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
  22
  23 #include "producer_westley.h"
  24 #include <framework/mlt.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28
  29 #include <libxml/parser.h>
  30
  31 #define STACK_SIZE 1000
  32
  33 struct deserialise_context_s
  34 {
  35         mlt_service stack_service[ STACK_SIZE ];
  36         int stack_service_size;
  37         mlt_properties producer_map;
  38         mlt_properties destructors;
  39         char *property;
  40         mlt_properties producer_properties;
  41 };
  42 typedef struct deserialise_context_s *deserialise_context;
  43
  44
  45 /** Push a service.
  46 */
  47
  48 static int context_push_service( deserialise_context this, mlt_service that )
  49 {
  50         int ret = this->stack_service_size >= STACK_SIZE;
  51         if ( ret == 0 )
  52                 this->stack_service[ this->stack_service_size ++ ] = that;
  53         return ret;
  54 }
  55
  56 /** Pop a service.
  57 */
  58
  59 static mlt_service context_pop_service( deserialise_context this )
  60 {
  61         mlt_service result = NULL;
  62         if ( this->stack_service_size > 0 )
  63                 result = this->stack_service[ -- this->stack_service_size ];
  64         return result;
  65 }
  66
  67 // Set the destructor on a new service
  68 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
  69 {
  70         int registered = mlt_properties_get_int( properties, "registered" );
  71         char *key = mlt_properties_get( properties, "registered" );
  72         mlt_properties_set_data( properties, key, service, 0, destructor, NULL );
  73         mlt_properties_set_int( properties, "registered", ++ registered );
  74 }
  75
  76 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
  77 {
  78         mlt_service service = mlt_tractor_service( mlt_tractor_init() );
  79         mlt_properties properties = mlt_service_properties( service );
  80
  81         track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
  82
  83         mlt_properties_set_position( properties, "length", 0 );
  84
  85         for ( ; atts != NULL && *atts != NULL; atts += 2 )
  86                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
  87
  88         if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
  89         {
  90                 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
  91                 mlt_properties_set_position( properties, "length", length );
  92         }
  93
  94         context_push_service( context, service );
  95 }
  96
  97 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
  98 {
  99         mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
 100         mlt_properties properties = mlt_service_properties( service );
 101
 102         track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
 103
 104         mlt_properties_set_position( properties, "length", 0 );
 105
 106         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 107                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 108
 109         context_push_service( context, service );
 110 }
 111
 112 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 113 {
 114         mlt_service service = mlt_playlist_service( mlt_playlist_init() );
 115         mlt_properties properties = mlt_service_properties( service );
 116
 117         track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
 118
 119         mlt_properties_set_position( properties, "length", 0 );
 120
 121         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 122         {
 123                 mlt_properties_set( properties, ( char* )atts[0], ( char* )atts[1] );
 124
 125                 // Out will be overwritten later as we append, so we need to save it
 126                 if ( strcmp( atts[ 0 ], "out" ) == 0 )
 127                         mlt_properties_set( properties, "_westley.out", ( char* )atts[ 1 ] );
 128         }
 129
 130         if ( mlt_properties_get( properties, "id" ) != NULL )
 131                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 132
 133         context_push_service( context, service );
 134 }
 135
 136 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 137 {
 138         mlt_properties properties = context->producer_properties = mlt_properties_new();
 139
 140         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 141         {
 142                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 143         }
 144 }
 145
 146 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 147 {
 148         // Get the playlist from the stack
 149         mlt_service service = context_pop_service( context );
 150         mlt_position length = 0;
 151
 152         // Look for the length attribute
 153         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 154         {
 155                 if ( strcmp( atts[0], "length" ) == 0 )
 156                 {
 157                         length = atoll( atts[1] );
 158                         break;
 159                 }
 160         }
 161
 162         // Append a blank to the playlist
 163         mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
 164
 165         // Push the playlist back onto the stack
 166         context_push_service( context, service );
 167 }
 168
 169 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 170 {
 171         // Use a dummy service to hold properties to allow arbitratry nesting
 172         mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
 173         mlt_service_init( service, NULL );
