[MPlayer-dev-eng] [PATCH] A filter to inverse-telecine deinterlaced video

Ville Saari 114263 at foo.bar.org
Wed Apr 7 12:29:50 CEST 2004


On Tue, Apr 06, 2004 at 10:21:01PM +0200, Diego Biurrun wrote:

> Please escape the - in -ofps with a backslash.  This should be done with all
> option names.

Done. And I also escaped it in phrases like "0-255". New patch attached.

-- 
 Ville
-------------- next part --------------
diff -Naur main/DOCS/man/en/mplayer.1 patched/DOCS/man/en/mplayer.1
--- main/DOCS/man/en/mplayer.1	2004-03-30 18:23:31.000000000 +0300
+++ patched/DOCS/man/en/mplayer.1	2004-04-07 13:17:07.000000000 +0300
@@ -3136,6 +3136,61 @@
 Currently only libmpeg2 exports the needed flags.
 If used on material that does not set them, the filter does nothing.
 .TP
+.B divtc[=options]
+Inverse telecine for deinterlaced video.
+If 3:2-pulldown telecined video has lost one of the fields or is deinterlaced
+using a method that keeps one field and interpolates the other, the result is
+a juddering video that has every fourth frame duplicated.
+This filter is intended to find and drop those duplicates and restore the
+original film frame rate.
+When using this filter, you must specify \-ofps that is 4/5 of the fps of the
+input file (23.976 if the input is 29.97fps).
+The options are:
+.RSs
+.IPs pass=1|2
+Use two-pass mode.
+This produces best results.
+Pass 1 analyzes the video and writes the results to a log file.
+Pass 2 then reads this log file and uses the information to do the actual work.
+.IPs file=filename
+Set the 2-pass log file name (default: "framediff.log").
+.IPs threshold=value
+Set the minimum strength the telecine pattern must have for the filter to
+believe in it (default: 0.5).
+This is used to avoid recognizing false pattern from the parts of the video
+that are very dark or very still.
+.IPs window=numframes 
+Set the number of past frames to look at when searching for pattern
+(default: 30).
+Longer window improves the reliability of the pattern search, but shorter
+window improves the reaction time to the changes in the telecine phase.
+This only affects the one-pass mode.
+The two-pass mode currently uses fixed window that extends to both future
+and past.
+.IPs phase=0|1|2|3|4
+Sets the initial telecine phase for one-pass mode (default: 0).
+The two-pass mode can see the future, so it is able to use the correct
+phase from the beginning, but one-pass mode can only guess.
+It catches the correct phase when it finds it, but this option can be used
+to fix the possible juddering at the beginning.
+The first pass of the two-pass mode also uses this, so if you save the output
+from the first pass, you get constant phase result.
+.IPs deghost=value
+Set the deghosting threshold (0\-255 for one-pass mode, -255\-255 for two-pass
+mode, default 0).
+If nonzero, deghosting mode is used.
+This is for video that has been deinterlaced by blending the fields
+together instead of dropping one of the fields.
+Deghosting amplifies any compression artifacts in the blended frames, so the
+parameter value is used as a threshold to exclude those pixels from
+deghosting that differ from the previous frame less than specified value.
+If two-pass mode is used, then negative value can be used to make the
+filter analyze the whole video in the beginning of pass-2 to determine
+whether it needs deghosting or not and then select either zero or the
+absolute value of the parameter.
+Specify this option for pass-2, it makes no difference on pass-1.
