2 Copyright (C) 2008-2010 Paul Davis
3 Author: David Robillard
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 #include "pbd/compose.h"
31 #include "pbd/error.h"
32 #include "pbd/pathscanner.h"
33 #include "pbd/xml++.h"
35 #include "ardour/ardour.h"
36 #include "ardour/session.h"
37 #include "ardour/audioengine.h"
38 #include "ardour/audio_buffer.h"
39 #include "ardour/lv2_event_buffer.h"
40 #include "ardour/lv2_plugin.h"
42 #include "pbd/stl_delete.h"
47 #include "lv2ext/lv2_persist.h"
48 #include "lv2_pfile.h"
51 using namespace ARDOUR;
54 URIMap LV2Plugin::_uri_map;
55 uint32_t LV2Plugin::_midi_event_type = _uri_map.uri_to_id(
56 "http://lv2plug.in/ns/ext/event",
57 "http://lv2plug.in/ns/ext/midi#MidiEvent");
59 LV2Plugin::LV2Plugin (AudioEngine& e, Session& session, LV2World& world, SLV2Plugin plugin, framecnt_t rate)
64 init (world, plugin, rate);
67 LV2Plugin::LV2Plugin (const LV2Plugin &other)
69 , _world(other._world)
72 init (other._world, other._plugin, other._sample_rate);
74 for (uint32_t i = 0; i < parameter_count(); ++i) {
75 _control_data[i] = other._shadow_data[i];
76 _shadow_data[i] = other._shadow_data[i];
81 LV2Plugin::init (LV2World& world, SLV2Plugin plugin, framecnt_t rate)
88 _latency_control_port = 0;
89 _was_activated = false;
91 _instance_access_feature.URI = "http://lv2plug.in/ns/ext/instance-access";
92 _data_access_feature.URI = "http://lv2plug.in/ns/ext/data-access";
93 _persist_feature.URI = "http://lv2plug.in/ns/ext/persist";
94 _persist_feature.data = NULL;
96 SLV2Value persist_uri = slv2_value_new_uri(_world.world, _persist_feature.URI);
97 _supports_persist = slv2_plugin_has_feature(plugin, persist_uri);
98 slv2_value_free(persist_uri);
100 _features = (LV2_Feature**)malloc(sizeof(LV2_Feature*) * 5);
101 _features[0] = &_instance_access_feature;
102 _features[1] = &_data_access_feature;
103 _features[2] = &_persist_feature;
104 _features[3] = _uri_map.feature();
107 _instance = slv2_plugin_instantiate(plugin, rate, _features);
108 _name = slv2_plugin_get_name(plugin);
109 _author = slv2_plugin_get_author_name(plugin);
111 if (_instance == 0) {
112 error << _("LV2: Failed to instantiate plugin ") << slv2_plugin_get_uri(plugin) << endl;
113 throw failed_constructor();
116 _instance_access_feature.data = (void*)_instance->lv2_handle;
117 _data_access_extension_data.extension_data = _instance->lv2_descriptor->extension_data;
118 _data_access_feature.data = &_data_access_extension_data;
120 if (slv2_plugin_has_feature(plugin, world.in_place_broken)) {
121 error << string_compose(
122 _("LV2: \"%1\" cannot be used, since it cannot do inplace processing"),
123 slv2_value_as_string(_name));
124 slv2_value_free(_name);
125 slv2_value_free(_author);
126 throw failed_constructor();
131 const bool latent = slv2_plugin_has_latency(plugin);
132 uint32_t latency_port = (latent ? slv2_plugin_get_latency_port_index(plugin) : 0);
133 const uint32_t num_ports = slv2_plugin_get_num_ports(plugin);
135 _control_data = new float[num_ports];
136 _shadow_data = new float[num_ports];
137 _defaults = new float[num_ports];
139 for (uint32_t i = 0; i < num_ports; ++i) {
140 SLV2Port port = slv2_plugin_get_port_by_index(plugin, i);
141 SLV2Value sym = slv2_port_get_symbol(_plugin, port);
142 _port_indices.insert(std::make_pair(slv2_value_as_string(sym), i));
143 if (parameter_is_control(i)) {
145 slv2_port_get_range(plugin, port, &def, NULL, NULL);
146 _defaults[i] = def ? slv2_value_as_float(def) : 0.0f;
