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 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 "filter_mirror.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 /** Do it :-).
  30 */
  31
  32 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  33 {
  34         // Pop the mirror filter from the stack
  35         mlt_filter this = mlt_frame_pop_service( frame );
  36
  37         // Get the mirror type
  38         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  39
  40         // Get the properties
  41         char *mirror = mlt_properties_get( properties, "mirror" );
  42
  43         // Determine if reverse is required
  44         int reverse = mlt_properties_get_int( properties, "reverse" );
  45
  46         // Get the image
  47         int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
  48
  49         // If we have an image of the right colour space
  50         if ( error == 0 && *format == mlt_image_yuv422 )
  51         {
  52                 // We'll KISS here
  53                 int hh = *height / 2;
  54
  55                 if ( !strcmp( mirror, "horizontal" ) )
  56                 {
  57                         uint8_t *p = NULL;
  58                         uint8_t *q = NULL;
  59                         int i;
  60                         for ( i = 0; i < *height; i ++ )
  61                         {
  62                                 p = ( uint8_t * )*image + i * *width * 2;
  63                                 q = p + *width * 2;
  64                                 if ( !reverse )
  65                                 {
  66                                         while ( p < q )
  67                                         {
  68                                                 *p ++ = *( q - 2 );
  69                                                 *p ++ = *( q - 3 );
  70                                                 *p ++ = *( q - 4 );
  71                                                 *p ++ = *( q - 1 );
  72                                                 q -= 4;
  73                                         }
  74                                 }
  75                                 else
  76                                 {
  77                                         while ( p < q )
  78                                         {
  79                                                 *( q - 2 ) = *p ++;
  80                                                 *( q - 3 ) = *p ++;
  81                                                 *( q - 4 ) = *p ++;
  82                                                 *( q - 1 ) = *p ++;
  83                                                 q -= 4;
  84                                         }
  85                                 }
  86                         }
  87                 }
  88                 else if ( !strcmp( mirror, "vertical" ) )
  89                 {
  90                         uint16_t *end = ( uint16_t *)*image + *width * *height;
  91                         uint16_t *p = NULL;
  92                         uint16_t *q = NULL;
  93                         int i;
  94                         int j;
  95                         for ( i = 0; i < hh; i ++ )
  96                         {
  97                                 p = ( uint16_t * )*image + i * *width;
  98                                 q = end - ( i + 1 ) * *width;
  99                                 j = *width;
 100                                 if ( !reverse )
 101                                 {
 102                                         while ( j -- )
 103                                                 *p ++ = *q ++;
 104                                 }
 105                                 else
 106                                 {
 107                                         while ( j -- )
 108                                                 *q ++ = *p ++;
 109                                 }
 110                         }
 111                 }
 112                 else if ( !strcmp( mirror, "diagonal" ) )
 113                 {
 114                         uint8_t *end = ( uint8_t *)*image + *width * *height * 2;
 115                         uint8_t *p = NULL;
 116                         uint8_t *q = NULL;
 117                         int i;
 118                         int j;
 119                         for ( i = 0; i < *height; i ++ )
 120                         {
 121                                 p = ( uint8_t * )*image + i * *width * 2;
 122                                 q = end - i * *width * 2;
 123                                 j = ( ( *width * ( *height - i ) ) / *height ) / 2;
 124                                 if ( !reverse )
 125                                 {
 126                                         while ( j -- )
 127                                         {
 128                                                 *p ++ = *( q - 2 );
 129                                                 *p ++ = *( q - 3 );
 130                                                 *p ++ = *( q - 4 );
 131                                                 *p ++ = *( q - 1 );
 132                                                 q -= 4;
 133                                         }
 134                                 }
 135                                 else
 136                                 {
 137                                         while ( j -- )
 138                                         {
 139                                                 *( q - 2 ) = *p ++;
 140                                                 *( q - 3 ) = *p ++;
 141                                                 *( q - 4 ) = *p ++;
 142                                                 *( q - 1 ) = *p ++;
 143                                                 q -= 4;
