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_frame.h>
36 int nw; // normalised width
37 int nh; // normalised height
38 int sw; // scaled width, not including consumer scale based upon w/nw
39 int sh; // scaled height, not including consumer scale based upon h/nh
44 int halign; // horizontal alignment: 0=left, 1=center, 2=right
45 int valign; // vertical alignment: 0=top, 1=middle, 2=bottom
47 struct geometry_s *next;
50 /** Parse a value from a geometry string.
53 static float parse_value( char **ptr, int normalisation, char delim, float defaults )
55 float value = defaults;
57 if ( *ptr != NULL && **ptr != '\0' )
60 value = strtod( *ptr, &end );
64 value = ( value / 100.0 ) * normalisation;
65 while ( *end == delim || *end == '%' )
74 /** Parse a geometry property string with the syntax X,Y:WxH:MIX. Any value can be
75 expressed as a percentage by appending a % after the value, otherwise values are
76 assumed to be relative to the normalised dimensions of the consumer.
79 static void geometry_parse( struct geometry_s *geometry, struct geometry_s *defaults, char *property, int nw, int nh )
81 // Assign normalised width and height
85 // Assign from defaults if available
86 if ( defaults != NULL )
88 geometry->x = defaults->x;
89 geometry->y = defaults->y;
90 geometry->w = geometry->sw = defaults->w;
91 geometry->h = geometry->sh = defaults->h;
92 geometry->distort = defaults->distort;
93 geometry->mix = defaults->mix;
94 defaults->next = geometry;
101 // Parse the geomtry string
102 if ( property != NULL && strcmp( property, "" ) )
104 char *ptr = property;
105 geometry->x = parse_value( &ptr, nw, ',', geometry->x );
106 geometry->y = parse_value( &ptr, nh, ':', geometry->y );
107 geometry->w = geometry->sw = parse_value( &ptr, nw, 'x', geometry->w );
108 geometry->h = geometry->sh = parse_value( &ptr, nh, ':', geometry->h );
111 geometry->distort = 1;
116 geometry->mix = parse_value( &ptr, 100, ' ', geometry->mix );
120 /** Calculate real geometry.
123 static void geometry_calculate( struct geometry_s *output, struct geometry_s *in, float position )
125 // Search in for position
126 struct geometry_s *out = in->next;
128 while ( out->next != NULL )
130 if ( position >= in->position && position < out->position )
137 position = ( position - in->position ) / ( out->position - in->position );
139 // Calculate this frames geometry
142 output->x = in->x + ( out->x - in->x ) * position + 0.5;
143 output->y = in->y + ( out->y - in->y ) * position + 0.5;
144 output->w = in->w + ( out->w - in->w ) * position;
145 output->h = in->h + ( out->h - in->h ) * position;
146 output->mix = in->mix + ( out->mix - in->mix ) * position;
147 output->distort = in->distort;
150 /** Parse the alignment properties into the geometry.
153 static int alignment_parse( char* align )
157 if ( align == NULL );
158 else if ( isdigit( align[ 0 ] ) )
160 else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
162 else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
168 /** Adjust position according to scaled size and alignment properties.
171 static void alignment_calculate( struct geometry_s *geometry )
173 geometry->x += ( geometry->w - geometry->sw ) * geometry->halign / 2 + 0.5;
174 geometry->y += ( geometry->h - geometry->sh ) * geometry->valign / 2 + 0.5;
177 /** Calculate the position for this frame.
180 static inline float position_calculate( mlt_transition this, mlt_frame frame )
182 // Get the in and out position
183 mlt_position in = mlt_transition_get_in( this );
184 mlt_position out = mlt_transition_get_out( this );
187 mlt_position position = mlt_frame_get_position( frame );
190 return ( float )( position - in ) / ( float )( out - in + 1 );
193 /** Calculate the field delta for this frame - position between two frames.
