FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/avf_avectorscope.c
Date: 2024-04-19 17:50:32
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1 /*
2 * Copyright (c) 2013 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 /**
22 * @file
23 * audio to video multimedia vectorscope filter
24 */
25
26 #include "libavutil/avassert.h"
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/parseutils.h"
30 #include "avfilter.h"
31 #include "filters.h"
32 #include "formats.h"
33 #include "audio.h"
34 #include "video.h"
35 #include "internal.h"
36
37 enum VectorScopeMode {
38 LISSAJOUS,
39 LISSAJOUS_XY,
40 POLAR,
41 MODE_NB,
42 };
43
44 enum VectorScopeDraw {
45 DOT,
46 LINE,
47 AALINE,
48 DRAW_NB,
49 };
50
51 enum VectorScopeScale {
52 LIN,
53 SQRT,
54 CBRT,
55 LOG,
56 SCALE_NB,
57 };
58
59 typedef struct AudioVectorScopeContext {
60 const AVClass *class;
61 AVFrame *outpicref;
62 int w, h;
63 int hw, hh;
64 int mode;
65 int draw;
66 int scale;
67 int contrast[4];
68 int fade[4];
69 double zoom;
70 int swap;
71 int mirror;
72 unsigned prev_x, prev_y;
73 AVRational frame_rate;
74 int nb_samples;
75 } AudioVectorScopeContext;
76
77 #define OFFSET(x) offsetof(AudioVectorScopeContext, x)
78 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
79 #define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
80
81 static const AVOption avectorscope_options[] = {
82 { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, TFLAGS, .unit = "mode" },
83 { "m", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=LISSAJOUS}, 0, MODE_NB-1, TFLAGS, .unit = "mode" },
84 { "lissajous", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS}, 0, 0, TFLAGS, .unit = "mode" },
85 { "lissajous_xy", "", 0, AV_OPT_TYPE_CONST, {.i64=LISSAJOUS_XY}, 0, 0, TFLAGS, .unit = "mode" },
86 { "polar", "", 0, AV_OPT_TYPE_CONST, {.i64=POLAR}, 0, 0, TFLAGS, .unit = "mode" },
87 { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
88 { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
89 { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
90 { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="400x400"}, 0, 0, FLAGS },
91 { "rc", "set red contrast", OFFSET(contrast[0]), AV_OPT_TYPE_INT, {.i64=40}, 0, 255, TFLAGS },
92 { "gc", "set green contrast", OFFSET(contrast[1]), AV_OPT_TYPE_INT, {.i64=160}, 0, 255, TFLAGS },
93 { "bc", "set blue contrast", OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=80}, 0, 255, TFLAGS },
94 { "ac", "set alpha contrast", OFFSET(contrast[3]), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, TFLAGS },
95 { "rf", "set red fade", OFFSET(fade[0]), AV_OPT_TYPE_INT, {.i64=15}, 0, 255, TFLAGS },
96 { "gf", "set green fade", OFFSET(fade[1]), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, TFLAGS },
97 { "bf", "set blue fade", OFFSET(fade[2]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, TFLAGS },
98 { "af", "set alpha fade", OFFSET(fade[3]), AV_OPT_TYPE_INT, {.i64=5}, 0, 255, TFLAGS },
99 { "zoom", "set zoom factor", OFFSET(zoom), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 10, TFLAGS },
