libmpcodecs/vf_divtc.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <limits.h>
   5 #include <math.h>
   6
   7 #include "config.h"
   8 #include "mp_msg.h"
   9 #include "cpudetect.h"
  10 #include "libavutil/common.h"
  11 #include "mpbswap.h"
  12
  13 #include "img_format.h"
  14 #include "mp_image.h"
  15 #include "vf.h"
  16
  17 #include "libvo/fastmemcpy.h"
  18
  19 const vf_info_t vf_info_divtc;
  20
  21 struct vf_priv_s
  22    {
  23    int deghost, pass, phase, window, fcount, bcount, frameno, misscount,
  24       ocount, sum[5];
  25    double threshold;
  26    FILE *file;
  27    char *bdata;
  28    unsigned int *csdata;
  29    int *history;
  30    };
  31
  32 /*
  33  * diff_MMX and diff_C stolen from vf_decimate.c
  34  */
  35
  36 #if HAVE_MMX && HAVE_EBX_AVAILABLE
  37 static int diff_MMX(unsigned char *old, unsigned char *new, int os, int ns)
  38    {
  39    volatile short out[4];
  40    __asm__ (
  41         "movl $8, %%ecx \n\t"
  42         "pxor %%mm4, %%mm4 \n\t"
  43         "pxor %%mm7, %%mm7 \n\t"
  44
  45         ASMALIGN(4)
  46         "1: \n\t"
  47
  48         "movq (%%"REG_S"), %%mm0 \n\t"
  49         "movq (%%"REG_S"), %%mm2 \n\t"
  50         "add %%"REG_a", %%"REG_S" \n\t"
  51         "movq (%%"REG_D"), %%mm1 \n\t"
  52         "add %%"REG_b", %%"REG_D" \n\t"
  53         "psubusb %%mm1, %%mm2 \n\t"
  54         "psubusb %%mm0, %%mm1 \n\t"
  55         "movq %%mm2, %%mm0 \n\t"
  56         "movq %%mm1, %%mm3 \n\t"
  57         "punpcklbw %%mm7, %%mm0 \n\t"
  58         "punpcklbw %%mm7, %%mm1 \n\t"
  59         "punpckhbw %%mm7, %%mm2 \n\t"
  60         "punpckhbw %%mm7, %%mm3 \n\t"
  61         "paddw %%mm0, %%mm4 \n\t"
  62         "paddw %%mm1, %%mm4 \n\t"
  63         "paddw %%mm2, %%mm4 \n\t"
  64         "paddw %%mm3, %%mm4 \n\t"
  65
  66         "decl %%ecx \n\t"
  67         "jnz 1b \n\t"
  68         "movq %%mm4, (%%"REG_d") \n\t"
  69         "emms \n\t"
  70         :
  71         : "S" (old), "D" (new), "a" ((long)os), "b" ((long)ns), "d" (out)
  72         : "%ecx", "memory"
  73         );
  74    return out[0]+out[1]+out[2]+out[3];
  75    }
  76 #endif
  77
  78 static int diff_C(unsigned char *old, unsigned char *new, int os, int ns)
  79    {
  80    int x, y, d=0;
  81
  82    for(y=8; y; y--, new+=ns, old+=os)
  83       for(x=8; x; x--)
  84          d+=abs(new[x]-old[x]);
  85
  86    return d;
  87    }
  88
  89 static int (*diff)(unsigned char *, unsigned char *, int, int);
  90
  91 static int diff_plane(unsigned char *old, unsigned char *new,
  92                       int w, int h, int os, int ns, int arg)
  93    {
  94    int x, y, d, max=0, sum=0, n=0;
  95
  96    for(y=0; y<h-7; y+=8)
  97       {
  98       for(x=0; x<w-7; x+=8)
  99          {
 100          d=diff(old+x+y*os, new+x+y*ns, os, ns);
 101          if(d>max) max=d;
 102          sum+=d;
 103          n++;
 104          }
 105       }
 106
 107    return (sum+n*max)/2;
 108    }
 109
 110 /*
 111 static unsigned int checksum_plane(unsigned char *p, unsigned char *z,
