JUCE/modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm

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

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-11 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.

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

// Your project must contain an AppConfig.h file with your project-specific settings in it,
// and your header search path must make it accessible to the module's files.
#include "AppConfig.h"

#include "../utility/juce_CheckSettingMacros.h"

#if JucePlugin_Build_AU

#if __LP64__
 #undef JUCE_SUPPORT_CARBON
 #define JUCE_SUPPORT_CARBON 0
#endif

#include "../utility/juce_IncludeSystemHeaders.h"

#include <AudioUnit/AUCocoaUIView.h>
#include <AudioUnit/AudioUnit.h>
#include <AudioToolbox/AudioUnitUtilities.h>

#if JUCE_SUPPORT_CARBON
 #define Point CarbonDummyPointName
 #define Component CarbonDummyCompName
#endif
#include "AUMIDIEffectBase.h"
#include "MusicDeviceBase.h"
#undef Point
#undef Component

/** The BUILD_AU_CARBON_UI flag lets you specify whether old-school carbon hosts are supported as
    well as ones that can open a cocoa view. If this is enabled, you'll need to also add the AUCarbonBase
    files to your project.
*/
#if ! (defined (BUILD_AU_CARBON_UI) || JUCE_64BIT)
 #define BUILD_AU_CARBON_UI 1
#endif

#ifdef __LP64__
 #undef BUILD_AU_CARBON_UI  // (not possible in a 64-bit build)
#endif

#if BUILD_AU_CARBON_UI
 #undef Button
 #define Point CarbonDummyPointName
 #include "AUCarbonViewBase.h"
 #undef Point
 class JuceAUView;
#endif

#define JUCE_MAC_WINDOW_VISIBITY_BODGE 1

#include "../utility/juce_IncludeModuleHeaders.h"
#include "../utility/juce_FakeMouseMoveGenerator.h"
#include "../utility/juce_CarbonVisibility.h"
#include "../utility/juce_PluginHostType.h"
#include "../../juce_core/native/juce_osx_ObjCHelpers.h"

//==============================================================================
#define JuceUICreationClass   JucePlugin_AUCocoaViewClassName

#define juceFilterObjectPropertyID 0x1a45ffe9
static Array<void*> activePlugins, activeUIs;

static const short channelConfigs[][2] = { JucePlugin_PreferredChannelConfigurations };
static const int numChannelConfigs = sizeof (channelConfigs) / sizeof (*channelConfigs);

#if JucePlugin_IsSynth
 #define JuceAUBaseClass MusicDeviceBase
#else
 #define JuceAUBaseClass AUMIDIEffectBase
#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();

//==============================================================================
class JuceAU   : public JuceAUBaseClass,
                 public AudioProcessorListener,
                 public AudioPlayHead,
                 public ComponentListener
{
public:
    //==============================================================================
    JuceAU (AudioUnit component)
      #if JucePlugin_IsSynth
        : MusicDeviceBase (component, 0, 1),
      #else
        : AUMIDIEffectBase (component),
      #endif
          bufferSpace (2, 16),
          prepared (false)
    {
        if (activePlugins.size() + activeUIs.size() == 0)
        {
           #if BUILD_AU_CARBON_UI
            NSApplicationLoad();
           #endif

            initialiseJuce_GUI();
        }

        juceFilter = createPluginFilter();
        jassert (juceFilter != nullptr);

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

        Globals()->UseIndexedParameters (juceFilter->getNumParameters());

        activePlugins.add (this);

        zerostruct (auEvent);
        auEvent.mArgument.mParameter.mAudioUnit = GetComponentInstance();
        auEvent.mArgument.mParameter.mScope = kAudioUnitScope_Global;
        auEvent.mArgument.mParameter.mElement = 0;

        CreateElements();

        CAStreamBasicDescription streamDescription;
        streamDescription.mSampleRate = GetSampleRate();
        streamDescription.SetCanonical (channelConfigs[0][1], false);
        Outputs().GetIOElement(0)->SetStreamFormat (streamDescription);

       #if ! JucePlugin_IsSynth
        streamDescription.SetCanonical (channelConfigs[0][0], false);
        Inputs().GetIOElement(0)->SetStreamFormat (streamDescription);
       #endif
    }

    ~JuceAU()
    {
        deleteActiveEditors();
        juceFilter = nullptr;

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

        if (activePlugins.size() + activeUIs.size() == 0)
            shutdownJuce_GUI();
    }

    void deleteActiveEditors();

    //==============================================================================
    ComponentResult GetPropertyInfo (AudioUnitPropertyID inID,
                                     AudioUnitScope inScope,
                                     AudioUnitElement inElement,
                                     UInt32& outDataSize,
                                     Boolean& outWritable)
    {
        if (inScope == kAudioUnitScope_Global)
        {
            if (inID == juceFilterObjectPropertyID)
            {
                outWritable = false;
                outDataSize = sizeof (void*) * 2;
                return noErr;
            }
            else if (inID == kAudioUnitProperty_OfflineRender)
            {
                outWritable = true;
                outDataSize = sizeof (UInt32);
                return noErr;
            }
            else if (inID == kMusicDeviceProperty_InstrumentCount)
            {
                outDataSize = sizeof (UInt32);
                outWritable = false;
                return noErr;
            }
            else if (inID == kAudioUnitProperty_CocoaUI)
            {
              #if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
                // (On 10.4, there's a random obj-c dispatching crash when trying to load a cocoa UI)
                if (SystemStats::getOSXMinorVersionNumber() > 4)
              #endif
                {
                    outDataSize = sizeof (AudioUnitCocoaViewInfo);
                    outWritable = true;
                    return noErr;
                }
            }
        }

        return JuceAUBaseClass::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
    }

