JUCE/extras/audio plugins/wrapper/VST/juce_VST_Wrapper.cpp

/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-10 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE 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.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#ifdef _MSC_VER
  #pragma warning (disable : 4996 4100)
#endif

#ifdef _WIN32
  #include <windows.h>
#elif defined (LINUX)
  #include <X11/Xlib.h>
  #include <X11/Xutil.h>
  #include <X11/Xatom.h>
  #undef KeyPress
#else
  #include <Carbon/Carbon.h>
#endif

#ifdef PRAGMA_ALIGN_SUPPORTED
  #undef PRAGMA_ALIGN_SUPPORTED
  #define PRAGMA_ALIGN_SUPPORTED 1
#endif

#include "../juce_IncludeCharacteristics.h"

#if JucePlugin_Build_VST

//==============================================================================
/*  These files come with the Steinberg VST SDK - to get them, you'll need to
    visit the Steinberg website and jump through some hoops to sign up as a
    VST developer.

    Then, you'll need to make sure your include path contains your "vstsdk2.3" or
    "vstsdk2.4" directory.

    Note that the JUCE_USE_VSTSDK_2_4 macro should be defined in JucePluginCharacteristics.h
*/
#if JUCE_USE_VSTSDK_2_4
 #ifdef __GNUC__
  #define __cdecl
 #endif

 // VSTSDK V2.4 includes..
 #include "public.sdk/source/vst2.x/audioeffectx.h"
 #include "public.sdk/source/vst2.x/aeffeditor.h"
 #include "public.sdk/source/vst2.x/audioeffectx.cpp"
 #include "public.sdk/source/vst2.x/audioeffect.cpp"

 #if ! VST_2_4_EXTENSIONS
  #error // You're probably trying to include the wrong VSTSDK version - make sure your include path matches the JUCE_USE_VSTSDK_2_4 flag
 #endif

#else
 // VSTSDK V2.3 includes..
 #include "source/common/audioeffectx.h"
 #include "source/common/AEffEditor.hpp"
 #include "source/common/audioeffectx.cpp"
 #include "source/common/AudioEffect.cpp"

 #if (! VST_2_3_EXTENSIONS) || VST_2_4_EXTENSIONS
  #error // You're probably trying to include the wrong VSTSDK version - make sure your include path matches the JUCE_USE_VSTSDK_2_4 flag
 #endif

 #define __aeffect__  // (needed for juce_VSTMidiEventList.h to work)

 typedef long VstInt32;
 typedef long VstIntPtr;
 enum Vst2StringConstants
 {
   kVstMaxNameLen       = 64,
   kVstMaxLabelLen      = 64,
   kVstMaxShortLabelLen = 8,
   kVstMaxCategLabelLen = 24,
   kVstMaxFileNameLen   = 100
 };

 enum VstSmpteFrameRate
 {
    kVstSmpte24fps    = 0,  ///< 24 fps
    kVstSmpte25fps    = 1,  ///< 25 fps
    kVstSmpte2997fps  = 2,  ///< 29.97 fps
    kVstSmpte30fps    = 3,  ///< 30 fps
    kVstSmpte2997dfps = 4,  ///< 29.97 drop
    kVstSmpte30dfps   = 5,  ///< 30 drop
    kVstSmpteFilm16mm = 6,  ///< Film 16mm
    kVstSmpteFilm35mm = 7,  ///< Film 35mm
    kVstSmpte239fps   = 10, ///< HDTV: 23.976 fps
    kVstSmpte249fps   = 11, ///< HDTV: 24.976 fps
    kVstSmpte599fps   = 12, ///< HDTV: 59.94 fps
    kVstSmpte60fps    = 13  ///< HDTV: 60 fps
 };

 struct VstMidiSysexEvent
 {
    VstInt32 type;          ///< #kVstSysexType
    VstInt32 byteSize;      ///< sizeof (VstMidiSysexEvent)
    VstInt32 deltaFrames;   ///< sample frames related to the current block start sample position
    VstInt32 flags;         ///< none defined yet (should be zero)
    VstInt32 dumpBytes;     ///< byte size of sysexDump
    VstIntPtr resvd1;       ///< zero (Reserved for future use)
    char* sysexDump;        ///< sysex dump
    VstIntPtr resvd2;       ///< zero (Reserved for future use)
 };

 typedef int VstSpeakerArrangementType;
#endif

//==============================================================================
#ifdef _MSC_VER
  #pragma pack (push, 8)
#endif

#include "../juce_PluginHeaders.h"
#include "../juce_PluginHostType.h"


#ifdef _MSC_VER
  #pragma pack (pop)
#endif

#undef MemoryBlock

class JuceVSTWrapper;
static bool recursionCheck = false;
static JUCE_NAMESPACE::uint32 lastMasterIdleCall = 0;

BEGIN_JUCE_NAMESPACE
 extern void juce_callAnyTimersSynchronously();

 #if JUCE_MAC
  extern void initialiseMac();
  extern void* attachComponentToWindowRef (Component* component, void* windowRef);
  extern void detachComponentFromWindowRef (Component* component, void* nsWindow);
  extern void setNativeHostWindowSize (void* nsWindow, Component* editorComp, int newWidth, int newHeight, const PluginHostType& host);
  extern void checkWindowVisibility (void* nsWindow, Component* component);
  extern void forwardCurrentKeyEventToHost (Component* component);
 #endif