 112                                    int w, int h, int s, int zs, int arg)
 113    {
 114    unsigned int shift, sum;
 115    unsigned char *e;
 116
 117    for(sum=0; h; h--, p+=s-w)
 118       for(e=p+w, shift=32; p<e;)
 119          sum^=(*p++)<<(shift=(shift-8)&31);
 120
 121    return sum;
 122    }
 123 */
 124
 125 static unsigned int checksum_plane(unsigned char *p, unsigned char *z,
 126                                    int w, int h, int s, int zs, int arg)
 127    {
 128    unsigned int shift;
 129    uint32_t sum, t;
 130    unsigned char *e, *e2;
 131 #if HAVE_FAST_64BIT
 132    typedef uint64_t wsum_t;
 133 #else
 134    typedef uint32_t wsum_t;
 135 #endif
 136    wsum_t wsum;
 137
 138    for(sum=0; h; h--, p+=s-w)
 139       {
 140       for(shift=0, e=p+w; (int)p&(sizeof(wsum_t)-1) && p<e;)
 141          sum^=*p++<<(shift=(shift-8)&31);
 142
 143       for(wsum=0, e2=e-sizeof(wsum_t)+1; p<e2; p+=sizeof(wsum_t))
 144          wsum^=*(wsum_t *)p;
 145
 146 #if HAVE_FAST_64BIT
 147       t=be2me_32((uint32_t)(wsum>>32^wsum));
 148 #else
 149       t=be2me_32(wsum);
 150 #endif
 151
 152       for(sum^=(t<<shift|t>>(32-shift)); p<e;)
 153          sum^=*p++<<(shift=(shift-8)&31);
 154       }
 155
 156    return sum;
 157    }
 158
 159 static int deghost_plane(unsigned char *d, unsigned char *s,
 160                          int w, int h, int ds, int ss, int threshold)
 161    {
 162    int t;
 163    unsigned char *e;
 164
 165    for(; h; h--, s+=ss-w, d+=ds-w)
 166       for(e=d+w; d<e; d++, s++)
 167          if(abs(*d-*s)>=threshold)
 168             *d=(t=(*d<<1)-*s)<0?0:t>255?255:t;
 169
 170    return 0;
 171    }
 172
 173 static int copyop(unsigned char *d, unsigned char *s, int bpl, int h, int dstride, int sstride, int dummy) {
 174   memcpy_pic(d, s, bpl, h, dstride, sstride);
 175   return 0;
 176 }
 177
 178 static int imgop(int(*planeop)(unsigned char *, unsigned char *,
 179                                int, int, int, int, int),
 180                  mp_image_t *dst, mp_image_t *src, int arg)
 181    {
 182    if(dst->flags&MP_IMGFLAG_PLANAR)
 183       return planeop(dst->planes[0], src?src->planes[0]:0,
 184                      dst->w, dst->h,
 185                      dst->stride[0], src?src->stride[0]:0, arg)+
 186              planeop(dst->planes[1], src?src->planes[1]:0,
 187                      dst->chroma_width, dst->chroma_height,
 188                      dst->stride[1], src?src->stride[1]:0, arg)+
 189              planeop(dst->planes[2], src?src->planes[2]:0,
 190                      dst->chroma_width, dst->chroma_height,
 191                      dst->stride[2], src?src->stride[2]:0, arg);
 192
 193    return planeop(dst->planes[0], src?src->planes[0]:0,
 194                   dst->w*(dst->bpp/8), dst->h,
 195                   dst->stride[0], src?src->stride[0]:0, arg);
 196    }
 197
 198 /*
 199  * Find the phase in which the telecine pattern fits best to the
 200  * given 5 frame slice of frame difference measurements.
 201  *
 202  * If phase1 and phase2 are not negative, only the two specified
 203  * phases are tested.
