Carla/source/backend/plugin/Lv2Plugin.cpp

/*
 * Carla LV2 Plugin
 * Copyright (C) 2011-2014 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 doc/GPL.txt file.
 */

#include "CarlaPluginInternal.hpp"
#include "CarlaEngine.hpp"

#ifdef WANT_LV2

#include "CarlaLv2Utils.hpp"
#include "CarlaMathUtils.hpp"
#include "Lv2AtomQueue.hpp"

#include "../engine/CarlaEngineOsc.hpp"

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

#include <QtCore/QDir>
#include <QtCore/QUrl>

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

CARLA_BACKEND_START_NAMESPACE

#if 0
}
#endif

// Maximum default buffer size
const unsigned int MAX_DEFAULT_BUFFER_SIZE = 8192; // 0x2000

// Extra Plugin Hints
const unsigned int PLUGIN_HAS_EXTENSION_OPTIONS  = 0x1000;
const unsigned int PLUGIN_HAS_EXTENSION_PROGRAMS = 0x2000;
const unsigned int PLUGIN_HAS_EXTENSION_STATE    = 0x4000;
const unsigned int PLUGIN_HAS_EXTENSION_WORKER   = 0x8000;

// Extra Parameter Hints
const unsigned int PARAMETER_IS_STRICT_BOUNDS = 0x1000;
const unsigned int PARAMETER_IS_TRIGGER       = 0x2000;

// LV2 Event Data/Types
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; // unused
const unsigned int CARLA_EVENT_TYPE_MIDI    = 0x20;
const unsigned int CARLA_EVENT_TYPE_TIME    = 0x40;

// LV2 URI Map Ids
const uint32_t CARLA_URI_MAP_ID_NULL                   =  0;
const uint32_t CARLA_URI_MAP_ID_ATOM_BLANK             =  1;
const uint32_t CARLA_URI_MAP_ID_ATOM_BOOL              =  2;
const uint32_t CARLA_URI_MAP_ID_ATOM_CHUNK             =  3;
const uint32_t CARLA_URI_MAP_ID_ATOM_DOUBLE            =  4;
const uint32_t CARLA_URI_MAP_ID_ATOM_FLOAT             =  5;
const uint32_t CARLA_URI_MAP_ID_ATOM_INT               =  6;
const uint32_t CARLA_URI_MAP_ID_ATOM_LITERAL           =  7;
const uint32_t CARLA_URI_MAP_ID_ATOM_LONG              =  8;
const uint32_t CARLA_URI_MAP_ID_ATOM_PATH              =  9;
const uint32_t CARLA_URI_MAP_ID_ATOM_PROPERTY          = 10;
const uint32_t CARLA_URI_MAP_ID_ATOM_RESOURCE          = 11;
const uint32_t CARLA_URI_MAP_ID_ATOM_SEQUENCE          = 12;
const uint32_t CARLA_URI_MAP_ID_ATOM_STRING            = 13;
const uint32_t CARLA_URI_MAP_ID_ATOM_TUPLE             = 14;
const uint32_t CARLA_URI_MAP_ID_ATOM_URI               = 15;
const uint32_t CARLA_URI_MAP_ID_ATOM_URID              = 16;
const uint32_t CARLA_URI_MAP_ID_ATOM_VECTOR            = 17;
const uint32_t CARLA_URI_MAP_ID_ATOM_TRANSFER_ATOM     = 18;
const uint32_t CARLA_URI_MAP_ID_ATOM_TRANSFER_EVENT    = 19;
const uint32_t CARLA_URI_MAP_ID_BUF_MAX_LENGTH         = 20;
const uint32_t CARLA_URI_MAP_ID_BUF_MIN_LENGTH         = 21;
const uint32_t CARLA_URI_MAP_ID_BUF_SEQUENCE_SIZE      = 22;
const uint32_t CARLA_URI_MAP_ID_LOG_ERROR              = 23;
const uint32_t CARLA_URI_MAP_ID_LOG_NOTE               = 24;
const uint32_t CARLA_URI_MAP_ID_LOG_TRACE              = 25;
const uint32_t CARLA_URI_MAP_ID_LOG_WARNING            = 26;
const uint32_t CARLA_URI_MAP_ID_TIME_POSITION          = 27; // base type
const uint32_t CARLA_URI_MAP_ID_TIME_BAR               = 28; // values
const uint32_t CARLA_URI_MAP_ID_TIME_BAR_BEAT          = 29;
const uint32_t CARLA_URI_MAP_ID_TIME_BEAT              = 30;
const uint32_t CARLA_URI_MAP_ID_TIME_BEAT_UNIT         = 31;
const uint32_t CARLA_URI_MAP_ID_TIME_BEATS_PER_BAR     = 32;
const uint32_t CARLA_URI_MAP_ID_TIME_BEATS_PER_MINUTE  = 33;
const uint32_t CARLA_URI_MAP_ID_TIME_FRAME             = 34;
const uint32_t CARLA_URI_MAP_ID_TIME_FRAMES_PER_SECOND = 35;
const uint32_t CARLA_URI_MAP_ID_TIME_SPEED             = 36;
const uint32_t CARLA_URI_MAP_ID_MIDI_EVENT             = 37;
const uint32_t CARLA_URI_MAP_ID_PARAM_SAMPLE_RATE      = 38;
const uint32_t CARLA_URI_MAP_ID_COUNT                  = 39;

// 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 kFeatureIdHardRtCapable    =  4;
const uint32_t kFeatureIdInPlaceBroken    =  5;
const uint32_t kFeatureIdIsLive           =  6;
const uint32_t kFeatureIdLogs             =  7;
const uint32_t kFeatureIdOptions          =  8;
const uint32_t kFeatureIdPrograms         =  9;
const uint32_t kFeatureIdRtMemPool        = 10;
const uint32_t kFeatureIdStateMakePath    = 11;
const uint32_t kFeatureIdStateMapPath     = 12;
const uint32_t kFeatureIdStrictBounds     = 13;
const uint32_t kFeatureIdUriMap           = 14;
const uint32_t kFeatureIdUridMap          = 15;
const uint32_t kFeatureIdUridUnmap        = 16;
const uint32_t kFeatureIdWorker           = 17;
const uint32_t kFeatureCountPlugin        = 18;
const uint32_t kFeatureIdUiDataAccess     = 18;
const uint32_t kFeatureIdUiInstanceAccess = 19;
const uint32_t kFeatureIdUiIdle           = 20;
const uint32_t kFeatureIdUiFixedSize      = 21;
const uint32_t kFeatureIdUiMakeResident   = 22;
const uint32_t kFeatureIdUiNoUserResize   = 23;
const uint32_t kFeatureIdUiParent         = 24;
const uint32_t kFeatureIdUiPortMap        = 25;
const uint32_t kFeatureIdUiPortSubscribe  = 26;
const uint32_t kFeatureIdUiResize         = 27;
const uint32_t kFeatureIdUiTouch          = 28;
const uint32_t kFeatureIdExternalUi       = 29;
const uint32_t kFeatureIdExternalUiOld    = 30;
const uint32_t kFeatureCountAll           = 31;

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

struct Lv2PluginOptions {
    enum OptIndex {
        MaxBlockLenth = 0,
        MinBlockLenth,
        SequenceSize,
        SampleRate,
        Null
    };

    int maxBufferSize;
    int minBufferSize;
    int sequenceSize;
    double sampleRate;
    LV2_Options_Option opts[5];

    Lv2PluginOptions()
        : maxBufferSize(0),
          minBufferSize(0),
          sequenceSize(MAX_DEFAULT_BUFFER_SIZE),
          sampleRate(0.0)
    {
        LV2_Options_Option& optMaxBlockLenth(opts[MaxBlockLenth]);
        optMaxBlockLenth.context = LV2_OPTIONS_INSTANCE;
        optMaxBlockLenth.subject = 0;
        optMaxBlockLenth.key     = CARLA_URI_MAP_ID_BUF_MAX_LENGTH;
        optMaxBlockLenth.size    = sizeof(int);
        optMaxBlockLenth.type    = CARLA_URI_MAP_ID_ATOM_INT;
        optMaxBlockLenth.value   = &maxBufferSize;

        LV2_Options_Option& optMinBlockLenth(opts[MinBlockLenth]);
        optMinBlockLenth.context = LV2_OPTIONS_INSTANCE;
        optMinBlockLenth.subject = 0;
        optMinBlockLenth.key     = CARLA_URI_MAP_ID_BUF_MIN_LENGTH;
        optMinBlockLenth.size    = sizeof(int);
        optMinBlockLenth.type    = CARLA_URI_MAP_ID_ATOM_INT;
        optMinBlockLenth.value   = &minBufferSize;

        LV2_Options_Option& optSequenceSize(opts[SequenceSize]);
        optSequenceSize.context = LV2_OPTIONS_INSTANCE;
        optSequenceSize.subject = 0;
        optSequenceSize.key     = CARLA_URI_MAP_ID_BUF_SEQUENCE_SIZE;
        optSequenceSize.size    = sizeof(int);
        optSequenceSize.type    = CARLA_URI_MAP_ID_ATOM_INT;
        optSequenceSize.value   = &sequenceSize;

        LV2_Options_Option& optSampleRate(opts[SampleRate]);
        optSampleRate.context = LV2_OPTIONS_INSTANCE;
        optSampleRate.subject = 0;
        optSampleRate.key     = CARLA_URI_MAP_ID_PARAM_SAMPLE_RATE;
        optSampleRate.size    = sizeof(double);
        optSampleRate.type    = CARLA_URI_MAP_ID_ATOM_DOUBLE;
        optSampleRate.value   = &sampleRate;

        LV2_Options_Option& optNull(opts[Null]);
        optNull.context = LV2_OPTIONS_INSTANCE;
        optNull.subject = 0;
        optNull.key     = CARLA_URI_MAP_ID_NULL;
        optNull.size    = 0;
        optNull.type    = CARLA_URI_MAP_ID_NULL;
        optNull.value   = nullptr;
    }
};

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

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

        carla_fill<LV2_Feature*>(fFeatures, kFeatureCountAll+1, nullptr);

        for (uint32_t i=0; i < CARLA_URI_MAP_ID_COUNT; ++i)
            fCustomURIDs.append(nullptr);

