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