 204  */
 205
 206 static int match(struct vf_priv_s *p, int *diffs,
 207                  int phase1, int phase2, double *strength)
 208    {
 209    const int pattern1[]={ -4,  1, 1, 1, 1 },
 210       pattern2[]={ -2, -3, 4, 4, -3 }, *pattern;
 211    int f, m, n, t[5];
 212
 213    pattern=p->deghost>0?pattern2:pattern1;
 214
 215    for(f=0; f<5; f++)
 216       {
 217       if(phase1<0 || phase2<0 || f==phase1 || f==phase2)
 218          {
 219          for(n=t[f]=0; n<5; n++)
 220             t[f]+=diffs[n]*pattern[(n-f+5)%5];
 221          }
 222       else
 223          t[f]=INT_MIN;
 224       }
 225
 226    /* find the best match */
 227    for(m=0, n=1; n<5; n++)
 228       if(t[n]>t[m]) m=n;
 229
 230    if(strength)
 231       {
 232       /* the second best match */
 233       for(f=m?0:1, n=f+1; n<5; n++)
 234          if(n!=m && t[n]>t[f]) f=n;
 235
 236       *strength=(t[m]>0?(double)(t[m]-t[f])/t[m]:0.0);
 237       }
 238
 239    return m;
 240    }
 241
 242 static int put_image(struct vf_instance* vf, mp_image_t *mpi, double pts)
 243    {
 244    mp_image_t *dmpi, *tmpi=0;
 245    int n, m, f, newphase;
 246    struct vf_priv_s *p=vf->priv;
 247    unsigned int checksum;
 248    double d;
 249
 250    dmpi=vf_get_image(vf->next, mpi->imgfmt,
 251                      MP_IMGTYPE_STATIC, MP_IMGFLAG_ACCEPT_STRIDE |
 252                      MP_IMGFLAG_PRESERVE | MP_IMGFLAG_READABLE,
 253                      mpi->width, mpi->height);
 254    vf_clone_mpi_attributes(dmpi, mpi);
 255
 256    newphase=p->phase;
 257
 258    switch(p->pass)
 259       {
 260       case 1:
 261          fprintf(p->file, "%08x %d\n",
 262                  (unsigned int)imgop((void *)checksum_plane, mpi, 0, 0),
 263                  p->frameno?imgop(diff_plane, dmpi, mpi, 0):0);
 264          break;
 265
 266       case 2:
 267          if(p->frameno/5>p->bcount)
 268             {
 269             mp_msg(MSGT_VFILTER, MSGL_ERR,
 270                    "\n%s: Log file ends prematurely! "
 271                    "Switching to one pass mode.\n", vf->info->name);
 272             p->pass=0;
 273             break;
 274             }
 275
 276          checksum=(unsigned int)imgop((void *)checksum_plane, mpi, 0, 0);
 277
 278          if(checksum!=p->csdata[p->frameno])
 279             {
 280             for(f=0; f<100; f++)
 281                if(p->frameno+f<p->fcount && p->csdata[p->frameno+f]==checksum)
 282                   break;
 283                else if(p->frameno-f>=0 && p->csdata[p->frameno-f]==checksum)
 284                   {
 285                   f=-f;
 286                   break;
 287                   }
 288
 289             if(f<100)
 290                {
 291                mp_msg(MSGT_VFILTER, MSGL_INFO,
 292                       "\n%s: Mismatch with pass-1: %+d frame(s).\n",
 293                       vf->info->name, f);
 294
 295                p->frameno+=f;
 296                p->misscount=0;
 297                }
 298             else if(p->misscount++>=30)
 299                {
 300                mp_msg(MSGT_VFILTER, MSGL_ERR,
 301                       "\n%s: Sync with pass-1 lost! "
 302                       "Switching to one pass mode.\n", vf->info->name);
 303                p->pass=0;
 304                break;
 305                }
 306             }
 307
 308          n=(p->frameno)/5;
 309          if(n>=p->bcount) n=p->bcount-1;
 310
 311          newphase=p->bdata[n];
 312          break;
 313
 314       default:
 315          if(p->frameno)
 316             {
 317             int *sump=p->sum+p->frameno%5,
 318                *histp=p->history+p->frameno%p->window;
 319
 320             *sump-=*histp;
 321             *sump+=(*histp=imgop(diff_plane, dmpi, mpi, 0));
 322             }
 323
 324          m=match(p, p->sum, -1, -1, &d);
