libavfilter/af_lv2.c

   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/mem.h"
  34 #include "libavutil/opt.h"
  35 #include "audio.h"
  36 #include "avfilter.h"
  37 #include "filters.h"
  38 #include "formats.h"
  39
  40 typedef struct URITable {
  41     char    **uris;
  42     size_t    n_uris;
  43 } URITable;
  44
  45 typedef struct LV2Context {
  46     const AVClass *class;
  47     char *plugin_uri;
  48     char *options;
  49
  50     unsigned nb_inputs;
  51     unsigned nb_inputcontrols;
  52     unsigned nb_outputs;
  53
  54     int sample_rate;
  55     int nb_samples;
  56     int64_t pts;
  57     int64_t duration;
  58
  59     LilvWorld         *world;
  60     const LilvPlugin  *plugin;
  61     uint32_t           nb_ports;
  62     float             *values;
  63     URITable           uri_table;
  64     LV2_URID_Map       map;
  65     LV2_Feature        map_feature;
  66     LV2_URID_Unmap     unmap;
  67     LV2_Feature        unmap_feature;
  68     LV2_Atom_Sequence  seq_in[2];
  69     LV2_Atom_Sequence *seq_out;
  70     const LV2_Feature *features[5];
  71
  72     float *mins;
  73     float *maxes;
  74     float *controls;
  75
  76     LilvInstance *instance;
  77
  78     LilvNode  *atom_AtomPort;
  79     LilvNode  *atom_Sequence;
  80     LilvNode  *lv2_AudioPort;
  81     LilvNode  *lv2_CVPort;
  82     LilvNode  *lv2_ControlPort;
  83     LilvNode  *lv2_Optional;
  84     LilvNode  *lv2_InputPort;
  85     LilvNode  *lv2_OutputPort;
  86     LilvNode  *urid_map;
  87     LilvNode  *powerOf2BlockLength;
  88     LilvNode  *fixedBlockLength;
  89     LilvNode  *boundedBlockLength;
  90 } LV2Context;
  91
  92 #define OFFSET(x) offsetof(LV2Context, x)
  93 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
  94
  95 static const AVOption lv2_options[] = {
  96     { "plugin", "set plugin uri", OFFSET(plugin_uri), AV_OPT_TYPE_STRING, .flags = FLAGS },
  97     { "p",      "set plugin uri", OFFSET(plugin_uri), AV_OPT_TYPE_STRING, .flags = FLAGS },
  98     { "controls", "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },
  99     { "c",        "set plugin options", OFFSET(options), AV_OPT_TYPE_STRING, .flags = FLAGS },
 100     { "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },
 101     { "s",           "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64=44100}, 1, INT32_MAX, FLAGS },
 102     { "nb_samples", "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
 103     { "n",          "set the number of samples per requested frame", OFFSET(nb_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
 104     { "duration", "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
 105     { "d",        "set audio duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },
 106     { NULL }
 107 };
 108
 109 AVFILTER_DEFINE_CLASS(lv2);
 110
 111 static void uri_table_init(URITable *table)
 112 {
 113     table->uris   = NULL;
 114     table->n_uris = 0;
 115 }
 116
 117 static void uri_table_destroy(URITable *table)
 118 {
 119     int i;
 120
 121     for (i = 0; i < table->n_uris; i++) {
 122         av_freep(&table->uris[i]);
 123     }
 124
 125     av_freep(&table->uris);
 126 }
 127
 128 static LV2_URID uri_table_map(LV2_URID_Map_Handle handle, const char *uri)
 129 {
 130     URITable *table = (URITable*)handle;
 131     const size_t len = strlen(uri);
 132     size_t i;
 133     char **tmp;
 134
 135     for (i = 0; i < table->n_uris; i++) {
