research.m1stereo.tv/gitweb/ - melted/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 };
  46 typedef struct serialise_context_s* serialise_context;
  47
  48 /** Forward references to static functions.
  49 */
  50
  51 static int consumer_start( mlt_consumer parent );
  52 static int consumer_is_stopped( mlt_consumer this );
  53 static void serialise_service( serialise_context context, mlt_service service, xmlNode *node );
  54
  55 typedef enum
  56 {
  57         westley_existing,
  58         westley_producer,
  59         westley_multitrack,
  60         westley_playlist,
  61         westley_tractor,
  62         westley_filter,
  63         westley_transition
  64 }
  65 westley_type;
  66
  67 /** Create or retrieve an id associated to this service.
  68 */
  69
  70 static char *westley_get_id( serialise_context context, mlt_service service, westley_type type )
  71 {
  72         char *id = NULL;
  73         int i = 0;
  74         mlt_properties map = context->id_map;
  75
  76         // Search the map for the service
  77         for ( i = 0; i < mlt_properties_count( map ); i ++ )
  78                 if ( mlt_properties_get_data_at( map, i, NULL ) == service )
  79                         break;
  80
  81         // If the service is not in the map, and the type indicates a new id is needed...
  82         if ( i >= mlt_properties_count( map ) && type != westley_existing )
  83         {
  84                 // Attempt to reuse existing id
  85                 id = mlt_properties_get( mlt_service_properties( service ), "id" );
  86
  87                 // If no id, or the id is used in the map (for another service), then
  88                 // create a new one.
  89                 if ( id == NULL || mlt_properties_get_data( map, id, NULL ) != NULL )
  90                 {
  91                         char temp[ ID_SIZE ];
  92                         do
  93                         {
  94                                 switch( type )
  95                                 {
  96                                         case westley_producer:
  97                                                 sprintf( temp, "producer%d", context->producer_count ++ );
  98                                                 break;
  99                                         case westley_multitrack:
 100                                                 sprintf( temp, "multitrack%d", context->multitrack_count ++ );
 101                                                 break;
 102                                         case westley_playlist:
 103                                                 sprintf( temp, "playlist%d", context->playlist_count ++ );
 104                                                 break;
 105                                         case westley_tractor:
 106                                                 sprintf( temp, "tractor%d", context->tractor_count ++ );
 107                                                 break;
 108                                         case westley_filter:
 109                                                 sprintf( temp, "filter%d", context->filter_count ++ );
 110                                                 break;
 111                                         case westley_transition:
 112                                                 sprintf( temp, "transition%d", context->transition_count ++ );
 113                                                 break;
 114                                         case westley_existing:
 115                                                 // Never gets here
 116                                                 break;
 117                                 }
 118                         }
 119                         while( mlt_properties_get_data( map, temp, NULL ) != NULL );
 120
 121                         // Set the data at the generated name
 122                         mlt_properties_set_data( map, temp, service, 0, NULL, NULL );
 123
 124                         // Get the pointer to the name (i is the end of the list)
 125                         id = mlt_properties_get_name( map, i );
 126                 }
 127                 else
 128                 {
 129                         // Store the existing id in the map
 130                         mlt_properties_set_data( map, id, service, 0, NULL, NULL );
 131                 }
 132         }
 133         else if ( type == westley_existing )
 134         {
 135                 id = mlt_properties_get_name( map, i );
 136         }
 137
 138         return id;
 139 }
 140
 141 /** This is what will be called by the factory - anything can be passed in
 142         via the argument, but keep it simple.