 #if JUCE_LINUX
  extern Display* display;
 #endif
END_JUCE_NAMESPACE


//==============================================================================
#if JUCE_WINDOWS

static HWND findMDIParentOf (HWND w)
{
    const int frameThickness = GetSystemMetrics (SM_CYFIXEDFRAME);

    while (w != 0)
    {
        HWND parent = GetParent (w);

        if (parent == 0)
            break;

        TCHAR windowType [32];
        zeromem (windowType, sizeof (windowType));
        GetClassName (parent, windowType, 31);

        if (String (windowType).equalsIgnoreCase ("MDIClient"))
        {
            w = parent;
            break;
        }

        RECT windowPos;
        GetWindowRect (w, &windowPos);

        RECT parentPos;
        GetWindowRect (parent, &parentPos);

        const int dw = (parentPos.right - parentPos.left) - (windowPos.right - windowPos.left);
        const int dh = (parentPos.bottom - parentPos.top) - (windowPos.bottom - windowPos.top);

        if (dw > 100 || dh > 100)
            break;

        w = parent;

        if (dw == 2 * frameThickness)
            break;
    }

    return w;
}

//==============================================================================
#elif JUCE_LINUX

class SharedMessageThread : public Thread
{
public:
    SharedMessageThread()
      : Thread ("VstMessageThread"),
        initialised (false)
    {
        startThread (7);

        while (! initialised)
            sleep (1);
    }

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

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

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

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

    juce_DeclareSingleton (SharedMessageThread, false)

private:
    bool initialised;
};

juce_ImplementSingleton (SharedMessageThread)

#endif

static Array<void*> activePlugins;

//==============================================================================
/**
    This wraps an AudioProcessor as an AudioEffectX...
*/
class JuceVSTWrapper  : public AudioEffectX,
                        private Timer,
                        public AudioProcessorListener,
                        public AudioPlayHead
{
public:
    //==============================================================================
    JuceVSTWrapper (audioMasterCallback audioMaster,
                    AudioProcessor* const filter_)
       : AudioEffectX (audioMaster,
                       filter_->getNumPrograms(),
                       filter_->getNumParameters()),
         filter (filter_)
    {
        chunkMemoryTime = 0;
        isProcessing = false;
        hasShutdown = false;
        firstProcessCallback = true;
        shouldDeleteEditor = false;
        speakerIn = kSpeakerArrEmpty;
        speakerOut = kSpeakerArrEmpty;
        numInChans = JucePlugin_MaxNumInputChannels;
        numOutChans = JucePlugin_MaxNumOutputChannels;

#if JUCE_MAC || JUCE_LINUX
        hostWindow = 0;
#endif

        filter->setPlayConfigDetails (numInChans, numOutChans, 0, 0);

        filter_->setPlayHead (this);
        filter_->addListener (this);

        cEffect.flags |= effFlagsHasEditor;
        cEffect.version = (long) (JucePlugin_VersionCode);

        setUniqueID ((int) (JucePlugin_VSTUniqueID));

#if JucePlugin_WantsMidiInput && ! JUCE_USE_VSTSDK_2_4
        wantEvents();
#endif

        setNumInputs (numInChans);
        setNumOutputs (numOutChans);

        canProcessReplacing (true);

#if ! JUCE_USE_VSTSDK_2_4
        hasVu (false);
        hasClip (false);
#endif

        isSynth ((JucePlugin_IsSynth) != 0);
        noTail (((JucePlugin_SilenceInProducesSilenceOut) != 0) && (JucePlugin_TailLengthSeconds <= 0));
        setInitialDelay (filter->getLatencySamples());
        programsAreChunks (true);

        activePlugins.add (this);
    }

    ~JuceVSTWrapper()
    {
        JUCE_AUTORELEASEPOOL

        stopTimer();
        deleteEditor (false);

        hasShutdown = true;

        delete filter;
        filter = 0;

        jassert (editorComp == 0);

        channels.free();
        deleteTempChannels();

        jassert (activePlugins.contains (this));
        activePlugins.removeValue (this);

        if (activePlugins.size() == 0)
        {
#if JUCE_LINUX
            SharedMessageThread::deleteInstance();
#endif
            shutdownJuce_GUI();
        }
    }

    void open()
    {
        JUCE_AUTORELEASEPOOL
        if (editorComp == 0)
        {
            checkWhetherWavelabHasChangedThread();
            const MessageManagerLock mmLock;

            AudioProcessorEditor* const ed = filter->createEditorIfNeeded();

            if (ed != 0)
                cEffect.flags |= effFlagsHasEditor;
            else
                cEffect.flags &= ~effFlagsHasEditor;

            filter->editorBeingDeleted (ed);
            delete ed;
        }

        startTimer (1000 / 4);
    }

    void close()
    {
        JUCE_AUTORELEASEPOOL
        const NonWavelabMMLock mmLock;
        jassert (! recursionCheck);

        stopTimer();
        deleteEditor (false);
    }

    //==============================================================================
    bool getEffectName (char* name)
    {
        String (JucePlugin_Name).copyToCString (name, 64);
        return true;
    }

    bool getVendorString (char* text)
    {
        String (JucePlugin_Manufacturer).copyToCString (text, 64);
        return true;
    }

    bool getProductString (char* text)
    {
        return getEffectName (text);
    }

    VstInt32 getVendorVersion()
    {
        return JucePlugin_VersionCode;
    }

    VstPlugCategory getPlugCategory()
    {
        return JucePlugin_VSTCategory;
    }

