libmpcodecs/vf_phase.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <limits.h>
   5
   6 #include "config.h"
   7 #include "mp_msg.h"
   8
   9 #include "img_format.h"
  10 #include "mp_image.h"
  11 #include "vf.h"
  12
  13 #include "libvo/fastmemcpy.h"
  14
  15 enum mode { PROGRESSIVE, TOP_FIRST, BOTTOM_FIRST,
  16             TOP_FIRST_ANALYZE, BOTTOM_FIRST_ANALYZE,
  17             ANALYZE, FULL_ANALYZE, AUTO, AUTO_ANALYZE };
  18
  19 #define fixed_mode(p) ((p)<=BOTTOM_FIRST)
  20
  21 struct vf_priv_s
  22    {
  23    enum mode mode;
  24    int verbose;
  25    unsigned char *buf[3];
  26    };
  27
  28 /*
  29  * Copy fields from either current or buffered previous frame to the
  30  * output and store the current frame unmodified to the buffer.
  31  */
  32
  33 static void do_plane(unsigned char *to, unsigned char *from,
  34                      int w, int h, int ts, int fs,
  35                      unsigned char **bufp, enum mode mode)
  36    {
  37    unsigned char *buf, *end;
  38    int top;
  39
  40    if(!*bufp)
  41       {
  42       mode=PROGRESSIVE;
  43       if(!(*bufp=malloc(h*w))) return;
  44       }
  45
  46    for(end=to+h*ts, buf=*bufp, top=1; to<end; from+=fs, to+=ts, buf+=w, top^=1)
  47       {
  48       fast_memcpy(to, mode==(top?BOTTOM_FIRST:TOP_FIRST)?buf:from, w);
  49       fast_memcpy(buf, from, w);
  50       }
  51    }
  52
  53 /*
  54  * This macro interpolates the value of both fields at a point halfway
  55  * between lines and takes the squared difference. In field resolution
  56  * the point is a quarter pixel below a line in one field and a quarter
  57  * pixel above a line in other.
  58  *
  59  * (the result is actually multiplied by 25)
  60  */
  61
  62 #define diff(a, as, b, bs) (t=((*a-b[bs])<<2)+a[as<<1]-b[-bs], t*t)
  63
  64 /*
  65  * Find which field combination has the smallest average squared difference
  66  * between the fields.
  67  */
  68
  69 static enum mode analyze_plane(unsigned char *old, unsigned char *new,
  70                                int w, int h, int os, int ns, enum mode mode,
  71                                int verbose, int fields)
  72    {
  73    double bdiff, pdiff, tdiff, scale;
  74    int bdif, tdif, pdif;
  75    int top, t;
  76    unsigned char *end, *rend;
  77
  78    if(mode==AUTO)
  79       mode=fields&MP_IMGFIELD_ORDERED?fields&MP_IMGFIELD_TOP_FIRST?
  80          TOP_FIRST:BOTTOM_FIRST:PROGRESSIVE;
  81    else if(mode==AUTO_ANALYZE)
  82       mode=fields&MP_IMGFIELD_ORDERED?fields&MP_IMGFIELD_TOP_FIRST?
  83          TOP_FIRST_ANALYZE:BOTTOM_FIRST_ANALYZE:FULL_ANALYZE;
  84
  85    if(fixed_mode(mode))
  86       bdiff=pdiff=tdiff=65536.0;
  87    else
  88       {
  89       bdiff=pdiff=tdiff=0.0;
  90
  91       for(end=new+(h-2)*ns, new+=ns, old+=os, top=0;
  92           new<end; new+=ns-w, old+=os-w, top^=1)
  93          {
  94          pdif=tdif=bdif=0;
  95
  96          switch(mode)
  97             {
  98             case TOP_FIRST_ANALYZE:
  99                if(top)
 100                   for(rend=new+w; new<rend; new++, old++)
 101                      pdif+=diff(new, ns, new, ns),
 102                      tdif+=diff(new, ns, old, os);
 103                else
 104                   for(rend=new+w; new<rend; new++, old++)
 105                      pdif+=diff(new, ns, new, ns),
 106                      tdif+=diff(old, os, new, ns);
 107                break;
 108
 109             case BOTTOM_FIRST_ANALYZE:
 110                if(top)
 111                   for(rend=new+w; new<rend; new++, old++)
 112                      pdif+=diff(new, ns, new, ns),
 113                      bdif+=diff(old, os, new, ns);
 114                else
 115                   for(rend=new+w; new<rend; new++, old++)
 116                      pdif+=diff(new, ns, new, ns),
 117                      bdif+=diff(new, ns, old, os);
 118                break;
 119
 120             case ANALYZE:
 121                if(top)
 122                   for(rend=new+w; new<rend; new++, old++)
 123                      tdif+=diff(new, ns, old, os),
 124                      bdif+=diff(old, os, new, ns);
 125                else
 126                   for(rend=new+w; new<rend; new++, old++)
 127                      bdif+=diff(new, ns, old, os),
 128                      tdif+=diff(old, os, new, ns);
 129                break;
 130
 131             default: /* FULL_ANALYZE */
 132                if(top)
 133                   for(rend=new+w; new<rend; new++, old++)
 134                      pdif+=diff(new, ns, new, ns),
 135                      tdif+=diff(new, ns, old, os),
 136                      bdif+=diff(old, os, new, ns);
 137                else
 138                   for(rend=new+w; new<rend; new++, old++)