    ComponentResult GetProperty (AudioUnitPropertyID inID,
                                 AudioUnitScope inScope,
                                 AudioUnitElement inElement,
                                 void* outData)
    {
        if (inScope == kAudioUnitScope_Global)
        {
            if (inID == juceFilterObjectPropertyID)
            {
                ((void**) outData)[0] = (void*) static_cast <AudioProcessor*> (juceFilter);
                ((void**) outData)[1] = (void*) this;
                return noErr;
            }
            else if (inID == kAudioUnitProperty_OfflineRender)
            {
                *(UInt32*) outData = (juceFilter != nullptr && juceFilter->isNonRealtime()) ? 1 : 0;
                return noErr;
            }
            else if (inID == kMusicDeviceProperty_InstrumentCount)
            {
                *(UInt32*) outData = 1;
                return noErr;
            }
            else if (inID == kAudioUnitProperty_CocoaUI)
            {
               #if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
                // (On 10.4, there's a random obj-c dispatching crash when trying to load a cocoa UI)
                if (SystemStats::getOSXMinorVersionNumber() > 4)
               #endif
                {
                    JUCE_AUTORELEASEPOOL

                    AudioUnitCocoaViewInfo* info = (AudioUnitCocoaViewInfo*) outData;

                    const File bundleFile (File::getSpecialLocation (File::currentApplicationFile));
                    NSString* bundlePath = [NSString stringWithUTF8String: (const char*) bundleFile.getFullPathName().toUTF8()];
                    NSBundle* b = [NSBundle bundleWithPath: bundlePath];

                    info->mCocoaAUViewClass[0] = (CFStringRef) [nsStringLiteral (JUCE_STRINGIFY (JuceUICreationClass)) retain];
                    info->mCocoaAUViewBundleLocation = (CFURLRef) [[NSURL fileURLWithPath: [b bundlePath]] retain];

                    return noErr;
                }
            }
        }

        return JuceAUBaseClass::GetProperty (inID, inScope, inElement, outData);
    }

    ComponentResult SetProperty (AudioUnitPropertyID inID,
                                 AudioUnitScope inScope,
                                 AudioUnitElement inElement,
                                 const void* inData,
                                 UInt32 inDataSize)
    {
        if (inScope == kAudioUnitScope_Global && inID == kAudioUnitProperty_OfflineRender)
        {
            if (juceFilter != nullptr)
                juceFilter->setNonRealtime ((*(UInt32*) inData) != 0);

            return noErr;
        }

        return JuceAUBaseClass::SetProperty (inID, inScope, inElement, inData, inDataSize);
    }

    ComponentResult SaveState (CFPropertyListRef* outData)
    {
        ComponentResult err = JuceAUBaseClass::SaveState (outData);

        if (err != noErr)
            return err;

        jassert (CFGetTypeID (*outData) == CFDictionaryGetTypeID());

        CFMutableDictionaryRef dict = (CFMutableDictionaryRef) *outData;

        if (juceFilter != nullptr)
        {
            juce::MemoryBlock state;
            juceFilter->getCurrentProgramStateInformation (state);

            if (state.getSize() > 0)
            {
                CFDataRef ourState = CFDataCreate (kCFAllocatorDefault, (const UInt8*) state.getData(), state.getSize());
                CFDictionarySetValue (dict, CFSTR("jucePluginState"), ourState);
                CFRelease (ourState);
            }
        }

        return noErr;
    }

    ComponentResult RestoreState (CFPropertyListRef inData)
    {
        ComponentResult err = JuceAUBaseClass::RestoreState (inData);

        if (err != noErr)
            return err;

        if (juceFilter != nullptr)
        {
            CFDictionaryRef dict = (CFDictionaryRef) inData;
            CFDataRef data = 0;

            if (CFDictionaryGetValueIfPresent (dict, CFSTR("jucePluginState"), (const void**) &data))
            {
                if (data != 0)
                {
                    const int numBytes = (int) CFDataGetLength (data);
                    const juce::uint8* const rawBytes = CFDataGetBytePtr (data);

                    if (numBytes > 0)
                        juceFilter->setCurrentProgramStateInformation (rawBytes, numBytes);
                }
            }
        }

        return noErr;
    }

    UInt32 SupportedNumChannels (const AUChannelInfo** outInfo)
    {
        // If you hit this, then you need to add some configurations to your
        // JucePlugin_PreferredChannelConfigurations setting..
        jassert (numChannelConfigs > 0);

        if (outInfo != nullptr)
        {
            *outInfo = channelInfo;

            for (int i = 0; i < numChannelConfigs; ++i)
            {
              #if JucePlugin_IsSynth
                channelInfo[i].inChannels = 0;
              #else
                channelInfo[i].inChannels = channelConfigs[i][0];
              #endif
                channelInfo[i].outChannels = channelConfigs[i][1];
            }
        }

        return numChannelConfigs;
    }

    //==============================================================================
    ComponentResult GetParameterInfo (AudioUnitScope inScope,
                                      AudioUnitParameterID inParameterID,
                                      AudioUnitParameterInfo& outParameterInfo)
    {
        const int index = (int) inParameterID;

        if (inScope == kAudioUnitScope_Global
             && juceFilter != nullptr
             && index < juceFilter->getNumParameters())
        {
            outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable
                                      | kAudioUnitParameterFlag_IsReadable
                                      | kAudioUnitParameterFlag_HasCFNameString;

            const String name (juceFilter->getParameterName (index));