 136         if (!strcmp(table->uris[i], uri)) {
 137             return i + 1;
 138         }
 139     }
 140
 141     tmp = av_calloc(table->n_uris + 1, sizeof(char*));
 142     if (!tmp)
 143         return table->n_uris;
 144     memcpy(tmp, table->uris, table->n_uris * sizeof(char**));
 145
 146     av_free(table->uris);
 147     table->uris = tmp;
 148     table->uris[table->n_uris] = av_malloc(len + 1);
 149     if (!table->uris[table->n_uris])
 150         return table->n_uris;
 151
 152     memcpy(table->uris[table->n_uris], uri, len + 1);
 153     table->n_uris++;
 154
 155     return table->n_uris;
 156 }
 157
 158 static const char *uri_table_unmap(LV2_URID_Map_Handle handle, LV2_URID urid)
 159 {
 160     URITable *table = (URITable*)handle;
 161
 162     if (urid > 0 && urid <= table->n_uris) {
 163         return table->uris[urid - 1];
 164     }
 165
 166     return NULL;
 167 }
 168
 169 static void connect_ports(LV2Context *s, AVFrame *in, AVFrame *out)
 170 {
 171     int ich = 0, och = 0, i;
 172
 173     for (i = 0; i < s->nb_ports; i++) {
 174         const LilvPort *port = lilv_plugin_get_port_by_index(s->plugin, i);
 175
 176         if (lilv_port_is_a(s->plugin, port, s->lv2_AudioPort) ||
 177             lilv_port_is_a(s->plugin, port, s->lv2_CVPort)) {
 178             if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort)) {
 179                 lilv_instance_connect_port(s->instance, i, in->extended_data[ich++]);
 180             } else if (lilv_port_is_a(s->plugin, port, s->lv2_OutputPort)) {
 181                 lilv_instance_connect_port(s->instance, i, out->extended_data[och++]);
 182             } else {
 183                 av_log(s, AV_LOG_WARNING, "port %d neither input nor output, skipping\n", i);
 184             }
 185         } else if (lilv_port_is_a(s->plugin, port, s->atom_AtomPort)) {
 186             if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort)) {
 187                 lilv_instance_connect_port(s->instance, i, &s->seq_in);
 188             } else {
 189                 lilv_instance_connect_port(s->instance, i, s->seq_out);
 190             }
 191         } else if (lilv_port_is_a(s->plugin, port, s->lv2_ControlPort)) {
 192             lilv_instance_connect_port(s->instance, i, &s->controls[i]);
 193         }
 194     }
 195
 196     s->seq_in[0].atom.size = sizeof(LV2_Atom_Sequence_Body);
 197     s->seq_in[0].atom.type = uri_table_map(&s->uri_table, LV2_ATOM__Sequence);
 198     s->seq_out->atom.size  = 9624;
 199     s->seq_out->atom.type  = uri_table_map(&s->uri_table, LV2_ATOM__Chunk);
 200 }
 201
 202 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 203 {
 204     AVFilterContext *ctx = inlink->dst;
 205     LV2Context *s = ctx->priv;
 206     AVFrame *out;
 207
 208     if (!s->nb_outputs ||
 209         (av_frame_is_writable(in) && s->nb_inputs == s->nb_outputs)) {
 210         out = in;
 211     } else {
 212         out = ff_get_audio_buffer(ctx->outputs[0], in->nb_samples);
 213         if (!out) {
 214             av_frame_free(&in);
 215             return AVERROR(ENOMEM);
 216         }
 217         av_frame_copy_props(out, in);
 218     }
 219
 220     connect_ports(s, in, out);
 221
 222     lilv_instance_run(s->instance, in->nb_samples);
 223
 224     if (out != in)
 225         av_frame_free(&in);
 226
 227     return ff_filter_frame(ctx->outputs[0], out);
 228 }
 229
 230 static int request_frame(AVFilterLink *outlink)
 231 {
