1 /*
2 * Copyright (c) 2021 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/common.h"
22 #include "libavutil/imgutils.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
25 #include "avfilter.h"
26 #include "formats.h"
27 #include "internal.h"
28 #include "video.h"
29
30 typedef struct ESTDIFContext {
31 const AVClass *class;
32
33 int mode; ///< 0 is frame, 1 is field
34 int parity; ///< frame field parity
35 int deint; ///< which frames to deinterlace
36 int rslope; ///< best edge slope search radius
37 int redge; ///< best edge match search radius
38 int interp; ///< type of interpolation
39 int linesize[4]; ///< bytes of pixel data per line for each plane
40 int planewidth[4]; ///< width of each plane
41 int planeheight[4]; ///< height of each plane
42 int field; ///< which field are we on, 0 or 1
43 int eof;
44 int depth;
45 int half;
46 int nb_planes;
47 int nb_threads;
48 int64_t pts;
49 AVFrame *prev;
50
51 void (*interpolate)(struct ESTDIFContext *s, uint8_t *dst,
52 const uint8_t *prev_line, const uint8_t *next_line,
53 const uint8_t *prev2_line, const uint8_t *next2_line,
54 const uint8_t *prev3_line, const uint8_t *next3_line,
55 int x, int width, int rslope, int redge, unsigned half,
56 int depth, int *K);
57
58 unsigned (*mid_8[3])(const uint8_t *const prev,
59 const uint8_t *const next,
60 const uint8_t *const prev2,
61 const uint8_t *const next2,
62 const uint8_t *const prev3,
63 const uint8_t *const next3,
64 int end, int x, int k, int depth);
65
66 unsigned (*mid_16[3])(const uint16_t *const prev,
67 const uint16_t *const next,
68 const uint16_t *const prev2,
69 const uint16_t *const next2,
70 const uint16_t *const prev3,
71 const uint16_t *const next3,
72 int end, int x, int k, int depth);
73 } ESTDIFContext;
74
75 #define MAX_R 15
76 #define S (MAX_R * 2 + 1)
77
78 #define OFFSET(x) offsetof(ESTDIFContext, x)
79 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
80 #define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit }
81
82 static const AVOption estdif_options[] = {
83 { "mode", "specify the mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "mode" },
84 CONST("frame", "send one frame for each frame", 0, "mode"),
85 CONST("field", "send one frame for each field", 1, "mode"),
86 { "parity", "specify the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, FLAGS, "parity" },
87 CONST("tff", "assume top field first", 0, "parity"),
88 CONST("bff", "assume bottom field first", 1, "parity"),
89 CONST("auto", "auto detect parity", -1, "parity"),
90 { "deint", "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "deint" },
91 CONST("all", "deinterlace all frames", 0, "deint"),
92 CONST("interlaced", "only deinterlace frames marked as interlaced", 1, "deint"),
93 { "rslope", "specify the search radius for edge slope tracing", OFFSET(rslope), AV_OPT_TYPE_INT, {.i64=1}, 1, MAX_R, FLAGS, },
94 { "redge", "specify the search radius for best edge matching", OFFSET(redge), AV_OPT_TYPE_INT, {.i64=2}, 0, MAX_R, FLAGS, },
95 { "interp", "specify the type of interpolation", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=1}, 0, 2, FLAGS, "interp" },
96 CONST("2p", "two-point interpolation", 0, "interp"),
97 CONST("4p", "four-point interpolation", 1, "interp"),
98 CONST("6p", "six-point interpolation", 2, "interp"),
99 { NULL }
100 };
101
102 AVFILTER_DEFINE_CLASS(estdif);
103
query_formats(AVFilterContext * ctx)104 static int query_formats(AVFilterContext *ctx)
105 {
106 static const enum AVPixelFormat pix_fmts[] = {
107 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
