/*
  * Copyright (c) 2012 Laurent de Soras
  * Copyright (c) 2013 Fredrik Mellbin
  * Copyright (c) 2015 Paul B Mahol

  * Copyright (c) 2015 James Darnley

  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/imgutils.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"

 #include "libavutil/qsort.h"

 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"

 #include "removegrain.h"

 #include "video.h"
 
 #define OFFSET(x) offsetof(RemoveGrainContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
 
 static const AVOption removegrain_options[] = {
     { "m0", "set mode for 1st plane", OFFSET(mode[0]), AV_OPT_TYPE_INT, {.i64=0}, 0, 24, FLAGS },
     { "m1", "set mode for 2nd plane", OFFSET(mode[1]), AV_OPT_TYPE_INT, {.i64=0}, 0, 24, FLAGS },
     { "m2", "set mode for 3rd plane", OFFSET(mode[2]), AV_OPT_TYPE_INT, {.i64=0}, 0, 24, FLAGS },
     { "m3", "set mode for 4th plane", OFFSET(mode[3]), AV_OPT_TYPE_INT, {.i64=0}, 0, 24, FLAGS },
     {NULL}
 };
 
 AVFILTER_DEFINE_CLASS(removegrain);
 
 static int query_formats(AVFilterContext *ctx)
 {
     static const enum AVPixelFormat pix_fmts[] = {
         AV_PIX_FMT_GRAY8,
         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
         AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
         AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
         AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
         AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
         AV_PIX_FMT_NONE
     };
 
     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
     if (!fmts_list)
         return AVERROR(ENOMEM);
     return ff_set_common_formats(ctx, fmts_list);
 }
 
 #define REMOVE_GRAIN_SORT_AXIS       \
     const int ma1 = FFMAX(a1, a8);   \
     const int mi1 = FFMIN(a1, a8);   \
     const int ma2 = FFMAX(a2, a7);   \
     const int mi2 = FFMIN(a2, a7);   \
     const int ma3 = FFMAX(a3, a6);   \
     const int mi3 = FFMIN(a3, a6);   \
     const int ma4 = FFMAX(a4, a5);   \
     const int mi4 = FFMIN(a4, a5);
 
 static int mode01(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int mi = FFMIN(FFMIN(FFMIN(a1, a2), FFMIN(a3, a4)), FFMIN(FFMIN(a5, a6), FFMIN(a7, a8)));
     const int ma = FFMAX(FFMAX(FFMAX(a1, a2), FFMAX(a3, a4)), FFMAX(FFMAX(a5, a6), FFMAX(a7, a8)));
 
     return av_clip(c, mi, ma);
 }
 
 static int cmp_int(const void *p1, const void *p2)
 {

     int left  = *(const int *)p1;

     int right = *(const int *)p2;

     return FFDIFFSIGN(left, right);

 }
 
 static int mode02(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     int a[8] = { a1, a2, a3, a4, a5, a6, a7, a8 };
 

     AV_QSORT(a, 8, int, cmp_int);

 
     return av_clip(c, a[2 - 1 ], a[7 - 1]);
 }
 
 static int mode03(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     int a[8] = { a1, a2, a3, a4, a5, a6, a7, a8 };
 

     AV_QSORT(a, 8, int, cmp_int);

 
     return av_clip(c, a[3 - 1 ], a[6 - 1]);
 }
 
 static int mode04(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     int a[8] = { a1, a2, a3, a4, a5, a6, a7, a8 };
 

     AV_QSORT(a, 8, int, cmp_int);

 
     return av_clip(c, a[4 - 1 ], a[5 - 1]);
 }
 
 static int mode05(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int c1 = FFABS(c - av_clip(c, mi1, ma1));
     const int c2 = FFABS(c - av_clip(c, mi2, ma2));
     const int c3 = FFABS(c - av_clip(c, mi3, ma3));
     const int c4 = FFABS(c - av_clip(c, mi4, ma4));
 
     const int mindiff = FFMIN(FFMIN(c1, c2), FFMIN(c3, c4));
 

