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         double *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 double smoothstep( double edge1, double edge2, double 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 /** powerful stuff
  63
  64     \param field_order -1 = progressive, 0 = lower field first, 1 = top field first
  65 */
  66 static void luma_composite( mlt_frame this, mlt_frame b_frame, int luma_width, int luma_height,
  67                                                         double *luma_bitmap, double pos, double frame_delta, double softness, int field_order )
  68 {
  69         int width_src, height_src;
  70         int width_dest, height_dest;
  71         mlt_image_format format_src, format_dest;
  72         uint8_t *p_src, *p_dest;
  73         int i, j;
  74         int stride_src;
  75         int stride_dest;
  76         double weight = 0;
  77         int field;
  78
  79         format_src = mlt_image_yuv422;
  80         format_dest = mlt_image_yuv422;
  81
  82         mlt_frame_get_image( this, &p_dest, &format_dest, &width_dest, &height_dest, 1 /* writable */ );
  83         mlt_frame_get_image( b_frame, &p_src, &format_src, &width_src, &height_src, 0 /* writable */ );
  84
  85         stride_src = width_src * 2;
  86         stride_dest = width_dest * 2;
  87
  88         // composite using luma map
  89         for ( field = 0; field < ( field_order < 0 ? 1 : 2 ); ++field )
  90         {
  91                 // Offset the position based on which field we're looking at ...
  92                 double field_pos = pos + ( ( field_order == 0 ? 1 - field : field) * frame_delta * 0.5 );
  93
  94                 // adjust the position for the softness level
  95                 field_pos *= ( 1.0 + softness );
  96
  97                 for ( i = field; i < height_src; i += ( field_order < 0 ? 1 : 2 ) )
  98                 {
  99                         uint8_t *p = &p_src[ i * stride_src ];
 100                         uint8_t *q = &p_dest[ i * stride_dest ];
 101                         uint8_t *o = &p_dest[ i * stride_dest ];
 102                         double  *l = &luma_bitmap[ i * luma_width ];
 103
 104                         for ( j = 0; j < width_src; j ++ )
 105                         {
 106                                 uint8_t y = *p ++;
 107                                 uint8_t uv = *p ++;
 108                 weight = *l ++;
 109                                 double value = smoothstep( weight, weight + softness, field_pos );
 110
 111                                 *o ++ = (uint8_t)( y * value + *q++ * ( 1 - value ) );
 112                                 *o ++ = (uint8_t)( uv * value + *q++ * ( 1 - value ) );
 113                         }
 114                 }
 115         }
 116 }
 117
 118 /** Get the image.
 119 */
 120
 121 static int transition_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 122 {
 123         // Get the properties of the a frame
 124         mlt_properties a_props = mlt_frame_properties( this );
 125
 126         // Get the b frame from the stack
 127         mlt_frame b_frame = mlt_frame_pop_frame( this );
 128
 129         // Get the properties of the b frame
 130         mlt_properties b_props = mlt_frame_properties( b_frame );
 131
 132         // Arbitrary composite defaults
 133         static double previous_mix = 0;
 134         double mix = 0;
 135         int luma_width = 0;
 136         int luma_height = 0;
 137         double *luma_bitmap = NULL;
 138         double luma_softness = 0;
 139         int progressive = 0;
 140         int top_field_first = 0;
 141
 142         // mix is the offset time value in the duration of the transition
 143         // - also used as the mixing level for a dissolve
 144         if ( mlt_properties_get( b_props, "mix" ) != NULL )
 145                 mix = mlt_properties_get_double( b_props, "mix" );
 146
 147         // (mix - previous_mix) is the animation delta, if backwards reset previous
 148         if ( mix < previous_mix )
 149                 previous_mix = 0;
 150
 151         // Get the interlace and field properties of the frame
 152         if ( mlt_properties_get( b_props, "progressive" ) != NULL )
 153                 progressive = mlt_properties_get_int( b_props, "progressive" );
 154         if ( mlt_properties_get( b_props, "top_field_first" ) != NULL )
 155                 top_field_first = mlt_properties_get_int( b_props, "top_field_first" );
 156
 157         // Get the luma map parameters
 158         if ( mlt_properties_get( b_props, "luma.width" ) != NULL )
 159                 luma_width = mlt_properties_get_int( b_props, "luma.width" );
 160         if ( mlt_properties_get( b_props, "luma.height" ) != NULL )
 161                 luma_height = mlt_properties_get_int( b_props, "luma.height" );
 162         if ( mlt_properties_get( b_props, "luma.softness" ) != NULL )
 163                 luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
 164         luma_bitmap = (double*) mlt_properties_get_data( b_props, "luma.bitmap", NULL );
 165
 166         if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
 167                 // Composite the frames using a luma map
 168                 luma_composite( this, b_frame, luma_width, luma_height, luma_bitmap, mix, mix - previous_mix,
 169                         luma_softness, progressive > 0 ? -1 : top_field_first );
 170         else
 171                 // Dissolve the frames using the time offset for mix value
 172                 mlt_frame_composite_yuv( this, b_frame, 0, 0, mix );
 173
 174         // Extract the a_frame image info
 175         *width = mlt_properties_get_int( a_props, "width" );
 176         *height = mlt_properties_get_int( a_props, "height" );
 177         *image = mlt_properties_get_data( a_props, "image", NULL );
 178
 179         // Close the b_frame
 180         mlt_frame_close( b_frame );
 181
 182         previous_mix = mix;
 183
 184         return 0;
 185 }
 186
 187
 188 /** Load the luma map from PGM stream.
