libs/ardour/lv2_plugin.cc

   1 /*
   2     Copyright (C) 2008-2011 Paul Davis
   3     Author: David 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 <string>
  22 #include <vector>
  23
  24 #include <cmath>
  25 #include <cstdlib>
  26 #include <cstring>
  27
  28 #include <glibmm.h>
  29 #include <giomm/file.h>
  30
  31 #include <boost/utility.hpp>
  32
  33 #include "pbd/compose.h"
  34 #include "pbd/error.h"
  35 #include "pbd/pathscanner.h"
  36 #include "pbd/stl_delete.h"
  37 #include "pbd/xml++.h"
  38
  39 #include "libardour-config.h"
  40
  41 #include "ardour/ardour.h"
  42 #include "ardour/audio_buffer.h"
  43 #include "ardour/audioengine.h"
  44 #include "ardour/debug.h"
  45 #include "ardour/lv2_event_buffer.h"
  46 #include "ardour/lv2_plugin.h"
  47 #include "ardour/lv2_state.h"
  48 #include "ardour/session.h"
  49
  50 #include "i18n.h"
  51 #include <locale.h>
  52
  53 #include <lilv/lilv.h>
  54
  55 #include "lv2/lv2plug.in/ns/ext/state/state.h"
  56 #include "rdff.h"
  57 #ifdef HAVE_SUIL
  58 #include <suil/suil.h>
  59 #endif
  60
  61 #define NS_DC      "http://dublincore.org/documents/dcmi-namespace/"
  62 #define NS_LV2     "http://lv2plug.in/ns/lv2core#"
  63 #define NS_OLDPSET "http://lv2plug.in/ns/dev/presets#"
  64 #define NS_PSET    "http://lv2plug.in/ns/ext/presets#"
  65 #define NS_UI      "http://lv2plug.in/ns/extensions/ui#"
  66 #define NS_RDFS    "http://www.w3.org/2000/01/rdf-schema#"
  67
  68 using namespace std;
  69 using namespace ARDOUR;
  70 using namespace PBD;
  71
  72 URIMap LV2Plugin::_uri_map;
  73 uint32_t LV2Plugin::_midi_event_type = _uri_map.uri_to_id(
  74         "http://lv2plug.in/ns/ext/event",
  75         "http://lv2plug.in/ns/ext/midi#MidiEvent");
  76 uint32_t LV2Plugin::_state_path_type = _uri_map.uri_to_id(
  77         NULL, LV2_STATE_PATH_URI);
  78
  79 class LV2World : boost::noncopyable {
  80 public:
  81         LV2World ();
  82         ~LV2World ();
  83
  84         LilvWorld* world;
  85         LilvNode*  input_class;      ///< Input port
  86         LilvNode*  output_class;     ///< Output port
  87         LilvNode*  audio_class;      ///< Audio port
  88         LilvNode*  control_class;    ///< Control port
  89         LilvNode*  event_class;      ///< Event port
  90         LilvNode*  midi_class;       ///< MIDI event
  91         LilvNode*  in_place_broken;
  92         LilvNode*  integer;
  93         LilvNode*  toggled;
  94         LilvNode*  srate;
  95         LilvNode*  gtk_gui;
  96         LilvNode*  external_gui;
  97         LilvNode*  logarithmic;
  98 };
  99
 100 static LV2World _world;
 101
 102 struct LV2Plugin::Impl {
 103         Impl() : plugin(0), ui(0), ui_type(0), name(0), author(0), instance(0) {}
 104         LilvPlugin*     plugin;
 105         const LilvUI*   ui;
 106         const LilvNode* ui_type;
 107         LilvNode*       name;
 108         LilvNode*       author;
 109         LilvInstance*   instance;
 110 };
 111
 112 LV2Plugin::LV2Plugin (AudioEngine& engine,
 113                       Session&     session,
 114                       void*        c_plugin,
 115                       framecnt_t   rate)
 116         : Plugin(engine, session)
 117         , _impl(new Impl())
 118         , _features(NULL)
 119         , _insert_id("0")
 120 {
 121         init(c_plugin, rate);
 122 }
 123
 124 LV2Plugin::LV2Plugin (const LV2Plugin& other)
 125         : Plugin(other)
 126         , _impl(new Impl())
 127         , _features(NULL)
 128         , _insert_id(other._insert_id)
 129 {
 130         init(other._impl->plugin, other._sample_rate);
 131
 132         for (uint32_t i = 0; i < parameter_count(); ++i) {
 133                 _control_data[i] = other._shadow_data[i];
 134                 _shadow_data[i]  = other._shadow_data[i];
 135         }
 136 }
 137
 138 void
 139 LV2Plugin::init(void* c_plugin, framecnt_t rate)
 140 {
 141         DEBUG_TRACE(DEBUG::LV2, "init\n");
 142
 143         _impl->plugin         = (LilvPlugin*)c_plugin;
 144         _impl->ui             = NULL;
 145         _impl->ui_type        = NULL;
 146         _control_data         = 0;
 147         _shadow_data          = 0;
 148         _latency_control_port = 0;
 149         _was_activated        = false;
 150
 151         _instance_access_feature.URI = "http://lv2plug.in/ns/ext/instance-access";
 152         _data_access_feature.URI     = "http://lv2plug.in/ns/ext/data-access";
 153         _map_path_feature.URI        = LV2_STATE_MAP_PATH_URI;
 154         _make_path_feature.URI       = LV2_STATE_MAKE_PATH_URI;
 155
 156         LilvPlugin* plugin = _impl->plugin;
 157
 158         LilvNode* state_iface_uri = lilv_new_uri(_world.world, LV2_STATE_INTERFACE_URI);
 159 #ifdef lilv_plugin_has_extension_data
 160         _has_state_interface = lilv_plugin_has_extension_data(plugin, state_iface_uri);
 161         lilv_node_free(state_iface_uri);
 162 #else
 163         LilvNode* lv2_extensionData = lilv_new_uri(_world.world, NS_LV2 "extensionData");
 164         LilvNodes* extdatas = lilv_plugin_get_value(plugin, lv2_extensionData);
 165         LILV_FOREACH(nodes, i, extdatas) {
 166                 if (lilv_node_equals(lilv_nodes_get(extdatas, i), state_iface_uri)) {
 167                         _has_state_interface = true;
 168                         break;
 169                 }
 170         }
 171 #endif
 172
 173         _features    = (LV2_Feature**)malloc(sizeof(LV2_Feature*) * 8);
 174         _features[0] = &_instance_access_feature;
 175         _features[1] = &_data_access_feature;
 176         _features[2] = &_map_path_feature;
 177         _features[3] = &_make_path_feature;
 178         _features[4] = _uri_map.uri_map_feature();
 179         _features[5] = _uri_map.urid_map_feature();
 180         _features[6] = _uri_map.urid_unmap_feature();
 181         _features[7] = NULL;
 182
 183         LV2_State_Map_Path* map_path = (LV2_State_Map_Path*)malloc(
 184                 sizeof(LV2_State_Map_Path));
 185         map_path->handle = this;
 186         map_path->abstract_path = &lv2_state_abstract_path;
 187         map_path->absolute_path = &lv2_state_absolute_path;
 188         _map_path_feature.data = map_path;
 189
 190         LV2_State_Make_Path* make_path = (LV2_State_Make_Path*)malloc(
 191                 sizeof(LV2_State_Make_Path));
 192         make_path->handle = this;
 193         make_path->path = &lv2_state_make_path;
