git.sesse.net Git - mlt/blob - src/modules/westley/consumer_westley.c

   1 /*
   2  * consumer_westley.c -- a libxml2 serialiser 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 #include "consumer_westley.h"
  22 #include <framework/mlt.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <pthread.h>
  27 #include <unistd.h>
  28 #include <libxml/tree.h>
  29
  30 #define ID_SIZE 128
  31
  32 // This maintains counters for adding ids to elements
  33 struct serialise_context_s
  34 {
  35         mlt_properties id_map;
  36         int producer_count;
  37         int multitrack_count;
  38         int playlist_count;
  39         int tractor_count;
  40         int filter_count;
  41         int transition_count;
  42         int pass;
  43         mlt_properties hide_map;
  44         char *root;
  45         char *store;
  46 };
  47 typedef struct serialise_context_s* serialise_context;
  48
  49 /** Forward references to static functions.
  50 */
  51
  52 static int consumer_start( mlt_consumer parent );
  53 static int consumer_is_stopped( mlt_consumer this );
  54 static void serialise_service( serialise_context context, mlt_service service, xmlNode *node );
  55
  56 typedef enum
  57 {
  58         westley_existing,
  59         westley_producer,
  60         westley_multitrack,
  61         westley_playlist,
  62         westley_tractor,
  63         westley_filter,
  64         westley_transition
  65 }
  66 westley_type;
  67
  68 /** Create or retrieve an id associated to this service.
  69 */
  70
  71 static char *westley_get_id( serialise_context context, mlt_service service, westley_type type )
  72 {
  73         char *id = NULL;
  74         int i = 0;
  75         mlt_properties map = context->id_map;
  76
  77         // Search the map for the service
  78         for ( i = 0; i < mlt_properties_count( map ); i ++ )
  79                 if ( mlt_properties_get_data_at( map, i, NULL ) == service )
  80                         break;
  81
  82         // If the service is not in the map, and the type indicates a new id is needed...
  83         if ( i >= mlt_properties_count( map ) && type != westley_existing )
  84         {
  85                 // Attempt to reuse existing id
  86                 id = mlt_properties_get( mlt_service_properties( service ), "id" );
  87
  88                 // If no id, or the id is used in the map (for another service), then
  89                 // create a new one.
  90                 if ( id == NULL || mlt_properties_get_data( map, id, NULL ) != NULL )
  91                 {
  92                         char temp[ ID_SIZE ];
  93                         do
  94                         {
  95                                 switch( type )
  96                                 {
  97                                         case westley_producer:
  98                                                 sprintf( temp, "producer%d", context->producer_count ++ );
  99                                                 break;
 100                                         case westley_multitrack:
 101                                                 sprintf( temp, "multitrack%d", context->multitrack_count ++ );
 102                                                 break;
 103                                         case westley_playlist:
 104                                                 sprintf( temp, "playlist%d", context->playlist_count ++ );
 105                                                 break;
 106                                         case westley_tractor:
 107                                                 sprintf( temp, "tractor%d", context->tractor_count ++ );
 108                                                 break;
 109                                         case westley_filter:
 110                                                 sprintf( temp, "filter%d", context->filter_count ++ );
 111                                                 break;
 112                                         case westley_transition:
 113                                                 sprintf( temp, "transition%d", context->transition_count ++ );
 114                                                 break;
 115                                         case westley_existing:
 116                                                 // Never gets here
 117                                                 break;
 118                                 }
 119                         }
 120                         while( mlt_properties_get_data( map, temp, NULL ) != NULL );
 121
 122                         // Set the data at the generated name
 123                         mlt_properties_set_data( map, temp, service, 0, NULL, NULL );
 124
 125                         // Get the pointer to the name (i is the end of the list)
 126                         id = mlt_properties_get_name( map, i );
 127                 }
 128                 else
 129                 {
 130                         // Store the existing id in the map
 131                         mlt_properties_set_data( map, id, service, 0, NULL, NULL );
 132                 }
 133         }
 134         else if ( type == westley_existing )
 135         {
 136                 id = mlt_properties_get_name( map, i );
 137         }
 138
 139         return id;
 140 }
 141
 142 /** This is what will be called by the factory - anything can be passed in
 143         via the argument, but keep it simple.