 232     AVFilterContext *ctx = outlink->src;
 233     LV2Context *s = ctx->priv;
 234     AVFrame *out;
 235     int64_t t;
 236
 237     if (ctx->nb_inputs)
 238         return ff_request_frame(ctx->inputs[0]);
 239
 240     t = av_rescale(s->pts, AV_TIME_BASE, s->sample_rate);
 241     if (s->duration >= 0 && t >= s->duration)
 242         return AVERROR_EOF;
 243
 244     out = ff_get_audio_buffer(outlink, s->nb_samples);
 245     if (!out)
 246         return AVERROR(ENOMEM);
 247
 248     connect_ports(s, out, out);
 249
 250     lilv_instance_run(s->instance, out->nb_samples);
 251
 252     out->sample_rate = s->sample_rate;
 253     out->pts         = s->pts;
 254     s->pts          += s->nb_samples;
 255
 256     return ff_filter_frame(outlink, out);
 257 }
 258
 259 static const LV2_Feature buf_size_features[3] = {
 260     { LV2_BUF_SIZE__powerOf2BlockLength, NULL },
 261     { LV2_BUF_SIZE__fixedBlockLength,    NULL },
 262     { LV2_BUF_SIZE__boundedBlockLength,  NULL },
 263 };
 264
 265 static int config_output(AVFilterLink *outlink)
 266 {
 267     AVFilterContext *ctx = outlink->src;
 268     LV2Context *s = ctx->priv;
 269     char *p, *arg, *saveptr = NULL;
 270     int i, sample_rate;
 271
 272     uri_table_init(&s->uri_table);
 273     s->map.handle = &s->uri_table;
 274     s->map.map = uri_table_map;
 275     s->map_feature.URI = LV2_URID_MAP_URI;
 276     s->map_feature.data = &s->map;
 277     s->unmap.handle = &s->uri_table;
 278     s->unmap.unmap  = uri_table_unmap;
 279     s->unmap_feature.URI = LV2_URID_UNMAP_URI;
 280     s->unmap_feature.data = &s->unmap;
 281     s->features[0] = &s->map_feature;
 282     s->features[1] = &s->unmap_feature;
 283     s->features[2] = &buf_size_features[0];
 284     s->features[3] = &buf_size_features[1];
 285     s->features[4] = &buf_size_features[2];
 286
 287     if (ctx->nb_inputs) {
 288         AVFilterLink *inlink = ctx->inputs[0];
 289
 290         outlink->format      = inlink->format;
 291         outlink->sample_rate = sample_rate = inlink->sample_rate;
 292         if (s->nb_inputs == s->nb_outputs) {
 293             int ret;
 294             if ((ret = av_channel_layout_copy(&outlink->ch_layout, &inlink->ch_layout)) < 0)
 295                 return ret;
 296         }
 297
 298     } else {
 299         outlink->sample_rate = sample_rate = s->sample_rate;
 300         outlink->time_base   = (AVRational){1, s->sample_rate};
 301     }
 302
 303     s->instance = lilv_plugin_instantiate(s->plugin, sample_rate, s->features);
 304     if (!s->instance) {
 305         av_log(s, AV_LOG_ERROR, "Failed to instantiate <%s>\n", lilv_node_as_uri(lilv_plugin_get_uri(s->plugin)));
 306         return AVERROR(EINVAL);
 307     }
 308
 309     s->mins     = av_calloc(s->nb_ports, sizeof(float));
 310     s->maxes    = av_calloc(s->nb_ports, sizeof(float));
 311     s->controls = av_calloc(s->nb_ports, sizeof(float));
 312
 313     if (!s->mins || !s->maxes || !s->controls)
 314         return AVERROR(ENOMEM);
 315
 316     lilv_plugin_get_port_ranges_float(s->plugin, s->mins, s->maxes, s->controls);
 317     s->seq_out = av_malloc(sizeof(LV2_Atom_Sequence) + 9624);
 318     if (!s->seq_out)
 319         return AVERROR(ENOMEM);
 320
 321     if (s->options && !strcmp(s->options, "help")) {
 322         if (!s->nb_inputcontrols) {
 323             av_log(ctx, AV_LOG_INFO,
 324                    "The '%s' plugin does not have any input controls.\n",
 325                    s->plugin_uri);