 194         _make_path_feature.data = make_path;
 195
 196         _impl->instance = lilv_plugin_instantiate(plugin, rate, _features);
 197         _impl->name     = lilv_plugin_get_name(plugin);
 198         _impl->author   = lilv_plugin_get_author_name(plugin);
 199
 200         if (_impl->instance == 0) {
 201                 error << _("LV2: Failed to instantiate plugin ") << uri() << endmsg;
 202                 throw failed_constructor();
 203         }
 204
 205         _instance_access_feature.data              = (void*)_impl->instance->lv2_handle;
 206         _data_access_extension_data.extension_data = _impl->instance->lv2_descriptor->extension_data;
 207         _data_access_feature.data                  = &_data_access_extension_data;
 208
 209         if (lilv_plugin_has_feature(plugin, _world.in_place_broken)) {
 210                 error << string_compose(
 211                     _("LV2: \"%1\" cannot be used, since it cannot do inplace processing"),
 212                     lilv_node_as_string(_impl->name)) << endmsg;
 213                 lilv_node_free(_impl->name);
 214                 lilv_node_free(_impl->author);
 215                 throw failed_constructor();
 216         }
 217
 218         _sample_rate = rate;
 219
 220         const uint32_t num_ports    = this->num_ports();
 221
 222         for (uint32_t i = 0; i < num_ports; ++i) {
 223                 const LilvPort* port = lilv_plugin_get_port_by_index(_impl->plugin, i);
 224                 _port_is_control.push_back(lilv_port_is_a(_impl->plugin, port, _world.control_class));
 225                 _port_is_audio.push_back(lilv_port_is_a(_impl->plugin, port, _world.audio_class));
 226                 _port_is_midi.push_back(lilv_port_is_a(_impl->plugin, port, _world.event_class));
 227                 _port_is_output.push_back(lilv_port_is_a(_impl->plugin, port, _world.output_class));
 228                 _port_is_input.push_back(lilv_port_is_a(_impl->plugin, port, _world.input_class));
 229         }
 230
 231         const bool     latent       = lilv_plugin_has_latency(plugin);
 232         const uint32_t latency_port = (latent)
 233             ? lilv_plugin_get_latency_port_index(plugin)
 234                 : 0;
 235
 236         _control_data = new float[num_ports];
 237         _shadow_data  = new float[num_ports];
 238         _defaults     = new float[num_ports];
 239
 240         for (uint32_t i = 0; i < num_ports; ++i) {
 241                 const LilvPort* port = lilv_plugin_get_port_by_index(plugin, i);
 242                 const LilvNode* sym  = lilv_port_get_symbol(plugin, port);
 243
 244                 // Store index in map so we can look up index by symbol
 245                 _port_indices.insert(std::make_pair(lilv_node_as_string(sym), i));
 246
 247                 // Get range and default value if applicable
 248                 if (parameter_is_control(i)) {
 249                         LilvNode* def;
 250                         lilv_port_get_range(plugin, port, &def, NULL, NULL);
 251                         _defaults[i] = def ? lilv_node_as_float(def) : 0.0f;
 252                         if (lilv_port_has_property (plugin, port, _world.srate)) {
 253                                 _defaults[i] *= _session.frame_rate ();
 254                         }
 255                         lilv_node_free(def);
 256
 257                         lilv_instance_connect_port(_impl->instance, i, &_control_data[i]);
 258
 259                         if (latent && ( i == latency_port) ) {
 260                                 _latency_control_port  = &_control_data[i];
 261                                 *_latency_control_port = 0;
 262                         }
 263
 264                         if (parameter_is_input(i)) {
 265                                 _shadow_data[i] = default_value(i);
 266                         }
 267                 } else {
 268                         _defaults[i] = 0.0f;
 269                 }
 270         }
 271
 272         LilvUIs* uis = lilv_plugin_get_uis(plugin);
 273         if (lilv_uis_size(uis) > 0) {
 274 #ifdef HAVE_SUIL
 275                 // Look for embeddable UI
 276                 LILV_FOREACH(uis, u, uis) {
 277                         const LilvUI*   this_ui      = lilv_uis_get(uis, u);
 278                         const LilvNode* this_ui_type = NULL;
 279                         if (lilv_ui_is_supported(this_ui,
 280                                                  suil_ui_supported,
 281                                                  _world.gtk_gui,
 282                                                  &this_ui_type)) {
 283                                 // TODO: Multiple UI support
 284                                 _impl->ui      = this_ui;
 285                                 _impl->ui_type = this_ui_type;
 286                                 break;
 287                         }
 288                 }
 289 #else
 290                 // Look for Gtk native UI
 291                 LILV_FOREACH(uis, i, uis) {
 292                         const LilvUI* ui = lilv_uis_get(uis, i);
 293                         if (lilv_ui_is_a(ui, _world.gtk_gui)) {
 294                                 _impl->ui      = ui;
 295                                 _impl->ui_type = _world.gtk_gui;
 296                                 break;
 297                         }
 298                 }
 299 #endif
 300
 301                 // If Gtk UI is not available, try to find external UI
 302                 if (!_impl->ui) {
 303                         LILV_FOREACH(uis, i, uis) {
 304                                 const LilvUI* ui = lilv_uis_get(uis, i);
 305                                 if (lilv_ui_is_a(ui, _world.external_gui)) {
 306                                         _impl->ui      = ui;
 307                                         _impl->ui_type = _world.external_gui;
 308                                         break;
 309                                 }
 310                         }
 311                 }
 312         }
 313
 314         latency_compute_run();
 315 }
 316
 317 LV2Plugin::~LV2Plugin ()
 318 {
 319         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 destroy\n", name()));
 320
 321         deactivate();
 322         cleanup();
 323
 324         lilv_instance_free(_impl->instance);
 325         lilv_node_free(_impl->name);
 326         lilv_node_free(_impl->author);
 327
 328         delete [] _control_data;