147 slv2_value_free(def);
149 slv2_instance_connect_port (_instance, i, &_control_data[i]);
151 if (latent && i == latency_port) {
152 _latency_control_port = &_control_data[i];
153 *_latency_control_port = 0;
156 if (parameter_is_input(i)) {
157 _shadow_data[i] = default_value (i);
164 SLV2UIs uis = slv2_plugin_get_uis(_plugin);
165 if (slv2_uis_size(uis) > 0) {
166 for (unsigned i=0; i < slv2_uis_size(uis); ++i) {
167 SLV2UI ui = slv2_uis_get_at(uis, i);
168 if (slv2_ui_is_a(ui, _world.gtk_gui)) {
174 // if gtk gui is not available, try to find external gui
176 for (unsigned i=0; i < slv2_uis_size(uis); ++i) {
177 SLV2UI ui = slv2_uis_get_at(uis, i);
178 if (slv2_ui_is_a(ui, _world.external_gui)) {
186 latency_compute_run ();
189 LV2Plugin::~LV2Plugin ()
194 slv2_instance_free(_instance);
195 slv2_value_free(_name);
196 slv2_value_free(_author);
198 delete [] _control_data;
199 delete [] _shadow_data;
203 LV2Plugin::is_external_ui() const
205 return slv2_ui_is_a(_ui, _world.external_gui);
209 LV2Plugin::unique_id() const
211 return slv2_value_as_uri(slv2_plugin_get_uri(_plugin));
216 LV2Plugin::default_value (uint32_t port)
218 return _defaults[port];
222 LV2Plugin::port_symbol (uint32_t index) const
224 SLV2Port port = slv2_plugin_get_port_by_index(_plugin, index);
226 error << name() << ": Invalid port index " << index << endmsg;
229 SLV2Value sym = slv2_port_get_symbol(_plugin, port);
230 return slv2_value_as_string(sym);
235 LV2Plugin::set_parameter (uint32_t which, float val)
237 if (which < slv2_plugin_get_num_ports(_plugin)) {
238 _shadow_data[which] = val;
241 if (which < parameter_count() && controls[which]) {
242 controls[which]->Changed ();
247 warning << string_compose (_("Illegal parameter number used with plugin \"%1\"."
248 "This is a bug in either %2 or the LV2 plugin (%3)"),
249 name(), PROGRAM_NAME, unique_id()) << endmsg;
252 Plugin::set_parameter (which, val);
256 LV2Plugin::get_parameter (uint32_t which) const
258 if (parameter_is_input(which)) {
259 return (float) _shadow_data[which];
261 return (float) _control_data[which];
267 LV2Plugin::nth_parameter (uint32_t n, bool& ok) const
273 for (c = 0, x = 0; x < slv2_plugin_get_num_ports(_plugin); ++x) {
274 if (parameter_is_control (x)) {
286 LV2Plugin::lv2_persist_store_callback(void* callback_data,
292 LV2PFile file = (LV2PFile)callback_data;
294 // FIXME: assumes URIs are mapped in the default context (or not event, at least)
295 const char* type_uri = LV2Plugin::_uri_map.id_to_uri(NULL, type);
296 cout << "LV2 PERSIST STORE " << key << " = " << value << " :: " << type_uri << endl;
297 lv2_pfile_write(file, key, value, size, type_uri);
301 LV2Plugin::lv2_persist_retrieve_callback(void* callback_data,
306 //LV2PFile file = (LV2PFile)callback_data;
307 cout << "LV2 PERSIST RETRIEVE " << key << endl;
312 LV2Plugin::add_state (XMLNode* root) const
316 LocaleGuard lg (X_("POSIX"));
318 for (uint32_t i = 0; i < parameter_count(); ++i){
320 if (parameter_is_input(i) && parameter_is_control(i)) {
321 child = new XMLNode("Port");
322 /*snprintf(buf, sizeof(buf), "%u", i);
323 child->add_property("number", string(buf));*/
324 child->add_property("symbol", port_symbol(i));
325 snprintf(buf, sizeof(buf), "%+f", _shadow_data[i]);
326 child->add_property("value", string(buf));
327 root->add_child_nocopy (*child);
329 /*if (i < controls.size() && controls[i]) {
330 root->add_child_nocopy (controls[i]->get_state());
335 if (_supports_persist) {
