git.sesse.net Git - mlt/blob - src/modules/core/transition_composite.c

   1 /*
   2  * transition_composite.c -- compose one image over another using alpha channel
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   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_composite.h"
  22 #include <framework/mlt.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <ctype.h>
  27 #include <string.h>
  28 #include <math.h>
  29
  30 typedef void ( *composite_line_fn )( uint8_t *dest, uint8_t *src, int width_src, uint8_t *alpha_b, uint8_t *alpha_a, int weight, uint16_t *luma, int softness, uint32_t step );
  31
  32 /** Geometry struct.
  33 */
  34
  35 struct geometry_s
  36 {
  37         struct mlt_geometry_item_s item;
  38         int nw; // normalised width
  39         int nh; // normalised height
  40         int sw; // scaled width, not including consumer scale based upon w/nw
  41         int sh; // scaled height, not including consumer scale based upon h/nh
  42         int halign; // horizontal alignment: 0=left, 1=center, 2=right
  43         int valign; // vertical alignment: 0=top, 1=middle, 2=bottom
  44         int x_src;
  45         int y_src;
  46 };
  47
  48 /** Parse the alignment properties into the geometry.
  49 */
  50
  51 static int alignment_parse( char* align )
  52 {
  53         int ret = 0;
  54
  55         if ( align == NULL );
  56         else if ( isdigit( align[ 0 ] ) )
  57                 ret = atoi( align );
  58         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
  59                 ret = 1;
  60         else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
  61                 ret = 2;
  62
  63         return ret;
  64 }
  65
  66 /** Calculate real geometry.
  67 */
  68
  69 static void geometry_calculate( mlt_transition self, struct geometry_s *output, double position )
  70 {
  71         mlt_properties properties = MLT_TRANSITION_PROPERTIES( self );
  72         mlt_geometry geometry = mlt_properties_get_data( properties, "geometries", NULL );
  73         int mirror_off = mlt_properties_get_int( properties, "mirror_off" );
  74         int repeat_off = mlt_properties_get_int( properties, "repeat_off" );
  75         int length = mlt_geometry_get_length( geometry );
  76
  77         // Allow wrapping
  78         if ( !repeat_off && position >= length && length != 0 )
  79         {
  80                 int section = position / length;
  81                 position -= section * length;
  82                 if ( !mirror_off && section % 2 == 1 )
  83                         position = length - position;
  84         }
  85
  86         // Fetch the key for the position
  87         mlt_geometry_fetch( geometry, &output->item, position );
  88 }
  89
  90 static mlt_geometry transition_parse_keys( mlt_transition self, int normalised_width, int normalised_height )
  91 {
  92         // Loop variable for property interrogation
  93         int i = 0;
  94
  95         // Get the properties of the transition
  96         mlt_properties properties = MLT_TRANSITION_PROPERTIES( self );
  97
  98         // Create an empty geometries object
  99         mlt_geometry geometry = mlt_geometry_init( );
 100
 101         // Get the duration
 102         mlt_position length = mlt_transition_get_length( self );
 103         double cycle = mlt_properties_get_double( properties, "cycle" );
 104
 105         // Get the new style geometry string
 106         char *property = mlt_properties_get( properties, "geometry" );
 107
 108         // Allow a geometry repeat cycle
 109         if ( cycle >= 1 )
 110                 length = cycle;
 111         else if ( cycle > 0 )
 112                 length *= cycle;
 113
 114         // Parse the geometry if we have one
 115         mlt_geometry_parse( geometry, property, length, normalised_width, normalised_height );
 116
 117         // Check if we're using the old style geometry
 118         if ( property == NULL )
 119         {
 120                 // DEPRECATED: Multiple keys for geometry information is inefficient and too rigid for
 121                 // practical use - while deprecated, it has been slightly extended too - keys can now
 122                 // be specified out of order, and can be blanked or NULL to simulate removal
 123
 124                 // Structure to use for parsing and inserting
 125                 struct mlt_geometry_item_s item;
 126
 127                 // Parse the start property
 128                 item.frame = 0;
 129                 if ( mlt_geometry_parse_item( geometry, &item, mlt_properties_get( properties, "start" ) ) == 0 )
 130                         mlt_geometry_insert( geometry, &item );
 131
 132                 // Parse the keys in between
 133                 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
 134                 {
 135                         // Get the name of the property
 136                         char *name = mlt_properties_get_name( properties, i );
 137
 138                         // Check that it's valid
 139                         if ( !strncmp( name, "key[", 4 ) )
 140                         {
 141                                 // Get the value of the property
 142                                 char *value = mlt_properties_get_value( properties, i );
 143
 144                                 // Determine the frame number
 145                                 item.frame = atoi( name + 4 );
 146
 147                                 // Parse and add to the list
 148                                 if ( mlt_geometry_parse_item( geometry, &item, value ) == 0 )
 149                                         mlt_geometry_insert( geometry, &item );
 150                                 else
 151                                         fprintf( stderr, "Invalid Key - skipping %s = %s\n", name, value );
 152                         }
 153                 }
 154
 155                 // Parse the end
 156                 item.frame = -1;
 157                 if ( mlt_geometry_parse_item( geometry, &item, mlt_properties_get( properties, "end" ) ) == 0 )
 158                         mlt_geometry_insert( geometry, &item );
 159                 mlt_geometry_interpolate( geometry );
 160         }
 161
 162         return geometry;
 163 }
 164
 165 /** Adjust position according to scaled size and alignment properties.
 166 */
 167
 168 static void alignment_calculate( struct geometry_s *geometry )
 169 {
 170         geometry->item.x += ( geometry->item.w - geometry->sw ) * geometry->halign / 2;
 171         geometry->item.y += ( geometry->item.h - geometry->sh ) * geometry->valign / 2;
 172 }
 173
 174 /** Calculate the position for this frame.
 175 */
 176
 177 static int position_calculate( mlt_transition self, mlt_position position )
 178 {
 179         // Get the in and out position
 180         mlt_position in = mlt_transition_get_in( self );
 181
 182         // Now do the calcs
 183         return position - in;
 184 }
 185
 186 /** Calculate the field delta for this frame - position between two frames.
 187 */
 188
 189 static int get_value( mlt_properties properties, const char *preferred, const char *fallback )
 190 {
 191         int value = mlt_properties_get_int( properties, preferred );
 192         if ( value == 0 )
 193                 value = mlt_properties_get_int( properties, fallback );
 194         return value;
 195 }
 196
 197 /** A linear threshold determination function.
 198 */
 199
 200 static inline int32_t linearstep( int32_t edge1, int32_t edge2, int32_t a )
 201 {
 202         if ( a < edge1 )
 203                 return 0;
 204
 205         if ( a >= edge2 )
 206                 return 0x10000;
 207
 208         return ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
 209 }
 210
 211 /** A smoother, non-linear threshold determination function.
