Carla/source/backend/plugin/CarlaPluginJuce.cpp

/*
 * Carla Juce Plugin
 * Copyright (C) 2013-2019 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"

#if defined(USING_JUCE)

#include "CarlaBackendUtils.hpp"
#include "CarlaMathUtils.hpp"
#include "JucePluginWindow.hpp"

#include "juce_audio_processors/juce_audio_processors.h"

namespace juce {
extern bool juce_isRunningInWine();
}

CARLA_BACKEND_START_NAMESPACE

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

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

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

class CarlaPluginJuce : public CarlaPlugin,
                        private juce::AudioPlayHead,
                        private juce::AudioProcessorListener
{
public:
    CarlaPluginJuce(CarlaEngine* const engine, const uint id)
        : CarlaPlugin(engine, id),
          fDesc(),
          fInstance(nullptr),
          fFormatManager(),
          fAudioBuffer(),
          fMidiBuffer(),
          fPosInfo(),
          fChunk()
#if defined(CARLA_OS_MAC) || defined(CARLA_OS_WIN)
        , fWindow()
#endif
    {
        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();

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

        if (fInstance != nullptr)
        {
            delete fInstance;
            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.toRawUTF8());
    }

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

    // -------------------------------------------------------------------
    // 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_MAP_PROGRAM_CHANGES;
        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;
        }

        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);

        return fInstance->getParameter(static_cast<int>(parameterId));
    }

    void 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);
    }

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

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

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

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

        std::strncpy(strBuf, fInstance->getParameterName(static_cast<int>(parameterId), STR_MAX).toRawUTF8(), STR_MAX);
    }

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

        std::strncpy(strBuf, fInstance->getParameterText(static_cast<int>(parameterId), STR_MAX).toRawUTF8(), STR_MAX);
    }

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

        std::strncpy(strBuf, fInstance->getParameterLabel(static_cast<int>(parameterId)).toRawUTF8(), STR_MAX);
    }

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

    // nothing

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

#if defined(CARLA_OS_MAC) || defined(CARLA_OS_WIN)
    void setName(const char* const newName) override
    {
        CarlaPlugin::setName(newName);

        if (fWindow != nullptr)
        {
            juce::String uiName(pData->name);
            uiName += " (GUI)";
            fWindow->setName(uiName);
        }
    }
#endif

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

        const float fixedValue(pData->param.getFixedValue(parameterId, value));
        fInstance->setParameter(static_cast<int>(parameterId), value);

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

    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,);

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

#if defined(HAVE_LIBLO) && ! defined(BUILD_BRIDGE)
        const bool sendOsc(pData->engine->isOscControlRegistered());
#else
        const bool sendOsc(false);
#endif
        pData->updateParameterValues(this, sendOsc, 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);
    }

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

#if defined(CARLA_OS_MAC) || defined(CARLA_OS_WIN)
    void showCustomUI(const bool yesNo) override
    {
        CARLA_SAFE_ASSERT_RETURN(fInstance != nullptr,);

        if (yesNo)
        {
            if (fWindow == nullptr)
            {
                juce::String uiName(pData->name);
                uiName += " (GUI)";

                fWindow = new JucePluginWindow();
                fWindow->setName(uiName);
            }

            if (juce::AudioProcessorEditor* const editor = fInstance->createEditorIfNeeded())
                fWindow->show(editor);
        }
        else
        {
            if (fWindow != nullptr)
                fWindow->hide();

            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(ENGINE_CALLBACK_UI_STATE_CHANGED, pData->id, 0, 0, 0.0f, nullptr);
            }
        }

        CarlaPlugin::uiIdle();
    }
#endif

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

        fInstance->refreshParameterList();

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

        bool needsCtrlIn, needsCtrlOut;
        needsCtrlIn = needsCtrlOut = false;

        aIns   = (fInstance->getTotalNumInputChannels() > 0)  ? static_cast<uint32_t>(fInstance->getTotalNumInputChannels())  : 0;
        aOuts  = (fInstance->getTotalNumOutputChannels() > 0) ? static_cast<uint32_t>(fInstance->getTotalNumOutputChannels()) : 0;
        params = (fInstance->getNumParameters() > 0)          ? static_cast<uint32_t>(fInstance->getNumParameters())          : 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)
        {
            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);

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

            // TODO
            //const int numSteps(fInstance->getParameterNumSteps(static_cast<int>(j)));
            {
                min = 0.0f;
                max = 1.0f;
                step = 0.001f;
                stepSmall = 0.0001f;
                stepLarge = 0.1f;
            }

            pData->param.data[j].hints |= PARAMETER_IS_ENABLED;
#ifndef BUILD_BRIDGE
            pData->param.data[j].hints |= PARAMETER_USES_CUSTOM_TEXT;
#endif

            if (fInstance->isParameterAutomatable(static_cast<int>(j)))
                pData->param.data[j].hints |= PARAMETER_IS_AUTOMABLE;

