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

   1 /*
   2  * transition_luma.c -- a generic dissolve/wipe processor
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   6  * Adapted from Kino Plugin Timfx, which is
   7  * Copyright (C) 2002 Timothy M. Shead <tshead@k-3d.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include <framework/mlt.h>
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <ctype.h>
  29 #include <string.h>
  30 #include <math.h>
  31
  32 /** Calculate the position for this frame.
  33 */
  34
  35 static float position_calculate( mlt_transition this, mlt_frame frame )
  36 {
  37         // Get the in and out position
  38         mlt_position in = mlt_transition_get_in( this );
  39         mlt_position out = mlt_transition_get_out( this );
  40
  41         // Get the position of the frame
  42         char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( this ), "_unique_id" );
  43         mlt_position position = mlt_properties_get_position( MLT_FRAME_PROPERTIES( frame ), name );
  44
  45         // Now do the calcs
  46         return ( float )( position - in ) / ( float )( out - in + 1 );
  47 }
  48
  49 /** Calculate the field delta for this frame - position between two frames.
  50 */
  51
  52 static float delta_calculate( mlt_transition this, mlt_frame frame )
  53 {
  54         // Get the in and out position
  55         mlt_position in = mlt_transition_get_in( this );
  56         mlt_position out = mlt_transition_get_out( this );
  57
  58         // Get the position of the frame
  59         mlt_position position = mlt_frame_get_position( frame );
  60
  61         // Now do the calcs
  62         float x = ( float )( position - in ) / ( float )( out - in + 1 );
  63         float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
  64
  65         return ( y - x ) / 2.0;
  66 }
  67
  68 static inline int dissolve_yuv( mlt_frame this, mlt_frame that, float weight, int width, int height )
  69 {
  70         int ret = 0;
  71         int width_src = width, height_src = height;
  72         mlt_image_format format = mlt_image_yuv422;
  73         uint8_t *p_src, *p_dest;
  74         uint8_t *p, *q;
  75         uint8_t *limit;
  76         uint8_t *alpha_src;
  77         uint8_t *alpha_dst;
  78
  79         int32_t weigh = weight * ( 1 << 16 );
  80         int32_t weigh_complement = ( 1 - weight ) * ( 1 << 16 );
  81
  82         if ( mlt_properties_get( &this->parent, "distort" ) )
  83                 mlt_properties_set( &that->parent, "distort", mlt_properties_get( &this->parent, "distort" ) );
  84         mlt_properties_set_int( &that->parent, "consumer_deinterlace", mlt_properties_get_int( &this->parent, "consumer_deinterlace" ) );
  85         mlt_frame_get_image( this, &p_dest, &format, &width, &height, 1 );
  86         alpha_dst = mlt_frame_get_alpha_mask( this );
  87         mlt_frame_get_image( that, &p_src, &format, &width_src, &height_src, 0 );
  88         alpha_src = mlt_frame_get_alpha_mask( that );
  89
  90         // Pick the lesser of two evils ;-)
  91         width_src = width_src > width ? width : width_src;
  92         height_src = height_src > height ? height : height_src;
  93
  94         p = p_dest;
  95         q = alpha_dst;
  96         limit = p_dest + height_src * width_src * 2;
  97
  98         while ( p < limit )
  99         {
 100                 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
 101                 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
 102                 *alpha_dst++ = ( *alpha_src++ * weigh + *q++ * weigh_complement ) >> 16;
 103         }
 104
 105         return ret;
 106 }
 107
 108 // image processing functions
 109
 110 static inline int32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
 111 {
 112         if ( a < edge1 )
 113                 return 0;
 114
 115         if ( a >= edge2 )
 116                 return 0x10000;
 117
 118         a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
 119
 120         return ( ( ( a * a ) >> 16 )  * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
 121 }
 122
 123 /** powerful stuff
 124
 125     \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
 126 */
 127 static void luma_composite( mlt_frame a_frame, mlt_frame b_frame, int luma_width, int luma_height,
 128                                                         uint16_t *luma_bitmap, float pos, float frame_delta, float softness, int field_order,
 129                                                         int *width, int *height )
 130 {
 131         int width_src = *width, height_src = *height;
 132         int width_dest = *width, height_dest = *height;
 133         mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
 134         uint8_t *p_src, *p_dest;
 135         int i, j;
 136         int stride_src;
 137         int stride_dest;
 138         uint16_t weight = 0;
 139
 140         format_src = mlt_image_yuv422;
 141         format_dest = mlt_image_yuv422;
 142
 143         if ( mlt_properties_get( &a_frame->parent, "distort" ) )
 144                 mlt_properties_set( &b_frame->parent, "distort", mlt_properties_get( &a_frame->parent, "distort" ) );
 145         mlt_properties_set_int( &b_frame->parent, "consumer_deinterlace", mlt_properties_get_int( &a_frame->parent, "consumer_deinterlace" ) );
 146         mlt_frame_get_image( a_frame, &p_dest, &format_dest, &width_dest, &height_dest, 1 );
 147         mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 );
 148
 149         if ( *width == 0 || *height == 0 )
 150                 return;
 151
 152         // Pick the lesser of two evils ;-)
 153         width_src = width_src > width_dest ? width_dest : width_src;
 154         height_src = height_src > height_dest ? height_dest : height_src;
 155
 156         stride_src = width_src * 2;
 157         stride_dest = width_dest * 2;
 158
 159         // Offset the position based on which field we're looking at ...
