Carla/source/backend/plugin/CarlaPluginJuce.cpp

/*
 * Carla Juce Plugin
 * Copyright (C) 2013-2021 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 USING_JUCE

#include "CarlaBackendUtils.hpp"
#include "CarlaMathUtils.hpp"
#include "CarlaProcessUtils.hpp"
#include "CarlaScopeUtils.hpp"
#include "CarlaVst2Utils.hpp"
#include "CarlaVst3Utils.hpp"

#define JUCE_GUI_BASICS_INCLUDE_XHEADERS 1

#include "carla_juce/carla_juce.h"

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdouble-promotion"
#pragma GCC diagnostic ignored "-Wduplicated-branches"
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wfloat-equal"
#include "juce_audio_processors/juce_audio_processors.h"
#include "juce_gui_basics/juce_gui_basics.h"
#pragma GCC diagnostic pop

#include "JucePluginWindow.hpp"

CARLA_BACKEND_START_NAMESPACE

// -------------------------------------------------------------------------------------------------------------------
// Fallback data

static const ExternalMidiNote kExternalMidiNoteFallback = { -1, 0, 0 };

// -------------------------------------------------------------------------------------------------------------------
// find all available plugin audio ports

static void findMaxTotalChannels(juce::AudioProcessor* const filter,
                                 const bool isAU, uint32_t& maxTotalIns, uint32_t& maxTotalOuts)
{
    filter->enableAllBuses();

    if (isAU)
    {
        maxTotalIns  = static_cast<uint32_t>(juce::jmax(0, filter->getTotalNumInputChannels()));
        maxTotalOuts = static_cast<uint32_t>(juce::jmax(0, filter->getTotalNumOutputChannels()));
        return;
    }

    const int numInputBuses  = filter->getBusCount(true);
    const int numOutputBuses = filter->getBusCount(false);

    if (numInputBuses > 1 || numOutputBuses > 1)
    {
        maxTotalIns = maxTotalOuts = 0;

        for (int i = 0; i < numInputBuses; ++i)
            maxTotalIns += static_cast<uint32_t>(juce::jmax(0, filter->getChannelCountOfBus(true, i)));

        for (int i = 0; i < numOutputBuses; ++i)
            maxTotalOuts += static_cast<uint32_t>(juce::jmax(0, filter->getChannelCountOfBus(false, i)));
    }
    else
    {
        maxTotalIns  = numInputBuses  > 0
                     ? static_cast<uint32_t>(juce::jmax(0, filter->getBus(true, 0)->getMaxSupportedChannels(64)))
                     : 0;

        maxTotalOuts = numOutputBuses > 0
                     ? static_cast<uint32_t>(juce::jmax(0, filter->getBus(false, 0)->getMaxSupportedChannels(64)))
                     : 0;
    }
}

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

class CarlaPluginJuce : public CarlaPlugin,
                        private juce::AudioPlayHead,
                        private juce::AudioProcessorListener
{
public:
    CarlaPluginJuce(CarlaEngine* const engine, const uint id)
        : CarlaPlugin(engine, id),
          fDesc(),
          fFormatManager(),
          fInstance(),
          fAudioBuffer(),
          fMidiBuffer(),
          fPosInfo(),
          fChunk(),
          fFormatName(),
          fWindow(),
          fNeedsUpdate(false)
    {
        carla_debug("CarlaPluginJuce::CarlaPluginJuce(%p, %i)", engine, id);

        fMidiBuffer.ensureSize(2048);
        fMidiBuffer.clear();
        fPosInfo.resetToDefault();
    }

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

        // close UI
        if (pData->hints & PLUGIN_HAS_CUSTOM_UI)
            showCustomUI(false);

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

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

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

        fInstance = nullptr;
        clearBuffers();
    }

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

    PluginType getType() const noexcept override
    {
        return getPluginTypeFromString(fDesc.pluginFormatName.toRawUTF8());
    }

    PluginCategory getCategory() const noexcept override
    {
        if (fDesc.isInstrument)
            return PLUGIN_CATEGORY_SYNTH;

        return getPluginCategoryFromName(fDesc.category.isNotEmpty()
                                         ? fDesc.category.toRawUTF8()
                                         : fDesc.name.toRawUTF8());
    }

    int64_t getUniqueId() const noexcept override
    {
        return fDesc.uniqueId;
    }

    uint32_t getLatencyInFrames() const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr, 0);

        const int latency = fInstance->getLatencySamples();
        CARLA_SAFE_ASSERT_RETURN(latency >= 0, 0);

        return static_cast<uint32_t>(latency);
    }

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

    // nothing

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

    std::size_t getChunkData(void** const dataPtr) noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(pData->options & PLUGIN_OPTION_USE_CHUNKS, 0);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr, 0);
        CARLA_SAFE_ASSERT_RETURN(dataPtr != nullptr, 0);

        *dataPtr = nullptr;

        try {
            fChunk.reset();
            fInstance->getStateInformation(fChunk);
        } CARLA_SAFE_EXCEPTION_RETURN("CarlaPluginJuce::getChunkData", 0);

        if (const std::size_t size = fChunk.getSize())
        {
            *dataPtr = fChunk.getData();
            return size;
        }

        return 0;
    }

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

    uint getOptionsAvailable() const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr, 0x0);

        uint options = 0x0;

        options |= PLUGIN_OPTION_USE_CHUNKS;

        if (fInstance->getNumPrograms() > 1)
            options |= PLUGIN_OPTION_MAP_PROGRAM_CHANGES;

        if (fInstance->acceptsMidi())
        {
            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;
            options |= PLUGIN_OPTION_SEND_PROGRAM_CHANGES;
            options |= PLUGIN_OPTION_SKIP_SENDING_NOTES;
        }

        return options;
    }

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

        juce::AudioProcessorParameter* const parameter = fInstance->getParameters()[static_cast<int>(parameterId)];
        CARLA_SAFE_ASSERT_RETURN(parameter != nullptr, 0.0f);

        return parameter->getValue();
    }

    bool getLabel(char* const strBuf) const noexcept override
    {
        if (fDesc.pluginFormatName == "AU" || fDesc.pluginFormatName == "AudioUnit")
            std::strncpy(strBuf, fDesc.fileOrIdentifier.toRawUTF8(), STR_MAX);
        else
            std::strncpy(strBuf, fDesc.name.toRawUTF8(), STR_MAX);

        return true;
    }

    bool getMaker(char* const strBuf) const noexcept override
    {
        std::strncpy(strBuf, fDesc.manufacturerName.toRawUTF8(), STR_MAX);
        return true;
    }

    bool getCopyright(char* const strBuf) const noexcept override
    {
        return getMaker(strBuf);
    }

    bool getRealName(char* const strBuf) const noexcept override
    {
        std::strncpy(strBuf, fDesc.descriptiveName.toRawUTF8(), STR_MAX);
        return true;
    }

    bool getParameterName(const uint32_t parameterId, char* const strBuf) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count, false);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr, false);

        juce::AudioProcessorParameter* const parameter = fInstance->getParameters()[static_cast<int>(parameterId)];
        CARLA_SAFE_ASSERT_RETURN(parameter != nullptr, false);

        std::strncpy(strBuf, parameter->getName(STR_MAX).toRawUTF8(), STR_MAX);
        return true;
    }

    bool getParameterText(const uint32_t parameterId, char* const strBuf) noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count, false);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr, false);

        juce::AudioProcessorParameter* const parameter = fInstance->getParameters()[static_cast<int>(parameterId)];
        CARLA_SAFE_ASSERT_RETURN(parameter != nullptr, false);

        std::strncpy(strBuf, parameter->getCurrentValueAsText().toRawUTF8(), STR_MAX);
        return true;
    }