 174
 175         // Push the dummy service onto the stack
 176         context_push_service( context, service );
 177
 178         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 179         {
 180                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
 181
 182                 // Look for the producer attribute
 183                 if ( strcmp( atts[ 0 ], "producer" ) == 0 )
 184                 {
 185                         if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) !=  NULL )
 186                                 // Push the referenced producer onto the stack
 187                                 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
 188                 }
 189         }
 190 }
 191
 192 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 193 {
 194         mlt_properties properties = context->producer_properties = mlt_properties_new();
 195
 196         // Set the properties
 197         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 198                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 199 }
 200
 201 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 202 {
 203         mlt_properties properties = context->producer_properties = mlt_properties_new();
 204
 205         // Set the properties
 206         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 207                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 208 }
 209
 210 static void on_start_property( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 211 {
 212         mlt_properties properties = context->producer_properties;
 213         char *value = NULL;
 214
 215         if ( properties == NULL )
 216                 return;
 217
 218         // Set the properties
 219         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 220         {
 221                 if ( strcmp( atts[ 0 ], "name" ) == 0 )
 222                 {
 223                         context->property = strdup( atts[ 1 ] );
 224                 }
 225                 else if ( strcmp( atts[ 0 ], "value" ) == 0 )
 226                 {
 227                         value = (char*) atts[ 1 ];
 228                 }
 229         }
 230
 231         if ( context->property != NULL && value != NULL )
 232                 mlt_properties_set( properties, context->property, value );
 233 }
 234
 235 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
 236 {
 237         // Get the producer (multitrack) from the stack
 238         mlt_service producer = context_pop_service( context );
 239
 240         // Get the tractor from the stack
 241         mlt_service service = context_pop_service( context );
 242
 243         // Connect the tractor to the producer
 244         mlt_tractor_connect( MLT_TRACTOR( service ), producer );
 245         mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
 246                 MLT_MULTITRACK( producer ), 0, NULL, NULL );
 247
 248         // Push the tractor back onto the stack
 249         context_push_service( context, service );
 250
 251         // Push the producer back onto the stack
 252         context_push_service( context, producer );
 253 }
 254
 255 static void on_end_playlist( deserialise_context context, const xmlChar *name )
 256 {
 257         // Get the playlist from the stack
 258         mlt_service service = context_pop_service( context );
 259         mlt_properties properties = mlt_service_properties( service );
 260
 261         mlt_position in = mlt_properties_get_position( properties, "in" );
 262         mlt_position out;
 263
 264         if ( mlt_properties_get( properties, "_westley.out" ) != NULL )
 265                 out = mlt_properties_get_position( properties, "_westley.out" );
 266         else
 267                 out = mlt_properties_get_position( properties, "length" ) - 1;
 268
 269         if ( mlt_properties_get_position( properties, "length" ) < out )
 270                 mlt_properties_set_position( properties, "length", out  + 1 );
 271
 272         mlt_producer_set_in_and_out( MLT_PRODUCER( service ), in, out );
 273
 274         // Push the playlist back onto the stack
 275         context_push_service( context, service );
 276 }
 277
 278 static void on_end_track( deserialise_context context, const xmlChar *name )
 279 {
 280         // Get the producer from the stack
 281         mlt_service producer = context_pop_service( context );
 282
 283         // Get the dummy track service from the stack
 284         mlt_service track = context_pop_service( context );
 285
 286         // Get the multitrack from the stack
 287         mlt_service service = context_pop_service( context );
 288
 289         // Set the track on the multitrack
 290         mlt_multitrack_connect( MLT_MULTITRACK( service ),
 291                 MLT_PRODUCER( producer ),
 292                 mlt_multitrack_count( MLT_MULTITRACK( service ) ) );
 293
 294         // Set producer i/o if specified
 295         if ( mlt_properties_get( mlt_service_properties( track ), "in" ) != NULL ||
 296                 mlt_properties_get( mlt_service_properties( track ), "out" ) != NULL )
 297         {
 298                 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ),
 299                         mlt_properties_get_position( mlt_service_properties( track ), "in" ),
 300                         mlt_properties_get_position( mlt_service_properties( track ), "out" ) );
 301         }
 302
 303         // Push the multitrack back onto the stack
 304         context_push_service( context, service );
 305
