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 );
  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 this, struct geometry_s *output, double position )
  70 {
  71         mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
  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 this, 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( this );
  97
  98         // Create an empty geometries object
  99         mlt_geometry geometry = mlt_geometry_init( );
 100
 101         // Get the in and out position
 102         mlt_position in = mlt_transition_get_in( this );
 103         mlt_position out = mlt_transition_get_out( this );
 104         int length = out - in + 1;
 105         double cycle = mlt_properties_get_double( properties, "cycle" );
 106
 107         // Get the new style geometry string
 108         char *property = mlt_properties_get( properties, "geometry" );
 109
 110         // Allow a geometry repeat cycle
 111         if ( cycle >= 1 )
 112                 length = cycle;
 113         else if ( cycle > 0 )
 114                 length *= cycle;
 115
 116         // Parse the geometry if we have one
 117         mlt_geometry_parse( geometry, property, length, normalised_width, normalised_height );
 118
 119         // Check if we're using the old style geometry
 120         if ( property == NULL )
 121         {
 122                 // DEPRECATED: Multiple keys for geometry information is inefficient and too rigid for
 123                 // practical use - while deprecated, it has been slightly extended too - keys can now
 124                 // be specified out of order, and can be blanked or NULL to simulate removal
 125
 126                 // Structure to use for parsing and inserting
 127                 struct mlt_geometry_item_s item;
 128
 129                 // Parse the start property
 130                 item.frame = 0;
 131                 if ( mlt_geometry_parse_item( geometry, &item, mlt_properties_get( properties, "start" ) ) == 0 )
 132                         mlt_geometry_insert( geometry, &item );
 133
 134                 // Parse the keys in between
 135                 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
 136                 {
 137                         // Get the name of the property
 138                         char *name = mlt_properties_get_name( properties, i );
 139
 140                         // Check that it's valid
 141                         if ( !strncmp( name, "key[", 4 ) )
 142                         {
 143                                 // Get the value of the property
 144                                 char *value = mlt_properties_get_value( properties, i );
 145
 146                                 // Determine the frame number
 147                                 item.frame = atoi( name + 4 );
 148
 149                                 // Parse and add to the list
 150                                 if ( mlt_geometry_parse_item( geometry, &item, value ) == 0 )
 151                                         mlt_geometry_insert( geometry, &item );
 152                                 else
 153                                         fprintf( stderr, "Invalid Key - skipping %s = %s\n", name, value );
 154                         }
 155                 }
 156
 157                 // Parse the end
 158                 item.frame = -1;
 159                 if ( mlt_geometry_parse_item( geometry, &item, mlt_properties_get( properties, "end" ) ) == 0 )
 160                         mlt_geometry_insert( geometry, &item );
 161         }
 162
 163         return geometry;
 164 }
 165
 166 /** Adjust position according to scaled size and alignment properties.
 167 */
 168
 169 static void alignment_calculate( struct geometry_s *geometry )
 170 {
 171         geometry->item.x += ( geometry->item.w - geometry->sw ) * geometry->halign / 2;
 172         geometry->item.y += ( geometry->item.h - geometry->sh ) * geometry->valign / 2;
 173 }
 174
 175 /** Calculate the position for this frame.
 176 */
 177
 178 static int position_calculate( mlt_transition this, mlt_position position )
 179 {
 180         // Get the in and out position
 181         mlt_position in = mlt_transition_get_in( this );
 182
 183         // Now do the calcs
 184         return position - in;
 185 }
 186
 187 /** Calculate the field delta for this frame - position between two frames.
 188 */
 189
 190 static inline double delta_calculate( mlt_transition this, mlt_frame frame, mlt_position position )
 191 {
 192         // Get the in and out position
 193         mlt_position in = mlt_transition_get_in( this );
 194         mlt_position out = mlt_transition_get_out( this );
 195         double length = out - in + 1;
 196
 197         // Now do the calcs
 198         double x = ( double )( position - in ) / length;
 199         double y = ( double )( position + 1 - in ) / length;
 200
 201         return length * ( y - x ) / 2.0;
 202 }
 203
 204 static int get_value( mlt_properties properties, const char *preferred, const char *fallback )
 205 {
 206         int value = mlt_properties_get_int( properties, preferred );
 207         if ( value == 0 )
 208                 value = mlt_properties_get_int( properties, fallback );
 209         return value;
 210 }
 211
 212 /** A linear threshold determination function.
 213 */
 214
 215 static inline int32_t linearstep( int32_t edge1, int32_t edge2, int32_t a )
 216 {
 217         if ( a < edge1 )
 218                 return 0;
 219
 220         if ( a >= edge2 )
 221                 return 0x10000;
 222
 223         return ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
 224 }
 225
 226 /** A smoother, non-linear threshold determination function.
 227 */
 228
 229 static inline int32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
 230 {
 231         if ( a < edge1 )
 232                 return 0;
 233
 234         if ( a >= edge2 )
 235                 return 0x10000;
 236
 237         a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
 238
 239         return ( ( ( a * a ) >> 16 )  * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
 240 }
 241
 242 /** Load the luma map from PGM stream.
