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 #include <math.h>
  29
  30 /** Luma class.
  31 */
  32
  33 typedef struct
  34 {
  35         struct mlt_transition_s parent;
  36         int width;
  37         int height;
  38         uint16_t *bitmap;
  39 }
  40 transition_luma;
  41
  42
  43 // forward declarations
  44 static void transition_close( mlt_transition parent );
  45
  46 /** Calculate the position for this frame.
  47 */
  48
  49 static float position_calculate( mlt_transition this, mlt_frame frame )
  50 {
  51         // Get the in and out position
  52         mlt_position in = mlt_transition_get_in( this );
  53         mlt_position out = mlt_transition_get_out( this );
  54
  55         // Get the position of the frame
  56         mlt_position position = mlt_frame_get_position( frame );
  57
  58         // Now do the calcs
  59         return ( float )( position - in ) / ( float )( out - in + 1 );
  60 }
  61
  62 /** Calculate the field delta for this frame - position between two frames.
  63 */
  64
  65 static float delta_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         float x = ( float )( position - in ) / ( float )( out - in + 1 );
  76         float y = ( float )( position + 1 - in ) / ( float )( out - in + 1 );
  77
  78         return ( y - x ) / 2.0;
  79 }
  80
  81 static inline int dissolve_yuv( mlt_frame this, mlt_frame that, float weight, int width, int height )
  82 {
  83         int ret = 0;
  84         int width_src = width, height_src = height;
  85         mlt_image_format format = mlt_image_yuv422;
  86         uint8_t *p_src, *p_dest;
  87         uint8_t *p;
  88         uint8_t *limit;
  89
  90         int32_t weigh = weight * ( 1 << 16 );
  91         int32_t weigh_complement = ( 1 - weight ) * ( 1 << 16 );
  92
  93         mlt_frame_get_image( this, &p_dest, &format, &width, &height, 1 );
  94         mlt_frame_get_image( that, &p_src, &format, &width_src, &height_src, 0 );
  95
  96         p = p_dest;
  97         limit = p_dest + height_src * width_src * 2;
  98
  99         while ( p < limit )
 100         {
 101                 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
 102                 *p_dest++ = ( *p_src++ * weigh + *p++ * weigh_complement ) >> 16;
 103         }
 104
 105         return ret;
 106 }
 107
 108 // image processing functions
 109
 110 static inline uint32_t smoothstep( int32_t edge1, int32_t edge2, uint32_t a )
 111 {
 112         if ( a < edge1 )
 113                 return 0;
 114
 115         if ( a >= edge2 )
 116                 return 0x10000;
 117
 118         a = ( ( a - edge1 ) << 16 ) / ( edge2 - edge1 );
 119
 120         return ( ( ( a * a ) >> 16 )  * ( ( 3 << 16 ) - ( 2 * a ) ) ) >> 16;
 121 }
 122
 123 /** powerful stuff
 124
 125     \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
 126 */
 127 static void luma_composite( mlt_frame a_frame, mlt_frame b_frame, int luma_width, int luma_height,
 128                                                         uint16_t *luma_bitmap, float pos, float frame_delta, float softness, int field_order,
 129                                                         int *width, int *height )
 130 {
 131         int width_src = *width, height_src = *height;
 132         int width_dest = *width, height_dest = *height;
 133         mlt_image_format format_src = mlt_image_yuv422, format_dest = mlt_image_yuv422;
 134         uint8_t *p_src, *p_dest;
 135         int i, j;
 136         int stride_src;
 137         int stride_dest;
 138         uint16_t weight = 0;
 139
 140         format_src = mlt_image_yuv422;
 141         format_dest = mlt_image_yuv422;
 142
 143         mlt_frame_get_image( a_frame, &p_dest, &format_dest, &width_dest, &height_dest, 1 );
 144         mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 );
 145
 146         stride_src = width_src * 2;
 147         stride_dest = width_dest * 2;
 148
 149         // Offset the position based on which field we're looking at ...