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

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

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

        if (pData->client != nullptr && pData->client->isActive())
            pData->client->deactivate();

        if (pData->active)
        {
            deactivate();
            pData->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[kFeatureIdEvent] != nullptr && fFeatures[kFeatureIdEvent]->data != nullptr)
            delete (LV2_Event_Feature*)fFeatures[kFeatureIdEvent]->data;

        if (fFeatures[kFeatureIdLogs] != nullptr && fFeatures[kFeatureIdLogs]->data != nullptr)
            delete (LV2_Log_Log*)fFeatures[kFeatureIdLogs]->data;

        if (fFeatures[kFeatureIdStateMakePath] != nullptr && fFeatures[kFeatureIdStateMakePath]->data != nullptr)
            delete (LV2_State_Make_Path*)fFeatures[kFeatureIdStateMakePath]->data;

        if (fFeatures[kFeatureIdStateMapPath] != nullptr && fFeatures[kFeatureIdStateMapPath]->data != nullptr)
            delete (LV2_State_Map_Path*)fFeatures[kFeatureIdStateMapPath]->data;

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

        if (fFeatures[kFeatureIdRtMemPool] != nullptr && fFeatures[kFeatureIdRtMemPool]->data != nullptr)
            delete (LV2_RtMemPool_Pool*)fFeatures[kFeatureIdRtMemPool]->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 < kFeatureCountAll; ++i)
        {
            if (fFeatures[i] != nullptr)
            {
                delete fFeatures[i];
                fFeatures[i] = nullptr;
            }
        }

        for (LinkedList<const char*>::Itenerator it = fCustomURIDs.begin(); it.valid(); it.next())
        {
            const char*& uri(it.getValue());

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

        fCustomURIDs.clear();

        clearBuffers();
    }

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

    PluginType getType() const noexcept override
    {
        return PLUGIN_LV2;
    }

    PluginCategory getCategory() const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, CarlaPlugin::getCategory());

        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 CarlaPlugin::getCategory();
    }

    long getUniqueId() const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, 0);

        return static_cast<long>(fRdfDescriptor->UniqueID);
    }

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

    uint32_t getMidiInCount() const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, 0);

        uint32_t count = 0;

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

            if (LV2_IS_PORT_INPUT(portTypes) && LV2_PORT_SUPPORTS_MIDI_EVENT(portTypes))
                count += 1;
        }

        return count;
    }

    uint32_t getMidiOutCount() const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, 0);

        uint32_t count = 0;

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

            if (LV2_IS_PORT_OUTPUT(portTypes) && LV2_PORT_SUPPORTS_MIDI_EVENT(portTypes))
                count += 1;
        }

        return count;
    }

    uint32_t getParameterScalePointCount(const uint32_t parameterId) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, 0);
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count, 0);

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

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

        return 0;
    }

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

    // nothing

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

    unsigned int getOptionsAvailable() const noexcept override
    {
        const bool hasMidiIn(getMidiInCount() > 0);

        unsigned int options = 0x0;

        options |= PLUGIN_OPTION_MAP_PROGRAM_CHANGES;

        if (! (hasMidiIn || needsFixedBuffer()))
            options |= PLUGIN_OPTION_FIXED_BUFFERS;

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

        if (hasMidiIn)
        {
            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) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fParamBuffers != nullptr, 0.0f);
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count, 0.0f);

        if (pData->param.data[parameterId].hints & PARAMETER_IS_STRICT_BOUNDS)
            pData->param.ranges[parameterId].fixValue(fParamBuffers[parameterId]);

        return fParamBuffers[parameterId];
    }

    float getParameterScalePointValue(const uint32_t parameterId, const uint32_t scalePointId) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, 0.0f);
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count, 0.0f);
        CARLA_SAFE_ASSERT_RETURN(scalePointId < getParameterScalePointCount(parameterId), 0.0f);

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

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

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

        return 0.0f;
    }

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

        std::strncpy(strBuf, fRdfDescriptor->URI, STR_MAX);
    }

    void getMaker(char* const strBuf) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr,);

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

    void getCopyright(char* const strBuf) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr,);

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

    void getRealName(char* const strBuf) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(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) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count,);

        const int32_t rindex(pData->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) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count,);

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

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

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

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

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

            if (LV2_HAVE_PORT_UNIT_SYMBOL(port->Unit.Hints) && port->Unit.Symbol != nullptr)
            {
                std::strncpy(strBuf, port->Unit.Symbol, STR_MAX);
                return;
            }

            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) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count,);
        CARLA_SAFE_ASSERT_RETURN(scalePointId < getParameterScalePointCount(parameterId),);

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

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

            if (scalePointId < port->ScalePointCount)
            {
                const LV2_RDF_PortScalePoint* const 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_SAFE_ASSERT_RETURN(fHandle != nullptr,);

        if (fExt.state != nullptr && fExt.state->save != nullptr)
        {
            fExt.state->save(fHandle, carla_lv2_state_store, this, LV2_STATE_IS_POD, fFeatures);

            if (fHandle2 != nullptr)
                fExt.state->save(fHandle2, carla_lv2_state_store, this, LV2_STATE_IS_POD, fFeatures);
        }
    }

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

    void setName(const char* const newName) override
    {
        CarlaPlugin::setName(newName);

        QString guiTitle(QString("%1 (GUI)").arg(pData->name));

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

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

            uiHost->plugin_human_id = carla_strdup(guiTitle.toUtf8().constData());
        }
    }

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

    void setParameterValue(const uint32_t parameterId, const float value, const bool sendGui, const bool sendOsc, const bool sendCallback) noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fParamBuffers != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count,);

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

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

    // -------------------------------------------------------------------
    // Set ui stuff

    // nothing

    // -------------------------------------------------------------------
    // Plugin state

    void reload() override
    {
        CARLA_SAFE_ASSERT_RETURN(pData->engine != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(fHandle != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(fDescriptor != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr,);
        carla_debug("Lv2Plugin::reload() - start");

        const EngineProcessMode processMode(pData->engine->getProccessMode());

        // Safely disable plugin for reload
        const ScopedDisabler sd(this);

        if (pData->active)
            deactivate();

        clearBuffers();

        const float sampleRate(static_cast<float>(pData->engine->getSampleRate()));
        const uint32_t portCount(fRdfDescriptor->PortCount);

        uint32_t aIns, aOuts, cvIns, cvOuts, params;
        aIns = aOuts = cvIns = cvOuts = params = 0;
        LinkedList<unsigned int> evIns, evOuts;

        bool forcedStereoIn, forcedStereoOut;
        forcedStereoIn = forcedStereoOut = false;

        bool needsCtrlIn, needsCtrlOut;
        needsCtrlIn = needsCtrlOut = false;

        for (uint32_t i=0; i < portCount; ++i)
        {
            const LV2_Property portTypes(fRdfDescriptor->Ports[i].Types);

            if (LV2_IS_PORT_AUDIO(portTypes))
            {
                if (LV2_IS_PORT_INPUT(portTypes))
                    aIns += 1;
                else if (LV2_IS_PORT_OUTPUT(portTypes))
                    aOuts += 1;
            }
            else if (LV2_IS_PORT_CV(portTypes))
            {
                if (LV2_IS_PORT_INPUT(portTypes))
                    cvIns += 1;
                else if (LV2_IS_PORT_OUTPUT(portTypes))
                    cvOuts += 1;
            }
            else if (LV2_IS_PORT_ATOM_SEQUENCE(portTypes))
            {
                if (LV2_IS_PORT_INPUT(portTypes))
                    evIns.append(CARLA_EVENT_DATA_ATOM);
                else if (LV2_IS_PORT_OUTPUT(portTypes))
                    evOuts.append(CARLA_EVENT_DATA_ATOM);
            }
            else if (LV2_IS_PORT_EVENT(portTypes))
            {
                if (LV2_IS_PORT_INPUT(portTypes))
                    evIns.append(CARLA_EVENT_DATA_EVENT);
                else if (LV2_IS_PORT_OUTPUT(portTypes))
                    evOuts.append(CARLA_EVENT_DATA_EVENT);
            }
            else if (LV2_IS_PORT_MIDI_LL(portTypes))
            {
                if (LV2_IS_PORT_INPUT(portTypes))
                    evIns.append(CARLA_EVENT_DATA_MIDI_LL);
                else if (LV2_IS_PORT_OUTPUT(portTypes))
                    evOuts.append(CARLA_EVENT_DATA_MIDI_LL);
            }
            else if (LV2_IS_PORT_CONTROL(portTypes))
                params += 1;
        }

        recheckExtensions();

        if ((pData->options & PLUGIN_OPTION_FORCE_STEREO) != 0 && (aIns == 1 || aOuts == 1) && fExt.state == nullptr && fExt.worker == nullptr)
        {
            if (fHandle2 == nullptr)
                fHandle2 = fDescriptor->instantiate(fDescriptor, sampleRate, fRdfDescriptor->Bundle, fFeatures);

            if (fHandle2 != nullptr)
            {
                if (aIns == 1)
                {
                    aIns = 2;
                    forcedStereoIn = true;
                }

                if (aOuts == 1)
                {
                    aOuts = 2;
                    forcedStereoOut = true;
                }
            }
        }

        if (aIns > 0)
        {
            pData->audioIn.createNew(aIns);
            fAudioInBuffers = new float*[aIns];

            for (uint32_t i=0; i < aIns; ++i)
                fAudioInBuffers[i] = nullptr;
        }

        if (aOuts > 0)
        {
            pData->audioOut.createNew(aOuts);
            fAudioOutBuffers = new float*[aOuts];
            needsCtrlIn = true;

            for (uint32_t i=0; i < aOuts; ++i)
                fAudioOutBuffers[i] = nullptr;
        }

        if (params > 0)
        {
            pData->param.createNew(params, true);
            fParamBuffers = new float[params];
            FLOAT_CLEAR(fParamBuffers, params);
        }

        const uint portNameSize(pData->engine->getMaxPortNameSize());
        CarlaString portName;

        for (uint32_t i=0, iAudioIn=0, iAudioOut=0, iCtrl=0; i < portCount; ++i)
        {
            const LV2_Property portTypes(fRdfDescriptor->Ports[i].Types);

            portName.clear();

            if (LV2_IS_PORT_AUDIO(portTypes) || LV2_IS_PORT_ATOM_SEQUENCE(portTypes) || LV2_IS_PORT_CV(portTypes) || LV2_IS_PORT_EVENT(portTypes) || LV2_IS_PORT_MIDI_LL(portTypes))
            {
                if (processMode == ENGINE_PROCESS_MODE_SINGLE_CLIENT)
                {
                    portName  = pData->name;
                    portName += ":";
                }

                portName += fRdfDescriptor->Ports[i].Name;
                portName.truncate(portNameSize);
            }

