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>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 #include "transition_composite.h"
22 #include <framework/mlt.h>
30 typedef void ( *composite_line_fn )( uint8_t *dest, uint8_t *src, int width_src, uint8_t *alpha, int weight, uint16_t *luma, int softness );
32 /* mmx function declarations */
34 void composite_line_yuv_mmx( uint8_t *dest, uint8_t *src, int width_src, uint8_t *alpha, int weight, uint16_t *luma, int softness );
35 int composite_have_mmx( void );
43 struct mlt_geometry_item_s item;
44 int nw; // normalised width
45 int nh; // normalised height
46 int sw; // scaled width, not including consumer scale based upon w/nw
47 int sh; // scaled height, not including consumer scale based upon h/nh
48 int halign; // horizontal alignment: 0=left, 1=center, 2=right
49 int valign; // vertical alignment: 0=top, 1=middle, 2=bottom
52 /** Parse the alignment properties into the geometry.
55 static int alignment_parse( char* align )
60 else if ( isdigit( align[ 0 ] ) )
62 else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
64 else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
70 /** Calculate real geometry.
73 static void geometry_calculate( mlt_transition this, struct geometry_s *output, float position )
75 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
76 mlt_geometry geometry = mlt_properties_get_data( properties, "geometries", NULL );
77 int length = mlt_geometry_get_length( geometry );
80 if ( position >= length && length != 0 )
82 int section = position / length;
83 position -= section * length;
84 if ( section % 2 == 1 )
85 position = length - position;
88 // Fetch the key for the position
89 mlt_geometry_fetch( geometry, &output->item, position );
92 static mlt_geometry transition_parse_keys( mlt_transition this, int normalised_width, int normalised_height )
94 // Loop variable for property interrogation
97 // Get the properties of the transition
98 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
100 // Create an empty geometries object
101 mlt_geometry geometry = mlt_geometry_init( );
103 // Get the in and out position
104 mlt_position in = mlt_transition_get_in( this );
105 mlt_position out = mlt_transition_get_out( this );
107 // Get the new style geometry string
108 char *property = mlt_properties_get( properties, "geometry" );
110 // Parse the geometry if we have one
111 mlt_geometry_parse( geometry, property, out - in + 1, normalised_width, normalised_height );
113 // Check if we're using the old style geometry
114 if ( property == NULL )
116 // DEPRECATED: Multiple keys for geometry information is inefficient and too rigid for
117 // practical use - while deprecated, it has been slightly extended too - keys can now
118 // be specified out of order, and can be blanked or NULL to simulate removal
120 // Structure to use for parsing and inserting
121 struct mlt_geometry_item_s item;
123 // Parse the start property
125 if ( mlt_geometry_parse_item( geometry, &item, mlt_properties_get( properties, "start" ) ) == 0 )
126 mlt_geometry_insert( geometry, &item );
128 // Parse the keys in between
129 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
131 // Get the name of the property
132 char *name = mlt_properties_get_name( properties, i );
134 // Check that it's valid
135 if ( !strncmp( name, "key[", 4 ) )
137 // Get the value of the property
138 char *value = mlt_properties_get_value( properties, i );
140 // Determine the frame number
141 item.frame = atoi( name + 4 );
143 // Parse and add to the list
144 if ( mlt_geometry_parse_item( geometry, &item, value ) == 0 )
145 mlt_geometry_insert( geometry, &item );
147 fprintf( stderr, "Invalid Key - skipping %s = %s\n", name, value );
153 if ( mlt_geometry_parse_item( geometry, &item, mlt_properties_get( properties, "end" ) ) == 0 )
154 mlt_geometry_insert( geometry, &item );
160 /** Adjust position according to scaled size and alignment properties.
163 static void alignment_calculate( struct geometry_s *geometry )
165 geometry->item.x += ( geometry->item.w - geometry->sw ) * geometry->halign / 2;
166 geometry->item.y += ( geometry->item.h - geometry->sh ) * geometry->valign / 2;
169 /** Calculate the position for this frame.
172 static int position_calculate( mlt_transition this, mlt_position position )
174 // Get the in and out position
175 mlt_position in = mlt_transition_get_in( this );
178 return position - in;
181 /** Calculate the field delta for this frame - position between two frames.
