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semi regular noise pattern patch by (Jindrich Makovicka <makovick at kmlinux dot fjfi dot cvut dot cz>)

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6991 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2002-08-13 17:53:32 +00:00
parent 408cf7a6bb
commit ca6c71ac5b
2 changed files with 34 additions and 10 deletions
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1
DOCS/tech/vop.txt
View File

@ -161,5 +161,6 @@ Current plugins:
t temporal noise (noise pattern changes between frames)
a averaged temporal (smoother, but a lot slower)
h high quality (slightly better looking, slightly slower)
p mix random noise with a (semi)regular pattern
MPI: DR (if possible) or TEMP, accepts stride

43
libmpcodecs/vf_noise.c
View File

@ -53,6 +53,7 @@ typedef struct FilterParam{
int temporal;
int quality;
int averaged;
int pattern;
int shiftptr;
int8_t *noise;
int8_t *prev_shift[MAX_RES][3];
@ -67,40 +68,60 @@ struct vf_priv_s {
static int nonTempRandShift[MAX_RES]= {-1};
static int patt[4] = {
-1,0,1,0
};
#define RAND_N(range) ((int) ((double)range*rand()/(RAND_MAX+1.0)))
static int8_t *initNoise(FilterParam *fp){
int strength= fp->strength;
int uniform= fp->uniform;
int averaged= fp->averaged;
int pattern= fp->pattern;
int8_t *noise= memalign(16, MAX_NOISE*sizeof(int8_t));
int i, j;
srand(123457);
for(i=0; i<MAX_NOISE; i++)
for(i=0,j=0; i<MAX_NOISE; i++,j++)
{
if(uniform) {
if (averaged) {
noise[i]= (((rand()/11)%strength) - strength/2)/3;
} else {
noise[i]= ((rand()/11)%strength) - strength/2;
}
} else {
if(uniform) {
if (averaged) {
if (pattern) {
noise[i]= (RAND_N(strength) - strength/2)/6
+patt[j%4]*strength*0.25/3;
} else {
noise[i]= (RAND_N(strength) - strength/2)/3;
}
} else {
if (pattern) {
noise[i]= (RAND_N(strength) - strength/2)/2
+ patt[j%4]*strength*0.25;
} else {
noise[i]= RAND_N(strength) - strength/2;
}
}
} else {
double x1, x2, w, y1;
do {
x1 = 2.0 * rand()/(float)RAND_MAX - 1.0;
x2 = 2.0 * rand()/(float)RAND_MAX - 1.0;
w = x1 * x1 + x2 * x2;
} while ( w >= 1.0 );
w = sqrt( (-2.0 * log( w ) ) / w );
y1= x1 * w;
y1*= strength / sqrt(3.0);
if (pattern) {
y1 /= 2;
y1 += patt[j%4]*strength*0.35;
}
if (y1<-128) y1=-128;
else if(y1> 127) y1= 127;
if (averaged) y1 /= 3.0;
noise[i]= (int)y1;
}
if (RAND_N(6) == 0) j--;
}
@ -382,6 +403,8 @@ static void parse(FilterParam *fp, char* args){
if(pos && pos<max) fp->temporal=1;
pos= strchr(args, 'h');
if(pos && pos<max) fp->quality=1;
pos= strchr(args, 'p');
if(pos && pos<max) fp->pattern=1;
pos= strchr(args, 'a');
if(pos && pos<max) {
fp->temporal=1;