+.RE
+.TP
 .B phase=[t|b|p|a|u|T|B|A|U][:v]
 Delay interlaced video by one field time so that the field order
 changes.
diff -Naur main/libmpcodecs/Makefile patched/libmpcodecs/Makefile
--- main/libmpcodecs/Makefile	2004-03-30 18:23:40.000000000 +0300
+++ patched/libmpcodecs/Makefile	2004-04-07 13:13:52.000000000 +0300
@@ -14,7 +14,7 @@
 VIDEO_SRCS_OPT=vd_realvid.c vd_ffmpeg.c vd_dshow.c vd_dmo.c vd_vfw.c vd_vfwex.c vd_odivx.c vd_divx4.c vd_zrmjpeg.c vd_xanim.c vd_xvid.c vd_xvid4.c vd_libdv.c vd_qtvideo.c vd_theora.c
 VIDEO_SRCS=dec_video.c vd.c $(VIDEO_SRCS_NAT) $(VIDEO_SRCS_LIB) $(VIDEO_SRCS_OPT)
 
-VFILTER_SRCS=vf.c vf_vo.c vf_crop.c vf_expand.c vf_scale.c vf_format.c vf_noformat.c vf_yuy2.c vf_flip.c vf_rgb2bgr.c vf_rotate.c vf_mirror.c vf_palette.c vf_lavc.c vf_dvbscale.c vf_cropdetect.c vf_test.c vf_noise.c vf_yvu9.c vf_rectangle.c vf_lavcdeint.c vf_eq.c vf_eq2.c vf_halfpack.c vf_dint.c vf_1bpp.c vf_bmovl.c vf_2xsai.c vf_unsharp.c vf_swapuv.c vf_il.c vf_boxblur.c vf_sab.c vf_smartblur.c vf_perspective.c vf_down3dright.c vf_field.c vf_denoise3d.c vf_hqdn3d.c vf_detc.c vf_telecine.c vf_tfields.c vf_ivtc.c vf_ilpack.c vf_dsize.c vf_decimate.c vf_softpulldown.c vf_tinterlace.c vf_pullup.c pullup.c vf_framestep.c vf_tile.c vf_delogo.c vf_fil.c vf_hue.c vf_spp.c vf_yuvcsp.c vf_filmdint.c vf_kerndeint.c vf_rgbtest.c vf_qp.c vf_phase.c
+VFILTER_SRCS=vf.c vf_vo.c vf_crop.c vf_expand.c vf_scale.c vf_format.c vf_noformat.c vf_yuy2.c vf_flip.c vf_rgb2bgr.c vf_rotate.c vf_mirror.c vf_palette.c vf_lavc.c vf_dvbscale.c vf_cropdetect.c vf_test.c vf_noise.c vf_yvu9.c vf_rectangle.c vf_lavcdeint.c vf_eq.c vf_eq2.c vf_halfpack.c vf_dint.c vf_1bpp.c vf_bmovl.c vf_2xsai.c vf_unsharp.c vf_swapuv.c vf_il.c vf_boxblur.c vf_sab.c vf_smartblur.c vf_perspective.c vf_down3dright.c vf_field.c vf_denoise3d.c vf_hqdn3d.c vf_detc.c vf_telecine.c vf_tfields.c vf_ivtc.c vf_ilpack.c vf_dsize.c vf_decimate.c vf_softpulldown.c vf_tinterlace.c vf_pullup.c pullup.c vf_framestep.c vf_tile.c vf_delogo.c vf_fil.c vf_hue.c vf_spp.c vf_yuvcsp.c vf_filmdint.c vf_kerndeint.c vf_rgbtest.c vf_qp.c vf_phase.c vf_divtc.c
 ifeq ($(HAVE_FFPOSTPROCESS),yes)
 VFILTER_SRCS += vf_pp.c
 endif
diff -Naur main/libmpcodecs/vf.c patched/libmpcodecs/vf.c
--- main/libmpcodecs/vf.c	2004-03-30 18:23:42.000000000 +0300
+++ patched/libmpcodecs/vf.c	2004-04-07 13:13:52.000000000 +0300
@@ -88,6 +88,7 @@
 extern vf_info_t vf_info_rgbtest;
 extern vf_info_t vf_info_qp;
 extern vf_info_t vf_info_phase;
+extern vf_info_t vf_info_divtc;
 
 // list of available filters:
 static vf_info_t* filter_list[]={
@@ -169,6 +170,7 @@
     &vf_info_qp,
 #endif
     &vf_info_phase,
+    &vf_info_divtc,
     NULL
 };
 
diff -Naur main/libmpcodecs/vf_divtc.c patched/libmpcodecs/vf_divtc.c
--- main/libmpcodecs/vf_divtc.c	1970-01-01 02:00:00.000000000 +0200
+++ patched/libmpcodecs/vf_divtc.c	2004-04-07 13:13:52.000000000 +0300
@@ -0,0 +1,689 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <math.h>
+
+#include "../config.h"
+#include "../mp_msg.h"
+#include "../cpudetect.h"
+#include "../bswap.h"
+
+#include "img_format.h"
+#include "mp_image.h"
+#include "vf.h"
+
+#include "../libvo/fastmemcpy.h"
+
+vf_info_t vf_info_divtc;
+
+struct vf_priv_s
+   {
+   int deghost, pass, phase, window, fcount, bcount, frameno, misscount,
+      ocount, sum[5];
+   double threshold;
+   FILE *file;
+   char *bdata;   
+   unsigned int *csdata;
+   int *history;
+   };
+
+/*
+ * diff_MMX and diff_C stolen from vf_decimate.c
+ */
+
+#ifdef HAVE_MMX
+static int diff_MMX(unsigned char *old, unsigned char *new, int os, int ns)
+   {
+   volatile short out[4];
+   asm (
+	"movl $8, %%ecx \n\t"
+	"pxor %%mm4, %%mm4 \n\t"
+	"pxor %%mm7, %%mm7 \n\t"
+	
+	".balign 16 \n\t"
+	"1: \n\t"
+	
+	"movq (%%esi), %%mm0 \n\t"
+	"movq (%%esi), %%mm2 \n\t"
+	"addl %%eax, %%esi \n\t"
+	"movq (%%edi), %%mm1 \n\t"
+	"addl %%ebx, %%edi \n\t"
+	"psubusb %%mm1, %%mm2 \n\t"
+	"psubusb %%mm0, %%mm1 \n\t"
+	"movq %%mm2, %%mm0 \n\t"
+	"movq %%mm1, %%mm3 \n\t"
+	"punpcklbw %%mm7, %%mm0 \n\t"
+	"punpcklbw %%mm7, %%mm1 \n\t"
+	"punpckhbw %%mm7, %%mm2 \n\t"
+	"punpckhbw %%mm7, %%mm3 \n\t"
+	"paddw %%mm0, %%mm4 \n\t"
+	"paddw %%mm1, %%mm4 \n\t"
+	"paddw %%mm2, %%mm4 \n\t"
+	"paddw %%mm3, %%mm4 \n\t"
+		
+	"decl %%ecx \n\t"
+	"jnz 1b \n\t"
+	"movq %%mm4, (%%edx) \n\t"
+	"emms \n\t"
+	: 
+	: "S" (old), "D" (new), "a" (os), "b" (ns), "d" (out)
+	: "memory"
+	);
+   return out[0]+out[1]+out[2]+out[3];
+   }
+#endif
+
+static int diff_C(unsigned char *old, unsigned char *new, int os, int ns)
+   {
+   int x, y, d=0;
+
+   for(y=8; y; y--, new+=ns, old+=os)
+      for(x=8; x; x--)
+	 d+=abs(new[x]-old[x]);
+
+   return d;
+   }
+
+static int (*diff)(unsigned char *, unsigned char *, int, int);
+
+static int diff_plane(unsigned char *old, unsigned char *new,
+		      int w, int h, int os, int ns, int arg)
+   {
+   int x, y, d, max=0, sum=0, n=0;
+ 
+   for(y=0; y<h-7; y+=8)
+      {
+      for(x=0; x<w-7; x+=8)
+	 {
+	 d=diff(old+x+y*os, new+x+y*ns, os, ns);
+	 if(d>max) max=d;
+	 sum+=d;
+	 n++;
+	 }
+      }
+
+   return (sum+n*max)/2;
+   }
+
+/*