 325
 326          if(d>=p->threshold)
 327             newphase=m;
 328       }
 329
 330    n=p->ocount++%5;
 331
 332    if(newphase!=p->phase && ((p->phase+4)%5<n)==((newphase+4)%5<n))
 333       {
 334       p->phase=newphase;
 335       mp_msg(MSGT_VFILTER, MSGL_STATUS,
 336              "\n%s: Telecine phase %d.\n", vf->info->name, p->phase);
 337       }
 338
 339    switch((p->frameno++-p->phase+10)%5)
 340       {
 341       case 0:
 342          imgop(copyop, dmpi, mpi, 0);
 343          return 0;
 344
 345       case 4:
 346          if(p->deghost>0)
 347             {
 348             tmpi=vf_get_image(vf->next, mpi->imgfmt,
 349                               MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE |
 350                               MP_IMGFLAG_READABLE,
 351                               mpi->width, mpi->height);
 352             vf_clone_mpi_attributes(tmpi, mpi);
 353
 354             imgop(copyop, tmpi, mpi, 0);
 355             imgop(deghost_plane, tmpi, dmpi, p->deghost);
 356             imgop(copyop, dmpi, mpi, 0);
 357             return vf_next_put_image(vf, tmpi, MP_NOPTS_VALUE);
 358             }
 359       }
 360
 361    imgop(copyop, dmpi, mpi, 0);
 362    return vf_next_put_image(vf, dmpi, MP_NOPTS_VALUE);
 363    }
 364
 365 static int analyze(struct vf_priv_s *p)
 366    {
 367    int *buf=0, *bp, bufsize=0, n, b, f, i, j, m, s;
 368    unsigned int *cbuf=0, *cp;
 369    char *pbuf;
 370    char lbuf[256];
 371    int sum[5];
 372    double d;
 373
 374    /* read the file */
 375
 376    n=15;
 377    while(fgets(lbuf, 256, p->file))
 378       {
 379       if(n>=bufsize-19)
 380          {
 381          bufsize=bufsize?bufsize*2:30000;
 382          if((bp=realloc(buf, bufsize*sizeof *buf))) buf=bp;
 383          if((cp=realloc(cbuf, bufsize*sizeof *cbuf))) cbuf=cp;
 384
 385          if(!bp || !cp)
 386             {
 387             mp_msg(MSGT_VFILTER, MSGL_FATAL, "%s: Not enough memory.\n",
 388                    vf_info_divtc.name);
 389             free(buf);
 390             free(cbuf);
 391             return 0;
 392             }
 393          }
 394       sscanf(lbuf, "%x %d", cbuf+n, buf+n);
 395       n++;
 396       }
 397
 398    if(!n)
 399       {
 400       mp_msg(MSGT_VFILTER, MSGL_FATAL, "%s: Empty 2-pass log file.\n",
 401              vf_info_divtc.name);
 402       free(buf);
 403       free(cbuf);
 404       return 0;
 405       }
 406
 407    /* generate some dummy data past the beginning and end of the array */
 408
 409    buf+=15, cbuf+=15;
 410    n-=15;
 411
 412    memcpy(buf-15, buf, 15*sizeof *buf);
 413    memset(cbuf-15, 0, 15*sizeof *cbuf);
 414
 415    while(n%5)
 416       buf[n]=buf[n-5], cbuf[n]=0, n++;
 417
 418    memcpy(buf+n, buf+n-15, 15*sizeof *buf);
 419    memset(cbuf+n, 0, 15*sizeof *cbuf);
 420
 421    p->csdata=cbuf;
 422    p->fcount=n;
 423
 424    /* array with one slot for each slice of 5 frames */
 425
 426    p->bdata=pbuf=malloc(p->bcount=b=(n/5));
 427    memset(pbuf, 255, b);
 428
 429    /* resolve the automatic mode */
 430
 431    if(p->deghost<0)
 432       {
 433       int deghost=-p->deghost;
 434       double s0=0.0, s1=0.0;
 435
 436       for(f=0; f<n; f+=5)
 437          {
 438          p->deghost=0; match(p, buf+f, -1, -1, &d); s0+=d;
 439          p->deghost=1; match(p, buf+f, -1, -1, &d); s1+=d;
 440          }
 441
 442       p->deghost=s1>s0?deghost:0;
 443
 444       mp_msg(MSGT_VFILTER, MSGL_INFO,
 445              "%s: Deghosting %-3s (relative pattern strength %+.2fdB).\n",
 446              vf_info_divtc.name,
 447              p->deghost?"ON":"OFF",
 448              10.0*log10(s1/s0));
 449       }
 450
 451    /* analyze the data */
 452
 453    for(f=0; f<5; f++)
 454       for(sum[f]=0, n=-15; n<20; n+=5)
