[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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