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 );