AppleDBDMAAudio.cpp   [plain text]


#define DEBUGTIMESTAMPS		FALSE

#include "AppleDBDMAAudio.h"

#include <IOKit/IOMemoryDescriptor.h>
#include <IOKit/audio/IOAudioDebug.h>

#include <IOKit/IOFilterInterruptEventSource.h>
#include <IOKit/IOWorkLoop.h>

#include "AudioHardwareUtilities.h"
#include "AppleiSubEngine.h"
#include "AppleOnboardAudio.h"

#pragma mark ------------------------ 
#pragma mark  Constants
#pragma mark ------------------------ 

#define kIOProcTimingCountCurrent 10
#define kIOProcTimingCountAverage 100

extern "C" {
extern vm_offset_t phystokv(vm_offset_t pa);
};

#define super IOAudioEngine

OSDefineMetaClassAndStructors(AppleDBDMAAudio, IOAudioEngine)

const int AppleDBDMAAudio::kDBDMADeviceIndex	= 0;
const int AppleDBDMAAudio::kDBDMAOutputIndex	= 1;
const int AppleDBDMAAudio::kDBDMAInputIndex		= 2;

const UInt32 AppleDBDMAAudio::kMaxBitWidth		= 32;

#pragma mark ------------------------ 
#pragma mark  IOAudioEngine Methods
#pragma mark ------------------------ 

//	DO NOT I/O LOG THIS METHOD!
bool AppleDBDMAAudio::filterInterrupt (int index) {
	UInt32 resultOut = 1;
    UInt32 resultIn = 1;
	
	// check to see if this interupt is because the DMA went bad
	if ( ioBaseDMAOutput ) {
		resultOut = IOGetDBDMAChannelStatus (ioBaseDMAOutput);
	}

	if (ioBaseDMAInput) {
		resultIn = IOGetDBDMAChannelStatus (ioBaseDMAInput) & kdbdmaActive;
	}

	if ( mHasOutput ) {
		if ( !(resultOut & kdbdmaActive) ) {
			mNeedToRestartDMA = TRUE;
		}
	}
	
	if ( mHasInput ) {
		if ( !(resultIn & kdbdmaActive) ) {
			mNeedToRestartDMA = TRUE;
		}
	}
	
	// test the takeTimeStamp :it will increment the fCurrentLoopCount and time stamp it with the time now
	takeTimeStamp ();
	
	//	[3305011]	begin {
	//	Increment the activity counter that can be viewed with the AOA Viewer to verify DMA operation
	mDmaInterruptCount++;
	mDmaRecoveryInProcess = FALSE;
	//	} end	[3305011]
	
    return false;
}

void AppleDBDMAAudio::free()
{
	debugIOLog (3, "+ AppleDBDMAAudio::free()");

    if (interruptEventSource) {
        interruptEventSource->release();
        interruptEventSource = 0;
    }
    
	if (NULL != mOutputStream) {
		mOutputStream->release ();
		mOutputStream = NULL;
	}

	if (NULL != mInputStream) {
		mInputStream->release ();
		mInputStream = NULL;
	}

	deallocateDMAMemory ();

	if (NULL != mOutputSampleBuffer) {
		void* temp = mOutputSampleBuffer;
		mOutputSampleBuffer = NULL;
		IOFreeAligned (temp, numBlocks * mMaxBlockSize);
	}
	if (NULL != mInputSampleBuffer) {
		void* temp = mInputSampleBuffer;
		mInputSampleBuffer = NULL;
		IOFreeAligned (temp, numBlocks * mMaxBlockSize);
	}

	if (NULL != mIntermediateOutputSampleBuffer) {
		IOFreeAligned (mIntermediateOutputSampleBuffer, numBlocks * mMaxBlockSize);
		mIntermediateOutputSampleBuffer = NULL;
	}

	if (NULL != mIntermediateInputSampleBuffer) {
		IOFreeAligned (mIntermediateInputSampleBuffer, numBlocks * mMaxBlockSize);
		mIntermediateInputSampleBuffer = NULL;
	}

    if (NULL != miSubProcessingParams.lowFreqSamples) {
        IOFree (miSubProcessingParams.lowFreqSamples, (numBlocks * blockSize) * sizeof (float));
    }

    if (NULL != miSubProcessingParams.highFreqSamples) {
        IOFree (miSubProcessingParams.highFreqSamples, (numBlocks * blockSize) * sizeof (float));
    }

	if (NULL != deviceFormats) {
		deviceFormats->release ();
		deviceFormats = NULL;
	}


    super::free();

	debugIOLog (3, "- AppleDBDMAAudio::free()");
}

UInt32 AppleDBDMAAudio::getCurrentSampleFrame()
{
	SInt32		curFrame;

	curFrame = ((AppleOnboardAudio *)audioDevice)->getCurrentSampleFrame () % getNumSampleFramesPerBuffer ();

	return curFrame;
}

bool AppleDBDMAAudio::init (OSDictionary *			properties,
								 PlatformInterface* inPlatformInterface,
                                 IOService *		theDeviceProvider,
                                 bool				hasInput,
                                 bool				hasOutput,
								 OSArray *			formatsArray,
                                 UInt32				nBlocks )
{
	Boolean					result;

	debugIOLog (3,  "+ AppleDBDMAAudio::init ( %X, %X, %d, %d, %X, %X )",
			(unsigned int)properties,
			(unsigned int)theDeviceProvider,
			(unsigned int)hasInput,
			(unsigned int)hasOutput,
			(unsigned int)formatsArray,
			(unsigned int)nBlocks);
			
	result = FALSE;
	
	mHasInput = hasInput;
	mHasOutput = hasOutput;
    
    mEnableCPUProfiling = FALSE;
    
	//	[3305011]	begin {
	//	Init the dma activity counter that can be viewed with AOA Viewer
	mDmaInterruptCount = 0;
	mLastDmaInterruptCount = 0;
	mNumberOfFrozenDmaInterruptCounts = 0;
	mDmaRecoveryInProcess = FALSE;
	//	} end	[3305011]

	// Ususal check
	FailIf (FALSE == super::init (NULL), Exit);
	FailIf (NULL == theDeviceProvider, Exit);
	FailIf (NULL == formatsArray, Exit);
	FailIf (NULL == inPlatformInterface, Exit);

	mPlatformObject = inPlatformInterface;
	deviceFormats = formatsArray;
	deviceFormats->retain ();

	mDeviceProvider = theDeviceProvider; // i2s-a

	//	There is a system I/O controller dependency here.  Keylargo systems describe the DMA channel registers
	//	as having separate sets for input versus output while K2 systems describe a block of memory that
	//	encapsulates both the input and output channel registers.  Since there is a system I/O controller
	//	dependency, it would seem prudent to move the acquisition of these addresses to the appropriate
	//	platform interface instance (i.e. K2 Platform Interface or Keylargo Platform Interface).
	
	ioBaseDMAOutput = hasOutput ? mPlatformObject->GetOutputChannelRegistersVirtualAddress ( mDeviceProvider ) : NULL ;
	if ( ( NULL == ioBaseDMAOutput ) && hasOutput ) {
		debugIOLog (3,  "  ioBaseDMAOutput = NULL" );
		FailIf ( true, Exit );
	}

	ioBaseDMAInput = hasInput ? mPlatformObject->GetInputChannelRegistersVirtualAddress ( mDeviceProvider ) : NULL ;
	if ( ( NULL == ioBaseDMAInput ) && hasInput ) {
		debugIOLog (3,  "  ioBaseDMAInput = NULL" );
		FailIf ( true, Exit );
	}
	debugIOLog (3,  "  ioBaseDMAOutput = %p", ioBaseDMAOutput );
	debugIOLog (3,  "  ioBaseDMAInput =  %p", ioBaseDMAInput );

	dmaCommandBufferIn = 0;
	dmaCommandBufferOut = 0;
	commandBufferSize = 0;
	interruptEventSource = 0;

	numBlocks = nBlocks;
	// blockSize will be init'ed when publishFormats calls stream->setFormat with the default format, which results in performFormatChange being called
	blockSize = 0;

	mMaxBlockSize = ( DBDMAAUDIODMAENGINE_ROOT_BLOCK_SIZE * ( kMaxBitWidth / 8 ) );

	mInputDualMonoMode = e_Mode_Disabled;		   
		   
	resetiSubProcessingState();
	
	mUseSoftwareInputGain = false;	
	mInputGainLPtr = NULL;	
	mInputGainRPtr = NULL;	

    
	mOutputIOProcCallCount = 0;
	mStartOutputIOProcUptime.hi = 0;
	mStartOutputIOProcUptime.lo = 0;
	mEndOutputProcessingUptime.hi = 0;
	mEndOutputProcessingUptime.lo = 0;
    mPauseOutputProcessingUptime.hi = 0;
    mPauseOutputProcessingUptime.lo = 0;
	mCurrentTotalOutputNanos = 0;
	mTotalOutputProcessingNanos = 0;
	mTotalOutputIOProcNanos = 0;
    mCurrentTotalPausedOutputNanos = 0;
    
    mInputIOProcCallCount = 0;
	mStartInputIOProcUptime.hi = 0;
	mStartInputIOProcUptime.lo = 0;
	mEndInputProcessingUptime.hi = 0;
	mEndInputProcessingUptime.lo = 0;
    mPauseInputProcessingUptime.hi = 0;
    mPauseInputProcessingUptime.lo = 0;
	mCurrentTotalInputNanos = 0;
	mTotalInputProcessingNanos = 0;
	mTotalInputIOProcNanos = 0;
    mCurrentTotalPausedInputNanos = 0;
	
    result = TRUE;

Exit:
	debugIOLog (3,  "- AppleDBDMAAudio::init returns %d", (unsigned int)result );
			
	return result;
}

bool AppleDBDMAAudio::initHardware (IOService *provider) {
    UInt32						interruptIndex = kDBDMADeviceIndex;
    IOWorkLoop *				workLoop;
	Boolean						result;

	debugIOLog (3, "+ AppleDBDMAAudio::initHardware ()");

	result = FALSE;
    FailIf (!super::initHardware (provider), Exit);

    ourProvider = (AppleOnboardAudio *)provider;
	mNeedToRestartDMA = FALSE;

	// create the streams, this will also cause the DMA programs to be created.
	result = publishStreamFormats ();
	FailIf (FALSE == result, Exit);

	setSampleOffset (kMinimumLatency);
	// blockSize was set by the call to publishStreamFormats
	setNumSampleFramesPerBuffer (numBlocks * blockSize / ((mDBDMAOutputFormat.fBitWidth / 8) * mDBDMAOutputFormat.fNumChannels));

	debugIOLog (3, "  AppleDBDMAAudio:: setNumSampleFramesPerBuffer(%lu)  numBlocks=%lu blockSize=%lu ",(numBlocks * blockSize / ((mDBDMAOutputFormat.fBitWidth / 8) * mDBDMAOutputFormat.fNumChannels)), numBlocks, blockSize);

	// install an interrupt handler only on the Output size of it !!! input only??
    workLoop = getWorkLoop();
    FailIf (!workLoop, Exit);

	debugIOLog (3, "  AppleDBDMAudio::initHardware() interrupt source's name = %s", mDeviceProvider->getName());	

	if ( mHasOutput ) {
		interruptIndex = kDBDMAOutputIndex;
	} else if ( mHasInput ) {
		interruptIndex = kDBDMAInputIndex;
	}
    interruptEventSource = IOFilterInterruptEventSource::filterInterruptEventSource(this,
																					AppleDBDMAAudio::interruptHandler,
																					AppleDBDMAAudio::interruptFilter,
																					mDeviceProvider,
																					interruptIndex);
    FailIf (!interruptEventSource, Exit);
    workLoop->addEventSource(interruptEventSource);
	// don't release interruptEventSource since we enable/disable it later

    iSubBufferMemory = NULL;
	iSubEngine = NULL;

	// Set up a control that sound prefs can set to tell us if we should install our notifier or not
	iSubAttach = IOAudioToggleControl::create (FALSE,
										kIOAudioControlChannelIDAll,
										kIOAudioControlChannelNameAll,
										0,
										kIOAudioToggleControlSubTypeiSubAttach,
										kIOAudioControlUsageOutput);

	// Don't release this control. We reference it when we terminate.
	if (NULL != iSubAttach) {
		addDefaultAudioControl (iSubAttach);
		iSubAttach->setValueChangeHandler ((IOAudioControl::IntValueChangeHandler)iSubAttachChangeHandler, this);
	}

	result = TRUE;

Exit:
	debugIOLog (3, "- AppleDBDMAAudio::initHardware() returns %d", result);
    return result;
}

AudioHardwareObjectInterface* AppleDBDMAAudio::getCurrentOutputPlugin () {
	AudioHardwareObjectInterface *		result = 0;
	
	FailIf ( 0 == ourProvider, Exit );
	result = ourProvider->getCurrentOutputPlugin ();
Exit:
	return result;
}

UInt32 AppleDBDMAAudio::GetEncodingFormat (OSString * theEncoding) {
	UInt32						sampleFormat;

	sampleFormat = 0x3F3F3F3F;			// because '????' is a trigraph....
	
	if (NULL != theEncoding) {
		if (theEncoding->isEqualTo ("PCM")) {
			sampleFormat = kIOAudioStreamSampleFormatLinearPCM;
		} else if (theEncoding->isEqualTo ("AC3")) {
			sampleFormat = kIOAudioStreamSampleFormat1937AC3;
		}
	}
	
	return sampleFormat;
}

bool AppleDBDMAAudio::updateOutputStreamFormats ()
{
	OSArray *							sampleRatesArray;
	OSDictionary *						formatDict;
	IOAudioSampleRate					sampleRate;
	IOAudioStreamFormat					dbdmaFormat;
    IOAudioStreamFormatExtension		dbdmaFormatExtension;
	UInt32								numFormats;
	UInt32								formatIndex;
	UInt32								rateIndex;
	UInt32								numSampleRates;
    UInt32                              engineState;
	bool								haveNonMixableFormat;
	bool								result;

	debugIOLog (3,  "+ AppleDBDMAAudio::updateOutputStreamFormats ()");

	result = FALSE;

	FailIf (NULL == mOutputStream, Exit);
    
    engineState = getState();
    debugIOLog (5, "AppleDBDMAAudio::updateOutputStreamFormats - about to try to pauseAudioEngine...engine state = %lu", engineState);
	if ( ( kIOAudioEngineRunning == engineState ) || ( kIOAudioEngineResumed == engineState ) ) {
        pauseAudioEngine ();
    }
	beginConfigurationChange ();

	mOutputStream->clearAvailableFormats (); 
	
	mDBDMAOutputFormat.fSampleFormat = kIOAudioStreamSampleFormatLinearPCM;
	mDBDMAInputFormat.fSampleFormat = kIOAudioStreamSampleFormatLinearPCM;
	mDBDMAInputFormat.fIsMixable = TRUE;

	dbdmaFormat.fNumericRepresentation = kIOAudioStreamNumericRepresentationSignedInt;
	dbdmaFormat.fAlignment = kIOAudioStreamAlignmentHighByte;
	dbdmaFormat.fByteOrder = kIOAudioStreamByteOrderBigEndian;
	dbdmaFormat.fIsMixable = true;
	dbdmaFormat.fDriverTag = 0;

	dbdmaFormatExtension.fVersion = kFormatExtensionCurrentVersion;
	dbdmaFormatExtension.fFlags = 0;

	sampleRate.fraction = 0;
	
	haveNonMixableFormat = FALSE;

	numFormats = deviceFormats->getCount ();
	debugIOLog (3,  "  numFormats = %ld", numFormats );
	for (formatIndex = 0; formatIndex < numFormats; formatIndex++) {
		debugIOLog (3, "  format index [%ld] --------------------", formatIndex);

		formatDict = OSDynamicCast (OSDictionary, deviceFormats->getObject (formatIndex));
		FailIf (NULL == formatDict, Exit);
		
		dbdmaFormat.fSampleFormat = GetEncodingFormat ((OSString *)formatDict->getObject (kEncoding));

		if ( kIOAudioStreamSampleFormat1937AC3 == dbdmaFormat.fSampleFormat)
		{
			debugIOLog ( 6, "  evaluating AC3 format" );
			if ( kGPIO_Unknown != mPlatformObject->getComboOutJackTypeConnected () )
			{
				debugIOLog ( 6, "  has a COMBO OUT jack" );
				if ( kGPIO_Connected != mPlatformObject->getDigitalOutConnected () )
				{
					// skip publishing encoded format as it is not an option
					debugIOLog (3, "  COMBO OUT jack is analog - skipping encoded format");
					continue;
				}
			}
		}

		dbdmaFormat.fNumChannels = ((OSNumber *)formatDict->getObject(kChannels))->unsigned32BitValue ();
		dbdmaFormat.fBitDepth = ((OSNumber *)formatDict->getObject(kBitDepth))->unsigned32BitValue ();
		dbdmaFormat.fBitWidth = ((OSNumber *)formatDict->getObject(kBitWidth))->unsigned32BitValue ();
		dbdmaFormat.fIsMixable = ((OSBoolean *)formatDict->getObject(kIsMixable))->getValue ();
		dbdmaFormatExtension.fFramesPerPacket = 1;
		dbdmaFormatExtension.fBytesPerPacket = dbdmaFormat.fNumChannels * (dbdmaFormat.fBitWidth / 8);

		debugIOLog (3, "  dbdmaFormat: fNumChannels = %d, fBitDepth = %d, fBitWidth = %d", (unsigned int)dbdmaFormat.fNumChannels, (unsigned int)dbdmaFormat.fBitDepth, (unsigned int)dbdmaFormat.fBitWidth);
		sampleRatesArray = OSDynamicCast (OSArray, formatDict->getObject (kSampleRates));
		FailIf (NULL == sampleRatesArray, Exit);
		numSampleRates = sampleRatesArray->getCount ();
		debugIOLog (4,  "  numSampleRates = %ld", numSampleRates );

		if ( kIOAudioStreamSampleFormat1937AC3 == dbdmaFormat.fSampleFormat ) {
			debugIOLog (3, "  sample format is kIOAudioStreamSampleFormat1937AC3");
			dbdmaFormatExtension.fFramesPerPacket = 1536;
			dbdmaFormatExtension.fBytesPerPacket = dbdmaFormatExtension.fFramesPerPacket * dbdmaFormat.fNumChannels * (dbdmaFormat.fBitWidth / 8);
		}

		for (rateIndex = 0; rateIndex < numSampleRates; rateIndex++) {
			sampleRate.whole = ((OSNumber *)sampleRatesArray->getObject(rateIndex))->unsigned32BitValue ();
			debugIOLog (4, "  dbdmaFormat: sampleRate.whole = %d", (unsigned int)sampleRate.whole);
			if ( mOutputStream ) {
				mOutputStream->addAvailableFormat (&dbdmaFormat, &dbdmaFormatExtension, &sampleRate, &sampleRate);
			}
			if ( mInputStream && kIOAudioStreamSampleFormatLinearPCM == dbdmaFormat.fSampleFormat ) {
				mInputStream->addAvailableFormat (&dbdmaFormat, &sampleRate, &sampleRate);
			}

