2 * transition_affine.c -- affine transformations
3 * Copyright (C) 2003-2010 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
5 * Author: Dan Dennedy <dan@dennedy.org>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <framework/mlt_transition.h>
23 #include <framework/mlt.h>
33 /** Calculate real geometry.
36 static void geometry_calculate( mlt_transition this, const char *store, struct mlt_geometry_item_s *output, float position )
38 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
39 mlt_geometry geometry = mlt_properties_get_data( properties, store, NULL );
40 int mirror_off = mlt_properties_get_int( properties, "mirror_off" );
41 int repeat_off = mlt_properties_get_int( properties, "repeat_off" );
42 int length = mlt_geometry_get_length( geometry );
45 if ( !repeat_off && position >= length && length != 0 )
47 int section = position / length;
48 position -= section * length;
49 if ( !mirror_off && section % 2 == 1 )
50 position = length - position;
53 // Fetch the key for the position
54 mlt_geometry_fetch( geometry, output, position );
58 static mlt_geometry transition_parse_keys( mlt_transition this, const char *name, const char *store, int normalised_width, int normalised_height )
60 // Get the properties of the transition
61 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
63 // Try to fetch it first
64 mlt_geometry geometry = mlt_properties_get_data( properties, store, NULL );
66 // Get the in and out position
67 mlt_position in = mlt_transition_get_in( this );
68 mlt_position out = mlt_transition_get_out( this );
70 // Determine length and obtain cycle
71 int length = out - in + 1;
72 double cycle = mlt_properties_get_double( properties, "cycle" );
74 // Allow a geometry repeat cycle
80 if ( geometry == NULL )
82 // Get the new style geometry string
83 char *property = mlt_properties_get( properties, name );
85 // Create an empty geometries object
86 geometry = mlt_geometry_init( );
88 // Parse the geometry if we have one
89 mlt_geometry_parse( geometry, property, length, normalised_width, normalised_height );
92 mlt_properties_set_data( properties, store, geometry, 0, ( mlt_destructor )mlt_geometry_close, NULL );
96 // Check for updates and refresh if necessary
97 mlt_geometry_refresh( geometry, mlt_properties_get( properties, name ), length, normalised_width, normalised_height );
103 static mlt_geometry composite_calculate( mlt_transition this, struct mlt_geometry_item_s *result, int nw, int nh, float position )
105 // Structures for geometry
106 mlt_geometry start = transition_parse_keys( this, "geometry", "geometries", nw, nh );
108 // Do the calculation
109 geometry_calculate( this, "geometries", result, position );
114 static inline float composite_calculate_key( mlt_transition this, const char *name, const char *store, int norm, float position )
116 // Struct for the result
117 struct mlt_geometry_item_s result;
119 // Structures for geometry
120 transition_parse_keys( this, name, store, norm, 0 );
122 // Do the calculation
123 geometry_calculate( this, store, &result, position );
134 static void affine_init( float this[3][3] )
147 // Multiply two this affine transform with that
148 static void affine_multiply( float this[3][3], float that[3][3] )
154 for ( i = 0; i < 3; i ++ )
155 for ( j = 0; j < 3; j ++ )
156 output[i][j] = this[i][0] * that[j][0] + this[i][1] * that[j][1] + this[i][2] * that[j][2];
158 this[0][0] = output[0][0];
159 this[0][1] = output[0][1];
160 this[0][2] = output[0][2];
161 this[1][0] = output[1][0];
162 this[1][1] = output[1][1];
163 this[1][2] = output[1][2];
164 this[2][0] = output[2][0];
165 this[2][1] = output[2][1];
166 this[2][2] = output[2][2];
169 // Rotate by a given angle
170 static void affine_rotate_x( float this[3][3], float angle )
173 affine[0][0] = cos( angle * M_PI / 180 );
174 affine[0][1] = 0 - sin( angle * M_PI / 180 );
176 affine[1][0] = sin( angle * M_PI / 180 );
177 affine[1][1] = cos( angle * M_PI / 180 );
182 affine_multiply( this, affine );
185 static void affine_rotate_y( float this[3][3], float angle )
188 affine[0][0] = cos( angle * M_PI / 180 );
190 affine[0][2] = 0 - sin( angle * M_PI / 180 );
194 affine[2][0] = sin( angle * M_PI / 180 );
196 affine[2][2] = cos( angle * M_PI / 180 );
197 affine_multiply( this, affine );
200 static void affine_rotate_z( float this[3][3], float angle )
207 affine[1][1] = cos( angle * M_PI / 180 );
208 affine[1][2] = sin( angle * M_PI / 180 );
210 affine[2][1] = - sin( angle * M_PI / 180 );
211 affine[2][2] = cos( angle * M_PI / 180 );
212 affine_multiply( this, affine );
215 static void affine_scale( float this[3][3], float sx, float sy )
