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 library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, 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( const 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( );
94 // Create the object list.
95 object_list = mlt_properties_new( );
97 // Create a repository for each service type
98 producers = mlt_repository_init( object_list, prefix, "producers", "mlt_create_producer" );
99 filters = mlt_repository_init( object_list, prefix, "filters", "mlt_create_filter" );
100 transitions = mlt_repository_init( object_list, prefix, "transitions", "mlt_create_transition" );
101 consumers = mlt_repository_init( object_list, prefix, "consumers", "mlt_create_consumer" );
103 // Force a clean up when app closes
104 atexit( mlt_factory_close );
107 // Allow property refresh on a subsequent initialisation
108 if ( global_properties != NULL )
110 mlt_properties_set_or_default( global_properties, "MLT_NORMALISATION", getenv( "MLT_NORMALISATION" ), "PAL" );
111 mlt_properties_set_or_default( global_properties, "MLT_PRODUCER", getenv( "MLT_PRODUCER" ), "fezzik" );
112 mlt_properties_set_or_default( global_properties, "MLT_CONSUMER", getenv( "MLT_CONSUMER" ), "sdl" );
113 mlt_properties_set( global_properties, "MLT_TEST_CARD", getenv( "MLT_TEST_CARD" ) );
114 mlt_properties_set_or_default( global_properties, "MLT_PROFILE", getenv( "MLT_PROFILE" ), "dv_pal" );
121 /** Fetch the events object.
124 mlt_properties mlt_factory_event_object( )
129 /** Fetch the prefix used in this instance.
132 const char *mlt_factory_prefix( )
137 /** Get a value from the environment.
140 char *mlt_environment( const char *name )
142 return mlt_properties_get( global_properties, name );
145 /** Set a value in the environment.
148 int mlt_environment_set( const char *name, const char *value )
150 return mlt_properties_set( global_properties, name, value );
153 static void set_common_properties( mlt_properties properties, mlt_profile profile, const char *type, const char *service )
155 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
156 mlt_properties_set( properties, "mlt_type", type );
157 if ( mlt_properties_get_int( properties, "_mlt_service_hidden" ) == 0 )
158 mlt_properties_set( properties, "mlt_service", service );
159 if ( profile != NULL )
160 mlt_properties_set_data( properties, "_profile", profile, 0, NULL, NULL );
163 /** Fetch a producer from the repository.
166 mlt_producer mlt_factory_producer( mlt_profile profile, const char *service, void *input )
168 mlt_producer obj = NULL;
170 // Pick up the default normalising producer if necessary
171 if ( service == NULL )
172 service = mlt_environment( "MLT_PRODUCER" );
174 // Offer the application the chance to 'create'
175 mlt_events_fire( event_object, "producer-create-request", service, input, &obj, NULL );
177 // Try to instantiate via the specified service
180 obj = mlt_repository_fetch( producers, profile, producer_type, service, input );
181 mlt_events_fire( event_object, "producer-create-done", service, input, obj, NULL );
184 mlt_properties properties = MLT_PRODUCER_PROPERTIES( obj );
185 set_common_properties( properties, profile, "producer", service );
191 /** Fetch a filter from the repository.
194 mlt_filter mlt_factory_filter( mlt_profile profile, const char *service, void *input )
196 mlt_filter obj = NULL;
198 // Offer the application the chance to 'create'
199 mlt_events_fire( event_object, "filter-create-request", service, input, &obj, NULL );
203 obj = mlt_repository_fetch( filters, profile, filter_type, service, input );
204 mlt_events_fire( event_object, "filter-create-done", service, input, obj, NULL );
209 mlt_properties properties = MLT_FILTER_PROPERTIES( obj );
210 set_common_properties( properties, profile, "filter", service );
215 /** Fetch a transition from the repository.
218 mlt_transition mlt_factory_transition( mlt_profile profile, const char *service, void *input )
220 mlt_transition obj = NULL;
222 // Offer the application the chance to 'create'
223 mlt_events_fire( event_object, "transition-create-request", service, input, &obj, NULL );
227 obj = mlt_repository_fetch( transitions, profile, filter_type, service, input );
228 mlt_events_fire( event_object, "transition-create-done", service, input, obj, NULL );
233 mlt_properties properties = MLT_TRANSITION_PROPERTIES( obj );
234 set_common_properties( properties, profile, "transition", service );
239 /** Fetch a consumer from the repository
242 mlt_consumer mlt_factory_consumer( mlt_profile profile, const char *service, void *input )
244 mlt_consumer obj = NULL;
246 if ( service == NULL )
247 service = mlt_environment( "MLT_CONSUMER" );
249 // Offer the application the chance to 'create'
250 mlt_events_fire( event_object, "consumer-create-request", service, input, &obj, NULL );
254 obj = mlt_repository_fetch( consumers, profile, consumer_type, service, input );
255 mlt_events_fire( event_object, "consumer-create-done", service, input, obj, NULL );
260 mlt_properties properties = MLT_CONSUMER_PROPERTIES( obj );
261 set_common_properties( properties, profile, "consumer", service );
266 /** Register an object for clean up.
269 void mlt_factory_register_for_clean_up( void *ptr, mlt_destructor destructor )
272 sprintf( unique, "%08d", mlt_properties_count( global_properties ) );
273 mlt_properties_set_data( global_properties, unique, ptr, 0, destructor, NULL );
276 /** Close the factory.
279 void mlt_factory_close( )
281 if ( mlt_prefix != NULL )
283 mlt_properties_close( event_object );
284 mlt_repository_close( producers );
285 mlt_repository_close( filters );
286 mlt_repository_close( transitions );
287 mlt_repository_close( consumers );
288 mlt_properties_close( global_properties );
289 mlt_properties_close( object_list );