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         if ( mlt_properties_get( properties, "id" ) != NULL )
  97                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
  98
  99         context_push_service( context, service );
 100 }
 101
 102 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 103 {
 104         mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
 105         mlt_properties properties = mlt_service_properties( service );
 106
 107         track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
 108
 109         mlt_properties_set_position( properties, "length", 0 );
 110
 111         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 112                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 113
 114         context_push_service( context, service );
 115 }
 116
 117 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 118 {
 119         mlt_service service = mlt_playlist_service( mlt_playlist_init() );
 120         mlt_properties properties = mlt_service_properties( service );
 121
 122         track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
 123
 124         mlt_properties_set_position( properties, "length", 0 );
 125
 126         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 127         {
 128                 mlt_properties_set( properties, ( char* )atts[0], ( char* )atts[1] );
 129
 130                 // Out will be overwritten later as we append, so we need to save it
 131                 if ( strcmp( atts[ 0 ], "out" ) == 0 )
 132                         mlt_properties_set( properties, "_westley.out", ( char* )atts[ 1 ] );
 133         }
 134
 135         if ( mlt_properties_get( properties, "id" ) != NULL )
 136                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 137
 138         context_push_service( context, service );
 139 }
 140
 141 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 142 {
 143         mlt_properties properties = context->producer_properties = mlt_properties_new();
 144
 145         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 146         {
 147                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 148         }
 149 }
 150
 151 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 152 {
 153         // Get the playlist from the stack
 154         mlt_service service = context_pop_service( context );
 155         mlt_position length = 0;
 156
 157         // Look for the length attribute
 158         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 159         {
 160                 if ( strcmp( atts[0], "length" ) == 0 )
 161                 {
 162                         length = atoll( atts[1] );
 163                         break;
 164                 }
 165         }
 166
 167         // Append a blank to the playlist
 168         mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
 169
 170         // Push the playlist back onto the stack
 171         context_push_service( context, service );
 172 }
 173
 174 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 175 {
 176         // Use a dummy service to hold properties to allow arbitratry nesting
 177         mlt_service service = calloc( 1, sizeof( struct mlt_service_s ) );
 178         mlt_service_init( service, NULL );
 179
 180         // Push the dummy service onto the stack
 181         context_push_service( context, service );
 182
 183         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 184         {
 185                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
 186
 187                 // Look for the producer attribute
 188                 if ( strcmp( atts[ 0 ], "producer" ) == 0 )
 189                 {
 190                         if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) !=  NULL )
 191                                 // Push the referenced producer onto the stack
 192                                 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
 193                 }
 194         }
 195 }
 196
 197 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 198 {
 199         mlt_properties properties = context->producer_properties = mlt_properties_new();
 200
 201         // Set the properties
 202         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 203                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 204 }
 205
 206 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 207 {
 208         mlt_properties properties = context->producer_properties = mlt_properties_new();
 209
 210         // Set the properties
 211         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 212                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 213 }
 214
 215 static void on_start_property( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 216 {
 217         mlt_properties properties = context->producer_properties;
 218         char *value = NULL;
 219
 220         if ( properties == NULL )
 221                 return;
 222
 223         // Set the properties
 224         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 225         {
