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 );
45 int nw; // normalised width
46 int nh; // normalised height
47 int sw; // scaled width, not including consumer scale based upon w/nw
48 int sh; // scaled height, not including consumer scale based upon h/nh
53 int halign; // horizontal alignment: 0=left, 1=center, 2=right
54 int valign; // vertical alignment: 0=top, 1=middle, 2=bottom
56 struct geometry_s *next;
59 /** Parse a value from a geometry string.
62 static float parse_value( char **ptr, int normalisation, char delim, float defaults )
64 float value = defaults;
66 if ( *ptr != NULL && **ptr != '\0' )
69 value = strtod( *ptr, &end );
73 value = ( value / 100.0 ) * normalisation;
74 while ( *end == delim || *end == '%' )
83 /** Parse a geometry property string with the syntax X,Y:WxH:MIX. Any value can be
84 expressed as a percentage by appending a % after the value, otherwise values are
85 assumed to be relative to the normalised dimensions of the consumer.
88 static void geometry_parse( struct geometry_s *geometry, struct geometry_s *defaults, char *property, int nw, int nh )
90 // Assign normalised width and height
94 // Assign from defaults if available
95 if ( defaults != NULL )
97 geometry->x = defaults->x;
98 geometry->y = defaults->y;
99 geometry->w = geometry->sw = defaults->w;
100 geometry->h = geometry->sh = defaults->h;
101 geometry->distort = defaults->distort;
102 geometry->mix = defaults->mix;
103 defaults->next = geometry;
110 // Parse the geomtry string
111 if ( property != NULL && strcmp( property, "" ) )
113 char *ptr = property;
114 geometry->x = parse_value( &ptr, nw, ',', geometry->x );
115 geometry->y = parse_value( &ptr, nh, ':', geometry->y );
116 geometry->w = geometry->sw = parse_value( &ptr, nw, 'x', geometry->w );
117 geometry->h = geometry->sh = parse_value( &ptr, nh, ':', geometry->h );
120 geometry->distort = 1;
125 geometry->mix = parse_value( &ptr, 100, ' ', geometry->mix );
129 /** Calculate real geometry.
132 static void geometry_calculate( struct geometry_s *output, struct geometry_s *in, float position )
134 // Search in for position
135 struct geometry_s *out = in->next;
137 if ( position >= 1.0 )
139 int section = floor( position );
141 if ( section % 2 == 1 )
142 position = 1.0 - position;
145 while ( out->next != NULL )
147 if ( position >= in->position && position < out->position )
154 position = ( position - in->position ) / ( out->position - in->position );
156 // Calculate this frames geometry
159 output->x = in->x + ( out->x - in->x ) * position;
160 output->y = in->y + ( out->y - in->y ) * position;
161 output->w = in->w + ( out->w - in->w ) * position;
162 output->h = in->h + ( out->h - in->h ) * position;
163 output->mix = in->mix + ( out->mix - in->mix ) * position;
164 output->distort = in->distort;
166 // DRD> These break on negative values. I do not think they are needed
167 // since yuv_composite takes care of YUYV group alignment
168 //output->x = ( int )floor( output->x ) & 0xfffffffe;
169 //output->w = ( int )floor( output->w ) & 0xfffffffe;
170 //output->sw &= 0xfffffffe;
173 void transition_destroy_keys( void *arg )
175 struct geometry_s *ptr = arg;
176 struct geometry_s *next = NULL;
178 while ( ptr != NULL )
186 static struct geometry_s *transition_parse_keys( mlt_transition this, int normalised_width, int normalised_height )
188 // Loop variable for property interrogation
191 // Get the properties of the transition
192 mlt_properties properties = mlt_transition_properties( this );
194 // Get the in and out position
195 mlt_position in = mlt_transition_get_in( this );
196 mlt_position out = mlt_transition_get_out( this );
199 struct geometry_s *start = calloc( 1, sizeof( struct geometry_s ) );
201 // Create the end (we always need two entries)
202 struct geometry_s *end = calloc( 1, sizeof( struct geometry_s ) );
205 struct geometry_s *ptr = start;
207 // Parse the start property
208 geometry_parse( start, NULL, mlt_properties_get( properties, "start" ), normalised_width, normalised_height );
210 // Parse the keys in between
211 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
213 // Get the name of the property
214 char *name = mlt_properties_get_name( properties, i );
216 // Check that it's valid
217 if ( !strncmp( name, "key[", 4 ) )
219 // Get the value of the property
220 char *value = mlt_properties_get_value( properties, i );
222 // Determine the frame number
223 int frame = atoi( name + 4 );
225 // Determine the position
228 if ( frame >= 0 && frame < ( out - in ) )
229 position = ( float )frame / ( float )( out - in + 1 );
230 else if ( frame < 0 && - frame < ( out - in ) )
231 position = ( float )( out - in + frame ) / ( float )( out - in + 1 );
233 // For now, we'll exclude all keys received out of order
234 if ( position > ptr->position )
236 // Create a new geometry
237 struct geometry_s *temp = calloc( 1, sizeof( struct geometry_s ) );
239 // Parse and add to the list
240 geometry_parse( temp, ptr, value, normalised_width, normalised_height );
242 // Assign the position
243 temp->position = position;
245 // Allow the next to be appended after this one
250 fprintf( stderr, "Key out of order - skipping %s\n", name );
256 geometry_parse( end, ptr, mlt_properties_get( properties, "end" ), normalised_width, normalised_height );
258 end->position = ( float )( out - in ) / ( float )( out - in + 1 );
262 // Assign to properties to ensure we get destroyed
263 mlt_properties_set_data( properties, "geometries", start, 0, transition_destroy_keys, NULL );
268 /** Parse the alignment properties into the geometry.
