src/modules/westley/producer_westley.c
[melted] / src / modules / westley / producer_westley.c
1 /*
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>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21 // TODO: destroy unreferenced producers (they are currently destroyed
22 // when the returned producer is closed).
23
24 #include "producer_westley.h"
25 #include <framework/mlt.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <stdio.h>
29 #include <ctype.h>
30 #include <unistd.h>
31
32 #include <libxml/parser.h>
33 #include <libxml/parserInternals.h> // for xmlCreateFileParserCtxt
34 #include <libxml/tree.h>
35
36 #define STACK_SIZE 1000
37 #define BRANCH_SIG_LEN 4000
38
39 #undef DEBUG
40 #ifdef DEBUG
41 extern xmlDocPtr westley_make_doc( mlt_service service );
42 #endif
43
44 enum service_type
45 {
46 mlt_invalid_type,
47 mlt_unknown_type,
48 mlt_producer_type,
49 mlt_playlist_type,
50 mlt_entry_type,
51 mlt_tractor_type,
52 mlt_multitrack_type,
53 mlt_filter_type,
54 mlt_transition_type,
55 mlt_consumer_type,
56 mlt_field_type,
57 mlt_services_type,
58 mlt_dummy_filter_type,
59 mlt_dummy_transition_type,
60 mlt_dummy_producer_type,
61 };
62
63 struct deserialise_context_s
64 {
65 enum service_type stack_types[ STACK_SIZE ];
66 mlt_service stack_service[ STACK_SIZE ];
67 int stack_service_size;
68 mlt_properties producer_map;
69 mlt_properties destructors;
70 char *property;
71 int is_value;
72 xmlDocPtr value_doc;
73 xmlNodePtr stack_node[ STACK_SIZE ];
74 int stack_node_size;
75 xmlDocPtr entity_doc;
76 int entity_is_replace;
77 int depth;
78 int branch[ STACK_SIZE ];
79 const xmlChar *publicId;
80 const xmlChar *systemId;
81 mlt_properties params;
82 };
83 typedef struct deserialise_context_s *deserialise_context;
84
85 /** Convert the numerical current branch address to a dot-delimited string.
86 */
87 static char *serialise_branch( deserialise_context this, char *s )
88 {
89 int i;
90
91 s[0] = 0;
92 for ( i = 0; i < this->depth; i++ )
93 {
94 int len = strlen( s );
95 snprintf( s + len, BRANCH_SIG_LEN - len, "%d.", this->branch[ i ] );
96 }
97 return s;
98 }
99
100 /** Push a service.
101 */
102
103 static int context_push_service( deserialise_context this, mlt_service that, enum service_type type )
104 {
105 int ret = this->stack_service_size >= STACK_SIZE - 1;
106 if ( ret == 0 )
107 {
108 this->stack_service[ this->stack_service_size ] = that;
109 this->stack_types[ this->stack_service_size++ ] = type;
110
111 // Record the tree branch on which this service lives
112 if ( that != NULL && mlt_properties_get( MLT_SERVICE_PROPERTIES( that ), "_westley_branch" ) == NULL )
113 {
114 char s[ BRANCH_SIG_LEN ];
115 mlt_properties_set( MLT_SERVICE_PROPERTIES( that ), "_westley_branch", serialise_branch( this, s ) );
116 }
117 }
118 return ret;
119 }
120
121 /** Pop a service.
122 */
123
124 static mlt_service context_pop_service( deserialise_context this, enum service_type *type )
125 {
126 mlt_service result = NULL;
127 if ( this->stack_service_size > 0 )
128 {
129 result = this->stack_service[ -- this->stack_service_size ];
130 if ( type != NULL )
131 *type = this->stack_types[ this->stack_service_size ];
132 }
133 return result;
134 }
135
136 /** Push a node.
137 */
138
139 static int context_push_node( deserialise_context this, xmlNodePtr node )
140 {
141 int ret = this->stack_node_size >= STACK_SIZE - 1;
142 if ( ret == 0 )
143 this->stack_node[ this->stack_node_size ++ ] = node;
144 return ret;
145 }
146
147 /** Pop a node.
148 */
149
150 static xmlNodePtr context_pop_node( deserialise_context this )
151 {
152 xmlNodePtr result = NULL;
153 if ( this->stack_node_size > 0 )
154 result = this->stack_node[ -- this->stack_node_size ];
155 return result;
156 }
157
158
159 // Set the destructor on a new service
160 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
161 {
162 int registered = mlt_properties_get_int( properties, "registered" );
163 char *key = mlt_properties_get( properties, "registered" );
164 mlt_properties_set_data( properties, key, service, 0, destructor, NULL );
165 mlt_properties_set_int( properties, "registered", ++ registered );
166 }
167
168
169 // Prepend the property value with the document root
170 static inline void qualify_property( deserialise_context context, mlt_properties properties, char *name )
171 {
172 char *resource = mlt_properties_get( properties, name );
173 if ( resource != NULL )
174 {
175 // Qualify file name properties
176 char *root = mlt_properties_get( context->producer_map, "root" );
177 if ( root != NULL && strcmp( root, "" ) )
178 {
179 char *full_resource = malloc( strlen( root ) + strlen( resource ) + 2 );
180 if ( resource[ 0 ] != '/' && strchr( resource, ':' ) == NULL )
181 {
182 strcpy( full_resource, root );
183 strcat( full_resource, "/" );
184 strcat( full_resource, resource );
185 }
186 else
187 {
188 strcpy( full_resource, resource );
189 }
190 mlt_properties_set( properties, name, full_resource );
191 free( full_resource );
192 }
193 }
194 }
195
196
197 /** This function adds a producer to a playlist or multitrack when
198 there is no entry or track element.