 329         delete [] _shadow_data;
 330 }
 331
 332 bool
 333 LV2Plugin::is_external_ui() const
 334 {
 335         if (!_impl->ui) {
 336                 return false;
 337         }
 338         return lilv_ui_is_a(_impl->ui, _world.external_gui);
 339 }
 340
 341 string
 342 LV2Plugin::unique_id() const
 343 {
 344         return lilv_node_as_uri(lilv_plugin_get_uri(_impl->plugin));
 345 }
 346
 347 const char*
 348 LV2Plugin::uri() const
 349 {
 350         return lilv_node_as_uri(lilv_plugin_get_uri(_impl->plugin));
 351 }
 352
 353 const char*
 354 LV2Plugin::label() const
 355 {
 356         return lilv_node_as_string(_impl->name);
 357 }
 358
 359 const char*
 360 LV2Plugin::name() const
 361 {
 362         return lilv_node_as_string(_impl->name);
 363 }
 364
 365 const char*
 366 LV2Plugin::maker() const
 367 {
 368         return _impl->author ? lilv_node_as_string (_impl->author) : "Unknown";
 369 }
 370
 371 uint32_t
 372 LV2Plugin::num_ports() const
 373 {
 374         return lilv_plugin_get_num_ports(_impl->plugin);
 375 }
 376
 377 uint32_t
 378 LV2Plugin::parameter_count() const
 379 {
 380         return lilv_plugin_get_num_ports(_impl->plugin);
 381 }
 382
 383 float
 384 LV2Plugin::default_value(uint32_t port)
 385 {
 386         return _defaults[port];
 387 }
 388
 389 const char*
 390 LV2Plugin::port_symbol(uint32_t index) const
 391 {
 392         const LilvPort* port = lilv_plugin_get_port_by_index(_impl->plugin, index);
 393         if (!port) {
 394                 error << name() << ": Invalid port index " << index << endmsg;
 395         }
 396
 397         const LilvNode* sym = lilv_port_get_symbol(_impl->plugin, port);
 398         return lilv_node_as_string(sym);
 399 }
 400
 401 void
 402 LV2Plugin::set_parameter(uint32_t which, float val)
 403 {
 404         DEBUG_TRACE(DEBUG::LV2, string_compose(
 405                             "%1 set parameter %2 to %3\n", name(), which, val));
 406
 407         if (which < lilv_plugin_get_num_ports(_impl->plugin)) {
 408                 _shadow_data[which] = val;
 409         } else {
 410                 warning << string_compose(
 411                     _("Illegal parameter number used with plugin \"%1\". "
 412                       "This is a bug in either %2 or the LV2 plugin <%3>"),
 413                     name(), PROGRAM_NAME, unique_id()) << endmsg;
 414         }
 415
 416         Plugin::set_parameter(which, val);
 417 }
 418
 419 float
 420 LV2Plugin::get_parameter(uint32_t which) const
 421 {
 422         if (parameter_is_input(which)) {
 423                 return (float)_shadow_data[which];
 424         } else {
 425                 return (float)_control_data[which];
 426         }
 427         return 0.0f;
 428 }
 429
 430 uint32_t
 431 LV2Plugin::nth_parameter(uint32_t n, bool& ok) const
 432 {
 433         ok = false;
 434         for (uint32_t c = 0, x = 0; x < lilv_plugin_get_num_ports(_impl->plugin); ++x) {
 435                 if (parameter_is_control(x)) {
 436                         if (c++ == n) {
 437                                 ok = true;
 438                                 return x;
 439                         }
 440                 }
 441         }
 442
 443         return 0;
 444 }
 445
 446 const void*
 447 LV2Plugin::extension_data (const char* uri) const
 448 {
 449         return lilv_instance_get_extension_data(_impl->instance, uri);
 450 }
 451
 452 void*
 453 LV2Plugin::c_plugin ()
 454 {
 455         return _impl->plugin;
 456 }
 457
 458 void*
 459 LV2Plugin::c_ui ()
 460 {
 461         return (void*)_impl->ui;
 462 }
 463
 464 void*
 465 LV2Plugin::c_ui_type ()
 466 {
 467         return (void*)_impl->ui_type;
 468 }
 469
 470 const std::string
 471 LV2Plugin::state_dir() const
 472 {
 473         return Glib::build_filename(_session.plugins_dir(),
 474                                     _insert_id.to_s());
 475 }
 476
 477 int
 478 LV2Plugin::lv2_state_store_callback(LV2_State_Handle handle,
 479                                     uint32_t         key,
 480                                     const void*      value,
 481                                     size_t           size,
 482                                     uint32_t         type,
 483                                     uint32_t         flags)
 484 {
 485         DEBUG_TRACE(DEBUG::LV2, string_compose(
 486                             "state store %1 (size: %2, type: %3, flags: %4)\n",
 487                             _uri_map.id_to_uri(NULL, key),
 488                             size,
 489                             _uri_map.id_to_uri(NULL, type),
 490                             flags));
 491
 492         LV2State* state = (LV2State*)handle;
 493         state->add_uri(key,  _uri_map.id_to_uri(NULL, key));
 494         state->add_uri(type, _uri_map.id_to_uri(NULL, type));
 495
 496         if (type == _state_path_type) {
 497                 const LV2Plugin&    me = state->plugin;
 498                 LV2_State_Map_Path* mp = (LV2_State_Map_Path*)me._map_path_feature.data;
 499                 return state->add_value(
 500                         key,
 501                         lv2_state_abstract_path(mp->handle, (const char*)value),
 502                         size, type, flags);
 503         } else if ((flags & LV2_STATE_IS_POD) && (flags & LV2_STATE_IS_PORTABLE)) {
 504                 return state->add_value(key, value, size, type, flags);
 505         } else {
 506                 PBD::warning << "LV2 plugin attempted to store non-portable property." << endl;
 507                 return -1;
 508         }
 509 }
 510
 511 const void*
 512 LV2Plugin::lv2_state_retrieve_callback(LV2_State_Handle host_data,
 513                                        uint32_t         key,
 514                                        size_t*          size,
 515                                        uint32_t*        type,
 516                                        uint32_t*        flags)
 517 {
 518         LV2State* state = (LV2State*)host_data;
 519         LV2State::Values::const_iterator i = state->values.find(key);
 520         if (i == state->values.end()) {
 521                 warning << "LV2 plugin attempted to retrieve nonexistent key: "
 522                         << _uri_map.id_to_uri(NULL, key) << endmsg;
 523                 return NULL;
 524         }
 525         *size  = i->second.size;
 526         *type  = i->second.type;