            if (LV2_IS_PORT_AUDIO(portTypes))
            {
                if (LV2_IS_PORT_INPUT(portTypes))
                {
                    uint32_t j = iAudioIn++;
                    pData->audioIn.ports[j].port   = (CarlaEngineAudioPort*)pData->client->addPort(kEnginePortTypeAudio, portName, true);
                    pData->audioIn.ports[j].rindex = i;

                    if (forcedStereoIn)
                    {
                        portName += "_2";
                        pData->audioIn.ports[1].port   = (CarlaEngineAudioPort*)pData->client->addPort(kEnginePortTypeAudio, portName, true);
                        pData->audioIn.ports[1].rindex = i;
                    }
                }
                else if (LV2_IS_PORT_OUTPUT(portTypes))
                {
                    uint32_t j = iAudioOut++;
                    pData->audioOut.ports[j].port   = (CarlaEngineAudioPort*)pData->client->addPort(kEnginePortTypeAudio, portName, false);
                    pData->audioOut.ports[j].rindex = i;

                    if (forcedStereoOut)
                    {
                        portName += "_2";
                        pData->audioOut.ports[1].port   = (CarlaEngineAudioPort*)pData->client->addPort(kEnginePortTypeAudio, portName, false);
                        pData->audioOut.ports[1].rindex = i;
                    }
                }
                else
                    carla_stderr2("WARNING - Got a broken Port (Audio, but not input or output)");
            }
            else if (LV2_IS_PORT_CONTROL(portTypes))
            {
                const LV2_Property portProps(fRdfDescriptor->Ports[i].Properties);
                const LV2_Property portDesignation(fRdfDescriptor->Ports[i].Designation);
                const LV2_RDF_PortPoints portPoints(fRdfDescriptor->Ports[i].Points);

                uint32_t j = iCtrl++;
                pData->param.data[j].hints  = 0x0;
                pData->param.data[j].index  = static_cast<int32_t>(j);
                pData->param.data[j].rindex = static_cast<int32_t>(i);
                pData->param.data[j].midiCC = -1;
                pData->param.data[j].midiChannel = 0;
                pData->param.special[j] = PARAMETER_SPECIAL_NULL;

                float min, max, def, step, stepSmall, stepLarge;

                // min value
                if (LV2_HAVE_MINIMUM_PORT_POINT(portPoints.Hints))
                    min = portPoints.Minimum;
                else
                    min = 0.0f;

                // max value
                if (LV2_HAVE_MAXIMUM_PORT_POINT(portPoints.Hints))
                    max = portPoints.Maximum;
                else
                    max = 1.0f;

                if (min > max)
                    max = min;

                // stupid hack for ir.lv2 (broken plugin)
                if (std::strcmp(fRdfDescriptor->URI, "http://factorial.hu/plugins/lv2/ir") == 0 && std::strncmp(fRdfDescriptor->Ports[i].Name, "FileHash", 8) == 0)
                {
                    min = 0.0f;
                    max = (float)0xffffff;
                }

                if (max - min == 0.0f)
                {
                    carla_stderr2("WARNING - Broken plugin parameter '%s': max - min == 0.0f", fRdfDescriptor->Ports[i].Name);
                    max = min + 0.1f;
                }

                // default value
                if (LV2_HAVE_DEFAULT_PORT_POINT(portPoints.Hints))
                {
                    def = portPoints.Default;
                }
                else
                {
                    // no default value
                    if (min < 0.0f && max > 0.0f)
                        def = 0.0f;
                    else
                        def = min;
                }

                if (def < min)
                    def = min;
                else if (def > max)
                    def = max;

                if (LV2_IS_PORT_SAMPLE_RATE(portProps))
                {
                    min *= sampleRate;
                    max *= sampleRate;
                    def *= sampleRate;
                    pData->param.data[j].hints |= PARAMETER_USES_SAMPLERATE;
                }

                if (LV2_IS_PORT_TOGGLED(portProps))
                {
                    step = max - min;
                    stepSmall = step;
                    stepLarge = step;
                    pData->param.data[j].hints |= PARAMETER_IS_BOOLEAN;
                }
                else if (LV2_IS_PORT_INTEGER(portProps))
                {
                    step = 1.0f;
                    stepSmall = 1.0f;
                    stepLarge = 10.0f;
                    pData->param.data[j].hints |= PARAMETER_IS_INTEGER;
                }
                else
                {
                    float range = max - min;
                    step = range/100.0f;
                    stepSmall = range/1000.0f;
                    stepLarge = range/10.0f;
                }

                if (LV2_IS_PORT_INPUT(portTypes))
                {
                    pData->param.data[j].type = PARAMETER_INPUT;

                    if (LV2_IS_PORT_DESIGNATION_LATENCY(portDesignation))
                    {
                        carla_stderr("Plugin has latency input port, this should not happen!");
                    }
                    else if (LV2_IS_PORT_DESIGNATION_SAMPLE_RATE(portDesignation))
                    {
                        def = sampleRate;
                        step = 1.0f;
                        stepSmall = 1.0f;
                        stepLarge = 1.0f;
                        pData->param.special[j] = PARAMETER_SPECIAL_SAMPLE_RATE;
                    }
                    else if (LV2_IS_PORT_DESIGNATION_FREEWHEELING(portDesignation))
                    {
                        pData->param.special[j] = PARAMETER_SPECIAL_LV2_FREEWHEEL;
                    }
                    else if (LV2_IS_PORT_DESIGNATION_TIME(portDesignation))
                    {
                        pData->param.special[j] = PARAMETER_SPECIAL_LV2_TIME;
                    }
                    else
                    {
                        pData->param.data[j].hints |= PARAMETER_IS_ENABLED;
                        pData->param.data[j].hints |= PARAMETER_IS_AUTOMABLE;
                        needsCtrlIn = true;
                    }

                    // MIDI CC value
                    const LV2_RDF_PortMidiMap& portMidiMap(fRdfDescriptor->Ports[i].MidiMap);

                    if (LV2_IS_PORT_MIDI_MAP_CC(portMidiMap.Type))
                    {
                        if (portMidiMap.Number < 0x5F && ! MIDI_IS_CONTROL_BANK_SELECT(portMidiMap.Number))
                            pData->param.data[j].midiCC = int16_t(portMidiMap.Number);
                    }
                }
                else if (LV2_IS_PORT_OUTPUT(portTypes))
                {
                    pData->param.data[j].type = PARAMETER_OUTPUT;

                    if (LV2_IS_PORT_DESIGNATION_LATENCY(portDesignation))
                    {
                        min = 0.0f;
                        max = sampleRate;
                        def = 0.0f;
                        step = 1.0f;
                        stepSmall = 1.0f;
                        stepLarge = 1.0f;
                        pData->param.special[j] = PARAMETER_SPECIAL_LATENCY;
                    }
                    else if (LV2_IS_PORT_DESIGNATION_SAMPLE_RATE(portDesignation))
                    {
                        def = sampleRate;
                        step = 1.0f;
                        stepSmall = 1.0f;
                        stepLarge = 1.0f;
                        pData->param.special[j] = PARAMETER_SPECIAL_SAMPLE_RATE;
                    }
                    else if (LV2_IS_PORT_DESIGNATION_FREEWHEELING(portDesignation))
                    {
                        carla_stderr("Plugin has freewheeling output port, this should not happen!");
                    }
                    else if (LV2_IS_PORT_DESIGNATION_TIME(portDesignation))
                    {
                        pData->param.special[j] = PARAMETER_SPECIAL_LV2_TIME;
                    }
                    else
                    {
                        pData->param.data[j].hints |= PARAMETER_IS_ENABLED;
                        pData->param.data[j].hints |= PARAMETER_IS_AUTOMABLE;
                        needsCtrlOut = true;
                    }
                }
                else
                {
                    pData->param.data[j].type = PARAMETER_UNKNOWN;
                    carla_stderr2("WARNING - Got a broken Port (Control, but not input or output)");
                }

                // extra parameter hints
                if (LV2_IS_PORT_LOGARITHMIC(portProps))
                    pData->param.data[j].hints |= PARAMETER_IS_LOGARITHMIC;

                if (LV2_IS_PORT_TRIGGER(portProps))
                    pData->param.data[j].hints |= PARAMETER_IS_TRIGGER;

                if (LV2_IS_PORT_STRICT_BOUNDS(portProps))
                    pData->param.data[j].hints |= PARAMETER_IS_STRICT_BOUNDS;

                if (LV2_IS_PORT_ENUMERATION(portProps))
                    pData->param.data[j].hints |= PARAMETER_USES_SCALEPOINTS;

                // check if parameter is not enabled or automable
                if (LV2_IS_PORT_NOT_ON_GUI(portProps))
                    pData->param.data[j].hints &= ~(PARAMETER_IS_ENABLED|PARAMETER_IS_AUTOMABLE);
                else if (LV2_IS_PORT_CAUSES_ARTIFACTS(portProps) || LV2_IS_PORT_EXPENSIVE(portProps) || LV2_IS_PORT_NOT_AUTOMATIC(portProps))
                    pData->param.data[j].hints &= ~PARAMETER_IS_AUTOMABLE;

                pData->param.ranges[j].min = min;
                pData->param.ranges[j].max = max;
                pData->param.ranges[j].def = def;
                pData->param.ranges[j].step = step;
                pData->param.ranges[j].stepSmall = stepSmall;
                pData->param.ranges[j].stepLarge = stepLarge;

                // Start parameters in their default values (except freewheel, which is off by default)
                if (pData->param.data[j].type == PARAMETER_INPUT && pData->param.special[j] == PARAMETER_SPECIAL_LV2_FREEWHEEL)
                    fParamBuffers[j] = min;
                else
                    fParamBuffers[j] = def;

                fDescriptor->connect_port(fHandle, i, &fParamBuffers[j]);

                if (fHandle2 != nullptr)
                    fDescriptor->connect_port(fHandle2, i, &fParamBuffers[j]);
            }
            else
            {
                // Port Type not supported, but it's optional anyway
                fDescriptor->connect_port(fHandle, i, nullptr);

                if (fHandle2 != nullptr)
                    fDescriptor->connect_port(fHandle2, i, nullptr);
            }
        }

        if (needsCtrlIn)
        {
            portName.clear();

            if (processMode == ENGINE_PROCESS_MODE_SINGLE_CLIENT)
            {
                portName  = pData->name;
                portName += ":";
            }

            portName += "events-in";
            portName.truncate(portNameSize);

            pData->event.portIn = (CarlaEngineEventPort*)pData->client->addPort(kEnginePortTypeEvent, portName, true);
        }

        if (needsCtrlOut)
        {
            portName.clear();

            if (processMode == ENGINE_PROCESS_MODE_SINGLE_CLIENT)
            {
                portName  = pData->name;
                portName += ":";
            }

            portName += "events-out";
            portName.truncate(portNameSize);

            pData->event.portOut = (CarlaEngineEventPort*)pData->client->addPort(kEnginePortTypeEvent, portName, false);
        }

        if (forcedStereoIn || forcedStereoOut)
            pData->options |= PLUGIN_OPTION_FORCE_STEREO;
        else
            pData->options &= ~PLUGIN_OPTION_FORCE_STEREO;

