]> git.sesse.net Git - mlt/blob - src/modules/core/transition_composite.c
Refactor to use mlt_transition_get_length().
[mlt] / 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 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 duration
102         mlt_position length = mlt_transition_get_length( this );
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         }
160         
161         return geometry;
162 }
163
164 /** Adjust position according to scaled size and alignment properties.
165 */
166
167 static void alignment_calculate( struct geometry_s *geometry )
168 {
169         geometry->item.x += ( geometry->item.w - geometry->sw ) * geometry->halign / 2;
170         geometry->item.y += ( geometry->item.h - geometry->sh ) * geometry->valign / 2;
171 }
172
173 /** Calculate the position for this frame.
174 */
175
176 static int position_calculate( mlt_transition this, mlt_position position )
177 {
178         // Get the in and out position
179         mlt_position in = mlt_transition_get_in( this );
180
181         // Now do the calcs
182         return position - in;
183 }
184
185 /** Calculate the field delta for this frame - position between two frames.
186 */
187
188 static inline double delta_calculate( mlt_transition this, mlt_frame frame, mlt_position position )
189 {
190         // Get the in and out position
191         mlt_position in = mlt_transition_get_in( this );
192         mlt_position out = mlt_transition_get_out( this );
193         double length = out - in + 1;
194
195         // Now do the calcs
196         double x = ( double )( position - in ) / length;
197         double y = ( double )( position + 1 - in ) / length;
198
199         return length * ( y - x ) / 2.0;
200 }
201
202 static int get_value( mlt_properties properties, const char *preferred, const char *fallback )
203 {
204         int value = mlt_properties_get_int( properties, preferred );
205         if ( value == 0 )
206                 value = mlt_properties_get_int( properties, fallback );
207         return value;
208 }
209
210 /** A linear threshold determination function.
211 */
212
213 static inline int32_t linearstep( int32_t edge1, int32_t edge2, int32_t a )
214 {
215         if ( a < edge1 )
216                 return 0;
217
218         if ( a >= edge2 )
219                 return 0x10000;
220
221         return ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
222 }
223
224 /** A smoother, non-linear threshold determination function.
225 */
226
227 static inline int32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
228 {
229         if ( a < edge1 )
230                 return 0;
231
232         if ( a >= edge2 )
233                 return 0x10000;
234
235         a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
236
237         return ( ( ( a * a ) >> 16 )  * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
238 }
239
240 /** Load the luma map from PGM stream.
241 */
242
243 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
244 {
245         uint8_t *data = NULL;
246         while (1)
247         {
248                 char line[128];
249                 char comment[128];
250                 int i = 2;
251                 int maxval;
252                 int bpp;
253                 uint16_t *p;
254
255                 line[127] = '\0';
256
257                 // get the magic code
258                 if ( 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                 if ( line[0] != 'P' || line[1] != '5' )
267                         break;
268
269                 // skip white space and see if a new line must be fetched
270                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
271                 if ( ( line[i] == '\0' || line[i] == '#' ) && fgets( line, 127, f ) == NULL )
272                         break;
273
274                 // skip comments
275                 while ( sscanf( line, " #%s", comment ) > 0 )
276                         if ( fgets( line, 127, f ) == NULL )
277                                 break;
278
279                 // get the dimensions
280                 if ( line[0] == 'P' )
281                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
282                 else
283                         i = sscanf( line, "%d %d %d", width, height, &maxval );
284
285                 // get the height value, if not yet
286                 if ( i < 2 )
287                 {
288                         if ( fgets( line, 127, f ) == NULL )
289                                 break;
290
291                         // skip comments
292                         while ( sscanf( line, " #%s", comment ) > 0 )
293                                 if ( fgets( line, 127, f ) == NULL )
294                                         break;
295
296                         i = sscanf( line, "%d", height );
297                         if ( i == 0 )
298                                 break;
299                         else
300                                 i = 2;
301                 }
302
303                 // get the maximum gray value, if not yet
304                 if ( i < 3 )
305                 {
306                         if ( fgets( line, 127, f ) == NULL )
307                                 break;
308
309                         // skip comments
310                         while ( sscanf( line, " #%s", comment ) > 0 )
311                                 if ( fgets( line, 127, f ) == NULL )
312                                         break;
313
314                         i = sscanf( line, "%d", &maxval );
315                         if ( i == 0 )
316                                 break;
317                 }
318
319                 // determine if this is one or two bytes per pixel
320                 bpp = maxval > 255 ? 2 : 1;
321
322                 // allocate temporary storage for the raw data
323                 data = mlt_pool_alloc( *width * *height * bpp );
324                 if ( data == NULL )
325                         break;
326
327                 // read the raw data
328                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
329                         break;
330
331                 // allocate the luma bitmap
332                 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
333                 if ( *map == NULL )
334                         break;
335
336                 // proces the raw data into the luma bitmap
337                 for ( i = 0; i < *width * *height * bpp; i += bpp )
338                 {
339                         if ( bpp == 1 )
340                                 *p++ = data[ i ] << 8;
341                         else
342                                 *p++ = ( data[ i ] << 8 ) + data[ i + 1 ];
343                 }
344
345                 break;
346         }
347
348         if ( data != NULL )
349                 mlt_pool_release( data );
350 }
351
352 /** Generate a luma map from any YUV image.