 527         *flags = LV2_STATE_IS_POD | LV2_STATE_IS_PORTABLE;
 528         DEBUG_TRACE(DEBUG::LV2, string_compose(
 529                             "state retrieve %1 = %2 (size: %3, type: %4)\n",
 530                             _uri_map.id_to_uri(NULL, key),
 531                             i->second.value, *size, *type));
 532         if (*type == _state_path_type) {
 533                 const LV2Plugin&    me = state->plugin;
 534                 LV2_State_Map_Path* mp = (LV2_State_Map_Path*)me._map_path_feature.data;
 535                 return lv2_state_absolute_path(mp->handle, (const char*)i->second.value);
 536         } else {
 537                 return i->second.value;
 538         }
 539 }
 540
 541 char*
 542 LV2Plugin::lv2_state_abstract_path(LV2_State_Map_Path_Handle handle,
 543                                    const char*               absolute_path)
 544 {
 545         LV2Plugin* me = (LV2Plugin*)handle;
 546         if (me->_insert_id == PBD::ID("0")) {
 547                 return g_strdup(absolute_path);
 548         }
 549
 550         const std::string state_dir = me->state_dir();
 551
 552         char* ret = NULL;
 553         if (strncmp(absolute_path, state_dir.c_str(), state_dir.length())) {
 554                 // Path outside state directory, make symbolic link
 555                 const std::string       name = Glib::path_get_basename(absolute_path);
 556                 const std::string       path = Glib::build_filename(state_dir, name);
 557                 Gio::File::create_for_path(path)->make_symbolic_link(absolute_path);
 558                 ret = g_strndup(path.c_str(), path.length());
 559         } else {
 560                 // Path inside the state directory, return relative path
 561                 const std::string path(absolute_path + state_dir.length() + 1);
 562                 ret = g_strndup(path.c_str(), path.length());
 563         }
 564
 565         DEBUG_TRACE(DEBUG::LV2, string_compose("abstract path %1 => %2\n",
 566                                                absolute_path, ret));
 567
 568         return ret;
 569 }
 570
 571 char*
 572 LV2Plugin::lv2_state_absolute_path(LV2_State_Map_Path_Handle handle,
 573                                    const char*               abstract_path)
 574 {
 575         LV2Plugin* me = (LV2Plugin*)handle;
 576         if (me->_insert_id == PBD::ID("0")) {
 577                 return g_strdup(abstract_path);
 578         }
 579
 580         char* ret = NULL;
 581         if (g_path_is_absolute(abstract_path)) {
 582                 ret = g_strdup(abstract_path);
 583         } else {
 584                 const std::string apath(abstract_path);
 585                 const std::string path = Glib::build_filename(me->state_dir(), apath);
 586                 ret = g_strndup(path.c_str(), path.length());
 587         }
 588
 589         DEBUG_TRACE(DEBUG::LV2, string_compose("absolute path %1 => %2\n",
 590                                                abstract_path, ret));
 591
 592         return ret;
 593 }
 594
 595 char*
 596 LV2Plugin::lv2_state_make_path(LV2_State_Make_Path_Handle handle,
 597                                const char*                path)
 598 {
 599         LV2Plugin* me = (LV2Plugin*)handle;
 600         if (me->_insert_id == PBD::ID("0")) {
 601                 return g_strdup(path);
 602         }
 603
 604         const std::string abs_path = Glib::build_filename(me->state_dir(), path);
 605         const std::string dirname  = Glib::path_get_dirname(abs_path);
 606
 607         g_mkdir_with_parents(dirname.c_str(), 0744);
 608
 609         DEBUG_TRACE(DEBUG::LV2, string_compose("new file path %1 => %2\n",
 610                                                path, abs_path));
 611
 612         return g_strndup(abs_path.c_str(), abs_path.length());
 613 }
 614
 615 static void
 616 remove_directory(const std::string& path)
 617 {
 618         if (!Glib::file_test(path, Glib::FILE_TEST_IS_DIR)) {
 619                 return;
 620         }
 621
 622         Glib::RefPtr<Gio::File>           dir = Gio::File::create_for_path(path);
 623         Glib::RefPtr<Gio::FileEnumerator> e   = dir->enumerate_children();
 624         Glib::RefPtr<Gio::FileInfo>       fi;
 625         while ((fi = e->next_file())) {
 626                 if (fi->get_type() == Gio::FILE_TYPE_DIRECTORY) {
 627                         remove_directory(fi->get_name());
 628                 } else {
 629                         dir->get_child(fi->get_name())->remove();
 630                 }
 631         }
 632         dir->remove();
 633 }
 634
 635 void
 636 LV2Plugin::add_state(XMLNode* root) const
 637 {
 638         assert(_insert_id != PBD::ID("0"));
 639
 640         XMLNode*    child;
 641         char        buf[16];
 642         LocaleGuard lg(X_("POSIX"));
 643
 644         for (uint32_t i = 0; i < parameter_count(); ++i) {
 645                 if (parameter_is_input(i) && parameter_is_control(i)) {
 646                         child = new XMLNode("Port");
 647                         child->add_property("symbol", port_symbol(i));
 648                         snprintf(buf, sizeof(buf), "%+f", _shadow_data[i]);
 649                         child->add_property("value", string(buf));
 650                         root->add_child_nocopy(*child);
 651                 }
 652         }
 653
 654         if (_has_state_interface) {
 655                 // Create state directory for this plugin instance
 656                 cerr << "Create statefile name from ID " << _insert_id << endl;
 657                 const std::string state_filename = _insert_id.to_s() + ".rdff";
 658                 const std::string state_path     = Glib::build_filename(
 659                         _session.plugins_dir(), state_filename);
 660
 661                 cout << "Saving LV2 plugin state to " << state_path << endl;
 662
 663                 // Get LV2 State extension data from plugin instance
 664                 LV2_State_Interface* state_iface = (LV2_State_Interface*)extension_data(
 665                         LV2_STATE_INTERFACE_URI);
 666                 if (!state_iface) {
 667                         warning << string_compose(
 668                             _("Plugin \"%1\% failed to return LV2 state interface"),
 669                             unique_id());
 670                         return;
 671                 }
 672
 673                 // Remove old state directory (FIXME: should this be preserved?)