     /* When adding SIMD notice the return order here: 4, 2, 3, 1. */

     if (mindiff == c4) {
         return av_clip(c, mi4, ma4);
     } else if (mindiff == c2) {
         return av_clip(c, mi2, ma2);
     } else if (mindiff == c3) {
         return av_clip(c, mi3, ma3);
     }
 
     return av_clip(c, mi1, ma1);
 }
 
 static int mode06(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int d1 = ma1 - mi1;
     const int d2 = ma2 - mi2;
     const int d3 = ma3 - mi3;
     const int d4 = ma4 - mi4;
 
     const int cli1 = av_clip(c, mi1, ma1);
     const int cli2 = av_clip(c, mi2, ma2);
     const int cli3 = av_clip(c, mi3, ma3);
     const int cli4 = av_clip(c, mi4, ma4);
 

     const int c1 = av_clip_uint16((FFABS(c - cli1) << 1) + d1);
     const int c2 = av_clip_uint16((FFABS(c - cli2) << 1) + d2);
     const int c3 = av_clip_uint16((FFABS(c - cli3) << 1) + d3);
     const int c4 = av_clip_uint16((FFABS(c - cli4) << 1) + d4);

 
     const int mindiff = FFMIN(FFMIN(c1, c2), FFMIN(c3, c4));
 
     if (mindiff == c4) {
         return cli4;
     } else if (mindiff == c2) {
         return cli2;
     } else if (mindiff == c3) {
         return cli3;
     }
 
     return cli1;
 }
 
 static int mode07(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int d1 = ma1 - mi1;
     const int d2 = ma2 - mi2;
     const int d3 = ma3 - mi3;
     const int d4 = ma4 - mi4;
 
     const int cli1 = av_clip(c, mi1, ma1);
     const int cli2 = av_clip(c, mi2, ma2);
     const int cli3 = av_clip(c, mi3, ma3);
     const int cli4 = av_clip(c, mi4, ma4);
 
     const int c1 = FFABS(c - cli1) + d1;
     const int c2 = FFABS(c - cli2) + d2;
     const int c3 = FFABS(c - cli3) + d3;
     const int c4 = FFABS(c - cli4) + d4;
 
     const int mindiff = FFMIN(FFMIN(c1, c2), FFMIN(c3, c4));
 
     if (mindiff == c4) {
         return cli4;
     } else if (mindiff == c2) {
         return cli2;
     } else if (mindiff == c3) {
         return cli3;
     }
 
     return cli1;
 }
 
 static int mode08(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int d1 = ma1 - mi1;
     const int d2 = ma2 - mi2;
     const int d3 = ma3 - mi3;
     const int d4 = ma4 - mi4;
 
     const int cli1 = av_clip(c, mi1, ma1);
     const int cli2 = av_clip(c, mi2, ma2);
     const int cli3 = av_clip(c, mi3, ma3);
     const int cli4 = av_clip(c, mi4, ma4);
 

     const int c1 = av_clip_uint16(FFABS(c - cli1) + (d1 << 1));
     const int c2 = av_clip_uint16(FFABS(c - cli2) + (d2 << 1));
     const int c3 = av_clip_uint16(FFABS(c - cli3) + (d3 << 1));
     const int c4 = av_clip_uint16(FFABS(c - cli4) + (d4 << 1));

 
     const int mindiff = FFMIN(FFMIN(c1, c2), FFMIN(c3, c4));
 
     if (mindiff == c4) {
         return cli4;
     } else if (mindiff == c2) {
         return cli2;
     } else if (mindiff == c3) {
         return cli3;
     }
 
     return cli1;
 }
 
 static int mode09(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int d1 = ma1 - mi1;
     const int d2 = ma2 - mi2;
     const int d3 = ma3 - mi3;
     const int d4 = ma4 - mi4;
 
     const int mindiff = FFMIN(FFMIN(d1, d2), FFMIN(d3, d4));
 
     if (mindiff == d4) {
         return av_clip(c, mi4, ma4);
     } else if (mindiff == d2) {
         return av_clip(c, mi2, ma2);
     } else if (mindiff == d3) {
         return av_clip(c, mi3, ma3);
     }
 
     return av_clip(c, mi1, ma1);
 }
 
 static int mode10(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int d1 = FFABS(c - a1);
     const int d2 = FFABS(c - a2);
     const int d3 = FFABS(c - a3);
     const int d4 = FFABS(c - a4);
     const int d5 = FFABS(c - a5);
     const int d6 = FFABS(c - a6);
     const int d7 = FFABS(c - a7);
     const int d8 = FFABS(c - a8);
 
     const int mindiff = FFMIN(FFMIN(FFMIN(d1, d2), FFMIN(d3, d4)),
                               FFMIN(FFMIN(d5, d6), FFMIN(d7, d8)));
 
