libmpcodecs/vf_ivtc.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 #include "config.h"
   6 #include "mp_msg.h"
   7 #include "cpudetect.h"
   8 #include "asmalign.h"
   9
  10 #include "img_format.h"
  11 #include "mp_image.h"
  12 #include "vf.h"
  13
  14 #include "libvo/fastmemcpy.h"
  15
  16
  17 struct metrics {
  18         /* difference: total, even lines, odd lines */
  19         int d, e, o;
  20         /* noise: temporal, spacial (current), spacial (past) */
  21         int t, s, p;
  22 };
  23
  24 struct frameinfo {
  25         /* peak, relative, mean */
  26         struct metrics p, r, m;
  27 };
  28
  29 struct vf_priv_s {
  30         struct frameinfo fi[2];
  31         mp_image_t *dmpi;
  32         int first;
  33         int drop, lastdrop, dropnext;
  34         int inframes, outframes;
  35 };
  36
  37 enum {
  38         F_DROP,
  39         F_MERGE,
  40         F_NEXT,
  41         F_SHOW
  42 };
  43
  44 static inline void *my_memcpy_pic(void * dst, void * src, int bytesPerLine, int height, int dstStride, int srcStride)
  45 {
  46         int i;
  47         void *retval=dst;
  48
  49         for(i=0; i<height; i++)
  50         {
  51                 memcpy(dst, src, bytesPerLine);
  52                 src+= srcStride;
  53                 dst+= dstStride;
  54         }
  55
  56         return retval;
  57 }
  58
  59 #ifdef HAVE_MMX
  60 static void block_diffs_MMX(struct metrics *m, unsigned char *old, unsigned char *new, int os, int ns)
  61 {
  62         int i;
  63         short out[24]; // output buffer for the partial metrics from the mmx code
  64
  65         asm (
  66                 "movl $4, %%ecx \n\t"
  67                 "pxor %%mm4, %%mm4 \n\t" // 4 even difference sums
  68                 "pxor %%mm5, %%mm5 \n\t" // 4 odd difference sums
  69                 "pxor %%mm7, %%mm7 \n\t" // all zeros
  70
  71                 ASMALIGN16
  72                 "1: \n\t"
  73
  74                 // Even difference
  75                 "movq (%%"REG_S"), %%mm0 \n\t"
  76                 "movq (%%"REG_S"), %%mm2 \n\t"
  77                 "add %%"REG_a", %%"REG_S" \n\t"
  78                 "movq (%%"REG_D"), %%mm1 \n\t"
  79                 "add %%"REG_b", %%"REG_D" \n\t"
  80                 "psubusb %%mm1, %%mm2 \n\t"
  81                 "psubusb %%mm0, %%mm1 \n\t"
  82                 "movq %%mm2, %%mm0 \n\t"
  83                 "movq %%mm1, %%mm3 \n\t"
  84                 "punpcklbw %%mm7, %%mm0 \n\t"
  85                 "punpcklbw %%mm7, %%mm1 \n\t"
  86                 "punpckhbw %%mm7, %%mm2 \n\t"
  87                 "punpckhbw %%mm7, %%mm3 \n\t"
  88                 "paddw %%mm0, %%mm4 \n\t"
  89                 "paddw %%mm1, %%mm4 \n\t"
  90                 "paddw %%mm2, %%mm4 \n\t"
  91                 "paddw %%mm3, %%mm4 \n\t"
  92
  93                 // Odd difference
  94                 "movq (%%"REG_S"), %%mm0 \n\t"
  95                 "movq (%%"REG_S"), %%mm2 \n\t"
  96                 "add %%"REG_a", %%"REG_S" \n\t"
  97                 "movq (%%"REG_D"), %%mm1 \n\t"
  98                 "add %%"REG_b", %%"REG_D" \n\t"
  99                 "psubusb %%mm1, %%mm2 \n\t"
 100                 "psubusb %%mm0, %%mm1 \n\t"
 101                 "movq %%mm2, %%mm0 \n\t"
 102                 "movq %%mm1, %%mm3 \n\t"
 103                 "punpcklbw %%mm7, %%mm0 \n\t"
 104                 "punpcklbw %%mm7, %%mm1 \n\t"
 105                 "punpckhbw %%mm7, %%mm2 \n\t"
