libs/ardour/lv2_plugin.cc

   1 /*
   2     Copyright (C) 2008-2012 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 #include <cctype>
  21 #include <string>
  22 #include <vector>
  23 #include <limits>
  24
  25 #include <cmath>
  26 #include <cstdlib>
  27 #include <cstring>
  28
  29 #include "pbd/gstdio_compat.h"
  30 #include <glib/gprintf.h>
  31 #include <glibmm.h>
  32
  33 #include <boost/utility.hpp>
  34
  35 #include "pbd/file_utils.h"
  36 #include "pbd/stl_delete.h"
  37 #include "pbd/compose.h"
  38 #include "pbd/error.h"
  39 #include "pbd/replace_all.h"
  40 #include "pbd/xml++.h"
  41
  42 #include "libardour-config.h"
  43
  44 #include "ardour/audio_buffer.h"
  45 #include "ardour/audioengine.h"
  46 #include "ardour/debug.h"
  47 #include "ardour/lv2_plugin.h"
  48 #include "ardour/midi_patch_manager.h"
  49 #include "ardour/session.h"
  50 #include "ardour/tempo.h"
  51 #include "ardour/types.h"
  52 #include "ardour/utils.h"
  53 #include "ardour/worker.h"
  54 #include "ardour/search_paths.h"
  55
  56 #include "pbd/i18n.h"
  57 #include <locale.h>
  58
  59 #include <lilv/lilv.h>
  60
  61 #include "lv2/lv2plug.in/ns/ext/atom/atom.h"
  62 #include "lv2/lv2plug.in/ns/ext/atom/forge.h"
  63 #include "lv2/lv2plug.in/ns/ext/log/log.h"
  64 #include "lv2/lv2plug.in/ns/ext/midi/midi.h"
  65 #include "lv2/lv2plug.in/ns/ext/port-props/port-props.h"
  66 #include "lv2/lv2plug.in/ns/ext/presets/presets.h"
  67 #include "lv2/lv2plug.in/ns/ext/state/state.h"
  68 #include "lv2/lv2plug.in/ns/ext/time/time.h"
  69 #include "lv2/lv2plug.in/ns/ext/worker/worker.h"
  70 #include "lv2/lv2plug.in/ns/ext/resize-port/resize-port.h"
  71 #include "lv2/lv2plug.in/ns/extensions/ui/ui.h"
  72 #include "lv2/lv2plug.in/ns/extensions/units/units.h"
  73 #include "lv2/lv2plug.in/ns/ext/patch/patch.h"
  74 #include "lv2/lv2plug.in/ns/ext/port-groups/port-groups.h"
  75 #ifdef HAVE_LV2_1_2_0
  76 #include "lv2/lv2plug.in/ns/ext/buf-size/buf-size.h"
  77 #include "lv2/lv2plug.in/ns/ext/options/options.h"
  78 #endif
  79
  80 #include "lv2_evbuf.h"
  81
  82 #ifdef HAVE_SUIL
  83 #include <suil/suil.h>
  84 #endif
  85
  86 // Compatibility for old LV2
  87 #ifndef LV2_ATOM_CONTENTS_CONST
  88 #define LV2_ATOM_CONTENTS_CONST(type, atom) \
  89         ((const void*)((const uint8_t*)(atom) + sizeof(type)))
  90 #endif
  91 #ifndef LV2_ATOM_BODY_CONST
  92 #define LV2_ATOM_BODY_CONST(atom) LV2_ATOM_CONTENTS_CONST(LV2_Atom, atom)
  93 #endif
  94 #ifndef LV2_PATCH__property
  95 #define LV2_PATCH__property LV2_PATCH_PREFIX "property"
  96 #endif
  97 #ifndef LV2_PATCH__value
  98 #define LV2_PATCH__value LV2_PATCH_PREFIX "value"
  99 #endif
 100 #ifndef LV2_PATCH__writable
 101 #define LV2_PATCH__writable LV2_PATCH_PREFIX "writable"
 102 #endif
 103
 104 /** The number of MIDI buffers that will fit in a UI/worker comm buffer.
 105     This needs to be roughly the number of cycles the UI will get around to
 106     actually processing the traffic.  Lower values are flakier but save memory.
 107 */
 108 static const size_t NBUFS = 4;
 109
 110 using namespace std;
 111 using namespace ARDOUR;
 112 using namespace PBD;
 113
 114 bool LV2Plugin::force_state_save = false;
 115
 116 class LV2World : boost::noncopyable {
 117 public:
 118         LV2World ();
 119         ~LV2World ();
 120
 121         void load_bundled_plugins(bool verbose=false);
 122
 123         LilvWorld* world;
 124
 125         LilvNode* atom_AtomPort;
 126         LilvNode* atom_Chunk;
 127         LilvNode* atom_Sequence;
 128         LilvNode* atom_bufferType;
 129         LilvNode* atom_eventTransfer;
 130         LilvNode* atom_supports;
 131         LilvNode* ev_EventPort;
 132         LilvNode* ext_logarithmic;
 133         LilvNode* ext_notOnGUI;
 134         LilvNode* ext_expensive;
 135         LilvNode* ext_causesArtifacts;
 136         LilvNode* ext_notAutomatic;
 137         LilvNode* ext_rangeSteps;
 138         LilvNode* groups_group;
 139         LilvNode* groups_element;
 140         LilvNode* lv2_AudioPort;
 141         LilvNode* lv2_ControlPort;
 142         LilvNode* lv2_InputPort;
 143         LilvNode* lv2_OutputPort;
 144         LilvNode* lv2_designation;
 145         LilvNode* lv2_enumeration;
 146         LilvNode* lv2_freewheeling;
 147         LilvNode* lv2_inPlaceBroken;
 148         LilvNode* lv2_isSideChain;
 149         LilvNode* lv2_index;
 150         LilvNode* lv2_integer;
 151         LilvNode* lv2_default;
 152         LilvNode* lv2_minimum;
 153         LilvNode* lv2_maximum;
 154         LilvNode* lv2_reportsLatency;
 155         LilvNode* lv2_sampleRate;
 156         LilvNode* lv2_toggled;
 157         LilvNode* midi_MidiEvent;
 158         LilvNode* rdfs_comment;
 159         LilvNode* rdfs_label;
 160         LilvNode* rdfs_range;
 161         LilvNode* rsz_minimumSize;
 162         LilvNode* time_Position;
 163         LilvNode* ui_GtkUI;
 164         LilvNode* ui_external;
 165         LilvNode* ui_externalkx;
 166         LilvNode* units_hz;
 167         LilvNode* units_db;
 168         LilvNode* units_unit;
 169         LilvNode* units_render;
 170         LilvNode* units_midiNote;
 171         LilvNode* patch_writable;
 172         LilvNode* patch_Message;
 173 #ifdef HAVE_LV2_1_2_0
 174         LilvNode* bufz_powerOf2BlockLength;
 175         LilvNode* bufz_fixedBlockLength;
 176         LilvNode* bufz_nominalBlockLength;
 177         LilvNode* bufz_coarseBlockLength;
 178 #endif
 179
 180 #ifdef HAVE_LV2_1_10_0
 181         LilvNode* atom_int;
 182         LilvNode* atom_float;
 183         LilvNode* atom_object; // new in 1.8
 184         LilvNode* atom_vector;
 185 #endif
 186 #ifdef LV2_EXTENDED
 187         LilvNode* lv2_noSampleAccurateCtrl;
 188         LilvNode* auto_can_write_automatation; // lv2:optionalFeature
 189         LilvNode* auto_automation_control; // atom:supports
 190         LilvNode* auto_automation_controlled; // lv2:portProperty
 191         LilvNode* auto_automation_controller; // lv2:portProperty
 192 #endif
 193
 194 private:
 195         bool _bundle_checked;
 196 };
 197
 198 static LV2World _world;
 199
 200 /* worker extension */
 201
 202 /** Called by the plugin to schedule non-RT work. */
 203 static LV2_Worker_Status
 204 work_schedule(LV2_Worker_Schedule_Handle handle,
 205               uint32_t                   size,
 206               const void*                data)
 207 {
 208         return (((Worker*)handle)->schedule(size, data)
 209                 ? LV2_WORKER_SUCCESS
 210                 : LV2_WORKER_ERR_UNKNOWN);
 211 }
 212
 213 /** Called by the plugin to respond to non-RT work. */
 214 static LV2_Worker_Status
 215 work_respond(LV2_Worker_Respond_Handle handle,
 216              uint32_t                  size,
 217              const void*               data)
 218 {
 219         return (((Worker*)handle)->respond(size, data)
 220                 ? LV2_WORKER_SUCCESS
 221                 : LV2_WORKER_ERR_UNKNOWN);
 222 }
 223
 224 #ifdef LV2_EXTENDED
 225 /* inline display extension */
 226 static void
 227 queue_draw (LV2_Inline_Display_Handle handle)
 228 {
 229         LV2Plugin* plugin = (LV2Plugin*)handle;
 230         plugin->QueueDraw(); /* EMIT SIGNAL */
 231 }
 232
 233 static void
 234 midnam_update (LV2_Midnam_Handle handle)
 235 {
 236         LV2Plugin* plugin = (LV2Plugin*)handle;
 237         plugin->UpdateMidnam (); /* EMIT SIGNAL */
 238 }
 239 #endif
 240
 241 /* log extension */
 242
 243 static int
 244 log_vprintf(LV2_Log_Handle /*handle*/,
 245             LV2_URID       type,
 246             const char*    fmt,
 247             va_list        args)
 248 {
 249         char* str = NULL;
 250         const int ret = g_vasprintf(&str, fmt, args);
 251         /* strip trailing whitespace */
 252         while (strlen (str) > 0 && isspace (str[strlen (str) - 1])) {
 253                 str[strlen (str) - 1] = '\0';
 254         }
 255         if (strlen (str) == 0) {
 256                 return 0;
 257         }
 258
 259         if (type == URIMap::instance().urids.log_Error) {
 260                 error << str << endmsg;
 261         } else if (type == URIMap::instance().urids.log_Warning) {
 262                 warning << str << endmsg;
 263         } else if (type == URIMap::instance().urids.log_Note) {
 264                 info << str << endmsg;
 265         } else if (type == URIMap::instance().urids.log_Trace) {
 266                 DEBUG_TRACE(DEBUG::LV2, str);
 267         }
 268         return ret;
 269 }
 270
 271 static int
 272 log_printf(LV2_Log_Handle handle,
 273            LV2_URID       type,
 274            const char*    fmt, ...)
 275 {
 276         va_list args;
 277         va_start(args, fmt);
 278         const int ret = log_vprintf(handle, type, fmt, args);
 279         va_end(args);
 280         return ret;
 281 }
 282
 283 struct LV2Plugin::Impl {
 284         Impl() : plugin(0), ui(0), ui_type(0), name(0), author(0), instance(0)
 285                , work_iface(0)
 286 #ifdef HAVE_LV2_1_2_0
 287                , opts_iface(0)
 288 #endif
 289                , state(0)
 290                , block_length(0)
 291 #ifdef HAVE_LV2_1_2_0
 292                , options(0)
 293 #endif
 294 #ifdef LV2_EXTENDED
 295                , queue_draw(0)
 296                , midnam(0)
 297 #endif
 298         {}
 299
 300         /** Find the LV2 input port with the given designation.
 301          * If found, bufptrs[port_index] will be set to bufptr.
 302          */
 303         const LilvPort* designated_input (const char* uri, void** bufptrs[], void** bufptr);
 304
 305         const LilvPlugin*            plugin;
 306         const LilvUI*                ui;
 307         const LilvNode*              ui_type;
 308         LilvNode*                    name;
 309         LilvNode*                    author;
 310         LilvInstance*                instance;
 311         const LV2_Worker_Interface*  work_iface;
 312 #ifdef HAVE_LV2_1_2_0
 313         const LV2_Options_Interface* opts_iface;
 314 #endif
 315         LilvState*                   state;
 316         LV2_Atom_Forge               forge;
 317         LV2_Atom_Forge               ui_forge;
 318         int32_t                      block_length;
 319 #ifdef HAVE_LV2_1_2_0
 320         LV2_Options_Option*          options;
 321 #endif
 322 #ifdef LV2_EXTENDED
 323         LV2_Inline_Display*          queue_draw;
 324         LV2_Midnam*                  midnam;
 325 #endif
 326 };
 327
 328 LV2Plugin::LV2Plugin (AudioEngine& engine,
 329                       Session&     session,
 330                       const void*  c_plugin,
 331                       framecnt_t   rate)
 332         : Plugin (engine, session)
 333         , Workee ()
 334         , _impl(new Impl())
 335         , _features(NULL)
 336         , _worker(NULL)
 337         , _state_worker(NULL)
 338         , _insert_id("0")
 339         , _patch_port_in_index((uint32_t)-1)
 340         , _patch_port_out_index((uint32_t)-1)
 341         , _uri_map(URIMap::instance())
 342         , _no_sample_accurate_ctrl (false)
 343 {
 344         init(c_plugin, rate);
 345 }
 346
 347 LV2Plugin::LV2Plugin (const LV2Plugin& other)
 348         : Plugin (other)
 349         , Workee ()
 350         , _impl(new Impl())
 351         , _features(NULL)
 352         , _worker(NULL)
 353         , _state_worker(NULL)
 354         , _insert_id(other._insert_id)
 355         , _patch_port_in_index((uint32_t)-1)
 356         , _patch_port_out_index((uint32_t)-1)
 357         , _uri_map(URIMap::instance())
 358         , _no_sample_accurate_ctrl (false)
 359 {
 360         init(other._impl->plugin, other._sample_rate);
 361
 362         for (uint32_t i = 0; i < parameter_count(); ++i) {
 363                 _control_data[i] = other._shadow_data[i];
 364                 _shadow_data[i]  = other._shadow_data[i];
 365         }
 366 }
 367
 368 void
 369 LV2Plugin::init(const void* c_plugin, framecnt_t rate)
 370 {
 371         DEBUG_TRACE(DEBUG::LV2, "init\n");
 372
 373         _impl->plugin           = (const LilvPlugin*)c_plugin;
 374         _impl->ui               = NULL;
 375         _impl->ui_type          = NULL;
 376         _to_ui                  = NULL;
 377         _from_ui                = NULL;
 378         _control_data           = 0;
 379         _shadow_data            = 0;
 380         _atom_ev_buffers        = 0;
 381         _ev_buffers             = 0;
 382         _bpm_control_port       = 0;
 383         _freewheel_control_port = 0;
 384         _latency_control_port   = 0;
 385         _next_cycle_start       = std::numeric_limits<framepos_t>::max();
 386         _next_cycle_speed       = 1.0;
 387         _seq_size               = _engine.raw_buffer_size(DataType::MIDI);
 388         _state_version          = 0;
 389         _was_activated          = false;
 390         _has_state_interface    = false;
 391         _can_write_automation   = false;
 392         _max_latency            = 0;
 393         _current_latency        = 0;
 394         _impl->block_length     = _session.get_block_size();
 395
 396         _instance_access_feature.URI = "http://lv2plug.in/ns/ext/instance-access";
 397         _data_access_feature.URI     = "http://lv2plug.in/ns/ext/data-access";
 398         _make_path_feature.URI       = LV2_STATE__makePath;
 399         _log_feature.URI             = LV2_LOG__log;
 400         _work_schedule_feature.URI   = LV2_WORKER__schedule;
 401         _work_schedule_feature.data  = NULL;
 402         _def_state_feature.URI       = LV2_STATE_PREFIX "loadDefaultState";  // Post LV2-1.2.0
 403         _def_state_feature.data      = NULL;
 404
 405         const LilvPlugin* plugin = _impl->plugin;
 406
 407         LilvNode* state_iface_uri = lilv_new_uri(_world.world, LV2_STATE__interface);
 408         LilvNode* state_uri       = lilv_new_uri(_world.world, LV2_STATE_URI);
 409         _has_state_interface =
 410                 // What plugins should have (lv2:extensionData state:Interface)
 411                 lilv_plugin_has_extension_data(plugin, state_iface_uri)
 412                 // What some outdated/incorrect ones have
 413                 || lilv_plugin_has_feature(plugin, state_uri);
 414         lilv_node_free(state_uri);
 415         lilv_node_free(state_iface_uri);
 416
 417         _features    = (LV2_Feature**)calloc(13, sizeof(LV2_Feature*));
 418         _features[0] = &_instance_access_feature;
 419         _features[1] = &_data_access_feature;
 420         _features[2] = &_make_path_feature;
 421         _features[3] = _uri_map.uri_map_feature();
 422         _features[4] = _uri_map.urid_map_feature();
 423         _features[5] = _uri_map.urid_unmap_feature();
 424         _features[6] = &_log_feature;
 425
 426         unsigned n_features = 7;
 427 #ifdef HAVE_LV2_1_2_0
 428         _features[n_features++] = &_def_state_feature;
 429 #endif
 430
 431         lv2_atom_forge_init(&_impl->forge, _uri_map.urid_map());
 432         lv2_atom_forge_init(&_impl->ui_forge, _uri_map.urid_map());
 433
 434 #ifdef LV2_EXTENDED
 435         _impl->queue_draw = (LV2_Inline_Display*)
 436                 malloc (sizeof(LV2_Inline_Display));
 437         _impl->queue_draw->handle     = this;
 438         _impl->queue_draw->queue_draw = queue_draw;
 439
 440         _queue_draw_feature.URI  = LV2_INLINEDISPLAY__queue_draw;
 441         _queue_draw_feature.data = _impl->queue_draw;
 442         _features[n_features++]  = &_queue_draw_feature;
 443
 444         _impl->midnam = (LV2_Midnam*)
 445                 malloc (sizeof(LV2_Midnam));
 446         _impl->midnam->handle = this;
 447         _impl->midnam->update = midnam_update;
 448
 449         _midnam_feature.URI  = LV2_MIDNAM__update;
 450         _midnam_feature.data = _impl->midnam;
 451         _features[n_features++]  = &_midnam_feature;
 452 #endif
 453
 454 #ifdef HAVE_LV2_1_2_0
 455         LV2_URID atom_Int = _uri_map.uri_to_id(LV2_ATOM__Int);
 456         static const int32_t _min_block_length = 1;   // may happen during split-cycles
 457         static const int32_t _max_block_length = 8192; // max possible (with all engines and during export)
 458         /* Consider updating max-block-size whenever the buffersize changes.
 459          * It requires re-instantiating the plugin (which is a non-realtime operation),
 460          * so it should be done lightly and only for plugins that require it.
 461          *
 462          * given that the block-size can change at any time (split-cycles) ardour currently
 463          * does not support plugins that require bufz_fixedBlockLength.
