1 /*
2 * Copyright (c) 2017 Paul B Mahol
3 * Copyright (c) 2007-2016 David Robillard <http://drobilla.net>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * LV2 wrapper
25 */
26
27 #include <lilv/lilv.h>
28 #include <lv2/lv2plug.in/ns/ext/atom/atom.h>
29 #include <lv2/lv2plug.in/ns/ext/buf-size/buf-size.h>
30
31 #include "libavutil/avstring.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/opt.h"
34 #include "audio.h"
35 #include "avfilter.h"
36 #include "internal.h"
37
38 typedef struct URITable {
39 char **uris;
40 size_t n_uris;
41 } URITable;
42
43 typedef struct LV2Context {
44 const AVClass *class;
45 char *plugin_uri;
46 char *options;
47
48 unsigned nb_inputs;
49 unsigned nb_inputcontrols;
50 unsigned nb_outputs;
51
52 int sample_rate;
53 int nb_samples;
54 int64_t pts;
55 int64_t duration;
56
57 LilvWorld *world;
58 const LilvPlugin *plugin;
59 uint32_t nb_ports;
60 float *values;
61 URITable uri_table;
62 LV2_URID_Map map;
63 LV2_Feature map_feature;
64 LV2_URID_Unmap unmap;
65 LV2_Feature unmap_feature;
66 LV2_Atom_Sequence seq_in[2];
67 LV2_Atom_Sequence *seq_out;
68 const LV2_Feature *features[5];
69
70 float *mins;
71 float *maxes;
72 float *controls;
73
74 LilvInstance *instance;
75
76 LilvNode *atom_AtomPort;
77 LilvNode *atom_Sequence;
78 LilvNode *lv2_AudioPort;
79 LilvNode *lv2_CVPort;
80 LilvNode *lv2_ControlPort;
81 LilvNode *lv2_Optional;
82 LilvNode *lv2_InputPort;
83 LilvNode *lv2_OutputPort;
84 LilvNode *urid_map;
85 LilvNode *powerOf2BlockLength;
86 LilvNode *fixedBlockLength;
87 LilvNode *boundedBlockLength;
88 } LV2Context;
89
90 #define OFFSET(x) offsetof(LV2Context, x)
91 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
92
93 static const AVOption lv2_options[] = {
94 { "plugin", "set plugin uri", OFFSET(plugin_uri), AV_OPT_TYPE_STRING, .flags = FLAGS },
95 { "p", "set plugin uri", OFFSET(plugin_uri), AV_OPT_TYPE_STRING, .flags = FLAGS },
96 { "controls", "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },
97 { "c", "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },
98 { "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },
99 { "s", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },
100 { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
101 { "n", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
102 { "duration", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
103 { "d", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
104 { NULL }
105 };
106
107 AVFILTER_DEFINE_CLASS(lv2);
108
uri_table_init(URITable * table)109 static void uri_table_init(URITable *table)
110 {
111 table->uris = NULL;
112 table->n_uris = 0;
113 }
114
uri_table_destroy(URITable * table)115 static void uri_table_destroy(URITable *table)
116 {
117 int i;
118
119 for (i = 0; i < table->n_uris; i++) {
120 av_freep(&table->uris[i]);
121 }
122
123 av_freep(&table->uris);
124 }
125
uri_table_map(LV2_URID_Map_Handle handle,const char * uri)126 static LV2_URID uri_table_map(LV2_URID_Map_Handle handle, const char *uri)
127 {
128 URITable *table = (URITable*)handle;
129 const size_t len = strlen(uri);
130 size_t i;
131 char **tmp;
132
133 for (i = 0; i < table->n_uris; i++) {
134 if (!strcmp(table->uris[i], uri)) {
135 return i + 1;
136 }
137 }
138
139 tmp = av_calloc(table->n_uris + 1, sizeof(char*));
140 if (!tmp)
141 return table->n_uris;
142 memcpy(tmp, table->uris, table->n_uris * sizeof(char**));
143
144 av_free(table->uris);
145 table->uris = tmp;
146 table->uris[table->n_uris] = av_malloc(len + 1);
147 if (!table->uris[table->n_uris])
148 return table->n_uris;
149
