aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_removegrain.c
blob: bc45076baae939985490f1c88ea54736f3ede9e4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
/*
 * 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,
};