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/*
* vf_eq2.c
*
* LUT-based software equalizer (brightness, contrast, gamma)
*
* Hampa Hug <hhug@student.ethz.ch>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "../config.h"
#include "../mp_msg.h"
#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
#ifdef USE_SETLOCALE
#include <locale.h>
#endif
typedef struct vf_priv_s {
unsigned char *buf;
int buf_w;
int buf_h;
double contrast;
double bright;
double gamma;
unsigned char lut[256];
} vf_eq2_t;
static
void create_lut (vf_eq2_t *eq2)
{
unsigned i;
double c, b, g;
double v;
c = eq2->contrast;
b = eq2->bright;
g = eq2->gamma;
if ((g < 0.001) || (g > 1000.0)) {
g = 1.0;
}
fprintf (stderr, "vf_eq2: c=%.2f b=%.2f g=%.4f\n", c, b, g);
g = 1.0 / g;
for (i = 0; i < 256; i++) {
v = (double) i / 255.0;
v = c * (v - 0.5) + 0.5 + b;
if (v <= 0.0) {
eq2->lut[i] = 0;
}
else {
v = pow (v, g);
if (v >= 1.0) {
eq2->lut[i] = 255;
}
else {
/* we divided by 255.0 so now we also multiply by 255.0, not
by 256.0. "+ 0.5" ensures proper rounding */
eq2->lut[i] = (unsigned char) (255.0 * v + 0.5);
}
}
}
}
/* could inline this */
static
void process (unsigned char *dst, int dstride, unsigned char *src, int sstride,
int w, int h, unsigned char lut[256])
{
int i, j;
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
dst[i] = lut[src[i]];
}
src += sstride;
dst += dstride;
}
}
static
int put_image (vf_instance_t *vf, mp_image_t *src)
{
mp_image_t *dst;
vf_eq2_t *eq2;
eq2 = vf->priv;
if ((eq2->buf == NULL) || (eq2->buf_w != src->stride[0]) || (eq2->buf_h != src->h)) {
eq2->buf = (unsigned char *) realloc (eq2->buf, src->stride[0] * src->h);
eq2->buf_w = src->stride[0];
eq2->buf_h = src->h;
}
dst = vf_get_image (vf->next, src->imgfmt, MP_IMGTYPE_EXPORT, 0, src->w, src->h);
dst->stride[0] = src->stride[0];
dst->stride[1] = src->stride[1];
dst->stride[2] = src->stride[2];
dst->planes[0] = vf->priv->buf;
dst->planes[1] = src->planes[1];
dst->planes[2] = src->planes[2];
process (
dst->planes[0], dst->stride[0], src->planes[0], src->stride[0],
src->w, src->h, eq2->lut
);
return vf_next_put_image (vf, dst);
}
static
int control (vf_instance_t *vf, int request, void *data)
{
vf_equalizer_t *eq;
switch (request) {
case VFCTRL_SET_EQUALIZER:
eq = (vf_equalizer_t *) data;
if (strcmp (eq->item, "gamma") == 0) {
vf->priv->gamma = exp (log (8.0) * eq->value / 100.0);
create_lut (vf->priv);
return CONTROL_TRUE;
}
else if (strcmp (eq->item, "contrast") == 0) {
vf->priv->contrast = (1.0 / 100.0) * (eq->value + 100);
create_lut (vf->priv);
return CONTROL_TRUE;
}
else if (strcmp (eq->item, "brightness") == 0) {
vf->priv->bright = (1.0 / 100.0) * eq->value;
create_lut (vf->priv);
return CONTROL_TRUE;
}
break;
case VFCTRL_GET_EQUALIZER:
eq = (vf_equalizer_t *) data;
if (strcmp (eq->item, "gamma") == 0) {
eq->value = (int) (100.0 * log (vf->priv->gamma) / log (8.0));
return CONTROL_TRUE;
}
else if (strcmp (eq->item, "contrast") == 0) {
eq->value = (int) (100.0 * vf->priv->contrast) - 100;
return CONTROL_TRUE;
}
else if (strcmp (eq->item, "brightness") == 0) {
eq->value = (int) (100.0 * vf->priv->bright);
return CONTROL_TRUE;
}
break;
}
return vf_next_control (vf, request, data);
}
static
int query_format (vf_instance_t *vf, unsigned fmt)
{
switch (fmt) {
case IMGFMT_YVU9:
case IMGFMT_IF09:
case IMGFMT_YV12:
case IMGFMT_I420:
case IMGFMT_IYUV:
case IMGFMT_CLPL:
case IMGFMT_Y800:
case IMGFMT_Y8:
case IMGFMT_NV12:
case IMGFMT_444P:
case IMGFMT_422P:
case IMGFMT_411P:
return vf_next_query_format (vf, fmt);
}
return 0;
}
static
void uninit (vf_instance_t *vf)
{
if (vf->priv != NULL) {
free (vf->priv->buf);
free (vf->priv);
}
}
static
int open (vf_instance_t *vf, char *args)
{
vf_eq2_t *eq2;
vf->control = control;
vf->query_format = query_format;
vf->put_image = put_image;
vf->uninit = uninit;
vf->priv = (vf_eq2_t *) malloc (sizeof (vf_eq2_t));
eq2 = vf->priv;
eq2->buf = NULL;
eq2->buf_w = 0;
eq2->buf_h = 0;
eq2->gamma = 1.0;
eq2->contrast = 1.0;
eq2->bright = 0.0;
if (args != NULL) {
#ifdef USE_SETLOCALE
setlocale( LC_NUMERIC, "C" );
#endif
sscanf (args, "%lf:%lf:%lf", &eq2->gamma, &eq2->contrast, &eq2->bright);
#ifdef USE_SETLOCALE
setlocale( LC_NUMERIC, "" );
#endif
}
create_lut (eq2);
return 1;
}
vf_info_t vf_info_eq2 = {
"LUT-based software equalizer",
"eq2",
"Hampa Hug",
"",
&open
};
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