmlChar* )mlt_properties_get_name( context->params, i );
1022 xmlAddDocEntity( context->entity_doc, name, XML_INTERNAL_GENERAL_ENTITY,
1023 context->publicId, context->systemId, ( xmlChar* )mlt_properties_get( context->params, name ) );
1027 mlt_properties_close( context->params );
1028 context->params = NULL;
1032 // The following 3 facilitate entity substitution in the SAX parser
1033 static void on_internal_subset( void *ctx, const xmlChar* name,
1034 const xmlChar* publicId, const xmlChar* systemId )
1036 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1037 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1039 context->publicId = publicId;
1040 context->systemId = systemId;
1041 xmlCreateIntSubset( context->entity_doc, name, publicId, systemId );
1043 // Override default entities with our parameters
1044 params_to_entities( context );
1047 static void on_entity_declaration( void *ctx, const xmlChar* name, int type,
1048 const xmlChar* publicId, const xmlChar* systemId, xmlChar* content)
1050 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1051 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1053 xmlAddDocEntity( context->entity_doc, name, type, publicId, systemId, content );
1056 xmlEntityPtr on_get_entity( void *ctx, const xmlChar* name )
1058 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1059 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1060 xmlEntityPtr e = NULL;
1062 // Setup for entity declarations if not ready
1063 if ( xmlGetIntSubset( context->entity_doc ) == NULL )
1065 xmlCreateIntSubset( context->entity_doc, "westley", "", "" );
1066 context->publicId = "";
1067 context->systemId = "";
1070 // Add our parameters if not already
1071 params_to_entities( context );
1073 e = xmlGetDocEntity( context->entity_doc, name );
1075 // Send signal to on_characters that an entity substitutin is pending
1077 context->entity_is_replace = 1;
1082 /** Convert a hexadecimal character to its value.
1084 static int tohex( char p )
1086 return isdigit( p ) ? p - '0' : tolower( p ) - 'a' + 10;
1089 /** Decode a url-encoded string containing hexadecimal character sequences.
1091 static char *url_decode( char *dest, char *src )
1099 *p ++ = ( tohex( *( src + 1 ) ) << 4 ) | tohex( *( src + 2 ) );
1112 /** Extract the filename from a URL attaching parameters to a properties list.
1114 static void parse_url( mlt_properties properties, char *url )
1117 int n = strlen( url );
1121 for ( i = 0; i < n; i++ )
1138 if ( name != NULL && value != NULL )
1139 mlt_properties_set( properties, name, value );
1145 if ( name != NULL && value != NULL )
1146 mlt_properties_set( properties, name, value );
1149 mlt_producer producer_westley_init( char *url )
1153 xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
1154 struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
1155 mlt_properties properties = NULL;
1157 struct _xmlParserCtxt *xmlcontext;
1158 int well_formed = 0;
1159 char *filename = strdup( url );
1161 context->producer_map = mlt_properties_new();
1162 context->destructors = mlt_properties_new();
1163 context->params = mlt_properties_new();
1165 // Decode URL and parse parameters
1166 parse_url( context->params, url_decode( filename, url ) );
1168 // We need to track the number of registered filters
1169 mlt_properties_set_int( context->destructors, "registered", 0 );
1171 // We need the directory prefix which was used for the westley
1172 mlt_properties_set( context->producer_map, "_root", "" );
1173 if ( strchr( filename, '/' ) )
1176 mlt_properties_set( context->producer_map, "_root", filename );
1177 root = mlt_properties_get( context->producer_map, "_root" );
1178 *( strrchr( root, '/' ) + 1 ) = '\0';
1181 // Setup SAX callbacks
1182 sax->startElement = on_start_element;
1183 sax->endElement = on_end_element;
1184 sax->characters = on_characters;
1185 sax->cdataBlock = on_characters;
1186 sax->internalSubset = on_internal_subset;
1187 sax->entityDecl = on_entity_declaration;
1188 sax->getEntity = on_get_entity;
1190 // Setup libxml2 SAX parsing
1192 xmlSubstituteEntitiesDefault( 1 );
1193 // This is used to facilitate entity substitution in the SAX parser
1194 context->entity_doc = xmlNewDoc( "1.0" );
1195 xmlcontext = xmlCreateFileParserCtxt( filename );
1196 xmlcontext->sax = sax;
1197 xmlcontext->_private = ( void* )context;
1200 xmlParseDocument( xmlcontext );
1201 well_formed = xmlcontext->wellFormed;
1203 // Cleanup after parsing
1204 xmlFreeDoc( context->entity_doc );
1206 xmlcontext->sax = NULL;
1207 xmlcontext->_private = NULL;
1208 xmlFreeParserCtxt( xmlcontext );
1209 xmlMemoryDump( ); // for debugging
1211 // Get the last producer on the stack
1212 mlt_service service = context_pop_service( context );
1213 if ( well_formed && service != NULL )
1215 // Verify it is a producer service (mlt_type="mlt_producer")
1216 // (producer, playlist, multitrack)
1217 char *type = mlt_properties_get( mlt_service_properties( service ), "mlt_type" );
1218 if ( type == NULL || ( strcmp( type, "mlt_producer" ) != 0 && strcmp( type, "producer" ) != 0 ) )
1223 xmlDocPtr doc = westley_make_doc( service );
1224 xmlDocFormatDump( stdout, doc, 1 );
1229 if ( well_formed && service != NULL )
1232 // Need the complete producer list for various reasons
1233 properties = context->destructors;
1235 // Now make sure we don't have a reference to the service in the properties
1236 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
1238 char *name = mlt_properties_get_name( properties, i );
1239 if ( mlt_properties_get_data( properties, name, NULL ) == service )
1241 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
1246 // We are done referencing destructor property list
1247 // Set this var to service properties for convenience
1248 properties = mlt_service_properties( service );
1250 // make the returned service destroy the connected services
1251 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
1253 // Now assign additional properties
1254 mlt_properties_set( properties, "resource", url );
1256 // This tells consumer_westley not to deep copy
1257 mlt_properties_set( properties, "westley", "was here" );
1261 // Return null if not well formed
1265 mlt_properties_close( context->destructors );
1269 mlt_properties_close( context->producer_map );
1270 if ( context->params != NULL )
1271 mlt_properties_close( context->params );
1275 return MLT_PRODUCER( service );