 464          */
 465         LV2_Options_Option options[] = {
 466                 { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id(LV2_BUF_SIZE__minBlockLength),
 467                   sizeof(int32_t), atom_Int, &_min_block_length },
 468                 { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id(LV2_BUF_SIZE__maxBlockLength),
 469                   sizeof(int32_t), atom_Int, &_max_block_length },
 470                 { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id(LV2_BUF_SIZE__sequenceSize),
 471                   sizeof(int32_t), atom_Int, &_seq_size },
 472                 { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://lv2plug.in/ns/ext/buf-size#nominalBlockLength"),
 473                   sizeof(int32_t), atom_Int, &_impl->block_length },
 474                 { LV2_OPTIONS_INSTANCE, 0, 0, 0, 0, NULL }
 475         };
 476
 477         _impl->options = (LV2_Options_Option*) malloc (sizeof (options));
 478         memcpy ((void*) _impl->options, (void*) options, sizeof (options));
 479
 480         _options_feature.URI    = LV2_OPTIONS__options;
 481         _options_feature.data   = _impl->options;
 482         _features[n_features++] = &_options_feature;
 483 #endif
 484
 485         LV2_State_Make_Path* make_path = (LV2_State_Make_Path*)malloc(
 486                 sizeof(LV2_State_Make_Path));
 487         make_path->handle = this;
 488         make_path->path = &lv2_state_make_path;
 489         _make_path_feature.data = make_path;
 490
 491         LV2_Log_Log* log = (LV2_Log_Log*)malloc(sizeof(LV2_Log_Log));
 492         log->handle  = this;
 493         log->printf  = &log_printf;
 494         log->vprintf = &log_vprintf;
 495         _log_feature.data = log;
 496
 497         const size_t ring_size = _session.engine().raw_buffer_size(DataType::MIDI) * NBUFS;
 498         LilvNode* worker_schedule = lilv_new_uri(_world.world, LV2_WORKER__schedule);
 499         if (lilv_plugin_has_feature(plugin, worker_schedule)) {
 500                 LV2_Worker_Schedule* schedule = (LV2_Worker_Schedule*)malloc(
 501                         sizeof(LV2_Worker_Schedule));
 502                 _worker                     = new Worker(this, ring_size);
 503                 schedule->handle            = _worker;
 504                 schedule->schedule_work     = work_schedule;
 505                 _work_schedule_feature.data = schedule;
 506                 _features[n_features++]     = &_work_schedule_feature;
 507         }
 508         lilv_node_free(worker_schedule);
 509
 510         if (_has_state_interface) {
 511                 // Create a non-threaded worker for use by state restore
 512                 _state_worker = new Worker(this, ring_size, false);
 513         }
 514
 515         _impl->instance = lilv_plugin_instantiate(plugin, rate, _features);
 516         _impl->name     = lilv_plugin_get_name(plugin);
 517         _impl->author   = lilv_plugin_get_author_name(plugin);
 518
 519         if (_impl->instance == 0) {
 520                 error << _("LV2: Failed to instantiate plugin ") << uri() << endmsg;
 521                 throw failed_constructor();
 522         }
 523
 524         _instance_access_feature.data              = (void*)_impl->instance->lv2_handle;
 525         _data_access_extension_data.extension_data = _impl->instance->lv2_descriptor->extension_data;
 526         _data_access_feature.data                  = &_data_access_extension_data;
 527
 528         LilvNode* worker_iface_uri = lilv_new_uri(_world.world, LV2_WORKER__interface);
 529         if (lilv_plugin_has_extension_data(plugin, worker_iface_uri)) {
 530                 _impl->work_iface = (const LV2_Worker_Interface*)extension_data(
 531                         LV2_WORKER__interface);
 532         }
 533         lilv_node_free(worker_iface_uri);
 534
 535
 536 #ifdef HAVE_LV2_1_2_0
 537         LilvNode* options_iface_uri = lilv_new_uri(_world.world, LV2_OPTIONS__interface);
 538         if (lilv_plugin_has_extension_data(plugin, options_iface_uri)) {
 539                 _impl->opts_iface = (const LV2_Options_Interface*)extension_data(
 540                         LV2_OPTIONS__interface);
 541         }
 542         lilv_node_free(options_iface_uri);
 543 #endif
 544
 545 #ifdef LV2_EXTENDED
 546         _display_interface = (const LV2_Inline_Display_Interface*)
 547                 extension_data (LV2_INLINEDISPLAY__interface);
 548
 549         _midname_interface = (const LV2_Midnam_Interface*)
 550                 extension_data (LV2_MIDNAM__interface);
 551         if (_midname_interface) {
 552                 read_midnam ();
 553         }
 554 #endif
 555
 556         if (lilv_plugin_has_feature(plugin, _world.lv2_inPlaceBroken)) {
 557                 error << string_compose(
 558                     _("LV2: \"%1\" cannot be used, since it cannot do inplace processing."),
 559                     lilv_node_as_string(_impl->name)) << endmsg;
 560                 lilv_node_free(_impl->name);
 561                 lilv_node_free(_impl->author);
 562                 throw failed_constructor();
 563         }
 564
 565 #ifdef HAVE_LV2_1_2_0
 566         LilvNodes *required_features = lilv_plugin_get_required_features (plugin);
 567         if (lilv_nodes_contains (required_features, _world.bufz_powerOf2BlockLength) ||
 568                         lilv_nodes_contains (required_features, _world.bufz_fixedBlockLength)
 569            ) {
 570                 error << string_compose(
 571                     _("LV2: \"%1\" buffer-size requirements cannot be satisfied."),
 572                     lilv_node_as_string(_impl->name)) << endmsg;
 573                 lilv_node_free(_impl->name);
 574                 lilv_node_free(_impl->author);
 575                 lilv_nodes_free(required_features);
 576                 throw failed_constructor();
 577         }
 578         lilv_nodes_free(required_features);
 579 #endif
 580
 581         LilvNodes* optional_features = lilv_plugin_get_optional_features (plugin);
 582 #ifdef HAVE_LV2_1_2_0
 583         if (lilv_nodes_contains (optional_features, _world.bufz_coarseBlockLength)) {
 584                 _no_sample_accurate_ctrl = true;
 585         }
 586 #endif
 587 #ifdef LV2_EXTENDED
 588         if (lilv_nodes_contains (optional_features, _world.lv2_noSampleAccurateCtrl)) {
 589                 /* deprecated 2016-Sep-18 in favor of bufz_coarseBlockLength */
 590                 _no_sample_accurate_ctrl = true;
 591         }
 592         if (lilv_nodes_contains (optional_features, _world.auto_can_write_automatation)) {
 593                 _can_write_automation = true;
 594         }
 595         lilv_nodes_free(optional_features);
 596 #endif
 597
 598 #ifdef HAVE_LILV_0_16_0
 599         // Load default state
 600         if (_worker) {
 601                 /* immediately schedule any work,
 602                  * so that state restore later will not find a busy
 603                  * worker.  latency_compute_run() flushes any replies
 604                  */
 605                 _worker->set_synchronous(true);
 606         }
 607         LilvState* state = lilv_state_new_from_world(
 608                 _world.world, _uri_map.urid_map(), lilv_plugin_get_uri(_impl->plugin));
 609         if (state && _has_state_interface) {
 610                 lilv_state_restore(state, _impl->instance, NULL, NULL, 0, NULL);
 611         }
 612         lilv_state_free(state);
 613 #endif
 614
 615         _sample_rate = rate;
 616
 617         const uint32_t num_ports = this->num_ports();
 618         for (uint32_t i = 0; i < num_ports; ++i) {
 619                 const LilvPort* port  = lilv_plugin_get_port_by_index(_impl->plugin, i);
 620                 PortFlags       flags = 0;
 621                 size_t          minimumSize = 0;
 622
 623                 if (lilv_port_is_a(_impl->plugin, port, _world.lv2_OutputPort)) {
 624                         flags |= PORT_OUTPUT;
 625                 } else if (lilv_port_is_a(_impl->plugin, port, _world.lv2_InputPort)) {
 626                         flags |= PORT_INPUT;
 627                 } else {
 628                         error << string_compose(
 629                                 "LV2: \"%1\" port %2 is neither input nor output",
 630                                 lilv_node_as_string(_impl->name), i) << endmsg;
 631                         throw failed_constructor();
 632                 }
 633
 634                 if (lilv_port_is_a(_impl->plugin, port, _world.lv2_ControlPort)) {
 635                         flags |= PORT_CONTROL;
 636                 } else if (lilv_port_is_a(_impl->plugin, port, _world.lv2_AudioPort)) {
 637                         flags |= PORT_AUDIO;
 638                 } else if (lilv_port_is_a(_impl->plugin, port, _world.ev_EventPort)) {
 639                         flags |= PORT_EVENT;
 640                         flags |= PORT_MIDI;  // We assume old event API ports are for MIDI
 641                 } else if (lilv_port_is_a(_impl->plugin, port, _world.atom_AtomPort)) {
 642                         LilvNodes* buffer_types = lilv_port_get_value(
 643                                 _impl->plugin, port, _world.atom_bufferType);
 644                         LilvNodes* atom_supports = lilv_port_get_value(
 645                                 _impl->plugin, port, _world.atom_supports);
 646
 647                         if (lilv_nodes_contains(buffer_types, _world.atom_Sequence)) {
 648                                 flags |= PORT_SEQUENCE;
 649                                 if (lilv_nodes_contains(atom_supports, _world.midi_MidiEvent)) {
 650                                         flags |= PORT_MIDI;
 651                                 }
 652                                 if (lilv_nodes_contains(atom_supports, _world.time_Position)) {
 653                                         flags |= PORT_POSITION;
 654                                 }
 655 #ifdef LV2_EXTENDED
 656                                 if (lilv_nodes_contains(atom_supports, _world.auto_automation_control)) {
 657                                         flags |= PORT_AUTOCTRL;
 658                                 }
 659 #endif
 660                                 if (lilv_nodes_contains(atom_supports, _world.patch_Message)) {
 661                                         flags |= PORT_PATCHMSG;
 662                                         if (flags & PORT_INPUT) {
 663                                                 _patch_port_in_index = i;
 664                                         } else {
 665                                                 _patch_port_out_index = i;
 666                                         }
 667                                 }
 668                         }
 669                         LilvNodes* min_size_v = lilv_port_get_value(_impl->plugin, port, _world.rsz_minimumSize);
 670                         LilvNode* min_size = min_size_v ? lilv_nodes_get_first(min_size_v) : NULL;
 671                         if (min_size && lilv_node_is_int(min_size)) {
 672                                 minimumSize = lilv_node_as_int(min_size);
 673                         }
 674                         lilv_nodes_free(min_size_v);
 675                         lilv_nodes_free(buffer_types);
 676                         lilv_nodes_free(atom_supports);
 677                 } else {
 678                         error << string_compose(
 679                                 "LV2: \"%1\" port %2 has no known data type",
 680                                 lilv_node_as_string(_impl->name), i) << endmsg;
 681                         throw failed_constructor();
 682                 }
 683
 684                 if ((flags & PORT_INPUT) && (flags & PORT_CONTROL)) {
 685                         if (lilv_port_has_property(_impl->plugin, port, _world.ext_causesArtifacts)) {
 686                                 flags |= PORT_NOAUTO;
 687                         }
 688                         if (lilv_port_has_property(_impl->plugin, port, _world.ext_notAutomatic)) {
 689                                 flags |= PORT_NOAUTO;
 690                         }
 691                         if (lilv_port_has_property(_impl->plugin, port, _world.ext_expensive)) {
 692                                 flags |= PORT_NOAUTO;
 693                         }
 694                 }
 695 #ifdef LV2_EXTENDED
 696                 if (lilv_port_has_property(_impl->plugin, port, _world.auto_automation_controlled)) {
 697                         if ((flags & PORT_INPUT) && (flags & PORT_CONTROL)) {
 698                                 flags |= PORT_CTRLED;
 699                         }
 700                 }
 701                 if (lilv_port_has_property(_impl->plugin, port, _world.auto_automation_controller)) {
 702                         if ((flags & PORT_INPUT) && (flags & PORT_CONTROL)) {
 703                                 flags |= PORT_CTRLER;
 704                         }
 705                 }
 706 #endif
 707
 708                 _port_flags.push_back(flags);
 709                 _port_minimumSize.push_back(minimumSize);
 710                 DEBUG_TRACE(DEBUG::LV2, string_compose("port %1 buffer %2 bytes\n", i, minimumSize));
 711         }
 712
 713         _control_data = new float[num_ports];
 714         _shadow_data  = new float[num_ports];
 715         _defaults     = new float[num_ports];
 716         _ev_buffers   = new LV2_Evbuf*[num_ports];
 717         memset(_ev_buffers, 0, sizeof(LV2_Evbuf*) * num_ports);
 718
 719         const bool     latent        = lilv_plugin_has_latency(plugin);
 720         const uint32_t latency_index = (latent)
 721                 ? lilv_plugin_get_latency_port_index(plugin)
 722                 : 0;
 723
 724         // Build an array of pointers to special parameter buffers
 725         void*** params = new void**[num_ports];
 726         for (uint32_t i = 0; i < num_ports; ++i) {
 727                 params[i] = NULL;
 728         }
 729         _impl->designated_input (LV2_TIME__beatsPerMinute, params, (void**)&_bpm_control_port);
 730         _impl->designated_input (LV2_CORE__freeWheeling, params, (void**)&_freewheel_control_port);
 731
 732         for (uint32_t i = 0; i < num_ports; ++i) {
 733                 const LilvPort* port = lilv_plugin_get_port_by_index(plugin, i);
 734                 const LilvNode* sym  = lilv_port_get_symbol(plugin, port);
 735
 736                 // Store index in map so we can look up index by symbol
 737                 _port_indices.insert(std::make_pair(lilv_node_as_string(sym), i));
 738
 739                 // Get range and default value if applicable
 740                 if (parameter_is_control(i)) {
 741                         LilvNode* def;
 742                         lilv_port_get_range(plugin, port, &def, NULL, NULL);
 743                         _defaults[i] = def ? lilv_node_as_float(def) : 0.0f;
 744                         if (lilv_port_has_property (plugin, port, _world.lv2_sampleRate)) {
 745                                 _defaults[i] *= _session.frame_rate ();
 746                         }
 747                         lilv_node_free(def);
 748
 749                         lilv_instance_connect_port(_impl->instance, i, &_control_data[i]);
 750
 751                         if (latent && i == latency_index) {
 752                                 LilvNode *max;
 753                                 lilv_port_get_range(_impl->plugin, port, NULL, NULL, &max);
 754                                 _max_latency = max ? lilv_node_as_float(max) : .02 * _sample_rate;
 755                                 _latency_control_port  = &_control_data[i];
 756                                 *_latency_control_port = 0;
 757                         }
 758
 759                         if (parameter_is_input(i)) {
 760                                 _shadow_data[i] = default_value(i);
 761                                 if (params[i]) {
 762                                         *params[i] = (void*)&_shadow_data[i];
 763                                 }
 764                         }
 765                 } else {
 766                         _defaults[i] = 0.0f;
 767                 }
 768         }
 769
 770         delete[] params;
 771
 772         LilvUIs* uis = lilv_plugin_get_uis(plugin);
 773         if (lilv_uis_size(uis) > 0) {
 774 #ifdef HAVE_SUIL
 775                 // Look for embeddable UI
 776                 LILV_FOREACH(uis, u, uis) {
 777                         const LilvUI*   this_ui      = lilv_uis_get(uis, u);
 778                         const LilvNode* this_ui_type = NULL;
 779                         if (lilv_ui_is_supported(this_ui,
 780                                                  suil_ui_supported,
 781                                                  _world.ui_GtkUI,
 782                                                  &this_ui_type)) {
 783                                 // TODO: Multiple UI support
 784                                 _impl->ui      = this_ui;
 785                                 _impl->ui_type = this_ui_type;
 786                                 break;
 787                         }
 788                 }
 789 #else
 790                 // Look for Gtk native UI
 791                 LILV_FOREACH(uis, i, uis) {
 792                         const LilvUI* ui = lilv_uis_get(uis, i);
 793                         if (lilv_ui_is_a(ui, _world.ui_GtkUI)) {
 794                                 _impl->ui      = ui;
 795                                 _impl->ui_type = _world.ui_GtkUI;
 796                                 break;
 797                         }
 798                 }
 799 #endif
 800
 801                 // If Gtk UI is not available, try to find external UI
 802                 if (!_impl->ui) {
 803                         LILV_FOREACH(uis, i, uis) {
 804                                 const LilvUI* ui = lilv_uis_get(uis, i);
 805                                 if (lilv_ui_is_a(ui, _world.ui_externalkx)) {
 806                                         _impl->ui      = ui;
 807                                         _impl->ui_type = _world.ui_external;
 808                                         break;
 809                                 }
 810                                 if (lilv_ui_is_a(ui, _world.ui_external)) {
 811                                         _impl->ui      = ui;
 812                                         _impl->ui_type = _world.ui_external;
 813                                 }
 814                         }
 815                 }
 816         }
 817
 818         load_supported_properties(_property_descriptors);
 819         allocate_atom_event_buffers();
 820         latency_compute_run();
 821 }
 822
 823 int
 824 LV2Plugin::set_block_size (pframes_t nframes)
 825 {
 826 #ifdef HAVE_LV2_1_2_0
 827         if (_impl->opts_iface) {
 828                 LV2_URID atom_Int = _uri_map.uri_to_id(LV2_ATOM__Int);
 829                 _impl->block_length = nframes;
 830                 LV2_Options_Option block_size_option = {
 831                         LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id ("http://lv2plug.in/ns/ext/buf-size#nominalBlockLength"),
 832                         sizeof(int32_t), atom_Int, (void*)&_impl->block_length
 833                 };
 834                 _impl->opts_iface->set (_impl->instance->lv2_handle, &block_size_option);
 835         }
 836 #endif
 837         return 0;
 838 }
 839
 840 bool
 841 LV2Plugin::requires_fixed_sized_buffers () const
 842 {
 843         /* This controls if Ardour will split the plugin's run()
 844          * on automation events in order to pass sample-accurate automation
 845          * via standard control-ports.
 846          *
 847          * When returning true Ardour will *not* sub-divide the process-cycle.
 848          * Automation events that happen between cycle-start and cycle-end will be
 849          * ignored (ctrl values are interpolated to cycle-start).
 850          * NB. Atom Sequences are still sample accurate.
 851          *
 852          * Note: This does not guarantee a fixed block-size.
 853          * e.g The process cycle may be split when looping, also
 854          * the period-size may change any time: see set_block_size()
 855          */
 856         if (get_info()->n_inputs.n_midi() > 0) {
 857                 /* we don't yet implement midi buffer offsets (for split cycles).
 858                  * Also connect_and_run() also uses _session.transport_frame() directly
 859                  * (for BBT) which is not offset for plugin cycle split.