227 affine_multiply( this, affine );
230 // Shear by a given value
231 static void affine_shear( float this[3][3], float shear_x, float shear_y, float shear_z )
235 affine[0][1] = tan( shear_x * M_PI / 180 );
237 affine[1][0] = tan( shear_y * M_PI / 180 );
239 affine[1][2] = tan( shear_z * M_PI / 180 );
243 affine_multiply( this, affine );
246 static void affine_offset( float this[3][3], float x, float y )
252 // Obtain the mapped x coordinate of the input
253 static inline double MapX( float this[3][3], float x, float y )
255 return this[0][0] * x + this[0][1] * y + this[0][2];
258 // Obtain the mapped y coordinate of the input
259 static inline double MapY( float this[3][3], float x, float y )
261 return this[1][0] * x + this[1][1] * y + this[1][2];
264 static inline double MapZ( float this[3][3], float x, float y )
266 return this[2][0] * x + this[2][1] * y + this[2][2];
269 #define MAX( x, y ) x > y ? x : y
270 #define MIN( x, y ) x < y ? x : y
272 static void affine_max_output( float this[3][3], float *w, float *h, float dz, float max_width, float max_height )
274 int tlx = MapX( this, -max_width, max_height ) / dz;
275 int tly = MapY( this, -max_width, max_height ) / dz;
276 int trx = MapX( this, max_width, max_height ) / dz;
277 int try = MapY( this, max_width, max_height ) / dz;
278 int blx = MapX( this, -max_width, -max_height ) / dz;
279 int bly = MapY( this, -max_width, -max_height ) / dz;
280 int brx = MapX( this, max_width, -max_height ) / dz;
281 int bry = MapY( this, max_width, -max_height ) / dz;
288 max_x = MAX( tlx, trx );
289 max_x = MAX( max_x, blx );
290 max_x = MAX( max_x, brx );
292 min_x = MIN( tlx, trx );
293 min_x = MIN( min_x, blx );
294 min_x = MIN( min_x, brx );
296 max_y = MAX( tly, try );
297 max_y = MAX( max_y, bly );
298 max_y = MAX( max_y, bry );
300 min_y = MIN( tly, try );
301 min_y = MIN( min_y, bly );
302 min_y = MIN( min_y, bry );
304 *w = ( float )( max_x - min_x + 1 ) / max_width / 2.0;
305 *h = ( float )( max_y - min_y + 1 ) / max_height / 2.0;
308 #define IN_RANGE( v, r ) ( v >= - r / 2 && v < r / 2 )
310 static inline void get_affine( affine_t *affine, mlt_transition this, float position )
312 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
313 int keyed = mlt_properties_get_int( properties, "keyed" );
317 float fix_rotate_x = mlt_properties_get_double( properties, "fix_rotate_x" );
318 float fix_rotate_y = mlt_properties_get_double( properties, "fix_rotate_y" );
319 float fix_rotate_z = mlt_properties_get_double( properties, "fix_rotate_z" );
320 float rotate_x = mlt_properties_get_double( properties, "rotate_x" );
321 float rotate_y = mlt_properties_get_double( properties, "rotate_y" );
322 float rotate_z = mlt_properties_get_double( properties, "rotate_z" );
323 float fix_shear_x = mlt_properties_get_double( properties, "fix_shear_x" );
324 float fix_shear_y = mlt_properties_get_double( properties, "fix_shear_y" );
325 float fix_shear_z = mlt_properties_get_double( properties, "fix_shear_z" );
326 float shear_x = mlt_properties_get_double( properties, "shear_x" );
327 float shear_y = mlt_properties_get_double( properties, "shear_y" );
328 float shear_z = mlt_properties_get_double( properties, "shear_z" );
329 float ox = mlt_properties_get_double( properties, "ox" );
330 float oy = mlt_properties_get_double( properties, "oy" );
332 affine_rotate_x( affine->matrix, fix_rotate_x + rotate_x * position );
333 affine_rotate_y( affine->matrix, fix_rotate_y + rotate_y * position );
334 affine_rotate_z( affine->matrix, fix_rotate_z + rotate_z * position );
335 affine_shear( affine->matrix,
336 fix_shear_x + shear_x * position,
337 fix_shear_y + shear_y * position,
338 fix_shear_z + shear_z * position );
339 affine_offset( affine->matrix, ox, oy );
343 float rotate_x = composite_calculate_key( this, "rotate_x", "rotate_x_info", 360, position );
344 float rotate_y = composite_calculate_key( this, "rotate_y", "rotate_y_info", 360, position );
345 float rotate_z = composite_calculate_key( this, "rotate_z", "rotate_z_info", 360, position );
346 float shear_x = composite_calculate_key( this, "shear_x", "shear_x_info", 360, position );
347 float shear_y = composite_calculate_key( this, "shear_y", "shear_y_info", 360, position );
348 float shear_z = composite_calculate_key( this, "shear_z", "shear_z_info", 360, position );
350 affine_rotate_x( affine->matrix, rotate_x );
351 affine_rotate_y( affine->matrix, rotate_y );
352 affine_rotate_z( affine->matrix, rotate_z );
353 affine_shear( affine->matrix, shear_x, shear_y, shear_z );
360 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
