libs/ardour/lv2_plugin.cc

   1 /*
   2     Copyright (C) 2008 Paul Davis
   3     Author: Dave Robillard
   4
   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.
   9
  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.
  14
  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.
  18
  19 */
  20
  21 #include <vector>
  22 #include <string>
  23
  24 #include <cstdlib>
  25 #include <cmath>
  26 #include <cstring>
  27
  28 #include "pbd/compose.h"
  29 #include "pbd/error.h"
  30 #include "pbd/pathscanner.h"
  31 #include "pbd/xml++.h"
  32
  33 #include "ardour/ardour.h"
  34 #include "ardour/session.h"
  35 #include "ardour/audioengine.h"
  36 #include "ardour/audio_buffer.h"
  37 #include "ardour/lv2_event_buffer.h"
  38 #include "ardour/lv2_plugin.h"
  39
  40 #include "pbd/stl_delete.h"
  41
  42 #include "i18n.h"
  43 #include <locale.h>
  44
  45 using namespace std;
  46 using namespace ARDOUR;
  47 using namespace PBD;
  48
  49 URIMap   LV2Plugin::_uri_map;
  50 uint32_t LV2Plugin::_midi_event_type = _uri_map.uri_to_id(
  51                 "http://lv2plug.in/ns/ext/event",
  52                 "http://lv2plug.in/ns/ext/midi#MidiEvent");
  53
  54 LV2Plugin::LV2Plugin (AudioEngine& e, Session& session, LV2World& world, SLV2Plugin plugin, nframes_t rate)
  55         : Plugin (e, session)
  56         , _world(world)
  57         , _features(NULL)
  58 {
  59         init (world, plugin, rate);
  60 }
  61
  62 LV2Plugin::LV2Plugin (const LV2Plugin &other)
  63         : Plugin (other)
  64         , _world(other._world)
  65         , _features(NULL)
  66 {
  67         init (other._world, other._plugin, other._sample_rate);
  68
  69         for (uint32_t i = 0; i < parameter_count(); ++i) {
  70                 _control_data[i] = other._shadow_data[i];
  71                 _shadow_data[i] = other._shadow_data[i];
  72         }
  73 }
  74
  75 void
  76 LV2Plugin::init (LV2World& world, SLV2Plugin plugin, nframes_t rate)
  77 {
  78         _world = world;
  79         _plugin = plugin;
  80         _ui = NULL;
  81         _control_data = 0;
  82         _shadow_data = 0;
  83         _latency_control_port = 0;
  84         _was_activated = false;
  85
  86         _instance = slv2_plugin_instantiate(plugin, rate, _features);
  87         _name = slv2_plugin_get_name(plugin);
  88         assert(_name);
  89         _author = slv2_plugin_get_author_name(plugin);
  90
  91         if (_instance == 0) {
  92                 error << _("LV2: Failed to instantiate plugin ") << slv2_plugin_get_uri(plugin) << endl;
  93                 throw failed_constructor();
  94         }
  95
  96         if (slv2_plugin_has_feature(plugin, world.in_place_broken)) {
  97                 error << string_compose(
  98                                 _("LV2: \"%1\" cannot be used, since it cannot do inplace processing"),
  99                                 slv2_value_as_string(_name));
 100                 slv2_value_free(_name);
 101                 slv2_value_free(_author);
 102                 throw failed_constructor();
 103         }
 104
 105         _instance_access_feature.URI = "http://lv2plug.in/ns/ext/instance-access";
 106         _instance_access_feature.data = (void*)_instance->lv2_handle;
 107
 108         _data_access_extension_data.extension_data = _instance->lv2_descriptor->extension_data;
 109         _data_access_feature.URI = "http://lv2plug.in/ns/ext/data-access";
 110         _data_access_feature.data = &_data_access_extension_data;
 111
 112         _features = (LV2_Feature**)malloc(sizeof(LV2_Feature*) * 4);
 113         _features[0] = &_instance_access_feature;
 114         _features[1] = &_data_access_feature;
 115         _features[2] = _uri_map.feature();
 116         _features[3] = NULL;
 117
 118         _sample_rate = rate;
 119
 120         const uint32_t num_ports = slv2_plugin_get_num_ports(plugin);
 121
 122         _control_data = new float[num_ports];
 123         _shadow_data = new float[num_ports];