 860                  */
 861                 return true;
 862         }
 863         return _no_sample_accurate_ctrl;
 864 }
 865
 866 LV2Plugin::~LV2Plugin ()
 867 {
 868         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 destroy\n", name()));
 869
 870         deactivate();
 871         cleanup();
 872
 873 #ifdef LV2_EXTENDED
 874         if (has_midnam ()) {
 875                 std::stringstream ss;
 876                 ss << (void*)this;
 877                 ss << unique_id();
 878                 MIDI::Name::MidiPatchManager::instance().remove_custom_midnam (ss.str());
 879         }
 880 #endif
 881
 882         lilv_instance_free(_impl->instance);
 883         lilv_state_free(_impl->state);
 884         lilv_node_free(_impl->name);
 885         lilv_node_free(_impl->author);
 886 #ifdef HAVE_LV2_1_2_0
 887         free(_impl->options);
 888 #endif
 889 #ifdef LV2_EXTENDED
 890         free(_impl->queue_draw);
 891         free(_impl->midnam);
 892 #endif
 893
 894         free(_features);
 895         free(_log_feature.data);
 896         free(_make_path_feature.data);
 897         free(_work_schedule_feature.data);
 898
 899         delete _to_ui;
 900         delete _from_ui;
 901         delete _worker;
 902         delete _state_worker;
 903
 904         if (_atom_ev_buffers) {
 905                 LV2_Evbuf**  b = _atom_ev_buffers;
 906                 while (*b) {
 907                         free(*b);
 908                         b++;
 909                 }
 910                 free(_atom_ev_buffers);
 911         }
 912
 913         delete [] _control_data;
 914         delete [] _shadow_data;
 915         delete [] _defaults;
 916         delete [] _ev_buffers;
 917         delete _impl;
 918 }
 919
 920 bool
 921 LV2Plugin::is_external_ui() const
 922 {
 923         if (!_impl->ui) {
 924                 return false;
 925         }
 926         return lilv_ui_is_a(_impl->ui, _world.ui_external) || lilv_ui_is_a(_impl->ui, _world.ui_externalkx);
 927 }
 928
 929 bool
 930 LV2Plugin::is_external_kx() const
 931 {
 932         if (!_impl->ui) {
 933                 return false;
 934         }
 935         return lilv_ui_is_a(_impl->ui, _world.ui_externalkx);
 936 }
 937
 938 bool
 939 LV2Plugin::ui_is_resizable () const
 940 {
 941         const LilvNode* s   = lilv_ui_get_uri(_impl->ui);
 942         LilvNode*       p   = lilv_new_uri(_world.world, LV2_CORE__optionalFeature);
 943         LilvNode*       fs  = lilv_new_uri(_world.world, LV2_UI__fixedSize);
 944         LilvNode*       nrs = lilv_new_uri(_world.world, LV2_UI__noUserResize);
 945
 946         LilvNodes* fs_matches = lilv_world_find_nodes(_world.world, s, p, fs);
 947         LilvNodes* nrs_matches = lilv_world_find_nodes(_world.world, s, p, nrs);
 948
 949         lilv_nodes_free(nrs_matches);
 950         lilv_nodes_free(fs_matches);
 951         lilv_node_free(nrs);
 952         lilv_node_free(fs);
 953         lilv_node_free(p);
 954
 955         return !fs_matches && !nrs_matches;
 956 }
 957
 958 #ifdef LV2_EXTENDED
 959 bool
 960 LV2Plugin::has_inline_display () {
 961         return _display_interface ? true : false;
 962 }
 963
 964 Plugin::Display_Image_Surface*
 965 LV2Plugin::render_inline_display (uint32_t w, uint32_t h) {
 966         if (_display_interface) {
 967                 /* Plugin::Display_Image_Surface is identical to
 968                  * LV2_Inline_Display_Image_Surface */
 969                 return (Plugin::Display_Image_Surface*) _display_interface->render ((void*)_impl->instance->lv2_handle, w, h);
 970         }
 971         return NULL;
 972 }
 973
 974 bool
 975 LV2Plugin::has_midnam () {
 976         return _midname_interface ? true : false;
 977 }
 978
 979 bool
 980 LV2Plugin::read_midnam () {
 981         bool rv = false;
 982         if (!_midname_interface) {
 983                 return rv;
 984         }
 985         char* midnam = _midname_interface->midnam ((void*)_impl->instance->lv2_handle);
 986         if (midnam) {
 987                 std::stringstream ss;
 988                 ss << (void*)this;
 989                 ss << unique_id();
 990                 rv = MIDI::Name::MidiPatchManager::instance().update_custom_midnam (ss.str(), midnam);
 991         }
 992 #ifndef NDEBUG
 993         if (rv) {
 994                 info << string_compose(_("LV2: update midnam for plugin '%1'"), name ()) << endmsg;
 995         } else {
 996                 warning << string_compose(_("LV2: Failed to parse midnam of plugin '%1'"), name ()) << endmsg;
 997         }
 998 #endif
 999         _midname_interface->free (midnam);
1000         return rv;
1001 }
1002
1003 std::string
1004 LV2Plugin::midnam_model () {
1005         std::string rv;
1006         if (!_midname_interface) {
1007                 return rv;
1008         }
1009         char* model = _midname_interface->model ((void*)_impl->instance->lv2_handle);
1010         if (model) {
1011                 rv = model;
1012         }
1013         _midname_interface->free (model);
1014         return rv;
1015 }
1016 #endif
1017
1018 string
1019 LV2Plugin::unique_id() const
1020 {
1021         return lilv_node_as_uri(lilv_plugin_get_uri(_impl->plugin));
1022 }
1023
1024 const char*
1025 LV2Plugin::uri() const
1026 {
1027         return lilv_node_as_uri(lilv_plugin_get_uri(_impl->plugin));
1028 }
1029
1030 const char*
1031 LV2Plugin::label() const
1032 {
1033         return lilv_node_as_string(_impl->name);
1034 }
1035
1036 const char*
1037 LV2Plugin::name() const
1038 {
1039         return lilv_node_as_string(_impl->name);
1040 }
1041
1042 const char*
1043 LV2Plugin::maker() const
1044 {
1045         return _impl->author ? lilv_node_as_string (_impl->author) : "Unknown";
1046 }
1047
1048 uint32_t
1049 LV2Plugin::num_ports() const
1050 {
1051         return lilv_plugin_get_num_ports(_impl->plugin);
1052 }
1053
1054 uint32_t
1055 LV2Plugin::parameter_count() const
1056 {
1057         return lilv_plugin_get_num_ports(_impl->plugin);
1058 }
1059
1060 float
1061 LV2Plugin::default_value(uint32_t port)
1062 {
1063         return _defaults[port];
1064 }
1065
1066 const char*
1067 LV2Plugin::port_symbol(uint32_t index) const
1068 {
1069         const LilvPort* port = lilv_plugin_get_port_by_index(_impl->plugin, index);
1070         if (!port) {
1071                 error << name() << ": Invalid port index " << index << endmsg;
1072         }
1073
1074         const LilvNode* sym = lilv_port_get_symbol(_impl->plugin, port);
1075         return lilv_node_as_string(sym);
1076 }
1077
1078 uint32_t
1079 LV2Plugin::port_index (const char* symbol) const
1080 {
1081         const map<string, uint32_t>::const_iterator i = _port_indices.find(symbol);
1082         if (i != _port_indices.end()) {
1083                 return  i->second;
1084         } else {
1085                 warning << string_compose(_("LV2: Unknown port %1"), symbol) << endmsg;
1086                 return (uint32_t)-1;
1087         }
1088 }
1089
1090 void
1091 LV2Plugin::set_parameter(uint32_t which, float val)
1092 {
1093         DEBUG_TRACE(DEBUG::LV2, string_compose(
1094                             "%1 set parameter %2 to %3\n", name(), which, val));
1095
1096         if (which < lilv_plugin_get_num_ports(_impl->plugin)) {
1097                 if (get_parameter (which) == val) {
1098                         return;
1099                 }
1100
1101                 _shadow_data[which] = val;
1102         } else {
1103                 warning << string_compose(
1104                     _("Illegal parameter number used with plugin \"%1\". "
1105                       "This is a bug in either %2 or the LV2 plugin <%3>"),
1106                     name(), PROGRAM_NAME, unique_id()) << endmsg;
1107         }
1108
1109         Plugin::set_parameter(which, val);
1110 }
1111
1112 float
1113 LV2Plugin::get_parameter(uint32_t which) const
1114 {
1115         if (parameter_is_input(which)) {
1116                 return (float)_shadow_data[which];
1117         } else {
1118                 return (float)_control_data[which];
1119         }
1120         return 0.0f;
1121 }
1122
1123 std::string
1124 LV2Plugin::get_docs() const
1125 {
1126         LilvNodes* comments = lilv_plugin_get_value(_impl->plugin, _world.rdfs_comment);
1127         if (comments) {
1128                 const std::string docs(lilv_node_as_string(lilv_nodes_get_first(comments)));
1129                 lilv_nodes_free(comments);
1130                 return docs;
1131         }
1132
1133         return "";
1134 }
1135
1136 std::string
1137 LV2Plugin::get_parameter_docs(uint32_t which) const
1138 {
1139         LilvNodes* comments = lilv_port_get_value(
1140                 _impl->plugin,
1141                 lilv_plugin_get_port_by_index(_impl->plugin, which),
1142                 _world.rdfs_comment);
1143
1144         if (comments) {
1145                 const std::string docs(lilv_node_as_string(lilv_nodes_get_first(comments)));
1146                 lilv_nodes_free(comments);
1147                 return docs;
1148         }
1149
1150         return "";
1151 }
1152
1153 bool
1154 LV2Plugin::get_layout (uint32_t which, UILayoutHint& h) const
1155 {
1156         /// TODO lookup port-properties
1157         if (unique_id () != "urn:ardour:a-eq") {
1158                 return false;
1159         }
1160         h.knob = true;
1161         switch (which) {
1162                 case  0: h.x0 = 0; h.x1 = 1; h.y0 = 2; h.y1 = 3; break; // Frequency L
1163                 case  1: h.x0 = 0; h.x1 = 1; h.y0 = 0; h.y1 = 1; break; // Gain L
1164                 case 17: h.x0 = 0; h.x1 = 1; h.y0 = 5; h.y1 = 6; break; // enable L
1165
1166                 case  2: h.x0 = 1; h.x1 = 3; h.y0 = 2; h.y1 = 3; break; // Frequency 1
1167                 case  3: h.x0 = 1; h.x1 = 3; h.y0 = 0; h.y1 = 1; break; // Gain 1
1168                 case  4: h.x0 = 1; h.x1 = 3; h.y0 = 1; h.y1 = 2; break; // Bandwidth 1
1169                 case 18: h.x0 = 1; h.x1 = 4; h.y0 = 5; h.y1 = 6; break; // enable 1
1170
1171                 case  5: h.x0 = 4; h.x1 = 6; h.y0 = 2; h.y1 = 3; break; // Frequency 2
1172                 case  6: h.x0 = 4; h.x1 = 6; h.y0 = 0; h.y1 = 1; break; // Gain 2
1173                 case  7: h.x0 = 4; h.x1 = 6; h.y0 = 1; h.y1 = 2; break; // Bandwidth 2
1174                 case 19: h.x0 = 4; h.x1 = 7; h.y0 = 5; h.y1 = 6; break; // enable 2
1175
1176                 case  8: h.x0 = 7; h.x1 =  9; h.y0 = 2; h.y1 = 3; break; // Frequency 3
1177                 case  9: h.x0 = 7; h.x1 =  9; h.y0 = 0; h.y1 = 1; break; // Gain 3
1178                 case 10: h.x0 = 7; h.x1 =  9; h.y0 = 1; h.y1 = 2; break; // Bandwidth 3
1179                 case 20: h.x0 = 7; h.x1 = 10; h.y0 = 5; h.y1 = 6; break; // enable 3
1180
1181                 case 11: h.x0 = 10; h.x1 = 12; h.y0 = 2; h.y1 = 3; break; // Frequency 4
1182                 case 12: h.x0 = 10; h.x1 = 12; h.y0 = 0; h.y1 = 1; break; // Gain 4
1183                 case 13: h.x0 = 10; h.x1 = 12; h.y0 = 1; h.y1 = 2; break; // Bandwidth 4
1184                 case 21: h.x0 = 10; h.x1 = 13; h.y0 = 5; h.y1 = 6; break; // enable 4
1185
1186                 case 14: h.x0 = 13; h.x1 = 14; h.y0 = 2; h.y1 = 3; break; // Frequency H
1187                 case 15: h.x0 = 13; h.x1 = 14; h.y0 = 0; h.y1 = 1; break; // Gain H
1188                 case 22: h.x0 = 13; h.x1 = 14; h.y0 = 5; h.y1 = 6; break; // enable H
1189
1190                 case 16: h.x0 = 14; h.x1 = 15; h.y0 = 1; h.y1 = 3; break; // Master Gain
1191                 case 23: h.x0 = 14; h.x1 = 15; h.y0 = 5; h.y1 = 6; break; // Master Enable
1192                 default:
1193                         return false;
1194         }
1195         return true;
1196 }
1197
1198 uint32_t
1199 LV2Plugin::nth_parameter(uint32_t n, bool& ok) const
1200 {
1201         ok = false;
1202         for (uint32_t c = 0, x = 0; x < lilv_plugin_get_num_ports(_impl->plugin); ++x) {
1203                 if (parameter_is_control(x)) {
1204                         if (c++ == n) {
1205                                 ok = true;
1206                                 return x;
1207                         }
1208                 }
1209         }
1210
1211         return 0;
1212 }
1213
1214 const void*
1215 LV2Plugin::extension_data(const char* uri) const
1216 {
1217         return lilv_instance_get_extension_data(_impl->instance, uri);
1218 }
1219
1220 const void*
1221 LV2Plugin::c_plugin()
1222 {
1223         return _impl->plugin;
1224 }
1225
1226 const void*
1227 LV2Plugin::c_ui()
1228 {
1229         return (const void*)_impl->ui;
1230 }
1231
1232 const void*
1233 LV2Plugin::c_ui_type()
1234 {
1235         return (const void*)_impl->ui_type;
1236 }
1237
1238 /** Directory for all plugin state. */
1239 const std::string
1240 LV2Plugin::plugin_dir() const
1241 {
1242         if (!_plugin_state_dir.empty ()){
1243                 return Glib::build_filename(_plugin_state_dir, _insert_id.to_s());
1244         } else {
1245                 return Glib::build_filename(_session.plugins_dir(), _insert_id.to_s());
1246         }
1247 }
1248
1249 /** Directory for files created by the plugin (except during save). */
1250 const std::string
1251 LV2Plugin::scratch_dir() const
1252 {
1253         return Glib::build_filename(plugin_dir(), "scratch");
1254 }
1255
1256 /** Directory for snapshots of files in the scratch directory. */
1257 const std::string
1258 LV2Plugin::file_dir() const
1259 {
1260         return Glib::build_filename(plugin_dir(), "files");
1261 }
1262
1263 /** Directory to save state snapshot version @c num into. */
1264 const std::string
1265 LV2Plugin::state_dir(unsigned num) const
1266 {
1267         return Glib::build_filename(plugin_dir(), string("state") + PBD::to_string (num));
1268 }
1269
1270 /** Implementation of state:makePath for files created at instantiation time.
1271  * Note this is not used for files created at save time (Lilv deals with that).