100 { "draw", "set draw mode", OFFSET(draw), AV_OPT_TYPE_INT, {.i64=DOT}, 0, DRAW_NB-1, TFLAGS, .unit = "draw" },
101 { "dot", "draw dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT} , 0, 0, TFLAGS, .unit = "draw" },
102 { "line", "draw lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, TFLAGS, .unit = "draw" },
103 { "aaline","draw anti-aliased lines", 0, AV_OPT_TYPE_CONST, {.i64=AALINE},0,0, TFLAGS, .unit = "draw" },
104 { "scale", "set amplitude scale mode", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LIN}, 0, SCALE_NB-1, TFLAGS, .unit = "scale" },
105 { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LIN}, 0, 0, TFLAGS, .unit = "scale" },
106 { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT}, 0, 0, TFLAGS, .unit = "scale" },
107 { "cbrt", "cube root", 0, AV_OPT_TYPE_CONST, {.i64=CBRT}, 0, 0, TFLAGS, .unit = "scale" },
108 { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, TFLAGS, .unit = "scale" },
109 { "swap", "swap x axis with y axis", OFFSET(swap), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, TFLAGS },
110 { "mirror", "mirror axis", OFFSET(mirror), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, TFLAGS, .unit = "mirror" },
111 { "none", "no mirror", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, TFLAGS, .unit = "mirror" },
112 { "x", "mirror x", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, TFLAGS, .unit = "mirror" },
113 { "y", "mirror y", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, TFLAGS, .unit = "mirror" },
114 { "xy", "mirror both", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, TFLAGS, .unit = "mirror" },
115 { NULL }
116 };
117
118 AVFILTER_DEFINE_CLASS(avectorscope);
119
120 ✗ static void draw_dot(AudioVectorScopeContext *s, unsigned x, unsigned y, int value)
121 {
122 ✗ const ptrdiff_t linesize = s->outpicref->linesize[0];
123 uint8_t *dst;
124
125 ✗ if (s->zoom > 1) {
126 ✗ if (y >= s->h || x >= s->w)
127 ✗ return;
128 } else {
129 ✗ y = FFMIN(y, s->h - 1);
130 ✗ x = FFMIN(x, s->w - 1);
131 }
132
133 ✗ dst = s->outpicref->data[0] + y * linesize + x * 4;
134 ✗ dst[0] = FFMIN(dst[0] + s->contrast[0], value);
135 ✗ dst[1] = FFMIN(dst[1] + s->contrast[1], value);
136 ✗ dst[2] = FFMIN(dst[2] + s->contrast[2], value);
137 ✗ dst[3] = FFMIN(dst[3] + s->contrast[3], value);
138 }
139
140 ✗ static void draw_line(AudioVectorScopeContext *s, int x0, int y0, int x1, int y1)
141 {
142 ✗ int dx = FFABS(x1-x0), sx = x0 < x1 ? 1 : -1;
143 ✗ int dy = FFABS(y1-y0), sy = y0 < y1 ? 1 : -1;
144 ✗ int err = (dx>dy ? dx : -dy) / 2, e2;
145
146 for (;;) {
147 ✗ draw_dot(s, x0, y0, 255);
148
149 ✗ if (x0 == x1 && y0 == y1)
150 ✗ break;
151
152 ✗ e2 = err;
153
154 ✗ if (e2 >-dx) {
155 ✗ err -= dy;
156 ✗ x0 += sx;
157 }
158
159 ✗ if (e2 < dy) {
160 ✗ err += dx;
161 ✗ y0 += sy;
162 }
163 }
164 ✗ }
165
166 ✗ static void draw_aaline(AudioVectorScopeContext *s, int x0, int y0, int x1, int y1)
167 {
168 ✗ int sx = x0 < x1 ? 1 : -1, sy = y0 < y1 ? 1 : -1, x2;
169 ✗ int dx = FFABS(x1-x0), dy = FFABS(y1-y0), err = dx * dx + dy * dy;
170 ✗ int e2 = err == 0 ? 1 : 0xffffff / (dx + dy);
171
172 ✗ dx *= e2;
173 ✗ dy *= e2;