 160         int32_t field_pos[ 2 ];
 161         field_pos[ 0 ] = ( pos + ( ( field_order == 0 ? 1 : 0 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
 162         field_pos[ 1 ] = ( pos + ( ( field_order == 0 ? 0 : 1 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
 163
 164         register uint8_t *p;
 165         register uint8_t *q;
 166         register uint8_t *o;
 167         uint16_t  *l;
 168
 169         uint32_t value;
 170
 171         int32_t x_diff = ( luma_width << 16 ) / *width;
 172         int32_t y_diff = ( luma_height << 16 ) / *height;
 173         int32_t x_offset = 0;
 174         int32_t y_offset = 0;
 175         uint8_t *p_row;
 176         uint8_t *q_row;
 177
 178         int32_t i_softness = softness * ( 1 << 16 );
 179
 180         int field_count = field_order < 0 ? 1 : 2;
 181         int field_stride_src = field_count * stride_src;
 182         int field_stride_dest = field_count * stride_dest;
 183         int field = 0;
 184
 185         // composite using luma map
 186         while ( field < field_count )
 187         {
 188                 p_row = p_src + field * stride_src;
 189                 q_row = p_dest + field * stride_dest;
 190                 y_offset = field << 16;
 191                 i = field;
 192
 193                 while ( i < height_src )
 194                 {
 195                         p = p_row;
 196                         q = q_row;
 197                         o = q;
 198                         l = luma_bitmap + ( y_offset >> 16 ) * ( luma_width * field_count );
 199                         x_offset = 0;
 200                         j = width_src;
 201
 202                         while( j -- )
 203                         {
 204                 weight = l[ x_offset >> 16 ];
 205                                 value = smoothstep( weight, i_softness + weight, field_pos[ field ] );
 206                                 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 207                                 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 208                                 x_offset += x_diff;
 209                         }
 210
 211                         y_offset += y_diff;
 212                         i += field_count;
 213                         p_row += field_stride_src;
 214                         q_row += field_stride_dest;
 215                 }
 216
 217                 field ++;
 218         }
 219 }
 220
 221 /** Load the luma map from PGM stream.