199 */
200
201 static int add_producer( deserialise_context context, mlt_service service, mlt_position in, mlt_position out )
202 {
203 // Return value (0 = service remains top of stack, 1 means it can be removed)
204 int result = 0;
205
206 // Get the parent producer
207 enum service_type type;
208 mlt_service container = context_pop_service( context, &type );
209 int contained = 0;
210
211 if ( service != NULL && container != NULL )
212 {
213 char *container_branch = mlt_properties_get( MLT_SERVICE_PROPERTIES( container ), "_westley_branch" );
214 char *service_branch = mlt_properties_get( MLT_SERVICE_PROPERTIES( service ), "_westley_branch" );
215 contained = !strncmp( container_branch, service_branch, strlen( container_branch ) );
216 }
217
218 if ( contained )
219 {
220 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
221 char *hide_s = mlt_properties_get( properties, "hide" );
222
223 // Indicate that this service is no longer top of stack
224 result = 1;
225
226 switch( type )
227 {
228 case mlt_tractor_type:
229 {
230 mlt_multitrack multitrack = mlt_tractor_multitrack( MLT_TRACTOR( container ) );
231 mlt_multitrack_connect( multitrack, MLT_PRODUCER( service ), mlt_multitrack_count( multitrack ) );
232 }
233 break;
234 case mlt_multitrack_type:
235 {
236 mlt_multitrack_connect( MLT_MULTITRACK( container ),
237 MLT_PRODUCER( service ),
238 mlt_multitrack_count( MLT_MULTITRACK( container ) ) );
239 }
240 break;
241 case mlt_playlist_type:
242 {
243 mlt_playlist_append_io( MLT_PLAYLIST( container ), MLT_PRODUCER( service ), in, out );
244 }
245 break;
246 default:
247 result = 0;
248 fprintf( stderr, "Producer defined inside something that isn't a container\n" );
249 break;
250 };
251
252 // Set the hide state of the track producer
253 if ( hide_s != NULL )
254 {
255 if ( strcmp( hide_s, "video" ) == 0 )
256 mlt_properties_set_int( properties, "hide", 1 );
257 else if ( strcmp( hide_s, "audio" ) == 0 )
258 mlt_properties_set_int( properties, "hide", 2 );
259 else if ( strcmp( hide_s, "both" ) == 0 )
260 mlt_properties_set_int( properties, "hide", 3 );
261 }
262 }
263
264 // Put the parent producer back
265 if ( container != NULL )
266 context_push_service( context, container, type );
267
268 return result;
269 }
270
271 /** Attach filters defined on that to this.
272 */
273
274 static void attach_filters( mlt_service this, mlt_service that )
275 {
276 if ( that != NULL )
277 {
278 int i = 0;
279 mlt_filter filter = NULL;
280 for ( i = 0; ( filter = mlt_service_filter( that, i ) ) != NULL; i ++ )
281 {
282 mlt_service_attach( this, filter );
283 attach_filters( MLT_FILTER_SERVICE( filter ), MLT_FILTER_SERVICE( filter ) );
284 }
285 }
286 }
287
288 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
289 {
290 mlt_tractor tractor = mlt_tractor_new( );
291 mlt_service service = MLT_TRACTOR_SERVICE( tractor );
292 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
293
294 track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
295
296 for ( ; atts != NULL && *atts != NULL; atts += 2 )
297 mlt_properties_set( MLT_SERVICE_PROPERTIES( service ), (char*) atts[0], atts[1] == NULL ? "" : (char*) atts[1] );
298
299 mlt_properties_set_int( MLT_TRACTOR_PROPERTIES( tractor ), "global_feed", 1 );
300
301 if ( mlt_properties_get( properties, "id" ) != NULL )
302 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
303
304 context_push_service( context, service, mlt_tractor_type );
305 }
306
307 static void on_end_tractor( deserialise_context context, const xmlChar *name )
308 {
309 // Get the tractor
310 enum service_type type;
311 mlt_service tractor = context_pop_service( context, &type );
312
313 if ( tractor != NULL && type == mlt_tractor_type )
314 {
315 // See if the tractor should be added to a playlist or multitrack
316 if ( add_producer( context, tractor, 0, mlt_producer_get_out( MLT_PRODUCER( tractor ) ) ) == 0 )
317 context_push_service( context, tractor, type );
318 }
319 else
320 {
321 fprintf( stderr, "Invalid state for tractor\n" );
322 }
323 }
324
325 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
326 {
327 enum service_type type;
328 mlt_service parent = context_pop_service( context, &type );
329
330 // If we don't have a parent, then create one now, providing we're in a state where we can
331 if ( parent == NULL || ( type == mlt_playlist_type || type == mlt_multitrack_type ) )
332 {
333 mlt_tractor tractor = NULL;
334 // Push the parent back
335 if ( parent != NULL )
336 context_push_service( context, parent, type );
337
338 // Create a tractor to contain the multitrack
339 tractor = mlt_tractor_new( );
340 parent = MLT_TRACTOR_SERVICE( tractor );
341 track_service( context->destructors, parent, (mlt_destructor) mlt_tractor_close );
342 type = mlt_tractor_type;
343
344 // Flag it as a synthesised tractor for clean up later
345 mlt_properties_set_int( MLT_SERVICE_PROPERTIES( parent ), "fezzik_synth", 1 );
346 }
347
348 if ( type == mlt_tractor_type )
349 {
350 mlt_service service = MLT_SERVICE( mlt_tractor_multitrack( MLT_TRACTOR( parent ) ) );
351 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
352 for ( ; atts != NULL && *atts != NULL; atts += 2 )
353 mlt_properties_set( properties, (char*) atts[0], atts[1] == NULL ? "" : (char*) atts[1] );
354
355 if ( mlt_properties_get( properties, "id" ) != NULL )
356 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties,"id" ), service, 0, NULL, NULL );
357
358 context_push_service( context, parent, type );
359 context_push_service( context, service, mlt_multitrack_type );
360 }
361 else
362 {
363 fprintf( stderr, "Invalid multitrack position\n" );
364 }
365 }
366
367 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
368 {