174 ✗ err = dx - dy;
175
176 for (;;) {
177 ✗ draw_dot(s, x0, y0, 255-(FFABS(err - dx + dy) >> 16));
178 ✗ e2 = err;
179 ✗ x2 = x0;
180 ✗ if (2 * e2 >= -dx) {
181 ✗ if (x0 == x1)
182 ✗ break;
183 ✗ if (e2 + dy < 0xff0000)
184 ✗ draw_dot(s, x0, y0 + sy, 255-((e2 + dy) >> 16));
185 ✗ err -= dy;
186 ✗ x0 += sx;
187 }
188
189 ✗ if (2 * e2 <= dy) {
190 ✗ if (y0 == y1)
191 ✗ break;
192 ✗ if (dx - e2 < 0xff0000)
193 ✗ draw_dot(s, x2 + sx, y0, 255-((dx - e2) >> 16));
194 ✗ err += dx;
195 ✗ y0 += sy;
196 }
197 }
198 ✗ }
199
200 ✗ static int fade(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
201 {
202 ✗ AudioVectorScopeContext *s = ctx->priv;
203 ✗ const int linesize = s->outpicref->linesize[0];
204 ✗ const int height = s->outpicref->height;
205 ✗ const int slice_start = (height * jobnr ) / nb_jobs;
206 ✗ const int slice_end = (height * (jobnr+1)) / nb_jobs;
207
208 ✗ if (s->fade[0] == 255 && s->fade[1] == 255 && s->fade[2] == 255) {
209 ✗ for (int i = slice_start; i < slice_end; i++)
210 ✗ memset(s->outpicref->data[0] + i * linesize, 0, s->outpicref->width * 4);
211 ✗ return 0;
212 }
213
214 ✗ if (s->fade[0] || s->fade[1] || s->fade[2]) {
215 ✗ uint8_t *d = s->outpicref->data[0] + slice_start * linesize;
216 ✗ for (int i = slice_start; i < slice_end; i++) {
217 ✗ for (int j = 0; j < s->w*4; j+=4) {
218 ✗ if (d[j+0])
219 ✗ d[j+0] = FFMAX(d[j+0] - s->fade[0], 0);
220 ✗ if (d[j+1])
221 ✗ d[j+1] = FFMAX(d[j+1] - s->fade[1], 0);
222 ✗ if (d[j+2])
223 ✗ d[j+2] = FFMAX(d[j+2] - s->fade[2], 0);
224 ✗ if (d[j+3])
225 ✗ d[j+3] = FFMAX(d[j+3] - s->fade[3], 0);
226 }
227 ✗ d += linesize;
228 }
229 }
230
231 ✗ return 0;
232 }
233
234 ✗ static int query_formats(AVFilterContext *ctx)
235 {
236 ✗ AVFilterFormats *formats = NULL;
237 ✗ AVFilterChannelLayouts *layout = NULL;
238 ✗ AVFilterLink *inlink = ctx->inputs[0];
239 ✗ AVFilterLink *outlink = ctx->outputs[0];
240 static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_NONE };
241 static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
242 int ret;
243
244 ✗ formats = ff_make_format_list(sample_fmts);
245 ✗ if ((ret = ff_formats_ref (formats, &inlink->outcfg.formats )) < 0 ||
246 ✗ (ret = ff_add_channel_layout (&layout, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 ||
247 ✗ (ret = ff_channel_layouts_ref (layout , &inlink->outcfg.channel_layouts)) < 0)
248 ✗ return ret;
249
250 ✗ formats = ff_all_samplerates();
251 ✗ if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
252 ✗ return ret;
253
254 ✗ formats = ff_make_format_list(pix_fmts);
255 ✗ if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
256 ✗ return ret;
257
258 ✗ return 0;
259 }
260
261 ✗ static int config_input(AVFilterLink *inlink)
262 {
263 ✗ AVFilterContext *ctx = inlink->dst;
264 ✗ AudioVectorScopeContext *s = ctx->priv;
265
266 ✗ s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
267
268 ✗ return 0;
269 }
270
271 ✗ static int config_output(AVFilterLink *outlink)
272 {
273 ✗ AudioVectorScopeContext *s = outlink->src->priv;
274
275 ✗ outlink->w = s->w;
276 ✗ outlink->h = s->h;
277 ✗ outlink->sample_aspect_ratio = (AVRational){1,1};
