libmpcodecs/vf_ivtc.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "config.h"
  24 #include "mp_msg.h"
  25 #include "cpudetect.h"
  26
  27 #include "img_format.h"
  28 #include "mp_image.h"
  29 #include "vf.h"
  30
  31 #include "libvo/fastmemcpy.h"
  32
  33
  34 struct metrics {
  35         /* difference: total, even lines, odd lines */
  36         int d, e, o;
  37         /* noise: temporal, spacial (current), spacial (past) */
  38         int t, s, p;
  39 };
  40
  41 struct frameinfo {
  42         /* peak, relative, mean */
  43         struct metrics p, r, m;
  44 };
  45
  46 struct vf_priv_s {
  47         struct frameinfo fi[2];
  48         mp_image_t *dmpi;
  49         int first;
  50         int drop, lastdrop, dropnext;
  51         int inframes, outframes;
  52 };
  53
  54 enum {
  55         F_DROP,
  56         F_MERGE,
  57         F_NEXT,
  58         F_SHOW
  59 };
  60
  61 #if HAVE_MMX && HAVE_EBX_AVAILABLE
  62 static void block_diffs_MMX(struct metrics *m, unsigned char *old, unsigned char *new, int os, int ns)
  63 {
  64         int i;
  65         short out[24]; // output buffer for the partial metrics from the mmx code
  66
  67         __asm__ (
  68                 "movl $4, %%ecx \n\t"
  69                 "pxor %%mm4, %%mm4 \n\t" // 4 even difference sums
  70                 "pxor %%mm5, %%mm5 \n\t" // 4 odd difference sums
  71                 "pxor %%mm7, %%mm7 \n\t" // all zeros
  72
  73                 ASMALIGN(4)
  74                 "1: \n\t"
  75
  76                 // Even difference
  77                 "movq (%%"REG_S"), %%mm0 \n\t"
  78                 "movq (%%"REG_S"), %%mm2 \n\t"
  79                 "add %%"REG_a", %%"REG_S" \n\t"
  80                 "movq (%%"REG_D"), %%mm1 \n\t"
  81                 "add %%"REG_b", %%"REG_D" \n\t"
  82                 "psubusb %%mm1, %%mm2 \n\t"
  83                 "psubusb %%mm0, %%mm1 \n\t"
  84                 "movq %%mm2, %%mm0 \n\t"
  85                 "movq %%mm1, %%mm3 \n\t"
  86                 "punpcklbw %%mm7, %%mm0 \n\t"
  87                 "punpcklbw %%mm7, %%mm1 \n\t"
  88                 "punpckhbw %%mm7, %%mm2 \n\t"
  89                 "punpckhbw %%mm7, %%mm3 \n\t"
  90                 "paddw %%mm0, %%mm4 \n\t"
  91                 "paddw %%mm1, %%mm4 \n\t"
  92                 "paddw %%mm2, %%mm4 \n\t"
  93                 "paddw %%mm3, %%mm4 \n\t"
  94
  95                 // Odd difference
  96                 "movq (%%"REG_S"), %%mm0 \n\t"
  97                 "movq (%%"REG_S"), %%mm2 \n\t"
  98                 "add %%"REG_a", %%"REG_S" \n\t"
  99                 "movq (%%"REG_D"), %%mm1 \n\t"
 100                 "add %%"REG_b", %%"REG_D" \n\t"
 101                 "psubusb %%mm1, %%mm2 \n\t"
 102                 "psubusb %%mm0, %%mm1 \n\t"
 103                 "movq %%mm2, %%mm0 \n\t"
 104                 "movq %%mm1, %%mm3 \n\t"
 105                 "punpcklbw %%mm7, %%mm0 \n\t"
 106                 "punpcklbw %%mm7, %%mm1 \n\t"
 107                 "punpckhbw %%mm7, %%mm2 \n\t"
 108                 "punpckhbw %%mm7, %%mm3 \n\t"
 109                 "paddw %%mm0, %%mm5 \n\t"
 110                 "paddw %%mm1, %%mm5 \n\t"
 111                 "paddw %%mm2, %%mm5 \n\t"
 112                 "paddw %%mm3, %%mm5 \n\t"
 113
 114                 "decl %%ecx \n\t"
 115                 "jnz 1b \n\t"