 243 */
 244
 245 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
 246 {
 247         uint8_t *data = NULL;
 248         while (1)
 249         {
 250                 char line[128];
 251                 char comment[128];
 252                 int i = 2;
 253                 int maxval;
 254                 int bpp;
 255                 uint16_t *p;
 256
 257                 line[127] = '\0';
 258
 259                 // get the magic code
 260                 if ( fgets( line, 127, f ) == NULL )
 261                         break;
 262
 263                 // skip comments
 264                 while ( sscanf( line, " #%s", comment ) > 0 )
 265                         if ( fgets( line, 127, f ) == NULL )
 266                                 break;
 267
 268                 if ( line[0] != 'P' || line[1] != '5' )
 269                         break;
 270
 271                 // skip white space and see if a new line must be fetched
 272                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 273                 if ( ( line[i] == '\0' || line[i] == '#' ) && fgets( line, 127, f ) == NULL )
 274                         break;
 275
 276                 // skip comments
 277                 while ( sscanf( line, " #%s", comment ) > 0 )
 278                         if ( fgets( line, 127, f ) == NULL )
 279                                 break;
 280
 281                 // get the dimensions
 282                 if ( line[0] == 'P' )
 283                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 284                 else
 285                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 286
 287                 // get the height value, if not yet
 288                 if ( i < 2 )
 289                 {
 290                         if ( fgets( line, 127, f ) == NULL )
 291                                 break;
 292
 293                         // skip comments
 294                         while ( sscanf( line, " #%s", comment ) > 0 )
 295                                 if ( fgets( line, 127, f ) == NULL )
 296                                         break;
 297
 298                         i = sscanf( line, "%d", height );
 299                         if ( i == 0 )
 300                                 break;
 301                         else
 302                                 i = 2;
 303                 }
 304
 305                 // get the maximum gray value, if not yet
 306                 if ( i < 3 )
 307                 {
 308                         if ( fgets( line, 127, f ) == NULL )
 309                                 break;
 310
 311                         // skip comments
 312                         while ( sscanf( line, " #%s", comment ) > 0 )
 313                                 if ( fgets( line, 127, f ) == NULL )
 314                                         break;
 315
 316                         i = sscanf( line, "%d", &maxval );
 317                         if ( i == 0 )
 318                                 break;
 319                 }
 320
 321                 // determine if this is one or two bytes per pixel
 322                 bpp = maxval > 255 ? 2 : 1;
 323
 324                 // allocate temporary storage for the raw data
 325                 data = mlt_pool_alloc( *width * *height * bpp );
 326                 if ( data == NULL )
 327                         break;
 328
 329                 // read the raw data
 330                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 331                         break;
 332
 333                 // allocate the luma bitmap
 334                 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
 335                 if ( *map == NULL )
 336                         break;
 337
 338                 // proces the raw data into the luma bitmap
 339                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 340                 {
 341                         if ( bpp == 1 )
 342                                 *p++ = data[ i ] << 8;
 343                         else
 344                                 *p++ = ( data[ i ] << 8 ) + data[ i + 1 ];
 345                 }
 346
 347                 break;
 348         }
 349
 350         if ( data != NULL )
 351                 mlt_pool_release( data );
 352 }
 353
 354 /** Generate a luma map from any YUV image.
 355 */
 356
 357 static void luma_read_yuv422( uint8_t *image, uint16_t **map, int width, int height )
 358 {
 359         int i;
 360
 361         // allocate the luma bitmap
 362         uint16_t *p = *map = ( uint16_t* )mlt_pool_alloc( width * height * sizeof( uint16_t ) );
 363         if ( *map == NULL )
 364                 return;
 365
 366         // proces the image data into the luma bitmap
 367         for ( i = 0; i < width * height * 2; i += 2 )
 368                 *p++ = ( image[ i ] - 16 ) * 299; // 299 = 65535 / 219
 369 }
 370
 371 static inline int calculate_mix( uint16_t *luma, int j, int soft, int weight, int alpha )
 372 {
 373         return ( ( ( luma == NULL ) ? weight : smoothstep( luma[ j ], luma[ j ] + soft, weight + soft ) ) * alpha ) >> 8;
 374 }
 375
 376 static inline uint8_t sample_mix( uint8_t dest, uint8_t src, int mix )
 377 {
 378         return ( src * mix + dest * ( ( 1 << 16 ) - mix ) ) >> 16;
 379 }
 380
 381 /** Composite a source line over a destination line
 382 */
 383
 384 static 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 )
 385 {
 386         register int j;
 387         register int mix;
 388
 389         for ( j = 0; j < width; j ++ )
 390         {
 391                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++ );
 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 )
 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 );
 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 )
 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 );
 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 )
 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 );
 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, int32_t 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         int32_t weight = ( ( 1 << 16 ) - 1 ) * ( geometry.item.mix / 100 );
 459         int step = ( field > -1 ) ? 2 : 1;
 460         int bpp = 2;
 461         int stride_src = geometry.sw * bpp;
 462         int stride_dest = width_dest * bpp;
 463
 464         // Adjust to consumer scale
 465         int x = rint( geometry.item.x * width_dest / geometry.nw );
 466         int y = rint( geometry.item.y * height_dest / geometry.nh );
 467         int uneven_x = ( x % 2 );
 468
 469         // optimization points - no work to do
 470         if ( width_src <= 0 || height_src <= 0 || y_src >= height_src || x_src >= width_src )
 471                 return ret;
 472
 473         if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
 474                 return ret;
 475
 476         // cropping affects the source width
 477         if ( x_src > 0 )
 478         {
 479                 width_src -= x_src;
 480                 // and it implies cropping
 481                 if ( width_src > geometry.item.w )
 482                         width_src = geometry.item.w;
 483         }
 484
 485         // cropping affects the source height
 486         if ( y_src > 0 )
 487         {
 488                 height_src -= y_src;
 489                 // and it implies cropping
 490                 if ( height_src > geometry.item.h )
 491                         height_src = geometry.item.h;
 492         }
 493
 494         // crop overlay off the left edge of frame
 495         if ( x < 0 )
 496         {
 497                 x_src = -x;
 498                 width_src -= x_src;
 499                 x = 0;
 500         }
 501
 502         // crop overlay beyond right edge of frame
 503         if ( x + width_src > width_dest )
 504                 width_src = width_dest - x;
 505
 506         // crop overlay off the top edge of the frame
 507         if ( y < 0 )
 508         {
 509                 y_src = -y;
 510                 height_src -= y_src;
 511                 y = 0;
 512         }
 513
 514         // crop overlay below bottom edge of frame
 515         if ( y + height_src > height_dest )
 516                 height_src = height_dest - y;
 517
 518         // offset pointer into overlay buffer based on cropping
 519         p_src += x_src * bpp + y_src * stride_src;
 520
 521         // offset pointer into frame buffer based upon positive coordinates only!
