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 <libxml/tree.h>
  28
  29 #define ID_SIZE 128
  30
  31 // This maintains counters for adding ids to elements
  32 struct serialise_context_s
  33 {
  34         int producer_count;
  35         int multitrack_count;
  36         int playlist_count;
  37         int tractor_count;
  38         int filter_count;
  39         int transition_count;
  40         int pass;
  41         mlt_properties producer_map;
  42         mlt_properties hide_map;
  43 };
  44 typedef struct serialise_context_s* serialise_context;
  45
  46 /** Forward references to static functions.
  47 */
  48
  49 static int consumer_start( mlt_consumer parent );
  50 static int consumer_is_stopped( mlt_consumer this );
  51 static void serialise_service( serialise_context context, mlt_service service, xmlNode *node );
  52
  53 /** This is what will be called by the factory - anything can be passed in
  54         via the argument, but keep it simple.
  55 */
  56
  57 mlt_consumer consumer_westley_init( char *arg )
  58 {
  59         // Create the consumer object
  60         mlt_consumer this = calloc( sizeof( struct mlt_consumer_s ), 1 );
  61
  62         // If no malloc'd and consumer init ok
  63         if ( this != NULL && mlt_consumer_init( this, NULL ) == 0 )
  64         {
  65                 // Allow thread to be started/stopped
  66                 this->start = consumer_start;
  67                 this->is_stopped = consumer_is_stopped;
  68
  69                 mlt_properties_set( mlt_consumer_properties( this ), "resource", arg );
  70
  71                 // Return the consumer produced
  72                 return this;
  73         }
  74
  75         // malloc or consumer init failed
  76         free( this );
  77
  78         // Indicate failure
  79         return NULL;
  80 }
  81
  82 static inline void serialise_properties( mlt_properties properties, xmlNode *node )
  83 {
  84         int i;
  85         xmlNode *p;
  86
  87         // Enumerate the properties
  88         for ( i = 0; i < mlt_properties_count( properties ); i++ )
  89         {
  90                 char *name = mlt_properties_get_name( properties, i );
  91                 if ( name != NULL &&
  92                          name[ 0 ] != '_' &&
  93                          mlt_properties_get_value( properties, i ) != NULL &&
  94                          strcmp( name, "westley" ) != 0 &&
  95                          strcmp( name, "in" ) != 0 &&
  96                          strcmp( name, "out" ) != 0 )
  97                 {
  98                         p = xmlNewChild( node, NULL, "property", NULL );
  99                         xmlNewProp( p, "name", mlt_properties_get_name( properties, i ) );
 100                         xmlNodeSetContent( p, mlt_properties_get_value( properties, i ) );
 101                 }
 102         }
 103 }
 104
 105 static void serialise_producer( serialise_context context, mlt_service service, xmlNode *node )
 106 {
 107         xmlNode *child = node;
 108         char id[ ID_SIZE + 1 ];
 109         char key[ 11 ];
 110         mlt_properties properties = mlt_service_properties( service );
 111
 112         id[ ID_SIZE ] = '\0';
 113         key[ 10 ] = '\0';
 114
 115         if ( context->pass == 0 )
 116         {
 117                 child = xmlNewChild( node, NULL, "producer", NULL );
 118
 119                 // Set the id
 120                 if ( mlt_properties_get( properties, "id" ) == NULL )
 121                 {
 122                         snprintf( id, ID_SIZE, "producer%d", context->producer_count++ );
 123                         xmlNewProp( child, "id", id );
 124                 }
 125                 else
 126                         strncpy( id, mlt_properties_get( properties, "id" ), ID_SIZE );
 127                 serialise_properties( properties, child );
 128
 129                 // Add producer to the map
 130                 snprintf( key, 10, "%p", service );
 131                 mlt_properties_set( context->producer_map, key, id );
 132                 mlt_properties_set_int( context->hide_map, key, mlt_properties_get_int( properties, "hide" ) );
 133         }
 134         else
 135         {
 136                 snprintf( key, 10, "%p", service );
 137                 xmlNewProp( node, "producer", mlt_properties_get( context->producer_map, key ) );
 138         }
 139 }
 140
 141 static void serialise_multitrack( serialise_context context, mlt_service service, xmlNode *node )
 142 {
 143         int i;
 144         xmlNode *child = node;
 145         char id[ ID_SIZE + 1 ];
 146         char key[ 11 ];
 147         mlt_properties properties = mlt_service_properties( service );
 148
 149         id[ ID_SIZE ] = '\0';
 150         key[ 10 ] = '\0';
 151
 152         if ( context->pass == 0 )
 153         {
 154                 // Iterate over the tracks to collect the producers