    VstInt32 canDo (char* text)
    {
        VstInt32 result = 0;

        if (strcmp (text, "receiveVstEvents") == 0
            || strcmp (text, "receiveVstMidiEvent") == 0
            || strcmp (text, "receiveVstMidiEvents") == 0)
        {
#if JucePlugin_WantsMidiInput
            result = 1;
#else
            result = -1;
#endif
        }
        else if (strcmp (text, "sendVstEvents") == 0
                 || strcmp (text, "sendVstMidiEvent") == 0
                 || strcmp (text, "sendVstMidiEvents") == 0)
        {
#if JucePlugin_ProducesMidiOutput
            result = 1;
#else
            result = -1;
#endif
        }
        else if (strcmp (text, "receiveVstTimeInfo") == 0
                 || strcmp (text, "conformsToWindowRules") == 0)
        {
            result = 1;
        }
        else if (strcmp (text, "openCloseAnyThread" == 0)
        {
            result = -1;
        }

        return result;
    }

    bool keysRequired()
    {
        return (JucePlugin_EditorRequiresKeyboardFocus) != 0;
    }

    bool getInputProperties (VstInt32 index, VstPinProperties* properties)
    {
        if (filter == 0 || index >= JucePlugin_MaxNumInputChannels)
            return false;

        const String name (filter->getInputChannelName ((int) index));

        name.copyToCString (properties->label, kVstMaxLabelLen - 1);
        name.copyToCString (properties->shortLabel, kVstMaxShortLabelLen - 1);

        if (speakerIn != kSpeakerArrEmpty)
        {
            properties->flags = kVstPinUseSpeaker;
            properties->arrangementType = speakerIn;
        }
        else
        {
            properties->flags = kVstPinIsActive;

            if (filter->isInputChannelStereoPair ((int) index))
                properties->flags |= kVstPinIsStereo;

            properties->arrangementType = 0;
        }

        return true;
    }

    bool getOutputProperties (VstInt32 index, VstPinProperties* properties)
    {
        if (filter == 0 || index >= JucePlugin_MaxNumOutputChannels)
            return false;

        const String name (filter->getOutputChannelName ((int) index));

        name.copyToCString (properties->label, kVstMaxLabelLen - 1);
        name.copyToCString (properties->shortLabel, kVstMaxShortLabelLen - 1);

        if (speakerOut != kSpeakerArrEmpty)
        {
            properties->flags = kVstPinUseSpeaker;
            properties->arrangementType = speakerOut;
        }
        else
        {
            properties->flags = kVstPinIsActive;

            if (filter->isOutputChannelStereoPair ((int) index))
                properties->flags |= kVstPinIsStereo;

            properties->arrangementType = 0;
        }

        return true;
    }

    //==============================================================================
    VstInt32 processEvents (VstEvents* events)
    {
#if JucePlugin_WantsMidiInput
        VSTMidiEventList::addEventsToMidiBuffer (events, midiEvents);
        return 1;
#else
        return 0;
#endif
    }

    void process (float** inputs, float** outputs, VstInt32 numSamples)
    {
        const int numIn = numInChans;
        const int numOut = numOutChans;

        AudioSampleBuffer temp (numIn, numSamples);
        int i;
        for (i = numIn; --i >= 0;)
            memcpy (temp.getSampleData (i), outputs[i], sizeof (float) * numSamples);

        processReplacing (inputs, outputs, numSamples);

        AudioSampleBuffer dest (outputs, numOut, numSamples);

        for (i = jmin (numIn, numOut); --i >= 0;)
            dest.addFrom (i, 0, temp, i, 0, numSamples);
    }

    void processReplacing (float** inputs, float** outputs, VstInt32 numSamples)
    {
        if (firstProcessCallback)
        {
            firstProcessCallback = false;

            // if this fails, the host hasn't called resume() before processing
            jassert (isProcessing);

            // (tragically, some hosts actually need this, although it's stupid to have
            //  to do it here..)
            if (! isProcessing)
                resume();

            filter->setNonRealtime (getCurrentProcessLevel() == 4 /* kVstProcessLevelOffline */);

#if JUCE_WINDOWS
            if (GetThreadPriority (GetCurrentThread()) <= THREAD_PRIORITY_NORMAL
                  && GetThreadPriority (GetCurrentThread()) >= THREAD_PRIORITY_LOWEST)
                filter->setNonRealtime (true);
#endif
        }

#if JUCE_DEBUG && ! JucePlugin_ProducesMidiOutput
        const int numMidiEventsComingIn = midiEvents.getNumEvents();
#endif

        jassert (activePlugins.contains (this));

        {
            const ScopedLock sl (filter->getCallbackLock());

            const int numIn = numInChans;
            const int numOut = numOutChans;

            if (filter->isSuspended())
            {
                for (int i = 0; i < numOut; ++i)
                    zeromem (outputs[i], sizeof (float) * numSamples);
            }
            else
            {
                int i;
                for (i = 0; i < numOut; ++i)
                {
                    float* chan = tempChannels.getUnchecked(i);

                    if (chan == 0)
                    {
                        chan = outputs[i];

                        // if some output channels are disabled, some hosts supply the same buffer
                        // for multiple channels - this buggers up our method of copying the
                        // inputs over the outputs, so we need to create unique temp buffers in this case..
                        for (int j = i; --j >= 0;)
                        {
                            if (outputs[j] == chan)
                            {
                                chan = new float [blockSize * 2];
                                tempChannels.set (i, chan);
                                break;
                            }
                        }
                    }

                    if (i < numIn && chan != inputs[i])
                        memcpy (chan, inputs[i], sizeof (float) * numSamples);

                    channels[i] = chan;
                }

                for (; i < numIn; ++i)
                    channels[i] = inputs[i];

