research.m1stereo.tv/gitweb/ - melted/blob - src/modules/westley/producer_westley.c

   1 /*
   2  * producer_westley.c -- a libxml2 parser of mlt service networks
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 // TODO: destroy unreferenced producers
  22
  23 #include "producer_westley.h"
  24 #include <framework/mlt.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28
  29 #include <libxml/parser.h>
  30
  31 #define STACK_SIZE 1000
  32
  33 struct deserialise_context_s
  34 {
  35         mlt_service stack_service[ STACK_SIZE ];
  36         int stack_service_size;
  37         int track_count;
  38         mlt_properties producer_map;
  39         mlt_properties destructors;
  40 };
  41 typedef struct deserialise_context_s *deserialise_context;
  42
  43
  44 /** Push a service.
  45 */
  46
  47 static int context_push_service( deserialise_context this, mlt_service that )
  48 {
  49         int ret = this->stack_service_size >= STACK_SIZE;
  50         if ( ret == 0 )
  51                 this->stack_service[ this->stack_service_size ++ ] = that;
  52         return ret;
  53 }
  54
  55 /** Pop a service.
  56 */
  57
  58 static mlt_service context_pop_service( deserialise_context this )
  59 {
  60         mlt_service result = NULL;
  61         if ( this->stack_service_size > 0 )
  62                 result = this->stack_service[ -- this->stack_service_size ];
  63         return result;
  64 }
  65
  66 // Set the destructor on a new service
  67 static void track_service( mlt_properties properties, void *service, mlt_destructor destructor )
  68 {
  69         int registered = mlt_properties_get_int( properties, "registered" );
  70         char *key = mlt_properties_get( properties, "registered" );
  71         mlt_properties_set_data( properties, key, service, 0, destructor, NULL );
  72         mlt_properties_set_int( properties, "registered", ++ registered );
  73 }
  74
  75 static void on_start_tractor( deserialise_context context, const xmlChar *name, const xmlChar **atts)
  76 {
  77         mlt_service service = mlt_tractor_service( mlt_tractor_init() );
  78         mlt_properties properties = mlt_service_properties( service );
  79
  80         track_service( context->destructors, service, (mlt_destructor) mlt_tractor_close );
  81
  82         mlt_properties_set_position( properties, "length", 0 );
  83
  84         for ( ; atts != NULL && *atts != NULL; atts += 2 )
  85                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
  86
  87         if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
  88         {
  89                 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
  90                 mlt_properties_set_position( properties, "length", length );
  91         }
  92
  93         context_push_service( context, service );
  94 }
  95
  96 static void on_start_multitrack( deserialise_context context, const xmlChar *name, const xmlChar **atts)
  97 {
  98         mlt_service service = mlt_multitrack_service( mlt_multitrack_init() );
  99
 100         track_service( context->destructors, service, (mlt_destructor) mlt_multitrack_close );
 101
 102         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 103                 mlt_properties_set( mlt_service_properties( service ), (char*) atts[0], (char*) atts[1] );
 104
 105         context_push_service( context, service );
 106 }
 107
 108 static void on_start_playlist( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 109 {
 110         mlt_service service = mlt_playlist_service( mlt_playlist_init() );
 111         mlt_properties properties = mlt_service_properties( service );
 112
 113         track_service( context->destructors, service, (mlt_destructor) mlt_playlist_close );
 114
 115         mlt_properties_set_position( properties, "length", 0 );
 116
 117         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 118                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 119
 120         if ( mlt_properties_get( properties, "id" ) != NULL )
 121                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 122
 123         if ( mlt_properties_get_position( properties, "length" ) < mlt_properties_get_position( properties, "out" ) )
 124         {
 125                 mlt_position length = mlt_properties_get_position( properties, "out" ) + 1;
 126                 mlt_properties_set_position( properties, "length", length );
 127         }
 128
 129         context_push_service( context, service );
 130 }
 131
 132 static void on_start_producer( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 133 {
 134         mlt_properties properties = mlt_properties_new();
 135         mlt_service service = NULL;
 136
 137         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 138         {
 139                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 140         }
 141
 142         service = MLT_SERVICE( mlt_factory_producer( "fezzik", mlt_properties_get( properties, "resource" ) ) );
 143
 144         if ( service == NULL && mlt_properties_get( properties, "mlt_service" ) != NULL )
 145         {
 146                 service = MLT_SERVICE( mlt_factory_producer( mlt_properties_get( properties, "mlt_service" ),
 147                         mlt_properties_get( properties, "resource" ) ) );
 148         }
 149
 150         track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
 151
 152         // Add the producer to the producer map
 153         if ( mlt_properties_get( properties, "id" ) != NULL )
 154                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 155
 156         mlt_properties_inherit( mlt_service_properties( service ), properties );
 157         mlt_properties_close( properties );
 158
 159         context_push_service( context, service );
 160 }
 161
 162 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 163 {
 164         // Get the playlist from the stack
 165         mlt_service service = context_pop_service( context );
 166         mlt_position length = 0;
 167
 168         // Look for the length attribute
 169         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 170         {
 171                 if ( strcmp( atts[0], "length" ) == 0 )
 172                 {
 173                         length = atoll( atts[1] );
 174                         break;
 175                 }
 176         }
 177
 178         // Append a blank to the playlist
 179         mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
 180