150 memcpy(table->uris[table->n_uris], uri, len + 1);
151 table->n_uris++;
152
153 return table->n_uris;
154 }
155
uri_table_unmap(LV2_URID_Map_Handle handle,LV2_URID urid)156 static const char *uri_table_unmap(LV2_URID_Map_Handle handle, LV2_URID urid)
157 {
158 URITable *table = (URITable*)handle;
159
160 if (urid > 0 && urid <= table->n_uris) {
161 return table->uris[urid - 1];
162 }
163
164 return NULL;
165 }
166
connect_ports(LV2Context * s,AVFrame * in,AVFrame * out)167 static void connect_ports(LV2Context *s, AVFrame *in, AVFrame *out)
168 {
169 int ich = 0, och = 0, i;
170
171 for (i = 0; i < s->nb_ports; i++) {
172 const LilvPort *port = lilv_plugin_get_port_by_index(s->plugin, i);
173
174 if (lilv_port_is_a(s->plugin, port, s->lv2_AudioPort) ||
175 lilv_port_is_a(s->plugin, port, s->lv2_CVPort)) {
176 if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort)) {
177 lilv_instance_connect_port(s->instance, i, in->extended_data[ich++]);
178 } else if (lilv_port_is_a(s->plugin, port, s->lv2_OutputPort)) {
179 lilv_instance_connect_port(s->instance, i, out->extended_data[och++]);
180 } else {
181 av_log(s, AV_LOG_WARNING, "port %d neither input nor output, skipping\n", i);
182 }
183 } else if (lilv_port_is_a(s->plugin, port, s->atom_AtomPort)) {
184 if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort)) {
185 lilv_instance_connect_port(s->instance, i, &s->seq_in);
186 } else {
187 lilv_instance_connect_port(s->instance, i, s->seq_out);
188 }
189 } else if (lilv_port_is_a(s->plugin, port, s->lv2_ControlPort)) {
190 lilv_instance_connect_port(s->instance, i, &s->controls[i]);
191 }
192 }
193
194 s->seq_in[0].atom.size = sizeof(LV2_Atom_Sequence_Body);
195 s->seq_in[0].atom.type = uri_table_map(&s->uri_table, LV2_ATOM__Sequence);
196 s->seq_out->atom.size = 9624;
197 s->seq_out->atom.type = uri_table_map(&s->uri_table, LV2_ATOM__Chunk);
198 }
199
filter_frame(AVFilterLink * inlink,AVFrame * in)200 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
201 {
202 AVFilterContext *ctx = inlink->dst;
203 LV2Context *s = ctx->priv;
204 AVFrame *out;
205
206 if (!s->nb_outputs ||
207 (av_frame_is_writable(in) && s->nb_inputs == s->nb_outputs)) {
208 out = in;
209 } else {
210 out = ff_get_audio_buffer(ctx->outputs[0], in->nb_samples);
211 if (!out) {
212 av_frame_free(&in);
213 return AVERROR(ENOMEM);
214 }
215 av_frame_copy_props(out, in);
216 }
217
218 connect_ports(s, in, out);
219
220 lilv_instance_run(s->instance, in->nb_samples);
221
222 if (out != in)
223 av_frame_free(&in);
224
225 return ff_filter_frame(ctx->outputs[0], out);
226 }
227
request_frame(AVFilterLink * outlink)228 static int request_frame(AVFilterLink *outlink)
229 {
230 AVFilterContext *ctx = outlink->src;
231 LV2Context *s = ctx->priv;
232 AVFrame *out;
233 int64_t t;
234
235 if (ctx->nb_inputs)
236 return ff_request_frame(ctx->inputs[0]);
237
238 t = av_rescale(s->pts, AV_TIME_BASE, s->sample_rate);
239 if (s->duration >= 0 && t >= s->duration)
240 return AVERROR_EOF;
241
242 out = ff_get_audio_buffer(outlink, s->nb_samples);
243 if (!out)
244 return AVERROR(ENOMEM);
245
246 connect_ports(s, out, out);
247
248 lilv_instance_run(s->instance, out->nb_samples);
249
250 out->sample_rate = s->sample_rate;
251 out->pts = s->pts;
252 s->pts += s->nb_samples;
253
254 return ff_filter_frame(outlink, out);
255 }
256
257 static const LV2_Feature buf_size_features[3] = {
258 { LV2_BUF_SIZE__powerOf2BlockLength, NULL },
259 { LV2_BUF_SIZE__fixedBlockLength, NULL },
260 { LV2_BUF_SIZE__boundedBlockLength, NULL },
261 };
262
config_output(AVFilterLink * outlink)263 static int config_output(AVFilterLink *outlink)