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

        juce::AudioProcessorParameter* const parameter = fInstance->getParameters()[static_cast<int>(parameterId)];
        CARLA_SAFE_ASSERT_RETURN(parameter != nullptr, false);

        std::strncpy(strBuf, parameter->getLabel().toRawUTF8(), STR_MAX);
        return true;
    }

    bool getParameterGroupName(const uint32_t parameterId, char* const strBuf) const noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count, false);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr, false);

        if (fDesc.pluginFormatName != "VST" && fDesc.pluginFormatName != "VST2")
            return false;

        AEffect* const effect = (AEffect*)fInstance->getPlatformSpecificData();

        if (effect == nullptr)
            return false;

        VstParameterProperties prop;
        carla_zeroStruct(prop);

        if (effect->dispatcher(effect, effGetParameterProperties, static_cast<int32_t>(parameterId), 0, &prop, 0.0f) == 1
            && prop.category != 0 && prop.categoryLabel[0] != '\0')
        {
            std::snprintf(strBuf, STR_MAX, "%d:%s", prop.category, prop.categoryLabel);
            return true;
        }

        return false;
    }

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

    // nothing

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

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

        if (fWindow == nullptr || pData->uiTitle.isNotEmpty())
            return;

        juce::String uiName(pData->name);
        uiName += " (GUI)";
        fWindow->setName(uiName);
    }

    // -------------------------------------------------------------------
    // 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(parameterId < pData->param.count,);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);

        juce::AudioProcessorParameter* const parameter = fInstance->getParameters()[static_cast<int>(parameterId)];
        CARLA_SAFE_ASSERT_RETURN(parameter != nullptr,);

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

        try {
            parameter->setValue(value);
        } CARLA_SAFE_EXCEPTION("setValue");

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

    void setParameterValueRT(const uint32_t parameterId, const float value, const uint32_t frameOffset, const bool sendCallbackLater) noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(parameterId < pData->param.count,);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);

        juce::AudioProcessorParameter* const parameter = fInstance->getParameters()[static_cast<int>(parameterId)];
        CARLA_SAFE_ASSERT_RETURN(parameter != nullptr,);

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

        try {
            parameter->setValue(value);
        } CARLA_SAFE_EXCEPTION("setValue(RT)");

        CarlaPlugin::setParameterValueRT(parameterId, fixedValue, frameOffset, sendCallbackLater);
    }

    void setChunkData(const void* const data, const std::size_t dataSize) override
    {
        CARLA_SAFE_ASSERT_RETURN(pData->options & PLUGIN_OPTION_USE_CHUNKS,);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(data != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(dataSize > 0,);

        if (isJuceSaveFormat(data, dataSize))
        {
            const ScopedSingleProcessLocker spl(this, true);
            fInstance->setStateInformation(data, static_cast<int>(dataSize));
        }
        else
        {
            uint8_t* const dataCompat = (uint8_t*)std::malloc(dataSize + 160);
            CARLA_SAFE_ASSERT_RETURN(dataCompat != nullptr,);

            carla_stdout("NOTE: Loading plugin state in Carla JUCE/VST2 compatibility mode");
            std::memset(dataCompat, 0, 160);
            std::memcpy(dataCompat+160, data, dataSize);

            int32_t* const set = (int32_t*)dataCompat;

            set[0]  = (int32_t)juce::ByteOrder::littleEndianInt("CcnK");
            set[2]  = (int32_t)juce::ByteOrder::littleEndianInt("FBCh");
            set[3]  = fxbSwap(1);
            set[39] = fxbSwap(static_cast<int32_t>(dataSize));

            {
                const ScopedSingleProcessLocker spl(this, true);
                fInstance->setStateInformation(dataCompat, static_cast<int>(dataSize+160));
            }

            std::free(dataCompat);
        }

        pData->updateParameterValues(this, true, true, false);
    }

    void setProgram(const int32_t index, const bool sendGui, const bool sendOsc, const bool sendCallback, const bool doingInit) noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(index >= -1 && index < static_cast<int32_t>(pData->prog.count),);

        if (index >= 0)
        {
            const ScopedSingleProcessLocker spl(this, (sendGui || sendOsc || sendCallback));

            try {
                fInstance->setCurrentProgram(index);
            } CARLA_SAFE_EXCEPTION("setCurrentProgram");
        }

        CarlaPlugin::setProgram(index, sendGui, sendOsc, sendCallback, doingInit);
    }

    void setProgramRT(const uint32_t index, const bool sendCallbackLater) noexcept override
    {
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(index < pData->prog.count,);

        try {
            fInstance->setCurrentProgram(static_cast<int32_t>(index));
        } CARLA_SAFE_EXCEPTION("setCurrentProgram");

        CarlaPlugin::setProgramRT(index, sendCallbackLater);
    }

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

    void setCustomUITitle(const char* const title) noexcept override
    {
        if (fWindow != nullptr)
        {
            try {
                fWindow->setName(title);
            } CARLA_SAFE_EXCEPTION("set custom ui title");
        }

        CarlaPlugin::setCustomUITitle(title);
    }

    void showCustomUI(const bool yesNo) override
    {
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);
        carla_debug("CarlaPluginJuce::showCustomUI(%s)", bool2str(yesNo));

        if (yesNo)
        {
            if (juce::AudioProcessorEditor* const editor = fInstance->createEditorIfNeeded())
            {
                const EngineOptions& opts(pData->engine->getOptions());
#ifndef CARLA_OS_MAC
                editor->setScaleFactor(opts.uiScale);
#endif

                if (fWindow == nullptr)
                {
                    juce::String uiName;

                    if (pData->uiTitle.isNotEmpty())
                    {
                        uiName = pData->uiTitle.buffer();
                    }
                    else
                    {
                        uiName  = pData->name;
                        uiName += " (GUI)";
                    }

                    AEffect* const vst2effect = fDesc.pluginFormatName == "VST" || fDesc.pluginFormatName == "VST2"
                                              ? (AEffect*)fInstance->getPlatformSpecificData()
                                              : nullptr;