353 */
354
355 static void luma_read_yuv422( uint8_t *image, uint16_t **map, int width, int height )
356 {
357         int i;
358         
359         // allocate the luma bitmap
360         uint16_t *p = *map = ( uint16_t* )mlt_pool_alloc( width * height * sizeof( uint16_t ) );
361         if ( *map == NULL )
362                 return;
363
364         // proces the image data into the luma bitmap
365         for ( i = 0; i < width * height * 2; i += 2 )
366                 *p++ = ( image[ i ] - 16 ) * 299; // 299 = 65535 / 219
367 }
368
369 static inline int calculate_mix( uint16_t *luma, int j, int softness, int weight, int alpha, uint32_t step )
370 {
371         return ( ( luma ? smoothstep( luma[ j ], luma[ j ] + softness, step ) : weight ) * alpha ) >> 8;
372 }
373
374 static inline uint8_t sample_mix( uint8_t dest, uint8_t src, int mix )
375 {
376         return ( src * mix + dest * ( ( 1 << 16 ) - mix ) ) >> 16;
377 }
378
379 /** Composite a source line over a destination line
380 */
381
382 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, uint32_t step )
383 {
384         register int j;
385         register int mix;
386
387         for ( j = 0; j < width; j ++ )
388         {
389                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++, step );
390                 *dest = sample_mix( *dest, *src++, mix );
391                 dest++;
392                 *dest = sample_mix( *dest, *src++, mix );
393                 dest++;
394                 *alpha_a = ( mix >> 8 ) | *alpha_a;
395                 alpha_a ++;
396         }
397 }
398
399 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 )
400 {
401         register int j;
402         register int mix;
403
404         for ( j = 0; j < width; j ++ )
405         {
406                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++ | *alpha_a, step );
407                 *dest = sample_mix( *dest, *src++, mix );
408                 dest++;
409                 *dest = sample_mix( *dest, *src++, mix );
410                 dest++;
411                 *alpha_a ++ = mix >> 8;
412         }
413 }
414
415 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  )
416 {
417         register int j;
418         register int mix;
419
420         for ( j = 0; j < width; j ++ )
421         {
422                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++ & *alpha_a, step );
423                 *dest = sample_mix( *dest, *src++, mix );
424                 dest++;
425                 *dest = sample_mix( *dest, *src++, mix );
426                 dest++;
427                 *alpha_a ++ = mix >> 8;
428         }
429 }
430
431 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 )
432 {
433         register int j;
434         register int mix;
435
436         for ( j = 0; j < width; j ++ )
437         {
438                 mix = calculate_mix( luma, j, soft, weight, *alpha_b ++ ^ *alpha_a, step );
439                 *dest = sample_mix( *dest, *src++, mix );
440                 dest++;
441                 *dest = sample_mix( *dest, *src++, mix );
442                 dest++;
443                 *alpha_a ++ = mix >> 8;
444         }
445 }
446
447 /** Composite function.
