Carla/source/backend/standalone/CarlaStandalone.cpp

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

// TODO:
// Check carla_stderr2("Engine is not running"); <= prepend func name and args

#include "CarlaHost.hpp"
#include "CarlaEngine.hpp"
#include "CarlaPlugin.hpp"

#include "CarlaBackendUtils.hpp"
#include "CarlaOscUtils.hpp"
#include "CarlaNative.h"

#ifdef USE_JUCE
# include "juce_gui_basics.h"
#endif

//#include "CarlaLogThread.hpp"
//#if ! (defined(DEBUG) || defined(WANT_LOGS) || defined(BUILD_ANSI_TEST))
//# define WANT_LOGS
//#endif

namespace CB = CarlaBackend;

using CB::CarlaEngine;
using CB::CarlaPlugin;
using CB::EngineCallbackFunc;
using CB::EngineOptions;
using CB::EngineTimeInfo;
using CB::FileCallbackFunc;

#ifdef USE_JUCE
using namespace juce;

// -----------------------------------------------------------------------
// Juce Message Thread

class JuceMessageThread : public Thread
{
public:
    JuceMessageThread()
      : Thread("JuceMessageThread"),
        fInitialised(false)
    {
        startThread(7);

        while (! fInitialised)
            sleep(1);
    }

    ~JuceMessageThread()
    {
        signalThreadShouldExit();
        JUCEApplication::quit();
        waitForThreadToExit(5000);
        clearSingletonInstance();
    }

    void run()
    {
        initialiseJuce_GUI();
        fInitialised = true;

        MessageManager::getInstance()->setCurrentThreadAsMessageThread();

        while ((! threadShouldExit()) && MessageManager::getInstance()->runDispatchLoopUntil(250))
        {}
    }

    juce_DeclareSingleton(JuceMessageThread, false);

private:
    bool fInitialised;
};

juce_ImplementSingleton(JuceMessageThread)
#endif

// -------------------------------------------------------------------------------------------------------------------
// Single, standalone engine

struct CarlaBackendStandalone {
    EngineCallbackFunc callback;
    void*              callbackPtr;

    CarlaEngine*  engine;
    CarlaString   lastError;
    EngineOptions options;

    CarlaBackendStandalone()
        : callback(nullptr),
          callbackPtr(nullptr),
          engine(nullptr) {}

    ~CarlaBackendStandalone()
    {
        CARLA_ASSERT(engine == nullptr);
#ifdef USE_JUCE
        CARLA_ASSERT(MessageManager::getInstanceWithoutCreating() == nullptr);
#endif
    }

    void init()
    {
#ifdef USE_JUCE
        JUCE_AUTORELEASEPOOL

        initialiseJuce_GUI();
        JuceMessageThread::getInstance();
#endif
    }

    void idle() {}

    void close()
    {
#ifdef USE_JUCE
        JUCE_AUTORELEASEPOOL

        JuceMessageThread::deleteInstance();
        shutdownJuce_GUI();
#endif
    }

    CARLA_DECLARE_NON_COPY_STRUCT(CarlaBackendStandalone)
};

struct CarlaBackendFileHandler {
    FileCallbackFunc callback;
    void*            callbackPtr;

    CarlaBackendFileHandler()
        : callback(nullptr),
          callbackPtr(nullptr) {}
};

//#ifdef WANT_LOGS
//static CarlaLogThread gLogThread;
//#endif
static CarlaBackendStandalone  gStandalone;
static CarlaBackendFileHandler gFileHandler;

// -------------------------------------------------------------------------------------------------------------------
// API

const char* carla_get_extended_license_text()
{
    carla_debug("carla_get_extended_license_text()");

    static CarlaString retText;

    if (retText.isEmpty())
    {
        CarlaString text1, text2, text3, text4, text5;

        text1 += "<p>This current Carla build is using the following features and 3rd-party code:</p>";
        text1 += "<ul>";

        // Plugin formats
#ifdef WANT_LADSPA
        text2 += "<li>LADSPA plugin support, http://www.ladspa.org/</li>";
#endif
#ifdef WANT_DSSI
        text2 += "<li>DSSI plugin support, http://dssi.sourceforge.net/</li>";
#endif
#ifdef WANT_LV2
        text2 += "<li>LV2 plugin support, http://lv2plug.in/</li>";
#endif
#ifdef WANT_VST
# ifdef VESTIGE_HEADER
        text2 += "<li>VST plugin support, using VeSTige header by Javier Serrano Polo</li>";
# else
        text2 += "<li>VST plugin support, using official VST SDK 2.4 (trademark of Steinberg Media Technologies GmbH)</li>";
# endif
#endif
#ifdef WANT_AU
        text2 += "<li>AU plugin support</li>"; // FIXME
#endif

        // Files
#ifdef WANT_CSOUND
        text2 += "<li>CSound library for csd support</li>"; // FIXME
#endif

        // Sample kit libraries
#ifdef WANT_FLUIDSYNTH
        text2 += "<li>FluidSynth library for SF2 support, http://www.fluidsynth.org/</li>";
#endif
#ifdef WANT_LINUXSAMPLER
        text2 += "<li>LinuxSampler library for GIG and SFZ support*, http://www.linuxsampler.org/</li>";
#endif

        // Internal plugins
#ifdef WANT_OPENGL
        text3 += "<li>DISTRHO Mini-Series plugin code, based on LOSER-dev suite by Michael Gruhn</li>";
#endif
        text3 += "<li>NekoFilter plugin code, based on lv2fil by Nedko Arnaudov and Fons Adriaensen</li>";
        //text1 += "<li>SunVox library file support, http://www.warmplace.ru/soft/sunvox/</li>"; // unfinished

#ifdef WANT_AUDIOFILE
        text3 += "<li>AudioDecoder library for Audio file support, by Robin Gareus</li>";
#endif
#ifdef WANT_MIDIFILE
        text3 += "<li>LibSMF library for MIDI file support, http://libsmf.sourceforge.net/</li>";
#endif
#ifdef WANT_ZYNADDSUBFX
        text3 += "<li>ZynAddSubFX plugin code, http://zynaddsubfx.sf.net/</li>";
# ifdef WANT_ZYNADDSUBFX_UI
        text3 += "<li>ZynAddSubFX UI using NTK, http://non.tuxfamily.org/wiki/NTK</li>";
# endif
#endif

        // misc libs
        text4 += "<li>liblo library for OSC support, http://liblo.sourceforge.net/</li>";
#ifdef WANT_LV2
        text4 += "<li>serd, sord, sratom and lilv libraries for LV2 discovery, http://drobilla.net/software/lilv/</li>";
#endif
        text4 += "<li>RtAudio+RtMidi libraries for extra Audio and MIDI support, http://www.music.mcgill.ca/~gary/rtaudio/</li>";

        // end
        text4 += "</ul>";

        // code snippets
        text5 += "<p>Additionally, Carla uses code snippets from the following projects:</p>";
        text5 += "<ul>";
        text5 += "<li>Pointer and data leak utils from JUCE, http://www.rawmaterialsoftware.com/juce.php</li>";
        text5 += "<li>Shared memory utils from dssi-vst, http://www.breakfastquay.com/dssi-vst/</li>";
        text5 += "<li>Real-time memory pool, by Nedko Arnaudov</li>";
        text5 += "</ul>";

        // LinuxSampler GPL exception
#ifdef WANT_LINUXSAMPLER
        text5 += "<p>(*) Using LinuxSampler code in commercial hardware or software products is not allowed without prior written authorization by the authors.</p>";
#endif

        retText = text1 + text2 + text3 + text4 + text5;
    }

    return retText;
}

const char* carla_get_supported_file_types()
{
    carla_debug("carla_get_supported_file_types()");

    static CarlaString retText;

    if (retText.isEmpty())
    {
        // Base types
        retText += "*.carxp;*.carxs";

        // CSound
#ifdef WANT_CSOUND
        retText += ";*.csd";
#endif

        // Sample kits
#ifdef WANT_FLUIDSYNTH
        retText += ";*.sf2";
#endif
#ifdef WANT_LINUXSAMPLER
        retText += ";*.gig;*.sfz";
#endif

