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 #define MIN(a,b) (a<b?a:b)
  27 #define MAX(a,b) (a>b?a:b)
  28
  29 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  30 {
  31
  32         mlt_filter filter = mlt_frame_pop_service( this );
  33         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
  34
  35         if ( error == 0 && *image && *format == mlt_image_yuv422 )
  36         {
  37                 int h = *height;
  38                 int w = *width;
  39
  40                 mlt_position in = mlt_filter_get_in( filter );
  41                 mlt_position out = mlt_filter_get_out( filter );
  42                 mlt_position time = mlt_frame_get_position( this );
  43                 double position = ( double )( time - in ) / ( double )( out - in + 1 );
  44                 srand(position*10000);
  45
  46                 int noise = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "noise" );
  47                 double contrast = mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "contrast" )/100.0;
  48                 double brightness = 127.0 * (mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "brightness" )-100.0)/100.0;
  49
  50                 int x=0,y=0,pix=0;
  51                 for (x=0;x<w;x++)
  52                         for(y=0;y<h;y++){
  53                                 uint8_t* pixel=(*image+(y)*w*2+(x)*2);
  54                                 if (*pixel>20){
  55                                         pix= MIN ( MAX ( ( (double)*pixel -127.0  ) * contrast + 127.0 + brightness , 0 ) , 255 ) ;
  56                                         if (noise>0)
  57                                          pix-=(rand()%noise-noise);
  58
  59                                         *pixel= MIN ( MAX ( pix , 0 ) , 255 );
  60                                 }
  61                                 //*(pixel+1)= MIN ( MAX ( ( (double)*(pixel+1) -127.0  ) * .5 + 127.0 , 0 ) , 255 ) ;
  62                         }
  63         }
  64
  65         return error;
  66 }
  67
  68 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
  69 {
  70         mlt_frame_push_service( frame, this );
  71         mlt_frame_push_get_image( frame, filter_get_image );
  72         return frame;
  73 }
  74
  75 mlt_filter filter_grain_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  76 {
  77         mlt_filter this = mlt_filter_new( );
  78         if ( this != NULL )
  79         {
  80                 this->process = filter_process;
  81                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "noise", "40" );
  82                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "contrast", "160" );
  83                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "brightness", "70" );
  84         }
  85         return this;
  86 }
  87