Carla/source/backend/plugin/Lv2Plugin.cpp

/*
 * Carla LV2 Plugin
 * Copyright (C) 2011-2013 Filipe Coelho <falktx@falktx.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * For a full copy of the GNU General Public License see the GPL.txt file
 */

#include "CarlaPluginInternal.hpp"

#ifdef WANT_LV2

#include "CarlaPluginGui.hpp"
#include "CarlaLv2Utils.hpp"

#include <QtCore/QDir>

extern "C" {
#include "rtmempool/rtmempool-lv2.h"
}

// -----------------------------------------------------
// Our LV2 World class object

Lv2WorldClass gLv2World;

// -----------------------------------------------------

CARLA_BACKEND_START_NAMESPACE

#if 0
}
#endif

/*!
 * @defgroup PluginHints Plugin Hints
 * @{
 */
const unsigned int PLUGIN_HAS_EXTENSION_PROGRAMS = 0x1000; //!< LV2 Plugin has Programs extension
const unsigned int PLUGIN_HAS_EXTENSION_STATE    = 0x2000; //!< LV2 Plugin has State extension
const unsigned int PLUGIN_HAS_EXTENSION_WORKER   = 0x4000; //!< LV2 Plugin has Worker extension
/**@}*/

/*!
 * @defgroup ParameterHints Parameter Hints
 * @{
 */
const unsigned int PARAMETER_IS_STRICT_BOUNDS = 0x1000; //!< LV2 Parameter needs strict bounds
const unsigned int PARAMETER_IS_TRIGGER       = 0x2000; //!< LV2 Parameter is trigger (current value should be changed to its default after run())
/**@}*/

/*!
 * @defgroup Lv2EventTypes LV2 Event Data/Types
 *
 * Data and buffer types for LV2 EventData ports.
 * @{
 */
const unsigned int CARLA_EVENT_DATA_ATOM    = 0x01;
const unsigned int CARLA_EVENT_DATA_EVENT   = 0x02;
const unsigned int CARLA_EVENT_DATA_MIDI_LL = 0x04;
const unsigned int CARLA_EVENT_TYPE_MESSAGE = 0x10;
const unsigned int CARLA_EVENT_TYPE_MIDI    = 0x20;
const unsigned int CARLA_EVENT_TYPE_TIME    = 0x40;
/**@}*/

/*!
 * @defgroup Lv2UriMapIds LV2 URI Map Ids
 *
 * Static index list of the internal LV2 URI Map Ids.
 * @{
 */
const uint32_t CARLA_URI_MAP_ID_NULL                = 0;
const uint32_t CARLA_URI_MAP_ID_ATOM_CHUNK          = 1;
const uint32_t CARLA_URI_MAP_ID_ATOM_DOUBLE         = 2;
const uint32_t CARLA_URI_MAP_ID_ATOM_INT            = 3;
const uint32_t CARLA_URI_MAP_ID_ATOM_PATH           = 4;
const uint32_t CARLA_URI_MAP_ID_ATOM_SEQUENCE       = 5;
const uint32_t CARLA_URI_MAP_ID_ATOM_STRING         = 6;
const uint32_t CARLA_URI_MAP_ID_ATOM_TRANSFER_ATOM  = 7;
const uint32_t CARLA_URI_MAP_ID_ATOM_TRANSFER_EVENT = 8;
const uint32_t CARLA_URI_MAP_ID_BUF_MAX_LENGTH      = 9;
const uint32_t CARLA_URI_MAP_ID_BUF_MIN_LENGTH      = 10;
const uint32_t CARLA_URI_MAP_ID_BUF_SEQUENCE_SIZE   = 11;
const uint32_t CARLA_URI_MAP_ID_LOG_ERROR           = 12;
const uint32_t CARLA_URI_MAP_ID_LOG_NOTE            = 13;
const uint32_t CARLA_URI_MAP_ID_LOG_TRACE           = 14;
const uint32_t CARLA_URI_MAP_ID_LOG_WARNING         = 15;
const uint32_t CARLA_URI_MAP_ID_MIDI_EVENT          = 16;
const uint32_t CARLA_URI_MAP_ID_PARAM_SAMPLE_RATE   = 17;
const uint32_t CARLA_URI_MAP_ID_TIME_POSITION       = 18;
const uint32_t CARLA_URI_MAP_ID_COUNT               = 19;
/**@}*/

/*!
 * @defgroup Lv2FeatureIds LV2 Feature Ids
 *
 * Static index list of the internal LV2 Feature Ids.
 * @{
 */
const uint32_t kFeatureIdBufSizeBounded   =  0;
const uint32_t kFeatureIdBufSizeFixed     =  1;
const uint32_t kFeatureIdBufSizePowerOf2  =  2;
const uint32_t kFeatureIdEvent            =  3;
const uint32_t kFeatureIdLogs             =  4;
const uint32_t kFeatureIdOptions          =  5;
const uint32_t kFeatureIdPrograms         =  6;
const uint32_t kFeatureIdRtMemPool        =  7;
const uint32_t kFeatureIdStateMakePath    =  8;
const uint32_t kFeatureIdStateMapPath     =  9;
const uint32_t kFeatureIdStrictBounds     = 10;
const uint32_t kFeatureIdUriMap           = 11;
const uint32_t kFeatureIdUridMap          = 12;
const uint32_t kFeatureIdUridUnmap        = 13;
const uint32_t kFeatureIdWorker           = 14;
const uint32_t kFeatureIdUiDataAccess     = 15;
const uint32_t kFeatureIdUiInstanceAccess = 16;
const uint32_t kFeatureIdUiParent         = 17;
const uint32_t kFeatureIdUiPortMap        = 18;
const uint32_t kFeatureIdUiResize         = 19;
const uint32_t kFeatureIdExternalUi       = 20;
const uint32_t kFeatureIdExternalUiOld    = 21;
const uint32_t kFeatureCount              = 22;
/**@}*/

struct Lv2EventData {
    uint32_t type;
    uint32_t rindex;
    CarlaEngineEventPort* port;
    union {
        LV2_Atom_Sequence* atom;
        LV2_Event_Buffer* event;
        LV2_MIDI* midi;
    };

    Lv2EventData()
        : type(0x0),
          rindex(0),
          port(nullptr) {}

    ~Lv2EventData()
    {
        CARLA_ASSERT(port == nullptr);
    }

    CARLA_DECLARE_NON_COPY_STRUCT_WITH_LEAK_DETECTOR(Lv2EventData)
};

struct Lv2PluginEventData {
    uint32_t count;
    Lv2EventData* data;

    Lv2PluginEventData()
        : count(0),
          data(nullptr) {}

    ~Lv2PluginEventData()
    {
        CARLA_ASSERT_INT(count == 0, count);
        CARLA_ASSERT(data == nullptr);
    }

    void createNew(const uint32_t newCount)
    {
        CARLA_ASSERT_INT(count == 0, count);
        CARLA_ASSERT(data == nullptr);
        CARLA_ASSERT_INT(newCount > 0, newCount);

        if (data != nullptr || newCount == 0)
            return;

        data  = new Lv2EventData[newCount];
        count = newCount;
    }

    void clear()
    {
        if (data != nullptr)
        {
            for (uint32_t i=0; i < count; ++i)
            {
                if (data[i].port != nullptr)
                {
                    delete data[i].port;
                    data[i].port = nullptr;
                }
            }

            delete[] data;
            data = nullptr;
        }

        count = 0;
    }

    void initBuffers(CarlaEngine* const engine)
    {
        for (uint32_t i=0; i < count; ++i)
        {
            if (data[i].port != nullptr)
                data[i].port->initBuffer(engine);
        }
    }

    CARLA_DECLARE_NON_COPY_STRUCT_WITH_LEAK_DETECTOR(Lv2PluginEventData)
};

LV2_Atom_Event* getLv2AtomEvent(LV2_Atom_Sequence* const atom, const uint32_t offset)
{
    return (LV2_Atom_Event*)((char*)LV2_ATOM_CONTENTS(LV2_Atom_Sequence, atom) + offset);
}