        // Files provided by internal plugins
#ifdef WANT_AUDIOFILE
        retText += ";*.aiff;*.flac;*.oga;*.ogg;*.w64;*.wav";
# ifdef HAVE_FFMPEG
        retText += ";*.3g2;*.3gp;*.aac;*.ac3;*.amr;*.ape;*.mp2;*.mp3;*.mpc;*.wma";
# endif
#endif
#ifdef WANT_MIDIFILE
        retText += ";*.mid;*.midi";
#endif

        // Plugin presets
#ifdef WANT_ZYNADDSUBFX
        retText += ";*.xmz;*.xiz";
#endif
    }

    return retText;
}

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

unsigned int carla_get_engine_driver_count()
{
    carla_debug("carla_get_engine_driver_count()");

    return CarlaEngine::getDriverCount();
}

const char* carla_get_engine_driver_name(unsigned int index)
{
    carla_debug("carla_get_engine_driver_info(%i)", index);

    return CarlaEngine::getDriverName(index);
}

const char* const* carla_get_engine_driver_device_names(unsigned int index)
{
    carla_debug("carla_get_engine_driver_device_names(%i)", index);

    return CarlaEngine::getDriverDeviceNames(index);
}

const CarlaEngineDriverDeviceInfo* carla_get_engine_driver_device_info(unsigned int index, const char* deviceName)
{
    carla_debug("carla_get_engine_driver_device_info(%i, \"%s\")", index, deviceName);

    return CarlaEngine::getDriverDeviceInfo(index, deviceName);
}

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

unsigned int carla_get_internal_plugin_count()
{
    carla_debug("carla_get_internal_plugin_count()");

#ifdef WANT_NATIVE
    return static_cast<unsigned int>(CarlaPlugin::getNativePluginCount());
#else
    return 0;
#endif
}

const CarlaNativePluginInfo* carla_get_internal_plugin_info(unsigned int internalPluginId)
{
    carla_debug("carla_get_internal_plugin_info(%i)", internalPluginId);

    static CarlaNativePluginInfo info;

#ifdef WANT_NATIVE
    const PluginDescriptor* const nativePlugin(CarlaPlugin::getNativePluginDescriptor(internalPluginId));

    // as internal plugin, this must never fail
    CARLA_SAFE_ASSERT_RETURN(nativePlugin != nullptr, nullptr);

     info.category = static_cast<CarlaPluginCategory>(nativePlugin->category);
     info.hints    = 0x0;

     if (nativePlugin->hints & PLUGIN_IS_RTSAFE)
         info.hints |= CB::PLUGIN_IS_RTSAFE;
     if (nativePlugin->hints & PLUGIN_HAS_GUI)
         info.hints |= CB::PLUGIN_HAS_GUI;
     if (nativePlugin->hints & PLUGIN_NEEDS_SINGLE_THREAD)
         info.hints |= CB::PLUGIN_NEEDS_SINGLE_THREAD;
     if (nativePlugin->hints & PLUGIN_NEEDS_FIXED_BUFFERS)
         info.hints |= CB::PLUGIN_NEEDS_FIXED_BUFFERS;

     info.audioIns  = nativePlugin->audioIns;
     info.audioOuts = nativePlugin->audioOuts;
     info.midiIns   = nativePlugin->midiIns;
     info.midiOuts  = nativePlugin->midiOuts;
     info.parameterIns  = nativePlugin->paramIns;
     info.parameterOuts = nativePlugin->paramOuts;

     info.name      = nativePlugin->name;
     info.label     = nativePlugin->label;
     info.maker     = nativePlugin->maker;
     info.copyright = nativePlugin->copyright;
#endif

    return &info;

#ifndef WANT_NATIVE
    // unused
    (void)internalPluginId;
#endif
}

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

bool carla_engine_init(const char* driverName, const char* clientName)
{
    CARLA_SAFE_ASSERT_RETURN(driverName != nullptr && driverName[0] != '\0', false);
    CARLA_SAFE_ASSERT_RETURN(clientName != nullptr && clientName[0] != '\0', false);
    carla_debug("carla_engine_init(\"%s\", \"%s\")", driverName, clientName);

    if (gStandalone.engine != nullptr)
    {
        carla_stderr2("Engine is already running");
        gStandalone.lastError = "Engine is already running";
        return false;
    }

#ifdef CARLA_OS_WIN
    carla_setenv("WINEASIO_CLIENT_NAME", clientName);
#endif

    // TODO: make this an option, put somewhere else
    if (getenv("WINE_RT") == nullptr)
    {
        carla_setenv("WINE_RT", "15");
        carla_setenv("WINE_SVR_RT", "10");
    }

    gStandalone.engine = CarlaEngine::newDriverByName(driverName);

    if (gStandalone.engine == nullptr)
    {
        carla_stderr2("The seleted audio driver is not available");
        gStandalone.lastError = "The seleted audio driver is not available";
        return false;
    }

    if (gStandalone.callback != nullptr)
        gStandalone.engine->setCallback(gStandalone.callback, gStandalone.callbackPtr);

#ifndef BUILD_BRIDGE
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PROCESS_MODE,                static_cast<int>(gStandalone.options.processMode),      nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_TRANSPORT_MODE,              static_cast<int>(gStandalone.options.transportMode),    nullptr);
#endif
    gStandalone.engine->setOption(CB::ENGINE_OPTION_FORCE_STEREO,                gStandalone.options.forceStereo         ? 1 : 0,        nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PREFER_PLUGIN_BRIDGES,       gStandalone.options.preferPluginBridges ? 1 : 0,        nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PREFER_UI_BRIDGES,           gStandalone.options.preferUiBridges     ? 1 : 0,        nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_UIS_ALWAYS_ON_TOP,           gStandalone.options.uisAlwaysOnTop      ? 1 : 0,        nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_MAX_PARAMETERS,              static_cast<int>(gStandalone.options.maxParameters),    nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_UI_BRIDGES_TIMEOUT,          static_cast<int>(gStandalone.options.uiBridgesTimeout), nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_AUDIO_NUM_PERIODS,           static_cast<int>(gStandalone.options.audioNumPeriods),  nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_AUDIO_BUFFER_SIZE,           static_cast<int>(gStandalone.options.audioBufferSize),  nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_AUDIO_SAMPLE_RATE,           static_cast<int>(gStandalone.options.audioSampleRate),  nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_AUDIO_DEVICE,             0, (const char*)gStandalone.options.audioDevice);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_RESOURCES,           0, (const char*)gStandalone.options.resourceDir);
#ifndef BUILD_BRIDGE
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_NATIVE,       0, (const char*)gStandalone.options.bridge_native);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_POSIX32,      0, (const char*)gStandalone.options.bridge_posix32);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_POSIX64,      0, (const char*)gStandalone.options.bridge_posix64);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_WIN32,        0, (const char*)gStandalone.options.bridge_win32);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_WIN64,        0, (const char*)gStandalone.options.bridge_win64);
#endif
#ifdef WANT_LV2
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_EXTERNAL, 0, (const char*)gStandalone.options.bridge_lv2Extrn);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_GTK2,     0, (const char*)gStandalone.options.bridge_lv2Gtk2);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_GTK3,     0, (const char*)gStandalone.options.bridge_lv2Gtk3);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_QT4,      0, (const char*)gStandalone.options.bridge_lv2Qt4);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_QT5,      0, (const char*)gStandalone.options.bridge_lv2Qt5);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_COCOA,    0, (const char*)gStandalone.options.bridge_lv2Cocoa);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_WINDOWS,  0, (const char*)gStandalone.options.bridge_lv2Win);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_LV2_X11,      0, (const char*)gStandalone.options.bridge_lv2X11);
#endif
#ifdef WANT_VST
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_VST_MAC,      0, (const char*)gStandalone.options.bridge_vstMac);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_VST_HWND,     0, (const char*)gStandalone.options.bridge_vstHWND);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PATH_BRIDGE_VST_X11,      0, (const char*)gStandalone.options.bridge_vstX11);
#endif

    if (gStandalone.engine->init(clientName))
    {
        gStandalone.lastError = "no error";
        gStandalone.init();
        return true;
    }
    else
    {
        gStandalone.lastError = gStandalone.engine->getLastError();
        delete gStandalone.engine;
        gStandalone.engine = nullptr;
        return false;
    }
}