 116                 "movq %%mm4, (%%"REG_d") \n\t"
 117                 "movq %%mm5, 8(%%"REG_d") \n\t"
 118                 :
 119                 : "S" (old), "D" (new), "a" (os), "b" (ns), "d" (out)
 120                 : "memory"
 121                 );
 122         m->e = out[0]+out[1]+out[2]+out[3];
 123         m->o = out[4]+out[5]+out[6]+out[7];
 124         m->d = m->e + m->o;
 125
 126         __asm__ (
 127                 // First loop to measure first four columns
 128                 "movl $4, %%ecx \n\t"
 129                 "pxor %%mm4, %%mm4 \n\t" // Past spacial noise
 130                 "pxor %%mm5, %%mm5 \n\t" // Temporal noise
 131                 "pxor %%mm6, %%mm6 \n\t" // Current spacial noise
 132
 133                 ASMALIGN(4)
 134                 "2: \n\t"
 135
 136                 "movq (%%"REG_S"), %%mm0 \n\t"
 137                 "movq (%%"REG_S",%%"REG_a"), %%mm1 \n\t"
 138                 "add %%"REG_a", %%"REG_S" \n\t"
 139                 "add %%"REG_a", %%"REG_S" \n\t"
 140                 "movq (%%"REG_D"), %%mm2 \n\t"
 141                 "movq (%%"REG_D",%%"REG_b"), %%mm3 \n\t"
 142                 "add %%"REG_b", %%"REG_D" \n\t"
 143                 "add %%"REG_b", %%"REG_D" \n\t"
 144                 "punpcklbw %%mm7, %%mm0 \n\t"
 145                 "punpcklbw %%mm7, %%mm1 \n\t"
 146                 "punpcklbw %%mm7, %%mm2 \n\t"
 147                 "punpcklbw %%mm7, %%mm3 \n\t"
 148                 "paddw %%mm1, %%mm4 \n\t"
 149                 "paddw %%mm1, %%mm5 \n\t"
 150                 "paddw %%mm3, %%mm6 \n\t"
 151                 "psubw %%mm0, %%mm4 \n\t"
 152                 "psubw %%mm2, %%mm5 \n\t"
 153                 "psubw %%mm2, %%mm6 \n\t"
 154
 155                 "decl %%ecx \n\t"
 156                 "jnz 2b \n\t"
 157
 158                 "movq %%mm0, %%mm1 \n\t"
 159                 "movq %%mm0, %%mm2 \n\t"
 160                 "movq %%mm0, %%mm3 \n\t"
 161                 "pcmpgtw %%mm4, %%mm1 \n\t"
 162                 "pcmpgtw %%mm5, %%mm2 \n\t"
 163                 "pcmpgtw %%mm6, %%mm3 \n\t"
 164                 "pxor %%mm1, %%mm4 \n\t"
 165                 "pxor %%mm2, %%mm5 \n\t"
 166                 "pxor %%mm3, %%mm6 \n\t"
 167                 "psubw %%mm1, %%mm4 \n\t"
 168                 "psubw %%mm2, %%mm5 \n\t"
 169                 "psubw %%mm3, %%mm6 \n\t"
 170                 "movq %%mm4, (%%"REG_d") \n\t"
 171                 "movq %%mm5, 16(%%"REG_d") \n\t"
 172                 "movq %%mm6, 32(%%"REG_d") \n\t"
 173
 174                 "mov %%"REG_a", %%"REG_c" \n\t"
 175                 "shl $3, %%"REG_c" \n\t"
 176                 "sub %%"REG_c", %%"REG_S" \n\t"
 177                 "mov %%"REG_b", %%"REG_c" \n\t"
 178                 "shl $3, %%"REG_c" \n\t"
 179                 "sub %%"REG_c", %%"REG_D" \n\t"
 180
 181                 // Second loop for the last four columns
 182                 "movl $4, %%ecx \n\t"
 183                 "pxor %%mm4, %%mm4 \n\t"
 184                 "pxor %%mm5, %%mm5 \n\t"
 185                 "pxor %%mm6, %%mm6 \n\t"
 186
 187                 ASMALIGN(4)
 188                 "3: \n\t"
 189
 190                 "movq (%%"REG_S"), %%mm0 \n\t"
 191                 "movq (%%"REG_S",%%"REG_a"), %%mm1 \n\t"
 192                 "add %%"REG_a", %%"REG_S" \n\t"
 193                 "add %%"REG_a", %%"REG_S" \n\t"
 194                 "movq (%%"REG_D"), %%mm2 \n\t"