            // set whether the param is automatable (unnamed parameters aren't allowed to be automated)
            if (name.isEmpty() || ! juceFilter->isParameterAutomatable (index))
                outParameterInfo.flags |= kAudioUnitParameterFlag_NonRealTime;

            if (juceFilter->isMetaParameter (index))
                outParameterInfo.flags |= kAudioUnitParameterFlag_IsGlobalMeta;

            AUBase::FillInParameterName (outParameterInfo, name.toCFString(), false);

            outParameterInfo.minValue = 0.0f;
            outParameterInfo.maxValue = 1.0f;
            outParameterInfo.defaultValue = 0.0f;
            outParameterInfo.unit = kAudioUnitParameterUnit_Generic;

            return noErr;
        }
        else
        {
            return kAudioUnitErr_InvalidParameter;
        }
    }

    ComponentResult GetParameter (AudioUnitParameterID inID,
                                  AudioUnitScope inScope,
                                  AudioUnitElement inElement,
                                  Float32& outValue)
    {
        if (inScope == kAudioUnitScope_Global && juceFilter != nullptr)
        {
            outValue = juceFilter->getParameter ((int) inID);
            return noErr;
        }

        return AUBase::GetParameter (inID, inScope, inElement, outValue);
    }

    ComponentResult SetParameter (AudioUnitParameterID inID,
                                  AudioUnitScope inScope,
                                  AudioUnitElement inElement,
                                  Float32 inValue,
                                  UInt32 inBufferOffsetInFrames)
    {
        if (inScope == kAudioUnitScope_Global && juceFilter != nullptr)
        {
            juceFilter->setParameter ((int) inID, inValue);
            return noErr;
        }

        return AUBase::SetParameter (inID, inScope, inElement, inValue, inBufferOffsetInFrames);
    }

    //==============================================================================
    ComponentResult Version()                   { return JucePlugin_VersionCode; }
    bool SupportsTail()                         { return true; }
    Float64 GetTailTime()                       { return (JucePlugin_TailLengthSeconds); }
    Float64 GetSampleRate()                     { return GetOutput(0)->GetStreamFormat().mSampleRate; }

    Float64 GetLatency()
    {
        jassert (GetSampleRate() > 0);

        if (GetSampleRate() <= 0)
            return 0.0;

        return juceFilter->getLatencySamples() / GetSampleRate();
    }

    //==============================================================================
   #if BUILD_AU_CARBON_UI
    int GetNumCustomUIComponents()
    {
        return PluginHostType().isDigitalPerformer() ? 0 : 1;
    }

    void GetUIComponentDescs (ComponentDescription* inDescArray)
    {
        inDescArray[0].componentType = kAudioUnitCarbonViewComponentType;
        inDescArray[0].componentSubType = JucePlugin_AUSubType;
        inDescArray[0].componentManufacturer = JucePlugin_AUManufacturerCode;
        inDescArray[0].componentFlags = 0;
        inDescArray[0].componentFlagsMask = 0;
    }
   #endif

    //==============================================================================
    bool getCurrentPosition (AudioPlayHead::CurrentPositionInfo& info)
    {
        info.timeSigNumerator = 0;
        info.timeSigDenominator = 0;
        info.timeInSeconds = 0;
        info.editOriginTime = 0;
        info.ppqPositionOfLastBarStart = 0;
        info.isPlaying = false;
        info.isRecording = false;
        info.isLooping = false;
        info.ppqLoopStart = 0;
        info.ppqLoopEnd = 0;

        switch (lastSMPTETime.mType)
        {
            case kSMPTETimeType24:          info.frameRate = AudioPlayHead::fps24; break;
            case kSMPTETimeType25:          info.frameRate = AudioPlayHead::fps25; break;
            case kSMPTETimeType30Drop:      info.frameRate = AudioPlayHead::fps30drop; break;
            case kSMPTETimeType30:          info.frameRate = AudioPlayHead::fps30; break;
            case kSMPTETimeType2997:        info.frameRate = AudioPlayHead::fps2997; break;
            case kSMPTETimeType2997Drop:    info.frameRate = AudioPlayHead::fps2997drop; break;
            //case kSMPTETimeType60:
            //case kSMPTETimeType5994:
            default:                        info.frameRate = AudioPlayHead::fpsUnknown; break;
        }

        if (CallHostBeatAndTempo (&info.ppqPosition, &info.bpm) != noErr)
        {
            info.ppqPosition = 0;
            info.bpm = 0;
        }

        UInt32 outDeltaSampleOffsetToNextBeat;
        double outCurrentMeasureDownBeat;
        float num;
        UInt32 den;

        if (CallHostMusicalTimeLocation (&outDeltaSampleOffsetToNextBeat, &num, &den,
                                         &outCurrentMeasureDownBeat) == noErr)
        {
            info.timeSigNumerator = (int) num;
            info.timeSigDenominator = den;
            info.ppqPositionOfLastBarStart = outCurrentMeasureDownBeat;
        }

        double outCurrentSampleInTimeLine, outCycleStartBeat, outCycleEndBeat;
        Boolean playing, playchanged, looping;

        if (CallHostTransportState (&playing,
                                    &playchanged,
                                    &outCurrentSampleInTimeLine,
                                    &looping,
                                    &outCycleStartBeat,
                                    &outCycleEndBeat) == noErr)
        {
            info.isPlaying = playing;
            info.timeInSeconds = outCurrentSampleInTimeLine / GetSampleRate();
        }

        return true;
    }

    void sendAUEvent (const AudioUnitEventType type, const int index)
    {
        if (AUEventListenerNotify != 0)
        {
            auEvent.mEventType = type;
            auEvent.mArgument.mParameter.mParameterID = (AudioUnitParameterID) index;
            AUEventListenerNotify (0, 0, &auEvent);
        }
    }

    void audioProcessorParameterChanged (AudioProcessor*, int index, float /*newValue*/)
    {
        sendAUEvent (kAudioUnitEvent_ParameterValueChange, index);
    }