 674                 remove_directory(state_dir());
 675
 676                 // Save plugin state to state object
 677                 LV2State state(*this, _uri_map);
 678                 state_iface->save(_impl->instance->lv2_handle,
 679                                   &LV2Plugin::lv2_state_store_callback,
 680                                   &state,
 681                                   LV2_STATE_IS_POD|LV2_STATE_IS_PORTABLE,
 682                                   NULL);
 683
 684                 // Write state object to RDFF file
 685                 RDFF file = rdff_open(state_path.c_str(), true);
 686                 state.write(file);
 687                 rdff_close(file);
 688
 689                 root->add_property("state-file", state_filename);
 690         }
 691 }
 692
 693 static inline const LilvNode*
 694 get_value(LilvWorld* world, const LilvNode* subject, const LilvNode* predicate)
 695 {
 696         LilvNodes* vs = lilv_world_find_nodes(world, subject, predicate, NULL);
 697         return vs ? lilv_nodes_get_first(vs) : NULL;
 698 }
 699
 700 static void
 701 find_presets_helper(LilvWorld*                                   world,
 702                     LilvPlugin*                                  plugin,
 703                     std::map<std::string, Plugin::PresetRecord>& out,
 704                     LilvNode*                                    preset_pred,
 705                     LilvNode*                                    title_pred)
 706 {
 707         LilvNodes* presets = lilv_plugin_get_value(plugin, preset_pred);
 708         LILV_FOREACH(nodes, i, presets) {
 709                 const LilvNode* preset = lilv_nodes_get(presets, i);
 710                 const LilvNode* name   = get_value(world, preset, title_pred);
 711                 if (name) {
 712                         out.insert(std::make_pair(lilv_node_as_string(preset),
 713                                                   Plugin::PresetRecord(
 714                                                           lilv_node_as_string(preset),
 715                                                           lilv_node_as_string(name))));
 716                 } else {
 717                         warning << string_compose(
 718                             _("Plugin \"%1\% preset \"%2%\" is missing a label\n"),
 719                             lilv_node_as_string(lilv_plugin_get_uri(plugin)),
 720                             lilv_node_as_string(preset));
 721                 }
 722         }
 723         lilv_nodes_free(presets);
 724 }
 725
 726 void
 727 LV2Plugin::find_presets()
 728 {
 729         LilvNode* dc_title          = lilv_new_uri(_world.world, NS_DC   "title");
 730         LilvNode* oldpset_hasPreset = lilv_new_uri(_world.world, NS_OLDPSET "hasPreset");
 731         LilvNode* pset_hasPreset    = lilv_new_uri(_world.world, NS_PSET "hasPreset");
 732         LilvNode* rdfs_label        = lilv_new_uri(_world.world, NS_RDFS "label");
 733
 734         find_presets_helper(_world.world, _impl->plugin, _presets,
 735                             oldpset_hasPreset, dc_title);
 736
 737         find_presets_helper(_world.world, _impl->plugin, _presets,
 738                             pset_hasPreset, rdfs_label);
 739
 740         lilv_node_free(rdfs_label);
 741         lilv_node_free(pset_hasPreset);
 742         lilv_node_free(oldpset_hasPreset);
 743         lilv_node_free(dc_title);
 744 }
 745
 746 bool
 747 LV2Plugin::load_preset(PresetRecord r)
 748 {
 749         Plugin::load_preset(r);
 750
 751         LilvNode* lv2_port      = lilv_new_uri(_world.world, NS_LV2 "port");
 752         LilvNode* lv2_symbol    = lilv_new_uri(_world.world, NS_LV2 "symbol");
 753         LilvNode* oldpset_value = lilv_new_uri(_world.world, NS_OLDPSET "value");
 754         LilvNode* preset        = lilv_new_uri(_world.world, r.uri.c_str());
 755         LilvNode* pset_value    = lilv_new_uri(_world.world, NS_PSET "value");
 756
 757         LilvNodes* ports = lilv_world_find_nodes(_world.world, preset, lv2_port, NULL);
 758         LILV_FOREACH(nodes, i, ports) {
 759                 const LilvNode* port   = lilv_nodes_get(ports, i);
 760                 const LilvNode* symbol = get_value(_world.world, port, lv2_symbol);
 761                 const LilvNode* value  = get_value(_world.world, port, pset_value);
 762                 if (!value) {
 763                         value = get_value(_world.world, port, oldpset_value);
 764                 }
 765                 if (value && lilv_node_is_float(value)) {
 766                         set_parameter(_port_indices[lilv_node_as_string(symbol)],
 767                                       lilv_node_as_float(value));
 768                 }
 769         }
 770         lilv_nodes_free(ports);
 771
 772         lilv_node_free(pset_value);
 773         lilv_node_free(preset);
 774         lilv_node_free(oldpset_value);
 775         lilv_node_free(lv2_symbol);
 776         lilv_node_free(lv2_port);
 777
 778         return true;
 779 }
 780
 781 std::string
 782 LV2Plugin::do_save_preset(string /*name*/)
 783 {
 784         return "";
 785 }
 786
 787 void
 788 LV2Plugin::do_remove_preset(string /*name*/)
 789 {}
 790
 791 bool
 792 LV2Plugin::has_editor() const
 793 {
 794         return _impl->ui != NULL;
 795 }
 796
 797 void
 798 LV2Plugin::set_insert_info(const PluginInsert* insert)
 799 {
 800         _insert_id = insert->id();
 801 }
 802
 803 int
 804 LV2Plugin::set_state(const XMLNode& node, int version)
 805 {
 806         XMLNodeList          nodes;
 807         const XMLProperty*   prop;
 808         XMLNodeConstIterator iter;
 809         XMLNode*             child;
 810         const char*          sym;
 811         const char*          value;
 812         uint32_t             port_id;
 813         LocaleGuard          lg(X_("POSIX"));
 814
 815         if (node.name() != state_node_name()) {
 816                 error << _("Bad node sent to LV2Plugin::set_state") << endmsg;
 817                 return -1;
 818         }
 819
 820         if (version < 3000) {
 821                 nodes = node.children("port");
 822         } else {
 823                 nodes = node.children("Port");
 824         }
 825
 826         for (iter = nodes.begin(); iter != nodes.end(); ++iter) {
 827
 828                 child = *iter;
 829
 830                 if ((prop = child->property("symbol")) != 0) {
 831                         sym = prop->value().c_str();
 832                 } else {
 833                         warning << _("LV2: port has no symbol, ignored") << endmsg;
 834                         continue;
 835                 }
 836
 837                 map<string, uint32_t>::iterator i = _port_indices.find(sym);
 838
 839                 if (i != _port_indices.end()) {
 840                         port_id = i->second;
 841                 } else {
 842                         warning << _("LV2: port has unknown index, ignored") << endmsg;
 843                         continue;
 844                 }
 845
 846                 if ((prop = child->property("value")) != 0) {
 847                         value = prop->value().c_str();
 848                 } else {
 849                         warning << _("LV2: port has no value, ignored") << endmsg;
 850                         continue;
 851                 }
 852
 853                 set_parameter(port_id, atof(value));
 854         }
 855
 856         if ((prop = node.property("state-file")) != 0) {
 857                 std::string state_path = Glib::build_filename(_session.plugins_dir(),
 858                                                               prop->value());
 859
 860                 cout << "LV2 state path " << state_path << endl;
 861
 862                 // Get LV2 State extension data from plugin instance
