research.m1stereo.tv/gitweb/ - melted/blob - src/modules/core/transition_luma.c

   1 /*
   2  * transition_luma.c -- a generic dissolve/wipe processor
   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_luma.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
  29 /** Luma class.
  30 */
  31
  32 typedef struct
  33 {
  34         struct mlt_transition_s parent;
  35         char *filename;
  36         int width;
  37         int height;
  38         float *bitmap;
  39 }
  40 transition_luma;
  41
  42
  43 // forward declarations
  44 static void transition_close( mlt_transition parent );
  45
  46
  47 // image processing functions
  48
  49 static inline float smoothstep( float edge1, float edge2, float a )
  50 {
  51         if ( a < edge1 )
  52                 return 0.0;
  53
  54         if ( a >= edge2 )
  55                 return 1.0;
  56
  57         a = ( a - edge1 ) / ( edge2 - edge1 );
  58
  59         return ( a * a * ( 3 - 2 * a ) );
  60 }
  61
  62 /** Calculate the position for this frame.
  63 */
  64
  65 static float position_calculate( mlt_transition this, mlt_frame frame )
  66 {
  67         // Get the in and out position
  68         mlt_position in = mlt_transition_get_in( this );
  69         mlt_position out = mlt_transition_get_out( this );
  70
  71         // Get the position of the frame
  72         mlt_position position = mlt_frame_get_position( frame );
  73
  74         // Now do the calcs
  75         return ( float )( position - in ) / ( float )( out - in + 1 );
  76 }
  77
  78 /** Calculate the field delta for this frame - position between two frames.
  79 */
  80
  81 static float delta_calculate( mlt_transition this, mlt_frame frame )
  82 {
  83         // Get the in and out position
  84         mlt_position in = mlt_transition_get_in( this );
  85         mlt_position out = mlt_transition_get_out( this );
  86
  87         // Get the position of the frame
  88         mlt_position position = mlt_frame_get_position( frame );
  89
  90         // Now do the calcs
  91         float x = ( float )( position - in ) / ( float )( out - in + 1 );
  92         position++;
  93         float y = ( float )( position - in ) / ( float )( out - in + 1 );
  94
  95         return ( y - x ) / 2.0;
  96 }
  97
  98 static int frame_composite_yuv( mlt_frame this, mlt_frame that, int x, int y, float weight, int *width, int *height )
  99 {
 100         int ret = 0;
 101         int width_src = *width, height_src = *height;
 102         int width_dest = *width, height_dest = *height;
 103         mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
 104         uint8_t *p_src, *p_dest;
 105         int i, j;
 106         int stride_src;
 107         int stride_dest;
 108         int x_src = 0, y_src = 0;
 109
 110         // optimization point - no work to do
 111         if ( ( x < 0 && -x >= width_src ) || ( y < 0 && -y >= height_src ) )
 112                 return ret;
 113
 114         format_src = mlt_image_yuv422;
 115         format_dest = mlt_image_yuv422;
 116
 117         mlt_frame_get_image( this, &p_dest, &format_dest, &width_dest, &height_dest, 1 /* writable */ );
 118         mlt_frame_get_image( that, &p_src, &format_src, &width_src, &height_src, 0 /* writable */ );
 119
 120         stride_src = width_src * 2;
 121         stride_dest = width_dest * 2;
 122
 123         // crop overlay off the left edge of frame
 124         if ( x < 0 )
 125         {
 126                 x_src = -x;
 127                 width_src -= x_src;
 128                 x = 0;
 129         }
 130
 131         // crop overlay beyond right edge of frame
 132         else if ( x + width_src > width_dest )
 133                 width_src = width_dest - x;
 134
 135         // crop overlay off the top edge of the frame
 136         if ( y < 0 )
 137         {
 138                 y_src = -y;
 139                 height_src -= y_src;
 140         }
 141         // crop overlay below bottom edge of frame
 142         else if ( y + height_src > height_dest )
 143                 height_src = height_dest - y;
 144
 145         // offset pointer into overlay buffer based on cropping
 146         p_src += x_src * 2 + y_src * stride_src;
 147
 148         // offset pointer into frame buffer based upon positive, even coordinates only!