 144                                         }
 145                                 }
 146                         }
 147                 }
 148                 else if ( !strcmp( mirror, "xdiagonal" ) )
 149                 {
 150                         uint8_t *end = ( uint8_t *)*image + *width * *height * 2;
 151                         uint8_t *p = NULL;
 152                         uint8_t *q = NULL;
 153                         int i;
 154                         int j;
 155                         for ( i = 0; i < *height; i ++ )
 156                         {
 157                                 p = ( uint8_t * )*image + ( i + 1 ) * *width * 2;
 158                                 q = end - ( i + 1 ) * *width * 2;
 159                                 j = ( ( *width * ( *height - i ) ) / *height ) / 2;
 160                                 if ( !reverse )
 161                                 {
 162                                         while ( j -- )
 163                                         {
 164                                                 *q ++ = *( p - 2 );
 165                                                 *q ++ = *( p - 3 );
 166                                                 *q ++ = *( p - 4 );
 167                                                 *q ++ = *( p - 1 );
 168                                                 p -= 4;
 169                                         }
 170                                 }
 171                                 else
 172                                 {
 173                                         while ( j -- )
 174                                         {
 175                                                 *( p - 2 ) = *q ++;
 176                                                 *( p - 3 ) = *q ++;
 177                                                 *( p - 4 ) = *q ++;
 178                                                 *( p - 1 ) = *q ++;
 179                                                 p -= 4;
 180                                         }
 181                                 }
 182                         }
 183                 }
 184                 else if ( !strcmp( mirror, "flip" ) )
 185                 {
 186                         uint8_t t[ 4 ];
 187                         uint8_t *p = NULL;
 188                         uint8_t *q = NULL;
 189                         int i;
 190                         for ( i = 0; i < *height; i ++ )
 191                         {
 192                                 p = ( uint8_t * )*image + i * *width * 2;
 193                                 q = p + *width * 2;
 194                                 while ( p < q )
 195                                 {
 196                                         t[ 0 ] = p[ 0 ];
 197                                         t[ 1 ] = p[ 1 ];
 198                                         t[ 2 ] = p[ 2 ];
 199                                         t[ 3 ] = p[ 3 ];
 200                                         *p ++ = *( q - 2 );
 201                                         *p ++ = *( q - 3 );
 202                                         *p ++ = *( q - 4 );
 203                                         *p ++ = *( q - 1 );
 204                                         *( -- q ) = t[ 3 ];
 205                                         *( -- q ) = t[ 0 ];
 206                                         *( -- q ) = t[ 1 ];
 207                                         *( -- q ) = t[ 2 ];
 208                                 }
 209                         }
 210                 }
 211                 else if ( !strcmp( mirror, "flop" ) )
 212                 {
 213                         uint16_t *end = ( uint16_t *)*image + *width * *height;
 214                         uint16_t *p = NULL;
 215                         uint16_t *q = NULL;
 216                         uint16_t t;
 217                         int i;
 218                         int j;
 219                         for ( i = 0; i < hh; i ++ )
 220                         {
 221                                 p = ( uint16_t * )*image + i * *width;
 222                                 q = end - ( i + 1 ) * *width;
 223                                 j = *width;
 224                                 while ( j -- )
 225                                 {
 226                                         t = *p;
 227                                         *p ++ = *q;
 228                                         *q ++ = t;
 229                                 }
 230                         }
 231                 }
 232         }
 233
 234         // Return the error
 235         return error;
 236 }
 237
 238 /** Filter processing.
 239 */
 240
 241 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 242 {
 243         // Push the service on to the stack
 244         mlt_frame_push_service( frame, this );
 245
 246         // Push the filter method on to the stack
 247         mlt_frame_push_service( frame, filter_get_image );
 248
 249         return frame;
 250 }
 251
 252 /** Constructor for the filter.
 253 */
 254
 255 mlt_filter filter_mirror_init( void *arg )
 256 {
 257         // Construct a new filter
 258         mlt_filter this = mlt_filter_new( );
 259
 260         // If we have a filter, initialise it
 261         if ( this != NULL )
 262         {
 263                 // Get the properties
 264                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 265
 266                 // Set the default mirror type
 267                 mlt_properties_set_or_default( properties, "mirror", arg, "horizontal" );
 268
 269                 // Assign the process method
 270                 this->process = filter_process;
 271         }
 272
 273         // Return the filter
 274         return this;
 275 }
 276