 455          sum[f]+=buf[n+f];
 456
 457    for(f=0; f<b; f++)
 458       {
 459       m=match(p, sum, -1, -1, &d);
 460
 461       if(d>=p->threshold)
 462          pbuf[f]=m;
 463
 464       if(f<b-1)
 465          for(n=0; n<5; n++)
 466             sum[n]=sum[n]-buf[5*(f-3)+n]+buf[5*(f+4)+n];
 467       }
 468
 469    /* fill in the gaps */
 470
 471    /* the beginning */
 472    for(f=0; f<b && pbuf[f]==-1; f++);
 473
 474    if(f==b)
 475       {
 476       free(buf-15);
 477       mp_msg(MSGT_VFILTER, MSGL_FATAL, "%s: No telecine pattern found!\n",
 478              vf_info_divtc.name);
 479       return 0;
 480       }
 481
 482    for(n=0; n<f; pbuf[n++]=pbuf[f]);
 483
 484    /* the end */
 485    for(f=b-1; pbuf[f]==-1; f--);
 486    for(n=f+1; n<b; pbuf[n++]=pbuf[f]);
 487
 488    /* the rest */
 489    for(f=0;;)
 490       {
 491       while(f<b && pbuf[f]!=-1) f++;
 492       if(f==b) break;
 493       for(n=f; pbuf[n]==-1; n++);
 494
 495       if(pbuf[f-1]==pbuf[n])
 496          {
 497          /* just a gap */
 498          while(f<n) pbuf[f++]=pbuf[n];
 499          }
 500       else
 501          {
 502          /* phase change, reanalyze the original data in the gap with zero
 503             threshold for only the two phases that appear at the ends */
 504
 505          for(i=0; i<5; i++)
 506             for(sum[i]=0, j=5*f-15; j<5*f; j+=5)
 507                sum[i]+=buf[i+j];
 508
 509          for(i=f; i<n; i++)
 510             {
 511             pbuf[i]=match(p, sum, pbuf[f-1], pbuf[n], 0);
 512
 513             for(j=0; j<5; j++)
 514                sum[j]=sum[j]-buf[5*(i-3)+j]+buf[5*(i+4)+j];
 515             }
 516
 517          /* estimate the transition point by dividing the gap
 518             in the same proportion as the number of matches of each kind */
 519
 520          for(i=f, m=f; i<n; i++)
 521             if(pbuf[i]==pbuf[f-1]) m++;
 522
 523          /* find the transition of the right direction nearest to the
 524             estimated point */
 525
 526          if(m>f && m<n)
 527             {
 528             for(j=m; j>f; j--)
 529                if(pbuf[j-1]==pbuf[f-1] && pbuf[j]==pbuf[n]) break;
 530             for(s=m; s<n; s++)
 531                if(pbuf[s-1]==pbuf[f-1] && pbuf[s]==pbuf[n]) break;
 532
 533             m=(s-m<m-j)?s:j;
 534             }
 535
 536          /* and rewrite the data to allow only this one transition */
 537
 538          for(i=f; i<m; i++)
 539             pbuf[i]=pbuf[f-1];
 540
 541          for(; i<n; i++)
 542             pbuf[i]=pbuf[n];
 543
 544          f=n;
 545          }
 546       }
 547
 548    free(buf-15);
 549
 550    return 1;
 551    }
 552
 553 static int query_format(struct vf_instance* vf, unsigned int fmt)
 554    {
 555    switch(fmt)
 556       {
 557       case IMGFMT_444P: case IMGFMT_IYUV: case IMGFMT_RGB24:
 558       case IMGFMT_422P: case IMGFMT_UYVY: case IMGFMT_BGR24:
 559       case IMGFMT_411P: case IMGFMT_YUY2: case IMGFMT_IF09:
 560       case IMGFMT_YV12: case IMGFMT_I420: case IMGFMT_YVU9:
 561       case IMGFMT_IUYV: case IMGFMT_Y800: case IMGFMT_Y8:
 562          return vf_next_query_format(vf,fmt);
 563       }
 564
 565    return 0;
 566    }
 567
 568 static void uninit(struct vf_instance* vf)
 569    {
 570    if(vf->priv)
 571       {
 572       if(vf->priv->file) fclose(vf->priv->file);
 573       if(vf->priv->csdata) free(vf->priv->csdata-15);
 574       free(vf->priv->bdata);
 575       free(vf->priv->history);
 576       free(vf->priv);
 577       }
 578    }
 579
 580 static int open(vf_instance_t *vf, char* args)
 581    {
 582    struct vf_priv_s *p;
 583    char *filename="framediff.log", *ap, *q, *a;
 584
 585    if(args && !(args=strdup(args)))
 586       {
 587    nomem:
 588       mp_msg(MSGT_VFILTER, MSGL_FATAL,