 144 */
 145
 146 mlt_consumer consumer_westley_init( char *arg )
 147 {
 148         // Create the consumer object
 149         mlt_consumer this = calloc( sizeof( struct mlt_consumer_s ), 1 );
 150
 151         // If no malloc'd and consumer init ok
 152         if ( this != NULL && mlt_consumer_init( this, NULL ) == 0 )
 153         {
 154                 // Allow thread to be started/stopped
 155                 this->start = consumer_start;
 156                 this->is_stopped = consumer_is_stopped;
 157
 158                 mlt_properties_set( mlt_consumer_properties( this ), "resource", arg );
 159
 160                 // Return the consumer produced
 161                 return this;
 162         }
 163
 164         // malloc or consumer init failed
 165         free( this );
 166
 167         // Indicate failure
 168         return NULL;
 169 }
 170
 171 static inline void serialise_properties( serialise_context context, mlt_properties properties, xmlNode *node )
 172 {
 173         int i;
 174         xmlNode *p;
 175
 176         // Enumerate the properties
 177         for ( i = 0; i < mlt_properties_count( properties ); i++ )
 178         {
 179                 char *name = mlt_properties_get_name( properties, i );
 180                 if ( name != NULL &&
 181                          name[ 0 ] != '_' &&
 182                          mlt_properties_get_value( properties, i ) != NULL &&
 183                          strcmp( name, "westley" ) != 0 &&
 184                          strcmp( name, "in" ) != 0 &&
 185                          strcmp( name, "out" ) != 0 &&
 186                          strcmp( name, "id" ) != 0 &&
 187                          strcmp( name, "root" ) != 0 &&
 188                          strcmp( name, "width" ) != 0 &&
 189                          strcmp( name, "height" ) != 0 )
 190                 {
 191                         char *value = mlt_properties_get_value( properties, i );
 192                         p = xmlNewChild( node, NULL, "property", NULL );
 193                         xmlNewProp( p, "name", mlt_properties_get_name( properties, i ) );
 194                         if ( strcmp( context->root, "" ) && !strncmp( value, context->root, strlen( context->root ) ) )
 195                                 xmlNodeSetContent( p, value + strlen( context->root ) + 1 );
 196                         else
 197                                 xmlNodeSetContent( p, value );
 198                 }
 199         }
 200 }
 201
 202 static inline void serialise_store_properties( serialise_context context, mlt_properties properties, xmlNode *node )
 203 {
 204         int i;
 205         xmlNode *p;
 206
 207         // Enumerate the properties
 208         for ( i = 0; context->store != NULL && i < mlt_properties_count( properties ); i++ )
 209         {
 210                 char *name = mlt_properties_get_name( properties, i );
 211                 if ( !strncmp( name, context->store, strlen( context->store ) ) )
 212                 {
 213                         char *value = mlt_properties_get_value( properties, i );
 214                         if ( value != NULL )
 215                         {
 216                                 p = xmlNewChild( node, NULL, "property", NULL );
 217                                 xmlNewProp( p, "name", mlt_properties_get_name( properties, i ) );
 218                                 if ( context->root != NULL && strcmp( context->root, "" ) && !strncmp( value, context->root, strlen( context->root ) ) )
 219                                         xmlNodeSetContent( p, value + strlen( context->root ) + 1 );
 220                                 else
 221                                         xmlNodeSetContent( p, value );
 222                         }
 223                 }
 224         }
 225 }
 226
 227 static inline void serialise_service_filters( serialise_context context, mlt_service service, xmlNode *node )
 228 {
 229         int i;
 230         xmlNode *p;
 231         mlt_filter filter = NULL;
 232
 233         // Enumerate the filters
 234         for ( i = 0; ( filter = mlt_producer_filter( MLT_PRODUCER( service ), i ) ) != NULL; i ++ )
 235         {
 236                 mlt_properties properties = mlt_filter_properties( filter );
 237                 if ( mlt_properties_get_int( properties, "_fezzik" ) == 0 )
 238                 {
 239                         // Get a new id - if already allocated, do nothing
 240                         char *id = westley_get_id( context, mlt_filter_service( filter ), westley_filter );
 241                         if ( id != NULL )
 242                         {
 243                                 int in = mlt_properties_get_position( properties, "in" );
 244                                 int out = mlt_properties_get_position( properties, "out" );
 245                                 p = xmlNewChild( node, NULL, "filter", NULL );