        // plugin hints
        pData->hints = 0x0;

        if (isRealtimeSafe())
            pData->hints |= PLUGIN_IS_RTSAFE;

        if (LV2_IS_GENERATOR(fRdfDescriptor->Type[0], fRdfDescriptor->Type[1]))
            pData->hints |= PLUGIN_IS_SYNTH;

        if (aOuts > 0 && (aIns == aOuts || aIns == 1))
            pData->hints |= PLUGIN_CAN_DRYWET;

        if (aOuts > 0)
            pData->hints |= PLUGIN_CAN_VOLUME;

        if (aOuts >= 2 && aOuts % 2 == 0)
            pData->hints |= PLUGIN_CAN_BALANCE;

        // extra plugin hints
        pData->extraHints = 0x0;

        if (fExt.state != nullptr || fExt.worker != nullptr)
        {
            if ((aIns == 0 || aIns == 2) && (aOuts == 0 || aOuts == 2) && evIns.count() <= 1 && evOuts.count() <= 1)
                pData->extraHints |= PLUGIN_EXTRA_HINT_CAN_RUN_RACK;
        }
        else
        {
            if (aIns <= 2 && aOuts <= 2 && (aIns == aOuts || aIns == 0 || aOuts == 0) && evIns.count() <= 1 && evOuts.count() <= 1)
                pData->extraHints |= PLUGIN_EXTRA_HINT_CAN_RUN_RACK;
        }

        bufferSizeChanged(pData->engine->getBufferSize());
        reloadPrograms(true);

        // check latency
        // TODO

        evIns.clear();
        evOuts.clear();

        if (pData->active)
            activate();

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

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

    void activate() noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fDescriptor != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(fHandle != nullptr,);

        if (fDescriptor->activate != nullptr)
        {
            try {
                fDescriptor->activate(fHandle);
            } catch(...) {}

            if (fHandle2 != nullptr)
            {
                try {
                    fDescriptor->activate(fHandle2);
                } catch(...) {}
            }
        }

        fFirstActive = true;
    }

    void deactivate() noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fDescriptor != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(fHandle != nullptr,);

        if (fDescriptor->deactivate != nullptr)
        {
            try {
                fDescriptor->deactivate(fHandle);
            } catch(...) {}

            if (fHandle2 != nullptr)
            {
                try {
                    fDescriptor->deactivate(fHandle2);
                } catch(...) {}
            }
        }
    }

    void process(float** const inBuffer, float** const outBuffer, const uint32_t frames) override
    {
        // --------------------------------------------------------------------------------------------------------
        // Check if active

        if (! pData->active)
        {
            // disable any output sound
            for (uint32_t i=0; i < pData->audioOut.count; ++i)
                FLOAT_CLEAR(outBuffer[i], frames);
            return;
        }

        // --------------------------------------------------------------------------------------------------------
        // Check if needs reset

        if (pData->needsReset)
        {
            if (pData->latency > 0)
            {
                for (uint32_t i=0; i < pData->audioIn.count; ++i)
                    FLOAT_CLEAR(pData->latencyBuffers[i], pData->latency);
            }

            pData->needsReset = false;
        }

        // --------------------------------------------------------------------------------------------------------
        // TimeInfo

        const EngineTimeInfo& timeInfo(pData->engine->getTimeInfo());

        if (fFirstActive || fLastTimeInfo != timeInfo)
        {
            bool doPostRt;
            int32_t rindex;

            // update input ports
            for (uint32_t k=0; k < pData->param.count; ++k)
            {
                if (pData->param.data[k].type != PARAMETER_INPUT)
                    continue;
                if (pData->param.special[k] != PARAMETER_SPECIAL_LV2_TIME)
                    continue;

                doPostRt = false;
                rindex = pData->param.data[k].rindex;

                CARLA_SAFE_ASSERT_CONTINUE(rindex >= 0 && rindex < static_cast<int32_t>(fRdfDescriptor->PortCount));

                switch (fRdfDescriptor->Ports[rindex].Designation)
                {
                // Non-BBT
                case LV2_PORT_DESIGNATION_TIME_SPEED:
                    if (fLastTimeInfo.playing != timeInfo.playing)
                    {
                        fParamBuffers[k] = timeInfo.playing ? 1.0f : 0.0f;
                        doPostRt = true;
                    }
                    break;
                case LV2_PORT_DESIGNATION_TIME_FRAME:
                    if (fLastTimeInfo.frame != timeInfo.frame)
                    {
                        fParamBuffers[k] = float(timeInfo.frame);
                        doPostRt = true;
                    }
                    break;
                case LV2_PORT_DESIGNATION_TIME_FRAMES_PER_SECOND:
                    break;

                // BBT
                case LV2_PORT_DESIGNATION_TIME_BAR:
                    if ((timeInfo.valid & EngineTimeInfo::kValidBBT) != 0 && fLastTimeInfo.bbt.bar != timeInfo.bbt.bar)
                    {
                        fParamBuffers[k] = float(timeInfo.bbt.bar - 1);
                        doPostRt = true;
                    }
                    break;
                case LV2_PORT_DESIGNATION_TIME_BAR_BEAT:
                    if ((timeInfo.valid & EngineTimeInfo::kValidBBT) != 0 && (fLastTimeInfo.bbt.tick != timeInfo.bbt.tick ||
                                                                              fLastTimeInfo.bbt.ticksPerBeat != timeInfo.bbt.ticksPerBeat))
                    {
                        fParamBuffers[k] = float(double(timeInfo.bbt.beat) - 1.0 + (double(timeInfo.bbt.tick) / timeInfo.bbt.ticksPerBeat));
                        doPostRt = true;
                    }
                    break;
                case LV2_PORT_DESIGNATION_TIME_BEAT:
                    if ((timeInfo.valid & EngineTimeInfo::kValidBBT) != 0 && fLastTimeInfo.bbt.beat != timeInfo.bbt.beat)
                    {
                        fParamBuffers[k] = float(timeInfo.bbt.beat - 1);
                        doPostRt = true;
                    }
                    break;
                case LV2_PORT_DESIGNATION_TIME_BEAT_UNIT:
                    if ((timeInfo.valid & EngineTimeInfo::kValidBBT) != 0 && fLastTimeInfo.bbt.beatType != timeInfo.bbt.beatType)
                    {
                        fParamBuffers[k] = timeInfo.bbt.beatType;
                        doPostRt = true;
                    }
                    break;
                case LV2_PORT_DESIGNATION_TIME_BEATS_PER_BAR:
                    if ((timeInfo.valid & EngineTimeInfo::kValidBBT) != 0 && fLastTimeInfo.bbt.beatsPerBar != timeInfo.bbt.beatsPerBar)
                    {
                        fParamBuffers[k] = timeInfo.bbt.beatsPerBar;
                        doPostRt = true;
                    }
                    break;
                case LV2_PORT_DESIGNATION_TIME_BEATS_PER_MINUTE:
                    if ((timeInfo.valid & EngineTimeInfo::kValidBBT) != 0 && fLastTimeInfo.bbt.beatsPerMinute != timeInfo.bbt.beatsPerMinute)
                    {
                        fParamBuffers[k] = float(timeInfo.bbt.beatsPerMinute);
                        doPostRt = true;
                    }
                    break;
                }

                if (doPostRt)
                    pData->postponeRtEvent(kPluginPostRtEventParameterChange, static_cast<int32_t>(k), 1, fParamBuffers[k]);
            }

            pData->postRtEvents.trySplice();

            carla_copyStruct<EngineTimeInfo>(fLastTimeInfo, timeInfo);

            CARLA_PROCESS_CONTINUE_CHECK;
        }

        // --------------------------------------------------------------------------------------------------------
        // Plugin processing (no events)

        {
            processSingle(inBuffer, outBuffer, frames, 0);

        } // End of Plugin processing (no events)

        CARLA_PROCESS_CONTINUE_CHECK;

        // --------------------------------------------------------------------------------------------------------
        // Control Output

        if (pData->event.portOut != nullptr)
        {
            uint8_t  channel;
            uint16_t param;
            float    value;

            for (uint32_t k=0; k < pData->param.count; ++k)
            {
                if (pData->param.data[k].type != PARAMETER_OUTPUT)
                    continue;

                pData->param.ranges[k].fixValue(fParamBuffers[k]);

                if (pData->param.data[k].midiCC > 0)
                {
                    channel = pData->param.data[k].midiChannel;
                    param   = static_cast<uint16_t>(pData->param.data[k].midiCC);
                    value   = pData->param.ranges[k].getNormalizedValue(fParamBuffers[k]);
                    pData->event.portOut->writeControlEvent(0, channel, kEngineControlEventTypeParameter, param, value);
                }
            }
        } // End of Control Output

        CARLA_PROCESS_CONTINUE_CHECK;

        // --------------------------------------------------------------------------------------------------------
        // Final work

        if (fExt.worker != nullptr && fExt.worker->end_run != nullptr)
        {
            fExt.worker->end_run(fHandle);

            if (fHandle2 != nullptr)
                fExt.worker->end_run(fHandle2);
        }

        fFirstActive = false;

        // --------------------------------------------------------------------------------------------------------
    }

    bool processSingle(float** const inBuffer, float** const outBuffer, const uint32_t frames, const uint32_t timeOffset)
    {
        CARLA_SAFE_ASSERT_RETURN(frames > 0, false);

        if (pData->audioIn.count > 0)
        {
            CARLA_SAFE_ASSERT_RETURN(inBuffer != nullptr, false);
        }
        if (pData->audioOut.count > 0)
        {
            CARLA_SAFE_ASSERT_RETURN(outBuffer != nullptr, false);
        }