			// [3730722] used cached values from previous format change recover our settings (which are lost when we clear the available formats to republish them when digital out connectors come and go)
			if (dbdmaFormat.fNumChannels == mPreviousDBDMAFormat.fNumChannels && dbdmaFormat.fBitDepth == mPreviousDBDMAFormat.fBitDepth && sampleRate.whole == mPreviousSampleRate && dbdmaFormat.fSampleFormat == mPreviousDBDMAFormat.fSampleFormat) {
				debugIOLog (4, "  using mPreviousDBDMAFormat");
				if ( mOutputStream)
				{
					mOutputStream->setFormat (&dbdmaFormat);
				}
				if ( mInputStream)
				{
					mInputStream->setFormat (&dbdmaFormat);
				}
				setSampleRate (&sampleRate);
				FailIf ( kIOReturnSuccess != ourProvider->formatChangeRequest (NULL, &sampleRate), Exit );	//	[3886091]
			} 

			// [3306295] all mixable formats get duplicated as non-mixable for hog mode
			if (dbdmaFormat.fIsMixable) {
				dbdmaFormat.fIsMixable = false;
				if (mOutputStream)
				{
					mOutputStream->addAvailableFormat (&dbdmaFormat, &dbdmaFormatExtension, &sampleRate, &sampleRate);
				}
				dbdmaFormat.fIsMixable = true;
			}
		}
		if (FALSE == dbdmaFormat.fIsMixable) {
			haveNonMixableFormat = TRUE;
		}
	}

	if (FALSE == haveNonMixableFormat) {
		mDBDMAOutputFormat.fIsMixable = TRUE;
	}
    
	completeConfigurationChange ();
    engineState = getState();
    debugIOLog (5, "AppleDBDMAAudio::updateOutputStreamFormats - about to try to resumeAudioEngine...engine state = %lu", engineState);
	if ( kIOAudioEnginePaused == engineState ) {
        resumeAudioEngine ();
		// [4238699]
		// resumeAudioEngine alone only puts IOAudioEngine in its kIOAudioEngineResumed state.  If an engine was running prior to this pause-resume
		// sequence, it might be possible to keep the engine in a resumed state indefinitely.  This can prevent audioEngineStopped from being called, even
		// if a sound has finished playing.  This is dangerous when running on battery power as it can prevent us from going idle.  By calling startAudioEngine,
		// we force the engine to issue a performAudioEngineStart, and the engine's state is set to running.  This allows audioEngineStopped to be called.
		//
		// Before calling startAudioEngine, check to make sure that the engine is in the resumed state.  This ensures that the audio engine will be started on only
		// the last resume call in cases where pause-resume sequences are nested.
		if ( kIOAudioEngineResumed == getState() ) {
            startAudioEngine ();
        }
    }

	result = TRUE;

Exit:
	debugIOLog (3,  "- AppleDBDMAAudio::updateStreamFormats () returns %d", result);

	return result;
}

bool AppleDBDMAAudio::isMixable () {
	return mDBDMAOutputFormat.fIsMixable;
}

bool AppleDBDMAAudio::publishStreamFormats (void) {
	OSArray *							sampleRatesArray;
	OSDictionary *						formatDict;
	IOAudioSampleRate					sampleRate;
	IOAudioStreamFormat					dbdmaFormat;
    IOAudioStreamFormatExtension		dbdmaFormatExtension;
	UInt32								numFormats;
	UInt32								formatIndex;
	UInt32								rateIndex;
	UInt32								numSampleRates;
	bool								result;

	result = FALSE;

	debugIOLog (3,  "+ AppleDBDMAAudio::publishStreamFormats ()");

	FailIf ( NULL == ourProvider, Exit );
	
    if (ioBaseDMAInput && mHasInput) {
		mInputStream = new IOAudioStream;
	}
	
	if ( ioBaseDMAOutput && mHasOutput ) {
		mOutputStream = new IOAudioStream;
	}
	
	FailIf ((mHasInput && !mInputStream) || (mHasOutput && !mOutputStream), Exit);

	if (mOutputStream) { 
		result = mOutputStream->initWithAudioEngine (this, kIOAudioStreamDirectionOutput, 1, 0, 0); 
		FailIf ( !result, Exit );
	}
	
	if (mInputStream) { 
		result = mInputStream->initWithAudioEngine (this, kIOAudioStreamDirectionInput, 1, 0, 0); 
		FailIf ( !result, Exit );
	}
	
	mDBDMAOutputFormat.fSampleFormat = kIOAudioStreamSampleFormatLinearPCM;
	mDBDMAInputFormat.fSampleFormat = kIOAudioStreamSampleFormatLinearPCM;
	mDBDMAInputFormat.fIsMixable = TRUE;

	dbdmaFormat.fNumericRepresentation = kIOAudioStreamNumericRepresentationSignedInt;
	dbdmaFormat.fAlignment = kIOAudioStreamAlignmentHighByte;
	dbdmaFormat.fByteOrder = kIOAudioStreamByteOrderBigEndian;
	dbdmaFormat.fIsMixable = true;
	dbdmaFormat.fDriverTag = 0;

	dbdmaFormatExtension.fVersion = kFormatExtensionCurrentVersion;
	dbdmaFormatExtension.fFlags = 0;

	sampleRate.fraction = 0;

	numFormats = deviceFormats->getCount ();
	debugIOLog (3,  "  numFormats = %ld", numFormats );
	for (formatIndex = 0; formatIndex < numFormats; formatIndex++) {
		debugIOLog (3, "  format index [%ld] --------------------", formatIndex);

		formatDict = OSDynamicCast (OSDictionary, deviceFormats->getObject (formatIndex));
		FailIf (NULL == formatDict, Exit);

		debugIOLog (3, "  kGPIO_Unknown != mPlatformObject->getComboOutJackTypeConnected() = %d", kGPIO_Unknown != mPlatformObject->getComboOutJackTypeConnected());
		debugIOLog (3, "  kGPIO_Connected != mPlatformObject->getDigitalOutConnected() = %d", kGPIO_Connected != mPlatformObject->getDigitalOutConnected());
		
		dbdmaFormat.fSampleFormat = GetEncodingFormat ((OSString *)formatDict->getObject (kEncoding));

		if ((kIOAudioStreamSampleFormat1937AC3 == dbdmaFormat.fSampleFormat) && (kGPIO_Unknown != mPlatformObject->getComboOutJackTypeConnected() && kGPIO_Connected != mPlatformObject->getDigitalOutConnected())) {
			// skip publishing encoded format as it is not an option
			debugIOLog (3, "  skipping encoded format");
			continue;
		}

		dbdmaFormat.fNumChannels = ((OSNumber *)formatDict->getObject(kChannels))->unsigned32BitValue ();
		dbdmaFormat.fBitDepth = ((OSNumber *)formatDict->getObject(kBitDepth))->unsigned32BitValue ();
		dbdmaFormat.fBitWidth = ((OSNumber *)formatDict->getObject(kBitWidth))->unsigned32BitValue ();
		dbdmaFormat.fIsMixable = ((OSBoolean *)formatDict->getObject(kIsMixable))->getValue ();
		dbdmaFormatExtension.fFramesPerPacket = 1;
		dbdmaFormatExtension.fBytesPerPacket = dbdmaFormat.fNumChannels * (dbdmaFormat.fBitWidth / 8);

		debugIOLog (3, "  dbdmaFormat: fNumChannels = %d, fBitDepth = %d, fBitWidth = %d", (unsigned int)dbdmaFormat.fNumChannels, (unsigned int)dbdmaFormat.fBitDepth, (unsigned int)dbdmaFormat.fBitWidth);
		sampleRatesArray = OSDynamicCast (OSArray, formatDict->getObject (kSampleRates));
		FailIf (NULL == sampleRatesArray, Exit);
		numSampleRates = sampleRatesArray->getCount ();
		debugIOLog (4,  "  numSampleRates = %ld", numSampleRates );

		if (kIOAudioStreamSampleFormat1937AC3 == dbdmaFormat.fSampleFormat) {
			debugIOLog (3, "  sample format is kIOAudioStreamSampleFormat1937AC3");
			dbdmaFormatExtension.fFramesPerPacket = 1536;
			dbdmaFormatExtension.fBytesPerPacket = dbdmaFormatExtension.fFramesPerPacket * dbdmaFormat.fNumChannels * (dbdmaFormat.fBitWidth / 8);
		}

		for (rateIndex = 0; rateIndex < numSampleRates; rateIndex++) {
			sampleRate.whole = ((OSNumber *)sampleRatesArray->getObject(rateIndex))->unsigned32BitValue ();
			debugIOLog (4, "  dbdmaFormat: sampleRate.whole = %d", (unsigned int)sampleRate.whole);
			if (mOutputStream) {
				mOutputStream->addAvailableFormat (&dbdmaFormat, &dbdmaFormatExtension, &sampleRate, &sampleRate);
			}
			if (mInputStream && kIOAudioStreamSampleFormatLinearPCM == dbdmaFormat.fSampleFormat) {
				mInputStream->addAvailableFormat (&dbdmaFormat, &sampleRate, &sampleRate);
			}
			// TO DO: Remove hardcoding of default format. Should be indicated in format plist entry.
			if ( dbdmaFormat.fNumChannels == 2 && dbdmaFormat.fBitDepth == 16 && sampleRate.whole == 44100 && kIOAudioStreamSampleFormatLinearPCM == dbdmaFormat.fSampleFormat )
			{
				debugIOLog (3, "  dbdmaFormat: mOutputStream->setFormat to 2, 16, 44100");
				if (mOutputStream) { mOutputStream->setFormat (&dbdmaFormat); }
				if (mInputStream) { mInputStream->setFormat (&dbdmaFormat); }
				setSampleRate (&sampleRate);
				FailIf ( kIOReturnSuccess != ourProvider->formatChangeRequest (NULL, &sampleRate), Exit );	//	[3886091]
			}
			
			// [3306295] all mixable formats get duplicated as non-mixable for hog mode
			if (dbdmaFormat.fIsMixable) {
				dbdmaFormat.fIsMixable = false;
				if (mOutputStream)
				{
					mOutputStream->addAvailableFormat (&dbdmaFormat, &dbdmaFormatExtension, &sampleRate, &sampleRate);
				}
				dbdmaFormat.fIsMixable = true;
			}
		}
	}

	if (mOutputStream) {
		addAudioStream (mOutputStream);
	}
	if (mInputStream) {
		addAudioStream (mInputStream);
	}
	
	ourProvider->notifyStreamFormatsPublished();		//  [3743041]
	result = TRUE;

Exit:
	debugIOLog (3,  "- AppleDBDMAAudio::publishStreamFormats () returns %d", result);

	return result;
}

void AppleDBDMAAudio::deallocateDMAMemory () {
    if (dmaCommandBufferOut && (commandBufferSize > 0)) {
        IOFreeAligned(dmaCommandBufferOut, commandBufferSize);
        dmaCommandBufferOut = NULL;
    }
    
    if (dmaCommandBufferIn && (commandBufferSize > 0)) {
        IOFreeAligned(dmaCommandBufferIn, commandBufferSize);
        dmaCommandBufferOut = NULL;
    }

	if (NULL != dmaCommandBufferOutMemDescriptor) {
		dmaCommandBufferOutMemDescriptor->release ();
		dmaCommandBufferOutMemDescriptor = NULL;
	}
	if (NULL != dmaCommandBufferInMemDescriptor) {
		dmaCommandBufferInMemDescriptor->release ();
		dmaCommandBufferInMemDescriptor = NULL;
	}	
	if (NULL != sampleBufferOutMemDescriptor) {
		sampleBufferOutMemDescriptor->release ();
		sampleBufferOutMemDescriptor = NULL;
	}
	if (NULL != sampleBufferInMemDescriptor) {
		sampleBufferInMemDescriptor->release ();
		sampleBufferInMemDescriptor = NULL;
	}
	if (NULL != stopCommandOutMemDescriptor) {
		stopCommandOutMemDescriptor->release ();
		stopCommandOutMemDescriptor = NULL;
	}
	if (NULL != stopCommandInMemDescriptor) {
		stopCommandInMemDescriptor->release ();
		stopCommandInMemDescriptor = NULL;
	}

	return;
}

void AppleDBDMAAudio::allocateDMABuffers (void) {

	debugIOLog (3, "  allocateDMABuffers: buffer size = %ld", numBlocks * mMaxBlockSize);

	if(ioBaseDMAOutput) {
		// integer sample buffer
		if (NULL == mOutputSampleBuffer) {
			mOutputSampleBuffer = IOMallocAligned(numBlocks * mMaxBlockSize, PAGE_SIZE);
			debugIOLog ( 3, "  allocated mOutputSampleBuffer %p", mOutputSampleBuffer );
		}
		// floating point copy buffer
		if (NULL == mIntermediateOutputSampleBuffer) {
			mIntermediateOutputSampleBuffer = IOMallocAligned(numBlocks * mMaxBlockSize, PAGE_SIZE);
			debugIOLog ( 3, "  allocated mIntermediateOutputSampleBuffer %p", mIntermediateOutputSampleBuffer );
		}
	}
	if(ioBaseDMAInput) {
		if (NULL == mInputSampleBuffer) {
			mInputSampleBuffer = IOMallocAligned(numBlocks * mMaxBlockSize, PAGE_SIZE);
			debugIOLog ( 3, "  allocated mInputSampleBuffer %p", mInputSampleBuffer );
		}
		// floating point copy buffer
		if (NULL == mIntermediateInputSampleBuffer) {
			mIntermediateInputSampleBuffer = IOMallocAligned(numBlocks * mMaxBlockSize, PAGE_SIZE);
			debugIOLog ( 3, "  allocated mIntermediateInputSampleBuffer", mIntermediateInputSampleBuffer );
		}
	}
}

bool AppleDBDMAAudio::allocateOutputDMADescriptors (void) {
	bool						result;

	result = FALSE;

	debugIOLog ( 6, "+ AppleDBDMAAudio::allocateOutputDMADescriptors ()" );
	
    commandBufferSize = (numBlocks + 1) * sizeof(IODBDMADescriptor);
	debugIOLog ( 6, "  commandBufferSize %d", commandBufferSize );
    dmaCommandBufferOut = (IODBDMADescriptor *)IOMallocAligned(commandBufferSize, 32);	// needs to be more than 4 byte aligned
    FailIf (!dmaCommandBufferOut, Exit);
	debugIOLog ( 6, "  dmaCommandBufferOut %p", dmaCommandBufferOut );

	dmaCommandBufferOutMemDescriptor = IOMemoryDescriptor::withAddress (dmaCommandBufferOut, commandBufferSize, kIODirectionOutIn);
	FailIf (NULL == dmaCommandBufferOutMemDescriptor, Exit);
	debugIOLog ( 6, "  dmaCommandBufferOutMemDescriptor %p", dmaCommandBufferOutMemDescriptor );

	sampleBufferOutMemDescriptor = IOMemoryDescriptor::withAddress (mOutputSampleBuffer, numBlocks * blockSize, kIODirectionOutIn);
	FailIf (NULL == sampleBufferOutMemDescriptor, Exit);
	debugIOLog ( 6, "  sampleBufferOutMemDescriptor %p", sampleBufferOutMemDescriptor );

	stopCommandOutMemDescriptor = IOMemoryDescriptor::withAddress (&dmaCommandBufferOut[numBlocks], sizeof (IODBDMADescriptor *), kIODirectionOutIn);
	FailIf (NULL == stopCommandOutMemDescriptor, Exit);
	debugIOLog ( 6, "  stopCommandOutMemDescriptor %p", stopCommandOutMemDescriptor );

	result = TRUE;

Exit:
	debugIOLog ( 6, "- AppleDBDMAAudio::allocateOutputDMADescriptors () returns %d", result );
	return result;
}

bool AppleDBDMAAudio::allocateInputDMADescriptors (void) {
	bool						result;

	result = FALSE;

	debugIOLog ( 6, "+ AppleDBDMAAudio::allocateInputDMADescriptors ()" );
	if(ioBaseDMAInput) {
		commandBufferSize = (numBlocks + 1) * sizeof(IODBDMADescriptor);	// needs to be more than 4 byte aligned
		debugIOLog ( 6, "  commandBufferSize %d", commandBufferSize );
		
		dmaCommandBufferIn = (IODBDMADescriptor *)IOMallocAligned(commandBufferSize, 32);	// needs to be more than 4 byte aligned
        FailIf (!dmaCommandBufferIn, Exit);
		debugIOLog ( 6, "  dmaCommandBufferIn %d", dmaCommandBufferIn );

		dmaCommandBufferInMemDescriptor = IOMemoryDescriptor::withAddress (dmaCommandBufferIn, commandBufferSize, kIODirectionOutIn);
		FailIf (NULL == dmaCommandBufferInMemDescriptor, Exit);
		debugIOLog ( 6, "  dmaCommandBufferInMemDescriptor %d", dmaCommandBufferInMemDescriptor );

		sampleBufferInMemDescriptor = IOMemoryDescriptor::withAddress (mInputSampleBuffer, numBlocks * blockSize, kIODirectionOutIn);
		FailIf (NULL == sampleBufferInMemDescriptor, Exit);
		debugIOLog ( 6, "  sampleBufferInMemDescriptor %d", sampleBufferInMemDescriptor );

		stopCommandInMemDescriptor = IOMemoryDescriptor::withAddress (&dmaCommandBufferIn[numBlocks], sizeof (IODBDMADescriptor *), kIODirectionOutIn);
		FailIf (NULL == stopCommandInMemDescriptor, Exit);
		debugIOLog ( 6, "  stopCommandInMemDescriptor %d", stopCommandInMemDescriptor );
	}

	result = TRUE;

