2 * filter_region.c -- region filter
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include "transition_region.h"
23 #include <framework/mlt_filter.h>
24 #include <framework/mlt.h>
30 /** Filter processing.
33 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
35 // Get the properties of the filter
36 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
38 // Get the region transition
39 mlt_transition transition = mlt_properties_get_data( properties, "_transition", NULL );
41 // Create the transition if not available
42 if ( transition == NULL )
44 // Create the transition
45 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( this ) );
46 transition = mlt_factory_transition( profile, "region", NULL );
48 // Register with the filter
49 mlt_properties_set_data( properties, "_transition", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
51 // Pass a reference to this filter down
52 mlt_properties_set_data( MLT_TRANSITION_PROPERTIES( transition ), "_region_filter", this, 0, NULL, NULL );
55 // Pass all properties down
56 mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), properties, "" );
59 return mlt_transition_process( transition, frame, NULL );
62 /** Constructor for the filter.
65 mlt_filter filter_region_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
67 // Create a new filter
68 mlt_filter this = mlt_filter_new( );
70 // Further initialisation
73 // Get the properties from the filter
74 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
76 // Assign the filter process method
77 this->process = filter_process;
79 // Resource defines the shape of the region
80 mlt_properties_set( properties, "resource", arg == NULL ? "rectangle" : arg );
82 // Ensure that attached filters are handled privately
83 mlt_properties_set_int( properties, "_filter_private", 1 );