// -----------------------------------------------------

class Lv2Plugin : public CarlaPlugin,
                  public CarlaPluginGui::Callback
{
public:
    Lv2Plugin(CarlaEngine* const engine, const unsigned int id)
        : CarlaPlugin(engine, id),
          fHandle(nullptr),
          fHandle2(nullptr),
          fFeatures{nullptr},
          fDescriptor(nullptr),
          fRdfDescriptor(nullptr),
          fAudioInBuffers(nullptr),
          fAudioOutBuffers(nullptr),
          fParamBuffers(nullptr)
    {
        carla_debug("Lv2Plugin::Lv2Plugin(%p, %i)", engine, id);

        kData->osc.thread.setMode(CarlaPluginThread::PLUGIN_THREAD_LV2_GUI);
    }

    ~Lv2Plugin() override
    {
        carla_debug("Lv2Plugin::~Lv2Plugin()");

        // close UI
        if (fHints & PLUGIN_HAS_GUI)
        {
            showGui(false);

            //if (fGui.isOsc)
            {
                // Wait a bit first, then force kill
                if (kData->osc.thread.isRunning() && ! kData->osc.thread.wait(kData->engine->getOptions().oscUiTimeout))
                {
                    carla_stderr("LV2 OSC-GUI thread still running, forcing termination now");
                    kData->osc.thread.terminate();
                }
            }

            if (fUi.descriptor != nullptr)
            {
                if (fUi.descriptor->cleanup != nullptr && fUi.handle != nullptr)
                    fUi.descriptor->cleanup(fUi.handle);

                fUi.handle     = nullptr;
                fUi.descriptor = nullptr;
            }

            if (fFeatures[kFeatureIdUiDataAccess] != nullptr && fFeatures[kFeatureIdUiDataAccess]->data != nullptr)
                delete (LV2_Extension_Data_Feature*)fFeatures[kFeatureIdUiDataAccess]->data;

            if (fFeatures[kFeatureIdUiPortMap] != nullptr && fFeatures[kFeatureIdUiPortMap]->data != nullptr)
                delete (LV2UI_Port_Map*)fFeatures[kFeatureIdUiPortMap]->data;

            if (fFeatures[kFeatureIdUiResize] != nullptr && fFeatures[kFeatureIdUiResize]->data != nullptr)
                delete (LV2UI_Resize*)fFeatures[kFeatureIdUiResize]->data;

            if (fFeatures[kFeatureIdExternalUi] != nullptr && fFeatures[kFeatureIdExternalUi]->data != nullptr)
            {
                const LV2_External_UI_Host* const uiHost((const LV2_External_UI_Host*)fFeatures[kFeatureIdExternalUi]->data);

                if (uiHost->plugin_human_id != nullptr)
                    delete[] uiHost->plugin_human_id;

                delete uiHost;
            }

            kData->uiLibClose();
        }

        kData->singleMutex.lock();
        kData->masterMutex.lock();

        if (kData->active)
        {
            deactivate();
            kData->active = false;
        }

        if (fDescriptor != nullptr)
        {
            if (fDescriptor->cleanup != nullptr)
            {
                if (fHandle != nullptr)
                    fDescriptor->cleanup(fHandle);
                if (fHandle2 != nullptr)
                    fDescriptor->cleanup(fHandle2);
            }

            fHandle  = nullptr;
            fHandle2 = nullptr;
            fDescriptor = nullptr;
        }

        if (fRdfDescriptor != nullptr)
        {
            delete fRdfDescriptor;
            fRdfDescriptor = nullptr;
        }

        if (fFeatures[kFeatureIdPrograms] != nullptr && fFeatures[kFeatureIdPrograms]->data != nullptr)
            delete (LV2_Programs_Host*)fFeatures[kFeatureIdPrograms]->data;

        if (fFeatures[kFeatureIdUriMap] != nullptr && fFeatures[kFeatureIdUriMap]->data != nullptr)
            delete (LV2_URI_Map_Feature*)fFeatures[kFeatureIdUriMap]->data;

        if (fFeatures[kFeatureIdUridMap] != nullptr && fFeatures[kFeatureIdUridMap]->data != nullptr)
            delete (LV2_URID_Map*)fFeatures[kFeatureIdUridMap]->data;

        if (fFeatures[kFeatureIdUridUnmap] != nullptr && fFeatures[kFeatureIdUridUnmap]->data != nullptr)
            delete (LV2_URID_Unmap*)fFeatures[kFeatureIdUridUnmap]->data;

        if (fFeatures[kFeatureIdWorker] != nullptr && fFeatures[kFeatureIdWorker]->data != nullptr)
            delete (LV2_Worker_Schedule*)fFeatures[kFeatureIdWorker]->data;

        for (uint32_t i=0; i < kFeatureCount; ++i)
        {
            if (fFeatures[i] != nullptr)
                delete fFeatures[i];
        }

        clearBuffers();
    }

    // -------------------------------------------------------------------
    // Information (base)

    PluginType type() const override
    {
        return PLUGIN_LV2;
    }

    PluginCategory category() override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);

        const LV2_Property cat1(fRdfDescriptor->Type[0]);
        const LV2_Property cat2(fRdfDescriptor->Type[1]);

        if (LV2_IS_DELAY(cat1, cat2))
            return PLUGIN_CATEGORY_DELAY;
        if (LV2_IS_DISTORTION(cat1, cat2))
            return PLUGIN_CATEGORY_OTHER;
        if (LV2_IS_DYNAMICS(cat1, cat2))
            return PLUGIN_CATEGORY_DYNAMICS;
        if (LV2_IS_EQ(cat1, cat2))
            return PLUGIN_CATEGORY_EQ;
        if (LV2_IS_FILTER(cat1, cat2))
            return PLUGIN_CATEGORY_FILTER;
        if (LV2_IS_GENERATOR(cat1, cat2))
            return PLUGIN_CATEGORY_SYNTH;
        if (LV2_IS_MODULATOR(cat1, cat2))
            return PLUGIN_CATEGORY_MODULATOR;
        if (LV2_IS_REVERB(cat1, cat2))
            return PLUGIN_CATEGORY_DELAY;
        if (LV2_IS_SIMULATOR(cat1, cat2))
            return PLUGIN_CATEGORY_OTHER;
        if (LV2_IS_SPATIAL(cat1, cat2))
            return PLUGIN_CATEGORY_OTHER;
        if (LV2_IS_SPECTRAL(cat1, cat2))
            return PLUGIN_CATEGORY_UTILITY;
        if (LV2_IS_UTILITY(cat1, cat2))
            return PLUGIN_CATEGORY_UTILITY;

        return getPluginCategoryFromName(fName);
    }

    long uniqueId() const override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);

        return fRdfDescriptor->UniqueID;
    }

    // -------------------------------------------------------------------
    // Information (count)

    uint32_t midiInCount() const override
    {
        uint32_t i, count = 0;

        for (i=0; i < fEventsIn.count; ++i)
        {
            if (fEventsIn.data[i].type & CARLA_EVENT_TYPE_MIDI)
                count += 1;
        }

        return count;
    }

    uint32_t midiOutCount() const override
    {
        uint32_t i, count = 0;

        for (i=0; i < fEventsOut.count; ++i)
        {
            if (fEventsOut.data[i].type & CARLA_EVENT_TYPE_MIDI)
                count += 1;
        }

        return count;
    }

    uint32_t parameterScalePointCount(const uint32_t parameterId) const override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);
        CARLA_ASSERT(parameterId < kData->param.count);

        const int32_t rindex(kData->param.data[parameterId].rindex);

        if (rindex < static_cast<int32_t>(fRdfDescriptor->PortCount))
        {
            const LV2_RDF_Port& port(fRdfDescriptor->Ports[rindex]);
            return port.ScalePointCount;
        }

        return 0;
    }

    // -------------------------------------------------------------------
    // Information (current data)

    // nothing

    // -------------------------------------------------------------------
    // Information (per-plugin data)

    unsigned int availableOptions() override
    {
        unsigned int options = 0x0;

        options |= PLUGIN_OPTION_FIXED_BUFFER;
        options |= PLUGIN_OPTION_MAP_PROGRAM_CHANGES;

        if (kData->engine->getProccessMode() != PROCESS_MODE_CONTINUOUS_RACK)
        {
            if (fOptions & PLUGIN_OPTION_FORCE_STEREO)
                options |= PLUGIN_OPTION_FORCE_STEREO;
            else if (kData->audioIn.count <= 1 && kData->audioOut.count <= 1 && (kData->audioIn.count != 0 || kData->audioOut.count != 0))
                options |= PLUGIN_OPTION_FORCE_STEREO;
        }