Exit:
	debugIOLog ( 6, "- AppleDBDMAAudio::allocateInputDMADescriptors () returns %d", result );
	return result;
}

bool AppleDBDMAAudio::createDMAPrograms ( void ) {
	vm_offset_t					offset;
	IOPhysicalAddress			commandBufferPhys;
	IOPhysicalAddress			sampleBufferPhys;
	IOPhysicalAddress			stopCommandPhys;
	UInt32						dmaCommand;
	UInt32						blockNum;
	Boolean						doInterrupt;
	bool						result;

	result = FALSE;			// Didn't successfully create DMA program

	debugIOLog ( 6, "+ AppleDBDMAAudio::createDMAPrograms ()" );
	if ( NULL != ioBaseDMAOutput ) {
		offset = 0;
		dmaCommand = kdbdmaOutputMore;
		doInterrupt = false;
	
		result = allocateOutputDMADescriptors ();
		FailIf (FALSE == result, Exit);
	
		commandBufferPhys = dmaCommandBufferOutMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == commandBufferPhys, Exit);
		debugIOLog ( 6, "  commandBufferPhys %p", commandBufferPhys );

		sampleBufferPhys = sampleBufferOutMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == sampleBufferPhys, Exit);
		debugIOLog ( 6, "  sampleBufferPhys %p", sampleBufferPhys );

		stopCommandPhys = stopCommandOutMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == stopCommandPhys, Exit);
		debugIOLog ( 6, "  stopCommandPhys %p", stopCommandPhys );
	
		for (blockNum = 0; blockNum < numBlocks; blockNum++) {
			IOPhysicalAddress	cmdDest;
	
			if (offset >= PAGE_SIZE) {
				sampleBufferPhys = sampleBufferOutMemDescriptor->getPhysicalSegment (blockNum * blockSize, 0);
				FailIf (NULL == sampleBufferPhys, Exit);
				offset = 0;
			}
	
			// This code assumes that the size of the IODBDMADescriptor divides evenly into the page size
			// If this is the last block, branch to the first block
			if (blockNum == (numBlocks - 1)) {
				cmdDest = commandBufferPhys;
				doInterrupt = true;
			// Else if the next block starts on a page boundry, branch to it
			} else if ((((blockNum + 1) * sizeof(IODBDMADescriptor)) % PAGE_SIZE) == 0) {
				cmdDest = dmaCommandBufferOutMemDescriptor->getPhysicalSegment ((blockNum + 1) * sizeof(IODBDMADescriptor), 0);
				FailIf (NULL == cmdDest, Exit);
			// No branch in the common case
			} else {
				cmdDest = 0;
			}
	
			if (cmdDest) {
				IOMakeDBDMADescriptorDep(&dmaCommandBufferOut[blockNum],
										dmaCommand,
										kdbdmaKeyStream0,
										doInterrupt ? kdbdmaIntAlways : kdbdmaIntNever,
										kdbdmaBranchAlways,
										kdbdmaWaitNever,
										blockSize,
										sampleBufferPhys + offset,
										cmdDest);
			} else {
				IOMakeDBDMADescriptorDep(&dmaCommandBufferOut[blockNum],
										dmaCommand,
										kdbdmaKeyStream0,
										kdbdmaIntNever,
										kdbdmaBranchIfTrue,
										kdbdmaWaitNever,
										blockSize,
										sampleBufferPhys + offset,
										stopCommandPhys);
			}
			offset += blockSize;
		}
	
		IOMakeDBDMADescriptor(&dmaCommandBufferOut[blockNum],
							kdbdmaStop,
							kdbdmaKeyStream0,
							kdbdmaIntNever,
							kdbdmaBranchNever,
							kdbdmaWaitNever,
							0,
							0);
	}
    
	// create the DMA input code
    if(ioBaseDMAInput) {
		doInterrupt = false;
        offset = 0;
        dmaCommand = kdbdmaInputMore;    
        
		result = allocateInputDMADescriptors ();
		FailIf (FALSE == result, Exit);

		commandBufferPhys = dmaCommandBufferInMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == commandBufferPhys, Exit);
		sampleBufferPhys = sampleBufferInMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == sampleBufferPhys, Exit);
		stopCommandPhys = stopCommandInMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == stopCommandPhys, Exit);

        for (blockNum = 0; blockNum < numBlocks; blockNum++) {
			IOPhysicalAddress	cmdDest;

            if (offset >= PAGE_SIZE) {
				sampleBufferPhys = sampleBufferInMemDescriptor->getPhysicalSegment (blockNum * blockSize, 0);
				FailIf (NULL == sampleBufferPhys, Exit);
                offset = 0;
            }

                // This code assumes that the size of the IODBDMADescriptor 
                // divides evenly into the page size
                // If this is the last block, branch to the first block
            if (blockNum == (numBlocks - 1)) {
                cmdDest = commandBufferPhys;
                // Else if the next block starts on a page boundry, branch to it
				if ( NULL == ioBaseDMAOutput ) {
					doInterrupt = true;												//  [3514709] If input only then enable interrupt on input DMA
				}
            } else if ((((blockNum + 1) * sizeof(IODBDMADescriptor)) % PAGE_SIZE) == 0) {
				cmdDest = dmaCommandBufferInMemDescriptor->getPhysicalSegment ((blockNum + 1) * sizeof(IODBDMADescriptor), 0);
				FailIf (NULL == cmdDest, Exit);
                // No branch in the common case
            } else {
                cmdDest = 0;
            }

            if (cmdDest) {
                IOMakeDBDMADescriptorDep(&dmaCommandBufferIn[blockNum],
                                     dmaCommand,
                                     kdbdmaKeyStream0,
                                     doInterrupt ? kdbdmaIntAlways : kdbdmaIntNever,
                                     kdbdmaBranchAlways,
                                     kdbdmaWaitNever,
                                     blockSize,
                                     sampleBufferPhys + offset,
                                     cmdDest);
            } else {
                IOMakeDBDMADescriptorDep(&dmaCommandBufferIn[blockNum],
                                     dmaCommand,
                                     kdbdmaKeyStream0,
                                     kdbdmaIntNever,
                                     kdbdmaBranchIfTrue,
                                     kdbdmaWaitNever,
                                     blockSize,
                                     sampleBufferPhys + offset,
                                     stopCommandPhys);
            }
            offset += blockSize;
        }

        IOMakeDBDMADescriptor(&dmaCommandBufferIn[blockNum],
                          kdbdmaStop,
                          kdbdmaKeyStream0,
                          kdbdmaIntNever,
                          kdbdmaBranchNever,
                          kdbdmaWaitNever,
                          0,
                          0);

    }

	result = TRUE;

Exit:
	debugIOLog ( 6, "- AppleDBDMAAudio::createDMAPrograms () returns %d", result );
	return result;
}

bool AppleDBDMAAudio::interruptFilter(OSObject *owner, IOFilterInterruptEventSource *source)
{
    register AppleDBDMAAudio *dmaEngine = (AppleDBDMAAudio *)owner;
    bool result = true;

    if (dmaEngine) {
        result = dmaEngine->filterInterrupt(source->getIntIndex());
    }

    return result;
}

void AppleDBDMAAudio::interruptHandler(OSObject *owner, IOInterruptEventSource *source, int count)
{
    register AppleDBDMAAudio *dmaEngine = (AppleDBDMAAudio *)owner;

	if ( NULL != dmaEngine ) {
		dmaEngine->mInterruptActionCount++;
	}
    return;
}

IOReturn AppleDBDMAAudio::performAudioEngineStart()
{
	IOPhysicalAddress			commandBufferPhys;
	IOReturn					result;

	debugIOLog (3, "+ AppleDBDMAAudio::performAudioEngineStart() for AOA with mInstanceIndex of %ld", ourProvider->getAOAInstanceIndex());
	result = kIOReturnError;
	
    FailIf (!interruptEventSource, Exit);

	if ( kIOAudioDeviceActive != ourProvider->getPowerState () )
	{
		//	THE FOLLOWING 'IOLog' IS REQUIRED AND SHOULD NOT BE MOVED.  POWER MANAGEMENT
		//	VERIFICATION CAN ONLY BE PERFORMED USING THE SYSTEM LOG!  AOA Viewer can be 
		//	used to enable or disable kprintf power management logging messages.
		if ( ourProvider->getDoKPrintfPowerState () )
		{
			IOLog ( "AppleDBDMAAudio::performAudioEngineStart ( %d, 0 ) setting power state to ACTIVE\n", TRUE );
		}
		debugIOLog (3, "  AppleDBDMAAudio::performAudioEngineStart() calling doLocalChangeToActiveState");
		result = ourProvider->doLocalChangeToActiveState ( TRUE, 0 );
		FailIf ( kIOReturnSuccess != result, Exit );
	}
	
	if (ioBaseDMAOutput && dmaCommandBufferOut) {
		flush_dcache((vm_offset_t)dmaCommandBufferOut, commandBufferSize, false);
	}
    if (ioBaseDMAInput && dmaCommandBufferIn) {
        flush_dcache((vm_offset_t)dmaCommandBufferIn, commandBufferSize, false);
	}

	if ( NULL != mIntermediateInputSampleBuffer ) {
		bzero (mIntermediateInputSampleBuffer, numBlocks * blockSize * (sizeof (float) / (mDBDMAInputFormat.fBitWidth / 8)));
	}

	resetiSubProcessingState();

	*((UInt32 *)&mLastOutputSample) = 0;
	*((UInt32 *)&mLastInputSample) = 0;


    if (NULL != iSubEngine) {
		startiSub = TRUE;
		needToSync = TRUE;
    }

    interruptEventSource->enable();

	// add the time stamp take to test
    takeTimeStamp(false);

	debugIOLog (6, "  getNumSampleFramesPerBuffer %ld", getNumSampleFramesPerBuffer() );
	((AppleOnboardAudio *)audioDevice)->setCurrentSampleFrame (0);

	// start the input DMA first
    if (ioBaseDMAInput) {
        IOSetDBDMAChannelControl(ioBaseDMAInput, IOClearDBDMAChannelControlBits(kdbdmaS0));
        IOSetDBDMABranchSelect(ioBaseDMAInput, IOSetDBDMAChannelControlBits(kdbdmaS0));
		commandBufferPhys = dmaCommandBufferInMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == commandBufferPhys, Exit);
		IODBDMAStart(ioBaseDMAInput, (IODBDMADescriptor *)commandBufferPhys);
		debugIOLog (3, "  AppleDBDMAAudio::performAudioEngineStart - starting input DMA for AOA with mInstanceIndex of %ld", ourProvider->getAOAInstanceIndex());
	}
    
	if (ioBaseDMAOutput) {
		IOSetDBDMAChannelControl(ioBaseDMAOutput, IOClearDBDMAChannelControlBits(kdbdmaS0));
		IOSetDBDMABranchSelect(ioBaseDMAOutput, IOSetDBDMAChannelControlBits(kdbdmaS0));
		commandBufferPhys = dmaCommandBufferOutMemDescriptor->getPhysicalAddress ();
		FailIf (NULL == commandBufferPhys, Exit);
		IODBDMAStart(ioBaseDMAOutput, (IODBDMADescriptor *)commandBufferPhys);
		debugIOLog (3, "  AppleDBDMAAudio::performAudioEngineStart - starting output DMA for AOA with mInstanceIndex of %ld", ourProvider->getAOAInstanceIndex());
	}

	// start with the lastest user set volume before playback [3527440] aml
	if (TRUE == mUseSoftwareOutputVolume) {
		*((UInt32 *)mPreviousLeftVolume) = *((UInt32 *)mLeftVolume);
		*((UInt32 *)mPreviousRightVolume) = *((UInt32 *)mRightVolume);
	}

	dmaRunState = TRUE;				//	rbm 7.12.02	added for user client support
	result = kIOReturnSuccess;

    debugIOLog (3, "- AppleDBDMAAudio::performAudioEngineStart() returns %X", result);

Exit:
    return result;
}

IOReturn AppleDBDMAAudio::performAudioEngineStop()
{
    UInt16 attemptsToStop = kDBDMAAttemptsToStop; // [3282437], was 1000

    debugIOLog (3, "+ AppleDBDMAAudio::performAudioEngineStop() for AOA with mInstanceIndex of %ld", ourProvider->getAOAInstanceIndex());

    if (NULL != iSubEngine) {
        iSubEngine->StopiSub ();
        needToSync = TRUE;
    }

    if (!interruptEventSource) {
        return kIOReturnError;
    }

    interruptEventSource->disable();
        
	// stop the output
	if ( NULL != ioBaseDMAOutput ) {
		IOSetDBDMAChannelControl(ioBaseDMAOutput, IOSetDBDMAChannelControlBits(kdbdmaS0));
		while ((IOGetDBDMAChannelStatus(ioBaseDMAOutput) & kdbdmaActive) && (attemptsToStop--)) {
			eieio();
			IOSleep(1);
		}
	
		IODBDMAStop(ioBaseDMAOutput);
		IODBDMAReset(ioBaseDMAOutput);
	} else {
		debugIOLog (3,  "  AppleDBDMAAudio::performAudioEngineStop has no output" );
	}

	// stop the input
    if(ioBaseDMAInput){
		attemptsToStop = kDBDMAAttemptsToStop; // [3282437]
        IOSetDBDMAChannelControl(ioBaseDMAInput, IOSetDBDMAChannelControlBits(kdbdmaS0));
        while ((IOGetDBDMAChannelStatus(ioBaseDMAInput) & kdbdmaActive) && (attemptsToStop--)) {
            eieio();
            IOSleep(1);
        }

        IODBDMAStop(ioBaseDMAInput);
        IODBDMAReset(ioBaseDMAInput);
	} else {
		debugIOLog (3,  "  AppleDBDMAAudio::performAudioEngineStop has no input" );
    }
    
	dmaRunState = FALSE;				//	rbm 7.12.02	added for user client support
    interruptEventSource->enable();
    
    mOutputIOProcCallCount = 0;
    mStartOutputIOProcUptime.hi = 0;
    mStartOutputIOProcUptime.lo = 0;
    mEndOutputProcessingUptime.hi = 0;
    mEndOutputProcessingUptime.lo = 0;
    mPauseOutputProcessingUptime.hi = 0;
    mPauseOutputProcessingUptime.lo = 0;
    mCurrentTotalOutputNanos = 0;
    mTotalOutputProcessingNanos = 0;
    mTotalOutputIOProcNanos = 0;
    mCurrentTotalPausedOutputNanos = 0;
    
    mInputIOProcCallCount = 0;
    mStartInputIOProcUptime.hi = 0;
    mStartInputIOProcUptime.lo = 0;
    mEndInputProcessingUptime.hi = 0;
    mEndInputProcessingUptime.lo = 0;
    mPauseInputProcessingUptime.hi = 0;
    mPauseInputProcessingUptime.lo = 0;
    mCurrentTotalInputNanos = 0;
    mTotalInputProcessingNanos = 0;
    mTotalInputIOProcNanos = 0;        
    mCurrentTotalPausedInputNanos = 0;
    
    debugIOLog (3, "- AppleDBDMAAudio::performAudioEngineStop() for AOA with mInstanceIndex of %ld", ourProvider->getAOAInstanceIndex());
    return kIOReturnSuccess;
}

// This gets called when a new audio stream needs to be mixed into an already playing audio stream
void AppleDBDMAAudio::resetClipPosition (IOAudioStream *audioStream, UInt32 clipSampleFrame) {

	debugIOLog (3, " AppleDBDMAAudio::resetClipPosition (%p, %ld)", audioStream, clipSampleFrame);


	if ((NULL != iSubBufferMemory) && (NULL != iSubEngine)) {
				
		resetiSubProcessingState();

		*((UInt32 *)&mLastOutputSample) = 0;
		*((UInt32 *)&mLastInputSample) = 0;

        debugIOLog (3, "  +resetClipPosition: iSubBufferOffset=%ld, previousClippedToFrame=%ld, clipSampleFrame=%ld", miSubProcessingParams.iSubBufferOffset, previousClippedToFrame, clipSampleFrame);
        if (previousClippedToFrame < clipSampleFrame) {
			// Resetting the clip point backwards around the end of the buffer
			clipAdjustment = (getNumSampleFramesPerBuffer () - clipSampleFrame + previousClippedToFrame) * iSubEngine->GetNumChannels();
        } else {
			clipAdjustment = (previousClippedToFrame - clipSampleFrame) * iSubEngine->GetNumChannels();
        }
		#if DEBUGLOG
        if (clipAdjustment < kMinimumLatency) {
            debugIOLog (3, "  resetClipPosition: 44.1 clipAdjustment < min, clipAdjustment=%ld", clipAdjustment); 
        }                
		#endif
        clipAdjustment = (clipAdjustment * 1000) / ((1000 * getSampleRate()->whole) / iSubEngine->GetSampleRate());  
        miSubProcessingParams.iSubBufferOffset -= clipAdjustment;

		#if DEBUGLOG
        if (clipAdjustment > (iSubBufferMemory->getLength () / 2)) {
            debugIOLog (3, "  resetClipPosition: clipAdjustment > iSub buffer size, clipAdjustment=%ld", clipAdjustment); 
        }                
		#endif

        if (miSubProcessingParams.iSubBufferOffset < 0) {
			miSubProcessingParams.iSubBufferOffset += (iSubBufferMemory->getLength () / 2);	
			miSubProcessingParams.iSubLoopCount--;
        }

        previousClippedToFrame = clipSampleFrame;
        justResetClipPosition = TRUE;

        debugIOLog (3, "  -resetClipPosition: iSubBufferOffset=%ld, previousClippedToFrame=%ld", miSubProcessingParams.iSubBufferOffset, previousClippedToFrame);
    }
}

IOReturn AppleDBDMAAudio::restartDMA () {
	IOReturn					result;
	
	performAudioEngineStop ();
	performAudioEngineStart ();
	result = kIOReturnSuccess;

    return result;
}

void AppleDBDMAAudio::setSampleLatencies (UInt32 outputLatency, UInt32 inputLatency) {
	setOutputSampleLatency (outputLatency);
	setInputSampleLatency (inputLatency);
}

void AppleDBDMAAudio::stop(IOService *provider)
{
    IOWorkLoop *workLoop;
    
    debugIOLog (3, " + AppleDBDMAAudio[%p]::stop(%p)", this, provider);
    
    if (interruptEventSource) {
        workLoop = getWorkLoop();
        if (workLoop) {
            workLoop->removeEventSource(interruptEventSource);
        }
    }
 	
    if (NULL != iSubEngineNotifier) {
        iSubEngineNotifier->remove ();
		iSubEngineNotifier = NULL;
    }
   
    super::stop(provider);
    stopAudioEngine();
	
    debugIOLog (3, " - AppleDBDMAAudio[%p]::stop(%p)", this, provider);
}


void AppleDBDMAAudio::detach(IOService *provider)
{
	super::detach(provider);
    debugIOLog (3, " AppleDBDMAAudio::detach(%p)", provider);
}