 863                 LV2_State_Interface* state_iface = (LV2_State_Interface*)extension_data(
 864                         LV2_STATE_INTERFACE_URI);
 865                 if (state_iface) {
 866                         cout << "Loading LV2 state from " << state_path << endl;
 867                         RDFF     file = rdff_open(state_path.c_str(), false);
 868                         LV2State state(*this, _uri_map);
 869                         state.read(file);
 870                         state_iface->restore(_impl->instance->lv2_handle,
 871                                              &LV2Plugin::lv2_state_retrieve_callback,
 872                                              &state,
 873                                              LV2_STATE_IS_POD|LV2_STATE_IS_PORTABLE,
 874                                              NULL);
 875                         rdff_close(file);
 876                 } else {
 877                         warning << string_compose(
 878                             _("Plugin \"%1\% failed to return LV2 state interface"),
 879                             unique_id());
 880                 }
 881         }
 882
 883         latency_compute_run();
 884
 885         return Plugin::set_state(node, version);
 886 }
 887
 888 int
 889 LV2Plugin::get_parameter_descriptor(uint32_t which, ParameterDescriptor& desc) const
 890 {
 891         const LilvPort* port = lilv_plugin_get_port_by_index(_impl->plugin, which);
 892
 893         LilvNode *def, *min, *max;
 894         lilv_port_get_range(_impl->plugin, port, &def, &min, &max);
 895
 896         desc.integer_step = lilv_port_has_property(_impl->plugin, port, _world.integer);
 897         desc.toggled      = lilv_port_has_property(_impl->plugin, port, _world.toggled);
 898         desc.logarithmic  = lilv_port_has_property(_impl->plugin, port, _world.logarithmic);
 899         desc.sr_dependent = lilv_port_has_property(_impl->plugin, port, _world.srate);
 900         desc.label        = lilv_node_as_string(lilv_port_get_name(_impl->plugin, port));
 901         desc.lower        = min ? lilv_node_as_float(min) : 0.0f;
 902         desc.upper        = max ? lilv_node_as_float(max) : 1.0f;
 903         if (desc.sr_dependent) {
 904                 desc.lower *= _session.frame_rate ();
 905                 desc.upper *= _session.frame_rate ();
 906         }
 907
 908         desc.min_unbound  = false; // TODO: LV2 extension required
 909         desc.max_unbound  = false; // TODO: LV2 extension required
 910
 911         if (desc.integer_step) {
 912                 desc.step      = 1.0;
 913                 desc.smallstep = 0.1;
 914                 desc.largestep = 10.0;
 915         } else {
 916                 const float delta = desc.upper - desc.lower;
 917                 desc.step      = delta / 1000.0f;
 918                 desc.smallstep = delta / 10000.0f;
 919                 desc.largestep = delta / 10.0f;
 920         }
 921
 922         lilv_node_free(def);
 923         lilv_node_free(min);
 924         lilv_node_free(max);
 925
 926         return 0;
 927 }
 928
 929 string
 930 LV2Plugin::describe_parameter(Evoral::Parameter which)
 931 {
 932         if (( which.type() == PluginAutomation) && ( which.id() < parameter_count()) ) {
 933                 LilvNode* name = lilv_port_get_name(_impl->plugin,
 934                                                     lilv_plugin_get_port_by_index(_impl->plugin, which.id()));
 935                 string ret(lilv_node_as_string(name));
 936                 lilv_node_free(name);
 937                 return ret;
 938         } else {
 939                 return "??";
 940         }
 941 }
 942
 943 framecnt_t
 944 LV2Plugin::signal_latency() const
 945 {
 946         if (_latency_control_port) {
 947                 return (framecnt_t)floor(*_latency_control_port);
 948         } else {
 949                 return 0;
 950         }
 951 }
 952
 953 set<Evoral::Parameter>
 954 LV2Plugin::automatable() const
 955 {
 956         set<Evoral::Parameter> ret;
 957
 958         for (uint32_t i = 0; i < parameter_count(); ++i) {
 959                 if (parameter_is_input(i) && parameter_is_control(i)) {
 960                         ret.insert(ret.end(), Evoral::Parameter(PluginAutomation, 0, i));
 961                 }
 962         }
 963
 964         return ret;
 965 }
 966
 967 void
 968 LV2Plugin::activate()
 969 {
 970         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 activate\n", name()));
 971
 972         if (!_was_activated) {
 973                 lilv_instance_activate(_impl->instance);
 974                 _was_activated = true;
 975         }
 976 }
 977
 978 void
 979 LV2Plugin::deactivate()
 980 {
 981         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 deactivate\n", name()));
 982
 983         if (_was_activated) {
 984                 lilv_instance_deactivate(_impl->instance);
 985                 _was_activated = false;
 986         }
 987 }
 988
 989 void
 990 LV2Plugin::cleanup()
 991 {
 992         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 cleanup\n", name()));
 993
 994         activate();
 995         deactivate();
 996         lilv_instance_free(_impl->instance);
 997         _impl->instance = NULL;
 998 }
 999
1000 int
1001 LV2Plugin::connect_and_run(BufferSet& bufs,
1002         ChanMapping in_map, ChanMapping out_map,
1003         pframes_t nframes, framecnt_t offset)
1004 {
1005         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 run %2 offset %3\n", name(), nframes, offset));
1006         Plugin::connect_and_run(bufs, in_map, out_map, nframes, offset);
1007
1008         cycles_t then = get_cycles();
1009
1010         ChanCount bufs_count;
1011         bufs_count.set(DataType::AUDIO, 1);
1012         bufs_count.set(DataType::MIDI, 1);
1013         BufferSet& silent_bufs  = _session.get_silent_buffers(bufs_count);
1014         BufferSet& scratch_bufs = _session.get_silent_buffers(bufs_count);
1015         uint32_t const num_ports = parameter_count();
1016
1017         uint32_t audio_in_index  = 0;
1018         uint32_t audio_out_index = 0;
1019         uint32_t midi_in_index   = 0;
1020         uint32_t midi_out_index  = 0;
1021         bool valid;
1022         for (uint32_t port_index = 0; port_index < num_ports; ++port_index) {
1023                 if (parameter_is_audio(port_index)) {
1024                         if (parameter_is_input(port_index)) {
1025                                 const uint32_t buf_index = in_map.get(DataType::AUDIO, audio_in_index++, &valid);
1026                                 lilv_instance_connect_port(_impl->instance, port_index,
1027                                                            valid ? bufs.get_audio(buf_index).data(offset)
1028                                                                  : silent_bufs.get_audio(0).data(offset));
1029                         } else if (parameter_is_output(port_index)) {
1030                                 const uint32_t buf_index = out_map.get(DataType::AUDIO, audio_out_index++, &valid);
1031                                 //cerr << port_index << " : " << " AUDIO OUT " << buf_index << endl;
1032                                 lilv_instance_connect_port(_impl->instance, port_index,
1033                                                            valid ? bufs.get_audio(buf_index).data(offset)
1034                                                                  : scratch_bufs.get_audio(0).data(offset));
1035                         }
1036                 } else if (parameter_is_midi(port_index)) {
1037                         /* FIXME: The checks here for bufs.count().n_midi() > buf_index shouldn't
1038                            be necessary, but the mapping is illegal in some cases.  Ideally
1039                            that should be fixed, but this is easier...