 149         p_dest += ( x < 0 ? 0 : x ) * 2 + ( y < 0 ? 0 : y ) * stride_dest;
 150
 151         // Get the alpha channel of the overlay
 152         uint8_t *p_alpha = mlt_frame_get_alpha_mask( that );
 153
 154         // offset pointer into alpha channel based upon cropping
 155         if ( p_alpha )
 156                 p_alpha += x_src + y_src * stride_src / 2;
 157
 158         uint8_t *p = p_src;
 159         uint8_t *q = p_dest;
 160         uint8_t *o = p_dest;
 161         uint8_t *z = p_alpha;
 162
 163         uint8_t Y;
 164         uint8_t UV;
 165         uint8_t a;
 166         float value;
 167
 168         // now do the compositing only to cropped extents
 169         for ( i = 0; i < height_src; i++ )
 170         {
 171                 p = p_src;
 172                 q = p_dest;
 173                 o = p_dest;
 174                 z = p_alpha;
 175
 176                 for ( j = 0; j < width_src; j ++ )
 177                 {
 178                         Y = *p ++;
 179                         UV = *p ++;
 180                         a = ( z == NULL ) ? 255 : *z ++;
 181                         value = ( weight * ( float ) a / 255.0 );
 182                         *o ++ = (uint8_t)( Y * value + *q++ * ( 1 - value ) );
 183                         *o ++ = (uint8_t)( UV * value + *q++ * ( 1 - value ) );
 184                 }
 185
 186                 p_src += stride_src;
 187                 p_dest += stride_dest;
 188                 if ( p_alpha )
 189                         p_alpha += stride_src / 2;
 190         }
 191
 192         return ret;
 193 }
 194
 195 /** powerful stuff
 196
 197     \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
 198 */
 199 static void luma_composite( mlt_frame a_frame, mlt_frame b_frame, int luma_width, int luma_height,
 200                                                         float *luma_bitmap, float pos, float frame_delta, float softness, int field_order,
 201                                                         int *width, int *height )
 202 {
 203         int width_src = *width, height_src = *height;
 204         int width_dest = *width, height_dest = *height;
 205         mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
 206         uint8_t *p_src, *p_dest;
 207         int i, j;
 208         int stride_src;
 209         int stride_dest;
 210         float weight = 0;
 211         int field;
 212
 213         format_src = mlt_image_yuv422;
 214         format_dest = mlt_image_yuv422;
 215
 216         mlt_frame_get_image( a_frame, &p_dest, &format_dest, &width_dest, &height_dest, 1 /* writable */ );
 217         mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 /* writable */ );
 218
 219         stride_src = width_src * 2;
 220         stride_dest = width_dest * 2;
 221
 222         // Offset the position based on which field we're looking at ...
 223         float field_pos[ 2 ];
 224         field_pos[ 0 ] = pos + ( ( field_order == 0 ? 1 : 0 ) * frame_delta * 0.5 );
 225         field_pos[ 1 ] = pos + ( ( field_order == 0 ? 0 : 1 ) * frame_delta * 0.5 );
 226
 227         // adjust the position for the softness level
 228         field_pos[ 0 ] *= ( 1.0 + softness );
 229         field_pos[ 1 ] *= ( 1.0 + softness );
 230
 231         uint8_t *p;
 232         uint8_t *q;
 233         uint8_t *o;
 234         float  *l;
 235
 236         uint8_t y;
 237         uint8_t uv;
 238         float value;
 239
 240         float x_diff = ( float )luma_width / ( float )*width;
 241         float y_diff = ( float )luma_height / ( float )*height;
 242
 243         // composite using luma map
 244         for ( field = 0; field < ( field_order < 0 ? 1 : 2 ); ++field )
 245         {
 246                 for ( i = field; i < height_src; i += ( field_order < 0 ? 1 : 2 ) )
 247                 {
 248                         p = &p_src[ i * stride_src ];
 249                         q = &p_dest[ i * stride_dest ];
 250                         o = &p_dest[ i * stride_dest ];
 251                         l = &luma_bitmap[ ( int )( ( float )i * y_diff ) * luma_width ];
 252
 253                         for ( j = 0; j < width_src; j ++ )
 254                         {
 255                                 y = *p ++;
 256                                 uv = *p ++;
 257                 weight = l[ ( int )( ( float )j * x_diff ) ];
 258                                 value = smoothstep( weight, weight + softness, field_pos[ field ] );
 259
 260                                 *o ++ = (uint8_t)( y * value + *q++ * ( 1 - value ) );
 261                                 *o ++ = (uint8_t)( uv * value + *q++ * ( 1 - value ) );
 262                         }
 263                 }
 264         }
 265 }
 266
 267 /** Get the image.