OSString *AppleDBDMAAudio::getGlobalUniqueID()
{
    const char *className = NULL;
    const char *location = NULL;
    char *uniqueIDStr;
    OSString *localID = NULL;
    OSString *uniqueID = NULL;
    UInt32 uniqueIDSize;
    
	className = "Apple03DBDMAAudio";
    
	location = mDeviceProvider->getName();
    
    localID = getLocalUniqueID();
    
    uniqueIDSize = 3;
    
    if (className) {
        uniqueIDSize += strlen(className);
    }
    
    if (location) {
        uniqueIDSize += strlen(location);
    }
    
    if (localID) {
        uniqueIDSize += localID->getLength();
    }
        
    uniqueIDStr = (char *)IOMallocAligned(uniqueIDSize, sizeof (char));
    
    if (uniqueIDStr) {
		bzero(uniqueIDStr, uniqueIDSize);

        if (className) {
            sprintf(uniqueIDStr, "%s:", className);
        }
        
        if (location) {
            strcat(uniqueIDStr, location);
            strcat(uniqueIDStr, ":");
        }
        
        if (localID) {
            strcat(uniqueIDStr, localID->getCStringNoCopy());
            localID->release();
        }
        
		debugIOLog (3, "  getGlobalUniqueID = %s", uniqueIDStr);
        uniqueID = OSString::withCString(uniqueIDStr);
        
        IOFreeAligned(uniqueIDStr, uniqueIDSize);
    }

    return uniqueID;
}

#pragma mark ------------------------ 
#pragma mark  Conversion Routines
#pragma mark ------------------------ 

// [3094574] aml, pick the correct output conversion routine based on our current state
void AppleDBDMAAudio::chooseOutputClippingRoutinePtr()
{
	if (FALSE == mDBDMAOutputFormat.fIsMixable) { // [3281454], no iSub during encoded playback either
		mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipMemCopyToOutputStream;
		debugIOLog (3, " AppleDBDMAAudio::chooseOutputClippingRoutinePtr - using memcpy clip routine for non-mixable format.");
	} else {
		if ((NULL != iSubBufferMemory) && (NULL != iSubEngine)) {
			if (32 == mDBDMAOutputFormat.fBitWidth) {
				if (TRUE == fNeedsRightChanMixed) {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream32iSubMixRightChannel;
				} else {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream32iSub;
				}
			} else if (16 == mDBDMAOutputFormat.fBitWidth) {
				if (TRUE == fNeedsRightChanMixed) {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream16iSubMixRightChannel;
				} else {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream16iSub;
				}
			} else {
				debugIOLog (3, " AppleDBDMAAudio::chooseOutputClippingRoutinePtr - Non-supported output bit depth, iSub attached.");
			}	
		} else {
			if (32 == mDBDMAOutputFormat.fBitWidth) {
				if (TRUE == fNeedsRightChanMixed) {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream32MixRightChannel;
				} else {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream32;
				}
			} else if (16 == mDBDMAOutputFormat.fBitWidth) {
				if (TRUE == fNeedsRightChanMixed) {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream16MixRightChannel;
				} else {
					mClipAppleDBDMAToOutputStreamRoutine = &AppleDBDMAAudio::clipAppleDBDMAToOutputStream16;
				}
			} else {
				debugIOLog (3, " AppleDBDMAAudio::chooseOutputClippingRoutinePtr - Non-supported output bit depth.");
			}
		}
	}
}

// [3094574] aml, pick the correct input conversion routine based on our current state
void AppleDBDMAAudio::chooseInputConversionRoutinePtr() 
{
	if (32 == mDBDMAInputFormat.fBitWidth) {
		if (mUseSoftwareInputGain) {
			mConvertInputStreamToAppleDBDMARoutine = &AppleDBDMAAudio::convertAppleDBDMAFromInputStream32WithGain;
		} else {
			mConvertInputStreamToAppleDBDMARoutine = &AppleDBDMAAudio::convertAppleDBDMAFromInputStream32;
		}
	} else if (16 == mDBDMAInputFormat.fBitWidth) {
		if (mUseSoftwareInputGain) {
			mConvertInputStreamToAppleDBDMARoutine = &AppleDBDMAAudio::convertAppleDBDMAFromInputStream16WithGain;
		} else {
			if (e_Mode_CopyRightToLeft == mInputDualMonoMode) {
				mConvertInputStreamToAppleDBDMARoutine = &AppleDBDMAAudio::convertAppleDBDMAFromInputStream16CopyR2L;
			} else {
				mConvertInputStreamToAppleDBDMARoutine = &AppleDBDMAAudio::convertAppleDBDMAFromInputStream16;
			}
		}
	} else {
		debugIOLog (3, " AppleDBDMAAudio::chooseInputConversionRoutinePtr - Non-supported input bit depth!");
	}
}

IOReturn AppleDBDMAAudio::clipOutputSamples(const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream)
{
	IOReturn 			result;
	
	result = kIOReturnSuccess;
 
 	// if the DMA went bad restart it
	if (mNeedToRestartDMA) {
		mNeedToRestartDMA = FALSE;
		restartDMA ();
	}
    
	if (0 != numSampleFrames) {

		// [3094574] aml, use function pointer instead of if/else block - handles both iSub and non-iSub clipping cases.
		result = (*this.*mClipAppleDBDMAToOutputStreamRoutine)(mixBuf, sampleBuf, firstSampleFrame, numSampleFrames, streamFormat);
	}
    
	return result;
}

// [3094574] aml, use function pointer instead of if/else block
IOReturn AppleDBDMAAudio::convertInputSamples(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat, IOAudioStream *audioStream)
{
	IOReturn result;

 	// if the DMA went bad restart it
	if (mNeedToRestartDMA) {
		mNeedToRestartDMA = FALSE;
		restartDMA ();
	}
    
	result = (*this.*mConvertInputStreamToAppleDBDMARoutine)(sampleBuf, destBuf, firstSampleFrame, numSampleFrames, streamFormat);
    
	return result;
}

#pragma mark ------------------------ 
#pragma mark  Output Routines
#pragma mark ------------------------ 

inline void AppleDBDMAAudio::outputProcessing (float* inFloatBufferPtr, UInt32 inNumSamples) {
	if (mUseSoftwareOutputVolume) {
		volume (inFloatBufferPtr, inNumSamples, mLeftVolume, mRightVolume, mPreviousLeftVolume, mPreviousRightVolume);
	}
}

inline void AppleDBDMAAudio::setupOutputBuffer (const void *mixBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat) {
	float*			tempFloatPtr;

	mMixBufferPtr = (float *)mixBuf;
	tempFloatPtr = (float *)mixBuf+firstSampleFrame*streamFormat->fNumChannels;

	memcpy (mIntermediateOutputSampleBuffer, tempFloatPtr, numSampleFrames*streamFormat->fNumChannels*sizeof(float));
}

IOReturn AppleDBDMAAudio::clipMemCopyToOutputStream (const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
	UInt32			offset;
	UInt32			streamSize;

	streamSize = streamFormat->fNumChannels * (streamFormat->fBitWidth / 8);
	offset = firstSampleFrame * streamSize;

	memcpy ((UInt8 *)sampleBuf + offset, (UInt8 *)mixBuf, numSampleFrames * streamSize);
	return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Float32 to Native SInt16
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream16(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    SInt16	*outSInt16BufferPtr;
	UInt32	numSamples;

	numSamples = numSampleFrames*streamFormat->fNumChannels;
	outSInt16BufferPtr = (SInt16 *)sampleBuf+firstSampleFrame * streamFormat->fNumChannels;	

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);
    
    startOutputTiming();
    
	outputProcessing((float *)mIntermediateOutputSampleBuffer, numSamples);
	
    endOutputTiming();
    
	Float32ToNativeInt16( (float *)mIntermediateOutputSampleBuffer, outSInt16BufferPtr, numSamples );

    return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Float32 to Native SInt16, mix right and left channels and mute right
// assumes 2 channels
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream16MixRightChannel(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    SInt16	*outSInt16BufferPtr;
	UInt32	numSamples;
 
	numSamples = numSampleFrames*streamFormat->fNumChannels;
	outSInt16BufferPtr = (SInt16 *)sampleBuf+firstSampleFrame * streamFormat->fNumChannels;

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);
    
    startOutputTiming();
    
	outputProcessing((float *)mIntermediateOutputSampleBuffer, numSamples);
	
    endOutputTiming();
    
	mixAndMuteRightChannel( (float *)mIntermediateOutputSampleBuffer, (float *)mIntermediateOutputSampleBuffer, numSamples );

	Float32ToNativeInt16( (float *)mIntermediateOutputSampleBuffer, outSInt16BufferPtr, numSamples );

    return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Float32 to Native SInt32
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream32(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
	SInt32	*outSInt32BufferPtr;
	UInt32	numSamples;

	numSamples = numSampleFrames*streamFormat->fNumChannels;
	outSInt32BufferPtr = (SInt32 *)sampleBuf + firstSampleFrame * streamFormat->fNumChannels;

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);
    
    startOutputTiming();
    
	outputProcessing((float *)mIntermediateOutputSampleBuffer, numSamples);
    
    endOutputTiming();
    
	Float32ToNativeInt32( (float *)mIntermediateOutputSampleBuffer, outSInt32BufferPtr, numSamples );

    return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Float32 to Native SInt32, mix right and left channels and mute right
// assumes 2 channels
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream32MixRightChannel(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
	SInt32	*outSInt32BufferPtr;
	UInt32	numSamples;

	numSamples = numSampleFrames*streamFormat->fNumChannels;
	outSInt32BufferPtr = (SInt32 *)sampleBuf + firstSampleFrame * streamFormat->fNumChannels;

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);
    
    startOutputTiming();
    
	outputProcessing((float *)mIntermediateOutputSampleBuffer, numSamples);
    
    endOutputTiming();
    
	mixAndMuteRightChannel( (float *)mIntermediateOutputSampleBuffer, (float *)mIntermediateOutputSampleBuffer, numSamples );

	Float32ToNativeInt32( (float *)mIntermediateOutputSampleBuffer, outSInt32BufferPtr, numSamples );

    return kIOReturnSuccess;
}

#pragma mark ------------------------ 
#pragma mark  iSub Output Routines
#pragma mark ------------------------ 

// ------------------------------------------------------------------------
// Float32 to Native SInt16 with iSub, assumes 2 channel data
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream16iSub(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32 		maxSampleIndex, numSamples;
    SInt16*		outputBuf16;
	UInt32		sampleIndex;

	iSubSynchronize(firstSampleFrame, numSampleFrames);

	PreviousValues* filterState = &(miSubProcessingParams.filterState);
	PreviousValues* filterState2 = &(miSubProcessingParams.filterState2);
	iSubCoefficients* coefficients = &(miSubProcessingParams.coefficients);
	UInt32* loopCount = &(miSubProcessingParams.iSubLoopCount);
	SInt32* iSubBufferOffset = &(miSubProcessingParams.iSubBufferOffset);
	float* srcPhase = &(miSubProcessingParams.srcPhase);
	float* srcState = &(miSubProcessingParams.srcState);

	float* low = miSubProcessingParams.lowFreqSamples;
	UInt32 sampleRate = miSubProcessingParams.sampleRate;
	UInt32 adaptiveSampleRate = miSubProcessingParams.adaptiveSampleRate;
	SInt16* iSubBufferMemory = miSubProcessingParams.iSubBuffer;
	UInt32 iSubBufferLen = miSubProcessingParams.iSubBufferLen;
	UInt32 outputSampleRate = miSubProcessingParams.iSubFormat.outputSampleRate;

	numSamples = numSampleFrames * streamFormat->fNumChannels;
    maxSampleIndex = (firstSampleFrame + numSampleFrames) * streamFormat->fNumChannels;

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);

	StereoLowPass4thOrder ((float *)mIntermediateOutputSampleBuffer, &low[firstSampleFrame * streamFormat->fNumChannels], numSampleFrames, sampleRate, coefficients, filterState, filterState2);

	outputBuf16 = (SInt16 *)sampleBuf+firstSampleFrame * streamFormat->fNumChannels;
    
    startOutputTiming();
    
	outputProcessing ((float *)mIntermediateOutputSampleBuffer, numSamples);
    
    endOutputTiming();
    
	Float32ToNativeInt16( (float *)mIntermediateOutputSampleBuffer, outputBuf16, numSamples );

 	sampleIndex = (firstSampleFrame * streamFormat->fNumChannels);
	iSubDownSampleLinearAndConvert( low, srcPhase, srcState, adaptiveSampleRate, outputSampleRate, sampleIndex, maxSampleIndex, iSubBufferMemory, iSubBufferOffset, iSubBufferLen, loopCount );	

	updateiSubPosition(firstSampleFrame, numSampleFrames);
		
	return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Float32 to Native SInt16 with iSub, mix and mute right channel
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream16iSubMixRightChannel(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{

    UInt32 		sampleIndex, maxSampleIndex, numSamples;
    SInt16 *	outputBuf16;

	iSubSynchronize(firstSampleFrame, numSampleFrames);

	PreviousValues* filterState = &(miSubProcessingParams.filterState);
	PreviousValues* filterState2 = &(miSubProcessingParams.filterState2);
	iSubCoefficients* coefficients = &(miSubProcessingParams.coefficients);
	UInt32* loopCount = &(miSubProcessingParams.iSubLoopCount);
	SInt32* iSubBufferOffset = &(miSubProcessingParams.iSubBufferOffset);
	float* srcPhase = &(miSubProcessingParams.srcPhase);
	float* srcState = &(miSubProcessingParams.srcState);

	float* low = miSubProcessingParams.lowFreqSamples;
	UInt32 sampleRate = miSubProcessingParams.sampleRate;
	UInt32 adaptiveSampleRate = miSubProcessingParams.adaptiveSampleRate;
	SInt16* iSubBufferMemory = miSubProcessingParams.iSubBuffer;
	UInt32 iSubBufferLen = miSubProcessingParams.iSubBufferLen;
	UInt32 outputSampleRate = miSubProcessingParams.iSubFormat.outputSampleRate;

	numSamples = numSampleFrames * streamFormat->fNumChannels;
    maxSampleIndex = (firstSampleFrame + numSampleFrames) * streamFormat->fNumChannels;

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);

    // Filter audio into low and high buffers using a 24 dB/octave crossover
	StereoLowPass4thOrder ((float *)mIntermediateOutputSampleBuffer, &low[firstSampleFrame * streamFormat->fNumChannels], numSampleFrames, sampleRate, coefficients, filterState, filterState2);

	outputBuf16 = (SInt16 *)sampleBuf+firstSampleFrame * streamFormat->fNumChannels;
	mixAndMuteRightChannel( (float *)mIntermediateOutputSampleBuffer, (float *)mIntermediateOutputSampleBuffer, numSamples );
    
    startOutputTiming();
    
	outputProcessing ((float *)mIntermediateOutputSampleBuffer, numSamples);
    
    endOutputTiming();
    
	Float32ToNativeInt16( (float *)mIntermediateOutputSampleBuffer, outputBuf16, numSamples );

 	sampleIndex = (firstSampleFrame * streamFormat->fNumChannels);
	iSubDownSampleLinearAndConvert( low, srcPhase, srcState, adaptiveSampleRate, outputSampleRate, sampleIndex, maxSampleIndex, iSubBufferMemory, iSubBufferOffset, iSubBufferLen, loopCount );	
		
	updateiSubPosition(firstSampleFrame, numSampleFrames);
		
	return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Float32 to Native SInt32 with iSub, assumes 2 channel data
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream32iSub(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32 		sampleIndex, maxSampleIndex, numSamples;
    SInt32 *	outputBuf32;

	iSubSynchronize(firstSampleFrame, numSampleFrames);

	PreviousValues* filterState = &(miSubProcessingParams.filterState);
	PreviousValues* filterState2 = &(miSubProcessingParams.filterState2);
	iSubCoefficients* coefficients = &(miSubProcessingParams.coefficients);
	UInt32* loopCount = &(miSubProcessingParams.iSubLoopCount);
	SInt32* iSubBufferOffset = &(miSubProcessingParams.iSubBufferOffset);
	float* srcPhase = &(miSubProcessingParams.srcPhase);
	float* srcState = &(miSubProcessingParams.srcState);

	float* low = miSubProcessingParams.lowFreqSamples;
	UInt32 sampleRate = miSubProcessingParams.sampleRate;
	UInt32 adaptiveSampleRate = miSubProcessingParams.adaptiveSampleRate;
	SInt16* iSubBufferMemory = miSubProcessingParams.iSubBuffer;
	UInt32 iSubBufferLen = miSubProcessingParams.iSubBufferLen;
	UInt32 outputSampleRate = miSubProcessingParams.iSubFormat.outputSampleRate;

	numSamples = numSampleFrames * streamFormat->fNumChannels;
    maxSampleIndex = (firstSampleFrame + numSampleFrames) * streamFormat->fNumChannels;

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);

	StereoLowPass4thOrder ((float *)mIntermediateOutputSampleBuffer, &low[firstSampleFrame * streamFormat->fNumChannels], numSampleFrames, sampleRate, coefficients, filterState, filterState2);

	outputBuf32 = (SInt32 *)sampleBuf + firstSampleFrame * streamFormat->fNumChannels;
    
    startOutputTiming();
    
	outputProcessing ((float *)mIntermediateOutputSampleBuffer, numSamples);
    
    endOutputTiming();
    
	Float32ToNativeInt32( (float *)mIntermediateOutputSampleBuffer, outputBuf32, numSamples );

  	sampleIndex = (firstSampleFrame * streamFormat->fNumChannels);
	iSubDownSampleLinearAndConvert( low, srcPhase, srcState, adaptiveSampleRate, outputSampleRate, sampleIndex, maxSampleIndex, iSubBufferMemory, iSubBufferOffset, iSubBufferLen, loopCount );	
		
	updateiSubPosition(firstSampleFrame, numSampleFrames);

	return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Float32 to Native SInt32 with iSub, mix and mute right channel
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::clipAppleDBDMAToOutputStream32iSubMixRightChannel(const void *inFloatBufferPtr, void *sampleBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32 		sampleIndex, maxSampleIndex, numSamples;
    SInt32 *	outputBuf32;

	iSubSynchronize(firstSampleFrame, numSampleFrames);

	PreviousValues* filterState = &(miSubProcessingParams.filterState);
	PreviousValues* filterState2 = &(miSubProcessingParams.filterState2);
	iSubCoefficients* coefficients = &(miSubProcessingParams.coefficients);
	UInt32* loopCount = &(miSubProcessingParams.iSubLoopCount);
	SInt32* iSubBufferOffset = &(miSubProcessingParams.iSubBufferOffset);
	float* srcPhase = &(miSubProcessingParams.srcPhase);
	float* srcState = &(miSubProcessingParams.srcState);

	float* low = miSubProcessingParams.lowFreqSamples;
	UInt32 sampleRate = miSubProcessingParams.sampleRate;
	UInt32 adaptiveSampleRate = miSubProcessingParams.adaptiveSampleRate;
	SInt16* iSubBufferMemory = miSubProcessingParams.iSubBuffer;
	UInt32 iSubBufferLen = miSubProcessingParams.iSubBufferLen;
	UInt32 outputSampleRate = miSubProcessingParams.iSubFormat.outputSampleRate;

	numSamples = numSampleFrames * streamFormat->fNumChannels;
    maxSampleIndex = (firstSampleFrame + numSampleFrames) * streamFormat->fNumChannels;

	setupOutputBuffer (inFloatBufferPtr, firstSampleFrame, numSampleFrames, streamFormat);

