#include <stdio.h>
#include <stdlib.h>
#include <math.h>
-
+#define MIN(a,b) (a<b?a:b)
+#define MAX(a,b) (a>b?a:b)
static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
{
{
int h = *height;
int w = *width;
-
+
+ mlt_position in = mlt_filter_get_in( filter );
+ mlt_position out = mlt_filter_get_out( filter );
+ mlt_position time = mlt_frame_get_position( this );
+ double position = ( double )( time - in ) / ( double )( out - in + 1 );
+ srand(position*10000);
+
int noise = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "noise" );
+ double contrast = mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "contrast" )/100.0;
+ double brightness = 127.0 * (mlt_properties_get_double( MLT_FILTER_PROPERTIES( filter ), "brightness" )-100.0)/100.0;
+
int x=0,y=0,pix=0;
for (x=0;x<w;x++)
for(y=0;y<h;y++){
uint8_t* pixel=(*image+(y)*w*2+(x)*2);
if (*pixel>20){
- pix=(*pixel)-(rand()%noise-noise);
- if (pix>0 && pix<255)
- *pixel=pix;
+ pix= MIN ( MAX ( ( (double)*pixel -127.0 ) * contrast + 127.0 + brightness , 0 ) , 255 ) ;
+ if (noise>0)
+ pix-=(rand()%noise-noise);
+
+ *pixel= MIN ( MAX ( pix , 0 ) , 255 );
}
+ //*(pixel+1)= MIN ( MAX ( ( (double)*(pixel+1) -127.0 ) * .5 + 127.0 , 0 ) , 255 ) ;
}
-
}
return error;
{
this->process = filter_process;
mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "noise", "40" );
+ mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "contrast", "160" );
+ mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "brightness", "70" );
}
return this;
}
-