336 // Create state directory for this plugin instance
337 const std::string state_filename = _id.to_s() + ".lv2pfile";
338 const std::string state_path = Glib::build_filename(
339 _session.plugins_dir(), state_filename);
341 cout << "Saving LV2 plugin state to " << state_path << endl;
343 // Get LV2 Persist extension data from plugin instance
344 LV2_Persist* persist = (LV2_Persist*)slv2_instance_get_extension_data(
345 _instance, "http://lv2plug.in/ns/ext/persist");
347 warning << string_compose(
348 _("Plugin \"%1\% failed to return LV2 persist data"),
353 LV2PFile file = lv2_pfile_open(state_path.c_str(), true);
354 persist->save(_instance->lv2_handle, &LV2Plugin::lv2_persist_store_callback, file);
355 lv2_pfile_close(file);
357 root->add_property("state-file", state_filename);
362 LV2Plugin::find_presets ()
364 SLV2Results presets = slv2_plugin_query_sparql(_plugin,
365 "PREFIX lv2p: <http://lv2plug.in/ns/dev/presets#>\n"
366 "PREFIX dc: <http://dublincore.org/documents/dcmi-namespace/>\n"
367 "SELECT ?p ?name WHERE { <> lv2p:hasPreset ?p . ?p dc:title ?name }\n");
369 for (; !slv2_results_finished(presets); slv2_results_next(presets)) {
370 SLV2Value uri = slv2_results_get_binding_value(presets, 0);
371 SLV2Value name = slv2_results_get_binding_value(presets, 1);
372 PresetRecord rec(slv2_value_as_string(uri), slv2_value_as_string(name));
373 _presets.insert(std::make_pair(slv2_value_as_string(uri), rec));
376 slv2_results_free(presets);
380 LV2Plugin::load_preset (PresetRecord r)
382 Plugin::load_preset (r);
384 const string query = string(
385 "PREFIX lv2p: <http://lv2plug.in/ns/dev/presets#>\n"
386 "PREFIX dc: <http://dublincore.org/documents/dcmi-namespace/>\n"
387 "SELECT ?sym ?val WHERE { <") + r.uri + "> lv2:port ?port . "
388 " ?port lv2:symbol ?sym ; lv2p:value ?val . }";
389 SLV2Results values = slv2_plugin_query_sparql(_plugin, query.c_str());
390 for (; !slv2_results_finished(values); slv2_results_next(values)) {
391 SLV2Value sym = slv2_results_get_binding_value(values, 0);
392 SLV2Value val = slv2_results_get_binding_value(values, 1);
393 if (slv2_value_is_float(val)) {
394 uint32_t index = _port_indices[slv2_value_as_string(sym)];
395 set_parameter(index, slv2_value_as_float(val));
398 slv2_results_free(values);
403 LV2Plugin::do_save_preset (string /*name*/)
409 LV2Plugin::do_remove_preset (string /*name*/)
415 LV2Plugin::has_editor() const
417 return (_ui != NULL);
421 LV2Plugin::set_state(const XMLNode& node, int version)
424 const XMLProperty* prop;
425 XMLNodeConstIterator iter;
430 LocaleGuard lg(X_("POSIX"));
432 if (node.name() != state_node_name()) {
433 error << _("Bad node sent to LV2Plugin::set_state") << endmsg;
438 nodes = node.children ("port");
440 nodes = node.children ("Port");
443 for (iter = nodes.begin(); iter != nodes.end(); ++iter){
447 if ((prop = child->property("symbol")) != 0) {
448 sym = prop->value().c_str();
450 warning << _("LV2: port has no symbol, ignored") << endmsg;
454 map<string,uint32_t>::iterator i = _port_indices.find(sym);
456 if (i != _port_indices.end()) {
459 warning << _("LV2: port has unknown index, ignored") << endmsg;
463 if ((prop = child->property("value")) != 0) {
464 value = prop->value().c_str();
466 warning << _("LV2: port has no value, ignored") << endmsg;
470 set_parameter (port_id, atof(value));
473 if ((prop = node.property("state-file")) != 0) {
474 std::string state_path = Glib::build_filename(_session.plugins_dir(), prop->value());