 155                 for ( i = 0; i < mlt_multitrack_count( MLT_MULTITRACK( service ) ); i++ )
 156                         serialise_service( context, MLT_SERVICE( mlt_multitrack_track( MLT_MULTITRACK( service ), i ) ), node );
 157         }
 158         else
 159         {
 160                 // Create the multitrack node
 161                 child = xmlNewChild( node, NULL, "multitrack", NULL );
 162
 163                 // Set the id
 164                 if ( mlt_properties_get( properties, "id" ) == NULL )
 165                 {
 166                         snprintf( id, ID_SIZE, "multitrack%d", context->multitrack_count++ );
 167                         xmlNewProp( child, "id", id );
 168                 }
 169
 170                 // Serialise the tracks
 171                 for ( i = 0; i < mlt_multitrack_count( MLT_MULTITRACK( service ) ); i++ )
 172                 {
 173                         xmlNode *track = xmlNewChild( child, NULL, "track", NULL );
 174                         int hide = 0;
 175
 176                         snprintf( key, 10, "%p", MLT_SERVICE( mlt_multitrack_track( MLT_MULTITRACK( service ), i ) ) );
 177                         xmlNewProp( track, "producer", mlt_properties_get( context->producer_map, key ) );
 178
 179                         hide = mlt_properties_get_int( context->hide_map, key );
 180                         if ( hide )
 181                                 xmlNewProp( track, "hide", hide == 1 ? "video" : ( hide == 2 ? "audio" : "both" ) );
 182                 }
 183         }
 184 }
 185
 186 static void serialise_playlist( serialise_context context, mlt_service service, xmlNode *node )
 187 {
 188         int i;
 189         xmlNode *child = node;
 190         char id[ ID_SIZE + 1 ];
 191         char key[ 11 ];
 192         mlt_playlist_clip_info info;
 193         mlt_properties properties = mlt_service_properties( service );
 194
 195         id[ ID_SIZE ] = '\0';
 196         key[ 10 ] = '\0';
 197
 198         if ( context->pass == 0 )
 199         {
 200                 // Iterate over the playlist entries to collect the producers
 201                 for ( i = 0; i < mlt_playlist_count( MLT_PLAYLIST( service ) ); i++ )
 202                 {
 203                         if ( ! mlt_playlist_get_clip_info( MLT_PLAYLIST( service ), &info, i ) )
 204                         {
 205                                 if ( info.producer != NULL )
 206                                 {
 207                                         char *service_s = mlt_properties_get( mlt_producer_properties( info.producer ), "mlt_service" );
 208                                         char *resource_s = mlt_properties_get( mlt_producer_properties( info.producer ), "resource" );
 209                                         if ( service_s != NULL && strcmp( service_s, "blank" ) != 0 )
 210                                                 serialise_service( context, MLT_SERVICE( info.producer ), node );
 211                                         else if ( resource_s != NULL && !strcmp( resource_s, "<playlist>" ) )
 212                                                 serialise_playlist( context, MLT_SERVICE( info.producer ), node );
 213                                 }
 214                         }
 215                 }
 216
 217                 child = xmlNewChild( node, NULL, "playlist", NULL );
 218
 219                 // Set the id
 220                 if ( mlt_properties_get( properties, "id" ) == NULL )
 221                 {
 222                         snprintf( id, ID_SIZE, "playlist%d", context->playlist_count++ );
 223                         xmlNewProp( child, "id", id );
 224                 }
 225                 else
 226                         strncpy( id, mlt_properties_get( properties, "id" ), ID_SIZE );
 227
 228                 // Add producer to the map
 229                 snprintf( key, 10, "%p", service );
 230                 mlt_properties_set( context->producer_map, key, id );
 231                 mlt_properties_set_int( context->hide_map, key, mlt_properties_get_int( properties, "hide" ) );
 232
 233                 // Iterate over the playlist entries
 234                 for ( i = 0; i < mlt_playlist_count( MLT_PLAYLIST( service ) ); i++ )
 235                 {
 236                         if ( ! mlt_playlist_get_clip_info( MLT_PLAYLIST( service ), &info, i ) )
 237                         {
 238                                 char *service_s = mlt_properties_get( mlt_producer_properties( info.producer ), "mlt_service" );
 239                                 if ( service_s != NULL && strcmp( service_s, "blank" ) == 0 )
 240                                 {
 241                                         char length[ 20 ];
 242                                         length[ 19 ] = '\0';
 243                                         xmlNode *entry = xmlNewChild( child, NULL, "blank", NULL );