184 static inline float delta_calculate( mlt_transition this, mlt_frame frame )
186 // Get the in and out position
187 mlt_position in = mlt_transition_get_in( this );
188 mlt_position out = mlt_transition_get_out( this );
189 float length = out - in + 1;
191 // Get the position of the frame
192 char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( this ), "_unique_id" );
193 mlt_position position = mlt_properties_get_position( MLT_FRAME_PROPERTIES( frame ), name );
196 float x = ( float )( position - in ) / length;
197 float y = ( float )( position + 1 - in ) / length;
199 return length * ( y - x ) / 2.0;
202 static int get_value( mlt_properties properties, char *preferred, char *fallback )
204 int value = mlt_properties_get_int( properties, preferred );
206 value = mlt_properties_get_int( properties, fallback );
210 /** A linear threshold determination function.
213 static inline int32_t linearstep( int32_t edge1, int32_t edge2, int32_t a )
221 return ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
224 /** A smoother, non-linear threshold determination function.
227 static inline int32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
235 a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
237 return ( ( ( a * a ) >> 16 ) * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
240 /** Load the luma map from PGM stream.
243 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
245 uint8_t *data = NULL;
257 // get the magic code
258 if ( fgets( line, 127, f ) == NULL )
262 while ( sscanf( line, " #%s", comment ) > 0 )
263 if ( fgets( line, 127, f ) == NULL )
266 if ( line[0] != 'P' || line[1] != '5' )
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 )
275 while ( sscanf( line, " #%s", comment ) > 0 )
276 if ( fgets( line, 127, f ) == NULL )
279 // get the dimensions
280 if ( line[0] == 'P' )
281 i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
283 i = sscanf( line, "%d %d %d", width, height, &maxval );
285 // get the height value, if not yet
288 if ( fgets( line, 127, f ) == NULL )
292 while ( sscanf( line, " #%s", comment ) > 0 )
293 if ( fgets( line, 127, f ) == NULL )
296 i = sscanf( line, "%d", height );
303 // get the maximum gray value, if not yet
306 if ( fgets( line, 127, f ) == NULL )
310 while ( sscanf( line, " #%s", comment ) > 0 )
311 if ( fgets( line, 127, f ) == NULL )
314 i = sscanf( line, "%d", &maxval );
319 // determine if this is one or two bytes per pixel
320 bpp = maxval > 255 ? 2 : 1;
322 // allocate temporary storage for the raw data
323 data = mlt_pool_alloc( *width * *height * bpp );
328 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
331 // allocate the luma bitmap
332 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
336 // proces the raw data into the luma bitmap
337 for ( i = 0; i < *width * *height * bpp; i += bpp )
340 *p++ = data[ i ] << 8;
342 *p++ = ( data[ i ] << 8 ) + data[ i + 1 ];
349 mlt_pool_release( data );
352 /** Generate a luma map from any YUV image.
355 static void luma_read_yuv422( uint8_t *image, uint16_t **map, int width, int height )
359 // allocate the luma bitmap
360 uint16_t *p = *map = ( uint16_t* )mlt_pool_alloc( width * height * sizeof( uint16_t ) );
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
370 /** Composite a source line over a destination line
374 void composite_line_yuv( uint8_t *dest, uint8_t *src, int width_src, uint8_t *alpha, int weight, uint16_t *luma, int softness )
379 for ( j = 0; j < width_src; j ++ )
381 a = ( alpha == NULL ) ? 255 : *alpha ++;
382 mix = ( luma == NULL ) ? weight : linearstep( luma[ j ], luma[ j ] + softness, weight );
383 mix = ( mix * ( a + 1 ) ) >> 8;
384 *dest = ( *src++ * mix + *dest * ( ( 1 << 16 ) - mix ) ) >> 16;
386 *dest = ( *src++ * mix + *dest * ( ( 1 << 16 ) - mix ) ) >> 16;
391 /** Composite function.
394 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 *p_alpha, struct geometry_s geometry, int field, uint16_t *p_luma, int32_t softness, composite_line_fn line_fn )
398 int x_src = 0, y_src = 0;
399 int32_t weight = ( 1 << 16 ) * ( geometry.item.mix / 100 );
400 int step = ( field > -1 ) ? 2 : 1;
402 int stride_src = width_src * bpp;
403 int stride_dest = width_dest * bpp;
405 // Adjust to consumer scale
406 int x = rint( 0.5 + geometry.item.x * width_dest / geometry.nw );
407 int y = rint( 0.5 + geometry.item.y * height_dest / geometry.nh );
408 int x_uneven = x & 1;
410 // optimization points - no work to do
411 if ( width_src <= 0 || height_src <= 0 )
414 if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
417 // crop overlay off the left edge of frame
425 // crop overlay beyond right edge of frame
426 if ( x + width_src > width_dest )
427 width_src = width_dest - x;
429 // crop overlay off the top edge of the frame
437 // crop overlay below bottom edge of frame
438 if ( y + height_src > height_dest )
439 height_src = height_dest - y;
441 // offset pointer into overlay buffer based on cropping
442 p_src += x_src * bpp + y_src * stride_src;
444 // offset pointer into frame buffer based upon positive coordinates only!
