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
22 #include "mlt_repository.h"
28 #define PREFIX_LIB LIBDIR "/mlt"
29 #define PREFIX_DATA PREFIX "/share/mlt"
31 /** Singleton repositories
34 static char *mlt_prefix = NULL;
35 static mlt_properties global_properties = NULL;
36 static mlt_properties object_list = NULL;
37 static mlt_repository producers = NULL;
38 static mlt_repository filters = NULL;
39 static mlt_repository transitions = NULL;
40 static mlt_repository consumers = NULL;
41 static mlt_properties event_object = NULL;
42 static int unique_id = 0;
44 /** Event transmitters.
47 static void mlt_factory_create_request( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
49 if ( listener != NULL )
50 listener( owner, this, ( char * )args[ 0 ], ( char * )args[ 1 ], ( mlt_service * )args[ 2 ] );
53 static void mlt_factory_create_done( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
55 if ( listener != NULL )
56 listener( owner, this, ( char * )args[ 0 ], ( char * )args[ 1 ], ( mlt_service )args[ 2 ] );
59 /** Construct the factories.
62 int mlt_factory_init( const char *prefix )
64 // Only initialise once
65 if ( mlt_prefix == NULL )
67 // Allow user over rides
68 if ( prefix == NULL || !strcmp( prefix, "" ) )
69 prefix = getenv( "MLT_REPOSITORY" );
71 // If no directory is specified, default to install directory
75 // Store the prefix for later retrieval
76 mlt_prefix = strdup( prefix );
78 // Initialise the pool
81 // Create and set up the events object
82 event_object = mlt_properties_new( );
83 mlt_events_init( event_object );
84 mlt_events_register( event_object, "producer-create-request", ( mlt_transmitter )mlt_factory_create_request );
85 mlt_events_register( event_object, "producer-create-done", ( mlt_transmitter )mlt_factory_create_done );
86 mlt_events_register( event_object, "filter-create-request", ( mlt_transmitter )mlt_factory_create_request );
87 mlt_events_register( event_object, "filter-create-done", ( mlt_transmitter )mlt_factory_create_done );
88 mlt_events_register( event_object, "transition-create-request", ( mlt_transmitter )mlt_factory_create_request );
89 mlt_events_register( event_object, "transition-create-done", ( mlt_transmitter )mlt_factory_create_done );
90 mlt_events_register( event_object, "consumer-create-request", ( mlt_transmitter )mlt_factory_create_request );
91 mlt_events_register( event_object, "consumer-create-done", ( mlt_transmitter )mlt_factory_create_done );
93 // Create the global properties
94 global_properties = mlt_properties_new( );
96 // Create the object list.
97 object_list = mlt_properties_new( );
99 // Create a repository for each service type
100 producers = mlt_repository_init( object_list, prefix, "producers", "mlt_create_producer" );
101 filters = mlt_repository_init( object_list, prefix, "filters", "mlt_create_filter" );
102 transitions = mlt_repository_init( object_list, prefix, "transitions", "mlt_create_transition" );
103 consumers = mlt_repository_init( object_list, prefix, "consumers", "mlt_create_consumer" );
105 // Force a clean up when app closes
106 atexit( mlt_factory_close );
109 // Allow property refresh on a subsequent initialisation
110 if ( global_properties != NULL )
112 mlt_properties_set_or_default( global_properties, "MLT_NORMALISATION", getenv( "MLT_NORMALISATION" ), "PAL" );
113 mlt_properties_set_or_default( global_properties, "MLT_PRODUCER", getenv( "MLT_PRODUCER" ), "fezzik" );
114 mlt_properties_set_or_default( global_properties, "MLT_CONSUMER", getenv( "MLT_CONSUMER" ), "sdl" );
115 mlt_properties_set( global_properties, "MLT_TEST_CARD", getenv( "MLT_TEST_CARD" ) );
116 mlt_properties_set_or_default( global_properties, "MLT_PROFILE", getenv( "MLT_PROFILE" ), "dv_pal" );
117 mlt_properties_set_or_default( global_properties, "MLT_DATA", getenv( "MLT_DATA" ), PREFIX_DATA );
124 /** Fetch the events object.
127 mlt_properties mlt_factory_event_object( )
132 /** Fetch the prefix used in this instance.