#ifdef BUILD_BRIDGE
bool carla_engine_init_bridge(const char* audioBaseName, const char* controlBaseName, const char* clientName)
{
    CARLA_SAFE_ASSERT_RETURN(audioBaseName != nullptr && audioBaseName[0] != '\0', false);
    CARLA_SAFE_ASSERT_RETURN(controlBaseName != nullptr && controlBaseName[0] != '\0', false);
    CARLA_SAFE_ASSERT_RETURN(clientName != nullptr && clientName[0] != '\0', false);
    carla_debug("carla_engine_init_bridge(\"%s\", %s, %s)", audioBaseName, controlBaseName, clientName);

    if (gStandalone.engine != nullptr)
    {
        carla_stderr2("Engine is already running");
        gStandalone.lastError = "Engine is already running";
        return false;
    }

    gStandalone.engine = CarlaEngine::newBridge(audioBaseName, controlBaseName);

    if (gStandalone.engine == nullptr)
    {
        carla_stderr2("The seleted audio driver is not available!");
        gStandalone.lastError = "The seleted audio driver is not available!";
        return false;
    }

    if (gStandalone.callback != nullptr)
        gStandalone.engine->setCallback(gStandalone.callback, gStandalone.callbackPtr);

    gStandalone.engine->setOption(CB::ENGINE_OPTION_PROCESS_MODE,          CB::PROCESS_MODE_BRIDGE,   nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_TRANSPORT_MODE,        CB::TRANSPORT_MODE_BRIDGE, nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_FORCE_STEREO,          false, nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PREFER_PLUGIN_BRIDGES, false, nullptr);
    gStandalone.engine->setOption(CB::ENGINE_OPTION_PREFER_UI_BRIDGES,     false, nullptr);
    //gStandalone.engine->setOption(CB::ENGINE_OPTION_UIS_ALWAYS_ON_TOP,     gStandalone.options.uisAlwaysOnTop      ? 1 : 0,        nullptr);
    //gStandalone.engine->setOption(CB::ENGINE_OPTION_MAX_PARAMETERS,        static_cast<int>(gStandalone.options.maxParameters),    nullptr);
    //gStandalone.engine->setOption(CB::ENGINE_OPTION_UI_BRIDGES_TIMEOUT,    static_cast<int>(gStandalone.options.uiBridgesTimeout), nullptr);

    if (gStandalone.engine->init(clientName))
    {
        gStandalone.lastError = "no error";
        gStandalone.init();
        return true;
    }
    else
    {
        gStandalone.lastError = gStandalone.engine->getLastError();
        delete gStandalone.engine;
        gStandalone.engine = nullptr;
        return false;
    }
}
#endif

bool carla_engine_close()
{
    carla_debug("carla_engine_close()");

    if (gStandalone.engine == nullptr)
    {
        carla_stderr2("Engine is not running");
        gStandalone.lastError = "Engine is not running";
        return false;
    }

    gStandalone.engine->setAboutToClose();
    gStandalone.engine->removeAllPlugins();

    const bool closed(gStandalone.engine->close());

    if (! closed)
        gStandalone.lastError = gStandalone.engine->getLastError();

    gStandalone.close();

    delete gStandalone.engine;
    gStandalone.engine = nullptr;

    return closed;
}

void carla_engine_idle()
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);

    gStandalone.idle();
    gStandalone.engine->idle();
}

bool carla_is_engine_running()
{
    return (gStandalone.engine != nullptr && gStandalone.engine->isRunning());
}

void carla_set_engine_about_to_close()
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_engine_about_to_close()");

    gStandalone.engine->setAboutToClose();
}

void carla_set_engine_callback(CarlaEngineCallbackFunc func, void* ptr)
{
    carla_debug("carla_set_engine_callback(%p, %p)", func, ptr);

    gStandalone.callback    = func;
    gStandalone.callbackPtr = ptr;

    if (gStandalone.engine != nullptr)
        gStandalone.engine->setCallback(func, ptr);

//#ifdef WANT_LOGS
//    gLogThread.setCallback(func, ptr);
//#endif
}

void carla_set_engine_option(CarlaEngineOption option, int value, const char* valueStr)
{
    carla_debug("carla_set_engine_option(%i:%s, %i, \"%s\")", option, CB::EngineOption2Str(option), value, valueStr);

    switch (option)
    {
    case CB::ENGINE_OPTION_PROCESS_NAME:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
#ifdef USE_JUCE
        juce::Thread::setCurrentThreadName(valueStr);
#endif
        break;

    case CB::ENGINE_OPTION_PROCESS_MODE:
        CARLA_SAFE_ASSERT_RETURN(value >= CB::ENGINE_PROCESS_MODE_SINGLE_CLIENT && value <= CB::ENGINE_PROCESS_MODE_BRIDGE,);
        gStandalone.options.processMode = static_cast<CB::EngineProcessMode>(value);
        break;

    case CB::ENGINE_OPTION_TRANSPORT_MODE:
        CARLA_SAFE_ASSERT_RETURN(value >= CB::ENGINE_TRANSPORT_MODE_INTERNAL && value <= CB::ENGINE_TRANSPORT_MODE_BRIDGE,);
        gStandalone.options.transportMode = static_cast<CB::EngineTransportMode>(value);
        break;

    case CB::ENGINE_OPTION_FORCE_STEREO:
        CARLA_SAFE_ASSERT_RETURN(value == 0 || value == 1,);
        gStandalone.options.forceStereo = (value != 0);
        break;

    case CB::ENGINE_OPTION_PREFER_PLUGIN_BRIDGES:
        CARLA_SAFE_ASSERT_RETURN(value == 0 || value == 1,);
        gStandalone.options.preferPluginBridges = (value != 0);
        break;

    case CB::ENGINE_OPTION_PREFER_UI_BRIDGES:
        CARLA_SAFE_ASSERT_RETURN(value == 0 || value == 1,);
        gStandalone.options.preferUiBridges = (value != 0);
        break;

    case CB::ENGINE_OPTION_UIS_ALWAYS_ON_TOP:
        CARLA_SAFE_ASSERT_RETURN(value == 0 || value == 1,);
        gStandalone.options.uisAlwaysOnTop = (value != 0);
        break;

    case CB::ENGINE_OPTION_MAX_PARAMETERS:
        CARLA_SAFE_ASSERT_RETURN(value >= 0,);
        gStandalone.options.maxParameters = static_cast<unsigned int>(value);
        break;

    case CB::ENGINE_OPTION_UI_BRIDGES_TIMEOUT:
        CARLA_SAFE_ASSERT_RETURN(value >= 0,);
        gStandalone.options.uiBridgesTimeout = static_cast<unsigned int>(value);
        break;

    case CB::ENGINE_OPTION_AUDIO_NUM_PERIODS:
        CARLA_SAFE_ASSERT_RETURN(value == 2 || value == 3,);
        gStandalone.options.audioNumPeriods = static_cast<unsigned int>(value);
        break;

    case CB::ENGINE_OPTION_AUDIO_BUFFER_SIZE:
        CARLA_SAFE_ASSERT_RETURN(value >= 8,);
        gStandalone.options.audioBufferSize = static_cast<unsigned int>(value);
        break;

    case CB::ENGINE_OPTION_AUDIO_SAMPLE_RATE:
        CARLA_SAFE_ASSERT_RETURN(value >= 22050,);
        gStandalone.options.audioSampleRate = static_cast<unsigned int>(value);
        break;

    case CB::ENGINE_OPTION_AUDIO_DEVICE:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.audioDevice = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_RESOURCES:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.resourceDir = valueStr;
        break;

#ifndef BUILD_BRIDGE
    case CB::ENGINE_OPTION_PATH_BRIDGE_NATIVE:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_native = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_POSIX32:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_posix32 = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_POSIX64:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_posix64 = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_WIN32:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_win32 = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_WIN64:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_win64 = valueStr;
        break;
#endif

#ifdef WANT_LV2
    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_EXTERNAL:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Extrn = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_GTK2:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Gtk2 = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_GTK3:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Gtk3 = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_NTK:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Ntk = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_QT4:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Qt4 = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_QT5:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Qt5 = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_COCOA:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Cocoa = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_WINDOWS:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2Win = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_LV2_X11:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_lv2X11 = valueStr;
        break;
#endif