        // --------------------------------------------------------------------------------------------------------
        // Try lock, silence otherwise

        if (pData->engine->isOffline())
        {
            pData->singleMutex.lock();
        }
        else if (! pData->singleMutex.tryLock())
        {
            for (uint32_t i=0; i < pData->audioOut.count; ++i)
            {
                for (uint32_t k=0; k < frames; ++k)
                    outBuffer[i][k+timeOffset] = 0.0f;
            }

            return false;
        }

        // --------------------------------------------------------------------------------------------------------
        // Reset audio buffers

        for (uint32_t i=0; i < pData->audioIn.count; ++i)
            FLOAT_COPY(fAudioInBuffers[i], inBuffer[i]+timeOffset, frames);

        for (uint32_t i=0; i < pData->audioOut.count; ++i)
            FLOAT_CLEAR(fAudioOutBuffers[i], frames);

        // --------------------------------------------------------------------------------------------------------
        // Run plugin

        fDescriptor->run(fHandle, frames);

        if (fHandle2 != nullptr)
            fDescriptor->run(fHandle2, frames);

        // --------------------------------------------------------------------------------------------------------
        // Handle trigger parameters

        for (uint32_t k=0; k < pData->param.count; ++k)
        {
            if (pData->param.data[k].type != PARAMETER_INPUT)
                continue;

            if (pData->param.data[k].hints & PARAMETER_IS_TRIGGER)
            {
                if (fParamBuffers[k] != pData->param.ranges[k].def)
                {
                    fParamBuffers[k] = pData->param.ranges[k].def;
                    pData->postponeRtEvent(kPluginPostRtEventParameterChange, static_cast<int32_t>(k), 0, fParamBuffers[k]);
                }
            }
        }

        pData->postRtEvents.trySplice();

#ifndef BUILD_BRIDGE
        // --------------------------------------------------------------------------------------------------------
        // Post-processing (dry/wet, volume and balance)

        {
            const bool doDryWet  = (pData->hints & PLUGIN_CAN_DRYWET) != 0 && pData->postProc.dryWet != 1.0f;
            const bool doBalance = (pData->hints & PLUGIN_CAN_BALANCE) != 0 && (pData->postProc.balanceLeft != -1.0f || pData->postProc.balanceRight != 1.0f);

            bool isPair;
            float bufValue, oldBufLeft[doBalance ? frames : 1];

            for (uint32_t i=0; i < pData->audioOut.count; ++i)
            {
                // Dry/Wet
                if (doDryWet)
                {
                    for (uint32_t k=0; k < frames; ++k)
                    {
                        // TODO
                        //if (k < pData->latency && pData->latency < frames)
                        //    bufValue = (pData->audioIn.count == 1) ? pData->latencyBuffers[0][k] : pData->latencyBuffers[i][k];
                        //else
                        //    bufValue = (pData->audioIn.count == 1) ? inBuffer[0][k-m_latency] : inBuffer[i][k-m_latency];

                        bufValue = fAudioInBuffers[(pData->audioIn.count == 1) ? 0 : i][k];
                        fAudioOutBuffers[i][k] = (fAudioOutBuffers[i][k] * pData->postProc.dryWet) + (bufValue * (1.0f - pData->postProc.dryWet));
                    }
                }

                // Balance
                if (doBalance)
                {
                    isPair = (i % 2 == 0);

                    if (isPair)
                    {
                        CARLA_ASSERT(i+1 < pData->audioOut.count);
                        FLOAT_COPY(oldBufLeft, fAudioOutBuffers[i], frames);
                    }

                    float balRangeL = (pData->postProc.balanceLeft  + 1.0f)/2.0f;
                    float balRangeR = (pData->postProc.balanceRight + 1.0f)/2.0f;

                    for (uint32_t k=0; k < frames; ++k)
                    {
                        if (isPair)
                        {
                            // left
                            fAudioOutBuffers[i][k]  = oldBufLeft[k]            * (1.0f - balRangeL);
                            fAudioOutBuffers[i][k] += fAudioOutBuffers[i+1][k] * (1.0f - balRangeR);
                        }
                        else
                        {
                            // right
                            fAudioOutBuffers[i][k]  = fAudioOutBuffers[i][k] * balRangeR;
                            fAudioOutBuffers[i][k] += oldBufLeft[k]          * balRangeL;
                        }
                    }
                }

                // Volume (and buffer copy)
                {
                    for (uint32_t k=0; k < frames; ++k)
                        outBuffer[i][k+timeOffset] = fAudioOutBuffers[i][k] * pData->postProc.volume;
                }
            }
        } // End of Post-processing
#else // BUILD_BRIDGE
        for (uint32_t i=0; i < pData->audioOut.count; ++i)
        {
            for (uint32_t k=0; k < frames; ++k)
                outBuffer[i][k+timeOffset] = fAudioOutBuffers[i][k];
        }
#endif

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

        pData->singleMutex.unlock();
        return true;
    }

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

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

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

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

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

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

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

        const int newBufferSizeInt(static_cast<int>(newBufferSize));

        if (fLv2Options.maxBufferSize != newBufferSizeInt || (fLv2Options.minBufferSize != 1 && fLv2Options.minBufferSize != newBufferSizeInt))
        {
            fLv2Options.maxBufferSize = newBufferSizeInt;

            if (fLv2Options.minBufferSize != 1)
                fLv2Options.minBufferSize = newBufferSizeInt;

            if (fExt.options != nullptr && fExt.options->set != nullptr)
            {
                fExt.options->set(fHandle, &fLv2Options.opts[Lv2PluginOptions::MaxBlockLenth]);
                fExt.options->set(fHandle, &fLv2Options.opts[Lv2PluginOptions::MinBlockLenth]);
            }
        }

        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);

        if (fLv2Options.sampleRate != newSampleRate)
        {
            fLv2Options.sampleRate = newSampleRate;

            if (fExt.options != nullptr && fExt.options->set != nullptr)
                fExt.options->set(fHandle, &fLv2Options.opts[Lv2PluginOptions::SampleRate]);
        }

        for (uint32_t k=0; k < pData->param.count; ++k)
        {
            if (pData->param.data[k].type == PARAMETER_INPUT && pData->param.special[k] == PARAMETER_SPECIAL_SAMPLE_RATE)
            {
                fParamBuffers[k] = static_cast<float>(newSampleRate);
                pData->postponeRtEvent(kPluginPostRtEventParameterChange, static_cast<int32_t>(k), 1, fParamBuffers[k]);
                break;
            }
        }

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

    void offlineModeChanged(const bool isOffline) override
    {
        for (uint32_t k=0; k < pData->param.count; ++k)
        {
            if (pData->param.data[k].type == PARAMETER_INPUT && pData->param.special[k] == PARAMETER_SPECIAL_LV2_FREEWHEEL)
            {
                fParamBuffers[k] = isOffline ? pData->param.ranges[k].max : pData->param.ranges[k].min;
                pData->postponeRtEvent(kPluginPostRtEventParameterChange, static_cast<int32_t>(k), 1, fParamBuffers[k]);
                break;
            }
        }
    }

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

    void initBuffers() override
    {
        //fEventsIn.initBuffers(pData->engine);
        //fEventsOut.initBuffers(pData->engine);

        CarlaPlugin::initBuffers();
    }

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

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

            delete[] fAudioOutBuffers;
            fAudioOutBuffers = nullptr;
        }

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

        //fEventsIn.clear();
        //fEventsOut.clear();

        CarlaPlugin::clearBuffers();

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

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

    bool isRealtimeSafe() const noexcept
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, false);

        for (uint32_t i=0; i < fRdfDescriptor->FeatureCount; ++i)
        {
            if (std::strcmp(fRdfDescriptor->Features[i].URI, LV2_CORE__hardRTCapable) == 0)
                return true;
        }

        return false;
    }

    bool needsFixedBuffer() const noexcept
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr, false);

        for (uint32_t i=0; i < fRdfDescriptor->FeatureCount; ++i)
        {
            if (std::strcmp(fRdfDescriptor->Features[i].URI, LV2_BUF_SIZE__fixedBlockLength) == 0)
                return true;
        }

        return false;
    }

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

    bool isUiBridgeable(const uint32_t uiId) const noexcept
    {
        CARLA_SAFE_ASSERT_RETURN(uiId < fRdfDescriptor->UICount, false);

        const LV2_RDF_UI* const rdfUi(&fRdfDescriptor->UIs[uiId]);

        for (uint32_t i=0; i < rdfUi->FeatureCount; ++i)
        {
            if (std::strcmp(rdfUi->Features[i].URI, LV2_INSTANCE_ACCESS_URI) == 0)
                return false;
            if (std::strcmp(rdfUi->Features[i].URI, LV2_DATA_ACCESS_URI) == 0)
                return false;
        }

        return true;
    }

    bool isUiResizable() const noexcept
    {
        CARLA_SAFE_ASSERT_RETURN(fUi.rdfDescriptor != nullptr, false);

        for (uint32_t i=0; i < fUi.rdfDescriptor->FeatureCount; ++i)
        {
            if (std::strcmp(fUi.rdfDescriptor->Features[i].URI, LV2_UI__fixedSize) == 0)
                return false;
            if (std::strcmp(fUi.rdfDescriptor->Features[i].URI, LV2_UI__noUserResize) == 0)
                return false;
        }

        return true;
    }

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

    void recheckExtensions()
    {
        CARLA_SAFE_ASSERT_RETURN(fRdfDescriptor != nullptr,);

        fExt.options  = nullptr;
        fExt.programs = nullptr;
        fExt.state    = nullptr;
        fExt.worker   = nullptr;

        for (uint32_t i=0; i < fRdfDescriptor->ExtensionCount; ++i)
        {
            if (std::strcmp(fRdfDescriptor->Extensions[i], LV2_OPTIONS__interface) == 0)
                pData->hints |= PLUGIN_HAS_EXTENSION_OPTIONS;
            else if (std::strcmp(fRdfDescriptor->Extensions[i], LV2_PROGRAMS__Interface) == 0)
                pData->hints |= PLUGIN_HAS_EXTENSION_PROGRAMS;
            else if (std::strcmp(fRdfDescriptor->Extensions[i], LV2_STATE__interface) == 0)
                pData->hints |= PLUGIN_HAS_EXTENSION_STATE;
            else if (std::strcmp(fRdfDescriptor->Extensions[i], LV2_WORKER__interface) == 0)
                pData->hints |= PLUGIN_HAS_EXTENSION_WORKER;
            else
                carla_stdout("Plugin has non-supported extension: '%s'", fRdfDescriptor->Extensions[i]);
        }

        if (fDescriptor->extension_data != nullptr)
        {
            if (pData->hints & PLUGIN_HAS_EXTENSION_OPTIONS)
                fExt.options = (const LV2_Options_Interface*)fDescriptor->extension_data(LV2_OPTIONS__interface);

            if (pData->hints & PLUGIN_HAS_EXTENSION_PROGRAMS)
                fExt.programs = (const LV2_Programs_Interface*)fDescriptor->extension_data(LV2_PROGRAMS__Interface);

            if (pData->hints & PLUGIN_HAS_EXTENSION_STATE)
                fExt.state = (const LV2_State_Interface*)fDescriptor->extension_data(LV2_STATE__interface);

            if (pData->hints & PLUGIN_HAS_EXTENSION_WORKER)
                fExt.worker = (const LV2_Worker_Interface*)fDescriptor->extension_data(LV2_WORKER__interface);

