[MPlayer-dev-eng] [PATCH] A filter to inverse-telecine deinterlaced video
Diego Biurrun
diego at biurrun.de
Sat Apr 17 03:50:25 CEST 2004
Rich (or maybe Michael), could you please check this patch? You are
our telecine expert...
Diego
Ville Saari writes:
> On Tue, Apr 13, 2004 at 05:42:45AM +0200, Diego Biurrun wrote:
>
> > nit1: prematUrely
> ...
> > nit2: End sentences with a period (also below).
> ...
> > nit3: I'd use capitalization for a full sentence after a colon.
> ...
> > nit4: There is a lot of trailing whitespace in your code.
>
> Another version of the patch attached. All the nits are addressed and
> I also fixed a bug that was inherited from vf_decimate, which I had used
> as a template when I originally started writing the filter: It didn't
> implement query_format(), so it was accepting many colorspaces that it
> couldn't actually handle.
>
> Now it probably rejects many colorspaces unnecessarily, but better
> safe that sorry. It would help if I could rtfm about all the colorspaces
> somewhere. Even better would be an API that could be used to query the
> properties of a given colorspace so that a filter could automatically
> be compatible with a new colorpace that didn't exist when the filter
> was written.
>
> This particular filter for example should be capable of handling any
> planar or packed colorspace that uses 8 bit samples and doesn't have
> any padding bytes with undefined values between pixels.
>
> --
> Ville
> 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 2004-04-13 22:04:18.000000000 +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 2004-04-12 16:50:05.000000000 +0300
> +++ patched/libmpcodecs/Makefile 2004-04-13 22:04:18.000000000 +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) $(VIDEO_SRCS_OPT)
>
> -VFILTER_SRCS=vf.c vf_vo.c vf_crop.c vf_expand.c vf_scale.c vf_format.c vf_noformat.c vf_yuy2.c vf_flip.c vf_rgb2bgr.c vf_rotate.c vf_mirror.c vf_palette.c vf_lavc.c vf_dvbscale.c vf_cropdetect.c vf_test.c vf_noise.c vf_yvu9.c vf_rectangle.c vf_lavcdeint.c vf_eq.c vf_eq2.c vf_halfpack.c vf_dint.c vf_1bpp.c vf_bmovl.c vf_2xsai.c vf_unsharp.c vf_swapuv.c vf_il.c vf_boxblur.c vf_sab.c vf_smartblur.c vf_perspective.c vf_down3dright.c vf_field.c vf_denoise3d.c vf_hqdn3d.c vf_detc.c vf_telecine.c vf_tfields.c vf_ivtc.c vf_ilpack.c vf_dsize.c vf_decimate.c vf_softpulldown.c vf_tinterlace.c vf_pullup.c pullup.c vf_framestep.c vf_tile.c vf_delogo.c vf_fil.c vf_hue.c vf_spp.c vf_yuvcsp.c vf_filmdint.c vf_kerndeint.c vf_rgbtest.c vf_qp.c vf_phase.c
> +VFILTER_SRCS=vf.c vf_vo.c vf_crop.c vf_expand.c vf_scale.c vf_format.c vf_noformat.c vf_yuy2.c vf_flip.c vf_rgb2bgr.c vf_rotate.c vf_mirror.c vf_palette.c vf_lavc.c vf_dvbscale.c vf_cropdetect.c vf_test.c vf_noise.c vf_yvu9.c vf_rectangle.c vf_lavcdeint.c vf_eq.c vf_eq2.c vf_halfpack.c vf_dint.c vf_1bpp.c vf_bmovl.c vf_2xsai.c vf_unsharp.c vf_swapuv.c vf_il.c vf_boxblur.c vf_sab.c vf_smartblur.c vf_perspective.c vf_down3dright.c vf_field.c vf_denoise3d.c vf_hqdn3d.c vf_detc.c vf_telecine.c vf_tfields.c vf_ivtc.c vf_ilpack.c vf_dsize.c vf_decimate.c vf_softpulldown.c vf_tinterlace.c vf_pullup.c pullup.c vf_framestep.c vf_tile.c vf_delogo.c vf_fil.c vf_hue.c vf_spp.c vf_yuvcs
> c vf_filmdint.c vf_kerndeint.c vf_rgbtest.c vf_qp.c vf_phase.c vf_divtc.c
> ifeq ($(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 2004-04-13 22:04:18.000000000 +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 2004-04-13 22:58:12.000000000 +0300
> @@ -0,0 +1,698 @@
> +#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 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 prematurely! "
> + "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 int query_format(struct vf_instance_s* vf, unsigned int fmt)
> + {
> + switch(fmt)
> + {
> + case IMGFMT_444P: case IMGFMT_IYUV: case IMGFMT_RGB24:
> + case IMGFMT_422P: case IMGFMT_UYVY: case IMGFMT_BGR24:
> + case IMGFMT_411P: case IMGFMT_YUY2: case IMGFMT_IF09:
> + case IMGFMT_YV12: case IMGFMT_I420: case IMGFMT_YVU9:
> + case IMGFMT_IUYV: case IMGFMT_Y800: case IMGFMT_Y8:
> + return vf_next_query_format(vf,fmt);
> + }
> +
> + return 0;
> + }
> +
> +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->query_format=query_format;
> + 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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