        //if (fDescriptor->midiIns > 0)
        {
            options |= PLUGIN_OPTION_SEND_CONTROL_CHANGES;
            options |= PLUGIN_OPTION_SEND_CHANNEL_PRESSURE;
            options |= PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH;
            options |= PLUGIN_OPTION_SEND_PITCHBEND;
            options |= PLUGIN_OPTION_SEND_ALL_SOUND_OFF;
        }

        return options;
    }

    float getParameterValue(const uint32_t parameterId) override
    {
        CARLA_ASSERT(fParamBuffers != nullptr);
        CARLA_ASSERT(parameterId < kData->param.count);

        return fParamBuffers[parameterId];
    }

    float getParameterScalePointValue(const uint32_t parameterId, const uint32_t scalePointId) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);
        CARLA_ASSERT(parameterId < kData->param.count);
        CARLA_ASSERT(scalePointId < parameterScalePointCount(parameterId));

        const int32_t rindex(kData->param.data[parameterId].rindex);

        if (rindex < static_cast<int32_t>(fRdfDescriptor->PortCount))
        {
            const LV2_RDF_Port& port(fRdfDescriptor->Ports[rindex]);

            if (scalePointId < port.ScalePointCount)
            {
                const LV2_RDF_PortScalePoint& portScalePoint(port.ScalePoints[scalePointId]);
                return portScalePoint.Value;
            }
        }

        return 0.0f;
    }

    void getLabel(char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);
        CARLA_ASSERT(fRdfDescriptor->URI != nullptr);

        if (fRdfDescriptor->URI != nullptr)
            std::strncpy(strBuf, fRdfDescriptor->URI, STR_MAX);
        else
            CarlaPlugin::getLabel(strBuf);
    }

    void getMaker(char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);

        if (fRdfDescriptor->Author != nullptr)
            std::strncpy(strBuf, fRdfDescriptor->Author, STR_MAX);
        else
            CarlaPlugin::getMaker(strBuf);
    }

    void getCopyright(char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);

        if (fRdfDescriptor->License != nullptr)
            std::strncpy(strBuf, fRdfDescriptor->License, STR_MAX);
        else
            CarlaPlugin::getCopyright(strBuf);
    }

    void getRealName(char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);

        if (fRdfDescriptor->Name != nullptr)
            std::strncpy(strBuf, fRdfDescriptor->Name, STR_MAX);
        else
            CarlaPlugin::getRealName(strBuf);
    }

    void getParameterName(const uint32_t parameterId, char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);
        CARLA_ASSERT(parameterId < kData->param.count);

        const int32_t rindex(kData->param.data[parameterId].rindex);

        if (rindex < static_cast<int32_t>(fRdfDescriptor->PortCount))
            std::strncpy(strBuf, fRdfDescriptor->Ports[rindex].Name, STR_MAX);
        else
            CarlaPlugin::getParameterName(parameterId, strBuf);
    }

    void getParameterSymbol(const uint32_t parameterId, char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);
        CARLA_ASSERT(parameterId < kData->param.count);

        const int32_t rindex(kData->param.data[parameterId].rindex);

        if (rindex < static_cast<int32_t>(fRdfDescriptor->PortCount))
            strncpy(strBuf, fRdfDescriptor->Ports[rindex].Symbol, STR_MAX);
        else
            CarlaPlugin::getParameterSymbol(parameterId, strBuf);
    }

    void getParameterUnit(const uint32_t parameterId, char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);
        CARLA_ASSERT(parameterId < kData->param.count);

        const int32_t rindex(kData->param.data[parameterId].rindex);

        if (rindex < static_cast<int32_t>(fRdfDescriptor->PortCount))
        {
            const LV2_RDF_Port& port(fRdfDescriptor->Ports[rindex]);

            if (LV2_HAVE_PORT_UNIT_SYMBOL(port.Unit.Hints) && port.Unit.Symbol)
                std::strncpy(strBuf, port.Unit.Symbol, STR_MAX);

            else if (LV2_HAVE_PORT_UNIT_UNIT(port.Unit.Hints))
            {
                switch (port.Unit.Unit)
                {
                case LV2_PORT_UNIT_BAR:
                    std::strncpy(strBuf, "bars", STR_MAX);
                    return;
                case LV2_PORT_UNIT_BEAT:
                    std::strncpy(strBuf, "beats", STR_MAX);
                    return;
                case LV2_PORT_UNIT_BPM:
                    std::strncpy(strBuf, "BPM", STR_MAX);
                    return;
                case LV2_PORT_UNIT_CENT:
                    std::strncpy(strBuf, "ct", STR_MAX);
                    return;
                case LV2_PORT_UNIT_CM:
                    std::strncpy(strBuf, "cm", STR_MAX);
                    return;
                case LV2_PORT_UNIT_COEF:
                    std::strncpy(strBuf, "(coef)", STR_MAX);
                    return;
                case LV2_PORT_UNIT_DB:
                    std::strncpy(strBuf, "dB", STR_MAX);
                    return;
                case LV2_PORT_UNIT_DEGREE:
                    std::strncpy(strBuf, "deg", STR_MAX);
                    return;
                case LV2_PORT_UNIT_FRAME:
                    std::strncpy(strBuf, "frames", STR_MAX);
                    return;
                case LV2_PORT_UNIT_HZ:
                    std::strncpy(strBuf, "Hz", STR_MAX);
                    return;
                case LV2_PORT_UNIT_INCH:
                    std::strncpy(strBuf, "in", STR_MAX);
                    return;
                case LV2_PORT_UNIT_KHZ:
                    std::strncpy(strBuf, "kHz", STR_MAX);
                    return;
                case LV2_PORT_UNIT_KM:
                    std::strncpy(strBuf, "km", STR_MAX);
                    return;
                case LV2_PORT_UNIT_M:
                    std::strncpy(strBuf, "m", STR_MAX);
                    return;
                case LV2_PORT_UNIT_MHZ:
                    std::strncpy(strBuf, "MHz", STR_MAX);
                    return;
                case LV2_PORT_UNIT_MIDINOTE:
                    std::strncpy(strBuf, "note", STR_MAX);
                    return;
                case LV2_PORT_UNIT_MILE:
                    std::strncpy(strBuf, "mi", STR_MAX);
                    return;
                case LV2_PORT_UNIT_MIN:
                    std::strncpy(strBuf, "min", STR_MAX);
                    return;
                case LV2_PORT_UNIT_MM:
                    std::strncpy(strBuf, "mm", STR_MAX);
                    return;
                case LV2_PORT_UNIT_MS:
                    std::strncpy(strBuf, "ms", STR_MAX);
                    return;
                case LV2_PORT_UNIT_OCT:
                    std::strncpy(strBuf, "oct", STR_MAX);
                    return;
                case LV2_PORT_UNIT_PC:
                    std::strncpy(strBuf, "%", STR_MAX);
                    return;
                case LV2_PORT_UNIT_S:
                    std::strncpy(strBuf, "s", STR_MAX);
                    return;
                case LV2_PORT_UNIT_SEMITONE:
                    std::strncpy(strBuf, "semi", STR_MAX);
                    return;
                }
            }
        }

        CarlaPlugin::getParameterUnit(parameterId, strBuf);
    }

    void getParameterScalePointLabel(const uint32_t parameterId, const uint32_t scalePointId, char* const strBuf) override
    {
        CARLA_ASSERT(fRdfDescriptor != nullptr);
        CARLA_ASSERT(parameterId < kData->param.count);
        CARLA_ASSERT(scalePointId < parameterScalePointCount(parameterId));

        const int32_t rindex(kData->param.data[parameterId].rindex);

        if (rindex < static_cast<int32_t>(fRdfDescriptor->PortCount))
        {
            const LV2_RDF_Port& port(fRdfDescriptor->Ports[rindex]);

            if (scalePointId < port.ScalePointCount)
            {
                const LV2_RDF_PortScalePoint& portScalePoint(port.ScalePoints[scalePointId]);

                if (portScalePoint.Label != nullptr)
                {
                    std::strncpy(strBuf, portScalePoint.Label, STR_MAX);
                    return;
                }
            }
        }