	StereoLowPass4thOrder ((float *) mIntermediateOutputSampleBuffer, &low[firstSampleFrame * streamFormat->fNumChannels], numSampleFrames, sampleRate, coefficients, filterState, filterState2);

	outputBuf32 = (SInt32 *)sampleBuf + firstSampleFrame * streamFormat->fNumChannels;
	mixAndMuteRightChannel( (float *)mIntermediateOutputSampleBuffer, (float *)mIntermediateOutputSampleBuffer, numSamples );
    
    startOutputTiming();
    
	outputProcessing ((float *)mIntermediateOutputSampleBuffer, numSamples);
    
    endOutputTiming();
    
	Float32ToNativeInt32( (float *)mIntermediateOutputSampleBuffer, outputBuf32, numSamples );

 	sampleIndex = (firstSampleFrame * streamFormat->fNumChannels);
	iSubDownSampleLinearAndConvert( low, srcPhase, srcState, adaptiveSampleRate, outputSampleRate, sampleIndex, maxSampleIndex, iSubBufferMemory, iSubBufferOffset, iSubBufferLen, loopCount );	
		
	updateiSubPosition(firstSampleFrame, numSampleFrames);
		
	return kIOReturnSuccess;
}

#pragma mark ------------------------ 
#pragma mark  Input Routines
#pragma mark ------------------------ 

inline void AppleDBDMAAudio::inputProcessing (float* inFloatBufferPtr, UInt32 inNumSamples) {
}

// ------------------------------------------------------------------------
// Native SInt16 to Float32
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::convertAppleDBDMAFromInputStream16(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32		samplesToConvert;
    float*		floatDestBuf;
    SInt16*		inputBuf16;
	SInt32		currentSampleFrame;
	UInt32		targetSampleFrame;
	float*		convertAtPointer;
	float*		copyFromPointer;
	
	inputBuf16 = &(((SInt16 *)sampleBuf)[mLastSampleFrameConverted * streamFormat->fNumChannels]);
	convertAtPointer = (float *)mIntermediateInputSampleBuffer + mLastSampleFrameConverted * streamFormat->fNumChannels;

	currentSampleFrame = (mPlatformObject->getFrameCount () % numSampleFramesPerBuffer) - (kMinimumLatency >> 1);
	if (currentSampleFrame < 0) {
		currentSampleFrame += numSampleFramesPerBuffer;
	}
	targetSampleFrame = (UInt32)currentSampleFrame;

	if (targetSampleFrame > mLastSampleFrameConverted) {

		samplesToConvert = (targetSampleFrame - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32(inputBuf16, convertAtPointer, samplesToConvert, 16);
        
        startInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert); 
        
        endInputTiming();
        
	} else if (targetSampleFrame < mLastSampleFrameConverted) {

		samplesToConvert = (numSampleFramesPerBuffer - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32(inputBuf16, convertAtPointer, samplesToConvert, 16);
        
        startInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert);
        
        pauseInputTiming();
        
		samplesToConvert = targetSampleFrame * streamFormat->fNumChannels;
		inputBuf16 = (SInt16 *)sampleBuf;
		convertAtPointer = (float *)mIntermediateInputSampleBuffer;

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32(inputBuf16, convertAtPointer, samplesToConvert, 16);
        
        resumeInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert);
        
        endInputTiming();
	}
	
	debugIOLog (7, "  copy:\t\t%ld\t\t%ld\t\t%ld\n", firstSampleFrame, firstSampleFrame + numSampleFrames - 1, numSampleFrames);

    floatDestBuf = (float *)destBuf;
	copyFromPointer = &(((float *)mIntermediateInputSampleBuffer)[firstSampleFrame * streamFormat->fNumChannels]);

	memcpy(destBuf, copyFromPointer, numSampleFrames * streamFormat->fNumChannels * sizeof (float));

	mLastSampleFrameConverted = targetSampleFrame;

    return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Native SInt16 to Float32, copy the rigth sample to the left channel for
// older machines only.  Note that there is no 32 bit version of this  
// function because older hardware does not support it.
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::convertAppleDBDMAFromInputStream16CopyR2L(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32		samplesToConvert;
    float*		floatDestBuf;
    SInt16*		inputBuf16;
	SInt32		currentSampleFrame;
	UInt32		targetSampleFrame;
	float*		convertAtPointer;
	float*		copyFromPointer;
		
	inputBuf16 = &(((SInt16 *)sampleBuf)[mLastSampleFrameConverted * streamFormat->fNumChannels]);
	convertAtPointer = (float *)mIntermediateInputSampleBuffer + mLastSampleFrameConverted * streamFormat->fNumChannels;

	currentSampleFrame = mPlatformObject->getFrameCount () % numSampleFramesPerBuffer - (kMinimumLatency >> 1);
	if (currentSampleFrame < 0) {
		currentSampleFrame += numSampleFramesPerBuffer;
	}
	targetSampleFrame = (UInt32)currentSampleFrame;

	if (targetSampleFrame > mLastSampleFrameConverted) {

		samplesToConvert = (targetSampleFrame - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32CopyRightToLeft(inputBuf16, convertAtPointer, samplesToConvert, 16);
        
		startInputTiming();
        
        inputProcessing (convertAtPointer, samplesToConvert);
        
        endInputTiming();
        
	} else if (targetSampleFrame < mLastSampleFrameConverted) {

		samplesToConvert = (numSampleFramesPerBuffer - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32CopyRightToLeft(inputBuf16, convertAtPointer, samplesToConvert, 16);
        
        startInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert); 
        
        pauseInputTiming();
        
		samplesToConvert = targetSampleFrame * streamFormat->fNumChannels;
		inputBuf16 = (SInt16 *)sampleBuf;
		convertAtPointer = (float *)mIntermediateInputSampleBuffer;

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32CopyRightToLeft(inputBuf16, convertAtPointer, samplesToConvert, 16);
        
		resumeInputTiming();
        
        inputProcessing (convertAtPointer, samplesToConvert);
        
        endInputTiming();
	}
	
	debugIOLog (7, "  copy:\t\t%ld\t\t%ld\t\t%ld\n", firstSampleFrame, firstSampleFrame + numSampleFrames - 1, numSampleFrames);

    floatDestBuf = (float *)destBuf;
	copyFromPointer = &(((float *)mIntermediateInputSampleBuffer)[firstSampleFrame * streamFormat->fNumChannels]);

	memcpy(destBuf, copyFromPointer, numSampleFrames * streamFormat->fNumChannels * sizeof (float));

	mLastSampleFrameConverted = targetSampleFrame;

    return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Native SInt16 to Float32, with software input gain
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::convertAppleDBDMAFromInputStream16WithGain(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32		samplesToConvert;
    float*		floatDestBuf;
    SInt16*		inputBuf16;
	SInt32		currentSampleFrame;
	UInt32		targetSampleFrame;
	float*		convertAtPointer;
	float*		copyFromPointer;
		
	inputBuf16 = &(((SInt16 *)sampleBuf)[mLastSampleFrameConverted * streamFormat->fNumChannels]);
	convertAtPointer = (float *)mIntermediateInputSampleBuffer + mLastSampleFrameConverted * streamFormat->fNumChannels;

	currentSampleFrame = mPlatformObject->getFrameCount () % numSampleFramesPerBuffer - (kMinimumLatency >> 1);
	if (currentSampleFrame < 0) {
		currentSampleFrame += numSampleFramesPerBuffer;
	}
	targetSampleFrame = (UInt32)currentSampleFrame;

	if (targetSampleFrame > mLastSampleFrameConverted) {

		samplesToConvert = (targetSampleFrame - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32Gain(inputBuf16, convertAtPointer, samplesToConvert, 16, mInputGainLPtr, mInputGainRPtr);

		startInputTiming();
        
        inputProcessing (convertAtPointer, samplesToConvert); 
        
        endInputTiming();
        
	} else if (targetSampleFrame < mLastSampleFrameConverted) {

		samplesToConvert = (numSampleFramesPerBuffer - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32Gain(inputBuf16, convertAtPointer, samplesToConvert, 16, mInputGainLPtr, mInputGainRPtr);
        
        startInputTiming();
		
        inputProcessing (convertAtPointer, samplesToConvert);
        
        pauseInputTiming();
        
		samplesToConvert = targetSampleFrame * streamFormat->fNumChannels;
		inputBuf16 = (SInt16 *)sampleBuf;
		convertAtPointer = (float *)mIntermediateInputSampleBuffer;

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf16, inputBuf16 - (SInt16 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt16ToFloat32Gain(inputBuf16, convertAtPointer, samplesToConvert, 16, mInputGainLPtr, mInputGainRPtr);
        
        resumeInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert);
        
        endInputTiming();
	}
	
	debugIOLog (7, "  copy:\t\t%ld\t\t%ld\t\t%ld\n", firstSampleFrame, firstSampleFrame + numSampleFrames - 1, numSampleFrames);

    floatDestBuf = (float *)destBuf;
	copyFromPointer = &(((float *)mIntermediateInputSampleBuffer)[firstSampleFrame * streamFormat->fNumChannels]);

	memcpy(destBuf, copyFromPointer, numSampleFrames * streamFormat->fNumChannels * sizeof (float));

	mLastSampleFrameConverted = targetSampleFrame;

    return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Native SInt32 to Float32
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::convertAppleDBDMAFromInputStream32(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32		samplesToConvert;
    float*		floatDestBuf;
    SInt32*		inputBuf32;
	SInt32		currentSampleFrame;
	UInt32		targetSampleFrame;
	float*		convertAtPointer;
	float*		copyFromPointer;
		
	inputBuf32 = &(((SInt32 *)sampleBuf)[mLastSampleFrameConverted * streamFormat->fNumChannels]);
	convertAtPointer = (float *)mIntermediateInputSampleBuffer + mLastSampleFrameConverted * streamFormat->fNumChannels;

	currentSampleFrame = mPlatformObject->getFrameCount () % numSampleFramesPerBuffer - (kMinimumLatency >> 1);
	if (currentSampleFrame < 0) {
		currentSampleFrame += numSampleFramesPerBuffer;
	}
	targetSampleFrame = (UInt32)currentSampleFrame;

	if (targetSampleFrame > mLastSampleFrameConverted) {

		samplesToConvert = (targetSampleFrame - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld", inputBuf32, inputBuf32 - (SInt32 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt32ToFloat32(inputBuf32, convertAtPointer, samplesToConvert, 32);
        
        startInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert); 
        
        endInputTiming();
        
	} else if (targetSampleFrame < mLastSampleFrameConverted) {

		samplesToConvert = (numSampleFramesPerBuffer - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf32, inputBuf32 - (SInt32 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt32ToFloat32(inputBuf32, convertAtPointer, samplesToConvert, 32);
        
        startInputTiming();
		
        inputProcessing (convertAtPointer, samplesToConvert);
        
        pauseInputTiming();
        
		samplesToConvert = targetSampleFrame * streamFormat->fNumChannels;
		inputBuf32 = (SInt32 *)sampleBuf;
		convertAtPointer = (float *)mIntermediateInputSampleBuffer;

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf32, inputBuf32 - (SInt32 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt32ToFloat32(inputBuf32, convertAtPointer, samplesToConvert, 32);
        
        resumeInputTiming();
        
        inputProcessing (convertAtPointer, samplesToConvert);
        
        endInputTiming();
	}
	
	debugIOLog (7, "  copy:\t\t%ld\t\t%ld\t\t%ld\n", firstSampleFrame, firstSampleFrame + numSampleFrames - 1, numSampleFrames);

    floatDestBuf = (float *)destBuf;
	copyFromPointer = &(((float *)mIntermediateInputSampleBuffer)[firstSampleFrame * streamFormat->fNumChannels]);

	memcpy(destBuf, copyFromPointer, numSampleFrames * streamFormat->fNumChannels * sizeof (float));

	mLastSampleFrameConverted = targetSampleFrame;

    return kIOReturnSuccess;
}

// ------------------------------------------------------------------------
// Native SInt32 to Float32, with software input gain
// ------------------------------------------------------------------------
IOReturn AppleDBDMAAudio::convertAppleDBDMAFromInputStream32WithGain(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame, UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat)
{
    UInt32		samplesToConvert;
    float*		floatDestBuf;
    SInt32*		inputBuf32;
	SInt32		currentSampleFrame;
	UInt32		targetSampleFrame;
	float*		convertAtPointer;
	float*		copyFromPointer;
		
	inputBuf32 = &(((SInt32 *)sampleBuf)[mLastSampleFrameConverted * streamFormat->fNumChannels]);
	convertAtPointer = (float *)mIntermediateInputSampleBuffer + mLastSampleFrameConverted * streamFormat->fNumChannels;

	currentSampleFrame = mPlatformObject->getFrameCount () % numSampleFramesPerBuffer - (kMinimumLatency >> 1);
	if (currentSampleFrame < 0) {
		currentSampleFrame += numSampleFramesPerBuffer;
	}
	targetSampleFrame = (UInt32)currentSampleFrame;

	if (targetSampleFrame > mLastSampleFrameConverted) {

		samplesToConvert = (targetSampleFrame - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld", inputBuf32, inputBuf32 - (SInt32 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt32ToFloat32Gain(inputBuf32, convertAtPointer, samplesToConvert, 32, mInputGainLPtr, mInputGainRPtr);
        
        startInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert); 
        
        endInputTiming();
        
	} else if (targetSampleFrame < mLastSampleFrameConverted) {

		samplesToConvert = (numSampleFramesPerBuffer - mLastSampleFrameConverted) * streamFormat->fNumChannels;		

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf32, inputBuf32 - (SInt32 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt32ToFloat32Gain(inputBuf32, convertAtPointer, samplesToConvert, 32, mInputGainLPtr, mInputGainRPtr);
        
        startInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert);
        
        pauseInputTiming();
        
		samplesToConvert = targetSampleFrame * streamFormat->fNumChannels;
		inputBuf32 = (SInt32 *)sampleBuf;
		convertAtPointer = (float *)mIntermediateInputSampleBuffer;

		debugIOLog (7, "  convert:\t%p\t%ld\t%p\t%ld\t%ld\n", inputBuf32, inputBuf32 - (SInt32 *)sampleBuf, convertAtPointer, convertAtPointer - (float *)mIntermediateInputSampleBuffer, samplesToConvert);

		NativeInt32ToFloat32Gain(inputBuf32, convertAtPointer, samplesToConvert, 32, mInputGainLPtr, mInputGainRPtr);
        
        resumeInputTiming();
        
		inputProcessing (convertAtPointer, samplesToConvert);
        
        endInputTiming();
	}
	
	debugIOLog (7, "  copy:\t\t%ld\t\t%ld\t\t%ld\n", firstSampleFrame, firstSampleFrame + numSampleFrames - 1, numSampleFrames);

    floatDestBuf = (float *)destBuf;
	copyFromPointer = &(((float *)mIntermediateInputSampleBuffer)[firstSampleFrame * streamFormat->fNumChannels]);

	memcpy(destBuf, copyFromPointer, numSampleFrames * streamFormat->fNumChannels * sizeof (float));

	mLastSampleFrameConverted = targetSampleFrame;

    return kIOReturnSuccess;
}

#pragma mark ------------------------ 
#pragma mark  State Routines
#pragma mark ------------------------ 

void AppleDBDMAAudio::resetOutputClipOptions() {
	fNeedsRightChanMixed = false;
	
	chooseOutputClippingRoutinePtr ();
}

void AppleDBDMAAudio::resetInputClipOptions() {
	mInputDualMonoMode = e_Mode_Disabled;
	fNeedsRightChanDelayInput = false;

	chooseInputConversionRoutinePtr ();
}

void AppleDBDMAAudio::setOutputSignalProcessing (OSDictionary * inDictionary) {
}

void AppleDBDMAAudio::setInputSignalProcessing (OSDictionary * inDictionary) {
}

void AppleDBDMAAudio::enableOutputProcessing (void) {
}

void AppleDBDMAAudio::disableOutputProcessing (void) {
}

void AppleDBDMAAudio::enableInputProcessing (void) {
}

void AppleDBDMAAudio::disableInputProcessing (void) {
}

void AppleDBDMAAudio::setDualMonoMode(const DualMonoModeType inDualMonoMode) 
{ 
	mInputDualMonoMode = inDualMonoMode; 
	chooseInputConversionRoutinePtr();

	return;   	
}

void AppleDBDMAAudio::setInputGainL(UInt32 inGainL) 
{ 
    if (mInputGainLPtr == NULL) {        
        mInputGainLPtr = (float *)IOMalloc(sizeof(float));
    }
    inputGainConverter(inGainL, mInputGainLPtr);
	
    return;   
} 

void AppleDBDMAAudio::setInputGainR(UInt32 inGainR) 
{ 
    if (mInputGainRPtr == NULL) {        
        mInputGainRPtr = (float *)IOMalloc(sizeof(float));
    }
    inputGainConverter(inGainR, mInputGainRPtr);

    return;   
} 

void AppleDBDMAAudio::setRightChanMixed(const bool needsRightChanMixed)  
{
	fNeedsRightChanMixed = needsRightChanMixed;  
	chooseOutputClippingRoutinePtr();
	
	return;   
}

void AppleDBDMAAudio::setUseSoftwareInputGain(const bool inUseSoftwareInputGain) 
{     
	debugIOLog (3, " AppleDBDMAAudio::setUseSoftwareInputGain (%s)", inUseSoftwareInputGain ? "true" : "false");
	
	mUseSoftwareInputGain = inUseSoftwareInputGain;     	
	chooseInputConversionRoutinePtr();
	
	return;   
}

void AppleDBDMAAudio::setUseSoftwareOutputVolume(const bool inUseSoftwareOutputVolume, UInt32 inMinLinear, UInt32 inMaxLinear, SInt32 inMindB, SInt32 inMaxdB) 
{     
	debugIOLog (3, " AppleDBDMAAudio::setUseSoftwareOutputVolume (%s, %ld, %ld, %ld, %ld)", inUseSoftwareOutputVolume ? "true" : "false", inMinLinear, inMaxLinear, inMindB, inMaxdB);
	
	mMinVolumeLinear = inMinLinear;
	mMaxVolumeLinear = inMaxLinear;
	mMinVolumedB = inMindB;
	mMaxVolumedB = inMaxdB;
	
	mUseSoftwareOutputVolume = inUseSoftwareOutputVolume;     	
	
	return;   
}

void AppleDBDMAAudio::setOutputVolumeLeft(UInt32 inVolume) 
{ 
	debugIOLog (3, " AppleDBDMAAudio::setOutputVolumeLeft (%ld)", inVolume);