278 ✗ outlink->frame_rate = s->frame_rate;
279 ✗ outlink->time_base = av_inv_q(outlink->frame_rate);
280
281 ✗ s->prev_x = s->hw = s->w / 2;
282 ✗ s->prev_y = s->hh = s->mode == POLAR ? s->h - 1 : s->h / 2;
283
284 ✗ return 0;
285 }
286
287 ✗ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
288 {
289 ✗ AVFilterContext *ctx = inlink->dst;
290 ✗ AVFilterLink *outlink = ctx->outputs[0];
291 ✗ const int16_t *samples = (const int16_t *)insamples->data[0];
292 ✗ const float *samplesf = (const float *)insamples->data[0];
293 ✗ AudioVectorScopeContext *s = ctx->priv;
294 ✗ const int hw = s->hw;
295 ✗ const int hh = s->hh;
296 AVFrame *clone;
297 unsigned x, y;
298 ✗ unsigned prev_x = s->prev_x, prev_y = s->prev_y;
299 ✗ double zoom = s->zoom;
300 int ret;
301
302 ✗ if (!s->outpicref || s->outpicref->width != outlink->w ||
303 ✗ s->outpicref->height != outlink->h) {
304 ✗ av_frame_free(&s->outpicref);
305 ✗ s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
306 ✗ if (!s->outpicref) {
307 ✗ av_frame_free(&insamples);
308 ✗ return AVERROR(ENOMEM);
309 }
310
311 ✗ s->outpicref->sample_aspect_ratio = (AVRational){1,1};
312 ✗ for (int i = 0; i < outlink->h; i++)
313 ✗ memset(s->outpicref->data[0] + i * s->outpicref->linesize[0], 0, outlink->w * 4);
314 }
315 ✗ s->outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base);
316 ✗ s->outpicref->duration = 1;
317
318 ✗ ret = ff_inlink_make_frame_writable(outlink, &s->outpicref);
319 ✗ if (ret < 0) {
320 ✗ av_frame_free(&insamples);
321 ✗ return ret;
322 }
323 ✗ ff_filter_execute(ctx, fade, NULL, NULL, FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
324
325 ✗ if (zoom < 1) {
326 ✗ float max = 0;
327
328 ✗ switch (insamples->format) {
329 ✗ case AV_SAMPLE_FMT_S16:
330 ✗ for (int i = 0; i < insamples->nb_samples * 2; i++) {
331 ✗ float sample = samples[i] / (float)INT16_MAX;
332 ✗ max = FFMAX(FFABS(sample), max);
333 }
334 ✗ break;
335 ✗ case AV_SAMPLE_FMT_FLT:
336 ✗ for (int i = 0; i < insamples->nb_samples * 2; i++) {
337 ✗ max = FFMAX(FFABS(samplesf[i]), max);
338 }
339 ✗ break;
340 ✗ default:
341 av_assert2(0);
342 }
343
344 ✗ switch (s->scale) {
345 ✗ case SQRT:
346 ✗ max = sqrtf(max);
347 ✗ break;
348 ✗ case CBRT:
349 ✗ max = cbrtf(max);
350 ✗ break;
351 ✗ case LOG:
352 ✗ max = logf(1 + max) / logf(2);
353 ✗ break;
354 }
355
356 ✗ if (max > 0.f)
357 ✗ zoom = 1. / max;
358 }
359
360 ✗ for (int i = 0; i < insamples->nb_samples; i++) {
361 float src[2];
362
363 ✗ switch (insamples->format) {
364 ✗ case AV_SAMPLE_FMT_S16:
365 ✗ src[0] = samples[i*2+0] / (float)INT16_MAX;
366 ✗ src[1] = samples[i*2+1] / (float)INT16_MAX;
367 ✗ break;
368 ✗ case AV_SAMPLE_FMT_FLT:
369 ✗ src[0] = samplesf[i*2+0];
370 ✗ src[1] = samplesf[i*2+1];
371 ✗ break;
372 ✗ default:
373 av_assert2(0);
374 }
375
376 ✗ switch (s->scale) {
377 ✗ case SQRT:
378 ✗ src[0] = FFSIGN(src[0]) * sqrtf(FFABS(src[0]));
379 ✗ src[1] = FFSIGN(src[1]) * sqrtf(FFABS(src[1]));
380 ✗ break;
381 ✗ case CBRT:
382 ✗ src[0] = FFSIGN(src[0]) * cbrtf(FFABS(src[0]));
383 ✗ src[1] = FFSIGN(src[1]) * cbrtf(FFABS(src[1]));
384 ✗ break;
