git.sesse.net Git - mlt/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 static uint8_t *filter_get_alpha_mask( mlt_frame this )
  89 {
  90         // Obtain properties of frame
  91         mlt_properties properties = mlt_frame_properties( this );
  92
  93         // Return the alpha mask
  94         return mlt_properties_get_data( properties, "alpha", NULL );
  95 }
  96
  97 /** Do it :-).
  98 */
  99
 100 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 101 {
 102         // Error we will return
 103         int error = 0;
 104
 105         // Get the watermark filter object
 106         mlt_filter this = mlt_frame_pop_service( frame );
 107
 108         // Get the properties of the filter
 109         mlt_properties properties = mlt_filter_properties( this );
 110
 111         // Get the composite from the filter
 112         mlt_transition composite = mlt_properties_get_data( properties, "composite", NULL );
 113
 114         // Look for the first filter
 115         mlt_filter filter = mlt_properties_get_data( properties, "_filter_0", NULL );
 116
 117         // Create a composite if we don't have one
 118         if ( composite == NULL )
 119         {
 120                 // Create composite via the factory
 121                 composite = mlt_factory_transition( "composite", NULL );
 122
 123                 // If we have one
 124                 if ( composite != NULL )
 125                 {
 126                         // Get the properties
 127                         mlt_properties composite_properties = mlt_transition_properties( composite );
 128
 129                         // We want to ensure that we don't get a wobble...
 130                         mlt_properties_set( composite_properties, "distort", "true" );
 131                         mlt_properties_set( composite_properties, "progressive", "1" );
 132
 133                         // Pass all the composite. properties on the filter down
 134                         mlt_properties_pass( composite_properties, properties, "composite." );
 135
 136                         // Register the composite for reuse/destruction
 137                         mlt_properties_set_data( properties, "composite", composite, 0, ( mlt_destructor )mlt_transition_close, NULL );
 138                 }
 139         }
 140
 141         // Create filters
 142         if ( filter == NULL )
 143         {
 144                 // Loop Variable
 145                 int i = 0;
 146
 147                 // Number of filters created
 148                 int count = 0;
 149
 150                 // Loop for all properties
 151                 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
 152                 {
 153                         // Get the name of this property
 154                         char *name = mlt_properties_get_name( properties, i );
 155
 156                         // If the name does not contain a . and matches filter
 157                         if ( strchr( name, '.' ) == NULL && !strncmp( name, "filter", 6 ) )
 158                         {
 159                                 // Get the filter constructor
 160                                 char *value = mlt_properties_get_value( properties, i );
 161
 162                                 // Create an instance
 163                                 if ( create_instance( this, name, value, count ) == 0 )
 164                                         count ++;
 165                         }
 166                 }
 167         }
 168
 169         // Get the image
 170         error = mlt_frame_get_image( frame, image, format, width, height, 1 );
 171
 172         // Only continue if we have both filter and composite
 173         if ( composite != NULL && filter != NULL )
 174         {
 175                 // String to hold the filter to query on
 176                 char id[ 256 ];
 177
 178                 // Index to hold the count
 179                 int i = 0;
 180
 181                 // We will get the 'b frame' from the composite
 182                 mlt_frame b_frame = composite_copy_region( composite, frame );
 183
 184                 // Make sure the filter is in the correct position
 185                 while ( filter != NULL )
 186                 {
 187                         // Stack this filter
 188                         mlt_filter_process( filter, b_frame );
 189
 190                         // Generate the key for the next
 191                         sprintf( id, "_filter_%d", ++ i );
 192
 193                         // Get the next filter
 194                         filter = mlt_properties_get_data( properties, id, NULL );
 195                 }
 196
 197                 // Get the b frame and process with composite if successful
 198                 mlt_transition_process( composite, frame, b_frame );
 199
 200                 // See if we have a shape producer
 201                 // Copy the alpha mask from the shape frame to the b_frame
 202                 char *resource =  mlt_properties_get( properties, "resource" );
 203
 204                 if ( strcmp( resource, "rectangle" ) != 0 )
 205                 {
 206                         if ( strcmp( resource, "circle" ) == 0 )
 207                         {
 208                                 resource = strdup( "pixbuf" );
 209                                 mlt_properties_set( properties, "producer.resource", "<svg width='100' height='100'><circle cx='50' cy='50' r='50' fill='black'/></svg>" );
 210                         }
 211
 212                         // Get the producer from the filter
 213                         mlt_producer producer = mlt_properties_get_data( properties, "producer", NULL );
 214
 215                         if ( producer == NULL )
 216                         {
 217                                 // Get the factory producer service
 218                                 char *factory = mlt_properties_get( properties, "factory" );