 306         mlt_service_close( track );
 307 }
 308
 309 static void on_end_entry( deserialise_context context, const xmlChar *name )
 310 {
 311         // Get the producer from the stack
 312         mlt_service producer = context_pop_service( context );
 313
 314         // Get the dummy entry service from the stack
 315         mlt_service entry = context_pop_service( context );
 316
 317         // Get the playlist from the stack
 318         mlt_service service = context_pop_service( context );
 319
 320         // Append the producer to the playlist
 321         if ( mlt_properties_get( mlt_service_properties( entry ), "in" ) != NULL ||
 322                 mlt_properties_get( mlt_service_properties( entry ), "out" ) != NULL )
 323         {
 324                 mlt_playlist_append_io( MLT_PLAYLIST( service ),
 325                         MLT_PRODUCER( producer ),
 326                         mlt_properties_get_position( mlt_service_properties( entry ), "in" ),
 327                         mlt_properties_get_position( mlt_service_properties( entry ), "out" ) );
 328         }
 329         else
 330         {
 331                 mlt_playlist_append( MLT_PLAYLIST( service ), MLT_PRODUCER( producer ) );
 332         }
 333
 334         // Push the playlist back onto the stack
 335         context_push_service( context, service );
 336
 337         mlt_service_close( entry );
 338 }
 339
 340 static void on_end_tractor( deserialise_context context, const xmlChar *name )
 341 {
 342         // Get and discard the last producer
 343         mlt_producer multitrack = MLT_PRODUCER( context_pop_service( context ) );
 344
 345         // Get the tractor
 346         mlt_service tractor = context_pop_service( context );
 347         multitrack = mlt_properties_get_data( mlt_service_properties( tractor ), "multitrack", NULL );
 348
 349         // Inherit the producer's properties
 350         mlt_properties properties = mlt_producer_properties( multitrack );
 351         mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
 352         mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
 353         mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
 354
 355         // Push the playlist back onto the stack
 356         context_push_service( context, tractor );
 357 }
 358
 359 static void on_end_property( deserialise_context context, const xmlChar *name )
 360 {
 361         // Close this property handling
 362         free( context->property );
 363         context->property = NULL;
 364 }
 365
 366 static void on_end_producer( deserialise_context context, const xmlChar *name )
 367 {
 368         mlt_properties properties = context->producer_properties;
 369         mlt_service service = NULL;
 370
 371         if ( properties == NULL )
 372                 return;
 373
 374         // Instatiate the producer
 375         if ( mlt_properties_get( properties, "resource" ) != NULL )
 376         {
 377                 char *root = mlt_properties_get( context->producer_map, "_root" );
 378                 char *resource = mlt_properties_get( properties, "resource" );
 379                 char *full_resource = malloc( strlen( root ) + strlen( resource ) + 1 );
 380                 if ( resource[ 0 ] != '/' )
 381                 {
 382                         strcpy( full_resource, root );
 383                         strcat( full_resource, resource );
 384                 }
 385                 else
 386                 {
 387                         strcpy( full_resource, resource );
 388                 }
 389                 service = MLT_SERVICE( mlt_factory_producer( "fezzik", full_resource ) );
 390                 free( full_resource );
 391         }
 392         if ( service == NULL && mlt_properties_get( properties, "mlt_service" ) != NULL )
 393         {
 394                 service = MLT_SERVICE( mlt_factory_producer( "fezzik", mlt_properties_get( properties, "mlt_service" ) ) );
 395         }
 396
 397         track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
 398
 399         // Add the producer to the producer map
 400         if ( mlt_properties_get( properties, "id" ) != NULL )
 401                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 402
 403         mlt_properties_inherit( mlt_service_properties( service ), properties );
 404         mlt_properties_close( properties );
 405         context->producer_properties = NULL;
 406         properties = mlt_service_properties( service );
 407
 408         // Set in and out
 409         mlt_producer_set_in_and_out( MLT_PRODUCER( service ),
 410                 mlt_properties_get_position( properties, "in" ),
 411                 mlt_properties_get_position( properties, "out" ) );
 412
 413         // Push the new producer onto the stack
 414         context_push_service( context, service );
 415 }
 416
 417 static void on_end_filter( deserialise_context context, const xmlChar *name )
 418 {
 419         mlt_properties properties = context->producer_properties;
 420         if ( properties == NULL )
 421                 return;
 422
 423         char *id;
 424         char key[11];
 425         key[ 10 ] = '\0';
 426
 427         // Get the producer from the stack
 428         mlt_service producer = context_pop_service( context );
 429 //fprintf( stderr, "connecting filter to %s\n", mlt_properties_get( mlt_service_properties( producer ), "resource" ) );
 430
 431         // Create the filter
 432         mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 433
 434         track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
