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_composite.h"
  23
  24 #include <framework/mlt.h>
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 static int create_instance( mlt_filter this, char *name, char *value, int count )
  31 {
  32         // Return from this function
  33         int error = 0;
  34
  35         // Duplicate the value
  36         char *type = strdup( value );
  37
  38         // Pointer to filter argument
  39         char *arg = type == NULL ? NULL : strchr( type, ':' );
  40
  41         // New filter being created
  42         mlt_filter filter = NULL;
  43
  44         // Cleanup type and arg
  45         if ( arg != NULL )
  46                 *arg ++ = '\0';
  47
  48         // Create the filter
  49         filter = mlt_factory_filter( type, arg );
  50
  51         // If we have a filter, then initialise and store it
  52         if ( filter != NULL )
  53         {
  54                 // Properties of this
  55                 mlt_properties properties = mlt_filter_properties( this );
  56
  57                 // String to hold the property name
  58                 char id[ 256 ];
  59
  60                 // String to hold the passdown key
  61                 char key[ 256 ];
  62
  63                 // Construct id
  64                 sprintf( id, "_filter_%d", count );
  65
  66                 // Counstruct key
  67                 sprintf( key, "%s.", name );
  68
  69                 // Pass all the key properties on the filter down
  70                 mlt_properties_pass( mlt_filter_properties( filter ), properties, key );
  71
  72                 // Ensure that filter is assigned
  73                 mlt_properties_set_data( properties, id, filter, 0, ( mlt_destructor )mlt_filter_close, NULL );
  74         }
  75         else
  76         {
  77                 // Indicate that an error has occurred
  78                 error = 1;
  79         }
  80
  81         // Cleanup
  82         free( type );
  83
  84         // Return error condition
  85         return error;
  86 }
  87
  88 /** Do it :-).
  89 */
  90
  91 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  92 {
  93         // Error we will return
  94         int error = 0;
  95
  96         // Get the watermark filter object
  97         mlt_filter this = mlt_frame_pop_service( frame );
  98
  99         // Get the properties of the filter
 100         mlt_properties properties = mlt_filter_properties( this );
 101
 102         // Get the composite from the filter
 103         mlt_transition composite = mlt_properties_get_data( properties, "composite", NULL );
 104
 105         // Look for the first filter
 106         mlt_filter filter = mlt_properties_get_data( properties, "_filter_0", NULL );
 107
 108         // Create a composite if we don't have one
 109         if ( composite == NULL )
 110         {
 111                 // Create composite via the factory
 112                 composite = mlt_factory_transition( "composite", NULL );
 113
 114                 // If we have one
 115                 if ( composite != NULL )
 116                 {
 117                         // Get the properties
 118                         mlt_properties composite_properties = mlt_transition_properties( composite );
 119
 120                         // We want to ensure that we don't get a wobble...
 121                         mlt_properties_set( composite_properties, "distort", "true" );
 122                         mlt_properties_set( composite_properties, "progressive", "1" );
 123
 124                         // Pass all the composite. properties on the filter down
 125                         mlt_properties_pass( composite_properties, properties, "composite." );
 126
 127                         // Register the composite for reuse/destruction
 128                         mlt_properties_set_data( properties, "composite", composite, 0, ( mlt_destructor )mlt_transition_close, NULL );
 129                 }
 130         }
 131
 132         // Create filters
 133         if ( filter == NULL )
 134         {
 135                 // Loop Variable
 136                 int i = 0;
 137
 138                 // Number of filters created
 139                 int count = 0;
 140
 141                 // Loop for all properties
 142                 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
 143                 {
 144                         // Get the name of this property
 145                         char *name = mlt_properties_get_name( properties, i );
 146
 147                         // If the name does not contain a . and matches filter
 148                         if ( strchr( name, '.' ) == NULL && !strncmp( name, "filter", 6 ) )
 149                         {
 150                                 // Get the filter constructor
 151                                 char *value = mlt_properties_get_value( properties, i );
 152
 153                                 // Create an instance
 154                                 if ( create_instance( this, name, value, count ) == 0 )
 155                                         count ++;
 156                         }
 157                 }
 158         }
 159
 160         // Get the image
 161         error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 162
 163         // Only continue if we have both filter and composite
 164         if ( composite != NULL && filter != NULL )
 165         {
 166                 // String to hold the filter to query on
 167                 char id[ 256 ];
 168
 169                 // Index to hold the count
 170                 int i = 0;
 171
 172                 // We will get the 'b frame' from the composite
 173                 mlt_frame b_frame = composite_copy_region( composite, frame );
 174
 175                 // Make sure the filter is in the correct position
 176                 while ( filter != NULL )
 177                 {
 178                         // Stack this filter
 179                         mlt_filter_process( filter, b_frame );
 180
 181                         // Generate the key for the next
 182                         sprintf( id, "_filter_%d", ++ i );
 183
 184                         // Get the next filter
 185                         filter = mlt_properties_get_data( properties, id, NULL );
 186                 }
 187
 188                 // Get the b frame and process with composite if successful
 189                 mlt_transition_process( composite, frame, b_frame );
 190
 191                 // Get the image
 192                 error = mlt_frame_get_image( frame, image, format, width, height, 0 );
 193
 194                 // Close the b frame
 195                 mlt_frame_close( b_frame );
 196         }
 197
 198         return error;
 199 }
 200
 201 /** Filter processing.
 202 */
 203
 204 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 205 {
 206         // Push the filter on to the frame
 207         mlt_frame_push_service( frame, this );
 208
 209         // Push the filter method
 210         mlt_frame_push_get_image( frame, filter_get_image );
 211
 212         // Return the frame
 213         return frame;
 214 }
 215
 216 /** Constructor for the filter.
 217 */
 218
 219 mlt_filter filter_region_init( void *arg )
 220 {
 221         // Create a new filter
 222         mlt_filter this = mlt_filter_new( );
 223
 224         // Further initialisation
 225         if ( this != NULL )
 226         {
 227                 // Get the properties from the filter
 228                 mlt_properties properties = mlt_filter_properties( this );
 229
 230                 // Assign the filter process method
 231                 this->process = filter_process;
 232
 233                 // Resource defines the shape of the region
 234                 mlt_properties_set( properties, "resource", arg == NULL ? "rectangle" : arg );
 235         }
 236
 237         // Return the filter
 238         return this;
 239 }
 240