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

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

    void audioProcessorChanged (AudioProcessor*)
    {
        // xxx is there an AU equivalent?
    }

    bool StreamFormatWritable (AudioUnitScope, AudioUnitElement)
    {
        return ! IsInitialized();
    }

    // (these two slightly different versions are because the definition changed between 10.4 and 10.5)
    ComponentResult StartNote (MusicDeviceInstrumentID, MusicDeviceGroupID, NoteInstanceID&, UInt32, const MusicDeviceNoteParams&) { return noErr; }
    ComponentResult StartNote (MusicDeviceInstrumentID, MusicDeviceGroupID, NoteInstanceID*, UInt32, const MusicDeviceNoteParams&) { return noErr; }
    ComponentResult StopNote (MusicDeviceGroupID, NoteInstanceID, UInt32)   { return noErr; }

    //==============================================================================
    ComponentResult Initialize()
    {
       #if ! JucePlugin_IsSynth
        const int numIns = GetInput(0) != 0 ? GetInput(0)->GetStreamFormat().mChannelsPerFrame : 0;
       #endif
        const int numOuts = GetOutput(0) != 0 ? GetOutput(0)->GetStreamFormat().mChannelsPerFrame : 0;

        bool isValidChannelConfig = false;

        for (int i = 0; i < numChannelConfigs; ++i)
          #if JucePlugin_IsSynth
            if (numOuts == channelConfigs[i][1])
          #else
            if (numIns == channelConfigs[i][0] && numOuts == channelConfigs[i][1])
          #endif
                isValidChannelConfig = true;

        if (! isValidChannelConfig)
            return kAudioUnitErr_FormatNotSupported;

        JuceAUBaseClass::Initialize();
        prepareToPlay();
        return noErr;
    }

    void Cleanup()
    {
        JuceAUBaseClass::Cleanup();

        if (juceFilter != nullptr)
            juceFilter->releaseResources();

        bufferSpace.setSize (2, 16);
        midiEvents.clear();
        incomingEvents.clear();
        prepared = false;
    }

    ComponentResult Reset (AudioUnitScope inScope, AudioUnitElement inElement)
    {
        if (! prepared)
            prepareToPlay();

        if (juceFilter != nullptr)
            juceFilter->reset();

        return JuceAUBaseClass::Reset (inScope, inElement);
    }

    void prepareToPlay()
    {
        if (juceFilter != nullptr)
        {
            juceFilter->setPlayConfigDetails (
                 #if ! JucePlugin_IsSynth
                  GetInput(0)->GetStreamFormat().mChannelsPerFrame,
                 #else
                  0,
                 #endif
                  GetOutput(0)->GetStreamFormat().mChannelsPerFrame,
                  GetSampleRate(),
                  GetMaxFramesPerSlice());

            bufferSpace.setSize (juceFilter->getNumInputChannels() + juceFilter->getNumOutputChannels(),
                                 GetMaxFramesPerSlice() + 32);

            juceFilter->prepareToPlay (GetSampleRate(), GetMaxFramesPerSlice());

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

            channels.calloc (jmax (juceFilter->getNumInputChannels(),
                                   juceFilter->getNumOutputChannels()) + 4);

            prepared = true;
        }
    }

    ComponentResult Render (AudioUnitRenderActionFlags &ioActionFlags,
                            const AudioTimeStamp& inTimeStamp,
                            UInt32 nFrames)
    {
        lastSMPTETime = inTimeStamp.mSMPTETime;

       #if ! JucePlugin_IsSynth
        return JuceAUBaseClass::Render (ioActionFlags, inTimeStamp, nFrames);
       #else
        // synths can't have any inputs..
        AudioBufferList inBuffer;
        inBuffer.mNumberBuffers = 0;

        return ProcessBufferLists (ioActionFlags, inBuffer, GetOutput(0)->GetBufferList(), nFrames);
       #endif
    }

    OSStatus ProcessBufferLists (AudioUnitRenderActionFlags& ioActionFlags,
                                 const AudioBufferList& inBuffer,
                                 AudioBufferList& outBuffer,
                                 UInt32 numSamples)
    {
        if (juceFilter != nullptr)
        {
            jassert (prepared);

            int numOutChans = 0;
            int nextSpareBufferChan = 0;
            bool needToReinterleave = false;
            const int numIn = juceFilter->getNumInputChannels();
            const int numOut = juceFilter->getNumOutputChannels();

            unsigned int i;
            for (i = 0; i < outBuffer.mNumberBuffers; ++i)
            {
                AudioBuffer& buf = outBuffer.mBuffers[i];

                if (buf.mNumberChannels == 1)
                {
                    channels [numOutChans++] = (float*) buf.mData;
                }
                else
                {
                    needToReinterleave = true;

                    for (unsigned int subChan = 0; subChan < buf.mNumberChannels && numOutChans < numOut; ++subChan)
                        channels [numOutChans++] = bufferSpace.getSampleData (nextSpareBufferChan++);
                }

                if (numOutChans >= numOut)
                    break;
            }

            int numInChans = 0;

            for (i = 0; i < inBuffer.mNumberBuffers; ++i)
            {
                const AudioBuffer& buf = inBuffer.mBuffers[i];

                if (buf.mNumberChannels == 1)
                {
                    if (numInChans < numOutChans)
                        memcpy (channels [numInChans], (const float*) buf.mData, sizeof (float) * numSamples);
                    else
                        channels [numInChans] = (float*) buf.mData;