 124         _defaults = new float[num_ports];
 125
 126         const bool latent = slv2_plugin_has_latency(plugin);
 127         uint32_t latency_port = (latent ? slv2_plugin_get_latency_port_index(plugin) : 0);
 128
 129         for (uint32_t i = 0; i < num_ports; ++i) {
 130                 SLV2Port port = slv2_plugin_get_port_by_index(plugin, i);
 131                 SLV2Value sym = slv2_port_get_symbol(_plugin, port);
 132                 _port_indices.insert(std::make_pair(slv2_value_as_string(sym), i));
 133                 if (parameter_is_control(i)) {
 134                         SLV2Value def;
 135                         slv2_port_get_range(plugin, port, &def, NULL, NULL);
 136                         _defaults[i] = def ? slv2_value_as_float(def) : 0.0f;
 137                         slv2_value_free(def);
 138
 139                         slv2_instance_connect_port (_instance, i, &_control_data[i]);
 140
 141                         if (latent && i == latency_port) {
 142                                 _latency_control_port = &_control_data[i];
 143                                 *_latency_control_port = 0;
 144                         }
 145
 146                         if (parameter_is_input(i)) {
 147                                 _shadow_data[i] = default_value (i);
 148                         }
 149                 } else {
 150                         _defaults[i] = 0.0f;
 151                 }
 152         }
 153
 154         SLV2UIs uis = slv2_plugin_get_uis(_plugin);
 155         if (slv2_uis_size(uis) > 0) {
 156                 for (unsigned i=0; i < slv2_uis_size(uis); ++i) {
 157                         SLV2UI ui = slv2_uis_get_at(uis, i);
 158                         if (slv2_ui_is_a(ui, _world.gtk_gui)) {
 159                                 _ui = ui;
 160                                 break;
 161                         }
 162                 }
 163
 164                 // if gtk gui is not available, try to find external gui
 165                 if (!_ui) {
 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.external_gui)) {
 169                                         _ui = ui;
 170                                         break;
 171                                 }
 172                         }
 173                 }
 174         }
 175
 176         latency_compute_run ();
 177 }
 178
 179 LV2Plugin::~LV2Plugin ()
 180 {
 181         deactivate ();
 182         cleanup ();
 183
 184         slv2_instance_free(_instance);
 185         slv2_value_free(_name);
 186         slv2_value_free(_author);
 187
 188         delete [] _control_data;
 189         delete [] _shadow_data;
 190 }
 191
 192 bool
 193 LV2Plugin::is_external_ui() const
 194 {
 195         return slv2_ui_is_a(_ui, _world.external_gui);
 196 }
 197
 198 string
 199 LV2Plugin::unique_id() const
 200 {
 201         return slv2_value_as_uri(slv2_plugin_get_uri(_plugin));
 202 }
 203
 204
 205 float
 206 LV2Plugin::default_value (uint32_t port)
 207 {
 208         return _defaults[port];
 209 }
 210
 211 const char*
 212 LV2Plugin::port_symbol (uint32_t index)
 213 {
 214         SLV2Port port = slv2_plugin_get_port_by_index(_plugin, index);
 215         if (!port) {
 216                 error << name() << ": Invalid port index " << index << endmsg;
 217         }
 218
 219         SLV2Value sym = slv2_port_get_symbol(_plugin, port);
 220         return slv2_value_as_string(sym);
 221 }
 222
 223
 224 void
 225 LV2Plugin::set_parameter (uint32_t which, float val)
 226 {
 227         if (which < slv2_plugin_get_num_ports(_plugin)) {
 228                 _shadow_data[which] = val;
 229 #if 0
 230                 ParameterChanged (which, val); /* EMIT SIGNAL */
 231
 232                 if (which < parameter_count() && controls[which]) {
 233                         controls[which]->Changed ();
 234                 }
 235 #endif
 236
 237         } else {
 238                 warning << string_compose (_("Illegal parameter number used with plugin \"%1\"."