362 // Get the b frame from the stack
363 mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
365 // Get the transition object
366 mlt_transition this = mlt_frame_pop_service( a_frame );
368 // Get the properties of the transition
369 mlt_properties properties = MLT_TRANSITION_PROPERTIES( this );
371 // Get the properties of the a frame
372 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
374 // Get the properties of the b frame
375 mlt_properties b_props = MLT_FRAME_PROPERTIES( b_frame );
377 // Image, format, width, height and image for the b frame
378 uint8_t *b_image = NULL;
379 mlt_image_format b_format = mlt_image_rgb24a;
383 // Get the unique name to retrieve the frame position
384 char *name = mlt_properties_get( properties, "_unique_id" );
386 // Assign the current position to the name
387 mlt_position position = mlt_properties_get_position( a_props, name );
388 mlt_position in = mlt_properties_get_position( properties, "in" );
389 mlt_position out = mlt_properties_get_position( properties, "out" );
390 int mirror = mlt_properties_get_position( properties, "mirror" );
391 int length = out - in + 1;
393 // Obtain the normalised width and height from the a_frame
394 int normalised_width = mlt_properties_get_int( a_props, "normalised_width" );
395 int normalised_height = mlt_properties_get_int( a_props, "normalised_height" );
397 double consumer_ar = mlt_properties_get_double( a_props, "consumer_aspect_ratio" );
398 const char *interps = mlt_properties_get( b_props, "rescale.interp" );
399 mlt_profile profile = mlt_service_profile( MLT_TRANSITION_SERVICE(this) );
401 // Structures for geometry
402 struct mlt_geometry_item_s result;
404 if ( mirror && position > length / 2 )
405 position = abs( position - length );
407 // Fetch the a frame image
408 *format = mlt_image_rgb24a;
409 mlt_frame_get_image( a_frame, image, format, width, height, 1 );
411 // Calculate the region now
412 composite_calculate( this, &result, normalised_width, normalised_height, ( float )position );
414 // Fetch the b frame image
415 result.w = ( result.w * *width / normalised_width );
416 result.h = ( result.h * *height / normalised_height );
417 result.x = ( result.x * *width / normalised_width );
418 result.y = ( result.y * *height / normalised_height );
419 b_width = mlt_properties_get_int(b_props, "real_width");
420 b_height = mlt_properties_get_int(b_props, "real_height");
421 if ( 0 && b_width > result.w * 2 && b_height > result.h * 2 )
423 // This downscale can reduce aliasing by acting as a low pass filter.
424 b_width = b_width / 2;
425 b_height = b_height / 2;
427 mlt_properties_set_int( b_props, "rescale_width", b_width );
428 mlt_properties_set_int( b_props, "rescale_height", b_height );
429 if ( mlt_properties_get_double( b_props, "aspect_ratio" ) == 0.0 )
430 mlt_properties_set_double( b_props, "aspect_ratio", consumer_ar );
431 mlt_properties_set_int( b_props, "progressive", 1 );
432 if ( interps == NULL || !strcmp( interps, "none" ) )
434 mlt_properties_set( b_props, "rescale.interp", "bilinear" );
435 mlt_properties_set_double( b_props, "consumer_aspect_ratio", consumer_ar );
437 mlt_frame_get_image( b_frame, &b_image, &b_format, &b_width, &b_height, 0 );
439 // Check that both images are of the correct format and process
440 if ( *format == mlt_image_rgb24a && b_format == mlt_image_rgb24a )
448 // Get values from the transition
449 float scale_x = mlt_properties_get_double( properties, "scale_x" );
450 float scale_y = mlt_properties_get_double( properties, "scale_y" );
451 int scale = mlt_properties_get_int( properties, "scale" );
452 float sar = (float) profile->sample_aspect_num / profile->sample_aspect_den;
453 float geom_scale_x = (float) b_width / result.w / sar;
454 float geom_scale_y = (float) b_height / result.h * sar;
455 float cx = result.x + result.w / 2.0;
456 float cy = result.y + result.h / 2.0;
457 float lower_x = - cx;
458 float upper_x = (float) *width - cx;
459 float lower_y = - cy;
460 float upper_y = (float) *height - cy;
461 float x_offset = (float) b_width / 2.0;
462 float y_offset = (float) b_height / 2.0;
463 float sar_affine[3][3];
465 interpp interp = interpBL_b32;
467 affine_init( affine.matrix );
469 // Factor aspect ratio into transforms
470 affine_init( sar_affine);
471 sar_affine[0][0] /= sar;
472 affine_multiply( affine.matrix, sar_affine );
474 // Compute the affine transform
475 get_affine( &affine, this, ( float )position );
476 dz = MapZ( affine.matrix, 0, 0 );
477 if ( ( int )abs( dz * 1000 ) < 25 )
480 // Factor scaling into the transformation based on output resolution.