 226                 if ( strcmp( atts[ 0 ], "name" ) == 0 )
 227                 {
 228                         context->property = strdup( atts[ 1 ] );
 229                 }
 230                 else if ( strcmp( atts[ 0 ], "value" ) == 0 )
 231                 {
 232                         value = (char*) atts[ 1 ];
 233                 }
 234         }
 235
 236         if ( context->property != NULL && value != NULL )
 237                 mlt_properties_set( properties, context->property, value );
 238 }
 239
 240 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
 241 {
 242         // Get the producer (multitrack) from the stack
 243         mlt_service producer = context_pop_service( context );
 244
 245         // Get the tractor from the stack
 246         mlt_service service = context_pop_service( context );
 247
 248         // Connect the tractor to the producer
 249         mlt_tractor_connect( MLT_TRACTOR( service ), producer );
 250         mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
 251                 MLT_MULTITRACK( producer ), 0, NULL, NULL );
 252
 253         // Push the tractor back onto the stack
 254         context_push_service( context, service );
 255
 256         // Push the producer back onto the stack
 257         context_push_service( context, producer );
 258 }
 259
 260 static void on_end_playlist( deserialise_context context, const xmlChar *name )
 261 {
 262         // Get the playlist from the stack
 263         mlt_service service = context_pop_service( context );
 264         mlt_properties properties = mlt_service_properties( service );
 265
 266         mlt_position in = mlt_properties_get_position( properties, "in" );
 267         mlt_position out;
 268
 269         if ( mlt_properties_get( properties, "_westley.out" ) != NULL )
 270                 out = mlt_properties_get_position( properties, "_westley.out" );
 271         else
 272                 out = mlt_properties_get_position( properties, "length" ) - 1;
 273
 274         if ( mlt_properties_get_position( properties, "length" ) < out )
 275                 mlt_properties_set_position( properties, "length", out  + 1 );
 276
 277         mlt_producer_set_in_and_out( MLT_PRODUCER( service ), in, out );
 278
 279         // Push the playlist back onto the stack
 280         context_push_service( context, service );
 281 }
 282
 283 static void on_end_track( deserialise_context context, const xmlChar *name )
 284 {
 285         // Get the producer from the stack
 286         mlt_service producer = context_pop_service( context );
 287
 288         // Get the dummy track service from the stack
 289         mlt_service track = context_pop_service( context );
 290
 291         // Get the multitrack from the stack
 292         mlt_service service = context_pop_service( context );
 293
 294         // Set the track on the multitrack
 295         mlt_multitrack_connect( MLT_MULTITRACK( service ),
 296                 MLT_PRODUCER( producer ),
 297                 mlt_multitrack_count( MLT_MULTITRACK( service ) ) );
 298
 299         // Set producer i/o if specified
 300         if ( mlt_properties_get( mlt_service_properties( track ), "in" ) != NULL ||
 301                 mlt_properties_get( mlt_service_properties( track ), "out" ) != NULL )
 302         {
 303                 mlt_producer_set_in_and_out( MLT_PRODUCER( producer ),
 304                         mlt_properties_get_position( mlt_service_properties( track ), "in" ),
 305                         mlt_properties_get_position( mlt_service_properties( track ), "out" ) );
 306         }
 307
 308         // Push the multitrack back onto the stack
 309         context_push_service( context, service );
 310
 311         mlt_service_close( track );
 312 }
 313
 314 static void on_end_entry( deserialise_context context, const xmlChar *name )
 315 {
 316         // Get the producer from the stack
 317         mlt_service producer = context_pop_service( context );
 318
 319         // Get the dummy entry service from the stack
 320         mlt_service entry = context_pop_service( context );
 321
 322         // Get the playlist from the stack
 323         mlt_service service = context_pop_service( context );
 324
 325         // Append the producer to the playlist
 326         if ( mlt_properties_get( mlt_service_properties( entry ), "in" ) != NULL ||
 327                 mlt_properties_get( mlt_service_properties( entry ), "out" ) != NULL )
 328         {
 329                 mlt_playlist_append_io( MLT_PLAYLIST( service ),
 330                         MLT_PRODUCER( producer ),
 331                         mlt_properties_get_position( mlt_service_properties( entry ), "in" ),
 332                         mlt_properties_get_position( mlt_service_properties( entry ), "out" ) );
 333         }
 334         else
 335         {
 336                 mlt_playlist_append( MLT_PLAYLIST( service ), MLT_PRODUCER( producer ) );
 337         }
 338
 339         // Push the playlist back onto the stack
 340         context_push_service( context, service );
 341
 342         mlt_service_close( entry );
 343 }
 344