445 p_dest += ( x < 0 ? 0 : x ) * bpp + ( y < 0 ? 0 : y ) * stride_dest;
447 // offset pointer into alpha channel based upon cropping
449 p_alpha += x_src + y_src * stride_src / bpp;
451 // offset pointer into luma channel based upon cropping
453 p_luma += x_src + y_src * stride_src / bpp;
455 // Assuming lower field first
456 // Special care is taken to make sure the b_frame is aligned to the correct field.
457 // field 0 = lower field and y should be odd (y is 0-based).
458 // field 1 = upper field and y should be even.
459 if ( ( field > -1 ) && ( y % 2 == field ) )
461 //fprintf( stderr, "field %d y %d\n", field, y );
462 if ( ( field == 1 && y < height_dest - 1 ) || ( field == 0 && y == 0 ) )
463 p_dest += stride_dest;
465 p_dest -= stride_dest;
468 // On the second field, use the other lines from b_frame
473 p_alpha += stride_src / bpp;
479 int alpha_stride = stride_src / bpp;
481 // Make sure than x and w are even
488 // now do the compositing only to cropped extents
489 if ( line_fn != NULL )
491 for ( i = 0; i < height_src; i += step )
493 line_fn( p_dest, p_src, width_src, p_alpha, weight, p_luma, softness );
496 p_dest += stride_dest;
498 p_alpha += alpha_stride;
500 p_luma += alpha_stride;
505 for ( i = 0; i < height_src; i += step )
507 composite_line_yuv( p_dest, p_src, width_src, p_alpha, weight, p_luma, softness );
510 p_dest += stride_dest;
512 p_alpha += alpha_stride;
514 p_luma += alpha_stride;
522 /** Scale 16bit greyscale luma map using nearest neighbor.
526 scale_luma ( uint16_t *dest_buf, int dest_width, int dest_height, const uint16_t *src_buf, int src_width, int src_height )
529 register int x_step = ( src_width << 16 ) / dest_width;
530 register int y_step = ( src_height << 16 ) / dest_height;
531 register int x, y = 0;
533 for ( i = 0; i < dest_height; i++ )
535 const uint16_t *src = src_buf + ( y >> 16 ) * src_width;
538 for ( j = 0; j < dest_width; j++ )
540 *dest_buf++ = src[ x >> 16 ];
547 static uint16_t* get_luma( mlt_properties properties, int width, int height )
549 // The cached luma map information
550 int luma_width = mlt_properties_get_int( properties, "_luma.width" );
551 int luma_height = mlt_properties_get_int( properties, "_luma.height" );
552 uint16_t *luma_bitmap = mlt_properties_get_data( properties, "_luma.bitmap", NULL );
554 // If the filename property changed, reload the map
555 char *resource = mlt_properties_get( properties, "luma" );
557 if ( resource != NULL && ( luma_bitmap == NULL || luma_width != width || luma_height != height ) )
559 uint16_t *orig_bitmap = mlt_properties_get_data( properties, "_luma.orig_bitmap", NULL );
560 luma_width = mlt_properties_get_int( properties, "_luma.orig_width" );
561 luma_height = mlt_properties_get_int( properties, "_luma.orig_height" );
563 // Load the original luma once
564 if ( orig_bitmap == NULL )
566 char *extension = extension = strrchr( resource, '.' );
568 // See if it is a PGM
569 if ( extension != NULL && strcmp( extension, ".pgm" ) == 0 )
572 FILE *f = fopen( resource, "r" );
576 luma_read_pgm( f, &orig_bitmap, &luma_width, &luma_height );
579 // Remember the original size for subsequent scaling
580 mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
581 mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
582 mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
587 // Get the factory producer service
588 char *factory = mlt_properties_get( properties, "factory" );
590 // Create the producer
591 mlt_producer producer = mlt_factory_producer( factory, resource );
594 if ( producer != NULL )
596 // Get the producer properties
597 mlt_properties producer_properties = MLT_PRODUCER_PROPERTIES( producer );
