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 int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
36 mlt_filter filter = mlt_frame_pop_service( frame );
38 // Get the properties of the filter
39 mlt_properties properties = MLT_FILTER_PROPERTIES( filter );
41 mlt_service_lock( MLT_FILTER_SERVICE( filter ) );
43 // Get the region transition
44 mlt_transition transition = mlt_properties_get_data( properties, "_transition", NULL );
46 // Create the transition if not available
47 if ( transition == NULL )
49 // Create the transition
50 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( filter ) );
51 transition = mlt_factory_transition( profile, "region", NULL );
53 // Register with the filter
54 mlt_properties_set_data( properties, "_transition", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
56 // Pass a reference to this filter down
57 mlt_properties_set_data( MLT_TRANSITION_PROPERTIES( transition ), "_region_filter", filter, 0, NULL, NULL );
60 mlt_service_unlock( MLT_FILTER_SERVICE( filter ) );
62 // Pass all properties down
63 mlt_properties_inherit( MLT_TRANSITION_PROPERTIES( transition ), properties );
65 // Make the frame's position relative to this filter's in point
66 mlt_frame_set_position( frame, mlt_filter_get_position( filter, frame ) );
69 mlt_transition_process( transition, frame, NULL );
71 return mlt_frame_get_image( frame, image, format, width, height, writable );
74 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
76 mlt_frame_push_service( frame, this );
77 mlt_frame_push_get_image( frame, filter_get_image );
82 /** Constructor for the filter.
85 mlt_filter filter_region_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
87 // Create a new filter
88 mlt_filter this = mlt_filter_new( );
90 // Further initialisation
93 // Get the properties from the filter
94 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
96 // Assign the filter process method
97 this->process = filter_process;
99 // Resource defines the shape of the region
100 mlt_properties_set( properties, "resource", arg == NULL ? "rectangle" : arg );
102 // Ensure that attached filters are handled privately
103 mlt_properties_set_int( properties, "_filter_private", 1 );