 326         } else {
 327             av_log(ctx, AV_LOG_INFO,
 328                    "The '%s' plugin has the following input controls:\n",
 329                    s->plugin_uri);
 330             for (i = 0; i < s->nb_ports; i++) {
 331                 const LilvPort *port = lilv_plugin_get_port_by_index(s->plugin, i);
 332                 const LilvNode *symbol = lilv_port_get_symbol(s->plugin, port);
 333                 LilvNode *name = lilv_port_get_name(s->plugin, port);
 334
 335                 if (lilv_port_is_a(s->plugin, port, s->lv2_InputPort) &&
 336                     lilv_port_is_a(s->plugin, port, s->lv2_ControlPort)) {
 337                     av_log(ctx, AV_LOG_INFO, "%s\t\t<float> (from %f to %f) (default %f)\t\t%s\n",
 338                            lilv_node_as_string(symbol), s->mins[i], s->maxes[i], s->controls[i],
 339                            lilv_node_as_string(name));
 340                 }
 341
 342                 lilv_node_free(name);
 343             }
 344         }
 345         return AVERROR_EXIT;
 346     }
 347
 348     p = s->options;
 349     while (s->options) {
 350         const LilvPort *port;
 351         LilvNode *sym;
 352         float val;
 353         char *str, *vstr;
 354         int index;
 355
 356         if (!(arg = av_strtok(p, " |", &saveptr)))
 357             break;
 358         p = NULL;
 359
 360         vstr = strstr(arg, "=");
 361         if (vstr == NULL) {
 362             av_log(ctx, AV_LOG_ERROR, "Invalid syntax.\n");
 363             return AVERROR(EINVAL);
 364         }
 365
 366         vstr[0] = 0;
 367         str  = arg;
 368         val  = atof(vstr+1);
 369         sym  = lilv_new_string(s->world, str);
 370         port = lilv_plugin_get_port_by_symbol(s->plugin, sym);
 371         lilv_node_free(sym);
 372         if (!port) {
 373             av_log(s, AV_LOG_WARNING, "Unknown option: <%s>\n", str);
 374         } else {
 375             index = lilv_port_get_index(s->plugin, port);
 376             s->controls[index] = val;
 377         }
 378     }
 379
 380     if (s->nb_inputs &&
 381         (lilv_plugin_has_feature(s->plugin, s->powerOf2BlockLength) ||
 382          lilv_plugin_has_feature(s->plugin, s->fixedBlockLength) ||
 383          lilv_plugin_has_feature(s->plugin, s->boundedBlockLength))) {
 384         FilterLink *inlink = ff_filter_link(ctx->inputs[0]);
 385
 386         inlink->min_samples = inlink->max_samples = 4096;
 387     }
 388
 389     return 0;
 390 }
 391
 392 static av_cold int init(AVFilterContext *ctx)
 393 {
 394     LV2Context *s = ctx->priv;
 395     const LilvPlugins *plugins;
 396     const LilvPlugin *plugin;
 397     AVFilterPad pad = { NULL };
 398     LilvNode *uri;
 399     int i, ret;
 400
 401     s->world = lilv_world_new();
 402     if (!s->world)
 403         return AVERROR(ENOMEM);
 404
 405     uri = lilv_new_uri(s->world, s->plugin_uri);
 406     if (!uri) {
 407         av_log(s, AV_LOG_ERROR, "Invalid plugin URI <%s>\n", s->plugin_uri);
 408         return AVERROR(EINVAL);
 409     }
 410
 411     lilv_world_load_all(s->world);
 412     plugins = lilv_world_get_all_plugins(s->world);
 413     plugin  = lilv_plugins_get_by_uri(plugins, uri);
 414     lilv_node_free(uri);
 415
 416     if (!plugin) {
 417         av_log(s, AV_LOG_ERROR, "Plugin <%s> not found\n", s->plugin_uri);
 418         return AVERROR(EINVAL);
 419     }
 420
 421     s->plugin = plugin;