476 // Get LV2 Persist extension data from plugin instance
477 LV2_Persist* persist = (LV2_Persist*)slv2_instance_get_extension_data(
478 _instance, "http://lv2plug.in/ns/ext/persist");
480 cout << "Loading LV2 state from " << state_path << endl;
481 LV2PFile file = lv2_pfile_open(state_path.c_str(), false);
482 persist->restore(_instance->lv2_handle, &LV2Plugin::lv2_persist_retrieve_callback, file);
483 lv2_pfile_close(file);
485 warning << string_compose(
486 _("Plugin \"%1\% failed to return LV2 persist data"),
491 latency_compute_run ();
493 return Plugin::set_state (node, version);
497 LV2Plugin::get_parameter_descriptor (uint32_t which, ParameterDescriptor& desc) const
499 SLV2Port port = slv2_plugin_get_port_by_index(_plugin, which);
501 SLV2Value def, min, max;
502 slv2_port_get_range(_plugin, port, &def, &min, &max);
504 desc.integer_step = slv2_port_has_property(_plugin, port, _world.integer);
505 desc.toggled = slv2_port_has_property(_plugin, port, _world.toggled);
506 desc.logarithmic = slv2_port_has_property(_plugin, port, _world.logarithmic);
507 desc.sr_dependent = slv2_port_has_property(_plugin, port, _world.srate);
508 desc.label = slv2_value_as_string(slv2_port_get_name(_plugin, port));
509 desc.lower = min ? slv2_value_as_float(min) : 0.0f;
510 desc.upper = max ? slv2_value_as_float(max) : 1.0f;
511 desc.min_unbound = false; // TODO: LV2 extension required
512 desc.max_unbound = false; // TODO: LV2 extension required
514 if (desc.integer_step) {
516 desc.smallstep = 0.1;
517 desc.largestep = 10.0;
519 const float delta = desc.upper - desc.lower;
520 desc.step = delta / 1000.0f;
521 desc.smallstep = delta / 10000.0f;
522 desc.largestep = delta/10.0f;
525 slv2_value_free(def);
526 slv2_value_free(min);
527 slv2_value_free(max);
534 LV2Plugin::describe_parameter (Evoral::Parameter which)
536 if (which.type() == PluginAutomation && which.id() < parameter_count()) {
537 SLV2Value name = slv2_port_get_name(_plugin,
538 slv2_plugin_get_port_by_index(_plugin, which.id()));
539 string ret(slv2_value_as_string(name));
540 slv2_value_free(name);
548 LV2Plugin::signal_latency () const
550 if (_latency_control_port) {
551 return (framecnt_t) floor (*_latency_control_port);
557 set<Evoral::Parameter>
558 LV2Plugin::automatable () const
560 set<Evoral::Parameter> ret;
562 for (uint32_t i = 0; i < parameter_count(); ++i){
563 if (parameter_is_input(i) && parameter_is_control(i)) {
564 ret.insert (ret.end(), Evoral::Parameter(PluginAutomation, 0, i));
572 LV2Plugin::connect_and_run (BufferSet& bufs,
573 ChanMapping in_map, ChanMapping out_map,
574 pframes_t nframes, framecnt_t offset)
576 Plugin::connect_and_run (bufs, in_map, out_map, nframes, offset);
578 cycles_t then = get_cycles ();
580 uint32_t audio_in_index = 0;
581 uint32_t audio_out_index = 0;
582 uint32_t midi_in_index = 0;
583 uint32_t midi_out_index = 0;
584 for (uint32_t port_index = 0; port_index < parameter_count(); ++port_index) {
585 if (parameter_is_audio(port_index)) {
586 if (parameter_is_input(port_index)) {
587 const uint32_t buf_index = in_map.get(DataType::AUDIO, audio_in_index++);
588 //cerr << port_index << " : " << " AUDIO IN " << buf_index << endl;
589 slv2_instance_connect_port(_instance, port_index,
590 bufs.get_audio(buf_index).data(offset));
591 } else if (parameter_is_output(port_index)) {
592 const uint32_t buf_index = out_map.get(DataType::AUDIO, audio_out_index++);
