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