448 */
449
450 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 )
451 {
452         int ret = 0;
453         int i;
454         int x_src = -geometry.x_src, y_src = -geometry.y_src;
455         int uneven_x_src = ( x_src % 2 );
456         int step = ( field > -1 ) ? 2 : 1;
457         int bpp = 2;
458         int stride_src = geometry.sw * bpp;
459         int stride_dest = width_dest * bpp;
460         int i_softness = ( 1 << 16 ) * softness;
461         int weight = ( ( 1 << 16 ) - 1 ) * geometry.item.mix / 100;
462         uint32_t luma_step = ( ( 1 << 16 ) - 1 ) * geometry.item.mix / 100 * ( 1.0 + softness );
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, i_softness, luma_step );
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         *width -= *width % 2; // coerce to even width for yuv422
855         *height = rint( geometry->sh * *height / geometry->nh );
856 // fprintf(stderr, "%s: scaled %dx%d norm %dx%d resize %dx%d\n", __FILE__,
857 // geometry->sw, geometry->sh, geometry->nw, geometry->nh, *width, *height);
858
859         ret = mlt_frame_get_image( b_frame, image, &format, width, height, 1 );
860
861         // composite_yuv uses geometry->sw to determine source stride, which
862         // should equal the image width if not using crop property.
863         if ( !mlt_properties_get( properties, "crop" ) )
864                 geometry->sw = *width;
865
866         // Set the frame back
867         mlt_properties_set_int( b_props, "resize_alpha", resize_alpha );
868
869         return ret && image != NULL;
870 }
871
872 static void crop_calculate( mlt_transition this, mlt_properties properties, struct geometry_s *result, double position )
873 {
874         // Initialize panning info
875         result->x_src = 0;
876         result->y_src = 0;
877         if ( mlt_properties_get( properties, "crop" ) )
878         {
879                 mlt_geometry crop = mlt_properties_get_data( properties, "crop_geometry", NULL );
880                 if ( !crop )
881                 {
882                         crop = mlt_geometry_init();
883                         mlt_position length = mlt_transition_get_length( this );
884                         double cycle = mlt_properties_get_double( properties, "cycle" );
885
886                         // Allow a geometry repeat cycle
887                         if ( cycle >= 1 )
888                                 length = cycle;
889                         else if ( cycle > 0 )
890                                 length *= cycle;
891                         mlt_geometry_parse( crop, mlt_properties_get( properties, "crop" ), length, result->sw, result->sh );
892                         mlt_properties_set_data( properties, "crop_geometry", crop, 0, (mlt_destructor)mlt_geometry_close, NULL );
893                 }
894
895                 // Repeat processing
896                 int length = mlt_geometry_get_length( crop );
897                 int mirror_off = mlt_properties_get_int( properties, "mirror_off" );
898                 int repeat_off = mlt_properties_get_int( properties, "repeat_off" );
899                 if ( !repeat_off && position >= length && length != 0 )
900                 {
901                         int section = position / length;
902                         position -= section * length;
903                         if ( !mirror_off && section % 2 == 1 )
904                                 position = length - position;
905                 }
906
907                 // Compute the pan
908                 struct mlt_geometry_item_s crop_item;
909                 mlt_geometry_fetch( crop, &crop_item, position );
910                 result->x_src = rint( crop_item.x );
911                 result->y_src = rint( crop_item.y );
912         }
913 }
914
915 static mlt_geometry composite_calculate( mlt_transition this, struct geometry_s *result, mlt_frame a_frame, double position )
916 {
917         // Get the properties from the transition
918         mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
919
920         // Get the properties from the frame
921         mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
922         
923         // Structures for geometry
924         mlt_geometry start = mlt_properties_get_data( properties, "geometries", NULL );
925
926         // Obtain the normalised width and height from the a_frame
927         int normalised_width = mlt_properties_get_int( a_props, "normalised_width" );
928         int normalised_height = mlt_properties_get_int( a_props, "normalised_height" );
929
930         char *name = mlt_properties_get( properties, "_unique_id" );
931         char key[ 256 ];
932
933         sprintf( key, "%s.in", name );
934         if ( mlt_properties_get( a_props, key ) )
935         {
936                 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 );
937         }
938         else
939         {
940                 // Now parse the geometries
941                 if ( start == NULL )
942                 {
943                         // Parse the transitions properties
944                         start = transition_parse_keys( this, normalised_width, normalised_height );
945
946                         // Assign to properties to ensure we get destroyed
