research.m1stereo.tv/gitweb/ - melted/blob - src/modules/plus/filter_invert.c

   1 /*
   2  * filter_invert.c -- invert 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_invert.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <math.h>
  28
  29 /** Do it :-).
  30 */
  31
  32 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  33 {
  34         // Get the image
  35         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  36
  37         // Only process if we have no error and a valid colour space
  38         if ( error == 0 && *format == mlt_image_yuv422 )
  39         {
  40                 uint8_t *p = *image;
  41                 uint8_t *q = *image + *width * *height * 2;
  42                 uint8_t *r = *image;
  43
  44                 while ( p != q )
  45                 {
  46                         *p ++ = 251 - *r ++;
  47                         *p ++ = 251 - *r ++;
  48                 }
  49         }
  50
  51         return error;
  52 }
  53
  54 /** Filter processing.
  55 */
  56
  57 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  58 {
  59         // Push the frame filter
  60         mlt_frame_push_get_image( frame, filter_get_image );
  61         return frame;
  62 }
  63
  64 /** Constructor for the filter.
  65 */
  66
  67 mlt_filter filter_invert_init( char *arg )
  68 {
  69         mlt_filter this = mlt_filter_new( );
  70         if ( this != NULL )
  71                 this->process = filter_process;
  72         return this;
  73 }
  74