 106                 "punpckhbw %%mm7, %%mm3 \n\t"
 107                 "paddw %%mm0, %%mm5 \n\t"
 108                 "paddw %%mm1, %%mm5 \n\t"
 109                 "paddw %%mm2, %%mm5 \n\t"
 110                 "paddw %%mm3, %%mm5 \n\t"
 111
 112                 "decl %%ecx \n\t"
 113                 "jnz 1b \n\t"
 114                 "movq %%mm4, (%%"REG_d") \n\t"
 115                 "movq %%mm5, 8(%%"REG_d") \n\t"
 116                 :
 117                 : "S" (old), "D" (new), "a" (os), "b" (ns), "d" (out)
 118                 : "memory"
 119                 );
 120         m->e = out[0]+out[1]+out[2]+out[3];
 121         m->o = out[4]+out[5]+out[6]+out[7];
 122         m->d = m->e + m->o;
 123
 124         asm (
 125                 // First loop to measure first four columns
 126                 "movl $4, %%ecx \n\t"
 127                 "pxor %%mm4, %%mm4 \n\t" // Past spacial noise
 128                 "pxor %%mm5, %%mm5 \n\t" // Temporal noise
 129                 "pxor %%mm6, %%mm6 \n\t" // Current spacial noise
 130
 131                 ASMALIGN16
 132                 "2: \n\t"
 133
 134                 "movq (%%"REG_S"), %%mm0 \n\t"
 135                 "movq (%%"REG_S",%%"REG_a"), %%mm1 \n\t"
 136                 "add %%"REG_a", %%"REG_S" \n\t"
 137                 "add %%"REG_a", %%"REG_S" \n\t"
 138                 "movq (%%"REG_D"), %%mm2 \n\t"
 139                 "movq (%%"REG_D",%%"REG_b"), %%mm3 \n\t"
 140                 "add %%"REG_b", %%"REG_D" \n\t"
 141                 "add %%"REG_b", %%"REG_D" \n\t"
 142                 "punpcklbw %%mm7, %%mm0 \n\t"
 143                 "punpcklbw %%mm7, %%mm1 \n\t"
 144                 "punpcklbw %%mm7, %%mm2 \n\t"
 145                 "punpcklbw %%mm7, %%mm3 \n\t"
 146                 "paddw %%mm1, %%mm4 \n\t"
 147                 "paddw %%mm1, %%mm5 \n\t"
 148                 "paddw %%mm3, %%mm6 \n\t"
 149                 "psubw %%mm0, %%mm4 \n\t"
 150                 "psubw %%mm2, %%mm5 \n\t"
 151                 "psubw %%mm2, %%mm6 \n\t"
 152
 153                 "decl %%ecx \n\t"
 154                 "jnz 2b \n\t"
 155
 156                 "movq %%mm0, %%mm1 \n\t"
 157                 "movq %%mm0, %%mm2 \n\t"
 158                 "movq %%mm0, %%mm3 \n\t"
 159                 "pcmpgtw %%mm4, %%mm1 \n\t"
 160                 "pcmpgtw %%mm5, %%mm2 \n\t"
 161                 "pcmpgtw %%mm6, %%mm3 \n\t"
 162                 "pxor %%mm1, %%mm4 \n\t"
 163                 "pxor %%mm2, %%mm5 \n\t"
 164                 "pxor %%mm3, %%mm6 \n\t"
 165                 "psubw %%mm1, %%mm4 \n\t"
 166                 "psubw %%mm2, %%mm5 \n\t"
 167                 "psubw %%mm3, %%mm6 \n\t"
 168                 "movq %%mm4, (%%"REG_d") \n\t"
 169                 "movq %%mm5, 16(%%"REG_d") \n\t"
 170                 "movq %%mm6, 32(%%"REG_d") \n\t"
 171
 172                 "mov %%"REG_a", %%"REG_c" \n\t"
 173                 "shl $3, %%"REG_c" \n\t"
 174                 "sub %%"REG_c", %%"REG_S" \n\t"
 175                 "mov %%"REG_b", %%"REG_c" \n\t"
 176                 "shl $3, %%"REG_c" \n\t"
 177                 "sub %%"REG_c", %%"REG_D" \n\t"
 178
 179                 // Second loop for the last four columns
 180                 "movl $4, %%ecx \n\t"
 181                 "pxor %%mm4, %%mm4 \n\t"
 182                 "pxor %%mm5, %%mm5 \n\t"
 183                 "pxor %%mm6, %%mm6 \n\t"
 184
 185                 ASMALIGN16
 186                 "3: \n\t"
 187