                AudioSampleBuffer chans (channels, jmax (numIn, numOut), numSamples);

                filter->processBlock (chans, midiEvents);
            }
        }

        if (! midiEvents.isEmpty())
        {
#if JucePlugin_ProducesMidiOutput
            const int numEvents = midiEvents.getNumEvents();

            outgoingEvents.ensureSize (numEvents);
            outgoingEvents.clear();

            const JUCE_NAMESPACE::uint8* midiEventData;
            int midiEventSize, midiEventPosition;
            MidiBuffer::Iterator i (midiEvents);

            while (i.getNextEvent (midiEventData, midiEventSize, midiEventPosition))
            {
                jassert (midiEventPosition >= 0 && midiEventPosition < numSamples);

                outgoingEvents.addEvent (midiEventData, midiEventSize, midiEventPosition);
            }

            sendVstEventsToHost (outgoingEvents.events);
#else
            /*  This assertion is caused when you've added some events to the
                midiMessages array in your processBlock() method, which usually means
                that you're trying to send them somewhere. But in this case they're
                getting thrown away.

                If your plugin does want to send midi messages, you'll need to set
                the JucePlugin_ProducesMidiOutput macro to 1 in your
                JucePluginCharacteristics.h file.

                If you don't want to produce any midi output, then you should clear the
                midiMessages array at the end of your processBlock() method, to
                indicate that you don't want any of the events to be passed through
                to the output.
            */
            jassert (midiEvents.getNumEvents() <= numMidiEventsComingIn);
#endif

            midiEvents.clear();
        }
    }

    //==============================================================================
    VstInt32 startProcess () { return 0; }
    VstInt32 stopProcess () { return 0;}

    void resume()
    {
        if (filter == 0)
            return;

        isProcessing = true;
        channels.calloc (numInChans + numOutChans);

        double rate = getSampleRate();
        jassert (rate > 0);
        if (rate <= 0.0)
            rate = 44100.0;

        const int blockSize = getBlockSize();
        jassert (blockSize > 0);

        firstProcessCallback = true;

        filter->setNonRealtime (getCurrentProcessLevel() == 4 /* kVstProcessLevelOffline */);

        filter->setPlayConfigDetails (numInChans, numOutChans,
                                      rate, blockSize);

        deleteTempChannels();

        filter->prepareToPlay (rate, blockSize);

        midiEvents.ensureSize (2048);
        midiEvents.clear();

        setInitialDelay (filter->getLatencySamples());

        AudioEffectX::resume();

#if JucePlugin_ProducesMidiOutput
        outgoingEvents.ensureSize (512);
#endif

#if JucePlugin_WantsMidiInput && ! JUCE_USE_VSTSDK_2_4
        wantEvents();
#endif
    }

    void suspend()
    {
        if (filter == 0)
            return;

        AudioEffectX::suspend();

        filter->releaseResources();
        outgoingEvents.freeEvents();

        isProcessing = false;
        channels.free();

        deleteTempChannels();
    }

    bool getCurrentPosition (AudioPlayHead::CurrentPositionInfo& info)
    {
        const VstTimeInfo* const ti = getTimeInfo (kVstPpqPosValid
                                                   | kVstTempoValid
                                                   | kVstBarsValid
                                                   //| kVstCyclePosValid
                                                   | kVstTimeSigValid
                                                   | kVstSmpteValid
                                                   | kVstClockValid);

        if (ti == 0 || ti->sampleRate <= 0)
            return false;

        if ((ti->flags & kVstTempoValid) != 0)
            info.bpm = ti->tempo;
        else
            info.bpm = 0.0;

        if ((ti->flags & kVstTimeSigValid) != 0)
        {
            info.timeSigNumerator = ti->timeSigNumerator;
            info.timeSigDenominator = ti->timeSigDenominator;
        }
        else
        {
            info.timeSigNumerator = 4;
            info.timeSigDenominator = 4;
        }

        info.timeInSeconds = ti->samplePos / ti->sampleRate;

        if ((ti->flags & kVstPpqPosValid) != 0)
            info.ppqPosition = ti->ppqPos;
        else
            info.ppqPosition = 0.0;

        if ((ti->flags & kVstBarsValid) != 0)
            info.ppqPositionOfLastBarStart = ti->barStartPos;
        else
            info.ppqPositionOfLastBarStart = 0.0;

        if ((ti->flags & kVstSmpteValid) != 0)
        {
            AudioPlayHead::FrameRateType rate = AudioPlayHead::fpsUnknown;
            double fps = 1.0;

            switch (ti->smpteFrameRate)
            {
            case kVstSmpte24fps:
                rate = AudioPlayHead::fps24;
                fps = 24.0;
                break;

            case kVstSmpte25fps:
                rate = AudioPlayHead::fps25;
                fps = 25.0;
                break;

            case kVstSmpte2997fps:
                rate = AudioPlayHead::fps2997;
                fps = 29.97;
                break;

            case kVstSmpte30fps:
                rate = AudioPlayHead::fps30;
                fps = 30.0;
                break;

            case kVstSmpte2997dfps:
                rate = AudioPlayHead::fps2997drop;
                fps = 29.97;
                break;

            case kVstSmpte30dfps:
                rate = AudioPlayHead::fps30drop;
                fps = 30.0;
                break;

            case kVstSmpteFilm16mm:
            case kVstSmpteFilm35mm:
                fps = 24.0;
                break;

            case kVstSmpte239fps:       fps = 23.976; break;
            case kVstSmpte249fps:       fps = 24.976; break;
            case kVstSmpte599fps:       fps = 59.94; break;
            case kVstSmpte60fps:        fps = 60; break;