 244                                         snprintf( length, 19, "%d", info.frame_count );
 245                                         xmlNewProp( entry, "length", length );
 246                                 }
 247                                 else
 248                                 {
 249                                         char temp[ 20 ];
 250                                         xmlNode *entry = xmlNewChild( child, NULL, "entry", NULL );
 251                                         snprintf( key, 10, "%p", MLT_SERVICE( info.producer ) );
 252                                         xmlNewProp( entry, "producer", mlt_properties_get( context->producer_map, key ) );
 253                                         sprintf( temp, "%d", info.frame_in );
 254                                         xmlNewProp( entry, "in", temp );
 255                                         sprintf( temp, "%d", info.frame_out );
 256                                         xmlNewProp( entry, "out", temp );
 257                                 }
 258                         }
 259                 }
 260         }
 261         else if ( strcmp( (const char*) node->name, "tractor" ) != 0 )
 262         {
 263                 snprintf( key, 10, "%p", service );
 264                 xmlNewProp( node, "producer", mlt_properties_get( context->producer_map, key ) );
 265         }
 266 }
 267
 268 static void serialise_tractor( serialise_context context, mlt_service service, xmlNode *node )
 269 {
 270         xmlNode *child = node;
 271         char id[ ID_SIZE + 1 ];
 272         mlt_properties properties = mlt_service_properties( service );
 273
 274         id[ ID_SIZE ] = '\0';
 275
 276         if ( context->pass == 0 )
 277         {
 278                 // Recurse on connected producer
 279                 serialise_service( context, mlt_service_producer( service ), node );
 280         }
 281         else
 282         {
 283                 child = xmlNewChild( node, NULL, "tractor", NULL );
 284
 285                 // Set the id
 286                 if ( mlt_properties_get( properties, "id" ) == NULL )
 287                 {
 288                         snprintf( id, ID_SIZE, "tractor%d", context->tractor_count++ );
 289                         xmlNewProp( child, "id", id );
 290                 }
 291
 292                 xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 293                 xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 294
 295                 // Recurse on connected producer
 296                 serialise_service( context, mlt_service_producer( service ), child );
 297         }
 298 }
 299
 300 static void serialise_filter( serialise_context context, mlt_service service, xmlNode *node )
 301 {
 302         xmlNode *child = node;
 303         char id[ ID_SIZE + 1 ];
 304         mlt_properties properties = mlt_service_properties( service );
 305
 306         id[ ID_SIZE ] = '\0';
 307
 308         // Recurse on connected producer
 309         serialise_service( context, mlt_service_producer( service ), node );
 310
 311         if ( context->pass == 1 )
 312         {
 313                 child = xmlNewChild( node, NULL, "filter", NULL );
 314
 315                 // Set the id
 316                 if ( mlt_properties_get( properties, "id" ) == NULL )
 317                 {
 318                         snprintf( id, ID_SIZE, "filter%d", context->filter_count++ );
 319                         xmlNewProp( child, "id", id );
 320                         xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 321                         xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 322                 }
 323
 324                 serialise_properties( properties, child );
 325         }
 326 }
 327
 328 static void serialise_transition( serialise_context context, mlt_service service, xmlNode *node )
 329 {
 330         xmlNode *child = node;
 331         char id[ ID_SIZE + 1 ];
 332         mlt_properties properties = mlt_service_properties( service );
 333
 334         id[ ID_SIZE ] = '\0';
 335
 336         // Recurse on connected producer
 337         serialise_service( context, MLT_SERVICE( MLT_TRANSITION( service )->producer ), node );
 338
 339         if ( context->pass == 1 )
 340         {
 341                 child = xmlNewChild( node, NULL, "transition", NULL );
 342
 343                 // Set the id
 344                 if ( mlt_properties_get( properties, "id" ) == NULL )
 345                 {
 346                         snprintf( id, ID_SIZE, "transition%d", context->transition_count++ );
 347                         xmlNewProp( child, "id", id );
 348                         xmlNewProp( child, "in", mlt_properties_get( properties, "in" ) );
 349                         xmlNewProp( child, "out", mlt_properties_get( properties, "out" ) );
 350                 }
 351
