research.m1stereo.tv/gitweb/ - melted/blob - 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 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.
  10  *
  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.
  15  *
  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.
  19  */
  20
  21 #include "transition_composite.h"
  22 #include <framework/mlt_frame.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <ctype.h>
  27 #include <string.h>
  28 #include <math.h>
  29
  30 /** Geometry struct.
  31 */
  32
  33 struct geometry_s
  34 {
  35         float position;
  36         float mix;
  37         int nw; // normalised width
  38         int nh; // normalised height
  39         int sw; // scaled width, not including consumer scale based upon w/nw
  40         int sh; // scaled height, not including consumer scale based upon h/nh
  41         float x;
  42         float y;
  43         float w;
  44         float h;
  45         int halign; // horizontal alignment: 0=left, 1=center, 2=right
  46         int valign; // vertical alignment: 0=top, 1=middle, 2=bottom
  47         int distort;
  48         struct geometry_s *next;
  49 };
  50
  51 /** Parse a value from a geometry string.
  52 */
  53
  54 static float parse_value( char **ptr, int normalisation, char delim, float defaults )
  55 {
  56         float value = defaults;
  57
  58         if ( *ptr != NULL && **ptr != '\0' )
  59         {
  60                 char *end = NULL;
  61                 value = strtod( *ptr, &end );
  62                 if ( end != NULL )
  63                 {
  64                         if ( *end == '%' )
  65                                 value = ( value / 100.0 ) * normalisation;
  66                         while ( *end == delim || *end == '%' )
  67                                 end ++;
  68                 }
  69                 *ptr = end;
  70         }
  71
  72         return value;
  73 }
  74
  75 /** Parse a geometry property string with the syntax X,Y:WxH:MIX. Any value can be
  76         expressed as a percentage by appending a % after the value, otherwise values are
  77         assumed to be relative to the normalised dimensions of the consumer.
  78 */
  79
  80 static void geometry_parse( struct geometry_s *geometry, struct geometry_s *defaults, char *property, int nw, int nh )
  81 {
  82         // Assign normalised width and height
  83         geometry->nw = nw;
  84         geometry->nh = nh;
  85
  86         // Assign from defaults if available
  87         if ( defaults != NULL )
  88         {
  89                 geometry->x = defaults->x;
  90                 geometry->y = defaults->y;
  91                 geometry->w = geometry->sw = defaults->w;
  92                 geometry->h = geometry->sh = defaults->h;
  93                 geometry->distort = defaults->distort;
  94                 geometry->mix = defaults->mix;
  95                 defaults->next = geometry;
  96         }
  97         else
  98         {
  99                 geometry->mix = 100;
 100         }
 101
 102         // Parse the geomtry string
 103         if ( property != NULL && strcmp( property, "" ) )
 104         {
 105                 char *ptr = property;
 106                 geometry->x = parse_value( &ptr, nw, ',', geometry->x );
 107                 geometry->y = parse_value( &ptr, nh, ':', geometry->y );
 108                 geometry->w = geometry->sw = parse_value( &ptr, nw, 'x', geometry->w );
 109                 geometry->h = geometry->sh = parse_value( &ptr, nh, ':', geometry->h );
 110                 if ( *ptr == '!' )
 111                 {
 112                         geometry->distort = 1;
 113                         ptr ++;
 114                         if ( *ptr == ':' )
 115                                 ptr ++;
 116                 }
 117                 geometry->mix = parse_value( &ptr, 100, ' ', geometry->mix );
 118         }
 119 }
 120
 121 /** Calculate real geometry.
