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 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 "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 && *image && *format == mlt_image_yuv422 )
  42         {
  43                 // We modify the whole image
  44                 uint8_t *p = *image;
  45                 int h = *height;
  46                 int uneven = *width % 2;
  47                 int w = ( *width - uneven ) / 2;
  48                 int t;
  49
  50                 // Get u and v values
  51                 int u = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "u" );
  52                 int v = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "v" );
  53
  54                 // Loop through image
  55                 while( h -- )
  56                 {
  57                         t = w;
  58                         while( t -- )
  59                         {
  60                                 p ++;
  61                                 *p ++ = u;
  62                                 p ++;
  63                                 *p ++ = v;
  64                         }
  65                         if ( uneven )
  66                         {
  67                                 p ++;
  68                                 *p ++ = u;
  69                         }
  70                 }
  71         }
  72
  73         return error;
  74 }
  75
  76 /** Filter processing.
  77 */
  78
  79 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  80 {
  81         // Push the frame filter
  82         mlt_frame_push_service( frame, this );
  83         mlt_frame_push_get_image( frame, filter_get_image );
  84         return frame;
  85 }
  86
  87 /** Constructor for the filter.
  88 */
  89
  90 mlt_filter filter_sepia_init( char *arg )
  91 {
  92         mlt_filter this = mlt_filter_new( );
  93         if ( this != NULL )
  94         {
  95                 this->process = filter_process;
  96                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "u", "75" );
  97                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "v", "150" );
  98         }
  99         return this;
 100 }
 101