 589              "%s: Not enough memory.\n", vf->info->name);
 590    fail:
 591       uninit(vf);
 592       free(args);
 593       return 0;
 594       }
 595
 596    vf->put_image=put_image;
 597    vf->uninit=uninit;
 598    vf->query_format=query_format;
 599    vf->default_reqs=VFCAP_ACCEPT_STRIDE;
 600    if(!(vf->priv=p=calloc(1, sizeof(struct vf_priv_s))))
 601       goto nomem;
 602
 603    p->phase=5;
 604    p->threshold=0.5;
 605    p->window=30;
 606
 607    if((ap=args))
 608       while(*ap)
 609          {
 610          q=ap;
 611          if((ap=strchr(q, ':'))) *ap++=0; else ap=q+strlen(q);
 612          if((a=strchr(q, '='))) *a++=0; else a=q+strlen(q);
 613
 614          switch(*q)
 615             {
 616             case 0:                              break;
 617             case 'f': filename=a;                break;
 618             case 't': p->threshold=atof(a);      break;
 619             case 'w': p->window=5*(atoi(a)+4)/5; break;
 620             case 'd': p->deghost=atoi(a);        break;
 621             case 'p':
 622                if(q[1]=='h') p->phase=atoi(a);
 623                else p->pass=atoi(a);
 624                break;
 625
 626             case 'h':
 627                mp_msg(MSGT_VFILTER, MSGL_INFO,
 628                       "\n%s options:\n\n"
 629                       "pass=1|2         - Use 2-pass mode.\n"
 630                       "file=filename    - Set the 2-pass log file name "
 631                       "(default %s).\n"
 632                       "threshold=value  - Set the pattern recognition "
 633                       "sensitivity (default %g).\n"
 634                       "deghost=value    - Select deghosting threshold "
 635                       "(default %d).\n"
 636                       "window=numframes - Set the statistics window "
 637                       "for 1-pass mode (default %d).\n"
 638                       "phase=0|1|2|3|4  - Set the initial phase "
 639                       "for 1-pass mode (default %d).\n\n"
 640                       "The option names can be abbreviated to the shortest "
 641                       "unique prefix.\n\n",
 642                       vf->info->name, filename, p->threshold, p->deghost,
 643                       p->window, p->phase%5);
 644                break;
 645
 646             default:
 647                mp_msg(MSGT_VFILTER, MSGL_FATAL,
 648                       "%s: Unknown argument %s.\n", vf->info->name, q);
 649                goto fail;
 650             }
 651          }
 652
 653    switch(p->pass)
 654       {
 655       case 1:
 656          if(!(p->file=fopen(filename, "w")))
 657             {
 658             mp_msg(MSGT_VFILTER, MSGL_FATAL,
 659                    "%s: Can't create file %s.\n", vf->info->name, filename);
 660             goto fail;
 661             }
 662
 663          break;
 664
 665       case 2:
 666          if(!(p->file=fopen(filename, "r")))
 667             {
 668             mp_msg(MSGT_VFILTER, MSGL_FATAL,
 669                    "%s: Can't open file %s.\n", vf->info->name, filename);
 670             goto fail;
 671             }
 672
 673          if(!analyze(p))
 674             goto fail;
 675
 676          fclose(p->file);
 677          p->file=0;
 678          break;
 679       }
 680
 681    if(p->window<5) p->window=5;
 682    if(!(p->history=calloc(sizeof *p->history, p->window)))
 683       goto nomem;
 684
 685    diff = diff_C;
 686 #if HAVE_MMX && HAVE_EBX_AVAILABLE
 687    if(gCpuCaps.hasMMX) diff = diff_MMX;
 688 #endif
 689
 690    free(args);
 691    return 1;
 692    }
 693
 694 const vf_info_t vf_info_divtc =
 695    {
 696    "inverse telecine for deinterlaced video",
 697    "divtc",
 698    "Ville Saari",
 699    "",
 700    open,
 701    NULL
 702    };