                    /* TODO update to juce7 APIs
                    v3_plugin_view** const vst3view = fDesc.pluginFormatName == "VST3"
                                                    ? (v3_plugin_view**)editor->getPlatformSpecificData()
                                                    : nullptr;
                    */
                    v3_plugin_view** const vst3view = nullptr;

                    fWindow = new JucePluginWindow(opts.frontendWinId, opts.pluginsAreStandalone,
                                                   vst2effect, vst3view);
                    fWindow->setName(uiName);
                }

                fWindow->show(editor);
                fWindow->toFront(true);
            }
        }
        else
        {
            if (juce::AudioProcessorEditor* const editor = fInstance->getActiveEditor())
                delete editor;

            fWindow = nullptr;
        }
    }

    void uiIdle() override
    {
        if (fWindow != nullptr)
        {
            if (fWindow->wasClosedByUser())
            {
                showCustomUI(false);
                pData->engine->callback(true, true,
                                        ENGINE_CALLBACK_UI_STATE_CHANGED,
                                        pData->id,
                                        0,
                                        0, 0, 0.0f, nullptr);
            }
        }

        CarlaPlugin::uiIdle();
    }

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

    void reload() override
    {
        CARLA_SAFE_ASSERT_RETURN(pData->engine != nullptr,);
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);
        carla_debug("CarlaPluginJuce::reload() - start");

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

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

        if (pData->active)
            deactivate();

        clearBuffers();

        uint32_t aIns, aOuts, mIns, mOuts, params;
        mIns = mOuts = 0;

        bool needsCtrlIn, needsCtrlOut;
        needsCtrlIn = needsCtrlOut = false;

        const bool isAU = fDesc.pluginFormatName == "AU" || fDesc.pluginFormatName == "AudioUnit";
        const bool isVST2 = fDesc.pluginFormatName == "VST" || fDesc.pluginFormatName == "VST2";
        const bool isVST3 = fDesc.pluginFormatName == "VST3";
        findMaxTotalChannels(fInstance.get(), isAU, aIns, aOuts);
        fInstance->refreshParameterList();

        const juce::Array<juce::AudioProcessorParameter*>& parameters(fInstance->getParameters());
        params = static_cast<uint32_t>(std::max(parameters.size(), 0));

        if (fInstance->acceptsMidi())
        {
            mIns = 1;
            needsCtrlIn = true;
        }

        if (fInstance->producesMidi())
        {
            mOuts = 1;
            needsCtrlOut = true;
        }

        if (aIns > 0)
        {
            pData->audioIn.createNew(aIns);
        }

        if (aOuts > 0)
        {
            pData->audioOut.createNew(aOuts);
            needsCtrlIn = true;
        }

        if (params > 0)
        {
            pData->param.createNew(params, false);
            needsCtrlIn = true;
        }

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

        // Audio Ins
        for (uint32_t j=0; j < aIns; ++j)
        {
            portName.clear();

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

            if (aIns > 1)
            {
                portName += "input_";
                portName += CarlaString(j+1);
            }
            else
                portName += "input";

            portName.truncate(portNameSize);

            pData->audioIn.ports[j].port   = (CarlaEngineAudioPort*)pData->client->addPort(kEnginePortTypeAudio, portName, true, j);
            pData->audioIn.ports[j].rindex = j;
        }

        // Audio Outs
        for (uint32_t j=0; j < aOuts; ++j)
        {
            portName.clear();

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

            if (aOuts > 1)
            {
                portName += "output_";
                portName += CarlaString(j+1);
            }
            else
                portName += "output";

            portName.truncate(portNameSize);

            pData->audioOut.ports[j].port   = (CarlaEngineAudioPort*)pData->client->addPort(kEnginePortTypeAudio, portName, false, j);
            pData->audioOut.ports[j].rindex = j;
        }

        for (uint32_t j=0; j < params; ++j)
        {
            const int32_t ij = static_cast<int>(j);
            juce::AudioProcessorParameter* const parameter = parameters[ij];
            CARLA_SAFE_ASSERT_CONTINUE(parameter != nullptr);

            pData->param.data[j].type   = PARAMETER_INPUT;
            pData->param.data[j].index  = static_cast<int32_t>(j);
            pData->param.data[j].rindex = static_cast<int32_t>(j);

            pData->param.data[j].hints |= PARAMETER_IS_ENABLED;
            pData->param.data[j].hints |= PARAMETER_USES_CUSTOM_TEXT;

            if (parameter->isAutomatable())
                pData->param.data[j].hints |= PARAMETER_IS_AUTOMATABLE;

            const float min = 0.0f;
            const float max = 1.0f;
            float def, step, stepSmall, stepLarge;
            bool hasDetails = false;

            if (isVST2)
            {
                AEffect* const effect = (AEffect*)fInstance->getPlatformSpecificData();

                VstParameterProperties prop;
                carla_zeroStruct(prop);

                if (effect != nullptr && effect->dispatcher(effect, effGetParameterProperties, ij, 0, &prop, 0.0f) == 1)
                {
                    hasDetails = true;

                    /**/ if (prop.flags & kVstParameterIsSwitch)
                    {
                        step = max - min;
                        stepSmall = step;
                        stepLarge = step;
                        pData->param.data[j].hints |= PARAMETER_IS_BOOLEAN;
                    }
                    else if (prop.flags & kVstParameterUsesIntStep)
                    {
                        step = static_cast<float>(prop.stepInteger);
                        stepSmall = static_cast<float>(prop.stepInteger)/10.0f;
                        stepLarge = static_cast<float>(prop.largeStepInteger);
                    }
                    else if (prop.flags & kVstParameterUsesFloatStep)
                    {
                        step = prop.stepFloat;
                        stepSmall = prop.smallStepFloat;
                        stepLarge = prop.largeStepFloat;
                    }
                    else
                    {
                        const float range = max - min;
                        step = range/100.0f;
                        stepSmall = range/1000.0f;
                        stepLarge = range/10.0f;
                    }

                    if ((prop.flags & (kVstParameterIsSwitch|kVstParameterUsesIntStep)) == 0x0)
                        pData->param.data[j].hints |= PARAMETER_CAN_BE_CV_CONTROLLED;
                    if (prop.flags & kVstParameterCanRamp)
                        pData->param.data[j].hints |= PARAMETER_IS_LOGARITHMIC;
                }
            }
            else if (isVST3)
            {
                v3_component** const component = (v3_component**)fInstance->getPlatformSpecificData();

                v3_edit_controller** controller = nullptr;
                v3_cpp_obj_query_interface(component, v3_edit_controller_iid, &controller);

                if (controller != nullptr)
                {
                    v3_param_info info;
                    if (v3_cpp_obj(controller)->get_parameter_info(controller, static_cast<int32_t>(j), &info) == V3_OK)
                    {
                        hasDetails = true;