#ifndef TESTING_VOLUME_SCALING
    volumeConverter(inVolume, mMinVolumeLinear, mMaxVolumeLinear, mMinVolumedB, mMaxVolumedB, mLeftVolume);
#else
	float t1, t2, t3, t4, t5;
	char floatstr[128];

    volumeConverter(inVolume, mMinVolumeLinear, mMaxVolumeLinear, mMinVolumedB, mMaxVolumedB, mLeftVolume, &t1, &t2, &t3, &t4, &t5);

	float2string(mLeftVolume, floatstr);
	debugIOLog (1, "  mLeftVolume after conversion: %s", floatstr);

	float2string(&t1, floatstr);
	debugIOLog (1, "  min dB: %s", floatstr);
	float2string(&t2, floatstr);
	debugIOLog (1, "  max dB: %s", floatstr);
	float2string(&t3, floatstr);
	debugIOLog (1, "  slope: %s", floatstr);
	float2string(&t4, floatstr);
	debugIOLog (1, "  offset: %s", floatstr);
	float2string(&t5, floatstr);
	debugIOLog (1, "  volume dB: %s", floatstr);
#endif

    return;   
}

void AppleDBDMAAudio::setOutputVolumeRight(UInt32 inVolume) 
{ 
	debugIOLog (3, " AppleDBDMAAudio::setOutputVolumeRight (%ld)", inVolume);

#ifndef TESTING_VOLUME_SCALING
    volumeConverter(inVolume, mMinVolumeLinear, mMaxVolumeLinear, mMinVolumedB, mMaxVolumedB, mRightVolume);
#else
	float t1, t2, t3, t4, t5;
	char fstr[128];

    volumeConverter(inVolume, mMinVolumeLinear, mMaxVolumeLinear, mMinVolumedB, mMaxVolumedB, mRightVolume, &t1, &t2, &t3, &t4, &t5);

	float2string(mRightVolume, fstr);
	debugIOLog (1, "  mRightVolume after conversion: %s", fstr);
#endif

    return;   
}

#pragma mark ------------------------ 
#pragma mark  USER CLIENT SUPPORT
#pragma mark ------------------------ 

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::copyDMAStateAndFormat (DBDMAUserClientStructPtr outState) {
	
	outState->dmaRunState = dmaRunState;
	outState->numChannels = mDBDMAOutputFormat.fNumChannels;
	outState->sampleFormat = mDBDMAOutputFormat.fSampleFormat;
	outState->numericRepresentation = mDBDMAOutputFormat.fNumericRepresentation;
	outState->bitDepth = mDBDMAOutputFormat.fBitDepth;
	outState->bitWidth = mDBDMAOutputFormat.fBitWidth;
	outState->alignment = mDBDMAOutputFormat.fAlignment;
	outState->byteOrder = mDBDMAOutputFormat.fByteOrder;
	outState->isMixable = mDBDMAOutputFormat.fIsMixable;
	outState->driverTag = mDBDMAOutputFormat.fDriverTag;
	outState->needsPhaseInversion = false;
	outState->needsRightChanMixed = fNeedsRightChanMixed;
	outState->needsRightChanDelay = false;
	outState->needsBalanceAdjust = false;
	outState->inputDualMonoMode = mInputDualMonoMode;
	outState->useSoftwareInputGain = mUseSoftwareInputGain;
	//	[3305011]	begin {
	outState->dmaInterruptCount = mDmaInterruptCount;
	outState->dmaFrozenInterruptCount = mNumberOfFrozenDmaInterruptCounts;
	outState->dmaRecoveryInProcess = mDmaRecoveryInProcess;
	//	} end	[3305011]
	//	[3514079]	begin {
	outState->dmaStalledCount = mDmaStalledCount;
	outState->dmaHwDiedCount = mDmaHwDiedCount;
	outState->interruptActionCount = mInterruptActionCount;
	outState->hasInput = mHasInput;
	outState->hasOutput = mHasOutput;
	//	} end	[3514079]
	outState->inputGainL = NULL == mInputGainLPtr ? 0.0 : *mInputGainLPtr ;
	outState->inputGainR = NULL == mInputGainRPtr ? 0.0 : *mInputGainRPtr ;
	
	outState->dmaFlags = mUseSoftwareOutputVolume ? ( 1 << kDMA_FLAG_useSoftwareOutputVolume ) : ( 0 << kDMA_FLAG_useSoftwareOutputVolume );
	outState->softwareOutputLeftVolume = mLeftVolume[0];
	outState->softwareOutputRightVolume = mRightVolume[0];
	outState->softwareOutputMinimumVolume = mMinVolumedB;
	outState->softwareOutputMaximumVolume = mMaxVolumedB;
	
	return kIOReturnSuccess;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::setDMAStateAndFormat ( DBDMAUserClientStructPtr inState ) {
	IOReturn			result = kIOReturnBadArgument;
	
	//FailIf ( inState->softwareOutputLeftVolume > mMaxVolumedB, Exit );
	//FailIf ( inState->softwareOutputLeftVolume < mMinVolumedB, Exit );
	//FailIf ( inState->softwareOutputRightVolume > mMaxVolumedB, Exit );
	//FailIf ( inState->softwareOutputRightVolume < mMinVolumedB, Exit );
	mUseSoftwareOutputVolume = ( 0 != ( ( 1 << kDMA_FLAG_useSoftwareOutputVolume ) & inState->dmaFlags )) ? TRUE : FALSE ;
	
	if (inState && validateSoftwareVolumes(inState->softwareOutputLeftVolume,inState->softwareOutputRightVolume,mMaxVolumedB,mMinVolumedB)) {
		mLeftVolume[0] = inState->softwareOutputLeftVolume;
		mRightVolume[0] = inState->softwareOutputRightVolume;
		result = kIOReturnSuccess;
	}
	
	return result;
}


//	[3305011]	begin {
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::copyInputChannelCommands ( void * inputChannelCommands )
{
	IOReturn						result;
	UInt32							indexLimit;
	UCIODBDMAChannelCommandsPtr		ptr;
	
	result = kIOReturnError;
	if ( NULL != inputChannelCommands )
	{
		if ( NULL != dmaCommandBufferIn )
		{
			//	Limit size of transfer to user client buffer size
			ptr = (UCIODBDMAChannelCommandsPtr)inputChannelCommands;
			ptr->numBlocks = numBlocks;
			indexLimit = ( kUserClientStateStructSize - sizeof ( UInt32 ) ) / sizeof ( IODBDMADescriptor );
			if ( numBlocks < indexLimit )
			{
				indexLimit = numBlocks;
			}
			for ( UInt32 index = 0; index < indexLimit; index++ )
			{
				ptr->channelCommands[index].operation = dmaCommandBufferIn[index].operation;
				ptr->channelCommands[index].address = dmaCommandBufferIn[index].address;
				ptr->channelCommands[index].cmdDep = dmaCommandBufferIn[index].cmdDep;
				ptr->channelCommands[index].result = dmaCommandBufferIn[index].result;
			}
			result = kIOReturnSuccess;
		}
	}
	return result;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::copyInputChannelCommands1 ( void * inputChannelCommands )
{
	IOReturn						result;
	UInt32							indexLimit;
	IODBDMADescriptor *				ptr;
	
	result = kIOReturnError;
	if ( numBlocks >= 255 )
	{
		if ( NULL != inputChannelCommands )
		{
			if ( NULL != dmaCommandBufferIn )
			{
				//	Limit size of transfer to user client buffer size
				ptr = (IODBDMADescriptor*)inputChannelCommands;
				indexLimit = ( kUserClientStateStructSize / sizeof ( IODBDMADescriptor ) );
				if ( ( numBlocks - 255 ) < indexLimit )
				{
					indexLimit = ( numBlocks - 255 );
				}
				for ( UInt32 index = 0; index < indexLimit; index++ )
				{
					ptr[index].operation = dmaCommandBufferIn[index].operation;
					ptr[index].address = dmaCommandBufferIn[index].address;
					ptr[index].cmdDep = dmaCommandBufferIn[index].cmdDep;
					ptr[index].result = dmaCommandBufferIn[index].result;
				}
				result = kIOReturnSuccess;
			}
		}
	}
	return result;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	NOTE:  The DBDMA channel commands consist of four 32 bit words per command
//			as follows...
//
//			 ___________________
//			|                   |
//			| OPERATION         |
//			|___________________|
//			|                   |
//			| ADDRESS           |
//			|___________________|
//			|                   |
//			| COMMAND DEPENDENT |
//			|___________________|
//			|                   |
//			| RESULT            |
//			|___________________|
//
//	A typical implementation of the channel commands consists of 512 channel
//	commands while the maximum buffer size that can be transacted across the
//	user / client boundary is 4096 bytes.  This creates a situation where the
//	channel commands, plus the prefixed 32 bit integer representing a count of
//	channel commands, requires 8196 bytes.  Three separate user client transactions
//	are required to transact the channel commands.  This method only transacts
//	the count of channel commands and the first 255.75 commands.  Additional
//	methods are provided for acquiring the remainder of the channel command buffer.
//
//	The 'Operation' field consists of:
//	 _____ ___ _____ ___ ___ ___ ___ __________
//	|     |   |     |   |   |   |   |          |
//	| cmd | r | key | r | I | B | W | reqCount |
//	|  4  | 1 |  3  | 2 | 2 | 2 | 2 |    16    |
//	|_____|___|_____|___|___|___|___|__________|
//
//	The 'Result' field consists of:
//	 _____________ ______________
//	|             |              |
//	| Xfer Status | Result Count |
//	|      16     |       16     |
//	|_____________|______________|
//
//	Note that the 'operation' field is Little Endian
//
IOReturn AppleDBDMAAudio::copyOutputChannelCommands ( void * outputChannelCommands )
{
	IOReturn			result;
	UInt32				indexLimit;
	UCIODBDMAChannelCommandsPtr		ptr;
	
	result = kIOReturnError;
	if ( NULL != outputChannelCommands )
	{
		if ( NULL != dmaCommandBufferOut )
		{
			//	Limit size of transfer to user client buffer size
			ptr = (UCIODBDMAChannelCommandsPtr)outputChannelCommands;
			ptr->numBlocks = numBlocks;
			indexLimit = ( kUserClientStateStructSize - sizeof ( UInt32 ) ) / sizeof ( IODBDMADescriptor );
			if ( numBlocks < indexLimit )
			{
				indexLimit = numBlocks;
			}
			for ( UInt32 index = 0; index < indexLimit; index++ )
			{
				ptr->channelCommands[index].operation = dmaCommandBufferOut[index].operation;
				ptr->channelCommands[index].address = dmaCommandBufferOut[index].address;
				ptr->channelCommands[index].cmdDep = dmaCommandBufferOut[index].cmdDep;
				ptr->channelCommands[index].result = dmaCommandBufferOut[index].result;
			}
			result = kIOReturnSuccess;
		}
	}
	return result;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::copyOutputChannelCommands1 ( void * outputChannelCommands )
{
	IOReturn			result;
	UInt32				indexLimit;
	IODBDMADescriptor *	ptr;
	
	result = kIOReturnError;
	if ( numBlocks >= 255 )
	{
		if ( NULL != outputChannelCommands )
		{
			if ( NULL != dmaCommandBufferOut )
			{
				//	Limit size of transfer to user client buffer size
				ptr = (IODBDMADescriptor*)outputChannelCommands;
				indexLimit = ( kUserClientStateStructSize / sizeof ( IODBDMADescriptor ) );
				if ( ( numBlocks - 255 ) < indexLimit )
				{
					indexLimit = ( numBlocks - 255 );
				}
				for ( UInt32 index = 0; index < indexLimit; index++ )
				{
					ptr[index].operation = dmaCommandBufferOut[index+255].operation;
					ptr[index].address = dmaCommandBufferOut[index+255].address;
					ptr[index].cmdDep = dmaCommandBufferOut[index+255].cmdDep;
					ptr[index].result = dmaCommandBufferOut[index+255].result;
				}
				result = kIOReturnSuccess;
			}
		}
	}
	return result;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::copyInputChannelRegisters (void * outState)
{
	IOReturn			result;
	
	result = kIOReturnError;
	if ( NULL != outState )
	{
		if ( NULL != ioBaseDMAInput )
		{
			((IODBDMAChannelRegisters*)outState)->channelControl = OSReadLittleInt32( &ioBaseDMAInput->channelControl, 0 );
			((IODBDMAChannelRegisters*)outState)->channelStatus = OSReadLittleInt32( &ioBaseDMAInput->channelStatus, 0 );
			((IODBDMAChannelRegisters*)outState)->commandPtrHi = OSReadLittleInt32( &ioBaseDMAInput->commandPtrHi, 0 );
			((IODBDMAChannelRegisters*)outState)->commandPtrLo = OSReadLittleInt32( &ioBaseDMAInput->commandPtrLo, 0 );
			((IODBDMAChannelRegisters*)outState)->interruptSelect = OSReadLittleInt32( &ioBaseDMAInput->interruptSelect, 0 );
			((IODBDMAChannelRegisters*)outState)->branchSelect = OSReadLittleInt32( &ioBaseDMAInput->branchSelect, 0 );
			((IODBDMAChannelRegisters*)outState)->waitSelect = OSReadLittleInt32( &ioBaseDMAInput->waitSelect, 0 );
			((IODBDMAChannelRegisters*)outState)->transferModes = OSReadLittleInt32( &ioBaseDMAInput->transferModes, 0 );
			((IODBDMAChannelRegisters*)outState)->data2PtrHi = OSReadLittleInt32( &ioBaseDMAInput->data2PtrHi, 0 );
			((IODBDMAChannelRegisters*)outState)->data2PtrLo = OSReadLittleInt32( &ioBaseDMAInput->data2PtrLo, 0 );
			((IODBDMAChannelRegisters*)outState)->addressHi = OSReadLittleInt32( &ioBaseDMAInput->addressHi, 0 );
			result = kIOReturnSuccess;
		}
	}
	return result;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::copyOutputChannelRegisters (void * outState)
{
	IOReturn			result;
	
	result = kIOReturnError;
	if ( NULL != outState )
	{
		if ( NULL != ioBaseDMAOutput )
		{
			((IODBDMAChannelRegisters*)outState)->channelControl = OSReadLittleInt32( &ioBaseDMAOutput->channelControl, 0 );
			((IODBDMAChannelRegisters*)outState)->channelStatus = OSReadLittleInt32( &ioBaseDMAOutput->channelStatus, 0 );
			((IODBDMAChannelRegisters*)outState)->commandPtrHi = OSReadLittleInt32( &ioBaseDMAOutput->commandPtrHi, 0 );
			((IODBDMAChannelRegisters*)outState)->commandPtrLo = OSReadLittleInt32( &ioBaseDMAOutput->commandPtrLo, 0 );
			((IODBDMAChannelRegisters*)outState)->interruptSelect = OSReadLittleInt32( &ioBaseDMAOutput->interruptSelect, 0 );
			((IODBDMAChannelRegisters*)outState)->branchSelect = OSReadLittleInt32( &ioBaseDMAOutput->branchSelect, 0 );
			((IODBDMAChannelRegisters*)outState)->waitSelect = OSReadLittleInt32( &ioBaseDMAOutput->waitSelect, 0 );
			((IODBDMAChannelRegisters*)outState)->transferModes = OSReadLittleInt32( &ioBaseDMAOutput->transferModes, 0 );
			((IODBDMAChannelRegisters*)outState)->data2PtrHi = OSReadLittleInt32( &ioBaseDMAOutput->data2PtrHi, 0 );
			((IODBDMAChannelRegisters*)outState)->data2PtrLo = OSReadLittleInt32( &ioBaseDMAOutput->data2PtrLo, 0 );
			((IODBDMAChannelRegisters*)outState)->addressHi = OSReadLittleInt32( &ioBaseDMAOutput->addressHi, 0 );
			result = kIOReturnSuccess;
		}
	}
	return result;
}
//	} end	[3305011]


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::setInputChannelRegisters (void * inState) {
	IOReturn			result;
	
	result = kIOReturnError;
	if ( NULL != inState ) {
		if ( NULL != ioBaseDMAInput ) {
			OSWriteLittleInt32 ( (volatile void *)&ioBaseDMAInput->channelControl, 0, ((IODBDMAChannelRegisters*)inState)->channelControl );
			result = kIOReturnSuccess;
		}
	}
	return result;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
IOReturn AppleDBDMAAudio::setOutputChannelRegisters (void * inState) {
	IOReturn			result;
	
	result = kIOReturnError;
	if ( NULL != inState ) {
		if ( NULL != ioBaseDMAOutput ) {
			OSWriteLittleInt32 ( (volatile void *)&ioBaseDMAOutput->channelControl, 0, ((IODBDMAChannelRegisters*)inState)->channelControl );
			result = kIOReturnSuccess;
		}
	}
	return result;
}


#pragma mark ------------------------ 
#pragma mark  Format Routines
#pragma mark ------------------------ 

bool AppleDBDMAAudio::getDmaState (void )
{
	return dmaRunState;
}

IOReturn AppleDBDMAAudio::performFormatChange(IOAudioStream *audioStream, const IOAudioStreamFormat *newFormat, const IOAudioSampleRate *newSampleRate)
{
	Boolean						wasPoweredDown;
	IOReturn					result;
	
	result = kIOReturnError;
	
	debugIOLog (3, "+ AppleDBDMAAudio::performFormatChange (%p, %p, %p)", audioStream, newFormat, newSampleRate);	
	
	FailIf ( 0 == ourProvider, Exit );
	
	//	[3945202]	If 'performFormatChange' is invoked then the hardware must be awakened.  This is especially true
	//	of the TAS3004 which cannot have the format applied if in sleep mode.
	
	if ( kIOAudioDeviceActive != ourProvider->getPowerState () )
	{
		//	THE FOLLOWING 'IOLog' IS REQUIRED AND SHOULD NOT BE MOVED.  POWER MANAGEMENT
		//	VERIFICATION CAN ONLY BE PERFORMED USING THE SYSTEM LOG!  AOA Viewer can be 
		//	used to enable or disable kprintf power management logging messages.
		if ( ourProvider->getDoKPrintfPowerState () )
		{
			IOLog ( "AppleDBDMAAudio::performFormatChange ( %d, %p ) setting power state to ACTIVE\n", TRUE, &wasPoweredDown );
		}
	}
	result = ourProvider->doLocalChangeToActiveState ( TRUE, &wasPoweredDown );
	FailIf ( kIOReturnSuccess != result, Exit );
	