 246                                 xmlNewProp( p, "id", id );
 247                                 if ( in != 0 || out != 0 )
 248                                 {
 249                                         char temp[ 20 ];
 250                                         sprintf( temp, "%d", in );
 251                                         xmlNewProp( p, "in", temp );
 252                                         sprintf( temp, "%d", out );
 253                                         xmlNewProp( p, "out", temp );
 254                                 }
 255                                 serialise_properties( context, properties, p );
 256                                 serialise_service_filters( context, mlt_filter_service( filter ), p );
 257                         }
 258                 }
 259         }
 260 }
 261
 262 static void serialise_producer( serialise_context context, mlt_service service, xmlNode *node )
 263 {
 264         xmlNode *child = node;
 265         mlt_service parent = MLT_SERVICE( mlt_producer_cut_parent( MLT_PRODUCER( service ) ) );
 266
 267         if ( context->pass == 0 )
 268         {
 269                 mlt_properties properties = mlt_service_properties( parent );
 270                 // Get a new id - if already allocated, do nothing
 271                 char *id = westley_get_id( context, parent, westley_producer );
 272                 if ( id == NULL )
 273                         return;
 274
 275                 child = xmlNewChild( node, NULL, "producer", NULL );
 276
 277                 // Set the id
 278                 xmlNewProp( child, "id", id );
 279                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 280                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 281                 serialise_properties( context, properties, child );
 282                 serialise_service_filters( context, service, child );
 283
 284                 // Add producer to the map
 285                 mlt_properties_set_int( context->hide_map, id, mlt_properties_get_int( properties, "hide" ) );
 286         }
 287         else
 288         {
 289                 char *id = westley_get_id( context, parent, westley_existing );
 290                 mlt_properties properties = mlt_service_properties( service );
 291                 xmlNewProp( node, "parent", id );
 292                 xmlNewProp( node, "in", mlt_properties_get( properties, "in" ) );
 293                 xmlNewProp( node, "out", mlt_properties_get( properties, "out" ) );
 294         }
 295 }
 296
 297 static void serialise_tractor( serialise_context context, mlt_service service, xmlNode *node );
 298
 299 static void serialise_multitrack( serialise_context context, mlt_service service, xmlNode *node )
 300 {
 301         int i;
 302
 303         if ( context->pass == 0 )
 304         {
 305                 // Iterate over the tracks to collect the producers
 306                 for ( i = 0; i < mlt_multitrack_count( MLT_MULTITRACK( service ) ); i++ )
 307                 {
 308                         mlt_producer producer = mlt_producer_cut_parent( mlt_multitrack_track( MLT_MULTITRACK( service ), i ) );
 309                         serialise_service( context, MLT_SERVICE( producer ), node );
 310                 }
 311         }
 312         else
 313         {
 314                 // Get a new id - if already allocated, do nothing
 315                 char *id = westley_get_id( context, service, westley_multitrack );
 316                 if ( id == NULL )
 317                         return;
 318
 319                 // Serialise the tracks
 320                 for ( i = 0; i < mlt_multitrack_count( MLT_MULTITRACK( service ) ); i++ )
 321                 {
 322                         xmlNode *track = xmlNewChild( node, NULL, "track", NULL );
 323                         int hide = 0;
 324                         mlt_producer producer = mlt_multitrack_track( MLT_MULTITRACK( service ), i );
 325                         mlt_properties properties = mlt_producer_properties( producer );
 326
 327                         mlt_service parent = MLT_SERVICE( mlt_producer_cut_parent( producer ) );
 328
 329                         char *id = westley_get_id( context, MLT_SERVICE( parent ), westley_existing );
 330                         xmlNewProp( track, "producer", id );
 331                         if ( mlt_properties_get_int( properties, "_cut" ) == 1 )
 332                         {
 333                                 xmlNewProp( track, "in", mlt_properties_get( properties, "in" ) );
 334                                 xmlNewProp( track, "out", mlt_properties_get( properties, "out" ) );
 335                         }
 336
 337                         hide = mlt_properties_get_int( context->hide_map, id );
 338                         if ( hide )
 339                                 xmlNewProp( track, "hide", hide == 1 ? "video" : ( hide == 2 ? "audio" : "both" ) );