369 // Get the multitrack from the stack
370 enum service_type type;
371 mlt_service service = context_pop_service( context, &type );
372
373 if ( service == NULL || type != mlt_multitrack_type )
374 fprintf( stderr, "End multitrack in the wrong state...\n" );
375 }
376
377 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
378 {
379 mlt_playlist playlist = mlt_playlist_init( );
380 mlt_service service = MLT_PLAYLIST_SERVICE( playlist );
381 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
382
383 track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
384
385 for ( ; atts != NULL && *atts != NULL; atts += 2 )
386 {
387 mlt_properties_set( properties, (char*) atts[0], atts[1] == NULL ? "" : (char*) atts[1] );
388
389 // Out will be overwritten later as we append, so we need to save it
390 if ( strcmp( atts[ 0 ], "out" ) == 0 )
391 mlt_properties_set( properties, "_westley.out", ( char* )atts[ 1 ] );
392 }
393
394 if ( mlt_properties_get( properties, "id" ) != NULL )
395 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
396
397 context_push_service( context, service, mlt_playlist_type );
398 }
399
400 static void on_end_playlist( deserialise_context context, const xmlChar *name )
401 {
402 // Get the playlist from the stack
403 enum service_type type;
404 mlt_service service = context_pop_service( context, &type );
405
406 if ( service != NULL && type == mlt_playlist_type )
407 {
408 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
409 mlt_position in = mlt_properties_get_position( properties, "in" );
410 mlt_position out = mlt_properties_get_position( properties, "out" );
411
412 // See if the playlist should be added to a playlist or multitrack
413 if ( add_producer( context, service, in, out ) == 0 )
414 context_push_service( context, service, type );
415 }
416 else
417 {
418 fprintf( stderr, "Invalid state of playlist end\n" );
419 }
420 }
421
422 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
423 {
424 // use a dummy service to hold properties to allow arbitrary nesting
425 mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
426 mlt_service_init( service, NULL );
427
428 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
429
430 context_push_service( context, service, mlt_dummy_producer_type );
431
432 for ( ; atts != NULL && *atts != NULL; atts += 2 )
433 mlt_properties_set( properties, (char*) atts[0], atts[1] == NULL ? "" : (char*) atts[1] );
434 }
435
436 static void on_end_producer( deserialise_context context, const xmlChar *name )
437 {
438 enum service_type type;
439 mlt_service service = context_pop_service( context, &type );
440 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
441
442 if ( service != NULL && type == mlt_dummy_producer_type )
443 {
444 mlt_service producer = NULL;
445
446 qualify_property( context, properties, "resource" );
447 char *resource = mlt_properties_get( properties, "resource" );
448
449 // Let Kino-SMIL src be a synonym for resource
450 if ( resource == NULL )
451 {
452 qualify_property( context, properties, "src" );
453 resource = mlt_properties_get( properties, "src" );
454 }
455
456 // Instantiate the producer
457 if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
458 {
459 char temp[ 1024 ];
460 strncpy( temp, mlt_properties_get( properties, "mlt_service" ), 1024 );
461 if ( resource != NULL )
462 {
463 strcat( temp, ":" );
464 strncat( temp, resource, 1023 - strlen( temp ) );
465 }
466 producer = MLT_SERVICE( mlt_factory_producer( "fezzik", temp ) );
467 }
468
469 // Just in case the plugin requested doesn't exist...
470 if ( producer == NULL && resource != NULL )
471 producer = MLT_SERVICE( mlt_factory_producer( "fezzik", resource ) );
472
473 if ( producer == NULL )
474 producer = MLT_SERVICE( mlt_factory_producer( "fezzik", "+INVALID.txt" ) );
475
476 // Track this producer
477 track_service( context->destructors, producer, (mlt_destructor) mlt_producer_close );
478
479 // Propogate the properties
480 qualify_property( context, properties, "resource" );
481 qualify_property( context, properties, "luma" );
482 qualify_property( context, properties, "luma.resource" );
483 qualify_property( context, properties, "composite.luma" );
484 qualify_property( context, properties, "producer.resource" );
485
486 // Handle in/out properties separately
487 mlt_position in = -1;
488 mlt_position out = -1;
489
490 // Get in
491 if ( mlt_properties_get( properties, "in" ) != NULL )
492 in = mlt_properties_get_position( properties, "in" );
493 // Let Kino-SMIL clipBegin be a synonym for in
494 if ( mlt_properties_get( properties, "clipBegin" ) != NULL )
495 in = mlt_properties_get_position( properties, "clipBegin" );
496 // Get out
497 if ( mlt_properties_get( properties, "out" ) != NULL )
498 out = mlt_properties_get_position( properties, "out" );
499 // Let Kino-SMIL clipEnd be a synonym for out
500 if ( mlt_properties_get( properties, "clipEnd" ) != NULL )
501 out = mlt_properties_get_position( properties, "clipEnd" );
502
503 // Remove in and out
504 mlt_properties_set( properties, "in", NULL );
505 mlt_properties_set( properties, "out", NULL );
506
507 // Inherit the properties
508 mlt_properties_inherit( MLT_SERVICE_PROPERTIES( producer ), properties );
509
510 // Attach all filters from service onto producer
511 attach_filters( producer, service );
512
513 // Add the producer to the producer map
514 if ( mlt_properties_get( properties, "id" ) != NULL )
515 mlt_properties_set_data( context->producer_map, mlt_properties_get(properties, "id"), producer, 0, NULL, NULL );
516
517 // See if the producer should be added to a playlist or multitrack
518 if ( add_producer( context, producer, in, out ) == 0 )
519 {
520 // Otherwise, set in and out on...