 422     s->nb_ports = lilv_plugin_get_num_ports(s->plugin);
 423
 424     s->lv2_InputPort       = lilv_new_uri(s->world, LV2_CORE__InputPort);
 425     s->lv2_OutputPort      = lilv_new_uri(s->world, LV2_CORE__OutputPort);
 426     s->lv2_AudioPort       = lilv_new_uri(s->world, LV2_CORE__AudioPort);
 427     s->lv2_ControlPort     = lilv_new_uri(s->world, LV2_CORE__ControlPort);
 428     s->lv2_Optional        = lilv_new_uri(s->world, LV2_CORE__connectionOptional);
 429     s->atom_AtomPort       = lilv_new_uri(s->world, LV2_ATOM__AtomPort);
 430     s->atom_Sequence       = lilv_new_uri(s->world, LV2_ATOM__Sequence);
 431     s->urid_map            = lilv_new_uri(s->world, LV2_URID__map);
 432     s->powerOf2BlockLength = lilv_new_uri(s->world, LV2_BUF_SIZE__powerOf2BlockLength);
 433     s->fixedBlockLength    = lilv_new_uri(s->world, LV2_BUF_SIZE__fixedBlockLength);
 434     s->boundedBlockLength  = lilv_new_uri(s->world, LV2_BUF_SIZE__boundedBlockLength);
 435
 436     for (i = 0; i < s->nb_ports; i++) {
 437         const LilvPort *lport = lilv_plugin_get_port_by_index(s->plugin, i);
 438         int is_input = 0;
 439         int is_optional = 0;
 440
 441         is_optional = lilv_port_has_property(s->plugin, lport, s->lv2_Optional);
 442
 443         if (lilv_port_is_a(s->plugin, lport, s->lv2_InputPort)) {
 444             is_input = 1;
 445         } else if (!lilv_port_is_a(s->plugin, lport, s->lv2_OutputPort) && !is_optional) {
 446             return AVERROR(EINVAL);
 447         }
 448
 449         if (lilv_port_is_a(s->plugin, lport, s->lv2_ControlPort)) {
 450             if (is_input) {
 451                 s->nb_inputcontrols++;
 452             }
 453         } else if (lilv_port_is_a(s->plugin, lport, s->lv2_AudioPort)) {
 454             if (is_input) {
 455                 s->nb_inputs++;
 456             } else {
 457                 s->nb_outputs++;
 458             }
 459         }
 460     }
 461
 462     pad.type = AVMEDIA_TYPE_AUDIO;
 463
 464     if (s->nb_inputs) {
 465         pad.name = av_asprintf("in0:%s:%u", s->plugin_uri, s->nb_inputs);
 466         if (!pad.name)
 467             return AVERROR(ENOMEM);
 468
 469         pad.filter_frame = filter_frame;
 470         if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
 471             return ret;
 472     }
 473
 474     return 0;
 475 }
 476
 477 static int query_formats(const AVFilterContext *ctx,
 478                          AVFilterFormatsConfig **cfg_in,
 479                          AVFilterFormatsConfig **cfg_out)
 480 {
 481     const LV2Context *s = ctx->priv;
 482     AVFilterChannelLayouts *layouts;
 483     static const enum AVSampleFormat sample_fmts[] = {
 484         AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
 485     int ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, sample_fmts);
 486     if (ret < 0)
 487         return ret;
 488
 489     if (!s->nb_inputs) {
 490         int sample_rates[] = { s->sample_rate, -1 };
 491
 492         ret = ff_set_common_samplerates_from_list2(ctx, cfg_in, cfg_out, sample_rates);
 493         if (ret < 0)
 494             return ret;
 495     }
 496
 497     if (s->nb_inputs == 2 && s->nb_outputs == 2) {
 498         layouts = NULL;
 499         ret = ff_add_channel_layout(&layouts, &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO);
 500         if (ret < 0)
 501             return ret;
 502         ret = ff_set_common_channel_layouts2(ctx, cfg_in, cfg_out, layouts);