+static unsigned int checksum_plane(unsigned char *p, unsigned char *z,
+				   int w, int h, int s, int zs, int arg)
+   {
+   unsigned int shift, sum;
+   unsigned char *e;
+
+   for(sum=0; h; h--, p+=s-w)
+      for(e=p+w, shift=32; p<e;)
+	 sum^=(*p++)<<(shift=(shift-8)&31);
+
+   return sum;
+   }
+*/
+
+static unsigned int checksum_plane(unsigned char *p, unsigned char *z,
+				   int w, int h, int s, int zs, int arg)
+   {
+   unsigned int shift;
+   uint32_t sum, t;
+   unsigned char *e, *e2;
+#if MP_WORDSIZE==64
+   typedef uint64_t wsum_t;
+#else
+   typedef uint32_t wsum_t;
+#endif
+   wsum_t wsum;
+
+   for(sum=0; h; h--, p+=s-w)
+      {
+      for(shift=0, e=p+w; (int)p&(sizeof(wsum_t)-1) && p<e;)
+	 sum^=*p++<<(shift=(shift-8)&31);
+
+      for(wsum=0, e2=e-sizeof(wsum_t)+1; p<e2; p+=sizeof(wsum_t))
+	 wsum^=*(wsum_t *)p;
+
+#if MP_WORDSIZE==64
+      t=be2me_32((uint32_t)(wsum>>32^wsum));
+#else
+      t=be2me_32(wsum);
+#endif
+
+      for(sum^=(t<<shift|t>>(32-shift)); p<e;)
+	 sum^=*p++<<(shift=(shift-8)&31);
+      }
+
+   return sum;
+   }
+
+static int deghost_plane(unsigned char *d, unsigned char *s,
+			 int w, int h, int ds, int ss, int threshold)
+   {
+   int t;
+   unsigned char *e;
+
+   for(; h; h--, s+=ss-w, d+=ds-w)
+      for(e=d+w; d<e; d++, s++)
+	 if(abs(*d-*s)>=threshold)
+	    *d=(t=(*d<<1)-*s)<0?0:t>255?255:t;
+
+   return 0;
+   }
+
+static int copy_plane(unsigned char *d, unsigned char *s,
+		      int w, int h, int ds, int ss, int arg)
+   {
+   memcpy_pic(d, s, w, h, ds, ss);
+   return 0;
+   }
+
+static int imgop(int(*planeop)(unsigned char *, unsigned char *,
+			       int, int, int, int, int),
+		 mp_image_t *dst, mp_image_t *src, int arg)
+   {
+   if(dst->flags&MP_IMGFLAG_PLANAR)
+      return planeop(dst->planes[0], src?src->planes[0]:0,
+		     dst->w, dst->h,
+		     dst->stride[0], src?src->stride[0]:0, arg)+
+	     planeop(dst->planes[1], src?src->planes[1]:0,
+		     dst->chroma_width, dst->chroma_height,
+		     dst->stride[1], src?src->stride[1]:0, arg)+
+	     planeop(dst->planes[2], src?src->planes[2]:0,
+		     dst->chroma_width, dst->chroma_height,
+		     dst->stride[2], src?src->stride[2]:0, arg);
+   
+   return planeop(dst->planes[0], src?src->planes[0]:0,
+		  dst->w*(dst->bpp/8), dst->h,
+		  dst->stride[0], src?src->stride[0]:0, arg);
+   }
+
+/*
+ * Find the phase in which the telecine pattern fits best to the
+ * given 5 frame slice of frame difference measurements.
+ *
+ * If phase1 and phase2 are not negative, only the two specified
+ * phases are tested.