521 if ( in != -1 || out != -1 )
522 {
523 // Get the parent service
524 enum service_type type;
525 mlt_service parent = context_pop_service( context, &type );
526 if ( parent != NULL )
527 {
528 // Get the parent properties
529 properties = MLT_SERVICE_PROPERTIES( parent );
530
531 char *resource = mlt_properties_get( properties, "resource" );
532
533 // Put the parent producer back
534 context_push_service( context, parent, type );
535
536 // If the parent is a track or entry
537 if ( resource && ( strcmp( resource, "<entry>" ) == 0 ) )
538 {
539 mlt_properties_set_position( properties, "in", in );
540 mlt_properties_set_position( properties, "out", out );
541 }
542 else
543 {
544 // Otherwise, set in and out on producer directly
545 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ), in, out );
546 }
547 }
548 else
549 {
550 // Otherwise, set in and out on producer directly
551 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ), in, out );
552 }
553 }
554
555 // Push the producer onto the stack
556 context_push_service( context, producer, mlt_producer_type );
557 }
558
559 mlt_service_close( service );
560 }
561 }
562
563 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
564 {
565 // Get the playlist from the stack
566 enum service_type type;
567 mlt_service service = context_pop_service( context, &type );
568 mlt_position length = 0;
569
570 if ( type == mlt_playlist_type && service != NULL )
571 {
572 // Look for the length attribute
573 for ( ; atts != NULL && *atts != NULL; atts += 2 )
574 {
575 if ( strcmp( atts[0], "length" ) == 0 )
576 {
577 length = atoll( atts[1] );
578 break;
579 }
580 }
581
582 // Append a blank to the playlist
583 mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
584
585 // Push the playlist back onto the stack
586 context_push_service( context, service, type );
587 }
588 else
589 {
590 fprintf( stderr, "blank without a playlist - a definite no no\n" );
591 }
592 }
593
594 static void on_start_entry( deserialise_context context, const xmlChar *name, const xmlChar **atts)
595 {
596 mlt_producer entry = NULL;
597 mlt_properties temp = mlt_properties_new( );
598
599 for ( ; atts != NULL && *atts != NULL; atts += 2 )
600 {
601 mlt_properties_set( temp, (char*) atts[0], atts[1] == NULL ? "" : (char*) atts[1] );
602
603 // Look for the producer attribute
604 if ( strcmp( atts[ 0 ], "producer" ) == 0 )
605 {
606 mlt_producer producer = mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL );
607 if ( producer != NULL )
608 mlt_properties_set_data( temp, "producer", producer, 0, NULL, NULL );
609 }
610 }
611
612 // If we have a valid entry
613 if ( mlt_properties_get_data( temp, "producer", NULL ) != NULL )
614 {
615 mlt_playlist_clip_info info;
616 enum service_type parent_type;
617 mlt_service parent = context_pop_service( context, &parent_type );
618 mlt_producer producer = mlt_properties_get_data( temp, "producer", NULL );
619
620 if ( parent_type == mlt_playlist_type )
621 {
622 // Append the producer to the playlist
623 if ( mlt_properties_get( temp, "in" ) != NULL || mlt_properties_get( temp, "out" ) != NULL )
624 {
625 mlt_playlist_append_io( MLT_PLAYLIST( parent ), producer,
626 mlt_properties_get_position( temp, "in" ),
627 mlt_properties_get_position( temp, "out" ) );
628 }
629 else
630 {
631 mlt_playlist_append( MLT_PLAYLIST( parent ), producer );
632 }
633
634 // Handle the repeat property
635 if ( mlt_properties_get_int( temp, "repeat" ) > 0 )
636 {
637 mlt_playlist_repeat_clip( MLT_PLAYLIST( parent ),
638 mlt_playlist_count( MLT_PLAYLIST( parent ) ) - 1,
639 mlt_properties_get_int( temp, "repeat" ) );
640 }
641
642 mlt_playlist_get_clip_info( MLT_PLAYLIST( parent ), &info, mlt_playlist_count( MLT_PLAYLIST( parent ) ) - 1 );
643 entry = info.cut;
644 }
645 else
646 {
647 fprintf( stderr, "Entry not part of a playlist...\n" );
648 }
649
650 context_push_service( context, parent, parent_type );
651 }
652
653 // Push the cut onto the stack
654 context_push_service( context, MLT_PRODUCER_SERVICE( entry ), mlt_entry_type );
655
656 mlt_properties_close( temp );
657 }
658
659 static void on_end_entry( deserialise_context context, const xmlChar *name )
660 {
661 // Get the entry from the stack
662 enum service_type entry_type;
663 mlt_service entry = context_pop_service( context, &entry_type );
664
665 if ( entry == NULL && entry_type != mlt_entry_type )
666 {
667 fprintf( stderr, "Invalid state at end of entry\n" );
668 }
669 }
670
671 static void on_start_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
672 {
673 // use a dummy service to hold properties to allow arbitrary nesting
674 mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
675 mlt_service_init( service, NULL );
676
677 // Push the dummy service onto the stack
678 context_push_service( context, service, mlt_entry_type );
679
680 mlt_properties_set( MLT_SERVICE_PROPERTIES( service ), "resource", "<track>" );
681
682 for ( ; atts != NULL && *atts != NULL; atts += 2 )
683 {
684 mlt_properties_set( MLT_SERVICE_PROPERTIES( service ), (char*) atts[0], atts[1] == NULL ? "" : (char*) atts[1] );
685
686 // Look for the producer attribute
687 if ( strcmp( atts[ 0 ], "producer" ) == 0 )
688 {
689 mlt_producer producer = mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL );
690 if ( producer != NULL )
691 mlt_properties_set_data( MLT_SERVICE_PROPERTIES( service ), "producer", producer, 0, NULL, NULL );
692 }
693 }
694 }
695
696 static void on_end_track( deserialise_context context, const xmlChar *name )
697 {
698 // Get the track from the stack
699 enum service_type track_type;
700 mlt_service track = context_pop_service( context, &track_type );
701
702 if ( track != NULL && track_type == mlt_entry_type )
703 {
704 mlt_properties track_props = MLT_SERVICE_PROPERTIES( track );
705 enum service_type parent_type;
706 mlt_service parent = context_pop_service( context, &parent_type );
707 mlt_multitrack multitrack = NULL;
708
709 mlt_producer producer = mlt_properties_get_data( track_props, "producer", NULL );
710 mlt_properties producer_props = MLT_PRODUCER_PROPERTIES( producer );
711
712 if ( parent_type == mlt_tractor_type )
713 multitrack = mlt_tractor_multitrack( MLT_TRACTOR( parent ) );
714 else if ( parent_type == mlt_multitrack_type )
715 multitrack = MLT_MULTITRACK( parent );
716 else
717 fprintf( stderr, "track contained in an invalid container\n" );
718
719 if ( multitrack != NULL )
720 {
721 // Set producer i/o if specified
722 if ( mlt_properties_get( track_props, "in" ) != NULL ||
723 mlt_properties_get( track_props, "out" ) != NULL )