 340                 }
 341                 serialise_service_filters( context, service, node );
 342         }
 343 }
 344
 345 static void serialise_playlist( serialise_context context, mlt_service service, xmlNode *node )
 346 {
 347         int i;
 348         xmlNode *child = node;
 349         mlt_playlist_clip_info info;
 350         mlt_properties properties = mlt_service_properties( service );
 351
 352         if ( context->pass == 0 )
 353         {
 354                 // Get a new id - if already allocated, do nothing
 355                 char *id = westley_get_id( context, service, westley_playlist );
 356                 if ( id == NULL )
 357                         return;
 358
 359                 // Iterate over the playlist entries to collect the producers
 360                 for ( i = 0; i < mlt_playlist_count( MLT_PLAYLIST( service ) ); i++ )
 361                 {
 362                         if ( ! mlt_playlist_get_clip_info( MLT_PLAYLIST( service ), &info, i ) )
 363                         {
 364                                 if ( info.producer != NULL )
 365                                 {
 366                                         mlt_producer producer = mlt_producer_cut_parent( info.producer );
 367                                         char *service_s = mlt_properties_get( mlt_producer_properties( producer ), "mlt_service" );
 368                                         char *resource_s = mlt_properties_get( mlt_producer_properties( producer ), "resource" );
 369                                         if ( resource_s != NULL && !strcmp( resource_s, "<playlist>" ) )
 370                                                 serialise_playlist( context, MLT_SERVICE( producer ), node );
 371                                         else if ( service_s != NULL && strcmp( service_s, "blank" ) != 0 )
 372                                                 serialise_service( context, MLT_SERVICE( producer ), node );
 373                                 }
 374                         }
 375                 }
 376
 377                 child = xmlNewChild( node, NULL, "playlist", NULL );
 378
 379                 // Set the id
 380                 xmlNewProp( child, "id", id );
 381
 382                 // Store application specific properties
 383                 serialise_store_properties( context, properties, child );
 384
 385                 // Add producer to the map
 386                 mlt_properties_set_int( context->hide_map, id, mlt_properties_get_int( properties, "hide" ) );
 387
 388                 // Iterate over the playlist entries
 389                 for ( i = 0; i < mlt_playlist_count( MLT_PLAYLIST( service ) ); i++ )
 390                 {
 391                         if ( ! mlt_playlist_get_clip_info( MLT_PLAYLIST( service ), &info, i ) )
 392                         {
 393                                 mlt_producer producer = mlt_producer_cut_parent( info.producer );
 394                                 char *service_s = mlt_properties_get( mlt_producer_properties( producer ), "mlt_service" );
 395                                 if ( service_s != NULL && strcmp( service_s, "blank" ) == 0 )
 396                                 {
 397                                         char length[ 20 ];
 398                                         length[ 19 ] = '\0';
 399                                         xmlNode *entry = xmlNewChild( child, NULL, "blank", NULL );
 400                                         snprintf( length, 19, "%d", info.frame_count );
 401                                         xmlNewProp( entry, "length", length );
 402                                 }
 403                                 else
 404                                 {
 405                                         char temp[ 20 ];
 406                                         xmlNode *entry = xmlNewChild( child, NULL, "entry", NULL );
 407                                         id = westley_get_id( context, MLT_SERVICE( producer ), westley_existing );
 408                                         xmlNewProp( entry, "producer", id );
 409                                         sprintf( temp, "%d", info.frame_in );
 410                                         xmlNewProp( entry, "in", temp );
 411                                         sprintf( temp, "%d", info.frame_out );
 412                                         xmlNewProp( entry, "out", temp );
 413                                         if ( info.repeat > 1 )
 414                                         {
 415                                                 sprintf( temp, "%d", info.repeat );
 416                                                 xmlNewProp( entry, "repeat", temp );
 417                                         }
 418                                         if ( mlt_producer_is_cut( info.cut ) )
 419                                                 serialise_service_filters( context, mlt_producer_service( info.cut ), entry );