                    ++numInChans;
                }
                else
                {
                    // need to de-interleave..
                    for (unsigned int subChan = 0; subChan < buf.mNumberChannels && numInChans < numIn; ++subChan)
                    {
                        float* dest;

                        if (numInChans < numOutChans)
                        {
                            dest = channels [numInChans++];
                        }
                        else
                        {
                            dest = bufferSpace.getSampleData (nextSpareBufferChan++);
                            channels [numInChans++] = dest;
                        }

                        const float* src = ((const float*) buf.mData) + subChan;

                        for (int j = numSamples; --j >= 0;)
                        {
                            *dest++ = *src;
                            src += buf.mNumberChannels;
                        }
                    }
                }

                if (numInChans >= numIn)
                    break;
            }

            {
                const ScopedLock sl (incomingMidiLock);
                midiEvents.clear();
                incomingEvents.swapWith (midiEvents);
            }

            {
                AudioSampleBuffer buffer (channels, jmax (numIn, numOut), numSamples);

                const ScopedLock sl (juceFilter->getCallbackLock());

                if (juceFilter->isSuspended())
                {
                    for (int i = 0; i < numOut; ++i)
                        zeromem (channels [i], sizeof (float) * numSamples);
                }
                else
                {
                    juceFilter->processBlock (buffer, midiEvents);
                }
            }

            if (! midiEvents.isEmpty())
            {
               #if JucePlugin_ProducesMidiOutput
                const juce::uint8* midiEventData;
                int midiEventSize, midiEventPosition;
                MidiBuffer::Iterator i (midiEvents);

                while (i.getNextEvent (midiEventData, midiEventSize, midiEventPosition))
                {
                    jassert (isPositiveAndBelow (midiEventPosition, (int) numSamples));



                    //xxx
                }
               #else
                // if your plugin creates midi messages, you'll need to set
                // the JucePlugin_ProducesMidiOutput macro to 1 in your
                // JucePluginCharacteristics.h file
                //jassert (midiEvents.getNumEvents() <= numMidiEventsComingIn);
               #endif

                midiEvents.clear();
            }

            if (needToReinterleave)
            {
                nextSpareBufferChan = 0;

                for (i = 0; i < outBuffer.mNumberBuffers; ++i)
                {
                    AudioBuffer& buf = outBuffer.mBuffers[i];

                    if (buf.mNumberChannels > 1)
                    {
                        for (unsigned int subChan = 0; subChan < buf.mNumberChannels; ++subChan)
                        {
                            const float* src = bufferSpace.getSampleData (nextSpareBufferChan++);
                            float* dest = ((float*) buf.mData) + subChan;

                            for (int j = numSamples; --j >= 0;)
                            {
                                *dest = *src++;
                                dest += buf.mNumberChannels;
                            }
                        }
                    }
                }
            }

           #if ! JucePlugin_SilenceInProducesSilenceOut
            ioActionFlags &= ~kAudioUnitRenderAction_OutputIsSilence;
           #endif
        }

        return noErr;
    }

protected:
    OSStatus HandleMidiEvent (UInt8 nStatus, UInt8 inChannel, UInt8 inData1, UInt8 inData2,
                             #if defined (MAC_OS_X_VERSION_10_5)
                              UInt32 inStartFrame)
                             #else
                              long inStartFrame)
                             #endif
    {
       #if JucePlugin_WantsMidiInput
        const ScopedLock sl (incomingMidiLock);
        const juce::uint8 data[] = { (juce::uint8) (nStatus | inChannel),
                                     (juce::uint8) inData1,
                                     (juce::uint8) inData2 };

        incomingEvents.addEvent (data, 3, inStartFrame);
       #endif

        return noErr;
    }

    OSStatus HandleSysEx (const UInt8* inData, UInt32 inLength)
    {
       #if JucePlugin_WantsMidiInput
        const ScopedLock sl (incomingMidiLock);
        incomingEvents.addEvent (inData, inLength, 0);
       #endif
        return noErr;
    }

    //==============================================================================
    ComponentResult GetPresets (CFArrayRef* outData) const
    {
        if (outData != nullptr)
        {
            const int numPrograms = juceFilter->getNumPrograms();
            presetsArray.ensureSize (sizeof (AUPreset) * numPrograms, true);
            AUPreset* const presets = (AUPreset*) presetsArray.getData();

            CFMutableArrayRef presetsArray = CFArrayCreateMutable (0, numPrograms, 0);

            for (int i = 0; i < numPrograms; ++i)
            {
                presets[i].presetNumber = i;
                presets[i].presetName = juceFilter->getProgramName(i).toCFString();

                CFArrayAppendValue (presetsArray, presets + i);
            }

            *outData = (CFArrayRef) presetsArray;
        }

        return noErr;
    }

    OSStatus NewFactoryPresetSet (const AUPreset& inNewFactoryPreset)
    {
        const int numPrograms = juceFilter->getNumPrograms();
        const SInt32 chosenPresetNumber = (int) inNewFactoryPreset.presetNumber;

        if (chosenPresetNumber >= numPrograms)
            return kAudioUnitErr_InvalidProperty;