724 {
725 mlt_producer cut = mlt_producer_cut( MLT_PRODUCER( producer ),
726 mlt_properties_get_position( track_props, "in" ),
727 mlt_properties_get_position( track_props, "out" ) );
728 mlt_multitrack_connect( multitrack, cut, mlt_multitrack_count( multitrack ) );
729 mlt_properties_inherit( MLT_PRODUCER_PROPERTIES( cut ), track_props );
730 track_props = MLT_PRODUCER_PROPERTIES( cut );
731 mlt_producer_close( cut );
732 }
733 else
734 {
735 mlt_multitrack_connect( multitrack, producer, mlt_multitrack_count( multitrack ) );
736 }
737
738 // Set the hide state of the track producer
739 char *hide_s = mlt_properties_get( track_props, "hide" );
740 if ( hide_s != NULL )
741 {
742 if ( strcmp( hide_s, "video" ) == 0 )
743 mlt_properties_set_int( producer_props, "hide", 1 );
744 else if ( strcmp( hide_s, "audio" ) == 0 )
745 mlt_properties_set_int( producer_props, "hide", 2 );
746 else if ( strcmp( hide_s, "both" ) == 0 )
747 mlt_properties_set_int( producer_props, "hide", 3 );
748 }
749 }
750
751 if ( parent != NULL )
752 context_push_service( context, parent, parent_type );
753
754 mlt_service_close( track );
755 }
756 else
757 {
758 fprintf( stderr, "Invalid state at end of track\n" );
759 }
760 }
761
762 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
763 {
764 // use a dummy service to hold properties to allow arbitrary nesting
765 mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
766 mlt_service_init( service, NULL );
767
768 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
769
770 context_push_service( context, service, mlt_dummy_filter_type );
771
772 // Set the properties
773 for ( ; atts != NULL && *atts != NULL; atts += 2 )
774 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
775 }
776
777 static void on_end_filter( deserialise_context context, const xmlChar *name )
778 {
779 enum service_type type;
780 mlt_service service = context_pop_service( context, &type );
781 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
782
783 enum service_type parent_type;
784 mlt_service parent = context_pop_service( context, &parent_type );
785
786 if ( service != NULL && type == mlt_dummy_filter_type )
787 {
788 mlt_service filter = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
789 mlt_properties filter_props = MLT_SERVICE_PROPERTIES( filter );
790
791 track_service( context->destructors, filter, (mlt_destructor) mlt_filter_close );
792
793 // Propogate the properties
794 qualify_property( context, properties, "resource" );
795 qualify_property( context, properties, "luma" );
796 qualify_property( context, properties, "luma.resource" );
797 qualify_property( context, properties, "composite.luma" );
798 qualify_property( context, properties, "producer.resource" );
799 mlt_properties_inherit( filter_props, properties );
800
801 // Attach all filters from service onto filter
802 attach_filters( filter, service );
803
804 // Associate the filter with the parent
805 if ( parent != NULL )
806 {
807 if ( parent_type == mlt_tractor_type )
808 {
809 mlt_field field = mlt_tractor_field( MLT_TRACTOR( parent ) );
810 mlt_field_plant_filter( field, MLT_FILTER( filter ), mlt_properties_get_int( properties, "track" ) );
811 mlt_filter_set_in_and_out( MLT_FILTER( filter ),
812 mlt_properties_get_int( properties, "in" ),
813 mlt_properties_get_int( properties, "out" ) );
814 }
815 else
816 {
817 mlt_service_attach( parent, MLT_FILTER( filter ) );
818 }
819
820 // Put the parent back on the stack
821 context_push_service( context, parent, parent_type );
822 }
823 else
824 {
825 fprintf( stderr, "filter closed with invalid parent...\n" );
826 }
827
828 // Close the dummy filter service
829 mlt_service_close( service );
830 }
831 else
832 {
833 fprintf( stderr, "Invalid top of stack on filter close\n" );
834 }
835 }
836
837 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
838 {
839 // use a dummy service to hold properties to allow arbitrary nesting
840 mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
841 mlt_service_init( service, NULL );
842
843 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
844
845 context_push_service( context, service, mlt_dummy_transition_type );
846
847 // Set the properties
848 for ( ; atts != NULL && *atts != NULL; atts += 2 )
849 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
850 }
851
852 static void on_end_transition( deserialise_context context, const xmlChar *name )
853 {
854 enum service_type type;
855 mlt_service service = context_pop_service( context, &type );
856 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
857
858 enum service_type parent_type;
859 mlt_service parent = context_pop_service( context, &parent_type );
860
861 if ( service != NULL && type == mlt_dummy_transition_type )
862 {
863 mlt_service effect = MLT_SERVICE( mlt_factory_transition(mlt_properties_get(properties,"mlt_service"), NULL ) );
864 mlt_properties effect_props = MLT_SERVICE_PROPERTIES( effect );
865
866 track_service( context->destructors, effect, (mlt_destructor) mlt_transition_close );
867
868 // Propogate the properties
869 qualify_property( context, properties, "resource" );
870 qualify_property( context, properties, "luma" );
871 qualify_property( context, properties, "luma.resource" );
872 qualify_property( context, properties, "composite.luma" );
873 qualify_property( context, properties, "producer.resource" );
874 mlt_properties_inherit( effect_props, properties );
875
876 // Attach all filters from service onto effect
877 attach_filters( effect, service );
878
879 // Associate the filter with the parent
880 if ( parent != NULL )
881 {
882 if ( parent_type == mlt_tractor_type )
883 {
884 mlt_field field = mlt_tractor_field( MLT_TRACTOR( parent ) );
885 if ( mlt_properties_get_int( properties, "a_track" ) == mlt_properties_get_int( properties, "b_track" ) )
886 mlt_properties_set_int( properties, "b_track", mlt_properties_get_int( properties, "a_track" ) + 1 );
887 mlt_field_plant_transition( field, MLT_TRANSITION( effect ),
888 mlt_properties_get_int( properties, "a_track" ),
889 mlt_properties_get_int( properties, "b_track" ) );
890 mlt_transition_set_in_and_out( MLT_TRANSITION( effect ),
891 mlt_properties_get_int( properties, "in" ),
892 mlt_properties_get_int( properties, "out" ) );
893 }
894 else
895 {
896 fprintf( stderr, "Misplaced transition - ignoring\n" );
897 }
898
899 // Put the parent back on the stack
900 context_push_service( context, parent, parent_type );
901 }
902 else
903 {
904 fprintf( stderr, "transition closed with invalid parent...\n" );
905 }
906