 212 */
 213
 214 static inline int32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
 215 {
 216         if ( a < edge1 )
 217                 return 0;
 218
 219         if ( a >= edge2 )
 220                 return 0x10000;
 221
 222         a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
 223
 224         return ( ( ( a * a ) >> 16 )  * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
 225 }
 226
 227 /** Load the luma map from PGM stream.
 228 */
 229
 230 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
 231 {
 232         uint8_t *data = NULL;
 233         while (1)
 234         {
 235                 char line[128];
 236                 char comment[128];
 237                 int i = 2;
 238                 int maxval;
 239                 int bpp;
 240                 uint16_t *p;
 241
 242                 line[127] = '\0';
 243
 244                 // get the magic code
 245                 if ( fgets( line, 127, f ) == NULL )
 246                         break;
 247
 248                 // skip comments
 249                 while ( sscanf( line, " #%s", comment ) > 0 )
 250                         if ( fgets( line, 127, f ) == NULL )
 251                                 break;
 252
 253                 if ( line[0] != 'P' || line[1] != '5' )
 254                         break;
 255
 256                 // skip white space and see if a new line must be fetched
 257                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 258                 if ( ( line[i] == '\0' || line[i] == '#' ) && fgets( line, 127, f ) == NULL )
 259                         break;
 260
 261                 // skip comments
 262                 while ( sscanf( line, " #%s", comment ) > 0 )
 263                         if ( fgets( line, 127, f ) == NULL )
 264                                 break;
 265
 266                 // get the dimensions
 267                 if ( line[0] == 'P' )
 268                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 269                 else
 270                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 271
 272                 // get the height value, if not yet
 273                 if ( i < 2 )
 274                 {
 275                         if ( fgets( line, 127, f ) == NULL )
 276                                 break;
 277
 278                         // skip comments
 279                         while ( sscanf( line, " #%s", comment ) > 0 )
 280                                 if ( fgets( line, 127, f ) == NULL )
 281                                         break;
 282
 283                         i = sscanf( line, "%d", height );
 284                         if ( i == 0 )
 285                                 break;
 286                         else
 287                                 i = 2;
 288                 }
 289
 290                 // get the maximum gray value, if not yet
 291                 if ( i < 3 )
 292                 {
 293                         if ( fgets( line, 127, f ) == NULL )
 294                                 break;
 295
 296                         // skip comments
 297                         while ( sscanf( line, " #%s", comment ) > 0 )
 298                                 if ( fgets( line, 127, f ) == NULL )
 299                                         break;
 300
 301                         i = sscanf( line, "%d", &maxval );
 302                         if ( i == 0 )
 303                                 break;
 304                 }
 305
 306                 // determine if this is one or two bytes per pixel
 307                 bpp = maxval > 255 ? 2 : 1;
 308
 309                 // allocate temporary storage for the raw data
 310                 data = mlt_pool_alloc( *width * *height * bpp );
 311                 if ( data == NULL )
 312                         break;
 313
 314                 // read the raw data
 315                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 316                         break;
 317
 318                 // allocate the luma bitmap
 319                 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
 320                 if ( *map == NULL )
 321                         break;
 322
 323                 // proces the raw data into the luma bitmap
 324                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 325                 {
 326                         if ( bpp == 1 )
 327                                 *p++ = data[ i ] << 8;
 328                         else
 329                                 *p++ = ( data[ i ] << 8 ) + data[ i + 1 ];
 330                 }
 331
 332                 break;
 333         }
 334
 335         if ( data != NULL )
 336                 mlt_pool_release( data );
 337 }
 338
 339 /** Generate a luma map from any YUV image.
 340 */
 341
 342 static void luma_read_yuv422( uint8_t *image, uint16_t **map, int width, int height )
 343 {
 344         int i;
 345
 346         // allocate the luma bitmap
 347         uint16_t *p = *map = ( uint16_t* )mlt_pool_alloc( width * height * sizeof( uint16_t ) );
 348         if ( *map == NULL )
 349                 return;
 350
 351         // proces the image data into the luma bitmap
 352         for ( i = 0; i < width * height * 2; i += 2 )
 353                 *p++ = ( image[ i ] - 16 ) * 299; // 299 = 65535 / 219
 354 }
 355
 356 static inline int calculate_mix( uint16_t *luma, int j, int softness, int weight, int alpha, uint32_t step )
 357 {
 358         return ( ( luma ? smoothstep( luma[ j ], luma[ j ] + softness, step ) : weight ) * ( alpha + 1 ) ) >> 8;
 359 }
 360
 361 static inline uint8_t sample_mix( uint8_t dest, uint8_t src, int mix )
 362 {
 363         return ( src * mix + dest * ( ( 1 << 16 ) - mix ) ) >> 16;
 364 }
 365
 366 /** Composite a source line over a destination line
 367 */
 368 #if defined(USE_SSE) && defined(ARCH_X86_64)
 369 void composite_line_yuv_sse2_simple(uint8_t *dest, uint8_t *src, int width, uint8_t *alpha_b, uint8_t *alpha_a, int weight);
 370 #endif
 371
 372 void composite_line_yuv( uint8_t *dest, uint8_t *src, int width, uint8_t *alpha_b, uint8_t *alpha_a, int weight, uint16_t *luma, int soft, uint32_t step )
 373 {
 374         register int j = 0;
 375         register int mix;
 376
 377 #if defined(USE_SSE) && defined(ARCH_X86_64)
 378         if ( !luma && width > 7 )
 379         {
 380                 composite_line_yuv_sse2_simple(dest, src, width, alpha_b, alpha_a, weight);
 381                 j = width - width % 8;
 382                 dest += j * 2;
 383                 src += j * 2;
 384                 alpha_a += j;
 385                 alpha_b += j;
 386         }
 387 #endif
 388
 389         for ( ; j < width; j ++ )
 390         {
 391                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++, step );
 392                 *dest = sample_mix( *dest, *src++, mix );
 393                 dest++;
 394                 *dest = sample_mix( *dest, *src++, mix );
 395                 dest++;
 396                 *alpha_a = ( mix >> 8 ) | *alpha_a;
 397                 alpha_a ++;
 398         }
 399 }
 400
 401 static void composite_line_yuv_or( uint8_t *dest, uint8_t *src, int width, uint8_t *alpha_b, uint8_t *alpha_a, int weight, uint16_t *luma, int soft, uint32_t step )
 402 {
 403         register int j;
 404         register int mix;
 405
 406         for ( j = 0; j < width; j ++ )
 407         {
 408                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++ | *alpha_a, step );
 409                 *dest = sample_mix( *dest, *src++, mix );
 410                 dest++;
 411                 *dest = sample_mix( *dest, *src++, mix );
 412                 dest++;
 413                 *alpha_a ++ = mix >> 8;
 414         }
 415 }
 416
 417 static void composite_line_yuv_and( uint8_t *dest, uint8_t *src, int width, uint8_t *alpha_b, uint8_t *alpha_a, int weight, uint16_t *luma, int soft, uint32_t step  )
 418 {
 419         register int j;
 420         register int mix;
 421
 422         for ( j = 0; j < width; j ++ )
 423         {
 424                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++ & *alpha_a, step );
 425                 *dest = sample_mix( *dest, *src++, mix );
 426                 dest++;
 427                 *dest = sample_mix( *dest, *src++, mix );
 428                 dest++;
 429                 *alpha_a ++ = mix >> 8;
 430         }
 431 }
 432
 433 static void composite_line_yuv_xor( uint8_t *dest, uint8_t *src, int width, uint8_t *alpha_b, uint8_t *alpha_a, int weight, uint16_t *luma, int soft, uint32_t step )
 434 {
 435         register int j;
 436         register int mix;
 437
 438         for ( j = 0; j < width; j ++ )
 439         {
 440                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++ ^ *alpha_a, step );
 441                 *dest = sample_mix( *dest, *src++, mix );
 442                 dest++;
 443                 *dest = sample_mix( *dest, *src++, mix );
 444                 dest++;
 445                 *alpha_a ++ = mix >> 8;
 446         }
 447 }
 448
 449 /** Composite function.