 143 */
 144
 145 mlt_consumer consumer_westley_init( char *arg )
 146 {
 147         // Create the consumer object
 148         mlt_consumer this = calloc( sizeof( struct mlt_consumer_s ), 1 );
 149
 150         // If no malloc'd and consumer init ok
 151         if ( this != NULL && mlt_consumer_init( this, NULL ) == 0 )
 152         {
 153                 // Allow thread to be started/stopped
 154                 this->start = consumer_start;
 155                 this->is_stopped = consumer_is_stopped;
 156
 157                 mlt_properties_set( mlt_consumer_properties( this ), "resource", arg );
 158
 159                 // Return the consumer produced
 160                 return this;
 161         }
 162
 163         // malloc or consumer init failed
 164         free( this );
 165
 166         // Indicate failure
 167         return NULL;
 168 }
 169
 170 static inline void serialise_properties( serialise_context context, mlt_properties properties, xmlNode *node )
 171 {
 172         int i;
 173         xmlNode *p;
 174
 175         // Enumerate the properties
 176         for ( i = 0; i < mlt_properties_count( properties ); i++ )
 177         {
 178                 char *name = mlt_properties_get_name( properties, i );
 179                 if ( name != NULL &&
 180                          name[ 0 ] != '_' &&
 181                          mlt_properties_get_value( properties, i ) != NULL &&
 182                          strcmp( name, "westley" ) != 0 &&
 183                          strcmp( name, "in" ) != 0 &&
 184                          strcmp( name, "out" ) != 0 &&
 185                          strcmp( name, "id" ) != 0 &&
 186                          strcmp( name, "root" ) != 0 &&
 187                          strcmp( name, "width" ) != 0 &&
 188                          strcmp( name, "height" ) != 0 )
 189                 {
 190                         char *value = mlt_properties_get_value( properties, i );
 191                         p = xmlNewChild( node, NULL, "property", NULL );
 192                         xmlNewProp( p, "name", mlt_properties_get_name( properties, i ) );
 193                         if ( strcmp( context->root, "" ) && !strncmp( value, context->root, strlen( context->root ) ) )
 194                                 xmlNodeSetContent( p, value + strlen( context->root ) + 1 );
 195                         else
 196                                 xmlNodeSetContent( p, value );
 197                 }
 198         }
 199 }
 200
 201 static inline void serialise_service_filters( serialise_context context, mlt_service service, xmlNode *node )
 202 {
 203         int i;
 204         xmlNode *p;
 205         mlt_filter filter = NULL;
 206
 207         // Enumerate the filters
 208         for ( i = 0; ( filter = mlt_producer_filter( MLT_PRODUCER( service ), i ) ) != NULL; i ++ )
 209         {
 210                 mlt_properties properties = mlt_filter_properties( filter );
 211                 if ( mlt_properties_get_int( properties, "_fezzik" ) == 0 )
 212                 {
 213                         // Get a new id - if already allocated, do nothing
 214                         char *id = westley_get_id( context, mlt_filter_service( filter ), westley_filter );
 215                         if ( id != NULL )
 216                         {
 217                                 int in = mlt_properties_get_position( properties, "in" );
 218                                 int out = mlt_properties_get_position( properties, "out" );
 219                                 p = xmlNewChild( node, NULL, "filter", NULL );
 220                                 xmlNewProp( p, "id", id );
 221                                 if ( in != 0 || out != 0 )
 222                                 {
 223                                         char temp[ 20 ];
 224                                         sprintf( temp, "%d", in );
 225                                         xmlNewProp( p, "in", temp );
 226                                         sprintf( temp, "%d", out );
 227                                         xmlNewProp( p, "out", temp );
 228                                 }
 229                                 serialise_properties( context, properties, p );
 230                                 serialise_service_filters( context, mlt_filter_service( filter ), p );
 231                         }
 232                 }
 233         }
 234 }
 235
 236 static void serialise_producer( serialise_context context, mlt_service service, xmlNode *node )
 237 {
 238         xmlNode *child = node;
 239         mlt_properties properties = mlt_service_properties( service );
 240
 241         if ( context->pass == 0 )
 242         {
 243                 // Get a new id - if already allocated, do nothing
 244                 char *id = westley_get_id( context, service, westley_producer );
 245                 if ( id == NULL )
 246                         return;
 247
 248                 child = xmlNewChild( node, NULL, "producer", NULL );
 249
 250                 // Set the id
 251                 xmlNewProp( child, "id", id );