        CarlaPlugin::getParameterScalePointLabel(parameterId, scalePointId, strBuf);
    }

    // -------------------------------------------------------------------
    // Set data (state)

    void prepareForSave() override
    {
        CARLA_ASSERT(fHandle != nullptr);

        if (fExt.state != nullptr && fExt.state->save != nullptr)
        {
            //fExt.state->save(handle, carla_lv2_state_store, this, LV2_STATE_IS_POD, features);

            //if (fHandle2)
            //    fExt.state->save(h2, carla_lv2_state_store, this, LV2_STATE_IS_POD, features);
        }
    }

    // -------------------------------------------------------------------
    // Set data (internal stuff)

    // nothing

    // -------------------------------------------------------------------
    // Set data (plugin-specific stuff)

    void setParameterValue(const uint32_t parameterId, const float value, const bool sendGui, const bool sendOsc, const bool sendCallback) override
    {
        CARLA_ASSERT(parameterId < kData->param.count);

        const float fixedValue(kData->param.fixValue(parameterId, value));
        fParamBuffers[parameterId] = fixedValue;

        CarlaPlugin::setParameterValue(parameterId, fixedValue, sendGui, sendOsc, sendCallback);
    }

    // -------------------------------------------------------------------
    // Set gui stuff

    void showGui(const bool yesNo) override
    {
        if (true)
        {
            if (yesNo)
            {
                kData->osc.thread.start();
            }
            else
            {
                if (kData->osc.data.target != nullptr)
                {
                    osc_send_hide(&kData->osc.data);
                    osc_send_quit(&kData->osc.data);
                    kData->osc.data.free();
                }

                if (kData->osc.thread.isRunning() && ! kData->osc.thread.wait(kData->engine->getOptions().oscUiTimeout))
                    kData->osc.thread.terminate();
            }
        }
        else
        {
            if (yesNo)
            {
                if (kData->gui == nullptr)
                {
                    // TODO
                    CarlaPluginGui::Options guiOptions;
                    guiOptions.parented  = false;
                    guiOptions.resizable = true;

                    kData->gui = new CarlaPluginGui(kData->engine, this, guiOptions);
                }

                //void* const ptr = kData->gui->getContainerWinId();

                // open
                if (true)
                {
                    kData->gui->setWindowTitle(QString("%1 (GUI)").arg((const char*)fName).toUtf8().constData());
                    kData->gui->show();
                }
                else
                {
                    if (kData->gui != nullptr)
                    {
                        kData->gui->close();
                        delete kData->gui;
                        kData->gui = nullptr;
                    }

                    kData->engine->callback(CALLBACK_ERROR, fId, 0, 0, 0.0f, "Plugin refused to open its own UI");
                    kData->engine->callback(CALLBACK_SHOW_GUI, fId, 0, 0, 0.0f, nullptr);
                    return;
                }
            }
            else
            {
                // close here

                if (kData->gui != nullptr)
                {
                    kData->gui->close();
                    delete kData->gui;
                    kData->gui = nullptr;
                }
            }
        }

        //fGui.isVisible = yesNo;
    }

    void idleGui() override
    {
        CarlaPlugin::idleGui();
    }

    // -------------------------------------------------------------------
    // Plugin processing

    void activate() override
    {
        CARLA_ASSERT(fDescriptor != nullptr);

        if (fDescriptor->activate != nullptr)
        {
            fDescriptor->activate(fHandle);

            if (fHandle2 != nullptr)
                fDescriptor->activate(fHandle2);
        }
    }

    void deactivate() override
    {
        CARLA_ASSERT(fDescriptor != nullptr);

        if (fDescriptor->deactivate != nullptr)
        {
            fDescriptor->deactivate(fHandle);

            if (fHandle2 != nullptr)
                fDescriptor->deactivate(fHandle2);
        }
    }

    void bufferSizeChanged(const uint32_t newBufferSize) override
    {
        CARLA_ASSERT_INT(newBufferSize > 0, newBufferSize);
        carla_debug("Lv2Plugin::bufferSizeChanged(%i) - start", newBufferSize);

        for (uint32_t i=0; i < kData->audioIn.count; ++i)
        {
            if (fAudioInBuffers[i] != nullptr)
                delete[] fAudioInBuffers[i];
            fAudioInBuffers[i] = new float[newBufferSize];
        }

        for (uint32_t i=0; i < kData->audioOut.count; ++i)
        {
            if (fAudioOutBuffers[i] != nullptr)
                delete[] fAudioOutBuffers[i];
            fAudioOutBuffers[i] = new float[newBufferSize];
        }

        if (fHandle2 == nullptr)
        {
            for (uint32_t i=0; i < kData->audioIn.count; ++i)
            {
                CARLA_ASSERT(fAudioInBuffers[i] != nullptr);
                fDescriptor->connect_port(fHandle, kData->audioIn.ports[i].rindex, fAudioInBuffers[i]);
            }

            for (uint32_t i=0; i < kData->audioOut.count; ++i)
            {
                CARLA_ASSERT(fAudioOutBuffers[i] != nullptr);
                fDescriptor->connect_port(fHandle, kData->audioOut.ports[i].rindex, fAudioOutBuffers[i]);
            }
        }
        else
        {
            if (kData->audioIn.count > 0)
            {
                CARLA_ASSERT(kData->audioIn.count == 2);
                CARLA_ASSERT(fAudioInBuffers[0] != nullptr);
                CARLA_ASSERT(fAudioInBuffers[1] != nullptr);

                fDescriptor->connect_port(fHandle,  kData->audioIn.ports[0].rindex, fAudioInBuffers[0]);
                fDescriptor->connect_port(fHandle2, kData->audioIn.ports[1].rindex, fAudioInBuffers[1]);
            }

            if (kData->audioOut.count > 0)
            {
                CARLA_ASSERT(kData->audioOut.count == 2);
                CARLA_ASSERT(fAudioOutBuffers[0] != nullptr);
                CARLA_ASSERT(fAudioOutBuffers[1] != nullptr);

                fDescriptor->connect_port(fHandle,  kData->audioOut.ports[0].rindex, fAudioOutBuffers[0]);
                fDescriptor->connect_port(fHandle2, kData->audioOut.ports[1].rindex, fAudioOutBuffers[1]);
            }
        }

        carla_debug("Lv2Plugin::bufferSizeChanged(%i) - end", newBufferSize);
    }

    void sampleRateChanged(const double newSampleRate) override
    {
        CARLA_ASSERT_INT(newSampleRate > 0.0, newSampleRate);
        carla_debug("Lv2Plugin::sampleRateChanged(%g) - start", newSampleRate);

        // TODO
        (void)newSampleRate;

        carla_debug("Lv2Plugin::sampleRateChanged(%g) - end", newSampleRate);
    }

    // -------------------------------------------------------------------
    // Plugin buffers

    void clearBuffers() override
    {
        carla_debug("Lv2Plugin::clearBuffers() - start");

        if (fAudioInBuffers != nullptr)
        {
            for (uint32_t i=0; i < kData->audioIn.count; ++i)
            {
                if (fAudioInBuffers[i] != nullptr)
                {
                    delete[] fAudioInBuffers[i];
                    fAudioInBuffers[i] = nullptr;
                }
            }

            delete[] fAudioInBuffers;
            fAudioInBuffers = nullptr;
        }

        if (fAudioOutBuffers != nullptr)
        {
            for (uint32_t i=0; i < kData->audioOut.count; ++i)
            {
                if (fAudioOutBuffers[i] != nullptr)
                {
                    delete[] fAudioOutBuffers[i];
                    fAudioOutBuffers[i] = nullptr;
                }
            }

            delete[] fAudioOutBuffers;
            fAudioOutBuffers = nullptr;
        }

        if (fParamBuffers != nullptr)
        {
            delete[] fParamBuffers;
            fParamBuffers = nullptr;
        }