 450 */
 451
 452 static int composite_yuv( uint8_t *p_dest, int width_dest, int height_dest, uint8_t *p_src, int width_src, int height_src, uint8_t *alpha_b, uint8_t *alpha_a, struct geometry_s geometry, int field, uint16_t *p_luma, double softness, composite_line_fn line_fn )
 453 {
 454         int ret = 0;
 455         int i;
 456         int x_src = -geometry.x_src, y_src = -geometry.y_src;
 457         int uneven_x_src = ( x_src % 2 );
 458         int step = ( field > -1 ) ? 2 : 1;
 459         int bpp = 2;
 460         int stride_src = geometry.sw * bpp;
 461         int stride_dest = width_dest * bpp;
 462         int i_softness = ( 1 << 16 ) * softness;
 463         int weight = ( ( 1 << 16 ) * geometry.item.mix + 50 ) / 100;
 464         uint32_t luma_step = ( ( ( 1 << 16 ) - 1 ) * geometry.item.mix + 50 ) / 100 * ( 1.0 + softness );
 465
 466         // Adjust to consumer scale
 467         int x = rint( geometry.item.x * width_dest / geometry.nw );
 468         int y = rint( geometry.item.y * height_dest / geometry.nh );
 469         int uneven_x = ( x % 2 );
 470
 471         // optimization points - no work to do
 472         if ( width_src <= 0 || height_src <= 0 || y_src >= height_src || x_src >= width_src )
 473                 return ret;
 474
 475         if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
 476                 return ret;
 477
 478         // cropping affects the source width
 479         if ( x_src > 0 )
 480         {
 481                 width_src -= x_src;
 482                 // and it implies cropping
 483                 if ( width_src > geometry.item.w )
 484                         width_src = geometry.item.w;
 485         }
 486
 487         // cropping affects the source height
 488         if ( y_src > 0 )
 489         {
 490                 height_src -= y_src;
 491                 // and it implies cropping
 492                 if ( height_src > geometry.item.h )
 493                         height_src = geometry.item.h;
 494         }
 495
 496         // crop overlay off the left edge of frame
 497         if ( x < 0 )
 498         {
 499                 x_src = -x;
 500                 width_src -= x_src;
 501                 x = 0;
 502         }
 503
 504         // crop overlay beyond right edge of frame
 505         if ( x + width_src > width_dest )
 506                 width_src = width_dest - x;
 507
 508         // crop overlay off the top edge of the frame
 509         if ( y < 0 )
 510         {
 511                 y_src = -y;
 512                 height_src -= y_src;
 513                 y = 0;
 514         }
 515
 516         // crop overlay below bottom edge of frame
 517         if ( y + height_src > height_dest )
 518                 height_src = height_dest - y;
 519
 520         // offset pointer into overlay buffer based on cropping
 521         p_src += x_src * bpp + y_src * stride_src;
 522
 523         // offset pointer into frame buffer based upon positive coordinates only!
 524         p_dest += x * bpp + y * stride_dest;
 525
 526         // offset pointer into alpha channel based upon cropping
 527         alpha_b += x_src + y_src * stride_src / bpp;
 528         alpha_a += x + y * stride_dest / bpp;
 529
 530         // offset pointer into luma channel based upon cropping
 531         if ( p_luma )
 532                 p_luma += x_src + y_src * stride_src / bpp;
 533
 534         // Assuming lower field first
 535         // Special care is taken to make sure the b_frame is aligned to the correct field.
 536         // field 0 = lower field and y should be odd (y is 0-based).
 537         // field 1 = upper field and y should be even.
 538         if ( ( field > -1 ) && ( y % 2 == field ) )
 539         {
 540                 if ( ( field == 1 && y < height_dest - 1 ) || ( field == 0 && y == 0 ) )
 541                         p_dest += stride_dest;
 542                 else
 543                         p_dest -= stride_dest;
 544         }
 545
 546         // On the second field, use the other lines from b_frame
 547         if ( field == 1 )
 548         {
 549                 p_src += stride_src;
 550                 alpha_b += stride_src / bpp;
 551                 alpha_a += stride_dest / bpp;
 552                 height_src--;
 553         }
 554
 555         stride_src *= step;
 556         stride_dest *= step;
 557         int alpha_b_stride = stride_src / bpp;
 558         int alpha_a_stride = stride_dest / bpp;
 559
 560         // Align chroma of source and destination
 561         if ( uneven_x != uneven_x_src )
 562         {
 563                 p_src += 2;
 564                 alpha_b += 1;
 565         }
 566
 567         // now do the compositing only to cropped extents
 568         for ( i = 0; i < height_src; i += step )
 569         {
 570                 line_fn( p_dest, p_src, width_src, alpha_b, alpha_a, weight, p_luma, i_softness, luma_step );
 571
 572                 p_src += stride_src;
 573                 p_dest += stride_dest;
 574                 alpha_b += alpha_b_stride;
 575                 alpha_a += alpha_a_stride;
 576                 if ( p_luma )
 577                         p_luma += alpha_b_stride;
 578         }
 579
 580         return ret;
 581 }
 582
 583
 584 /** Scale 16bit greyscale luma map using nearest neighbor.
