2 * filter_grain.c -- grain filter
3 * Copyright (c) 2007 Marco Gittler <g.marco@freenet.de>
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.
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.
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
20 #include <framework/mlt_filter.h>
21 #include <framework/mlt_frame.h>
26 #define MIN(a,b) (a<b?a:b)
27 #define MAX(a,b) (a>b?a:b)
29 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
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 );
36 if ( error == 0 && *image )
41 double position = mlt_filter_get_progress( filter, this );
42 srand(position*10000);
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;
51 uint8_t* pixel=(*image+(y)*w*2+(x)*2);
53 pix= MIN ( MAX ( ( (double)*pixel -127.0 ) * contrast + 127.0 + brightness , 0 ) , 255 ) ;
55 pix-=(rand()%noise-noise);
57 *pixel= MIN ( MAX ( pix , 0 ) , 255 );
59 //*(pixel+1)= MIN ( MAX ( ( (double)*(pixel+1) -127.0 ) * .5 + 127.0 , 0 ) , 255 ) ;
66 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
68 mlt_frame_push_service( frame, this );
69 mlt_frame_push_get_image( frame, filter_get_image );
73 mlt_filter filter_grain_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
75 mlt_filter this = mlt_filter_new( );
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" );