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 mlt_properties event_object
= NULL
;
40 static int unique_id
= 0;
42 /** Event transmitters.
45 static void mlt_factory_create_request( mlt_listener listener
, mlt_properties owner
, mlt_service
this, void **args
)
47 if ( listener
!= NULL
)
48 listener( owner
, this, ( char * )args
[ 0 ], ( char * )args
[ 1 ], ( mlt_service
* )args
[ 2 ] );
51 static void mlt_factory_create_done( mlt_listener listener
, mlt_properties owner
, mlt_service
this, void **args
)
53 if ( listener
!= NULL
)
54 listener( owner
, this, ( char * )args
[ 0 ], ( char * )args
[ 1 ], ( mlt_service
)args
[ 2 ] );
57 /** Construct the factories.
60 int mlt_factory_init( char *prefix
)
62 // Only initialise once
63 if ( mlt_prefix
== NULL
)
65 // Allow user over rides
66 if ( prefix
== NULL
|| !strcmp( prefix
, "" ) )
67 prefix
= getenv( "MLT_REPOSITORY" );
69 // If no directory is specified, default to install directory
73 // Store the prefix for later retrieval
74 mlt_prefix
= strdup( prefix
);
76 // Initialise the pool
79 // Create and set up the events object
80 event_object
= mlt_properties_new( );
81 mlt_events_init( event_object
);
82 mlt_events_register( event_object
, "producer-create-request", ( mlt_transmitter
)mlt_factory_create_request
);
83 mlt_events_register( event_object
, "producer-create-done", ( mlt_transmitter
)mlt_factory_create_done
);
84 mlt_events_register( event_object
, "filter-create-request", ( mlt_transmitter
)mlt_factory_create_request
);
85 mlt_events_register( event_object
, "filter-create-done", ( mlt_transmitter
)mlt_factory_create_done
);
86 mlt_events_register( event_object
, "transition-create-request", ( mlt_transmitter
)mlt_factory_create_request
);
87 mlt_events_register( event_object
, "transition-create-done", ( mlt_transmitter
)mlt_factory_create_done
);
88 mlt_events_register( event_object
, "consumer-create-request", ( mlt_transmitter
)mlt_factory_create_request
);
89 mlt_events_register( event_object
, "consumer-create-done", ( mlt_transmitter
)mlt_factory_create_done
);
91 // Create the global properties
92 global_properties
= mlt_properties_new( );
93 mlt_properties_set_or_default( global_properties
, "MLT_NORMALISATION", getenv( "MLT_NORMALISATION" ), "PAL" );
94 mlt_properties_set_or_default( global_properties
, "MLT_PRODUCER", getenv( "MLT_PRODUCER" ), "fezzik" );
95 mlt_properties_set_or_default( global_properties
, "MLT_CONSUMER", getenv( "MLT_CONSUMER" ), "sdl" );
96 mlt_properties_set( global_properties
, "MLT_TEST_CARD", getenv( "MLT_TEST_CARD" ) );
98 // Create the object list.
99 object_list
= mlt_properties_new( );
101 // Create a repository for each service type
102 producers
= mlt_repository_init( object_list
, prefix
, "producers", "mlt_create_producer" );
103 filters
= mlt_repository_init( object_list
, prefix
, "filters", "mlt_create_filter" );
104 transitions
= mlt_repository_init( object_list
, prefix
, "transitions", "mlt_create_transition" );
105 consumers
= mlt_repository_init( object_list
, prefix
, "consumers", "mlt_create_consumer" );
107 // Force a clean up when app closes
108 atexit( mlt_factory_close
);
114 /** Fetch the events object.
117 mlt_properties
mlt_factory_event_object( )
122 /** Fetch the prefix used in this instance.
125 const char *mlt_factory_prefix( )
130 /** Get a value from the environment.
133 char *mlt_environment( char *name
)
135 return mlt_properties_get( global_properties
, name
);
138 /** Fetch a producer from the repository.