 420                                 }
 421                         }
 422                 }
 423
 424                 serialise_service_filters( context, service, child );
 425         }
 426         else if ( strcmp( (const char*) node->name, "tractor" ) != 0 )
 427         {
 428                 char *id = westley_get_id( context, service, westley_existing );
 429                 xmlNewProp( node, "producer", id );
 430         }
 431 }
 432
 433 static void serialise_tractor( serialise_context context, mlt_service service, xmlNode *node )
 434 {
 435         xmlNode *child = node;
 436         mlt_properties properties = mlt_service_properties( service );
 437
 438         if ( context->pass == 0 )
 439         {
 440                 // Recurse on connected producer
 441                 serialise_service( context, mlt_service_producer( service ), node );
 442         }
 443         else
 444         {
 445                 // Get a new id - if already allocated, do nothing
 446                 char *id = westley_get_id( context, service, westley_tractor );
 447                 if ( id == NULL )
 448                         return;
 449
 450                 child = xmlNewChild( node, NULL, "tractor", NULL );
 451
 452                 // Set the id
 453                 xmlNewProp( child, "id", id );
 454                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 455                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 456
 457                 // Store application specific properties
 458                 serialise_store_properties( context, mlt_service_properties( service ), child );
 459
 460                 // Recurse on connected producer
 461                 serialise_service( context, mlt_service_producer( service ), child );
 462                 serialise_service_filters( context, service, child );
 463         }
 464 }
 465
 466 static void serialise_filter( serialise_context context, mlt_service service, xmlNode *node )
 467 {
 468         xmlNode *child = node;
 469         mlt_properties properties = mlt_service_properties( service );
 470
 471         // Recurse on connected producer
 472         serialise_service( context, mlt_service_producer( service ), node );
 473
 474         if ( context->pass == 1 )
 475         {
 476                 // Get a new id - if already allocated, do nothing
 477                 char *id = westley_get_id( context, service, westley_filter );
 478                 if ( id == NULL )
 479                         return;
 480
 481                 child = xmlNewChild( node, NULL, "filter", NULL );
 482
 483                 // Set the id
 484                 xmlNewProp( child, "id", id );
 485                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 486                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 487
 488                 serialise_properties( context, properties, child );
 489                 serialise_service_filters( context, service, child );
 490         }
 491 }
 492
 493 static void serialise_transition( serialise_context context, mlt_service service, xmlNode *node )
 494 {
 495         xmlNode *child = node;
 496         mlt_properties properties = mlt_service_properties( service );
 497
 498         // Recurse on connected producer
 499         serialise_service( context, MLT_SERVICE( MLT_TRANSITION( service )->producer ), node );
 500
 501         if ( context->pass == 1 )
 502         {
 503                 // Get a new id - if already allocated, do nothing
 504                 char *id = westley_get_id( context, service, westley_transition );
 505                 if ( id == NULL )
 506                         return;
 507
 508                 child = xmlNewChild( node, NULL, "transition", NULL );
 509
 510                 // Set the id
 511                 xmlNewProp( child, "id", id );
 512                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 513                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 514
 515                 serialise_properties( context, properties, child );
 516                 serialise_service_filters( context, service, child );
 517         }
 518 }
 519
 520 static void serialise_service( serialise_context context, mlt_service service, xmlNode *node )
 521 {
 522         // Iterate over consumer/producer connections
 523         while ( service != NULL )
 524         {
 525                 mlt_properties properties = mlt_service_properties( service );
 526                 char *mlt_type = mlt_properties_get( properties, "mlt_type" );
 527
 528                 // Tell about the producer
 529                 if ( strcmp( mlt_type, "producer" ) == 0 )
 530                 {
 531                         char *mlt_service = mlt_properties_get( properties, "mlt_service" );
 532                         if ( mlt_properties_get( properties, "westley" ) == NULL && !strcmp( mlt_service, "tractor" ) )