 252                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 253                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 254                 serialise_properties( context, properties, child );
 255                 serialise_service_filters( context, service, child );
 256
 257                 // Add producer to the map
 258                 mlt_properties_set_int( context->hide_map, id, mlt_properties_get_int( properties, "hide" ) );
 259         }
 260         else
 261         {
 262                 // Get a new id - if already allocated, do nothing
 263                 char *id = westley_get_id( context, service, westley_existing );
 264                 xmlNewProp( node, "producer", id );
 265         }
 266 }
 267
 268 static void serialise_multitrack( serialise_context context, mlt_service service, xmlNode *node )
 269 {
 270         int i;
 271
 272         if ( context->pass == 0 )
 273         {
 274                 // Iterate over the tracks to collect the producers
 275                 for ( i = 0; i < mlt_multitrack_count( MLT_MULTITRACK( service ) ); i++ )
 276                         serialise_service( context, MLT_SERVICE( mlt_multitrack_track( MLT_MULTITRACK( service ), i ) ), node );
 277         }
 278         else
 279         {
 280                 // Get a new id - if already allocated, do nothing
 281                 char *id = westley_get_id( context, service, westley_multitrack );
 282                 if ( id == NULL )
 283                         return;
 284
 285                 // Serialise the tracks
 286                 for ( i = 0; i < mlt_multitrack_count( MLT_MULTITRACK( service ) ); i++ )
 287                 {
 288                         xmlNode *track = xmlNewChild( node, NULL, "track", NULL );
 289                         int hide = 0;
 290                         mlt_producer producer = mlt_multitrack_track( MLT_MULTITRACK( service ), i );
 291
 292                         char *id = westley_get_id( context, MLT_SERVICE( producer ), westley_existing );
 293                         xmlNewProp( track, "producer", id );
 294
 295                         hide = mlt_properties_get_int( context->hide_map, id );
 296                         if ( hide )
 297                                 xmlNewProp( track, "hide", hide == 1 ? "video" : ( hide == 2 ? "audio" : "both" ) );
 298                 }
 299                 serialise_service_filters( context, service, node );
 300         }
 301 }
 302
 303 static void serialise_tractor( serialise_context context, mlt_service service, xmlNode *node );
 304
 305 static void serialise_playlist( serialise_context context, mlt_service service, xmlNode *node )
 306 {
 307         int i;
 308         xmlNode *child = node;
 309         mlt_playlist_clip_info info;
 310         mlt_properties properties = mlt_service_properties( service );
 311
 312         if ( context->pass == 0 )
 313         {
 314                 // Get a new id - if already allocated, do nothing
 315                 char *id = westley_get_id( context, service, westley_playlist );
 316                 if ( id == NULL )
 317                         return;
 318
 319                 // Iterate over the playlist entries to collect the producers
 320                 for ( i = 0; i < mlt_playlist_count( MLT_PLAYLIST( service ) ); i++ )
 321                 {
 322                         if ( ! mlt_playlist_get_clip_info( MLT_PLAYLIST( service ), &info, i ) )
 323                         {
 324                                 if ( info.producer != NULL )
 325                                 {
 326                                         char *service_s = mlt_properties_get( mlt_producer_properties( info.producer ), "mlt_service" );
 327                                         char *resource_s = mlt_properties_get( mlt_producer_properties( info.producer ), "resource" );
 328                                         if ( resource_s != NULL && !strcmp( resource_s, "<tractor>" ) )
 329                                         {
 330                                                 serialise_tractor( context, MLT_SERVICE( info.producer ), node );
 331                                                 context->pass ++;
 332                                                 serialise_tractor( context, MLT_SERVICE( info.producer ), node );
 333                                                 context->pass --;
 334                                         }
 335                                         else if ( service_s != NULL && strcmp( service_s, "blank" ) != 0 )
 336                                                 serialise_service( context, MLT_SERVICE( info.producer ), node );
 337                                         else if ( resource_s != NULL && !strcmp( resource_s, "<playlist>" ) )
 338                                                 serialise_playlist( context, MLT_SERVICE( info.producer ), node );
 339                                 }
 340                         }
 341                 }
 342
 343                 child = xmlNewChild( node, NULL, "playlist", NULL );
 344
 345                 // Set the id
 346                 xmlNewProp( child, "id", id );
 347
 348                 // Add producer to the map