108 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
109 AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
110 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
111 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
112 AV_PIX_FMT_YUVJ411P,
113 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
114 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
115 AV_PIX_FMT_GRAY8,
116 AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
117 AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
118 AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
119 AV_PIX_FMT_YUV440P10,
120 AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
121 AV_PIX_FMT_YUV440P12,
122 AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
123 AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
124 AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
125 AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
126 AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
127 AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
128 AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
129 AV_PIX_FMT_NONE
130 };
131
132 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
133 if (!fmts_list)
134 return AVERROR(ENOMEM);
135 return ff_set_common_formats(ctx, fmts_list);
136 }
137
config_output(AVFilterLink * outlink)138 static int config_output(AVFilterLink *outlink)
139 {
140 AVFilterContext *ctx = outlink->src;
141 AVFilterLink *inlink = ctx->inputs[0];
142
143 outlink->time_base.num = inlink->time_base.num;
144 outlink->time_base.den = inlink->time_base.den * 2;
145 outlink->frame_rate.num = inlink->frame_rate.num * 2;
146 outlink->frame_rate.den = inlink->frame_rate.den;
147
148 return 0;
149 }
150
151 typedef struct ThreadData {
152 AVFrame *out, *in;
153 } ThreadData;
154
155 #define MIDL(type, ss) \
156 static unsigned midl_##ss(const type *const prev, \
157 const type *const next, \
158 int end, int x, int k) \
159 { \
160 return (prev[av_clip(x + k, 0, end)] + \
161 next[av_clip(x - k, 0, end)] + 1) >> 1; \
162 }
163
164 MIDL(uint8_t, 8)
165 MIDL(uint16_t, 16)
166
167 #define MID2(type, ss) \
168 static unsigned mid2_##ss(const type *const prev, \
169 const type *const next, \
170 const type *const prev2, \
171 const type *const next2, \
172 const type *const prev3, \
173 const type *const next3, \
174 int end, int x, int k, int depth) \
175 { \
176 return (prev[av_clip(x + k, 0, end)] + \
177 next[av_clip(x - k, 0, end)] + 1) >> 1; \
178 }
179
180 MID2(uint8_t, 8)
181 MID2(uint16_t, 16)
182
183 #define MID4(type, ss) \
184 static unsigned mid4_##ss(const type *const prev, \
185 const type *const next, \
186 const type *const prev2, \
187 const type *const next2, \
188 const type *const prev3, \
189 const type *const next3, \
190 int end, int x, int k, int depth) \
191 { \
192 return av_clip_uintp2_c(( \
193 9 * (prev[av_clip(x + k, 0, end)] + \
194 next[av_clip(x - k, 0, end)]) - \
195 1 * (prev2[av_clip(x + k*3, 0, end)] + \
196 next2[av_clip(x - k*3, 0, end)]) + 8) >> 4, \
197 depth); \
198 }
199
200 MID4(uint8_t, 8)
201 MID4(uint16_t, 16)
202
203 #define MID6(type, ss) \
204 static unsigned mid6_##ss(const type *const prev, \
205 const type *const next, \
206 const type *const prev2, \
207 const type *const next2, \
208 const type *const prev3, \
209 const type *const next3, \
210 int end, int x, int k, int depth) \
211 { \
212 return av_clip_uintp2_c(( \
213 20 * (prev[av_clip(x + k, 0, end)] + \
214 next[av_clip(x - k, 0, end)]) - \
215 5 * (prev2[av_clip(x + k*3, 0, end)] + \