599 // Ensure that we loop
600 mlt_properties_set( producer_properties, "eof", "loop" );
602 // Now pass all producer. properties on the transition down
603 mlt_properties_pass( producer_properties, properties, "luma." );
605 // We will get the alpha frame from the producer
606 mlt_frame luma_frame = NULL;
608 // Get the luma frame
609 if ( mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &luma_frame, 0 ) == 0 )
612 mlt_image_format luma_format = mlt_image_yuv422;
614 // Get image from the luma producer
615 mlt_properties_set( MLT_FRAME_PROPERTIES( luma_frame ), "rescale.interp", "none" );
616 mlt_frame_get_image( luma_frame, &luma_image, &luma_format, &luma_width, &luma_height, 0 );
618 // Generate the luma map
619 if ( luma_image != NULL && luma_format == mlt_image_yuv422 )
620 luma_read_yuv422( luma_image, &orig_bitmap, luma_width, luma_height );
622 // Remember the original size for subsequent scaling
623 mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
624 mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
625 mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
627 // Cleanup the luma frame
628 mlt_frame_close( luma_frame );
631 // Cleanup the luma producer
632 mlt_producer_close( producer );
637 luma_bitmap = mlt_pool_alloc( width * height * sizeof( uint16_t ) );
638 scale_luma( luma_bitmap, width, height, orig_bitmap, luma_width, luma_height );
640 // Remember the scaled luma size to prevent unnecessary scaling
641 mlt_properties_set_int( properties, "_luma.width", width );
642 mlt_properties_set_int( properties, "_luma.height", height );
643 mlt_properties_set_data( properties, "_luma.bitmap", luma_bitmap, width * height * 2, mlt_pool_release, NULL );
648 /** Get the properly sized image from b_frame.
651 static int get_b_frame_image( mlt_transition this, mlt_frame b_frame, uint8_t **image, int *width, int *height, struct geometry_s *geometry )
654 mlt_image_format format = mlt_image_yuv422;
656 // Get the properties objects
657 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
658 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
660 if ( mlt_properties_get( properties, "distort" ) == NULL && mlt_properties_get( b_props, "distort" ) == NULL && geometry->item.distort == 0 )
662 // Adjust b_frame pixel aspect
663 int normalised_width = geometry->item.w;
664 int normalised_height = geometry->item.h;
665 int real_width = get_value( b_props, "real_width", "width" );
666 int real_height = get_value( b_props, "real_height", "height" );
667 double input_ar = mlt_frame_get_aspect_ratio( b_frame );
668 double output_ar = mlt_properties_get_double( b_props, "consumer_aspect_ratio" );
669 int scaled_width = input_ar / output_ar * real_width;
670 int scaled_height = real_height;
672 // Now ensure that our images fit in the normalised frame
673 if ( scaled_width > normalised_width )
675 scaled_height = scaled_height * normalised_width / scaled_width;
676 scaled_width = normalised_width;
678 if ( scaled_height > normalised_height )
680 scaled_width = scaled_width * normalised_height / scaled_height;
681 scaled_height = normalised_height;
684 // Now apply the fill
685 // TODO: Should combine fill/distort in one property
686 if ( mlt_properties_get( properties, "fill" ) != NULL )
688 scaled_width = ( geometry->item.w / scaled_width ) * scaled_width;
689 scaled_height = ( geometry->item.h / scaled_height ) * scaled_height;
692 // Save the new scaled dimensions
693 geometry->sw = scaled_width;
694 geometry->sh = scaled_height;
698 geometry->sw = geometry->item.w;
699 geometry->sh = geometry->item.h;
702 // We want to ensure that we bypass resize now...
