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         if ( mlt_properties_get( properties, "mlt_service" ) != NULL )
 143         {
 144                 service = MLT_SERVICE( mlt_factory_producer( mlt_properties_get( properties, "mlt_service" ),
 145                         mlt_properties_get( properties, "resource" ) ) );
 146         }
 147         else
 148         {
 149                 // Unspecified producer, use inigo
 150                 char *args[2] = { mlt_properties_get( properties, "resource" ), 0 };
 151                 service = MLT_SERVICE( mlt_factory_producer( "inigo", args ) );
 152         }
 153
 154         track_service( context->destructors, service, (mlt_destructor) mlt_producer_close );
 155
 156         // Add the producer to the producer map
 157         if ( mlt_properties_get( properties, "id" ) != NULL )
 158                 mlt_properties_set_data( context->producer_map, mlt_properties_get( properties, "id" ), service, 0, NULL, NULL );
 159
 160         mlt_properties_inherit( mlt_service_properties( service ), properties );
 161         mlt_properties_close( properties );
 162
 163         context_push_service( context, service );
 164 }
 165
 166 static void on_start_blank( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 167 {
 168         // Get the playlist from the stack
 169         mlt_service service = context_pop_service( context );
 170         mlt_position length = 0;
 171
 172         // Look for the length attribute
 173         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 174         {
 175                 if ( strcmp( atts[0], "length" ) == 0 )
 176                 {
 177                         length = atoll( atts[1] );
 178                         break;
 179                 }
 180         }
 181
 182         // Append a blank to the playlist
 183         mlt_playlist_blank( MLT_PLAYLIST( service ), length - 1 );
 184
 185         // Push the playlist back onto the stack
 186         context_push_service( context, service );
 187 }
 188
 189 static void on_start_entry_track( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 190 {
 191         // Look for the producer attribute
 192         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 193         {
 194                 if ( strcmp( atts[0], "producer" ) == 0 )
 195                 {
 196                         if ( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) !=  NULL )
 197                                 // Push the referenced producer onto the stack
 198                                 context_push_service( context, MLT_SERVICE( mlt_properties_get_data( context->producer_map, (char*) atts[1], NULL ) ) );
 199                         break;
 200                 }
 201         }
 202 }
 203
 204 static void on_start_filter( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 205 {
 206         char *id;
 207         mlt_properties properties = mlt_properties_new();
 208         char key[11];
 209         key[ 10 ] = '\0';
 210
 211         // Get the producer from the stack
 212         mlt_service producer = context_pop_service( context );
 213
 214         // Set the properties
 215         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 216                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 217
 218         // Create the filter
 219         mlt_service service = MLT_SERVICE( mlt_factory_filter( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 220
 221         track_service( context->destructors, service, (mlt_destructor) mlt_filter_close );
 222
 223         // Connect the filter to the producer
 224         mlt_filter_connect( MLT_FILTER( service ), producer,
 225                 mlt_properties_get_int( properties, "track" ) );
 226
 227         // Set in and out from producer if non existant
 228         if ( mlt_properties_get( properties, "in" ) == NULL )
 229                 mlt_properties_set_position( properties, "in", mlt_producer_get_in( MLT_PRODUCER( producer ) ) );
 230         if ( mlt_properties_get( properties, "out" ) == NULL )
 231                 mlt_properties_set_position( properties, "out", mlt_producer_get_out( MLT_PRODUCER( producer ) ) );
 232
 233         // Propogate the properties
 234         mlt_properties_inherit( mlt_service_properties( service ), properties );
 235         mlt_properties_close( properties );
 236
 237         // Get the parent producer from the stack
 238         mlt_service tractor = context_pop_service( context );
 239
 240         if ( tractor != NULL )
 241         {
 242                 // Connect the filter to the tractor
 243                 if ( strcmp( mlt_properties_get( mlt_service_properties( tractor ), "resource" ), "<tractor>" ) == 0 )
 244                         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 245
 246                 // Push the parent producer back onto the stack
 247                 context_push_service( context, tractor );
 248         }
 249
 250         // If a producer alias is in the producer_map, get it
 251         snprintf( key, 10, "%p", producer );
 252         if ( mlt_properties_get_data( context->producer_map, key, NULL ) != NULL )
 253                 producer = mlt_properties_get_data( context->producer_map, key, NULL );
 254