271 static int alignment_parse( char* align )
275 if ( align == NULL );
276 else if ( isdigit( align[ 0 ] ) )
278 else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
280 else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
286 /** Adjust position according to scaled size and alignment properties.
289 static void alignment_calculate( struct geometry_s *geometry )
291 geometry->x += ( geometry->w - geometry->sw ) * geometry->halign / 2;
292 geometry->y += ( geometry->h - geometry->sh ) * geometry->valign / 2;
295 /** Calculate the position for this frame.
298 static float position_calculate( mlt_transition this, mlt_position position )
300 // Get the in and out position
301 mlt_position in = mlt_transition_get_in( this );
302 mlt_position out = mlt_transition_get_out( this );
305 return ( float )( position - in ) / ( float )( out - in + 1 );
308 /** Calculate the field delta for this frame - position between two frames.
311 static inline float delta_calculate( mlt_transition this, mlt_frame frame )
313 // Get the in and out position
314 mlt_position in = mlt_transition_get_in( this );
315 mlt_position out = mlt_transition_get_out( this );
317 // Get the position of the frame
318 mlt_position position = mlt_frame_get_position( frame );
321 float x = ( float )( position - in ) / ( float )( out - in + 1 );
322 float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
324 return ( y - x ) / 2.0;
327 static int get_value( mlt_properties properties, char *preferred, char *fallback )
329 int value = mlt_properties_get_int( properties, preferred );
331 value = mlt_properties_get_int( properties, fallback );
335 /** A linear threshold determination function.
338 static inline int32_t linearstep( int32_t edge1, int32_t edge2, int32_t a )
346 return ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
349 /** A smoother, non-linear threshold determination function.
352 static inline int32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
360 a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
362 return ( ( ( a * a ) >> 16 ) * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
365 /** Load the luma map from PGM stream.
368 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
370 uint8_t *data = NULL;
382 // get the magic code
383 if ( fgets( line, 127, f ) == NULL )
387 while ( sscanf( line, " #%s", comment ) > 0 )
388 if ( fgets( line, 127, f ) == NULL )
391 if ( line[0] != 'P' || line[1] != '5' )
394 // skip white space and see if a new line must be fetched
395 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
396 if ( ( line[i] == '\0' || line[i] == '#' ) && fgets( line, 127, f ) == NULL )
400 while ( sscanf( line, " #%s", comment ) > 0 )
401 if ( fgets( line, 127, f ) == NULL )
404 // get the dimensions
405 if ( line[0] == 'P' )
406 i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
408 i = sscanf( line, "%d %d %d", width, height, &maxval );
410 // get the height value, if not yet
413 if ( fgets( line, 127, f ) == NULL )
417 while ( sscanf( line, " #%s", comment ) > 0 )
418 if ( fgets( line, 127, f ) == NULL )
421 i = sscanf( line, "%d", height );
428 // get the maximum gray value, if not yet
431 if ( fgets( line, 127, f ) == NULL )
435 while ( sscanf( line, " #%s", comment ) > 0 )
436 if ( fgets( line, 127, f ) == NULL )
439 i = sscanf( line, "%d", &maxval );
444 // determine if this is one or two bytes per pixel
445 bpp = maxval > 255 ? 2 : 1;
447 // allocate temporary storage for the raw data
448 data = mlt_pool_alloc( *width * *height * bpp );
453 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
456 // allocate the luma bitmap
457 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
461 // proces the raw data into the luma bitmap
462 for ( i = 0; i < *width * *height * bpp; i += bpp )
465 *p++ = data[ i ] << 8;
467 *p++ = ( data[ i ] << 8 ) + data[ i + 1 ];
474 mlt_pool_release( data );
477 /** Generate a luma map from any YUV image.