264 {
265 AVFilterContext *ctx = outlink->src;
266 LV2Context *s = ctx->priv;
267 char *p, *arg, *saveptr = NULL;
268 int i, sample_rate;
269
270 uri_table_init(&s->uri_table);
271 s->map.handle = &s->uri_table;
272 s->map.map = uri_table_map;
273 s->map_feature.URI = LV2_URID_MAP_URI;
274 s->map_feature.data = &s->map;
275 s->unmap.handle = &s->uri_table;
276 s->unmap.unmap = uri_table_unmap;
277 s->unmap_feature.URI = LV2_URID_UNMAP_URI;
278 s->unmap_feature.data = &s->unmap;
279 s->features[0] = &s->map_feature;
280 s->features[1] = &s->unmap_feature;
281 s->features[2] = &buf_size_features[0];
282 s->features[3] = &buf_size_features[1];
283 s->features[4] = &buf_size_features[2];
284
285 if (ctx->nb_inputs) {
286 AVFilterLink *inlink = ctx->inputs[0];
287
288 outlink->format = inlink->format;
289 outlink->sample_rate = sample_rate = inlink->sample_rate;
290 if (s->nb_inputs == s->nb_outputs) {
291 int ret;
292 if ((ret = av_channel_layout_copy(&outlink->ch_layout, &inlink->ch_layout)) < 0)
293 return ret;
294 #if FF_API_OLD_CHANNEL_LAYOUT
295 FF_DISABLE_DEPRECATION_WARNINGS
296 outlink->channel_layout = inlink->channel_layout;
297 FF_ENABLE_DEPRECATION_WARNINGS
298 #endif
299 }
300
301 } else {
302 outlink->sample_rate = sample_rate = s->sample_rate;
303 outlink->time_base = (AVRational){1, s->sample_rate};
304 }
305
306 s->instance = lilv_plugin_instantiate(s->plugin, sample_rate, s->features);
307 if (!s->instance) {
308 av_log(s, AV_LOG_ERROR, "Failed to instantiate <%s>\n", lilv_node_as_uri(lilv_plugin_get_uri(s->plugin)));
309 return AVERROR(EINVAL);
310 }
311
312 s->mins = av_calloc(s->nb_ports, sizeof(float));
313 s->maxes = av_calloc(s->nb_ports, sizeof(float));
314 s->controls = av_calloc(s->nb_ports, sizeof(float));
315
316 if (!s->mins || !s->maxes || !s->controls)
317 return AVERROR(ENOMEM);
318
319 lilv_plugin_get_port_ranges_float(s->plugin, s->mins, s->maxes, s->controls);
320 s->seq_out = av_malloc(sizeof(LV2_Atom_Sequence) + 9624);
321 if (!s->seq_out)
322 return AVERROR(ENOMEM);
323
324 if (s->options && !strcmp(s->options, "help")) {
325 if (!s->nb_inputcontrols) {
326 av_log(ctx, AV_LOG_INFO,
327 "The '%s' plugin does not have any input controls.\n",
328 s->plugin_uri);
329 } else {
330 av_log(ctx, AV_LOG_INFO,
331 "The '%s' plugin has the following input controls:\n",
332 s->plugin_uri);
333 for (i = 0; i < s->nb_ports; i++) {
334 const LilvPort *port = lilv_plugin_get_port_by_index(s->plugin, i);
335 const LilvNode *symbol = lilv_port_get_symbol(s->plugin, port);
336 LilvNode *name = lilv_port_get_name(s->plugin, port);
337
338 if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort) &&
339 lilv_port_is_a(s->plugin, port, s->lv2_ControlPort)) {
340 av_log(ctx, AV_LOG_INFO, "%s\t\t<float> (from %f to %f) (default %f)\t\t%s\n",
341 lilv_node_as_string(symbol), s->mins[i], s->maxes[i], s->controls[i],
342 lilv_node_as_string(name));
343 }
344
345 lilv_node_free(name);
346 }
347 }
348 return AVERROR_EXIT;
349 }
350
351 p = s->options;
352 while (s->options) {
353 const LilvPort *port;
354 LilvNode *sym;
355 float val;
356 char *str, *vstr;
357 int index;
358
359 if (!(arg = av_strtok(p, " |", &saveptr)))
360 break;
361 p = NULL;
362
363 vstr = strstr(arg, "=");
364 if (vstr == NULL) {
365 av_log(ctx, AV_LOG_ERROR, "Invalid syntax.\n");
366 return AVERROR(EINVAL);
367 }
368
369 vstr[0] = 0;
370 str = arg;
371 val = atof(vstr+1);
372 sym = lilv_new_string(s->world, str);
373 port = lilv_plugin_get_port_by_symbol(s->plugin, sym);
374 lilv_node_free(sym);