 255         // Put the producer in the producer map
 256         id = mlt_properties_get( mlt_service_properties( producer ), "id" );
 257         if ( id != NULL )
 258                 mlt_properties_set_data( context->producer_map, id, service, 0, NULL, NULL );
 259
 260         // For filter chain support, add an alias to the producer map
 261         snprintf( key, 10, "%p", service );
 262         mlt_properties_set_data( context->producer_map, key, producer, 0, NULL, NULL );
 263
 264         // Push the filter onto the stack
 265         context_push_service( context, service );
 266 }
 267
 268 static void on_start_transition( deserialise_context context, const xmlChar *name, const xmlChar **atts)
 269 {
 270         mlt_properties properties = mlt_properties_new();
 271
 272         // Get the producer from the stack
 273         mlt_service producer = context_pop_service( context );
 274
 275         // Set the properties
 276         for ( ; atts != NULL && *atts != NULL; atts += 2 )
 277                 mlt_properties_set( properties, (char*) atts[0], (char*) atts[1] );
 278
 279         // Create the transition
 280         mlt_service service = MLT_SERVICE( mlt_factory_transition( mlt_properties_get( properties, "mlt_service" ), NULL ) );
 281
 282         track_service( context->destructors, service, (mlt_destructor) mlt_transition_close );
 283
 284         // Propogate the properties
 285         mlt_properties_inherit( mlt_service_properties( service ), properties );
 286         mlt_properties_close( properties );
 287
 288         // Connect the filter to the producer
 289         mlt_transition_connect( MLT_TRANSITION( service ), producer,
 290                 mlt_properties_get_int( mlt_service_properties( service ), "a_track" ),
 291                 mlt_properties_get_int( mlt_service_properties( service ), "b_track" ) );
 292
 293         // Get the tractor from the stack
 294         mlt_service tractor = context_pop_service( context );
 295
 296         // Connect the tractor to the transition
 297         mlt_tractor_connect( MLT_TRACTOR( tractor ), service );
 298
 299         // Push the tractor back onto the stack
 300         context_push_service( context, tractor );
 301
 302         // Push the transition onto the stack
 303         context_push_service( context, service );
 304 }
 305
 306 static void on_end_multitrack( deserialise_context context, const xmlChar *name )
 307 {
 308         // Get the producer (multitrack) from the stack
 309         mlt_service producer = context_pop_service( context );
 310
 311         // Get the tractor from the stack
 312         mlt_service service = context_pop_service( context );
 313
 314         // Connect the tractor to the producer
 315         mlt_tractor_connect( MLT_TRACTOR( service ), producer );
 316         mlt_properties_set_data( mlt_service_properties( service ), "multitrack",
 317                 MLT_MULTITRACK( producer ), 0, NULL, NULL );
 318
 319         // Push the tractor back onto the stack
 320         context_push_service( context, service );
 321
 322         // Push the producer back onto the stack
 323         context_push_service( context, producer );
 324 }
 325
 326 static void on_end_playlist( deserialise_context context, const xmlChar *name )
 327 {
 328         // Get the producer (playlist) from the stack
 329         mlt_service producer = context_pop_service( context );
 330
 331         // Push the producer back onto the stack
 332         context_push_service( context, producer );
 333 }
 334
 335 static void on_end_track( deserialise_context context, const xmlChar *name )
 336 {
 337         // Get the producer from the stack
 338         mlt_service producer = context_pop_service( context );
 339
 340         // Get the multitrack from the stack
 341         mlt_service service = context_pop_service( context );
 342
 343         // Set the track on the multitrack
 344         mlt_multitrack_connect( MLT_MULTITRACK( service ),
 345                 MLT_PRODUCER( producer ),
 346                 context->track_count++ );
 347
 348         // Push the multitrack back onto the stack
 349         context_push_service( context, service );
 350 }
 351
 352 static void on_end_entry( deserialise_context context, const xmlChar *name )
 353 {
 354         // Get the producer from the stack
 355         mlt_service producer = context_pop_service( context );
 356
 357         // Get the playlist from the stack
 358         mlt_service service = context_pop_service( context );
 359
 360         // Append the producer to the playlist
 361         mlt_playlist_append_io( MLT_PLAYLIST( service ),
 362                 MLT_PRODUCER( producer ),
 363                 mlt_properties_get_position( mlt_service_properties( producer ), "in" ),
 364                 mlt_properties_get_position( mlt_service_properties( producer ), "out" ) );
 365
 366         // Push the playlist back onto the stack
 367         context_push_service( context, service );
 368 }
 369
 370 static void on_end_tractor( deserialise_context context, const xmlChar *name )
 371 {
 372         // Get and discard the last producer
 373         mlt_producer multitrack = MLT_PRODUCER( context_pop_service( context ) );
 374
 375         // Inherit the producer's properties