 122 */
 123
 124 static void geometry_calculate( struct geometry_s *output, struct geometry_s *in, float position )
 125 {
 126         // Search in for position
 127         struct geometry_s *out = in->next;
 128
 129         if ( position >= 1.0 )
 130         {
 131                 int section = floor( position );
 132                 position -= section;
 133                 if ( section % 2 == 1 )
 134                         position = 1.0 - position;
 135         }
 136
 137         while ( out->next != NULL )
 138         {
 139                 if ( position >= in->position && position < out->position )
 140                         break;
 141
 142                 in = out;
 143                 out = in->next;
 144         }
 145
 146         position = ( position - in->position ) / ( out->position - in->position );
 147
 148         // Calculate this frames geometry
 149         output->nw = in->nw;
 150         output->nh = in->nh;
 151         output->x = in->x + ( out->x - in->x ) * position + 0.5;
 152         output->y = in->y + ( out->y - in->y ) * position + 0.5;
 153         output->w = in->w + ( out->w - in->w ) * position;
 154         output->h = in->h + ( out->h - in->h ) * position;
 155         output->mix = in->mix + ( out->mix - in->mix ) * position;
 156         output->sw = output->w;
 157         output->sh = output->h;
 158         output->distort = in->distort;
 159 }
 160
 161 void transition_destroy_keys( void *arg )
 162 {
 163         struct geometry_s *ptr = arg;
 164         struct geometry_s *next = NULL;
 165
 166         while ( ptr != NULL )
 167         {
 168                 next = ptr->next;
 169                 free( ptr );
 170                 ptr = next;
 171         }
 172 }
 173
 174 static struct geometry_s *transition_parse_keys( mlt_transition this,  int normalised_width, int normalised_height )
 175 {
 176         // Loop variable for property interrogation
 177         int i = 0;
 178
 179         // Get the properties of the transition
 180         mlt_properties properties = mlt_transition_properties( this );
 181
 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 );
 185
 186         // Create the start
 187         struct geometry_s *start = calloc( 1, sizeof( struct geometry_s ) );
 188
 189         // Create the end (we always need two entries)
 190         struct geometry_s *end = calloc( 1, sizeof( struct geometry_s ) );
 191
 192         // Pointer
 193         struct geometry_s *ptr = start;
 194
 195         // Parse the start property
 196         geometry_parse( start, NULL, mlt_properties_get( properties, "start" ), normalised_width, normalised_height );
 197
 198         // Parse the keys in between
 199         for ( i = 0; i < mlt_properties_count( properties ); i ++ )
 200         {
 201                 // Get the name of the property
 202                 char *name = mlt_properties_get_name( properties, i );
 203
 204                 // Check that it's valid
 205                 if ( !strncmp( name, "key[", 4 ) )
 206                 {
 207                         // Get the value of the property
 208                         char *value = mlt_properties_get_value( properties, i );
 209
 210                         // Determine the frame number
 211                         int frame = atoi( name + 4 );
 212
 213                         // Determine the position
 214                         float position = 0;
 215
 216                         if ( frame >= 0 && frame < ( out - in ) )
 217                                 position = ( float )frame / ( float )( out - in + 1 );
 218                         else if ( frame < 0 && - frame < ( out - in ) )
 219                                 position = ( float )( out - in + frame ) / ( float )( out - in + 1 );
 220
 221                         // For now, we'll exclude all keys received out of order
 222                         if ( position > ptr->position )
 223                         {
 224                                 // Create a new geometry
 225                                 struct geometry_s *temp = calloc( 1, sizeof( struct geometry_s ) );
 226
 227                                 // Parse and add to the list
 228                                 geometry_parse( temp, ptr, value, normalised_width, normalised_height );
 229
 230                                 // Assign the position
 231                                 temp->position = position;
 232
 233                                 // Allow the next to be appended after this one
 234                                 ptr = temp;
 235                         }
 236                         else
 237                         {
 238                                 fprintf( stderr, "Key out of order - skipping %s\n", name );
 239                         }
 240                 }
 241         }
 242
 243         // Parse the end
 244         geometry_parse( end, ptr, mlt_properties_get( properties, "end" ), normalised_width, normalised_height );
 245         if ( out > 0 )
 246                 end->position = ( float )( out - in ) / ( float )( out - in + 1 );
 247         else
 248                 end->position = 1;
 249
 250         // Assign to properties to ensure we get destroyed
 251         mlt_properties_set_data( properties, "geometries", start, 0, transition_destroy_keys, NULL );
 252
 253         return start;
 254 }
 255
 256 /** Parse the alignment properties into the geometry.
 257 */
 258
 259 static int alignment_parse( char* align )
 260 {
 261         int ret = 0;
 262
 263         if ( align == NULL );
 264         else if ( isdigit( align[ 0 ] ) )
 265                 ret = atoi( align );
 266         else if ( align[ 0 ] == 'c' || align[ 0 ] == 'm' )
 267                 ret = 1;
 268         else if ( align[ 0 ] == 'r' || align[ 0 ] == 'b' )
 269                 ret = 2;
 270
 271         return ret;
 272 }
 273
 274 /** Adjust position according to scaled size and alignment properties.
 275 */
 276
 277 static void alignment_calculate( struct geometry_s *geometry )
 278 {
 279         geometry->x += ( geometry->w - geometry->sw ) * geometry->halign / 2 + 0.5;
 280         geometry->y += ( geometry->h - geometry->sh ) * geometry->valign / 2 + 0.5;
 281 }
 282
 283 /** Calculate the position for this frame.