 522         p_dest += ( x < 0 ? 0 : x ) * bpp + ( y < 0 ? 0 : y ) * stride_dest;
 523
 524         // offset pointer into alpha channel based upon cropping
 525         alpha_b += x_src + y_src * stride_src / bpp;
 526         alpha_a += x + y * stride_dest / bpp;
 527
 528         // offset pointer into luma channel based upon cropping
 529         if ( p_luma )
 530                 p_luma += x_src + y_src * stride_src / bpp;
 531
 532         // Assuming lower field first
 533         // Special care is taken to make sure the b_frame is aligned to the correct field.
 534         // field 0 = lower field and y should be odd (y is 0-based).
 535         // field 1 = upper field and y should be even.
 536         if ( ( field > -1 ) && ( y % 2 == field ) )
 537         {
 538                 if ( ( field == 1 && y < height_dest - 1 ) || ( field == 0 && y == 0 ) )
 539                         p_dest += stride_dest;
 540                 else
 541                         p_dest -= stride_dest;
 542         }
 543
 544         // On the second field, use the other lines from b_frame
 545         if ( field == 1 )
 546         {
 547                 p_src += stride_src;
 548                 alpha_b += stride_src / bpp;
 549                 alpha_a += stride_dest / bpp;
 550                 height_src--;
 551         }
 552
 553         stride_src *= step;
 554         stride_dest *= step;
 555         int alpha_b_stride = stride_src / bpp;
 556         int alpha_a_stride = stride_dest / bpp;
 557
 558         // Align chroma of source and destination
 559         if ( uneven_x != uneven_x_src )
 560         {
 561                 p_src += 2;
 562                 width_src -= 2;
 563                 alpha_b += 1;
 564         }
 565
 566         // now do the compositing only to cropped extents
 567         for ( i = 0; i < height_src; i += step )
 568         {
 569                 line_fn( p_dest, p_src, width_src, alpha_b, alpha_a, weight, p_luma, softness );
 570
 571                 p_src += stride_src;
 572                 p_dest += stride_dest;
 573                 alpha_b += alpha_b_stride;
 574                 alpha_a += alpha_a_stride;
 575                 if ( p_luma )
 576                         p_luma += alpha_b_stride;
 577         }
 578
 579         return ret;
 580 }
 581
 582
 583 /** Scale 16bit greyscale luma map using nearest neighbor.
 584 */
 585
 586 static inline void
 587 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 )
 588 {
 589         register int i, j;
 590         register int x_step = ( src_width << 16 ) / dest_width;
 591         register int y_step = ( src_height << 16 ) / dest_height;
 592         register int x, y = 0;
 593
 594         for ( i = 0; i < dest_height; i++ )
 595         {
 596                 const uint16_t *src = src_buf + ( y >> 16 ) * src_width;
 597                 x = 0;
 598
 599                 for ( j = 0; j < dest_width; j++ )
 600                 {
 601                         *dest_buf++ = src[ x >> 16 ] ^ invert;
 602                         x += x_step;
 603                 }
 604                 y += y_step;
 605         }
 606 }
 607
 608 static uint16_t* get_luma( mlt_transition this, mlt_properties properties, int width, int height )
 609 {
 610         // The cached luma map information
 611         int luma_width = mlt_properties_get_int( properties, "_luma.width" );
 612         int luma_height = mlt_properties_get_int( properties, "_luma.height" );
 613         uint16_t *luma_bitmap = mlt_properties_get_data( properties, "_luma.bitmap", NULL );
 614         int invert = mlt_properties_get_int( properties, "luma_invert" );
 615
 616         // If the filename property changed, reload the map
 617         char *resource = mlt_properties_get( properties, "luma" );
 618
 619         char temp[ 512 ];
 620
 621         if ( luma_width == 0 || luma_height == 0 )
 622         {
 623                 luma_width = width;
 624                 luma_height = height;
 625         }
 626
 627         if ( resource && resource[0] && strchr( resource, '%' ) )
 628         {
 629                 // TODO: Clean up quick and dirty compressed/existence check
 630                 FILE *test;
 631                 sprintf( temp, "%s/lumas/%s/%s", mlt_environment( "MLT_DATA" ), mlt_environment( "MLT_NORMALISATION" ), strchr( resource, '%' ) + 1 );
 632                 test = fopen( temp, "r" );
 633                 if ( test == NULL )
 634                         strcat( temp, ".png" );
 635                 else
 636                         fclose( test );
 637                 resource = temp;
 638         }
 639
 640         if ( resource && resource[0] )
 641         {
 642                 char *old_luma = mlt_properties_get( properties, "_luma" );
 643                 int old_invert = mlt_properties_get_int( properties, "_luma_invert" );
 644
 645                 if ( invert != old_invert || ( old_luma && old_luma[0] && strcmp( resource, old_luma ) ) )
 646                 {
 647                         mlt_properties_set_data( properties, "_luma.orig_bitmap", NULL, 0, NULL, NULL );
 648                         luma_bitmap = NULL;
 649                 }
 650         }
 651         else {
 652                 char *old_luma = mlt_properties_get( properties, "_luma" );
 653                 if ( old_luma && old_luma[0] )
 654                 {
 655                         mlt_properties_set_data( properties, "_luma.orig_bitmap", NULL, 0, NULL, NULL );
 656                         luma_bitmap = NULL;
 657                         mlt_properties_set( properties, "_luma", NULL);
 658                 }
 659         }
 660
 661         if ( resource && resource[0] && ( luma_bitmap == NULL || luma_width != width || luma_height != height ) )
 662         {
 663                 uint16_t *orig_bitmap = mlt_properties_get_data( properties, "_luma.orig_bitmap", NULL );