#ifdef WANT_VST
    case CB::ENGINE_OPTION_PATH_BRIDGE_VST_MAC:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_vstMac = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_VST_HWND:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_vstHWND = valueStr;
        break;

    case CB::ENGINE_OPTION_PATH_BRIDGE_VST_X11:
        CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
        gStandalone.options.bridge_vstX11 = valueStr;
        break;
#endif
    }

    if (gStandalone.engine != nullptr)
        gStandalone.engine->setOption(option, value, valueStr);
}

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

void carla_set_file_callback(CarlaFileCallbackFunc func, void* ptr)
{
    carla_debug("carla_set_file_callback(%p, %p)", func, ptr);

    gFileHandler.callback    = func;
    gFileHandler.callbackPtr = ptr;
}

const char* carla_file_callback(CarlaFileCallbackOpcode action, bool isDir, const char* title, const char* filter)
{
    if (gFileHandler.callback == nullptr)
        return nullptr;

    return gFileHandler.callback(gFileHandler.callbackPtr, action, isDir, title, filter);
}

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

bool carla_load_filename(const char* filename)
{
    CARLA_SAFE_ASSERT_RETURN(filename != nullptr && filename[0] != '\0', false);
    carla_debug("carla_load_filename(\"%s\")", filename);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->loadFilename(filename);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_load_project(const char* filename)
{
    CARLA_SAFE_ASSERT_RETURN(filename != nullptr && filename[0] != '\0', false);
    carla_debug("carla_load_project(\"%s\")", filename);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->loadProject(filename);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_save_project(const char* filename)
{
    CARLA_SAFE_ASSERT_RETURN(filename != nullptr && filename[0] != '\0', false);
    carla_debug("carla_save_project(\"%s\")", filename);

    // allow to save even if engine isn't running
    if (gStandalone.engine != nullptr)
        return gStandalone.engine->saveProject(filename);

    carla_stderr2("Engine was never initiated");
    gStandalone.lastError = "Engine was never initiated";
    return false;
}

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

bool carla_patchbay_connect(int portA, int portB)
{
    CARLA_SAFE_ASSERT_RETURN(portA != portB, false);
    carla_debug("carla_patchbay_connect(%i, %i)", portA, portB);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->patchbayConnect(portA, portB);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_patchbay_disconnect(int connectionId)
{
    carla_debug("carla_patchbay_disconnect(%i)", connectionId);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->patchbayDisconnect(connectionId);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_patchbay_refresh()
{
    carla_debug("carla_patchbay_refresh()");

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
    {
        gStandalone.engine->patchbayRefresh();
        return true;
    }

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

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

void carla_transport_play()
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr && gStandalone.engine->isRunning(),);
    carla_debug("carla_transport_play()");

    gStandalone.engine->transportPlay();
}

void carla_transport_pause()
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr && gStandalone.engine->isRunning(),);
    carla_debug("carla_transport_pause()");

    gStandalone.engine->transportPause();
}

void carla_transport_relocate(uint32_t frames)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr && gStandalone.engine->isRunning(),);
    carla_debug("carla_transport_relocate(%i)", frames);

    gStandalone.engine->transportRelocate(frames);
}

uint64_t carla_get_current_transport_frame()
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0);

    const EngineTimeInfo& timeInfo(gStandalone.engine->getTimeInfo());
    return timeInfo.frame;
}

const CarlaTransportInfo* carla_get_transport_info()
{
    static CarlaTransportInfo info;

    // reset
    info.playing = false;
    info.frame   = 0;
    info.bar     = 0;
    info.beat    = 0;
    info.tick    = 0;
    info.bpm     = 0.0;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &info);

    const EngineTimeInfo& timeInfo(gStandalone.engine->getTimeInfo());

    info.playing = timeInfo.playing;
    info.frame   = timeInfo.frame;

    if (timeInfo.valid & timeInfo.ValidBBT)
    {
        info.bar  = timeInfo.bbt.bar;
        info.beat = timeInfo.bbt.beat;
        info.tick = timeInfo.bbt.tick;
        info.bpm  = timeInfo.bbt.beatsPerMinute;
    }

    return &info;
}

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

bool carla_add_plugin(CarlaBinaryType btype, CarlaPluginType ptype, const char* filename, const char* const name, const char* label, const void* extraStuff)
{
    CARLA_SAFE_ASSERT_RETURN(label != nullptr && label[0] != '\0', false);
    carla_debug("carla_add_plugin(%i:%s, %i:%s, \"%s\", \"%s\", \"%s\", %p)", btype, CB::BinaryType2Str(btype), ptype, CB::PluginType2Str(ptype), filename, name, label, extraStuff);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->addPlugin(btype, ptype, filename, name, label, extraStuff);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_remove_plugin(unsigned int pluginId)
{
    carla_debug("carla_remove_plugin(%i)", pluginId);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->removePlugin(pluginId);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_remove_all_plugins()
{
    carla_debug("carla_remove_all_plugins()");

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
    {
        gStandalone.engine->removeAllPlugins();
        return true;
    }

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

const char* carla_rename_plugin(unsigned int pluginId, const char* newName)
{
    CARLA_SAFE_ASSERT_RETURN(newName != nullptr && newName[0] != '\0', nullptr);
    carla_debug("carla_rename_plugin(%i, \"%s\")", pluginId, newName);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->renamePlugin(pluginId, newName);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return nullptr;
}

bool carla_clone_plugin(unsigned int pluginId)
{
    carla_debug("carla_clone_plugin(%i)", pluginId);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->clonePlugin(pluginId);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_replace_plugin(unsigned int pluginId)
{
    carla_debug("carla_replace_plugin(%i)", pluginId);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->replacePlugin(pluginId);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

bool carla_switch_plugins(unsigned int pluginIdA, unsigned int pluginIdB)
{
    CARLA_SAFE_ASSERT_RETURN(pluginIdA != pluginIdB, false);
    carla_debug("carla_switch_plugins(%i, %i)", pluginIdA, pluginIdB);

    if (gStandalone.engine != nullptr && gStandalone.engine->isRunning())
        return gStandalone.engine->switchPlugins(pluginIdA, pluginIdB);

    carla_stderr2("Engine is not running");
    gStandalone.lastError = "Engine is not running";
    return false;
}

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

bool carla_load_plugin_state(unsigned int pluginId, const char* filename)
{
    CARLA_SAFE_ASSERT_RETURN(filename != nullptr && filename[0] != '\0', false);
    carla_debug("carla_load_plugin_state(%i, \"%s\")", pluginId, filename);

    if (gStandalone.engine == nullptr || ! gStandalone.engine->isRunning())
    {
        carla_stderr2("Engine is not running");
        gStandalone.lastError = "Engine is not running";
        return false;
    }

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->loadStateFromFile(filename);

    carla_stderr2("carla_load_plugin_state(%i, \"%s\") - could not find plugin", pluginId, filename);
    return false;
}

bool carla_save_plugin_state(unsigned int pluginId, const char* filename)
{
    CARLA_SAFE_ASSERT_RETURN(filename != nullptr && filename[0] != '\0', false);
    carla_debug("carla_save_plugin_state(%i, \"%s\")", pluginId, filename);

    if (gStandalone.engine == nullptr)
    {
        carla_stderr2("Engine is not running");
        gStandalone.lastError = "Engine is not running";
        return false;
    }

    // allow to save even if engine isn't running

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->saveStateToFile(filename);

    carla_stderr2("carla_save_plugin_state(%i, \"%s\") - could not find plugin", pluginId, filename);
    return false;
}

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

const CarlaPluginInfo* carla_get_plugin_info(unsigned int pluginId)
{
    carla_debug("carla_get_plugin_info(%i)", pluginId);

    static CarlaPluginInfo info;

    // reset
    info.type             = CB::PLUGIN_NONE;
    info.category         = CB::PLUGIN_CATEGORY_NONE;
    info.hints            = 0x0;
    info.optionsAvailable = 0x0;
    info.optionsEnabled   = 0x0;
    info.binary           = nullptr;
    info.name             = nullptr;
    info.iconName         = nullptr;
    info.patchbayClientId = 0;
    info.uniqueId         = 0;

    // cleanup
    if (info.label != nullptr)
    {
        delete[] info.label;
        info.label = nullptr;
    }

    if (info.maker != nullptr)
    {
        delete[] info.maker;
        info.maker = nullptr;
    }

    if (info.copyright != nullptr)
    {
        delete[] info.copyright;
        info.copyright = nullptr;
    }