 585 */
 586
 587 static inline void
 588 scale_luma ( uint16_t *dest_buf, int dest_width, int dest_height, const uint16_t *src_buf, int src_width, int src_height, int invert )
 589 {
 590         register int i, j;
 591         register int x_step = ( src_width << 16 ) / dest_width;
 592         register int y_step = ( src_height << 16 ) / dest_height;
 593         register int x, y = 0;
 594
 595         for ( i = 0; i < dest_height; i++ )
 596         {
 597                 const uint16_t *src = src_buf + ( y >> 16 ) * src_width;
 598                 x = 0;
 599
 600                 for ( j = 0; j < dest_width; j++ )
 601                 {
 602                         *dest_buf++ = src[ x >> 16 ] ^ invert;
 603                         x += x_step;
 604                 }
 605                 y += y_step;
 606         }
 607 }
 608
 609 static uint16_t* get_luma( mlt_transition self, mlt_properties properties, int width, int height )
 610 {
 611         // The cached luma map information
 612         int luma_width = mlt_properties_get_int( properties, "_luma.width" );
 613         int luma_height = mlt_properties_get_int( properties, "_luma.height" );
 614         uint16_t *luma_bitmap = mlt_properties_get_data( properties, "_luma.bitmap", NULL );
 615         int invert = mlt_properties_get_int( properties, "luma_invert" );
 616
 617         // If the filename property changed, reload the map
 618         char *resource = mlt_properties_get( properties, "luma" );
 619
 620         char temp[ 512 ];
 621
 622         if ( luma_width == 0 || luma_height == 0 )
 623         {
 624                 luma_width = width;
 625                 luma_height = height;
 626         }
 627
 628         if ( resource && resource[0] && strchr( resource, '%' ) )
 629         {
 630                 // TODO: Clean up quick and dirty compressed/existence check
 631                 FILE *test;
 632                 sprintf( temp, "%s/lumas/%s/%s", mlt_environment( "MLT_DATA" ), mlt_environment( "MLT_NORMALISATION" ), strchr( resource, '%' ) + 1 );
 633                 test = fopen( temp, "r" );
 634                 if ( test == NULL )
 635                         strcat( temp, ".png" );
 636                 else
 637                         fclose( test );
 638                 resource = temp;
 639         }
 640
 641         if ( resource && resource[0] )
 642         {
 643                 char *old_luma = mlt_properties_get( properties, "_luma" );
 644                 int old_invert = mlt_properties_get_int( properties, "_luma_invert" );
 645
 646                 if ( invert != old_invert || ( old_luma && old_luma[0] && strcmp( resource, old_luma ) ) )
 647                 {
 648                         mlt_properties_set_data( properties, "_luma.orig_bitmap", NULL, 0, NULL, NULL );
 649                         luma_bitmap = NULL;
 650                 }
 651         }
 652         else {
 653                 char *old_luma = mlt_properties_get( properties, "_luma" );
 654                 if ( old_luma && old_luma[0] )
 655                 {
 656                         mlt_properties_set_data( properties, "_luma.orig_bitmap", NULL, 0, NULL, NULL );
 657                         luma_bitmap = NULL;
 658                         mlt_properties_set( properties, "_luma", NULL);
 659                 }
 660         }
 661
 662         if ( resource && resource[0] && ( luma_bitmap == NULL || luma_width != width || luma_height != height ) )
 663         {
 664                 uint16_t *orig_bitmap = mlt_properties_get_data( properties, "_luma.orig_bitmap", NULL );
 665                 luma_width = mlt_properties_get_int( properties, "_luma.orig_width" );
 666                 luma_height = mlt_properties_get_int( properties, "_luma.orig_height" );
 667
 668                 // Load the original luma once
 669                 if ( orig_bitmap == NULL )
 670                 {
 671                         char *extension = strrchr( resource, '.' );
 672
 673                         // See if it is a PGM
 674                         if ( extension != NULL && strcmp( extension, ".pgm" ) == 0 )
 675                         {
 676                                 // Open PGM
 677                                 FILE *f = fopen( resource, "r" );
 678                                 if ( f != NULL )
 679                                 {
 680                                         // Load from PGM
 681                                         luma_read_pgm( f, &orig_bitmap, &luma_width, &luma_height );
 682                                         fclose( f );
 683
 684                                         // Remember the original size for subsequent scaling
 685                                         mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
 686                                         mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
 687                                         mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
 688                                 }
 689                         }
 690                         else
 691                         {
 692                                 // Get the factory producer service
 693                                 char *factory = mlt_properties_get( properties, "factory" );
 694
 695                                 // Create the producer
 696                                 mlt_profile profile = mlt_service_profile( MLT_TRANSITION_SERVICE( self ) );
 697                                 mlt_producer producer = mlt_factory_producer( profile, factory, resource );
 698
 699                                 // If we have one
 700                                 if ( producer != NULL )
 701                                 {
 702                                         // Get the producer properties
 703                                         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 704
 705                                         // Ensure that we loop
 706                                         mlt_properties_set( producer_properties, "eof", "loop" );
 707
 708                                         // Now pass all producer. properties on the transition down
 709                                         mlt_properties_pass( producer_properties, properties, "luma." );
 710
 711                                         // We will get the alpha frame from the producer
 712                                         mlt_frame luma_frame = NULL;
 713
 714                                         // Get the luma frame
 715                                         if ( mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &luma_frame, 0 ) == 0 )
 716                                         {
 717                                                 uint8_t *luma_image;
 718                                                 mlt_image_format luma_format = mlt_image_yuv422;
 719
 720                                                 // Get image from the luma producer
 721                                                 mlt_properties_set( MLT_FRAME_PROPERTIES( luma_frame ), "rescale.interp", "none" );
 722                                                 mlt_frame_get_image( luma_frame, &luma_image, &luma_format, &luma_width, &luma_height, 0 );
 723
 724                                                 // Generate the luma map
 725                                                 if ( luma_image != NULL && luma_format == mlt_image_yuv422 )
 726                                                         luma_read_yuv422( luma_image, &orig_bitmap, luma_width, luma_height );
 727
 728                                                 // Remember the original size for subsequent scaling
 729                                                 mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
 730                                                 mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
 731                                                 mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
 732
 733                                                 // Cleanup the luma frame
 734                                                 mlt_frame_close( luma_frame );
 735                                         }
 736
 737                                         // Cleanup the luma producer
 738                                         mlt_producer_close( producer );
 739                                 }
 740                         }
 741                 }
 742                 // Scale luma map
 743                 luma_bitmap = mlt_pool_alloc( width * height * sizeof( uint16_t ) );
 744                 scale_luma( luma_bitmap, width, height, orig_bitmap, luma_width, luma_height, invert * ( ( 1 << 16 ) - 1 ) );
 745
 746                 // Remember the scaled luma size to prevent unnecessary scaling
 747                 mlt_properties_set_int( properties, "_luma.width", width );
 748                 mlt_properties_set_int( properties, "_luma.height", height );
 749                 mlt_properties_set_data( properties, "_luma.bitmap", luma_bitmap, width * height * 2, mlt_pool_release, NULL );
 750                 mlt_properties_set( properties, "_luma", resource );
 751                 mlt_properties_set_int( properties, "_luma_invert", invert );
 752         }
 753         return luma_bitmap;
 754 }
 755
 756 /** Get the properly sized image from b_frame.
