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