947                         mlt_properties_set_data( properties, "geometries", start, 0, ( mlt_destructor )mlt_geometry_close, NULL );
948                 }
949                 else
950                 {
951                         mlt_position length = mlt_transition_get_length( this );
952                         double cycle = mlt_properties_get_double( properties, "cycle" );
953                         if ( cycle > 1 )
954                                 length = cycle;
955                         else if ( cycle > 0 )
956                                 length *= cycle;
957                         mlt_geometry_refresh( start, mlt_properties_get( properties, "geometry" ), length, normalised_width, normalised_height );
958                 }
959
960                 // Do the calculation
961                 geometry_calculate( this, result, position );
962
963                 // Assign normalised info
964                 result->nw = normalised_width;
965                 result->nh = normalised_height;
966         }
967
968         // Now parse the alignment
969         result->halign = alignment_parse( mlt_properties_get( properties, "halign" ) );
970         result->valign = alignment_parse( mlt_properties_get( properties, "valign" ) );
971
972         crop_calculate( this, properties, result, position );
973
974         return start;
975 }
976
977 mlt_frame composite_copy_region( mlt_transition this, mlt_frame a_frame, mlt_position frame_position )
978 {
979         // Create a frame to return
980         mlt_frame b_frame = mlt_frame_init( MLT_TRANSITION_SERVICE( this ) );
981
982         // Get the properties of the a frame
983         mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
984
985         // Get the properties of the b frame
986         mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
987
988         // Get the position
989         int position = position_calculate( this, frame_position );
990
991         // Get the unique id of the transition
992         char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( this ), "_unique_id" );
993         char key[ 256 ];
994
995         // Destination image
996         uint8_t *dest = NULL;
997
998         // Get the image and dimensions
999         uint8_t *image = mlt_properties_get_data( a_props, "image", NULL );
1000         int width = mlt_properties_get_int( a_props, "width" );
1001         int height = mlt_properties_get_int( a_props, "height" );
1002         int format = mlt_properties_get_int( a_props, "format" );
1003
1004         // Pointers for copy operation
1005         uint8_t *p;
1006
1007         // Coordinates
1008         int w = 0;
1009         int h = 0;
1010         int x = 0;
1011         int y = 0;
1012
1013         int ss = 0;
1014         int ds = 0;
1015
1016         // Will need to know region to copy
1017         struct geometry_s result;
1018
1019         // Calculate the region now
1020         composite_calculate( this, &result, a_frame, position );
1021
1022         // Need to scale down to actual dimensions
1023         x = rint( result.item.x * width / result.nw );
1024         y = rint( result.item.y * height / result.nh );
1025         w = rint( result.item.w * width / result.nw );
1026         h = rint( result.item.h * height / result.nh );
1027
1028         if ( x % 2 )
1029         {
1030                 x --;
1031                 w ++;
1032         }
1033
1034         // Store the key
1035         sprintf( key, "%s.in=%d,%d,%d,%d,%f,%d,%d", name, x, y, w, h, result.item.mix, width, height );
1036         mlt_properties_parse( a_props, key );
1037         sprintf( key, "%s.out=%d,%d,%d,%d,%f,%d,%d", name, x, y, w, h, result.item.mix, width, height );
1038         mlt_properties_parse( a_props, key );
1039
1040         ds = w * 2;
1041         ss = width * 2;
1042
1043         // Now we need to create a new destination image
1044         dest = mlt_pool_alloc( w * h * 2 );
1045
1046         // Assign to the new frame
1047         mlt_frame_set_image( b_frame, dest, w * h * 2, mlt_pool_release );
1048         mlt_properties_set_int( b_props, "width", w );
1049         mlt_properties_set_int( b_props, "height", h );
1050         mlt_properties_set_int( b_props, "format", format );
1051
1052         if ( y < 0 )
1053         {
1054                 dest += ( ds * -y );
1055                 h += y;
1056                 y = 0;
1057         }
1058
1059         if ( y + h > height )
1060                 h -= ( y + h - height );
1061
1062         if ( x < 0 )
1063         {
1064                 dest += -x * 2;
1065                 w += x;
1066                 x = 0;
1067         }
1068
1069         if ( w > 0 && h > 0 )
1070         {
1071                 // Copy the region of the image
1072                 p = image + y * ss + x * 2;
1073
1074                 while ( h -- )
1075                 {
1076                         memcpy( dest, p, w * 2 );
1077                         dest += ds;
1078                         p += ss;
1079                 }
1080         }
1081
1082         // Assign this position to the b frame
1083         mlt_frame_set_position( b_frame, frame_position );
1084         mlt_properties_set_int( b_props, "distort", 1 );
1085
1086         // Return the frame
1087         return b_frame;
1088 }
1089
1090 /** Get the image.
