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         int width;
  36         int height;
  37         uint16_t *bitmap;
  38 }
  39 transition_luma;
  40
  41
  42 // forward declarations
  43 static void transition_close( mlt_transition parent );
  44
  45 /** Calculate the position for this frame.
  46 */
  47
  48 static float position_calculate( mlt_transition this, mlt_frame frame )
  49 {
  50         // Get the in and out position
  51         mlt_position in = mlt_transition_get_in( this );
  52         mlt_position out = mlt_transition_get_out( this );
  53
  54         // Get the position of the frame
  55         mlt_position position = mlt_frame_get_position( frame );
  56
  57         // Now do the calcs
  58         return ( float )( position - in ) / ( float )( out - in + 1 );
  59 }
  60
  61 /** Calculate the field delta for this frame - position between two frames.
  62 */
  63
  64 static float delta_calculate( mlt_transition this, mlt_frame frame )
  65 {
  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 );
  69
  70         // Get the position of the frame
  71         mlt_position position = mlt_frame_get_position( frame );
  72
  73         // Now do the calcs
  74         float x = ( float )( position - in ) / ( float )( out - in + 1 );
  75         float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
  76
  77         return ( y - x ) / 2.0;
  78 }
  79
  80 static inline int dissolve_yuv( mlt_frame this, mlt_frame that, float weight, int width, int height )
  81 {
  82         int ret = 0;
  83         int width_src = width, height_src = height;
  84         mlt_image_format format = mlt_image_yuv422;
  85         uint8_t *p_src, *p_dest;
  86         uint8_t *p;
  87         uint8_t *limit;
  88
  89         int32_t weigh = weight * ( 1 << 16 );
  90         int32_t weigh_complement = ( 1 - weight ) * ( 1 << 16 );
  91
  92         mlt_frame_get_image( this, &p_dest, &format, &width, &height, 1 );
  93         mlt_frame_get_image( that, &p_src, &format, &width_src, &height_src, 0 );
  94
  95         p = p_dest;
  96         limit = p_dest + height_src * width_src * 2;
  97
  98         while ( p < limit )
  99         {
 100                 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
 101                 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
 102         }
 103
 104         return ret;
 105 }
 106
 107 // image processing functions
 108
 109 static inline uint32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
 110 {
 111         if ( a < edge1 )
 112                 return 0;
 113
 114         if ( a >= edge2 )
 115                 return 0x10000;
 116
 117         a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
 118
 119         return ( ( ( a * a ) >> 16 )  * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
 120 }
 121
 122 /** powerful stuff
 123
 124     \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
 125 */
 126 static void luma_composite( mlt_frame a_frame, mlt_frame b_frame, int luma_width, int luma_height,
 127                                                         uint16_t *luma_bitmap, float pos, float frame_delta, float softness, int field_order,
 128                                                         int *width, int *height )
 129 {
 130         int width_src = *width, height_src = *height;
 131         int width_dest = *width, height_dest = *height;
 132         mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
 133         uint8_t *p_src, *p_dest;
 134         int i, j;
 135         int stride_src;
 136         int stride_dest;
 137         uint16_t weight = 0;
 138
 139         format_src = mlt_image_yuv422;
 140         format_dest = mlt_image_yuv422;
 141
 142         mlt_frame_get_image( a_frame, &p_dest, &format_dest, &width_dest, &height_dest, 1 );
 143         mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 );
 144
 145         stride_src = width_src * 2;
 146         stride_dest = width_dest * 2;
 147
 148         // Offset the position based on which field we're looking at ...
