research.m1stereo.tv/gitweb/ - melted/blob - src/framework/mlt_factory.c

   1 /*
   2  * mlt_factory.c -- the factory method interfaces
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   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 "config.h"
  22 #include "mlt.h"
  23 #include "mlt_repository.h"
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 /** Singleton repositories
  30 */
  31
  32 static char *mlt_prefix = NULL;
  33 static mlt_properties global_properties = NULL;
  34 static mlt_properties object_list = NULL;
  35 static mlt_repository producers = NULL;
  36 static mlt_repository filters = NULL;
  37 static mlt_repository transitions = NULL;
  38 static mlt_repository consumers = NULL;
  39 static int unique_id = 0;
  40
  41 /** Construct the factories.
  42 */
  43
  44 int mlt_factory_init( char *prefix )
  45 {
  46         // Only initialise once
  47         if ( mlt_prefix == NULL )
  48         {
  49                 // Allow user over rides
  50                 if ( prefix == NULL )
  51                         prefix = getenv( "MLT_REPOSITORY" );
  52
  53                 // If no directory is specified, default to install directory
  54                 if ( prefix == NULL )
  55                         prefix = PREFIX_DATA;
  56
  57                 // Store the prefix for later retrieval
  58                 mlt_prefix = strdup( prefix );
  59
  60                 // Initialise the pool
  61                 mlt_pool_init( );
  62
  63                 // Create the global properties
  64                 global_properties = mlt_properties_new( );
  65                 mlt_properties_set_or_default( global_properties, "MLT_NORMALISATION", getenv( "MLT_NORMALISATION" ), "PAL" );
  66                 mlt_properties_set_or_default( global_properties, "MLT_PRODUCER", getenv( "MLT_PRODUCER" ), "fezzik" );
  67                 mlt_properties_set_or_default( global_properties, "MLT_CONSUMER", getenv( "MLT_CONSUMER" ), "sdl" );
  68                 mlt_properties_set( global_properties, "MLT_TEST_CARD", getenv( "MLT_TEST_CARD" ) );
  69
  70                 // Create the object list.
  71                 object_list = mlt_properties_new( );
  72
  73                 // Create a repository for each service type
  74                 producers = mlt_repository_init( object_list, prefix, "producers.dat", "mlt_create_producer" );
  75                 filters = mlt_repository_init( object_list, prefix, "filters.dat", "mlt_create_filter" );
  76                 transitions = mlt_repository_init( object_list, prefix, "transitions.dat", "mlt_create_transition" );
  77                 consumers = mlt_repository_init( object_list, prefix, "consumers.dat", "mlt_create_consumer" );
  78         }
  79
  80         return 0;
  81 }
  82
  83 /** Fetch the prefix used in this instance.
  84 */
  85
  86 const char *mlt_factory_prefix( )
  87 {
  88         return mlt_prefix;
  89 }
  90
  91 /** Get a value from the environment.
  92 */
  93
  94 char *mlt_environment( char *name )
  95 {
  96         return mlt_properties_get( global_properties, name );
  97 }
  98
  99 /** Fetch a producer from the repository.
 100 */
 101
 102 mlt_producer mlt_factory_producer( char *service, void *input )
 103 {
 104         mlt_producer obj = NULL;
 105
 106         // Pick up the default normalising producer if necessary
 107         if ( service == NULL )
 108                 service = mlt_environment( "MLT_PRODUCER" );
 109
 110         // Try to instantiate via the specified service
 111         obj = mlt_repository_fetch( producers, service, input );
 112
 113         if ( obj != NULL )
 114         {
 115                 mlt_properties properties = mlt_producer_properties( obj );
 116                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 117                 mlt_properties_set( properties, "mlt_type", "producer" );
 118                 if ( mlt_properties_get_int( properties, "_mlt_service_hidden" ) == 0 )
 119                         mlt_properties_set( properties, "mlt_service", service );
 120         }
 121         return obj;
 122 }
 123
 124 /** Fetch a filter from the repository.
 125 */
 126
 127 mlt_filter mlt_factory_filter( char *service, void *input )
 128 {
 129         mlt_filter obj = mlt_repository_fetch( filters, service, input );
 130         if ( obj != NULL )
 131         {
 132                 mlt_properties properties = mlt_filter_properties( obj );
 133                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 134                 mlt_properties_set( properties, "mlt_type", "filter" );
 135                 mlt_properties_set( properties, "mlt_service", service );
 136         }
 137         return obj;
 138 }
 139
 140 /** Fetch a transition from the repository.
 141 */
 142
 143 mlt_transition mlt_factory_transition( char *service, void *input )
 144 {
 145         mlt_transition obj = mlt_repository_fetch( transitions, service, input );
 146         if ( obj != NULL )
 147         {
 148                 mlt_properties properties = mlt_transition_properties( obj );
 149                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 150                 mlt_properties_set( properties, "mlt_type", "transition" );
 151                 mlt_properties_set( properties, "mlt_service", service );
 152         }
 153         return obj;
 154 }
 155
 156 /** Fetch a consumer from the repository
 157 */
 158
 159 mlt_consumer mlt_factory_consumer( char *service, void *input )
 160 {
 161         mlt_consumer obj = NULL;
 162
 163         if ( service == NULL )
 164                 service = mlt_environment( "MLT_CONSUMER" );
 165
 166         obj = mlt_repository_fetch( consumers, service, input );
 167
 168         if ( obj != NULL )
 169         {
 170                 mlt_properties properties = mlt_consumer_properties( obj );
 171                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 172                 mlt_properties_set( properties, "mlt_type", "consumer" );
 173                 mlt_properties_set( properties, "mlt_service", service );
 174         }
 175         return obj;
 176 }
 177
 178 /** Register an object for clean up.
 179 */
 180
 181 void mlt_factory_register_for_clean_up( void *ptr, mlt_destructor destructor )
 182 {
 183         char unique[ 256 ];
 184         sprintf( unique, "%08d", mlt_properties_count( global_properties ) );
 185         mlt_properties_set_data( global_properties, unique, ptr, 0, destructor, NULL );
 186 }
 187
 188 /** Close the factory.
 189 */
 190
 191 void mlt_factory_close( )
 192 {
 193         if ( mlt_prefix != NULL )
 194         {
 195                 mlt_repository_close( producers );
 196                 mlt_repository_close( filters );
 197                 mlt_repository_close( transitions );
 198                 mlt_repository_close( consumers );
 199                 mlt_properties_close( global_properties );
 200                 mlt_properties_close( object_list );
 201                 free( mlt_prefix );
 202                 mlt_prefix = NULL;
 203                 mlt_pool_close( );
 204         }
 205 }
 206