1091 */
1092
1093 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
1094 {
1095         // Get the b frame from the stack
1096         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
1097
1098         // Get the transition from the a frame
1099         mlt_transition this = mlt_frame_pop_service( a_frame );
1100
1101         // Get in and out
1102         double position = mlt_deque_pop_back_double( MLT_FRAME_IMAGE_STACK( a_frame ) );
1103         int out = mlt_frame_pop_service_int( a_frame );
1104         int in = mlt_frame_pop_service_int( a_frame );
1105
1106         // Get the properties from the transition
1107         mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
1108
1109         // TODO: clean up always_active behaviour
1110         if ( mlt_properties_get_int( properties, "always_active" ) )
1111         {
1112                 mlt_events_block( properties, properties );
1113                 mlt_properties_set_int( properties, "in", in );
1114                 mlt_properties_set_int( properties, "out", out );
1115                 mlt_events_unblock( properties, properties );
1116         }
1117
1118         // This compositer is yuv422 only
1119         *format = mlt_image_yuv422;
1120
1121         if ( b_frame != NULL )
1122         {
1123                 // Get the properties of the a frame
1124                 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
1125
1126                 // Get the properties of the b frame
1127                 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
1128
1129                 // Structures for geometry
1130                 struct geometry_s result;
1131
1132                 // Calculate the position
1133                 double delta = delta_calculate( this, a_frame, position );
1134
1135                 // Get the image from the b frame
1136                 uint8_t *image_b = NULL;
1137                 int width_b = *width;
1138                 int height_b = *height;
1139         
1140                 // Vars for alphas
1141                 uint8_t *alpha_a = NULL;
1142                 uint8_t *alpha_b = NULL;
1143
1144                 // Composites always need scaling... defaulting to lowest
1145                 const char *rescale = mlt_properties_get( a_props, "rescale.interp" );
1146                 if ( rescale == NULL || !strcmp( rescale, "none" ) )
1147                         rescale = "nearest";
1148                 mlt_properties_set( a_props, "rescale.interp", rescale );
1149                 mlt_properties_set( b_props, "rescale.interp", rescale );
1150
1151                 // Do the calculation
1152                 // NB: Locks needed here since the properties are being modified
1153                 int invert = mlt_properties_get_int( properties, "invert" );
1154                 mlt_service_lock( MLT_TRANSITION_SERVICE( this ) );
1155                 composite_calculate( this, &result, invert ? b_frame : a_frame, position );
1156                 mlt_service_unlock( MLT_TRANSITION_SERVICE( this ) );
1157
1158                 // Since we are the consumer of the b_frame, we must pass along these
1159                 // consumer properties from the a_frame
1160                 mlt_properties_set_int( b_props, "consumer_deinterlace", mlt_properties_get_int( a_props, "consumer_deinterlace" ) || mlt_properties_get_int( properties, "deinterlace" ) );
1161                 mlt_properties_set( b_props, "consumer_deinterlace_method", mlt_properties_get( a_props, "consumer_deinterlace_method" ) );
1162                 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
1163
1164                 // TODO: Dangerous/temporary optimisation - if nothing to do, then do nothing
1165                 if ( mlt_properties_get_int( properties, "no_alpha" ) && 
1166                          result.item.x == 0 && result.item.y == 0 && result.item.w == *width && result.item.h == *height && result.item.mix == 100 )
1167                 {
1168                         mlt_frame_get_image( b_frame, image, format, width, height, 1 );
1169                         if ( !mlt_frame_is_test_card( a_frame ) )
1170                                 mlt_frame_replace_image( a_frame, *image, *format, *width, *height );
1171                         return 0;
1172                 }
1173
1174                 if ( a_frame == b_frame )
1175                 {
1176                         double aspect_ratio = mlt_frame_get_aspect_ratio( b_frame );
1177                         get_b_frame_image( this, b_frame, &image_b, &width_b, &height_b, &result );
1178                         alpha_b = mlt_frame_get_alpha_mask( b_frame );
1179                         mlt_properties_set_double( a_props, "aspect_ratio", aspect_ratio );
1180                 }
1181
1182                 // Get the image from the a frame
1183                 mlt_frame_get_image( a_frame, invert ? &image_b : image, format, width, height, 1 );
1184                 alpha_a = mlt_frame_get_alpha_mask( a_frame );
1185
