research.m1stereo.tv/gitweb/ - melted/blob - mlt/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 /** 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                                                         float *luma_bitmap, float pos, float frame_delta, float 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         float 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         // Offset the position based on which field we're looking at ...
  89         float field_pos[ 2 ];
  90         field_pos[ 0 ] = pos + ( ( field_order == 0 ? 1 : 0 ) * frame_delta * 0.5 );
  91         field_pos[ 1 ] = pos + ( ( field_order == 0 ? 0 : 1 ) * frame_delta * 0.5 );
  92
  93         // adjust the position for the softness level
  94         field_pos[ 0 ] *= ( 1.0 + softness );
  95         field_pos[ 1 ] *= ( 1.0 + softness );
  96
  97         uint8_t *p;
  98         uint8_t *q;
  99         uint8_t *o;
 100         float  *l;
 101
 102         uint8_t y;
 103         uint8_t uv;
 104         float value;
 105
 106         // composite using luma map
 107         for ( field = 0; field < ( field_order < 0 ? 1 : 2 ); ++field )
 108         {
 109                 for ( i = field; i < height_src; i += ( field_order < 0 ? 1 : 2 ) )
 110                 {
 111                         p = &p_src[ i * stride_src ];
 112                         q = &p_dest[ i * stride_dest ];
 113                         o = &p_dest[ i * stride_dest ];
 114                         l = &luma_bitmap[ i * luma_width ];
 115
 116                         for ( j = 0; j < width_src; j ++ )
 117                         {
 118                                 y = *p ++;
 119                                 uv = *p ++;
 120                 weight = *l ++;
 121                                 value = smoothstep( weight, weight + softness, field_pos[ field ] );
 122
 123                                 *o ++ = (uint8_t)( y * value + *q++ * ( 1 - value ) );
 124                                 *o ++ = (uint8_t)( uv * value + *q++ * ( 1 - value ) );
 125                         }
 126                 }
 127         }
 128 }
 129
 130 /** Get the image.
 131 */
 132
 133 static int transition_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
 134 {
 135         // Get the properties of the a frame
 136         mlt_properties a_props = mlt_frame_properties( this );
 137
 138         // Get the b frame from the stack
 139         mlt_frame b_frame = mlt_frame_pop_frame( this );
 140
 141         // Get the properties of the b frame
 142         mlt_properties b_props = mlt_frame_properties( b_frame );
 143
 144         // Arbitrary composite defaults
 145         float frame_delta = 1 / mlt_properties_get_double( b_props, "fps" );
 146         float mix = mlt_properties_get_double( b_props, "image.mix" );
 147         int luma_width = mlt_properties_get_int( b_props, "luma.width" );
 148         int luma_height = mlt_properties_get_int( b_props, "luma.height" );
 149         float *luma_bitmap = mlt_properties_get_data( b_props, "luma.bitmap", NULL );
 150         float luma_softness = mlt_properties_get_double( b_props, "luma.softness" );
 151         int progressive = mlt_properties_get_int( b_props, "progressive" );
 152         int top_field_first =  mlt_properties_get_int( b_props, "top_field_first" );
 153         int reverse = mlt_properties_get_int( b_props, "luma.reverse" );
 154
 155         // Honour the reverse here
 156         mix = reverse ? 1 - mix : mix;
 157
 158         if ( luma_width > 0 && luma_height > 0 && luma_bitmap != NULL )
 159                 // Composite the frames using a luma map
 160                 luma_composite( this, b_frame, luma_width, luma_height, luma_bitmap, mix, frame_delta,
 161                         luma_softness, progressive > 0 ? -1 : top_field_first );
 162         else
 163                 // Dissolve the frames using the time offset for mix value
 164                 mlt_frame_composite_yuv( this, b_frame, 0, 0, mix );
 165
 166         // Extract the a_frame image info
 167         *width = mlt_properties_get_int( a_props, "width" );
 168         *height = mlt_properties_get_int( a_props, "height" );
 169         *image = mlt_properties_get_data( a_props, "image", NULL );
 170
 171         return 0;
 172 }
 173
 174 /** Load the luma map from PGM stream.