 435
 436         // Connect the filter to the producer
 437         mlt_filter_connect( MLT_FILTER( service ), producer,
 438                 mlt_properties_get_int( properties, "track" ) );
 439
 440         // Set in and out from producer if non existant
 441         if ( mlt_properties_get( properties, "in" ) == NULL )
 442                 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
 443         if ( mlt_properties_get( properties, "out" ) == NULL )
 444                 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
 445
 446         // Propogate the properties
 447         mlt_properties_inherit( mlt_service_properties( service ), properties );
 448         mlt_properties_close( properties );
 449         context->producer_properties = NULL;
 450         properties = mlt_service_properties( service );
 451
 452         // Set in and out
 453 //fprintf( stderr, "setting filter in %lld out %lld\n", mlt_properties_get_position( properties, "in" ), mlt_properties_get_position( properties, "out" ) );
 454         mlt_filter_set_in_and_out( MLT_FILTER( service ),
 455                 mlt_properties_get_position( properties, "in" ),
 456                 mlt_properties_get_position( properties, "out" ) );
 457
 458         // Get the parent producer from the stack
 459         mlt_service tractor = context_pop_service( context );
 460
 461         if ( tractor != NULL )
 462         {
 463 //fprintf( stderr, "connecting tractor %s to filter\n", mlt_properties_get( mlt_service_properties( tractor ), "resource" ) );
 464                 // Connect the tractor to the filter
 465                 if ( strcmp( mlt_properties_get( mlt_service_properties( tractor ), "resource" ), "<tractor>" ) == 0 )
 466                         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 467
 468                 // Push the parent producer back onto the stack
 469                 context_push_service( context, tractor );
 470         }
 471
 472 //fprintf( stderr, "setting filter in %lld out %lld\n", mlt_properties_get_position( properties, "in" ), mlt_properties_get_position( properties, "out" ) );
 473         // If a producer alias is in the producer_map, get it
 474         snprintf( key, 10, "%p", producer );
 475         if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
 476                 producer = mlt_properties_get_data( context->producer_map, key, NULL );
 477
 478         // Put the producer in the producer map
 479         id = mlt_properties_get( mlt_service_properties( producer ), "id" );
 480         if ( id != NULL )
 481                 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
 482
 483         // For filter chain support, add an alias to the producer map
 484         snprintf( key, 10, "%p", service );
 485         mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
 486
 487         // Push the filter onto the stack
 488         context_push_service( context, service );
 489
 490 }
 491
 492 static void on_end_transition( deserialise_context context, const xmlChar *name )
 493 {
 494         mlt_properties properties = context->producer_properties;
 495         if ( properties == NULL )
 496                 return;
 497
 498         // Get the producer from the stack
 499         mlt_service producer = context_pop_service( context );
 500
 501         // Create the transition
 502         mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 503
 504         track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
 505
 506         // Propogate the properties
 507         mlt_properties_inherit( mlt_service_properties( service ), properties );
 508         mlt_properties_close( properties );
 509         context->producer_properties = NULL;
 510         properties = mlt_service_properties( service );
 511
 512         // Set in and out
 513         mlt_transition_set_in_and_out( MLT_TRANSITION( service ),
 514                 mlt_properties_get_position( properties, "in" ),
 515                 mlt_properties_get_position( properties, "out" ) );
 516
 517         // Connect the filter to the producer
 518         mlt_transition_connect( MLT_TRANSITION( service ), producer,
 519                 mlt_properties_get_int( properties, "a_track" ),
 520                 mlt_properties_get_int( properties, "b_track" ) );
 521
 522         // Get the tractor from the stack
 523         mlt_service tractor = context_pop_service( context );
 524
 525         // Connect the tractor to the transition
 526         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 527
 528         // Push the tractor back onto the stack
 529         context_push_service( context, tractor );
 530
 531         // Push the transition onto the stack
 532         context_push_service( context, service );
 533 }
 534
 535 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
 536 {
 537         deserialise_context context = ( deserialise_context ) ctx;
 538
 539         if ( strcmp( name, "tractor" ) == 0 )
 540                 on_start_tractor( context, name, atts );
 541         else if ( strcmp( name, "multitrack" ) == 0 )
 542                 on_start_multitrack( context, name, atts );
 543         else if ( strcmp( name, "playlist" ) == 0 )
 544                 on_start_playlist( context, name, atts );
 545         else if ( strcmp( name, "producer" ) == 0 )
 546                 on_start_producer( context, name, atts );
 547         else if ( strcmp( name, "blank" ) == 0 )
 548                 on_start_blank( context, name, atts );
 549         else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