                        if (info.step_count == 1)
                        {
                            step = stepSmall = stepLarge = 1;
                            pData->param.data[j].hints |= PARAMETER_IS_BOOLEAN;
                        }
                        else if (info.step_count != 0)
                        {
                            step = 1.0f / static_cast<float>(info.step_count);
                            stepSmall = step/10.0f;
                            stepLarge = std::min(1.0f, step*10.0f);
                        }
                        else
                        {
                            const float range = max - min;
                            step = range/100.0f;
                            stepSmall = range/1000.0f;
                            stepLarge = range/10.0f;
                        }

                        if (info.flags & V3_PARAM_READ_ONLY)
                            pData->param.data[j].type = PARAMETER_OUTPUT;
                        // TODO V3_PARAM_IS_LIST
                        if (info.flags & (V3_PARAM_IS_HIDDEN|V3_PARAM_PROGRAM_CHANGE))
                            pData->param.data[j].hints &= ~PARAMETER_IS_ENABLED;

                        if ((info.flags & (V3_PARAM_IS_LIST|V3_PARAM_IS_HIDDEN|V3_PARAM_PROGRAM_CHANGE)) == 0x0)
                            if (info.flags & V3_PARAM_CAN_AUTOMATE)
                                pData->param.data[j].hints |= PARAMETER_CAN_BE_CV_CONTROLLED;
                    }

                    v3_cpp_obj_unref(controller);
                }
            }

            if (! hasDetails)
            {
                if (parameter->isBoolean())
                {
                    step = max - min;
                    stepSmall = step;
                    stepLarge = step;
                    pData->param.data[j].hints |= PARAMETER_IS_BOOLEAN;
                }
                else
                {
                    const float range = max - min;
                    step = range/100.0f;
                    stepSmall = range/1000.0f;
                    stepLarge = range/10.0f;

                    if (! parameter->isMetaParameter())
                        pData->param.data[j].hints |= PARAMETER_CAN_BE_CV_CONTROLLED;
                }
            }

            def = parameter->getDefaultValue();

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

            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;
        }

        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, 0);
#ifndef BUILD_BRIDGE_ALTERNATIVE_ARCH
            pData->event.cvSourcePorts = pData->client->createCVSourcePorts();
#endif
        }

        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, 0);
        }

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

        if (fDesc.isInstrument)
            pData->hints |= PLUGIN_IS_SYNTH;

        if (fInstance->hasEditor())
        {
            pData->hints |= PLUGIN_HAS_CUSTOM_UI;
            pData->hints |= PLUGIN_NEEDS_UI_MAIN_THREAD;
        }

        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 (mIns > 0)
            pData->extraHints |= PLUGIN_EXTRA_HINT_HAS_MIDI_IN;

        if (mOuts > 0)
            pData->extraHints |= PLUGIN_EXTRA_HINT_HAS_MIDI_OUT;

        fInstance->setRateAndBufferSizeDetails(pData->engine->getSampleRate(),
                                               static_cast<int>(pData->engine->getBufferSize()));

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

        if (pData->active)
            activate();

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

    void reloadPrograms(const bool doInit) override
    {
        carla_debug("CarlaPluginJuce::reloadPrograms(%s)", bool2str(doInit));
        const uint32_t oldCount = pData->prog.count;
        const int32_t  current  = pData->prog.current;

        // Delete old programs
        pData->prog.clear();

        // Query new programs
        const uint32_t newCount = (fInstance->getNumPrograms() > 0)
                                ? static_cast<uint32_t>(fInstance->getNumPrograms())
                                : 0;

        if (newCount > 0)
        {
            pData->prog.createNew(newCount);

            // Update names
            for (uint32_t i=0; i < newCount; ++i)
                pData->prog.names[i] = carla_strdup(fInstance->getProgramName(static_cast<int>(i)).toRawUTF8());
        }

        if (doInit)
        {
            if (newCount > 0)
                setProgram(0, false, false, false, true);
        }
        else
        {
            // Check if current program is invalid
            bool programChanged = false;

            if (newCount == oldCount+1)
            {
                // one program added, probably created by user
                pData->prog.current = static_cast<int32_t>(oldCount);
                programChanged = true;
            }
            else if (current < 0 && newCount > 0)
            {
                // programs exist now, but not before
                pData->prog.current = 0;
                programChanged = true;
            }
            else if (current >= 0 && newCount == 0)
            {
                // programs existed before, but not anymore
                pData->prog.current = -1;
                programChanged = true;
            }
            else if (current >= static_cast<int32_t>(newCount))
            {
                // current program > count
                pData->prog.current = 0;
                programChanged = true;
            }
            else
            {
                // no change
                pData->prog.current = current;
            }

            if (programChanged)
            {
                setProgram(pData->prog.current, true, true, true, false);
            }
            else
            {
                // Program was changed during update, re-set it
                if (pData->prog.current >= 0)
                    fInstance->setCurrentProgram(pData->prog.current);
            }

            pData->engine->callback(true, true, ENGINE_CALLBACK_RELOAD_PROGRAMS, pData->id, 0, 0, 0, 0.0f, nullptr);
        }
    }

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

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

        try {
            fInstance->prepareToPlay(pData->engine->getSampleRate(), static_cast<int>(pData->engine->getBufferSize()));
        } catch(...) {}
    }

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

        try {
            fInstance->releaseResources();
        } catch(...) {}
    }

    void process(const float* const* const audioIn,
                 float** const audioOut,
                 const float* const* const cvIn,
                 float**,
                 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)
                carla_zeroFloats(audioOut[i], frames);
            return;
        }

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

        if (pData->needsReset)
        {
            fInstance->reset();
            pData->needsReset = false;
        }

        // --------------------------------------------------------------------------------------------------------
        // Event Input

        fMidiBuffer.clear();

        if (pData->event.portIn != nullptr)
        {
            // ----------------------------------------------------------------------------------------------------
            // MIDI Input (External)

            if (pData->extNotes.mutex.tryLock())
            {
                for (RtLinkedList<ExternalMidiNote>::Itenerator it = pData->extNotes.data.begin2(); it.valid(); it.next())
                {
                    const ExternalMidiNote& note(it.getValue(kExternalMidiNoteFallback));
                    CARLA_SAFE_ASSERT_CONTINUE(note.channel >= 0 && note.channel < MAX_MIDI_CHANNELS);

                    uint8_t midiEvent[3];
                    midiEvent[0] = uint8_t((note.velo > 0 ? MIDI_STATUS_NOTE_ON : MIDI_STATUS_NOTE_OFF) | (note.channel & MIDI_CHANNEL_BIT));
                    midiEvent[1] = note.note;
                    midiEvent[2] = note.velo;

                    fMidiBuffer.addEvent(midiEvent, 3, 0);
                }

                pData->extNotes.data.clear();
                pData->extNotes.mutex.unlock();

            } // End of MIDI Input (External)