375 if (!port) {
376 av_log(s, AV_LOG_WARNING, "Unknown option: <%s>\n", str);
377 } else {
378 index = lilv_port_get_index(s->plugin, port);
379 s->controls[index] = val;
380 }
381 }
382
383 if (s->nb_inputs &&
384 (lilv_plugin_has_feature(s->plugin, s->powerOf2BlockLength) ||
385 lilv_plugin_has_feature(s->plugin, s->fixedBlockLength) ||
386 lilv_plugin_has_feature(s->plugin, s->boundedBlockLength))) {
387 AVFilterLink *inlink = ctx->inputs[0];
388
389 inlink->min_samples = inlink->max_samples = 4096;
390 }
391
392 return 0;
393 }
394
init(AVFilterContext * ctx)395 static av_cold int init(AVFilterContext *ctx)
396 {
397 LV2Context *s = ctx->priv;
398 const LilvPlugins *plugins;
399 const LilvPlugin *plugin;
400 AVFilterPad pad = { NULL };
401 LilvNode *uri;
402 int i, ret;
403
404 s->world = lilv_world_new();
405 if (!s->world)
406 return AVERROR(ENOMEM);
407
408 uri = lilv_new_uri(s->world, s->plugin_uri);
409 if (!uri) {
410 av_log(s, AV_LOG_ERROR, "Invalid plugin URI <%s>\n", s->plugin_uri);
411 return AVERROR(EINVAL);
412 }
413
414 lilv_world_load_all(s->world);
415 plugins = lilv_world_get_all_plugins(s->world);
416 plugin = lilv_plugins_get_by_uri(plugins, uri);
417 lilv_node_free(uri);
418
419 if (!plugin) {
420 av_log(s, AV_LOG_ERROR, "Plugin <%s> not found\n", s->plugin_uri);
421 return AVERROR(EINVAL);
422 }
423
424 s->plugin = plugin;
425 s->nb_ports = lilv_plugin_get_num_ports(s->plugin);
426
427 s->lv2_InputPort = lilv_new_uri(s->world, LV2_CORE__InputPort);
428 s->lv2_OutputPort = lilv_new_uri(s->world, LV2_CORE__OutputPort);
429 s->lv2_AudioPort = lilv_new_uri(s->world, LV2_CORE__AudioPort);
430 s->lv2_ControlPort = lilv_new_uri(s->world, LV2_CORE__ControlPort);
431 s->lv2_Optional = lilv_new_uri(s->world, LV2_CORE__connectionOptional);
432 s->atom_AtomPort = lilv_new_uri(s->world, LV2_ATOM__AtomPort);
433 s->atom_Sequence = lilv_new_uri(s->world, LV2_ATOM__Sequence);
434 s->urid_map = lilv_new_uri(s->world, LV2_URID__map);
435 s->powerOf2BlockLength = lilv_new_uri(s->world, LV2_BUF_SIZE__powerOf2BlockLength);
436 s->fixedBlockLength = lilv_new_uri(s->world, LV2_BUF_SIZE__fixedBlockLength);
437 s->boundedBlockLength = lilv_new_uri(s->world, LV2_BUF_SIZE__boundedBlockLength);
438
439 for (i = 0; i < s->nb_ports; i++) {
440 const LilvPort *lport = lilv_plugin_get_port_by_index(s->plugin, i);
441 int is_input = 0;
442 int is_optional = 0;
443
444 is_optional = lilv_port_has_property(s->plugin, lport, s->lv2_Optional);
445
446 if (lilv_port_is_a(s->plugin, lport, s->lv2_InputPort)) {
447 is_input = 1;
448 } else if (!lilv_port_is_a(s->plugin, lport, s->lv2_OutputPort) && !is_optional) {
449 return AVERROR(EINVAL);
450 }
451
452 if (lilv_port_is_a(s->plugin, lport, s->lv2_ControlPort)) {
453 if (is_input) {
454 s->nb_inputcontrols++;
455 }
456 } else if (lilv_port_is_a(s->plugin, lport, s->lv2_AudioPort)) {
457 if (is_input) {
458 s->nb_inputs++;
459 } else {
460 s->nb_outputs++;
461 }
462 }
463 }
464
465 pad.type = AVMEDIA_TYPE_AUDIO;
466
467 if (s->nb_inputs) {
468 pad.name = av_asprintf("in0:%s:%u", s->plugin_uri, s->nb_inputs);
469 if (!pad.name)
470 return AVERROR(ENOMEM);
471
472 pad.filter_frame = filter_frame;
473 if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
474 return ret;
475 }
476
477 return 0;
478 }
479
query_formats(AVFilterContext * ctx)480 static int query_formats(AVFilterContext *ctx)
481 {
482 LV2Context *s = ctx->priv;
483 AVFilterChannelLayouts *layouts;
484 AVFilterLink *outlink = ctx->outputs[0];
485 static const enum AVSampleFormat sample_fmts[] = {
486 AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