196 static inline float delta_calculate( mlt_transition this, mlt_frame frame )
198 // Get the in and out position
199 mlt_position in = mlt_transition_get_in( this );
200 mlt_position out = mlt_transition_get_out( this );
202 // Get the position of the frame
203 mlt_position position = mlt_frame_get_position( frame );
206 float x = ( float )( position - in ) / ( float )( out - in + 1 );
207 float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
209 return ( y - x ) / 2.0;
212 static int get_value( mlt_properties properties, char *preferred, char *fallback )
214 int value = mlt_properties_get_int( properties, preferred );
216 value = mlt_properties_get_int( properties, fallback );
220 /** Composite function.
223 static int composite_yuv( uint8_t *p_dest, int width_dest, int height_dest, int bpp, uint8_t *p_src, int width_src, int height_src, uint8_t *p_alpha, struct geometry_s geometry, int field )
227 int x_src = 0, y_src = 0;
228 int32_t weight = ( 1 << 16 ) * ( geometry.mix / 100 );
229 int stride_src = width_src * bpp;
230 int stride_dest = width_dest * bpp;
232 // Adjust to consumer scale
233 int x = geometry.x * width_dest / geometry.nw + 0.5;
234 int y = geometry.y * height_dest / geometry.nh + 0.5;
239 // optimization points - no work to do
240 if ( width_src <= 0 || height_src <= 0 )
243 if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
246 // crop overlay off the left edge of frame
254 // crop overlay beyond right edge of frame
255 else if ( x + width_src > width_dest )
256 width_src = width_dest - x;
258 // crop overlay off the top edge of the frame
264 // crop overlay below bottom edge of frame
265 else if ( y + height_src > height_dest )
266 height_src = height_dest - y;
268 // offset pointer into overlay buffer based on cropping
269 p_src += x_src * bpp + y_src * stride_src;
271 // offset pointer into frame buffer based upon positive coordinates only!
272 p_dest += ( x < 0 ? 0 : x ) * bpp + ( y < 0 ? 0 : y ) * stride_dest;
274 // offset pointer into alpha channel based upon cropping
276 p_alpha += x_src + y_src * stride_src / bpp;
278 // Assuming lower field first
279 // Special care is taken to make sure the b_frame is aligned to the correct field.
280 // field 0 = lower field and y should be odd (y is 0-based).
281 // field 1 = upper field and y should be even.
282 if ( ( field > -1 ) && ( y % 2 == field ) )
284 //fprintf( stderr, "field %d y %d\n", field, y );
285 if ( ( field == 1 && y < height_dest - 1 ) || ( field == 0 && y == 0 ) )
286 p_dest += stride_dest;
288 p_dest -= stride_dest;
291 // On the second field, use the other lines from b_frame
296 p_alpha += stride_src / bpp;
303 uint8_t *z = p_alpha;
307 int step = ( field > -1 ) ? 2 : 1;
309 stride_src = stride_src * step;
310 int alpha_stride = stride_src / bpp;
311 stride_dest = stride_dest * step;
313 // now do the compositing only to cropped extents
314 for ( i = 0; i < height_src; i += step )
321 for ( j = 0; j < width_src; j ++ )
323 a = ( z == NULL ) ? 255 : *z ++;
324 value = ( weight * ( a + 1 ) ) >> 8;
325 *o ++ = ( *p++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
326 *o ++ = ( *p++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
330 p_dest += stride_dest;
332 p_alpha += alpha_stride;
339 /** Get the properly sized image from b_frame.