            // ----------------------------------------------------------------------------------------------------
            // Event Input (System)

#ifndef BUILD_BRIDGE_ALTERNATIVE_ARCH
            bool allNotesOffSent = false;

            if (cvIn != nullptr && pData->event.cvSourcePorts != nullptr)
                pData->event.cvSourcePorts->initPortBuffers(cvIn, frames, false, pData->event.portIn);
#endif

            for (uint32_t i=0, numEvents=pData->event.portIn->getEventCount(); i < numEvents; ++i)
            {
                EngineEvent& event(pData->event.portIn->getEvent(i));

                if (event.time >= frames)
                    continue;

                switch (event.type)
                {
                case kEngineEventTypeNull:
                    break;

                case kEngineEventTypeControl: {
                    EngineControlEvent& ctrlEvent(event.ctrl);

                    switch (ctrlEvent.type)
                    {
                    case kEngineControlEventTypeNull:
                        break;

                    case kEngineControlEventTypeParameter: {
                        float value;

#ifndef BUILD_BRIDGE_ALTERNATIVE_ARCH
                        // non-midi
                        if (event.channel == kEngineEventNonMidiChannel)
                        {
                            const uint32_t k = ctrlEvent.param;
                            CARLA_SAFE_ASSERT_CONTINUE(k < pData->param.count);

                            ctrlEvent.handled = true;
                            value = pData->param.getFinalUnnormalizedValue(k, ctrlEvent.normalizedValue);
                            setParameterValueRT(k, value, event.time, true);
                            continue;
                        }

                        // Control backend stuff
                        if (event.channel == pData->ctrlChannel)
                        {
                            if (MIDI_IS_CONTROL_BREATH_CONTROLLER(ctrlEvent.param) && (pData->hints & PLUGIN_CAN_DRYWET) != 0)
                            {
                                ctrlEvent.handled = true;
                                value = ctrlEvent.normalizedValue;
                                setDryWetRT(value, true);
                            }
                            else if (MIDI_IS_CONTROL_CHANNEL_VOLUME(ctrlEvent.param) && (pData->hints & PLUGIN_CAN_VOLUME) != 0)
                            {
                                ctrlEvent.handled = true;
                                value = ctrlEvent.normalizedValue*127.0f/100.0f;
                                setVolumeRT(value, true);
                            }
                            else if (MIDI_IS_CONTROL_BALANCE(ctrlEvent.param) && (pData->hints & PLUGIN_CAN_BALANCE) != 0)
                            {
                                float left, right;
                                value = ctrlEvent.normalizedValue/0.5f - 1.0f;

                                if (value < 0.0f)
                                {
                                    left  = -1.0f;
                                    right = (value*2.0f)+1.0f;
                                }
                                else if (value > 0.0f)
                                {
                                    left  = (value*2.0f)-1.0f;
                                    right = 1.0f;
                                }
                                else
                                {
                                    left  = -1.0f;
                                    right = 1.0f;
                                }

                                ctrlEvent.handled = true;
                                setBalanceLeftRT(left, true);
                                setBalanceRightRT(right, true);
                            }
                        }
#endif
                        // Control plugin parameters
                        uint32_t k;
                        for (k=0; k < pData->param.count; ++k)
                        {
                            if (pData->param.data[k].midiChannel != event.channel)
                                continue;
                            if (pData->param.data[k].mappedControlIndex != ctrlEvent.param)
                                continue;
                            if (pData->param.data[k].type != PARAMETER_INPUT)
                                continue;
                            if ((pData->param.data[k].hints & PARAMETER_IS_AUTOMATABLE) == 0)
                                continue;

                            ctrlEvent.handled = true;
                            value = pData->param.getFinalUnnormalizedValue(k, ctrlEvent.normalizedValue);
                            setParameterValueRT(k, value, event.time, true);
                        }

                        if ((pData->options & PLUGIN_OPTION_SEND_CONTROL_CHANGES) != 0 && ctrlEvent.param < MAX_MIDI_VALUE)
                        {
                            uint8_t midiData[3];
                            midiData[0] = uint8_t(MIDI_STATUS_CONTROL_CHANGE | (event.channel & MIDI_CHANNEL_BIT));
                            midiData[1] = uint8_t(ctrlEvent.param);
                            midiData[2] = uint8_t(ctrlEvent.normalizedValue*127.0f + 0.5f);

                            fMidiBuffer.addEvent(midiData, 3, static_cast<int>(event.time));
                        }

#ifndef BUILD_BRIDGE_ALTERNATIVE_ARCH
                        if (! ctrlEvent.handled)
                            checkForMidiLearn(event);
#endif
                        break;
                    } // case kEngineControlEventTypeParameter

                    case kEngineControlEventTypeMidiBank:
                        if ((pData->options & PLUGIN_OPTION_SEND_PROGRAM_CHANGES) != 0)
                        {
                            uint8_t midiData[3];
                            midiData[0] = uint8_t(MIDI_STATUS_CONTROL_CHANGE | (event.channel & MIDI_CHANNEL_BIT));
                            midiData[1] = MIDI_CONTROL_BANK_SELECT;
                            midiData[2] = 0;
                            fMidiBuffer.addEvent(midiData, 3, static_cast<int>(event.time));

                            midiData[1] = MIDI_CONTROL_BANK_SELECT__LSB;
                            midiData[2] = uint8_t(ctrlEvent.normalizedValue*127.0f + 0.5f);
                            fMidiBuffer.addEvent(midiData, 3, static_cast<int>(event.time));
                        }
                        break;

                    case kEngineControlEventTypeMidiProgram:
                        if (event.channel == pData->ctrlChannel && (pData->options & PLUGIN_OPTION_MAP_PROGRAM_CHANGES) != 0)
                        {
                            if (ctrlEvent.param < pData->prog.count)
                            {
                                setProgramRT(ctrlEvent.param, true);
                            }
                        }
                        else if ((pData->options & PLUGIN_OPTION_SEND_PROGRAM_CHANGES) != 0)
                        {
                            uint8_t midiData[2];
                            midiData[0] = uint8_t(MIDI_STATUS_PROGRAM_CHANGE | (event.channel & MIDI_CHANNEL_BIT));
                            midiData[1] = uint8_t(ctrlEvent.normalizedValue*127.0f + 0.5f);
                            fMidiBuffer.addEvent(midiData, 2, static_cast<int>(event.time));
                        }
                        break;

                    case kEngineControlEventTypeAllSoundOff:
                        if (pData->options & PLUGIN_OPTION_SEND_ALL_SOUND_OFF)
                        {
                            uint8_t midiData[3];
                            midiData[0] = uint8_t(MIDI_STATUS_CONTROL_CHANGE | (event.channel & MIDI_CHANNEL_BIT));
                            midiData[1] = MIDI_CONTROL_ALL_SOUND_OFF;
                            midiData[2] = 0;

