research.m1stereo.tv/gitweb/ - melted/blob - src/framework/mlt_factory.c

   1 /*
   2  * mlt_factory.c -- the factory method interfaces
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   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.
  10  *
  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.
  15  *
  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.
  19  */
  20
  21 #include "config.h"
  22 #include "mlt.h"
  23 #include "mlt_repository.h"
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 /** Singleton repositories
  30 */
  31
  32 static char *mlt_prefix = NULL;
  33 static mlt_properties object_list = NULL;
  34 static mlt_repository producers = NULL;
  35 static mlt_repository filters = NULL;
  36 static mlt_repository transitions = NULL;
  37 static mlt_repository consumers = NULL;
  38 static int unique_id = 0;
  39
  40 /** Construct the factories.
  41 */
  42
  43 int mlt_factory_init( char *prefix )
  44 {
  45         // Only initialise once
  46         if ( mlt_prefix == NULL )
  47         {
  48                 // If no directory is specified, default to install directory
  49                 if ( prefix == NULL )
  50                         prefix = PREFIX_DATA;
  51
  52                 // Store the prefix for later retrieval
  53                 mlt_prefix = strdup( prefix );
  54
  55                 // Initialise the pool
  56                 mlt_pool_init( );
  57
  58                 // Create the object list.
  59                 object_list = mlt_properties_new( );
  60
  61                 // Create a repository for each service type
  62                 producers = mlt_repository_init( object_list, prefix, "producers.dat", "mlt_create_producer" );
  63                 filters = mlt_repository_init( object_list, prefix, "filters.dat", "mlt_create_filter" );
  64                 transitions = mlt_repository_init( object_list, prefix, "transitions.dat", "mlt_create_transition" );
  65                 consumers = mlt_repository_init( object_list, prefix, "consumers.dat", "mlt_create_consumer" );
  66         }
  67
  68         return 0;
  69 }
  70
  71 /** Fetch the prefix used in this instance.
  72 */
  73
  74 const char *mlt_factory_prefix( )
  75 {
  76         return mlt_prefix;
  77 }
  78
  79 /** Fetch a producer from the repository.
  80 */
  81
  82 mlt_producer mlt_factory_producer( char *service, void *input )
  83 {
  84         mlt_producer obj = mlt_repository_fetch( producers, service, input );
  85         if ( obj != NULL )
  86         {
  87                 mlt_properties properties = mlt_producer_properties( obj );
  88                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
  89                 mlt_properties_set( properties, "mlt_type", "producer" );
  90                 if ( mlt_properties_get_int( properties, "_mlt_service_hidden" ) == 0 )
  91                         mlt_properties_set( properties, "mlt_service", service );
  92         }
  93         return obj;
  94 }
  95
  96 /** Fetch a filter from the repository.
  97 */
  98
  99 mlt_filter mlt_factory_filter( char *service, void *input )
 100 {
 101         mlt_filter obj = mlt_repository_fetch( filters, service, input );
 102         if ( obj != NULL )
 103         {
 104                 mlt_properties properties = mlt_filter_properties( obj );
 105                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 106                 mlt_properties_set( properties, "mlt_type", "filter" );
 107                 mlt_properties_set( properties, "mlt_service", service );
 108         }
 109         return obj;
 110 }
 111
 112 /** Fetch a transition from the repository.
 113 */
 114
 115 mlt_transition mlt_factory_transition( char *service, void *input )
 116 {
 117         mlt_transition obj = mlt_repository_fetch( transitions, service, input );
 118         if ( obj != NULL )
 119         {
 120                 mlt_properties properties = mlt_transition_properties( obj );
 121                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 122                 mlt_properties_set( properties, "mlt_type", "transition" );
 123                 mlt_properties_set( properties, "mlt_service", service );
 124         }
 125         return obj;
 126 }
 127
 128 /** Fetch a consumer from the repository
 129 */
 130
 131 mlt_consumer mlt_factory_consumer( char *service, void *input )
 132 {
 133         mlt_consumer obj = mlt_repository_fetch( consumers, service, input );
 134         if ( obj != NULL )
 135         {
 136                 mlt_properties properties = mlt_consumer_properties( obj );
 137                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 138                 mlt_properties_set( properties, "mlt_type", "consumer" );
 139                 mlt_properties_set( properties, "mlt_service", service );
 140         }
 141         return obj;
 142 }
 143
 144 /** Close the factory.
 145 */
 146
 147 void mlt_factory_close( )
 148 {
 149         if ( mlt_prefix != NULL )
 150         {
 151                 mlt_repository_close( producers );
 152                 mlt_repository_close( filters );
 153                 mlt_repository_close( transitions );
 154                 mlt_repository_close( consumers );
 155                 mlt_properties_close( object_list );
 156                 free( mlt_prefix );
 157                 mlt_prefix = NULL;
 158                 mlt_pool_close( );
 159         }
 160 }
 161