342 static int get_b_frame_image( mlt_transition this, mlt_frame b_frame, uint8_t **image, int *width, int *height, struct geometry_s *geometry )
345 mlt_image_format format = mlt_image_yuv422;
347 // Initialise the scaled dimensions from the computed
348 geometry->sw = geometry->w;
349 geometry->sh = geometry->h;
351 // Compute the dimensioning rectangle
352 mlt_properties b_props = mlt_frame_properties( b_frame );
353 mlt_properties properties = mlt_transition_properties( this );
355 if ( mlt_properties_get( properties, "distort" ) == NULL && geometry->distort == 0 )
357 // Adjust b_frame pixel aspect
358 int normalised_width = geometry->w;
359 int normalised_height = geometry->h;
360 int real_width = get_value( b_props, "real_width", "width" );
361 int real_height = get_value( b_props, "real_height", "height" );
362 int scaled_width = real_width;
363 int scaled_height = real_height;
365 // Now ensure that our images fit in the normalised frame
366 if ( scaled_width > normalised_width )
368 scaled_height = scaled_height * normalised_width / scaled_width;
369 scaled_width = normalised_width;
371 if ( scaled_height > normalised_height )
373 scaled_width = scaled_width * normalised_height / scaled_height;
374 scaled_height = normalised_height;
377 // Now we need to align to the geometry
378 if ( scaled_width <= geometry->w && scaled_height <= geometry->h )
380 // Save the new scaled dimensions
381 geometry->sw = scaled_width;
382 geometry->sh = scaled_height;
386 // We want to ensure that we bypass resize now...
387 mlt_properties_set( b_props, "distort", "true" );
389 // Take into consideration alignment for optimisation
390 alignment_calculate( geometry );
392 // Adjust to consumer scale
393 int x = geometry->x * *width / geometry->nw + 0.5;
394 int y = geometry->y * *height / geometry->nh + 0.5;
395 *width = geometry->sw * *width / geometry->nw;
396 *height = geometry->sh * *height / geometry->nh;
400 // optimization points - no work to do
401 if ( *width <= 0 || *height <= 0 )
404 if ( ( x < 0 && -x >= *width ) || ( y < 0 && -y >= *height ) )
407 ret = mlt_frame_get_image( b_frame, image, &format, width, height, 1 );
413 static uint8_t *transition_get_alpha_mask( mlt_frame this )
415 // Obtain properties of frame
416 mlt_properties properties = mlt_frame_properties( this );
418 // Return the alpha mask
419 return mlt_properties_get_data( properties, "alpha", NULL );
422 void transition_destroy_keys( void *arg )
424 struct geometry_s *ptr = arg;
425 struct geometry_s *next = NULL;
427 while ( ptr != NULL )
435 static struct geometry_s *transition_parse_keys( mlt_transition this, int normalised_width, int normalised_height )
437 // Loop variable for property interrogation
440 // Get the properties of the transition
441 mlt_properties properties = mlt_transition_properties( this );
443 // Get the in and out position
444 mlt_position in = mlt_transition_get_in( this );
445 mlt_position out = mlt_transition_get_out( this );
448 struct geometry_s *start = calloc( 1, sizeof( struct geometry_s ) );
450 // Create the end (we always need two entries)
451 struct geometry_s *end = calloc( 1, sizeof( struct geometry_s ) );
454 struct geometry_s *ptr = start;
456 // Parse the start property
457 geometry_parse( start, NULL, mlt_properties_get( properties, "start" ), normalised_width, normalised_height );
459 // Parse the keys in between
460 for ( i = 0; i < mlt_properties_count( properties ); i ++ )
462 // Get the name of the property
463 char *name = mlt_properties_get_name( properties, i );
465 // Check that it's valid
466 if ( !strncmp( name, "key[", 4 ) )
468 // Get the value of the property
469 char *value = mlt_properties_get_value( properties, i );
471 // Determine the frame number
472 int frame = atoi( name + 4 );
474 // Determine the position
477 if ( frame >= 0 && frame < ( out - in ) )
478 position = ( float )frame / ( float )( out - in + 1 );
479 else if ( frame < 0 && - frame < ( out - in ) )
480 position = ( float )( out - in + frame ) / ( float )( out - in + 1 );
482 // For now, we'll exclude all keys received out of order
483 if ( position > ptr->position )
485 // Create a new geometry
486 struct geometry_s *temp = calloc( 1, sizeof( struct geometry_s ) );
488 // Parse and add to the list
489 geometry_parse( temp, ptr, value, normalised_width, normalised_height );
