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[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
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