            default:
                jassertfalse // unknown frame-rate..
            }

            info.frameRate = rate;
            info.editOriginTime = ti->smpteOffset / (80.0 * fps);
        }
        else
        {
            info.frameRate = AudioPlayHead::fpsUnknown;
            info.editOriginTime = 0;
        }

        info.isRecording = (ti->flags & kVstTransportRecording) != 0;
        info.isPlaying   = (ti->flags & kVstTransportPlaying) != 0 || info.isRecording;

        return true;
    }

    //==============================================================================
    VstInt32 getProgram()
    {
        return filter != 0 ? filter->getCurrentProgram() : 0;
    }

    void setProgram (VstInt32 program)
    {
        if (filter != 0)
            filter->setCurrentProgram (program);
    }

    void setProgramName (char* name)
    {
        if (filter != 0)
            filter->changeProgramName (filter->getCurrentProgram(), name);
    }

    void getProgramName (char* name)
    {
        if (filter != 0)
            filter->getProgramName (filter->getCurrentProgram()).copyToCString (name, 24);
    }

    bool getProgramNameIndexed (VstInt32 /*category*/, VstInt32 index, char* text)
    {
        if (filter != 0 && ((unsigned int) index) < (unsigned int) filter->getNumPrograms())
        {
            filter->getProgramName (index).copyToCString (text, 24);
            return true;
        }

        return false;
    }

    //==============================================================================
    float getParameter (VstInt32 index)
    {
        if (filter == 0)
            return 0.0f;

        jassert (((unsigned int) index) < (unsigned int) filter->getNumParameters());
        return filter->getParameter (index);
    }

    void setParameter (VstInt32 index, float value)
    {
        if (filter != 0)
        {
            jassert (((unsigned int) index) < (unsigned int) filter->getNumParameters());
            filter->setParameter (index, value);
        }
    }

    void getParameterDisplay (VstInt32 index, char* text)
    {
        if (filter != 0)
        {
            jassert (((unsigned int) index) < (unsigned int) filter->getNumParameters());
            filter->getParameterText (index).copyToCString (text, 24); // length should technically be kVstMaxParamStrLen, which is 8, but hosts will normally allow a bit more.
        }
    }

    void getParameterName (VstInt32 index, char* text)
    {
        if (filter != 0)
        {
            jassert (((unsigned int) index) < (unsigned int) filter->getNumParameters());
            filter->getParameterName (index).copyToCString (text, 16); // length should technically be kVstMaxParamStrLen, which is 8, but hosts will normally allow a bit more.
        }
    }

    void audioProcessorParameterChanged (AudioProcessor*, int index, float newValue)
    {
        setParameterAutomated (index, newValue);
    }

    void audioProcessorParameterChangeGestureBegin (AudioProcessor*, int index)
    {
        beginEdit (index);
    }

    void audioProcessorParameterChangeGestureEnd (AudioProcessor*, int index)
    {
        endEdit (index);
    }

    void audioProcessorChanged (AudioProcessor*)
    {
        updateDisplay();
    }

    bool canParameterBeAutomated (VstInt32 index)
    {
        return filter != 0 && filter->isParameterAutomatable ((int) index);
    }

    class ChannelConfigComparator
    {
    public:
        static int compareElements (const short* const first, const short* const second)
        {
            if (first[0] < second[0])
                return -1;
            else if (first[0] > second[0])
                return 1;
            else if (first[1] < second[1])
                return -1;
            else if (first[1] > second[1])
                return 1;

            return 0;
        }
    };

    bool setSpeakerArrangement (VstSpeakerArrangement* pluginInput,
                                VstSpeakerArrangement* pluginOutput)
    {
        short channelConfigs[][2] = { JucePlugin_PreferredChannelConfigurations };

        Array <short*> channelConfigsSorted;
        ChannelConfigComparator comp;

        for (int i = 0; i < numElementsInArray (channelConfigs); ++i)
            channelConfigsSorted.addSorted (comp, channelConfigs[i]);

        for (int i = channelConfigsSorted.size(); --i >= 0;)
        {
            const short* const config = channelConfigsSorted.getUnchecked(i);
            bool inCountMatches  = (config[0] == pluginInput->numChannels);
            bool outCountMatches = (config[1] == pluginOutput->numChannels);

            if (inCountMatches && outCountMatches)
            {
                speakerIn = (VstSpeakerArrangementType) pluginInput->type;
                speakerOut = (VstSpeakerArrangementType) pluginOutput->type;
                numInChans = pluginInput->numChannels;
                numOutChans = pluginOutput->numChannels;

                filter->setPlayConfigDetails (numInChans, numOutChans,
                                              filter->getSampleRate(),
                                              filter->getBlockSize());
                return true;
            }
        }

        return false;
    }

    //==============================================================================
    VstInt32 getChunk (void** data, bool onlyStoreCurrentProgramData)
    {
        if (filter == 0)
            return 0;

        chunkMemory.setSize (0);
        if (onlyStoreCurrentProgramData)
            filter->getCurrentProgramStateInformation (chunkMemory);
        else
            filter->getStateInformation (chunkMemory);

        *data = (void*) chunkMemory.getData();