                            fMidiBuffer.addEvent(midiData, 3, static_cast<int>(event.time));
                        }
                        break;

                    case kEngineControlEventTypeAllNotesOff:
                        if (pData->options & PLUGIN_OPTION_SEND_ALL_SOUND_OFF)
                        {
#ifndef BUILD_BRIDGE_ALTERNATIVE_ARCH
                            if (event.channel == pData->ctrlChannel && ! allNotesOffSent)
                            {
                                allNotesOffSent = true;
                                postponeRtAllNotesOff();
                            }
#endif

                            uint8_t midiData[3];
                            midiData[0] = uint8_t(MIDI_STATUS_CONTROL_CHANGE | (event.channel & MIDI_CHANNEL_BIT));
                            midiData[1] = MIDI_CONTROL_ALL_NOTES_OFF;
                            midiData[2] = 0;

                            fMidiBuffer.addEvent(midiData, 3, static_cast<int>(event.time));
                        }
                        break;
                    } // switch (ctrlEvent.type)
                    break;
                } // case kEngineEventTypeControl

                case kEngineEventTypeMidi: {
                    const EngineMidiEvent& midiEvent(event.midi);

                    const uint8_t* const midiData(midiEvent.size > EngineMidiEvent::kDataSize ? midiEvent.dataExt : midiEvent.data);

                    uint8_t status = uint8_t(MIDI_GET_STATUS_FROM_DATA(midiData));

                    if ((status == MIDI_STATUS_NOTE_OFF || status == MIDI_STATUS_NOTE_ON) && (pData->options & PLUGIN_OPTION_SKIP_SENDING_NOTES))
                        continue;
                    if (status == MIDI_STATUS_CHANNEL_PRESSURE && (pData->options & PLUGIN_OPTION_SEND_CHANNEL_PRESSURE) == 0)
                        continue;
                    if (status == MIDI_STATUS_CONTROL_CHANGE && (pData->options & PLUGIN_OPTION_SEND_CONTROL_CHANGES) == 0)
                        continue;
                    if (status == MIDI_STATUS_POLYPHONIC_AFTERTOUCH && (pData->options & PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH) == 0)
                        continue;
                    if (status == MIDI_STATUS_PITCH_WHEEL_CONTROL && (pData->options & PLUGIN_OPTION_SEND_PITCHBEND) == 0)
                        continue;

                    // Fix bad note-off
                    if (status == MIDI_STATUS_NOTE_ON && midiData[2] == 0)
                        status = MIDI_STATUS_NOTE_OFF;

                    // put back channel in data
                    uint8_t midiData2[midiEvent.size];
                    midiData2[0] = uint8_t(status | (event.channel & MIDI_CHANNEL_BIT));
                    std::memcpy(midiData2+1, midiData+1, static_cast<std::size_t>(midiEvent.size-1));

                    fMidiBuffer.addEvent(midiData2, midiEvent.size, static_cast<int>(event.time));

                    if (status == MIDI_STATUS_NOTE_ON)
                    {
                        pData->postponeNoteOnRtEvent(true, event.channel, midiData[1], midiData[2]);
                    }
                    else if (status == MIDI_STATUS_NOTE_OFF)
                    {
                        pData->postponeNoteOffRtEvent(true, event.channel, midiData[1]);
                    }
                } break;
                } // switch (event.type)
            }

            pData->postRtEvents.trySplice();

        } // End of Event Input

        // --------------------------------------------------------------------------------------------------------
        // Set TimeInfo

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

        fPosInfo.isPlaying = timeInfo.playing;

        if (timeInfo.bbt.valid)
        {
            CARLA_SAFE_ASSERT_INT(timeInfo.bbt.bar > 0, timeInfo.bbt.bar);
            CARLA_SAFE_ASSERT_INT(timeInfo.bbt.beat > 0, timeInfo.bbt.beat);

            const double ppqBar  = static_cast<double>(timeInfo.bbt.beatsPerBar) * (timeInfo.bbt.bar - 1);
            const double ppqBeat = static_cast<double>(timeInfo.bbt.beat - 1);
            const double ppqTick = timeInfo.bbt.tick / timeInfo.bbt.ticksPerBeat;

            fPosInfo.bpm = timeInfo.bbt.beatsPerMinute;

            fPosInfo.timeSigNumerator   = static_cast<int>(timeInfo.bbt.beatsPerBar);
            fPosInfo.timeSigDenominator = static_cast<int>(timeInfo.bbt.beatType);

            fPosInfo.timeInSamples = static_cast<int64_t>(timeInfo.frame);
            fPosInfo.timeInSeconds = static_cast<double>(fPosInfo.timeInSamples)/pData->engine->getSampleRate();

            fPosInfo.ppqPosition = ppqBar + ppqBeat + ppqTick;
            fPosInfo.ppqPositionOfLastBarStart = ppqBar;
        }

        // --------------------------------------------------------------------------------------------------------
        // Process

        processSingle(audioIn, audioOut, frames);

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

#ifdef BUILD_BRIDGE_ALTERNATIVE_ARCH
        return;

        // unused
        (void)cvIn;
#endif
    }

    bool processSingle(const float* const* const inBuffer, float** const outBuffer, const uint32_t frames)
    {
        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)
                carla_zeroFloats(outBuffer[i], frames);
            return false;
        }

        // --------------------------------------------------------------------------------------------------------
        // Set audio in buffers

        for (uint32_t i=0; i < pData->audioIn.count; ++i)
            fAudioBuffer.copyFrom(static_cast<int>(i), 0, inBuffer[i], static_cast<int>(frames));

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

        fInstance->processBlock(fAudioBuffer, fMidiBuffer);

        // --------------------------------------------------------------------------------------------------------
        // Set audio out buffers

        for (uint32_t i=0; i < pData->audioOut.count; ++i)
            carla_copyFloats(outBuffer[i], fAudioBuffer.getReadPointer(static_cast<int>(i)), frames);

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

        {
            const bool doVolume  = (pData->hints & PLUGIN_CAN_VOLUME) != 0 && carla_isNotEqual(pData->postProc.volume, 1.0f);
            const bool doDryWet  = (pData->hints & PLUGIN_CAN_DRYWET) != 0 && carla_isNotEqual(pData->postProc.dryWet, 1.0f);
            const bool doBalance = (pData->hints & PLUGIN_CAN_BALANCE) != 0 && ! (carla_isEqual(pData->postProc.balanceLeft, -1.0f) && carla_isEqual(pData->postProc.balanceRight, 1.0f));
            const bool isMono    = (pData->audioIn.count == 1);