 149         int32_t field_pos[ 2 ];
 150         field_pos[ 0 ] = ( pos + ( ( field_order == 0 ? 1 : 0 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
 151         field_pos[ 1 ] = ( pos + ( ( field_order == 0 ? 0 : 1 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
 152
 153         register uint8_t *p;
 154         register uint8_t *q;
 155         register uint8_t *o;
 156         uint16_t  *l;
 157
 158         uint32_t value;
 159
 160         int32_t x_diff = ( luma_width << 16 ) / *width;
 161         int32_t y_diff = ( luma_height << 16 ) / *height;
 162         int32_t x_offset = 0;
 163         int32_t y_offset = 0;
 164         uint8_t *p_row;
 165         uint8_t *q_row;
 166
 167         int32_t i_softness = softness * ( 1 << 16 );
 168
 169         int field_count = field_order <= 0 ? 1 : 2;
 170         int field_stride_src = field_count * stride_src;
 171         int field_stride_dest = field_count * stride_dest;
 172
 173         int field = 0;
 174
 175         // composite using luma map
 176         while ( field < field_count )
 177         {
 178                 p_row = p_src + field * stride_src;
 179                 q_row = p_dest + field * stride_dest;
 180                 y_offset = ( field * luma_width ) << 16;
 181                 i = field;
 182
 183                 while ( i < height_src )
 184                 {
 185                         p = p_row;
 186                         q = q_row;
 187                         o = q;
 188                         l = luma_bitmap + ( y_offset >> 16 ) * ( luma_width * field_count );
 189                         x_offset = 0;
 190                         j = width_src;
 191
 192                         while( j -- )
 193                         {
 194                 weight = l[ x_offset >> 16 ];
 195                                 value = smoothstep( weight, i_softness + weight, field_pos[ field ] );
 196                                 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 197                                 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 198                                 x_offset += x_diff;
 199                         }
 200
 201                         y_offset += y_diff;
 202                         i += field_count;
 203                         p_row += field_stride_src;
 204                         q_row += field_stride_dest;
 205                 }
 206
 207                 field ++;
 208         }
 209 }
 210
 211 /** Get the image.
 212 */
 213
 214 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 215 {
 216         // Get the properties of the a frame
 217         mlt_properties a_props = mlt_frame_properties( a_frame );
 218
 219         // Get the b frame from the stack
 220         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
 221
 222         // Get the properties of the b frame
 223         mlt_properties b_props = mlt_frame_properties( b_frame );
 224
 225         // Arbitrary composite defaults
 226         float mix = mlt_properties_get_double( b_props, "image.mix" );
 227         float frame_delta = mlt_properties_get_double( b_props, "luma.delta" );
 228         int luma_width = mlt_properties_get_int( b_props, "luma.width" );
 229         int luma_height = mlt_properties_get_int( b_props, "luma.height" );
 230         uint16_t *luma_bitmap = mlt_properties_get_data( b_props, "luma.bitmap", NULL );
 231         float luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
 232         int progressive = mlt_properties_get_int( b_props, "progressive" ) ||
 233                         mlt_properties_get_int( a_props, "consumer_progressive" ) ||
 234                         mlt_properties_get_int( b_props, "luma.progressive" );
 235
 236         int top_field_first =  mlt_properties_get_int( b_props, "top_field_first" );
 237         int reverse = mlt_properties_get_int( b_props, "luma.reverse" );
 238
 239         // Since we are the consumer of the b_frame, we must pass along this
 240         // consumer property from the a_frame
 241         mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 242         mlt_properties_set_double( b_props, "consumer_scale", mlt_properties_get_double( a_props, "consumer_scale" ) );
 243
 244         // Honour the reverse here
 245         mix = reverse ? 1 - mix : mix;
 246         frame_delta *= reverse ? -1.0 : 1.0;
 247
 248         // Ensure we get scaling on the b_frame
 249         mlt_properties_set( b_props, "rescale.interp", "nearest" );
 250
 251         if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
 252                 // Composite the frames using a luma map
 253                 luma_composite( a_frame, b_frame, luma_width, luma_height, luma_bitmap, mix, frame_delta,
 254                         luma_softness, progressive ? -1 : top_field_first, width, height );
 255         else
 256                 // Dissolve the frames using the time offset for mix value
 257                 dissolve_yuv( a_frame, b_frame, mix, *width, *height );
 258
 259         // Extract the a_frame image info
 260         *width = mlt_properties_get_int( a_props, "width" );
 261         *height = mlt_properties_get_int( a_props, "height" );
 262         *image = mlt_properties_get_data( a_props, "image", NULL );
 263
 264         return 0;
 265 }
 266
 267 /** Load the luma map from PGM stream.