            // FIXME?
            def = fInstance->getParameterDefaultValue(static_cast<int>(j));

            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);
        }

        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 defined(CARLA_OS_MAC) || defined(CARLA_OS_WIN)
        if (fInstance->hasEditor())
        {
            pData->hints |= PLUGIN_HAS_CUSTOM_UI;
            pData->hints |= PLUGIN_NEEDS_UI_MAIN_THREAD;
        }
#endif

        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->setPlayConfigDetails(static_cast<int>(aIns), static_cast<int>(aOuts), 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
        uint32_t newCount = (fInstance->getNumPrograms() > 0) ? static_cast<uint32_t>(fInstance->getNumPrograms()) : 0;

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

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

#if defined(HAVE_LIBLO) && ! defined(BUILD_BRIDGE)
        // Update OSC Names
        if (pData->engine->isOscControlRegistered() && pData->id < pData->engine->getCurrentPluginCount())
        {
            pData->engine->oscSend_control_set_program_count(pData->id, newCount);

            for (uint32_t i=0; i < newCount; ++i)
                pData->engine->oscSend_control_set_program_name(pData->id, i, pData->prog.names[i]);
        }
#endif

        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(ENGINE_CALLBACK_RELOAD_PROGRAMS, pData->id, 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 audioIn, float** const audioOut, const float** const, float** const, 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], static_cast<int>(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
            bool allNotesOffSent = false;
#endif
            for (uint32_t i=0, numEvents=pData->event.portIn->getEventCount(); i < numEvents; ++i)
            {
                const EngineEvent& event(pData->event.portIn->getEvent(i));

                if (event.time >= frames)
                    continue;

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

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

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

                    case kEngineControlEventTypeParameter: {
#ifndef BUILD_BRIDGE
                        // Control backend stuff
                        if (event.channel == pData->ctrlChannel)
                        {
                            float value;

                            if (MIDI_IS_CONTROL_BREATH_CONTROLLER(ctrlEvent.param) && (pData->hints & PLUGIN_CAN_DRYWET) != 0)
                            {
                                value = ctrlEvent.value;
                                setDryWet(value, false, false);
                                pData->postponeRtEvent(kPluginPostRtEventParameterChange, PARAMETER_DRYWET, 0, value);
                            }

                            if (MIDI_IS_CONTROL_CHANNEL_VOLUME(ctrlEvent.param) && (pData->hints & PLUGIN_CAN_VOLUME) != 0)
                            {
                                value = ctrlEvent.value*127.0f/100.0f;
                                setVolume(value, false, false);
                                pData->postponeRtEvent(kPluginPostRtEventParameterChange, PARAMETER_VOLUME, 0, value);
                            }

                            if (MIDI_IS_CONTROL_BALANCE(ctrlEvent.param) && (pData->hints & PLUGIN_CAN_BALANCE) != 0)
                            {
                                float left, right;
                                value = ctrlEvent.value/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;
                                }

                                setBalanceLeft(left, false, false);
                                setBalanceRight(right, false, false);
                                pData->postponeRtEvent(kPluginPostRtEventParameterChange, PARAMETER_BALANCE_LEFT, 0, left);
                                pData->postponeRtEvent(kPluginPostRtEventParameterChange, PARAMETER_BALANCE_RIGHT, 0, right);
                            }
                        }
#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].midiCC != ctrlEvent.param)
                                continue;
                            if (pData->param.data[k].type != PARAMETER_INPUT)
                                continue;
                            if ((pData->param.data[k].hints & PARAMETER_IS_AUTOMABLE) == 0)
                                continue;

                            float value;

                            if (pData->param.data[k].hints & PARAMETER_IS_BOOLEAN)
                            {
                                value = (ctrlEvent.value < 0.5f) ? pData->param.ranges[k].min : pData->param.ranges[k].max;
                            }
                            else
                            {
                                if (pData->param.data[k].hints & PARAMETER_IS_LOGARITHMIC)
                                    value = pData->param.ranges[k].getUnnormalizedLogValue(ctrlEvent.value);
                                else
                                    value = pData->param.ranges[k].getUnnormalizedValue(ctrlEvent.value);

                                if (pData->param.data[k].hints & PARAMETER_IS_INTEGER)
                                    value = std::rint(value);
                            }

                            setParameterValue(k, value, false, false, false);
                            pData->postponeRtEvent(kPluginPostRtEventParameterChange, static_cast<int32_t>(k), 0, value);
                        }

                        if ((pData->options & PLUGIN_OPTION_SEND_CONTROL_CHANGES) != 0 && ctrlEvent.param < MAX_MIDI_CONTROL)
                        {
                            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.value*127.0f);