 188                 "movq (%%"REG_S"), %%mm0 \n\t"
 189                 "movq (%%"REG_S",%%"REG_a"), %%mm1 \n\t"
 190                 "add %%"REG_a", %%"REG_S" \n\t"
 191                 "add %%"REG_a", %%"REG_S" \n\t"
 192                 "movq (%%"REG_D"), %%mm2 \n\t"
 193                 "movq (%%"REG_D",%%"REG_b"), %%mm3 \n\t"
 194                 "add %%"REG_b", %%"REG_D" \n\t"
 195                 "add %%"REG_b", %%"REG_D" \n\t"
 196                 "punpckhbw %%mm7, %%mm0 \n\t"
 197                 "punpckhbw %%mm7, %%mm1 \n\t"
 198                 "punpckhbw %%mm7, %%mm2 \n\t"
 199                 "punpckhbw %%mm7, %%mm3 \n\t"
 200                 "paddw %%mm1, %%mm4 \n\t"
 201                 "paddw %%mm1, %%mm5 \n\t"
 202                 "paddw %%mm3, %%mm6 \n\t"
 203                 "psubw %%mm0, %%mm4 \n\t"
 204                 "psubw %%mm2, %%mm5 \n\t"
 205                 "psubw %%mm2, %%mm6 \n\t"
 206
 207                 "decl %%ecx \n\t"
 208                 "jnz 3b \n\t"
 209
 210                 "movq %%mm0, %%mm1 \n\t"
 211                 "movq %%mm0, %%mm2 \n\t"
 212                 "movq %%mm0, %%mm3 \n\t"
 213                 "pcmpgtw %%mm4, %%mm1 \n\t"
 214                 "pcmpgtw %%mm5, %%mm2 \n\t"
 215                 "pcmpgtw %%mm6, %%mm3 \n\t"
 216                 "pxor %%mm1, %%mm4 \n\t"
 217                 "pxor %%mm2, %%mm5 \n\t"
 218                 "pxor %%mm3, %%mm6 \n\t"
 219                 "psubw %%mm1, %%mm4 \n\t"
 220                 "psubw %%mm2, %%mm5 \n\t"
 221                 "psubw %%mm3, %%mm6 \n\t"
 222                 "movq %%mm4, 8(%%"REG_d") \n\t"
 223                 "movq %%mm5, 24(%%"REG_d") \n\t"
 224                 "movq %%mm6, 40(%%"REG_d") \n\t"
 225
 226                 "emms \n\t"
 227                 :
 228                 : "S" (old), "D" (new), "a" ((long)os), "b" ((long)ns), "d" (out)
 229                 : "memory"
 230                 );
 231         m->p = m->t = m->s = 0;
 232         for (i=0; i<8; i++) {
 233                 m->p += out[i];
 234                 m->t += out[8+i];
 235                 m->s += out[16+i];
 236         }
 237         //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);
 238 }
 239 #endif
 240
 241 //#define MAG(a) ((a)*(a))
 242 //#define MAG(a) (abs(a))
 243 #define MAG(a) (((a)^((a)>>31))-((a)>>31))
 244
 245 //#define LOWPASS(s) (((s)[-2] + 4*(s)[-1] + 6*(s)[0] + 4*(s)[1] + (s)[2])>>4)
 246 //#define LOWPASS(s) (((s)[-1] + 2*(s)[0] + (s)[1])>>2)
 247 #define LOWPASS(s) ((s)[0])
 248
 249
 250 static void block_diffs_C(struct metrics *m, unsigned char *old, unsigned char *new, int os, int ns)
 251 {
 252         int x, y, e=0, o=0, s=0, p=0, t=0;
 253         unsigned char *oldp, *newp;
 254         m->s = m->p = m->t = 0;
 255         for (x = 8; x; x--) {
 256                 oldp = old++;
 257                 newp = new++;
 258                 s = p = t = 0;
 259                 for (y = 4; y; y--) {
 260                         e += MAG(newp[0]-oldp[0]);
 261                         o += MAG(newp[ns]-oldp[os]);
 262                         s += newp[ns]-newp[0];
 263                         p += oldp[os]-oldp[0];
 264                         t += oldp[os]-newp[0];
 265                         oldp += os<<1;
 266                         newp += ns<<1;
 267                 }
 268                 m->s += MAG(s);
 269                 m->p += MAG(p);
 270                 m->t += MAG(t);
 271         }
 272         m->e = e;