 664                 luma_width = mlt_properties_get_int( properties, "_luma.orig_width" );
 665                 luma_height = mlt_properties_get_int( properties, "_luma.orig_height" );
 666
 667                 // Load the original luma once
 668                 if ( orig_bitmap == NULL )
 669                 {
 670                         char *extension = strrchr( resource, '.' );
 671
 672                         // See if it is a PGM
 673                         if ( extension != NULL && strcmp( extension, ".pgm" ) == 0 )
 674                         {
 675                                 // Open PGM
 676                                 FILE *f = fopen( resource, "r" );
 677                                 if ( f != NULL )
 678                                 {
 679                                         // Load from PGM
 680                                         luma_read_pgm( f, &orig_bitmap, &luma_width, &luma_height );
 681                                         fclose( f );
 682
 683                                         // Remember the original size for subsequent scaling
 684                                         mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
 685                                         mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
 686                                         mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
 687                                 }
 688                         }
 689                         else
 690                         {
 691                                 // Get the factory producer service
 692                                 char *factory = mlt_properties_get( properties, "factory" );
 693
 694                                 // Create the producer
 695                                 mlt_profile profile = mlt_service_profile( MLT_TRANSITION_SERVICE( this ) );
 696                                 mlt_producer producer = mlt_factory_producer( profile, factory, resource );
 697
 698                                 // If we have one
 699                                 if ( producer != NULL )
 700                                 {
 701                                         // Get the producer properties
 702                                         mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
 703
 704                                         // Ensure that we loop
 705                                         mlt_properties_set( producer_properties, "eof", "loop" );
 706
 707                                         // Now pass all producer. properties on the transition down
 708                                         mlt_properties_pass( producer_properties, properties, "luma." );
 709
 710                                         // We will get the alpha frame from the producer
 711                                         mlt_frame luma_frame = NULL;
 712
 713                                         // Get the luma frame
 714                                         if ( mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &luma_frame, 0 ) == 0 )
 715                                         {
 716                                                 uint8_t *luma_image;
 717                                                 mlt_image_format luma_format = mlt_image_yuv422;
 718
 719                                                 // Get image from the luma producer
 720                                                 mlt_properties_set( MLT_FRAME_PROPERTIES( luma_frame ), "rescale.interp", "none" );
 721                                                 mlt_frame_get_image( luma_frame, &luma_image, &luma_format, &luma_width, &luma_height, 0 );
 722
 723                                                 // Generate the luma map
 724                                                 if ( luma_image != NULL && luma_format == mlt_image_yuv422 )
 725                                                         luma_read_yuv422( luma_image, &orig_bitmap, luma_width, luma_height );
 726
 727                                                 // Remember the original size for subsequent scaling
 728                                                 mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
 729                                                 mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
 730                                                 mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
 731
 732                                                 // Cleanup the luma frame
 733                                                 mlt_frame_close( luma_frame );
 734                                         }
 735
 736                                         // Cleanup the luma producer
 737                                         mlt_producer_close( producer );
 738                                 }
 739                         }
 740                 }
 741                 // Scale luma map
 742                 luma_bitmap = mlt_pool_alloc( width * height * sizeof( uint16_t ) );
 743                 scale_luma( luma_bitmap, width, height, orig_bitmap, luma_width, luma_height, invert * ( ( 1 << 16 ) - 1 ) );
 744
 745                 // Remember the scaled luma size to prevent unnecessary scaling
 746                 mlt_properties_set_int( properties, "_luma.width", width );
 747                 mlt_properties_set_int( properties, "_luma.height", height );
 748                 mlt_properties_set_data( properties, "_luma.bitmap", luma_bitmap, width * height * 2, mlt_pool_release, NULL );
 749                 mlt_properties_set( properties, "_luma", resource );
 750                 mlt_properties_set_int( properties, "_luma_invert", invert );
 751         }
 752         return luma_bitmap;
 753 }
 754
 755 /** Get the properly sized image from b_frame.
