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

   1 /*
   2  * filter_sepia.c -- sepia 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_sepia.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 filter
  35         mlt_filter filter = mlt_frame_pop_service( this );
  36
  37         // Get the image
  38         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  39
  40         // Only process if we have no error and a valid colour space
  41         if ( error == 0 && *format == mlt_image_yuv422 )
  42         {
  43                 // We modify the whole image
  44                 uint8_t *p = *image;
  45                 uint8_t *q = *image + *height * *width * 2;
  46
  47                 // Get u and v values
  48                 int u = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "u" );
  49                 int v = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "v" );
  50
  51                 // Loop through image
  52                 while ( p != q )
  53                 {
  54                         p ++;
  55                         *p ++ = u;
  56                         p ++;
  57                         *p ++ = v;
  58                 }
  59         }
  60
  61         return error;
  62 }
  63
  64 /** Filter processing.
  65 */
  66
  67 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  68 {
  69         // Push the frame filter
  70         mlt_frame_push_service( frame, this );
  71         mlt_frame_push_get_image( frame, filter_get_image );
  72         return frame;
  73 }
  74
  75 /** Constructor for the filter.
  76 */
  77
  78 mlt_filter filter_sepia_init( char *arg )
  79 {
  80         mlt_filter this = mlt_filter_new( );
  81         if ( this != NULL )
  82         {
  83                 this->process = filter_process;
  84                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "u", "75" );
  85                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "v", "150" );
  86         }
  87         return this;
  88 }
  89