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_factory.h"
  23 #include "mlt_repository.h"
  24 #include "mlt_properties.h"
  25
  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         // If no directory is specified, default to install directory
  45         if ( prefix == NULL )
  46                 prefix = PREFIX_DATA;
  47
  48         // Store the prefix for later retrieval
  49         mlt_prefix = strdup( prefix );
  50
  51         // Create the object list.
  52         object_list = calloc( sizeof( struct mlt_properties_s ), 1 );
  53         mlt_properties_init( object_list, NULL );
  54
  55         // Create a repository for each service type
  56         producers = mlt_repository_init( object_list, prefix, "producers.dat", "mlt_create_producer" );
  57         filters = mlt_repository_init( object_list, prefix, "filters.dat", "mlt_create_filter" );
  58         transitions = mlt_repository_init( object_list, prefix, "transitions.dat", "mlt_create_transition" );
  59         consumers = mlt_repository_init( object_list, prefix, "consumers.dat", "mlt_create_consumer" );
  60
  61         return 0;
  62 }
  63
  64 /** Fetch the prefix used in this instance.
  65 */
  66
  67 const char *mlt_factory_prefix( )
  68 {
  69         return mlt_prefix;
  70 }
  71
  72 /** Fetch a producer from the repository.
  73 */
  74
  75 mlt_producer mlt_factory_producer( char *service, void *input )
  76 {
  77         return ( mlt_producer )mlt_repository_fetch( producers, service, input );
  78 }
  79
  80 /** Fetch a filter from the repository.
  81 */
  82
  83 mlt_filter mlt_factory_filter( char *service, void *input )
  84 {
  85         return ( mlt_filter )mlt_repository_fetch( filters, service, input );
  86 }
  87
  88 /** Fetch a transition from the repository.
  89 */
  90
  91 mlt_transition mlt_factory_transition( char *service, void *input )
  92 {
  93         return ( mlt_transition )mlt_repository_fetch( transitions, service, input );
  94 }
  95
  96 /** Fetch a consumer from the repository
  97 */
  98
  99 mlt_consumer mlt_factory_consumer( char *service, void *input )
 100 {
 101         return ( mlt_consumer )mlt_repository_fetch( consumers, service, input );
 102 }
 103
 104 /** Close the factory.
 105 */
 106
 107 void mlt_factory_close( )
 108 {
 109         mlt_repository_close( producers );
 110         mlt_repository_close( filters );
 111         mlt_repository_close( transitions );
 112         mlt_repository_close( consumers );
 113         mlt_properties_close( object_list );
 114         free( mlt_prefix );
 115         free( object_list );
 116 }
 117