 756 */
 757
 758 static int get_b_frame_image( mlt_transition this, mlt_frame b_frame, uint8_t **image, int *width, int *height, struct geometry_s *geometry )
 759 {
 760         int ret = 0;
 761         mlt_image_format format = mlt_image_yuv422;
 762
 763         // Get the properties objects
 764         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 765         mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
 766         uint8_t resize_alpha = mlt_properties_get_int( b_props, "resize_alpha" );
 767
 768         // Do not scale if we are cropping - the compositing rectangle can crop the b image
 769         // TODO: Use the animatable w and h of the crop geometry to scale independently of crop rectangle
 770         if ( mlt_properties_get( properties, "crop" ) )
 771         {
 772                 int real_width = get_value( b_props, "real_width", "width" );
 773                 int real_height = get_value( b_props, "real_height", "height" );
 774                 double input_ar = mlt_properties_get_double( b_props, "aspect_ratio" );
 775                 double consumer_ar = mlt_properties_get_double( b_props, "consumer_aspect_ratio" );
 776                 double background_ar = mlt_properties_get_double( b_props, "output_ratio" );
 777                 double output_ar = background_ar != 0.0 ? background_ar : consumer_ar;
 778                 int scaled_width = rint( ( input_ar == 0.0 ? output_ar : input_ar ) / output_ar * real_width );
 779                 int scaled_height = real_height;
 780                 geometry->sw = scaled_width;
 781                 geometry->sh = scaled_height;
 782         }
 783         // Normalise aspect ratios and scale preserving aspect ratio
 784         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 )
 785         {
 786                 // Adjust b_frame pixel aspect
 787                 int normalised_width = geometry->item.w;
 788                 int normalised_height = geometry->item.h;
 789                 int real_width = get_value( b_props, "real_width", "width" );
 790                 int real_height = get_value( b_props, "real_height", "height" );
 791                 double input_ar = mlt_properties_get_double( b_props, "aspect_ratio" );
 792                 double consumer_ar = mlt_properties_get_double( b_props, "consumer_aspect_ratio" );
 793                 double background_ar = mlt_properties_get_double( b_props, "output_ratio" );
 794                 double output_ar = background_ar != 0.0 ? background_ar : consumer_ar;
 795                 int scaled_width = rint( ( input_ar == 0.0 ? output_ar : input_ar ) / output_ar * real_width );
 796                 int scaled_height = real_height;
 797 // fprintf(stderr, "%s: scaled %dx%d norm %dx%d real %dx%d output_ar %f => %f\n", __FILE__,
 798 // scaled_width, scaled_height, normalised_width, normalised_height, real_width, real_height,
 799 // background_ar, output_ar);
 800
 801                 // Now ensure that our images fit in the normalised frame
 802                 if ( scaled_width > normalised_width )
 803                 {
 804                         scaled_height = rint( scaled_height * normalised_width / scaled_width );
 805                         scaled_width = normalised_width;
 806                 }
 807                 if ( scaled_height > normalised_height )
 808                 {
 809                         scaled_width = rint( scaled_width * normalised_height / scaled_height );
 810                         scaled_height = normalised_height;
 811                 }
 812
 813                 // Honour the fill request - this will scale the image to fill width or height while maintaining a/r
 814                 // ????: Shouln't this be the default behaviour?
 815                 if ( mlt_properties_get_int( properties, "fill" ) && scaled_width > 0 && scaled_height > 0 )
 816                 {
 817                         if ( scaled_height < normalised_height && scaled_width * normalised_height / scaled_height <= normalised_width )
 818                         {
 819                                 scaled_width = rint( scaled_width * normalised_height / scaled_height );
 820                                 scaled_height = normalised_height;
 821                         }
 822                         else if ( scaled_width < normalised_width && scaled_height * normalised_width / scaled_width < normalised_height )
 823                         {
 824                                 scaled_height = rint( scaled_height * normalised_width / scaled_width );
 825                                 scaled_width = normalised_width;
 826                         }
 827                 }
 828
 829                 // Save the new scaled dimensions
 830                 geometry->sw = scaled_width;
 831                 geometry->sh = scaled_height;
 832         }
 833         else
 834         {
 835                 geometry->sw = geometry->item.w;
 836                 geometry->sh = geometry->item.h;
 837         }
 838
 839         // We want to ensure that we bypass resize now...
 840         if ( resize_alpha == 0 )
 841                 mlt_properties_set_int( b_props, "distort", mlt_properties_get_int( properties, "distort" ) );
 842
 843         // If we're not aligned, we want a non-transparent background
 844         if ( mlt_properties_get_int( properties, "aligned" ) == 0 )
 845                 mlt_properties_set_int( b_props, "resize_alpha", 255 );
 846
 847         // Take into consideration alignment for optimisation (titles are a special case)
 848         if ( !mlt_properties_get_int( properties, "titles" ) &&
 849                  mlt_properties_get( properties, "crop" ) == NULL )
 850                 alignment_calculate( geometry );
 851
 852         // Adjust to consumer scale
 853         *width = rint( geometry->sw * *width / geometry->nw );
 854         *height = rint( geometry->sh * *height / geometry->nh );
 855 // fprintf(stderr, "%s: scaled %dx%d norm %dx%d resize %dx%d\n", __FILE__,
 856 // geometry->sw, geometry->sh, geometry->nw, geometry->nh, *width, *height);
 857
 858         ret = mlt_frame_get_image( b_frame, image, &format, width, height, 1 );
 859
 860         // Set the frame back
 861         mlt_properties_set_int( b_props, "resize_alpha", resize_alpha );
 862
 863         return ret && image != NULL;
 864 }
 865
 866 static void crop_calculate( mlt_transition this, mlt_properties properties, struct geometry_s *result, double position )
 867 {
 868         // Initialize panning info
 869         result->x_src = 0;
 870         result->y_src = 0;
 871         if ( mlt_properties_get( properties, "crop" ) )
 872         {
 873                 mlt_geometry crop = mlt_properties_get_data( properties, "crop_geometry", NULL );
 874                 if ( !crop )