 195                 "movq (%%"REG_D",%%"REG_b"), %%mm3 \n\t"
 196                 "add %%"REG_b", %%"REG_D" \n\t"
 197                 "add %%"REG_b", %%"REG_D" \n\t"
 198                 "punpckhbw %%mm7, %%mm0 \n\t"
 199                 "punpckhbw %%mm7, %%mm1 \n\t"
 200                 "punpckhbw %%mm7, %%mm2 \n\t"
 201                 "punpckhbw %%mm7, %%mm3 \n\t"
 202                 "paddw %%mm1, %%mm4 \n\t"
 203                 "paddw %%mm1, %%mm5 \n\t"
 204                 "paddw %%mm3, %%mm6 \n\t"
 205                 "psubw %%mm0, %%mm4 \n\t"
 206                 "psubw %%mm2, %%mm5 \n\t"
 207                 "psubw %%mm2, %%mm6 \n\t"
 208
 209                 "decl %%ecx \n\t"
 210                 "jnz 3b \n\t"
 211
 212                 "movq %%mm0, %%mm1 \n\t"
 213                 "movq %%mm0, %%mm2 \n\t"
 214                 "movq %%mm0, %%mm3 \n\t"
 215                 "pcmpgtw %%mm4, %%mm1 \n\t"
 216                 "pcmpgtw %%mm5, %%mm2 \n\t"
 217                 "pcmpgtw %%mm6, %%mm3 \n\t"
 218                 "pxor %%mm1, %%mm4 \n\t"
 219                 "pxor %%mm2, %%mm5 \n\t"
 220                 "pxor %%mm3, %%mm6 \n\t"
 221                 "psubw %%mm1, %%mm4 \n\t"
 222                 "psubw %%mm2, %%mm5 \n\t"
 223                 "psubw %%mm3, %%mm6 \n\t"
 224                 "movq %%mm4, 8(%%"REG_d") \n\t"
 225                 "movq %%mm5, 24(%%"REG_d") \n\t"
 226                 "movq %%mm6, 40(%%"REG_d") \n\t"
 227
 228                 "emms \n\t"
 229                 :
 230                 : "S" (old), "D" (new), "a" ((long)os), "b" ((long)ns), "d" (out)
 231                 : "memory"
 232                 );
 233         m->p = m->t = m->s = 0;
 234         for (i=0; i<8; i++) {
 235                 m->p += out[i];
 236                 m->t += out[8+i];
 237                 m->s += out[16+i];
 238         }
 239         //printf("e=%d o=%d d=%d p=%d t=%d s=%d\n", m->e, m->o, m->d, m->p, m->t, m->s);
 240 }
 241 #endif
 242
 243 //#define MAG(a) ((a)*(a))
 244 //#define MAG(a) (abs(a))
 245 #define MAG(a) (((a)^((a)>>31))-((a)>>31))
 246
 247 //#define LOWPASS(s) (((s)[-2] + 4*(s)[-1] + 6*(s)[0] + 4*(s)[1] + (s)[2])>>4)
 248 //#define LOWPASS(s) (((s)[-1] + 2*(s)[0] + (s)[1])>>2)
 249 #define LOWPASS(s) ((s)[0])
 250
 251
 252 static void block_diffs_C(struct metrics *m, unsigned char *old, unsigned char *new, int os, int ns)
 253 {
 254         int x, y, e=0, o=0, s=0, p=0, t=0;
 255         unsigned char *oldp, *newp;
 256         m->s = m->p = m->t = 0;
 257         for (x = 8; x; x--) {
 258                 oldp = old++;
 259                 newp = new++;
 260                 s = p = t = 0;
 261                 for (y = 4; y; y--) {
 262                         e += MAG(newp[0]-oldp[0]);
 263                         o += MAG(newp[ns]-oldp[os]);
 264                         s += newp[ns]-newp[0];
 265                         p += oldp[os]-oldp[0];
 266                         t += oldp[os]-newp[0];
 267                         oldp += os<<1;
 268                         newp += ns<<1;
 269                 }
 270                 m->s += MAG(s);
 271                 m->p += MAG(p);
 272                 m->t += MAG(t);
 273         }
 274         m->e = e;
 275         m->o = o;
 276         m->d = e+o;
 277 }
 278
 279 static void (*block_diffs)(struct metrics *, unsigned char *, unsigned char *, int, int);
