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mpv/video/filter/vf_noise.c

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/*
* Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>
#include <libavutil/mem.h>
#include "config.h"
#include "common/msg.h"
#include "options/m_option.h"
#include "video/img_format.h"
#include "video/mp_image.h"
#include "vf.h"
#include "video/memcpy_pic.h"
#include "vf_lavfi.h"
#define MAX_NOISE 4096
#define MAX_SHIFT 1024
#define MAX_RES (MAX_NOISE-MAX_SHIFT)
//===========================================================================//
static inline void lineNoise(uint8_t *dst, uint8_t *src, int8_t *noise, int len, int shift);
static inline void lineNoiseAvg(uint8_t *dst, uint8_t *src, int len, int8_t **shift);
typedef struct FilterParam{
int strength;
int uniform;
int temporal;
int quality;
int averaged;
int pattern;
int shiftptr;
int8_t *noise;
int8_t *prev_shift[MAX_RES][3];
int nonTempRandShift[MAX_RES];
}FilterParam;
struct vf_priv_s {
FilterParam lumaParam;
FilterParam chromaParam;
int strength;
int averaged;
int pattern;
int temporal;
int uniform;
int hq;
struct vf_lw_opts *lw_opts;
};
static const 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= av_malloc(MAX_NOISE*sizeof(int8_t));
int i, j;
srand(123457);
for(i=0,j=0; i<MAX_NOISE; i++,j++)
{
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--;
}
for (i = 0; i < MAX_RES; i++)
for (j = 0; j < 3; j++)
fp->prev_shift[i][j] = noise + (rand()&(MAX_SHIFT-1));
for(i=0; i<MAX_RES; i++){
fp->nonTempRandShift[i]= rand()&(MAX_SHIFT-1);
}
fp->noise= noise;
fp->shiftptr= 0;
return noise;
}
/***************************************************************************/
static inline void lineNoise(uint8_t *dst, uint8_t *src, int8_t *noise, int len, int shift){
int i;
noise+= shift;
for(i=0; i<len; i++)
{
int v= src[i]+ noise[i];
if(v>255) dst[i]=255; //FIXME optimize
else if(v<0) dst[i]=0;
else dst[i]=v;
}
}
/***************************************************************************/
static inline void lineNoiseAvg(uint8_t *dst, uint8_t *src, int len, int8_t **shift){
int i;
int8_t *src2= (int8_t*)src;
for(i=0; i<len; i++)
{
const int n= shift[0][i] + shift[1][i] + shift[2][i];
dst[i]= src2[i]+((n*src2[i])>>7);
}
}
/***************************************************************************/
static void donoise(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int width, int height, FilterParam *fp){
int8_t *noise= fp->noise;
int y;
int shift=0;
if(!noise)
{
if(src==dst) return;
if(dstStride==srcStride) memcpy(dst, src, srcStride*height);
else
{
for(y=0; y<height; y++)
{
memcpy(dst, src, width);
dst+= dstStride;
src+= srcStride;
}
}
return;
}
for(y=0; y<height; y++)
{
if(fp->temporal) shift= rand()&(MAX_SHIFT -1);
else shift= fp->nonTempRandShift[y];
if(fp->quality==0) shift&= ~7;
if (fp->averaged) {
lineNoiseAvg(dst, src, width, fp->prev_shift[y]);
fp->prev_shift[y][fp->shiftptr] = noise + shift;
} else {
lineNoise(dst, src, noise, width, shift);
}
dst+= dstStride;
src+= srcStride;
}
fp->shiftptr++;
if (fp->shiftptr == 3) fp->shiftptr = 0;
}
static struct mp_image *filter(struct vf_instance *vf, struct mp_image *mpi)
{
struct mp_image *dmpi = mpi;
if (!mp_image_is_writeable(mpi)) {
dmpi = vf_alloc_out_image(vf);
if (!dmpi)
return NULL;
mp_image_copy_attributes(dmpi, mpi);
}
donoise(dmpi->planes[0], mpi->planes[0], dmpi->stride[0], mpi->stride[0], mpi->w, mpi->h, &vf->priv->lumaParam);
donoise(dmpi->planes[1], mpi->planes[1], dmpi->stride[1], mpi->stride[1], mpi->w/2, mpi->h/2, &vf->priv->chromaParam);
donoise(dmpi->planes[2], mpi->planes[2], dmpi->stride[2], mpi->stride[2], mpi->w/2, mpi->h/2, &vf->priv->chromaParam);
if (dmpi != mpi)
talloc_free(mpi);
return dmpi;
}
static void uninit(struct vf_instance *vf){
if(!vf->priv) return;
av_free(vf->priv->chromaParam.noise);
vf->priv->chromaParam.noise= NULL;
av_free(vf->priv->lumaParam.noise);
vf->priv->lumaParam.noise= NULL;
}
//===========================================================================//
static int query_format(struct vf_instance *vf, unsigned int fmt){
switch(fmt)
{
case IMGFMT_420P:
return vf_next_query_format(vf,IMGFMT_420P);
}
return 0;
}
static void parse(FilterParam *fp, struct vf_priv_s *p){
fp->strength= p->strength;
fp->uniform=p->uniform;
fp->temporal=p->temporal;
fp->quality=p->hq;
fp->pattern=p->pattern;
fp->averaged=p->averaged;
if(fp->strength) initNoise(fp);
}
static int vf_open(vf_instance_t *vf){
vf->filter=filter;
vf->query_format=query_format;
vf->uninit=uninit;
#define CH(f) ((f) ? '+' : '-')
struct vf_priv_s *p = vf->priv;
if (vf_lw_set_graph(vf, p->lw_opts, "noise", "-1:%d:%ca%cp%ct%cu",
p->strength, CH(p->averaged), CH(p->pattern),
CH(p->temporal), CH(p->uniform)) >= 0)
{
return 1;
}
parse(&vf->priv->lumaParam, vf->priv);
parse(&vf->priv->chromaParam, vf->priv);
return 1;
}
#define OPT_BASE_STRUCT struct vf_priv_s
const vf_info_t vf_info_noise = {
.description = "noise generator",
.name = "noise",
.open = vf_open,
.priv_size = sizeof(struct vf_priv_s),
.options = (const struct m_option[]){
OPT_INTRANGE("strength", strength, 0, 0, 100, OPTDEF_INT(2)),
OPT_FLAG("averaged", averaged, 0),
OPT_FLAG("pattern", pattern, 0),
OPT_FLAG("temporal", temporal, 0),
OPT_FLAG("uniform", uniform, 0),
OPT_FLAG("hq", hq, 0),
OPT_SUBSTRUCT("", lw_opts, vf_lw_conf, 0),
{0}
},
};
//===========================================================================//
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