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 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 int unique_id = 0;
  40
  41 /** Construct the factories.
  42 */
  43
  44 int mlt_factory_init( char *prefix )
  45 {
  46         // Only initialise once
  47         if ( mlt_prefix == NULL )
  48         {
  49                 // If no directory is specified, default to install directory
  50                 if ( prefix == NULL )
  51                         prefix = PREFIX_DATA;
  52
  53                 // Store the prefix for later retrieval
  54                 mlt_prefix = strdup( prefix );
  55
  56                 // Initialise the pool
  57                 mlt_pool_init( );
  58
  59                 // Create the global properties
  60                 global_properties = mlt_properties_new( );
  61                 mlt_properties_set( global_properties, "MLT_NORMALISATION", getenv( "MLT_NORMALISATION" ) );
  62
  63                 // Create the object list.
  64                 object_list = mlt_properties_new( );
  65
  66                 // Create a repository for each service type
  67                 producers = mlt_repository_init( object_list, prefix, "producers.dat", "mlt_create_producer" );
  68                 filters = mlt_repository_init( object_list, prefix, "filters.dat", "mlt_create_filter" );
  69                 transitions = mlt_repository_init( object_list, prefix, "transitions.dat", "mlt_create_transition" );
  70                 consumers = mlt_repository_init( object_list, prefix, "consumers.dat", "mlt_create_consumer" );
  71         }
  72
  73         return 0;
  74 }
  75
  76 /** Fetch the prefix used in this instance.
  77 */
  78
  79 const char *mlt_factory_prefix( )
  80 {
  81         return mlt_prefix;
  82 }
  83
  84 /** Get a value from the environment.
  85 */
  86
  87 char *mlt_environment( char *name )
  88 {
  89         return mlt_properties_get( global_properties, name );
  90 }
  91
  92 /** Fetch a producer from the repository.
  93 */
  94
  95 mlt_producer mlt_factory_producer( char *service, void *input )
  96 {
  97         mlt_producer obj = mlt_repository_fetch( producers, service, input );
  98         if ( obj != NULL )
  99         {
 100                 mlt_properties properties = mlt_producer_properties( obj );
 101                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 102                 mlt_properties_set( properties, "mlt_type", "producer" );
 103                 if ( mlt_properties_get_int( properties, "_mlt_service_hidden" ) == 0 )
 104                         mlt_properties_set( properties, "mlt_service", service );
 105         }
 106         return obj;
 107 }
 108
 109 /** Fetch a filter from the repository.
 110 */
 111
 112 mlt_filter mlt_factory_filter( char *service, void *input )
 113 {
 114         mlt_filter obj = mlt_repository_fetch( filters, service, input );
 115         if ( obj != NULL )
 116         {
 117                 mlt_properties properties = mlt_filter_properties( obj );
 118                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 119                 mlt_properties_set( properties, "mlt_type", "filter" );
 120                 mlt_properties_set( properties, "mlt_service", service );
 121         }
 122         return obj;
 123 }
 124
 125 /** Fetch a transition from the repository.
 126 */
 127
 128 mlt_transition mlt_factory_transition( char *service, void *input )
 129 {
 130         mlt_transition obj = mlt_repository_fetch( transitions, service, input );
 131         if ( obj != NULL )
 132         {
 133                 mlt_properties properties = mlt_transition_properties( obj );
 134                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 135                 mlt_properties_set( properties, "mlt_type", "transition" );
 136                 mlt_properties_set( properties, "mlt_service", service );
 137         }
 138         return obj;
 139 }
 140
 141 /** Fetch a consumer from the repository
 142 */
 143
 144 mlt_consumer mlt_factory_consumer( char *service, void *input )
 145 {
 146         mlt_consumer obj = mlt_repository_fetch( consumers, service, input );
 147         if ( obj != NULL )
 148         {
 149                 mlt_properties properties = mlt_consumer_properties( obj );
 150                 mlt_properties_set_int( properties, "_unique_id", ++ unique_id );
 151                 mlt_properties_set( properties, "mlt_type", "consumer" );
 152                 mlt_properties_set( properties, "mlt_service", service );
 153         }
 154         return obj;
 155 }
 156
 157 /** Close the factory.
 158 */
 159
 160 void mlt_factory_close( )
 161 {
 162         if ( mlt_prefix != NULL )
 163         {
 164                 mlt_repository_close( producers );
 165                 mlt_repository_close( filters );
 166                 mlt_repository_close( transitions );
 167                 mlt_repository_close( consumers );
 168                 mlt_properties_close( object_list );
 169                 mlt_properties_close( global_properties );
 170                 free( mlt_prefix );
 171                 mlt_prefix = NULL;
 172                 mlt_pool_close( );
 173         }
 174 }
 175