	// [3656784] verify that this is a valid format change before updating everything below - right now this just checks
	// if an encoded format is valid based on digital out connection states.  Other format info is validated by IOAudioFamily
	// and by the list we publish and doesn't need to be checked again. aml
	if (audioStream == mOutputStream) {
		result = ourProvider->validateOutputFormatChangeRequest (newFormat, newSampleRate);
	} else {
		result = ourProvider->validateInputFormatChangeRequest (newFormat, newSampleRate);
	}
	if (kIOReturnSuccess == result) {
		if ( NULL != newFormat ) {	
			debugIOLog (3, "  user commands us to switch to format '%4s'", (char *)&newFormat->fSampleFormat);

			// [3730722] capture the previous non-encoded formats so we can return to them when jack state changes update us from encoded back to analog
			if (kIOAudioStreamSampleFormat1937AC3 == newFormat->fSampleFormat) {
				mPreviousDBDMAFormat.fNumChannels = mDBDMAOutputFormat.fNumChannels;
				mPreviousDBDMAFormat.fBitDepth = mDBDMAOutputFormat.fBitDepth;
				mPreviousDBDMAFormat.fSampleFormat = mDBDMAOutputFormat.fSampleFormat;
				mPreviousSampleRate = sampleRate.whole; 
				debugIOLog (4, "  mPrevious format set to : %ld, %ld, %4s, %ld", mPreviousDBDMAFormat.fNumChannels, mPreviousDBDMAFormat.fBitDepth, &(mPreviousDBDMAFormat.fSampleFormat), mPreviousSampleRate);
			} else {
				mPreviousDBDMAFormat.fNumChannels = newFormat->fNumChannels;
				mPreviousDBDMAFormat.fBitDepth = newFormat->fBitDepth;
				mPreviousDBDMAFormat.fSampleFormat = newFormat->fSampleFormat;
				if (NULL != newSampleRate) {
					mPreviousSampleRate = newSampleRate->whole; 
				}
				debugIOLog (4, "  mPrevious format set to : %ld, %ld, %4s, %ld", mPreviousDBDMAFormat.fNumChannels, mPreviousDBDMAFormat.fBitDepth, &(mPreviousDBDMAFormat.fSampleFormat), mPreviousSampleRate);
			}
			
			if (audioStream == mOutputStream)
			{
				mDBDMAOutputFormat.fSampleFormat = newFormat->fSampleFormat;
			}

			mDBDMAOutputFormat.fNumChannels = newFormat->fNumChannels;
			mDBDMAOutputFormat.fNumericRepresentation = newFormat->fNumericRepresentation;
			mDBDMAOutputFormat.fBitDepth = newFormat->fBitDepth;
			mDBDMAOutputFormat.fAlignment = newFormat->fAlignment;
			mDBDMAOutputFormat.fByteOrder = newFormat->fByteOrder;
			mDBDMAOutputFormat.fIsMixable = newFormat->fIsMixable;
			mDBDMAOutputFormat.fDriverTag = newFormat->fDriverTag;

			mDBDMAInputFormat.fNumChannels = newFormat->fNumChannels;
			mDBDMAInputFormat.fNumericRepresentation = newFormat->fNumericRepresentation;
			mDBDMAInputFormat.fBitDepth = newFormat->fBitDepth;
			mDBDMAInputFormat.fAlignment = newFormat->fAlignment;
			mDBDMAInputFormat.fByteOrder = newFormat->fByteOrder;
			mDBDMAInputFormat.fDriverTag = newFormat->fDriverTag;

			// Always keep the input and output bit depths the same
			if (mDBDMAOutputFormat.fBitWidth != newFormat->fBitWidth) {
				debugIOLog (3, "  changing bit width");

				blockSize = ( DBDMAAUDIODMAENGINE_ROOT_BLOCK_SIZE * ( newFormat->fBitWidth / 8 ) );

				mDBDMAOutputFormat.fBitWidth = newFormat->fBitWidth;
				mDBDMAInputFormat.fBitWidth = newFormat->fBitWidth;

				// If you switch to something other than 16 bit, then you can't do AC-3 for output.
				if (mDBDMAOutputFormat.fBitWidth != 16) {
					mDBDMAOutputFormat.fSampleFormat = kIOAudioStreamSampleFormatLinearPCM;
				}

				deallocateDMAMemory ();
				allocateDMABuffers ();

				if (ioBaseDMAOutput) {
					FailIf (NULL == mOutputSampleBuffer, Exit);
				}
				if (ioBaseDMAInput) {
					FailIf (NULL == mInputSampleBuffer, Exit);
				}
				
				if (mOutputStream) {
					mOutputStream->setSampleBuffer ((void *)mOutputSampleBuffer, numBlocks * blockSize);
				}
				if (mInputStream) {
					mInputStream->setSampleBuffer ((void *)mInputSampleBuffer, numBlocks * blockSize);
				}

				FailIf (FALSE == createDMAPrograms (), Exit);
			}
		}

		if (audioStream != mInputStream && NULL != mInputStream) {
			mInputStream->hardwareFormatChanged (&mDBDMAInputFormat);
		} else if (audioStream != mOutputStream && NULL != mOutputStream) {
			mOutputStream->hardwareFormatChanged (&mDBDMAOutputFormat);
		}

		if (NULL != newSampleRate) {
			if (newSampleRate->whole != sampleRate.whole) {
				UInt32			newSampleOffset;

				debugIOLog (3, "  changing sample rate");
				updateDSPForSampleRate (newSampleRate->whole);
				// update iSub coefficients for new sample rate
				if ((NULL != iSubBufferMemory) && (NULL != iSubEngine)) {
					debugIOLog (3, "  setting iSub coefficient for sample rate (%ld)", newSampleRate->whole);
					Set4thOrderCoefficients (&(miSubProcessingParams.coefficients), newSampleRate->whole);

					newSampleOffset = (kMinimumLatencyiSub * ((newSampleRate->whole * 1000) / 44100)) / 1000;
				} else {
					newSampleOffset = (kMinimumLatency * ((newSampleRate->whole * 1000) / 44100)) / 1000;
				}
				setSampleOffset (newSampleOffset);
			}
			resetiSubProcessingState ();
		}
		
		// Tell AppleOnboardAudio about the format or sample rate change.
		result = ourProvider->formatChangeRequest (newFormat, newSampleRate);

		debugIOLog (3, "  ourProvider->formatChangeRequest returns %d", result);

		// in and out have the same format always.
		chooseOutputClippingRoutinePtr();
		chooseInputConversionRoutinePtr();
	}
Exit:
	//	[3945202]	If 'performFormatChange' is invoked then the hardware must be awakened.  This is especially true
	//	of the TAS3004 which cannot have the format applied if in sleep mode.
	
	FailMessage ( kIOReturnSuccess != ourProvider->doLocalChangeScheduleIdle ( wasPoweredDown ) );	//	[3886091]	do not overwrite result value
	
	debugIOLog (3, "- AppleDBDMAAudio::performFormatChange (%p, %p, %p) returns %lX", audioStream, newFormat, newSampleRate, result);	
    return result;
}

void AppleDBDMAAudio::updateDSPForSampleRate (UInt32 inSampleRate) {	
}

#pragma mark ------------------------ 
#pragma mark  iSub Support
#pragma mark ------------------------ 

IOReturn AppleDBDMAAudio::iSubAttachChangeHandler (IOService *target, IOAudioControl *attachControl, SInt32 oldValue, SInt32 newValue) {
    IOReturn						result;
    AppleDBDMAAudio *		audioDMAEngine;
    IOCommandGate *					cg;

	debugIOLog (3, "+ AppleDBDMAAudio::iSubAttachChangeHandler (%p, %p, 0x%lx, 0x%lx)", target, attachControl, oldValue, newValue);

	result = kIOReturnSuccess;
	if (oldValue != newValue) {
		audioDMAEngine = OSDynamicCast (AppleDBDMAAudio, target);
		FailIf (NULL == audioDMAEngine, Exit);
	
		if (newValue) {
			debugIOLog (3, "  will try to connect to an iSub, installing notifier.");
			// Set up notifier to run when iSub shows up
			audioDMAEngine->iSubEngineNotifier = addNotification (gIOPublishNotification, serviceMatching ("AppleiSubEngine"), (IOServiceNotificationHandler)&iSubEnginePublished, audioDMAEngine);
			if (NULL != audioDMAEngine->iSubBufferMemory) {
				// it looks like the notifier could be called before iSubEngineNotifier is set, 
				// so if it was called, then iSubBufferMemory would no longer be NULL and we can remove the notifier
				debugIOLog (3, "  iSub was already attached");
				audioDMAEngine->iSubEngineNotifier->remove ();
				audioDMAEngine->iSubEngineNotifier = NULL;
			}
		} else {
			debugIOLog (3, "  do not try to connect to iSub, removing notifier.");
			if (NULL != audioDMAEngine->iSubBufferMemory) {
				debugIOLog (3, "  disconnect from iSub");
				// We're already attached to an iSub, so detach
				cg = audioDMAEngine->getCommandGate ();
				if (NULL != cg) {
					cg->runAction (iSubCloseAction);
				}
			}
	
			// We're not attached to the iSub, so just remove our notifier
			if (NULL != audioDMAEngine->iSubEngineNotifier) {
				debugIOLog (3, "  remove iSub notifier");
				audioDMAEngine->iSubEngineNotifier->remove ();
				audioDMAEngine->iSubEngineNotifier = NULL;
			}
		}
	}
	
Exit:
    debugIOLog (3, "- AppleDBDMAAudio::iSubAttachChangeHandler");
    return result;
}

bool AppleDBDMAAudio::iSubEnginePublished (AppleDBDMAAudio * dbdmaEngineObject, void * refCon, IOService * newService) {
	IOReturn						result;
	bool							resultCode;
    IOCommandGate *					cg;

	debugIOLog (3, "+ AppleDBDMAAudio::iSubEnginePublished (%p, %p, %p)", dbdmaEngineObject, (UInt32*)refCon, newService);

	resultCode = false;

	FailIf (NULL == dbdmaEngineObject, Exit);
	FailIf (NULL == newService, Exit);

	dbdmaEngineObject->iSubEngine = (AppleiSubEngine *)newService;
	FailIf (NULL == dbdmaEngineObject->iSubEngine, Exit);

	// Create the memory for the high/low samples to go into
    dbdmaEngineObject->miSubProcessingParams.lowFreqSamples = (float *)IOMallocAligned ((dbdmaEngineObject->numBlocks * dbdmaEngineObject->blockSize) * sizeof (float), PAGE_SIZE);
	FailIf (NULL == dbdmaEngineObject->miSubProcessingParams.lowFreqSamples, Exit);
    dbdmaEngineObject->miSubProcessingParams.highFreqSamples = (float *)IOMallocAligned ((dbdmaEngineObject->numBlocks * dbdmaEngineObject->blockSize) * sizeof (float), PAGE_SIZE);
	FailIf (NULL == dbdmaEngineObject->miSubProcessingParams.highFreqSamples, Exit);

    Set4thOrderCoefficients (&(dbdmaEngineObject->miSubProcessingParams.coefficients), (dbdmaEngineObject->getSampleRate())->whole);

	// Open the iSub which will cause it to create mute and volume controls
//	dbdmaEngineObject->attach (dbdmaEngineObject->iSubEngine);
	dbdmaEngineObject->iSubEngine->retain ();
	cg = dbdmaEngineObject->getCommandGate ();
//	FailWithAction (NULL == cg, dbdmaEngineObject->detach (dbdmaEngineObject->iSubEngine), Exit);
	FailWithAction (NULL == cg, dbdmaEngineObject->iSubEngine->release(), Exit);
	dbdmaEngineObject->setSampleOffset(kMinimumLatencyiSub);	// HAL should notice this when iSub adds it's controls and sends out update
	IOSleep (102);
	result = cg->runAction (iSubOpenAction);
	FailWithAction (kIOReturnSuccess != result, dbdmaEngineObject->iSubEngine->release (), Exit);
	dbdmaEngineObject->iSubBufferMemory = dbdmaEngineObject->iSubEngine->GetSampleBuffer ();
	debugIOLog (3, "  iSubBuffer length = %ld", dbdmaEngineObject->iSubBufferMemory->getLength ());

	// remove our notifier because we only care about the first iSub
	if (NULL != dbdmaEngineObject->iSubEngineNotifier) {
		dbdmaEngineObject->iSubEngineNotifier->remove ();
		dbdmaEngineObject->iSubEngineNotifier = NULL;
	}

	resultCode = true;
	dbdmaEngineObject->iSubOpen = TRUE;

Exit:
	if (FALSE == resultCode) {
		// We didn't actually open the iSub
		dbdmaEngineObject->iSubBufferMemory = NULL;
		dbdmaEngineObject->iSubEngine = NULL;
		dbdmaEngineObject->iSubOpen = FALSE;
		dbdmaEngineObject->setSampleOffset(kMinimumLatency);

		if (NULL != dbdmaEngineObject->miSubProcessingParams.lowFreqSamples) {
			IOFree (dbdmaEngineObject->miSubProcessingParams.lowFreqSamples, (dbdmaEngineObject->numBlocks * dbdmaEngineObject->blockSize) * sizeof (float));
		}

		if (NULL != dbdmaEngineObject->miSubProcessingParams.highFreqSamples) {
			IOFree (dbdmaEngineObject->miSubProcessingParams.highFreqSamples, (dbdmaEngineObject->numBlocks * dbdmaEngineObject->blockSize) * sizeof (float));
		}

	} else {
		// [3094574] aml - iSub opened sucessfully, update the clipping routine
		dbdmaEngineObject->chooseOutputClippingRoutinePtr();
	}
	
	debugIOLog (3, "- AppleDBDMAAudio::iSubEnginePublished (%p, %p, %p), result = %d", dbdmaEngineObject, (UInt32 *)refCon, newService, resultCode);
	return resultCode;
}

IOReturn AppleDBDMAAudio::iSubCloseAction (OSObject *owner, void *arg1, void *arg2, void *arg3, void *arg4) {
    if (NULL != owner) {
        AppleDBDMAAudio *		audioEngine;

		debugIOLog (3, "+ AppleDBDMAAudio::iSubCloseAction");

		audioEngine = OSDynamicCast (AppleDBDMAAudio, owner);

        if (NULL != audioEngine && NULL != audioEngine->iSubEngine && TRUE == audioEngine->iSubOpen) {
			AppleiSubEngine *				oldiSubEngine;
			
			oldiSubEngine = audioEngine->iSubEngine;
			
			audioEngine->pauseAudioEngine ();
			audioEngine->beginConfigurationChange ();

			audioEngine->iSubEngine->closeiSub (audioEngine);

			audioEngine->iSubEngine = NULL;
			audioEngine->iSubBufferMemory = NULL;

			// [3094574] aml - iSub is gone, update the clipping routine while the engine is paused
			audioEngine->chooseOutputClippingRoutinePtr ();

			audioEngine->completeConfigurationChange ();
			audioEngine->resumeAudioEngine ();

			oldiSubEngine->release (); //(audioEngine->iSubEngine);

			//audioEngine->iSubEngine = NULL;
			//audioEngine->iSubBufferMemory = NULL;

			if (NULL != audioEngine->miSubProcessingParams.lowFreqSamples) {
				IOFree (audioEngine->miSubProcessingParams.lowFreqSamples, (audioEngine->numBlocks * audioEngine->blockSize) * sizeof (float));
				audioEngine->miSubProcessingParams.lowFreqSamples = NULL;
			}

			if (NULL != audioEngine->miSubProcessingParams.highFreqSamples) {
				IOFree (audioEngine->miSubProcessingParams.highFreqSamples, (audioEngine->numBlocks * audioEngine->blockSize) * sizeof (float));
				audioEngine->miSubProcessingParams.highFreqSamples = NULL;
			}

			debugIOLog (3, "  iSub connections terminated");
        } else {
			debugIOLog (3, "  didn't terminate the iSub connections because we didn't have an audioEngine");
		}
	} else {
		debugIOLog (3, "  didn't terminate the iSub connections owner = %p, arg1 = %p", owner, arg1);
    }

	debugIOLog (3, "- AppleDBDMAAudio::iSubCloseAction");
	return kIOReturnSuccess;
}

IOReturn AppleDBDMAAudio::iSubOpenAction (OSObject *owner, void *arg1, void *arg2, void *arg3, void *arg4) {
	IOReturn					result;
	bool						resultBool;

	debugIOLog (3, "+ AppleDBDMAAudio::iSubOpenAction");

	result = kIOReturnError;
	resultBool = FALSE;

    if (NULL != owner) {
        AppleDBDMAAudio *		audioEngine;

		audioEngine = OSDynamicCast (AppleDBDMAAudio, owner);
		resultBool = audioEngine->iSubEngine->openiSub (audioEngine, &requestiSubClose);
    }

	if (resultBool) {
		result = kIOReturnSuccess;
	}

	debugIOLog (3, "- AppleDBDMAAudio::iSubOpenAction");
	return result;
}

void AppleDBDMAAudio::iSubSynchronize(UInt32 firstSampleFrame, UInt32 numSampleFrames) 
{
	void *						iSubBuffer = NULL;
	SInt32						offsetDelta;
	SInt32						safetyOffset;
	UInt32						iSubBufferLen = 0;
	iSubAudioFormatType			iSubFormat;	
	UInt32						distance;
	static UInt32				oldiSubBufferOffset;

	UInt32						adaptiveSampleRate;
	UInt32						sampleRate;