     if (mindiff == d7) return a7;
     if (mindiff == d8) return a8;
     if (mindiff == d6) return a6;
     if (mindiff == d2) return a2;
     if (mindiff == d3) return a3;
     if (mindiff == d1) return a1;
     if (mindiff == d5) return a5;
 
     return a4;
 }
 
 static int mode1112(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int sum = 4 * c + 2 * (a2 + a4 + a5 + a7) + a1 + a3 + a6 + a8;
     const int val = (sum + 8) >> 4;
 
     return val;
 }
 
 static int mode1314(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int d1 = FFABS(a1 - a8);
     const int d2 = FFABS(a2 - a7);
     const int d3 = FFABS(a3 - a6);
 
     const int mindiff = FFMIN(FFMIN(d1, d2), d3);
 
     if (mindiff == d2) {
         return (a2 + a7 + 1) >> 1;
     }
     if (mindiff == d3) {
         return (a3 + a6 + 1) >> 1;
     }
 
     return (a1 + a8 + 1) >> 1;
 }
 
 static int mode1516(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int d1 = FFABS(a1 - a8);
     const int d2 = FFABS(a2 - a7);
     const int d3 = FFABS(a3 - a6);
 
     const int mindiff = FFMIN(FFMIN(d1, d2), d3);
     const int average = (2 * (a2 + a7) + a1 + a3 + a6 + a8 + 4) >> 3;
 
     if (mindiff == d2) {
         return av_clip(average, FFMIN(a2, a7), FFMAX(a2, a7));
     }
     if (mindiff == d3) {
         return av_clip(average, FFMIN(a3, a6), FFMAX(a3, a6));
     }
 
     return av_clip(average, FFMIN(a1, a8), FFMAX(a1, a8));
 }
 
 static int mode17(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int l = FFMAX(FFMAX(mi1, mi2), FFMAX(mi3, mi4));
     const int u = FFMIN(FFMIN(ma1, ma2), FFMIN(ma3, ma4));
 
     return av_clip(c, FFMIN(l, u), FFMAX(l, u));
 }
 
 static int mode18(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int d1 = FFMAX(FFABS(c - a1), FFABS(c - a8));
     const int d2 = FFMAX(FFABS(c - a2), FFABS(c - a7));
     const int d3 = FFMAX(FFABS(c - a3), FFABS(c - a6));
     const int d4 = FFMAX(FFABS(c - a4), FFABS(c - a5));
 
     const int mindiff = FFMIN(FFMIN(d1, d2), FFMIN(d3, d4));
 
     if (mindiff == d4) {
         return av_clip(c, FFMIN(a4, a5), FFMAX(a4, a5));
     }
     if (mindiff == d2) {
         return av_clip(c, FFMIN(a2, a7), FFMAX(a2, a7));
     }
     if (mindiff == d3) {
         return av_clip(c, FFMIN(a3, a6), FFMAX(a3, a6));
     }
 
     return av_clip(c, FFMIN(a1, a8), FFMAX(a1, a8));
 }
 
 static int mode19(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int sum = a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8;
     const int val = (sum + 4) >> 3;
 
     return val;
 }
 
 static int mode20(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int sum = a1 + a2 + a3 + a4 + c + a5 + a6 + a7 + a8;
     const int val = (sum + 4) / 9;
 
     return val;
 }
 
 static int mode21(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int l1l = (a1 + a8) >> 1;
     const int l2l = (a2 + a7) >> 1;
     const int l3l = (a3 + a6) >> 1;
     const int l4l = (a4 + a5) >> 1;
 
     const int l1h = (a1 + a8 + 1) >> 1;
     const int l2h = (a2 + a7 + 1) >> 1;
     const int l3h = (a3 + a6 + 1) >> 1;
     const int l4h = (a4 + a5 + 1) >> 1;
 
     const int mi = FFMIN(FFMIN(l1l, l2l), FFMIN(l3l, l4l));
     const int ma = FFMAX(FFMAX(l1h, l2h), FFMAX(l3h, l4h));
 
     return av_clip(c, mi, ma);
 }
 
 static int mode22(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     const int l1 = (a1 + a8 + 1) >> 1;
     const int l2 = (a2 + a7 + 1) >> 1;
     const int l3 = (a3 + a6 + 1) >> 1;
     const int l4 = (a4 + a5 + 1) >> 1;
 