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &info);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        char strBufLabel[STR_MAX+1];
        char strBufMaker[STR_MAX+1];
        char strBufCopyright[STR_MAX+1];

        carla_zeroChar(strBufLabel, STR_MAX+1);
        carla_zeroChar(strBufMaker, STR_MAX+1);
        carla_zeroChar(strBufCopyright, STR_MAX+1);

        info.type     = plugin->getType();
        info.category = plugin->getCategory();
        info.hints    = plugin->getHints();
        info.binary   = plugin->getFilename();
        info.name     = plugin->getName();
        info.iconName = plugin->getIconName();
        info.uniqueId = plugin->getUniqueId();

        info.optionsAvailable = plugin->getAvailableOptions();
        info.optionsEnabled   = plugin->getOptions();

        plugin->getLabel(strBufLabel);
        info.label = carla_strdup(strBufLabel);

        plugin->getMaker(strBufMaker);
        info.maker = carla_strdup(strBufMaker);

        plugin->getCopyright(strBufCopyright);
        info.copyright = carla_strdup(strBufCopyright);

        return &info;
    }

    carla_stderr2("carla_get_plugin_info(%i) - could not find plugin", pluginId);
    return &info;
}

const CarlaPortCountInfo* carla_get_audio_port_count_info(unsigned int pluginId)
{
    carla_debug("carla_get_audio_port_count_info(%i)", pluginId);

    static CarlaPortCountInfo info;

    // reset
    info.ins   = 0;
    info.outs  = 0;
    info.total = 0;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &info);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        info.ins   = plugin->getAudioInCount();
        info.outs  = plugin->getAudioOutCount();
        info.total = info.ins + info.outs;
        return &info;
    }

    carla_stderr2("carla_get_audio_port_count_info(%i) - could not find plugin", pluginId);
    return &info;
}

const CarlaPortCountInfo* carla_get_midi_port_count_info(unsigned int pluginId)
{
    carla_debug("carla_get_midi_port_count_info(%i)", pluginId);

    static CarlaPortCountInfo info;

    // reset
    info.ins   = 0;
    info.outs  = 0;
    info.total = 0;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &info);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        info.ins   = plugin->getMidiInCount();
        info.outs  = plugin->getMidiOutCount();
        info.total = info.ins + info.outs;
        return &info;
    }

    carla_stderr2("carla_get_midi_port_count_info(%i) - could not find plugin", pluginId);
    return &info;
}

const CarlaPortCountInfo* carla_get_parameter_count_info(unsigned int pluginId)
{
    carla_debug("carla_get_parameter_count_info(%i)", pluginId);

    static CarlaPortCountInfo info;

    // reset
    info.ins   = 0;
    info.outs  = 0;
    info.total = 0;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &info);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        plugin->getParameterCountInfo(info.ins, info.outs, info.total);
        return &info;
    }

    carla_stderr2("carla_get_parameter_count_info(%i) - could not find plugin", pluginId);
    return &info;
}

const CarlaParameterInfo* carla_get_parameter_info(unsigned int pluginId, uint32_t parameterId)
{
    carla_debug("carla_get_parameter_info(%i, %i)", pluginId, parameterId);

    static CarlaParameterInfo info;

    // reset
    info.scalePointCount = 0;

    // cleanup
    if (info.name != nullptr)
    {
        delete[] info.name;
        info.name = nullptr;
    }

    if (info.symbol != nullptr)
    {
        delete[] info.symbol;
        info.symbol = nullptr;
    }

    if (info.unit != nullptr)
    {
        delete[] info.unit;
        info.unit = nullptr;
    }

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &info);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
        {
            char strBufName[STR_MAX+1];
            char strBufSymbol[STR_MAX+1];
            char strBufUnit[STR_MAX+1];

            carla_zeroChar(strBufName, STR_MAX+1);
            carla_zeroChar(strBufSymbol, STR_MAX+1);
            carla_zeroChar(strBufUnit, STR_MAX+1);

            info.scalePointCount = plugin->getParameterScalePointCount(parameterId);

            plugin->getParameterName(parameterId, strBufName);
            info.name = carla_strdup(strBufName);

            plugin->getParameterSymbol(parameterId, strBufSymbol);
            info.symbol = carla_strdup(strBufSymbol);

            plugin->getParameterUnit(parameterId, strBufUnit);
            info.unit = carla_strdup(strBufUnit);
        }
        else
            carla_stderr2("carla_get_parameter_info(%i, %i) - parameterId out of bounds", pluginId, parameterId);

        return &info;
    }

    carla_stderr2("carla_get_parameter_info(%i, %i) - could not find plugin", pluginId, parameterId);
    return &info;
}

const CarlaScalePointInfo* carla_get_parameter_scalepoint_info(unsigned int pluginId, uint32_t parameterId, uint32_t scalePointId)
{
    carla_debug("carla_get_parameter_scalepoint_info(%i, %i, %i)", pluginId, parameterId, scalePointId);
    CARLA_ASSERT(gStandalone.engine != nullptr);

    static CarlaScalePointInfo info;

    // reset
    info.value = 0.0f;

    // cleanup
    if (info.label != nullptr)
    {
        delete[] info.label;
        info.label = nullptr;
    }

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &info);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
        {
            if (scalePointId < plugin->getParameterScalePointCount(parameterId))
            {
                char strBufLabel[STR_MAX+1];
                carla_zeroChar(strBufLabel, STR_MAX+1);

                info.value = plugin->getParameterScalePointValue(parameterId, scalePointId);

                plugin->getParameterScalePointLabel(parameterId, scalePointId, strBufLabel);
                info.label = carla_strdup(strBufLabel);
            }
            else
                carla_stderr2("carla_get_parameter_scalepoint_info(%i, %i, %i) - scalePointId out of bounds", pluginId, parameterId, scalePointId);
        }
        else
            carla_stderr2("carla_get_parameter_scalepoint_info(%i, %i, %i) - parameterId out of bounds", pluginId, parameterId, scalePointId);

        return &info;
    }

    carla_stderr2("carla_get_parameter_scalepoint_info(%i, %i, %i) - could not find plugin", pluginId, parameterId, scalePointId);
    return &info;
}

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

const CarlaParameterData* carla_get_parameter_data(unsigned int pluginId, uint32_t parameterId)
{
    carla_debug("carla_get_parameter_data(%i, %i)", pluginId, parameterId);

    static CarlaParameterData fallbackParamData;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &fallbackParamData);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
            return &plugin->getParameterData(parameterId);

        carla_stderr2("carla_get_parameter_data(%i, %i) - parameterId out of bounds", pluginId, parameterId);
        return &fallbackParamData;
    }

    carla_stderr2("carla_get_parameter_data(%i, %i) - could not find plugin", pluginId, parameterId);
    return &fallbackParamData;
}

const CarlaParameterRanges* carla_get_parameter_ranges(unsigned int pluginId, uint32_t parameterId)
{
    carla_debug("carla_get_parameter_ranges(%i, %i)", pluginId, parameterId);

    static CarlaParameterRanges fallbackParamRanges;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &fallbackParamRanges);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
            return &plugin->getParameterRanges(parameterId);

        carla_stderr2("carla_get_parameter_ranges(%i, %i) - parameterId out of bounds", pluginId, parameterId);
        return &fallbackParamRanges;
    }

    carla_stderr2("carla_get_parameter_ranges(%i, %i) - could not find plugin", pluginId, parameterId);
    return &fallbackParamRanges;
}

const CarlaMidiProgramData* carla_get_midi_program_data(unsigned int pluginId, uint32_t midiProgramId)
{
    carla_debug("carla_get_midi_program_data(%i, %i)", pluginId, midiProgramId);

    static CarlaMidiProgramData fallbackMidiProgData;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &fallbackMidiProgData);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (midiProgramId < plugin->getMidiProgramCount())
            return &plugin->getMidiProgramData(midiProgramId);

        carla_stderr2("carla_get_midi_program_data(%i, %i) - midiProgramId out of bounds", pluginId, midiProgramId);
        return &fallbackMidiProgData;
    }

    carla_stderr2("carla_get_midi_program_data(%i, %i) - could not find plugin", pluginId, midiProgramId);
    return &fallbackMidiProgData;
}

const CarlaCustomData* carla_get_custom_data(unsigned int pluginId, uint32_t customDataId)
{
    carla_debug("carla_get_custom_data(%i, %i)", pluginId, customDataId);

    static CarlaCustomData fallbackCustomData;