 139                      pdif+=diff(new, ns, new, ns),
 140                      bdif+=diff(new, ns, old, os),
 141                      tdif+=diff(old, os, new, ns);
 142             }
 143
 144          pdiff+=(double)pdif;
 145          tdiff+=(double)tdif;
 146          bdiff+=(double)bdif;
 147          }
 148
 149       scale=1.0/(w*(h-3))/25.0;
 150       pdiff*=scale;
 151       tdiff*=scale;
 152       bdiff*=scale;
 153
 154       if(mode==TOP_FIRST_ANALYZE)
 155          bdiff=65536.0;
 156       else if(mode==BOTTOM_FIRST_ANALYZE)
 157          tdiff=65536.0;
 158       else if(mode==ANALYZE)
 159          pdiff=65536.0;
 160
 161       if(bdiff<pdiff && bdiff<tdiff)
 162          mode=BOTTOM_FIRST;
 163       else if(tdiff<pdiff && tdiff<bdiff)
 164          mode=TOP_FIRST;
 165       else
 166          mode=PROGRESSIVE;
 167       }
 168
 169    if( mp_msg_test(MSGT_VFILTER,MSGL_V) )
 170       {
 171       mp_msg(MSGT_VFILTER, MSGL_INFO, "%c", mode==BOTTOM_FIRST?'b':mode==TOP_FIRST?'t':'p');
 172       if(tdiff==65536.0) mp_msg(MSGT_VFILTER, MSGL_INFO,"     N/A "); else mp_msg(MSGT_VFILTER, MSGL_INFO," %8.2f", tdiff);
 173       if(bdiff==65536.0) mp_msg(MSGT_VFILTER, MSGL_INFO,"     N/A "); else mp_msg(MSGT_VFILTER, MSGL_INFO," %8.2f", bdiff);
 174       if(pdiff==65536.0) mp_msg(MSGT_VFILTER, MSGL_INFO,"     N/A "); else mp_msg(MSGT_VFILTER, MSGL_INFO," %8.2f", pdiff);
 175       mp_msg(MSGT_VFILTER, MSGL_INFO,"        \n");
 176       }
 177
 178    return mode;
 179    }
 180
 181 static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts)
 182    {
 183    mp_image_t *dmpi;
 184    int w;
 185    enum mode mode;
 186
 187    if(!(dmpi=vf_get_image(vf->next, mpi->imgfmt,
 188                           MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
 189                           mpi->w, mpi->h)))
 190       return 0;
 191
 192    w=dmpi->w;
 193    if(!(dmpi->flags&MP_IMGFLAG_PLANAR))
 194       w*=dmpi->bpp/8;
 195
 196    mode=vf->priv->mode;
 197
 198    if(!vf->priv->buf[0])
 199       mode=PROGRESSIVE;
 200    else
 201       mode=analyze_plane(vf->priv->buf[0], mpi->planes[0],
 202                          w, dmpi->h, w, mpi->stride[0], mode,
 203                          vf->priv->verbose, mpi->fields);
 204
 205    do_plane(dmpi->planes[0], mpi->planes[0],
 206             w, dmpi->h,
 207             dmpi->stride[0], mpi->stride[0],
 208             &vf->priv->buf[0], mode);
 209
 210    if(dmpi->flags&MP_IMGFLAG_PLANAR)
 211       {
 212       do_plane(dmpi->planes[1], mpi->planes[1],
 213                dmpi->chroma_width, dmpi->chroma_height,
 214                dmpi->stride[1], mpi->stride[1],
 215                &vf->priv->buf[1], mode);
 216       do_plane(dmpi->planes[2], mpi->planes[2],
 217                dmpi->chroma_width, dmpi->chroma_height,
 218                dmpi->stride[2], mpi->stride[2],
 219                &vf->priv->buf[2], mode);
 220       }
 221
 222    return vf_next_put_image(vf, dmpi, MP_NOPTS_VALUE);
 223    }
 224
 225 static void uninit(struct vf_instance_s* vf)
 226    {
 227    free(vf->priv->buf[0]);
 228    free(vf->priv->buf[1]);
 229    free(vf->priv->buf[2]);
 230    free(vf->priv);
 231    }
 232
 233 static int open(vf_instance_t *vf, char* args)
 234    {
 235    vf->put_image = put_image;
 236    vf->uninit = uninit;
 237    vf->default_reqs = VFCAP_ACCEPT_STRIDE;
 238
 239    if(!(vf->priv = calloc(1, sizeof(struct vf_priv_s))))
 240       {
 241       uninit(vf);
 242       return 0;
 243       }
 244
 245    vf->priv->mode=AUTO_ANALYZE;
 246    vf->priv->verbose=0;
 247
 248    while(args && *args)
 249       {
 250       switch(*args)
 251          {
 252          case 't': vf->priv->mode=TOP_FIRST;            break;
 253          case 'a': vf->priv->mode=AUTO;                 break;
 254          case 'b': vf->priv->mode=BOTTOM_FIRST;         break;
 255          case 'u': vf->priv->mode=ANALYZE;              break;
 256          case 'T': vf->priv->mode=TOP_FIRST_ANALYZE;    break;
 257          case 'A': vf->priv->mode=AUTO_ANALYZE;         break;
 258          case 'B': vf->priv->mode=BOTTOM_FIRST_ANALYZE; break;
 259          case 'U': vf->priv->mode=FULL_ANALYZE;         break;
 260          case 'p': vf->priv->mode=PROGRESSIVE;          break;
 261          case 'v': vf->priv->verbose=1;                 break;
 262          case ':': break;
 263
 264          default:
 265             uninit(vf);
 266             return 0; /* bad args */
 267          }
 268
 269       if( (args=strchr(args, ':')) ) args++;
 270       }
 271
 272    return 1;
 273    }
 274
 275 const vf_info_t vf_info_phase =
 276    {
 277    "phase shift fields",
 278    "phase",
 279    "Ville Saari",
 280    "",
 281    open,
 282    NULL
 283    };