1272  */
1273 char*
1274 LV2Plugin::lv2_state_make_path(LV2_State_Make_Path_Handle handle,
1275                                const char*                path)
1276 {
1277         LV2Plugin* me = (LV2Plugin*)handle;
1278         if (me->_insert_id == PBD::ID("0")) {
1279                 warning << string_compose(
1280                         "File path \"%1\" requested but LV2 %2 has no insert ID",
1281                         path, me->name()) << endmsg;
1282                 return g_strdup(path);
1283         }
1284
1285         const std::string abs_path = Glib::build_filename(me->scratch_dir(), path);
1286         const std::string dirname  = Glib::path_get_dirname(abs_path);
1287         g_mkdir_with_parents(dirname.c_str(), 0744);
1288
1289         DEBUG_TRACE(DEBUG::LV2, string_compose("new file path %1 => %2\n",
1290                                                path, abs_path));
1291
1292         return g_strndup(abs_path.c_str(), abs_path.length());
1293 }
1294
1295 void
1296 LV2Plugin::add_state(XMLNode* root) const
1297 {
1298         assert(_insert_id != PBD::ID("0"));
1299
1300         XMLNode*    child;
1301         LocaleGuard lg;
1302
1303         for (uint32_t i = 0; i < parameter_count(); ++i) {
1304                 if (parameter_is_input(i) && parameter_is_control(i)) {
1305                         child = new XMLNode("Port");
1306                         child->set_property("symbol", port_symbol(i));
1307                         child->set_property("value", _shadow_data[i]);
1308                         root->add_child_nocopy(*child);
1309                 }
1310         }
1311
1312         if (!_plugin_state_dir.empty()) {
1313                 root->set_property("template-dir", _plugin_state_dir);
1314         }
1315
1316         if (_has_state_interface) {
1317                 // Provisionally increment state version and create directory
1318                 const std::string new_dir = state_dir(++_state_version);
1319                 // and keep track of it (for templates & archive)
1320                 unsigned int saved_state = _state_version;;
1321                 g_mkdir_with_parents(new_dir.c_str(), 0744);
1322
1323                 LilvState* state = lilv_state_new_from_instance(
1324                         _impl->plugin,
1325                         _impl->instance,
1326                         _uri_map.urid_map(),
1327                         scratch_dir().c_str(),
1328                         file_dir().c_str(),
1329                         _session.externals_dir().c_str(),
1330                         new_dir.c_str(),
1331                         NULL,
1332                         const_cast<LV2Plugin*>(this),
1333                         0,
1334                         NULL);
1335
1336                 if (!_plugin_state_dir.empty() || force_state_save
1337                     || !_impl->state
1338                     || !lilv_state_equals(state, _impl->state)) {
1339                         lilv_state_save(_world.world,
1340                                         _uri_map.urid_map(),
1341                                         _uri_map.urid_unmap(),
1342                                         state,
1343                                         NULL,
1344                                         new_dir.c_str(),
1345                                         "state.ttl");
1346
1347                         if (force_state_save) {
1348                                 // archive or save-as
1349                                 lilv_state_free(state);
1350                                 --_state_version;
1351                         }
1352                         else if (_plugin_state_dir.empty()) {
1353                                 // normal session save
1354                                 lilv_state_free(_impl->state);
1355                                 _impl->state = state;
1356                         } else {
1357                                 // template save (dedicated state-dir)
1358                                 lilv_state_free(state);
1359                                 --_state_version;
1360                         }
1361                 } else {
1362                         // State is identical, decrement version and nuke directory
1363                         lilv_state_free(state);
1364                         PBD::remove_directory(new_dir);
1365                         --_state_version;
1366                         saved_state = _state_version;
1367                 }
1368
1369                 root->set_property("state-dir", string("state") + PBD::to_string (saved_state));
1370         }
1371 }
1372
1373 // TODO: Once we can rely on lilv 0.16.0, lilv_world_get can replace this
1374 static LilvNode*
1375 get_value(LilvWorld* world, const LilvNode* subject, const LilvNode* predicate)
1376 {
1377         LilvNodes* vs = lilv_world_find_nodes(world, subject, predicate, NULL);
1378         if (vs) {
1379                 LilvNode* node = lilv_node_duplicate(lilv_nodes_get_first(vs));
1380                 lilv_nodes_free(vs);
1381                 return node;
1382         }
1383         return NULL;
1384 }
1385
1386 void
1387 LV2Plugin::find_presets()
1388 {
1389         LilvNode* lv2_appliesTo = lilv_new_uri(_world.world, LV2_CORE__appliesTo);
1390         LilvNode* pset_Preset   = lilv_new_uri(_world.world, LV2_PRESETS__Preset);
1391         LilvNode* rdfs_label    = lilv_new_uri(_world.world, LILV_NS_RDFS "label");
1392
1393         LilvNodes* presets = lilv_plugin_get_related(_impl->plugin, pset_Preset);
1394         LILV_FOREACH(nodes, i, presets) {
1395                 const LilvNode* preset = lilv_nodes_get(presets, i);
1396                 lilv_world_load_resource(_world.world, preset);
1397                 LilvNode* name = get_value(_world.world, preset, rdfs_label);
1398                 bool userpreset = true; // TODO
1399                 if (name) {
1400                         _presets.insert(std::make_pair(lilv_node_as_string(preset),
1401                                                        Plugin::PresetRecord(
1402                                                                lilv_node_as_string(preset),
1403                                                                lilv_node_as_string(name),
1404                                                                userpreset)));
1405                         lilv_node_free(name);
1406                 } else {
1407                         warning << string_compose(
1408                             _("Plugin \"%1\" preset \"%2\" is missing a label\n"),
1409                             lilv_node_as_string(lilv_plugin_get_uri(_impl->plugin)),
1410                             lilv_node_as_string(preset)) << endmsg;
1411                 }
1412         }
1413         lilv_nodes_free(presets);
1414
1415         lilv_node_free(rdfs_label);
1416         lilv_node_free(pset_Preset);
1417         lilv_node_free(lv2_appliesTo);
1418 }
1419
1420 static void
1421 set_port_value(const char* port_symbol,
1422                void*       user_data,
1423                const void* value,
1424                uint32_t    /*size*/,
1425                uint32_t    type)
1426 {
1427         LV2Plugin* self = (LV2Plugin*)user_data;
1428         if (type != 0 && type != URIMap::instance().urids.atom_Float) {
1429                 return;  // TODO: Support non-float ports
1430         }
1431
1432         const uint32_t port_index = self->port_index(port_symbol);
1433         if (port_index != (uint32_t)-1) {
1434                 self->set_parameter(port_index, *(const float*)value);
1435                 self->PresetPortSetValue (port_index, *(const float*)value); /* EMIT SIGNAL */
1436         }
1437 }
1438
1439 bool
1440 LV2Plugin::load_preset(PresetRecord r)
1441 {
1442         LilvWorld* world = _world.world;
1443         LilvNode*  pset  = lilv_new_uri(world, r.uri.c_str());
1444         LilvState* state = lilv_state_new_from_world(world, _uri_map.urid_map(), pset);
1445
1446         const LV2_Feature*  state_features[2]   = { NULL, NULL };
1447         LV2_Worker_Schedule schedule            = { _state_worker, work_schedule };
1448         const LV2_Feature   state_sched_feature = { LV2_WORKER__schedule, &schedule };
1449         if (_state_worker) {
1450                 state_features[0] = &state_sched_feature;
1451         }
1452
1453         if (state) {
1454                 lilv_state_restore(state, _impl->instance, set_port_value, this, 0, state_features);
1455                 lilv_state_free(state);
1456                 Plugin::load_preset(r);
1457         }
1458
1459         lilv_node_free(pset);
1460         return state;
1461 }
1462
1463 const void*
1464 ARDOUR::lv2plugin_get_port_value(const char* port_symbol,
1465                                  void*       user_data,
1466                                  uint32_t*   size,
1467                                  uint32_t*   type)
1468 {
1469         LV2Plugin *plugin = (LV2Plugin *) user_data;
1470
1471         uint32_t index = plugin->port_index(port_symbol);
1472         if (index != (uint32_t) -1) {
1473                 if (plugin->parameter_is_input(index) && plugin->parameter_is_control(index)) {
1474                         float *value;
1475                         *size = sizeof(float);
1476                         *type = plugin->_uri_map.uri_to_id(LV2_ATOM__Float);
1477                         value = &plugin->_shadow_data[index];
1478
1479                         return value;
1480                 }
1481         }
1482
1483         *size = *type = 0;
1484         return NULL;
1485 }
1486
1487
1488 std::string
1489 LV2Plugin::do_save_preset(string name)
1490 {
1491         LilvNode*    plug_name = lilv_plugin_get_name(_impl->plugin);
1492         const string prefix    = legalize_for_uri(lilv_node_as_string(plug_name));
1493         const string base_name = legalize_for_uri(name);
1494         const string file_name = base_name + ".ttl";
1495         const string bundle    = Glib::build_filename(
1496                 Glib::get_home_dir(),
1497                 Glib::build_filename(".lv2", prefix + "_" + base_name + ".lv2"));
1498
1499 #ifdef HAVE_LILV_0_21_3
1500         /* delete reference to old preset (if any) */
1501         const PresetRecord* r = preset_by_label(name);
1502         if (r) {
1503                 LilvNode*  pset  = lilv_new_uri (_world.world, r->uri.c_str());
1504                 if (pset) {
1505                         lilv_world_unload_resource (_world.world, pset);
1506                         lilv_node_free(pset);
1507                 }
1508         }
1509 #endif
1510
1511         LilvState* state = lilv_state_new_from_instance(
1512                 _impl->plugin,
1513                 _impl->instance,
1514                 _uri_map.urid_map(),
1515                 scratch_dir().c_str(),                   // file_dir
1516                 bundle.c_str(),                          // copy_dir
1517                 bundle.c_str(),                          // link_dir
1518                 bundle.c_str(),                          // save_dir
1519                 lv2plugin_get_port_value,                // get_value
1520                 (void*)this,                             // user_data
1521                 LV2_STATE_IS_POD|LV2_STATE_IS_PORTABLE,  // flags
1522                 _features                                // features
1523         );
1524
1525         lilv_state_set_label(state, name.c_str());
1526         lilv_state_save(
1527                 _world.world,           // world
1528                 _uri_map.urid_map(),    // map
1529                 _uri_map.urid_unmap(),  // unmap
1530                 state,                  // state
1531                 NULL,                   // uri (NULL = use file URI)
1532                 bundle.c_str(),         // dir
1533                 file_name.c_str()       // filename
1534         );
1535
1536         lilv_state_free(state);
1537
1538         std::string uri = Glib::filename_to_uri(Glib::build_filename(bundle, file_name));
1539         LilvNode *node_bundle = lilv_new_uri(_world.world, Glib::filename_to_uri(Glib::build_filename(bundle, "/")).c_str());
1540         LilvNode *node_preset = lilv_new_uri(_world.world, uri.c_str());
1541 #ifdef HAVE_LILV_0_21_3
1542         lilv_world_unload_resource(_world.world, node_preset);
1543         lilv_world_unload_bundle(_world.world, node_bundle);
1544 #endif
1545         lilv_world_load_bundle(_world.world, node_bundle);
1546         lilv_world_load_resource(_world.world, node_preset);
1547         lilv_node_free(node_bundle);
1548         lilv_node_free(node_preset);
1549         lilv_node_free(plug_name);
1550         return uri;
1551 }
1552
1553 void
1554 LV2Plugin::do_remove_preset(string name)
1555 {
1556 #ifdef HAVE_LILV_0_21_3
1557         /* Look up preset record by label (FIXME: ick, label as ID) */
1558         const PresetRecord* r = preset_by_label(name);
1559         if (!r) {
1560                 return;
1561         }
1562
1563         /* Load a LilvState for the preset. */
1564         LilvWorld* world = _world.world;
1565         LilvNode*  pset  = lilv_new_uri(world, r->uri.c_str());
1566         LilvState* state = lilv_state_new_from_world(world, _uri_map.urid_map(), pset);
1567         if (!state) {
1568                 lilv_node_free(pset);
1569                 return;
1570         }
1571
1572         /* Unload preset from world. */
1573         lilv_world_unload_resource(world, pset);
1574
1575         /* Delete it from the file system.  This will remove the preset file and the entry
1576            from the manifest.  If this results in an empty manifest (i.e. the
1577            preset is the only thing in the bundle), then the bundle is removed. */
1578         lilv_state_delete(world, state);
1579
1580         lilv_state_free(state);
1581         lilv_node_free(pset);
1582 #endif
1583         /* Without lilv_state_delete(), we could delete the preset file, but this
1584            would leave a broken bundle/manifest around, so the preset would still
1585            be visible, but broken.  Naively deleting a bundle is too dangerous, so
1586            we simply do not support preset deletion with older Lilv */
1587 }
1588
1589 bool
1590 LV2Plugin::has_editor() const
1591 {
1592         return _impl->ui != NULL;
1593 }
1594
1595 bool
1596 LV2Plugin::has_message_output() const
1597 {
1598         for (uint32_t i = 0; i < num_ports(); ++i) {
1599                 if ((_port_flags[i] & PORT_SEQUENCE) &&
1600                     (_port_flags[i] & PORT_OUTPUT)) {
1601                         return true;
1602                 }
1603         }
1604         return false;
1605 }
1606
1607 bool
1608 LV2Plugin::write_to(RingBuffer<uint8_t>* dest,
1609                     uint32_t             index,
1610                     uint32_t             protocol,
1611                     uint32_t             size,
1612                     const uint8_t*       body)
1613 {
1614         const uint32_t  buf_size = sizeof(UIMessage) + size;
1615         vector<uint8_t> buf(buf_size);
1616
1617         UIMessage* msg = (UIMessage*)&buf[0];
1618         msg->index    = index;
1619         msg->protocol = protocol;
1620         msg->size     = size;
1621         memcpy(msg + 1, body, size);
1622
1623         return (dest->write(&buf[0], buf_size) == buf_size);
1624 }
1625
1626 bool
1627 LV2Plugin::write_from_ui(uint32_t       index,
1628                          uint32_t       protocol,
1629                          uint32_t       size,
1630                          const uint8_t* body)
1631 {
1632         if (!_from_ui) {
1633                 size_t rbs = _session.engine().raw_buffer_size(DataType::MIDI) * NBUFS;
1634                 /* buffer data communication from plugin UI to plugin instance.
1635                  * this buffer needs to potentially hold
1636                  *   (port's minimumSize) * (audio-periods) / (UI-periods)
1637                  * bytes.
1638                  *
1639                  *  e.g 48kSPS / 128fpp -> audio-periods = 375 Hz
1640                  *  ui-periods = 25 Hz (SuperRapidScreenUpdate)
1641                  *  default minimumSize = 32K (see LV2Plugin::allocate_atom_event_buffers()
1642                  *
1643                  * it is NOT safe to overflow (msg.size will be misinterpreted)
1644                  */
1645                 uint32_t bufsiz = 32768;
1646                 if (_atom_ev_buffers && _atom_ev_buffers[0]) {
1647                         bufsiz =  lv2_evbuf_get_capacity(_atom_ev_buffers[0]);
1648                 }
1649                 int fact = ceilf(_session.frame_rate () / 3000.f);
1650                 rbs = max((size_t) bufsiz * std::max (8, fact), rbs);
1651                 _from_ui = new RingBuffer<uint8_t>(rbs);
1652         }
1653
1654         if (!write_to(_from_ui, index, protocol, size, body)) {
1655                 error << "Error writing from UI to plugin" << endmsg;
1656                 return false;
1657         }
1658         return true;
1659 }
1660
1661 bool
1662 LV2Plugin::write_to_ui(uint32_t       index,
1663                        uint32_t       protocol,
1664                        uint32_t       size,
1665                        const uint8_t* body)
1666 {
1667         if (!write_to(_to_ui, index, protocol, size, body)) {
1668                 error << "Error writing from plugin to UI" << endmsg;
1669                 return false;
1670         }
1671         return true;
1672 }
1673
1674 static void
1675 forge_variant(LV2_Atom_Forge* forge, const Variant& value)
1676 {
1677         switch (value.type()) {
1678         case Variant::NOTHING:
1679                 break;
1680         case Variant::BEATS:
1681                 // No atom type for this, just forge a double
1682                 lv2_atom_forge_double(forge, value.get_beats().to_double());
1683                 break;
1684         case Variant::BOOL:
1685                 lv2_atom_forge_bool(forge, value.get_bool());
1686                 break;
1687         case Variant::DOUBLE:
1688                 lv2_atom_forge_double(forge, value.get_double());
1689                 break;
1690         case Variant::FLOAT:
1691                 lv2_atom_forge_float(forge, value.get_float());
1692                 break;
1693         case Variant::INT:
1694                 lv2_atom_forge_int(forge, value.get_int());
1695                 break;
1696         case Variant::LONG:
1697                 lv2_atom_forge_long(forge, value.get_long());
1698                 break;
1699         case Variant::PATH:
1700                 lv2_atom_forge_path(
1701                         forge, value.get_path().c_str(), value.get_path().size());
1702                 break;
1703         case Variant::STRING:
1704                 lv2_atom_forge_string(
1705                         forge, value.get_string().c_str(), value.get_string().size());
1706                 break;
1707         case Variant::URI:
1708                 lv2_atom_forge_uri(
1709                         forge, value.get_uri().c_str(), value.get_uri().size());
1710                 break;
1711         }
1712 }
1713
1714 /** Get a variant type from a URI, return false iff no match found. */
1715 static bool
1716 uri_to_variant_type(const std::string& uri, Variant::Type& type)
1717 {
1718         if (uri == LV2_ATOM__Bool) {
1719                 type = Variant::BOOL;
1720         } else if (uri == LV2_ATOM__Double) {
1721                 type = Variant::DOUBLE;
1722         } else if (uri == LV2_ATOM__Float) {
1723                 type = Variant::FLOAT;
1724         } else if (uri == LV2_ATOM__Int) {
1725                 type = Variant::INT;
1726         } else if (uri == LV2_ATOM__Long) {
1727                 type = Variant::LONG;
1728         } else if (uri == LV2_ATOM__Path) {
1729                 type = Variant::PATH;
1730         } else if (uri == LV2_ATOM__String) {
1731                 type = Variant::STRING;
1732         } else if (uri == LV2_ATOM__URI) {
1733                 type = Variant::URI;
1734         } else {
1735                 return false;
1736         }
1737         return true;
1738 }
1739
1740 void
1741 LV2Plugin::set_property(uint32_t key, const Variant& value)
1742 {
1743         if (_patch_port_in_index == (uint32_t)-1) {
1744                 error << "LV2: set_property called with unset patch_port_in_index" << endmsg;
1745                 return;
1746         } else if (value.type() == Variant::NOTHING) {
1747                 error << "LV2: set_property called with void value" << endmsg;
1748                 return;
1749         }
1750
1751         // Set up forge to write to temporary buffer on the stack
1752         LV2_Atom_Forge*      forge = &_impl->ui_forge;
1753         LV2_Atom_Forge_Frame frame;
1754         uint8_t              buf[PATH_MAX];  // Ought to be enough for anyone...
1755
1756         lv2_atom_forge_set_buffer(forge, buf, sizeof(buf));
1757
1758         // Serialize patch:Set message to set property
1759 #ifdef HAVE_LV2_1_10_0
1760         lv2_atom_forge_object(forge, &frame, 0, _uri_map.urids.patch_Set);
1761         lv2_atom_forge_key(forge, _uri_map.urids.patch_property);
1762         lv2_atom_forge_urid(forge, key);
1763         lv2_atom_forge_key(forge, _uri_map.urids.patch_value);
1764 #else
1765         lv2_atom_forge_blank(forge, &frame, 0, _uri_map.urids.patch_Set);
1766         lv2_atom_forge_property_head(forge, _uri_map.urids.patch_property, 0);
1767         lv2_atom_forge_urid(forge, key);
1768         lv2_atom_forge_property_head(forge, _uri_map.urids.patch_value, 0);
1769 #endif
1770
1771         forge_variant(forge, value);
1772
1773         // Write message to UI=>Plugin ring
1774         const LV2_Atom* const atom = (const LV2_Atom*)buf;
1775         write_from_ui(_patch_port_in_index,
1776                       _uri_map.urids.atom_eventTransfer,
1777                       lv2_atom_total_size(atom),
1778                       (const uint8_t*)atom);
1779 }
1780
1781 const ParameterDescriptor&
1782 LV2Plugin::get_property_descriptor(uint32_t id) const
1783 {
1784         PropertyDescriptors::const_iterator p = _property_descriptors.find(id);
1785         if (p != _property_descriptors.end()) {
1786                 return p->second;
1787         }
1788         return Plugin::get_property_descriptor(id);
1789 }
1790
1791 static void
1792 load_parameter_descriptor_units(LilvWorld* lworld, ParameterDescriptor& desc, const LilvNodes* units)
1793 {
1794         if (lilv_nodes_contains(units, _world.units_midiNote)) {
1795                 desc.unit = ParameterDescriptor::MIDI_NOTE;
1796         } else if (lilv_nodes_contains(units, _world.units_db)) {
1797                 desc.unit = ParameterDescriptor::DB;
1798         } else if (lilv_nodes_contains(units, _world.units_hz)) {
1799                 desc.unit = ParameterDescriptor::HZ;
1800         }
1801         if (lilv_nodes_size(units) > 0) {
1802                 const LilvNode* unit = lilv_nodes_get_first(units);
1803                 LilvNode* render = get_value(lworld, unit, _world.units_render);
1804                 if (render) {
1805                         desc.print_fmt = lilv_node_as_string(render);
1806                         replace_all (desc.print_fmt, "%f", "%.2f");
1807                         lilv_node_free(render);
1808                 }
1809         }
1810 }
1811
1812 static void
1813 load_parameter_descriptor(LV2World&            world,
1814                           ParameterDescriptor& desc,
1815                           Variant::Type        datatype,
1816                           const LilvNode*      subject)
1817 {
1818         LilvWorld* lworld  = _world.world;
1819         LilvNode*  label   = get_value(lworld, subject, _world.rdfs_label);
1820         LilvNode*  def     = get_value(lworld, subject, _world.lv2_default);
1821         LilvNode*  minimum = get_value(lworld, subject, _world.lv2_minimum);
1822         LilvNode*  maximum = get_value(lworld, subject, _world.lv2_maximum);
1823         LilvNodes* units   = lilv_world_find_nodes(lworld, subject, _world.units_unit, NULL);
1824         if (label) {
1825                 desc.label = lilv_node_as_string(label);
1826         }
1827         if (def) {
1828                 if (lilv_node_is_float(def)) {
1829                         desc.normal = lilv_node_as_float(def);
1830                 } else if (lilv_node_is_int(def)) {
1831                         desc.normal = lilv_node_as_int(def);
1832                 }
1833         }
1834         if (minimum) {
1835                 if (lilv_node_is_float(minimum)) {
1836                         desc.lower = lilv_node_as_float(minimum);
1837                 } else if (lilv_node_is_int(minimum)) {
1838                         desc.lower = lilv_node_as_int(minimum);
1839                 }
1840         }
1841         if (maximum) {
1842                 if (lilv_node_is_float(maximum)) {
1843                         desc.upper = lilv_node_as_float(maximum);
1844                 } else if (lilv_node_is_int(maximum)) {
1845                         desc.upper = lilv_node_as_int(maximum);
1846                 }
1847         }
1848         load_parameter_descriptor_units(lworld, desc, units);
1849         desc.datatype      = datatype;
1850         desc.toggled      |= datatype == Variant::BOOL;
1851         desc.integer_step |= datatype == Variant::INT || datatype == Variant::LONG;
1852         desc.update_steps();
1853
1854         lilv_nodes_free(units);
1855         lilv_node_free(label);
1856         lilv_node_free(def);
1857         lilv_node_free(minimum);
1858         lilv_node_free(maximum);
1859 }
1860
1861 void
1862 LV2Plugin::load_supported_properties(PropertyDescriptors& descs)
1863 {
1864         LilvWorld*       lworld     = _world.world;
1865         const LilvNode*  subject    = lilv_plugin_get_uri(_impl->plugin);
1866         LilvNodes*       properties = lilv_world_find_nodes(
1867                 lworld, subject, _world.patch_writable, NULL);
1868         LILV_FOREACH(nodes, p, properties) {
1869                 // Get label and range
1870                 const LilvNode* prop  = lilv_nodes_get(properties, p);
1871                 LilvNode*       range = get_value(lworld, prop, _world.rdfs_range);
1872                 if (!range) {
1873                         warning << string_compose(_("LV2: property <%1> has no range datatype, ignoring"),
1874                                                   lilv_node_as_uri(prop)) << endmsg;
1875                         continue;
1876                 }
1877
1878                 // Convert range to variant type (TODO: support for multiple range types)
1879                 Variant::Type datatype;
1880                 if (!uri_to_variant_type(lilv_node_as_uri(range), datatype)) {
1881                         error << string_compose(_("LV2: property <%1> has unsupported datatype <%1>"),
1882                                                 lilv_node_as_uri(prop), lilv_node_as_uri(range)) << endmsg;
1883                         continue;
1884                 }
1885
1886                 // Add description to result
1887                 ParameterDescriptor desc;
1888                 desc.key      = _uri_map.uri_to_id(lilv_node_as_uri(prop));
1889                 desc.datatype = datatype;
1890                 load_parameter_descriptor(_world, desc, datatype, prop);
1891                 descs.insert(std::make_pair(desc.key, desc));
1892
1893                 lilv_node_free(range);
1894         }
1895         lilv_nodes_free(properties);
1896 }
1897
1898 void
1899 LV2Plugin::announce_property_values()
1900 {
1901         if (_patch_port_in_index == (uint32_t)-1) {
1902                 return;
1903         }
1904
1905         // Set up forge to write to temporary buffer on the stack
1906         LV2_Atom_Forge*      forge = &_impl->ui_forge;
1907         LV2_Atom_Forge_Frame frame;
1908         uint8_t              buf[PATH_MAX];  // Ought to be enough for anyone...