+ */
+
+int cmp(int *a, int *b) { return *b-*a; }
+
+static int match(struct vf_priv_s *p, int *diffs,
+		 int phase1, int phase2, double *strength)
+   {
+   static const int pattern1[]={ -4,  1, 1, 1, 1 },
+      pattern2[]={ -2, -3, 4, 4, -3 }, *pattern;
+   int f, m, n, t[5];
+
+   pattern=p->deghost>0?pattern2:pattern1;
+
+   for(f=0; f<5; f++)
+      {
+      if(phase1<0 || phase2<0 || f==phase1 || f==phase2)
+	 {	 
+	 for(n=t[f]=0; n<5; n++)
+	    t[f]+=diffs[n]*pattern[(n-f+5)%5];
+	 }
+      else
+	 t[f]=INT_MIN;
+      }
+
+   /* find the best match */
+   for(m=0, n=1; n<5; n++)
+      if(t[n]>t[m]) m=n;
+
+   if(strength)
+      {
+      /* the second best match */
+      for(f=m?0:1, n=f+1; n<5; n++)
+	 if(n!=m && t[n]>t[f]) f=n;
+
+      *strength=(t[m]>0?(double)(t[m]-t[f])/t[m]:0.0);
+      }   
+
+   return m;
+   }
+
+static int put_image(struct vf_instance_s* vf, mp_image_t *mpi)
+   {
+   mp_image_t *dmpi, *tmpi=0;
+   int n, m, f, newphase;
+   struct vf_priv_s *p=vf->priv;
+   unsigned int checksum;
+   double d;
+
+   dmpi=vf_get_image(vf->next, mpi->imgfmt,
+		     MP_IMGTYPE_STATIC, MP_IMGFLAG_ACCEPT_STRIDE |
+		     MP_IMGFLAG_PRESERVE | MP_IMGFLAG_READABLE,
+		     mpi->width, mpi->height);
+   vf_clone_mpi_attributes(dmpi, mpi);
+
+   newphase=p->phase;
+
+   switch(p->pass)
+      {
+      case 1:
+	 fprintf(p->file, "%08x %d\n",
+		 (unsigned int)imgop((void *)checksum_plane, mpi, 0, 0),
+		 p->frameno?imgop(diff_plane, dmpi, mpi, 0):0);
+	 break;
+
+      case 2:
+	 if(p->frameno/5>p->bcount)
+	    {
+	    mp_msg(MSGT_VFILTER, MSGL_ERR,
+		   "\n%s: Log file ends prematrely! "
+		   "Switching to one pass mode\n", vf->info->name);
+	    p->pass=0;
+	    break;
+	    }
+
+	 checksum=(unsigned int)imgop((void *)checksum_plane, mpi, 0, 0);
+
+	 if(checksum!=p->csdata[p->frameno])
+	    {
+	    for(f=0; f<100; f++)
+	       if(p->frameno+f<p->fcount && p->csdata[p->frameno+f]==checksum)
+		  break;
+	       else if(p->frameno-f>=0 && p->csdata[p->frameno-f]==checksum)
+		  {
+		  f=-f;
+		  break;
+		  }
+
+	    if(f<100)
+	       {
+	       mp_msg(MSGT_VFILTER, MSGL_INFO,
+		      "\n%s: Mismatch with pass-1: %+d frame(s)\n",
+		      vf->info->name, f);
+
+	       p->frameno+=f;
+	       p->misscount=0;
+	       }
+	    else if(p->misscount++>=30)
+	       {
+	       mp_msg(MSGT_VFILTER, MSGL_ERR,
+		      "\n%s: Sync with pass-1 lost! "
+		      "Switching to one pass mode\n", vf->info->name);
+	       p->pass=0;
+	       break;
+	       }
+	    }
+	 
+	 n=(p->frameno)/5;
+	 if(n>=p->bcount) n=p->bcount-1;
+
+	 newphase=p->bdata[n];
+	 break;
+	 
+      default:
+	 if(p->frameno)
+	    {
+	    int *sump=p->sum+p->frameno%5,
+	       *histp=p->history+p->frameno%p->window;
+
+	    *sump-=*histp;
+	    *sump+=(*histp=imgop(diff_plane, dmpi, mpi, 0));
