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// A CFPlugin MIDIDriver using a C interface to CFPlugin, but calling a C++ class to do the work.

#include "MIDIDriverClass.h"

// Implementation of the IUnknown QueryInterface function.

static HRESULT MIDIDriverQueryInterface(MIDIDriverRef ref, REFIID iid, LPVOID *ppv) 

{

    // Create a CoreFoundation UUIDRef for the requested interface.

    CFUUIDRef interfaceID = CFUUIDCreateFromUUIDBytes( NULL, iid );

#if V2_MIDI_DRIVER_SUPPORT

    if (CFEqual(interfaceID, kMIDIDriverInterface2ID)) {

        // If the MIDIDriverInterface was requested, bump the ref count,

        // set the ppv parameter equal to the instance, and

        // return good status.

        MIDIDriver *self = GetMIDIDriver(ref);

        self->mInterface->AddRef(ref);

        *ppv = &self->mInterface;

        CFRelease(interfaceID);

        self->mVersion = 2;

#if MIDI_WEAK_LINK_TO_V2_CALLS

        InitMIDIWeakLinks();

#endif

        return S_OK;

    }

#endif

#if V1_MIDI_DRIVER_SUPPORT

    // Test the requested ID against the valid interfaces.

    if (CFEqual(interfaceID, kMIDIDriverInterfaceID)) {

        // If the MIDIDriverInterface was requested, bump the ref count,

        // set the ppv parameter equal to the instance, and

        // return good status.

        MIDIDriver *self = GetMIDIDriver(ref);

        self->mInterface->AddRef(ref);

        *ppv = &self->mInterface;

        CFRelease(interfaceID);

        self->mVersion = 1;

        return S_OK;

    }

#endif

    if (CFEqual(interfaceID, IUnknownUUID)) {

        MIDIDriver *self = GetMIDIDriver(ref);

        self->mInterface->AddRef(ref);

        *ppv = &self->mInterface;

        CFRelease(interfaceID);

        return S_OK;

    }

    // Requested interface unknown, bail with error.

    *ppv = NULL;

    CFRelease(interfaceID);

    return E_NOINTERFACE;

}

// return value ppv is a pointer to a pointer to the interface

// Implementation of reference counting for this type.

// Whenever an interface is requested, bump the refCount for

// the instance. NOTE: returning the refcount is a convention

// but is not required so don't rely on it.

static ULONG MIDIDriverAddRef(MIDIDriverRef ref) 

{

    MIDIDriver *self = GetMIDIDriver(ref);

    return ++self->mRefCount;

}

// When an interface is released, decrement the refCount.

// If the refCount goes to zero, deallocate the instance.

static ULONG MIDIDriverRelease(MIDIDriverRef ref) 

{

    MIDIDriver *self = GetMIDIDriver(ref);

    if (--self->mRefCount == 0) {

        delete self;

        return 0;

    } else

        return self->mRefCount;

}

OSStatus    MIDIDriverFindDevices(MIDIDriverRef self, MIDIDeviceListRef devList)

{

    return GetMIDIDriver(self)->FindDevices(devList);

}

OSStatus    MIDIDriverStart(MIDIDriverRef self, MIDIDeviceListRef devList)

{

    return GetMIDIDriver(self)->Start(devList);

}

OSStatus    MIDIDriverStop(MIDIDriverRef self)

{

    return GetMIDIDriver(self)->Stop();

}

OSStatus    MIDIDriverConfigure(MIDIDriverRef self, MIDIDeviceRef device)

{

    return GetMIDIDriver(self)->Configure(device);

}

OSStatus    MIDIDriverSend(MIDIDriverRef self, const MIDIPacketList *pktlist, 

                void *destRefCon1, void *destRefCon2)

{

    return GetMIDIDriver(self)->Send(pktlist, destRefCon1, destRefCon2);

}

OSStatus    MIDIDriverEnableSource(MIDIDriverRef self, MIDIEndpointRef src, Boolean enabled)

{

    return GetMIDIDriver(self)->EnableSource(src, enabled);

}

OSStatus    MIDIDriverFlush(MIDIDriverRef self, MIDIEndpointRef dest, void *destRefCon1, void *destRefCon2)

{

    return GetMIDIDriver(self)->Flush(dest, destRefCon1, destRefCon2);

}

OSStatus    MIDIDriverMonitor(MIDIDriverRef self, MIDIEndpointRef dest, const MIDIPacketList *pktlist)

{

    return GetMIDIDriver(self)->Monitor(dest, pktlist);

}

// The MIDIDriverInterface function table.

static MIDIDriverInterface MIDIDriverInterfaceFtbl = {

    NULL, // Required padding for COM

    //

    // These are the required COM functions

    (HRESULT STDMETHODCALLTYPE (*)(void *, REFIID, LPVOID *))MIDIDriverQueryInterface,

    (ULONG STDMETHODCALLTYPE (*)(void *))MIDIDriverAddRef,

    (ULONG STDMETHODCALLTYPE (*)(void *))MIDIDriverRelease,

    //

    // These are the MIDIDriver methods

    MIDIDriverFindDevices,

    MIDIDriverStart,

    MIDIDriverStop,

    MIDIDriverConfigure,

    MIDIDriverSend,

    MIDIDriverEnableSource,

    MIDIDriverFlush,

    MIDIDriverMonitor

};

MIDIDriver::MIDIDriver(CFUUIDRef factoryID)

{

    // Point to the function table

    mInterface = &MIDIDriverInterfaceFtbl;

    // Retain and keep an open instance refcount for each factory.

    mFactoryID = factoryID;

    CFPlugInAddInstanceForFactory(factoryID);

    mRefCount = 1;

    mVersion = 0;

}

MIDIDriver::~MIDIDriver()

{

    if (mFactoryID) {

        CFPlugInRemoveInstanceForFactory(mFactoryID);

        // CFRelease(mFactoryID); this came from CFUUIDGetConstantUUIDWithBytes which

        // says that it is immortal and should never be released

    }

}