385 ✗ case LOG:
386 ✗ src[0] = FFSIGN(src[0]) * logf(1 + FFABS(src[0])) / logf(2);
387 ✗ src[1] = FFSIGN(src[1]) * logf(1 + FFABS(src[1])) / logf(2);
388 ✗ break;
389 }
390
391 ✗ if (s->mirror & 1)
392 ✗ src[0] = -src[0];
393
394 ✗ if (s->mirror & 2)
395 ✗ src[1] = -src[1];
396
397 ✗ if (s->swap)
398 ✗ FFSWAP(float, src[0], src[1]);
399
400 ✗ if (s->mode == LISSAJOUS) {
401 ✗ x = ((src[1] - src[0]) * zoom / 2 + 1) * hw;
402 ✗ y = (1.0 - (src[0] + src[1]) * zoom / 2) * hh;
403 ✗ } else if (s->mode == LISSAJOUS_XY) {
404 ✗ x = (src[1] * zoom + 1) * hw;
405 ✗ y = (src[0] * zoom + 1) * hh;
406 } else {
407 float sx, sy, cx, cy;
408
409 ✗ sx = src[1] * zoom;
410 ✗ sy = src[0] * zoom;
411 ✗ cx = sx * sqrtf(1 - 0.5 * sy * sy);
412 ✗ cy = sy * sqrtf(1 - 0.5 * sx * sx);
413 ✗ x = hw + hw * FFSIGN(cx + cy) * (cx - cy) * .7;
414 ✗ y = s->h - s->h * fabsf(cx + cy) * .7;
415 }
416
417 ✗ if (s->draw == DOT) {
418 ✗ draw_dot(s, x, y, 255);
419 ✗ } else if (s->draw == LINE) {
420 ✗ draw_line(s, x, y, prev_x, prev_y);
421 } else {
422 ✗ draw_aaline(s, x, y, prev_x, prev_y);
423 }
424 ✗ prev_x = x;
425 ✗ prev_y = y;
426 }
427
428 ✗ s->prev_x = x, s->prev_y = y;
429 ✗ av_frame_free(&insamples);
430
431 ✗ clone = av_frame_clone(s->outpicref);
432 ✗ if (!clone)
433 ✗ return AVERROR(ENOMEM);
434
435 ✗ return ff_filter_frame(outlink, clone);
436 }
437
438 ✗ static int activate(AVFilterContext *ctx)
439 {
440 ✗ AVFilterLink *inlink = ctx->inputs[0];
441 ✗ AVFilterLink *outlink = ctx->outputs[0];
442 ✗ AudioVectorScopeContext *s = ctx->priv;
443 AVFrame *in;
444 int ret;
445
446 ✗ FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
447
448 ✗ ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
449 ✗ if (ret < 0)
450 ✗ return ret;
451 ✗ if (ret > 0)
452 ✗ return filter_frame(inlink, in);
453
454 ✗ if (ff_inlink_queued_samples(inlink) >= s->nb_samples) {
455 ✗ ff_filter_set_ready(ctx, 10);
456 ✗ return 0;
457 }
458
459 ✗ FF_FILTER_FORWARD_STATUS(inlink, outlink);
460 ✗ FF_FILTER_FORWARD_WANTED(outlink, inlink);
461
462 ✗ return FFERROR_NOT_READY;
463 }
464
465 ✗ static av_cold void uninit(AVFilterContext *ctx)
466 {
467 ✗ AudioVectorScopeContext *s = ctx->priv;
468
469 ✗ av_frame_free(&s->outpicref);
470 ✗ }
471
472 static const AVFilterPad audiovectorscope_inputs[] = {
473 {
474 .name = "default",
475 .type = AVMEDIA_TYPE_AUDIO,
476 .config_props = config_input,
477 },
478 };
479
480 static const AVFilterPad audiovectorscope_outputs[] = {
481 {
482 .name = "default",
483 .type = AVMEDIA_TYPE_VIDEO,
484 .config_props = config_output,
485 },
486 };
487
488 const AVFilter ff_avf_avectorscope = {
489 .name = "avectorscope",
490 .description = NULL_IF_CONFIG_SMALL("Convert input audio to vectorscope video output."),
491 .uninit = uninit,
492 .priv_size = sizeof(AudioVectorScopeContext),
493 .activate = activate,
494 FILTER_INPUTS(audiovectorscope_inputs),
495 FILTER_OUTPUTS(audiovectorscope_outputs),
496 FILTER_QUERY_FUNC(query_formats),
497 .priv_class = &avectorscope_class,
498 .flags = AVFILTER_FLAG_SLICE_THREADS,
499 .process_command = ff_filter_process_command,
500 };
501