1186                 // Optimisation - no compositing required
1187                 if ( result.item.mix == 0 || ( result.item.w == 0 && result.item.h == 0 ) )
1188                         return 0;
1189
1190                 // Need to keep the width/height of the a_frame on the b_frame for titling
1191                 if ( mlt_properties_get( a_props, "dest_width" ) == NULL )
1192                 {
1193                         mlt_properties_set_int( a_props, "dest_width", *width );
1194                         mlt_properties_set_int( a_props, "dest_height", *height );
1195                         mlt_properties_set_int( b_props, "dest_width", *width );
1196                         mlt_properties_set_int( b_props, "dest_height", *height );
1197                 }
1198                 else
1199                 {
1200                         mlt_properties_set_int( b_props, "dest_width", mlt_properties_get_int( a_props, "dest_width" ) );
1201                         mlt_properties_set_int( b_props, "dest_height", mlt_properties_get_int( a_props, "dest_height" ) );
1202                 }
1203
1204                 // Special case for titling...
1205                 if ( mlt_properties_get_int( properties, "titles" ) )
1206                 {
1207                         if ( mlt_properties_get( b_props, "rescale.interp" ) == NULL )
1208                                 mlt_properties_set( b_props, "rescale.interp", "hyper" );
1209                         width_b = mlt_properties_get_int( a_props, "dest_width" );
1210                         height_b = mlt_properties_get_int( a_props, "dest_height" );
1211                 }
1212
1213                 if ( *image != image_b && ( ( invert ? 0 : image_b ) || get_b_frame_image( this, b_frame, invert ? image : &image_b, &width_b, &height_b, &result ) == 0 ) )
1214                 {
1215                         uint8_t *dest = *image;
1216                         uint8_t *src = image_b;
1217                         int progressive = 
1218                                         mlt_properties_get_int( a_props, "consumer_deinterlace" ) ||
1219                                         mlt_properties_get_int( properties, "progressive" );
1220                         int field;
1221                         
1222                         double luma_softness = mlt_properties_get_double( properties, "softness" );
1223                         mlt_service_lock( MLT_TRANSITION_SERVICE( this ) );
1224                         uint16_t *luma_bitmap = get_luma( this, properties, width_b, height_b );
1225                         mlt_service_unlock( MLT_TRANSITION_SERVICE( this ) );
1226                         char *operator = mlt_properties_get( properties, "operator" );
1227
1228                         alpha_b = alpha_b == NULL ? mlt_frame_get_alpha_mask( b_frame ) : alpha_b;
1229
1230                         composite_line_fn line_fn = composite_line_yuv;
1231
1232                         // Replacement and override
1233                         if ( operator != NULL )
1234                         {
1235                                 if ( !strcmp( operator, "or" ) )
1236                                         line_fn = composite_line_yuv_or;
1237                                 if ( !strcmp( operator, "and" ) )
1238                                         line_fn = composite_line_yuv_and;
1239                                 if ( !strcmp( operator, "xor" ) )
1240                                         line_fn = composite_line_yuv_xor;
1241                         }
1242
1243                         // Allow the user to completely obliterate the alpha channels from both frames
1244                         if ( mlt_properties_get( properties, "alpha_a" ) )
1245                                 memset( alpha_a, mlt_properties_get_int( properties, "alpha_a" ), *width * *height );
1246
1247                         if ( mlt_properties_get( properties, "alpha_b" ) )
1248                                 memset( alpha_b, mlt_properties_get_int( properties, "alpha_b" ), width_b * height_b );
1249
1250                         for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
1251                         {
1252                                 // Assume lower field (0) first
1253                                 double field_position = position + field * delta;
1254                                 
1255                                 // Do the calculation if we need to
1256                                 // NB: Locks needed here since the properties are being modified
1257                                 mlt_service_lock( MLT_TRANSITION_SERVICE( this ) );
1258                                 composite_calculate( this, &result, invert ? b_frame : a_frame, field_position );
1259                                 mlt_service_unlock( MLT_TRANSITION_SERVICE( this ) );
1260
1261                                 if ( mlt_properties_get_int( properties, "titles" ) )
1262                                 {
