2 * mlt_factory.c -- the factory method interfaces
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
23 #include "mlt_repository.h"
29 /** Singleton repositories
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;
41 /** Construct the factories.
44 int mlt_factory_init( char *prefix
)
46 // Only initialise once
47 if ( mlt_prefix
== NULL
)
49 // Allow user over rides
50 if ( prefix
== NULL
|| !strcmp( prefix
, "" ) )
51 prefix
= getenv( "MLT_REPOSITORY" );
53 // If no directory is specified, default to install directory
57 // Store the prefix for later retrieval
58 mlt_prefix
= strdup( prefix
);
60 // Initialise the pool
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" ) );
70 // Create the object list.
71 object_list
= mlt_properties_new( );
73 // Create a repository for each service type
74 producers
= mlt_repository_init( object_list
, prefix
, "producers", "mlt_create_producer" );
75 filters
= mlt_repository_init( object_list
, prefix
, "filters", "mlt_create_filter" );
76 transitions
= mlt_repository_init( object_list
, prefix
, "transitions", "mlt_create_transition" );
77 consumers
= mlt_repository_init( object_list
, prefix
, "consumers", "mlt_create_consumer" );
79 // Force a clean up when app closes
80 atexit( mlt_factory_close
);
86 /** Fetch the prefix used in this instance.
89 const char *mlt_factory_prefix( )
94 /** Get a value from the environment.
97 char *mlt_environment( char *name
)
99 return mlt_properties_get( global_properties
, name
);
102 /** Fetch a producer from the repository.
105 mlt_producer
mlt_factory_producer( char *service
, void *input
)
107 mlt_producer obj
= NULL
;
109 // Pick up the default normalising producer if necessary
110 if ( service
== NULL
)
111 service
= mlt_environment( "MLT_PRODUCER" );
113 // Try to instantiate via the specified service
114 obj
= mlt_repository_fetch( producers
, service
, input
);
118 mlt_properties properties
= mlt_producer_properties( obj
);
119 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
120 mlt_properties_set( properties
, "mlt_type", "producer" );
121 if ( mlt_properties_get_int( properties
, "_mlt_service_hidden" ) == 0 )
122 mlt_properties_set( properties
, "mlt_service", service
);
127 /** Fetch a filter from the repository.
130 mlt_filter
mlt_factory_filter( char *service
, void *input
)
132 mlt_filter obj
= mlt_repository_fetch( filters
, service
, input
);
135 mlt_properties properties
= mlt_filter_properties( obj
);
136 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
137 mlt_properties_set( properties
, "mlt_type", "filter" );
138 mlt_properties_set( properties
, "mlt_service", service
);
143 /** Fetch a transition from the repository.
146 mlt_transition
mlt_factory_transition( char *service
, void *input
)
148 mlt_transition obj
= mlt_repository_fetch( transitions
, service
, input
);
151 mlt_properties properties
= mlt_transition_properties( obj
);
152 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
153 mlt_properties_set( properties
, "mlt_type", "transition" );
154 mlt_properties_set( properties
, "mlt_service", service
);
159 /** Fetch a consumer from the repository
162 mlt_consumer
mlt_factory_consumer( char *service
, void *input
)
164 mlt_consumer obj
= NULL
;
166 if ( service
== NULL
)
167 service
= mlt_environment( "MLT_CONSUMER" );
169 obj
= mlt_repository_fetch( consumers
, service
, input
);
173 mlt_filter filter
= mlt_factory_filter( "data_show", NULL
);
174 mlt_properties properties
= mlt_consumer_properties( obj
);
175 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
176 mlt_properties_set( properties
, "mlt_type", "consumer" );
177 mlt_properties_set( properties
, "mlt_service", service
);
178 mlt_service_attach( mlt_consumer_service( obj
), filter
);
179 mlt_filter_close( filter
);
184 /** Register an object for clean up.
187 void mlt_factory_register_for_clean_up( void *ptr
, mlt_destructor destructor
)
190 sprintf( unique
, "%08d", mlt_properties_count( global_properties
) );
191 mlt_properties_set_data( global_properties
, unique
, ptr
, 0, destructor
, NULL
);
194 /** Close the factory.
197 void mlt_factory_close( )
199 if ( mlt_prefix
!= NULL
)
201 mlt_repository_close( producers
);
202 mlt_repository_close( filters
);
203 mlt_repository_close( transitions
);
204 mlt_repository_close( consumers
);
205 mlt_properties_close( global_properties
);
206 mlt_properties_close( object_list
);