480 static void luma_read_yuv422( uint8_t *image, uint16_t **map, int width, int height )
484 // allocate the luma bitmap
485 uint16_t *p = *map = ( uint16_t* )mlt_pool_alloc( width * height * sizeof( uint16_t ) );
489 // proces the image data into the luma bitmap
490 for ( i = 0; i < width * height * 2; i += 2 )
491 *p++ = ( image[ i ] - 16 ) * 299; // 299 = 65535 / 219
495 /** Composite a source line over a destination line
499 void composite_line_yuv( uint8_t *dest, uint8_t *src, int width_src, uint8_t *alpha, int weight, uint16_t *luma, int softness )
504 for ( j = 0; j < width_src; j ++ )
506 a = ( alpha == NULL ) ? 255 : *alpha ++;
507 mix = ( luma == NULL ) ? weight : linearstep( luma[ j ], luma[ j ] + softness, weight );
508 mix = ( mix * ( a + 1 ) ) >> 8;
509 *dest = ( *src++ * mix + *dest * ( ( 1 << 16 ) - mix ) ) >> 16;
511 *dest = ( *src++ * mix + *dest * ( ( 1 << 16 ) - mix ) ) >> 16;
516 /** Composite function.
519 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 )
523 int x_src = 0, y_src = 0;
524 int32_t weight = ( 1 << 16 ) * ( geometry.mix / 100 );
525 int step = ( field > -1 ) ? 2 : 1;
527 int stride_src = width_src * bpp * step;
528 int stride_dest = width_dest * bpp * step;
529 int alpha_stride = stride_src / bpp;
531 // Adjust to consumer scale
532 int x = geometry.x * width_dest / geometry.nw;
533 int y = geometry.y * height_dest / geometry.nh;
535 // Align x to a full YUYV group
537 width_src &= 0xfffffffe;
539 // optimization points - no work to do
540 if ( width_src <= 0 || height_src <= 0 )
543 if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
546 // crop overlay off the left edge of frame
554 // crop overlay beyond right edge of frame
555 else if ( x + width_src > width_dest )
556 width_src = width_dest - x;
558 // crop overlay off the top edge of the frame
564 // crop overlay below bottom edge of frame
565 else if ( y + height_src > height_dest )
566 height_src = height_dest - y;
568 // offset pointer into overlay buffer based on cropping
569 p_src += x_src * bpp + y_src * stride_src;
571 // offset pointer into frame buffer based upon positive coordinates only!
572 p_dest += ( x < 0 ? 0 : x ) * bpp + ( y < 0 ? 0 : y ) * stride_dest;
574 // offset pointer into alpha channel based upon cropping
576 p_alpha += x_src + y_src * stride_src / bpp;
578 // offset pointer into luma channel based upon cropping
580 p_luma += x_src + y_src * stride_src / bpp;
582 // Assuming lower field first
583 // Special care is taken to make sure the b_frame is aligned to the correct field.
584 // field 0 = lower field and y should be odd (y is 0-based).
585 // field 1 = upper field and y should be even.
586 if ( ( field > -1 ) && ( y % 2 == field ) )
588 //fprintf( stderr, "field %d y %d\n", field, y );
589 if ( ( field == 1 && y < height_dest - 1 ) || ( field == 0 && y == 0 ) )
590 p_dest += stride_dest;
592 p_dest -= stride_dest;
595 // On the second field, use the other lines from b_frame
600 p_alpha += stride_src / bpp;
604 if ( line_fn == NULL )
605 line_fn = composite_line_yuv;
607 // now do the compositing only to cropped extents
608 for ( i = 0; i < height_src; i += step )
610 line_fn( p_dest, p_src, width_src, p_alpha, weight, p_luma, softness );
613 p_dest += stride_dest;
615 p_alpha += alpha_stride;
617 p_luma += alpha_stride;
624 /** Scale 16bit greyscale luma map using nearest neighbor.