593 //cerr << port_index << " : " << " AUDIO OUT " << buf_index << endl;
594 slv2_instance_connect_port(_instance, port_index,
595 bufs.get_audio(buf_index).data(offset));
597 } else if (parameter_is_midi(port_index)) {
598 if (parameter_is_input(port_index)) {
599 const uint32_t buf_index = in_map.get(DataType::MIDI, midi_in_index++);
600 //cerr << port_index << " : " << " MIDI IN " << buf_index << endl;
601 slv2_instance_connect_port(_instance, port_index,
602 bufs.get_lv2_midi(true, buf_index).data());
603 } else if (parameter_is_output(port_index)) {
604 const uint32_t buf_index = out_map.get(DataType::MIDI, midi_out_index++);
605 //cerr << port_index << " : " << " MIDI OUT " << buf_index << endl;
606 slv2_instance_connect_port(_instance, port_index,
607 bufs.get_lv2_midi(false, buf_index).data());
609 } else if (!parameter_is_control(port_index)) {
610 // Optional port (it'd better be if we've made it this far...)
611 slv2_instance_connect_port(_instance, port_index, NULL);
618 for (uint32_t port_index = 0; port_index < parameter_count(); ++port_index) {
619 if (parameter_is_midi(port_index) && parameter_is_output(port_index)) {
620 const uint32_t buf_index = out_map.get(DataType::MIDI, midi_out_index++);
621 bufs.flush_lv2_midi(true, buf_index);
625 cycles_t now = get_cycles ();
626 set_cycles ((uint32_t) (now - then));
632 LV2Plugin::parameter_is_control (uint32_t param) const
634 SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
635 return slv2_port_is_a(_plugin, port, _world.control_class);
639 LV2Plugin::parameter_is_audio (uint32_t param) const
641 SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
642 return slv2_port_is_a(_plugin, port, _world.audio_class);
646 LV2Plugin::parameter_is_midi (uint32_t param) const
648 SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
649 return slv2_port_is_a(_plugin, port, _world.event_class);
650 // && slv2_port_supports_event(_plugin, port, _world.midi_class);
654 LV2Plugin::parameter_is_output (uint32_t param) const
656 SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
657 return slv2_port_is_a(_plugin, port, _world.output_class);
661 LV2Plugin::parameter_is_input (uint32_t param) const
663 SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
664 return slv2_port_is_a(_plugin, port, _world.input_class);
668 LV2Plugin::print_parameter (uint32_t param, char *buf, uint32_t len) const
671 if (param < parameter_count()) {
672 snprintf (buf, len, "%.3f", get_parameter (param));
680 LV2Plugin::run (pframes_t nframes)
682 for (uint32_t i = 0; i < parameter_count(); ++i) {
683 if (parameter_is_control(i) && parameter_is_input(i)) {
684 _control_data[i] = _shadow_data[i];
688 slv2_instance_run(_instance, nframes);
692 LV2Plugin::latency_compute_run ()
694 if (!_latency_control_port) {
698 /* we need to run the plugin so that it can set its latency
704 uint32_t port_index = 0;
705 uint32_t in_index = 0;
706 uint32_t out_index = 0;
708 const framecnt_t bufsize = 1024;
709 float buffer[bufsize];
711 memset(buffer, 0, sizeof(float) * bufsize);
713 // FIXME: Ensure plugins can handle in-place processing
717 while (port_index < parameter_count()) {
718 if (parameter_is_audio (port_index)) {
719 if (parameter_is_input (port_index)) {
720 slv2_instance_connect_port (_instance, port_index, buffer);
722 } else if (parameter_is_output (port_index)) {
723 slv2_instance_connect_port (_instance, port_index, buffer);
735 : world(slv2_world_new())
737 slv2_world_load_all(world);