+	    }
+
+	 m=match(p, p->sum, -1, -1, &d);
+
+	 if(d>=p->threshold)
+	    newphase=m;
+      }
+
+   n=p->ocount++%5;
+
+   if(newphase!=p->phase && ((p->phase+4)%5<n)==((newphase+4)%5<n))
+      {
+      p->phase=newphase;
+      mp_msg(MSGT_VFILTER, MSGL_STATUS,
+	     "\n%s: Telecine phase %d\n", vf->info->name, p->phase);
+      }
+
+   switch((p->frameno++-p->phase+10)%5)
+      {
+      case 0:
+	 imgop((void *)memcpy_pic, dmpi, mpi, 0);
+	 return 0;
+
+      case 4:
+	 if(p->deghost>0)
+	    {
+	    tmpi=vf_get_image(vf->next, mpi->imgfmt,
+			      MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
+			      mpi->width, mpi->height);
+	    vf_clone_mpi_attributes(tmpi, mpi);
+
+	    imgop((void *)memcpy_pic, tmpi, mpi, 0);
+	    imgop(deghost_plane, tmpi, dmpi, p->deghost);
+	    imgop((void *)memcpy_pic, dmpi, mpi, 0);
+	    return vf_next_put_image(vf, tmpi);
+	    }
+      }
+
+   imgop((void *)memcpy_pic, dmpi, mpi, 0);
+   return vf_next_put_image(vf, dmpi);
+   }
+
+int analyze(struct vf_priv_s *p)
+   {
+   int *buf=0, *bp, bufsize=0, n, b, f, i, j, m, s;
+   unsigned int *cbuf=0, *cp;
+   char *pbuf;
+   char lbuf[256];
+   int sum[5];
+   double d;
+
+   /* read the file */
+
+   n=15;
+   while(fgets(lbuf, 256, p->file))
+      {
+      if(n>=bufsize-19)
+	 {
+	 bufsize=bufsize?bufsize*2:30000;
+	 if((bp=realloc(buf, bufsize*sizeof *buf))) buf=bp;
+	 if((cp=realloc(cbuf, bufsize*sizeof *cbuf))) cbuf=cp;
+
+	 if(!bp || !cp)
+	    {
+	    mp_msg(MSGT_VFILTER, MSGL_FATAL, "%s: not enough memory\n",
+		   vf_info_divtc.name);
+	    free(buf);
+	    free(cbuf);
+	    return 0;
+	    }
+	 }
+      sscanf(lbuf, "%x %d", cbuf+n, buf+n);
+      n++;
+      }
+
+   if(!n)
+      {
+      mp_msg(MSGT_VFILTER, MSGL_FATAL, "%s: empty 2-pass log file\n",
+	     vf_info_divtc.name);
+      free(buf);
+      free(cbuf);
+      return 0;
+      }
+
+   /* generate some dummy data past the beginning and end of the array */
+
+   buf+=15, cbuf+=15;
+   n-=15;
+   
+   memcpy(buf-15, buf, 15*sizeof *buf);
+   memset(cbuf-15, 0, 15*sizeof *cbuf);
+
+   while(n%5)
+      buf[n]=buf[n-5], cbuf[n]=0, n++;
+
+   memcpy(buf+n, buf+n-15, 15*sizeof *buf);
+   memset(cbuf+n, 0, 15*sizeof *cbuf);
+
+   p->csdata=cbuf;
+   p->fcount=n;
+
+   /* array with one slot for each slice of 5 frames */
+
+   p->bdata=pbuf=malloc(p->bcount=b=(n/5));
+   memset(pbuf, 255, b);
+
+   /* resolve the automatic mode */
+
+   if(p->deghost<0)
+      {
+      int deghost=-p->deghost;
+      double s0=0.0, s1=0.0;
+
+      for(f=0; f<n; f+=5)
+	 {
+	 p->deghost=0; match(p, buf+f, -1, -1, &d); s0+=d;
+	 p->deghost=1; match(p, buf+f, -1, -1, &d); s1+=d;
+	 }
+
+      p->deghost=s1>s0?deghost:0;	 
+
+      mp_msg(MSGT_VFILTER, MSGL_INFO,