216 next2[av_clip(x - k*3, 0, end)]) + \
217 1 * (prev3[av_clip(x + k*5, 0, end)] + \
218 next3[av_clip(x - k*5, 0, end)]) + 16) >> 5, \
219 depth); \
220 }
221
222 MID6(uint8_t, 8)
223 MID6(uint16_t, 16)
224
225 #define DIFF(type, ss) \
226 static unsigned diff_##ss(const type *const prev, \
227 const type *const next, \
228 int end, int x, int k, int j) \
229 { \
230 return FFABS(prev[av_clip(x + k + j, 0, end)] - \
231 next[av_clip(x - k + j, 0, end)]); \
232 }
233
234 DIFF(uint8_t, 8)
235 DIFF(uint16_t, 16)
236
237 #define COST(type, ss) \
238 static unsigned cost_##ss(const type *const prev, \
239 const type *const next, \
240 int end, int x, int k) \
241 { \
242 const int m = midl_##ss(prev, next, end, x, k); \
243 const int p = prev[x]; \
244 const int n = next[x]; \
245 \
246 return FFABS(p - m) + FFABS(n - m); \
247 }
248
249 COST(uint8_t, 8)
250 COST(uint16_t, 16)
251
252 #define INTERPOLATE(type, atype, max, ss) \
253 static void interpolate_##ss(ESTDIFContext *s, uint8_t *ddst, \
254 const uint8_t *const pprev_line, \
255 const uint8_t *const nnext_line, \
256 const uint8_t *const pprev2_line, \
257 const uint8_t *const nnext2_line, \
258 const uint8_t *const pprev3_line, \
259 const uint8_t *const nnext3_line, \
260 int x, int width, int rslope, \
261 int redge, unsigned h, int depth, \
262 int *K) \
263 { \
264 type *dst = (type *)ddst; \
265 const type *const prev_line = (const type *const)pprev_line; \
266 const type *const prev2_line = (const type *const)pprev2_line; \
267 const type *const prev3_line = (const type *const)pprev3_line; \
268 const type *const next_line = (const type *const)nnext_line; \
269 const type *const next2_line = (const type *const)nnext2_line; \
270 const type *const next3_line = (const type *const)nnext3_line; \
271 const int interp = s->interp; \
272 const int end = width - 1; \
273 const atype f = redge + 2; \
274 atype sd[S], sD[S], di = 0; \
275 atype dmin = max; \
276 int k = *K; \
277 \
278 for (int i = -rslope; i <= rslope && abs(k) > rslope; i++) { \
279 atype sum = 0; \
280 \
281 for (int j = -redge; j <= redge; j++) { \
282 sum += diff_##ss(prev_line, next_line, end, x, i, j); \
283 sum += diff_##ss(prev2_line, prev_line, end, x, i, j); \
284 sum += diff_##ss(next_line, next2_line, end, x, i, j); \
285 } \
286 \
287 sD[i + rslope] = sum; \
288 sD[i + rslope] += f * cost_##ss(prev_line, next_line, end, x, i); \
289 sD[i + rslope] += h * abs(i); \
290 \
291 dmin = FFMIN(sD[i + rslope], dmin); \
292 } \
293 \
294 for (int i = -rslope; i <= rslope; i++) { \
295 atype sum = 0; \
296 \
297 for (int j = -redge; j <= redge; j++) { \
298 sum += diff_##ss(prev_line, next_line, end, x, k + i, j); \
299 sum += diff_##ss(prev2_line, prev_line, end, x, k + i, j); \
300 sum += diff_##ss(next_line, next2_line, end, x, k + i, j); \
301 } \
302 \
303 sd[i + rslope] = sum; \
304 sd[i + rslope] += f * cost_##ss(prev_line, next_line, end, x, k + i); \
305 sd[i + rslope] += h * abs(k + i); \
306 \
307 dmin = FFMIN(sd[i + rslope], dmin); \
308 } \
309 \
310 for (int i = -rslope; i <= rslope && abs(k) > rslope; i++) { \
311 if (dmin == sD[i + rslope]) { \
312 di = 1; \
313 k = i; \
314 break; \
315 } \
316 } \
317 \
318 for (int i = -rslope; i <= rslope && !di; i++) { \
319 if (dmin == sd[i + rslope]) { \
320 k += i; \
321 break; \
322 } \
323 } \
324 \
325 dst[x] = s->mid_##ss[interp](prev_line, next_line, \
326 prev2_line, next2_line, \
327 prev3_line, next3_line, \
328 end, x, k, depth); \
329 \
330 *K = k; \
331 }
332
333 INTERPOLATE(uint8_t, unsigned, UINT_MAX, 8)
334 INTERPOLATE(uint16_t, uint64_t, UINT64_MAX, 16)