 222 */
 223
 224 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
 225 {
 226         uint8_t *data = NULL;
 227         while (1)
 228         {
 229                 char line[128];
 230                 char comment[128];
 231                 int i = 2;
 232                 int maxval;
 233                 int bpp;
 234                 uint16_t *p;
 235
 236                 line[127] = '\0';
 237
 238                 // get the magic code
 239                 if ( fgets( line, 127, f ) == NULL )
 240                         break;
 241
 242                 // skip comments
 243                 while ( sscanf( line, " #%s", comment ) > 0 )
 244                         if ( fgets( line, 127, f ) == NULL )
 245                                 break;
 246
 247                 if ( line[0] != 'P' || line[1] != '5' )
 248                         break;
 249
 250                 // skip white space and see if a new line must be fetched
 251                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 252                 if ( ( line[i] == '\0' || line[i] == '#' ) && fgets( line, 127, f ) == NULL )
 253                         break;
 254
 255                 // skip comments
 256                 while ( sscanf( line, " #%s", comment ) > 0 )
 257                         if ( fgets( line, 127, f ) == NULL )
 258                                 break;
 259
 260                 // get the dimensions
 261                 if ( line[0] == 'P' )
 262                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 263                 else
 264                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 265
 266                 // get the height value, if not yet
 267                 if ( i < 2 )
 268                 {
 269                         if ( fgets( line, 127, f ) == NULL )
 270                                 break;
 271
 272                         // skip comments
 273                         while ( sscanf( line, " #%s", comment ) > 0 )
 274                                 if ( fgets( line, 127, f ) == NULL )
 275                                         break;
 276
 277                         i = sscanf( line, "%d", height );
 278                         if ( i == 0 )
 279                                 break;
 280                         else
 281                                 i = 2;
 282                 }
 283
 284                 // get the maximum gray value, if not yet
 285                 if ( i < 3 )
 286                 {
 287                         if ( fgets( line, 127, f ) == NULL )
 288                                 break;
 289
 290                         // skip comments
 291                         while ( sscanf( line, " #%s", comment ) > 0 )
 292                                 if ( fgets( line, 127, f ) == NULL )
 293                                         break;
 294
 295                         i = sscanf( line, "%d", &maxval );
 296                         if ( i == 0 )
 297                                 break;
 298                 }
 299
 300                 // determine if this is one or two bytes per pixel
 301                 bpp = maxval > 255 ? 2 : 1;
 302
 303                 // allocate temporary storage for the raw data
 304                 data = mlt_pool_alloc( *width * *height * bpp );
 305                 if ( data == NULL )
 306                         break;
 307
 308                 // read the raw data
 309                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 310                         break;
 311
 312                 // allocate the luma bitmap
 313                 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
 314                 if ( *map == NULL )
 315                         break;
 316
 317                 // proces the raw data into the luma bitmap
 318                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 319                 {
 320                         if ( bpp == 1 )
 321                                 *p++ = data[ i ] << 8;
 322                         else
 323                                 *p++ = ( data[ i ] << 8 ) + data[ i+1 ];
 324                 }
 325
 326                 break;
 327         }
 328
 329         if ( data != NULL )
 330                 mlt_pool_release( data );
 331 }
 332
 333 /** Generate a luma map from an RGB image.
 334 */
 335
 336 static void luma_read_yuv422( uint8_t *image, uint16_t **map, int width, int height )
 337 {
 338         int i;
 339         int size = width * height * 2;
 340
 341         // allocate the luma bitmap
 342         uint16_t *p = *map = ( uint16_t* )mlt_pool_alloc( width * height * sizeof( uint16_t ) );
 343         if ( *map == NULL )
 344                 return;
 345
 346         // proces the image data into the luma bitmap
 347         for ( i = 0; i < size; i += 2 )
 348                 *p++ = ( image[ i ] - 16 ) * 299; // 299 = 65535 / 219
 349 }
 350
 351 /** Generate a luma map from a YUV image.
 352 */
 353 static void luma_read_rgb24( uint8_t *image, uint16_t **map, int width, int height )
 354 {
 355 }
 356
 357 /** Get the image.
 358 */
 359
 360 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 361 {
 362         // Get the b frame from the stack
 363         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
 364
 365         // Get the transition object
 366         mlt_transition transition = mlt_frame_pop_service( a_frame );
 367
 368         // Get the properties of the transition
 369         mlt_properties properties = MLT_TRANSITION_PROPERTIES( transition );
 370
 371         // Get the properties of the a frame
 372         mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
 373
 374         // Get the properties of the b frame
 375         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 376
 377         // This compositer is yuv422 only