 175 */
 176
 177 static void luma_read_pgm( FILE *f, float **map, int *width, int *height )
 178 {
 179         uint8_t *data = NULL;
 180         while (1)
 181         {
 182                 char line[128];
 183                 int i = 2;
 184                 int maxval;
 185                 int bpp;
 186                 float *p;
 187
 188                 line[127] = '\0';
 189
 190                 // get the magic code
 191                 if ( fgets( line, 127, f ) == NULL )
 192                         break;
 193                 if ( line[0] != 'P' || line[1] != '5' )
 194                         break;
 195
 196                 // skip white space and see if a new line must be fetched
 197                 for ( i = 2; i < 127 && line[i] != '\0' && isspace( line[i] ); i++ );
 198                 if ( line[i] == '\0' && fgets( line, 127, f ) == NULL )
 199                         break;
 200
 201                 // get the dimensions
 202                 if ( line[0] == 'P' )
 203                         i = sscanf( line, "P5 %d %d %d", width, height, &maxval );
 204                 else
 205                         i = sscanf( line, "%d %d %d", width, height, &maxval );
 206
 207                 // get the height value, if not yet
 208                 if ( i < 2 )
 209                 {
 210                         if ( fgets( line, 127, f ) == NULL )
 211                                 break;
 212                         i = sscanf( line, "%d", height );
 213                         if ( i == 0 )
 214                                 break;
 215                         else
 216                                 i = 2;
 217                 }
 218
 219                 // get the maximum gray value, if not yet
 220                 if ( i < 3 )
 221                 {
 222                         if ( fgets( line, 127, f ) == NULL )
 223                                 break;
 224                         i = sscanf( line, "%d", &maxval );
 225                         if ( i == 0 )
 226                                 break;
 227                 }
 228
 229                 // determine if this is one or two bytes per pixel
 230                 bpp = maxval > 255 ? 2 : 1;
 231                         // allocate temporary storage for the raw data
 232                 data = malloc( *width * *height * bpp );
 233                 if ( data == NULL )
 234                         break;
 235
 236                 // read the raw data
 237                 if ( fread( data, *width * *height * bpp, 1, f ) != 1 )
 238                         break;
 239
 240                 // allocate the luma bitmap
 241                 *map =  p = (float*) malloc( *width * *height * sizeof( float ) );
 242                 if ( *map == NULL )
 243                         break;
 244
 245                 // proces the raw data into the luma bitmap
 246                 for ( i = 0; i < *width * *height * bpp; i += bpp )
 247                 {
 248                         if ( bpp == 1 )
 249                                 *p++ = (float) data[ i ] / (float) maxval;
 250                         else
 251                                 *p++ = (float) ( ( data[ i ] << 8 ) + data[ i+1 ] ) / (float) maxval;
 252                 }
 253
 254                 break;
 255         }
 256
 257         if ( data != NULL )
 258                 free( data );
 259 }
 260
 261
 262 /** Luma transition processing.
 263 */
 264
 265 static mlt_frame transition_process( mlt_transition transition, mlt_frame a_frame, mlt_frame b_frame )
 266 {
 267         transition_luma *this = (transition_luma*) transition->child;
 268
 269         // Get the properties of the transition
 270         mlt_properties properties = mlt_transition_properties( transition );
 271
 272         // Get the properties of the b frame
 273         mlt_properties b_props = mlt_frame_properties( b_frame );
 274
 275         // If the filename property changed, reload the map
 276         char *luma_file = mlt_properties_get( properties, "filename" );
 277         if ( luma_file != NULL && ( this->filename == NULL || ( this->filename && strcmp( luma_file, this->filename ) ) ) )
 278         {
 279                 int width = mlt_properties_get_int( b_props, "width" );
 280                 int height = mlt_properties_get_int( b_props, "height" );
 281                 char command[ 512 ];
 282                 FILE *pipe;
 283
 284                 command[ 511 ] = '\0';
 285                 if ( this->filename )
 286                         free( this->filename );
 287                 this->filename = strdup( luma_file );
 288                 snprintf( command, 511, "anytopnm %s | pnmscale -width %d -height %d", luma_file, width, height );
 289                 //pipe = popen( command, "r" );
 290                 pipe = fopen( luma_file, "r" );
 291                 if ( pipe != NULL )
 292                 {
 293                         if ( this->bitmap )
 294                                 free( this->bitmap );
 295                         luma_read_pgm( pipe, &this->bitmap, &this->width, &this->height );
 296                         //pclose( pipe );
 297                         fclose( pipe );
 298                 }
 299
 300         }
 301
 302         // Determine the time position of this frame in the transition duration
 303         mlt_position in = mlt_transition_get_in( transition );
 304         mlt_position out = mlt_transition_get_out( transition );
 305         mlt_position time = mlt_frame_get_position( b_frame );
 306         float pos = ( float )( time - in ) / ( float )( out - in + 1 );
 307
 308         // Set the b frame properties
 309         mlt_properties_set_double( b_props, "image.mix", pos );
 310         mlt_properties_set_int( b_props, "luma.width", this->width );
 311         mlt_properties_set_int( b_props, "luma.height", this->height );
 312         mlt_properties_set_data( b_props, "luma.bitmap", this->bitmap, 0, NULL, NULL );
 313         mlt_properties_set_int( b_props, "luma.reverse", mlt_properties_get_int( properties, "reverse" ) );
 314         mlt_properties_set_double( b_props, "luma.softness", mlt_properties_get_double( properties, "softness" ) );
 315
 316         mlt_frame_push_get_image( a_frame, transition_get_image );
 317         mlt_frame_push_frame( a_frame, b_frame );
 318
 319         return a_frame;
 320 }
 321
 322 /** Constructor for the filter.
 323 */
 324
 325 mlt_transition transition_luma_init( char *lumafile )
 326 {
 327         transition_luma *this = calloc( sizeof( transition_luma ), 1 );
 328         if ( this != NULL )
 329         {
 330                 mlt_transition transition = &this->parent;
 331                 mlt_transition_init( transition, this );
 332                 transition->process = transition_process;
 333                 transition->close = transition_close;
 334
 335                 if ( lumafile != NULL )
 336                         mlt_properties_set( mlt_transition_properties( transition ), "filename", lumafile );
 337
 338                 return &this->parent;
 339         }
 340         return NULL;
 341 }
 342
 343 /** Close the transition.
 344 */
 345
 346 static void transition_close( mlt_transition parent )
 347 {
 348         transition_luma *this = (transition_luma*) parent->child;
 349
 350         if ( this->bitmap )
 351                 free( this->bitmap );
 352
 353         if ( this->filename )
 354                 free( this->filename );
 355
 356         free( this );
 357 }
 358