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mpv/libmpcodecs/vf_phase.c

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6.9 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "config.h"
#include "mp_msg.h"
#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
#include "libvo/fastmemcpy.h"
enum mode { PROGRESSIVE, TOP_FIRST, BOTTOM_FIRST,
TOP_FIRST_ANALYZE, BOTTOM_FIRST_ANALYZE,
ANALYZE, FULL_ANALYZE, AUTO, AUTO_ANALYZE };
#define fixed_mode(p) ((p)<=BOTTOM_FIRST)
struct vf_priv_s
{
enum mode mode;
int verbose;
unsigned char *buf[3];
};
/*
* Copy fields from either current or buffered previous frame to the
* output and store the current frame unmodified to the buffer.
*/
static void do_plane(unsigned char *to, unsigned char *from,
int w, int h, int ts, int fs,
unsigned char **bufp, enum mode mode)
{
unsigned char *buf, *end;
int top;
if(!*bufp)
{
mode=PROGRESSIVE;
if(!(*bufp=malloc(h*w))) return;
}
for(end=to+h*ts, buf=*bufp, top=1; to<end; from+=fs, to+=ts, buf+=w, top^=1)
{
memcpy(to, mode==(top?BOTTOM_FIRST:TOP_FIRST)?buf:from, w);
memcpy(buf, from, w);
}
}
/*
* This macro interpolates the value of both fields at a point halfway
* between lines and takes the squared difference. In field resolution
* the point is a quarter pixel below a line in one field and a quarter
* pixel above a line in other.
*
* (the result is actually multiplied by 25)
*/
#define diff(a, as, b, bs) (t=((*a-b[bs])<<2)+a[as<<1]-b[-bs], t*t)
/*
* Find which field combination has the smallest average squared difference
* between the fields.
*/
static enum mode analyze_plane(unsigned char *old, unsigned char *new,
int w, int h, int os, int ns, enum mode mode,
int verbose, int fields)
{
double bdiff, pdiff, tdiff, scale;
int bdif, tdif, pdif;
int top, t;
unsigned char *end, *rend;
if(mode==AUTO)
mode=fields&MP_IMGFIELD_ORDERED?fields&MP_IMGFIELD_TOP_FIRST?
TOP_FIRST:BOTTOM_FIRST:PROGRESSIVE;
else if(mode==AUTO_ANALYZE)
mode=fields&MP_IMGFIELD_ORDERED?fields&MP_IMGFIELD_TOP_FIRST?
TOP_FIRST_ANALYZE:BOTTOM_FIRST_ANALYZE:FULL_ANALYZE;
if(fixed_mode(mode))
bdiff=pdiff=tdiff=65536.0;
else
{
bdiff=pdiff=tdiff=0.0;
for(end=new+(h-2)*ns, new+=ns, old+=os, top=0;
new<end; new+=ns-w, old+=os-w, top^=1)
{
pdif=tdif=bdif=0;
switch(mode)
{
case TOP_FIRST_ANALYZE:
if(top)
for(rend=new+w; new<rend; new++, old++)
pdif+=diff(new, ns, new, ns),
tdif+=diff(new, ns, old, os);
else
for(rend=new+w; new<rend; new++, old++)
pdif+=diff(new, ns, new, ns),
tdif+=diff(old, os, new, ns);
break;
case BOTTOM_FIRST_ANALYZE:
if(top)
for(rend=new+w; new<rend; new++, old++)
pdif+=diff(new, ns, new, ns),
bdif+=diff(old, os, new, ns);
else
for(rend=new+w; new<rend; new++, old++)
pdif+=diff(new, ns, new, ns),
bdif+=diff(new, ns, old, os);
break;
case ANALYZE:
if(top)
for(rend=new+w; new<rend; new++, old++)
tdif+=diff(new, ns, old, os),
bdif+=diff(old, os, new, ns);
else
for(rend=new+w; new<rend; new++, old++)
bdif+=diff(new, ns, old, os),
tdif+=diff(old, os, new, ns);
break;
default: /* FULL_ANALYZE */
if(top)
for(rend=new+w; new<rend; new++, old++)