1909
1910         lv2_atom_forge_set_buffer(forge, buf, sizeof(buf));
1911
1912         // Serialize patch:Get message with no subject (implicitly plugin instance)
1913 #ifdef HAVE_LV2_1_10_0
1914         lv2_atom_forge_object(forge, &frame, 0, _uri_map.urids.patch_Get);
1915 #else
1916         lv2_atom_forge_blank(forge, &frame, 0, _uri_map.urids.patch_Get);
1917 #endif
1918
1919         // Write message to UI=>Plugin ring
1920         const LV2_Atom* const atom = (const LV2_Atom*)buf;
1921         write_from_ui(_patch_port_in_index,
1922                       _uri_map.urids.atom_eventTransfer,
1923                       lv2_atom_total_size(atom),
1924                       (const uint8_t*)atom);
1925 }
1926
1927 void
1928 LV2Plugin::enable_ui_emission()
1929 {
1930         if (!_to_ui) {
1931                 /* see note in LV2Plugin::write_from_ui() */
1932                 uint32_t bufsiz = 32768;
1933                 if (_atom_ev_buffers && _atom_ev_buffers[0]) {
1934                         bufsiz =  lv2_evbuf_get_capacity(_atom_ev_buffers[0]);
1935                 }
1936                 size_t rbs = _session.engine().raw_buffer_size(DataType::MIDI) * NBUFS;
1937                 rbs = max((size_t) bufsiz * 8, rbs);
1938                 _to_ui = new RingBuffer<uint8_t>(rbs);
1939         }
1940 }
1941
1942 void
1943 LV2Plugin::emit_to_ui(void* controller, UIMessageSink sink)
1944 {
1945         if (!_to_ui) {
1946                 return;
1947         }
1948
1949         uint32_t read_space = _to_ui->read_space();
1950         while (read_space > sizeof(UIMessage)) {
1951                 UIMessage msg;
1952                 if (_to_ui->read((uint8_t*)&msg, sizeof(msg)) != sizeof(msg)) {
1953                         error << "Error reading from Plugin=>UI RingBuffer" << endmsg;
1954                         break;
1955                 }
1956                 vector<uint8_t> body(msg.size);
1957                 if (_to_ui->read(&body[0], msg.size) != msg.size) {
1958                         error << "Error reading from Plugin=>UI RingBuffer" << endmsg;
1959                         break;
1960                 }
1961
1962                 sink(controller, msg.index, msg.size, msg.protocol, &body[0]);
1963
1964                 read_space -= sizeof(msg) + msg.size;
1965         }
1966 }
1967
1968 int
1969 LV2Plugin::work(Worker& worker, uint32_t size, const void* data)
1970 {
1971         Glib::Threads::Mutex::Lock lm(_work_mutex);
1972         return _impl->work_iface->work(
1973                 _impl->instance->lv2_handle, work_respond, &worker, size, data);
1974 }
1975
1976 int
1977 LV2Plugin::work_response(uint32_t size, const void* data)
1978 {
1979         return _impl->work_iface->work_response(
1980                 _impl->instance->lv2_handle, size, data);
1981 }
1982
1983 void
1984 LV2Plugin::set_insert_id(PBD::ID id)
1985 {
1986         if (_insert_id == "0") {
1987                 _insert_id = id;
1988         } else if (_insert_id != id) {
1989                 lilv_state_free(_impl->state);
1990                 _impl->state = NULL;
1991                 _insert_id   = id;
1992         }
1993 }
1994
1995 void
1996 LV2Plugin::set_state_dir (const std::string& d)
1997 {
1998         _plugin_state_dir = d;
1999 }
2000
2001 int
2002 LV2Plugin::set_state(const XMLNode& node, int version)
2003 {
2004         XMLNodeList          nodes;
2005         XMLNodeConstIterator iter;
2006         XMLNode*             child;
2007         LocaleGuard          lg;
2008
2009         if (node.name() != state_node_name()) {
2010                 error << _("Bad node sent to LV2Plugin::set_state") << endmsg;
2011                 return -1;
2012         }
2013
2014 #ifndef NO_PLUGIN_STATE
2015
2016         if (version < 3000) {
2017                 nodes = node.children("port");
2018         } else {
2019                 nodes = node.children("Port");
2020         }
2021
2022         for (iter = nodes.begin(); iter != nodes.end(); ++iter) {
2023
2024                 child = *iter;
2025
2026                 std::string sym;
2027                 if (!child->get_property("symbol", sym)) {
2028                         warning << _("LV2: port has no symbol, ignored") << endmsg;
2029                         continue;
2030                 }
2031
2032                 map<string, uint32_t>::iterator i = _port_indices.find(sym);
2033
2034                 uint32_t port_id;
2035
2036                 if (i != _port_indices.end()) {
2037                         port_id = i->second;
2038                 } else {
2039                         warning << _("LV2: port has unknown index, ignored") << endmsg;
2040                         continue;
2041                 }
2042
2043                 float val;
2044                 if (!child->get_property("value", val)) {
2045                         warning << _("LV2: port has no value, ignored") << endmsg;
2046                         continue;
2047                 }
2048
2049                 set_parameter(port_id, val);
2050         }
2051
2052         std::string template_dir;
2053         if (node.get_property("template-dir", template_dir)) {
2054                 set_state_dir (template_dir);
2055         }
2056
2057         _state_version = 0;
2058         std::string state_dir;
2059         if (node.get_property("state-dir", state_dir) != 0) {
2060                 if (sscanf(state_dir.c_str(), "state%u", &_state_version) != 1) {
2061                         error << string_compose(
2062                                 "LV2: failed to parse state version from \"%1\"",
2063                                 state_dir) << endmsg;
2064                 }
2065
2066                 std::string state_file = Glib::build_filename(
2067                         plugin_dir(),
2068                         Glib::build_filename(state_dir, "state.ttl"));
2069
2070                 LilvState* state = lilv_state_new_from_file(
2071                         _world.world, _uri_map.urid_map(), NULL, state_file.c_str());
2072
2073                 lilv_state_restore(state, _impl->instance, NULL, NULL, 0, NULL);
2074                 lilv_state_free(_impl->state);
2075                 _impl->state = state;
2076         }
2077
2078         if (!_plugin_state_dir.empty ()) {
2079                 // force save with session, next time (increment counter)
2080                 lilv_state_free (_impl->state);
2081                 _impl->state = NULL;
2082                 set_state_dir ("");
2083         }
2084
2085         latency_compute_run();
2086 #endif
2087
2088         return Plugin::set_state(node, version);
2089 }
2090
2091 int
2092 LV2Plugin::get_parameter_descriptor(uint32_t which, ParameterDescriptor& desc) const
2093 {
2094         const LilvPort* port = lilv_plugin_get_port_by_index(_impl->plugin, which);
2095         if (!port) {
2096                 error << string_compose("LV2: get descriptor of non-existent port %1", which)
2097                       << endmsg;
2098                 return 1;
2099         }
2100
2101         LilvNodes* portunits;
2102         LilvNode *def, *min, *max;
2103         lilv_port_get_range(_impl->plugin, port, &def, &min, &max);
2104         portunits = lilv_port_get_value(_impl->plugin, port, _world.units_unit);
2105
2106         LilvNode* steps   = lilv_port_get(_impl->plugin, port, _world.ext_rangeSteps);
2107
2108         // TODO: Once we can rely on lilv 0.18.0 being present,
2109         // load_parameter_descriptor() can be used for ports as well
2110         desc.integer_step = lilv_port_has_property(_impl->plugin, port, _world.lv2_integer);
2111         desc.toggled      = lilv_port_has_property(_impl->plugin, port, _world.lv2_toggled);
2112         desc.logarithmic  = lilv_port_has_property(_impl->plugin, port, _world.ext_logarithmic);
2113         desc.sr_dependent = lilv_port_has_property(_impl->plugin, port, _world.lv2_sampleRate);
2114         desc.label        = lilv_node_as_string(lilv_port_get_name(_impl->plugin, port));
2115         desc.normal       = def ? lilv_node_as_float(def) : 0.0f;
2116         desc.lower        = min ? lilv_node_as_float(min) : 0.0f;
2117         desc.upper        = max ? lilv_node_as_float(max) : 1.0f;
2118         load_parameter_descriptor_units(_world.world, desc, portunits);
2119
2120         if (desc.sr_dependent) {
2121                 desc.lower *= _session.frame_rate ();
2122                 desc.upper *= _session.frame_rate ();
2123         }
2124
2125         desc.enumeration = lilv_port_has_property(_impl->plugin, port, _world.lv2_enumeration);
2126         desc.scale_points = get_scale_points(which);
2127
2128         desc.update_steps();
2129
2130         if (steps) {
2131                 //override auto-calculated steps in update_steps()
2132                 float s = lilv_node_as_float (steps);
2133                 const float delta = desc.upper - desc.lower;
2134
2135                 desc.step = desc.smallstep = (delta / s);
2136                 desc.largestep = std::min ((delta / 5.0f), 10.f * desc.smallstep);
2137
2138                 if (desc.logarithmic) {
2139                         // TODO marry AutomationControl::internal_to_interface () with
2140                         // http://lv2plug.in/ns/ext/port-props/#rangeSteps
2141                         desc.smallstep = desc.smallstep / logf(s);
2142                         desc.step      = desc.step      / logf(s);
2143                         desc.largestep = desc.largestep / logf(s);
2144                 } else if (desc.integer_step) {
2145                         desc.smallstep = 1.0;
2146                         desc.step      = std::max(1.f, rintf (desc.step));
2147                         desc.largestep = std::max(1.f, rintf (desc.largestep));
2148                 }
2149                 DEBUG_TRACE(DEBUG::LV2, string_compose("parameter %1 small: %2, step: %3 largestep: %4\n",
2150                                         which, desc.smallstep, desc.step, desc.largestep));
2151         }
2152
2153
2154         lilv_node_free(def);
2155         lilv_node_free(min);
2156         lilv_node_free(max);
2157         lilv_node_free(steps);
2158         lilv_nodes_free(portunits);
2159
2160         return 0;
2161 }
2162
2163 Plugin::IOPortDescription
2164 LV2Plugin::describe_io_port (ARDOUR::DataType dt, bool input, uint32_t id) const
2165 {
2166         PortFlags match = 0;
2167         switch (dt) {
2168                 case DataType::AUDIO:
2169                         match = PORT_AUDIO;
2170                         break;
2171                 case DataType::MIDI:
2172                         match = PORT_SEQUENCE | PORT_MIDI; // ignore old PORT_EVENT
2173                         break;
2174                 default:
2175                         return Plugin::IOPortDescription ("?");
2176                         break;
2177         }
2178         if (input) {
2179                 match |= PORT_INPUT;
2180         } else {
2181                 match |= PORT_OUTPUT;
2182         }
2183
2184         uint32_t p = 0;
2185         uint32_t idx = UINT32_MAX;
2186
2187         uint32_t const num_ports = parameter_count();
2188         for (uint32_t port_index = 0; port_index < num_ports; ++port_index) {
2189                 PortFlags flags = _port_flags[port_index];
2190                 if ((flags & match) == match) {
2191                         if (p == id) {
2192                                 idx = port_index;
2193                         }
2194                         ++p;
2195                 }
2196         }
2197         if (idx == UINT32_MAX) {
2198                 return Plugin::IOPortDescription ("?");
2199         }
2200
2201         const LilvPort* pport = lilv_plugin_get_port_by_index (_impl->plugin, idx);
2202
2203         LilvNode* name = lilv_port_get_name(_impl->plugin, pport);
2204         Plugin::IOPortDescription iod (lilv_node_as_string (name));
2205         lilv_node_free(name);
2206
2207         /* get the port's pg:group */
2208         LilvNodes* groups = lilv_port_get_value (_impl->plugin, pport, _world.groups_group);
2209         if (lilv_nodes_size (groups) > 0) {
2210                 const LilvNode* group = lilv_nodes_get_first (groups);
2211                 LilvNodes* grouplabel = lilv_world_find_nodes (_world.world, group, _world.rdfs_label, NULL);
2212
2213                 /* get the name of the port-group */
2214                 if (lilv_nodes_size (grouplabel) > 0) {
2215                         const LilvNode* grpname = lilv_nodes_get_first (grouplabel);
2216                         iod.group_name = lilv_node_as_string (grpname);
2217                 }
2218                 lilv_nodes_free (grouplabel);
2219
2220                 /* get all port designations.
2221                  * we're interested in e.g. lv2:designation pg:right */
2222                 LilvNodes* designations = lilv_port_get_value (_impl->plugin, pport, _world.lv2_designation);
2223                 if (lilv_nodes_size (designations) > 0) {
2224                         /* get all pg:elements of the pg:group */
2225                         LilvNodes* group_childs = lilv_world_find_nodes (_world.world, group, _world.groups_element, NULL);
2226                         if (lilv_nodes_size (group_childs) > 0) {
2227                                 /* iterate over all port designations .. */
2228                                 LILV_FOREACH (nodes, i, designations) {
2229                                         const LilvNode* designation = lilv_nodes_get (designations, i);
2230                                         /* match the lv2:designation's element against the port-group's element */
2231                                         LILV_FOREACH (nodes, j, group_childs) {
2232                                                 const LilvNode* group_element = lilv_nodes_get (group_childs, j);
2233                                                 LilvNodes* elem = lilv_world_find_nodes (_world.world, group_element, _world.lv2_designation, designation);
2234                                                 /* found it. Now look up the index (channel-number) of the pg:Element */
2235                                                 if (lilv_nodes_size (elem) > 0) {
2236                                                         LilvNodes* idx = lilv_world_find_nodes (_world.world, lilv_nodes_get_first (elem), _world.lv2_index, NULL);
2237                                                         if (lilv_node_is_int (lilv_nodes_get_first (idx))) {
2238                                                                 iod.group_channel = lilv_node_as_int(lilv_nodes_get_first (idx));
2239                                                         }
2240                                                 }
2241                                         }
2242                                 }
2243                         }
2244                 }
2245                 lilv_nodes_free (groups);
2246                 lilv_nodes_free (designations);
2247         }
2248
2249         if (lilv_port_has_property(_impl->plugin, pport, _world.lv2_isSideChain)) {
2250                 iod.is_sidechain = true;
2251         }
2252         return iod;
2253 }
2254
2255 string
2256 LV2Plugin::describe_parameter(Evoral::Parameter which)
2257 {
2258         if (( which.type() == PluginAutomation) && ( which.id() < parameter_count()) ) {
2259
2260                 if (lilv_port_has_property(_impl->plugin,
2261                                         lilv_plugin_get_port_by_index(_impl->plugin, which.id()), _world.ext_notOnGUI)) {
2262                         return X_("hidden");
2263                 }
2264
2265                 if (lilv_port_has_property(_impl->plugin,
2266                                         lilv_plugin_get_port_by_index(_impl->plugin, which.id()), _world.lv2_freewheeling)) {
2267                         return X_("hidden");
2268                 }
2269
2270                 if (lilv_port_has_property(_impl->plugin,
2271                                         lilv_plugin_get_port_by_index(_impl->plugin, which.id()), _world.lv2_reportsLatency)) {
2272                         return X_("latency");
2273                 }
2274
2275                 LilvNode* name = lilv_port_get_name(_impl->plugin,
2276                                                     lilv_plugin_get_port_by_index(_impl->plugin, which.id()));
2277                 string ret(lilv_node_as_string(name));
2278                 lilv_node_free(name);
2279                 return ret;
2280         } else {
2281                 return "??";
2282         }
2283 }
2284
2285 framecnt_t
2286 LV2Plugin::max_latency () const
2287 {
2288         return _max_latency;
2289 }
2290
2291 framecnt_t
2292 LV2Plugin::signal_latency() const
2293 {
2294         if (_latency_control_port) {
2295                 return (framecnt_t)floor(*_latency_control_port);
2296         } else {
2297                 return 0;
2298         }
2299 }
2300
2301 set<Evoral::Parameter>
2302 LV2Plugin::automatable() const
2303 {
2304         set<Evoral::Parameter> ret;
2305
2306         for (uint32_t i = 0; i < parameter_count(); ++i) {
2307                 if (parameter_is_input(i) && parameter_is_control(i) && !(_port_flags[i] & PORT_NOAUTO)) {
2308                         ret.insert(ret.end(), Evoral::Parameter(PluginAutomation, 0, i));
2309                 }
2310         }
2311
2312         for (PropertyDescriptors::const_iterator p = _property_descriptors.begin();
2313              p != _property_descriptors.end();
2314              ++p) {
2315                 ret.insert(ret.end(), Evoral::Parameter(PluginPropertyAutomation, 0, p->first));
2316         }
2317         return ret;
2318 }
2319
2320 void
2321 LV2Plugin::set_automation_control (uint32_t i, boost::shared_ptr<AutomationControl> c)
2322 {
2323         if ((_port_flags[i] & (PORT_CTRLED | PORT_CTRLER))) {
2324                 DEBUG_TRACE(DEBUG::LV2Automate, string_compose ("Ctrl Port %1\n", i));
2325                 _ctrl_map [i] = AutomationCtrlPtr (new AutomationCtrl(c));
2326         }
2327 }
2328
2329 LV2Plugin::AutomationCtrlPtr
2330 LV2Plugin::get_automation_control (uint32_t i)
2331 {
2332         if (_ctrl_map.find (i) == _ctrl_map.end()) {
2333                 return AutomationCtrlPtr ();
2334         }
2335         return _ctrl_map[i];
2336 }
2337
2338 void
2339 LV2Plugin::activate()
2340 {
2341         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 activate\n", name()));
2342
2343         if (!_was_activated) {
2344                 lilv_instance_activate(_impl->instance);
2345                 _was_activated = true;
2346         }
2347 }
2348
2349 void
2350 LV2Plugin::deactivate()
2351 {
2352         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 deactivate\n", name()));
2353
2354         if (_was_activated) {
2355                 lilv_instance_deactivate(_impl->instance);
2356                 _was_activated = false;
2357         }
2358 }
2359
2360 void
2361 LV2Plugin::cleanup()
2362 {
2363         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 cleanup\n", name()));
2364
2365         deactivate();
2366         lilv_instance_free(_impl->instance);
2367         _impl->instance = NULL;
2368 }
2369
2370 void
2371 LV2Plugin::allocate_atom_event_buffers()
2372 {
2373         /* reserve local scratch buffers for ATOM event-queues */
2374         const LilvPlugin* p = _impl->plugin;
2375
2376         /* count non-MIDI atom event-ports
2377          * TODO: nicely ask drobilla to make a lilv_ call for that
2378          */
2379         int count_atom_out = 0;
2380         int count_atom_in = 0;
2381         int minimumSize = 32768; // TODO use a per-port minimum-size
2382         for (uint32_t i = 0; i < lilv_plugin_get_num_ports(p); ++i) {
2383                 const LilvPort* port  = lilv_plugin_get_port_by_index(p, i);
2384                 if (lilv_port_is_a(p, port, _world.atom_AtomPort)) {
2385                         LilvNodes* buffer_types = lilv_port_get_value(
2386                                 p, port, _world.atom_bufferType);
2387                         LilvNodes* atom_supports = lilv_port_get_value(
2388                                 p, port, _world.atom_supports);
2389
2390                         if (lilv_nodes_contains(buffer_types, _world.atom_Sequence)) {
2391                                 if (lilv_port_is_a(p, port, _world.lv2_InputPort)) {
2392                                         count_atom_in++;
2393                                 }
2394                                 if (lilv_port_is_a(p, port, _world.lv2_OutputPort)) {
2395                                         count_atom_out++;
2396                                 }
2397                                 LilvNodes* min_size_v = lilv_port_get_value(_impl->plugin, port, _world.rsz_minimumSize);
2398                                 LilvNode* min_size = min_size_v ? lilv_nodes_get_first(min_size_v) : NULL;
2399                                 if (min_size && lilv_node_is_int(min_size)) {
2400                                         minimumSize = std::max(minimumSize, lilv_node_as_int(min_size));
2401                                 }
2402                                 lilv_nodes_free(min_size_v);
2403                         }
2404                         lilv_nodes_free(buffer_types);
2405                         lilv_nodes_free(atom_supports);
2406                 }
2407         }
2408
2409         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 need buffers for %2 atom-in and %3 atom-out event-ports\n",
2410                                 name(), count_atom_in, count_atom_out));
2411
2412         const int total_atom_buffers = (count_atom_in + count_atom_out);
2413         if (_atom_ev_buffers || total_atom_buffers == 0) {
2414                 return;
2415         }
2416
2417         DEBUG_TRACE(DEBUG::LV2, string_compose("allocate %1 atom_ev_buffers of %2 bytes\n", total_atom_buffers, minimumSize));
2418         _atom_ev_buffers = (LV2_Evbuf**) malloc((total_atom_buffers + 1) * sizeof(LV2_Evbuf*));
2419         for (int i = 0; i < total_atom_buffers; ++i ) {
2420                 _atom_ev_buffers[i] = lv2_evbuf_new(minimumSize, LV2_EVBUF_ATOM,
2421                                 _uri_map.urids.atom_Chunk, _uri_map.urids.atom_Sequence);
2422         }
2423         _atom_ev_buffers[total_atom_buffers] = 0;
2424         return;
2425 }
2426
2427 /** Write an ardour position/time/tempo/meter as an LV2 event.