 875                 {
 876                         crop = mlt_geometry_init();
 877                         mlt_position in = mlt_transition_get_in( this );
 878                         mlt_position out = mlt_transition_get_out( this );
 879                         int length = out - in + 1;
 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 this, 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( this );
 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         int normalised_width = mlt_properties_get_int( a_props, "normalised_width" );
 924         int normalised_height = mlt_properties_get_int( a_props, "normalised_height" );
 925
 926         char *name = mlt_properties_get( properties, "_unique_id" );
 927         char key[ 256 ];
 928
 929         sprintf( key, "%s.in", name );
 930         if ( mlt_properties_get( a_props, key ) )
 931         {
 932                 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 );
 933         }
 934         else
 935         {
 936                 // Now parse the geometries
 937                 if ( start == NULL )
 938                 {
 939                         // Parse the transitions properties
 940                         start = transition_parse_keys( this, normalised_width, normalised_height );
 941
 942                         // Assign to properties to ensure we get destroyed
 943                         mlt_properties_set_data( properties, "geometries", start, 0, ( mlt_destructor )mlt_geometry_close, NULL );
 944                 }
 945                 else
 946                 {
 947                         int length = mlt_transition_get_out( this ) - mlt_transition_get_in( this ) + 1;
 948                         double cycle = mlt_properties_get_double( properties, "cycle" );
 949                         if ( cycle > 1 )
 950                                 length = cycle;
 951                         else if ( cycle > 0 )
 952                                 length *= cycle;
 953                         mlt_geometry_refresh( start, mlt_properties_get( properties, "geometry" ), length, normalised_width, normalised_height );
 954                 }
 955
 956                 // Do the calculation
 957                 geometry_calculate( this, result, position );
 958
 959                 // Assign normalised info
 960                 result->nw = normalised_width;
 961                 result->nh = normalised_height;
 962         }
 963
 964         // Now parse the alignment
 965         result->halign = alignment_parse( mlt_properties_get( properties, "halign" ) );
 966         result->valign = alignment_parse( mlt_properties_get( properties, "valign" ) );
 967
 968         crop_calculate( this, properties, result, position );
 969
 970         return start;
 971 }
 972
 973 mlt_frame composite_copy_region( mlt_transition this, mlt_frame a_frame, mlt_position frame_position )
 974 {
 975         // Create a frame to return
 976         mlt_frame b_frame = mlt_frame_init( MLT_TRANSITION_SERVICE( this ) );
 977
 978         // Get the properties of the a frame
 979         mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
 980
 981         // Get the properties of the b frame
 982         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
 983
 984         // Get the position
 985         int position = position_calculate( this, frame_position );
 986
 987         // Get the unique id of the transition
 988         char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( this ), "_unique_id" );
 989         char key[ 256 ];
 990
 991         // Destination image
 992         uint8_t *dest = NULL;
 993
 994         // Get the image and dimensions
 995         uint8_t *image = mlt_properties_get_data( a_props, "image", NULL );
 996         int width = mlt_properties_get_int( a_props, "width" );
 997         int height = mlt_properties_get_int( a_props, "height" );
 998         int format = mlt_properties_get_int( a_props, "format" );
 999
1000         // Pointers for copy operation
1001         uint8_t *p;
1002
1003         // Coordinates
1004         int w = 0;
1005         int h = 0;
1006         int x = 0;
1007         int y = 0;
1008
1009         int ss = 0;
1010         int ds = 0;
1011
1012         // Will need to know region to copy
1013         struct geometry_s result;
1014
1015         // Calculate the region now
1016         composite_calculate( this, &result, a_frame, position );
1017
1018         // Need to scale down to actual dimensions
1019         x = rint( result.item.x * width / result.nw );
1020         y = rint( result.item.y * height / result.nh );
1021         w = rint( result.item.w * width / result.nw );
1022         h = rint( result.item.h * height / result.nh );
1023
1024         if ( x % 2 )
1025         {
1026                 x --;
1027                 w ++;
1028         }
1029
1030         // Store the key
1031         sprintf( key, "%s.in=%d,%d,%d,%d,%f,%d,%d", name, x, y, w, h, result.item.mix, width, height );
1032         mlt_properties_parse( a_props, key );
1033         sprintf( key, "%s.out=%d,%d,%d,%d,%f,%d,%d", name, x, y, w, h, result.item.mix, width, height );
1034         mlt_properties_parse( a_props, key );
1035
1036         ds = w * 2;
1037         ss = width * 2;
1038
1039         // Now we need to create a new destination image
1040         dest = mlt_pool_alloc( w * h * 2 );
1041
1042         // Assign to the new frame
1043         mlt_properties_set_data( b_props, "image", dest, w * h * 2, mlt_pool_release, NULL );
1044         mlt_properties_set_int( b_props, "width", w );
1045         mlt_properties_set_int( b_props, "height", h );
1046         mlt_properties_set_int( b_props, "format", format );
1047
1048         if ( y < 0 )
1049         {
1050                 dest += ( ds * -y );
1051                 h += y;
1052                 y = 0;
1053         }
1054
1055         if ( y + h > height )
1056                 h -= ( y + h - height );
1057
1058         if ( x < 0 )
1059         {
1060                 dest += -x * 2;
1061                 w += x;
1062                 x = 0;
1063         }
1064
1065         if ( w > 0 && h > 0 )
1066         {
1067                 // Copy the region of the image
1068                 p = image + y * ss + x * 2;
1069
1070                 while ( h -- )
1071                 {
1072                         memcpy( dest, p, w * 2 );
1073                         dest += ds;
1074                         p += ss;
1075                 }
1076         }
1077
1078         // Assign this position to the b frame
1079         mlt_frame_set_position( b_frame, frame_position );
1080         mlt_properties_set_int( b_props, "distort", 1 );
1081
1082         // Return the frame
1083         return b_frame;
1084 }
1085
1086 /** Get the image.