pdif+=diff(new, ns, new, ns),
tdif+=diff(new, ns, old, os),
bdif+=diff(old, os, new, ns);
else
for(rend=new+w; new<rend; new++, old++)
pdif+=diff(new, ns, new, ns),
bdif+=diff(new, ns, old, os),
tdif+=diff(old, os, new, ns);
}
pdiff+=(double)pdif;
tdiff+=(double)tdif;
bdiff+=(double)bdif;
}
scale=1.0/(w*(h-3))/25.0;
pdiff*=scale;
tdiff*=scale;
bdiff*=scale;
if(mode==TOP_FIRST_ANALYZE)
bdiff=65536.0;
else if(mode==BOTTOM_FIRST_ANALYZE)
tdiff=65536.0;
else if(mode==ANALYZE)
pdiff=65536.0;
if(bdiff<pdiff && bdiff<tdiff)
mode=BOTTOM_FIRST;
else if(tdiff<pdiff && tdiff<bdiff)
mode=TOP_FIRST;
else
mode=PROGRESSIVE;
}
if(verbose)
{
printf("%c", mode==BOTTOM_FIRST?'b':mode==TOP_FIRST?'t':'p');
if(tdiff==65536.0) printf(" N/A "); else printf(" %8.2f", tdiff);
if(bdiff==65536.0) printf(" N/A "); else printf(" %8.2f", bdiff);
if(pdiff==65536.0) printf(" N/A "); else printf(" %8.2f", pdiff);
printf(" \n");
}
return mode;
}
static int put_image(struct vf_instance_s* vf, mp_image_t *mpi)
{
mp_image_t *dmpi;
int w;
enum mode mode;
if(!(dmpi=vf_get_image(vf->next, mpi->imgfmt,
MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
mpi->w, mpi->h)))
return 0;
w=dmpi->w;
if(!(dmpi->flags&MP_IMGFLAG_PLANAR))
w*=dmpi->bpp/8;
mode=vf->priv->mode;
if(!vf->priv->buf[0])
mode=PROGRESSIVE;
else
mode=analyze_plane(vf->priv->buf[0], mpi->planes[0],
w, dmpi->h, w, mpi->stride[0], mode,
vf->priv->verbose, mpi->fields);
do_plane(dmpi->planes[0], mpi->planes[0],
w, dmpi->h,
dmpi->stride[0], mpi->stride[0],
&vf->priv->buf[0], mode);
if(dmpi->flags&MP_IMGFLAG_PLANAR)
{
do_plane(dmpi->planes[1], mpi->planes[1],
dmpi->chroma_width, dmpi->chroma_height,
dmpi->stride[1], mpi->stride[1],
&vf->priv->buf[1], mode);
do_plane(dmpi->planes[2], mpi->planes[2],
dmpi->chroma_width, dmpi->chroma_height,
dmpi->stride[2], mpi->stride[2],
&vf->priv->buf[2], mode);
}
return vf_next_put_image(vf, dmpi);
}
static void uninit(struct vf_instance_s* vf)
{
free(vf->priv->buf[0]);
free(vf->priv->buf[1]);
free(vf->priv->buf[2]);
free(vf->priv);
}
static int open(vf_instance_t *vf, char* args)
{
vf->put_image = put_image;
vf->uninit = uninit;
vf->default_reqs = VFCAP_ACCEPT_STRIDE;
if(!(vf->priv = calloc(1, sizeof(struct vf_priv_s))))
{
uninit(vf);
return 0;
}
vf->priv->mode=AUTO_ANALYZE;
vf->priv->verbose=0;
while(args && *args)
{
switch(*args)
{
case 't': vf->priv->mode=TOP_FIRST; break;
case 'a': vf->priv->mode=AUTO; break;
case 'b': vf->priv->mode=BOTTOM_FIRST; break;
case 'u': vf->priv->mode=ANALYZE; break;
case 'T': vf->priv->mode=TOP_FIRST_ANALYZE; break;
case 'A': vf->priv->mode=AUTO_ANALYZE; break;
case 'B': vf->priv->mode=BOTTOM_FIRST_ANALYZE; break;
case 'U': vf->priv->mode=FULL_ANALYZE; break;
case 'p': vf->priv->mode=PROGRESSIVE; break;
case 'v': vf->priv->verbose=1; break;
case ':': break;
default:
uninit(vf);
return 0; /* bad args */
}
if( (args=strchr(args, ':')) ) args++;
}
return 1;
}
vf_info_t vf_info_phase =
{
"phase shift fields",
"phase",
"Ville Saari",
"",
open,
NULL
};
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