 239                                 "This is a bug in either Ardour or the LV2 plugin (%2)"),
 240                                 name(), unique_id()) << endmsg;
 241         }
 242 }
 243
 244 float
 245 LV2Plugin::get_parameter (uint32_t which) const
 246 {
 247         if (parameter_is_input(which)) {
 248                 return (float) _shadow_data[which];
 249         } else {
 250                 return (float) _control_data[which];
 251         }
 252         return 0.0f;
 253 }
 254
 255 uint32_t
 256 LV2Plugin::nth_parameter (uint32_t n, bool& ok) const
 257 {
 258         uint32_t x, c;
 259
 260         ok = false;
 261
 262         for (c = 0, x = 0; x < slv2_plugin_get_num_ports(_plugin); ++x) {
 263                 if (parameter_is_control (x)) {
 264                         if (c++ == n) {
 265                                 ok = true;
 266                                 return x;
 267                         }
 268                 }
 269         }
 270
 271         return 0;
 272 }
 273
 274 XMLNode&
 275 LV2Plugin::get_state()
 276 {
 277         XMLNode *root = new XMLNode(state_node_name());
 278         XMLNode *child;
 279         char buf[16];
 280         LocaleGuard lg (X_("POSIX"));
 281
 282         for (uint32_t i = 0; i < parameter_count(); ++i){
 283
 284                 if (parameter_is_input(i) && parameter_is_control(i)) {
 285                         child = new XMLNode("Port");
 286                         /*snprintf(buf, sizeof(buf), "%u", i);
 287                         child->add_property("number", string(buf));*/
 288                         child->add_property("symbol", port_symbol(i));
 289                         snprintf(buf, sizeof(buf), "%+f", _shadow_data[i]);
 290                         child->add_property("value", string(buf));
 291                         root->add_child_nocopy (*child);
 292
 293                         /*if (i < controls.size() && controls[i]) {
 294                                 root->add_child_nocopy (controls[i]->get_state());
 295                         }*/
 296                 }
 297         }
 298
 299         return *root;
 300 }
 301
 302 vector<Plugin::PresetRecord>
 303 LV2Plugin::get_presets()
 304 {
 305         vector<PresetRecord> result;
 306         SLV2Results presets = slv2_plugin_query_sparql(_plugin,
 307                         "PREFIX lv2p: <http://lv2plug.in/ns/dev/presets#>\n"
 308                         "PREFIX dc:  <http://dublincore.org/documents/dcmi-namespace/>\n"
 309                         "SELECT ?p ?name WHERE { <> lv2p:hasPreset ?p . ?p dc:title ?name }\n");
 310         for (; !slv2_results_finished(presets); slv2_results_next(presets)) {
 311                 SLV2Value uri  = slv2_results_get_binding_value(presets, 0);
 312                 SLV2Value name = slv2_results_get_binding_value(presets, 1);
 313                 PresetRecord rec(slv2_value_as_string(uri), slv2_value_as_string(name));
 314                 result.push_back(rec);
 315                 this->presets.insert(std::make_pair(slv2_value_as_string(uri), rec));
 316         }
 317         slv2_results_free(presets);
 318         return result;
 319 }
 320
 321 bool
 322 LV2Plugin::load_preset(const string uri)
 323 {
 324         const string query = string(
 325                         "PREFIX lv2p: <http://lv2plug.in/ns/dev/presets#>\n"
 326                         "PREFIX dc:  <http://dublincore.org/documents/dcmi-namespace/>\n"
 327                         "SELECT ?sym ?val WHERE { <") + uri + "> lv2:port ?port . "
 328                                 " ?port lv2:symbol ?sym ; lv2p:value ?val . }";
 329         SLV2Results values = slv2_plugin_query_sparql(_plugin, query.c_str());
 330         for (; !slv2_results_finished(values); slv2_results_next(values)) {
 331                 SLV2Value sym  = slv2_results_get_binding_value(values, 0);
 332                 SLV2Value val = slv2_results_get_binding_value(values, 1);