2428  * @return true on success.
2429  */
2430 static bool
2431 write_position(LV2_Atom_Forge*     forge,
2432                LV2_Evbuf*          buf,
2433                const TempoMetric&  t,
2434                Timecode::BBT_Time& bbt,
2435                double              speed,
2436                double              bpm,
2437                framepos_t          position,
2438                framecnt_t          offset)
2439 {
2440         const URIMap::URIDs& urids = URIMap::instance().urids;
2441
2442         uint8_t pos_buf[256];
2443         lv2_atom_forge_set_buffer(forge, pos_buf, sizeof(pos_buf));
2444         LV2_Atom_Forge_Frame frame;
2445 #ifdef HAVE_LV2_1_10_0
2446         lv2_atom_forge_object(forge, &frame, 0, urids.time_Position);
2447         lv2_atom_forge_key(forge, urids.time_frame);
2448         lv2_atom_forge_long(forge, position);
2449         lv2_atom_forge_key(forge, urids.time_speed);
2450         lv2_atom_forge_float(forge, speed);
2451         lv2_atom_forge_key(forge, urids.time_barBeat);
2452         lv2_atom_forge_float(forge, bbt.beats - 1 +
2453                              (bbt.ticks / Timecode::BBT_Time::ticks_per_beat));
2454         lv2_atom_forge_key(forge, urids.time_bar);
2455         lv2_atom_forge_long(forge, bbt.bars - 1);
2456         lv2_atom_forge_key(forge, urids.time_beatUnit);
2457         lv2_atom_forge_int(forge, t.meter().note_divisor());
2458         lv2_atom_forge_key(forge, urids.time_beatsPerBar);
2459         lv2_atom_forge_float(forge, t.meter().divisions_per_bar());
2460         lv2_atom_forge_key(forge, urids.time_beatsPerMinute);
2461         lv2_atom_forge_float(forge, bpm);
2462 #else
2463         lv2_atom_forge_blank(forge, &frame, 1, urids.time_Position);
2464         lv2_atom_forge_property_head(forge, urids.time_frame, 0);
2465         lv2_atom_forge_long(forge, position);
2466         lv2_atom_forge_property_head(forge, urids.time_speed, 0);
2467         lv2_atom_forge_float(forge, speed);
2468         lv2_atom_forge_property_head(forge, urids.time_barBeat, 0);
2469         lv2_atom_forge_float(forge, bbt.beats - 1 +
2470                              (bbt.ticks / Timecode::BBT_Time::ticks_per_beat));
2471         lv2_atom_forge_property_head(forge, urids.time_bar, 0);
2472         lv2_atom_forge_long(forge, bbt.bars - 1);
2473         lv2_atom_forge_property_head(forge, urids.time_beatUnit, 0);
2474         lv2_atom_forge_int(forge, t.meter().note_divisor());
2475         lv2_atom_forge_property_head(forge, urids.time_beatsPerBar, 0);
2476         lv2_atom_forge_float(forge, t.meter().divisions_per_bar());
2477         lv2_atom_forge_property_head(forge, urids.time_beatsPerMinute, 0);
2478         lv2_atom_forge_float(forge, bpm);
2479 #endif
2480
2481         LV2_Evbuf_Iterator    end  = lv2_evbuf_end(buf);
2482         const LV2_Atom* const atom = (const LV2_Atom*)pos_buf;
2483         return lv2_evbuf_write(&end, offset, 0, atom->type, atom->size,
2484                                (const uint8_t*)(atom + 1));
2485 }
2486
2487 int
2488 LV2Plugin::connect_and_run(BufferSet& bufs,
2489                 framepos_t start, framepos_t end, double speed,
2490                 ChanMapping in_map, ChanMapping out_map,
2491                 pframes_t nframes, framecnt_t offset)
2492 {
2493         DEBUG_TRACE(DEBUG::LV2, string_compose("%1 run %2 offset %3\n", name(), nframes, offset));
2494         Plugin::connect_and_run(bufs, start, end, speed, in_map, out_map, nframes, offset);
2495
2496         cycles_t then = get_cycles();
2497
2498         TempoMap&               tmap     = _session.tempo_map();
2499         Metrics::const_iterator metric_i = tmap.metrics_end();
2500         TempoMetric             tmetric  = tmap.metric_at(start, &metric_i);
2501
2502         if (_freewheel_control_port) {
2503                 *_freewheel_control_port = _session.engine().freewheeling() ? 1.f : 0.f;
2504         }
2505
2506         if (_bpm_control_port) {
2507                 *_bpm_control_port = tmap.tempo_at_frame (start).note_types_per_minute();
2508         }
2509
2510 #ifdef LV2_EXTENDED
2511         if (_can_write_automation && start != _next_cycle_start) {
2512                 // add guard-points after locating
2513                 for (AutomationCtrlMap::iterator i = _ctrl_map.begin(); i != _ctrl_map.end(); ++i) {
2514                         i->second->guard = true;
2515                 }
2516         }
2517 #endif
2518
2519         ChanCount bufs_count;
2520         bufs_count.set(DataType::AUDIO, 1);
2521         bufs_count.set(DataType::MIDI, 1);
2522         BufferSet& silent_bufs  = _session.get_silent_buffers(bufs_count);
2523         BufferSet& scratch_bufs = _session.get_scratch_buffers(bufs_count);
2524         uint32_t const num_ports = parameter_count();
2525         uint32_t const nil_index = std::numeric_limits<uint32_t>::max();
2526
2527         uint32_t audio_in_index  = 0;
2528         uint32_t audio_out_index = 0;
2529         uint32_t midi_in_index   = 0;
2530         uint32_t midi_out_index  = 0;
2531         uint32_t atom_port_index = 0;
2532         for (uint32_t port_index = 0; port_index < num_ports; ++port_index) {
2533                 void*     buf   = NULL;
2534                 uint32_t  index = nil_index;
2535                 PortFlags flags = _port_flags[port_index];
2536                 bool      valid = false;
2537                 if (flags & PORT_AUDIO) {
2538                         if (flags & PORT_INPUT) {
2539                                 index = in_map.get(DataType::AUDIO, audio_in_index++, &valid);
2540                                 buf = (valid)
2541                                         ? bufs.get_audio(index).data(offset)
2542                                         : silent_bufs.get_audio(0).data(offset);
2543                         } else {
2544                                 index = out_map.get(DataType::AUDIO, audio_out_index++, &valid);
2545                                 buf = (valid)
2546                                         ? bufs.get_audio(index).data(offset)
2547                                         : scratch_bufs.get_audio(0).data(offset);
2548                         }
2549                 } else if (flags & (PORT_EVENT|PORT_SEQUENCE)) {
2550                         /* FIXME: The checks here for bufs.count().n_midi() > index shouldn't
2551                            be necessary, but the mapping is illegal in some cases.  Ideally
2552                            that should be fixed, but this is easier...
2553                         */
2554                         if (flags & PORT_MIDI) {
2555                                 if (flags & PORT_INPUT) {
2556                                         index = in_map.get(DataType::MIDI, midi_in_index++, &valid);
2557                                 } else {
2558                                         index = out_map.get(DataType::MIDI, midi_out_index++, &valid);
2559                                 }
2560                                 if (valid && bufs.count().n_midi() > index) {
2561                                         /* Note, ensure_lv2_bufsize() is not RT safe!
2562                                          * However free()/alloc() is only called if a
2563                                          * plugin requires a rsz:minimumSize buffersize
2564                                          * and the existing buffer if smaller.
2565                                          */
2566                                         bufs.ensure_lv2_bufsize((flags & PORT_INPUT), index, _port_minimumSize[port_index]);
2567                                         _ev_buffers[port_index] = bufs.get_lv2_midi(
2568                                                 (flags & PORT_INPUT), index, (flags & PORT_EVENT));
2569                                 }
2570                         } else if ((flags & PORT_POSITION) && (flags & PORT_INPUT)) {
2571                                 lv2_evbuf_reset(_atom_ev_buffers[atom_port_index], true);
2572                                 _ev_buffers[port_index] = _atom_ev_buffers[atom_port_index++];
2573                                 valid                   = true;
2574                         }
2575
2576                         if (valid && (flags & PORT_INPUT)) {
2577                                 if ((flags & PORT_POSITION)) {
2578                                         Timecode::BBT_Time bbt (tmap.bbt_at_frame (start));
2579                                         double bpm = tmap.tempo_at_frame (start).note_types_per_minute();
2580                                         double beatpos = (bbt.bars - 1) * tmetric.meter().divisions_per_bar()
2581                                                        + (bbt.beats - 1)
2582                                                        + (bbt.ticks / Timecode::BBT_Time::ticks_per_beat);
2583                                         beatpos *= tmetric.meter().note_divisor() / 4.0;
2584                                         if (start != _next_cycle_start ||
2585                                                         speed != _next_cycle_speed ||
2586                                                         rint (1000 * beatpos) != rint(1000 * _next_cycle_beat) ||
2587                                                         bpm != _current_bpm) {
2588                                                 // Transport or Tempo has changed, write position at cycle start
2589                                                 write_position(&_impl->forge, _ev_buffers[port_index],
2590                                                                 tmetric, bbt, speed, bpm, start, 0);
2591                                         }
2592                                 }
2593
2594                                 // Get MIDI iterator range (empty range if no MIDI)
2595                                 MidiBuffer::iterator m = (index != nil_index)
2596                                         ? bufs.get_midi(index).begin()
2597                                         : silent_bufs.get_midi(0).end();
2598                                 MidiBuffer::iterator m_end = (index != nil_index)
2599                                         ? bufs.get_midi(index).end()
2600                                         : m;
2601
2602                                 // Now merge MIDI and any transport events into the buffer
2603                                 const uint32_t     type = _uri_map.urids.midi_MidiEvent;
2604                                 const framepos_t   tend = end;
2605                                 ++metric_i;
2606                                 while (m != m_end || (metric_i != tmap.metrics_end() &&
2607                                                       (*metric_i)->frame() < tend)) {
2608                                         MetricSection* metric = (metric_i != tmap.metrics_end())
2609                                                 ? *metric_i : NULL;
2610                                         if (m != m_end && (!metric || metric->frame() > (*m).time())) {
2611                                                 const Evoral::Event<framepos_t> ev(*m, false);
2612                                                 if (ev.time() < nframes) {
2613                                                         LV2_Evbuf_Iterator eend = lv2_evbuf_end(_ev_buffers[port_index]);
2614                                                         lv2_evbuf_write(&eend, ev.time(), 0, type, ev.size(), ev.buffer());
2615                                                 }
2616                                                 ++m;
2617                                         } else {
2618                                                 tmetric.set_metric(metric);
2619                                                 Timecode::BBT_Time bbt;
2620                                                 bbt = tmap.bbt_at_frame (metric->frame());
2621                                                 double bpm = tmap.tempo_at_frame (start/*XXX*/).note_types_per_minute();
2622                                                 write_position(&_impl->forge, _ev_buffers[port_index],
2623                                                                tmetric, bbt, speed, bpm,
2624                                                                metric->frame(),
2625                                                                metric->frame() - start);
2626                                                 ++metric_i;
2627                                         }
2628                                 }
2629                         } else if (!valid) {
2630                                 // Nothing we understand or care about, connect to scratch
2631                                 // see note for midi-buffer size above
2632                                 scratch_bufs.ensure_lv2_bufsize((flags & PORT_INPUT),
2633                                                 0, _port_minimumSize[port_index]);
2634                                 _ev_buffers[port_index] = scratch_bufs.get_lv2_midi(
2635                                         (flags & PORT_INPUT), 0, (flags & PORT_EVENT));
2636                         }
2637
2638                         buf = lv2_evbuf_get_buffer(_ev_buffers[port_index]);
2639                 } else {
2640                         continue;  // Control port, leave buffer alone
2641                 }
2642                 lilv_instance_connect_port(_impl->instance, port_index, buf);
2643         }
2644
2645         // Read messages from UI and push into appropriate buffers
2646         if (_from_ui) {
2647                 uint32_t read_space = _from_ui->read_space();
2648                 while (read_space > sizeof(UIMessage)) {
2649                         UIMessage msg;
2650                         if (_from_ui->read((uint8_t*)&msg, sizeof(msg)) != sizeof(msg)) {
2651                                 error << "Error reading from UI=>Plugin RingBuffer" << endmsg;
2652                                 break;
2653                         }
2654                         vector<uint8_t> body(msg.size);
2655                         if (_from_ui->read(&body[0], msg.size) != msg.size) {
2656                                 error << "Error reading from UI=>Plugin RingBuffer" << endmsg;
2657                                 break;
2658                         }
2659                         if (msg.protocol == URIMap::instance().urids.atom_eventTransfer) {
2660                                 LV2_Evbuf*            buf  = _ev_buffers[msg.index];
2661                                 LV2_Evbuf_Iterator    i    = lv2_evbuf_end(buf);
2662                                 const LV2_Atom* const atom = (const LV2_Atom*)&body[0];
2663                                 if (!lv2_evbuf_write(&i, nframes - 1, 0, atom->type, atom->size,
2664                                                 (const uint8_t*)(atom + 1))) {
2665                                         error << "Failed to write data to LV2 event buffer\n";
2666                                 }
2667                         } else {
2668                                 error << "Received unknown message type from UI" << endmsg;
2669                         }
2670                         read_space -= sizeof(UIMessage) + msg.size;
2671                 }
2672         }
2673
2674         run(nframes);
2675
2676         midi_out_index = 0;
2677         for (uint32_t port_index = 0; port_index < num_ports; ++port_index) {
2678                 PortFlags flags = _port_flags[port_index];
2679                 bool      valid = false;
2680
2681                 /* TODO ask drobilla about comment
2682                  * "Make Ardour event buffers generic so plugins can communicate"
2683                  * in libs/ardour/buffer_set.cc:310
2684                  *
2685                  * ideally the user could choose which of the following two modes
2686                  * to use (e.g. instrument/effect chains  MIDI OUT vs MIDI TRHU).