        CarlaPlugin::clearBuffers();

        carla_debug("Lv2Plugin::clearBuffers() - end");
    }

    // -------------------------------------------------------------------
    // Post-poned UI Stuff

    // -------------------------------------------------------------------

protected:
    void guiClosedCallback() override
    {
        showGui(false);
        kData->engine->callback(CALLBACK_SHOW_GUI, fId, 0, 0, 0.0f, nullptr);
    }

    // -------------------------------------------------------------------

public:
    bool init(const char* const bundle, const char* const name, const char* const uri)
    {
        CARLA_ASSERT(kData->engine != nullptr);
        CARLA_ASSERT(kData->client == nullptr);
        CARLA_ASSERT(bundle != nullptr);
        CARLA_ASSERT(uri != nullptr);

        // ---------------------------------------------------------------
        // first checks

        if (kData->engine == nullptr)
        {
            return false;
        }

        if (kData->client != nullptr)
        {
            kData->engine->setLastError("Plugin client is already registered");
            return false;
        }

        if (bundle == nullptr)
        {
            kData->engine->setLastError("null bundle");
            return false;
        }

        if (uri == nullptr)
        {
            kData->engine->setLastError("null uri");
            return false;
        }

        // ---------------------------------------------------------------
        // get plugin from lv2_rdf (lilv)

        gLv2World.init();

        fRdfDescriptor = lv2_rdf_new(uri);

        if (fRdfDescriptor == nullptr)
        {
            kData->engine->setLastError("Failed to find the requested plugin in the LV2 Bundle");
            return false;
        }

        // ---------------------------------------------------------------
        // open DLL

        if (! kData->libOpen(fRdfDescriptor->Binary))
        {
            kData->engine->setLastError(kData->libError(fRdfDescriptor->Binary));
            return false;
        }

        // ---------------------------------------------------------------
        // initialize features (part 1)

        LV2_Event_Feature* const eventFt = new LV2_Event_Feature;
        eventFt->callback_data           = this;
        eventFt->lv2_event_ref           = carla_lv2_event_ref;
        eventFt->lv2_event_unref         = carla_lv2_event_unref;

        LV2_Log_Log* const logFt         = new LV2_Log_Log;
        logFt->handle                    = this;
        logFt->printf                    = carla_lv2_log_printf;
        logFt->vprintf                   = carla_lv2_log_vprintf;

        LV2_State_Make_Path* const stateMakePathFt = new LV2_State_Make_Path;
        stateMakePathFt->handle                    = this;
        stateMakePathFt->path                      = carla_lv2_state_make_path;

        LV2_State_Map_Path* const stateMapPathFt   = new LV2_State_Map_Path;
        stateMapPathFt->handle                     = this;
        stateMapPathFt->abstract_path              = carla_lv2_state_map_abstract_path;
        stateMapPathFt->absolute_path              = carla_lv2_state_map_absolute_path;

        LV2_Programs_Host* const programsFt   = new LV2_Programs_Host;
        programsFt->handle                    = this;
        programsFt->program_changed           = carla_lv2_program_changed;

        LV2_RtMemPool_Pool* const rtMemPoolFt = new LV2_RtMemPool_Pool;
        lv2_rtmempool_init(rtMemPoolFt);

        LV2_URI_Map_Feature* const uriMapFt = new LV2_URI_Map_Feature;
        uriMapFt->callback_data             = this;
        uriMapFt->uri_to_id                 = carla_lv2_uri_to_id;

        LV2_URID_Map* const uridMapFt       = new LV2_URID_Map;
        uridMapFt->handle                   = this;
        uridMapFt->map                      = carla_lv2_urid_map;

        LV2_URID_Unmap* const uridUnmapFt   = new LV2_URID_Unmap;
        uridUnmapFt->handle                 = this;
        uridUnmapFt->unmap                  = carla_lv2_urid_unmap;

        LV2_Worker_Schedule* const workerFt = new LV2_Worker_Schedule;
        workerFt->handle                    = this;
        workerFt->schedule_work             = carla_lv2_worker_schedule;

        // ---------------------------------------------------------------
        // initialize features (part 2)

        fFeatures[kFeatureIdBufSizeBounded]       = new LV2_Feature;
        fFeatures[kFeatureIdBufSizeBounded]->URI  = LV2_BUF_SIZE__boundedBlockLength;
        fFeatures[kFeatureIdBufSizeBounded]->data = nullptr;

        fFeatures[kFeatureIdBufSizeFixed]          = new LV2_Feature;
        fFeatures[kFeatureIdBufSizeFixed]->URI     = LV2_BUF_SIZE__fixedBlockLength;
        fFeatures[kFeatureIdBufSizeFixed]->data    = nullptr;

        fFeatures[kFeatureIdBufSizePowerOf2]       = new LV2_Feature;
        fFeatures[kFeatureIdBufSizePowerOf2]->URI  = LV2_BUF_SIZE__powerOf2BlockLength;
        fFeatures[kFeatureIdBufSizePowerOf2]->data = nullptr;

        fFeatures[kFeatureIdEvent]          = new LV2_Feature;
        fFeatures[kFeatureIdEvent]->URI     = LV2_EVENT_URI;
        fFeatures[kFeatureIdEvent]->data    = eventFt;

        fFeatures[kFeatureIdLogs]           = new LV2_Feature;
        fFeatures[kFeatureIdLogs]->URI      = LV2_LOG__log;
        fFeatures[kFeatureIdLogs]->data     = logFt;

        fFeatures[kFeatureIdOptions]        = new LV2_Feature;
        fFeatures[kFeatureIdOptions]->URI   = LV2_OPTIONS__options;
        //fFeatures[kFeatureIdOptions]->data  = ft.options;

        fFeatures[kFeatureIdPrograms]       = new LV2_Feature;
        fFeatures[kFeatureIdPrograms]->URI  = LV2_PROGRAMS__Host;
        fFeatures[kFeatureIdPrograms]->data = programsFt;

        fFeatures[kFeatureIdRtMemPool]       = new LV2_Feature;
        fFeatures[kFeatureIdRtMemPool]->URI  = LV2_RTSAFE_MEMORY_POOL__Pool;
        fFeatures[kFeatureIdRtMemPool]->data = rtMemPoolFt;

        fFeatures[kFeatureIdStateMakePath]       = new LV2_Feature;
        fFeatures[kFeatureIdStateMakePath]->URI  = LV2_STATE__makePath;
        fFeatures[kFeatureIdStateMakePath]->data = stateMakePathFt;

        fFeatures[kFeatureIdStateMapPath]        = new LV2_Feature;
        fFeatures[kFeatureIdStateMapPath]->URI   = LV2_STATE__mapPath;
        fFeatures[kFeatureIdStateMapPath]->data  = stateMapPathFt;

        fFeatures[kFeatureIdStrictBounds]         = new LV2_Feature;
        fFeatures[kFeatureIdStrictBounds]->URI    = LV2_PORT_PROPS__supportsStrictBounds;
        fFeatures[kFeatureIdStrictBounds]->data   = nullptr;

        fFeatures[kFeatureIdUriMap]          = new LV2_Feature;
        fFeatures[kFeatureIdUriMap]->URI     = LV2_URI_MAP_URI;
        fFeatures[kFeatureIdUriMap]->data    = uriMapFt;

        fFeatures[kFeatureIdUridMap]         = new LV2_Feature;
        fFeatures[kFeatureIdUridMap]->URI    = LV2_URID__map;
        fFeatures[kFeatureIdUridMap]->data   = uridMapFt;

        fFeatures[kFeatureIdUridUnmap]       = new LV2_Feature;
        fFeatures[kFeatureIdUridUnmap]->URI  = LV2_URID__unmap;
        fFeatures[kFeatureIdUridUnmap]->data = uridUnmapFt;

        fFeatures[kFeatureIdWorker]           = new LV2_Feature;
        fFeatures[kFeatureIdWorker]->URI      = LV2_WORKER__schedule;
        fFeatures[kFeatureIdWorker]->data     = workerFt;

        // ---------------------------------------------------------------
        // get DLL main entry

