X-Git-Url: http://research.m1stereo.tv/gitweb?a=blobdiff_plain;f=src%2Fmodules%2Foldfilm%2Ffilter_grain.c;h=296da5a89b054bb042f7ecdac58cb5c13664cc41;hb=f4963a6aa07644399b273b5d2b1f9299c9047414;hp=7557dd4079c6cb31d8914a43180e0a5bc51f3c9e;hpb=d33f444d4ef4c7bc4074d07a49eca0ab7d108394;p=melted

diff --git a/src/modules/oldfilm/filter_grain.c b/src/modules/oldfilm/filter_grain.c
index 7557dd4..296da5a 100644
--- a/src/modules/oldfilm/filter_grain.c
+++ b/src/modules/oldfilm/filter_grain.c
@@ -23,7 +23,8 @@
 #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 )
 {
@@ -35,19 +36,30 @@ static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *
 	{
 		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;
@@ -67,8 +79,9 @@ mlt_filter filter_grain_init( mlt_profile profile, mlt_service_type type, const
 	{
 		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;
 }
 
-