487 int ret = ff_set_common_formats_from_list(ctx, sample_fmts);
488 if (ret < 0)
489 return ret;
490
491 if (s->nb_inputs) {
492 ret = ff_set_common_all_samplerates(ctx);
493 if (ret < 0)
494 return ret;
495 } else {
496 int sample_rates[] = { s->sample_rate, -1 };
497
498 ret = ff_set_common_samplerates_from_list(ctx, sample_rates);
499 if (ret < 0)
500 return ret;
501 }
502
503 if (s->nb_inputs == 2 && s->nb_outputs == 2) {
504 layouts = NULL;
505 ret = ff_add_channel_layout(&layouts, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO);
506 if (ret < 0)
507 return ret;
508 ret = ff_set_common_channel_layouts(ctx, layouts);
509 if (ret < 0)
510 return ret;
511 } else {
512 if (s->nb_inputs >= 1) {
513 AVFilterLink *inlink = ctx->inputs[0];
514 AVChannelLayout inlayout = FF_COUNT2LAYOUT(s->nb_inputs);
515
516 layouts = NULL;
517 ret = ff_add_channel_layout(&layouts, &inlayout);
518 if (ret < 0)
519 return ret;
520 ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts);
521 if (ret < 0)
522 return ret;
523
524 if (!s->nb_outputs) {
525 ret = ff_channel_layouts_ref(layouts, &outlink->incfg.channel_layouts);
526 if (ret < 0)
527 return ret;
528 }
529 }
530
531 if (s->nb_outputs >= 1) {
532 AVChannelLayout outlayout = FF_COUNT2LAYOUT(s->nb_outputs);
533
534 layouts = NULL;
535 ret = ff_add_channel_layout(&layouts, &outlayout);
536 if (ret < 0)
537 return ret;
538 ret = ff_channel_layouts_ref(layouts, &outlink->incfg.channel_layouts);
539 if (ret < 0)
540 return ret;
541 }
542 }
543
544 return 0;
545 }
546
process_command(AVFilterContext * ctx,const char * cmd,const char * args,char * res,int res_len,int flags)547 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
548 char *res, int res_len, int flags)
549 {
550 LV2Context *s = ctx->priv;
551 const LilvPort *port;
552 LilvNode *sym;
553 int index;
554
555 sym = lilv_new_string(s->world, cmd);
556 port = lilv_plugin_get_port_by_symbol(s->plugin, sym);
557 lilv_node_free(sym);
558 if (!port) {
559 av_log(s, AV_LOG_WARNING, "Unknown option: <%s>\n", cmd);
560 } else {
561 index = lilv_port_get_index(s->plugin, port);
562 s->controls[index] = atof(args);
563 }
564 return 0;
565 }
566
uninit(AVFilterContext * ctx)567 static av_cold void uninit(AVFilterContext *ctx)
568 {
569 LV2Context *s = ctx->priv;
570
571 lilv_node_free(s->powerOf2BlockLength);
572 lilv_node_free(s->fixedBlockLength);
573 lilv_node_free(s->boundedBlockLength);
574 lilv_node_free(s->urid_map);
575 lilv_node_free(s->atom_Sequence);
576 lilv_node_free(s->atom_AtomPort);
577 lilv_node_free(s->lv2_Optional);
578 lilv_node_free(s->lv2_ControlPort);
579 lilv_node_free(s->lv2_AudioPort);
580 lilv_node_free(s->lv2_OutputPort);
581 lilv_node_free(s->lv2_InputPort);
582 uri_table_destroy(&s->uri_table);
583 lilv_instance_free(s->instance);
584 lilv_world_free(s->world);
585 av_freep(&s->mins);
586 av_freep(&s->maxes);
587 av_freep(&s->controls);
588 av_freep(&s->seq_out);
589 }
590
591 static const AVFilterPad lv2_outputs[] = {
592 {
593 .name = "default",
594 .type = AVMEDIA_TYPE_AUDIO,
595 .config_props = config_output,
596 .request_frame = request_frame,
597 },
598 };
599
600 const AVFilter ff_af_lv2 = {
601 .name = "lv2",
602 .description = NULL_IF_CONFIG_SMALL("Apply LV2 effect."),
603 .priv_size = sizeof(LV2Context),
604 .priv_class = &lv2_class,
605 .init = init,
606 .uninit = uninit,
607 .process_command = process_command,
608 .inputs = 0,
609 FILTER_OUTPUTS(lv2_outputs),
610 FILTER_QUERY_FUNC(query_formats),
611 .flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
612 };
613