 757 */
 758
 759 static int get_b_frame_image( mlt_transition self, mlt_frame b_frame, uint8_t **image, int *width, int *height, struct geometry_s *geometry )
 760 {
 761         int ret = 0;
 762         mlt_image_format format = mlt_image_yuv422;
 763
 764         // Get the properties objects
 765         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 766         mlt_properties properties = MLT_TRANSITION_PROPERTIES( self );
 767         uint8_t resize_alpha = mlt_properties_get_int( b_props, "resize_alpha" );
 768         double output_ar = mlt_profile_sar( mlt_service_profile( MLT_TRANSITION_SERVICE(self) ) );
 769
 770         // Do not scale if we are cropping - the compositing rectangle can crop the b image
 771         // TODO: Use the animatable w and h of the crop geometry to scale independently of crop rectangle
 772         if ( mlt_properties_get( properties, "crop" ) )
 773         {
 774                 int real_width = get_value( b_props, "meta.media.width", "width" );
 775                 int real_height = get_value( b_props, "meta.media.height", "height" );
 776                 double input_ar = mlt_properties_get_double( b_props, "aspect_ratio" );
 777                 int scaled_width = rint( ( input_ar == 0.0 ? output_ar : input_ar ) / output_ar * real_width );
 778                 int scaled_height = real_height;
 779                 geometry->sw = scaled_width;
 780                 geometry->sh = scaled_height;
 781         }
 782         // Normalise aspect ratios and scale preserving aspect ratio
 783         else if ( mlt_properties_get_int( properties, "aligned" ) && mlt_properties_get_int( properties, "distort" ) == 0 && mlt_properties_get_int( b_props, "distort" ) == 0 && geometry->item.distort == 0 )
 784         {
 785                 // Adjust b_frame pixel aspect
 786                 int normalised_width = geometry->item.w;
 787                 int normalised_height = geometry->item.h;
 788                 int real_width = get_value( b_props, "meta.media.width", "width" );
 789                 int real_height = get_value( b_props, "meta.media.height", "height" );
 790                 double input_ar = mlt_properties_get_double( b_props, "aspect_ratio" );
 791                 int scaled_width = rint( ( input_ar == 0.0 ? output_ar : input_ar ) / output_ar * real_width );
 792                 int scaled_height = real_height;
 793 // fprintf(stderr, "%s: scaled %dx%d norm %dx%d real %dx%d output_ar %f\n", __FILE__,
 794 // scaled_width, scaled_height, normalised_width, normalised_height, real_width, real_height,
 795 // output_ar);
 796
 797                 // Now ensure that our images fit in the normalised frame
 798                 if ( scaled_width > normalised_width )
 799                 {
 800                         scaled_height = rint( scaled_height * normalised_width / scaled_width );
 801                         scaled_width = normalised_width;
 802                 }
 803                 if ( scaled_height > normalised_height )
 804                 {
 805                         scaled_width = rint( scaled_width * normalised_height / scaled_height );
 806                         scaled_height = normalised_height;
 807                 }
 808
 809                 // Honour the fill request - this will scale the image to fill width or height while maintaining a/r
 810                 // ????: Shouln't this be the default behaviour?
 811                 if ( mlt_properties_get_int( properties, "fill" ) && scaled_width > 0 && scaled_height > 0 )
 812                 {
 813                         if ( scaled_height < normalised_height && scaled_width * normalised_height / scaled_height <= normalised_width )
 814                         {
 815                                 scaled_width = rint( scaled_width * normalised_height / scaled_height );
 816                                 scaled_height = normalised_height;
 817                         }
 818                         else if ( scaled_width < normalised_width && scaled_height * normalised_width / scaled_width < normalised_height )
 819                         {
 820                                 scaled_height = rint( scaled_height * normalised_width / scaled_width );
 821                                 scaled_width = normalised_width;
 822                         }
 823                 }
 824
 825                 // Save the new scaled dimensions
 826                 geometry->sw = scaled_width;
 827                 geometry->sh = scaled_height;
 828         }
 829         else
 830         {
 831                 geometry->sw = geometry->item.w;
 832                 geometry->sh = geometry->item.h;
 833         }
 834
 835         // We want to ensure that we bypass resize now...
 836         if ( resize_alpha == 0 )
 837                 mlt_properties_set_int( b_props, "distort", mlt_properties_get_int( properties, "distort" ) );
 838
 839         // If we're not aligned, we want a non-transparent background
 840         if ( mlt_properties_get_int( properties, "aligned" ) == 0 )
 841                 mlt_properties_set_int( b_props, "resize_alpha", 255 );
 842
 843         // Take into consideration alignment for optimisation (titles are a special case)
 844         if ( !mlt_properties_get_int( properties, "titles" ) &&
 845                  mlt_properties_get( properties, "crop" ) == NULL )
 846                 alignment_calculate( geometry );
 847
 848         // Adjust to consumer scale
 849         *width = rint( geometry->sw * *width / geometry->nw );
 850         *width -= *width % 2; // coerce to even width for yuv422
 851         *height = rint( geometry->sh * *height / geometry->nh );
 852 // fprintf(stderr, "%s: scaled %dx%d norm %dx%d resize %dx%d\n", __FILE__,
 853 // geometry->sw, geometry->sh, geometry->nw, geometry->nh, *width, *height);
 854
 855         ret = mlt_frame_get_image( b_frame, image, &format, width, height, 1 );
 856
 857         // composite_yuv uses geometry->sw to determine source stride, which
 858         // should equal the image width if not using crop property.