 349                 mlt_properties_set_int( context->hide_map, id, mlt_properties_get_int( properties, "hide" ) );
 350
 351                 // Iterate over the playlist entries
 352                 for ( i = 0; i < mlt_playlist_count( MLT_PLAYLIST( service ) ); i++ )
 353                 {
 354                         if ( ! mlt_playlist_get_clip_info( MLT_PLAYLIST( service ), &info, i ) )
 355                         {
 356                                 char *service_s = mlt_properties_get( mlt_producer_properties( info.producer ), "mlt_service" );
 357                                 if ( service_s != NULL && strcmp( service_s, "blank" ) == 0 )
 358                                 {
 359                                         char length[ 20 ];
 360                                         length[ 19 ] = '\0';
 361                                         xmlNode *entry = xmlNewChild( child, NULL, "blank", NULL );
 362                                         snprintf( length, 19, "%d", info.frame_count );
 363                                         xmlNewProp( entry, "length", length );
 364                                 }
 365                                 else
 366                                 {
 367                                         char temp[ 20 ];
 368                                         xmlNode *entry = xmlNewChild( child, NULL, "entry", NULL );
 369                                         id = westley_get_id( context, MLT_SERVICE( info.producer ), westley_existing );
 370                                         xmlNewProp( entry, "producer", id );
 371                                         sprintf( temp, "%d", info.frame_in );
 372                                         xmlNewProp( entry, "in", temp );
 373                                         sprintf( temp, "%d", info.frame_out );
 374                                         xmlNewProp( entry, "out", temp );
 375                                 }
 376                         }
 377                 }
 378
 379                 serialise_service_filters( context, service, child );
 380         }
 381         else if ( strcmp( (const char*) node->name, "tractor" ) != 0 )
 382         {
 383                 char *id = westley_get_id( context, service, westley_existing );
 384                 xmlNewProp( node, "producer", id );
 385         }
 386 }
 387
 388 static void serialise_tractor( serialise_context context, mlt_service service, xmlNode *node )
 389 {
 390         xmlNode *child = node;
 391         mlt_properties properties = mlt_service_properties( service );
 392
 393         if ( context->pass == 0 )
 394         {
 395                 // Recurse on connected producer
 396                 serialise_service( context, mlt_service_producer( service ), node );
 397         }
 398         else
 399         {
 400                 // Get a new id - if already allocated, do nothing
 401                 char *id = westley_get_id( context, service, westley_tractor );
 402                 if ( id == NULL )
 403                         return;
 404
 405                 child = xmlNewChild( node, NULL, "tractor", NULL );
 406
 407                 // Set the id
 408                 xmlNewProp( child, "id", id );
 409                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 410                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 411
 412                 // Recurse on connected producer
 413                 serialise_service( context, mlt_service_producer( service ), child );
 414                 serialise_service_filters( context, service, child );
 415         }
 416 }
 417
 418 static void serialise_filter( serialise_context context, mlt_service service, xmlNode *node )
 419 {
 420         xmlNode *child = node;
 421         mlt_properties properties = mlt_service_properties( service );
 422
 423         // Recurse on connected producer
 424         serialise_service( context, mlt_service_producer( service ), node );
 425
 426         if ( context->pass == 1 )
 427         {
 428                 // Get a new id - if already allocated, do nothing
 429                 char *id = westley_get_id( context, service, westley_filter );
 430                 if ( id == NULL )
 431                         return;
 432
 433                 child = xmlNewChild( node, NULL, "filter", NULL );
 434
 435                 // Set the id
 436                 xmlNewProp( child, "id", id );
 437                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 438                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 439
 440                 serialise_properties( context, properties, child );
 441                 serialise_service_filters( context, service, child );
 442         }
 443 }
 444
 445 static void serialise_transition( serialise_context context, mlt_service service, xmlNode *node )
 446 {
 447         xmlNode *child = node;
 448         mlt_properties properties = mlt_service_properties( service );
 449
 450         // Recurse on connected producer
 451         serialise_service( context, MLT_SERVICE( MLT_TRANSITION( service )->producer ), node );
 452
 453         if ( context->pass == 1 )