        AUPreset chosenPreset;
        chosenPreset.presetNumber = chosenPresetNumber;
        chosenPreset.presetName = juceFilter->getProgramName (chosenPresetNumber).toCFString();

        juceFilter->setCurrentProgram (chosenPresetNumber);
        SetAFactoryPresetAsCurrent (chosenPreset);

        return noErr;
    }

    void componentMovedOrResized (Component& component, bool /*wasMoved*/, bool /*wasResized*/)
    {
        NSView* view = (NSView*) component.getWindowHandle();
        NSRect r = [[view superview] frame];
        r.origin.y = r.origin.y + r.size.height - component.getHeight();
        r.size.width = component.getWidth();
        r.size.height = component.getHeight();
        [[view superview] setFrame: r];
        [view setFrame: NSMakeRect (0, 0, component.getWidth(), component.getHeight())];
        [view setNeedsDisplay: YES];
    }

private:
    //==============================================================================
    ScopedPointer<AudioProcessor> juceFilter;
    AudioSampleBuffer bufferSpace;
    HeapBlock <float*> channels;
    MidiBuffer midiEvents, incomingEvents;
    bool prepared;
    SMPTETime lastSMPTETime;
    AUChannelInfo channelInfo [numChannelConfigs];
    AudioUnitEvent auEvent;
    mutable juce::MemoryBlock presetsArray;
    CriticalSection incomingMidiLock;

    JUCE_DECLARE_NON_COPYABLE (JuceAU);
};

//==============================================================================
class EditorCompHolder  : public Component
{
public:
    EditorCompHolder (AudioProcessorEditor* const editor)
    {
        setSize (editor->getWidth(), editor->getHeight());
        addAndMakeVisible (editor);

       #if ! JucePlugin_EditorRequiresKeyboardFocus
        setWantsKeyboardFocus (false);
       #else
        setWantsKeyboardFocus (true);
       #endif
    }

    ~EditorCompHolder()
    {
        deleteAllChildren(); // note that we can't use a ScopedPointer because the editor may
                             // have been transferred to another parent which takes over ownership.
    }

    static NSView* createViewFor (AudioProcessor* filter, JuceAU* au, AudioProcessorEditor* const editor)
    {
        EditorCompHolder* editorCompHolder = new EditorCompHolder (editor);
        NSRect r = NSMakeRect (0, 0, editorCompHolder->getWidth(), editorCompHolder->getHeight());

        static JuceUIViewClass cls;
        NSView* view = [[cls.createInstance() initWithFrame: r] autorelease];

        JuceUIViewClass::setFilter (view, filter);
        JuceUIViewClass::setAU (view, au);
        JuceUIViewClass::setEditor (view, editorCompHolder);

        [view setHidden: NO];
        [view setPostsFrameChangedNotifications: YES];

        [[NSNotificationCenter defaultCenter] addObserver: view
                                                 selector: @selector (applicationWillTerminate:)
                                                     name: NSApplicationWillTerminateNotification
                                                   object: nil];
        activeUIs.add (view);

        editorCompHolder->addToDesktop (0, (void*) view);
        editorCompHolder->setVisible (view);
        return view;
    }

    void childBoundsChanged (Component*)
    {
        Component* editor = getChildComponent(0);

        if (editor != nullptr)
        {
            const int w = jmax (32, editor->getWidth());
            const int h = jmax (32, editor->getHeight());

            if (getWidth() != w || getHeight() != h)
                setSize (w, h);

            NSView* view = (NSView*) getWindowHandle();
            NSRect r = [[view superview] frame];
            r.size.width = editor->getWidth();
            r.size.height = editor->getHeight();
            [[view superview] setFrame: r];
            [view setFrame: NSMakeRect (0, 0, editor->getWidth(), editor->getHeight())];
            [view setNeedsDisplay: YES];
        }
    }

    //==============================================================================
    struct JuceUIViewClass  : public ObjCClass <NSView>
    {
        JuceUIViewClass()  : ObjCClass <NSView> ("JUCEAUView_")
        {
            addIvar<AudioProcessor*> ("filter");
            addIvar<JuceAU*> ("au");
            addIvar<EditorCompHolder*> ("editor");

            addMethod (@selector (dealloc),                     dealloc,                    "v@:");
            addMethod (@selector (applicationWillTerminate:),   applicationWillTerminate,   "v@:@");
            addMethod (@selector (viewDidMoveToWindow),         viewDidMoveToWindow,        "v@:");
            addMethod (@selector (mouseDownCanMoveWindow),      mouseDownCanMoveWindow,     "c@:");

            registerClass();
        }

        static void deleteEditor (id self)
        {
            ScopedPointer<EditorCompHolder> editorComp (getEditor (self));

            if (editorComp != nullptr)
            {
                JuceAU* const au = getAU (self);

                if (editorComp->getChildComponent(0) != nullptr)
                {
                    if (activePlugins.contains (au)) // plugin may have been deleted before the UI
                    {
                        AudioProcessor* const filter = getIvar<AudioProcessor*> (self, "filter");
                        filter->editorBeingDeleted ((AudioProcessorEditor*) editorComp->getChildComponent(0));
                    }
                }

                editorComp = nullptr;
                setEditor (self, nullptr);
            }
        }

        static JuceAU* getAU (id self)                  { return getIvar<JuceAU*> (self, "au"); }
        static EditorCompHolder* getEditor (id self)    { return getIvar<EditorCompHolder*> (self, "editor"); }

        static void setFilter (id self, AudioProcessor* filter) { object_setInstanceVariable (self, "filter", filter); }
        static void setAU (id self, JuceAU* au)                 { object_setInstanceVariable (self, "au", au); }
        static void setEditor (id self, EditorCompHolder* e)    { object_setInstanceVariable (self, "editor", e); }

    private:
        static void dealloc (id self, SEL)
        {
            if (activeUIs.contains (self))
                shutdown (self);

            sendSuperclassMessage (self, @selector (dealloc));
        }

        static void applicationWillTerminate (id self, SEL, NSNotification*)
        {
            shutdown (self);
        }

        static void shutdown (id self)
        {
            // there's some kind of component currently modal, but the host
            // is trying to delete our plugin..
            jassert (Component::getCurrentlyModalComponent() == nullptr);