 284 */
 285
 286 static inline float position_calculate( mlt_transition this, mlt_frame frame )
 287 {
 288         // Get the in and out position
 289         mlt_position in = mlt_transition_get_in( this );
 290         mlt_position out = mlt_transition_get_out( this );
 291
 292         // Get the position
 293         mlt_position position = mlt_frame_get_position( frame );
 294
 295         // Now do the calcs
 296         return ( float )( position - in ) / ( float )( out - in + 1 );
 297 }
 298
 299 /** Calculate the field delta for this frame - position between two frames.
 300 */
 301
 302 static inline float delta_calculate( mlt_transition this, mlt_frame frame )
 303 {
 304         // Get the in and out position
 305         mlt_position in = mlt_transition_get_in( this );
 306         mlt_position out = mlt_transition_get_out( this );
 307
 308         // Get the position of the frame
 309         mlt_position position = mlt_frame_get_position( frame );
 310
 311         // Now do the calcs
 312         float x = ( float )( position - in ) / ( float )( out - in + 1 );
 313         float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
 314
 315         return ( y - x ) / 2.0;
 316 }
 317
 318 static int get_value( mlt_properties properties, char *preferred, char *fallback )
 319 {
 320         int value = mlt_properties_get_int( properties, preferred );
 321         if ( value == 0 )
 322                 value = mlt_properties_get_int( properties, fallback );
 323         return value;
 324 }
 325
 326 /** Composite function.
 327 */
 328
 329 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 )
 330 {
 331         int ret = 0;
 332         int i, j;
 333         int x_src = 0, y_src = 0;
 334         int32_t weight = ( 1 << 16 ) * ( geometry.mix / 100 );
 335         int stride_src = width_src * bpp;
 336         int stride_dest = width_dest * bpp;
 337
 338         // Adjust to consumer scale
 339         int x = geometry.x * width_dest / geometry.nw + 0.5;
 340         int y = geometry.y * height_dest / geometry.nh + 0.5;
 341
 342         if ( bpp == 2 )
 343                 x -= x % 2;
 344
 345         // optimization points - no work to do
 346         if ( width_src <= 0 || height_src <= 0 )
 347                 return ret;
 348
 349         if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
 350                 return ret;
 351
 352         // crop overlay off the left edge of frame
 353         if ( x < 0 )
 354         {
 355                 x_src = -x;
 356                 width_src -= x_src;
 357                 x = 0;
 358         }
 359
 360         // crop overlay beyond right edge of frame
 361         else if ( x + width_src > width_dest )
 362                 width_src = width_dest - x;
 363
 364         // crop overlay off the top edge of the frame
 365         if ( y < 0 )
 366         {
 367                 y_src = -y;
 368                 height_src -= y_src;
 369         }
 370         // crop overlay below bottom edge of frame
 371         else if ( y + height_src > height_dest )
 372                 height_src = height_dest - y;
 373
 374         // offset pointer into overlay buffer based on cropping
 375         p_src += x_src * bpp + y_src * stride_src;
 376
 377         // offset pointer into frame buffer based upon positive coordinates only!
 378         p_dest += ( x < 0 ? 0 : x ) * bpp + ( y < 0 ? 0 : y ) * stride_dest;
 379
 380         // offset pointer into alpha channel based upon cropping
 381         if ( p_alpha )
 382                 p_alpha += x_src + y_src * stride_src / bpp;
 383
 384         // Assuming lower field first
 385         // Special care is taken to make sure the b_frame is aligned to the correct field.
 386         // field 0 = lower field and y should be odd (y is 0-based).
 387         // field 1 = upper field and y should be even.
 388         if ( ( field > -1 ) && ( y % 2 == field ) )
 389         {
 390                 //fprintf( stderr, "field %d y %d\n", field, y );
 391                 if ( ( field == 1 && y < height_dest - 1 ) || ( field == 0 && y == 0 ) )
 392                         p_dest += stride_dest;
 393                 else
 394                         p_dest -= stride_dest;
 395         }
 396
 397         // On the second field, use the other lines from b_frame
 398         if ( field == 1 )
 399         {
 400                 p_src += stride_src;
 401                 if ( p_alpha )
 402                         p_alpha += stride_src / bpp;
 403                 height_src--;
 404         }
 405
 406         uint8_t *p = p_src;
 407         uint8_t *q = p_dest;
 408         uint8_t *o = p_dest;
 409         uint8_t *z = p_alpha;
 410
 411         uint8_t a;
 412         int32_t value;
 413         int step = ( field > -1 ) ? 2 : 1;
 414
 415         stride_src = stride_src * step;
 416         int alpha_stride = stride_src / bpp;
 417         stride_dest = stride_dest * step;
 418
 419         // now do the compositing only to cropped extents
 420         for ( i = 0; i < height_src; i += step )
 421         {
 422                 p = p_src;
 423                 q = p_dest;
 424                 o = q;
 425                 z = p_alpha;
 426
 427                 for ( j = 0; j < width_src; j ++ )
 428                 {
 429                         a = ( z == NULL ) ? 255 : *z ++;
 430                         value = ( weight * ( a + 1 ) ) >> 8;
 431                         *o ++ = ( *p++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 432                         *o ++ = ( *p++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 433                 }
 434
 435                 p_src += stride_src;
 436                 p_dest += stride_dest;
 437                 if ( p_alpha )
 438                         p_alpha += alpha_stride;
 439         }
 440
 441         return ret;
 442 }
 443
 444
 445 /** Get the properly sized image from b_frame.