 280
 281 #define MAXUP(a,b) ((a) = ((a)>(b)) ? (a) : (b))
 282
 283 static void diff_planes(struct frameinfo *fi,
 284         unsigned char *old, unsigned char *new, int w, int h, int os, int ns)
 285 {
 286         int x, y;
 287         struct metrics l;
 288         struct metrics *peak=&fi->p, *rel=&fi->r, *mean=&fi->m;
 289         memset(peak, 0, sizeof(struct metrics));
 290         memset(rel, 0, sizeof(struct metrics));
 291         memset(mean, 0, sizeof(struct metrics));
 292         for (y = 0; y < h-7; y += 8) {
 293                 for (x = 8; x < w-8-7; x += 8) {
 294                         block_diffs(&l, old+x+y*os, new+x+y*ns, os, ns);
 295                         mean->d += l.d;
 296                         mean->e += l.e;
 297                         mean->o += l.o;
 298                         mean->s += l.s;
 299                         mean->p += l.p;
 300                         mean->t += l.t;
 301                         MAXUP(peak->d, l.d);
 302                         MAXUP(peak->e, l.e);
 303                         MAXUP(peak->o, l.o);
 304                         MAXUP(peak->s, l.s);
 305                         MAXUP(peak->p, l.p);
 306                         MAXUP(peak->t, l.t);
 307                         MAXUP(rel->e, l.e-l.o);
 308                         MAXUP(rel->o, l.o-l.e);
 309                         MAXUP(rel->s, l.s-l.t);
 310                         MAXUP(rel->p, l.p-l.t);
 311                         MAXUP(rel->t, l.t-l.p);
 312                         MAXUP(rel->d, l.t-l.s); /* hack */
 313                 }
 314         }
 315         x = (w/8-2)*(h/8);
 316         mean->d /= x;
 317         mean->e /= x;
 318         mean->o /= x;
 319         mean->s /= x;
 320         mean->p /= x;
 321         mean->t /= x;
 322 }
 323
 324 static void diff_fields(struct frameinfo *fi, mp_image_t *old, mp_image_t *new)
 325 {
 326         diff_planes(fi, old->planes[0], new->planes[0],
 327                 new->w, new->h, old->stride[0], new->stride[0]);
 328 }
 329
 330 static void stats(struct frameinfo *f)
 331 {
 332         mp_msg(MSGT_VFILTER, MSGL_V, "       pd=%d re=%d ro=%d rp=%d rt=%d rs=%d rd=%d pp=%d pt=%d ps=%d\r",
 333                 f->p.d, f->r.e, f->r.o, f->r.p, f->r.t, f->r.s, f->r.d, f->p.p, f->p.t, f->p.s);
 334 }
 335
 336 static int foo(struct vf_priv_s *p, mp_image_t *new, mp_image_t *cur)
 337 {
 338         struct frameinfo *f = p->fi;
 339
 340         f[0] = f[1];
 341         diff_fields(&f[1], cur, new);
 342         stats(&f[1]);
 343
 344         // Immediately drop this frame if it's already been used.
 345         if (p->dropnext) {
 346                 p->dropnext = 0;
 347                 return F_DROP;
 348         }
 349
 350         // Sometimes a pulldown frame comes all by itself, so both
 351         // its top and bottom field are duplicates from the adjacent
 352         // two frames. We can just drop such a frame, but we
 353         // immediately show the next frame instead to keep the frame
 354         // drops evenly spaced during normal 3:2 pulldown sequences.
 355         if ((3*f[1].r.o < f[1].r.e) && (f[1].r.s < f[1].r.d)) {
 356                 p->dropnext = 1;
 357                 return F_NEXT;
 358         }
 359
 360         // If none of these conditions hold, we will consider the frame
 361         // progressive and just show it as-is.