 150         int32_t field_pos[ 2 ];
 151         field_pos[ 0 ] = ( pos + ( ( field_order == 0 ? 1 : 0 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
 152         field_pos[ 1 ] = ( pos + ( ( field_order == 0 ? 0 : 1 ) * frame_delta * 0.5 ) ) * ( 1 << 16 ) * ( 1.0 + softness );
 153
 154         register uint8_t *p;
 155         register uint8_t *q;
 156         register uint8_t *o;
 157         uint16_t  *l;
 158
 159         uint32_t value;
 160
 161         int32_t x_diff = ( luma_width << 16 ) / *width;
 162         int32_t y_diff = ( luma_height << 16 ) / *height;
 163         int32_t x_offset = 0;
 164         int32_t y_offset = 0;
 165         uint8_t *p_row;
 166         uint8_t *q_row;
 167
 168         int32_t i_softness = softness * ( 1 << 16 );
 169
 170         int field_count = field_order <= 0 ? 1 : 2;
 171         int field_stride_src = field_count * stride_src;
 172         int field_stride_dest = field_count * stride_dest;
 173
 174         int field = 0;
 175
 176         // composite using luma map
 177         while ( field < field_count )
 178         {
 179                 p_row = p_src + field * stride_src;
 180                 q_row = p_dest + field * stride_dest;
 181                 y_offset = ( field * luma_width ) << 16;
 182                 i = field;
 183
 184                 while ( i < height_src )
 185                 {
 186                         p = p_row;
 187                         q = q_row;
 188                         o = q;
 189                         l = luma_bitmap + ( y_offset >> 16 ) * ( luma_width * field_count );
 190                         x_offset = 0;
 191                         j = width_src;
 192
 193                         while( j -- )
 194                         {
 195                 weight = l[ x_offset >> 16 ];
 196                                 value = smoothstep( weight, i_softness + weight, field_pos[ field ] );
 197                                 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 198                                 *o ++ = ( *p ++ * value + *q++ * ( ( 1 << 16 ) - value ) ) >> 16;
 199                                 x_offset += x_diff;
 200                         }
 201
 202                         y_offset += y_diff;
 203                         i += field_count;
 204                         p_row += field_stride_src;
 205                         q_row += field_stride_dest;
 206                 }
 207
 208                 field ++;
 209         }
 210 }
 211
 212 /** Get the image.
 213 */
 214
 215 static int transition_get_image( mlt_frame a_frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 216 {
 217         // Get the properties of the a frame
 218         mlt_properties a_props = mlt_frame_properties( a_frame );
 219
 220         // Get the b frame from the stack
 221         mlt_frame b_frame = mlt_frame_pop_frame( a_frame );
 222
 223         // Get the properties of the b frame
 224         mlt_properties b_props = mlt_frame_properties( b_frame );
 225
 226         // Arbitrary composite defaults
 227         float mix = mlt_properties_get_double( b_props, "image.mix" );
 228         float frame_delta = mlt_properties_get_double( b_props, "luma.delta" );
 229         int luma_width = mlt_properties_get_int( b_props, "luma.width" );
 230         int luma_height = mlt_properties_get_int( b_props, "luma.height" );
 231         uint16_t *luma_bitmap = mlt_properties_get_data( b_props, "luma.bitmap", NULL );
 232         float luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
 233         int progressive = mlt_properties_get_int( b_props, "progressive" ) ||
 234                         mlt_properties_get_int( a_props, "consumer_progressive" ) ||
 235                         mlt_properties_get_int( b_props, "luma.progressive" );
 236
 237         int top_field_first =  mlt_properties_get_int( b_props, "top_field_first" );
 238         int reverse = mlt_properties_get_int( b_props, "luma.reverse" );
 239
 240         // Since we are the consumer of the b_frame, we must pass along this
 241         // consumer property from the a_frame
 242         mlt_properties_set_double( b_props, "consumer_aspect_ratio", mlt_properties_get_double( a_props, "consumer_aspect_ratio" ) );
 243         mlt_properties_set_double( b_props, "consumer_scale", mlt_properties_get_double( a_props, "consumer_scale" ) );
 244
 245         // Honour the reverse here
 246         if ( mix >= 1.0 )
 247                 mix -= floor( mix );
 248
 249         mix = reverse ? 1 - mix : mix;
 250         frame_delta *= reverse ? -1.0 : 1.0;
 251
 252         // Ensure we get scaling on the b_frame
 253         mlt_properties_set( b_props, "rescale.interp", "nearest" );
 254
 255         if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
 256                 // Composite the frames using a luma map
 257                 luma_composite( a_frame, b_frame, luma_width, luma_height, luma_bitmap, mix, frame_delta,
 258                         luma_softness, progressive ? -1 : top_field_first, width, height );
 259         else
 260                 // Dissolve the frames using the time offset for mix value
 261                 dissolve_yuv( a_frame, b_frame, mix, *width, *height );
 262
 263         // Extract the a_frame image info
 264         *width = mlt_properties_get_int( a_props, "width" );
 265         *height = mlt_properties_get_int( a_props, "height" );
 266         *image = mlt_properties_get_data( a_props, "image", NULL );
 267
 268         return 0;
 269 }
 270
 271 /** Load the luma map from PGM stream.
