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 int error
= mlt_frame_get_image( this, image
, format
, width
, height
, 1 );
35 if ( error
== 0 && *image
&& *format
== mlt_image_yuv422
)
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);
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;
53 uint8_t* pixel
=(*image
+(y
)*w
*2+(x
)*2);
55 pix
= MIN ( MAX ( ( (double)*pixel
-127.0 ) * contrast
+ 127.0 + brightness
, 0 ) , 255 ) ;
57 pix
-=(rand()%noise
-noise
);
59 *pixel
= MIN ( MAX ( pix
, 0 ) , 255 );
61 //*(pixel+1)= MIN ( MAX ( ( (double)*(pixel+1) -127.0 ) * .5 + 127.0 , 0 ) , 255 ) ;
68 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
70 mlt_frame_push_service( frame
, this );
71 mlt_frame_push_get_image( frame
, filter_get_image
);
75 mlt_filter
filter_grain_init( mlt_profile profile
, mlt_service_type type
, const char *id
, char *arg
)
77 mlt_filter
this = mlt_filter_new( );
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" );