 345 static void on_end_tractor( deserialise_context context, const xmlChar *name )
 346 {
 347         // Get and discard the last producer
 348         mlt_producer multitrack = MLT_PRODUCER( context_pop_service( context ) );
 349
 350         // Get the tractor
 351         mlt_service tractor = context_pop_service( context );
 352         multitrack = mlt_properties_get_data( mlt_service_properties( tractor ), "multitrack", NULL );
 353
 354         // Inherit the producer's properties
 355         mlt_properties properties = mlt_producer_properties( multitrack );
 356         mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
 357         mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
 358         mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
 359
 360         // Push the playlist back onto the stack
 361         context_push_service( context, tractor );
 362 }
 363
 364 static void on_end_property( deserialise_context context, const xmlChar *name )
 365 {
 366         // Close this property handling
 367         free( context->property );
 368         context->property = NULL;
 369 }
 370
 371 static void on_end_producer( deserialise_context context, const xmlChar *name )
 372 {
 373         mlt_properties properties = context->producer_properties;
 374         mlt_service service = NULL;
 375
 376         if ( properties == NULL )
 377                 return;
 378
 379         // Instantiate the producer
 380         if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
 381         {
 382                 service = MLT_SERVICE( mlt_factory_producer( "fezzik", mlt_properties_get( properties, "mlt_service" ) ) );
 383         }
 384         if ( service == NULL && mlt_properties_get( properties, "resource" ) != NULL )
 385         {
 386                 char *root = mlt_properties_get( context->producer_map, "_root" );
 387                 char *resource = mlt_properties_get( properties, "resource" );
 388                 char *full_resource = malloc( strlen( root ) + strlen( resource ) + 1 );
 389                 if ( resource[ 0 ] != '/' )
 390                 {
 391                         strcpy( full_resource, root );
 392                         strcat( full_resource, resource );
 393                 }
 394                 else
 395                 {
 396                         strcpy( full_resource, resource );
 397                 }
 398                 service = MLT_SERVICE( mlt_factory_producer( "fezzik", full_resource ) );
 399                 free( full_resource );
 400         }
 401
 402         track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
 403
 404         // Add the producer to the producer map
 405         if ( mlt_properties_get( properties, "id" ) != NULL )
 406                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 407
 408         mlt_properties_inherit( mlt_service_properties( service ), properties );
 409         mlt_properties_close( properties );
 410         context->producer_properties = NULL;
 411         properties = mlt_service_properties( service );
 412
 413         // Set in and out
 414         mlt_producer_set_in_and_out( MLT_PRODUCER( service ),
 415                 mlt_properties_get_position( properties, "in" ),
 416                 mlt_properties_get_position( properties, "out" ) );
 417
 418         // Push the new producer onto the stack
 419         context_push_service( context, service );
 420 }
 421
 422 static void on_end_filter( deserialise_context context, const xmlChar *name )
 423 {
 424         mlt_properties properties = context->producer_properties;
 425         if ( properties == NULL )
 426                 return;
 427
 428         char *id;
 429         char key[11];
 430         key[ 10 ] = '\0';
 431
 432         // Get the producer from the stack
 433         mlt_service producer = context_pop_service( context );
 434 //fprintf( stderr, "connecting filter to %s\n", mlt_properties_get( mlt_service_properties( producer ), "resource" ) );
 435
 436         // Create the filter
 437         mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 438
 439         track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
 440
 441         // Connect the filter to the producer
 442         mlt_filter_connect( MLT_FILTER( service ), producer,
 443                 mlt_properties_get_int( properties, "track" ) );
 444
 445         // Set in and out from producer if non existant
 446         if ( mlt_properties_get( properties, "in" ) == NULL )
 447                 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
 448         if ( mlt_properties_get( properties, "out" ) == NULL )
 449                 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
 450
 451         // Propogate the properties
 452         mlt_properties_inherit( mlt_service_properties( service ), properties );
 453         mlt_properties_close( properties );
 454         context->producer_properties = NULL;
 455         properties = mlt_service_properties( service );
 456
 457         // Set in and out