 272 */
 273
 274 static void luma_read_pgm( FILE *f, uint16_t **map, int *width, int *height )
 275 {
 276         uint8_t *data = NULL;
 277         while (1)
 278         {
 279                 char line[128];
 280                 int i = 2;
 281                 int maxval;
 282                 int bpp;
 283                 uint16_t *p;
 284
 285                 line[127] = '\0';
 286
 287                 // get the magic code
 288                 if ( fgets( line, 127, f ) == NULL )
 289                         break;
 290                 if ( line[0] != 'P' || line[1] != '5' )
 291                         break;
 292
 293                 // skip white space and see if a new line must be fetched
 294                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 295                 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
 296                         break;
 297
 298                 // get the dimensions
 299                 if ( line[0] == 'P' )
 300                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 301                 else
 302                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 303
 304                 // get the height value, if not yet
 305                 if ( i < 2 )
 306                 {
 307                         if ( fgets( line, 127, f ) == NULL )
 308                                 break;
 309                         i = sscanf( line, "%d", height );
 310                         if ( i == 0 )
 311                                 break;
 312                         else
 313                                 i = 2;
 314                 }
 315
 316                 // get the maximum gray value, if not yet
 317                 if ( i < 3 )
 318                 {
 319                         if ( fgets( line, 127, f ) == NULL )
 320                                 break;
 321                         i = sscanf( line, "%d", &maxval );
 322                         if ( i == 0 )
 323                                 break;
 324                 }
 325
 326                 // determine if this is one or two bytes per pixel
 327                 bpp = maxval > 255 ? 2 : 1;
 328
 329                 // allocate temporary storage for the raw data
 330                 data = mlt_pool_alloc( *width * *height * bpp );
 331                 if ( data == NULL )
 332                         break;
 333
 334                 // read the raw data
 335                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 336                         break;
 337
 338                 // allocate the luma bitmap
 339                 *map = p = (uint16_t*)mlt_pool_alloc( *width * *height * sizeof( uint16_t ) );
 340                 if ( *map == NULL )
 341                         break;
 342
 343                 // proces the raw data into the luma bitmap
 344                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 345                 {
 346                         if ( bpp == 1 )
 347                                 *p++ = data[ i ] << 8;
 348                         else
 349                                 *p++ = ( data[ i ] << 8 ) + data[ i+1 ];
 350                 }
 351
 352                 break;
 353         }
 354
 355         if ( data != NULL )
 356                 mlt_pool_release( data );
 357 }
 358
 359
 360 /** Luma transition processing.
 361 */
 362
 363 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 364 {
 365         transition_luma *this = (transition_luma*) transition->child;
 366
 367         // Get the properties of the transition
 368         mlt_properties properties = mlt_transition_properties( transition );
 369
 370         // Get the properties of the b frame
 371         mlt_properties b_props = mlt_frame_properties( b_frame );
 372
 373         // If the filename property changed, reload the map
 374         char *lumafile = mlt_properties_get( properties, "resource" );
 375         if ( this->bitmap == NULL && lumafile != NULL )
 376         {
 377                 FILE *pipe = fopen( lumafile, "r" );
 378                 if ( pipe != NULL )
 379                 {
 380                         luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
 381                         fclose( pipe );
 382                 }
 383         }
 384
 385         // Set the b frame properties
 386         mlt_properties_set_double( b_props, "image.mix", position_calculate( transition, a_frame ) );
 387         mlt_properties_set_double( b_props, "luma.delta", delta_calculate( transition, a_frame ) );
 388         mlt_properties_set_int( b_props, "luma.width", this->width );
 389         mlt_properties_set_int( b_props, "luma.height", this->height );
 390         mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
 391         mlt_properties_set_int( b_props, "luma.reverse", mlt_properties_get_int( properties, "reverse" ) );
 392         mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
 393
 394         mlt_frame_push_get_image( a_frame, transition_get_image );
 395         mlt_frame_push_frame( a_frame, b_frame );
 396
 397         return a_frame;
 398 }
 399
 400 /** Constructor for the filter.
 401 */
 402
 403 mlt_transition transition_luma_init( char *lumafile )
 404 {
 405         transition_luma *this = calloc( sizeof( transition_luma ), 1 );
 406         if ( this != NULL )
 407         {
 408                 mlt_transition transition = &this->parent;
 409                 mlt_transition_init( transition, this );
 410                 transition->process = transition_process;
 411                 transition->close = transition_close;
 412                 mlt_properties_set( mlt_transition_properties( transition ), "resource", lumafile );
 413                 return &this->parent;
 414         }
 415         return NULL;
 416 }
 417
 418 /** Close the transition.
 419 */
 420
 421 static void transition_close( mlt_transition parent )
 422 {
 423         transition_luma *this = (transition_luma*) parent->child;
 424         mlt_pool_release( this->bitmap );
 425         free( this );
 426 }
 427