            // check if invalid
            if (fExt.options != nullptr && fExt.options->get == nullptr  && fExt.options->set == nullptr)
                fExt.options = nullptr;

            if (fExt.programs != nullptr && (fExt.programs->get_program == nullptr || fExt.programs->select_program == nullptr))
                fExt.programs = nullptr;

            if (fExt.state != nullptr && (fExt.state->save == nullptr || fExt.state->restore == nullptr))
                fExt.state = nullptr;

            if (fExt.worker != nullptr && fExt.worker->work == nullptr)
                fExt.worker = nullptr;
        }
    }

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

    void updateUi()
    {
        CARLA_SAFE_ASSERT_RETURN(fUi.handle != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(fUi.descriptor != nullptr,);

        fExt.uiidle = nullptr;
        fExt.uiprograms = nullptr;

        if (fUi.descriptor->extension_data != nullptr)
        {
            fExt.uiidle     = (const LV2UI_Idle_Interface*)fUi.descriptor->extension_data(LV2_UI__idleInterface);
            fExt.uiprograms = (const LV2_Programs_UI_Interface*)fUi.descriptor->extension_data(LV2_PROGRAMS__UIInterface);

            // check if invalid
            if (fExt.uiidle != nullptr && fExt.uiidle->idle == nullptr)
                fExt.uiidle = nullptr;

            if (fExt.uiprograms != nullptr && fExt.uiprograms->select_program == nullptr)
                fExt.uiprograms = nullptr;
        }

        // update midi program
        if (fExt.uiprograms != nullptr && pData->midiprog.count > 0 && pData->midiprog.current >= 0)
        {
            const MidiProgramData& curData(pData->midiprog.getCurrent());
            fExt.uiprograms->select_program(fUi.handle, curData.bank, curData.program);
        }

        // update control ports
        if (fUi.descriptor->port_event != nullptr)
        {
            float value;
            for (uint32_t i=0; i < pData->param.count; ++i)
            {
                value = getParameterValue(i);
                fUi.descriptor->port_event(fUi.handle, static_cast<uint32_t>(pData->param.data[i].rindex), sizeof(float), CARLA_URI_MAP_ID_NULL, &value);
            }
        }
    }

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

    LV2_URID getCustomURID(const char* const uri)
    {
        CARLA_SAFE_ASSERT_RETURN(uri != nullptr && uri[0] != '\0', CARLA_URI_MAP_ID_NULL);
        carla_debug("Lv2Plugin::getCustomURID(\"%s\")", uri);

        for (size_t i=0; i < fCustomURIDs.count(); ++i)
        {
            const char*& thisUri(fCustomURIDs.getAt(i));
            if (thisUri != nullptr && std::strcmp(thisUri, uri) == 0)
                return static_cast<LV2_URID>(i);
        }

        const LV2_URID urid(static_cast<LV2_URID>(fCustomURIDs.count()));

        fCustomURIDs.append(carla_strdup(uri));

#if 0
        if (fUi.type == PLUGIN_UI_OSC && kData->osc.data.target != nullptr)
            osc_send_lv2_urid_map(&kData->osc.data, urid, uri);
#endif

        return urid;
    }

    const char* getCustomURIDString(const LV2_URID urid) const noexcept
    {
        CARLA_SAFE_ASSERT_RETURN(urid != CARLA_URI_MAP_ID_NULL, nullptr);
        CARLA_SAFE_ASSERT_RETURN(urid < fCustomURIDs.count(), nullptr);
        carla_debug("Lv2Plugin::getCustomURIString(%i)", urid);

        return fCustomURIDs.getAt(urid);
    }

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

    void handleProgramChanged(const int32_t index)
    {
        CARLA_SAFE_ASSERT_RETURN(index >= -1,);
        carla_debug("Lv2Plugin::handleProgramChanged(%i)", index);

        if (index == -1)
        {
            const ScopedSingleProcessLocker spl(this, true);
            return reloadPrograms(false);
        }

        if (index < static_cast<int32_t>(pData->midiprog.count) && fExt.programs != nullptr && fExt.programs->get_program != nullptr)
        {
            if (const LV2_Program_Descriptor* const progDesc = fExt.programs->get_program(fHandle, static_cast<uint32_t>(index)))
            {
                CARLA_SAFE_ASSERT_RETURN(progDesc->name != nullptr,);

                if (pData->midiprog.data[index].name != nullptr)
                    delete[] pData->midiprog.data[index].name;

                pData->midiprog.data[index].name = carla_strdup(progDesc->name);

                if (index == pData->midiprog.current)
                    pData->engine->callback(ENGINE_CALLBACK_UPDATE, pData->id, 0, 0, 0.0, nullptr);
                else
                    pData->engine->callback(ENGINE_CALLBACK_RELOAD_PROGRAMS, pData->id, 0, 0, 0.0, nullptr);
            }
        }
    }

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

    LV2_State_Status handleStateStore(const uint32_t key, const void* const value, const size_t size, const uint32_t type, const uint32_t flags)
    {
        CARLA_SAFE_ASSERT_RETURN(key != CARLA_URI_MAP_ID_NULL, LV2_STATE_ERR_NO_PROPERTY);
        CARLA_SAFE_ASSERT_RETURN(value != nullptr, LV2_STATE_ERR_NO_PROPERTY);
        CARLA_SAFE_ASSERT_RETURN(size > 0, LV2_STATE_ERR_NO_PROPERTY);
        CARLA_SAFE_ASSERT_RETURN(type != CARLA_URI_MAP_ID_NULL, LV2_STATE_ERR_BAD_TYPE);
        CARLA_SAFE_ASSERT_RETURN(flags & LV2_STATE_IS_POD, LV2_STATE_ERR_BAD_FLAGS);
        carla_debug("Lv2Plugin::handleStateStore(%i, %p, " P_SIZE ", %i, %i)", key, value, size, type, flags);

        const char* const skey(carla_lv2_urid_unmap(this, key));
        const char* const stype(carla_lv2_urid_unmap(this, type));

        CARLA_SAFE_ASSERT_RETURN(skey != nullptr, LV2_STATE_ERR_BAD_TYPE);
        CARLA_SAFE_ASSERT_RETURN(stype != nullptr, LV2_STATE_ERR_BAD_TYPE);

        // Check if we already have this key
        for (LinkedList<CustomData>::Itenerator it = pData->custom.begin(); it.valid(); it.next())
        {
            CustomData& data(it.getValue());

            if (std::strcmp(data.key, skey) == 0)
            {
                // found it
                if (data.value != nullptr)
                    delete[] data.value;

                if (type == CARLA_URI_MAP_ID_ATOM_STRING || type == CARLA_URI_MAP_ID_ATOM_PATH)
                    data.value = carla_strdup((const char*)value);
                else
                    data.value = carla_strdup(QByteArray((const char*)value, static_cast<int>(size)).toBase64().constData());

                return LV2_STATE_SUCCESS;
            }
        }

        // Otherwise store it
        CustomData newData;
        newData.type = carla_strdup(stype);
        newData.key  = carla_strdup(skey);

        if (type == CARLA_URI_MAP_ID_ATOM_STRING || type == CARLA_URI_MAP_ID_ATOM_PATH)
            newData.value = carla_strdup((const char*)value);
        else
            newData.value = carla_strdup(QByteArray((const char*)value, static_cast<int>(size)).toBase64().constData());

        pData->custom.append(newData);

        return LV2_STATE_SUCCESS;
    }

    const void* handleStateRetrieve(const uint32_t key, size_t* const size, uint32_t* const type, uint32_t* const flags)
    {
        CARLA_SAFE_ASSERT_RETURN(key != CARLA_URI_MAP_ID_NULL, nullptr);
        CARLA_SAFE_ASSERT_RETURN(size != nullptr, nullptr);
        CARLA_SAFE_ASSERT_RETURN(type != nullptr, nullptr);
        CARLA_SAFE_ASSERT_RETURN(flags != nullptr, nullptr);
        carla_debug("Lv2Plugin::handleStateRetrieve(%i, %p, %p, %p)", key, size, type, flags);

        const char* const skey(carla_lv2_urid_unmap(this, key));

        CARLA_SAFE_ASSERT_RETURN(skey != nullptr, nullptr);

        const char* stype = nullptr;
        const char* stringData = nullptr;

        for (LinkedList<CustomData>::Itenerator it = pData->custom.begin(); it.valid(); it.next())
        {
            const CustomData& data(it.getValue());

            if (std::strcmp(data.key, skey) == 0)
            {
                stype      = data.type;
                stringData = data.value;
                break;
            }
        }

        CARLA_SAFE_ASSERT_RETURN(stype != nullptr, nullptr);
        CARLA_SAFE_ASSERT_RETURN(stringData != nullptr, nullptr);

        *type  = carla_lv2_urid_map(this, stype);
        *flags = LV2_STATE_IS_POD;

        if (*type == CARLA_URI_MAP_ID_ATOM_STRING || *type == CARLA_URI_MAP_ID_ATOM_PATH)
        {
            *size = std::strlen(stringData);
            return stringData;
        }
        else
        {
            static QByteArray chunk; // FIXME
            chunk = QByteArray::fromBase64(stringData);
            CARLA_SAFE_ASSERT_RETURN(chunk.size() > 0, nullptr);
            *size = static_cast<size_t>(chunk.size());
            return chunk.constData();
        }
    }

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

    LV2_Worker_Status handleWorkerSchedule(const uint32_t size, const void* const data)
    {
        CARLA_SAFE_ASSERT_RETURN(fExt.worker != nullptr && fExt.worker->work != nullptr, LV2_WORKER_ERR_UNKNOWN);
        carla_stdout("Lv2Plugin::handleWorkerSchedule(%i, %p)", size, data);