 273         m->o = o;
 274         m->d = e+o;
 275 }
 276
 277 static void (*block_diffs)(struct metrics *, unsigned char *, unsigned char *, int, int);
 278
 279 #define MAXUP(a,b) ((a) = ((a)>(b)) ? (a) : (b))
 280
 281 static void diff_planes(struct frameinfo *fi,
 282         unsigned char *old, unsigned char *new, int w, int h, int os, int ns)
 283 {
 284         int x, y;
 285         struct metrics l;
 286         struct metrics *peak=&fi->p, *rel=&fi->r, *mean=&fi->m;
 287         memset(peak, 0, sizeof(struct metrics));
 288         memset(rel, 0, sizeof(struct metrics));
 289         memset(mean, 0, sizeof(struct metrics));
 290         for (y = 0; y < h-7; y += 8) {
 291                 for (x = 8; x < w-8-7; x += 8) {
 292                         block_diffs(&l, old+x+y*os, new+x+y*ns, os, ns);
 293                         mean->d += l.d;
 294                         mean->e += l.e;
 295                         mean->o += l.o;
 296                         mean->s += l.s;
 297                         mean->p += l.p;
 298                         mean->t += l.t;
 299                         MAXUP(peak->d, l.d);
 300                         MAXUP(peak->e, l.e);
 301                         MAXUP(peak->o, l.o);
 302                         MAXUP(peak->s, l.s);
 303                         MAXUP(peak->p, l.p);
 304                         MAXUP(peak->t, l.t);
 305                         MAXUP(rel->e, l.e-l.o);
 306                         MAXUP(rel->o, l.o-l.e);
 307                         MAXUP(rel->s, l.s-l.t);
 308                         MAXUP(rel->p, l.p-l.t);
 309                         MAXUP(rel->t, l.t-l.p);
 310                         MAXUP(rel->d, l.t-l.s); /* hack */
 311                 }
 312         }
 313         x = (w/8-2)*(h/8);
 314         mean->d /= x;
 315         mean->e /= x;
 316         mean->o /= x;
 317         mean->s /= x;
 318         mean->p /= x;
 319         mean->t /= x;
 320 }
 321
 322 static void diff_fields(struct frameinfo *fi, mp_image_t *old, mp_image_t *new)
 323 {
 324         diff_planes(fi, old->planes[0], new->planes[0],
 325                 new->w, new->h, old->stride[0], new->stride[0]);
 326 }
 327
 328 static void stats(struct frameinfo *f)
 329 {
 330         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",
 331                 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);
 332 }
 333
 334 static int foo(struct vf_priv_s *p, mp_image_t *new, mp_image_t *cur)
 335 {
 336         struct frameinfo *f = p->fi;
 337
 338         f[0] = f[1];
 339         diff_fields(&f[1], cur, new);
 340         stats(&f[1]);
 341
 342         // Immediately drop this frame if it's already been used.
 343         if (p->dropnext) {
 344                 p->dropnext = 0;
 345                 return F_DROP;
 346         }
 347
 348         // Sometimes a pulldown frame comes all by itself, so both
 349         // its top and bottom field are duplicates from the adjacent
 350         // two frames. We can just drop such a frame, but we
 351         // immediately show the next frame instead to keep the frame
 352         // drops evenly spaced during normal 3:2 pulldown sequences.
 353         if ((3*f[1].r.o < f[1].r.e) && (f[1].r.s < f[1].r.d)) {
 354                 p->dropnext = 1;
 355                 return F_NEXT;
 356         }
 357
 358         // If none of these conditions hold, we will consider the frame
 359         // progressive and just show it as-is.