#if 0
        const LV2_Lib_Descriptor_Function libDescFn = (LV2_Lib_Descriptor_Function)kData->libSymbol("lv2_lib_descriptor");

        if (libDescFn != nullptr)
        {
            // -----------------------------------------------------------
            // get lib descriptor

            const LV2_Lib_Descriptor* libFn = nullptr; //descLibFn(fRdfDescriptor->Bundle, features);

            if (libFn == nullptr || libFn->get_plugin == nullptr)
            {
                kData->engine->setLastError("Plugin failed to return library descriptor");
                return false;
            }

            // -----------------------------------------------------------
            // get descriptor that matches URI

            uint32_t i = 0;
            while ((fDescriptor = libFn->get_plugin(libFn->handle, i++)))
            {
                if (std::strcmp(fDescriptor->URI, uri) == 0)
                    break;
            }

            if (fDescriptor == nullptr)
                libFn->cleanup(libFn->handle);
        else
#endif
        {
            const LV2_Descriptor_Function descFn = (LV2_Descriptor_Function)kData->libSymbol("lv2_descriptor");

            if (descFn == nullptr)
            {
                kData->engine->setLastError("Could not find the LV2 Descriptor in the plugin library");
                return false;
            }

            // -----------------------------------------------------------
            // get descriptor that matches URI

            uint32_t i = 0;
            while ((fDescriptor = descFn(i++)))
            {
                if (std::strcmp(fDescriptor->URI, uri) == 0)
                    break;
            }
        }

        if (fDescriptor == nullptr)
        {
            kData->engine->setLastError("Could not find the requested plugin URI in the plugin library");
            return false;
        }

        // ---------------------------------------------------------------
        // check supported port-types and features

        bool canContinue = true;

        // Check supported ports
        for (uint32_t i=0; i < fRdfDescriptor->PortCount; ++i)
        {
            const LV2_Property portTypes(fRdfDescriptor->Ports[i].Types);

            if (! (LV2_IS_PORT_AUDIO(portTypes) || LV2_IS_PORT_CONTROL(portTypes) || LV2_IS_PORT_ATOM_SEQUENCE(portTypes) || LV2_IS_PORT_EVENT(portTypes) || LV2_IS_PORT_MIDI_LL(portTypes)))
            {
                if (! LV2_IS_PORT_OPTIONAL(fRdfDescriptor->Ports[i].Properties))
                {
                    kData->engine->setLastError("Plugin requires a port type that is not currently supported");
                    canContinue = false;
                    break;
                }
            }
        }

        // Check supported features
        for (uint32_t i=0; i < fRdfDescriptor->FeatureCount && canContinue; ++i)
        {
            if (LV2_IS_FEATURE_REQUIRED(fRdfDescriptor->Features[i].Type) && ! is_lv2_feature_supported(fRdfDescriptor->Features[i].URI))
            {
                QString msg(QString("Plugin requires a feature that is not supported:\n%1").arg(fRdfDescriptor->Features[i].URI));
                kData->engine->setLastError(msg.toUtf8().constData());
                canContinue = false;
                break;
            }
        }

        // Check extensions
        for (uint32_t i=0; i < fRdfDescriptor->ExtensionCount; ++i)
        {
            if (std::strcmp(fRdfDescriptor->Extensions[i], LV2_PROGRAMS__Interface) == 0)
                fHints |= PLUGIN_HAS_EXTENSION_PROGRAMS;
            else if (std::strcmp(fRdfDescriptor->Extensions[i], LV2_STATE__interface) == 0)
                fHints |= PLUGIN_HAS_EXTENSION_STATE;
            else if (std::strcmp(fRdfDescriptor->Extensions[i], LV2_WORKER__interface) == 0)
                fHints |= PLUGIN_HAS_EXTENSION_WORKER;
            else
                carla_stdout("Plugin has non-supported extension: '%s'", fRdfDescriptor->Extensions[i]);
        }

        if (! canContinue)
        {
            // error already set
            return false;
        }

        // ---------------------------------------------------------------
        // get info

        if (name != nullptr)
            fName = kData->engine->getUniquePluginName(name);
        else
            fName = kData->engine->getUniquePluginName(fRdfDescriptor->Name);

        fFilename = bundle;

        // ---------------------------------------------------------------
        // register client

        kData->client = kData->engine->addClient(this);

        if (kData->client == nullptr || ! kData->client->isOk())
        {
            kData->engine->setLastError("Failed to register plugin client");
            return false;
        }

        // ---------------------------------------------------------------
        // initialize plugin

        fHandle = fDescriptor->instantiate(fDescriptor, kData->engine->getSampleRate(), fRdfDescriptor->Bundle, fFeatures);

        if (fHandle == nullptr)
        {
            kData->engine->setLastError("Plugin failed to initialize");
            return false;
        }

        // ---------------------------------------------------------------
        // load plugin settings

        {
            // set default options
            fOptions = 0x0;

            fOptions |= PLUGIN_OPTION_FIXED_BUFFER;
            fOptions |= PLUGIN_OPTION_MAP_PROGRAM_CHANGES;

            if (kData->engine->getOptions().forceStereo)
                fOptions |= PLUGIN_OPTION_FORCE_STEREO;

            //if (fDescriptor->midiIns > 0)
            {
                fOptions |= PLUGIN_OPTION_SEND_CHANNEL_PRESSURE;
                fOptions |= PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH;
                fOptions |= PLUGIN_OPTION_SEND_PITCHBEND;
                fOptions |= PLUGIN_OPTION_SEND_ALL_SOUND_OFF;
            }

            // load settings
            kData->idStr  = "LV2/";
            kData->idStr += uri;
            fOptions = kData->loadSettings(fOptions, availableOptions());
        }

        // ---------------------------------------------------------------
        // gui stuff

        if (fRdfDescriptor->UICount == 0)
            return true;

        return true;
    }

private:
    LV2_Handle   fHandle;
    LV2_Handle   fHandle2;
    LV2_Feature* fFeatures[kFeatureCount+1];
    const LV2_Descriptor*     fDescriptor;
    const LV2_RDF_Descriptor* fRdfDescriptor;

    float** fAudioInBuffers;
    float** fAudioOutBuffers;
    float*  fParamBuffers;

    Lv2PluginEventData fEventsIn;
    Lv2PluginEventData fEventsOut;

    struct Extensions {
        const LV2_State_Interface* state;
        const LV2_Worker_Interface* worker;
        const LV2_Programs_Interface* programs;
        const LV2_Programs_UI_Interface* uiprograms;

        Extensions()
            : state(nullptr),
              worker(nullptr),
              programs(nullptr),
              uiprograms(nullptr) {}

        ~Extensions()
        {
            CARLA_ASSERT(state == nullptr);
            CARLA_ASSERT(worker == nullptr);
            CARLA_ASSERT(programs == nullptr);
            CARLA_ASSERT(uiprograms == nullptr);
        }

    } fExt;

    struct UI {
        LV2UI_Handle handle;
        LV2UI_Widget widget;
        const LV2UI_Descriptor* descriptor;
        const LV2_RDF_UI*       rdfDescriptor;

        UI()
            : handle(nullptr),
              widget(nullptr),
              descriptor(nullptr),
              rdfDescriptor(nullptr) {}

        ~UI()
        {
            CARLA_ASSERT(handle == nullptr);
            CARLA_ASSERT(widget == nullptr);
            CARLA_ASSERT(descriptor == nullptr);
            CARLA_ASSERT(rdfDescriptor == nullptr);
        }

    } fUi;

    // -------------------------------------------------------------------
    // Event Feature

    static uint32_t carla_lv2_event_ref(LV2_Event_Callback_Data callback_data, LV2_Event* event)
    {
        carla_debug("carla_lv2_event_ref(%p, %p)", callback_data, event);
        CARLA_ASSERT(callback_data != nullptr);
        CARLA_ASSERT(event != nullptr);

        return 0;
    }

    static uint32_t carla_lv2_event_unref(LV2_Event_Callback_Data callback_data, LV2_Event* event)
    {
        carla_debug("carla_lv2_event_unref(%p, %p)", callback_data, event);
        CARLA_ASSERT(callback_data != nullptr);
        CARLA_ASSERT(event != nullptr);

        return 0;
    }

    // -------------------------------------------------------------------
    // Logs Feature

    static int carla_lv2_log_printf(LV2_Log_Handle handle, LV2_URID type, const char* fmt, ...)
    {
        CARLA_ASSERT(handle != nullptr);
        CARLA_ASSERT(type > CARLA_URI_MAP_ID_NULL);