 454         {
 455                 // Get a new id - if already allocated, do nothing
 456                 char *id = westley_get_id( context, service, westley_transition );
 457                 if ( id == NULL )
 458                         return;
 459
 460                 child = xmlNewChild( node, NULL, "transition", NULL );
 461
 462                 // Set the id
 463                 xmlNewProp( child, "id", id );
 464                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 465                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 466
 467                 serialise_properties( context, properties, child );
 468                 serialise_service_filters( context, service, child );
 469         }
 470 }
 471
 472 static void serialise_service( serialise_context context, mlt_service service, xmlNode *node )
 473 {
 474         // Iterate over consumer/producer connections
 475         while ( service != NULL )
 476         {
 477                 mlt_properties properties = mlt_service_properties( service );
 478                 char *mlt_type = mlt_properties_get( properties, "mlt_type" );
 479
 480                 // Tell about the producer
 481                 if ( strcmp( mlt_type, "producer" ) == 0 )
 482                 {
 483                         serialise_producer( context, service, node );
 484                         if ( mlt_properties_get( properties, "westley" ) != NULL )
 485                                 break;
 486                 }
 487
 488                 // Tell about the framework container producers
 489                 else if ( strcmp( mlt_type, "mlt_producer" ) == 0 )
 490                 {
 491                         char *resource = mlt_properties_get( properties, "resource" );
 492
 493                         // Recurse on multitrack's tracks
 494                         if ( strcmp( resource, "<multitrack>" ) == 0 )
 495                         {
 496                                 serialise_multitrack( context, service, node );
 497                                 break;
 498                         }
 499
 500                         // Recurse on playlist's clips
 501                         else if ( strcmp( resource, "<playlist>" ) == 0 )
 502                         {
 503                                 serialise_playlist( context, service, node );
 504                         }
 505
 506                         // Recurse on tractor's producer
 507                         else if ( strcmp( resource, "<tractor>" ) == 0 )
 508                         {
 509                                 serialise_tractor( context, service, node );
 510                                 break;
 511                         }
 512
 513                         // Treat it as a normal producer
 514                         else
 515                         {
 516                                 serialise_producer( context, service, node );
 517                         }
 518                 }
 519
 520                 // Tell about a filter
 521                 else if ( strcmp( mlt_type, "filter" ) == 0 )
 522                 {
 523                         serialise_filter( context, service, node );
 524                         break;
 525                 }
 526
 527                 // Tell about a transition
 528                 else if ( strcmp( mlt_type, "transition" ) == 0 )
 529                 {
 530                         serialise_transition( context, service, node );
 531                         break;
 532                 }
 533
 534                 // Get the next connected service
 535                 service = mlt_service_producer( service );
 536         }
 537 }
 538
 539 xmlDocPtr westley_make_doc( mlt_service service )
 540 {
 541         mlt_properties properties = mlt_service_properties( service );
 542         xmlDocPtr doc = xmlNewDoc( "1.0" );
 543         xmlNodePtr root = xmlNewNode( NULL, "westley" );
 544         struct serialise_context_s *context = calloc( 1, sizeof( struct serialise_context_s ) );
 545
 546         xmlDocSetRootElement( doc, root );
 547
 548         // If we have root, then deal with it now
 549         if ( mlt_properties_get( properties, "root" ) != NULL )
 550         {
 551                 xmlNewProp( root, "root", mlt_properties_get( properties, "root" ) );
 552                 context->root = strdup( mlt_properties_get( properties, "root" ) );
 553         }
 554         else
 555         {
 556                 context->root = strdup( "" );
 557         }
 558
 559         // Assign a title property
 560         if ( mlt_properties_get( properties, "title" ) != NULL )
 561                 xmlNewProp( root, "title", mlt_properties_get( properties, "title" ) );
 562
 563         // Construct the context maps
 564         context->id_map = mlt_properties_new();
 565         context->hide_map = mlt_properties_new();
 566
 567         // Ensure producer is a framework producer
 568         mlt_properties_set( mlt_service_properties( service ), "mlt_type", "mlt_producer" );
 569
 570         // In pass one, we serialise the end producers and playlists,
 571         // adding them to a map keyed by address.