 533                         {
 534                                 context->pass = 0;
 535                                 serialise_tractor( context, service, node );
 536                                 context->pass = 1;
 537                                 serialise_tractor( context, service, node );
 538                                 context->pass = 0;
 539                                 break;
 540                         }
 541                         else
 542                         {
 543                                 serialise_producer( context, service, node );
 544                         }
 545                         if ( mlt_properties_get( properties, "westley" ) != NULL )
 546                                 break;
 547                 }
 548
 549                 // Tell about the framework container producers
 550                 else if ( strcmp( mlt_type, "mlt_producer" ) == 0 )
 551                 {
 552                         char *resource = mlt_properties_get( properties, "resource" );
 553
 554                         // Recurse on multitrack's tracks
 555                         if ( strcmp( resource, "<multitrack>" ) == 0 )
 556                         {
 557                                 serialise_multitrack( context, service, node );
 558                                 break;
 559                         }
 560
 561                         // Recurse on playlist's clips
 562                         else if ( strcmp( resource, "<playlist>" ) == 0 )
 563                         {
 564                                 serialise_playlist( context, service, node );
 565                         }
 566
 567                         // Recurse on tractor's producer
 568                         else if ( strcmp( resource, "<tractor>" ) == 0 )
 569                         {
 570                                 context->pass = 0;
 571                                 serialise_tractor( context, service, node );
 572                                 context->pass = 1;
 573                                 serialise_tractor( context, service, node );
 574                                 context->pass = 0;
 575                                 break;
 576                         }
 577
 578                         // Treat it as a normal producer
 579                         else
 580                         {
 581                                 serialise_producer( context, service, node );
 582                         }
 583                 }
 584
 585                 // Tell about a filter
 586                 else if ( strcmp( mlt_type, "filter" ) == 0 )
 587                 {
 588                         serialise_filter( context, service, node );
 589                         break;
 590                 }
 591
 592                 // Tell about a transition
 593                 else if ( strcmp( mlt_type, "transition" ) == 0 )
 594                 {
 595                         serialise_transition( context, service, node );
 596                         break;
 597                 }
 598
 599                 // Get the next connected service
 600                 service = mlt_service_producer( service );
 601         }
 602 }
 603
 604 xmlDocPtr westley_make_doc( mlt_consumer consumer, mlt_service service )
 605 {
 606         mlt_properties properties = mlt_service_properties( service );
 607         xmlDocPtr doc = xmlNewDoc( "1.0" );
 608         xmlNodePtr root = xmlNewNode( NULL, "westley" );
 609         struct serialise_context_s *context = calloc( 1, sizeof( struct serialise_context_s ) );
 610
 611         xmlDocSetRootElement( doc, root );
 612
 613         // If we have root, then deal with it now
 614         if ( mlt_properties_get( properties, "root" ) != NULL )
 615         {
 616                 xmlNewProp( root, "root", mlt_properties_get( properties, "root" ) );
 617                 context->root = strdup( mlt_properties_get( properties, "root" ) );
 618         }
 619         else
 620         {
 621                 context->root = strdup( "" );
 622         }
 623
 624         // Assign the additional 'storage' pattern for properties
 625         context->store = mlt_properties_get( mlt_consumer_properties( consumer ), "store" );
 626
 627         // Assign a title property
 628         if ( mlt_properties_get( properties, "title" ) != NULL )
 629                 xmlNewProp( root, "title", mlt_properties_get( properties, "title" ) );
 630
 631         // Construct the context maps
 632         context->id_map = mlt_properties_new();
 633         context->hide_map = mlt_properties_new();
 634
 635         // Ensure producer is a framework producer
 636         mlt_properties_set( mlt_service_properties( service ), "mlt_type", "mlt_producer" );
 637
 638         // In pass one, we serialise the end producers and playlists,
 639         // adding them to a map keyed by address.