1263                                         result.item.w = rint( *width * ( result.item.w / result.nw ) );
1264                                         result.nw = result.item.w;
1265                                         result.item.h = rint( *height * ( result.item.h / result.nh ) );
1266                                         result.nh = *height;
1267                                         result.sw = width_b;
1268                                         result.sh = height_b;
1269                                 }
1270
1271                                 // Enforce cropping
1272                                 if ( mlt_properties_get( properties, "crop" ) )
1273                                 {
1274                                         if ( result.x_src == 0 )
1275                                                 width_b = width_b > result.item.w ? result.item.w : width_b;
1276                                         if ( result.y_src == 0 )
1277                                                 height_b = height_b > result.item.h ? result.item.h : height_b;
1278                                 }
1279                                 else
1280                                 {
1281                                         // Otherwise, align
1282                                         alignment_calculate( &result );
1283                                 }
1284
1285                                 // Composite the b_frame on the a_frame
1286                                 if ( invert )
1287                                         composite_yuv( dest, width_b, height_b, src, *width, *height, alpha_a, alpha_b, result, progressive ? -1 : field, luma_bitmap, luma_softness, line_fn );
1288                                 else
1289                                         composite_yuv( dest, *width, *height, src, width_b, height_b, alpha_b, alpha_a, result, progressive ? -1 : field, luma_bitmap, luma_softness, line_fn );
1290                         }
1291                 }
1292         }
1293         else
1294         {
1295                 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
1296         }
1297
1298         return 0;
1299 }
1300
1301 /** Composition transition processing.
1302 */
1303
1304 static mlt_frame composite_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame )
1305 {
1306         // UGH - this is a TODO - find a more reliable means of obtaining in/out for the always_active case
1307         if ( mlt_properties_get_int(  MLT_TRANSITION_PROPERTIES( this ), "always_active" ) == 0 )
1308         {
1309                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( this ), "in" ) );
1310                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( MLT_TRANSITION_PROPERTIES( this ), "out" ) );
1311                 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( a_frame ), position_calculate( this, mlt_frame_get_position( a_frame ) ) );
1312         }
1313         else
1314         {
1315                 mlt_properties props = mlt_properties_get_data( MLT_FRAME_PROPERTIES( b_frame ), "_producer", NULL );
1316                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( props, "in" ) );
1317                 mlt_frame_push_service_int( a_frame, mlt_properties_get_int( props, "out" ) );
1318                 mlt_deque_push_back_double( MLT_FRAME_IMAGE_STACK( a_frame ), mlt_properties_get_int( props, "_frame" ) - mlt_properties_get_int( props, "in" ) );
1319         }
1320         
1321         mlt_frame_push_service( a_frame, this );
1322         mlt_frame_push_frame( a_frame, b_frame );
1323         mlt_frame_push_get_image( a_frame, transition_get_image );
1324         return a_frame;
1325 }
1326
1327 /** Constructor for the filter.
1328 */
1329
1330 mlt_transition transition_composite_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
1331 {
1332         mlt_transition this = calloc( sizeof( struct mlt_transition_s ), 1 );
1333         if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
1334         {
1335                 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
1336                 
1337                 this->process = composite_process;
1338                 
1339                 // Default starting motion and zoom
1340                 mlt_properties_set( properties, "start", arg != NULL ? arg : "0,0:100%x100%" );
1341                 
1342                 // Default factory
1343                 mlt_properties_set( properties, "factory", mlt_environment( "MLT_PRODUCER" ) );
1344
1345                 // Use alignment (and hence alpha of b frame)
1346                 mlt_properties_set_int( properties, "aligned", 1 );
1347
1348                 // Default to progressive rendering
1349                 mlt_properties_set_int( properties, "progressive", 1 );
1350                 
1351                 // Inform apps and framework that this is a video only transition
1352                 mlt_properties_set_int( properties, "_transition_type", 1 );
1353         }
1354         return this;
1355 }