 446 */
 447
 448 static int get_b_frame_image( mlt_transition this, mlt_frame b_frame, uint8_t **image, int *width, int *height, struct geometry_s *geometry )
 449 {
 450         int ret = 0;
 451         mlt_image_format format = mlt_image_yuv422;
 452
 453         // Get the properties objects
 454         mlt_properties b_props = mlt_frame_properties( b_frame );
 455         mlt_properties properties = mlt_transition_properties( this );
 456
 457         if ( mlt_properties_get( properties, "distort" ) == NULL && geometry->distort == 0 )
 458         {
 459                 // Adjust b_frame pixel aspect
 460                 int normalised_width = geometry->w;
 461                 int normalised_height = geometry->h;
 462                 int real_width = get_value( b_props, "real_width", "width" );
 463                 int real_height = get_value( b_props, "real_height", "height" );
 464                 double input_ar = mlt_frame_get_aspect_ratio( b_frame );
 465                 double output_ar = mlt_properties_get_double( b_props, "consumer_aspect_ratio" );
 466                 int scaled_width = real_width;
 467                 int scaled_height = real_height;
 468                 double output_sar = ( double ) geometry->nw / geometry->nh / output_ar;
 469
 470                 // If the output is fat pixels (NTSC) then stretch our input horizontally
 471                 // derived from: output_sar / input_sar * real_width
 472                 scaled_width = output_sar * real_height * input_ar;
 473
 474                 // Now ensure that our images fit in the normalised frame
 475                 if ( scaled_width > normalised_width )
 476                 {
 477                         scaled_height = scaled_height * normalised_width / scaled_width;
 478                         scaled_width = normalised_width;
 479                 }
 480                 if ( scaled_height > normalised_height )
 481                 {
 482                         scaled_width = scaled_width * normalised_height / scaled_height;
 483                         scaled_height = normalised_height;
 484                 }
 485
 486                 // Now apply the fill
 487                 // TODO: Should combine fill/distort in one property
 488                 if ( mlt_properties_get( properties, "fill" ) != NULL )
 489                 {
 490                         scaled_width = ( geometry->w / scaled_width ) * scaled_width;
 491                         scaled_height = ( geometry->h / scaled_height ) * scaled_height;
 492                 }
 493
 494                 // Save the new scaled dimensions
 495                 geometry->sw = scaled_width;
 496                 geometry->sh = scaled_height;
 497         }
 498
 499         // We want to ensure that we bypass resize now...
 500         mlt_properties_set( b_props, "distort", "true" );
 501
 502         // Take into consideration alignment for optimisation
 503         alignment_calculate( geometry );
 504
 505         // Adjust to consumer scale
 506         int x = geometry->x * *width / geometry->nw + 0.5;
 507         int y = geometry->y * *height / geometry->nh + 0.5;
 508         *width = geometry->sw * *width / geometry->nw;
 509         *height = geometry->sh * *height / geometry->nh;
 510
 511         x -= x % 2;
 512
 513         // optimization points - no work to do
 514         if ( *width <= 0 || *height <= 0 )
 515                 return 1;
 516
 517         if ( ( x < 0 && -x >= *width ) || ( y < 0 && -y >= *height ) )
 518                 return 1;
 519
 520         ret = mlt_frame_get_image( b_frame, image, &format, width, height, 1 );
 521
 522         return ret;
 523 }
 524
 525
 526 static uint8_t *transition_get_alpha_mask( mlt_frame this )
 527 {
 528         // Obtain properties of frame
 529         mlt_properties properties = mlt_frame_properties( this );
 530
 531         // Return the alpha mask
 532         return mlt_properties_get_data( properties, "alpha", NULL );
 533 }
 534
 535 /** Get the image.
