research.m1stereo.tv/gitweb/ - melted/blob - 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 // TODO: try using XmlReader interface to avoid global context issues in sax.
  24
  25 #include "producer_westley.h"
  26 #include <framework/mlt.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30
  31 #include <libxml/parser.h>
  32
  33 #define STACK_SIZE 1000
  34
  35 struct deserialise_context_s
  36 {
  37         mlt_service stack_service[ STACK_SIZE ];
  38         int stack_service_size;
  39         mlt_properties producer_map;
  40         mlt_properties destructors;
  41         char *property;
  42         mlt_properties producer_properties;
  43 };
  44 typedef struct deserialise_context_s *deserialise_context;
  45
  46
  47 /** Push a service.
  48 */
  49
  50 static int context_push_service( deserialise_context this, mlt_service that )
  51 {
  52         int ret = this->stack_service_size >= STACK_SIZE;
  53         if ( ret == 0 )
  54                 this->stack_service[ this->stack_service_size ++ ] = that;
  55         return ret;
  56 }
  57
  58 /** Pop a service.
  59 */
  60
  61 static mlt_service context_pop_service( deserialise_context this )
  62 {
  63         mlt_service result = NULL;
  64         if ( this->stack_service_size > 0 )
  65                 result = this->stack_service[ -- this->stack_service_size ];
  66         return result;
  67 }
  68
  69 // Set the destructor on a new service
  70 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
  71 {
  72         int registered = mlt_properties_get_int( properties, "registered" );
  73         char *key = mlt_properties_get( properties, "registered" );
  74         mlt_properties_set_data( properties, key, service, 0, destructor, NULL );
  75         mlt_properties_set_int( properties, "registered", ++ registered );
  76 }
  77
  78 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
  79 {
  80         mlt_service service = mlt_tractor_service( mlt_tractor_init() );
  81         mlt_properties properties = mlt_service_properties( service );
  82
  83         track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
  84
  85         mlt_properties_set_position( properties, "length", 0 );
  86
  87         for ( ; atts != NULL && *atts != NULL; atts += 2 )
  88                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
  89
  90         if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
  91         {
  92                 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
  93                 mlt_properties_set_position( properties, "length", length );
  94         }
  95
  96         context_push_service( context, service );
  97 }
  98
  99 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 100 {
 101         mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
 102         mlt_properties properties = mlt_service_properties( service );
 103
 104         track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
 105
 106         mlt_properties_set_position( properties, "length", 0 );
 107
 108         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 109                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 110
 111         context_push_service( context, service );
 112 }
 113
 114 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 115 {
 116         mlt_service service = mlt_playlist_service( mlt_playlist_init() );
 117         mlt_properties properties = mlt_service_properties( service );
 118
 119         track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
 120
 121         mlt_properties_set_position( properties, "length", 0 );
 122
 123         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 124         {
 125                 mlt_properties_set( properties, ( char* )atts[0], ( char* )atts[1] );
 126
 127                 // Out will be overwritten later as we append, so we need to save it
 128                 if ( strcmp( atts[ 0 ], "out" ) == 0 )
 129                         mlt_properties_set( properties, "_westley.out", ( char* )atts[ 1 ] );
 130         }
 131
 132         if ( mlt_properties_get( properties, "id" ) != NULL )
 133                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 134
 135         context_push_service( context, service );
 136 }
 137
 138 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 139 {
 140         mlt_properties properties = context->producer_properties = mlt_properties_new();
 141
 142         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 143         {
 144                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 145         }
 146 }
 147
 148 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 149 {
 150         // Get the playlist from the stack
 151         mlt_service service = context_pop_service( context );
 152         mlt_position length = 0;
 153
 154         // Look for the length attribute
 155         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 156         {
 157                 if ( strcmp( atts[0], "length" ) == 0 )
 158                 {
 159                         length = atoll( atts[1] );
 160                         break;
 161                 }
 162         }
 163
 164         // Append a blank to the playlist
 165         mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
 166
 167         // Push the playlist back onto the stack
 168         context_push_service( context, service );
 169 }
 170
 171 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 172 {
 173         // Use a dummy service to hold properties to allow arbitratry nesting