 268 */
 269
 270 static int transition_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 271 {
 272         // Get the properties of the a frame
 273         mlt_properties a_props = mlt_frame_properties( this );
 274
 275         // Get the b frame from the stack
 276         mlt_frame b_frame = mlt_frame_pop_frame( this );
 277
 278         // Get the properties of the b frame
 279         mlt_properties b_props = mlt_frame_properties( b_frame );
 280
 281         // Arbitrary composite defaults
 282         float mix = mlt_properties_get_double( b_props, "image.mix" );
 283         float frame_delta = mlt_properties_get_double( b_props, "luma.delta" );
 284         int luma_width = mlt_properties_get_int( b_props, "luma.width" );
 285         int luma_height = mlt_properties_get_int( b_props, "luma.height" );
 286         float *luma_bitmap = mlt_properties_get_data( b_props, "luma.bitmap", NULL );
 287         float luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
 288         int progressive = mlt_properties_get_int( b_props, "progressive" ) ||
 289                         mlt_properties_get_int( a_props, "consumer_progressive" ) ||
 290                         mlt_properties_get_int( b_props, "luma.progressive" );
 291
 292         int top_field_first =  mlt_properties_get_int( b_props, "top_field_first" );
 293         int reverse = mlt_properties_get_int( b_props, "luma.reverse" );
 294
 295         // Since we are the consumer of the b_frame, we must pass along this
 296         // consumer property from the a_frame
 297         mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 298         mlt_properties_set_double( b_props, "consumer_scale", mlt_properties_get_double( a_props, "consumer_scale" ) );
 299
 300         // Honour the reverse here
 301         mix = reverse ? 1 - mix : mix;
 302         frame_delta *= reverse ? -1.0 : 1.0;
 303
 304         // Ensure we get scaling on the b_frame
 305         mlt_properties_set( b_props, "rescale.interp", "nearest" );
 306
 307         if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
 308                 // Composite the frames using a luma map
 309                 luma_composite( this, b_frame, luma_width, luma_height, luma_bitmap, mix, frame_delta,
 310                         luma_softness, progressive ? -1 : top_field_first, width, height );
 311         else
 312                 // Dissolve the frames using the time offset for mix value
 313                 frame_composite_yuv( this, b_frame, 0, 0, mix, width, height );
 314
 315         // Extract the a_frame image info
 316         *width = mlt_properties_get_int( a_props, "width" );
 317         *height = mlt_properties_get_int( a_props, "height" );
 318         *image = mlt_properties_get_data( a_props, "image", NULL );
 319
 320         return 0;
 321 }
 322
 323 /** Load the luma map from PGM stream.