 333                 if (slv2_value_is_float(val)) {
 334                         uint32_t index = _port_indices[slv2_value_as_string(sym)];
 335                         set_parameter(index, slv2_value_as_float(val));
 336                 }
 337         }
 338         slv2_results_free(values);
 339         return true;
 340 }
 341
 342 bool
 343 LV2Plugin::save_preset (string /*name*/)
 344 {
 345         return false;
 346 }
 347
 348 bool
 349 LV2Plugin::has_editor() const
 350 {
 351         return (_ui != NULL);
 352 }
 353
 354 int
 355 LV2Plugin::set_state(const XMLNode& node, int /*version*/)
 356 {
 357         XMLNodeList nodes;
 358         XMLProperty *prop;
 359         XMLNodeConstIterator iter;
 360         XMLNode *child;
 361         const char *sym;
 362         const char *value;
 363         uint32_t port_id;
 364         LocaleGuard lg (X_("POSIX"));
 365
 366         if (node.name() != state_node_name()) {
 367                 error << _("Bad node sent to LV2Plugin::set_state") << endmsg;
 368                 return -1;
 369         }
 370
 371         nodes = node.children ("Port");
 372
 373         for (iter = nodes.begin(); iter != nodes.end(); ++iter){
 374
 375                 child = *iter;
 376
 377                 if ((prop = child->property("symbol")) != 0) {
 378                         sym = prop->value().c_str();
 379                 } else {
 380                         warning << _("LV2: port has no symbol, ignored") << endmsg;
 381                         continue;
 382                 }
 383
 384                 map<string,uint32_t>::iterator i = _port_indices.find(sym);
 385                 if (i != _port_indices.end()) {
 386                         port_id = i->second;
 387                 } else {
 388                         warning << _("LV2: port has unknown index, ignored") << endmsg;
 389                         continue;
 390                 }
 391
 392                 if ((prop = child->property("value")) != 0) {
 393                         value = prop->value().c_str();
 394                 } else {
 395                         warning << _("LV2: port has no value, ignored") << endmsg;
 396                         continue;
 397                 }
 398
 399                 set_parameter (port_id, atof(value));
 400         }
 401
 402         latency_compute_run ();
 403
 404         return 0;
 405 }
 406
 407 int
 408 LV2Plugin::get_parameter_descriptor (uint32_t which, ParameterDescriptor& desc) const
 409 {
 410         SLV2Port port = slv2_plugin_get_port_by_index(_plugin, which);
 411
 412         SLV2Value def, min, max;
 413         slv2_port_get_range(_plugin, port, &def, &min, &max);
 414
 415     desc.integer_step = slv2_port_has_property(_plugin, port, _world.integer);
 416     desc.toggled = slv2_port_has_property(_plugin, port, _world.toggled);
 417     desc.logarithmic = slv2_port_has_property(_plugin, port, _world.logarithmic);
 418     desc.sr_dependent = slv2_port_has_property(_plugin, port, _world.srate);
 419     desc.label = slv2_value_as_string(slv2_port_get_name(_plugin, port));
 420     desc.lower = min ? slv2_value_as_float(min) : 0.0f;
 421     desc.upper = max ? slv2_value_as_float(max) : 1.0f;
 422     desc.min_unbound = false; // TODO (LV2 extension)
 423     desc.max_unbound = false; // TODO (LV2 extension)
 424
 425         if (desc.integer_step) {
 426                 desc.step = 1.0;
 427                 desc.smallstep = 0.1;
 428                 desc.largestep = 10.0;
 429         } else {
 430                 const float delta = desc.upper - desc.lower;
 431                 desc.step = delta / 1000.0f;
 432                 desc.smallstep = delta / 10000.0f;
 433                 desc.largestep = delta/10.0f;
 434         }
 435
 436         slv2_value_free(def);
 437         slv2_value_free(min);
 438         slv2_value_free(max);
 439
 440         return 0;
 441 }
 442