 174         mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
 175         mlt_service_init( service, NULL );
 176
 177         // Push the dummy service onto the stack
 178         context_push_service( context, service );
 179
 180         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 181         {
 182                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
 183
 184                 // Look for the producer attribute
 185                 if ( strcmp( atts[ 0 ], "producer" ) == 0 )
 186                 {
 187                         if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) !=  NULL )
 188                                 // Push the referenced producer onto the stack
 189                                 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
 190                 }
 191         }
 192 }
 193
 194 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 195 {
 196         mlt_properties properties = context->producer_properties = mlt_properties_new();
 197
 198         // Set the properties
 199         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 200                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 201 }
 202
 203 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 204 {
 205         mlt_properties properties = context->producer_properties = mlt_properties_new();
 206
 207         // Set the properties
 208         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 209                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 210 }
 211
 212 static void on_start_property( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 213 {
 214         mlt_properties properties = context->producer_properties;
 215         char *value = NULL;
 216
 217         if ( properties == NULL )
 218                 return;
 219
 220         // Set the properties
 221         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 222         {
 223                 if ( strcmp( atts[ 0 ], "name" ) == 0 )
 224                 {
 225                         context->property = strdup( atts[ 1 ] );
 226                 }
 227                 else if ( strcmp( atts[ 0 ], "value" ) == 0 )
 228                 {
 229                         value = (char*) atts[ 1 ];
 230                 }
 231         }
 232
 233         if ( context->property != NULL && value != NULL )
 234                 mlt_properties_set( properties, context->property, value );
 235 }
 236
 237 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
 238 {
 239         // Get the producer (multitrack) from the stack
 240         mlt_service producer = context_pop_service( context );
 241
 242         // Get the tractor from the stack
 243         mlt_service service = context_pop_service( context );
 244
 245         // Connect the tractor to the producer
 246         mlt_tractor_connect( MLT_TRACTOR( service ), producer );
 247         mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
 248                 MLT_MULTITRACK( producer ), 0, NULL, NULL );
 249
 250         // Push the tractor back onto the stack
 251         context_push_service( context, service );
 252
 253         // Push the producer back onto the stack
 254         context_push_service( context, producer );
 255 }
 256
 257 static void on_end_playlist( deserialise_context context, const xmlChar *name )
 258 {
 259         // Get the playlist from the stack
 260         mlt_service service = context_pop_service( context );
 261         mlt_properties properties = mlt_service_properties( service );
 262
 263         mlt_position in = mlt_properties_get_position( properties, "in" );
 264         mlt_position out;
 265
 266         if ( mlt_properties_get( properties, "_westley.out" ) != NULL )
 267                 out = mlt_properties_get_position( properties, "_westley.out" );
 268         else
 269                 out = mlt_properties_get_position( properties, "length" ) - 1;
 270
 271         if ( mlt_properties_get_position( properties, "length" ) < out )
 272                 mlt_properties_set_position( properties, "length", out  + 1 );
 273
 274         mlt_producer_set_in_and_out( MLT_PRODUCER( service ), in, out );
 275
 276         // Push the playlist back onto the stack
 277         context_push_service( context, service );
 278 }
 279
 280 static void on_end_track( deserialise_context context, const xmlChar *name )
 281 {
 282         // Get the producer from the stack
 283         mlt_service producer = context_pop_service( context );
 284
 285         // Get the dummy track service from the stack
 286         mlt_service track = context_pop_service( context );
 287
 288         // Get the multitrack from the stack
 289         mlt_service service = context_pop_service( context );
 290
 291         // Set the track on the multitrack
 292         mlt_multitrack_connect( MLT_MULTITRACK( service ),
 293                 MLT_PRODUCER( producer ),
 294                 mlt_multitrack_count( MLT_MULTITRACK( service ) ) );
 295
 296         // Set producer i/o if specified
 297         if ( mlt_properties_get( mlt_service_properties( track ), "in" ) != NULL ||
 298                 mlt_properties_get( mlt_service_properties( track ), "out" ) != NULL )
 299         {
 300                 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ),
 301                         mlt_properties_get_position( mlt_service_properties( track ), "in" ),
 302                         mlt_properties_get_position( mlt_service_properties( track ), "out" ) );
 303         }
 304
 305         // Push the multitrack back onto the stack