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, &fallbackCustomData);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (customDataId < plugin->getCustomDataCount())
            return &plugin->getCustomData(customDataId);

        carla_stderr2("carla_get_custom_data(%i, %i) - customDataId out of bounds", pluginId, customDataId);
        return &fallbackCustomData;
    }

    carla_stderr2("carla_get_custom_data(%i, %i) - could not find plugin", pluginId, customDataId);
    return &fallbackCustomData;
}

const char* carla_get_chunk_data(unsigned int pluginId)
{
    carla_debug("carla_get_chunk_data(%i)", pluginId);

    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, nullptr);

    static CarlaString chunkData;

    // cleanup
    chunkData.clear();

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
#ifdef USE_JUCE
        if (plugin->getOptions() & CB::PLUGIN_OPTION_USE_CHUNKS)
        {
            void* data = nullptr;
            const int32_t dataSize(plugin->getChunkData(&data));

            if (data != nullptr && dataSize > 0)
            {
                juce::MemoryBlock memBlock(data, dataSize);
                chunkData = memBlock.toBase64Encoding().toRawUTF8();
                return (const char*)chunkData;
            }
            else
                carla_stderr2("carla_get_chunk_data(%i) - got invalid chunk data", pluginId);
        }
        else
            carla_stderr2("carla_get_chunk_data(%i) - plugin does not use chunks", pluginId);
#else
        carla_stderr2("carla_get_chunk_data(%i) - unsupported", pluginId);
#endif
        return nullptr;
    }

    carla_stderr2("carla_get_chunk_data(%i) - could not find plugin", pluginId);
    return nullptr;
}

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

uint32_t carla_get_parameter_count(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0);
    carla_debug("carla_get_parameter_count(%i)", pluginId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->getParameterCount();

    carla_stderr2("carla_get_parameter_count(%i) - could not find plugin", pluginId);
    return 0;
}

uint32_t carla_get_program_count(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0);
    carla_debug("carla_get_program_count(%i)", pluginId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->getProgramCount();

    carla_stderr2("carla_get_program_count(%i) - could not find plugin", pluginId);
    return 0;
}

uint32_t carla_get_midi_program_count(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0);
    carla_debug("carla_get_midi_program_count(%i)", pluginId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->getMidiProgramCount();

    carla_stderr2("carla_get_midi_program_count(%i) - could not find plugin", pluginId);
    return 0;
}

uint32_t carla_get_custom_data_count(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0);
    carla_debug("carla_get_custom_data_count(%i)", pluginId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->getCustomDataCount();

    carla_stderr2("carla_get_custom_data_count(%i) - could not find plugin", pluginId);
    return 0;
}

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

const char* carla_get_parameter_text(unsigned int pluginId, uint32_t parameterId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, nullptr);
    carla_debug("carla_get_parameter_text(%i, %i)", pluginId, parameterId);

    static char textBuf[STR_MAX+1];
    carla_zeroChar(textBuf, STR_MAX+1);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
        {
            plugin->getParameterText(parameterId, textBuf);
            return textBuf;
        }

        carla_stderr2("carla_get_parameter_text(%i, %i) - parameterId out of bounds", pluginId, parameterId);
        return nullptr;
    }

    carla_stderr2("carla_get_parameter_text(%i, %i) - could not find plugin", pluginId, parameterId);
    return nullptr;
}

const char* carla_get_program_name(unsigned int pluginId, uint32_t programId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, nullptr);
    carla_debug("carla_get_program_name(%i, %i)", pluginId, programId);

    static char programName[STR_MAX+1];
    carla_zeroChar(programName, STR_MAX+1);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (programId < plugin->getProgramCount())
        {
            plugin->getProgramName(programId, programName);
            return programName;
        }

        carla_stderr2("carla_get_program_name(%i, %i) - programId out of bounds", pluginId, programId);
        return nullptr;
    }

    carla_stderr2("carla_get_program_name(%i, %i) - could not find plugin", pluginId, programId);
    return nullptr;
}

const char* carla_get_midi_program_name(unsigned int pluginId, uint32_t midiProgramId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, nullptr);
    carla_debug("carla_get_midi_program_name(%i, %i)", pluginId, midiProgramId);

    static char midiProgramName[STR_MAX+1];
    carla_zeroChar(midiProgramName, STR_MAX+1);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (midiProgramId < plugin->getMidiProgramCount())
        {
            plugin->getMidiProgramName(midiProgramId, midiProgramName);
            return midiProgramName;
        }

        carla_stderr2("carla_get_midi_program_name(%i, %i) - midiProgramId out of bounds", pluginId, midiProgramId);
        return nullptr;
    }

    carla_stderr2("carla_get_midi_program_name(%i, %i) - could not find plugin", pluginId, midiProgramId);
    return nullptr;
}

const char* carla_get_real_plugin_name(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, nullptr);
    carla_debug("carla_get_real_plugin_name(%i)", pluginId);

    static char realPluginName[STR_MAX+1];
    carla_zeroChar(realPluginName, STR_MAX+1);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        plugin->getRealName(realPluginName);
        return realPluginName;
    }

    carla_stderr2("carla_get_real_plugin_name(%i) - could not find plugin", pluginId);
    return nullptr;
}

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

int32_t carla_get_current_program_index(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, -1);
    carla_debug("carla_get_current_program_index(%i)", pluginId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->getCurrentProgram();

    carla_stderr2("carla_get_current_program_index(%i) - could not find plugin", pluginId);
    return -1;
}

int32_t carla_get_current_midi_program_index(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, -1);
    carla_debug("carla_get_current_midi_program_index(%i)", pluginId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->getCurrentMidiProgram();

    carla_stderr2("carla_get_current_midi_program_index(%i) - could not find plugin", pluginId);
    return -1;
}

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

float carla_get_default_parameter_value(unsigned int pluginId, uint32_t parameterId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0.0f);
    carla_debug("carla_get_default_parameter_value(%i, %i)", pluginId, parameterId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
            return plugin->getParameterRanges(parameterId).def;

        carla_stderr2("carla_get_default_parameter_value(%i, %i) - parameterId out of bounds", pluginId, parameterId);
        return 0.0f;
    }

    carla_stderr2("carla_get_default_parameter_value(%i, %i) - could not find plugin", pluginId, parameterId);
    return 0.0f;
}

float carla_get_current_parameter_value(unsigned int pluginId, uint32_t parameterId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0.0f);
    carla_debug("carla_get_current_parameter_value(%i, %i)", pluginId, parameterId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
            return plugin->getParameterValue(parameterId);

        carla_stderr2("carla_get_current_parameter_value(%i, %i) - parameterId out of bounds", pluginId, parameterId);
        return 0.0f;
    }

    carla_stderr2("carla_get_current_parameter_value(%i, %i) - could not find plugin", pluginId, parameterId);
    return 0.0f;
}

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

float carla_get_input_peak_value(unsigned int pluginId, unsigned short portId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0.0f);
    CARLA_SAFE_ASSERT_RETURN(portId == 1 || portId == 2, 0.0f);

    return gStandalone.engine->getInputPeak(pluginId, portId);
}

float carla_get_output_peak_value(unsigned int pluginId, unsigned short portId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0.0f);
    CARLA_SAFE_ASSERT_RETURN(portId == 1 || portId == 2, 0.0f);

    return gStandalone.engine->getOutputPeak(pluginId, portId);
}

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

void carla_set_option(unsigned int pluginId, unsigned int option, bool yesNo)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_option(%i, %i, %s)", pluginId, option, bool2str(yesNo));

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setOption(option, yesNo);

    carla_stderr2("carla_set_option(%i, %i, %s) - could not find plugin", pluginId, option, bool2str(yesNo));
}

void carla_set_active(unsigned int pluginId, bool onOff)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_active(%i, %s)", pluginId, bool2str(onOff));

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setActive(onOff, true, false);

    carla_stderr2("carla_set_active(%i, %s) - could not find plugin", pluginId, bool2str(onOff));
}