628 scale_luma ( uint16_t *dest_buf, int dest_width, int dest_height, const uint16_t *src_buf, int src_width, int src_height )
631 register int x_step = ( src_width << 16 ) / dest_width;
632 register int y_step = ( src_height << 16 ) / dest_height;
633 register int x, y = 0;
635 for ( i = 0; i < dest_height; i++ )
637 const uint16_t *src = src_buf + ( y >> 16 ) * src_width;
640 for ( j = 0; j < dest_width; j++ )
642 *dest_buf++ = src[ x >> 16 ];
649 static uint16_t* get_luma( mlt_properties properties, int width, int height )
651 // The cached luma map information
652 int luma_width = mlt_properties_get_int( properties, "_luma.width" );
653 int luma_height = mlt_properties_get_int( properties, "_luma.height" );
654 uint16_t *luma_bitmap = mlt_properties_get_data( properties, "_luma.bitmap", NULL );
656 // If the filename property changed, reload the map
657 char *resource = mlt_properties_get( properties, "luma" );
659 if ( resource != NULL && ( luma_bitmap == NULL || luma_width != width || luma_height != height ) )
661 uint16_t *orig_bitmap = mlt_properties_get_data( properties, "_luma.orig_bitmap", NULL );
662 luma_width = mlt_properties_get_int( properties, "_luma.orig_width" );
663 luma_height = mlt_properties_get_int( properties, "_luma.orig_height" );
665 // Load the original luma once
666 if ( orig_bitmap == NULL )
668 char *extension = extension = strrchr( resource, '.' );
670 // See if it is a PGM
671 if ( extension != NULL && strcmp( extension, ".pgm" ) == 0 )
674 FILE *f = fopen( resource, "r" );
678 luma_read_pgm( f, &orig_bitmap, &luma_width, &luma_height );
681 // Remember the original size for subsequent scaling
682 mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
683 mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
684 mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
689 // Get the factory producer service
690 char *factory = mlt_properties_get( properties, "factory" );
692 // Create the producer
693 mlt_producer producer = mlt_factory_producer( factory, resource );
696 if ( producer != NULL )
698 // Get the producer properties
699 mlt_properties producer_properties = mlt_producer_properties( producer );
701 // Ensure that we loop
702 mlt_properties_set( producer_properties, "eof", "loop" );
704 // Now pass all producer. properties on the transition down
705 mlt_properties_pass( producer_properties, properties, "luma." );
707 // We will get the alpha frame from the producer
708 mlt_frame luma_frame = NULL;
710 // Get the luma frame
711 if ( mlt_service_get_frame( mlt_producer_service( producer ), &luma_frame, 0 ) == 0 )
714 mlt_image_format luma_format = mlt_image_yuv422;
716 // Get image from the luma producer
717 mlt_properties_set( mlt_frame_properties( luma_frame ), "rescale.interp", "none" );
718 mlt_frame_get_image( luma_frame, &luma_image, &luma_format, &luma_width, &luma_height, 0 );
720 // Generate the luma map
721 if ( luma_image != NULL && luma_format == mlt_image_yuv422 )
722 luma_read_yuv422( luma_image, &orig_bitmap, luma_width, luma_height );
724 // Remember the original size for subsequent scaling
725 mlt_properties_set_data( properties, "_luma.orig_bitmap", orig_bitmap, luma_width * luma_height * 2, mlt_pool_release, NULL );
726 mlt_properties_set_int( properties, "_luma.orig_width", luma_width );
727 mlt_properties_set_int( properties, "_luma.orig_height", luma_height );
729 // Cleanup the luma frame
730 mlt_frame_close( luma_frame );
733 // Cleanup the luma producer
734 mlt_producer_close( producer );
739 luma_bitmap = mlt_pool_alloc( width * height * sizeof( uint16_t ) );
740 scale_luma( luma_bitmap, width, height, orig_bitmap, luma_width, luma_height );
742 // Remember the scaled luma size to prevent unnecessary scaling
743 mlt_properties_set_int( properties, "_luma.width", width );
744 mlt_properties_set_int( properties, "_luma.height", height );
745 mlt_properties_set_data( properties, "_luma.bitmap", luma_bitmap, width * height * 2, mlt_pool_release, NULL );
750 /** Get the properly sized image from b_frame.