 181         // Push the playlist back onto the stack
 182         context_push_service( context, service );
 183 }
 184
 185 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 186 {
 187         // Look for the producer attribute
 188         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 189         {
 190                 if ( strcmp( atts[0], "producer" ) == 0 )
 191                 {
 192                         if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) !=  NULL )
 193                                 // Push the referenced producer onto the stack
 194                                 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
 195                         break;
 196                 }
 197         }
 198 }
 199
 200 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 201 {
 202         char *id;
 203         mlt_properties properties = mlt_properties_new();
 204         char key[11];
 205         key[ 10 ] = '\0';
 206
 207         // Get the producer from the stack
 208         mlt_service producer = context_pop_service( context );
 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         // Create the filter
 215         mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 216
 217         track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
 218
 219         // Connect the filter to the producer
 220         mlt_filter_connect( MLT_FILTER( service ), producer,
 221                 mlt_properties_get_int( properties, "track" ) );
 222
 223         // Set in and out from producer if non existant
 224         if ( mlt_properties_get( properties, "in" ) == NULL )
 225                 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
 226         if ( mlt_properties_get( properties, "out" ) == NULL )
 227                 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
 228
 229         // Propogate the properties
 230         mlt_properties_inherit( mlt_service_properties( service ), properties );
 231         mlt_properties_close( properties );
 232
 233         // Get the parent producer from the stack
 234         mlt_service tractor = context_pop_service( context );
 235
 236         if ( tractor != NULL )
 237         {
 238                 // Connect the filter to the tractor
 239                 if ( strcmp( mlt_properties_get( mlt_service_properties( tractor ), "resource" ), "<tractor>" ) == 0 )
 240                         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 241
 242                 // Push the parent producer back onto the stack
 243                 context_push_service( context, tractor );
 244         }
 245
 246         // If a producer alias is in the producer_map, get it
 247         snprintf( key, 10, "%p", producer );
 248         if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
 249                 producer = mlt_properties_get_data( context->producer_map, key, NULL );
 250
 251         // Put the producer in the producer map
 252         id = mlt_properties_get( mlt_service_properties( producer ), "id" );
 253         if ( id != NULL )
 254                 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
 255
 256         // For filter chain support, add an alias to the producer map
 257         snprintf( key, 10, "%p", service );
 258         mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
 259
 260         // Push the filter onto the stack
 261         context_push_service( context, service );
 262 }
 263
 264 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 265 {
 266         mlt_properties properties = mlt_properties_new();
 267
 268         // Get the producer from the stack
 269         mlt_service producer = context_pop_service( context );
 270
 271         // Set the properties
 272         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 273                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 274
 275         // Create the transition
 276         mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 277
 278         track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
 279
 280         // Propogate the properties
 281         mlt_properties_inherit( mlt_service_properties( service ), properties );
 282         mlt_properties_close( properties );
 283
 284         // Connect the filter to the producer
 285         mlt_transition_connect( MLT_TRANSITION( service ), producer,
 286                 mlt_properties_get_int( mlt_service_properties( service ), "a_track" ),
 287                 mlt_properties_get_int( mlt_service_properties( service ), "b_track" ) );
 288
 289         // Get the tractor from the stack
 290         mlt_service tractor = context_pop_service( context );
 291
 292         // Connect the tractor to the transition
 293         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 294
 295         // Push the tractor back onto the stack
 296         context_push_service( context, tractor );
 297
 298         // Push the transition onto the stack
 299         context_push_service( context, service );
 300 }
 301
 302 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
 303 {
 304         // Get the producer (multitrack) from the stack
 305         mlt_service producer = context_pop_service( context );
 306
 307         // Get the tractor from the stack
 308         mlt_service service = context_pop_service( context );
 309
 310         // Connect the tractor to the producer
 311         mlt_tractor_connect( MLT_TRACTOR( service ), producer );
 312         mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
 313                 MLT_MULTITRACK( producer ), 0, NULL, NULL );
 314
 315         // Push the tractor back onto the stack
 316         context_push_service( context, service );
 317
 318         // Push the producer back onto the stack
 319         context_push_service( context, producer );
 320 }
 321
 322 static void on_end_playlist( deserialise_context context, const xmlChar *name )
 323 {
 324         // Get the producer (playlist) from the stack
 325         mlt_service producer = context_pop_service( context );
 326
 327         // Push the producer back onto the stack
 328         context_push_service( context, producer );
 329 }
 330
 331 static void on_end_track( deserialise_context context, const xmlChar *name )
 332 {
 333         // Get the producer from the stack
 334         mlt_service producer = context_pop_service( context );
 335
 336         // Get the multitrack from the stack
 337         mlt_service service = context_pop_service( context );