 376         mlt_properties properties = mlt_producer_properties( multitrack );
 377         mlt_properties_set_position( properties, "length", mlt_producer_get_out( multitrack ) + 1 );
 378         mlt_producer_set_in_and_out( multitrack, 0, mlt_producer_get_out( multitrack ) );
 379         mlt_properties_set_double( properties, "fps", mlt_producer_get_fps( multitrack ) );
 380 }
 381
 382 static void on_start_element( void *ctx, const xmlChar *name, const xmlChar **atts)
 383 {
 384         deserialise_context context = ( deserialise_context ) ctx;
 385
 386         if ( strcmp( name, "tractor" ) == 0 )
 387                 on_start_tractor( context, name, atts );
 388         else if ( strcmp( name, "multitrack" ) == 0 )
 389                 on_start_multitrack( context, name, atts );
 390         else if ( strcmp( name, "playlist" ) == 0 )
 391                 on_start_playlist( context, name, atts );
 392         else if ( strcmp( name, "producer" ) == 0 )
 393                 on_start_producer( context, name, atts );
 394         else if ( strcmp( name, "blank" ) == 0 )
 395                 on_start_blank( context, name, atts );
 396         else if ( strcmp( name, "entry" ) == 0 || strcmp( name, "track" ) == 0 )
 397                 on_start_entry_track( context, name, atts );
 398         else if ( strcmp( name, "filter" ) == 0 )
 399                 on_start_filter( context, name, atts );
 400         else if ( strcmp( name, "transition" ) == 0 )
 401                 on_start_transition( context, name, atts );
 402 }
 403
 404 static void on_end_element( void *ctx, const xmlChar *name )
 405 {
 406         deserialise_context context = ( deserialise_context ) ctx;
 407
 408         if ( strcmp( name, "multitrack" ) == 0 )
 409                 on_end_multitrack( context, name );
 410         else if ( strcmp( name, "playlist" ) == 0 )
 411                 on_end_playlist( context, name );
 412         else if ( strcmp( name, "track" ) == 0 )
 413                 on_end_track( context, name );
 414         else if ( strcmp( name, "entry" ) == 0 )
 415                 on_end_entry( context, name );
 416         else if ( strcmp( name, "tractor" ) == 0 )
 417                 on_end_tractor( context, name );
 418 }
 419
 420
 421 mlt_producer producer_westley_init( char *filename )
 422 {
 423         static int init = 0;
 424         xmlSAXHandler *sax = calloc( 1, sizeof( xmlSAXHandler ) );
 425         struct deserialise_context_s *context = calloc( 1, sizeof( struct deserialise_context_s ) );
 426         mlt_properties properties = NULL;
 427         int i = 0;
 428
 429         context->producer_map = mlt_properties_new();
 430         context->destructors = mlt_properties_new();
 431         // We need to track the number of registered filters
 432         mlt_properties_set_int( context->destructors, "registered", 0 );
 433         sax->startElement = on_start_element;
 434         sax->endElement = on_end_element;
 435
 436         if ( !init )
 437         {
 438                 xmlInitParser();
 439                 //init = 1;
 440         }
 441
 442         xmlSAXUserParseFile( sax, context, filename );
 443
 444         // Need the complete producer list for various reasons
 445         properties = context->destructors;
 446
 447         // Get the last producer on the stack
 448         mlt_service service = context_pop_service( context );
 449
 450         // Do we actually have a producer here?
 451         if ( service != NULL )
 452         {
 453                 // Now make sure we don't have a reference to the service in the properties
 454                 for ( i = mlt_properties_count( properties ) - 1; i >= 1; i -- )
 455                 {
 456                         char *name = mlt_properties_get_name( properties, i );
 457                         if ( mlt_properties_get_data( properties, name, NULL ) == service )
 458                         {
 459                                 mlt_properties_set_data( properties, name, service, 0, NULL, NULL );
 460                                 break;
 461                         }
 462                 }
 463
 464                 // We are done referencing destructor property list
 465                 // Set this var to service properties for convenience
 466                 properties = mlt_service_properties( service );
 467
 468                 // make the returned service destroy the connected services
 469                 mlt_properties_set_data( properties, "__destructors__", context->destructors, 0, (mlt_destructor) mlt_properties_close, NULL );
 470
 471                 // Now assign additional properties
 472                 mlt_properties_set( properties, "resource", filename );
 473
 474                 // This tells consumer_westley not to deep copy
 475                 mlt_properties_set( properties, "westley", "was here" );
 476         }
 477         else
 478         {
 479                 // Clean up
 480                 mlt_properties_close( properties );
 481         }
 482
 483         free( context->stack_service );
 484         mlt_properties_close( context->producer_map );
 485         //free( context );
 486         free( sax );
 487         xmlCleanupParser();
 488         xmlMemoryDump( );
 489
 490
 491         return MLT_PRODUCER( service );
 492 }
 493