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