        //if (pData->engine->isOffline())
            fExt.worker->work(fHandle, carla_lv2_worker_respond, this, size, data);
        //else
        //   postponeEvent(PluginPostEventCustom, size, 0, 0.0, data);

        return LV2_WORKER_SUCCESS;
    }

    LV2_Worker_Status handleWorkerRespond(const uint32_t size, const void* const data)
    {
        carla_stdout("Lv2Plugin::handleWorkerRespond(%i, %p)", size, data);

#if 0
        LV2_Atom_Worker workerAtom;
        workerAtom.atom.type = CARLA_URI_MAP_ID_ATOM_WORKER;
        workerAtom.atom.size = sizeof(LV2_Atom_Worker_Body);
        workerAtom.body.size = size;
        workerAtom.body.data = data;

        atomQueueIn.put(0, (const LV2_Atom*)&workerAtom);
#endif

        return LV2_WORKER_SUCCESS;
    }

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

public:
    bool init(const char* const bundle, const char* const name, const char* const uri)
    {
        CARLA_SAFE_ASSERT_RETURN(pData->engine != nullptr, false);

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

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

        if (bundle == nullptr || bundle[0] == '\0')
        {
            pData->engine->setLastError("null bundle");
            return false;
        }

        if (uri == nullptr || uri[0] == '\0')
        {
            pData->engine->setLastError("null uri");
            return false;
        }

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

        Lv2WorldClass& lv2World(Lv2WorldClass::getInstance());

        // Convert bundle filename to URI
        QString qBundle(QUrl::fromLocalFile(bundle).toString());
        if (! qBundle.endsWith(OS_SEP_STR))
            qBundle += OS_SEP_STR;

        // Load bundle
        Lilv::Node lilvBundle(lv2World.new_uri(qBundle.toUtf8().constData()));
        lv2World.load_bundle(lilvBundle);

        fRdfDescriptor = lv2_rdf_new(uri, true);

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

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

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

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

        const LV2_Descriptor_Function descFn = (LV2_Descriptor_Function)pData->libSymbol("lv2_descriptor");

        if (descFn == nullptr)
        {
            pData->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)
        {
            pData->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 j=0; j < fRdfDescriptor->PortCount; ++j)
        {
            const LV2_Property portTypes(fRdfDescriptor->Ports[j].Types);

            if (! is_lv2_port_supported(portTypes))
            {
                if (! LV2_IS_PORT_OPTIONAL(fRdfDescriptor->Ports[j].Properties))
                {
                    pData->engine->setLastError("Plugin requires a port type that is not currently supported");
                    canContinue = false;
                    break;
                }
            }
        }

        // Check supported features
        for (uint32_t j=0; j < fRdfDescriptor->FeatureCount && canContinue; ++j)
        {
            if (! is_lv2_feature_supported(fRdfDescriptor->Features[j].URI))
            {
                QString msg(QString("Plugin wants a feature that is not supported:\n%1").arg(fRdfDescriptor->Features[j].URI));

                if (LV2_IS_FEATURE_REQUIRED(fRdfDescriptor->Features[j].Type))
                {
                    canContinue = false;
                    pData->engine->setLastError(msg.toUtf8().constData());
                    break;
                }
                else
                    carla_stderr("%s", msg.toUtf8().constData());
            }
        }

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

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

        if (name != nullptr && name[0] != '\0')
            pData->name = pData->engine->getUniquePluginName(name);
        else
            pData->name = pData->engine->getUniquePluginName(fRdfDescriptor->Name);

        pData->filename = carla_strdup(bundle);

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

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

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

        // ---------------------------------------------------------------
        // initialize options

        fLv2Options.minBufferSize = 1;
        fLv2Options.maxBufferSize = static_cast<int>(pData->engine->getBufferSize());
        fLv2Options.sampleRate    = pData->engine->getSampleRate();

        // ---------------------------------------------------------------
        // 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)

        for (uint32_t j=0; j < kFeatureCountPlugin; ++j)
            fFeatures[j] = new LV2_Feature;

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

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

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

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

        fFeatures[kFeatureIdHardRtCapable]->URI  = LV2_CORE__hardRTCapable;
        fFeatures[kFeatureIdHardRtCapable]->data = nullptr;

        fFeatures[kFeatureIdInPlaceBroken]->URI  = LV2_CORE__inPlaceBroken;
        fFeatures[kFeatureIdInPlaceBroken]->data = nullptr;

        fFeatures[kFeatureIdIsLive]->URI         = LV2_CORE__isLive;
        fFeatures[kFeatureIdIsLive]->data        = nullptr;

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

        fFeatures[kFeatureIdOptions]->URI    = LV2_OPTIONS__options;
        fFeatures[kFeatureIdOptions]->data   = fLv2Options.opts;

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

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

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

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

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

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

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

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

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

        // if a fixed buffer is not needed, skip its feature
        if (! needsFixedBuffer())
            fFeatures[kFeatureIdBufSizeFixed]->URI = LV2_BUF_SIZE__boundedBlockLength;

        // if power of 2 is not possible, skip its feature FIXME
        //if (fLv2Options.maxBufferSize)
        //    fFeatures[kFeatureIdBufSizePowerOf2]->URI = LV2_BUF_SIZE__boundedBlockLength;

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

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

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

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

        {
            // set default options
            pData->options = 0x0;

            pData->options |= PLUGIN_OPTION_MAP_PROGRAM_CHANGES;

            if (getMidiInCount() > 0 || needsFixedBuffer())
                pData->options |= PLUGIN_OPTION_FIXED_BUFFERS;

            if (pData->engine->getOptions().forceStereo)
                pData->options |= PLUGIN_OPTION_FORCE_STEREO;

            if (getMidiInCount() > 0)
            {
                pData->options |= PLUGIN_OPTION_SEND_CHANNEL_PRESSURE;
                pData->options |= PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH;
                pData->options |= PLUGIN_OPTION_SEND_PITCHBEND;
                pData->options |= PLUGIN_OPTION_SEND_ALL_SOUND_OFF;
            }

            // set identifier string
            CarlaString identifier("LV2/");
            identifier += uri;

            // load settings
            pData->options = pData->loadSettings(pData->options, getOptionsAvailable());

            // ignore settings, we need this anyway
            if (getMidiInCount() > 0 || needsFixedBuffer())
                pData->options |= PLUGIN_OPTION_FIXED_BUFFERS;
        }

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

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

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

        return true;
    }

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

    void handleTransferAtom(const uint32_t portIndex, const LV2_Atom* const atom)
    {
        CARLA_SAFE_ASSERT_RETURN(atom != nullptr,);
        carla_debug("Lv2Plugin::handleTransferAtom(%i, %p)", portIndex, atom);

        //fAtomQueueIn.put(portIndex, atom);
        return; (void)portIndex;
    }

    void handleUridMap(const LV2_URID urid, const char* const uri)
    {
        CARLA_SAFE_ASSERT_RETURN(urid != CARLA_URI_MAP_ID_NULL,);
        CARLA_SAFE_ASSERT_RETURN(uri != nullptr && uri[0] != '\0',);
        CARLA_SAFE_ASSERT_RETURN(urid == fCustomURIDs.count(),);
        carla_debug("Lv2Plugin::handleUridMap(%i, \"%s\")", urid, uri);

        fCustomURIDs.append(carla_strdup(uri));
    }

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

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

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

    Lv2PluginOptions fLv2Options;

    LinkedList<const char*> fCustomURIDs;

    bool fFirstActive; // first process() call after activate()
    EngineTimeInfo fLastTimeInfo;

    struct Extensions {
        const LV2_Options_Interface* options;
        const LV2_State_Interface* state;
        const LV2_Worker_Interface* worker;
        const LV2_Programs_Interface* programs;
        const LV2UI_Idle_Interface* uiidle;
        const LV2_Programs_UI_Interface* uiprograms;

        Extensions()
            : options(nullptr),
              state(nullptr),
              worker(nullptr),
              programs(nullptr),
              uiidle(nullptr),
              uiprograms(nullptr) {}
    } fExt;

    struct UI {
        enum Type {
            TYPE_NULL,
            TYPE_EMBED,
            TYPE_EXTERNAL,
            TYPE_OSC
        };

        Type type;
        LV2UI_Handle handle;
        LV2UI_Widget widget;
        const LV2UI_Descriptor* descriptor;
        const LV2_RDF_UI*       rdfDescriptor;

        UI()
            : type(TYPE_NULL),
              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_SAFE_ASSERT_RETURN(callback_data != nullptr, 0);
        CARLA_SAFE_ASSERT_RETURN(event != nullptr, 0);
        carla_debug("carla_lv2_event_ref(%p, %p)", callback_data, event);

        return 0;
    }

    static uint32_t carla_lv2_event_unref(LV2_Event_Callback_Data callback_data, LV2_Event* event)
    {
        CARLA_SAFE_ASSERT_RETURN(callback_data != nullptr, 0);
        CARLA_SAFE_ASSERT_RETURN(event != nullptr, 0);
        carla_debug("carla_lv2_event_unref(%p, %p)", callback_data, event);

        return 0;
    }

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

    static int carla_lv2_log_printf(LV2_Log_Handle handle, LV2_URID type, const char* fmt, ...)
    {
        CARLA_SAFE_ASSERT_RETURN(handle != nullptr, 0);
        CARLA_SAFE_ASSERT_RETURN(type != CARLA_URI_MAP_ID_NULL, 0);
        CARLA_SAFE_ASSERT_RETURN(fmt != nullptr, 0);

#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_SAFE_ASSERT_RETURN(handle != nullptr, 0);
        CARLA_SAFE_ASSERT_RETURN(type != CARLA_URI_MAP_ID_NULL, 0);
        CARLA_SAFE_ASSERT_RETURN(fmt != nullptr, 0);

#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:
            std::fprintf(stderr, "\x1b[31m");
            ret = std::vfprintf(stderr, fmt, ap);
            std::fprintf(stderr, "\x1b[0m");
            break;

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

        case CARLA_URI_MAP_ID_LOG_TRACE:
#ifdef DEBUG
            std::fprintf(stdout, "\x1b[30;1m");
            ret = std::vfprintf(stdout, fmt, ap);
            std::fprintf(stdout, "\x1b[0m");
#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_SAFE_ASSERT_RETURN(handle != nullptr,);
        carla_debug("carla_lv2_program_changed(%p, %i)", handle, index);

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

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

    static char* carla_lv2_state_make_path(LV2_State_Make_Path_Handle handle, const char* path)
    {
        CARLA_SAFE_ASSERT_RETURN(handle != nullptr, nullptr);
        CARLA_SAFE_ASSERT_RETURN(path != nullptr && path[0] != '\0', nullptr);
        carla_debug("carla_lv2_state_make_path(%p, \"%s\")", handle, path);

