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