335
deinterlace_slice(AVFilterContext * ctx,void * arg,int jobnr,int nb_jobs)336 static int deinterlace_slice(AVFilterContext *ctx, void *arg,
337 int jobnr, int nb_jobs)
338 {
339 ESTDIFContext *s = ctx->priv;
340 ThreadData *td = arg;
341 AVFrame *out = td->out;
342 AVFrame *in = td->in;
343 const int rslope = s->rslope;
344 const int redge = s->redge;
345 const int half = s->half;
346 const int depth = s->depth;
347 const int interlaced = in->interlaced_frame;
348 const int tff = (s->field == (s->parity == -1 ? interlaced ? in->top_field_first : 1 :
349 s->parity ^ 1));
350
351 for (int plane = 0; plane < s->nb_planes; plane++) {
352 const uint8_t *src_data = in->data[plane];
353 uint8_t *dst_data = out->data[plane];
354 const int linesize = s->linesize[plane];
355 const int width = s->planewidth[plane];
356 const int height = s->planeheight[plane];
357 const int src_linesize = in->linesize[plane];
358 const int dst_linesize = out->linesize[plane];
359 const int start = (height * jobnr) / nb_jobs;
360 const int end = (height * (jobnr+1)) / nb_jobs;
361 const uint8_t *prev_line, *prev2_line, *next_line, *next2_line, *in_line;
362 const uint8_t *prev3_line, *next3_line;
363 uint8_t *out_line;
364 int y_out;
365
366 y_out = start + (tff ^ (start & 1));
367
368 in_line = src_data + (y_out * src_linesize);
369 out_line = dst_data + (y_out * dst_linesize);
370
371 while (y_out < end) {
372 memcpy(out_line, in_line, linesize);
373 y_out += 2;
374 in_line += src_linesize * 2;
375 out_line += dst_linesize * 2;
376 }
377
378 y_out = start + ((!tff) ^ (start & 1));
379 out_line = dst_data + (y_out * dst_linesize);
380
381 for (int y = y_out; y < end; y += 2) {
382 int y_prev3_in = y - 5;
383 int y_next3_in = y + 5;
384 int y_prev2_in = y - 3;
385 int y_next2_in = y + 3;
386 int y_prev_in = y - 1;
387 int y_next_in = y + 1;
388 int k;
389
390 while (y_prev3_in < 0)
391 y_prev3_in += 2;
392
393 while (y_next3_in >= height)
394 y_next3_in -= 2;
395
396 while (y_prev2_in < 0)
397 y_prev2_in += 2;
398
399 while (y_next2_in >= height)
400 y_next2_in -= 2;
401
402 while (y_prev_in < 0)
403 y_prev_in += 2;
404
405 while (y_next_in >= height)
406 y_next_in -= 2;
407
408 prev3_line = src_data + (y_prev3_in * src_linesize);
409 next3_line = src_data + (y_next3_in * src_linesize);
410
411 prev2_line = src_data + (y_prev2_in * src_linesize);
412 next2_line = src_data + (y_next2_in * src_linesize);
413
414 prev_line = src_data + (y_prev_in * src_linesize);
415 next_line = src_data + (y_next_in * src_linesize);
416
417 k = 0;
418
419 for (int x = 0; x < width; x++) {
420 s->interpolate(s, out_line,
421 prev_line, next_line,
422 prev2_line, next2_line,
423 prev3_line, next3_line,
424 x, width, rslope, redge, half, depth, &k);
425 }
426
427 out_line += 2 * dst_linesize;
428 }
429 }
430
431 return 0;
432 }
433
filter(AVFilterContext * ctx,int is_second,AVFrame * in)434 static int filter(AVFilterContext *ctx, int is_second, AVFrame *in)
435 {
436 ESTDIFContext *s = ctx->priv;
437 AVFilterLink *outlink = ctx->outputs[0];
438 AVFrame *out;
439 ThreadData td;
440
441 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
442 if (!out)
443 return AVERROR(ENOMEM);
444 av_frame_copy_props(out, in);
445 out->interlaced_frame = 0;
446 out->pts = s->pts;
447
448 td.out = out; td.in = in;
449 ctx->internal->execute(ctx, deinterlace_slice, &td, NULL,
450 FFMIN(s->planeheight[1] / 2, s->nb_threads));
451
452 if (s->mode)
453 s->field = !s->field;
454
455 return ff_filter_frame(outlink, out);
456 }
457