#ifndef DEBUG
        if (type == CARLA_URI_MAP_ID_LOG_TRACE)
            return 0;
#endif

        va_list args;
        va_start(args, fmt);
        const int ret = carla_lv2_log_vprintf(handle, type, fmt, args);
        va_end(args);

        return ret;
    }

    static int carla_lv2_log_vprintf(LV2_Log_Handle handle, LV2_URID type, const char* fmt, va_list ap)
    {
        CARLA_ASSERT(handle != nullptr);
        CARLA_ASSERT(type > CARLA_URI_MAP_ID_NULL);

#ifndef DEBUG
        if (type == CARLA_URI_MAP_ID_LOG_TRACE)
            return 0;
#endif

        int ret = 0;

        switch (type)
        {
        case CARLA_URI_MAP_ID_LOG_ERROR:
#ifndef CARLA_OS_WIN
            std::fprintf(stderr, "\x1b[31m");
#endif
            ret = std::vfprintf(stderr, fmt, ap);
#ifndef CARLA_OS_WIN
            std::fprintf(stderr, "\x1b[0m");
#endif
            break;

        case CARLA_URI_MAP_ID_LOG_NOTE:
            ret = std::vfprintf(stdout, fmt, ap);
            break;

        case CARLA_URI_MAP_ID_LOG_TRACE:
#ifdef DEBUG
# ifndef CARLA_OS_WIN
            std::fprintf(stdout, "\x1b[30;1m");
# endif
            ret = std::vfprintf(stdout, fmt, ap);
# ifndef CARLA_OS_WIN
            std::fprintf(stdout, "\x1b[0m");
# endif
#endif
            break;

        case CARLA_URI_MAP_ID_LOG_WARNING:
            ret = std::vfprintf(stderr, fmt, ap);
            break;

        default:
            break;
        }

        return ret;
    }

    // -------------------------------------------------------------------
    // Programs Feature

    static void carla_lv2_program_changed(LV2_Programs_Handle handle, int32_t index)
    {
        carla_debug("carla_lv2_program_changed(%p, %i)", handle, index);
        CARLA_ASSERT(handle != nullptr);

        if (handle == nullptr)
            return;

        //((Lv2Plugin*)handle)->handleProgramChanged(index);
    }

    // -------------------------------------------------------------------
    // State Feature

    static char* carla_lv2_state_make_path(LV2_State_Make_Path_Handle handle, const char* path)
    {
        carla_debug("carla_lv2_state_make_path(%p, \"%s\")", handle, path);
        CARLA_ASSERT(handle != nullptr);
        CARLA_ASSERT(path != nullptr);

        if (path == nullptr)
            return nullptr;

        QDir dir;
        dir.mkpath(path);
        return strdup(path);
    }

    static char* carla_lv2_state_map_abstract_path(LV2_State_Map_Path_Handle handle, const char* absolute_path)
    {
        carla_debug("carla_lv2_state_map_abstract_path(%p, \"%s\")", handle, absolute_path);
        CARLA_ASSERT(handle != nullptr);
        CARLA_ASSERT(absolute_path != nullptr);

        if (absolute_path == nullptr)
            return nullptr;

        QDir dir(absolute_path);
        return strdup(dir.canonicalPath().toUtf8().constData());
    }

    static char* carla_lv2_state_map_absolute_path(LV2_State_Map_Path_Handle handle, const char* abstract_path)
    {
        carla_debug("carla_lv2_state_map_absolute_path(%p, \"%s\")", handle, abstract_path);
        CARLA_ASSERT(handle != nullptr);
        CARLA_ASSERT(abstract_path != nullptr);

        if (abstract_path == nullptr)
            return nullptr;

        QDir dir(abstract_path);
        return strdup(dir.absolutePath().toUtf8().constData());
    }

    static LV2_State_Status carla_lv2_state_store(LV2_State_Handle handle, uint32_t key, const void* value, size_t size, uint32_t type, uint32_t flags)
    {
        carla_debug("carla_lv2_state_store(%p, %i, %p, " P_SIZE ", %i, %i)", handle, key, value, size, type, flags);
        CARLA_ASSERT(handle != nullptr);

        if (handle == nullptr)
            return LV2_STATE_ERR_UNKNOWN;

        //return ((Lv2Plugin*)handle)->handleStateStore(key, value, size, type, flags);
        return LV2_STATE_ERR_UNKNOWN;
    }

    static const void* carla_lv2_state_retrieve(LV2_State_Handle handle, uint32_t key, size_t* size, uint32_t* type, uint32_t* flags)
    {
        carla_debug("carla_lv2_state_retrieve(%p, %i, %p, %p, %p)", handle, key, size, type, flags);
        CARLA_ASSERT(handle != nullptr);

        if (handle == nullptr)
            return nullptr;

        //return ((Lv2Plugin*)handle)->handleStateRetrieve(key, size, type, flags);
        return nullptr;
    }

    // -------------------------------------------------------------------
    // URI-Map Feature

    static uint32_t carla_lv2_uri_to_id(LV2_URI_Map_Callback_Data data, const char* map, const char* uri)
    {
        carla_debug("carla_lv2_uri_to_id(%p, \"%s\", \"%s\")", data, map, uri);
        return carla_lv2_urid_map((LV2_URID_Map_Handle*)data, uri);
    }

    // -------------------------------------------------------------------
    // URID Feature

    static LV2_URID carla_lv2_urid_map(LV2_URID_Map_Handle handle, const char* uri)
    {
        CARLA_ASSERT(handle != nullptr);
        CARLA_ASSERT(uri != nullptr);
        carla_debug("carla_lv2_urid_map(%p, \"%s\")", handle, uri);

        if (uri == nullptr)
            return CARLA_URI_MAP_ID_NULL;

        // Atom types
        if (std::strcmp(uri, LV2_ATOM__Chunk) == 0)
            return CARLA_URI_MAP_ID_ATOM_CHUNK;
        if (std::strcmp(uri, LV2_ATOM__Double) == 0)
            return CARLA_URI_MAP_ID_ATOM_DOUBLE;
        if (std::strcmp(uri, LV2_ATOM__Int) == 0)
            return CARLA_URI_MAP_ID_ATOM_INT;
        if (std::strcmp(uri, LV2_ATOM__Path) == 0)
            return CARLA_URI_MAP_ID_ATOM_PATH;
        if (std::strcmp(uri, LV2_ATOM__Sequence) == 0)
            return CARLA_URI_MAP_ID_ATOM_SEQUENCE;
        if (std::strcmp(uri, LV2_ATOM__String) == 0)
            return CARLA_URI_MAP_ID_ATOM_STRING;
        if (std::strcmp(uri, LV2_ATOM__atomTransfer) == 0)
            return CARLA_URI_MAP_ID_ATOM_TRANSFER_ATOM;
        if (std::strcmp(uri, LV2_ATOM__eventTransfer) == 0)
            return CARLA_URI_MAP_ID_ATOM_TRANSFER_EVENT;

        // BufSize types
        if (std::strcmp(uri, LV2_BUF_SIZE__maxBlockLength) == 0)
            return CARLA_URI_MAP_ID_BUF_MAX_LENGTH;
        if (std::strcmp(uri, LV2_BUF_SIZE__minBlockLength) == 0)
            return CARLA_URI_MAP_ID_BUF_MIN_LENGTH;
        if (std::strcmp(uri, LV2_BUF_SIZE__sequenceSize) == 0)
            return CARLA_URI_MAP_ID_BUF_SEQUENCE_SIZE;

        // Log types
        if (std::strcmp(uri, LV2_LOG__Error) == 0)
            return CARLA_URI_MAP_ID_LOG_ERROR;
        if (std::strcmp(uri, LV2_LOG__Note) == 0)
            return CARLA_URI_MAP_ID_LOG_NOTE;
        if (std::strcmp(uri, LV2_LOG__Trace) == 0)
            return CARLA_URI_MAP_ID_LOG_TRACE;
        if (std::strcmp(uri, LV2_LOG__Warning) == 0)
            return CARLA_URI_MAP_ID_LOG_WARNING;