 306         context_push_service( context, service );
 307
 308         mlt_service_close( track );
 309 }
 310
 311 static void on_end_entry( deserialise_context context, const xmlChar *name )
 312 {
 313         // Get the producer from the stack
 314         mlt_service producer = context_pop_service( context );
 315
 316         // Get the dummy entry service from the stack
 317         mlt_service entry = context_pop_service( context );
 318
 319         // Get the playlist from the stack
 320         mlt_service service = context_pop_service( context );
 321
 322         // Append the producer to the playlist
 323         if ( mlt_properties_get( mlt_service_properties( entry ), "in" ) != NULL ||
 324                 mlt_properties_get( mlt_service_properties( entry ), "out" ) != NULL )
 325         {
 326                 mlt_playlist_append_io( MLT_PLAYLIST( service ),
 327                         MLT_PRODUCER( producer ),
 328                         mlt_properties_get_position( mlt_service_properties( entry ), "in" ),
 329                         mlt_properties_get_position( mlt_service_properties( entry ), "out" ) );
 330         }
 331         else
 332         {
 333                 mlt_playlist_append( MLT_PLAYLIST( service ), MLT_PRODUCER( producer ) );
 334         }
 335
 336         // Push the playlist back onto the stack
 337         context_push_service( context, service );
 338
 339         mlt_service_close( entry );
 340 }
 341
 342 static void on_end_tractor( deserialise_context context, const xmlChar *name )
 343 {
 344         // Get and discard the last producer
 345         mlt_producer multitrack = MLT_PRODUCER( context_pop_service( context ) );
 346
 347         // Get the tractor
 348         mlt_service tractor = context_pop_service( context );
 349         multitrack = mlt_properties_get_data( mlt_service_properties( tractor ), "multitrack", NULL );
 350
 351         // Inherit the producer's properties
 352         mlt_properties properties = mlt_producer_properties( multitrack );
 353         mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
 354         mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
 355         mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
 356
 357         // Push the playlist back onto the stack
 358         context_push_service( context, tractor );
 359 }
 360
 361 static void on_end_property( deserialise_context context, const xmlChar *name )
 362 {
 363         // Close this property handling
 364         free( context->property );
 365         context->property = NULL;
 366 }
 367
 368 static void on_end_producer( deserialise_context context, const xmlChar *name )
 369 {
 370         mlt_properties properties = context->producer_properties;
 371         mlt_service service = NULL;
 372
 373         if ( properties == NULL )
 374                 return;
 375
 376         // Instantiate the producer
 377         if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
 378         {
 379                 service = MLT_SERVICE( mlt_factory_producer( "fezzik", mlt_properties_get( properties, "mlt_service" ) ) );
 380         }
 381         if ( service == NULL && mlt_properties_get( properties, "resource" ) != NULL )
 382         {
 383                 char *root = mlt_properties_get( context->producer_map, "_root" );
 384                 char *resource = mlt_properties_get( properties, "resource" );
 385                 char *full_resource = malloc( strlen( root ) + strlen( resource ) + 1 );
 386                 if ( resource[ 0 ] != '/' )
 387                 {
 388                         strcpy( full_resource, root );
 389                         strcat( full_resource, resource );
 390                 }
 391                 else
 392                 {
 393                         strcpy( full_resource, resource );
 394                 }
 395                 service = MLT_SERVICE( mlt_factory_producer( "fezzik", full_resource ) );
 396                 free( full_resource );
 397         }
 398
 399         track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
 400
 401         // Add the producer to the producer map
 402         if ( mlt_properties_get( properties, "id" ) != NULL )
 403                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 404
 405         mlt_properties_inherit( mlt_service_properties( service ), properties );
 406         mlt_properties_close( properties );
 407         context->producer_properties = NULL;
 408         properties = mlt_service_properties( service );
 409
 410         // Set in and out
 411         mlt_producer_set_in_and_out( MLT_PRODUCER( service ),
 412                 mlt_properties_get_position( properties, "in" ),
 413                 mlt_properties_get_position( properties, "out" ) );
 414
 415         // Push the new producer onto the stack
 416         context_push_service( context, service );
 417 }
 418
 419 static void on_end_filter( deserialise_context context, const xmlChar *name )
 420 {
 421         mlt_properties properties = context->producer_properties;
 422         if ( properties == NULL )
 423                 return;
 424
 425         char *id;
 426         char key[11];
 427         key[ 10 ] = '\0';
 428
 429         // Get the producer from the stack
 430         mlt_service producer = context_pop_service( context );
 431 //fprintf( stderr, "connecting filter to %s\n", mlt_properties_get( mlt_service_properties( producer ), "resource" ) );
 432
 433         // Create the filter
 434         mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 435
 436         track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