     const int mi = FFMIN(FFMIN(l1, l2), FFMIN(l3, l4));
     const int ma = FFMAX(FFMAX(l1, l2), FFMAX(l3, l4));
 
     return av_clip(c, mi, ma);
 }
 
 static int mode23(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int linediff1 = ma1 - mi1;
     const int linediff2 = ma2 - mi2;
     const int linediff3 = ma3 - mi3;
     const int linediff4 = ma4 - mi4;
 
     const int u1 = FFMIN(c - ma1, linediff1);
     const int u2 = FFMIN(c - ma2, linediff2);
     const int u3 = FFMIN(c - ma3, linediff3);
     const int u4 = FFMIN(c - ma4, linediff4);
     const int u = FFMAX(FFMAX(FFMAX(u1, u2), FFMAX(u3, u4)), 0);
 
     const int d1 = FFMIN(mi1 - c, linediff1);
     const int d2 = FFMIN(mi2 - c, linediff2);
     const int d3 = FFMIN(mi3 - c, linediff3);
     const int d4 = FFMIN(mi4 - c, linediff4);
     const int d = FFMAX(FFMAX(FFMAX(d1, d2), FFMAX(d3, d4)), 0);
 
     return c - u + d;  // This probably will never overflow.
 }
 
 static int mode24(int c, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8)
 {
     REMOVE_GRAIN_SORT_AXIS
 
     const int linediff1 = ma1 - mi1;
     const int linediff2 = ma2 - mi2;
     const int linediff3 = ma3 - mi3;
     const int linediff4 = ma4 - mi4;
 
     const int tu1 = c - ma1;
     const int tu2 = c - ma2;
     const int tu3 = c - ma3;
     const int tu4 = c - ma4;
 
     const int u1 = FFMIN(tu1, linediff1 - tu1);
     const int u2 = FFMIN(tu2, linediff2 - tu2);
     const int u3 = FFMIN(tu3, linediff3 - tu3);
     const int u4 = FFMIN(tu4, linediff4 - tu4);
     const int u = FFMAX(FFMAX(FFMAX(u1, u2), FFMAX(u3, u4)), 0);
 
     const int td1 = mi1 - c;
     const int td2 = mi2 - c;
     const int td3 = mi3 - c;
     const int td4 = mi4 - c;
 
     const int d1 = FFMIN(td1, linediff1 - td1);
     const int d2 = FFMIN(td2, linediff2 - td2);
     const int d3 = FFMIN(td3, linediff3 - td3);
     const int d4 = FFMIN(td4, linediff4 - td4);
     const int d = FFMAX(FFMAX(FFMAX(d1, d2), FFMAX(d3, d4)), 0);
 
     return c - u + d;  // This probably will never overflow.
 }
 
 static int config_input(AVFilterLink *inlink)
 {
     RemoveGrainContext *s = inlink->dst->priv;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
     int i;
 
     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
 

     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);

     s->planeheight[0] = s->planeheight[3] = inlink->h;

     s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);

     s->planewidth[0]  = s->planewidth[3]  = inlink->w;
 
     for (i = 0; i < s->nb_planes; i++) {
         switch (s->mode[i]) {
         case 1:  s->rg[i] = mode01;   break;
         case 2:  s->rg[i] = mode02;   break;
         case 3:  s->rg[i] = mode03;   break;
         case 4:  s->rg[i] = mode04;   break;
         case 5:  s->rg[i] = mode05;   break;
         case 6:  s->rg[i] = mode06;   break;
         case 7:  s->rg[i] = mode07;   break;
         case 8:  s->rg[i] = mode08;   break;
         case 9:  s->rg[i] = mode09;   break;
         case 10: s->rg[i] = mode10;   break;
         case 11: s->rg[i] = mode1112; break;
         case 12: s->rg[i] = mode1112; break;
         case 13: s->skip_odd = 1;
                  s->rg[i] = mode1314; break;
         case 14: s->skip_even = 1;
                  s->rg[i] = mode1314; break;
         case 15: s->skip_odd = 1;
                  s->rg[i] = mode1516; break;
         case 16: s->skip_even = 1;
                  s->rg[i] = mode1516; break;
         case 17: s->rg[i] = mode17;   break;
         case 18: s->rg[i] = mode18;   break;
         case 19: s->rg[i] = mode19;   break;
         case 20: s->rg[i] = mode20;   break;
         case 21: s->rg[i] = mode21;   break;
         case 22: s->rg[i] = mode22;   break;
         case 23: s->rg[i] = mode23;   break;
         case 24: s->rg[i] = mode24;   break;
         }
     }
 