 360         if (!(  (3*f[0].r.e < f[0].r.o) ||
 361                 ((2*f[0].r.d < f[0].r.s) && (f[0].r.s > 1200)) ||
 362                 ((2*f[1].r.t < f[1].r.p) && (f[1].r.p > 1200))  ))
 363                 return F_SHOW;
 364
 365         // Otherwise, we have to decide whether to merge or drop.
 366         // If the noise metric only increases minimally, we're off
 367         // to a good start...
 368         if (((2*f[1].r.t < 3*f[1].r.p) && (f[1].r.t < 3600)) ||
 369                 (f[1].r.t < 900) || (f[1].r.d < 900)) {
 370                 // ...and if noise decreases or the duplicate even field
 371                 // is detected, we go ahead with the merge.
 372                 if ((3*f[0].r.e < f[0].r.o) || (2*f[1].r.t < f[1].r.p)) {
 373                         p->dropnext = 1;
 374                         return F_MERGE;
 375                 }
 376         }
 377         return F_DROP;
 378 }
 379
 380
 381
 382 static void copy_image(mp_image_t *dmpi, mp_image_t *mpi, int field)
 383 {
 384         switch (field) {
 385         case 0:
 386                 my_memcpy_pic(dmpi->planes[0], mpi->planes[0], mpi->w, mpi->h/2,
 387                         dmpi->stride[0]*2, mpi->stride[0]*2);
 388                 if (mpi->flags & MP_IMGFLAG_PLANAR) {
 389                         my_memcpy_pic(dmpi->planes[1], mpi->planes[1],
 390                                 mpi->chroma_width, mpi->chroma_height/2,
 391                                 dmpi->stride[1]*2, mpi->stride[1]*2);
 392                         my_memcpy_pic(dmpi->planes[2], mpi->planes[2],
 393                                 mpi->chroma_width, mpi->chroma_height/2,
 394                                 dmpi->stride[2]*2, mpi->stride[2]*2);
 395                 }
 396                 break;
 397         case 1:
 398                 my_memcpy_pic(dmpi->planes[0]+dmpi->stride[0],
 399                         mpi->planes[0]+mpi->stride[0], mpi->w, mpi->h/2,
 400                         dmpi->stride[0]*2, mpi->stride[0]*2);
 401                 if (mpi->flags & MP_IMGFLAG_PLANAR) {
 402                         my_memcpy_pic(dmpi->planes[1]+dmpi->stride[1],
 403                                 mpi->planes[1]+mpi->stride[1],
 404                                 mpi->chroma_width, mpi->chroma_height/2,
 405                                 dmpi->stride[1]*2, mpi->stride[1]*2);
 406                         my_memcpy_pic(dmpi->planes[2]+dmpi->stride[2],
 407                                 mpi->planes[2]+mpi->stride[2],
 408                                 mpi->chroma_width, mpi->chroma_height/2,
 409                                 dmpi->stride[2]*2, mpi->stride[2]*2);
 410                 }
 411                 break;
 412         case 2:
 413                 memcpy_pic(dmpi->planes[0], mpi->planes[0], mpi->w, mpi->h,
 414                         dmpi->stride[0], mpi->stride[0]);
 415                 if (mpi->flags & MP_IMGFLAG_PLANAR) {
 416                         memcpy_pic(dmpi->planes[1], mpi->planes[1],
 417                                 mpi->chroma_width, mpi->chroma_height,
 418                                 dmpi->stride[1], mpi->stride[1]);
 419                         memcpy_pic(dmpi->planes[2], mpi->planes[2],
 420                                 mpi->chroma_width, mpi->chroma_height,
 421                                 dmpi->stride[2], mpi->stride[2]);
 422                 }
 423                 break;
 424         }
 425 }
 426
 427 static int do_put_image(struct vf_instance_s* vf, mp_image_t *dmpi)
 428 {
 429         struct vf_priv_s *p = vf->priv;
 430         int dropflag=0;
 431
 432         if (!p->dropnext) switch (p->drop) {
 433         case 0:
 434                 dropflag = 0;
 435                 break;
 436         case 1:
 437                 dropflag = (++p->lastdrop >= 5);
 438                 break;
 439         case 2:
 440                 dropflag = (++p->lastdrop >= 5) && (4*p->inframes <= 5*p->outframes);
 441                 break;
 442         }
 443
 444         if (dropflag) {
 445                 //mp_msg(MSGT_VFILTER, MSGL_V, "drop! [%d/%d=%g]\n",
 446                 //      p->outframes, p->inframes, (float)p->outframes/p->inframes);
 447                 mp_msg(MSGT_VFILTER, MSGL_V, "!");
 448                 p->lastdrop = 0;
 449                 return 0;
 450         }
 451
 452         p->outframes++;
 453         return vf_next_put_image(vf, dmpi, MP_NOPTS_VALUE);
 454 }
 455
 456 static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts)
 457 {
 458         int ret=0;
 459         struct vf_priv_s *p = vf->priv;
 460
 461         p->inframes++;
 462
 463         if (p->first) { /* hack */
 464                 p->first = 0;
 465                 return 1;
 466         }
 467
 468         if (!p->dmpi) p->dmpi = vf_get_image(vf->next, mpi->imgfmt,
 469                 MP_IMGTYPE_STATIC, MP_IMGFLAG_ACCEPT_STRIDE |
 470                 MP_IMGFLAG_PRESERVE | MP_IMGFLAG_READABLE,
 471                 mpi->width, mpi->height);
 472         /* FIXME -- not correct, off by one frame! */
 473         p->dmpi->qscale = mpi->qscale;
 474         p->dmpi->qstride = mpi->qstride;
 475         p->dmpi->qscale_type = mpi->qscale_type;
 476
 477         switch (foo(p, mpi, p->dmpi)) {
 478         case F_DROP:
 479                 copy_image(p->dmpi, mpi, 2);
 480                 ret = 0;
 481                 p->lastdrop = 0;
 482                 mp_msg(MSGT_VFILTER, MSGL_V, "DROP\n");
 483                 break;
 484         case F_MERGE:
 485                 copy_image(p->dmpi, mpi, 0);
 486                 ret = do_put_image(vf, p->dmpi);
 487                 copy_image(p->dmpi, mpi, 1);
 488                 mp_msg(MSGT_VFILTER, MSGL_V, "MERGE\n");
 489                 p->dmpi = NULL;
 490                 break;
 491         case F_NEXT:
 492                 copy_image(p->dmpi, mpi, 2);
 493                 ret = do_put_image(vf, p->dmpi);
 494                 mp_msg(MSGT_VFILTER, MSGL_V, "NEXT\n");
 495                 p->dmpi = NULL;
 496                 break;
 497         case F_SHOW:
 498                 ret = do_put_image(vf, p->dmpi);
 499                 copy_image(p->dmpi, mpi, 2);
 500                 mp_msg(MSGT_VFILTER, MSGL_V, "OK\n");
 501                 p->dmpi = NULL;
 502                 break;
 503         }
 504         return ret;
 505 }
 506
 507 static int query_format(struct vf_instance_s* vf, unsigned int fmt)
 508 {
 509         switch (fmt) {
 510         case IMGFMT_YV12:
 511         case IMGFMT_IYUV:
 512         case IMGFMT_I420:
 513                 return vf_next_query_format(vf, fmt);
 514         }
 515         return 0;
 516 }
 517
 518 static void uninit(struct vf_instance_s* vf)
 519 {
 520         free(vf->priv);
 521 }
 522
 523 static int open(vf_instance_t *vf, char* args)
 524 {
 525         struct vf_priv_s *p;
 526         vf->put_image = put_image;
 527         vf->query_format = query_format;
 528         vf->uninit = uninit;
 529         vf->default_reqs = VFCAP_ACCEPT_STRIDE;
 530         vf->priv = p = calloc(1, sizeof(struct vf_priv_s));
 531         p->drop = 0;
 532         p->first = 1;
 533         if (args) sscanf(args, "%d", &p->drop);
 534         block_diffs = block_diffs_C;
 535 #ifdef HAVE_MMX
 536         if(gCpuCaps.hasMMX) block_diffs = block_diffs_MMX;
 537 #endif
 538         return 1;
 539 }
 540
 541 vf_info_t vf_info_ivtc = {
 542     "inverse telecine, take 2",
 543     "ivtc",
 544     "Rich Felker",
 545     "",
 546     open,
 547     NULL
 548 };
 549
 550