1087 */
1088
1089 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
1090 {
1091         // Get the b frame from the stack
1092         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
1093
1094         // Get the transition from the a frame
1095         mlt_transition this = mlt_frame_pop_service( a_frame );
1096
1097         // Get in and out
1098         double position = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( a_frame ) );
1099         int out = mlt_frame_pop_service_int( a_frame );
1100         int in = mlt_frame_pop_service_int( a_frame );
1101
1102         // Get the properties from the transition
1103         mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
1104
1105         // TODO: clean up always_active behaviour
1106         if ( mlt_properties_get_int( properties, "always_active" ) )
1107         {
1108                 mlt_events_block( properties, properties );
1109                 mlt_properties_set_int( properties, "in", in );
1110                 mlt_properties_set_int( properties, "out", out );
1111                 mlt_events_unblock( properties, properties );
1112         }
1113
1114         // This compositer is yuv422 only
1115         *format = mlt_image_yuv422;
1116
1117         if ( b_frame != NULL )
1118         {
1119                 // Get the properties of the a frame
1120                 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
1121
1122                 // Get the properties of the b frame
1123                 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
1124
1125                 // Structures for geometry
1126                 struct geometry_s result;
1127
1128                 // Calculate the position
1129                 double delta = delta_calculate( this, a_frame, position );
1130
1131                 // Get the image from the b frame
1132                 uint8_t *image_b = NULL;
1133                 int width_b = *width;
1134                 int height_b = *height;
1135
1136                 // Vars for alphas
1137                 uint8_t *alpha_a = NULL;
1138                 uint8_t *alpha_b = NULL;
1139
1140                 // Composites always need scaling... defaulting to lowest
1141                 const char *rescale = mlt_properties_get( a_props, "rescale.interp" );
1142                 if ( rescale == NULL || !strcmp( rescale, "none" ) )
1143                         rescale = "nearest";
1144                 mlt_properties_set( a_props, "rescale.interp", rescale );
1145                 mlt_properties_set( b_props, "rescale.interp", rescale );
1146
1147                 // Do the calculation
1148                 // NB: Locks needed here since the properties are being modified
1149                 mlt_service_lock( MLT_TRANSITION_SERVICE( this ) );
1150                 composite_calculate( this, &result, a_frame, position );
1151                 mlt_service_unlock( MLT_TRANSITION_SERVICE( this ) );
1152
1153                 // Since we are the consumer of the b_frame, we must pass along these
1154                 // consumer properties from the a_frame
1155                 mlt_properties_set_int( b_props, "consumer_deinterlace", mlt_properties_get_int( a_props, "consumer_deinterlace" ) || mlt_properties_get_int( properties, "deinterlace" ) );
1156                 mlt_properties_set( b_props, "consumer_deinterlace_method", mlt_properties_get( a_props, "consumer_deinterlace_method" ) );
1157                 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
1158
1159                 // TODO: Dangerous/temporary optimisation - if nothing to do, then do nothing
1160                 if ( mlt_properties_get_int( properties, "no_alpha" ) &&
1161                          result.item.x == 0 && result.item.y == 0 && result.item.w == *width && result.item.h == *height && result.item.mix == 100 )
1162                 {
1163                         mlt_frame_get_image( b_frame, image, format, width, height, 1 );
1164                         if ( !mlt_frame_is_test_card( a_frame ) )
1165                                 mlt_frame_replace_image( a_frame, *image, *format, *width, *height );
1166                         return 0;
1167                 }
1168
1169                 if ( a_frame == b_frame )
1170                 {
1171                         double aspect_ratio = mlt_frame_get_aspect_ratio( b_frame );
1172                         get_b_frame_image( this, b_frame, &image_b, &width_b, &height_b, &result );
1173                         alpha_b = mlt_frame_get_alpha_mask( b_frame );
1174                         mlt_properties_set_double( a_props, "aspect_ratio", aspect_ratio );
1175                 }
1176
1177                 // Get the image from the a frame
1178                 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
1179                 alpha_a = mlt_frame_get_alpha_mask( a_frame );
1180
1181                 // Optimisation - no compositing required
1182                 if ( result.item.mix == 0 || ( result.item.w == 0 && result.item.h == 0 ) )
1183                         return 0;
1184
1185                 // Need to keep the width/height of the a_frame on the b_frame for titling
1186                 if ( mlt_properties_get( a_props, "dest_width" ) == NULL )
1187                 {
1188                         mlt_properties_set_int( a_props, "dest_width", *width );
1189                         mlt_properties_set_int( a_props, "dest_height", *height );
1190                         mlt_properties_set_int( b_props, "dest_width", *width );
1191                         mlt_properties_set_int( b_props, "dest_height", *height );
1192                 }
1193                 else
1194                 {
1195                         mlt_properties_set_int( b_props, "dest_width", mlt_properties_get_int( a_props, "dest_width" ) );
1196                         mlt_properties_set_int( b_props, "dest_height", mlt_properties_get_int( a_props, "dest_height" ) );
1197                 }
1198
1199                 // Special case for titling...