 268 */
 269
 270 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
 271 {
 272         uint8_t *data = NULL;
 273         while (1)
 274         {
 275                 char line[128];
 276                 int i = 2;
 277                 int maxval;
 278                 int bpp;
 279                 uint16_t *p;
 280
 281                 line[127] = '\0';
 282
 283                 // get the magic code
 284                 if ( fgets( line, 127, f ) == NULL )
 285                         break;
 286                 if ( line[0] != 'P' || line[1] != '5' )
 287                         break;
 288
 289                 // skip white space and see if a new line must be fetched
 290                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 291                 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
 292                         break;
 293
 294                 // get the dimensions
 295                 if ( line[0] == 'P' )
 296                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 297                 else
 298                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 299
 300                 // get the height value, if not yet
 301                 if ( i < 2 )
 302                 {
 303                         if ( fgets( line, 127, f ) == NULL )
 304                                 break;
 305                         i = sscanf( line, "%d", height );
 306                         if ( i == 0 )
 307                                 break;
 308                         else
 309                                 i = 2;
 310                 }
 311
 312                 // get the maximum gray value, if not yet
 313                 if ( i < 3 )
 314                 {
 315                         if ( fgets( line, 127, f ) == NULL )
 316                                 break;
 317                         i = sscanf( line, "%d", &maxval );
 318                         if ( i == 0 )
 319                                 break;
 320                 }
 321
 322                 // determine if this is one or two bytes per pixel
 323                 bpp = maxval > 255 ? 2 : 1;
 324
 325                 // allocate temporary storage for the raw data
 326                 data = mlt_pool_alloc( *width * *height * bpp );
 327                 if ( data == NULL )
 328                         break;
 329
 330                 // read the raw data
 331                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 332                         break;
 333
 334                 // allocate the luma bitmap
 335                 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
 336                 if ( *map == NULL )
 337                         break;
 338
 339                 // proces the raw data into the luma bitmap
 340                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 341                 {
 342                         if ( bpp == 1 )
 343                                 *p++ = data[ i ] << 8;
 344                         else
 345                                 *p++ = ( data[ i ] << 8 ) + data[ i+1 ];
 346                 }
 347
 348                 break;
 349         }
 350
 351         if ( data != NULL )
 352                 mlt_pool_release( data );
 353 }
 354
 355
 356 /** Luma transition processing.
 357 */
 358
 359 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 360 {
 361         transition_luma *this = (transition_luma*) transition->child;
 362
 363         // Get the properties of the transition
 364         mlt_properties properties = mlt_transition_properties( transition );
 365
 366         // Get the properties of the b frame
 367         mlt_properties b_props = mlt_frame_properties( b_frame );
 368
 369         // If the filename property changed, reload the map
 370         char *lumafile = mlt_properties_get( properties, "resource" );
 371         if ( this->bitmap == NULL && lumafile != NULL )
 372         {
 373                 FILE *pipe = fopen( lumafile, "r" );
 374                 if ( pipe != NULL )
 375                 {
 376                         luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
 377                         fclose( pipe );
 378                 }
 379         }
 380
 381         // Set the b frame properties
 382         mlt_properties_set_double( b_props, "image.mix", position_calculate( transition, b_frame ) );
 383         mlt_properties_set_double( b_props, "luma.delta", delta_calculate( transition, b_frame ) );
 384         mlt_properties_set_int( b_props, "luma.width", this->width );
 385         mlt_properties_set_int( b_props, "luma.height", this->height );
 386         mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
 387         mlt_properties_set_int( b_props, "luma.reverse", mlt_properties_get_int( properties, "reverse" ) );
 388         mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
 389
 390         mlt_frame_push_get_image( a_frame, transition_get_image );
 391         mlt_frame_push_frame( a_frame, b_frame );
 392
 393         return a_frame;
 394 }
 395
 396 /** Constructor for the filter.
 397 */
 398
 399 mlt_transition transition_luma_init( char *lumafile )
 400 {
 401         transition_luma *this = calloc( sizeof( transition_luma ), 1 );
 402         if ( this != NULL )
 403         {
 404                 mlt_transition transition = &this->parent;
 405                 mlt_transition_init( transition, this );
 406                 transition->process = transition_process;
 407                 transition->close = transition_close;
 408                 mlt_properties_set( mlt_transition_properties( transition ), "resource", lumafile );
 409                 return &this->parent;
 410         }
 411         return NULL;
 412 }
 413
 414 /** Close the transition.
 415 */
 416
 417 static void transition_close( mlt_transition parent )
 418 {
 419         transition_luma *this = (transition_luma*) parent->child;
 420         mlt_pool_release( this->bitmap );
 421         free( this );
 422 }
 423