1040                         */
1041                         if (parameter_is_input(port_index)) {
1042                                 const uint32_t buf_index = in_map.get(DataType::MIDI, midi_in_index++, &valid);
1043                                 if (valid && bufs.count().n_midi() > buf_index) {
1044                                         lilv_instance_connect_port(_impl->instance, port_index,
1045                                                                    bufs.get_lv2_midi(true, buf_index).data());
1046                                 } else {
1047                                         lilv_instance_connect_port(_impl->instance, port_index,
1048                                                                    silent_bufs.get_lv2_midi(true, 0).data());
1049                                 }
1050                         } else if (parameter_is_output(port_index)) {
1051                                 const uint32_t buf_index = out_map.get(DataType::MIDI, midi_out_index++, &valid);
1052                                 if (valid && bufs.count().n_midi() > buf_index) {
1053                                         lilv_instance_connect_port(_impl->instance, port_index,
1054                                                                    bufs.get_lv2_midi(false, buf_index).data());
1055                                 } else {
1056                                         lilv_instance_connect_port(_impl->instance, port_index,
1057                                                                    scratch_bufs.get_lv2_midi(true, 0).data());
1058                                 }
1059                         }
1060                 } else if (!parameter_is_control(port_index)) {
1061                         // Optional port (it'd better be if we've made it this far...)
1062                         lilv_instance_connect_port(_impl->instance, port_index, NULL);
1063                 }
1064         }
1065
1066         run(nframes);
1067
1068         midi_out_index = 0;
1069         for (uint32_t port_index = 0; port_index < num_ports; ++port_index) {
1070                 if (parameter_is_midi(port_index) && parameter_is_output(port_index)) {
1071                         const uint32_t buf_index = out_map.get(DataType::MIDI, midi_out_index++, &valid);
1072                         if (valid) {
1073                                 bufs.flush_lv2_midi(true, buf_index);
1074                         }
1075                 }
1076         }
1077
1078         cycles_t now = get_cycles();
1079         set_cycles((uint32_t)(now - then));
1080
1081         return 0;
1082 }
1083
1084 bool
1085 LV2Plugin::parameter_is_control(uint32_t param) const
1086 {
1087         assert(param < _port_is_control.size());
1088         return _port_is_control[param];
1089 }
1090
1091 bool
1092 LV2Plugin::parameter_is_audio(uint32_t param) const
1093 {
1094         assert(param < _port_is_audio.size());
1095         return _port_is_audio[param];
1096 }
1097
1098 bool
1099 LV2Plugin::parameter_is_midi(uint32_t param) const
1100 {
1101         assert(param < _port_is_midi.size());
1102         return _port_is_midi[param];
1103 }
1104
1105 bool
1106 LV2Plugin::parameter_is_output(uint32_t param) const
1107 {
1108         assert(param < _port_is_output.size());
1109         return _port_is_output[param];
1110 }
1111
1112 bool
1113 LV2Plugin::parameter_is_input(uint32_t param) const
1114 {
1115         assert(param < _port_is_input.size());
1116         return _port_is_input[param];
1117 }
1118
1119 void
1120 LV2Plugin::print_parameter(uint32_t param, char* buf, uint32_t len) const
1121 {
1122         if (buf && len) {
1123                 if (param < parameter_count()) {
1124                         snprintf(buf, len, "%.3f", get_parameter(param));
1125                 } else {
1126                         strcat(buf, "0");
1127                 }
1128         }
1129 }
1130
1131 boost::shared_ptr<Plugin::ScalePoints>
1132 LV2Plugin::get_scale_points(uint32_t port_index) const
1133 {
1134         const LilvPort*  port   = lilv_plugin_get_port_by_index(_impl->plugin, port_index);
1135         LilvScalePoints* points = lilv_port_get_scale_points(_impl->plugin, port);
1136
1137         boost::shared_ptr<Plugin::ScalePoints> ret;
1138         if (!points) {
1139                 return ret;
1140         }
1141
1142         ret = boost::shared_ptr<Plugin::ScalePoints>(new ScalePoints());
1143
1144         LILV_FOREACH(scale_points, i, points) {
1145                 const LilvScalePoint* p     = lilv_scale_points_get(points, i);
1146                 const LilvNode*       label = lilv_scale_point_get_label(p);
1147                 const LilvNode*       value = lilv_scale_point_get_value(p);
1148                 if (label && (lilv_node_is_float(value) || lilv_node_is_int(value))) {
1149                         ret->insert(make_pair(lilv_node_as_string(label),
1150                                               lilv_node_as_float(value)));
1151                 }
1152         }
1153
1154         lilv_scale_points_free(points);
1155         return ret;
1156 }
1157
1158 void
1159 LV2Plugin::run(pframes_t nframes)
1160 {
1161         uint32_t const N = parameter_count();
1162         for (uint32_t i = 0; i < N; ++i) {
1163                 if (parameter_is_control(i) && parameter_is_input(i)) {
1164                         _control_data[i] = _shadow_data[i];
1165                 }
1166         }
1167
1168         lilv_instance_run(_impl->instance, nframes);
1169 }
1170
1171 void
1172 LV2Plugin::latency_compute_run()
1173 {
1174         if (!_latency_control_port) {
1175                 return;
1176         }
1177
1178         // Run the plugin so that it can set its latency parameter
1179
1180         activate();
1181
1182         uint32_t port_index = 0;
1183         uint32_t in_index   = 0;