        // Others
        if (std::strcmp(uri, LV2_MIDI__MidiEvent) == 0)
            return CARLA_URI_MAP_ID_MIDI_EVENT;
        if (std::strcmp(uri, LV2_PARAMETERS__sampleRate) == 0)
            return CARLA_URI_MAP_ID_PARAM_SAMPLE_RATE;
        if (std::strcmp(uri, LV2_TIME__Position) == 0)
            return CARLA_URI_MAP_ID_TIME_POSITION;

        if (handle == nullptr)
            return CARLA_URI_MAP_ID_NULL;

        // Custom types
        //return ((Lv2Plugin*)handle)->getCustomURID(uri);
        return 0;
    }

    static const char* carla_lv2_urid_unmap(LV2_URID_Map_Handle handle, LV2_URID urid)
    {
        carla_debug("carla_lv2_urid_unmap(%p, %i)", handle, urid);
        CARLA_ASSERT(handle != nullptr);
        CARLA_ASSERT(urid > CARLA_URI_MAP_ID_NULL);

        if (urid == CARLA_URI_MAP_ID_NULL)
            return nullptr;

        // Atom types
        if (urid == CARLA_URI_MAP_ID_ATOM_CHUNK)
            return LV2_ATOM__Chunk;
        if (urid == CARLA_URI_MAP_ID_ATOM_DOUBLE)
            return LV2_ATOM__Double;
        if (urid == CARLA_URI_MAP_ID_ATOM_INT)
            return LV2_ATOM__Int;
        if (urid == CARLA_URI_MAP_ID_ATOM_PATH)
            return LV2_ATOM__Path;
        if (urid == CARLA_URI_MAP_ID_ATOM_SEQUENCE)
            return LV2_ATOM__Sequence;
        if (urid == CARLA_URI_MAP_ID_ATOM_STRING)
            return LV2_ATOM__String;
        if (urid == CARLA_URI_MAP_ID_ATOM_TRANSFER_ATOM)
            return LV2_ATOM__atomTransfer;
        if (urid == CARLA_URI_MAP_ID_ATOM_TRANSFER_EVENT)
            return LV2_ATOM__eventTransfer;

        // BufSize types
        if (urid == CARLA_URI_MAP_ID_BUF_MAX_LENGTH)
            return LV2_BUF_SIZE__maxBlockLength;
        if (urid == CARLA_URI_MAP_ID_BUF_MIN_LENGTH)
            return LV2_BUF_SIZE__minBlockLength;
        if (urid == CARLA_URI_MAP_ID_BUF_SEQUENCE_SIZE)
            return LV2_BUF_SIZE__sequenceSize;

        // Log types
        if (urid == CARLA_URI_MAP_ID_LOG_ERROR)
            return LV2_LOG__Error;
        if (urid == CARLA_URI_MAP_ID_LOG_NOTE)
            return LV2_LOG__Note;
        if (urid == CARLA_URI_MAP_ID_LOG_TRACE)
            return LV2_LOG__Trace;
        if (urid == CARLA_URI_MAP_ID_LOG_WARNING)
            return LV2_LOG__Warning;

        // Others
        if (urid == CARLA_URI_MAP_ID_MIDI_EVENT)
            return LV2_MIDI__MidiEvent;
        if (urid == CARLA_URI_MAP_ID_PARAM_SAMPLE_RATE)
            return LV2_PARAMETERS__sampleRate;
        if (urid == CARLA_URI_MAP_ID_TIME_POSITION)
            return LV2_TIME__Position;

        if (handle == nullptr)
            return nullptr;

        // Custom types
        //return ((Lv2Plugin*)handle)->getCustomURIString(urid);
        return nullptr;
    }

    // -------------------------------------------------------------------
    // Worker Feature

    static LV2_Worker_Status carla_lv2_worker_schedule(LV2_Worker_Schedule_Handle handle, uint32_t size, const void* data)
    {
        carla_debug("carla_lv2_worker_schedule(%p, %i, %p)", handle, size, data);
        CARLA_ASSERT(handle != nullptr);

        if (handle == nullptr)
            return LV2_WORKER_ERR_UNKNOWN;

        //return ((Lv2Plugin*)handle)->handleWorkerSchedule(size, data);
        return LV2_WORKER_ERR_UNKNOWN;
    }

    static LV2_Worker_Status carla_lv2_worker_respond(LV2_Worker_Respond_Handle handle, uint32_t size, const void* data)
    {
        carla_debug("carla_lv2_worker_respond(%p, %i, %p)", handle, size, data);
        CARLA_ASSERT(handle != nullptr);

        if (handle == nullptr)
            return LV2_WORKER_ERR_UNKNOWN;

        //return ((Lv2Plugin*)handle)->handleWorkerRespond(size, data);
        return LV2_WORKER_ERR_UNKNOWN;
    }

    // -------------------------------------------------------------------
    // UI Port-Map Feature

    static uint32_t carla_lv2_ui_port_map(LV2UI_Feature_Handle handle, const char* symbol)
    {
        carla_debug("carla_lv2_ui_port_map(%p, \"%s\")", handle, symbol);
        CARLA_ASSERT(handle);

        if (handle == nullptr)
            return LV2UI_INVALID_PORT_INDEX;

        //return ((Lv2Plugin*)handle)->handleUiPortMap(symbol);
        return LV2UI_INVALID_PORT_INDEX;
    }

    // -------------------------------------------------------------------
    // UI Resize Feature

    static int carla_lv2_ui_resize(LV2UI_Feature_Handle handle, int width, int height)
    {
        carla_debug("carla_lv2_ui_resize(%p, %i, %i)", handle, width, height);
        CARLA_ASSERT(handle != nullptr);

        if (handle == nullptr)
            return 1;

        //return ((Lv2Plugin*)handle)->handleUiResize(width, height);
        return 1;
    }

    // -------------------------------------------------------------------
    // External UI Feature

    static void carla_lv2_external_ui_closed(LV2UI_Controller controller)
    {
        carla_debug("carla_lv2_external_ui_closed(%p)", controller);
        CARLA_ASSERT(controller != nullptr);

        if (controller == nullptr)
            return;

        //((Lv2Plugin*)handle)->handleExternalUiClosed();
    }

    // -------------------------------------------------------------------
    // UI Extension

    static void carla_lv2_ui_write_function(LV2UI_Controller controller, uint32_t port_index, uint32_t buffer_size, uint32_t format, const void* buffer)
    {
        carla_debug("carla_lv2_ui_write_function(%p, %i, %i, %i, %p)", controller, port_index, buffer_size, format, buffer);
        CARLA_ASSERT(controller != nullptr);

        if (controller == nullptr)
            return;

        //((Lv2Plugin*)handle)->handleUiWrite(port_index, buffer_size, format, buffer);
    }

    // -------------------------------------------------------------------

    CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(Lv2Plugin)
};

CARLA_BACKEND_END_NAMESPACE

#else // WANT_VST
# warning Building without LV2 support
#endif

CARLA_BACKEND_START_NAMESPACE

CarlaPlugin* CarlaPlugin::newLV2(const Initializer& init)
{
    carla_debug("CarlaPlugin::newLV2({%p, \"%s\", \"%s\", \"%s\"})", init.engine, init.filename, init.name, init.label);

#ifdef WANT_LV2
    Lv2Plugin* const plugin(new Lv2Plugin(init.engine, init.id));

    if (! plugin->init(init.filename, init.name, init.label))
    {
        delete plugin;
        return nullptr;
    }

    plugin->reload();

    if (init.engine->getProccessMode() == PROCESS_MODE_CONTINUOUS_RACK && ! CarlaPluginProtectedData::canRunInRack(plugin))
    {
        init.engine->setLastError("Carla's rack mode can only work with Mono or Stereo LV2 plugins, sorry!");
        delete plugin;
        return nullptr;
    }

    return plugin;
#else
    init.engine->setLastError("LV2 support not available");
    return nullptr;
#endif
}

CARLA_BACKEND_END_NAMESPACE