 536 */
 537
 538 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 539 {
 540         // Get the b frame from the stack
 541         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
 542
 543         // This compositer is yuv422 only
 544         *format = mlt_image_yuv422;
 545
 546         // Get the transition from the a frame
 547         mlt_transition this = mlt_frame_pop_service( a_frame );
 548
 549         // Get the image from the a frame
 550         mlt_frame_get_image( a_frame, image, format, width, height, 1 );
 551
 552         if ( b_frame != NULL )
 553         {
 554                 // Get the properties of the a frame
 555                 mlt_properties a_props = mlt_frame_properties( a_frame );
 556
 557                 // Get the properties of the b frame
 558                 mlt_properties b_props = mlt_frame_properties( b_frame );
 559
 560                 // Get the properties from the transition
 561                 mlt_properties properties = mlt_transition_properties( this );
 562
 563                 // Structures for geometry
 564                 struct geometry_s result;
 565                 struct geometry_s *start = mlt_properties_get_data( properties, "geometries", NULL );
 566
 567                 // Calculate the position
 568                 float position = mlt_properties_get_double( b_props, "relative_position" );
 569                 float delta = delta_calculate( this, a_frame );
 570
 571                 // Now parse the geometries
 572                 if ( start == NULL )
 573                 {
 574                         // Obtain the normalised width and height from the a_frame
 575                         int normalised_width = mlt_properties_get_int( a_props, "normalised_width" );
 576                         int normalised_height = mlt_properties_get_int( a_props, "normalised_height" );
 577
 578                         // Parse the transitions properties
 579                         start = transition_parse_keys( this, normalised_width, normalised_height );
 580                 }
 581
 582                 // Since we are the consumer of the b_frame, we must pass along these
 583                 // consumer properties from the a_frame
 584                 mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 585                 mlt_properties_set_double( b_props, "consumer_scale", mlt_properties_get_double( a_props, "consumer_scale" ) );
 586
 587                 // Do the calculation
 588                 geometry_calculate( &result, start, position );
 589
 590                 // Now parse the alignment
 591                 result.halign = alignment_parse( mlt_properties_get( properties, "halign" ) );
 592                 result.valign = alignment_parse( mlt_properties_get( properties, "valign" ) );
 593
 594                 // Get the image from the b frame
 595                 uint8_t *image_b = NULL;
 596                 int width_b = *width;
 597                 int height_b = *height;
 598
 599                 if ( get_b_frame_image( this, b_frame, &image_b, &width_b, &height_b, &result ) == 0 )
 600                 {
 601                         uint8_t *dest = *image;
 602                         uint8_t *src = image_b;
 603                         int bpp = 2;
 604                         uint8_t *alpha = mlt_frame_get_alpha_mask( b_frame );
 605                         int progressive = mlt_properties_get_int( a_props, "progressive" ) ||
 606                                         mlt_properties_get_int( a_props, "consumer_progressive" ) ||
 607                                         mlt_properties_get_int( properties, "progressive" );
 608                         int field;
 609
 610                         for ( field = 0; field < ( progressive ? 1 : 2 ); field++ )
 611                         {
 612                                 // Assume lower field (0) first
 613                                 float field_position = position + field * delta;
 614
 615                                 // Do the calculation if we need to
 616                                 geometry_calculate( &result, start, field_position );
 617
 618                                 // Align
 619                                 alignment_calculate( &result );
 620
 621                                 // Composite the b_frame on the a_frame
 622                                 composite_yuv( dest, *width, *height, bpp, src, width_b, height_b, alpha, result, progressive ? -1 : field );
 623                         }
 624                 }
 625         }
 626
 627         return 0;
 628 }
 629
 630 /** Composition transition processing.
 631 */
 632
 633 static mlt_frame composite_process( mlt_transition this, mlt_frame a_frame, mlt_frame b_frame )
 634 {
 635         // Propogate the transition properties to the b frame
 636         mlt_properties_set_double( mlt_frame_properties( b_frame ), "relative_position", position_calculate( this, a_frame ) );
 637         mlt_frame_push_service( a_frame, this );
 638         mlt_frame_push_get_image( a_frame, transition_get_image );
 639         mlt_frame_push_frame( a_frame, b_frame );
 640         return a_frame;
 641 }
 642
 643 /** Constructor for the filter.
 644 */
 645
 646 mlt_transition transition_composite_init( char *arg )
 647 {
 648         mlt_transition this = calloc( sizeof( struct mlt_transition_s ), 1 );
 649         if ( this != NULL && mlt_transition_init( this, NULL ) == 0 )
 650         {
 651                 this->process = composite_process;
 652                 mlt_properties_set( mlt_transition_properties( this ), "start", arg != NULL ? arg : "85%,5%:10%x10%" );
 653         }
 654         return this;
 655 }
 656