 324 */
 325
 326 static void luma_read_pgm( FILE *f, float **map, int *width, int *height )
 327 {
 328         uint8_t *data = NULL;
 329         while (1)
 330         {
 331                 char line[128];
 332                 int i = 2;
 333                 int maxval;
 334                 int bpp;
 335                 float *p;
 336
 337                 line[127] = '\0';
 338
 339                 // get the magic code
 340                 if ( fgets( line, 127, f ) == NULL )
 341                         break;
 342                 if ( line[0] != 'P' || line[1] != '5' )
 343                         break;
 344
 345                 // skip white space and see if a new line must be fetched
 346                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 347                 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
 348                         break;
 349
 350                 // get the dimensions
 351                 if ( line[0] == 'P' )
 352                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 353                 else
 354                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 355
 356                 // get the height value, if not yet
 357                 if ( i < 2 )
 358                 {
 359                         if ( fgets( line, 127, f ) == NULL )
 360                                 break;
 361                         i = sscanf( line, "%d", height );
 362                         if ( i == 0 )
 363                                 break;
 364                         else
 365                                 i = 2;
 366                 }
 367
 368                 // get the maximum gray value, if not yet
 369                 if ( i < 3 )
 370                 {
 371                         if ( fgets( line, 127, f ) == NULL )
 372                                 break;
 373                         i = sscanf( line, "%d", &maxval );
 374                         if ( i == 0 )
 375                                 break;
 376                 }
 377
 378                 // determine if this is one or two bytes per pixel
 379                 bpp = maxval > 255 ? 2 : 1;
 380
 381                 // allocate temporary storage for the raw data
 382                 // IRRIGATE ME
 383                 data = malloc( *width * *height * bpp );
 384                 if ( data == NULL )
 385                         break;
 386
 387                 // read the raw data
 388                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 389                         break;
 390
 391                 // allocate the luma bitmap
 392                 // IRRIGATE ME
 393                 *map =  p = (float*) malloc( *width * *height * sizeof( float ) );
 394                 if ( *map == NULL )
 395                         break;
 396
 397                 // proces the raw data into the luma bitmap
 398                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 399                 {
 400                         if ( bpp == 1 )
 401                                 *p++ = (float) data[ i ] / (float) maxval;
 402                         else
 403                                 *p++ = (float) ( ( data[ i ] << 8 ) + data[ i+1 ] ) / (float) maxval;
 404                 }
 405
 406                 break;
 407         }
 408
 409         if ( data != NULL )
 410                 free( data );
 411 }
 412
 413
 414 /** Luma transition processing.
 415 */
 416
 417 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 418 {
 419         transition_luma *this = (transition_luma*) transition->child;
 420
 421         // Get the properties of the transition
 422         mlt_properties properties = mlt_transition_properties( transition );
 423
 424         // Get the properties of the b frame
 425         mlt_properties b_props = mlt_frame_properties( b_frame );
 426
 427         // If the filename property changed, reload the map
 428         char *luma_file = mlt_properties_get( properties, "resource" );
 429         if ( luma_file != NULL && ( this->filename == NULL || ( this->filename && strcmp( luma_file, this->filename ) ) ) )
 430         {
 431                 FILE *pipe;
 432
 433                 free( this->filename );
 434                 this->filename = strdup( luma_file );
 435                 pipe = fopen( luma_file, "r" );
 436                 if ( pipe != NULL )
 437                 {
 438                         free( this->bitmap );
 439                         luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
 440                         fclose( pipe );
 441                 }
 442         }
 443
 444         // Set the b frame properties
 445         mlt_properties_set_double( b_props, "image.mix", position_calculate( transition, b_frame ) );
 446         mlt_properties_set_double( b_props, "luma.delta", delta_calculate( transition, b_frame ) );
 447         mlt_properties_set_int( b_props, "luma.width", this->width );
 448         mlt_properties_set_int( b_props, "luma.height", this->height );
 449         mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
 450         mlt_properties_set_int( b_props, "luma.reverse", mlt_properties_get_int( properties, "reverse" ) );
 451         mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
 452
 453         mlt_frame_push_get_image( a_frame, transition_get_image );
 454         mlt_frame_push_frame( a_frame, b_frame );
 455
 456         return a_frame;
 457 }
 458
 459 /** Constructor for the filter.
 460 */
 461
 462 mlt_transition transition_luma_init( char *lumafile )
 463 {
 464         transition_luma *this = calloc( sizeof( transition_luma ), 1 );
 465         if ( this != NULL )
 466         {
 467                 mlt_transition transition = &this->parent;
 468                 mlt_transition_init( transition, this );
 469                 transition->process = transition_process;
 470                 transition->close = transition_close;
 471                 mlt_properties_set( mlt_transition_properties( transition ), "resource", lumafile );
 472                 return &this->parent;
 473         }
 474         return NULL;
 475 }
 476
 477 /** Close the transition.
 478 */
 479
 480 static void transition_close( mlt_transition parent )
 481 {
 482         transition_luma *this = (transition_luma*) parent->child;
 483         free( this->bitmap );
 484         free( this->filename );
 485         free( this );
 486 }
 487