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

                        break;
                    } // case kEngineControlEventTypeParameter

                    case kEngineControlEventTypeMidiBank:
                        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);
                                pData->postponeRtEvent(kPluginPostRtEventProgramChange, ctrlEvent.param, 0, 0.0f);
                                break;
                            }
                        }
                        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
                            if (event.channel == pData->ctrlChannel && ! allNotesOffSent)
                            {
                                allNotesOffSent = true;
                                sendMidiAllNotesOffToCallback();
                            }
#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_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->postponeRtEvent(kPluginPostRtEventNoteOn, event.channel, midiData[1], midiData[2]);
                    else if (status == MIDI_STATUS_NOTE_OFF)
                        pData->postponeRtEvent(kPluginPostRtEventNoteOff, event.channel, midiData[1], 0.0f);
                } 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)
        {
            const double ppqBar  = double(timeInfo.bbt.bar - 1) * timeInfo.bbt.beatsPerBar;
            const double ppqBeat = double(timeInfo.bbt.beat - 1);
            const double ppqTick = double(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);
    }

    bool processSingle(const float** 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], static_cast<int>(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)), static_cast<int>(frames));

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

        if (! fMidiBuffer.isEmpty())
        {
            if (pData->event.portOut != nullptr)
            {
                const uint8_t* midiEventData;
                int midiEventSize, midiEventPosition;

                for (juce::MidiBuffer::Iterator i(fMidiBuffer); i.getNextEvent(midiEventData, midiEventSize, midiEventPosition);)
                {
                    CARLA_SAFE_ASSERT_BREAK(midiEventPosition >= 0 && midiEventPosition < static_cast<int>(frames));
                    CARLA_SAFE_ASSERT_BREAK(midiEventSize > 0);

                    if (! pData->event.portOut->writeMidiEvent(static_cast<uint32_t>(midiEventPosition), static_cast<uint8_t>(midiEventSize), midiEventData))
                        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();
        }
    }

    // -------------------------------------------------------------------
    // 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*) override
    {
        pData->engine->callback(ENGINE_CALLBACK_UPDATE, pData->id, 0, 0, 0.0f, nullptr);
    }

    void audioProcessorParameterChangeGestureBegin(juce::AudioProcessor*, int) override {}
    void audioProcessorParameterChangeGestureEnd(juce::AudioProcessor*, int) override {}

    bool getCurrentPosition(CurrentPositionInfo& result) override
    {
        carla_copyStruct(result, fPosInfo);
        return true;
    }

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

public:
    bool init(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 and VST3 require label
        if (std::strcmp(format, "AU") == 0 || std::strcmp(format, "VST3") == 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::juce_isRunningInWine() && filename[0] == '/')
            {
                jfilename.replace("/", "\\");
                jfilename = "Z:" + jfilename;
            }
#endif

            fileOrIdentifier = jfilename;

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

        fFormatManager.addDefaultFormats();

        {
            juce::OwnedArray<juce::PluginDescription> pluginDescriptions;
            juce::KnownPluginList plist;
            for (int i = 0; i < fFormatManager.getNumFormats(); ++i)
                plist.scanAndAddFile(fileOrIdentifier, true, pluginDescriptions, *fFormatManager.getFormat(i));

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

            fDesc = *pluginDescriptions[0];
        }

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

        juce::String error;
        fInstance = fFormatManager.createPluginInstance(fDesc,
                                                        pData->engine->getSampleRate(),
                                                        static_cast<int>(pData->engine->getBufferSize()),
                                                        error);

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

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

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

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

        pData->filename = carla_strdup(filename);

        // ---------------------------------------------------------------
        // 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;
        }

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

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

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

        if (fInstance->acceptsMidi())
        {
            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;

            if (options & PLUGIN_OPTION_SEND_CONTROL_CHANGES)
                pData->options |= PLUGIN_OPTION_SEND_CONTROL_CHANGES;
        }

        return true;
    }

private:
    juce::PluginDescription    fDesc;
    juce::AudioPluginInstance* fInstance;
    juce::AudioPluginFormatManager fFormatManager;

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

#if defined(CARLA_OS_MAC) || defined(CARLA_OS_WIN)
    ScopedPointer<JucePluginWindow> fWindow;
#endif

    CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CarlaPluginJuce)
};

CARLA_BACKEND_END_NAMESPACE

#endif // USING_JUCE

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

CARLA_BACKEND_START_NAMESPACE

CarlaPlugin* 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
    CarlaPluginJuce* const plugin(new CarlaPluginJuce(init.engine, init.id));

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

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

    // unused
    (void)format;
#endif
}

CARLA_BACKEND_END_NAMESPACE

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