 859         if ( !mlt_properties_get( properties, "crop" ) )
 860                 geometry->sw = *width;
 861
 862         // Set the frame back
 863         mlt_properties_set_int( b_props, "resize_alpha", resize_alpha );
 864
 865         return ret && image != NULL;
 866 }
 867
 868 static void crop_calculate( mlt_transition self, mlt_properties properties, struct geometry_s *result, double position )
 869 {
 870         // Initialize panning info
 871         result->x_src = 0;
 872         result->y_src = 0;
 873         if ( mlt_properties_get( properties, "crop" ) )
 874         {
 875                 mlt_geometry crop = mlt_properties_get_data( properties, "crop_geometry", NULL );
 876                 if ( !crop )
 877                 {
 878                         crop = mlt_geometry_init();
 879                         mlt_position length = mlt_transition_get_length( self );
 880                         double cycle = mlt_properties_get_double( properties, "cycle" );
 881
 882                         // Allow a geometry repeat cycle
 883                         if ( cycle >= 1 )
 884                                 length = cycle;
 885                         else if ( cycle > 0 )
 886                                 length *= cycle;
 887                         mlt_geometry_parse( crop, mlt_properties_get( properties, "crop" ), length, result->sw, result->sh );
 888                         mlt_properties_set_data( properties, "crop_geometry", crop, 0, (mlt_destructor)mlt_geometry_close, NULL );
 889                 }
 890
 891                 // Repeat processing
 892                 int length = mlt_geometry_get_length( crop );
 893                 int mirror_off = mlt_properties_get_int( properties, "mirror_off" );
 894                 int repeat_off = mlt_properties_get_int( properties, "repeat_off" );
 895                 if ( !repeat_off && position >= length && length != 0 )
 896                 {
 897                         int section = position / length;
 898                         position -= section * length;
 899                         if ( !mirror_off && section % 2 == 1 )
 900                                 position = length - position;
 901                 }
 902
 903                 // Compute the pan
 904                 struct mlt_geometry_item_s crop_item;
 905                 mlt_geometry_fetch( crop, &crop_item, position );
 906                 result->x_src = rint( crop_item.x );
 907                 result->y_src = rint( crop_item.y );
 908         }
 909 }
 910
 911 static mlt_geometry composite_calculate( mlt_transition self, struct geometry_s *result, mlt_frame a_frame, double position )
 912 {
 913         // Get the properties from the transition
 914         mlt_properties properties = MLT_TRANSITION_PROPERTIES( self );
 915
 916         // Get the properties from the frame
 917         mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
 918
 919         // Structures for geometry
 920         mlt_geometry start = mlt_properties_get_data( properties, "geometries", NULL );
 921
 922         // Obtain the normalised width and height from the a_frame
 923         mlt_profile profile = mlt_service_profile( MLT_TRANSITION_SERVICE( self ) );
 924         int normalised_width = profile->width;
 925         int normalised_height = profile->height;
 926
 927         char *name = mlt_properties_get( properties, "_unique_id" );
 928         char key[ 256 ];
 929
 930         sprintf( key, "%s.in", name );
 931         if ( mlt_properties_get( a_props, key ) )
 932         {
 933                 sscanf( mlt_properties_get( a_props, key ), "%f %f %f %f %f %d %d", &result->item.x, &result->item.y, &result->item.w, &result->item.h, &result->item.mix, &result->nw, &result->nh );
 934         }
 935         else
 936         {
 937                 // Now parse the geometries
 938                 if ( start == NULL )
 939                 {
 940                         // Parse the transitions properties
 941                         start = transition_parse_keys( self, normalised_width, normalised_height );
 942
 943                         // Assign to properties to ensure we get destroyed
 944                         mlt_properties_set_data( properties, "geometries", start, 0, ( mlt_destructor )mlt_geometry_close, NULL );
 945                 }
 946                 else
 947                 {
 948                         mlt_position length = mlt_transition_get_length( self );
 949                         double cycle = mlt_properties_get_double( properties, "cycle" );
 950                         if ( cycle > 1 )
 951                                 length = cycle;
 952                         else if ( cycle > 0 )
 953                                 length *= cycle;
 954                         mlt_geometry_refresh( start, mlt_properties_get( properties, "geometry" ), length, normalised_width, normalised_height );
 955                 }
 956
 957                 // Do the calculation
 958                 geometry_calculate( self, result, position );
 959
 960                 // Assign normalised info
 961                 result->nw = normalised_width;
 962                 result->nh = normalised_height;
 963         }
 964
 965         // Now parse the alignment
 966         result->halign = alignment_parse( mlt_properties_get( properties, "halign" ) );
 967         result->valign = alignment_parse( mlt_properties_get( properties, "valign" ) );
 968
 969         crop_calculate( self, properties, result, position );
 970
 971         return start;
 972 }
 973
 974 mlt_frame composite_copy_region( mlt_transition self, mlt_frame a_frame, mlt_position frame_position )
 975 {
 976         // Create a frame to return
 977         mlt_frame b_frame = mlt_frame_init( MLT_TRANSITION_SERVICE( self ) );
 978
 979         // Get the properties of the a frame
 980         mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
 981
 982         // Get the properties of the b frame
 983         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 984
 985         // Get the position
 986         int position = position_calculate( self, frame_position );
 987
 988         // Get the unique id of the transition
 989         char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( self ), "_unique_id" );
 990         char key[ 256 ];
 991
 992         // Destination image
 993         uint8_t *dest = NULL;
 994
 995         // Get the image and dimensions
 996         uint8_t *image = NULL;
 997         int width = mlt_properties_get_int( a_props, "width" );
 998         int height = mlt_properties_get_int( a_props, "height" );
 999         mlt_image_format format = mlt_image_yuv422;
1000
1001         mlt_frame_get_image( a_frame, &image, &format, &width, &height, 0 );
1002         if ( !image )
1003                 return b_frame;
1004
1005         // Pointers for copy operation
1006         uint8_t *p;
1007
1008         // Coordinates
1009         int w = 0;
1010         int h = 0;
1011         int x = 0;
1012         int y = 0;
1013
1014         int ss = 0;
1015         int ds = 0;
1016
1017         // Will need to know region to copy
1018         struct geometry_s result;
1019
1020         // Calculate the region now
1021         composite_calculate( self, &result, a_frame, position );
1022
1023         // Need to scale down to actual dimensions
1024         x = rint( result.item.x * width / result.nw );
1025         y = rint( result.item.y * height / result.nh );
1026         w = rint( result.item.w * width / result.nw );
1027         h = rint( result.item.h * height / result.nh );
1028
1029         if ( x % 2 )
1030         {
1031                 x --;
1032                 w ++;
1033         }
1034
1035         // Store the key
1036         sprintf( key, "%s.in=%d %d %d %d %f %d %d", name, x, y, w, h, result.item.mix, width, height );
1037         mlt_properties_parse( a_props, key );
1038         sprintf( key, "%s.out=%d %d %d %d %f %d %d", name, x, y, w, h, result.item.mix, width, height );
1039         mlt_properties_parse( a_props, key );
1040
1041         ds = w * 2;
1042         ss = width * 2;
1043
1044         // Now we need to create a new destination image
1045         dest = mlt_pool_alloc( w * h * 2 );
1046
1047         // Assign to the new frame
1048         mlt_frame_set_image( b_frame, dest, w * h * 2, mlt_pool_release );
1049         mlt_properties_set_int( b_props, "width", w );
1050         mlt_properties_set_int( b_props, "height", h );
1051         mlt_properties_set_int( b_props, "format", format );
1052
1053         if ( y < 0 )
1054         {
1055                 dest += ( ds * -y );
1056                 h += y;
1057                 y = 0;
1058         }
1059
1060         if ( y + h > height )
1061                 h -= ( y + h - height );
1062
1063         if ( x < 0 )
1064         {
1065                 dest += -x * 2;
1066                 w += x;
1067                 x = 0;
1068         }
1069
1070         if ( w > 0 && h > 0 )
1071         {
1072                 // Copy the region of the image
1073                 p = image + y * ss + x * 2;
1074
1075                 while ( h -- )
1076                 {
1077                         memcpy( dest, p, w * 2 );
1078                         dest += ds;
1079                         p += ss;
1080                 }
1081         }
1082
1083         // Assign this position to the b frame
1084         mlt_frame_set_position( b_frame, frame_position );
1085         mlt_properties_set_int( b_props, "distort", 1 );
1086
1087         // Return the frame
1088         return b_frame;
1089 }
1090
1091 /** Get the image.