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

            for (uint32_t i=0; i < pData->audioOut.count; ++i)
            {
                // Dry/Wet
                if (doDryWet)
                {
                    const uint32_t c = isMono ? 0 : i;

                    for (uint32_t k=0; k < frames; ++k)
                    {
                        bufValue = inBuffer[c][k];
                        outBuffer[i][k] = (outBuffer[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);
                        carla_copyFloats(oldBufLeft, outBuffer[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
                            outBuffer[i][k]  = oldBufLeft[k]     * (1.0f - balRangeL);
                            outBuffer[i][k] += outBuffer[i+1][k] * (1.0f - balRangeR);
                        }
                        else
                        {
                            // right
                            outBuffer[i][k]  = outBuffer[i][k] * balRangeR;
                            outBuffer[i][k] += oldBufLeft[k]   * balRangeL;
                        }
                    }
                }

                // Volume
                if (doVolume)
                {
                    for (uint32_t k=0; k < frames; ++k)
                        outBuffer[i][k] *= pData->postProc.volume;
                }
            }

        } // End of Post-processing
#endif

        // --------------------------------------------------------------------------------------------------------
        // Midi out

        if (! fMidiBuffer.isEmpty())
        {
            if (pData->event.portOut != nullptr)
            {
                for (juce::MidiBufferIterator it = fMidiBuffer.cbegin(), end = fMidiBuffer.cend(); it != end; ++it)
                {
                    const juce::MidiMessageMetadata metadata(*it);
                    CARLA_SAFE_ASSERT_BREAK(metadata.samplePosition >= 0);
                    CARLA_SAFE_ASSERT_BREAK(metadata.samplePosition < static_cast<int>(frames));
                    CARLA_SAFE_ASSERT_BREAK(metadata.numBytes > 0);
                    CARLA_SAFE_ASSERT_CONTINUE(metadata.numBytes <= 0xff);

                    if (! pData->event.portOut->writeMidiEvent(static_cast<uint32_t>(metadata.samplePosition),
                                                               static_cast<uint8_t>(metadata.numBytes),
                                                               metadata.data))
                        break;
                }
            }

            fMidiBuffer.clear();
        }

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

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

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

        fAudioBuffer.setSize(static_cast<int>(std::max<uint32_t>(pData->audioIn.count, pData->audioOut.count)), static_cast<int>(newBufferSize));

        if (pData->active)
        {
            deactivate();
            activate();
        }
    }

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

        if (pData->active)
        {
            deactivate();
            activate();
        }
    }

    // -------------------------------------------------------------------
    // Misc

    void idle() override
    {
        if (fNeedsUpdate)
        {
            fNeedsUpdate = false;
            pData->engine->callback(true, true, ENGINE_CALLBACK_UPDATE, pData->id, 0, 0, 0, 0.0f, nullptr);
        }

        CarlaPlugin::idle();
    }

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

    // nothing

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

    // nothing

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

    void* getNativeHandle() const noexcept override
    {
        return (fInstance != nullptr) ? fInstance->getPlatformSpecificData() : nullptr;
    }

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

protected:
    void audioProcessorParameterChanged(juce::AudioProcessor*, int index, float value) override
    {
        CARLA_SAFE_ASSERT_RETURN(index >= 0,);

        const uint32_t uindex(static_cast<uint32_t>(index));
        const float fixedValue(pData->param.getFixedValue(uindex, value));

        CarlaPlugin::setParameterValue(static_cast<uint32_t>(index), fixedValue, false, true, true);
    }

    void audioProcessorChanged(juce::AudioProcessor*, const ChangeDetails& details) override
    {
        if (details.parameterInfoChanged || details.programChanged)
            fNeedsUpdate = true;
    }

    void audioProcessorParameterChangeGestureBegin(juce::AudioProcessor*, int index) override
    {
        CARLA_SAFE_ASSERT_RETURN(index >= 0,);

        pData->engine->touchPluginParameter(pData->id, static_cast<uint32_t>(index), true);
    }

    void audioProcessorParameterChangeGestureEnd(juce::AudioProcessor*, int index) override
    {
        CARLA_SAFE_ASSERT_RETURN(index >= 0,);

        pData->engine->touchPluginParameter(pData->id, static_cast<uint32_t>(index), false);
    }

    juce::Optional<juce::AudioPlayHead::PositionInfo> getPosition() const override
    {
        /* TODO update to juce7 APIs
        carla_copyStruct(result, fPosInfo);
        */
        return {};
    }

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

public:
    bool init(const CarlaPluginPtr plugin,
              const char* const filename, const char* const name, const char* const label,
              const int64_t uniqueId, const uint options, const char* const format)
    {
        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 (format == nullptr || format[0] == '\0')
        {
            pData->engine->setLastError("null format");
            return false;
        }

        // AU requires label
        if (std::strcmp(format, "AU") == 0)
        {
            if (label == nullptr || label[0] == '\0')
            {
                pData->engine->setLastError("null label");
                return false;
            }
        }

        juce::String fileOrIdentifier;

        if (std::strcmp(format, "AU") == 0)
        {
            fileOrIdentifier = label;
        }
        else
        {
            // VST2 and VST3 require filename
            if (filename == nullptr || filename[0] == '\0')
            {
                pData->engine->setLastError("null filename");
                return false;
            }

            juce::String jfilename(filename);

#ifdef CARLA_OS_WIN
            // Fix for wine usage
            if (juce::File("Z:\\usr\\").isDirectory() && filename[0] == '/')
            {
                jfilename.replace("/", "\\");
                jfilename = "Z:" + jfilename;
            }
#endif

            fileOrIdentifier = jfilename;

            if (label != nullptr && label[0] != '\0')
                fDesc.name = label;
        }

        /**/ if (std::strcmp(format, "AU") == 0)
        {
#if JUCE_PLUGINHOST_AU
            fFormatManager.addFormat(new juce::AudioUnitPluginFormat());
#endif
        }
        else if (std::strcmp(format, "VST2") == 0)
        {
#if JUCE_PLUGINHOST_VST
            fFormatManager.addFormat(new juce::VSTPluginFormat());
#endif
        }
        else if (std::strcmp(format, "VST3") == 0)
        {
#if JUCE_PLUGINHOST_VST3
            fFormatManager.addFormat(new juce::VST3PluginFormat());
#endif
        }
        else
        {
            fFormatManager.addDefaultFormats();
        }

        {
            juce::OwnedArray<juce::PluginDescription> pluginDescriptions;
            juce::KnownPluginList plist;

            {
               #if !(defined(CARLA_OS_WASM) || defined(CARLA_OS_WIN))
                const ScopedAbortCatcher sac;
               #endif

                for (int i = 0; i < fFormatManager.getNumFormats(); ++i)
                {
                    juce::AudioPluginFormat* const apformat = fFormatManager.getFormat(i);
                    CARLA_SAFE_ASSERT_CONTINUE(apformat != nullptr);

                    carla_debug("Trying to load '%s' plugin with format '%s'", fileOrIdentifier.toRawUTF8(), apformat->getName().toRawUTF8());

                    try {
                        plist.scanAndAddFile(fileOrIdentifier, true, pluginDescriptions, *apformat);
                    } CARLA_SAFE_EXCEPTION_CONTINUE("scanAndAddFile")