 378         *format = mlt_image_yuv422;
 379
 380         // The cached luma map information
 381         int luma_width = mlt_properties_get_int( properties, "width" );
 382         int luma_height = mlt_properties_get_int( properties, "height" );
 383         uint16_t *luma_bitmap = mlt_properties_get_data( properties, "bitmap", NULL );
 384         char *current_resource = mlt_properties_get( properties, "_resource" );
 385
 386         // If the filename property changed, reload the map
 387         char *resource = mlt_properties_get( properties, "resource" );
 388
 389         // Correct width/height if not specified
 390         if ( luma_width == 0 || luma_height == 0 )
 391         {
 392                 luma_width = mlt_properties_get_int( a_props, "width" );
 393                 luma_height = mlt_properties_get_int( a_props, "height" );
 394         }
 395
 396         if ( resource != current_resource )
 397         {
 398                 char temp[ 512 ];
 399                 char *extension = strrchr( resource, '.' );
 400
 401                 if ( strchr( resource, '%' ) )
 402                 {
 403                         FILE *test;
 404                         sprintf( temp, "%s/lumas/%s/%s", mlt_environment( "MLT_DATA" ), mlt_environment( "MLT_NORMALISATION" ), strchr( resource, '%' ) + 1 );
 405                         test = fopen( temp, "r" );
 406                         if ( test == NULL )
 407                                 strcat( temp, ".png" );
 408                         else
 409                                 fclose( test );
 410                         resource = temp;
 411                         extension = strrchr( resource, '.' );
 412                 }
 413
 414                 // See if it is a PGM
 415                 if ( extension != NULL && strcmp( extension, ".pgm" ) == 0 )
 416                 {
 417                         // Open PGM
 418                         FILE *f = fopen( resource, "r" );
 419                         if ( f != NULL )
 420                         {
 421                                 // Load from PGM
 422                                 luma_read_pgm( f, &luma_bitmap, &luma_width, &luma_height );
 423                                 fclose( f );
 424
 425                                 // Set the transition properties
 426                                 mlt_properties_set_int( properties, "width", luma_width );
 427                                 mlt_properties_set_int( properties, "height", luma_height );
 428                                 mlt_properties_set( properties, "_resource", resource );
 429                                 mlt_properties_set_data( properties, "bitmap", luma_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
 430                         }
 431                 }
 432                 else if (!*resource)
 433                 {
 434                     luma_bitmap = NULL;
 435                     mlt_properties_set( properties, "_resource", NULL );
 436                     mlt_properties_set_data( properties, "bitmap", luma_bitmap, 0, mlt_pool_release, NULL );
 437                 }
 438                 else
 439                 {
 440                         // Get the factory producer service
 441                         char *factory = mlt_properties_get( properties, "factory" );
 442
 443                         // Create the producer
 444                         mlt_profile profile = mlt_service_profile( MLT_TRANSITION_SERVICE( transition ) );
 445                         mlt_producer producer = mlt_factory_producer( profile, factory, resource );
 446
 447                         // If we have one
 448                         if ( producer != NULL )
 449                         {
 450                                 // Get the producer properties
 451                                 mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 452
 453                                 // Ensure that we loop
 454                                 mlt_properties_set( producer_properties, "eof", "loop" );
 455
 456                                 // Now pass all producer. properties on the transition down
 457                                 mlt_properties_pass( producer_properties, properties, "producer." );
 458
 459                                 // We will get the alpha frame from the producer
 460                                 mlt_frame luma_frame = NULL;
 461
 462                                 // Get the luma frame
 463                                 if ( mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &luma_frame, 0 ) == 0 )
 464                                 {
 465                                         uint8_t *luma_image = NULL;
 466                                         mlt_image_format luma_format = mlt_image_yuv422;
 467
 468                                         // Get image from the luma producer
 469                                         mlt_properties_set( MLT_FRAME_PROPERTIES( luma_frame ), "rescale.interp", "nearest" );
 470                                         mlt_frame_get_image( luma_frame, &luma_image, &luma_format, &luma_width, &luma_height, 0 );
 471
 472                                         // Generate the luma map
 473                                         if ( luma_image != NULL && luma_format == mlt_image_yuv422 )
 474                                                 luma_read_yuv422( luma_image, &luma_bitmap, luma_width, luma_height );
 475
 476                                         else if ( luma_image != NULL && luma_format == mlt_image_rgb24 )
 477                                                 luma_read_rgb24( luma_image, &luma_bitmap, luma_width, luma_height );
 478
 479                                         // Set the transition properties
 480                                         mlt_properties_set_int( properties, "width", luma_width );