1092 */
1093
1094 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
1095 {
1096         // Get the b frame from the stack
1097         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
1098
1099         // Get the transition from the a frame
1100         mlt_transition self = mlt_frame_pop_service( a_frame );
1101
1102         // Get in and out
1103         double position = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( a_frame ) );
1104         int out = mlt_frame_pop_service_int( a_frame );
1105         int in = mlt_frame_pop_service_int( a_frame );
1106
1107         // Get the properties from the transition
1108         mlt_properties properties = MLT_TRANSITION_PROPERTIES( self );
1109
1110         // TODO: clean up always_active behaviour
1111         if ( mlt_properties_get_int( properties, "always_active" ) )
1112         {
1113                 mlt_events_block( properties, properties );
1114                 mlt_properties_set_int( properties, "in", in );
1115                 mlt_properties_set_int( properties, "out", out );
1116                 mlt_events_unblock( properties, properties );
1117         }
1118
1119         // This compositer is yuv422 only
1120         *format = mlt_image_yuv422;
1121
1122         if ( b_frame != NULL )
1123         {
1124                 // Get the properties of the a frame
1125                 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
1126
1127                 // Get the properties of the b frame
1128                 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
1129
1130                 // Structures for geometry
1131                 struct geometry_s result;
1132
1133                 // Calculate the position
1134                 double delta = mlt_transition_get_progress_delta( self, a_frame );
1135                 mlt_position length = mlt_transition_get_length( self );
1136
1137                 // Get the image from the b frame
1138                 uint8_t *image_b = NULL;
1139                 mlt_profile profile = mlt_service_profile( MLT_TRANSITION_SERVICE( self ) );
1140                 int width_b = *width > 0 ? *width : profile->width;
1141                 int height_b = *height > 0 ? *height : profile->height;
1142
1143                 // Vars for alphas
1144                 uint8_t *alpha_a = NULL;
1145                 uint8_t *alpha_b = NULL;
1146
1147                 // Do the calculation
1148                 // NB: Locks needed here since the properties are being modified
1149                 int invert = mlt_properties_get_int( properties, "invert" );
1150                 mlt_service_lock( MLT_TRANSITION_SERVICE( self ) );
1151                 composite_calculate( self, &result, invert ? b_frame : a_frame, position );
1152                 mlt_service_unlock( MLT_TRANSITION_SERVICE( self ) );
1153
1154                 // Manual option to deinterlace
1155                 if ( mlt_properties_get_int( properties, "deinterlace" ) )
1156                 {
1157                         mlt_properties_set_int( a_props, "consumer_deinterlace", 1 );
1158                         mlt_properties_set_int( b_props, "consumer_deinterlace", 1 );
1159                 }
1160
1161                 // TODO: Dangerous/temporary optimisation - if nothing to do, then do nothing
1162                 if ( mlt_properties_get_int( properties, "no_alpha" ) &&
1163                          result.item.x == 0 && result.item.y == 0 && result.item.w == *width && result.item.h == *height && result.item.mix == 100 )
1164                 {
1165                         mlt_frame_get_image( b_frame, image, format, width, height, 1 );
1166                         if ( !mlt_frame_is_test_card( a_frame ) )
1167                                 mlt_frame_replace_image( a_frame, *image, *format, *width, *height );
1168                         return 0;
1169                 }
1170
1171                 if ( a_frame == b_frame )
1172                 {
1173                         double aspect_ratio = mlt_frame_get_aspect_ratio( b_frame );
1174                         get_b_frame_image( self, b_frame, &image_b, &width_b, &height_b, &result );
1175                         alpha_b = mlt_frame_get_alpha_mask( b_frame );
1176                         mlt_properties_set_double( a_props, "aspect_ratio", aspect_ratio );
1177                 }
1178
1179                 // Get the image from the a frame
1180                 mlt_frame_get_image( a_frame, invert ? &image_b : image, format, width, height, 1 );
1181                 alpha_a = mlt_frame_get_alpha_mask( a_frame );
1182
1183                 // Optimisation - no compositing required
1184                 if ( result.item.mix == 0 || ( result.item.w == 0 && result.item.h == 0 ) )
1185                         return 0;
1186
1187                 // Need to keep the width/height of the a_frame on the b_frame for titling
1188                 if ( mlt_properties_get( a_props, "dest_width" ) == NULL )
1189                 {
1190                         mlt_properties_set_int( a_props, "dest_width", *width );
1191                         mlt_properties_set_int( a_props, "dest_height", *height );
1192                         mlt_properties_set_int( b_props, "dest_width", *width );
1193                         mlt_properties_set_int( b_props, "dest_height", *height );
1194                 }
1195                 else
1196                 {
1197                         mlt_properties_set_int( b_props, "dest_width", mlt_properties_get_int( a_props, "dest_width" ) );
1198                         mlt_properties_set_int( b_props, "dest_height", mlt_properties_get_int( a_props, "dest_height" ) );
1199                 }
1200
1201                 // Special case for titling...