#ifndef BUILD_BRIDGE
void carla_set_drywet(unsigned int pluginId, float value)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_drywet(%i, %f)", pluginId, value);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setDryWet(value, true, false);

    carla_stderr2("carla_set_drywet(%i, %f) - could not find plugin", pluginId, value);
}

void carla_set_volume(unsigned int pluginId, float value)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_volume(%i, %f)", pluginId, value);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setVolume(value, true, false);

    carla_stderr2("carla_set_volume(%i, %f) - could not find plugin", pluginId, value);
}

void carla_set_balance_left(unsigned int pluginId, float value)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_balance_left(%i, %f)", pluginId, value);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setBalanceLeft(value, true, false);

    carla_stderr2("carla_set_balance_left(%i, %f) - could not find plugin", pluginId, value);
}

void carla_set_balance_right(unsigned int pluginId, float value)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_balance_right(%i, %f)", pluginId, value);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setBalanceRight(value, true, false);

    carla_stderr2("carla_set_balance_right(%i, %f) - could not find plugin", pluginId, value);
}

void carla_set_panning(unsigned int pluginId, float value)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_panning(%i, %f)", pluginId, value);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setPanning(value, true, false);

    carla_stderr2("carla_set_panning(%i, %f) - could not find plugin", pluginId, value);
}
#endif

void carla_set_ctrl_channel(unsigned int pluginId, int8_t channel)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_ctrl_channel(%i, %i)", pluginId, channel);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setCtrlChannel(channel, true, false);

    carla_stderr2("carla_set_ctrl_channel(%i, %i) - could not find plugin", pluginId, channel);
}

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

void carla_set_parameter_value(unsigned int pluginId, uint32_t parameterId, float value)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_parameter_value(%i, %i, %f)", pluginId, parameterId, value);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
            return plugin->setParameterValue(parameterId, value, true, true, false);

        carla_stderr2("carla_set_parameter_value(%i, %i, %f) - parameterId out of bounds", pluginId, parameterId, value);
        return;
    }

    carla_stderr2("carla_set_parameter_value(%i, %i, %f) - could not find plugin", pluginId, parameterId, value);
}

#ifndef BUILD_BRIDGE
void carla_set_parameter_midi_channel(unsigned int pluginId, uint32_t parameterId, uint8_t channel)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    CARLA_SAFE_ASSERT_RETURN(channel >= MAX_MIDI_CHANNELS,);
    carla_debug("carla_set_parameter_midi_channel(%i, %i, %i)", pluginId, parameterId, channel);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
            return plugin->setParameterMidiChannel(parameterId, channel, true, false);

        carla_stderr2("carla_set_parameter_midi_channel(%i, %i, %i) - parameterId out of bounds", pluginId, parameterId, channel);
        return;
    }

    carla_stderr2("carla_set_parameter_midi_channel(%i, %i, %i) - could not find plugin", pluginId, parameterId, channel);
}

void carla_set_parameter_midi_cc(unsigned int pluginId, uint32_t parameterId, int16_t cc)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    CARLA_SAFE_ASSERT_RETURN(cc >= -1 && cc <= 0x5F,);
    carla_debug("carla_set_parameter_midi_cc(%i, %i, %i)", pluginId, parameterId, cc);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (parameterId < plugin->getParameterCount())
            return plugin->setParameterMidiCC(parameterId, cc, true, false);

        carla_stderr2("carla_set_parameter_midi_cc(%i, %i, %i) - parameterId out of bounds", pluginId, parameterId, cc);
        return;
    }

    carla_stderr2("carla_set_parameter_midi_cc(%i, %i, %i) - could not find plugin", pluginId, parameterId, cc);
}
#endif

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

void carla_set_program(unsigned int pluginId, uint32_t programId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_program(%i, %i)", pluginId, programId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (programId < plugin->getProgramCount())
            return plugin->setProgram(static_cast<int32_t>(programId), true, true, false);

        carla_stderr2("carla_set_program(%i, %i) - programId out of bounds", pluginId, programId);
        return;
    }

    carla_stderr2("carla_set_program(%i, %i) - could not find plugin", pluginId, programId);
}

void carla_set_midi_program(unsigned int pluginId, uint32_t midiProgramId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_set_midi_program(%i, %i)", pluginId, midiProgramId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (midiProgramId < plugin->getMidiProgramCount())
            return plugin->setMidiProgram(static_cast<int32_t>(midiProgramId), true, true, false);

        carla_stderr2("carla_set_midi_program(%i, %i) - midiProgramId out of bounds", pluginId, midiProgramId);
        return;
    }

    carla_stderr2("carla_set_midi_program(%i, %i) - could not find plugin", pluginId, midiProgramId);
}

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

void carla_set_custom_data(unsigned int pluginId, const char* type, const char* key, const char* value)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    CARLA_SAFE_ASSERT_RETURN(type != nullptr && type[0] != '\0',);
    CARLA_SAFE_ASSERT_RETURN(key != nullptr && key[0] != '\0',);
    CARLA_SAFE_ASSERT_RETURN(value != nullptr,);
    carla_debug("carla_set_custom_data(%i, \"%s\", \"%s\", \"%s\")", pluginId, type, key, value);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->setCustomData(type, key, value, true);

    carla_stderr2("carla_set_custom_data(%i, \"%s\", \"%s\", \"%s\") - could not find plugin", pluginId, type, key, value);
}

void carla_set_chunk_data(unsigned int pluginId, const char* chunkData)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    CARLA_SAFE_ASSERT_RETURN(chunkData != nullptr && chunkData[0] != '\0',);
    carla_debug("carla_set_chunk_data(%i, \"%s\")", pluginId, chunkData);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
    {
        if (plugin->getOptions() & CB::PLUGIN_OPTION_USE_CHUNKS)
            return plugin->setChunkData(chunkData);

        carla_stderr2("carla_set_chunk_data(%i, \"%s\") - plugin does not use chunks", pluginId, chunkData);
        return;
    }

    carla_stderr2("carla_set_chunk_data(%i, \"%s\") - could not find plugin", pluginId, chunkData);
}

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

void carla_prepare_for_save(unsigned int pluginId)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_prepare_for_save(%i)", pluginId);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->prepareForSave();

    carla_stderr2("carla_prepare_for_save(%i) - could not find plugin", pluginId);
}

#ifndef BUILD_BRIDGE
void carla_send_midi_note(unsigned int pluginId, uint8_t channel, uint8_t note, uint8_t velocity)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr && gStandalone.engine->isRunning(),);
    carla_debug("carla_send_midi_note(%i, %i, %i, %i)", pluginId, channel, note, velocity);

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->sendMidiSingleNote(channel, note, velocity, true, true, false);

    carla_stderr2("carla_send_midi_note(%i, %i, %i, %i) - could not find plugin", pluginId, channel, note, velocity);
}
#endif

void carla_show_gui(unsigned int pluginId, bool yesno)
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr,);
    carla_debug("carla_show_gui(%i, %s)", pluginId, bool2str(yesno));

    if (CarlaPlugin* const plugin = gStandalone.engine->getPlugin(pluginId))
        return plugin->showGui(yesno);

    carla_stderr2("carla_show_gui(%i, %s) - could not find plugin", pluginId, bool2str(yesno));
}

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

uint32_t carla_get_buffer_size()
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0);
    carla_debug("carla_get_buffer_size()");

    return gStandalone.engine->getBufferSize();
}

double carla_get_sample_rate()
{
    CARLA_SAFE_ASSERT_RETURN(gStandalone.engine != nullptr, 0.0);
    carla_debug("carla_get_sample_rate()");

    return gStandalone.engine->getSampleRate();
}

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

const char* carla_get_last_error()
{
    carla_debug("carla_get_last_error()");

    if (gStandalone.engine != nullptr)
        return gStandalone.engine->getLastError();

    return gStandalone.lastError;
}

const char* carla_get_host_osc_url_tcp()
{
    carla_debug("carla_get_host_osc_url_tcp()");

    if (gStandalone.engine == nullptr)
    {
        carla_stderr2("Engine is not running");
        gStandalone.lastError = "Engine is not running";
        return nullptr;
    }

    return gStandalone.engine->getOscServerPathTCP();
}

const char* carla_get_host_osc_url_udp()
{
    carla_debug("carla_get_host_osc_url_udp()");

    if (gStandalone.engine == nullptr)
    {
        carla_stderr2("Engine is not running");
        gStandalone.lastError = "Engine is not running";
        return nullptr;
    }

    return gStandalone.engine->getOscServerPathUDP();
}

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

#define NSM_API_VERSION_MAJOR 1
#define NSM_API_VERSION_MINOR 2

class CarlaNSM
{
public:
    CarlaNSM()
        : fServerThread(nullptr),
          fReplyAddr(nullptr),
          fIsReady(false),
          fIsOpened(false),
          fIsSaved(false)
    {
    }