config_input(AVFilterLink * inlink)458 static int config_input(AVFilterLink *inlink)
459 {
460 AVFilterContext *ctx = inlink->dst;
461 ESTDIFContext *s = ctx->priv;
462 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
463 int ret;
464
465 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
466 return ret;
467
468 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
469 s->planeheight[0] = s->planeheight[3] = inlink->h;
470 s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
471 s->planewidth[0] = s->planewidth[3] = inlink->w;
472
473 if (inlink->h < 3) {
474 av_log(ctx, AV_LOG_ERROR, "Video of less than 3 lines is not supported\n");
475 return AVERROR(EINVAL);
476 }
477
478 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
479 s->nb_threads = ff_filter_get_nb_threads(ctx);
480 s->depth = desc->comp[0].depth;
481 s->interpolate = s->depth <= 8 ? interpolate_8 : interpolate_16;
482 s->mid_8[0] = mid2_8;
483 s->mid_8[1] = mid4_8;
484 s->mid_8[2] = mid6_8;
485 s->mid_16[0] = mid2_16;
486 s->mid_16[1] = mid4_16;
487 s->mid_16[2] = mid6_16;
488 s->half = 1 << (s->depth - 1);
489
490 return 0;
491 }
filter_frame(AVFilterLink * inlink,AVFrame * in)492 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
493 {
494 AVFilterContext *ctx = inlink->dst;
495 ESTDIFContext *s = ctx->priv;
496 int ret;
497
498 if (!s->prev) {
499 s->prev = in;
500 return 0;
501 }
502
503 if ((s->deint && !in->interlaced_frame) || ctx->is_disabled) {
504 s->prev->pts *= 2;
505 ret = ff_filter_frame(ctx->outputs[0], s->prev);
506 s->prev = in;
507 return ret;
508 }
509
510 s->pts = s->prev->pts * 2;
511 ret = filter(ctx, 0, s->prev);
512 if (ret < 0 || s->mode == 0) {
513 av_frame_free(&s->prev);
514 s->prev = in;
515 return ret;
516 }
517
518 s->pts = s->prev->pts + in->pts;
519 ret = filter(ctx, 1, s->prev);
520 av_frame_free(&s->prev);
521 s->prev = in;
522 return ret;
523 }
524
request_frame(AVFilterLink * link)525 static int request_frame(AVFilterLink *link)
526 {
527 AVFilterContext *ctx = link->src;
528 ESTDIFContext *s = ctx->priv;
529 int ret;
530
531 if (s->eof)
532 return AVERROR_EOF;
533
534 ret = ff_request_frame(ctx->inputs[0]);
535
536 if (ret == AVERROR_EOF && s->prev) {
537 AVFrame *next = av_frame_clone(s->prev);
538
539 if (!next)
540 return AVERROR(ENOMEM);
541
542 next->pts = s->prev->pts + av_rescale_q(1, av_inv_q(ctx->outputs[0]->frame_rate),
543 ctx->outputs[0]->time_base);
544 s->eof = 1;
545 ret = filter_frame(ctx->inputs[0], next);
546 } else if (ret < 0) {
547 return ret;
548 }
549
550 return ret;
551 }
552
uninit(AVFilterContext * ctx)553 static av_cold void uninit(AVFilterContext *ctx)
554 {
555 ESTDIFContext *s = ctx->priv;
556
557 av_frame_free(&s->prev);
558 }
559
560 static const AVFilterPad estdif_inputs[] = {
561 {
562 .name = "default",
563 .type = AVMEDIA_TYPE_VIDEO,
564 .filter_frame = filter_frame,
565 .config_props = config_input,
566 },
567 { NULL }
568 };
569
570 static const AVFilterPad estdif_outputs[] = {
571 {
572 .name = "default",
573 .type = AVMEDIA_TYPE_VIDEO,
574 .config_props = config_output,
575 .request_frame = request_frame,
576 },
577 { NULL }
578 };
579
580 AVFilter ff_vf_estdif = {
581 .name = "estdif",
582 .description = NULL_IF_CONFIG_SMALL("Apply Edge Slope Tracing deinterlace."),
583 .priv_size = sizeof(ESTDIFContext),
584 .priv_class = &estdif_class,
585 .uninit = uninit,
586 .query_formats = query_formats,
587 .inputs = estdif_inputs,
588 .outputs = estdif_outputs,
589 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
590 .process_command = ff_filter_process_command,
591 };
592