]> git.sesse.net Git - mlt/blob - src/modules/oldfilm/filter_grain.c
Refactor to mlt_filter_get_progress().
[mlt] / 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         *format = mlt_image_yuv422;
34         int error = mlt_frame_get_image( this, image, format, width, height, 1 );
35         
36         if ( error == 0 && *image )
37         {
38                 int h = *height;
39                 int w = *width;
40                 
41                 double position = mlt_filter_get_progress( filter, this );
42                 srand(position*10000);
43                 
44                 int noise = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "noise" );
45                 double contrast = mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "contrast" )/100.0;
46                 double brightness = 127.0 * (mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "brightness" )-100.0)/100.0;
47                 
48                 int x=0,y=0,pix=0;
49                 for (x=0;x<w;x++)
50                         for(y=0;y<h;y++){
51                                 uint8_t* pixel=(*image+(y)*w*2+(x)*2);
52                                 if (*pixel>20){
53                                         pix= MIN ( MAX ( ( (double)*pixel -127.0  ) * contrast + 127.0 + brightness , 0 ) , 255 ) ;
54                                         if (noise>0)
55                                          pix-=(rand()%noise-noise);
56                                         
57                                         *pixel= MIN ( MAX ( pix , 0 ) , 255 );
58                                 }
59                                 //*(pixel+1)= MIN ( MAX ( ( (double)*(pixel+1) -127.0  ) * .5 + 127.0 , 0 ) , 255 ) ;
60                         }
61         }
62
63         return error;
64 }
65
66 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
67 {
68         mlt_frame_push_service( frame, this );
69         mlt_frame_push_get_image( frame, filter_get_image );
70         return frame;
71 }
72
73 mlt_filter filter_grain_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
74 {
75         mlt_filter this = mlt_filter_new( );
76         if ( this != NULL )
77         {
78                 this->process = filter_process;
79                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "noise", "40" );
80                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "contrast", "160" );
81                 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "brightness", "70" );
82         }
83         return this;
84 }
85