491 // Assign the position
492 temp->position = position;
494 // Allow the next to be appended after this one
499 fprintf( stderr, "Key out of order - skipping %s\n", name );
505 geometry_parse( end, ptr, mlt_properties_get( properties, "end" ), normalised_width, normalised_height );
506 end->position = ( float )( out - in ) / ( float )( out - in + 1 );
508 // Assign to properties to ensure we get destroyed
509 mlt_properties_set_data( properties, "geometries", start, 0, transition_destroy_keys, NULL );
517 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
519 // Get the b frame from the stack
520 mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
522 // This compositer is yuv422 only
523 *format = mlt_image_yuv422;
525 // Get the transition from the a frame
526 mlt_transition this = mlt_frame_pop_service( a_frame );
528 // Get the image from the a frame
529 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
531 if ( b_frame != NULL )
533 // Get the properties of the a frame
534 mlt_properties a_props = mlt_frame_properties( a_frame );
536 // Get the properties of the b frame
537 mlt_properties b_props = mlt_frame_properties( b_frame );
539 // Get the properties from the transition
540 mlt_properties properties = mlt_transition_properties( this );
542 // Structures for geometry
543 struct geometry_s result;
544 struct geometry_s *start = mlt_properties_get_data( properties, "geometries", NULL );
546 // Calculate the position
547 float position = mlt_properties_get_double( b_props, "relative_position" );
548 float delta = delta_calculate( this, a_frame );
550 // Now parse the geometries
553 // Obtain the normalised width and height from the a_frame
554 int normalised_width = mlt_properties_get_int( a_props, "normalised_width" );
555 int normalised_height = mlt_properties_get_int( a_props, "normalised_height" );
557 // Parse the transitions properties
558 start = transition_parse_keys( this, normalised_width, normalised_height );
561 // Since we are the consumer of the b_frame, we must pass along these
562 // consumer properties from the a_frame
563 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
564 mlt_properties_set_double( b_props, "consumer_scale", mlt_properties_get_double( a_props, "consumer_scale" ) );
566 // Do the calculation
567 geometry_calculate( &result, start, position );
569 // Now parse the alignment
570 result.halign = alignment_parse( mlt_properties_get( properties, "halign" ) );
571 result.valign = alignment_parse( mlt_properties_get( properties, "valign" ) );
573 // Get the image from the b frame
575 int width_b = *width;
576 int height_b = *height;
578 if ( get_b_frame_image( this, b_frame, &image_b, &width_b, &height_b, &result ) == 0 )
580 uint8_t *dest = *image;
581 uint8_t *src = image_b;
583 uint8_t *alpha = mlt_frame_get_alpha_mask( b_frame );
584 int progressive = mlt_properties_get_int( a_props, "progressive" ) ||
585 mlt_properties_get_int( a_props, "consumer_progressive" ) ||
586 mlt_properties_get_int( properties, "progressive" );
589 for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
591 // Assume lower field (0) first
592 float field_position = position + field * delta;
594 // Do the calculation if we need to
595 geometry_calculate( &result, start, field_position );
598 alignment_calculate( &result );
600 // Composite the b_frame on the a_frame
601 composite_yuv( dest, *width, *height, bpp, src, width_b, height_b, alpha, result, progressive ? -1 : field );
609 /** Composition transition processing.
612 static mlt_frame composite_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame )
614 // Propogate the transition properties to the b frame
615 mlt_properties_set_double( mlt_frame_properties( b_frame ), "relative_position", position_calculate( this, a_frame ) );
616 mlt_frame_push_service( a_frame, this );
617 mlt_frame_push_get_image( a_frame, transition_get_image );
618 mlt_frame_push_frame( a_frame, b_frame );
622 /** Constructor for the filter.
625 mlt_transition transition_composite_init( char *arg )
627 mlt_transition this = calloc( sizeof( struct mlt_transition_s ), 1 );
628 if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
630 this->process = composite_process;
631 mlt_properties_set( mlt_transition_properties( this ), "start", arg != NULL ? arg : "85%,5%:10%x10%" );