1184         uint32_t out_index  = 0;
1185
1186         const framecnt_t bufsize = 1024;
1187         float            buffer[bufsize];
1188
1189         memset(buffer, 0, sizeof(float) * bufsize);
1190
1191         // FIXME: Ensure plugins can handle in-place processing
1192
1193         port_index = 0;
1194
1195         while (port_index < parameter_count()) {
1196                 if (parameter_is_audio(port_index)) {
1197                         if (parameter_is_input(port_index)) {
1198                                 lilv_instance_connect_port(_impl->instance, port_index, buffer);
1199                                 in_index++;
1200                         } else if (parameter_is_output(port_index)) {
1201                                 lilv_instance_connect_port(_impl->instance, port_index, buffer);
1202                                 out_index++;
1203                         }
1204                 }
1205                 port_index++;
1206         }
1207
1208         run(bufsize);
1209         deactivate();
1210 }
1211
1212 LV2World::LV2World()
1213         : world(lilv_world_new())
1214 {
1215         lilv_world_load_all(world);
1216         input_class     = lilv_new_uri(world, LILV_URI_INPUT_PORT);
1217         output_class    = lilv_new_uri(world, LILV_URI_OUTPUT_PORT);
1218         control_class   = lilv_new_uri(world, LILV_URI_CONTROL_PORT);
1219         audio_class     = lilv_new_uri(world, LILV_URI_AUDIO_PORT);
1220         event_class     = lilv_new_uri(world, LILV_URI_EVENT_PORT);
1221         midi_class      = lilv_new_uri(world, LILV_URI_MIDI_EVENT);
1222         in_place_broken = lilv_new_uri(world, LILV_NS_LV2 "inPlaceBroken");
1223         integer         = lilv_new_uri(world, LILV_NS_LV2 "integer");
1224         toggled         = lilv_new_uri(world, LILV_NS_LV2 "toggled");
1225         srate           = lilv_new_uri(world, LILV_NS_LV2 "sampleRate");
1226         gtk_gui         = lilv_new_uri(world, NS_UI "GtkUI");
1227         external_gui    = lilv_new_uri(world, NS_UI "external");
1228         logarithmic     = lilv_new_uri(world, "http://lv2plug.in/ns/dev/extportinfo#logarithmic");
1229 }
1230
1231 LV2World::~LV2World()
1232 {
1233         lilv_node_free(input_class);
1234         lilv_node_free(output_class);
1235         lilv_node_free(control_class);
1236         lilv_node_free(audio_class);
1237         lilv_node_free(event_class);
1238         lilv_node_free(midi_class);
1239         lilv_node_free(in_place_broken);
1240 }
1241
1242 LV2PluginInfo::LV2PluginInfo (void* c_plugin)
1243         : _c_plugin(c_plugin)
1244 {
1245         type = ARDOUR::LV2;
1246 }
1247
1248 LV2PluginInfo::~LV2PluginInfo()
1249 {}
1250
1251 PluginPtr
1252 LV2PluginInfo::load(Session& session)
1253 {
1254         try {
1255                 PluginPtr plugin;
1256
1257                 plugin.reset(new LV2Plugin(session.engine(), session,
1258                                            (LilvPlugin*)_c_plugin,
1259                                            session.frame_rate()));
1260
1261                 plugin->set_info(PluginInfoPtr(new LV2PluginInfo(*this)));
1262                 return plugin;
1263         } catch (failed_constructor& err) {
1264                 return PluginPtr((Plugin*)0);
1265         }
1266
1267         return PluginPtr();
1268 }
1269
1270 PluginInfoList*
1271 LV2PluginInfo::discover()
1272 {
1273         PluginInfoList*    plugs   = new PluginInfoList;
1274         const LilvPlugins* plugins = lilv_world_get_all_plugins(_world.world);
1275
1276         cerr << "LV2: Discovering " << lilv_plugins_size(plugins) << " plugins" << endl;
1277
1278         LILV_FOREACH(plugins, i, plugins) {
1279                 const LilvPlugin* p = lilv_plugins_get(plugins, i);
1280                 LV2PluginInfoPtr  info(new LV2PluginInfo((void*)p));
1281
1282                 LilvNode* name = lilv_plugin_get_name(p);
1283                 if (!name) {
1284                         cerr << "LV2: invalid plugin\n";
1285                         continue;
1286                 }
1287
1288                 info->type = LV2;
1289
1290                 info->name = string(lilv_node_as_string(name));
1291                 lilv_node_free(name);
1292
1293                 const LilvPluginClass* pclass = lilv_plugin_get_class(p);
1294                 const LilvNode*        label  = lilv_plugin_class_get_label(pclass);
1295                 info->category = lilv_node_as_string(label);
1296
1297                 LilvNode* author_name = lilv_plugin_get_author_name(p);
1298                 info->creator = author_name ? string(lilv_node_as_string(author_name)) : "Unknown";
1299                 lilv_node_free(author_name);
1300
1301                 info->path = "/NOPATH"; // Meaningless for LV2
1302
1303                 info->n_inputs.set_audio(
1304                         lilv_plugin_get_num_ports_of_class(
1305                                 p, _world.input_class, _world.audio_class, NULL));
1306                 info->n_inputs.set_midi(
1307                         lilv_plugin_get_num_ports_of_class(
1308                                 p, _world.input_class, _world.event_class, NULL));
1309
1310                 info->n_outputs.set_audio(
1311                         lilv_plugin_get_num_ports_of_class(
1312                                 p, _world.output_class, _world.audio_class, NULL));
1313                 info->n_outputs.set_midi(
1314                         lilv_plugin_get_num_ports_of_class(
1315                                 p, _world.output_class, _world.event_class, NULL));
1316
1317                 info->unique_id = lilv_node_as_uri(lilv_plugin_get_uri(p));
1318                 info->index     = 0; // Meaningless for LV2
1319
1320                 plugs->push_back(info);
1321         }
1322
1323         cerr << "Done LV2 discovery" << endl;
1324
1325         return plugs;
1326 }