 338
 339         // Set the track on the multitrack
 340         mlt_multitrack_connect( MLT_MULTITRACK( service ),
 341                 MLT_PRODUCER( producer ),
 342                 context->track_count++ );
 343
 344         // Push the multitrack back onto the stack
 345         context_push_service( context, service );
 346 }
 347
 348 static void on_end_entry( deserialise_context context, const xmlChar *name )
 349 {
 350         // Get the producer from the stack
 351         mlt_service producer = context_pop_service( context );
 352
 353         // Get the playlist from the stack
 354         mlt_service service = context_pop_service( context );
 355
 356         // Append the producer to the playlist
 357         mlt_playlist_append_io( MLT_PLAYLIST( service ),
 358                 MLT_PRODUCER( producer ),
 359                 mlt_properties_get_position( mlt_service_properties( producer ), "in" ),
 360                 mlt_properties_get_position( mlt_service_properties( producer ), "out" ) );
 361
 362         // Push the playlist back onto the stack
 363         context_push_service( context, service );
 364 }
 365
 366 static void on_end_tractor( deserialise_context context, const xmlChar *name )
 367 {
 368         // Get and discard the last producer
 369         mlt_producer multitrack = MLT_PRODUCER( context_pop_service( context ) );
 370
 371         // Inherit the producer's properties
 372         mlt_properties properties = mlt_producer_properties( multitrack );
 373         mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
 374         mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
 375         mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
 376 }
 377
 378 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
 379 {
 380         deserialise_context context = ( deserialise_context ) ctx;
 381
 382         if ( strcmp( name, "tractor" ) == 0 )
 383                 on_start_tractor( context, name, atts );
 384         else if ( strcmp( name, "multitrack" ) == 0 )
 385                 on_start_multitrack( context, name, atts );
 386         else if ( strcmp( name, "playlist" ) == 0 )
 387                 on_start_playlist( context, name, atts );
 388         else if ( strcmp( name, "producer" ) == 0 )
 389                 on_start_producer( context, name, atts );
 390         else if ( strcmp( name, "blank" ) == 0 )
 391                 on_start_blank( context, name, atts );
 392         else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
 393                 on_start_entry_track( context, name, atts );
 394         else if ( strcmp( name, "filter" ) == 0 )
 395                 on_start_filter( context, name, atts );
 396         else if ( strcmp( name, "transition" ) == 0 )
 397                 on_start_transition( context, name, atts );
 398 }
 399
 400 static void on_end_element( void *ctx, const xmlChar *name )
 401 {
 402         deserialise_context context = ( deserialise_context ) ctx;
 403
 404         if ( strcmp( name, "multitrack" ) == 0 )
 405                 on_end_multitrack( context, name );
 406         else if ( strcmp( name, "playlist" ) == 0 )
 407                 on_end_playlist( context, name );
 408         else if ( strcmp( name, "track" ) == 0 )
 409                 on_end_track( context, name );
 410         else if ( strcmp( name, "entry" ) == 0 )
 411                 on_end_entry( context, name );
 412         else if ( strcmp( name, "tractor" ) == 0 )
 413                 on_end_tractor( context, name );
 414 }
 415
 416
 417 mlt_producer producer_westley_init( char *filename )
 418 {
 419         static int init = 0;
 420         xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
 421         struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
 422         mlt_properties properties = NULL;
 423         int i = 0;
 424
 425         context->producer_map = mlt_properties_new();
 426         context->destructors = mlt_properties_new();
 427         // We need to track the number of registered filters
 428         mlt_properties_set_int( context->destructors, "registered", 0 );
 429         sax->startElement = on_start_element;
 430         sax->endElement = on_end_element;
 431
 432         if ( !init )
 433         {
 434                 xmlInitParser();
 435                 //init = 1;
 436         }
 437
 438         xmlSAXUserParseFile( sax, context, filename );
 439
 440         // Need the complete producer list for various reasons
 441         properties = context->destructors;
 442
 443         // Get the last producer on the stack
 444         mlt_service service = context_pop_service( context );
 445
 446         // Do we actually have a producer here?
 447         if ( service != NULL )
 448         {
 449                 // Now make sure we don't have a reference to the service in the properties
 450                 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
 451                 {
 452                         char *name = mlt_properties_get_name( properties, i );
 453                         if ( mlt_properties_get_data( properties, name, NULL ) == service )
 454                         {
 455                                 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
 456                                 break;
 457                         }
 458                 }
 459
 460                 // We are done referencing destructor property list
 461                 // Set this var to service properties for convenience
 462                 properties = mlt_service_properties( service );
 463
 464                 // make the returned service destroy the connected services
 465                 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
 466
 467                 // Now assign additional properties
 468                 mlt_properties_set( properties, "resource", filename );
 469
 470                 // This tells consumer_westley not to deep copy
 471                 mlt_properties_set( properties, "westley", "was here" );
 472         }
 473         else
 474         {
 475                 // Clean up
 476                 mlt_properties_close( properties );
 477         }
 478
 479         free( context->stack_service );
 480         mlt_properties_close( context->producer_map );
 481         //free( context );
 482         free( sax );
 483         xmlCleanupParser();
 484         xmlMemoryDump( );
 485
 486
 487         return MLT_PRODUCER( service );
 488 }
 489