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