git.sesse.net Git - mlt/blob - src/modules/core/filter_mirror.c

   1 /*
   2  * filter_mirror.c -- mirror filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <framework/mlt_filter.h>
  22 #include <framework/mlt_frame.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 /** Do it :-).
  29 */
  30
  31 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  32 {
  33         // Pop the mirror filter from the stack
  34         mlt_filter this = mlt_frame_pop_service( frame );
  35
  36         // Get the mirror type
  37         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  38
  39         // Get the properties
  40         char *mirror = mlt_properties_get( properties, "mirror" );
  41
  42         // Determine if reverse is required
  43         int reverse = mlt_properties_get_int( properties, "reverse" );
  44
  45         // Get the image
  46         int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
  47
  48         // Get the alpha
  49         uint8_t *alpha = mlt_frame_get_alpha_mask( frame );
  50
  51         // If we have an image of the right colour space
  52         if ( error == 0 && *format == mlt_image_yuv422 )
  53         {
  54                 // We'll KISS here
  55                 int hh = *height / 2;
  56
  57                 if ( !strcmp( mirror, "horizontal" ) )
  58                 {
  59                         uint8_t *p = NULL;
  60                         uint8_t *q = NULL;
  61                         uint8_t *a = NULL;
  62                         uint8_t *b = NULL;
  63                         int i;
  64                         int uneven_w = ( *width % 2 ) * 2;
  65                         for ( i = 0; i < *height; i ++ )
  66                         {
  67                                 p = ( uint8_t * )*image + i * *width * 2;
  68                                 q = p + *width * 2;
  69                                 a = alpha + i * *width;
  70                                 b = a + *width - 1;
  71                                 if ( !reverse )
  72                                 {
  73                                         while ( p < q )
  74                                         {
  75                                                 *p ++ = *( q - 2 );
  76                                                 *p ++ = *( q - 3 - uneven_w );
  77                                                 *p ++ = *( q - 4 );
  78                                                 *p ++ = *( q - 1 - uneven_w );
  79                                                 q -= 4;
  80                                                 *a ++ = *b --;
  81                                                 *a ++ = *b --;
  82                                         }
  83                                 }
  84                                 else
  85                                 {
  86                                         while ( p < q )
  87                                         {
  88                                                 *( q - 2 ) = *p ++;
  89                                                 *( q - 3 - uneven_w ) = *p ++;
  90                                                 *( q - 4 ) = *p ++;
  91                                                 *( q - 1 - uneven_w ) = *p ++;
  92                                                 q -= 4;
  93                                                 *b -- = *a ++;
  94                                                 *b -- = *a ++;
  95                                         }
  96                                 }
  97                         }
  98                 }
  99                 else if ( !strcmp( mirror, "vertical" ) )
 100                 {
 101                         uint16_t *end = ( uint16_t *)*image + *width * *height;
 102                         uint16_t *p = NULL;
 103                         uint16_t *q = NULL;
 104                         uint8_t *a = NULL;
 105                         uint8_t *b = NULL;
 106                         int i;
 107                         int j;
 108                         for ( i = 0; i < hh; i ++ )
 109                         {
 110                                 p = ( uint16_t * )*image + i * *width;
 111                                 q = end - ( i + 1 ) * *width;
 112                                 j = *width;
 113                                 a = alpha + i * *width;
 114                                 b = alpha + ( *height - i - 1 ) * *width;
 115                                 if ( !reverse )
 116                                 {
 117                                         while ( j -- )
 118                                         {
 119                                                 *p ++ = *q ++;
 120                                                 *a ++ = *b ++;
 121                                         }
 122                                 }
 123                                 else
 124                                 {
 125                                         while ( j -- )
 126                                         {
 127                                                 *q ++ = *p ++;
 128                                                 *b ++ = *a ++;
 129                                         }
 130                                 }
 131                         }
 132                 }
 133                 else if ( !strcmp( mirror, "diagonal" ) )
 134                 {
 135                         uint8_t *end = ( uint8_t *)*image + *width * *height * 2;
 136                         uint8_t *p = NULL;
 137                         uint8_t *q = NULL;
 138                         uint8_t *a = NULL;
 139                         uint8_t *b = NULL;
 140                         int i;
 141                         int j;
 142                         int uneven_w = ( *width % 2 ) * 2;
 143                         for ( i = 0; i < *height; i ++ )
 144                         {
 145                                 p = ( uint8_t * )*image + i * *width * 2;
 146                                 q = end - i * *width * 2;
 147                                 j = ( ( *width * ( *height - i ) ) / *height ) / 2;
 148                                 a = alpha + i * *width;
 149                                 b = alpha + ( *height - i - 1 ) * *width;
 150                                 if ( !reverse )
 151                                 {
 152                                         while ( j -- )
 153                                         {
 154                                                 *p ++ = *( q - 2 );
 155                                                 *p ++ = *( q - 3 - uneven_w );
 156                                                 *p ++ = *( q - 4 );
 157                                                 *p ++ = *( q - 1 - uneven_w );
 158                                                 q -= 4;
 159                                                 *a ++ = *b --;
 160                                                 *a ++ = *b --;
 161                                         }
 162                                 }
 163                                 else
 164                                 {
 165                                         while ( j -- )
 166                                         {
 167                                                 *( q - 2 ) = *p ++;
 168                                                 *( q - 3 - uneven_w ) = *p ++;
 169                                                 *( q - 4 ) = *p ++;
 170                                                 *( q - 1 - uneven_w ) = *p ++;
 171                                                 q -= 4;