        // because the chunk is only needed temporarily by the host (or at least you'd
        // hope so) we'll give it a while and then free it in the timer callback.
        chunkMemoryTime = JUCE_NAMESPACE::Time::getApproximateMillisecondCounter();

        return (VstInt32) chunkMemory.getSize();
    }

    VstInt32 setChunk (void* data, VstInt32 byteSize, bool onlyRestoreCurrentProgramData)
    {
        if (filter == 0)
            return 0;

        chunkMemory.setSize (0);
        chunkMemoryTime = 0;

        if (byteSize > 0 && data != 0)
        {
            if (onlyRestoreCurrentProgramData)
                filter->setCurrentProgramStateInformation (data, byteSize);
            else
                filter->setStateInformation (data, byteSize);
        }

        return 0;
    }

    void timerCallback()
    {
        if (shouldDeleteEditor)
        {
            shouldDeleteEditor = false;
            deleteEditor (true);
        }

        if (chunkMemoryTime > 0
             && chunkMemoryTime < JUCE_NAMESPACE::Time::getApproximateMillisecondCounter() - 2000
             && ! recursionCheck)
        {
            chunkMemoryTime = 0;
            chunkMemory.setSize (0);
        }

#if JUCE_MAC
        if (hostWindow != 0)
            checkWindowVisibility (hostWindow, editorComp);
#endif

        tryMasterIdle();
    }

    void tryMasterIdle()
    {
        if (Component::isMouseButtonDownAnywhere()
             && ! recursionCheck)
        {
            const JUCE_NAMESPACE::uint32 now = JUCE_NAMESPACE::Time::getMillisecondCounter();

            if (now > lastMasterIdleCall + 20 && editorComp != 0)
            {
                lastMasterIdleCall = now;

                recursionCheck = true;
                masterIdle();
                recursionCheck = false;
            }
        }
    }

    void doIdleCallback()
    {
        // (wavelab calls this on a separate thread and causes a deadlock)..
        if (MessageManager::getInstance()->isThisTheMessageThread()
             && ! recursionCheck)
        {
            recursionCheck = true;

            juce_callAnyTimersSynchronously();

            for (int i = ComponentPeer::getNumPeers(); --i >= 0;)
                ComponentPeer::getPeer (i)->performAnyPendingRepaintsNow();

            recursionCheck = false;
        }
    }

    void createEditorComp()
    {
        if (hasShutdown || filter == 0)
            return;

        if (editorComp == 0)
        {
            AudioProcessorEditor* const ed = filter->createEditorIfNeeded();

            if (ed != 0)
            {
                cEffect.flags |= effFlagsHasEditor;
                ed->setOpaque (true);
                ed->setVisible (true);

                editorComp = new EditorCompWrapper (*this, ed);
            }
            else
            {
                cEffect.flags &= ~effFlagsHasEditor;
            }
        }

        shouldDeleteEditor = false;
    }

    void deleteEditor (bool canDeleteLaterIfModal)
    {
        PopupMenu::dismissAllActiveMenus();

        jassert (! recursionCheck);
        recursionCheck = true;

        if (editorComp != 0)
        {
            Component* const modalComponent = Component::getCurrentlyModalComponent();
            if (modalComponent != 0)
            {
                modalComponent->exitModalState (0);

                if (canDeleteLaterIfModal)
                {
                    shouldDeleteEditor = true;
                    recursionCheck = false;
                    return;
                }
            }

#if JUCE_MAC
            if (hostWindow != 0)
            {
                detachComponentFromWindowRef (editorComp, hostWindow);
                hostWindow = 0;
            }
#endif

            filter->editorBeingDeleted (editorComp->getEditorComp());

            editorComp = 0;

            // there's some kind of component currently modal, but the host
            // is trying to delete our plugin. You should try to avoid this happening..
            jassert (Component::getCurrentlyModalComponent() == 0);
        }

#if JUCE_LINUX
        hostWindow = 0;
#endif

        recursionCheck = false;
    }

    VstIntPtr dispatcher (VstInt32 opCode, VstInt32 index, VstIntPtr value, void* ptr, float opt)
    {
        if (hasShutdown)
            return 0;

        if (opCode == effEditIdle)
        {
            doIdleCallback();
            return 0;
        }
        else if (opCode == effEditOpen)
        {
            checkWhetherWavelabHasChangedThread();
            const MessageManagerLock mmLock;
            jassert (! recursionCheck);

            deleteEditor (true);
            createEditorComp();

            if (editorComp != 0)
            {
                editorComp->setOpaque (true);
                editorComp->setVisible (false);

              #if JUCE_WINDOWS
                editorComp->addToDesktop (0, ptr);
                hostWindow = (HWND) ptr;
              #elif JUCE_LINUX
                editorComp->addToDesktop (0);
                hostWindow = (Window) ptr;
                Window editorWnd = (Window) editorComp->getWindowHandle();
                XReparentWindow (display, editorWnd, hostWindow, 0, 0);
              #else
                hostWindow = attachComponentToWindowRef (editorComp, (WindowRef) ptr);
              #endif
                editorComp->setVisible (true);

                return 1;
            }
        }
        else if (opCode == effEditClose)
        {
            checkWhetherWavelabHasChangedThread();
            const MessageManagerLock mmLock;
            deleteEditor (true);
            return 0;
        }
        else if (opCode == effEditGetRect)
        {
            checkWhetherWavelabHasChangedThread();
            const MessageManagerLock mmLock;
            createEditorComp();

            if (editorComp != 0)
            {
                editorSize.left = 0;
                editorSize.top = 0;
                editorSize.right = (VstInt16) editorComp->getWidth();
                editorSize.bottom = (VstInt16) editorComp->getHeight();

