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 <framework/mlt_filter.h>
  22 #include <framework/mlt_frame.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27
  28 /** Do it :-).
  29 */
  30
  31 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  32 {
  33         // Get the filter
  34         mlt_filter filter = mlt_frame_pop_service( this );
  35
  36         // Get the image
  37         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  38
  39         // Only process if we have no error and a valid colour space
  40         if ( error == 0 && *image && *format == mlt_image_yuv422 )
  41         {
  42                 // We modify the whole image
  43                 uint8_t *p = *image;
  44                 int h = *height;
  45                 int uneven = *width % 2;
  46                 int w = ( *width - uneven ) / 2;
  47                 int t;
  48
  49                 // Get u and v values
  50                 int u = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "u" );
  51                 int v = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "v" );
  52
  53                 // Loop through image
  54                 while( h -- )
  55                 {
  56                         t = w;
  57                         while( t -- )
  58                         {
  59                                 p ++;
  60                                 *p ++ = u;
  61                                 p ++;
  62                                 *p ++ = v;
  63                         }
  64                         if ( uneven )
  65                         {
  66                                 p ++;
  67                                 *p ++ = u;
  68                         }
  69                 }
  70         }
  71
  72         return error;
  73 }
  74
  75 /** Filter processing.
  76 */
  77
  78 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  79 {
  80         // Push the frame filter
  81         mlt_frame_push_service( frame, this );
  82         mlt_frame_push_get_image( frame, filter_get_image );
  83         return frame;
  84 }
  85
  86 /** Constructor for the filter.
  87 */
  88
  89 mlt_filter filter_sepia_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  90 {
  91         mlt_filter this = mlt_filter_new( );
  92         if ( this != NULL )
  93         {
  94                 this->process = filter_process;
  95                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "u", "75" );
  96                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "v", "150" );
  97         }
  98         return this;
  99 }
 100