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 * *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, "flip" ) )
 149                 {
 150                         uint8_t t[ 4 ];
 151                         uint8_t *p = NULL;
 152                         uint8_t *q = NULL;
 153                         int i;
 154                         for ( i = 0; i < *height; i ++ )
 155                         {
 156                                 p = ( uint8_t * )*image + i * *width * 2;
 157                                 q = p + *width * 2;
 158                                 while ( p != q )
 159                                 {
 160                                         t[ 0 ] = p[ 0 ];
 161                                         t[ 1 ] = p[ 1 ];
 162                                         t[ 2 ] = p[ 2 ];
 163                                         t[ 3 ] = p[ 3 ];
 164                                         *p ++ = *( q - 2 );
 165                                         *p ++ = *( q - 3 );
 166                                         *p ++ = *( q - 4 );
 167                                         *p ++ = *( q - 1 );
 168                                         *( -- q ) = t[ 3 ];
 169                                         *( -- q ) = t[ 0 ];
 170                                         *( -- q ) = t[ 1 ];
 171                                         *( -- q ) = t[ 2 ];
 172                                 }
 173                         }
 174                 }
 175                 else if ( !strcmp( mirror, "flop" ) )
 176                 {
 177                         uint16_t *end = ( uint16_t *)*image + *width * *height;
 178                         uint16_t *p = NULL;
 179                         uint16_t *q = NULL;
 180                         uint16_t t;
 181                         int i;
 182                         int j;
 183                         for ( i = 0; i < hh; i ++ )
 184                         {
 185                                 p = ( uint16_t * )*image + i * *width;
 186                                 q = end - i * *width;
 187                                 j = *width;
 188                                 while ( j -- )
 189                                 {
 190                                         t = *p;
 191                                         *p ++ = *q;
 192                                         *q ++ = t;
 193                                 }
 194                         }
 195                 }
 196         }
 197
 198         // Return the error
 199         return error;
 200 }
 201
 202 /** Filter processing.
 203 */
 204
 205 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 206 {
 207         // Push the service on to the stack
 208         mlt_frame_push_service( frame, this );
 209
 210         // Push the filter method on to the stack
 211         mlt_frame_push_service( frame, filter_get_image );
 212
 213         return frame;
 214 }
 215
 216 /** Constructor for the filter.
 217 */
 218
 219 mlt_filter filter_mirror_init( void *arg )
 220 {
 221         // Construct a new filter
 222         mlt_filter this = mlt_filter_new( );
 223
 224         // If we have a filter, initialise it
 225         if ( this != NULL )
 226         {
 227                 // Get the properties
 228                 mlt_properties properties = mlt_filter_properties( this );
 229
 230                 // Set the default mirror type
 231                 mlt_properties_set_or_default( properties, "mirror", arg, "horizontal" );
 232
 233                 // Assign the process method
 234                 this->process = filter_process;
 235         }
 236
 237         // Return the filter
 238         return this;
 239 }
 240