 458 //fprintf( stderr, "setting filter in %d out %d\n", mlt_properties_get_position( properties, "in" ), mlt_properties_get_position( properties, "out" ) );
 459         mlt_filter_set_in_and_out( MLT_FILTER( service ),
 460                 mlt_properties_get_position( properties, "in" ),
 461                 mlt_properties_get_position( properties, "out" ) );
 462
 463         // Get the parent producer from the stack
 464         mlt_service tractor = context_pop_service( context );
 465
 466         if ( tractor != NULL )
 467         {
 468 //fprintf( stderr, "connecting tractor %s to filter\n", mlt_properties_get( mlt_service_properties( tractor ), "resource" ) );
 469                 // Connect the tractor to the filter
 470                 if ( strcmp( mlt_properties_get( mlt_service_properties( tractor ), "resource" ), "<tractor>" ) == 0 )
 471                         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 472
 473                 // Push the parent producer back onto the stack
 474                 context_push_service( context, tractor );
 475         }
 476
 477 //fprintf( stderr, "setting filter in %d out %d\n", mlt_properties_get_position( properties, "in" ), mlt_properties_get_position( properties, "out" ) );
 478         // If a producer alias is in the producer_map, get it
 479         snprintf( key, 10, "%p", producer );
 480         if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
 481                 producer = mlt_properties_get_data( context->producer_map, key, NULL );
 482
 483         // Put the producer in the producer map
 484         id = mlt_properties_get( mlt_service_properties( producer ), "id" );
 485         if ( id != NULL )
 486                 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
 487
 488         // For filter chain support, add an alias to the producer map
 489         snprintf( key, 10, "%p", service );
 490         mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
 491
 492         // Push the filter onto the stack
 493         context_push_service( context, service );
 494
 495 }
 496
 497 static void on_end_transition( deserialise_context context, const xmlChar *name )
 498 {
 499         mlt_properties properties = context->producer_properties;
 500         if ( properties == NULL )
 501                 return;
 502
 503         // Get the producer from the stack
 504         mlt_service producer = context_pop_service( context );
 505
 506         // Create the transition
 507         mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 508
 509         track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
 510
 511         // Propogate the properties
 512         mlt_properties_inherit( mlt_service_properties( service ), properties );
 513         mlt_properties_close( properties );
 514         context->producer_properties = NULL;
 515         properties = mlt_service_properties( service );
 516
 517         // Set in and out
 518         mlt_transition_set_in_and_out( MLT_TRANSITION( service ),
 519                 mlt_properties_get_position( properties, "in" ),
 520                 mlt_properties_get_position( properties, "out" ) );
 521
 522         // Connect the filter to the producer
 523         mlt_transition_connect( MLT_TRANSITION( service ), producer,
 524                 mlt_properties_get_int( properties, "a_track" ),
 525                 mlt_properties_get_int( properties, "b_track" ) );
 526
 527         // Get the tractor from the stack
 528         mlt_service tractor = context_pop_service( context );
 529
 530         // Connect the tractor to the transition
 531         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 532
 533         // Push the tractor back onto the stack
 534         context_push_service( context, tractor );
 535
 536         // Push the transition onto the stack
 537         context_push_service( context, service );
 538 }
 539
 540 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
 541 {
 542         deserialise_context context = ( deserialise_context ) ctx;
 543
 544         if ( strcmp( name, "tractor" ) == 0 )
 545                 on_start_tractor( context, name, atts );
 546         else if ( strcmp( name, "multitrack" ) == 0 )
 547                 on_start_multitrack( context, name, atts );
 548         else if ( strcmp( name, "playlist" ) == 0 )
 549                 on_start_playlist( context, name, atts );
 550         else if ( strcmp( name, "producer" ) == 0 )
 551                 on_start_producer( context, name, atts );
 552         else if ( strcmp( name, "blank" ) == 0 )
 553                 on_start_blank( context, name, atts );
 554         else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
 555                 on_start_entry_track( context, name, atts );
 556         else if ( strcmp( name, "filter" ) == 0 )
 557                 on_start_filter( context, name, atts );
 558         else if ( strcmp( name, "transition" ) == 0 )
 559                 on_start_transition( context, name, atts );
 560         else if ( strcmp( name, "property" ) == 0 )
 561                 on_start_property( context, name, atts );
 562 }
 563
 564 static void on_end_element( void *ctx, const xmlChar *name )