+	     "%s: Deghosting %-3s (relative pattern strength %+.2fdB)\n",
+	     vf_info_divtc.name,
+	     p->deghost?"ON":"OFF",
+	     10.0*log10(s1/s0));
+      }
+
+   /* analyze the data */
+
+   for(f=0; f<5; f++)
+      for(sum[f]=0, n=-15; n<20; n+=5)
+	 sum[f]+=buf[n+f];
+
+   for(f=0; f<b; f++)
+      {
+      m=match(p, sum, -1, -1, &d);
+
+      if(d>=p->threshold)
+	 pbuf[f]=m;      
+
+      if(f<b-1)
+	 for(n=0; n<5; n++)
+	    sum[n]=sum[n]-buf[5*(f-3)+n]+buf[5*(f+4)+n];
+      }
+
+   /* fill in the gaps */
+
+   /* the beginning */
+   for(f=0; f<b && pbuf[f]==-1; f++);
+
+   if(f==b)
+      {
+      free(buf-15);
+      mp_msg(MSGT_VFILTER, MSGL_FATAL, "%s: no telecine pattern found!\n",
+	     vf_info_divtc.name);
+      return 0;
+      }
+
+   for(n=0; n<f; pbuf[n++]=pbuf[f]);
+
+   /* the end */
+   for(f=b-1; pbuf[f]==-1; f--);
+   for(n=f+1; n<b; pbuf[n++]=pbuf[f]);
+
+   /* the rest */
+   for(f=0;;)
+      {
+      while(f<b && pbuf[f]!=-1) f++;
+      if(f==b) break;
+      for(n=f; pbuf[n]==-1; n++);
+
+      if(pbuf[f-1]==pbuf[n])
+	 {
+	 /* just a gap */
+	 while(f<n) pbuf[f++]=pbuf[n];
+	 }
+      else
+	 {
+	 /* phase change, reanalyze the original data in the gap with zero
+	    threshold for only the two phases that appear at the ends */
+
+	 for(i=0; i<5; i++)
+	    for(sum[i]=0, j=5*f-15; j<5*f; j+=5)
+	       sum[i]+=buf[i+j];
+
+	 for(i=f; i<n; i++)
+	    {
+	    pbuf[i]=match(p, sum, pbuf[f-1], pbuf[n], 0);
+
+	    for(j=0; j<5; j++)
+	       sum[j]=sum[j]-buf[5*(i-3)+j]+buf[5*(i+4)+j];
+	    }
+
+	 /* estimate the transition point by dividing the gap
+	    in the same proportion as the number of matches of each kind */
+
+	 for(i=f, m=f; i<n; i++)
+	    if(pbuf[i]==pbuf[f-1]) m++;
+
+	 /* find the transition of the right direction nearest to the
+	    estimated point */
+
+	 if(m>f && m<n)
+	    {
+	    for(j=m; j>f; j--)
+	       if(pbuf[j-1]==pbuf[f-1] && pbuf[j]==pbuf[n]) break;
+	    for(s=m; s<n; s++)
+	       if(pbuf[s-1]==pbuf[f-1] && pbuf[s]==pbuf[n]) break;
+
+	    m=(s-m<m-j)?s:j;
+	    }
+
+	 /* and rewrite the data to allow only this one transition */
+
+	 for(i=f; i<m; i++)
+	    pbuf[i]=pbuf[f-1];
+
+	 for(; i<n; i++)
+	    pbuf[i]=pbuf[n];
+
+	 f=n;
+	 }
+      }
+
+   free(buf-15);
+
+   return 1;
+   }
+
+static void uninit(struct vf_instance_s* vf)
+   {
+   if(vf->priv)
+      {
+      if(vf->priv->file) fclose(vf->priv->file);
+      if(vf->priv->csdata) free(vf->priv->csdata-15);
+      free(vf->priv->bdata);
+      free(vf->priv->history);
+      free(vf->priv);
+      }
+   }
+
+static int open(vf_instance_t *vf, char* args)
+   {
+   struct vf_priv_s *p;
+   char *filename="framediff.log", *ap, *q, *a;
+
+   if(args && !(args=strdup(args)))
+      {
+   nomem:
+      mp_msg(MSGT_VFILTER, MSGL_FATAL,
+	     "%s: not enough memory\n", vf->info->name);