            [[NSNotificationCenter defaultCenter] removeObserver: self];
            deleteEditor (self);

            jassert (activeUIs.contains (self));
            activeUIs.removeValue (self);
            if (activePlugins.size() + activeUIs.size() == 0)
                shutdownJuce_GUI();
        }

        static void viewDidMoveToWindow (id self, SEL)
        {
            NSWindow* w = [(NSView*) self window];

            if (w != nil)
            {
                [w setAcceptsMouseMovedEvents: YES];

                EditorCompHolder* const editorComp = getEditor (self);
                if (editorComp != nullptr)
                    [w makeFirstResponder: (NSView*) editorComp->getWindowHandle()];
            }
        }

        static BOOL mouseDownCanMoveWindow (id self, SEL)
        {
            return NO;
        }
    };

private:
    JUCE_DECLARE_NON_COPYABLE (EditorCompHolder);
};

void JuceAU::deleteActiveEditors()
{
    for (int i = activeUIs.size(); --i >= 0;)
    {
        id ui = (id) activeUIs.getUnchecked(i);

        if (EditorCompHolder::JuceUIViewClass::getAU (ui) == this)
            EditorCompHolder::JuceUIViewClass::deleteEditor (ui);
    }
}

//==============================================================================
@interface JuceUICreationClass   : NSObject <AUCocoaUIBase>
{
}

- (unsigned) interfaceVersion;
- (NSString*) description;
- (NSView*) uiViewForAudioUnit: (AudioUnit) inAudioUnit
                      withSize: (NSSize) inPreferredSize;
@end

@implementation JuceUICreationClass

- (unsigned) interfaceVersion
{
    return 0;
}

- (NSString*) description
{
    return [NSString stringWithString: nsStringLiteral (JucePlugin_Name)];
}

- (NSView*) uiViewForAudioUnit: (AudioUnit) inAudioUnit
                      withSize: (NSSize) inPreferredSize
{
    void* pointers[2];
    UInt32 propertySize = sizeof (pointers);

    if (AudioUnitGetProperty (inAudioUnit,
                              juceFilterObjectPropertyID,
                              kAudioUnitScope_Global,
                              0,
                              pointers,
                              &propertySize) != noErr)
        return nil;

    AudioProcessor* filter = (AudioProcessor*) pointers[0];
    JuceAU* au = (JuceAU*) pointers[1];

    if (filter == nullptr)
        return nil;

    AudioProcessorEditor* editorComp = filter->createEditorIfNeeded();
    if (editorComp == nullptr)
        return nil;

    return EditorCompHolder::createViewFor (filter, au, editorComp);
}
@end


#if BUILD_AU_CARBON_UI

//==============================================================================
class JuceAUView  : public AUCarbonViewBase
{
public:
    JuceAUView (AudioUnitCarbonView auview)
      : AUCarbonViewBase (auview),
        juceFilter (nullptr)
    {
    }

    ~JuceAUView()
    {
        deleteUI();
    }

    ComponentResult CreateUI (Float32 /*inXOffset*/, Float32 /*inYOffset*/)
    {
        JUCE_AUTORELEASEPOOL

        if (juceFilter == nullptr)
        {
            void* pointers[2];
            UInt32 propertySize = sizeof (pointers);

            AudioUnitGetProperty (GetEditAudioUnit(),
                                  juceFilterObjectPropertyID,
                                  kAudioUnitScope_Global,
                                  0,
                                  pointers,
                                  &propertySize);

            juceFilter = (AudioProcessor*) pointers[0];
        }

        if (juceFilter != nullptr)
        {
            deleteUI();

            AudioProcessorEditor* editorComp = juceFilter->createEditorIfNeeded();
            editorComp->setOpaque (true);
            windowComp = new ComponentInHIView (editorComp, mCarbonPane);
        }
        else
        {
            jassertfalse // can't get a pointer to our effect
        }

        return noErr;
    }

    AudioUnitCarbonViewEventListener getEventListener() const   { return mEventListener; }
    void* getEventListenerUserData() const                      { return mEventListenerUserData; }

private:
    //==============================================================================
    AudioProcessor* juceFilter;
    ScopedPointer<Component> windowComp;
    FakeMouseMoveGenerator fakeMouseGenerator;

    void deleteUI()
    {
        if (windowComp != nullptr)
        {
            PopupMenu::dismissAllActiveMenus();

            /* This assertion is triggered when there's some kind of modal component active, and the
               host is trying to delete our plugin.
               If you must use modal components, always use them in a non-blocking way, by never
               calling runModalLoop(), but instead using enterModalState() with a callback that
               will be performed on completion. (Note that this assertion could actually trigger
               a false alarm even if you're doing it correctly, but is here to catch people who
               aren't so careful) */
            jassert (Component::getCurrentlyModalComponent() == nullptr);