 219
 220                                 // Create the producer
 221                                 producer = mlt_factory_producer( factory, resource );
 222
 223                                 // If we have one
 224                                 if ( producer != NULL )
 225                                 {
 226                                         // Get the producer properties
 227                                         mlt_properties producer_properties = mlt_producer_properties( producer );
 228
 229                                         // Ensure that we loop
 230                                         mlt_properties_set( producer_properties, "eof", "loop" );
 231
 232                                         // Now pass all producer. properties on the filter down
 233                                         mlt_properties_pass( producer_properties, properties, "producer." );
 234
 235                                         // Register the producer for reuse/destruction
 236                                         mlt_properties_set_data( properties, "producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 237                                 }
 238                         }
 239
 240                         if ( producer != NULL )
 241                         {
 242                                 // We will get the alpha frame from the producer
 243                                 mlt_frame shape_frame = NULL;
 244
 245                                 // Get the unique id of the filter (used to reacquire the producer position)
 246                                 char *name = mlt_properties_get( properties, "_unique_id" );
 247
 248                                 // Get the original producer position
 249                                 mlt_position position = mlt_properties_get_position( mlt_frame_properties( frame ), name );
 250
 251                                 // Make sure the producer is in the correct position
 252                                 mlt_producer_seek( producer, position );
 253
 254                                 // Get the shape frame
 255                                 if ( mlt_service_get_frame( mlt_producer_service( producer ), &shape_frame, 0 ) == 0 )
 256                                 {
 257                                         int region_width = mlt_properties_get_int( mlt_frame_properties( b_frame ), "width" );
 258                                         int region_height = mlt_properties_get_int( mlt_frame_properties( b_frame ), "height" );
 259
 260                                         // Get the shape image to trigger alpha creation
 261                                         mlt_properties_set( mlt_frame_properties( shape_frame ), "distort", "true" );
 262                                         error = mlt_frame_get_image( shape_frame, image, format, &region_width, &region_height, 1 );
 263
 264                                         // Only override any existing b_frame alpha if the shape has an alpha
 265                                         if ( mlt_frame_get_alpha_mask( shape_frame ) != NULL )
 266                                         {
 267                                                 // Set the b_frame alpha from the shape frame
 268                                                 mlt_properties_set_data( mlt_frame_properties( b_frame ), "alpha", mlt_frame_get_alpha_mask( shape_frame ), 0 , NULL, NULL );
 269                                                 b_frame->get_alpha_mask = filter_get_alpha_mask;
 270                                         }
 271
 272                                         // Get the image
 273                                         error = mlt_frame_get_image( frame, image, format, width, height, 0 );
 274
 275                                         // Close the b frame
 276                                         mlt_frame_close( b_frame );
 277                                         b_frame = NULL;
 278
 279                                         // Close the shape frame
 280                                         mlt_frame_close( shape_frame );
 281                                 }
 282                         }
 283                 }
 284                 if ( b_frame != NULL )
 285                 {
 286                         // Get the image
 287                         error = mlt_frame_get_image( frame, image, format, width, height, 0 );
 288
 289                         // Close the b frame
 290                         mlt_frame_close( b_frame );
 291                 }
 292         }
 293
 294         return error;
 295 }
 296
 297 /** Filter processing.
 298 */
 299
 300 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 301 {
 302         // Push the filter on to the frame
 303         mlt_frame_push_service( frame, this );
 304
 305         // Push the filter method
 306         mlt_frame_push_get_image( frame, filter_get_image );
 307
 308         // Return the frame
 309         return frame;
 310 }
 311
 312 /** Constructor for the filter.
 313 */
 314
 315 mlt_filter filter_region_init( void *arg )
 316 {
 317         // Create a new filter
 318         mlt_filter this = mlt_filter_new( );
 319
 320         // Further initialisation
 321         if ( this != NULL )
 322         {
 323                 // Get the properties from the filter
 324                 mlt_properties properties = mlt_filter_properties( this );
 325
 326                 // Assign the filter process method
 327                 this->process = filter_process;
 328
 329                 mlt_properties_set( properties, "factory", "fezzik" );
 330
 331                 // Resource defines the shape of the region
 332                 mlt_properties_set( properties, "resource", arg == NULL ? "rectangle" : arg );
 333         }
 334
 335         // Return the filter
 336         return this;
 337 }
 338