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                 // Create the object list.
  55                 object_list = mlt_properties_new( );
  56
  57                 // Create a repository for each service type
  58                 producers = mlt_repository_init( object_list, prefix, "producers.dat", "mlt_create_producer" );
  59                 filters = mlt_repository_init( object_list, prefix, "filters.dat", "mlt_create_filter" );
  60                 transitions = mlt_repository_init( object_list, prefix, "transitions.dat", "mlt_create_transition" );
  61                 consumers = mlt_repository_init( object_list, prefix, "consumers.dat", "mlt_create_consumer" );
  62         }
  63
  64         return 0;
  65 }
  66
  67 /** Fetch the prefix used in this instance.
  68 */
  69
  70 const char *mlt_factory_prefix( )
  71 {
  72         return mlt_prefix;
  73 }
  74
  75 /** Fetch a producer from the repository.
  76 */
  77
  78 mlt_producer mlt_factory_producer( char *service, void *input )
  79 {
  80         mlt_producer obj = mlt_repository_fetch( producers, service, input );
  81         if ( obj != NULL )
  82         {
  83                 mlt_properties properties = mlt_producer_properties( obj );
  84                 mlt_properties_set( properties, "mlt_type", "producer" );
  85                 if ( mlt_properties_get_int( properties, "_mlt_service_hidden" ) == 0 )
  86                         mlt_properties_set( properties, "mlt_service", service );
  87         }
  88         return obj;
  89 }
  90
  91 /** Fetch a filter from the repository.
  92 */
  93
  94 mlt_filter mlt_factory_filter( char *service, void *input )
  95 {
  96         mlt_filter obj = mlt_repository_fetch( filters, service, input );
  97         if ( obj != NULL )
  98         {
  99                 mlt_properties properties = mlt_filter_properties( obj );
 100                 mlt_properties_set( properties, "mlt_type", "filter" );
 101                 mlt_properties_set( properties, "mlt_service", service );
 102         }
 103         return obj;
 104 }
 105
 106 /** Fetch a transition from the repository.
 107 */
 108
 109 mlt_transition mlt_factory_transition( char *service, void *input )
 110 {
 111         mlt_transition obj = mlt_repository_fetch( transitions, service, input );
 112         if ( obj != NULL )
 113         {
 114                 mlt_properties properties = mlt_transition_properties( obj );
 115                 mlt_properties_set( properties, "mlt_type", "transition" );
 116                 mlt_properties_set( properties, "mlt_service", service );
 117         }
 118         return obj;
 119 }
 120
 121 /** Fetch a consumer from the repository
 122 */
 123
 124 mlt_consumer mlt_factory_consumer( char *service, void *input )
 125 {
 126         mlt_consumer obj = mlt_repository_fetch( consumers, service, input );
 127         if ( obj != NULL )
 128         {
 129                 mlt_properties properties = mlt_consumer_properties( obj );
 130                 mlt_properties_set( properties, "mlt_type", "consumer" );
 131                 mlt_properties_set( properties, "mlt_service", service );
 132         }
 133         return obj;
 134 }
 135
 136 /** Close the factory.
 137 */
 138
 139 void mlt_factory_close( )
 140 {
 141         if ( mlt_prefix != NULL )
 142         {
 143                 mlt_repository_close( producers );
 144                 mlt_repository_close( filters );
 145                 mlt_repository_close( transitions );
 146                 mlt_repository_close( consumers );
 147                 mlt_properties_close( object_list );
 148                 free( mlt_prefix );
 149                 mlt_prefix = NULL;
 150         }
 151 }
 152