research.m1stereo.tv/gitweb/ - melted/blob - src/modules/core/filter_region.c

   1 /*
   2  * filter_region.c -- region filter
   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 "filter_region.h"
  22 #include "transition_region.h"
  23
  24 #include <framework/mlt.h>
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 /** Filter processing.
  31 */
  32
  33 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  34 {
  35         // Get the properties of the filter
  36         mlt_properties properties = mlt_filter_properties( this );
  37
  38         // Get the region transition
  39         mlt_transition transition = mlt_properties_get_data( properties, "_transition", NULL );
  40
  41         // Create the transition if not available
  42         if ( transition == NULL )
  43         {
  44                 // Create the transition
  45                 transition = mlt_factory_transition( "region", NULL );
  46
  47                 // Pass all properties down
  48                 mlt_properties_pass( mlt_transition_properties( transition ), properties, "" );
  49
  50                 // Register with the filter
  51                 mlt_properties_set_data( properties, "_transition", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
  52         }
  53
  54         // Process the frame
  55         return mlt_transition_process( transition, frame, NULL );
  56 }
  57
  58 /** Constructor for the filter.
  59 */
  60
  61 mlt_filter filter_region_init( void *arg )
  62 {
  63         // Create a new filter
  64         mlt_filter this = mlt_filter_new( );
  65
  66         // Further initialisation
  67         if ( this != NULL )
  68         {
  69                 // Get the properties from the filter
  70                 mlt_properties properties = mlt_filter_properties( this );
  71
  72                 // Assign the filter process method
  73                 this->process = filter_process;
  74
  75                 // Resource defines the shape of the region
  76                 mlt_properties_set( properties, "resource", arg == NULL ? "rectangle" : arg );
  77         }
  78
  79         // Return the filter
  80         return this;
  81 }
  82