738 input_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_INPUT);
739 output_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_OUTPUT);
740 control_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_CONTROL);
741 audio_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_AUDIO);
742 event_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_EVENT);
743 midi_class = slv2_value_new_uri(world, SLV2_EVENT_CLASS_MIDI);
744 in_place_broken = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "inPlaceBroken");
745 integer = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "integer");
746 toggled = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "toggled");
747 srate = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "sampleRate");
748 gtk_gui = slv2_value_new_uri(world, "http://lv2plug.in/ns/extensions/ui#GtkUI");
749 external_gui = slv2_value_new_uri(world, "http://lv2plug.in/ns/extensions/ui#external");
750 logarithmic = slv2_value_new_uri(world, "http://lv2plug.in/ns/dev/extportinfo#logarithmic");
753 LV2World::~LV2World()
755 slv2_value_free(input_class);
756 slv2_value_free(output_class);
757 slv2_value_free(control_class);
758 slv2_value_free(audio_class);
759 slv2_value_free(event_class);
760 slv2_value_free(midi_class);
761 slv2_value_free(in_place_broken);
764 LV2PluginInfo::LV2PluginInfo (void* lv2_world, void* slv2_plugin)
765 : _lv2_world(lv2_world)
766 , _slv2_plugin(slv2_plugin)
771 LV2PluginInfo::~LV2PluginInfo()
776 LV2PluginInfo::load (Session& session)
781 plugin.reset (new LV2Plugin (session.engine(), session,
782 *(LV2World*)_lv2_world, (SLV2Plugin)_slv2_plugin, session.frame_rate()));
784 plugin->set_info(PluginInfoPtr(new LV2PluginInfo(*this)));
788 catch (failed_constructor &err) {
789 return PluginPtr ((Plugin*) 0);
796 LV2PluginInfo::discover (void* lv2_world)
798 PluginInfoList* plugs = new PluginInfoList;
799 LV2World* world = (LV2World*)lv2_world;
800 SLV2Plugins plugins = slv2_world_get_all_plugins(world->world);
802 cerr << "LV2: Discovering " << slv2_plugins_size (plugins) << " plugins" << endl;
804 for (unsigned i=0; i < slv2_plugins_size(plugins); ++i) {
805 SLV2Plugin p = slv2_plugins_get_at(plugins, i);
806 LV2PluginInfoPtr info (new LV2PluginInfo(lv2_world, p));
808 SLV2Value name = slv2_plugin_get_name(p);
811 cerr << "LV2: invalid plugin\n";
817 info->name = string(slv2_value_as_string(name));
818 slv2_value_free(name);
820 SLV2PluginClass pclass = slv2_plugin_get_class(p);
821 SLV2Value label = slv2_plugin_class_get_label(pclass);
822 info->category = slv2_value_as_string(label);
824 SLV2Value author_name = slv2_plugin_get_author_name(p);
825 info->creator = author_name ? string(slv2_value_as_string(author_name)) : "Unknown";
826 slv2_value_free(author_name);
828 info->path = "/NOPATH"; // Meaningless for LV2
830 info->n_inputs.set_audio(slv2_plugin_get_num_ports_of_class(p,
831 world->input_class, world->audio_class, NULL));
832 info->n_inputs.set_midi(slv2_plugin_get_num_ports_of_class(p,
833 world->input_class, world->event_class, NULL));
835 info->n_outputs.set_audio(slv2_plugin_get_num_ports_of_class(p,
836 world->output_class, world->audio_class, NULL));
837 info->n_outputs.set_midi(slv2_plugin_get_num_ports_of_class(p,
838 world->output_class, world->event_class, NULL));
840 info->unique_id = slv2_value_as_uri(slv2_plugin_get_uri(p));
841 info->index = 0; // Meaningless for LV2
843 plugs->push_back (info);
846 cerr << "Done LV2 discovery" << endl;