907 // Close the dummy filter service
908 mlt_service_close( service );
909 }
910 else
911 {
912 fprintf( stderr, "Invalid top of stack on transition close\n" );
913 }
914 }
915
916 static void on_start_property( deserialise_context context, const xmlChar *name, const xmlChar **atts)
917 {
918 enum service_type type;
919 mlt_service service = context_pop_service( context, &type );
920 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
921 char *value = NULL;
922
923 if ( service != NULL )
924 {
925 // Set the properties
926 for ( ; atts != NULL && *atts != NULL; atts += 2 )
927 {
928 if ( strcmp( atts[ 0 ], "name" ) == 0 )
929 context->property = strdup( atts[ 1 ] );
930 else if ( strcmp( atts[ 0 ], "value" ) == 0 )
931 value = (char*) atts[ 1 ];
932 }
933
934 if ( context->property != NULL )
935 mlt_properties_set( properties, context->property, value == NULL ? "" : value );
936
937 // Tell parser to collect any further nodes for serialisation
938 context->is_value = 1;
939
940 context_push_service( context, service, type );
941 }
942 else
943 {
944 fprintf( stderr, "Property without a service '%s'?\n", ( char * )name );
945 }
946 }
947
948 static void on_end_property( deserialise_context context, const xmlChar *name )
949 {
950 enum service_type type;
951 mlt_service service = context_pop_service( context, &type );
952 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
953
954 if ( service != NULL )
955 {
956 // Tell parser to stop building a tree
957 context->is_value = 0;
958
959 // See if there is a xml tree for the value
960 if ( context->property != NULL && context->value_doc != NULL )
961 {
962 xmlChar *value;
963 int size;
964
965 // Serialise the tree to get value
966 xmlDocDumpMemory( context->value_doc, &value, &size );
967 mlt_properties_set( properties, context->property, value );
968 xmlFree( value );
969 xmlFreeDoc( context->value_doc );
970 context->value_doc = NULL;
971 }
972
973 // Close this property handling
974 free( context->property );
975 context->property = NULL;
976
977 context_push_service( context, service, type );
978 }
979 else
980 {
981 fprintf( stderr, "Property without a service '%s'??\n", (char *)name );
982 }
983 }
984
985 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
986 {
987 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
988 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
989
990 //printf("on_start_element: %s\n", name );
991 context->branch[ context->depth ] ++;
992 context->depth ++;
993
994 // Build a tree from nodes within a property value
995 if ( context->is_value == 1 )
996 {
997 xmlNodePtr node = xmlNewNode( NULL, name );
998
999 if ( context->value_doc == NULL )
1000 {
1001 // Start a new tree
1002 context->value_doc = xmlNewDoc( "1.0" );
1003 xmlDocSetRootElement( context->value_doc, node );
1004 }
1005 else
1006 {
1007 // Append child to tree
1008 xmlAddChild( context->stack_node[ context->stack_node_size - 1 ], node );
1009 }
1010 context_push_node( context, node );
1011
1012 // Set the attributes
1013 for ( ; atts != NULL && *atts != NULL; atts += 2 )
1014 xmlSetProp( node, atts[ 0 ], atts[ 1 ] );
1015 }
1016 else if ( strcmp( name, "tractor" ) == 0 )
1017 on_start_tractor( context, name, atts );
1018 else if ( strcmp( name, "multitrack" ) == 0 )
1019 on_start_multitrack( context, name, atts );
1020 else if ( strcmp( name, "playlist" ) == 0 || strcmp( name, "seq" ) == 0 || strcmp( name, "smil" ) == 0 )
1021 on_start_playlist( context, name, atts );
1022 else if ( strcmp( name, "producer" ) == 0 || strcmp( name, "video" ) == 0 )
1023 on_start_producer( context, name, atts );
1024 else if ( strcmp( name, "blank" ) == 0 )
1025 on_start_blank( context, name, atts );
1026 else if ( strcmp( name, "entry" ) == 0 )
1027 on_start_entry( context, name, atts );
1028 else if ( strcmp( name, "track" ) == 0 )
1029 on_start_track( context, name, atts );
1030 else if ( strcmp( name, "filter" ) == 0 )
1031 on_start_filter( context, name, atts );
1032 else if ( strcmp( name, "transition" ) == 0 )
1033 on_start_transition( context, name, atts );
1034 else if ( strcmp( name, "property" ) == 0 )
1035 on_start_property( context, name, atts );
1036 else if ( strcmp( name, "westley" ) == 0 )
1037 for ( ; atts != NULL && *atts != NULL; atts += 2 )
1038 mlt_properties_set( context->producer_map, ( char * )atts[ 0 ], ( char * )atts[ 1 ] );
1039 }
1040
1041 static void on_end_element( void *ctx, const xmlChar *name )
1042 {
1043 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1044 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1045
1046 //printf("on_end_element: %s\n", name );
1047 if ( context->is_value == 1 && strcmp( name, "property" ) != 0 )
1048 context_pop_node( context );
1049 else if ( strcmp( name, "multitrack" ) == 0 )
1050 on_end_multitrack( context, name );
1051 else if ( strcmp( name, "playlist" ) == 0 || strcmp( name, "seq" ) == 0 || strcmp( name, "smil" ) == 0 )
1052 on_end_playlist( context, name );
1053 else if ( strcmp( name, "track" ) == 0 )
1054 on_end_track( context, name );
1055 else if ( strcmp( name, "entry" ) == 0 )
1056 on_end_entry( context, name );
1057 else if ( strcmp( name, "tractor" ) == 0 )
1058 on_end_tractor( context, name );
1059 else if ( strcmp( name, "property" ) == 0 )
1060 on_end_property( context, name );
1061 else if ( strcmp( name, "producer" ) == 0 || strcmp( name, "video" ) == 0 )
1062 on_end_producer( context, name );
1063 else if ( strcmp( name, "filter" ) == 0 )
1064 on_end_filter( context, name );
1065 else if ( strcmp( name, "transition" ) == 0 )
1066 on_end_transition( context, name );
1067
1068 context->branch[ context->depth ] = 0;
1069 context->depth --;
1070 }
1071
1072 static void on_characters( void *ctx, const xmlChar *ch, int len )
1073 {
1074 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1075 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1076 char *value = calloc( len + 1, 1 );
1077 enum service_type type;
1078 mlt_service service = context_pop_service( context, &type );
1079 mlt_properties properties = MLT_SERVICE_PROPERTIES( service );
1080
1081 if ( service != NULL )
1082 context_push_service( context, service, type );
1083
1084 value[ len ] = 0;
1085 strncpy( value, (const char*) ch, len );
1086
1087 if ( context->stack_node_size > 0 )
1088 xmlNodeAddContent( context->stack_node[ context->stack_node_size - 1 ], ( xmlChar* )value );
1089
1090 // libxml2 generates an on_characters immediately after a get_entity within
1091 // an element value, and we ignore it because it is called again during
1092 // actual substitution.