 481                                         mlt_properties_set_int( properties, "height", luma_height );
 482                                         mlt_properties_set( properties, "_resource", resource);
 483                                         mlt_properties_set_data( properties, "bitmap", luma_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
 484
 485                                         // Cleanup the luma frame
 486                                         mlt_frame_close( luma_frame );
 487                                 }
 488
 489                                 // Cleanup the luma producer
 490                                 mlt_producer_close( producer );
 491                         }
 492                 }
 493         }
 494
 495         // Arbitrary composite defaults
 496         float mix = position_calculate( transition, a_frame );
 497         float frame_delta = delta_calculate( transition, a_frame );
 498
 499         float luma_softness = mlt_properties_get_double( properties, "softness" );
 500         int progressive =
 501                         mlt_properties_get_int( a_props, "consumer_deinterlace" ) ||
 502                         mlt_properties_get_int( properties, "progressive" ) ||
 503                         mlt_properties_get_int( b_props, "luma.progressive" );
 504         int top_field_first =  mlt_properties_get_int( b_props, "top_field_first" );
 505         int reverse = mlt_properties_get_int( properties, "reverse" );
 506         int invert = mlt_properties_get_int( properties, "invert" );
 507
 508         if ( mlt_properties_get( a_props, "rescale.interp" ) == NULL || !strcmp( mlt_properties_get( a_props, "rescale.interp" ), "none" ) )
 509                 mlt_properties_set( a_props, "rescale.interp", "nearest" );
 510
 511         // Since we are the consumer of the b_frame, we must pass along this
 512         // consumer property from the a_frame
 513         if ( mlt_properties_get_double( a_props, "aspect_ratio" ) == 0.0 )
 514                 mlt_properties_set_double( a_props, "aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 515         if ( mlt_properties_get_double( b_props, "aspect_ratio" ) == 0.0 )
 516                 mlt_properties_set_double( b_props, "aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 517         mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 518
 519         // Honour the reverse here
 520         if ( mix >= 1.0 )
 521                 mix -= floor( mix );
 522
 523         mix = reverse || invert ? 1 - mix : mix;
 524         frame_delta *= reverse || invert ? -1.0 : 1.0;
 525
 526         // Ensure we get scaling on the b_frame
 527         if ( mlt_properties_get( b_props, "rescale.interp" ) == NULL || !strcmp( mlt_properties_get( b_props, "rescale.interp" ), "none" ) )
 528                 mlt_properties_set( b_props, "rescale.interp", "nearest" );
 529
 530         if ( mlt_properties_get( properties, "fixed" ) )
 531                 mix = mlt_properties_get_double( properties, "fixed" );
 532
 533         if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
 534                 // Composite the frames using a luma map
 535                 luma_composite( !invert ? a_frame : b_frame, !invert ? b_frame : a_frame, luma_width, luma_height, luma_bitmap, mix, frame_delta,
 536                         luma_softness, progressive ? -1 : top_field_first, width, height );
 537         else
 538                 // Dissolve the frames using the time offset for mix value
 539                 dissolve_yuv( a_frame, b_frame, mix, *width, *height );
 540
 541         // Extract the a_frame image info
 542         *width = mlt_properties_get_int( !invert ? a_props : b_props, "width" );
 543         *height = mlt_properties_get_int( !invert ? a_props : b_props, "height" );
 544         *image = mlt_properties_get_data( !invert ? a_props : b_props, "image", NULL );
 545
 546         return 0;
 547 }
 548
 549
 550 /** Luma transition processing.
 551 */
 552
 553 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 554 {
 555         // Get a unique name to store the frame position
 556         char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( transition ), "_unique_id" );
 557
 558         // Assign the current position to the name
 559         mlt_properties_set_position( MLT_FRAME_PROPERTIES( a_frame ), name, mlt_frame_get_position( a_frame ) );
 560
 561         // Push the transition on to the frame
 562         mlt_frame_push_service( a_frame, transition );
 563
 564         // Push the b_frame on to the stack
 565         mlt_frame_push_frame( a_frame, b_frame );
 566
 567         // Push the transition method
 568         mlt_frame_push_get_image( a_frame, transition_get_image );
 569
 570         return a_frame;
 571 }
 572
 573 /** Constructor for the filter.
 574 */
 575
 576 mlt_transition transition_luma_init( mlt_profile profile, mlt_service_type type, const char *id, char *lumafile )
 577 {
 578         mlt_transition transition = mlt_transition_new( );
 579         if ( transition != NULL )
 580         {
 581                 // Set the methods
 582                 transition->process = transition_process;
 583
 584                 // Default factory
 585                 mlt_properties_set( MLT_TRANSITION_PROPERTIES( transition ), "factory", "fezzik" );
 586
 587                 // Set the main property
 588                 mlt_properties_set( MLT_TRANSITION_PROPERTIES( transition ), "resource", lumafile );
 589
 590                 // Inform apps and framework that this is a video only transition
 591                 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "_transition_type", 1 );
 592
 593                 return transition;
 594         }
 595         return NULL;
 596 }