+   fail:
+      uninit(vf);
+      free(args);
+      return 0;
+      }
+
+   vf->put_image=put_image;
+   vf->uninit=uninit;
+   vf->default_reqs=VFCAP_ACCEPT_STRIDE;
+   if(!(vf->priv=p=calloc(1, sizeof(struct vf_priv_s))))
+      goto nomem;
+
+   p->phase=5;   
+   p->threshold=0.5;
+   p->window=30;
+
+   if((ap=args))
+      while(*ap)
+	 {
+	 q=ap;
+	 if((ap=strchr(q, ':'))) *ap++=0; else ap=q+strlen(q);
+	 if((a=strchr(q, '='))) *a++=0; else a=q+strlen(q);
+      
+	 switch(*q)
+	    {
+	    case 0:                              break;
+	    case 'f': filename=a;                break;
+	    case 't': p->threshold=atof(a);      break;
+	    case 'w': p->window=5*(atoi(a)+4)/5; break;
+	    case 'd': p->deghost=atoi(a);        break;
+	    case 'p':
+	       if(q[1]=='h') p->phase=atoi(a);
+	       else p->pass=atoi(a);
+	       break;
+
+	    case 'h':
+	       mp_msg(MSGT_VFILTER, MSGL_INFO,
+		      "\n%s options:\n\n"
+		      "pass=1|2         - Use 2-pass mode.\n"
+		      "file=filename    - Set the 2-pass log file name "
+		      "(default %s).\n"
+		      "threshold=value  - Set the pattern recognition "
+		      "sensitivity (default %g).\n"
+		      "deghost=value    - Select deghosting threshold "
+		      "(default %d).\n"
+		      "window=numframes - Set the statistics window "
+		      "for 1-pass mode (default %d).\n"
+		      "phase=0|1|2|3|4  - Set the initial phase "
+		      "for 1-pass mode (default %d).\n\n"
+		      "The option names can be abbreviated to the shortest "
+		      "unique prefix.\n\n",
+		      vf->info->name, filename, p->threshold, p->deghost,
+		      p->window, p->phase%5);
+	       break;
+	       
+	    default:
+	       mp_msg(MSGT_VFILTER, MSGL_FATAL,
+		      "%s: unknown argument %s\n", vf->info->name, q);	       
+	       goto fail;
+	    }
+	 }
+   
+   switch(p->pass)
+      {
+      case 1:
+	 if(!(p->file=fopen(filename, "w")))
+	    {
+	    mp_msg(MSGT_VFILTER, MSGL_FATAL,
+		   "%s: can't create file %s\n", vf->info->name, filename);
+	    goto fail;
+	    }
+
+	 break;
+	 
+      case 2:
+	 if(!(p->file=fopen(filename, "r")))
+	    {
+	    mp_msg(MSGT_VFILTER, MSGL_FATAL,
+		   "%s: can't open file %s\n", vf->info->name, filename);
+	    goto fail;
+	    }
+
+	 if(!analyze(p))
+	    goto fail;
+
+	 fclose(p->file);
+	 p->file=0;
+	 break;
+      }
+   
+   if(p->window<5) p->window=5;
+   if(!(p->history=calloc(sizeof *p->history, p->window)))
+      goto nomem;
+
+   diff=
+#ifdef HAVE_MMX
+      gCpuCaps.hasMMX?diff_MMX:
+#endif
+      diff_C;
+
+   free(args);
+   return 1;
+   }
+
+vf_info_t vf_info_divtc =
+   {
+   "inverse telecine for deinterlaced video",
+   "divtc",
+   "Ville Saari",
+   "",
+   open,
+   NULL
+   };


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