753 static int get_b_frame_image( mlt_transition this, mlt_frame b_frame, uint8_t **image, int *width, int *height, struct geometry_s *geometry )
756 mlt_image_format format = mlt_image_yuv422;
758 // Get the properties objects
759 mlt_properties b_props = mlt_frame_properties( b_frame );
760 mlt_properties properties = mlt_transition_properties( this );
762 if ( mlt_properties_get( properties, "distort" ) == NULL && geometry->distort == 0 )
764 // Adjust b_frame pixel aspect
765 int normalised_width = geometry->w;
766 int normalised_height = geometry->h;
767 int real_width = get_value( b_props, "real_width", "width" );
768 int real_height = get_value( b_props, "real_height", "height" );
769 double input_ar = mlt_frame_get_aspect_ratio( b_frame );
770 double output_ar = mlt_properties_get_double( b_props, "consumer_aspect_ratio" );
771 int scaled_width = input_ar / output_ar * real_width;
772 int scaled_height = real_height;
774 // Now ensure that our images fit in the normalised frame
775 if ( scaled_width > normalised_width )
777 scaled_height = scaled_height * normalised_width / scaled_width;
778 scaled_width = normalised_width;
780 if ( scaled_height > normalised_height )
782 scaled_width = scaled_width * normalised_height / scaled_height;
783 scaled_height = normalised_height;
786 // Now apply the fill
787 // TODO: Should combine fill/distort in one property
788 if ( mlt_properties_get( properties, "fill" ) != NULL )
790 scaled_width = ( geometry->w / scaled_width ) * scaled_width;
791 scaled_height = ( geometry->h / scaled_height ) * scaled_height;
794 // Save the new scaled dimensions
795 geometry->sw = scaled_width;
796 geometry->sh = scaled_height;
800 geometry->sw = geometry->w;
801 geometry->sh = geometry->h;
804 // We want to ensure that we bypass resize now...
805 mlt_properties_set( b_props, "distort", "true" );
807 // Take into consideration alignment for optimisation
808 alignment_calculate( geometry );
810 // Adjust to consumer scale
811 int x = geometry->x * *width / geometry->nw;
812 int y = geometry->y * *height / geometry->nh;
813 *width = geometry->sw * *width / geometry->nw;
814 *height = geometry->sh * *height / geometry->nh;
818 // optimization points - no work to do
819 if ( *width < 1 || *height < 1 )
822 if ( ( x < 0 && -x >= *width ) || ( y < 0 && -y >= *height ) )
825 ret = mlt_frame_get_image( b_frame, image, &format, width, height, 1 );
831 struct geometry_s *composite_calculate( struct geometry_s *result, mlt_transition this, mlt_frame a_frame, float position )
833 // Get the properties from the transition
834 mlt_properties properties = mlt_transition_properties( this );
836 // Get the properties from the frame
837 mlt_properties a_props = mlt_frame_properties( a_frame );
839 // Structures for geometry
840 struct geometry_s *start = mlt_properties_get_data( properties, "geometries", NULL );
842 // Now parse the geometries
845 // Obtain the normalised width and height from the a_frame
846 int normalised_width = mlt_properties_get_int( a_props, "normalised_width" );
847 int normalised_height = mlt_properties_get_int( a_props, "normalised_height" );
849 // Parse the transitions properties
850 start = transition_parse_keys( this, normalised_width, normalised_height );
853 // Do the calculation
854 geometry_calculate( result, start, position );
856 // Now parse the alignment
857 result->halign = alignment_parse( mlt_properties_get( properties, "halign" ) );
858 result->valign = alignment_parse( mlt_properties_get( properties, "valign" ) );
863 mlt_frame composite_copy_region( mlt_transition this, mlt_frame a_frame, mlt_position frame_position )
865 // Create a frame to return
866 mlt_frame b_frame = mlt_frame_init( );
868 // Get the properties of the a frame
869 mlt_properties a_props = mlt_frame_properties( a_frame );
871 // Get the properties of the b frame
872 mlt_properties b_props = mlt_frame_properties( b_frame );
875 float position = position_calculate( this, frame_position );
878 uint8_t *dest = NULL;
880 // Get the image and dimensions
881 uint8_t *image = mlt_properties_get_data( a_props, "image", NULL );
882 int width = mlt_properties_get_int( a_props, "width" );
883 int height = mlt_properties_get_int( a_props, "height" );
885 // Pointers for copy operation
896 // Will need to know region to copy
897 struct geometry_s result;
899 // Calculate the region now
900 composite_calculate( &result, this, a_frame, position );
902 // Need to scale down to actual dimensions