        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_SAFE_ASSERT_RETURN(handle != nullptr, nullptr);
        CARLA_SAFE_ASSERT_RETURN(absolute_path != nullptr && absolute_path[0] != '\0', nullptr);
        carla_debug("carla_lv2_state_map_abstract_path(%p, \"%s\")", handle, absolute_path);

        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_SAFE_ASSERT_RETURN(handle != nullptr, nullptr);
        CARLA_SAFE_ASSERT_RETURN(abstract_path != nullptr && abstract_path[0] != '\0', nullptr);
        carla_debug("carla_lv2_state_map_absolute_path(%p, \"%s\")", handle, abstract_path);

        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_SAFE_ASSERT_RETURN(handle != nullptr, LV2_STATE_ERR_UNKNOWN);
        carla_debug("carla_lv2_state_store(%p, %i, %p, " P_SIZE ", %i, %i)", handle, key, value, size, type, flags);

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

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

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

    // -------------------------------------------------------------------
    // 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);

        // unused
        (void)map;
    }

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

    static LV2_URID carla_lv2_urid_map(LV2_URID_Map_Handle handle, const char* uri)
    {
        CARLA_SAFE_ASSERT_RETURN(handle != nullptr, CARLA_URI_MAP_ID_NULL);
        CARLA_SAFE_ASSERT_RETURN(uri != nullptr && uri[0] != '\0', CARLA_URI_MAP_ID_NULL);
        carla_debug("carla_lv2_urid_map(%p, \"%s\")", handle, uri);

        // Atom types
        if (std::strcmp(uri, LV2_ATOM__Blank) == 0)
            return CARLA_URI_MAP_ID_ATOM_BLANK;
        if (std::strcmp(uri, LV2_ATOM__Bool) == 0)
            return CARLA_URI_MAP_ID_ATOM_BOOL;
        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__Float) == 0)
            return CARLA_URI_MAP_ID_ATOM_FLOAT;
        if (std::strcmp(uri, LV2_ATOM__Int) == 0)
            return CARLA_URI_MAP_ID_ATOM_INT;
        if (std::strcmp(uri, LV2_ATOM__Literal) == 0)
            return CARLA_URI_MAP_ID_ATOM_LITERAL;
        if (std::strcmp(uri, LV2_ATOM__Long) == 0)
            return CARLA_URI_MAP_ID_ATOM_LONG;
        if (std::strcmp(uri, LV2_ATOM__Path) == 0)
            return CARLA_URI_MAP_ID_ATOM_PATH;
        if (std::strcmp(uri, LV2_ATOM__Property) == 0)
            return CARLA_URI_MAP_ID_ATOM_PROPERTY;
        if (std::strcmp(uri, LV2_ATOM__Resource) == 0)
            return CARLA_URI_MAP_ID_ATOM_RESOURCE;
        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__Tuple) == 0)
            return CARLA_URI_MAP_ID_ATOM_TUPLE;
        if (std::strcmp(uri, LV2_ATOM__URI) == 0)
            return CARLA_URI_MAP_ID_ATOM_URI;
        if (std::strcmp(uri, LV2_ATOM__URID) == 0)
            return CARLA_URI_MAP_ID_ATOM_URID;
        if (std::strcmp(uri, LV2_ATOM__Vector) == 0)
            return CARLA_URI_MAP_ID_ATOM_VECTOR;
        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;

        // Time types
        if (std::strcmp(uri, LV2_TIME__Position) == 0)
            return CARLA_URI_MAP_ID_TIME_POSITION;
        if (std::strcmp(uri, LV2_TIME__bar) == 0)
            return CARLA_URI_MAP_ID_TIME_BAR;
        if (std::strcmp(uri, LV2_TIME__barBeat) == 0)
            return CARLA_URI_MAP_ID_TIME_BAR_BEAT;
        if (std::strcmp(uri, LV2_TIME__beat) == 0)
            return CARLA_URI_MAP_ID_TIME_BEAT;
        if (std::strcmp(uri, LV2_TIME__beatUnit) == 0)
            return CARLA_URI_MAP_ID_TIME_BEAT_UNIT;
        if (std::strcmp(uri, LV2_TIME__beatsPerBar) == 0)
            return CARLA_URI_MAP_ID_TIME_BEATS_PER_BAR;
        if (std::strcmp(uri, LV2_TIME__beatsPerMinute) == 0)
            return CARLA_URI_MAP_ID_TIME_BEATS_PER_MINUTE;
        if (std::strcmp(uri, LV2_TIME__frame) == 0)
            return CARLA_URI_MAP_ID_TIME_FRAME;
        if (std::strcmp(uri, LV2_TIME__framesPerSecond) == 0)
            return CARLA_URI_MAP_ID_TIME_FRAMES_PER_SECOND;
        if (std::strcmp(uri, LV2_TIME__speed) == 0)
            return CARLA_URI_MAP_ID_TIME_SPEED;

        // 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;

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

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

        // Atom types
        if (urid == CARLA_URI_MAP_ID_ATOM_BLANK)
            return LV2_ATOM__Blank;
        if (urid == CARLA_URI_MAP_ID_ATOM_BOOL)
            return LV2_ATOM__Bool;
        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_FLOAT)
            return LV2_ATOM__Float;
        if (urid == CARLA_URI_MAP_ID_ATOM_INT)
            return LV2_ATOM__Int;
        if (urid == CARLA_URI_MAP_ID_ATOM_LITERAL)
            return LV2_ATOM__Literal;
        if (urid == CARLA_URI_MAP_ID_ATOM_LONG)
            return LV2_ATOM__Long;
        if (urid == CARLA_URI_MAP_ID_ATOM_PATH)
            return LV2_ATOM__Path;
        if (urid == CARLA_URI_MAP_ID_ATOM_PROPERTY)
            return LV2_ATOM__Property;
        if (urid == CARLA_URI_MAP_ID_ATOM_RESOURCE)
            return LV2_ATOM__Resource;
        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_TUPLE)
            return LV2_ATOM__Tuple;
        if (urid == CARLA_URI_MAP_ID_ATOM_URI)
            return LV2_ATOM__URI;
        if (urid == CARLA_URI_MAP_ID_ATOM_URID)
            return LV2_ATOM__URID;
        if (urid == CARLA_URI_MAP_ID_ATOM_VECTOR)
            return LV2_ATOM__Vector;
        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;

        // Time types
        if (urid == CARLA_URI_MAP_ID_TIME_POSITION)
            return LV2_TIME__Position;
        if (urid == CARLA_URI_MAP_ID_TIME_BAR)
            return LV2_TIME__bar;
        if (urid == CARLA_URI_MAP_ID_TIME_BAR_BEAT)
            return LV2_TIME__barBeat;
        if (urid == CARLA_URI_MAP_ID_TIME_BEAT)
            return LV2_TIME__beat;
        if (urid == CARLA_URI_MAP_ID_TIME_BEAT_UNIT)
            return LV2_TIME__beatUnit;
        if (urid == CARLA_URI_MAP_ID_TIME_BEATS_PER_BAR)
            return LV2_TIME__beatsPerBar;
        if (urid == CARLA_URI_MAP_ID_TIME_BEATS_PER_MINUTE)
            return LV2_TIME__beatsPerMinute;
        if (urid == CARLA_URI_MAP_ID_TIME_FRAME)
            return LV2_TIME__frame;
        if (urid == CARLA_URI_MAP_ID_TIME_FRAMES_PER_SECOND)
            return LV2_TIME__framesPerSecond;
        if (urid == CARLA_URI_MAP_ID_TIME_SPEED)
            return LV2_TIME__speed;

        // 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;

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

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

    static LV2_Worker_Status carla_lv2_worker_schedule(LV2_Worker_Schedule_Handle handle, uint32_t size, const void* data)
    {
        CARLA_SAFE_ASSERT_RETURN(handle != nullptr, LV2_WORKER_ERR_UNKNOWN);
        carla_debug("carla_lv2_worker_schedule(%p, %i, %p)", handle, size, data);

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

    static LV2_Worker_Status carla_lv2_worker_respond(LV2_Worker_Respond_Handle handle, uint32_t size, const void* data)
    {
        CARLA_SAFE_ASSERT_RETURN(handle != nullptr, LV2_WORKER_ERR_UNKNOWN);
        carla_debug("carla_lv2_worker_respond(%p, %i, %p)", handle, size, data);

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

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

    CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(Lv2Plugin)
};

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

#define lv2PluginPtr ((Lv2Plugin*)plugin)

int CarlaEngineOsc::handleMsgLv2AtomTransfer(CARLA_ENGINE_OSC_HANDLE_ARGS2)
{
    CARLA_ENGINE_OSC_CHECK_OSC_TYPES(2, "is");
    carla_debug("CarlaOsc::handleMsgLv2AtomTransfer()");

    const int32_t portIndex   = argv[0]->i;
    const char* const atomBuf = (const char*)&argv[1]->s;

    CARLA_SAFE_ASSERT_RETURN(portIndex >= 0, 0);

    QByteArray chunk(QByteArray::fromBase64(atomBuf));

    CARLA_SAFE_ASSERT_RETURN(chunk.size() > 0, 0);

    const LV2_Atom* const atom((const LV2_Atom*)chunk.constData());
    lv2PluginPtr->handleTransferAtom(static_cast<uint32_t>(portIndex), atom);
    return 0;
}

int CarlaEngineOsc::handleMsgLv2UridMap(CARLA_ENGINE_OSC_HANDLE_ARGS2)
{
    CARLA_ENGINE_OSC_CHECK_OSC_TYPES(2, "is");
    carla_debug("CarlaOsc::handleMsgLv2EventTransfer()");

    const int32_t urid    = argv[0]->i;
    const char* const uri = (const char*)&argv[1]->s;

    CARLA_SAFE_ASSERT_RETURN(urid > 0, 0);

    lv2PluginPtr->handleUridMap(static_cast<LV2_URID>(urid), uri);
    return 0;
}

#undef lv2PluginPtr

CARLA_BACKEND_END_NAMESPACE

#endif // WANT_LV2

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

CARLA_BACKEND_START_NAMESPACE

CarlaPlugin* CarlaPlugin::newLV2(const Initializer& init)
{
    carla_debug("CarlaPlugin::newLV2({%p, \"%s\", \"%s\"})", init.engine, 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() == ENGINE_PROCESS_MODE_CONTINUOUS_RACK && ! plugin->canRunInRack())
    {
        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

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