    ~CarlaNSM()
    {
        if (fReplyAddr != nullptr)
            lo_address_free(fReplyAddr);

        if (fServerThread != nullptr)
        {
            lo_server_thread_stop(fServerThread);
            lo_server_thread_del_method(fServerThread, "/reply", "ssss");
            lo_server_thread_del_method(fServerThread, "/nsm/client/open", "sss");
            lo_server_thread_del_method(fServerThread, "/nsm/client/save", "");
            lo_server_thread_free(fServerThread);
        }
    }

    void announce(const char* const url, const char* appName, const int pid)
    {
        lo_address const addr = lo_address_new_from_url(url);

        if (addr == nullptr)
            return;

        const int proto = lo_address_get_protocol(addr);

        if (fServerThread == nullptr)
        {
            // create new OSC thread
            fServerThread = lo_server_thread_new_with_proto(nullptr, proto, error_handler);

            // register message handlers and start OSC thread
            lo_server_thread_add_method(fServerThread, "/reply",           "ssss", _reply_handler, this);
            lo_server_thread_add_method(fServerThread, "/nsm/client/open", "sss",  _open_handler,  this);
            lo_server_thread_add_method(fServerThread, "/nsm/client/save", "",     _save_handler,  this);
            lo_server_thread_start(fServerThread);
        }

#ifndef BUILD_ANSI_TEST
        lo_send_from(addr, lo_server_thread_get_server(fServerThread), LO_TT_IMMEDIATE, "/nsm/server/announce", "sssiii",
                     "Carla", ":switch:", appName, NSM_API_VERSION_MAJOR, NSM_API_VERSION_MINOR, pid);
#endif

        lo_address_free(addr);
    }

    void ready()
    {
        fIsReady = true;
    }

    void replyOpen()
    {
        fIsOpened = true;
    }

    void replySave()
    {
        fIsSaved = true;
    }

protected:
    int handleReply(const char* const path, const char* const types, lo_arg** const argv, const int argc, const lo_message msg)
    {
        carla_debug("CarlaNSM::handleReply(%s, %i, %p, %s, %p)", path, argc, argv, types, msg);

        if (fReplyAddr != nullptr)
            lo_address_free(fReplyAddr);

        fIsOpened = false;
        fIsSaved  = false;

        char* const url = lo_address_get_url(lo_message_get_source(msg));
        fReplyAddr      = lo_address_new_from_url(url);
        std::free(url);

        const char* const method = &argv[0]->s;
        const char* const smName = &argv[2]->s;

        // wait max 6 secs for host to init
        for (int i=0; i < 60 && ! fIsReady; ++i)
            carla_msleep(100);

        if (std::strcmp(method, "/nsm/server/announce") == 0 && gStandalone.callback != nullptr)
            gStandalone.callback(gStandalone.callbackPtr, CB::ENGINE_CALLBACK_NSM_ANNOUNCE, 0, 0, 0, 0.0f, smName);

        return 0;

#ifndef DEBUG
        // unused
        (void)path;
        (void)types;
        (void)argc;
#endif
    }

    int handleOpen(const char* const path, const char* const types, lo_arg** const argv, const int argc, const lo_message msg)
    {
        carla_debug("CarlaNSM::handleOpen(\"%s\", \"%s\", %p, %i, %p)", path, types, argv, argc, msg);

        if (gStandalone.callback == nullptr)
            return 1;
        if (fServerThread == nullptr)
            return 1;
        if (fReplyAddr == nullptr)
            return 1;

        const char* const projectPath = &argv[0]->s;
        const char* const clientId    = &argv[2]->s;

        char data[std::strlen(projectPath)+std::strlen(clientId)+2];
        std::strcpy(data, projectPath);
        std::strcat(data, ":");
        std::strcat(data, clientId);

        fIsOpened = false;

        gStandalone.callback(nullptr, CB::ENGINE_CALLBACK_NSM_OPEN, 0, 0, 0, 0.0f, data);

        // wait max 10 secs to open
        for (int i=0; i < 100 && ! fIsOpened; ++i)
            carla_msleep(100);

#ifndef BUILD_ANSI_TEST
        if (fIsOpened)
            lo_send_from(fReplyAddr, lo_server_thread_get_server(fServerThread), LO_TT_IMMEDIATE, "/reply", "ss", "/nsm/client/open", "OK");
#endif

        return 0;

#ifndef DEBUG
        // unused
        (void)path;
        (void)types;
        (void)argc;
        (void)msg;
#endif
    }

    int handleSave(const char* const path, const char* const types, lo_arg** const argv, const int argc, const lo_message msg)
    {
        carla_debug("CarlaNSM::handleSave(\"%s\", \"%s\", %p, %i, %p)", path, types, argv, argc, msg);

        if (gStandalone.callback == nullptr)
            return 1;
        if (fServerThread == nullptr)
            return 1;
        if (fReplyAddr == nullptr)
            return 1;

        fIsSaved = false;

        gStandalone.callback(nullptr, CB::ENGINE_CALLBACK_NSM_SAVE, 0, 0, 0, 0.0f, nullptr);

        // wait max 10 secs to save
        for (int i=0; i < 100 && ! fIsSaved; ++i)
            carla_msleep(100);

#ifndef BUILD_ANSI_TEST
        if (fIsSaved)
            lo_send_from(fReplyAddr, lo_server_thread_get_server(fServerThread), LO_TT_IMMEDIATE, "/reply", "ss", "/nsm/client/save", "OK");
#endif

        return 0;

#ifndef DEBUG
        // unused
        (void)path;
        (void)types;
        (void)argv;
        (void)argc;
        (void)msg;
#endif
    }

private:
    lo_server_thread fServerThread;
    lo_address       fReplyAddr;

    bool fIsReady; // used to startup, only once
    bool fIsOpened;
    bool fIsSaved;

    #define handlePtr ((CarlaNSM*)data)

    static int _reply_handler(const char* path, const char* types, lo_arg** argv, int argc, lo_message msg, void* data)
    {
        return handlePtr->handleReply(path, types, argv, argc, msg);
    }

    static int _open_handler(const char* path, const char* types, lo_arg** argv, int argc, lo_message msg, void* data)
    {
        return handlePtr->handleOpen(path, types, argv, argc, msg);
    }

    static int _save_handler(const char* path, const char* types, lo_arg** argv, int argc, lo_message msg, void* data)
    {
        return handlePtr->handleSave(path, types, argv, argc, msg);
    }

    #undef handlePtr

    static void error_handler(int num, const char* msg, const char* path)
    {
        carla_stderr2("CarlaNSM::error_handler(%i, \"%s\", \"%s\")", num, msg, path);
    }
};

static CarlaNSM gCarlaNSM;

void carla_nsm_announce(const char* url, const char* appName, int pid)
{
    CARLA_SAFE_ASSERT_RETURN(url != nullptr && url[0] != '\0',);
    CARLA_SAFE_ASSERT_RETURN(appName != nullptr && appName[0] != '\0',);
    CARLA_SAFE_ASSERT_RETURN(pid != 0,);
    carla_debug("carla_nsm_announce(\"%s\", \"%s\", %i)", url, appName, pid);

    gCarlaNSM.announce(url, appName, pid);
}

void carla_nsm_ready()
{
    carla_debug("carla_nsm_ready()");

    gCarlaNSM.ready();
}

void carla_nsm_reply_open()
{
    carla_debug("carla_nsm_reply_open()");

    gCarlaNSM.replyOpen();
}

void carla_nsm_reply_save()
{
    carla_debug("carla_nsm_reply_save()");

    gCarlaNSM.replySave();
}

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

#ifdef BUILD_BRIDGE
CarlaEngine* carla_get_standalone_engine()
{
    return gStandalone.engine;
}
#endif