                *((ERect**) ptr) = &editorSize;

                return (VstIntPtr) (pointer_sized_int) &editorSize;
            }
            else
            {
                return 0;
            }
        }

        return AudioEffectX::dispatcher (opCode, index, value, ptr, opt);
    }

    void resizeHostWindow (int newWidth, int newHeight)
    {
        if (editorComp != 0)
        {
#if ! JUCE_LINUX // linux hosts shouldn't be trusted!
            if (! (canHostDo (const_cast <char*> ("sizeWindow")) && sizeWindow (newWidth, newHeight)))
#endif
            {
                // some hosts don't support the sizeWindow call, so do it manually..
#if JUCE_MAC
                setNativeHostWindowSize (hostWindow, editorComp, newWidth, newHeight, getHostType());
#elif JUCE_LINUX
                Window root;
                int x, y;
                unsigned int width, height, border, depth;

                XGetGeometry (display, hostWindow, &root,
                              &x, &y, &width, &height, &border, &depth);

                newWidth += (width + border) - editorComp->getWidth();
                newHeight += (height + border) - editorComp->getHeight();

                XResizeWindow (display, hostWindow, newWidth, newHeight);
#else
                int dw = 0;
                int dh = 0;
                const int frameThickness = GetSystemMetrics (SM_CYFIXEDFRAME);

                HWND w = (HWND) editorComp->getWindowHandle();

                while (w != 0)
                {
                    HWND parent = GetParent (w);

                    if (parent == 0)
                        break;

                    TCHAR windowType [32];
                    zeromem (windowType, sizeof (windowType));
                    GetClassName (parent, windowType, 31);

                    if (String (windowType).equalsIgnoreCase ("MDIClient"))
                        break;

                    RECT windowPos;
                    GetWindowRect (w, &windowPos);

                    RECT parentPos;
                    GetWindowRect (parent, &parentPos);

                    SetWindowPos (w, 0, 0, 0,
                                  newWidth + dw,
                                  newHeight + dh,
                                  SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOOWNERZORDER);

                    dw = (parentPos.right - parentPos.left) - (windowPos.right - windowPos.left);
                    dh = (parentPos.bottom - parentPos.top) - (windowPos.bottom - windowPos.top);

                    w = parent;

                    if (dw == 2 * frameThickness)
                        break;

                    if (dw > 100 || dh > 100)
                        w = 0;
                }

                if (w != 0)
                    SetWindowPos (w, 0, 0, 0,
                                  newWidth + dw,
                                  newHeight + dh,
                                  SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOOWNERZORDER);
#endif
            }

            if (editorComp->getPeer() != 0)
                editorComp->getPeer()->handleMovedOrResized();
        }
    }

    static PluginHostType& getHostType()
    {
        static PluginHostType hostType;
        return hostType;
    }

    //==============================================================================
    // A component to hold the AudioProcessorEditor, and cope with some housekeeping
    // chores when it changes or repaints.
    class EditorCompWrapper  : public Component,
                               public AsyncUpdater
    {
    public:
        EditorCompWrapper (JuceVSTWrapper& wrapper_, AudioProcessorEditor* editor)
            : wrapper (wrapper_)
        {
            setOpaque (true);
            editor->setOpaque (true);

            setBounds (editor->getBounds());
            editor->setTopLeftPosition (0, 0);
            addAndMakeVisible (editor);

          #if JUCE_WIN
            if (! getHostType().isReceptor())
                addMouseListener (this, true);
          #endif
        }

        ~EditorCompWrapper()
        {
            deleteAllChildren();
        }

        void paint (Graphics&) {}

        void paintOverChildren (Graphics&)
        {
            // this causes an async call to masterIdle() to help
            // creaky old DAWs like Nuendo repaint themselves while we're
            // repainting. Otherwise they just seem to give up and sit there
            // waiting.
            triggerAsyncUpdate();
        }

      #if JUCE_MAC
        bool keyPressed (const KeyPress& kp)
        {
            // If we have an unused keypress, move the key-focus to a host window
            // and re-inject the event..
            forwardCurrentKeyEventToHost (this);
            return true;
        }
      #endif

        AudioProcessorEditor* getEditorComp() const
        {
            return dynamic_cast <AudioProcessorEditor*> (getChildComponent (0));
        }

        void resized()
        {
            Component* const c = getChildComponent (0);

            if (c != 0)
                c->setBounds (0, 0, getWidth(), getHeight());
        }

        void childBoundsChanged (Component* child)
        {
            child->setTopLeftPosition (0, 0);

            const int cw = child->getWidth();
            const int ch = child->getHeight();

            wrapper.resizeHostWindow (cw, ch);
            setSize (cw, ch);

            #if JUCE_MAC
            wrapper.resizeHostWindow (cw, ch);  // (doing this a second time seems to be necessary in tracktion)
            #endif
        }

        void handleAsyncUpdate()
        {
            wrapper.tryMasterIdle();
        }

      #if JUCE_WINDOWS
        void mouseDown (const MouseEvent&)
        {
            broughtToFront();
        }

        void broughtToFront()
        {
            // for hosts like nuendo, need to also pop the MDI container to the
            // front when our comp is clicked on.
            HWND parent = findMDIParentOf ((HWND) getWindowHandle());

            if (parent != 0)
                SetWindowPos (parent, HWND_TOP, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
        }
      #endif

        //==============================================================================
        juce_UseDebuggingNewOperator

    private:
        JuceVSTWrapper& wrapper;
    };