 565 {
 566         deserialise_context context = ( deserialise_context ) ctx;
 567
 568         if ( strcmp( name, "multitrack" ) == 0 )
 569                 on_end_multitrack( context, name );
 570         else if ( strcmp( name, "playlist" ) == 0 )
 571                 on_end_playlist( context, name );
 572         else if ( strcmp( name, "track" ) == 0 )
 573                 on_end_track( context, name );
 574         else if ( strcmp( name, "entry" ) == 0 )
 575                 on_end_entry( context, name );
 576         else if ( strcmp( name, "tractor" ) == 0 )
 577                 on_end_tractor( context, name );
 578         else if ( strcmp( name, "property" ) == 0 )
 579                 on_end_property( context, name );
 580         else if ( strcmp( name, "producer" ) == 0 )
 581                 on_end_producer( context, name );
 582         else if ( strcmp( name, "filter" ) == 0 )
 583                 on_end_filter( context, name );
 584         else if ( strcmp( name, "transition" ) == 0 )
 585                 on_end_transition( context, name );
 586 }
 587
 588 static void on_characters( void *ctx, const xmlChar *ch, int len )
 589 {
 590         deserialise_context context = ( deserialise_context ) ctx;
 591         char *value = calloc( len + 1, 1 );
 592
 593         value[ len ] = 0;
 594         strncpy( value, (const char*) ch, len );
 595
 596         if ( context->property != NULL && context->producer_properties != NULL )
 597                 mlt_properties_set( context->producer_properties, context->property, value );
 598
 599         free( value);
 600 }
 601
 602 mlt_producer producer_westley_init( char *filename )
 603 {
 604         xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
 605         struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
 606         mlt_properties properties = NULL;
 607         int i = 0;
 608
 609         context->producer_map = mlt_properties_new();
 610         context->destructors = mlt_properties_new();
 611
 612         // We need to track the number of registered filters
 613         mlt_properties_set_int( context->destructors, "registered", 0 );
 614
 615         // We need the directory prefix which was used for the westley
 616         mlt_properties_set( context->producer_map, "_root", "" );
 617         if ( strchr( filename, '/' ) )
 618         {
 619                 char *root = NULL;
 620                 mlt_properties_set( context->producer_map, "_root", filename );
 621                 root = mlt_properties_get( context->producer_map, "_root" );
 622                 *( strrchr( root, '/' ) + 1 ) = '\0';
 623         }
 624
 625         sax->startElement = on_start_element;
 626         sax->endElement = on_end_element;
 627         sax->characters = on_characters;
 628         sax->cdataBlock = on_characters;
 629
 630         // I REALLY DON'T GET THIS - HOW THE HELL CAN YOU REFERENCE A WESTLEY IN A WESTLEY???
 631         xmlInitParser();
 632
 633         xmlSAXUserParseFile( sax, context, filename );
 634
 635         // Need the complete producer list for various reasons
 636         properties = context->destructors;
 637
 638         // Get the last producer on the stack
 639         mlt_service service = context_pop_service( context );
 640
 641         // Do we actually have a producer here?
 642         if ( service != NULL )
 643         {
 644                 // Now make sure we don't have a reference to the service in the properties
 645                 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
 646                 {
 647                         char *name = mlt_properties_get_name( properties, i );
 648                         if ( mlt_properties_get_data( properties, name, NULL ) == service )
 649                         {
 650                                 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
 651                                 break;
 652                         }
 653                 }
 654
 655                 // We are done referencing destructor property list
 656                 // Set this var to service properties for convenience
 657                 properties = mlt_service_properties( service );
 658
 659                 // make the returned service destroy the connected services
 660                 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
 661
 662                 // Now assign additional properties
 663                 mlt_properties_set( properties, "resource", filename );
 664
 665                 // This tells consumer_westley not to deep copy
 666                 mlt_properties_set( properties, "westley", "was here" );
 667         }
 668         else
 669         {
 670                 // Clean up
 671                 mlt_properties_close( properties );
 672         }
 673
 674         free( context->stack_service );
 675         mlt_properties_close( context->producer_map );
 676         //free( context );
 677         free( sax );
 678         //xmlCleanupParser();
 679         xmlMemoryDump( );
 680
 681
 682         return MLT_PRODUCER( service );
 683 }