703 mlt_properties_set( b_props, "distort", "true" );
705 // Take into consideration alignment for optimisation
706 if ( !mlt_properties_get_int( properties, "titles" ) )
707 alignment_calculate( geometry );
709 // Adjust to consumer scale
710 int x = geometry->item.x * *width / geometry->nw;
711 int y = geometry->item.y * *height / geometry->nh;
712 *width = geometry->sw * *width / geometry->nw;
713 *height = geometry->sh * *height / geometry->nh;
717 // optimization points - no work to do
718 if ( *width < 1 || *height < 1 )
721 if ( ( x < 0 && -x >= *width ) || ( y < 0 && -y >= *height ) )
724 ret = mlt_frame_get_image( b_frame, image, &format, width, height, 1 );
730 static mlt_geometry composite_calculate( mlt_transition this, struct geometry_s *result, mlt_frame a_frame, float position )
732 // Get the properties from the transition
733 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
735 // Get the properties from the frame
736 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
738 // Structures for geometry
739 mlt_geometry start = mlt_properties_get_data( properties, "geometries", NULL );
741 // Obtain the normalised width and height from the a_frame
742 int normalised_width = mlt_properties_get_int( a_props, "normalised_width" );
743 int normalised_height = mlt_properties_get_int( a_props, "normalised_height" );
745 // Now parse the geometries
748 // Parse the transitions properties
749 start = transition_parse_keys( this, normalised_width, normalised_height );
751 // Assign to properties to ensure we get destroyed
752 mlt_properties_set_data( properties, "geometries", start, 0, ( mlt_destructor )mlt_geometry_close, NULL );
756 int length = mlt_transition_get_out( this ) - mlt_transition_get_in( this ) + 1;
757 mlt_geometry_refresh( start, mlt_properties_get( properties, "geometry" ), length, normalised_width, normalised_height );
760 // Do the calculation
761 geometry_calculate( this, result, position );
763 // Assign normalised info
764 result->nw = normalised_width;
765 result->nh = normalised_height;
767 // Now parse the alignment
768 result->halign = alignment_parse( mlt_properties_get( properties, "halign" ) );
769 result->valign = alignment_parse( mlt_properties_get( properties, "valign" ) );
774 static inline void inline_memcpy( uint8_t *dest, uint8_t *src, int length )
776 uint8_t *end = src + length;
784 mlt_frame composite_copy_region( mlt_transition this, mlt_frame a_frame, mlt_position frame_position )
786 // Create a frame to return
787 mlt_frame b_frame = mlt_frame_init( );
789 // Get the properties of the a frame
790 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
792 // Get the properties of the b frame
793 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
796 int position = position_calculate( this, frame_position );
799 uint8_t *dest = NULL;
801 // Get the image and dimensions
802 uint8_t *image = mlt_properties_get_data( a_props, "image", NULL );
803 int width = mlt_properties_get_int( a_props, "width" );
804 int height = mlt_properties_get_int( a_props, "height" );
806 // Pointers for copy operation
818 // Will need to know region to copy
819 struct geometry_s result;
821 float delta = delta_calculate( this, a_frame );
823 // Calculate the region now
824 composite_calculate( this, &result, a_frame, position + delta / 2 );
826 // Need to scale down to actual dimensions
827 x = rint( 0.5 + result.item.x * width / result.nw );
828 y = rint( 0.5 + result.item.y * height / result.nh );
829 w = rint( 0.5 + result.item.w * width / result.nw );
830 h = rint( 0.5 + result.item.h * height / result.nh );
832 // Make sure that x and w are even
848 // Now we need to create a new destination image
849 dest = mlt_pool_alloc( w * h * 2 );
851 // Assign to the new frame
852 mlt_properties_set_data( b_props, "image", dest, w * h * 2, mlt_pool_release, NULL );
853 mlt_properties_set_int( b_props, "width", w );
854 mlt_properties_set_int( b_props, "height", h );
863 if ( y + h > height )
864 h -= ( y + h - height );
873 // Copy the region of the image
874 p = image + y * ss + x * 2;
878 inline_memcpy( dest, p, w * 2 );
883 // Assign this position to the b frame
884 mlt_frame_set_position( b_frame, frame_position );
885 mlt_properties_set( b_props, "distort", "true" );
894 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
896 // Get the b frame from the stack
897 mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
899 // Get the transition from the a frame
900 mlt_transition this = mlt_frame_pop_service( a_frame );
902 // This compositer is yuv422 only
903 *format = mlt_image_yuv422;
905 // Get the image from the a frame
906 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
908 // Get the properties from the transition
909 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
911 if ( b_frame != NULL )
913 // Get the properties of the a frame
914 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
916 // Get the properties of the b frame
917 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
919 // Structures for geometry
920 struct geometry_s result;
922 // Calculate the position
923 float position = mlt_properties_get_double( b_props, "relative_position" );
924 float delta = delta_calculate( this, a_frame );
926 // Get the image from the b frame
927 uint8_t *image_b = NULL;
928 int width_b = *width;
929 int height_b = *height;
931 // Do the calculation
932 composite_calculate( this, &result, a_frame, position );
934 // Optimisation - no compositing required
935 if ( result.item.mix == 0 || ( result.item.w == 0 && result.item.h == 0 ) )
938 // Need to keep the width/height of the a_frame on the b_frame for titling
939 if ( mlt_properties_get( a_props, "dest_width" ) == NULL )
941 mlt_properties_set_int( a_props, "dest_width", *width );
942 mlt_properties_set_int( a_props, "dest_height", *height );
943 mlt_properties_set_int( b_props, "dest_width", *width );
944 mlt_properties_set_int( b_props, "dest_height", *height );
948 mlt_properties_set_int( b_props, "dest_width", mlt_properties_get_int( a_props, "dest_width" ) );
949 mlt_properties_set_int( b_props, "dest_height", mlt_properties_get_int( a_props, "dest_height" ) );
952 // Since we are the consumer of the b_frame, we must pass along these
953 // consumer properties from the a_frame
954 mlt_properties_set_double( b_props, "consumer_deinterlace", mlt_properties_get_double( a_props, "consumer_deinterlace" ) );
955 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
956 mlt_properties_set_int( b_props, "normalised_width", mlt_properties_get_double( a_props, "normalised_width" ) );
957 mlt_properties_set_int( b_props, "normalised_height", mlt_properties_get_double( a_props, "normalised_height" ) );
959 // Special case for titling...
