research.m1stereo.tv/gitweb/ - melted/blob - src/modules/oldfilm/filter_grain.c

   1 /*
   2  * filter_grain.c -- grain filter
   3  * Copyright (c) 2007 Marco Gittler <g.marco@freenet.de>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include <framework/mlt_filter.h>
  21 #include <framework/mlt_frame.h>
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <math.h>
  26
  27
  28 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  29 {
  30
  31         mlt_filter filter = mlt_frame_pop_service( this );
  32         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  33
  34         if ( error == 0 && *image && *format == mlt_image_yuv422 )
  35         {
  36                 int h = *height;
  37                 int w = *width;
  38
  39                 int noise = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "noise" );
  40                 int x=0,y=0,pix=0;
  41                 for (x=0;x<w;x++)
  42                         for(y=0;y<h;y++){
  43                                 uint8_t* pixel=(*image+(y)*w*2+(x)*2);
  44                                 if (*pixel>20){
  45                                         pix=(*pixel)-(rand()%noise-noise);
  46                                         if (pix>0 && pix<255)
  47                                         *pixel=pix;
  48                                 }
  49                         }
  50
  51         }
  52
  53         return error;
  54 }
  55
  56 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  57 {
  58         mlt_frame_push_service( frame, this );
  59         mlt_frame_push_get_image( frame, filter_get_image );
  60         return frame;
  61 }
  62
  63 mlt_filter filter_grain_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  64 {
  65         mlt_filter this = mlt_filter_new( );
  66         if ( this != NULL )
  67         {
  68                 this->process = filter_process;
  69                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "noise", "40" );
  70         }
  71         return this;
  72 }
  73
  74