 437
 438         // Connect the filter to the producer
 439         mlt_filter_connect( MLT_FILTER( service ), producer,
 440                 mlt_properties_get_int( properties, "track" ) );
 441
 442         // Set in and out from producer if non existant
 443         if ( mlt_properties_get( properties, "in" ) == NULL )
 444                 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
 445         if ( mlt_properties_get( properties, "out" ) == NULL )
 446                 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
 447
 448         // Propogate the properties
 449         mlt_properties_inherit( mlt_service_properties( service ), properties );
 450         mlt_properties_close( properties );
 451         context->producer_properties = NULL;
 452         properties = mlt_service_properties( service );
 453
 454         // Set in and out
 455 //fprintf( stderr, "setting filter in %lld out %lld\n", mlt_properties_get_position( properties, "in" ), mlt_properties_get_position( properties, "out" ) );
 456         mlt_filter_set_in_and_out( MLT_FILTER( service ),
 457                 mlt_properties_get_position( properties, "in" ),
 458                 mlt_properties_get_position( properties, "out" ) );
 459
 460         // Get the parent producer from the stack
 461         mlt_service tractor = context_pop_service( context );
 462
 463         if ( tractor != NULL )
 464         {
 465 //fprintf( stderr, "connecting tractor %s to filter\n", mlt_properties_get( mlt_service_properties( tractor ), "resource" ) );
 466                 // Connect the tractor to the filter
 467                 if ( strcmp( mlt_properties_get( mlt_service_properties( tractor ), "resource" ), "<tractor>" ) == 0 )
 468                         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 469
 470                 // Push the parent producer back onto the stack
 471                 context_push_service( context, tractor );
 472         }
 473
 474 //fprintf( stderr, "setting filter in %lld out %lld\n", mlt_properties_get_position( properties, "in" ), mlt_properties_get_position( properties, "out" ) );
 475         // If a producer alias is in the producer_map, get it
 476         snprintf( key, 10, "%p", producer );
 477         if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
 478                 producer = mlt_properties_get_data( context->producer_map, key, NULL );
 479
 480         // Put the producer in the producer map
 481         id = mlt_properties_get( mlt_service_properties( producer ), "id" );
 482         if ( id != NULL )
 483                 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
 484
 485         // For filter chain support, add an alias to the producer map
 486         snprintf( key, 10, "%p", service );
 487         mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
 488
 489         // Push the filter onto the stack
 490         context_push_service( context, service );
 491
 492 }
 493
 494 static void on_end_transition( deserialise_context context, const xmlChar *name )
 495 {
 496         mlt_properties properties = context->producer_properties;
 497         if ( properties == NULL )
 498                 return;
 499
 500         // Get the producer from the stack
 501         mlt_service producer = context_pop_service( context );
 502
 503         // Create the transition
 504         mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 505
 506         track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
 507
 508         // Propogate the properties
 509         mlt_properties_inherit( mlt_service_properties( service ), properties );
 510         mlt_properties_close( properties );
 511         context->producer_properties = NULL;
 512         properties = mlt_service_properties( service );
 513
 514         // Set in and out
 515         mlt_transition_set_in_and_out( MLT_TRANSITION( service ),
 516                 mlt_properties_get_position( properties, "in" ),
 517                 mlt_properties_get_position( properties, "out" ) );
 518
 519         // Connect the filter to the producer
 520         mlt_transition_connect( MLT_TRANSITION( service ), producer,
 521                 mlt_properties_get_int( properties, "a_track" ),
 522                 mlt_properties_get_int( properties, "b_track" ) );
 523
 524         // Get the tractor from the stack
 525         mlt_service tractor = context_pop_service( context );
 526
 527         // Connect the tractor to the transition
 528         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 529
 530         // Push the tractor back onto the stack
 531         context_push_service( context, tractor );
 532
 533         // Push the transition onto the stack
 534         context_push_service( context, service );
 535 }
 536
 537 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
 538 {
 539         deserialise_context context = ( deserialise_context ) ctx;
 540
 541         if ( strcmp( name, "tractor" ) == 0 )
 542                 on_start_tractor( context, name, atts );
 543         else if ( strcmp( name, "multitrack" ) == 0 )
 544                 on_start_multitrack( context, name, atts );
 545         else if ( strcmp( name, "playlist" ) == 0 )
 546                 on_start_playlist( context, name, atts );
 547         else if ( strcmp( name, "producer" ) == 0 )
 548                 on_start_producer( context, name, atts );
 549         else if ( strcmp( name, "blank" ) == 0 )
 550                 on_start_blank( context, name, atts );
 551         else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