1200                 if ( mlt_properties_get_int( properties, "titles" ) )
1201                 {
1202                         if ( mlt_properties_get( b_props, "rescale.interp" ) == NULL )
1203                                 mlt_properties_set( b_props, "rescale.interp", "hyper" );
1204                         width_b = mlt_properties_get_int( a_props, "dest_width" );
1205                         height_b = mlt_properties_get_int( a_props, "dest_height" );
1206                 }
1207
1208                 if ( *image != image_b && ( image_b != NULL || get_b_frame_image( this, b_frame, &image_b, &width_b, &height_b, &result ) == 0 ) )
1209                 {
1210                         uint8_t *dest = *image;
1211                         uint8_t *src = image_b;
1212                         int progressive =
1213                                         mlt_properties_get_int( a_props, "consumer_deinterlace" ) ||
1214                                         mlt_properties_get_int( properties, "progressive" );
1215                         int field;
1216
1217                         int32_t luma_softness = mlt_properties_get_double( properties, "softness" ) * ( 1 << 16 );
1218                         uint16_t *luma_bitmap = get_luma( this, properties, width_b, height_b );
1219                         char *operator = mlt_properties_get( properties, "operator" );
1220
1221                         alpha_b = alpha_b == NULL ? mlt_frame_get_alpha_mask( b_frame ) : alpha_b;
1222
1223                         composite_line_fn line_fn = composite_line_yuv;
1224
1225                         // Replacement and override
1226                         if ( operator != NULL )
1227                         {
1228                                 if ( !strcmp( operator, "or" ) )
1229                                         line_fn = composite_line_yuv_or;
1230                                 if ( !strcmp( operator, "and" ) )
1231                                         line_fn = composite_line_yuv_and;
1232                                 if ( !strcmp( operator, "xor" ) )
1233                                         line_fn = composite_line_yuv_xor;
1234                         }
1235
1236                         // Allow the user to completely obliterate the alpha channels from both frames
1237                         if ( mlt_properties_get( properties, "alpha_a" ) )
1238                                 memset( alpha_a, mlt_properties_get_int( properties, "alpha_a" ), *width * *height );
1239
1240                         if ( mlt_properties_get( properties, "alpha_b" ) )
1241                                 memset( alpha_b, mlt_properties_get_int( properties, "alpha_b" ), width_b * height_b );
1242
1243                         for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
1244                         {
1245                                 // Assume lower field (0) first
1246                                 double field_position = position + field * delta;
1247
1248                                 // Do the calculation if we need to
1249                                 // NB: Locks needed here since the properties are being modified
1250                                 mlt_service_lock( MLT_TRANSITION_SERVICE( this ) );
1251                                 composite_calculate( this, &result, a_frame, field_position );
1252                                 mlt_service_unlock( MLT_TRANSITION_SERVICE( this ) );
1253
1254                                 if ( mlt_properties_get_int( properties, "titles" ) )
1255                                 {
1256                                         result.item.w = rint( *width * ( result.item.w / result.nw ) );
1257                                         result.nw = result.item.w;
1258                                         result.item.h = rint( *height * ( result.item.h / result.nh ) );
1259                                         result.nh = *height;
1260                                         result.sw = width_b;
1261                                         result.sh = height_b;
1262                                 }
1263
1264                                 // Enforce cropping
1265                                 if ( mlt_properties_get( properties, "crop" ) )
1266                                 {
1267                                         if ( result.x_src == 0 )
1268                                                 width_b = width_b > result.item.w ? result.item.w : width_b;
1269                                         if ( result.y_src == 0 )
1270                                                 height_b = height_b > result.item.h ? result.item.h : height_b;
1271                                 }
1272                                 else
1273                                 {
1274                                         // Otherwise, align
1275                                         alignment_calculate( &result );
1276                                 }
1277
1278                                 // Composite the b_frame on the a_frame
1279                                 composite_yuv( dest, *width, *height, src, width_b, height_b, alpha_b, alpha_a, result, progressive ? -1 : field, luma_bitmap, luma_softness, line_fn );
1280                         }
1281                 }
1282         }
1283         else
1284         {
1285                 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
1286         }
1287
1288         return 0;
1289 }
1290
1291 /** Composition transition processing.
1292 */
1293
1294 static mlt_frame composite_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame )
1295 {
1296         // UGH - this is a TODO - find a more reliable means of obtaining in/out for the always_active case
1297         if ( mlt_properties_get_int(  MLT_TRANSITION_PROPERTIES( this ), "always_active" ) == 0 )
1298         {
1299                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( this ), "in" ) );
1300                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( this ), "out" ) );
1301                 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( a_frame ), position_calculate( this, mlt_frame_get_position( a_frame ) ) );
1302         }
1303         else
1304         {
1305                 mlt_properties props = mlt_properties_get_data( MLT_FRAME_PROPERTIES( b_frame ), "_producer", NULL );
1306                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( props, "in" ) );
1307                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( props, "out" ) );
1308                 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( a_frame ), mlt_properties_get_int( props, "_frame" ) - mlt_properties_get_int( props, "in" ) );
1309         }
1310
1311         mlt_frame_push_service( a_frame, this );
1312         mlt_frame_push_frame( a_frame, b_frame );
1313         mlt_frame_push_get_image( a_frame, transition_get_image );
1314         return a_frame;
1315 }
1316
1317 /** Constructor for the filter.
1318 */
1319
1320 mlt_transition transition_composite_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
1321 {
1322         mlt_transition this = calloc( sizeof( struct mlt_transition_s ), 1 );
1323         if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
1324         {
1325                 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
1326
1327                 this->process = composite_process;
1328
1329                 // Default starting motion and zoom
1330                 mlt_properties_set( properties, "start", arg != NULL ? arg : "0,0:100%x100%" );
1331
1332                 // Default factory
1333                 mlt_properties_set( properties, "factory", "fezzik" );
1334
1335                 // Use alignment (and hence alpha of b frame)
1336                 mlt_properties_set_int( properties, "aligned", 1 );
1337
1338                 // Inform apps and framework that this is a video only transition
1339                 mlt_properties_set_int( properties, "_transition_type", 1 );
1340         }
1341         return this;
1342 }