2687                  *
2688                  * This implementation follows the discussion on IRC Mar 16 2013 16:47 UTC
2689                  * 16:51 < drobilla> rgareus: [..] i.e always replace with MIDI output [of LV2 plugin] if it's there
2690                  * 16:52 < drobilla> rgareus: That would probably be good enough [..] to make users not complain
2691                  *                            for quite a while at least ;)
2692                  */
2693                 // copy output of LV2 plugin's MIDI port to Ardour MIDI buffers -- MIDI OUT
2694                 if ((flags & PORT_OUTPUT) && (flags & (PORT_EVENT|PORT_SEQUENCE|PORT_MIDI))) {
2695                         const uint32_t buf_index = out_map.get(
2696                                 DataType::MIDI, midi_out_index++, &valid);
2697                         if (valid) {
2698                                 bufs.forward_lv2_midi(_ev_buffers[port_index], buf_index);
2699                         }
2700                 }
2701                 // Flush MIDI (write back to Ardour MIDI buffers) -- MIDI THRU
2702                 else if ((flags & PORT_OUTPUT) && (flags & (PORT_EVENT|PORT_SEQUENCE))) {
2703                         const uint32_t buf_index = out_map.get(
2704                                 DataType::MIDI, midi_out_index++, &valid);
2705                         if (valid) {
2706                                 bufs.flush_lv2_midi(true, buf_index);
2707                         }
2708                 }
2709
2710                 // Write messages to UI
2711                 if ((_to_ui || _can_write_automation || _patch_port_out_index != (uint32_t)-1) &&
2712                     (flags & PORT_OUTPUT) && (flags & (PORT_EVENT|PORT_SEQUENCE))) {
2713                         LV2_Evbuf* buf = _ev_buffers[port_index];
2714                         for (LV2_Evbuf_Iterator i = lv2_evbuf_begin(buf);
2715                              lv2_evbuf_is_valid(i);
2716                              i = lv2_evbuf_next(i)) {
2717                                 uint32_t frames, subframes, type, size;
2718                                 uint8_t* data;
2719                                 lv2_evbuf_get(i, &frames, &subframes, &type, &size, &data);
2720
2721 #ifdef LV2_EXTENDED
2722                                 // Intercept Automation Write Events
2723                                 if ((flags & PORT_AUTOCTRL)) {
2724                                         LV2_Atom* atom = (LV2_Atom*)(data - sizeof(LV2_Atom));
2725                                         if (atom->type == _uri_map.urids.atom_Blank ||
2726                                                         atom->type == _uri_map.urids.atom_Object) {
2727                                                 LV2_Atom_Object* obj = (LV2_Atom_Object*)atom;
2728                                                 if (obj->body.otype == _uri_map.urids.auto_event) {
2729                                                         // only if transport_rolling ??
2730                                                         const LV2_Atom* parameter = NULL;
2731                                                         const LV2_Atom* value    = NULL;
2732                                                         lv2_atom_object_get(obj,
2733                                                                             _uri_map.urids.auto_parameter, &parameter,
2734                                                                             _uri_map.urids.auto_value,     &value,
2735                                                                             0);
2736                                                         if (parameter && value) {
2737                                                                 const uint32_t p = ((const LV2_Atom_Int*)parameter)->body;
2738                                                                 const float v = ((const LV2_Atom_Float*)value)->body;
2739                                                                 // -> add automation event..
2740                                                                 DEBUG_TRACE(DEBUG::LV2Automate,
2741                                                                                 string_compose ("Event p: %1 t: %2 v: %3\n", p, frames, v));
2742                                                                 AutomationCtrlPtr c = get_automation_control (p);
2743                                                                 if (c &&
2744                                                                      (c->ac->automation_state() == Touch || c->ac->automation_state() == Write)
2745                                                                    ) {
2746                                                                         framepos_t when = std::max ((framepos_t) 0, start + frames - _current_latency);
2747                                                                         assert (start + frames - _current_latency >= 0);
2748                                                                         if (c->guard) {
2749                                                                                 c->guard = false;
2750                                                                                 c->ac->list()->add (when, v, true, true);
2751                                                                         } else {
2752                                                                                 c->ac->set_double (v, when, true);
2753                                                                         }
2754                                                                 }
2755                                                         }
2756                                                 }
2757                                                 else if (obj->body.otype == _uri_map.urids.auto_setup) {
2758                                                         // TODO optional arguments, for now we assume the plugin
2759                                                         // writes automation for its own inputs
2760                                                         // -> put them in "touch" mode (preferably "exclusive plugin touch(TM)"
2761                                                         for (AutomationCtrlMap::iterator i = _ctrl_map.begin(); i != _ctrl_map.end(); ++i) {
2762                                                                 if (_port_flags[i->first] & PORT_CTRLED) {
2763                                                                         DEBUG_TRACE(DEBUG::LV2Automate,
2764                                                                                 string_compose ("Setup p: %1\n", i->first));
2765                                                                         i->second->ac->set_automation_state (Touch);
2766                                                                 }
2767                                                         }
2768                                                 }
2769                                                 else if (obj->body.otype == _uri_map.urids.auto_finalize) {
2770                                                         // set [touched] parameters to "play" ??
2771                                                         // allow plugin to change its mode (from analyze to apply)
2772                                                         const LV2_Atom* parameter = NULL;
2773                                                         const LV2_Atom* value    = NULL;
2774                                                         lv2_atom_object_get(obj,
2775                                                                             _uri_map.urids.auto_parameter, &parameter,
2776                                                                             _uri_map.urids.auto_value,     &value,
2777                                                                             0);
2778                                                         if (parameter && value) {
2779                                                                 const uint32_t p = ((const LV2_Atom_Int*)parameter)->body;
2780                                                                 const float v = ((const LV2_Atom_Float*)value)->body;
2781                                                                 AutomationCtrlPtr c = get_automation_control (p);
2782                                                                 DEBUG_TRACE(DEBUG::LV2Automate,
2783                                                                                 string_compose ("Finalize p: %1 v: %2\n", p, v));
2784                                                                 if (c && _port_flags[p] & PORT_CTRLER) {
2785                                                                         c->ac->set_value(v, Controllable::NoGroup);
2786                                                                 }
2787                                                         } else {
2788                                                                 DEBUG_TRACE(DEBUG::LV2Automate, "Finalize\n");
2789                                                         }
2790                                                         for (AutomationCtrlMap::iterator i = _ctrl_map.begin(); i != _ctrl_map.end(); ++i) {
2791                                                                 // guard will be false if an event was written
2792                                                                 if ((_port_flags[i->first] & PORT_CTRLED) && !i->second->guard) {
2793                                                                         DEBUG_TRACE(DEBUG::LV2Automate,
2794                                                                                 string_compose ("Thin p: %1\n", i->first));
2795                                                                         i->second->ac->alist ()->thin (20);
2796                                                                 }
2797                                                         }
2798                                                 }
2799                                                 else if (obj->body.otype == _uri_map.urids.auto_start) {
2800                                                         const LV2_Atom* parameter = NULL;
2801                                                         lv2_atom_object_get(obj,
2802                                                                             _uri_map.urids.auto_parameter, &parameter,
2803                                                                             0);
2804                                                         if (parameter) {
2805                                                                 const uint32_t p = ((const LV2_Atom_Int*)parameter)->body;
2806                                                                 AutomationCtrlPtr c = get_automation_control (p);
2807                                                                 DEBUG_TRACE(DEBUG::LV2Automate, string_compose ("Start Touch p: %1\n", p));
2808                                                                 if (c) {
2809                                                                         c->ac->start_touch (std::max ((framepos_t)0, start - _current_latency));
2810                                                                         c->guard = true;
2811                                                                 }
2812                                                         }
2813                                                 }
2814                                                 else if (obj->body.otype == _uri_map.urids.auto_end) {
2815                                                         const LV2_Atom* parameter = NULL;
2816                                                         lv2_atom_object_get(obj,
2817                                                                             _uri_map.urids.auto_parameter, &parameter,
2818                                                                             0);
2819                                                         if (parameter) {
2820                                                                 const uint32_t p = ((const LV2_Atom_Int*)parameter)->body;
2821                                                                 AutomationCtrlPtr c = get_automation_control (p);
2822                                                                 DEBUG_TRACE(DEBUG::LV2Automate, string_compose ("End Touch p: %1\n", p));
2823                                                                 if (c) {
2824                                                                         c->ac->stop_touch (true, std::max ((framepos_t)0, start - _current_latency));
2825                                                                 }
2826                                                         }
2827                                                 }
2828                                         }
2829                                 }
2830 #endif
2831                                 // Intercept state dirty message
2832                                 if (_has_state_interface /* && (flags & PORT_DIRTYMSG)*/) {
2833                                         LV2_Atom* atom = (LV2_Atom*)(data - sizeof(LV2_Atom));
2834                                         if (atom->type == _uri_map.urids.atom_Blank ||
2835                                             atom->type == _uri_map.urids.atom_Object) {
2836                                                 LV2_Atom_Object* obj = (LV2_Atom_Object*)atom;
2837                                                 if (obj->body.otype == _uri_map.urids.state_StateChanged) {
2838                                                         _session.set_dirty ();
2839                                                 }
2840                                         }
2841                                 }
2842
2843                                 // Intercept patch change messages to emit PropertyChanged signal
2844                                 if ((flags & PORT_PATCHMSG)) {
2845                                         LV2_Atom* atom = (LV2_Atom*)(data - sizeof(LV2_Atom));
2846                                         if (atom->type == _uri_map.urids.atom_Blank ||
2847                                             atom->type == _uri_map.urids.atom_Object) {
2848                                                 LV2_Atom_Object* obj = (LV2_Atom_Object*)atom;
2849                                                 if (obj->body.otype == _uri_map.urids.patch_Set) {
2850                                                         const LV2_Atom* property = NULL;
2851                                                         const LV2_Atom* value    = NULL;
2852                                                         lv2_atom_object_get(obj,
2853                                                                             _uri_map.urids.patch_property, &property,
2854                                                                             _uri_map.urids.patch_value,    &value,
2855                                                                             0);
2856
2857                                                         if (property && value &&
2858                                                             property->type == _uri_map.urids.atom_URID &&
2859                                                             value->type    == _uri_map.urids.atom_Path) {
2860                                                                 const uint32_t prop_id = ((const LV2_Atom_URID*)property)->body;
2861                                                                 const char*    path    = (const char*)LV2_ATOM_BODY_CONST(value);
2862
2863                                                                 // Emit PropertyChanged signal for UI
2864                                                                 // TODO: This should emit the control's Changed signal
2865                                                                 PropertyChanged(prop_id, Variant(Variant::PATH, path));
2866                                                         } else {
2867                                                                 std::cerr << "warning: patch:Set for unknown property" << std::endl;
2868                                                         }
2869                                                 }
2870                                         }
2871                                 }
2872
2873                                 if (!_to_ui) continue;
2874                                 write_to_ui(port_index, URIMap::instance().urids.atom_eventTransfer,
2875                                             size + sizeof(LV2_Atom),
2876                                             data - sizeof(LV2_Atom));
2877                         }
2878                 }
2879         }
2880
2881         cycles_t now = get_cycles();
2882         set_cycles((uint32_t)(now - then));
2883
2884         // Update expected transport information for next cycle so we can detect changes
2885         _next_cycle_speed = speed;
2886         _next_cycle_start = end;
2887
2888         {
2889                 /* keep track of lv2:timePosition like plugins can do.
2890                  * Note: for no-midi plugins, we only ever send information at cycle-start,
2891                  * so it needs to be realative to that.
2892                  */
2893                 TempoMetric t = tmap.metric_at(start);
2894                 _current_bpm = tmap.tempo_at_frame (start).note_types_per_minute();
2895                 Timecode::BBT_Time bbt (tmap.bbt_at_frame (start));
2896                 double beatpos = (bbt.bars - 1) * t.meter().divisions_per_bar()
2897                                + (bbt.beats - 1)
2898                                + (bbt.ticks / Timecode::BBT_Time::ticks_per_beat);
2899                 beatpos *= tmetric.meter().note_divisor() / 4.0;
2900                 _next_cycle_beat = beatpos + nframes * speed * _current_bpm / (60.f * _session.frame_rate());
2901         }
2902
2903         if (_latency_control_port) {
2904                 framecnt_t new_latency = signal_latency ();
2905                 _current_latency = new_latency;
2906         }
2907         return 0;
2908 }
2909
2910 bool
2911 LV2Plugin::parameter_is_control(uint32_t param) const
2912 {
2913         assert(param < _port_flags.size());
2914         return _port_flags[param] & PORT_CONTROL;
2915 }
2916
2917 bool
2918 LV2Plugin::parameter_is_audio(uint32_t param) const
2919 {
2920         assert(param < _port_flags.size());
2921         return _port_flags[param] & PORT_AUDIO;
2922 }
2923
2924 bool
2925 LV2Plugin::parameter_is_event(uint32_t param) const
2926 {
2927         assert(param < _port_flags.size());
2928         return _port_flags[param] & PORT_EVENT;
2929 }
2930
2931 bool
2932 LV2Plugin::parameter_is_output(uint32_t param) const
2933 {
2934         assert(param < _port_flags.size());
2935         return _port_flags[param] & PORT_OUTPUT;
2936 }
2937
2938 bool
2939 LV2Plugin::parameter_is_input(uint32_t param) const
2940 {
2941         assert(param < _port_flags.size());
2942         return _port_flags[param] & PORT_INPUT;
2943 }
2944
2945 uint32_t
2946 LV2Plugin::designated_bypass_port ()
2947 {
2948         const LilvPort* port = NULL;
2949         LilvNode* designation = lilv_new_uri (_world.world, LV2_CORE_PREFIX "enabled");
2950         port = lilv_plugin_get_port_by_designation (
2951                         _impl->plugin, _world.lv2_InputPort, designation);
2952         lilv_node_free(designation);
2953         if (port) {
2954                 return lilv_port_get_index (_impl->plugin, port);
2955         }
2956 #ifdef LV2_EXTENDED
2957         /* deprecated on 2016-Sep-18 in favor of lv2:enabled */
2958         designation = lilv_new_uri (_world.world, LV2_PROCESSING_URI__enable);
2959         port = lilv_plugin_get_port_by_designation (
2960                         _impl->plugin, _world.lv2_InputPort, designation);
2961         lilv_node_free(designation);
2962         if (port) {
2963                 return lilv_port_get_index (_impl->plugin, port);
2964         }
2965 #endif
2966         return UINT32_MAX;
2967 }
2968
2969 void
2970 LV2Plugin::print_parameter(uint32_t param, char* buf, uint32_t len) const
2971 {
2972         if (buf && len) {
2973                 if (param < parameter_count()) {
2974                         snprintf(buf, len, "%.3f", get_parameter(param));
2975                 } else {
2976                         strcat(buf, "0");
2977                 }
2978         }
2979 }
2980
2981 boost::shared_ptr<ScalePoints>
2982 LV2Plugin::get_scale_points(uint32_t port_index) const
2983 {
2984         const LilvPort*  port   = lilv_plugin_get_port_by_index(_impl->plugin, port_index);
2985         LilvScalePoints* points = lilv_port_get_scale_points(_impl->plugin, port);
2986
2987         boost::shared_ptr<ScalePoints> ret;
2988         if (!points) {
2989                 return ret;
2990         }
2991
2992         ret = boost::shared_ptr<ScalePoints>(new ScalePoints());
2993
2994         LILV_FOREACH(scale_points, i, points) {
2995                 const LilvScalePoint* p     = lilv_scale_points_get(points, i);
2996                 const LilvNode*       label = lilv_scale_point_get_label(p);
2997                 const LilvNode*       value = lilv_scale_point_get_value(p);
2998                 if (label && (lilv_node_is_float(value) || lilv_node_is_int(value))) {
2999                         ret->insert(make_pair(lilv_node_as_string(label),
3000                                               lilv_node_as_float(value)));
3001                 }
3002         }
3003
3004         lilv_scale_points_free(points);
3005         return ret;
3006 }
3007
3008 void
3009 LV2Plugin::run(pframes_t nframes, bool sync_work)
3010 {
3011         uint32_t const N = parameter_count();
3012         for (uint32_t i = 0; i < N; ++i) {
3013                 if (parameter_is_control(i) && parameter_is_input(i)) {
3014                         _control_data[i] = _shadow_data[i];
3015                 }
3016         }
3017
3018         if (_worker) {
3019                 // Execute work synchronously if we're freewheeling (export)
3020                 _worker->set_synchronous(sync_work || session().engine().freewheeling());
3021         }
3022
3023         // Run the plugin for this cycle
3024         lilv_instance_run(_impl->instance, nframes);
3025
3026         // Emit any queued worker responses (calls a plugin callback)
3027         if (_state_worker) {
3028                 _state_worker->emit_responses();
3029         }
3030         if (_worker) {
3031                 _worker->emit_responses();
3032         }
3033
3034         // Notify the plugin that a work run cycle is complete
3035         if (_impl->work_iface) {
3036                 if (_impl->work_iface->end_run) {
3037                         _impl->work_iface->end_run(_impl->instance->lv2_handle);
3038                 }
3039         }
3040 }
3041
3042 void
3043 LV2Plugin::latency_compute_run()
3044 {
3045         if (!_latency_control_port) {
3046                 return;
3047         }
3048
3049         // Run the plugin so that it can set its latency parameter
3050
3051         bool was_activated = _was_activated;
3052         activate();
3053
3054         uint32_t port_index = 0;
3055         uint32_t in_index   = 0;
3056         uint32_t out_index  = 0;
3057
3058         // this is done in the main thread. non realtime.