960 if ( mlt_properties_get_int( properties, "titles" ) )
962 if ( mlt_properties_get( b_props, "rescale.interp" ) == NULL )
963 mlt_properties_set( b_props, "rescale.interp", "hyper" );
964 mlt_properties_set( properties, "fill", NULL );
965 width_b = mlt_properties_get_int( a_props, "dest_width" );
966 height_b = mlt_properties_get_int( a_props, "dest_height" );
969 if ( get_b_frame_image( this, b_frame, &image_b, &width_b, &height_b, &result ) == 0 )
971 uint8_t *dest = *image;
972 uint8_t *src = image_b;
973 uint8_t *alpha = mlt_frame_get_alpha_mask( b_frame );
975 mlt_properties_get_int( a_props, "consumer_deinterlace" ) ||
976 mlt_properties_get_int( properties, "progressive" );
979 int32_t luma_softness = mlt_properties_get_double( properties, "softness" ) * ( 1 << 16 );
980 uint16_t *luma_bitmap = get_luma( properties, width_b, height_b );
981 //composite_line_fn line_fn = mlt_properties_get_int( properties, "_MMX" ) ? composite_line_yuv_mmx : NULL;
982 composite_line_fn line_fn = NULL;
984 for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
986 // Assume lower field (0) first
987 float field_position = position + field * delta;
989 // Do the calculation if we need to
990 composite_calculate( this, &result, a_frame, field_position );
992 if ( mlt_properties_get_int( properties, "titles" ) )
994 result.nw = result.item.w = *width;
995 result.nh = result.item.h = *height;
997 result.sh = height_b;
1001 alignment_calculate( &result );
1003 // Composite the b_frame on the a_frame
1004 composite_yuv( dest, *width, *height, src, width_b, height_b, alpha, result, progressive ? -1 : field, luma_bitmap, luma_softness, line_fn );
1012 /** Composition transition processing.
1015 static mlt_frame composite_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame )
1017 // Get a unique name to store the frame position
1018 char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( this ), "_unique_id" );
1020 // Assign the current position to the name
1021 mlt_properties_set_position( MLT_FRAME_PROPERTIES( a_frame ), name, mlt_frame_get_position( a_frame ) );
1023 // Propogate the transition properties to the b frame
1024 mlt_properties_set_double( MLT_FRAME_PROPERTIES( b_frame ), "relative_position", position_calculate( this, mlt_frame_get_position( a_frame ) ) );
1026 mlt_frame_push_service( a_frame, this );
1027 mlt_frame_push_frame( a_frame, b_frame );
1028 mlt_frame_push_get_image( a_frame, transition_get_image );
1032 /** Constructor for the filter.
1035 mlt_transition transition_composite_init( char *arg )
1037 mlt_transition this = calloc( sizeof( struct mlt_transition_s ), 1 );
1038 if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
1040 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
1042 this->process = composite_process;
1044 // Default starting motion and zoom
1045 mlt_properties_set( properties, "start", arg != NULL ? arg : "85%,5%:10%x10%" );
1048 mlt_properties_set( properties, "factory", "fezzik" );
1051 //mlt_properties_set_int( properties, "_MMX", composite_have_mmx() );