 503         if (ret < 0)
 504             return ret;
 505     } else {
 506         if (s->nb_inputs >= 1) {
 507             AVChannelLayout inlayout = FF_COUNT2LAYOUT(s->nb_inputs);
 508
 509             layouts = NULL;
 510             ret = ff_add_channel_layout(&layouts, &inlayout);
 511             if (ret < 0)
 512                 return ret;
 513             ret = ff_channel_layouts_ref(layouts, &cfg_in[0]->channel_layouts);
 514             if (ret < 0)
 515                 return ret;
 516
 517             if (!s->nb_outputs) {
 518                 ret = ff_channel_layouts_ref(layouts, &cfg_out[0]->channel_layouts);
 519                 if (ret < 0)
 520                     return ret;
 521             }
 522         }
 523
 524         if (s->nb_outputs >= 1) {
 525             AVChannelLayout outlayout = FF_COUNT2LAYOUT(s->nb_outputs);
 526
 527             layouts = NULL;
 528             ret = ff_add_channel_layout(&layouts, &outlayout);
 529             if (ret < 0)
 530                 return ret;
 531             ret = ff_channel_layouts_ref(layouts, &cfg_out[0]->channel_layouts);
 532             if (ret < 0)
 533                 return ret;
 534         }
 535     }
 536
 537     return 0;
 538 }
 539
 540 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
 541                            char *res, int res_len, int flags)
 542 {
 543     LV2Context *s = ctx->priv;
 544     const LilvPort *port;
 545     LilvNode *sym;
 546     int index;
 547
 548     sym  = lilv_new_string(s->world, cmd);
 549     port = lilv_plugin_get_port_by_symbol(s->plugin, sym);
 550     lilv_node_free(sym);
 551     if (!port) {
 552         av_log(s, AV_LOG_WARNING, "Unknown option: <%s>\n", cmd);
 553     } else {
 554         index = lilv_port_get_index(s->plugin, port);
 555         s->controls[index] = atof(args);
 556     }
 557     return 0;
 558 }
 559
 560 static av_cold void uninit(AVFilterContext *ctx)
 561 {
 562     LV2Context *s = ctx->priv;
 563
 564     lilv_node_free(s->powerOf2BlockLength);
 565     lilv_node_free(s->fixedBlockLength);
 566     lilv_node_free(s->boundedBlockLength);
 567     lilv_node_free(s->urid_map);
 568     lilv_node_free(s->atom_Sequence);
 569     lilv_node_free(s->atom_AtomPort);
 570     lilv_node_free(s->lv2_Optional);
 571     lilv_node_free(s->lv2_ControlPort);
 572     lilv_node_free(s->lv2_AudioPort);
 573     lilv_node_free(s->lv2_OutputPort);
 574     lilv_node_free(s->lv2_InputPort);
 575     uri_table_destroy(&s->uri_table);
 576     lilv_instance_free(s->instance);
 577     lilv_world_free(s->world);
 578     av_freep(&s->mins);
 579     av_freep(&s->maxes);
 580     av_freep(&s->controls);
 581     av_freep(&s->seq_out);
 582 }
 583
 584 static const AVFilterPad lv2_outputs[] = {
 585     {
 586         .name          = "default",
 587         .type          = AVMEDIA_TYPE_AUDIO,
 588         .config_props  = config_output,
 589         .request_frame = request_frame,
 590     },
 591 };
 592
 593 const FFFilter ff_af_lv2 = {
 594     .p.name        = "lv2",
 595     .p.description = NULL_IF_CONFIG_SMALL("Apply LV2 effect."),
 596     .p.priv_class  = &lv2_class,
 597     .p.flags       = AVFILTER_FLAG_DYNAMIC_INPUTS,
 598     .priv_size     = sizeof(LV2Context),
 599     .init          = init,
 600     .uninit        = uninit,
 601     .process_command = process_command,
 602     FILTER_OUTPUTS(lv2_outputs),
 603     FILTER_QUERY_FUNC2(query_formats),
 604 };