 640         serialise_service( context, service, root );
 641
 642         // In pass two, we serialise the tractor and reference the
 643         // producers and playlists
 644         context->pass++;
 645         serialise_service( context, service, root );
 646
 647         // Cleanup resource
 648         mlt_properties_close( context->id_map );
 649         mlt_properties_close( context->hide_map );
 650         free( context->root );
 651         free( context );
 652
 653         return doc;
 654 }
 655
 656 static int consumer_start( mlt_consumer this )
 657 {
 658         xmlDocPtr doc = NULL;
 659
 660         // Get the producer service
 661         mlt_service service = mlt_service_producer( mlt_consumer_service( this ) );
 662         if ( service != NULL )
 663         {
 664                 mlt_properties properties = mlt_consumer_properties( this );
 665                 char *resource =  mlt_properties_get( properties, "resource" );
 666
 667                 // Set the title if provided
 668                 if ( mlt_properties_get( properties, "title" ) )
 669                         mlt_properties_set( mlt_service_properties( service ), "title", mlt_properties_get( properties, "title" ) );
 670                 else if ( mlt_properties_get( mlt_service_properties( service ), "title" ) == NULL )
 671                         mlt_properties_set( mlt_service_properties( service ), "title", "Anonymous Submission" );
 672
 673                 // Check for a root on the consumer properties and pass to service
 674                 if ( mlt_properties_get( properties, "root" ) )
 675                         mlt_properties_set( mlt_service_properties( service ), "root", mlt_properties_get( properties, "root" ) );
 676
 677                 // Specify roots in other cases...
 678                 if ( resource != NULL && mlt_properties_get( properties, "root" ) == NULL )
 679                 {
 680                         // Get the current working directory
 681                         char *cwd = getcwd( NULL, 0 );
 682                         mlt_properties_set( mlt_service_properties( service ), "root", cwd );
 683                         free( cwd );
 684                 }
 685
 686                 // Make the document
 687                 doc = westley_make_doc( this, service );
 688
 689                 // Handle the output
 690                 if ( resource == NULL || !strcmp( resource, "" ) )
 691                 {
 692                         xmlDocFormatDump( stdout, doc, 1 );
 693                 }
 694                 else if ( strchr( resource, '.' ) == NULL )
 695                 {
 696                         xmlChar *buffer = NULL;
 697                         int length = 0;
 698                         xmlDocDumpMemory( doc, &buffer, &length );
 699                         mlt_properties_set( properties, resource, buffer );
 700                         xmlFree( buffer );
 701                 }
 702                 else
 703                 {
 704                         xmlSaveFormatFile( resource, doc, 1 );
 705                 }
 706
 707                 // Close the document
 708                 xmlFreeDoc( doc );
 709         }
 710
 711         mlt_consumer_stop( this );
 712
 713         mlt_consumer_stopped( this );
 714
 715         return 0;
 716 }
 717
 718 static int consumer_is_stopped( mlt_consumer this )
 719 {
 720         return 1;
 721 }