 443
 444 string
 445 LV2Plugin::describe_parameter (Evoral::Parameter which)
 446 {
 447         if (which.type() == PluginAutomation && which.id() < parameter_count()) {
 448                 SLV2Value name = slv2_port_get_name(_plugin,
 449                         slv2_plugin_get_port_by_index(_plugin, which));
 450                 string ret(slv2_value_as_string(name));
 451                 slv2_value_free(name);
 452                 return ret;
 453         } else {
 454                 return "??";
 455         }
 456 }
 457
 458 nframes_t
 459 LV2Plugin::signal_latency () const
 460 {
 461         if (_latency_control_port) {
 462                 return (nframes_t) floor (*_latency_control_port);
 463         } else {
 464                 return 0;
 465         }
 466 }
 467
 468 set<Evoral::Parameter>
 469 LV2Plugin::automatable () const
 470 {
 471         set<Evoral::Parameter> ret;
 472
 473         for (uint32_t i = 0; i < parameter_count(); ++i){
 474                 if (parameter_is_input(i) && parameter_is_control(i)) {
 475                         ret.insert (ret.end(), Evoral::Parameter(PluginAutomation, 0, i));
 476                 }
 477         }
 478
 479         return ret;
 480 }
 481
 482 int
 483 LV2Plugin::connect_and_run (BufferSet& bufs,
 484                 ChanMapping in_map, ChanMapping out_map,
 485                 nframes_t nframes, nframes_t offset)
 486 {
 487         cycles_t then = get_cycles ();
 488
 489         uint32_t audio_in_index  = 0;
 490         uint32_t audio_out_index = 0;
 491         uint32_t midi_in_index   = 0;
 492         uint32_t midi_out_index  = 0;
 493         for (uint32_t port_index = 0; port_index < parameter_count(); ++port_index) {
 494                 if (parameter_is_audio(port_index)) {
 495                         if (parameter_is_input(port_index)) {
 496                                 const uint32_t buf_index = in_map.get(DataType::AUDIO, audio_in_index++);
 497                                 //cerr << port_index << " : " << " AUDIO IN " << buf_index << endl;
 498                                 slv2_instance_connect_port(_instance, port_index,
 499                                                 bufs.get_audio(buf_index).data(offset));
 500                         } else if (parameter_is_output(port_index)) {
 501                                 const uint32_t buf_index = out_map.get(DataType::AUDIO, audio_out_index++);
 502                                 //cerr << port_index << " : " << " AUDIO OUT " << buf_index << endl;
 503                                 slv2_instance_connect_port(_instance, port_index,
 504                                                 bufs.get_audio(buf_index).data(offset));
 505                         }
 506                 } else if (parameter_is_midi(port_index)) {
 507                         if (parameter_is_input(port_index)) {
 508                                 const uint32_t buf_index = in_map.get(DataType::MIDI, midi_in_index++);
 509                                 //cerr << port_index << " : " << " MIDI IN " << buf_index << endl;
 510                                 slv2_instance_connect_port(_instance, port_index,
 511                                                 bufs.get_lv2_midi(true, buf_index).data());
 512                         } else if (parameter_is_output(port_index)) {
 513                                 const uint32_t buf_index = out_map.get(DataType::MIDI, midi_out_index++);
 514                                 //cerr << port_index << " : " << " MIDI OUT " << buf_index << endl;
 515                                 slv2_instance_connect_port(_instance, port_index,
 516                                                 bufs.get_lv2_midi(false, buf_index).data());
 517                         }
 518                 } else if (!parameter_is_control(port_index)) {
 519                         // Optional port (it'd better be if we've made it this far...)