481 if ( mlt_properties_get_int( properties, "distort" ) )
483 scale_x = geom_scale_x * ( scale_x == 0 ? 1 : scale_x );
484 scale_y = geom_scale_y / sar * ( scale_y == 0 ? 1 : scale_y );
488 float scaling = MIN( geom_scale_x, geom_scale_y );
489 if ( b_height / scaling > result.h / sar )
490 scaling = geom_scale_y / sar;
491 else if ( b_width / scaling > result.w * sar )
492 scaling = geom_scale_x * sar;
493 scale_x = scaling * ( scale_x == 0 ? 1 : scale_x );
494 scale_y = scaling * ( scale_y == 0 ? 1 : scale_y );
498 affine_max_output( affine.matrix, &sw, &sh, dz, profile->width, profile->height );
499 affine_scale( affine.matrix, sw * MIN( geom_scale_x, geom_scale_y ), sh * MIN( geom_scale_x, geom_scale_y ) );
501 else if ( scale_x != 0 && scale_y != 0 )
503 affine_scale( affine.matrix, scale_x, scale_y );
506 // Invert transform aspect ratio factor
507 sar_affine[0][0] *= sar; // return to identity matrix
508 sar_affine[0][0] *= sar; // reverse the sample aspect adjustment
509 affine_multiply( affine.matrix, sar_affine );
511 // Set the interpolation function
512 if ( interps == NULL || strcmp( interps, "nearest" ) == 0 || strcmp( interps, "neighbor" ) == 0 )
513 interp = interpNN_b32;
514 else if ( strcmp( interps, "tiles" ) == 0 || strcmp( interps, "fast_bilinear" ) == 0 )
515 interp = interpNN_b32;
516 else if ( strcmp( interps, "bilinear" ) == 0 )
517 interp = interpBL_b32;
518 else if ( strcmp( interps, "bicubic" ) == 0 )
519 interp = interpBC_b32;
521 else if ( strcmp( interps, "hyper" ) == 0 || strcmp( interps, "sinc" ) == 0 || strcmp( interps, "lanczos" ) == 0 )
522 interp = interpBC_b32;
523 else if ( strcmp( interps, "spline" ) == 0 ) // TODO: spline 4x4 or 6x6
524 interp = interpBC_b32;
526 // Do the transform with interpolation
527 for ( y = lower_y; y < upper_y; y ++ )
529 for ( x = lower_x; x < upper_x; x ++ )
531 dx = MapX( affine.matrix, x, y ) / dz + x_offset;
532 dy = MapY( affine.matrix, x, y ) / dz + y_offset;
533 if ( dx >= 0 && dx < b_width && dy >=0 && dy < b_height )
534 interp( b_image, b_width, b_height, dx, dy, p );
543 /** Affine transition processing.
546 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
548 // Get a unique name to store the frame position
549 char *name = mlt_properties_get( MLT_TRANSITION_PROPERTIES( transition ), "_unique_id" );
551 // Assign the current position to the name
552 mlt_properties a_props = MLT_FRAME_PROPERTIES( a_frame );
553 mlt_properties_set_position( a_props, name, mlt_frame_get_position( a_frame ) );
555 // Push the transition on to the frame
556 mlt_frame_push_service( a_frame, transition );
558 // Push the b_frame on to the stack
559 mlt_frame_push_frame( a_frame, b_frame );
561 // Push the transition method
562 mlt_frame_push_get_image( a_frame, transition_get_image );
567 /** Constructor for the filter.
570 mlt_transition transition_affine_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
572 mlt_transition transition = mlt_transition_new( );
573 if ( transition != NULL )
575 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "distort", 0 );
576 mlt_properties_set( MLT_TRANSITION_PROPERTIES( transition ), "geometry", "0,0:100%x100%" );
577 // Inform apps and framework that this is a video only transition
578 mlt_properties_set_int( MLT_TRANSITION_PROPERTIES( transition ), "_transition_type", 1 );
579 transition->process = transition_process;