            EditorCompHolder* editorCompHolder = dynamic_cast <EditorCompHolder*> (windowComp->getChildComponent(0));
            if (editorCompHolder != nullptr)
            {
                AudioProcessorEditor* audioProcessEditor = dynamic_cast <AudioProcessorEditor*> (editorCompHolder->getChildComponent(0));
                if (audioProcessEditor != nullptr)
                    juceFilter->editorBeingDeleted (audioProcessEditor);
            }

            windowComp = nullptr;
        }
    }

    //==============================================================================
    // Uses a child NSWindow to sit in front of a HIView and display our component
    class ComponentInHIView  : public Component
    {
    public:
        ComponentInHIView (AudioProcessorEditor* const editor_, HIViewRef parentHIView)
            : parentView (parentHIView),
              editor (editor_),
              recursive (false)
        {
            JUCE_AUTORELEASEPOOL

            jassert (editor_ != nullptr);
            addAndMakeVisible (&editor);
            setOpaque (true);
            setVisible (true);
            setBroughtToFrontOnMouseClick (true);

            setSize (editor.getWidth(), editor.getHeight());
            SizeControl (parentHIView, editor.getWidth(), editor.getHeight());

            WindowRef windowRef = HIViewGetWindow (parentHIView);
            hostWindow = [[NSWindow alloc] initWithWindowRef: windowRef];

            [hostWindow retain];
            [hostWindow setCanHide: YES];
            [hostWindow setReleasedWhenClosed: YES];

            updateWindowPos();

           #if ! JucePlugin_EditorRequiresKeyboardFocus
            addToDesktop (ComponentPeer::windowIsTemporary | ComponentPeer::windowIgnoresKeyPresses);
            setWantsKeyboardFocus (false);
           #else
            addToDesktop (ComponentPeer::windowIsTemporary);
            setWantsKeyboardFocus (true);
           #endif

            setVisible (true);
            toFront (false);

            addSubWindow();

            NSWindow* pluginWindow = [((NSView*) getWindowHandle()) window];
            [pluginWindow setNextResponder: hostWindow];

            attachWindowHidingHooks (this, (WindowRef) windowRef, hostWindow);
        }

        ~ComponentInHIView()
        {
            JUCE_AUTORELEASEPOOL

            removeWindowHidingHooks (this);

            NSWindow* pluginWindow = [((NSView*) getWindowHandle()) window];
            [hostWindow removeChildWindow: pluginWindow];
            removeFromDesktop();

            [hostWindow release];
            hostWindow = nil;
        }

        void updateWindowPos()
        {
            HIPoint f;
            f.x = f.y = 0;
            HIPointConvert (&f, kHICoordSpaceView, parentView, kHICoordSpaceScreenPixel, 0);
            setTopLeftPosition ((int) f.x, (int) f.y);
        }

        void addSubWindow()
        {
            NSWindow* pluginWindow = [((NSView*) getWindowHandle()) window];
            [pluginWindow setExcludedFromWindowsMenu: YES];
            [pluginWindow setCanHide: YES];

            [hostWindow addChildWindow: pluginWindow
                               ordered: NSWindowAbove];
            [hostWindow orderFront: nil];
            [pluginWindow orderFront: nil];
        }

        void resized()
        {
            Component* const child = getChildComponent (0);
            if (child != nullptr)
                child->setBounds (getLocalBounds());
        }

        void paint (Graphics&) {}

        void childBoundsChanged (Component*)
        {
            if (! recursive)
            {
                recursive = true;

                const int w = jmax (32, editor.getWidth());
                const int h = jmax (32, editor.getHeight());

                SizeControl (parentView, w, h);

                if (getWidth() != w || getHeight() != h)
                    setSize (w, h);

                editor.repaint();

                updateWindowPos();
                addSubWindow(); // (need this for AULab)

                recursive = false;
            }
        }

        bool keyPressed (const KeyPress& kp)
        {
            if (! kp.getModifiers().isCommandDown())
            {
                // If we have an unused keypress, move the key-focus to a host window
                // and re-inject the event..
                static NSTimeInterval lastEventTime = 0; // check we're not recursively sending the same event

                if (lastEventTime != [[NSApp currentEvent] timestamp])
                {
                    lastEventTime = [[NSApp currentEvent] timestamp];
                    [[hostWindow parentWindow] makeKeyWindow];
                    [NSApp postEvent: [NSApp currentEvent] atStart: YES];
                }
            }

            return false;
        }

    private:
        HIViewRef parentView;
        NSWindow* hostWindow;
        EditorCompHolder editor;
        bool recursive;
    };
};

#endif

//==============================================================================
#define JUCE_COMPONENT_ENTRYX(Class, Name, Suffix) \
extern "C" __attribute__((visibility("default"))) ComponentResult Name ## Suffix (ComponentParameters* params, Class* obj); \
extern "C" __attribute__((visibility("default"))) ComponentResult Name ## Suffix (ComponentParameters* params, Class* obj) \
{ \
    return ComponentEntryPoint<Class>::Dispatch(params, obj); \
}

#define JUCE_COMPONENT_ENTRY(Class, Name, Suffix) JUCE_COMPONENT_ENTRYX(Class, Name, Suffix)

JUCE_COMPONENT_ENTRY (JuceAU, JucePlugin_AUExportPrefix, Entry)

#if BUILD_AU_CARBON_UI
  JUCE_COMPONENT_ENTRY (JuceAUView, JucePlugin_AUExportPrefix, ViewEntry)
#endif

#endif