1093 else if ( context->property != NULL && context->entity_is_replace == 0 )
1094 {
1095 char *s = mlt_properties_get( properties, context->property );
1096 if ( s != NULL )
1097 {
1098 // Append new text to existing content
1099 char *new = calloc( strlen( s ) + len + 1, 1 );
1100 strcat( new, s );
1101 strcat( new, value );
1102 mlt_properties_set( properties, context->property, new );
1103 free( new );
1104 }
1105 else
1106 mlt_properties_set( properties, context->property, value );
1107 }
1108 context->entity_is_replace = 0;
1109
1110 free( value);
1111 }
1112
1113 /** Convert parameters parsed from resource into entity declarations.
1114 */
1115 static void params_to_entities( deserialise_context context )
1116 {
1117 if ( context->params != NULL )
1118 {
1119 int i;
1120
1121 // Add our params as entitiy declarations
1122 for ( i = 0; i < mlt_properties_count( context->params ); i++ )
1123 {
1124 xmlChar *name = ( xmlChar* )mlt_properties_get_name( context->params, i );
1125 xmlAddDocEntity( context->entity_doc, name, XML_INTERNAL_GENERAL_ENTITY,
1126 context->publicId, context->systemId, ( xmlChar* )mlt_properties_get( context->params, name ) );
1127 }
1128
1129 // Flag completion
1130 mlt_properties_close( context->params );
1131 context->params = NULL;
1132 }
1133 }
1134
1135 // The following 3 facilitate entity substitution in the SAX parser
1136 static void on_internal_subset( void *ctx, const xmlChar* name,
1137 const xmlChar* publicId, const xmlChar* systemId )
1138 {
1139 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1140 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1141
1142 context->publicId = publicId;
1143 context->systemId = systemId;
1144 xmlCreateIntSubset( context->entity_doc, name, publicId, systemId );
1145
1146 // Override default entities with our parameters
1147 params_to_entities( context );
1148 }
1149
1150 // TODO: Check this with Dan... I think this is for westley parameterisation
1151 // but it's breaking standard escaped entities (like &lt; etc).
1152 static void on_entity_declaration( void *ctx, const xmlChar* name, int type,
1153 const xmlChar* publicId, const xmlChar* systemId, xmlChar* content)
1154 {
1155 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1156 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1157
1158 xmlAddDocEntity( context->entity_doc, name, type, publicId, systemId, content );
1159 }
1160
1161 // TODO: Check this functionality (see on_entity_declaration)
1162 static xmlEntityPtr on_get_entity( void *ctx, const xmlChar* name )
1163 {
1164 struct _xmlParserCtxt *xmlcontext = ( struct _xmlParserCtxt* )ctx;
1165 deserialise_context context = ( deserialise_context )( xmlcontext->_private );
1166 xmlEntityPtr e = NULL;
1167
1168 // Setup for entity declarations if not ready
1169 if ( xmlGetIntSubset( context->entity_doc ) == NULL )
1170 {
1171 xmlCreateIntSubset( context->entity_doc, "westley", "", "" );
1172 context->publicId = "";
1173 context->systemId = "";
1174 }
1175
1176 // Add our parameters if not already
1177 params_to_entities( context );
1178
1179 e = xmlGetPredefinedEntity( name );
1180
1181 // Send signal to on_characters that an entity substitutin is pending
1182 if ( e == NULL )
1183 {
1184 e = xmlGetDocEntity( context->entity_doc, name );
1185 if ( e != NULL )
1186 context->entity_is_replace = 1;
1187 }
1188
1189 return e;
1190 }
1191
1192 /** Convert a hexadecimal character to its value.
1193 */
1194 static int tohex( char p )
1195 {
1196 return isdigit( p ) ? p - '0' : tolower( p ) - 'a' + 10;
1197 }
1198
1199 /** Decode a url-encoded string containing hexadecimal character sequences.
1200 */
1201 static char *url_decode( char *dest, char *src )
1202 {
1203 char *p = dest;
1204
1205 while ( *src )
1206 {
1207 if ( *src == '%' )
1208 {
1209 *p ++ = ( tohex( *( src + 1 ) ) << 4 ) | tohex( *( src + 2 ) );
1210 src += 3;
1211 }
1212 else
1213 {
1214 *p ++ = *src ++;
1215 }
1216 }
1217
1218 *p = *src;
1219 return dest;
1220 }
1221
1222 /** Extract the filename from a URL attaching parameters to a properties list.
1223 */
1224 static void parse_url( mlt_properties properties, char *url )
1225 {
1226 int i;
1227 int n = strlen( url );
1228 char *name = NULL;
1229 char *value = NULL;
1230
1231 for ( i = 0; i < n; i++ )
1232 {
1233 switch ( url[ i ] )
1234 {
1235 case '?':
1236 url[ i++ ] = '\0';
1237 name = &url[ i ];
1238 break;
1239
1240 case ':':
1241 case '=':
1242 url[ i++ ] = '\0';
1243 value = &url[ i ];
1244 break;
1245
1246 case '&':
1247 url[ i++ ] = '\0';
1248 if ( name != NULL && value != NULL )
1249 mlt_properties_set( properties, name, value );
1250 name = &url[ i ];
1251 value = NULL;
1252 break;
1253 }
1254 }
1255 if ( name != NULL && value != NULL )
1256 mlt_properties_set( properties, name, value );
1257 }
1258
1259 // Quick workaround to avoid unecessary libxml2 warnings
1260 static int file_exists( char *file )
1261 {
1262 char *name = strdup( file );
1263 int exists = 0;
1264 if ( name != NULL && strchr( name, '?' ) )
1265 *( strchr( name, '?' ) ) = '\0';
1266 if ( name != NULL )
1267 {
1268 FILE *f = fopen( name, "r" );
1269 exists = f != NULL;
1270 if ( exists ) fclose( f );
1271 }
1272 free( name );
1273 return exists;
1274 }
1275
1276 mlt_producer producer_westley_init( int info, char *data )
1277 {
1278 xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
1279 struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
1280 mlt_properties properties = NULL;
1281 int i = 0;
1282 struct _xmlParserCtxt *xmlcontext;
1283 int well_formed = 0;
1284 char *filename = NULL;
1285
1286 if ( data == NULL || !strcmp( data, "" ) || ( info == 0 && !file_exists( data ) ) )
1287 return NULL;
1288
1289 context = calloc( 1, sizeof( struct deserialise_context_s ) );
1290 if ( context == NULL )
1291 return NULL;
1292
1293 context->producer_map = mlt_properties_new();
1294 context->destructors = mlt_properties_new();
1295 context->params = mlt_properties_new();
1296
1297 // Decode URL and parse parameters
1298 mlt_properties_set( context->producer_map, "root", "" );
1299 if ( info == 0 )
1300 {
1301 filename = strdup( data );
1302 parse_url( context->params, url_decode( filename, data ) );
1303
1304 // We need the directory prefix which was used for the westley
1305 if ( strchr( filename, '/' ) )
1306 {
1307 char *root = NULL;
1308 mlt_properties_set( context->producer_map, "root", filename );
1309 root = mlt_properties_get( context->producer_map, "root" );
1310 *( strrchr( root, '/' ) ) = '\0';
1311
1312 // If we don't have an absolute path here, we're heading for disaster...