 552                 on_start_entry_track( context, name, atts );
 553         else if ( strcmp( name, "filter" ) == 0 )
 554                 on_start_filter( context, name, atts );
 555         else if ( strcmp( name, "transition" ) == 0 )
 556                 on_start_transition( context, name, atts );
 557         else if ( strcmp( name, "property" ) == 0 )
 558                 on_start_property( context, name, atts );
 559 }
 560
 561 static void on_end_element( void *ctx, const xmlChar *name )
 562 {
 563         deserialise_context context = ( deserialise_context ) ctx;
 564
 565         if ( strcmp( name, "multitrack" ) == 0 )
 566                 on_end_multitrack( context, name );
 567         else if ( strcmp( name, "playlist" ) == 0 )
 568                 on_end_playlist( context, name );
 569         else if ( strcmp( name, "track" ) == 0 )
 570                 on_end_track( context, name );
 571         else if ( strcmp( name, "entry" ) == 0 )
 572                 on_end_entry( context, name );
 573         else if ( strcmp( name, "tractor" ) == 0 )
 574                 on_end_tractor( context, name );
 575         else if ( strcmp( name, "property" ) == 0 )
 576                 on_end_property( context, name );
 577         else if ( strcmp( name, "producer" ) == 0 )
 578                 on_end_producer( context, name );
 579         else if ( strcmp( name, "filter" ) == 0 )
 580                 on_end_filter( context, name );
 581         else if ( strcmp( name, "transition" ) == 0 )
 582                 on_end_transition( context, name );
 583 }
 584
 585 static void on_characters( void *ctx, const xmlChar *ch, int len )
 586 {
 587         deserialise_context context = ( deserialise_context ) ctx;
 588         char *value = calloc( len + 1, 1 );
 589
 590         value[ len ] = 0;
 591         strncpy( value, (const char*) ch, len );
 592
 593         if ( context->property != NULL && context->producer_properties != NULL )
 594                 mlt_properties_set( context->producer_properties, context->property, value );
 595
 596         free( value);
 597 }
 598
 599 mlt_producer producer_westley_init( char *filename )
 600 {
 601         xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
 602         struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
 603         mlt_properties properties = NULL;
 604         int i = 0;
 605
 606         context->producer_map = mlt_properties_new();
 607         context->destructors = mlt_properties_new();
 608
 609         // We need to track the number of registered filters
 610         mlt_properties_set_int( context->destructors, "registered", 0 );
 611
 612         // We need the directory prefix which was used for the westley
 613         mlt_properties_set( context->producer_map, "_root", "" );
 614         if ( strchr( filename, '/' ) )
 615         {
 616                 char *root = NULL;
 617                 mlt_properties_set( context->producer_map, "_root", filename );
 618                 root = mlt_properties_get( context->producer_map, "_root" );
 619                 *( strrchr( root, '/' ) + 1 ) = '\0';
 620         }
 621
 622         sax->startElement = on_start_element;
 623         sax->endElement = on_end_element;
 624         sax->characters = on_characters;
 625         sax->cdataBlock = on_characters;
 626
 627         // I REALLY DON'T GET THIS - HOW THE HELL CAN YOU REFERENCE A WESTLEY IN A WESTLEY???
 628         xmlInitParser();
 629
 630         xmlSAXUserParseFile( sax, context, filename );
 631
 632         // Need the complete producer list for various reasons
 633         properties = context->destructors;
 634
 635         // Get the last producer on the stack
 636         mlt_service service = context_pop_service( context );
 637
 638         // Do we actually have a producer here?
 639         if ( service != NULL )
 640         {
 641                 // Now make sure we don't have a reference to the service in the properties
 642                 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
 643                 {
 644                         char *name = mlt_properties_get_name( properties, i );
 645                         if ( mlt_properties_get_data( properties, name, NULL ) == service )
 646                         {
 647                                 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
 648                                 break;
 649                         }
 650                 }
 651
 652                 // We are done referencing destructor property list
 653                 // Set this var to service properties for convenience
 654                 properties = mlt_service_properties( service );
 655
 656                 // make the returned service destroy the connected services
 657                 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
 658
 659                 // Now assign additional properties
 660                 mlt_properties_set( properties, "resource", filename );
 661
 662                 // This tells consumer_westley not to deep copy
 663                 mlt_properties_set( properties, "westley", "was here" );
 664         }
 665         else
 666         {
 667                 // Clean up
 668                 mlt_properties_close( properties );
 669         }
 670
 671         free( context->stack_service );
 672         mlt_properties_close( context->producer_map );
 673         //free( context );
 674         free( sax );
 675         //xmlCleanupParser();
 676         xmlMemoryDump( );
 677
 678
 679         return MLT_PRODUCER( service );
 680 }