 172                                                 *b -- = *a ++;
 173                                                 *b -- = *a ++;
 174                                         }
 175                                 }
 176                         }
 177                 }
 178                 else if ( !strcmp( mirror, "xdiagonal" ) )
 179                 {
 180                         uint8_t *end = ( uint8_t *)*image + *width * *height * 2;
 181                         uint8_t *p = NULL;
 182                         uint8_t *q = NULL;
 183                         int i;
 184                         int j;
 185                         uint8_t *a = NULL;
 186                         uint8_t *b = NULL;
 187                         int uneven_w = ( *width % 2 ) * 2;
 188                         for ( i = 0; i < *height; i ++ )
 189                         {
 190                                 p = ( uint8_t * )*image + ( i + 1 ) * *width * 2;
 191                                 q = end - ( i + 1 ) * *width * 2;
 192                                 j = ( ( *width * ( *height - i ) ) / *height ) / 2;
 193                                 a = alpha + ( i + 1 ) * *width - 1;
 194                                 b = alpha + ( *height - i - 1 ) * *width;
 195                                 if ( !reverse )
 196                                 {
 197                                         while ( j -- )
 198                                         {
 199                                                 *q ++ = *( p - 2 );
 200                                                 *q ++ = *( p - 3 - uneven_w );
 201                                                 *q ++ = *( p - 4 );
 202                                                 *q ++ = *( p - 1 - uneven_w );
 203                                                 p -= 4;
 204                                                 *b ++ = *a --;
 205                                                 *b ++ = *a --;
 206                                         }
 207                                 }
 208                                 else
 209                                 {
 210                                         while ( j -- )
 211                                         {
 212                                                 *( p - 2 ) = *q ++;
 213                                                 *( p - 3 - uneven_w ) = *q ++;
 214                                                 *( p - 4 ) = *q ++;
 215                                                 *( p - 1 - uneven_w ) = *q ++;
 216                                                 p -= 4;
 217                                                 *a -- = *b ++;
 218                                                 *a -- = *b ++;
 219                                         }
 220                                 }
 221                         }
 222                 }
 223                 else if ( !strcmp( mirror, "flip" ) )
 224                 {
 225                         uint8_t t[ 4 ];
 226                         uint8_t *p = NULL;
 227                         uint8_t *q = NULL;
 228                         int i;
 229                         uint8_t *a = NULL;
 230                         uint8_t *b = NULL;
 231                         uint8_t c;
 232                         int uneven_w = ( *width % 2 ) * 2;
 233                         for ( i = 0; i < *height; i ++ )
 234                         {
 235                                 p = ( uint8_t * )*image + i * *width * 2;
 236                                 q = p + *width * 2;
 237                                 a = alpha + i * *width;
 238                                 b = a + *width - 1;
 239                                 while ( p < q )
 240                                 {
 241                                         t[ 0 ] = p[ 0 ];
 242                                         t[ 1 ] = p[ 1 + uneven_w ];
 243                                         t[ 2 ] = p[ 2 ];
 244                                         t[ 3 ] = p[ 3 + uneven_w ];
 245                                         *p ++ = *( q - 2 );
 246                                         *p ++ = *( q - 3 - uneven_w );
 247                                         *p ++ = *( q - 4 );
 248                                         *p ++ = *( q - 1 - uneven_w );
 249                                         *( -- q ) = t[ 3 ];
 250                                         *( -- q ) = t[ 0 ];
 251                                         *( -- q ) = t[ 1 ];
 252                                         *( -- q ) = t[ 2 ];
 253                                         c = *a;
 254                                         *a ++ = *b;
 255                                         *b -- = c;
 256                                         c = *a;
 257                                         *a ++ = *b;
 258                                         *b -- = c;
 259                                 }
 260                         }
 261                 }
 262                 else if ( !strcmp( mirror, "flop" ) )
 263                 {
 264                         uint16_t *end = ( uint16_t *)*image + *width * *height;
 265                         uint16_t *p = NULL;
 266                         uint16_t *q = NULL;
 267                         uint16_t t;
 268                         uint8_t *a = NULL;
 269                         uint8_t *b = NULL;
 270                         uint8_t c;
 271                         int i;
 272                         int j;
 273                         for ( i = 0; i < hh; i ++ )
 274                         {
 275                                 p = ( uint16_t * )*image + i * *width;
 276                                 q = end - ( i + 1 ) * *width;
 277                                 a = alpha + i * *width;
 278                                 b = alpha + ( *height - i - 1 ) * *width;
 279                                 j = *width;
 280                                 while ( j -- )
 281                                 {
 282                                         t = *p;
 283                                         *p ++ = *q;
 284                                         *q ++ = t;
 285                                         c = *a;
 286                                         *a ++ = *b;
 287                                         *b ++ = c;
 288                                 }
 289                         }
 290                 }
 291         }
 292
 293         // Return the error
 294         return error;
 295 }
 296
 297 /** Filter processing.
 298 */
 299
 300 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 301 {
 302         // Push the service on to the stack
 303         mlt_frame_push_service( frame, this );
 304
 305         // Push the filter method on to the stack
 306         mlt_frame_push_service( frame, filter_get_image );
 307
 308         return frame;
 309 }
 310
 311 /** Constructor for the filter.
 312 */
 313
 314 mlt_filter filter_mirror_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 315 {
 316         // Construct a new filter
 317         mlt_filter this = mlt_filter_new( );
 318
 319         // If we have a filter, initialise it
 320         if ( this != NULL )
 321         {
 322                 // Get the properties
 323                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 324
 325                 // Set the default mirror type
 326                 mlt_properties_set_or_default( properties, "mirror", arg, "horizontal" );
 327
 328                 // Assign the process method
 329                 this->process = filter_process;
 330         }
 331
 332         // Return the filter
 333         return this;
 334 }
 335