1313 if ( root[ 0 ] != '/' )
1314 {
1315 char *cwd = getcwd( NULL, 0 );
1316 char *real = malloc( strlen( cwd ) + strlen( root ) + 2 );
1317 sprintf( real, "%s/%s", cwd, root );
1318 mlt_properties_set( context->producer_map, "root", real );
1319 free( real );
1320 free( cwd );
1321 }
1322 }
1323 }
1324
1325 // We need to track the number of registered filters
1326 mlt_properties_set_int( context->destructors, "registered", 0 );
1327
1328 // Setup SAX callbacks
1329 sax->startElement = on_start_element;
1330 sax->endElement = on_end_element;
1331 sax->characters = on_characters;
1332 sax->cdataBlock = on_characters;
1333 sax->internalSubset = on_internal_subset;
1334 sax->entityDecl = on_entity_declaration;
1335 sax->getEntity = on_get_entity;
1336
1337 // Setup libxml2 SAX parsing
1338 xmlInitParser();
1339 xmlSubstituteEntitiesDefault( 1 );
1340 // This is used to facilitate entity substitution in the SAX parser
1341 context->entity_doc = xmlNewDoc( "1.0" );
1342 if ( info == 0 )
1343 xmlcontext = xmlCreateFileParserCtxt( filename );
1344 else
1345 xmlcontext = xmlCreateMemoryParserCtxt( data, strlen( data ) );
1346
1347 // Invalid context - clean up and return NULL
1348 if ( xmlcontext == NULL )
1349 {
1350 mlt_properties_close( context->producer_map );
1351 mlt_properties_close( context->destructors );
1352 mlt_properties_close( context->params );
1353 free( context );
1354 free( sax );
1355 free( filename );
1356 return NULL;
1357 }
1358
1359 xmlcontext->sax = sax;
1360 xmlcontext->_private = ( void* )context;
1361
1362 // Parse
1363 xmlParseDocument( xmlcontext );
1364 well_formed = xmlcontext->wellFormed;
1365
1366 // Cleanup after parsing
1367 xmlFreeDoc( context->entity_doc );
1368 free( sax );
1369 xmlcontext->sax = NULL;
1370 xmlcontext->_private = NULL;
1371 xmlFreeParserCtxt( xmlcontext );
1372 xmlMemoryDump( ); // for debugging
1373
1374 // Get the last producer on the stack
1375 enum service_type type;
1376 mlt_service service = context_pop_service( context, &type );
1377 if ( well_formed && service != NULL )
1378 {
1379 // Verify it is a producer service (mlt_type="mlt_producer")
1380 // (producer, playlist, multitrack)
1381 char *type = mlt_properties_get( MLT_SERVICE_PROPERTIES( service ), "mlt_type" );
1382 if ( type == NULL || ( strcmp( type, "mlt_producer" ) != 0 && strcmp( type, "producer" ) != 0 ) )
1383 service = NULL;
1384 }
1385
1386 #ifdef DEBUG
1387 xmlDocPtr doc = westley_make_doc( service );
1388 xmlDocFormatDump( stdout, doc, 1 );
1389 xmlFreeDoc( doc );
1390 service = NULL;
1391 #endif
1392
1393 if ( well_formed && service != NULL )
1394 {
1395 char *title = mlt_properties_get( context->producer_map, "title" );
1396
1397 // Need the complete producer list for various reasons
1398 properties = context->destructors;
1399
1400 // Now make sure we don't have a reference to the service in the properties
1401 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
1402 {
1403 char *name = mlt_properties_get_name( properties, i );
1404 if ( mlt_properties_get_data( properties, name, NULL ) == service )
1405 {
1406 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
1407 break;
1408 }
1409 }
1410
1411 // We are done referencing destructor property list
1412 // Set this var to service properties for convenience
1413 properties = MLT_SERVICE_PROPERTIES( service );
1414
1415 // Assign the title
1416 mlt_properties_set( properties, "title", title );
1417
1418 // Optimise for overlapping producers
1419 mlt_producer_optimise( MLT_PRODUCER( service ) );
1420
1421 // Handle deep copies
1422 if ( getenv( "MLT_WESTLEY_DEEP" ) == NULL )
1423 {
1424 // Now assign additional properties
1425 if ( info == 0 )
1426 mlt_properties_set( properties, "resource", data );
1427
1428 // This tells consumer_westley not to deep copy
1429 mlt_properties_set( properties, "westley", "was here" );
1430 }
1431 else
1432 {
1433 // Allow the project to be edited
1434 mlt_properties_set( properties, "_westley", "was here" );
1435 mlt_properties_set_int( properties, "_mlt_service_hidden", 1 );
1436 }
1437 }
1438 else
1439 {
1440 // Return null if not well formed
1441 service = NULL;
1442 }
1443
1444 // Clean up
1445 mlt_properties_close( context->producer_map );
1446 if ( context->params != NULL )
1447 mlt_properties_close( context->params );
1448 mlt_properties_close( context->destructors );
1449 free( context );
1450 free( filename );
1451
1452 return MLT_PRODUCER( service );
1453 }