                   #if !(defined(CARLA_OS_WASM) || defined(CARLA_OS_WIN))
                    if (sac.wasTriggered())
                    {
                        carla_stderr("WARNING: Caught exception while scanning file, will not load this plugin");
                        pluginDescriptions.clearQuick(false);
                        break;
                    }
                   #endif
                }
            }

            if (pluginDescriptions.size() == 0)
            {
                pData->engine->setLastError("Failed to get plugin description");
                return false;
            }

            fDesc = *pluginDescriptions[0];
        }

        if (uniqueId != 0)
            fDesc.uniqueId = static_cast<int>(uniqueId);

        juce::String error;

        {
           #if !(defined(CARLA_OS_WASM) || defined(CARLA_OS_WIN))
            const ScopedAbortCatcher sac;
           #endif

            try {
                fInstance = fFormatManager.createPluginInstance(fDesc,
                                                                pData->engine->getSampleRate(),
                                                                static_cast<int>(pData->engine->getBufferSize()),
                                                                error);
            } CARLA_SAFE_EXCEPTION("createPluginInstance")

           #if !(defined(CARLA_OS_WASM) || defined(CARLA_OS_WIN))
            if (sac.wasTriggered())
            {
                fInstance = nullptr;
                carla_stderr("WARNING: Caught exception while instantiating, will not load this plugin");
            }
           #endif
        }

        if (fInstance == nullptr)
        {
            pData->engine->setLastError(error.toRawUTF8());
            return false;
        }

        fInstance->fillInPluginDescription(fDesc);
        fInstance->setPlayHead(this);
        fInstance->addListener(this);

        fFormatName = format;

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

        if (name != nullptr && name[0] != '\0')
            pData->name = pData->engine->getUniquePluginName(name);
        else
            pData->name = pData->engine->getUniquePluginName(fInstance->getName().toRawUTF8());

        if (filename != nullptr && filename[0] != '\0')
            pData->filename = carla_strdup(filename);

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

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

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

        // ---------------------------------------------------------------
        // set options

        pData->options  = 0x0;
        pData->options |= PLUGIN_OPTION_FIXED_BUFFERS;
        pData->options |= PLUGIN_OPTION_USE_CHUNKS;

        if (fInstance->acceptsMidi())
        {
            if (isPluginOptionEnabled(options, PLUGIN_OPTION_SEND_CONTROL_CHANGES))
                pData->options |= PLUGIN_OPTION_SEND_CONTROL_CHANGES;
            if (isPluginOptionEnabled(options, PLUGIN_OPTION_SEND_CHANNEL_PRESSURE))
                pData->options |= PLUGIN_OPTION_SEND_CHANNEL_PRESSURE;
            if (isPluginOptionEnabled(options, PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH))
                pData->options |= PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH;
            if (isPluginOptionEnabled(options, PLUGIN_OPTION_SEND_PITCHBEND))
                pData->options |= PLUGIN_OPTION_SEND_PITCHBEND;
            if (isPluginOptionEnabled(options, PLUGIN_OPTION_SEND_ALL_SOUND_OFF))
                pData->options |= PLUGIN_OPTION_SEND_ALL_SOUND_OFF;
            if (isPluginOptionEnabled(options, PLUGIN_OPTION_SEND_PROGRAM_CHANGES))
                pData->options |= PLUGIN_OPTION_SEND_PROGRAM_CHANGES;
            if (isPluginOptionInverseEnabled(options, PLUGIN_OPTION_SKIP_SENDING_NOTES))
                pData->options |= PLUGIN_OPTION_SKIP_SENDING_NOTES;
        }

        if (fInstance->getNumPrograms() > 1 && (pData->options & PLUGIN_OPTION_SEND_PROGRAM_CHANGES) == 0)
            if (isPluginOptionEnabled(options, PLUGIN_OPTION_MAP_PROGRAM_CHANGES))
                pData->options |= PLUGIN_OPTION_MAP_PROGRAM_CHANGES;

        return true;
    }

private:
    juce::PluginDescription    fDesc;
    juce::AudioPluginFormatManager fFormatManager;
    std::unique_ptr<juce::AudioPluginInstance> fInstance;

    juce::AudioSampleBuffer fAudioBuffer;
    juce::MidiBuffer        fMidiBuffer;
    CurrentPositionInfo     fPosInfo;
    juce::MemoryBlock       fChunk;
    juce::String            fFormatName;

    CarlaScopedPointer<JucePluginWindow> fWindow;

    bool fNeedsUpdate;

    bool isJuceSaveFormat(const void* const data, const std::size_t dataSize)
    {
        if (fFormatName != "VST2")
            return true;
        if (dataSize < 160)
            return false;

        const int32_t* const set = (const int32_t*)data;

        // chunkMagic
        if (! compareMagic(set[0], "CcnK"))
            return false;

        // version
        if (fxbSwap(set[3]) > 1)
            return false;

        // fxMagic, data contents depend on this value
        if (compareMagic(set[2], "FBCh") || compareMagic(set[2], "FJuc"))
        {
            const int32_t chunkSize = fxbSwap(set[39]);
            return static_cast<std::size_t>(chunkSize + 160) == dataSize;
        }
        if (compareMagic(set[2], "FxBk"))
        {
            const int32_t numPrograms = fxbSwap(set[6]);
            return numPrograms >= 1;
        }

        return false;
    }

    static bool compareMagic(int32_t magic, const char* name) noexcept
    {
        return magic == (int32_t)juce::ByteOrder::littleEndianInt (name)
            || magic == (int32_t)juce::ByteOrder::bigEndianInt (name);
    }

    static int32_t fxbSwap(const int32_t x) noexcept
    {
        return (int32_t)juce::ByteOrder::swapIfLittleEndian ((uint32_t) x);
    }

    CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CarlaPluginJuce)
};

CARLA_BACKEND_END_NAMESPACE

#endif // USING_JUCE

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

CARLA_BACKEND_START_NAMESPACE

CarlaPluginPtr CarlaPlugin::newJuce(const Initializer& init, const char* const format)
{
    carla_debug("CarlaPlugin::newJuce({%p, \"%s\", \"%s\", \"%s\", " P_INT64 "}, %s)",
                init.engine, init.filename, init.name, init.label, init.uniqueId, format);

#ifdef USING_JUCE
    std::shared_ptr<CarlaPluginJuce> plugin(new CarlaPluginJuce(init.engine, init.id));

    if (! plugin->init(plugin, init.filename, init.name, init.label, init.uniqueId, init.options, format))
        return nullptr;

    return plugin;
#else
    init.engine->setLastError("Juce-based plugin not available");
    return nullptr;

    // unused
    (void)format;
#endif
}

CARLA_BACKEND_END_NAMESPACE

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