 189 */
 190
 191 static void luma_read_pgm( FILE *f, double **map, int *width, int *height )
 192 {
 193         uint8_t *data = NULL;
 194         while (1)
 195         {
 196                 char line[128];
 197                 int i = 2;
 198                 int maxval;
 199                 int bpp;
 200                 double *p;
 201
 202                 line[127] = '\0';
 203
 204                 // get the magic code
 205                 if ( fgets( line, 127, f ) == NULL )
 206                         break;
 207                 if ( line[0] != 'P' || line[1] != '5' )
 208                         break;
 209
 210                 // skip white space and see if a new line must be fetched
 211                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 212                 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
 213                         break;
 214
 215                 // get the dimensions
 216                 if ( line[0] == 'P' )
 217                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 218                 else
 219                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 220
 221                 // get the height value, if not yet
 222                 if ( i < 2 )
 223                 {
 224                         if ( fgets( line, 127, f ) == NULL )
 225                                 break;
 226                         i = sscanf( line, "%d", height );
 227                         if ( i == 0 )
 228                                 break;
 229                         else
 230                                 i = 2;
 231                 }
 232
 233                 // get the maximum gray value, if not yet
 234                 if ( i < 3 )
 235                 {
 236                         if ( fgets( line, 127, f ) == NULL )
 237                                 break;
 238                         i = sscanf( line, "%d", &maxval );
 239                         if ( i == 0 )
 240                                 break;
 241                 }
 242
 243                 // determine if this is one or two bytes per pixel
 244                 bpp = maxval > 255 ? 2 : 1;
 245                         // allocate temporary storage for the raw data
 246                 data = malloc( *width * *height * bpp );
 247                 if ( data == NULL )
 248                         break;
 249
 250                 // read the raw data
 251                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 252                         break;
 253
 254                 // allocate the luma bitmap
 255                 *map =  p = (double*) malloc( *width * *height * sizeof( double ) );
 256                 if ( *map == NULL )
 257                         break;
 258
 259                 // proces the raw data into the luma bitmap
 260                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 261                 {
 262                         if ( bpp == 1 )
 263                                 *p++ = (double) data[ i ] / (double) maxval;
 264                         else
 265                                 *p++ = (double) ( ( data[ i ] << 8 ) + data[ i+1 ] ) / (double) maxval;
 266                 }
 267
 268                 break;
 269         }
 270
 271         if ( data != NULL )
 272                 free( data );
 273 }
 274
 275
 276 /** Luma transition processing.
 277 */
 278
 279 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 280 {
 281         transition_luma *this = (transition_luma*) transition->child;
 282
 283         // Get the properties of the transition
 284         mlt_properties properties = mlt_transition_properties( transition );
 285
 286         // Get the properties of the b frame
 287         mlt_properties b_props = mlt_frame_properties( b_frame );
 288
 289         // If the filename property changed, reload the map
 290         char *luma_file = mlt_properties_get( properties, "filename" );
 291         if ( luma_file != NULL && luma_file != this->filename )
 292         {
 293                 int width = mlt_properties_get_int( b_props, "width" );
 294                 int height = mlt_properties_get_int( b_props, "height" );
 295                 char command[ 512 ];
 296                 char *ext = strrchr( luma_file, '.' );
 297                 FILE *pipe;
 298
 299                 command[ 511 ] = '\0';
 300                 this->filename = luma_file;
 301                 snprintf( command, 511, "anytopnm %s | pnmscale -width %d -height %d", luma_file, width, height );
 302                 pipe = popen( command, "r" );
 303                 if ( pipe != NULL )
 304                 {
 305                         luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
 306                         pclose( pipe );
 307                 }
 308
 309         }
 310
 311         // Determine the time position of this frame in the transition duration
 312         mlt_timecode in = mlt_transition_get_in( transition );
 313         mlt_timecode out = mlt_transition_get_out( transition );
 314         mlt_timecode time = mlt_frame_get_timecode( b_frame );
 315         double pos = ( time - in ) / ( out - in );
 316
 317         // Set the b frame properties
 318         mlt_properties_set_double( b_props, "mix", pos );
 319         mlt_properties_set_int( b_props, "luma.width", this->width );
 320         mlt_properties_set_int( b_props, "luma.height", this->height );
 321         mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
 322         if ( mlt_properties_get( properties, "softness" ) != NULL )
 323                 mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
 324
 325         mlt_frame_push_get_image( a_frame, transition_get_image );
 326         mlt_frame_push_frame( a_frame, b_frame );
 327         return a_frame;
 328 }
 329
 330 /** Constructor for the filter.
 331 */
 332
 333 mlt_transition transition_luma_init( char *lumafile )
 334 {
 335         transition_luma *this = calloc( sizeof( transition_luma ), 1 );
 336         if ( this != NULL )
 337         {
 338                 mlt_transition transition = &this->parent;
 339                 mlt_transition_init( transition, this );
 340                 transition->process = transition_process;
 341                 transition->close = transition_close;
 342
 343                 if ( lumafile != NULL )
 344                         mlt_properties_set( mlt_transition_properties( transition ), "filename", lumafile );
 345
 346                 return &this->parent;
 347         }
 348         return NULL;
 349 }
 350
 351 /** Close the transition.
 352 */
 353
 354 static void transition_close( mlt_transition parent )
 355 {
 356         transition_luma *this = (transition_luma*) parent->child;
 357
 358         if ( this->bitmap )
 359                 free( this->bitmap );
 360
 361         parent->close = NULL;
 362         mlt_transition_close( parent );
 363         free( this );
 364 }
 365