141 mlt_producer
mlt_factory_producer( char *service
, void *input
)
143 mlt_producer obj
= NULL
;
145 // Pick up the default normalising producer if necessary
146 if ( service
== NULL
)
147 service
= mlt_environment( "MLT_PRODUCER" );
149 // Offer the application the chance to 'create'
150 mlt_events_fire( event_object
, "producer-create-request", service
, input
, &obj
, NULL
);
152 // Try to instantiate via the specified service
155 obj
= mlt_repository_fetch( producers
, service
, input
);
156 mlt_events_fire( event_object
, "producer-create-done", service
, input
, obj
, NULL
);
159 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( obj
);
160 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
161 mlt_properties_set( properties
, "mlt_type", "producer" );
162 if ( mlt_properties_get_int( properties
, "_mlt_service_hidden" ) == 0 )
163 mlt_properties_set( properties
, "mlt_service", service
);
169 /** Fetch a filter from the repository.
172 mlt_filter
mlt_factory_filter( char *service
, void *input
)
174 mlt_filter obj
= NULL
;
176 // Offer the application the chance to 'create'
177 mlt_events_fire( event_object
, "filter-create-request", service
, input
, &obj
, NULL
);
181 obj
= mlt_repository_fetch( filters
, service
, input
);
182 mlt_events_fire( event_object
, "filter-create-done", service
, input
, obj
, NULL
);
187 mlt_properties properties
= MLT_FILTER_PROPERTIES( obj
);
188 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
189 mlt_properties_set( properties
, "mlt_type", "filter" );
190 mlt_properties_set( properties
, "mlt_service", service
);
195 /** Fetch a transition from the repository.
198 mlt_transition
mlt_factory_transition( char *service
, void *input
)
200 mlt_transition obj
= NULL
;
202 // Offer the application the chance to 'create'
203 mlt_events_fire( event_object
, "transition-create-request", service
, input
, &obj
, NULL
);
207 obj
= mlt_repository_fetch( transitions
, service
, input
);
208 mlt_events_fire( event_object
, "transition-create-done", service
, input
, obj
, NULL
);
213 mlt_properties properties
= MLT_TRANSITION_PROPERTIES( obj
);
214 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
215 mlt_properties_set( properties
, "mlt_type", "transition" );
216 mlt_properties_set( properties
, "mlt_service", service
);
221 /** Fetch a consumer from the repository
224 mlt_consumer
mlt_factory_consumer( char *service
, void *input
)
226 mlt_consumer obj
= NULL
;
228 if ( service
== NULL
)
229 service
= mlt_environment( "MLT_CONSUMER" );
231 // Offer the application the chance to 'create'
232 mlt_events_fire( event_object
, "consumer-create-request", service
, input
, &obj
, NULL
);
236 obj
= mlt_repository_fetch( consumers
, service
, input
);
237 mlt_events_fire( event_object
, "consumer-create-done", service
, input
, obj
, NULL
);
242 mlt_filter filter
= mlt_factory_filter( "data_show", NULL
);
243 mlt_properties properties
= MLT_CONSUMER_PROPERTIES( obj
);
244 mlt_properties_set_int( properties
, "_unique_id", ++ unique_id
);
245 mlt_properties_set( properties
, "mlt_type", "consumer" );
246 mlt_properties_set( properties
, "mlt_service", service
);
247 mlt_service_attach( MLT_CONSUMER_SERVICE( obj
), filter
);
248 mlt_filter_close( filter
);
253 /** Register an object for clean up.
256 void mlt_factory_register_for_clean_up( void *ptr
, mlt_destructor destructor
)
259 sprintf( unique
, "%08d", mlt_properties_count( global_properties
) );
260 mlt_properties_set_data( global_properties
, unique
, ptr
, 0, destructor
, NULL
);
263 /** Close the factory.
266 void mlt_factory_close( )
268 if ( mlt_prefix
!= NULL
)
270 mlt_properties_close( event_object
);
271 mlt_repository_close( producers
);
272 mlt_repository_close( filters
);
273 mlt_repository_close( transitions
);
274 mlt_repository_close( consumers
);
275 mlt_properties_close( global_properties
);
276 mlt_properties_close( object_list
);