 520                         slv2_instance_connect_port(_instance, port_index, NULL);
 521                 }
 522         }
 523
 524         run (nframes);
 525
 526         midi_out_index = 0;
 527         for (uint32_t port_index = 0; port_index < parameter_count(); ++port_index) {
 528                 if (parameter_is_midi(port_index) && parameter_is_output(port_index)) {
 529                         const uint32_t buf_index = out_map.get(DataType::MIDI, midi_out_index++);
 530                         bufs.flush_lv2_midi(true, buf_index);
 531                 }
 532         }
 533
 534         cycles_t now = get_cycles ();
 535         set_cycles ((uint32_t) (now - then));
 536
 537         return 0;
 538 }
 539
 540 bool
 541 LV2Plugin::parameter_is_control (uint32_t param) const
 542 {
 543         SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
 544         return slv2_port_is_a(_plugin, port, _world.control_class);
 545 }
 546
 547 bool
 548 LV2Plugin::parameter_is_audio (uint32_t param) const
 549 {
 550         SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
 551         return slv2_port_is_a(_plugin, port, _world.audio_class);
 552 }
 553
 554 bool
 555 LV2Plugin::parameter_is_midi (uint32_t param) const
 556 {
 557         SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
 558         return slv2_port_is_a(_plugin, port, _world.event_class);
 559         //      && slv2_port_supports_event(_plugin, port, _world.midi_class);
 560 }
 561
 562 bool
 563 LV2Plugin::parameter_is_output (uint32_t param) const
 564 {
 565         SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
 566         return slv2_port_is_a(_plugin, port, _world.output_class);
 567 }
 568
 569 bool
 570 LV2Plugin::parameter_is_input (uint32_t param) const
 571 {
 572         SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
 573         return slv2_port_is_a(_plugin, port, _world.input_class);
 574 }
 575
 576 void
 577 LV2Plugin::print_parameter (uint32_t param, char *buf, uint32_t len) const
 578 {
 579         if (buf && len) {
 580                 if (param < parameter_count()) {
 581                         snprintf (buf, len, "%.3f", get_parameter (param));
 582                 } else {
 583                         strcat (buf, "0");
 584                 }
 585         }
 586 }
 587
 588 void
 589 LV2Plugin::run (nframes_t nframes)
 590 {
 591         for (uint32_t i = 0; i < parameter_count(); ++i) {
 592                 if (parameter_is_control(i) && parameter_is_input(i))  {
 593                         _control_data[i] = _shadow_data[i];
 594                 }
 595         }
 596
 597         slv2_instance_run(_instance, nframes);
 598 }
 599
 600 void
 601 LV2Plugin::latency_compute_run ()
 602 {
 603         if (!_latency_control_port) {
 604                 return;
 605         }
 606
 607         /* we need to run the plugin so that it can set its latency
 608            parameter.
 609         */
 610
 611         activate ();
 612
 613         uint32_t port_index = 0;
 614         uint32_t in_index = 0;
 615         uint32_t out_index = 0;
 616         const nframes_t bufsize = 1024;
 617         float buffer[bufsize];
 618
 619         memset(buffer,0,sizeof(float)*bufsize);
 620
 621         /* Note that we've already required that plugins
 622            be able to handle in-place processing.
 623         */
 624
 625         port_index = 0;
 626
 627         while (port_index < parameter_count()) {
 628                 if (parameter_is_audio (port_index)) {
 629                         if (parameter_is_input (port_index)) {
 630                                 slv2_instance_connect_port (_instance, port_index, buffer);
 631                                 in_index++;
 632                         } else if (parameter_is_output (port_index)) {
 633                                 slv2_instance_connect_port (_instance, port_index, buffer);
 634                                 out_index++;
 635                         }
 636                 }
 637                 port_index++;
 638         }
 639
 640         run (bufsize);
 641         deactivate ();
 642 }
 643
 644 LV2World::LV2World()
 645         : world(slv2_world_new())
 646 {
 647         slv2_world_load_all(world);
 648         input_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_INPUT);
 649         output_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_OUTPUT);
 650         control_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_CONTROL);
 651         audio_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_AUDIO);