 572         serialise_service( context, service, root );
 573
 574         // In pass two, we serialise the tractor and reference the
 575         // producers and playlists
 576         context->pass++;
 577         serialise_service( context, service, root );
 578
 579         // Cleanup resource
 580         mlt_properties_close( context->id_map );
 581         mlt_properties_close( context->hide_map );
 582         free( context->root );
 583         free( context );
 584
 585         return doc;
 586 }
 587
 588 static int consumer_start( mlt_consumer this )
 589 {
 590         xmlDocPtr doc = NULL;
 591
 592         // Get the producer service
 593         mlt_service service = mlt_service_producer( mlt_consumer_service( this ) );
 594         if ( service != NULL )
 595         {
 596                 mlt_properties properties = mlt_consumer_properties( this );
 597                 char *resource =  mlt_properties_get( properties, "resource" );
 598
 599                 // Set the title if provided
 600                 if ( mlt_properties_get( properties, "title" ) )
 601                         mlt_properties_set( mlt_service_properties( service ), "title", mlt_properties_get( properties, "title" ) );
 602                 else if ( mlt_properties_get( mlt_service_properties( service ), "title" ) == NULL )
 603                         mlt_properties_set( mlt_service_properties( service ), "title", "Anonymous Submission" );
 604
 605                 // Check for a root on the consumer properties and pass to service
 606                 if ( mlt_properties_get( properties, "root" ) )
 607                         mlt_properties_set( mlt_service_properties( service ), "root", mlt_properties_get( properties, "root" ) );
 608
 609                 // Specify roots in other cases...
 610                 if ( resource != NULL && mlt_properties_get( properties, "root" ) == NULL )
 611                 {
 612                         // Get the current working directory
 613                         char *cwd = getcwd( NULL, 0 );
 614                         mlt_properties_set( mlt_service_properties( service ), "root", cwd );
 615                         free( cwd );
 616                 }
 617
 618                 // Make the document
 619                 doc = westley_make_doc( service );
 620
 621                 // Handle the output
 622                 if ( resource == NULL || !strcmp( resource, "" ) )
 623                 {
 624                         xmlDocFormatDump( stdout, doc, 1 );
 625                 }
 626                 else if ( !strcmp( resource, "buffer" ) )
 627                 {
 628                         xmlChar *buffer = NULL;
 629                         int length = 0;
 630                         xmlDocDumpMemory( doc, &buffer, &length );
 631                         mlt_properties_set_data( properties, "buffer", buffer, length, xmlFree, NULL );
 632                 }
 633                 else
 634                 {
 635                         xmlSaveFormatFile( resource, doc, 1 );
 636                 }
 637
 638                 // Close the document
 639                 xmlFreeDoc( doc );
 640         }
 641
 642         mlt_consumer_stop( this );
 643
 644         mlt_consumer_stopped( this );
 645
 646         return 0;
 647 }
 648
 649 static int consumer_is_stopped( mlt_consumer this )
 650 {
 651         return 1;
 652 }