    //==============================================================================
    juce_UseDebuggingNewOperator

private:
    AudioProcessor* filter;
    JUCE_NAMESPACE::MemoryBlock chunkMemory;
    JUCE_NAMESPACE::uint32 chunkMemoryTime;
    ScopedPointer<EditorCompWrapper> editorComp;
    ERect editorSize;
    MidiBuffer midiEvents;
    VSTMidiEventList outgoingEvents;
    bool isProcessing;
    bool hasShutdown;
    bool firstProcessCallback;
    int diffW, diffH;
    VstSpeakerArrangementType speakerIn, speakerOut;
    int numInChans, numOutChans;
    HeapBlock <float*> channels;
    Array<float*> tempChannels; // see note in processReplacing()
    bool shouldDeleteEditor;

    //==============================================================================
#if JUCE_WINDOWS   // Workarounds for Wavelab's happy-go-lucky use of threads.
    class NonWavelabMMLock
    {
    public:
        NonWavelabMMLock() : mm (getHostType().isWavelab() || getHostType().isCubaseBridged() ? 0 : new MessageManagerLock())  {}
        ~NonWavelabMMLock() {}

    private:
        ScopedPointer <MessageManagerLock> mm;
    };

    static void checkWhetherWavelabHasChangedThread()
    {
        if (getHostType().isWavelab() || getHostType().isCubaseBridged())
        {
            static bool messageThreadIsDefinitelyCorrect = false;

            if (! messageThreadIsDefinitelyCorrect)
            {
                MessageManager::getInstance()->setCurrentThreadAsMessageThread();

                class MessageThreadCallback  : public CallbackMessage
                {
                public:
                    MessageThreadCallback (bool& triggered_) : triggered (triggered_) {}

                    void messageCallback()
                    {
                        triggered = true;
                    }

                private:
                    bool& triggered;
                };

                (new MessageThreadCallback (messageThreadIsDefinitelyCorrect))->post();
            }
        }
    }
#else
    typedef MessageManagerLock NonWavelabMMLock;
    static void checkWhetherWavelabHasChangedThread() {}
#endif

    //==============================================================================
    void deleteTempChannels()
    {
        for (int i = tempChannels.size(); --i >= 0;)
            delete[] (tempChannels.getUnchecked(i));

        tempChannels.clear();

        if (filter != 0)
            tempChannels.insertMultiple (0, 0, filter->getNumInputChannels() + filter->getNumOutputChannels());
    }

    const String getHostName()
    {
        char host[256];
        zeromem (host, sizeof (host));
        getHostProductString (host);
        return host;
    }

  #if JUCE_MAC
    void* hostWindow;
  #elif JUCE_LINUX
    Window hostWindow;
  #else
    HWND hostWindow;
  #endif
};

//==============================================================================
/** Somewhere in the codebase of your plugin, you need to implement this function
    and make it create an instance of the filter subclass that you're building.
*/
extern AudioProcessor* JUCE_CALLTYPE createPluginFilter();


//==============================================================================
static AEffect* pluginEntryPoint (audioMasterCallback audioMaster)
{
    JUCE_AUTORELEASEPOOL
    initialiseJuce_GUI();

    try
    {
        if (audioMaster (0, audioMasterVersion, 0, 0, 0, 0) != 0)
        {
            AudioProcessor* const filter = createPluginFilter();

            if (filter != 0)
            {
                JuceVSTWrapper* const wrapper = new JuceVSTWrapper (audioMaster, filter);
                return wrapper->getAeffect();
            }
        }
    }
    catch (...)
    {}

    return 0;
}


//==============================================================================
// Mac startup code..
#if JUCE_MAC

extern "C" __attribute__ ((visibility("default"))) AEffect* VSTPluginMain (audioMasterCallback audioMaster)
{
    initialiseMac();
    return pluginEntryPoint (audioMaster);
}

extern "C" __attribute__ ((visibility("default"))) AEffect* main_macho (audioMasterCallback audioMaster)
{
    initialiseMac();
    return pluginEntryPoint (audioMaster);
}

//==============================================================================
// Linux startup code..
#elif JUCE_LINUX

extern "C" AEffect* VSTPluginMain (audioMasterCallback audioMaster)
{
    SharedMessageThread::getInstance();

    return pluginEntryPoint (audioMaster);
}

extern "C" __attribute__ ((visibility("default"))) AEffect* main_plugin (audioMasterCallback audioMaster) asm ("main");

extern "C" __attribute__ ((visibility("default"))) AEffect* main_plugin (audioMasterCallback audioMaster)
{
    return VSTPluginMain (audioMaster);
}

__attribute__((constructor)) void myPluginInit()
{
    // don't put initialiseJuce_GUI here... it will crash !
}

__attribute__((destructor)) void myPluginFini()
{
    // don't put shutdownJuce_GUI here... it will crash !
}

//==============================================================================
// Win32 startup code..
#else

extern "C" __declspec (dllexport) AEffect* VSTPluginMain (audioMasterCallback audioMaster)
{
    return pluginEntryPoint (audioMaster);
}

#ifndef _WIN64 // (can't compile this on win64, but it's not needed anyway with VST2.4)
extern "C" __declspec (dllexport) void* main (audioMasterCallback audioMaster)
{
    return (void*) pluginEntryPoint (audioMaster);
}
#endif

#if JucePlugin_Build_RTAS
BOOL WINAPI DllMainVST (HINSTANCE instance, DWORD dwReason, LPVOID)
#else
extern "C" BOOL WINAPI DllMain (HINSTANCE instance, DWORD dwReason, LPVOID)
#endif
{
    if (dwReason == DLL_PROCESS_ATTACH)
        PlatformUtilities::setCurrentModuleInstanceHandle (instance);

    return TRUE;
}

#endif

#endif