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
  69                 // Create the object list.
  70                 object_list = mlt_properties_new( );
  71
  72                 // Create a repository for each service type
  73                 producers = mlt_repository_init( object_list, prefix, "producers.dat", "mlt_create_producer" );
  74                 filters = mlt_repository_init( object_list, prefix, "filters.dat", "mlt_create_filter" );
  75                 transitions = mlt_repository_init( object_list, prefix, "transitions.dat", "mlt_create_transition" );
  76                 consumers = mlt_repository_init( object_list, prefix, "consumers.dat", "mlt_create_consumer" );
  77         }
  78
  79         return 0;
  80 }
  81
  82 /** Fetch the prefix used in this instance.
  83 */
  84
  85 const char *mlt_factory_prefix( )
  86 {
  87         return mlt_prefix;
  88 }
  89
  90 /** Get a value from the environment.
  91 */
  92
  93 char *mlt_environment( char *name )
  94 {
  95         return mlt_properties_get( global_properties, name );
  96 }
  97
  98 /** Fetch a producer from the repository.
  99 */
 100
 101 mlt_producer mlt_factory_producer( char *service, void *input )
 102 {
 103         mlt_producer obj = NULL;
 104
 105         // Pick up the default normalising producer if necessary
 106         if ( service == NULL )
 107                 service = mlt_environment( "MLT_PRODUCER" );
 108
 109         // Try to instantiate via the specified service
 110         obj = mlt_repository_fetch( producers, service, input );
 111
 112         if ( obj != NULL )
 113         {
 114                 mlt_properties properties = mlt_producer_properties( obj );
 115                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 116                 mlt_properties_set( properties, "mlt_type", "producer" );
 117                 if ( mlt_properties_get_int( properties, "_mlt_service_hidden" ) == 0 )
 118                         mlt_properties_set( properties, "mlt_service", service );
 119         }
 120         return obj;
 121 }
 122
 123 /** Fetch a filter from the repository.
 124 */
 125
 126 mlt_filter mlt_factory_filter( char *service, void *input )
 127 {
 128         mlt_filter obj = mlt_repository_fetch( filters, service, input );
 129         if ( obj != NULL )
 130         {
 131                 mlt_properties properties = mlt_filter_properties( obj );
 132                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 133                 mlt_properties_set( properties, "mlt_type", "filter" );
 134                 mlt_properties_set( properties, "mlt_service", service );
 135         }
 136         return obj;
 137 }
 138
 139 /** Fetch a transition from the repository.
 140 */
 141
 142 mlt_transition mlt_factory_transition( char *service, void *input )
 143 {
 144         mlt_transition obj = mlt_repository_fetch( transitions, service, input );
 145         if ( obj != NULL )
 146         {
 147                 mlt_properties properties = mlt_transition_properties( obj );
 148                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 149                 mlt_properties_set( properties, "mlt_type", "transition" );
 150                 mlt_properties_set( properties, "mlt_service", service );
 151         }
 152         return obj;
 153 }
 154
 155 /** Fetch a consumer from the repository
 156 */
 157
 158 mlt_consumer mlt_factory_consumer( char *service, void *input )
 159 {
 160         mlt_consumer obj = NULL;
 161
 162         if ( service == NULL )
 163                 service = mlt_environment( "MLT_CONSUMER" );
 164
 165         obj = mlt_repository_fetch( consumers, service, input );
 166
 167         if ( obj != NULL )
 168         {
 169                 mlt_properties properties = mlt_consumer_properties( obj );
 170                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 171                 mlt_properties_set( properties, "mlt_type", "consumer" );
 172                 mlt_properties_set( properties, "mlt_service", service );
 173         }
 174         return obj;
 175 }
 176
 177 /** Close the factory.
 178 */
 179
 180 void mlt_factory_close( )
 181 {
 182         if ( mlt_prefix != NULL )
 183         {
 184                 mlt_repository_close( producers );
 185                 mlt_repository_close( filters );
 186                 mlt_repository_close( transitions );
 187                 mlt_repository_close( consumers );
 188                 mlt_properties_close( object_list );
 189                 mlt_properties_close( global_properties );
 190                 free( mlt_prefix );
 191                 mlt_prefix = NULL;
 192                 mlt_pool_close( );
 193         }
 194 }
 195