1202                 if ( mlt_properties_get_int( properties, "titles" ) )
1203                 {
1204                         if ( mlt_properties_get( b_props, "rescale.interp" ) == NULL )
1205                                 mlt_properties_set( b_props, "rescale.interp", "hyper" );
1206                         width_b = mlt_properties_get_int( a_props, "dest_width" );
1207                         height_b = mlt_properties_get_int( a_props, "dest_height" );
1208                 }
1209
1210                 if ( *image != image_b && ( ( invert ? 0 : image_b ) || get_b_frame_image( self, b_frame, invert ? image : &image_b, &width_b, &height_b, &result ) == 0 ) )
1211                 {
1212                         uint8_t *dest = *image;
1213                         uint8_t *src = image_b;
1214                         int progressive =
1215                                         mlt_properties_get_int( a_props, "consumer_deinterlace" ) ||
1216                                         mlt_properties_get_int( properties, "progressive" );
1217                         int field;
1218
1219                         double luma_softness = mlt_properties_get_double( properties, "softness" );
1220                         mlt_service_lock( MLT_TRANSITION_SERVICE( self ) );
1221                         uint16_t *luma_bitmap = get_luma( self, properties, width_b, height_b );
1222                         mlt_service_unlock( MLT_TRANSITION_SERVICE( self ) );
1223                         char *operator = mlt_properties_get( properties, "operator" );
1224
1225                         alpha_b = alpha_b == NULL ? mlt_frame_get_alpha_mask( b_frame ) : alpha_b;
1226
1227                         composite_line_fn line_fn = composite_line_yuv;
1228
1229                         // Replacement and override
1230                         if ( operator != NULL )
1231                         {
1232                                 if ( !strcmp( operator, "or" ) )
1233                                         line_fn = composite_line_yuv_or;
1234                                 if ( !strcmp( operator, "and" ) )
1235                                         line_fn = composite_line_yuv_and;
1236                                 if ( !strcmp( operator, "xor" ) )
1237                                         line_fn = composite_line_yuv_xor;
1238                         }
1239
1240                         // Allow the user to completely obliterate the alpha channels from both frames
1241                         if ( mlt_properties_get( properties, "alpha_a" ) )
1242                                 memset( alpha_a, mlt_properties_get_int( properties, "alpha_a" ), *width * *height );
1243
1244                         if ( mlt_properties_get( properties, "alpha_b" ) )
1245                                 memset( alpha_b, mlt_properties_get_int( properties, "alpha_b" ), width_b * height_b );
1246
1247                         for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
1248                         {
1249                                 // Assume lower field (0) first
1250                                 double field_position = position + field * delta * length;
1251
1252                                 // Do the calculation if we need to
1253                                 // NB: Locks needed here since the properties are being modified
1254                                 mlt_service_lock( MLT_TRANSITION_SERVICE( self ) );
1255                                 composite_calculate( self, &result, invert ? b_frame : a_frame, field_position );
1256                                 mlt_service_unlock( MLT_TRANSITION_SERVICE( self ) );
1257
1258                                 if ( mlt_properties_get_int( properties, "titles" ) )
1259                                 {
1260                                         result.item.w = rint( *width * ( result.item.w / result.nw ) );
1261                                         result.nw = result.item.w;
1262                                         result.item.h = rint( *height * ( result.item.h / result.nh ) );
1263                                         result.nh = *height;
1264                                         result.sw = width_b;
1265                                         result.sh = height_b;
1266                                 }
1267
1268                                 // Enforce cropping
1269                                 if ( mlt_properties_get( properties, "crop" ) )
1270                                 {
1271                                         if ( result.x_src == 0 )
1272                                                 width_b = width_b > result.item.w ? result.item.w : width_b;
1273                                         if ( result.y_src == 0 )
1274                                                 height_b = height_b > result.item.h ? result.item.h : height_b;
1275                                 }
1276                                 else
1277                                 {
1278                                         // Otherwise, align
1279                                         alignment_calculate( &result );
1280                                 }
1281
1282                                 // Composite the b_frame on the a_frame
1283                                 if ( invert )
1284                                         composite_yuv( dest, width_b, height_b, src, *width, *height, alpha_a, alpha_b, result, progressive ? -1 : field, luma_bitmap, luma_softness, line_fn );
1285                                 else
1286                                         composite_yuv( dest, *width, *height, src, width_b, height_b, alpha_b, alpha_a, result, progressive ? -1 : field, luma_bitmap, luma_softness, line_fn );
1287                         }
1288                 }
1289         }
1290         else
1291         {
1292                 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
1293         }
1294
1295         return 0;
1296 }
1297
1298 /** Composition transition processing.
1299 */
1300
1301 static mlt_frame composite_process( mlt_transition self, mlt_frame a_frame, mlt_frame b_frame )
1302 {
1303         // UGH - this is a TODO - find a more reliable means of obtaining in/out for the always_active case
1304         if ( mlt_properties_get_int(  MLT_TRANSITION_PROPERTIES( self ), "always_active" ) == 0 )
1305         {
1306                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( self ), "in" ) );
1307                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( self ), "out" ) );
1308                 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( a_frame ), position_calculate( self, mlt_frame_get_position( a_frame ) ) );
1309         }
1310         else
1311         {
1312                 mlt_properties props = mlt_properties_get_data( MLT_FRAME_PROPERTIES( b_frame ), "_producer", NULL );
1313                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( props, "in" ) );
1314                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( props, "out" ) );
1315                 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( a_frame ), mlt_properties_get_int( props, "_frame" ) - mlt_properties_get_int( props, "in" ) );
1316         }
1317
1318         mlt_frame_push_service( a_frame, self );
1319         mlt_frame_push_frame( a_frame, b_frame );
1320         mlt_frame_push_get_image( a_frame, transition_get_image );
1321         return a_frame;
1322 }
1323
1324 /** Constructor for the filter.
1325 */
1326
1327 mlt_transition transition_composite_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
1328 {
1329         mlt_transition self = calloc( 1, sizeof( struct mlt_transition_s ) );
1330         if ( self != NULL && mlt_transition_init( self, NULL ) == 0 )
1331         {
1332                 mlt_properties properties = MLT_TRANSITION_PROPERTIES( self );
1333
1334                 self->process = composite_process;
1335
1336                 // Default starting motion and zoom
1337                 mlt_properties_set( properties, "start", arg != NULL ? arg : "0/0:100%x100%" );
1338
1339                 // Default factory
1340                 mlt_properties_set( properties, "factory", mlt_environment( "MLT_PRODUCER" ) );
1341
1342                 // Use alignment (and hence alpha of b frame)
1343                 mlt_properties_set_int( properties, "aligned", 1 );
1344
1345                 // Default to progressive rendering
1346                 mlt_properties_set_int( properties, "progressive", 1 );
1347
1348                 // Inform apps and framework that this is a video only transition
1349                 mlt_properties_set_int( properties, "_transition_type", 1 );
1350         }
1351         return self;
1352 }