 352                 serialise_properties( properties, child );
 353         }
 354 }
 355
 356 static void serialise_service( serialise_context context, mlt_service service, xmlNode *node )
 357 {
 358         // Iterate over consumer/producer connections
 359         while ( service != NULL )
 360         {
 361                 mlt_properties properties = mlt_service_properties( service );
 362                 char *mlt_type = mlt_properties_get( properties, "mlt_type" );
 363
 364                 // Tell about the producer
 365                 if ( strcmp( mlt_type, "producer" ) == 0 )
 366                 {
 367                         serialise_producer( context, service, node );
 368                         if ( mlt_properties_get( properties, "westley" ) != NULL )
 369                                 break;
 370                 }
 371
 372                 // Tell about the framework container producers
 373                 else if ( strcmp( mlt_type, "mlt_producer" ) == 0 )
 374                 {
 375                         char *resource = mlt_properties_get( properties, "resource" );
 376
 377                         // Recurse on multitrack's tracks
 378                         if ( strcmp( resource, "<multitrack>" ) == 0 )
 379                         {
 380                                 serialise_multitrack( context, service, node );
 381                                 break;
 382                         }
 383
 384                         // Recurse on playlist's clips
 385                         else if ( strcmp( resource, "<playlist>" ) == 0 )
 386                         {
 387                                 serialise_playlist( context, service, node );
 388                         }
 389
 390                         // Recurse on tractor's producer
 391                         else if ( strcmp( resource, "<tractor>" ) == 0 )
 392                         {
 393                                 serialise_tractor( context, service, node );
 394                                 break;
 395                         }
 396                 }
 397
 398                 // Tell about a filter
 399                 else if ( strcmp( mlt_type, "filter" ) == 0 )
 400                 {
 401                         serialise_filter( context, service, node );
 402                         break;
 403                 }
 404
 405                 // Tell about a transition
 406                 else if ( strcmp( mlt_type, "transition" ) == 0 )
 407                 {
 408                         serialise_transition( context, service, node );
 409                         break;
 410                 }
 411
 412                 // Get the next connected service
 413                 service = mlt_service_producer( service );
 414         }
 415 }
 416
 417 xmlDocPtr westley_make_doc( mlt_service service )
 418 {
 419         xmlDocPtr doc = xmlNewDoc( "1.0" );
 420         xmlNodePtr root = xmlNewNode( NULL, "westley" );
 421         struct serialise_context_s *context = calloc( 1, sizeof( struct serialise_context_s ) );
 422
 423         xmlDocSetRootElement( doc, root );
 424
 425         // Construct the context maps
 426         context->producer_map = mlt_properties_new();
 427         context->hide_map = mlt_properties_new();
 428
 429         // Ensure producer is a framework producer
 430         mlt_properties_set( mlt_service_properties( service ), "mlt_type", "mlt_producer" );
 431
 432         // In pass one, we serialise the end producers and playlists,
 433         // adding them to a map keyed by address.
 434         serialise_service( context, service, root );
 435
 436         // In pass two, we serialise the tractor and reference the
 437         // producers and playlists
 438         context->pass++;
 439         serialise_service( context, service, root );
 440
 441         // Cleanup resource
 442         mlt_properties_close( context->producer_map );
 443         mlt_properties_close( context->hide_map );
 444         free( context );
 445
 446         return doc;
 447 }
 448
 449
 450 static int consumer_start( mlt_consumer this )
 451 {
 452         xmlDocPtr doc = NULL;
 453
 454         // Get the producer service
 455         mlt_service service = mlt_service_producer( mlt_consumer_service( this ) );
 456         if ( service != NULL )
 457         {
 458                 doc = westley_make_doc( service );
 459
 460                 if ( mlt_properties_get( mlt_consumer_properties( this ), "resource" ) == NULL )
 461                         xmlDocFormatDump( stdout, doc, 1 );
 462                 else
 463                         xmlSaveFormatFile( mlt_properties_get( mlt_consumer_properties( this ), "resource" ), doc, 1 );
 464
 465                 xmlFreeDoc( doc );
 466         }
 467
 468         mlt_consumer_stop( this );
 469
 470         return 0;
 471 }
 472
 473 static int consumer_is_stopped( mlt_consumer this )
 474 {
 475         return 1;
 476 }