 550                 on_start_entry_track( context, name, atts );
 551         else if ( strcmp( name, "filter" ) == 0 )
 552                 on_start_filter( context, name, atts );
 553         else if ( strcmp( name, "transition" ) == 0 )
 554                 on_start_transition( context, name, atts );
 555         else if ( strcmp( name, "property" ) == 0 )
 556                 on_start_property( context, name, atts );
 557 }
 558
 559 static void on_end_element( void *ctx, const xmlChar *name )
 560 {
 561         deserialise_context context = ( deserialise_context ) ctx;
 562
 563         if ( strcmp( name, "multitrack" ) == 0 )
 564                 on_end_multitrack( context, name );
 565         else if ( strcmp( name, "playlist" ) == 0 )
 566                 on_end_playlist( context, name );
 567         else if ( strcmp( name, "track" ) == 0 )
 568                 on_end_track( context, name );
 569         else if ( strcmp( name, "entry" ) == 0 )
 570                 on_end_entry( context, name );
 571         else if ( strcmp( name, "tractor" ) == 0 )
 572                 on_end_tractor( context, name );
 573         else if ( strcmp( name, "property" ) == 0 )
 574                 on_end_property( context, name );
 575         else if ( strcmp( name, "producer" ) == 0 )
 576                 on_end_producer( context, name );
 577         else if ( strcmp( name, "filter" ) == 0 )
 578                 on_end_filter( context, name );
 579         else if ( strcmp( name, "transition" ) == 0 )
 580                 on_end_transition( context, name );
 581 }
 582
 583 static void on_characters( void *ctx, const xmlChar *ch, int len )
 584 {
 585         deserialise_context context = ( deserialise_context ) ctx;
 586         char *value = calloc( len + 1, 1 );
 587
 588         value[ len ] = 0;
 589         strncpy( value, (const char*) ch, len );
 590
 591         if ( context->property != NULL && context->producer_properties != NULL )
 592                 mlt_properties_set( context->producer_properties, context->property, value );
 593
 594         free( value);
 595 }
 596
 597 mlt_producer producer_westley_init( char *filename )
 598 {
 599         xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
 600         struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
 601         mlt_properties properties = NULL;
 602         int i = 0;
 603
 604         context->producer_map = mlt_properties_new();
 605         context->destructors = mlt_properties_new();
 606
 607         // We need to track the number of registered filters
 608         mlt_properties_set_int( context->destructors, "registered", 0 );
 609
 610         // We need the directory prefix which was used for the westley
 611         mlt_properties_set( context->producer_map, "_root", "" );
 612         if ( strchr( filename, '/' ) )
 613         {
 614                 char *root = NULL;
 615                 mlt_properties_set( context->producer_map, "_root", filename );
 616                 root = mlt_properties_get( context->producer_map, "_root" );
 617                 *( strrchr( root, '/' ) + 1 ) = '\0';
 618         }
 619
 620         sax->startElement = on_start_element;
 621         sax->endElement = on_end_element;
 622         sax->characters = on_characters;
 623
 624         // I REALLY DON'T GET THIS - HOW THE HELL CAN YOU REFERENCE A WESTLEY IN A WESTLEY???
 625         xmlInitParser();
 626
 627         xmlSAXUserParseFile( sax, context, filename );
 628
 629         // Need the complete producer list for various reasons
 630         properties = context->destructors;
 631
 632         // Get the last producer on the stack
 633         mlt_service service = context_pop_service( context );
 634
 635         // Do we actually have a producer here?
 636         if ( service != NULL )
 637         {
 638                 // Now make sure we don't have a reference to the service in the properties
 639                 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
 640                 {
 641                         char *name = mlt_properties_get_name( properties, i );
 642                         if ( mlt_properties_get_data( properties, name, NULL ) == service )
 643                         {
 644                                 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
 645                                 break;
 646                         }
 647                 }
 648
 649                 // We are done referencing destructor property list
 650                 // Set this var to service properties for convenience
 651                 properties = mlt_service_properties( service );
 652
 653                 // make the returned service destroy the connected services
 654                 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
 655
 656                 // Now assign additional properties
 657                 mlt_properties_set( properties, "resource", filename );
 658
 659                 // This tells consumer_westley not to deep copy
 660                 mlt_properties_set( properties, "westley", "was here" );
 661         }
 662         else
 663         {
 664                 // Clean up
 665                 mlt_properties_close( properties );
 666         }
 667
 668         free( context->stack_service );
 669         mlt_properties_close( context->producer_map );
 670         //free( context );
 671         free( sax );
 672         xmlCleanupParser();
 673         xmlMemoryDump( );
 674
 675
 676         return MLT_PRODUCER( service );
 677 }
 678