 652         event_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_EVENT);
 653         midi_class = slv2_value_new_uri(world, SLV2_EVENT_CLASS_MIDI);
 654         in_place_broken = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "inPlaceBroken");
 655         integer = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "integer");
 656         toggled = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "toggled");
 657         srate = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "sampleRate");
 658         gtk_gui = slv2_value_new_uri(world, "http://lv2plug.in/ns/extensions/ui#GtkUI");
 659         external_gui = slv2_value_new_uri(world, "http://lv2plug.in/ns/extensions/ui#external");
 660         logarithmic = slv2_value_new_uri(world, "http://lv2plug.in/ns/dev/extportinfo#logarithmic");
 661 }
 662
 663 LV2World::~LV2World()
 664 {
 665         slv2_value_free(input_class);
 666         slv2_value_free(output_class);
 667         slv2_value_free(control_class);
 668         slv2_value_free(audio_class);
 669         slv2_value_free(event_class);
 670         slv2_value_free(midi_class);
 671         slv2_value_free(in_place_broken);
 672 }
 673
 674 LV2PluginInfo::LV2PluginInfo (void* lv2_world, void* slv2_plugin)
 675         : _lv2_world(lv2_world)
 676         , _slv2_plugin(slv2_plugin)
 677 {
 678 }
 679
 680 LV2PluginInfo::~LV2PluginInfo()
 681 {
 682 }
 683
 684 PluginPtr
 685 LV2PluginInfo::load (Session& session)
 686 {
 687         try {
 688                 PluginPtr plugin;
 689
 690                 plugin.reset (new LV2Plugin (session.engine(), session,
 691                                 *(LV2World*)_lv2_world, (SLV2Plugin)_slv2_plugin, session.frame_rate()));
 692
 693                 plugin->set_info(PluginInfoPtr(new LV2PluginInfo(*this)));
 694                 return plugin;
 695         }
 696
 697         catch (failed_constructor &err) {
 698                 return PluginPtr ((Plugin*) 0);
 699         }
 700
 701         return PluginPtr();
 702 }
 703
 704 PluginInfoList*
 705 LV2PluginInfo::discover (void* lv2_world)
 706 {
 707         PluginInfoList* plugs = new PluginInfoList;
 708
 709         LV2World* world = (LV2World*)lv2_world;
 710         SLV2Plugins plugins = slv2_world_get_all_plugins(world->world);
 711
 712         cerr << "LV2: Discovering " << slv2_plugins_size (plugins) << " plugins" << endl;
 713
 714         for (unsigned i=0; i < slv2_plugins_size(plugins); ++i) {
 715                 SLV2Plugin p = slv2_plugins_get_at(plugins, i);
 716                 LV2PluginInfoPtr info (new LV2PluginInfo(lv2_world, p));
 717
 718                 SLV2Value name = slv2_plugin_get_name(p);
 719
 720                 if (!name) {
 721                         cerr << "LV2: invalid plugin\n";
 722                         continue;
 723                 }
 724
 725                 info->type = LV2;
 726
 727                 info->name = string(slv2_value_as_string(name));
 728                 slv2_value_free(name);
 729
 730                 SLV2PluginClass pclass = slv2_plugin_get_class(p);
 731                 SLV2Value label = slv2_plugin_class_get_label(pclass);
 732                 info->category = slv2_value_as_string(label);
 733
 734                 SLV2Value author_name = slv2_plugin_get_author_name(p);
 735                 info->creator = author_name ? string(slv2_value_as_string(author_name)) : "Unknown";
 736                 slv2_value_free(author_name);
 737
 738                 info->path = "/NOPATH"; // Meaningless for LV2
 739
 740                 info->n_inputs.set_audio(slv2_plugin_get_num_ports_of_class(p,
 741                                 world->input_class, world->audio_class, NULL));
 742                 info->n_inputs.set_midi(slv2_plugin_get_num_ports_of_class(p,
 743                                 world->input_class, world->event_class, NULL));
 744
 745                 info->n_outputs.set_audio(slv2_plugin_get_num_ports_of_class(p,
 746                                 world->output_class, world->audio_class, NULL));
 747                 info->n_outputs.set_midi(slv2_plugin_get_num_ports_of_class(p,
 748                                 world->output_class, world->event_class, NULL));
 749
 750                 info->unique_id = slv2_value_as_uri(slv2_plugin_get_uri(p));
 751                 info->index = 0; // Meaningless for LV2
 752
 753                 plugs->push_back (info);
 754         }
 755
 756         cerr << "Done LV2 discovery" << endl;
 757
 758         return plugs;
 759 }
 760