3059         const framecnt_t bufsize = _engine.samples_per_cycle();
3060         float            *buffer = (float*) malloc(_engine.samples_per_cycle() * sizeof(float));
3061
3062         memset(buffer, 0, sizeof(float) * bufsize);
3063
3064         // FIXME: Ensure plugins can handle in-place processing
3065
3066         port_index = 0;
3067
3068         while (port_index < parameter_count()) {
3069                 if (parameter_is_audio(port_index)) {
3070                         if (parameter_is_input(port_index)) {
3071                                 lilv_instance_connect_port(_impl->instance, port_index, buffer);
3072                                 in_index++;
3073                         } else if (parameter_is_output(port_index)) {
3074                                 lilv_instance_connect_port(_impl->instance, port_index, buffer);
3075                                 out_index++;
3076                         }
3077                 }
3078                 port_index++;
3079         }
3080
3081         run(bufsize, true);
3082         deactivate();
3083         if (was_activated) {
3084                 activate();
3085         }
3086         free(buffer);
3087 }
3088
3089 const LilvPort*
3090 LV2Plugin::Impl::designated_input (const char* uri, void** bufptrs[], void** bufptr)
3091 {
3092         const LilvPort* port = NULL;
3093         LilvNode* designation = lilv_new_uri(_world.world, uri);
3094         port = lilv_plugin_get_port_by_designation(
3095                 plugin, _world.lv2_InputPort, designation);
3096         lilv_node_free(designation);
3097         if (port) {
3098                 bufptrs[lilv_port_get_index(plugin, port)] = bufptr;
3099         }
3100         return port;
3101 }
3102
3103 static bool lv2_filter (const string& str, void* /*arg*/)
3104 {
3105         /* Not a dotfile, has a prefix before a period, suffix is "lv2" */
3106
3107         return str[0] != '.' && (str.length() > 3 && str.find (".lv2") == (str.length() - 4));
3108 }
3109
3110
3111 LV2World::LV2World()
3112         : world(lilv_world_new())
3113         , _bundle_checked(false)
3114 {
3115         atom_AtomPort      = lilv_new_uri(world, LV2_ATOM__AtomPort);
3116         atom_Chunk         = lilv_new_uri(world, LV2_ATOM__Chunk);
3117         atom_Sequence      = lilv_new_uri(world, LV2_ATOM__Sequence);
3118         atom_bufferType    = lilv_new_uri(world, LV2_ATOM__bufferType);
3119         atom_supports      = lilv_new_uri(world, LV2_ATOM__supports);
3120         atom_eventTransfer = lilv_new_uri(world, LV2_ATOM__eventTransfer);
3121         ev_EventPort       = lilv_new_uri(world, LILV_URI_EVENT_PORT);
3122         ext_logarithmic    = lilv_new_uri(world, LV2_PORT_PROPS__logarithmic);
3123         ext_notOnGUI       = lilv_new_uri(world, LV2_PORT_PROPS__notOnGUI);
3124         ext_expensive      = lilv_new_uri(world, LV2_PORT_PROPS__expensive);
3125         ext_causesArtifacts= lilv_new_uri(world, LV2_PORT_PROPS__causesArtifacts);
3126         ext_notAutomatic   = lilv_new_uri(world, LV2_PORT_PROPS__notAutomatic);
3127         ext_rangeSteps     = lilv_new_uri(world, LV2_PORT_PROPS__rangeSteps);
3128         groups_group       = lilv_new_uri(world, LV2_PORT_GROUPS__group);
3129         groups_element     = lilv_new_uri(world, LV2_PORT_GROUPS__element);
3130         lv2_AudioPort      = lilv_new_uri(world, LILV_URI_AUDIO_PORT);
3131         lv2_ControlPort    = lilv_new_uri(world, LILV_URI_CONTROL_PORT);
3132         lv2_InputPort      = lilv_new_uri(world, LILV_URI_INPUT_PORT);
3133         lv2_OutputPort     = lilv_new_uri(world, LILV_URI_OUTPUT_PORT);
3134         lv2_inPlaceBroken  = lilv_new_uri(world, LV2_CORE__inPlaceBroken);
3135         lv2_isSideChain    = lilv_new_uri(world, LV2_CORE_PREFIX "isSideChain");
3136         lv2_index          = lilv_new_uri(world, LV2_CORE__index);
3137         lv2_integer        = lilv_new_uri(world, LV2_CORE__integer);
3138         lv2_default        = lilv_new_uri(world, LV2_CORE__default);
3139         lv2_minimum        = lilv_new_uri(world, LV2_CORE__minimum);
3140         lv2_maximum        = lilv_new_uri(world, LV2_CORE__maximum);
3141         lv2_reportsLatency = lilv_new_uri(world, LV2_CORE__reportsLatency);
3142         lv2_sampleRate     = lilv_new_uri(world, LV2_CORE__sampleRate);
3143         lv2_toggled        = lilv_new_uri(world, LV2_CORE__toggled);
3144         lv2_designation    = lilv_new_uri(world, LV2_CORE__designation);
3145         lv2_enumeration    = lilv_new_uri(world, LV2_CORE__enumeration);
3146         lv2_freewheeling   = lilv_new_uri(world, LV2_CORE__freeWheeling);
3147         midi_MidiEvent     = lilv_new_uri(world, LILV_URI_MIDI_EVENT);
3148         rdfs_comment       = lilv_new_uri(world, LILV_NS_RDFS "comment");
3149         rdfs_label         = lilv_new_uri(world, LILV_NS_RDFS "label");
3150         rdfs_range         = lilv_new_uri(world, LILV_NS_RDFS "range");
3151         rsz_minimumSize    = lilv_new_uri(world, LV2_RESIZE_PORT__minimumSize);
3152         time_Position      = lilv_new_uri(world, LV2_TIME__Position);
3153         ui_GtkUI           = lilv_new_uri(world, LV2_UI__GtkUI);
3154         ui_external        = lilv_new_uri(world, "http://lv2plug.in/ns/extensions/ui#external");
3155         ui_externalkx      = lilv_new_uri(world, "http://kxstudio.sf.net/ns/lv2ext/external-ui#Widget");
3156         units_unit         = lilv_new_uri(world, LV2_UNITS__unit);
3157         units_render       = lilv_new_uri(world, LV2_UNITS__render);
3158         units_hz           = lilv_new_uri(world, LV2_UNITS__hz);
3159         units_midiNote     = lilv_new_uri(world, LV2_UNITS__midiNote);
3160         units_db           = lilv_new_uri(world, LV2_UNITS__db);
3161         patch_writable     = lilv_new_uri(world, LV2_PATCH__writable);
3162         patch_Message      = lilv_new_uri(world, LV2_PATCH__Message);
3163 #ifdef LV2_EXTENDED
3164         lv2_noSampleAccurateCtrl    = lilv_new_uri(world, "http://ardour.org/lv2/ext#noSampleAccurateControls"); // deprecated 2016-09-18
3165         auto_can_write_automatation = lilv_new_uri(world, LV2_AUTOMATE_URI__can_write);
3166         auto_automation_control     = lilv_new_uri(world, LV2_AUTOMATE_URI__control);
3167         auto_automation_controlled  = lilv_new_uri(world, LV2_AUTOMATE_URI__controlled);
3168         auto_automation_controller  = lilv_new_uri(world, LV2_AUTOMATE_URI__controller);
3169 #endif
3170 #ifdef HAVE_LV2_1_2_0
3171         bufz_powerOf2BlockLength = lilv_new_uri(world, LV2_BUF_SIZE__powerOf2BlockLength);
3172         bufz_fixedBlockLength    = lilv_new_uri(world, LV2_BUF_SIZE__fixedBlockLength);
3173         bufz_nominalBlockLength  = lilv_new_uri(world, "http://lv2plug.in/ns/ext/buf-size#nominalBlockLength");
3174         bufz_coarseBlockLength   = lilv_new_uri(world, "http://lv2plug.in/ns/ext/buf-size#coarseBlockLength");
3175 #endif
3176
3177 }
3178
3179 LV2World::~LV2World()
3180 {
3181         if (!world) {
3182                 return;
3183         }
3184 #ifdef HAVE_LV2_1_2_0
3185         lilv_node_free(bufz_coarseBlockLength);
3186         lilv_node_free(bufz_nominalBlockLength);
3187         lilv_node_free(bufz_fixedBlockLength);
3188         lilv_node_free(bufz_powerOf2BlockLength);
3189 #endif
3190 #ifdef LV2_EXTENDED
3191         lilv_node_free(lv2_noSampleAccurateCtrl);
3192         lilv_node_free(auto_can_write_automatation);
3193         lilv_node_free(auto_automation_control);
3194         lilv_node_free(auto_automation_controlled);
3195         lilv_node_free(auto_automation_controller);
3196 #endif
3197         lilv_node_free(patch_Message);
3198         lilv_node_free(patch_writable);
3199         lilv_node_free(units_hz);
3200         lilv_node_free(units_midiNote);
3201         lilv_node_free(units_db);
3202         lilv_node_free(units_unit);
3203         lilv_node_free(units_render);
3204         lilv_node_free(ui_externalkx);
3205         lilv_node_free(ui_external);
3206         lilv_node_free(ui_GtkUI);
3207         lilv_node_free(time_Position);
3208         lilv_node_free(rsz_minimumSize);
3209         lilv_node_free(rdfs_comment);
3210         lilv_node_free(rdfs_label);
3211         lilv_node_free(rdfs_range);
3212         lilv_node_free(midi_MidiEvent);
3213         lilv_node_free(lv2_designation);
3214         lilv_node_free(lv2_enumeration);
3215         lilv_node_free(lv2_freewheeling);
3216         lilv_node_free(lv2_toggled);
3217         lilv_node_free(lv2_sampleRate);
3218         lilv_node_free(lv2_reportsLatency);
3219         lilv_node_free(lv2_index);
3220         lilv_node_free(lv2_integer);
3221         lilv_node_free(lv2_isSideChain);
3222         lilv_node_free(lv2_inPlaceBroken);
3223         lilv_node_free(lv2_OutputPort);
3224         lilv_node_free(lv2_InputPort);
3225         lilv_node_free(lv2_ControlPort);
3226         lilv_node_free(lv2_AudioPort);
3227         lilv_node_free(groups_group);
3228         lilv_node_free(groups_element);
3229         lilv_node_free(ext_rangeSteps);
3230         lilv_node_free(ext_notAutomatic);
3231         lilv_node_free(ext_causesArtifacts);
3232         lilv_node_free(ext_expensive);
3233         lilv_node_free(ext_notOnGUI);
3234         lilv_node_free(ext_logarithmic);
3235         lilv_node_free(ev_EventPort);
3236         lilv_node_free(atom_supports);
3237         lilv_node_free(atom_eventTransfer);
3238         lilv_node_free(atom_bufferType);
3239         lilv_node_free(atom_Sequence);
3240         lilv_node_free(atom_Chunk);
3241         lilv_node_free(atom_AtomPort);
3242         lilv_world_free(world);
3243         world = NULL;
3244 }
3245
3246 void
3247 LV2World::load_bundled_plugins(bool verbose)
3248 {
3249         if (!_bundle_checked) {
3250                 if (verbose) {
3251                         cout << "Scanning folders for bundled LV2s: " << ARDOUR::lv2_bundled_search_path().to_string() << endl;
3252                 }
3253
3254                 vector<string> plugin_objects;
3255                 find_paths_matching_filter (plugin_objects, ARDOUR::lv2_bundled_search_path(), lv2_filter, 0, true, true, true);
3256                 for ( vector<string>::iterator x = plugin_objects.begin(); x != plugin_objects.end (); ++x) {
3257 #ifdef PLATFORM_WINDOWS
3258                         string uri = "file:///" + *x + "/";
3259 #else
3260                         string uri = "file://" + *x + "/";
3261 #endif
3262                         LilvNode *node = lilv_new_uri(world, uri.c_str());
3263                         lilv_world_load_bundle(world, node);
3264                         lilv_node_free(node);
3265                 }
3266
3267                 lilv_world_load_all(world);
3268                 _bundle_checked = true;
3269         }
3270 }
3271
3272 LV2PluginInfo::LV2PluginInfo (const char* plugin_uri)
3273 {
3274         type = ARDOUR::LV2;
3275         _plugin_uri = strdup(plugin_uri);
3276 }
3277
3278 LV2PluginInfo::~LV2PluginInfo()
3279 {
3280         free(_plugin_uri);
3281         _plugin_uri = NULL;
3282 }
3283
3284 PluginPtr
3285 LV2PluginInfo::load(Session& session)
3286 {
3287         try {
3288                 PluginPtr plugin;
3289                 const LilvPlugins* plugins = lilv_world_get_all_plugins(_world.world);
3290                 LilvNode* uri = lilv_new_uri(_world.world, _plugin_uri);
3291                 if (!uri) { throw failed_constructor(); }
3292                 const LilvPlugin* lp = lilv_plugins_get_by_uri(plugins, uri);
3293                 if (!lp) { throw failed_constructor(); }
3294                 plugin.reset(new LV2Plugin(session.engine(), session, lp, session.frame_rate()));
3295                 lilv_node_free(uri);
3296                 plugin->set_info(PluginInfoPtr(shared_from_this ()));
3297                 return plugin;
3298         } catch (failed_constructor& err) {
3299                 return PluginPtr((Plugin*)0);
3300         }
3301
3302         return PluginPtr();
3303 }
3304
3305 std::vector<Plugin::PresetRecord>
3306 LV2PluginInfo::get_presets (bool /*user_only*/) const
3307 {
3308         std::vector<Plugin::PresetRecord> p;
3309 #ifndef NO_PLUGIN_STATE
3310         const LilvPlugin* lp = NULL;
3311         try {
3312                 PluginPtr plugin;
3313                 const LilvPlugins* plugins = lilv_world_get_all_plugins(_world.world);
3314                 LilvNode* uri = lilv_new_uri(_world.world, _plugin_uri);
3315                 if (!uri) { throw failed_constructor(); }
3316                 lp = lilv_plugins_get_by_uri(plugins, uri);
3317                 if (!lp) { throw failed_constructor(); }
3318                 lilv_node_free(uri);
3319         } catch (failed_constructor& err) {
3320                 return p;
3321         }
3322         assert (lp);
3323         // see LV2Plugin::find_presets
3324         LilvNode* lv2_appliesTo = lilv_new_uri(_world.world, LV2_CORE__appliesTo);
3325         LilvNode* pset_Preset   = lilv_new_uri(_world.world, LV2_PRESETS__Preset);
3326         LilvNode* rdfs_label    = lilv_new_uri(_world.world, LILV_NS_RDFS "label");
3327
3328         LilvNodes* presets = lilv_plugin_get_related(lp, pset_Preset);
3329         LILV_FOREACH(nodes, i, presets) {
3330                 const LilvNode* preset = lilv_nodes_get(presets, i);
3331                 lilv_world_load_resource(_world.world, preset);
3332                 LilvNode* name = get_value(_world.world, preset, rdfs_label);
3333                 bool userpreset = true; // TODO
3334                 if (name) {
3335                         p.push_back (Plugin::PresetRecord (lilv_node_as_string(preset), lilv_node_as_string(name), userpreset));
3336                         lilv_node_free(name);
3337                 }
3338         }
3339         lilv_nodes_free(presets);
3340         lilv_node_free(rdfs_label);
3341         lilv_node_free(pset_Preset);
3342         lilv_node_free(lv2_appliesTo);
3343 #endif
3344         return p;
3345 }
3346
3347 bool
3348 LV2PluginInfo::in_category (const std::string &c) const
3349 {
3350         // TODO use untranslated lilv_plugin_get_class()
3351         // match gtk2_ardour/plugin_selector.cc
3352         return category == c;
3353 }
3354
3355 bool
3356 LV2PluginInfo::is_instrument () const
3357 {
3358         if (category == "Instrument") {
3359                 return true;
3360         }
3361 #if 1
3362         /* until we make sure that category remains untranslated in the lv2.ttl spec
3363          * and until most instruments also classify themselves as such, there's a 2nd check:
3364          */
3365         if (n_inputs.n_midi() > 0 && n_inputs.n_audio() == 0 && n_outputs.n_audio() > 0) {
3366                 return true;
3367         }
3368 #endif
3369         return false;
3370 }
3371
3372 PluginInfoList*
3373 LV2PluginInfo::discover()
3374 {
3375         LV2World world;
3376         world.load_bundled_plugins();
3377         _world.load_bundled_plugins(true);
3378
3379         PluginInfoList*    plugs   = new PluginInfoList;
3380         const LilvPlugins* plugins = lilv_world_get_all_plugins(world.world);
3381
3382         LILV_FOREACH(plugins, i, plugins) {
3383                 const LilvPlugin* p = lilv_plugins_get(plugins, i);
3384                 const LilvNode* pun = lilv_plugin_get_uri(p);
3385                 if (!pun) continue;
3386                 LV2PluginInfoPtr info(new LV2PluginInfo(lilv_node_as_string(pun)));
3387
3388                 LilvNode* name = lilv_plugin_get_name(p);
3389                 if (!name || !lilv_plugin_get_port_by_index(p, 0)) {
3390                         warning << "Ignoring invalid LV2 plugin "
3391                                 << lilv_node_as_string(lilv_plugin_get_uri(p))
3392                                 << endmsg;
3393                         continue;
3394                 }
3395
3396                 if (lilv_plugin_has_feature(p, world.lv2_inPlaceBroken)) {
3397                         warning << string_compose(
3398                             _("Ignoring LV2 plugin \"%1\" since it cannot do inplace processing."),
3399                             lilv_node_as_string(name)) << endmsg;
3400                         lilv_node_free(name);
3401                         continue;
3402                 }
3403
3404 #ifdef HAVE_LV2_1_2_0
3405                 LilvNodes *required_features = lilv_plugin_get_required_features (p);
3406                 if (lilv_nodes_contains (required_features, world.bufz_powerOf2BlockLength) ||
3407                                 lilv_nodes_contains (required_features, world.bufz_fixedBlockLength)
3408                    ) {
3409                         warning << string_compose(
3410                             _("Ignoring LV2 plugin \"%1\" because its buffer-size requirements cannot be satisfied."),
3411                             lilv_node_as_string(name)) << endmsg;
3412                         lilv_nodes_free(required_features);
3413                         lilv_node_free(name);
3414                         continue;
3415                 }
3416                 lilv_nodes_free(required_features);
3417 #endif
3418
3419                 info->type = LV2;
3420
3421                 info->name = string(lilv_node_as_string(name));
3422                 lilv_node_free(name);
3423                 ARDOUR::PluginScanMessage(_("LV2"), info->name, false);
3424
3425                 const LilvPluginClass* pclass = lilv_plugin_get_class(p);
3426                 const LilvNode*        label  = lilv_plugin_class_get_label(pclass);
3427                 info->category = lilv_node_as_string(label);
3428
3429                 LilvNode* author_name = lilv_plugin_get_author_name(p);
3430                 info->creator = author_name ? string(lilv_node_as_string(author_name)) : "Unknown";
3431                 lilv_node_free(author_name);
3432
3433                 info->path = "/NOPATH"; // Meaningless for LV2
3434
3435                 /* count atom-event-ports that feature
3436                  * atom:supports <http://lv2plug.in/ns/ext/midi#MidiEvent>
3437                  *
3438                  * TODO: nicely ask drobilla to make a lilv_ call for that
3439                  */
3440                 int count_midi_out = 0;
3441                 int count_midi_in = 0;
3442                 for (uint32_t i = 0; i < lilv_plugin_get_num_ports(p); ++i) {
3443                         const LilvPort* port  = lilv_plugin_get_port_by_index(p, i);
3444                         if (lilv_port_is_a(p, port, world.atom_AtomPort)) {
3445                                 LilvNodes* buffer_types = lilv_port_get_value(
3446                                         p, port, world.atom_bufferType);
3447                                 LilvNodes* atom_supports = lilv_port_get_value(
3448                                         p, port, world.atom_supports);
3449
3450                                 if (lilv_nodes_contains(buffer_types, world.atom_Sequence)
3451                                                 && lilv_nodes_contains(atom_supports, world.midi_MidiEvent)) {
3452                                         if (lilv_port_is_a(p, port, world.lv2_InputPort)) {
3453                                                 count_midi_in++;
3454                                         }
3455                                         if (lilv_port_is_a(p, port, world.lv2_OutputPort)) {
3456                                                 count_midi_out++;
3457                                         }
3458                                 }
3459                                 lilv_nodes_free(buffer_types);
3460                                 lilv_nodes_free(atom_supports);
3461                         }
3462                 }
3463
3464                 info->n_inputs.set_audio(
3465                         lilv_plugin_get_num_ports_of_class(
3466                                 p, world.lv2_InputPort, world.lv2_AudioPort, NULL));
3467                 info->n_inputs.set_midi(
3468                         lilv_plugin_get_num_ports_of_class(
3469                                 p, world.lv2_InputPort, world.ev_EventPort, NULL)
3470                         + count_midi_in);
3471
3472                 info->n_outputs.set_audio(
3473                         lilv_plugin_get_num_ports_of_class(
3474                                 p, world.lv2_OutputPort, world.lv2_AudioPort, NULL));
3475                 info->n_outputs.set_midi(
3476                         lilv_plugin_get_num_ports_of_class(
3477                                 p, world.lv2_OutputPort, world.ev_EventPort, NULL)
3478                         + count_midi_out);
3479
3480                 info->unique_id = lilv_node_as_uri(lilv_plugin_get_uri(p));
3481                 info->index     = 0; // Meaningless for LV2
3482
3483                 plugs->push_back(info);
3484         }
3485
3486         return plugs;
3487 }