135 const char *mlt_factory_prefix( )
140 /** Get a value from the environment.
143 char *mlt_environment( const char *name )
145 if ( global_properties )
146 return mlt_properties_get( global_properties, name );
151 /** Set a value in the environment.
154 int mlt_environment_set( const char *name, const char *value )
156 if ( global_properties )
157 return mlt_properties_set( global_properties, name, value );
162 static void set_common_properties( mlt_properties properties, mlt_profile profile, const char *type, const char *service )
164 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
165 mlt_properties_set( properties, "mlt_type", type );
166 if ( mlt_properties_get_int( properties, "_mlt_service_hidden" ) == 0 )
167 mlt_properties_set( properties, "mlt_service", service );
168 if ( profile != NULL )
169 mlt_properties_set_data( properties, "_profile", profile, 0, NULL, NULL );
172 /** Fetch a producer from the repository.
175 mlt_producer mlt_factory_producer( mlt_profile profile, const char *service, void *input )
177 mlt_producer obj = NULL;
179 // Pick up the default normalising producer if necessary
180 if ( service == NULL )
181 service = mlt_environment( "MLT_PRODUCER" );
183 // Offer the application the chance to 'create'
184 mlt_events_fire( event_object, "producer-create-request", service, input, &obj, NULL );
186 // Try to instantiate via the specified service
189 obj = mlt_repository_fetch( producers, profile, producer_type, service, input );
190 mlt_events_fire( event_object, "producer-create-done", service, input, obj, NULL );
193 mlt_properties properties = MLT_PRODUCER_PROPERTIES( obj );
194 set_common_properties( properties, profile, "producer", service );
200 /** Fetch a filter from the repository.
203 mlt_filter mlt_factory_filter( mlt_profile profile, const char *service, void *input )
205 mlt_filter obj = NULL;
207 // Offer the application the chance to 'create'
208 mlt_events_fire( event_object, "filter-create-request", service, input, &obj, NULL );
212 obj = mlt_repository_fetch( filters, profile, filter_type, service, input );
213 mlt_events_fire( event_object, "filter-create-done", service, input, obj, NULL );
218 mlt_properties properties = MLT_FILTER_PROPERTIES( obj );
219 set_common_properties( properties, profile, "filter", service );
224 /** Fetch a transition from the repository.
227 mlt_transition mlt_factory_transition( mlt_profile profile, const char *service, void *input )
229 mlt_transition obj = NULL;
231 // Offer the application the chance to 'create'
232 mlt_events_fire( event_object, "transition-create-request", service, input, &obj, NULL );
236 obj = mlt_repository_fetch( transitions, profile, filter_type, service, input );
237 mlt_events_fire( event_object, "transition-create-done", service, input, obj, NULL );
242 mlt_properties properties = MLT_TRANSITION_PROPERTIES( obj );
243 set_common_properties( properties, profile, "transition", service );
248 /** Fetch a consumer from the repository
251 mlt_consumer mlt_factory_consumer( mlt_profile profile, const char *service, void *input )
253 mlt_consumer obj = NULL;
255 if ( service == NULL )
256 service = mlt_environment( "MLT_CONSUMER" );
258 // Offer the application the chance to 'create'
259 mlt_events_fire( event_object, "consumer-create-request", service, input, &obj, NULL );
263 obj = mlt_repository_fetch( consumers, profile, consumer_type, service, input );
264 mlt_events_fire( event_object, "consumer-create-done", service, input, obj, NULL );
269 mlt_properties properties = MLT_CONSUMER_PROPERTIES( obj );
270 set_common_properties( properties, profile, "consumer", service );
275 /** Register an object for clean up.
278 void mlt_factory_register_for_clean_up( void *ptr, mlt_destructor destructor )
281 sprintf( unique, "%08d", mlt_properties_count( global_properties ) );
282 mlt_properties_set_data( global_properties, unique, ptr, 0, destructor, NULL );
285 /** Close the factory.
288 void mlt_factory_close( )
290 if ( mlt_prefix != NULL )
292 mlt_properties_close( event_object );
293 mlt_repository_close( producers );
294 mlt_repository_close( filters );
295 mlt_repository_close( transitions );
296 mlt_repository_close( consumers );
297 mlt_properties_close( global_properties );
298 mlt_properties_close( object_list );