903 x = result.x * width / result.nw ;
904 y = result.y * height / result.nh;
905 w = result.w * width / result.nw;
906 h = result.h * height / result.nh;
911 // Now we need to create a new destination image
912 dest = mlt_pool_alloc( w * h * 2 );
914 // Copy the region of the image
915 p = image + y * width * 2 + x * 2;
917 r = dest + w * h * 2;
921 memcpy( q, p, w * 2 );
926 // Assign to the new frame
927 mlt_properties_set_data( b_props, "image", dest, w * h * 2, mlt_pool_release, NULL );
928 mlt_properties_set_int( b_props, "width", w );
929 mlt_properties_set_int( b_props, "height", h );
931 // Assign this position to the b frame
932 mlt_frame_set_position( b_frame, frame_position );
941 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
943 // Get the b frame from the stack
944 mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
946 // Get the transition from the a frame
947 mlt_transition this = mlt_frame_pop_service( a_frame );
949 // This compositer is yuv422 only
950 *format = mlt_image_yuv422;
952 // Get the image from the a frame
953 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
955 if ( b_frame != NULL )
957 // Get the properties of the a frame
958 mlt_properties a_props = mlt_frame_properties( a_frame );
960 // Get the properties of the b frame
961 mlt_properties b_props = mlt_frame_properties( b_frame );
963 // Get the properties from the transition
964 mlt_properties properties = mlt_transition_properties( this );
966 // Structures for geometry
967 struct geometry_s result;
969 // Calculate the position
970 float position = mlt_properties_get_double( b_props, "relative_position" );
971 float delta = delta_calculate( this, a_frame );
973 // Do the calculation
974 struct geometry_s *start = composite_calculate( &result, this, a_frame, position );
976 // Optimisation - no compositing required
977 if ( result.mix == 0 || ( result.w == 0 && result.h == 0 ) )
980 // Since we are the consumer of the b_frame, we must pass along these
981 // consumer properties from the a_frame
982 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
984 // Get the image from the b frame
985 uint8_t *image_b = NULL;
986 int width_b = *width;
987 int height_b = *height;
989 if ( get_b_frame_image( this, b_frame, &image_b, &width_b, &height_b, &result ) == 0 )
991 uint8_t *dest = *image;
992 uint8_t *src = image_b;
993 uint8_t *alpha = mlt_frame_get_alpha_mask( b_frame );
994 int progressive = mlt_properties_get_int( a_props, "progressive" ) ||
995 mlt_properties_get_int( a_props, "consumer_progressive" ) ||
996 mlt_properties_get_int( properties, "progressive" );
999 int32_t luma_softness = mlt_properties_get_double( properties, "softness" ) * ( 1 << 16 );
1000 uint16_t *luma_bitmap = get_luma( properties, width_b, height_b );
1001 composite_line_fn line_fn = mlt_properties_get_int( properties, "_MMX" ) ? composite_line_yuv_mmx : composite_line_yuv;
1003 for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
1005 // Assume lower field (0) first
1006 float field_position = position + field * delta;
1008 // Do the calculation if we need to
1009 geometry_calculate( &result, start, field_position );
1012 alignment_calculate( &result );
1014 // Composite the b_frame on the a_frame
1015 composite_yuv( dest, *width, *height, src, width_b, height_b, alpha, result, progressive ? -1 : field, luma_bitmap, luma_softness, line_fn );
1023 /** Composition transition processing.
1026 static mlt_frame composite_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame )
1028 // Propogate the transition properties to the b frame
1029 mlt_properties_set_double( mlt_frame_properties( b_frame ), "relative_position", position_calculate( this, mlt_frame_get_position( a_frame ) ) );
1030 mlt_frame_push_service( a_frame, this );
1031 mlt_frame_push_frame( a_frame, b_frame );
1032 mlt_frame_push_get_image( a_frame, transition_get_image );
1036 /** Constructor for the filter.
1039 mlt_transition transition_composite_init( char *arg )
1041 mlt_transition this = calloc( sizeof( struct mlt_transition_s ), 1 );
1042 if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
1044 mlt_properties properties = mlt_transition_properties( this );
1046 this->process = composite_process;
1048 // Default starting motion and zoom
1049 mlt_properties_set( properties, "start", arg != NULL ? arg : "85%,5%:10%x10%" );
1052 mlt_properties_set( properties, "factory", "fezzik" );
1055 //mlt_properties_set_int( properties, "_MMX", composite_have_mmx() );