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 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.
  10  *
  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.
  15  *
  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
  19  */
  20
  21 #include "transition_region.h"
  22
  23 #include <framework/mlt_filter.h>
  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                 mlt_profile profile = mlt_service_profile( MLT_FILTER_SERVICE( this ) );
  46                 transition = mlt_factory_transition( profile, "region", NULL );
  47
  48                 // Register with the filter
  49                 mlt_properties_set_data( properties, "_transition", transition, 0, ( mlt_destructor )mlt_transition_close, NULL );
  50
  51                 // Pass a reference to this filter down
  52                 mlt_properties_set_data( MLT_TRANSITION_PROPERTIES( transition ), "_region_filter", this, 0, NULL, NULL );
  53         }
  54
  55         // Pass all properties down
  56         mlt_properties_pass( MLT_TRANSITION_PROPERTIES( transition ), properties, "" );
  57
  58         // Process the frame
  59         return mlt_transition_process( transition, frame, NULL );
  60 }
  61
  62 /** Constructor for the filter.
  63 */
  64
  65 mlt_filter filter_region_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  66 {
  67         // Create a new filter
  68         mlt_filter this = mlt_filter_new( );
  69
  70         // Further initialisation
  71         if ( this != NULL )
  72         {
  73                 // Get the properties from the filter
  74                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  75
  76                 // Assign the filter process method
  77                 this->process = filter_process;
  78
  79                 // Resource defines the shape of the region
  80                 mlt_properties_set( properties, "resource", arg == NULL ? "rectangle" : arg );
  81
  82                 // Ensure that attached filters are handled privately
  83                 mlt_properties_set_int( properties, "_filter_private", 1 );
  84         }
  85
  86         // Return the filter
  87         return this;
  88 }
  89