 362         if (!(  (3*f[0].r.e < f[0].r.o) ||
 363                 ((2*f[0].r.d < f[0].r.s) && (f[0].r.s > 1200)) ||
 364                 ((2*f[1].r.t < f[1].r.p) && (f[1].r.p > 1200))  ))
 365                 return F_SHOW;
 366
 367         // Otherwise, we have to decide whether to merge or drop.
 368         // If the noise metric only increases minimally, we're off
 369         // to a good start...
 370         if (((2*f[1].r.t < 3*f[1].r.p) && (f[1].r.t < 3600)) ||
 371                 (f[1].r.t < 900) || (f[1].r.d < 900)) {
 372                 // ...and if noise decreases or the duplicate even field
 373                 // is detected, we go ahead with the merge.
 374                 if ((3*f[0].r.e < f[0].r.o) || (2*f[1].r.t < f[1].r.p)) {
 375                         p->dropnext = 1;
 376                         return F_MERGE;
 377                 }
 378         }
 379         return F_DROP;
 380 }
 381
 382
 383
 384 static void copy_image(mp_image_t *dmpi, mp_image_t *mpi, int field)
 385 {
 386         switch (field) {
 387         case 0:
 388                 my_memcpy_pic(dmpi->planes[0], mpi->planes[0], mpi->w, mpi->h/2,
 389                         dmpi->stride[0]*2, mpi->stride[0]*2);
 390                 if (mpi->flags & MP_IMGFLAG_PLANAR) {
 391                         my_memcpy_pic(dmpi->planes[1], mpi->planes[1],
 392                                 mpi->chroma_width, mpi->chroma_height/2,
 393                                 dmpi->stride[1]*2, mpi->stride[1]*2);
 394                         my_memcpy_pic(dmpi->planes[2], mpi->planes[2],
 395                                 mpi->chroma_width, mpi->chroma_height/2,
 396                                 dmpi->stride[2]*2, mpi->stride[2]*2);
 397                 }
 398                 break;
 399         case 1:
 400                 my_memcpy_pic(dmpi->planes[0]+dmpi->stride[0],
 401                         mpi->planes[0]+mpi->stride[0], mpi->w, mpi->h/2,
 402                         dmpi->stride[0]*2, mpi->stride[0]*2);
 403                 if (mpi->flags & MP_IMGFLAG_PLANAR) {
 404                         my_memcpy_pic(dmpi->planes[1]+dmpi->stride[1],
 405                                 mpi->planes[1]+mpi->stride[1],
 406                                 mpi->chroma_width, mpi->chroma_height/2,
 407                                 dmpi->stride[1]*2, mpi->stride[1]*2);
 408                         my_memcpy_pic(dmpi->planes[2]+dmpi->stride[2],
 409                                 mpi->planes[2]+mpi->stride[2],
 410                                 mpi->chroma_width, mpi->chroma_height/2,
 411                                 dmpi->stride[2]*2, mpi->stride[2]*2);
 412                 }
 413                 break;
 414         case 2:
 415                 memcpy_pic(dmpi->planes[0], mpi->planes[0], mpi->w, mpi->h,
 416                         dmpi->stride[0], mpi->stride[0]);
 417                 if (mpi->flags & MP_IMGFLAG_PLANAR) {
 418                         memcpy_pic(dmpi->planes[1], mpi->planes[1],
 419                                 mpi->chroma_width, mpi->chroma_height,
 420                                 dmpi->stride[1], mpi->stride[1]);
 421                         memcpy_pic(dmpi->planes[2], mpi->planes[2],
 422                                 mpi->chroma_width, mpi->chroma_height,
 423                                 dmpi->stride[2], mpi->stride[2]);
 424                 }
 425                 break;
 426         }
 427 }
 428
 429 static int do_put_image(struct vf_instance *vf, mp_image_t *dmpi)
 430 {
 431         struct vf_priv_s *p = vf->priv;
 432         int dropflag=0;
 433
 434         if (!p->dropnext) switch (p->drop) {
 435         case 0:
 436                 dropflag = 0;
 437                 break;
 438         case 1:
 439                 dropflag = (++p->lastdrop >= 5);
 440                 break;
 441         case 2:
 442                 dropflag = (++p->lastdrop >= 5) && (4*p->inframes <= 5*p->outframes);
 443                 break;
 444         }
 445
 446         if (dropflag) {
 447                 //mp_msg(MSGT_VFILTER, MSGL_V, "drop! [%d/%d=%g]\n",
 448                 //      p->outframes, p->inframes, (float)p->outframes/p->inframes);
 449                 mp_msg(MSGT_VFILTER, MSGL_V, "!");
 450                 p->lastdrop = 0;
 451                 return 0;
 452         }
 453
 454         p->outframes++;
 455         return vf_next_put_image(vf, dmpi, MP_NOPTS_VALUE);
 456 }
 457
 458 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
 459 {
 460         int ret=0;
 461         struct vf_priv_s *p = vf->priv;
 462
 463         p->inframes++;
 464
 465         if (p->first) { /* hack */
 466                 p->first = 0;
 467                 return 1;
 468         }
 469
 470         if (!p->dmpi) p->dmpi = vf_get_image(vf->next, mpi->imgfmt,
 471                 MP_IMGTYPE_STATIC, MP_IMGFLAG_ACCEPT_STRIDE |
 472                 MP_IMGFLAG_PRESERVE | MP_IMGFLAG_READABLE,
 473                 mpi->width, mpi->height);
 474         /* FIXME -- not correct, off by one frame! */
 475         p->dmpi->qscale = mpi->qscale;
 476         p->dmpi->qstride = mpi->qstride;
 477         p->dmpi->qscale_type = mpi->qscale_type;
 478
 479         switch (foo(p, mpi, p->dmpi)) {
 480         case F_DROP:
 481                 copy_image(p->dmpi, mpi, 2);
 482                 ret = 0;
 483                 p->lastdrop = 0;
 484                 mp_msg(MSGT_VFILTER, MSGL_V, "DROP\n");
 485                 break;
 486         case F_MERGE:
 487                 copy_image(p->dmpi, mpi, 0);
 488                 ret = do_put_image(vf, p->dmpi);
 489                 copy_image(p->dmpi, mpi, 1);
 490                 mp_msg(MSGT_VFILTER, MSGL_V, "MERGE\n");
 491                 p->dmpi = NULL;
 492                 break;
 493         case F_NEXT:
 494                 copy_image(p->dmpi, mpi, 2);
 495                 ret = do_put_image(vf, p->dmpi);
 496                 mp_msg(MSGT_VFILTER, MSGL_V, "NEXT\n");
 497                 p->dmpi = NULL;
 498                 break;
 499         case F_SHOW:
 500                 ret = do_put_image(vf, p->dmpi);
 501                 copy_image(p->dmpi, mpi, 2);
 502                 mp_msg(MSGT_VFILTER, MSGL_V, "OK\n");
 503                 p->dmpi = NULL;
 504                 break;
 505         }
 506         return ret;
 507 }
 508
 509 static int query_format(struct vf_instance *vf, unsigned int fmt)
 510 {
 511         switch (fmt) {
 512         case IMGFMT_YV12:
 513         case IMGFMT_IYUV:
 514         case IMGFMT_I420:
 515                 return vf_next_query_format(vf, fmt);
 516         }
 517         return 0;
 518 }
 519
 520 static void uninit(struct vf_instance *vf)
 521 {
 522         free(vf->priv);
 523 }
 524
 525 static int vf_open(vf_instance_t *vf, char *args)
 526 {
 527         struct vf_priv_s *p;
 528         vf->put_image = put_image;
 529         vf->query_format = query_format;
 530         vf->uninit = uninit;
 531         vf->default_reqs = VFCAP_ACCEPT_STRIDE;
 532         vf->priv = p = calloc(1, sizeof(struct vf_priv_s));
 533         p->drop = 0;
 534         p->first = 1;
 535         if (args) sscanf(args, "%d", &p->drop);
 536         block_diffs = block_diffs_C;
 537 #if HAVE_MMX && HAVE_EBX_AVAILABLE
 538         if(gCpuCaps.hasMMX) block_diffs = block_diffs_MMX;
 539 #endif
 540         return 1;
 541 }
 542
 543 const vf_info_t vf_info_ivtc = {
 544     "inverse telecine, take 2",
 545     "ivtc",
 546     "Rich Felker",
 547     "",
 548     vf_open,
 549     NULL
 550 };