     if (ARCH_X86)
         ff_removegrain_init_x86(s);
 

     return 0;
 }
 
 typedef struct ThreadData {
     AVFrame *in, *out;
     int plane;
 } ThreadData;
 
 static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 {
     RemoveGrainContext *s = ctx->priv;
     ThreadData *td = arg;
     AVFrame *in = td->in;
     AVFrame *out = td->out;
     const int i = td->plane;
     const int height = s->planeheight[i];
     const int om = in->linesize[i] - 1;
     const int o0 = in->linesize[i]    ;
     const int op = in->linesize[i] + 1;
     int start = (height *  jobnr   ) / nb_jobs;
     int end   = (height * (jobnr+1)) / nb_jobs;
     int x, y;
 
     start = FFMAX(1, start);
     end   = FFMIN(height-1, end);
     for (y = start; y < end; y++) {
         uint8_t *dst = out->data[i];
         uint8_t *src = in->data[i];
 
         src = in->data[i] + y * in->linesize[i];
         dst = out->data[i] + y * out->linesize[i];
 
         if (s->skip_even && !(y & 1)) {
             memcpy(dst, src, s->planewidth[i]);
             continue;
         }
         if (s->skip_odd && y & 1) {
             memcpy(dst, src, s->planewidth[i]);
             continue;
         }
 
         *dst++ = *src++;

 
         if (s->fl[i]) {
             int w_asm = (s->planewidth[i] - 2) & ~15;
 
             s->fl[i](dst, src, in->linesize[i], w_asm);
 
             x = 1 + w_asm;
             dst += w_asm;
             src += w_asm;
         } else
             x = 1;
 
         for (; x < s->planewidth[i] - 1; x++) {

             const int a1 = src[-op];
             const int a2 = src[-o0];
             const int a3 = src[-om];
             const int a4 = src[-1 ];
             const int c  = src[ 0 ];
             const int a5 = src[ 1 ];
             const int a6 = src[ om];
             const int a7 = src[ o0];
             const int a8 = src[ op];
 
             const int res = s->rg[i](c, a1, a2, a3, a4, a5, a6, a7, a8);
 
             *dst = res;
             dst++, src++;
         }
         dst[0] = src[0];
     }
 
     return 0;
 }
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
     AVFilterContext *ctx = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
     RemoveGrainContext *s = ctx->priv;
     ThreadData td;
     AVFrame *out;
     int i;
 
     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!out) {
         av_frame_free(&in);
         return AVERROR(ENOMEM);
     }
     av_frame_copy_props(out, in);
 
     for (i = 0; i < s->nb_planes; i++) {
         uint8_t *dst = out->data[i];
         uint8_t *src = in->data[i];
 
         if (s->mode[i] == 0) {
             av_image_copy_plane(dst, out->linesize[i],
                                 src, in->linesize[i],
                                 s->planewidth[i], s->planeheight[i]);
             continue;
         }
 
         memcpy(dst, src, s->planewidth[i]);
 
         td.in = in; td.out = out; td.plane = i;
         ctx->internal->execute(ctx, filter_slice, &td, NULL,

                                FFMIN(s->planeheight[i], ff_filter_get_nb_threads(ctx)));

 
         src = in->data[i] + (s->planeheight[i] - 1) * in->linesize[i];
         dst = out->data[i] + (s->planeheight[i] - 1) * out->linesize[i];
         memcpy(dst, src, s->planewidth[i]);
     }
 
     av_frame_free(&in);
     return ff_filter_frame(outlink, out);
 }
 
 static const AVFilterPad removegrain_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_VIDEO,
         .filter_frame = filter_frame,
         .config_props = config_input,
     },
     { NULL }
 };
 
 static const AVFilterPad removegrain_outputs[] = {
     {
         .name = "default",
         .type = AVMEDIA_TYPE_VIDEO,
     },
     { NULL }
 };
 
 AVFilter ff_vf_removegrain = {
     .name          = "removegrain",
     .description   = NULL_IF_CONFIG_SMALL("Remove grain."),
     .priv_size     = sizeof(RemoveGrainContext),
     .query_formats = query_formats,
     .inputs        = removegrain_inputs,
     .outputs       = removegrain_outputs,
     .priv_class    = &removegrain_class,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
 };