	// pass in:
	//
	//  in the iSubProcessingParams structure, need to set before this method
	// iSubBufferLen		iSubBufferMemory->getLength ()
	// iSubBuffer			(void*)iSubBufferMemory->getVirtualSegment (0, &iSubBufferLen)
	// sampleRate 			getSampleRate()->whole
	// iSubFormat			iSubEngine->Get methods
	//
	//  in values/pointers
	// iSubEngineLoopCount	iSubEngine->GetCurrentLoopCount ()
	// iSubEngineByteCount	iSubEngine->GetCurrentByteCount ()
	// 
	//  io pointers							$$$
	// &needToSync				member
	// &startiSub				member
	// &justResetClipPosition	member		
	// &initialiSubLead			member
	// &previousClippedToFrame	member
	// iSubEngineNeedToSync		iSubEngine->GetNeedToSync(), iSubEngine->SetNeedToSync()
	
	iSubBufferLen = iSubBufferMemory->getLength ();		
	iSubBuffer = (void*)iSubBufferMemory->getVirtualSegment (0, &iSubBufferLen); 
	// (iSubBufferLen / 2) is because iSubBufferOffset is in UInt16s so convert iSubBufferLen to UInt16 length
	iSubBufferLen = iSubBufferLen / 2;

	sampleRate = getSampleRate()->whole;		
	adaptiveSampleRate = sampleRate;

	iSubFormat.altInterface = iSubEngine->GetAltInterface();	
	iSubFormat.numChannels = iSubEngine->GetNumChannels();		
	iSubFormat.bytesPerSample = iSubEngine->GetBytesPerSample();		
	iSubFormat.outputSampleRate = iSubEngine->GetSampleRate();		

	if (needToSync == FALSE) {
		UInt32			wrote;
		wrote = miSubProcessingParams.iSubBufferOffset - oldiSubBufferOffset;
//			debugIOLog (3, "wrote %ld iSub samples", wrote);
		if (miSubProcessingParams.iSubLoopCount == iSubEngine->GetCurrentLoopCount () && miSubProcessingParams.iSubBufferOffset > (SInt32)(iSubEngine->GetCurrentByteCount () / 2)) {
			distance = miSubProcessingParams.iSubBufferOffset - (iSubEngine->GetCurrentByteCount () / 2);
		} else if (miSubProcessingParams.iSubLoopCount == (iSubEngine->GetCurrentLoopCount () + 1) && miSubProcessingParams.iSubBufferOffset < (SInt32)(iSubEngine->GetCurrentByteCount () / 2)) {
			distance = iSubBufferLen - (iSubEngine->GetCurrentByteCount () / 2) + miSubProcessingParams.iSubBufferOffset;
		} else {
			distance = initialiSubLead;
		}

		if (sampleRate < 64000) {
			if (distance < (initialiSubLead / 2)) {			
				// Write more samples into the iSub's buffer
				debugIOLog (3, "  speed up! %ld, %ld, %ld", initialiSubLead, distance, iSubEngine->GetCurrentByteCount () / 2);
				adaptiveSampleRate = sampleRate - (sampleRate >> 4);
			} else if (distance > (initialiSubLead + (initialiSubLead / 2))) {
				// Write fewer samples into the iSub's buffer
				debugIOLog (3, "  slow down! %ld, %ld, %ld", initialiSubLead, distance, iSubEngine->GetCurrentByteCount () / 2);
				adaptiveSampleRate = sampleRate + (sampleRate >> 4);
			} else {
				// The sample rate is just right
				debugIOLog (3, "  just right %ld, %ld, %ld", initialiSubLead, distance, iSubEngine->GetCurrentByteCount () / 2);
			}
		}
	}
	
	// Detect being out of sync with the iSub
	if (needToSync == FALSE && previousClippedToFrame == firstSampleFrame && 0x0 != iSubEngine->GetCurrentLoopCount ()) {
		// aml - make the reader/writer check more strict - this helps get rid of long term crunchy iSub audio
		// the reader is now not allowed within one frame (one millisecond of audio) of the writer
		safetyOffset = miSubProcessingParams.iSubBufferOffset - ((iSubFormat.outputSampleRate) / 1000);		// 6 samples at 6kHz
		if (safetyOffset < 0) {
			safetyOffset += iSubBufferLen;
		}
		if (miSubProcessingParams.iSubLoopCount == iSubEngine->GetCurrentLoopCount () && safetyOffset < (SInt32)(iSubEngine->GetCurrentByteCount () / 2)) {
			#if DEBUGLOG
			distance = miSubProcessingParams.iSubBufferOffset - (iSubEngine->GetCurrentByteCount () / 2);
			debugIOLog (3, "  ****iSub is in front of write head safetyOffset = %ld, iSubEngine->GetCurrentByteCount () / 2 = %ld", safetyOffset, iSubEngine->GetCurrentByteCount () / 2);
//			debugIOLog (3, "  distance = %ld", distance);
			#endif
			needToSync = TRUE;
			startiSub = TRUE;
		} else if (miSubProcessingParams.iSubLoopCount > (iSubEngine->GetCurrentLoopCount () + 1)) {
			debugIOLog (3, "  ****looped more than the iSub iSubLoopCount = %ld, iSubEngine->GetCurrentLoopCount () = %ld", miSubProcessingParams.iSubLoopCount, iSubEngine->GetCurrentLoopCount ());
			needToSync = TRUE;
			startiSub = TRUE;
		} else if (miSubProcessingParams.iSubLoopCount < iSubEngine->GetCurrentLoopCount ()) {
			debugIOLog (3, "  ****iSub is ahead of us iSubLoopCount = %ld, iSubEngine->GetCurrentLoopCount () = %ld", miSubProcessingParams.iSubLoopCount, iSubEngine->GetCurrentLoopCount ());
			needToSync = TRUE;
			startiSub = TRUE;
		} else if (miSubProcessingParams.iSubLoopCount == iSubEngine->GetCurrentLoopCount () && miSubProcessingParams.iSubBufferOffset > ((SInt32)( (iSubEngine->GetCurrentByteCount() + (((iSubFormat.outputSampleRate)/1000 * NUM_ISUB_FRAME_LISTS_TO_QUEUE * NUM_ISUB_FRAMES_PER_LIST) * iSubFormat.bytesPerSample * iSubFormat.numChannels) ) / 2))) {			// aml 3.27.02, this is the right number here (buffersize was 2x too large).
			debugIOLog (3, "  ****iSub is too far behind write head iSubBufferOffset = %ld, (iSubEngine->GetCurrentByteCount () / 2 + max queued data) = %ld", miSubProcessingParams.iSubBufferOffset, (iSubEngine->GetCurrentByteCount() / 2 + iSubBufferLen/2));					
			needToSync = TRUE;
			startiSub = TRUE;
		}
	}
	if (FALSE == needToSync && previousClippedToFrame != firstSampleFrame && !(previousClippedToFrame == getNumSampleFramesPerBuffer () && firstSampleFrame == 0)) {
		debugIOLog (3, "  clipOutput: no sync: iSubBufferOffset was %ld", miSubProcessingParams.iSubBufferOffset);
		if (firstSampleFrame < previousClippedToFrame) {
			debugIOLog (3, "  clipOutput: no sync: firstSampleFrame < previousClippedToFrame (delta = %ld)", previousClippedToFrame-firstSampleFrame);
			// We've wrapped around the buffer
			offsetDelta = (getNumSampleFramesPerBuffer () - previousClippedToFrame + firstSampleFrame) * iSubEngine->GetNumChannels();	
		} else {
			debugIOLog (3, "  clipOutput: no sync: previousClippedToFrame < firstSampleFrame (delta = %ld)", firstSampleFrame - previousClippedToFrame);
			offsetDelta = (firstSampleFrame - previousClippedToFrame) * iSubEngine->GetNumChannels();
		}
		// aml 3.21.02, adjust for new sample rate
		offsetDelta = (offsetDelta * 1000) / ((sampleRate * 1000) / iSubFormat.outputSampleRate);

		miSubProcessingParams.iSubBufferOffset += offsetDelta;
		debugIOLog (3, "  clipOutput: no sync: clip to point was %ld, now %ld (delta = %ld)", previousClippedToFrame, firstSampleFrame, offsetDelta);
		debugIOLog (3, "  clipOutput: no sync: iSubBufferOffset is now %ld", miSubProcessingParams.iSubBufferOffset);
		if (miSubProcessingParams.iSubBufferOffset > (SInt32)iSubBufferLen) {
			debugIOLog (3, "  clipOutput: no sync: iSubBufferOffset > iSubBufferLen, iSubBufferOffset = %ld", miSubProcessingParams.iSubBufferOffset);
			// Our calculated spot has actually wrapped around the iSub's buffer.
			miSubProcessingParams.iSubLoopCount += miSubProcessingParams.iSubBufferOffset / iSubBufferLen;
			miSubProcessingParams.iSubBufferOffset = miSubProcessingParams.iSubBufferOffset % iSubBufferLen;

			debugIOLog (3, "  clipOutput: no sync: iSubBufferOffset > iSubBufferLen, iSubBufferOffset is now %ld", miSubProcessingParams.iSubBufferOffset);
		} else if (miSubProcessingParams.iSubBufferOffset < 0) {

			miSubProcessingParams.iSubBufferOffset += iSubBufferLen;

			debugIOLog (3, "  clipOutput: no sync: iSubBufferOffset < 0, iSubBufferOffset is now %ld", miSubProcessingParams.iSubBufferOffset);
		}
	}

	if (TRUE == justResetClipPosition) {
		justResetClipPosition = FALSE;
		needToSync = FALSE;
		startiSub = FALSE;
	}

	// sync up with iSub only if everything is proceeding normally.
	// aml [3095619] - added check with iSubEngine for sync state.
	if ((TRUE == needToSync) || (iSubEngine->GetNeedToSync())) {		
		UInt32				curSampleFrame;
		
		// aml [3095619] reset iSub sync state if we've handled that case.
		iSubEngine->SetNeedToSync(false);								
		
		needToSync = FALSE;
					
		resetiSubProcessingState();
					
		// aml 4.25.02 wipe out the iSub buffer, changed due to moving zeroing of iSub buffer in AUA write handler when aborting the pipe
		bzero(iSubBuffer, iSubBufferLen);

		curSampleFrame = getCurrentSampleFrame ();

		if (TRUE == restartedDMA) {
			miSubProcessingParams.iSubBufferOffset = initialiSubLead;		
			restartedDMA = FALSE;
		} else {
			if (firstSampleFrame < curSampleFrame) {
				offsetDelta = (getNumSampleFramesPerBuffer () - curSampleFrame + firstSampleFrame) * iSubEngine->GetNumChannels();
			} else {
				offsetDelta = (firstSampleFrame - curSampleFrame) * iSubEngine->GetNumChannels();
			}
			#if DEBUGLOG
			debugIOLog (3, "  clipOutput: need to sync: internal sample rate offsetDelta = %ld", offsetDelta);

			if (offsetDelta < kMinimumLatency) {
				debugIOLog (3, "  clipOutput: no sync: 44.1 offsetDelta < min, offsetDelta=%ld", offsetDelta); 
			}                
			#endif
			// aml 3.21.02, adjust for new sample rate
			offsetDelta = (offsetDelta * 1000) / ((sampleRate * 1000) / iSubFormat.outputSampleRate);
			debugIOLog (3, "  clipOutput: need to sync: before iSubBufferOffset = %ld", miSubProcessingParams.iSubBufferOffset);
			debugIOLog (3, "  clipOutput: need to sync: iSub sample rate offsetDelta = %ld", offsetDelta);

			miSubProcessingParams.iSubBufferOffset = offsetDelta;
			debugIOLog (3, "  clipOutput: need to sync: offsetDelta = %ld", offsetDelta);
			debugIOLog (3, "  clipOutput: need to sync: firstSampleFrame = %ld, curSampleFrame = %ld", firstSampleFrame, curSampleFrame);
			debugIOLog (3, "  clipOutput: need to sync: starting iSubBufferOffset = %ld, numSampleFrames = %ld", miSubProcessingParams.iSubBufferOffset, numSampleFrames);
			if (miSubProcessingParams.iSubBufferOffset > (SInt32)iSubBufferLen) {
		
				needToSync = TRUE;	// aml 4.24.02, requests larger than our buffer size = bad!
				debugIOLog (3, "  clipOutput: need to sync: iSubBufferOffset too big (%ld) RESYNC!", miSubProcessingParams.iSubBufferOffset);
				
				// Our calculated spot has actually wrapped around the iSub's buffer.

				miSubProcessingParams.iSubLoopCount += miSubProcessingParams.iSubBufferOffset / iSubBufferLen;
				miSubProcessingParams.iSubBufferOffset = miSubProcessingParams.iSubBufferOffset % iSubBufferLen;

				debugIOLog (3, "  clipOutput: need to sync: iSubBufferOffset > iSubBufferLen (%ld), iSubBufferOffset is now %ld", iSubBufferLen, miSubProcessingParams.iSubBufferOffset);
			} else if (miSubProcessingParams.iSubBufferOffset < 0) {

				miSubProcessingParams.iSubBufferOffset += iSubBufferLen;

				debugIOLog (3, "  clipOutput: need to sync: iSubBufferOffset < 0, iSubBufferOffset is now %ld", miSubProcessingParams.iSubBufferOffset);
			}
			initialiSubLead = miSubProcessingParams.iSubBufferOffset;
		}
	}

	// [3094574] aml - updated iSub state, some of this could probably be done once off line, but it isn't any worse than before
	miSubProcessingParams.iSubBufferLen = iSubBufferLen;
	miSubProcessingParams.iSubFormat.altInterface = iSubEngine->GetAltInterface();
	miSubProcessingParams.iSubFormat.numChannels = iSubEngine->GetNumChannels();
	miSubProcessingParams.iSubFormat.bytesPerSample = iSubEngine->GetBytesPerSample();
	miSubProcessingParams.iSubFormat.outputSampleRate = iSubEngine->GetSampleRate();
	miSubProcessingParams.sampleRate = sampleRate;
	miSubProcessingParams.adaptiveSampleRate = adaptiveSampleRate;
	miSubProcessingParams.iSubBuffer = (SInt16*)iSubBuffer;

	return;
}

void AppleDBDMAAudio::resetiSubProcessingState() 
{ 	
	miSubProcessingParams.srcPhase =  1.0;		
	miSubProcessingParams.srcState =  0.0;		
				
	miSubProcessingParams.filterState.xl_1 = 0.0;
	miSubProcessingParams.filterState.xr_1 = 0.0;
	miSubProcessingParams.filterState.xl_2 = 0.0;
	miSubProcessingParams.filterState.xr_2 = 0.0;
	miSubProcessingParams.filterState.yl_1 = 0.0;
	miSubProcessingParams.filterState.yr_1 = 0.0;
	miSubProcessingParams.filterState.yl_2 = 0.0;
	miSubProcessingParams.filterState.yr_2 = 0.0;

	miSubProcessingParams.filterState2.xl_1 = 0.0;
	miSubProcessingParams.filterState2.xr_1 = 0.0;
	miSubProcessingParams.filterState2.xl_2 = 0.0;
	miSubProcessingParams.filterState2.xr_2 = 0.0;
	miSubProcessingParams.filterState2.yl_1 = 0.0;
	miSubProcessingParams.filterState2.yr_1 = 0.0;
	miSubProcessingParams.filterState2.yl_2 = 0.0;
	miSubProcessingParams.filterState2.yr_2 = 0.0;

	miSubProcessingParams.phaseCompState.xl_1 = 0.0;
	miSubProcessingParams.phaseCompState.xr_1 = 0.0;
	miSubProcessingParams.phaseCompState.xl_2 = 0.0;
	miSubProcessingParams.phaseCompState.xr_2 = 0.0;
	miSubProcessingParams.phaseCompState.yl_1 = 0.0;
	miSubProcessingParams.phaseCompState.yr_1 = 0.0;
	miSubProcessingParams.phaseCompState.yl_2 = 0.0;
	miSubProcessingParams.phaseCompState.yr_2 = 0.0;
	
	return;   	
}

bool AppleDBDMAAudio::willTerminate (IOService * provider, IOOptionBits options) {
//	IOCommandGate *					cg;
	Boolean 						result;
	
	debugIOLog (3, "+ AppleDBDMAAudio[%p]::willTerminate (%p)", this, provider);

/*
	if (iSubEngine == (AppleiSubEngine *)provider) {
		debugIOLog (3, "iSub requesting termination");

		cg = getCommandGate ();
		if (NULL != cg) {
			cg->runAction (iSubCloseAction);
		}

		// Set up notifier to run when iSub shows up again
		if (NULL != iSubAttach) {
			if (iSubAttach->getIntValue ()) {
				iSubEngineNotifier = addNotification (gIOPublishNotification, serviceMatching ("AppleiSubEngine"), (IOServiceNotificationHandler)&iSubEnginePublished, this);
			}
		}
	}
*/
	
	debugIOLog (3, "  AppleDBDMAAudio::willTerminate, before audioDevice retain count = %d", audioDevice->getRetainCount());

	result = super::willTerminate (provider, options);
	debugIOLog (3, "- AppleDBDMAAudio[%p]::willTerminate, super::willTerminate () returned %d", this, result);

	return result;
}


bool AppleDBDMAAudio::requestTerminate (IOService * provider, IOOptionBits options) {
	Boolean 						result;

	result = super::requestTerminate (provider, options);
	debugIOLog (3, " AppleDBDMAAudio[%p]::requestTerminate, super::requestTerminate () returned %d", this, result);

	return result;
}

void AppleDBDMAAudio::requestiSubClose (IOAudioEngine * audioEngine) {
	AppleDBDMAAudio *				dbdmaAudioEngine;
    IOCommandGate *								cg;

	dbdmaAudioEngine = OSDynamicCast (AppleDBDMAAudio, audioEngine);

	cg = dbdmaAudioEngine->getCommandGate ();
	if (NULL != cg) {
		cg->runAction (dbdmaAudioEngine->iSubCloseAction);
	}

	// Set up notifier to run when iSub shows up again
	if (dbdmaAudioEngine->iSubAttach->getIntValue ()) {
		dbdmaAudioEngine->iSubEngineNotifier = addNotification (gIOPublishNotification, serviceMatching ("AppleiSubEngine"), (IOServiceNotificationHandler)&dbdmaAudioEngine->iSubEnginePublished, dbdmaAudioEngine);
	}
}

void AppleDBDMAAudio::updateiSubPosition(UInt32 firstSampleFrame, UInt32 numSampleFrames)
{
	if (TRUE == startiSub) {
		iSubEngine->StartiSub ();
		startiSub = FALSE;
		miSubProcessingParams.iSubLoopCount = 0;
 	}

	previousClippedToFrame = firstSampleFrame + numSampleFrames;
}

#pragma mark ------------------------ 
#pragma mark  Utilities
#pragma mark ------------------------ 

inline void AppleDBDMAAudio::startOutputTiming() {
    if ( mEnableCPUProfiling )
    {
        mOutputIOProcCallCount++;
        if ((mOutputIOProcCallCount % kIOProcTimingCountCurrent) == 0) {
            AbsoluteTime				uptime;
            UInt64						nanos;
            // get time for end of last cycle
            clock_get_uptime (&uptime);
            // calculate total time between start of last cycle and end of last cycle
            SUB_ABSOLUTETIME (&uptime, &mStartOutputIOProcUptime);
            // convert total time to nanos
            absolutetime_to_nanoseconds (uptime, &mCurrentTotalOutputNanos);
            mTotalOutputIOProcNanos += mCurrentTotalOutputNanos >> 10;
            // calculate time between start of last cycle and end of output processing time
            SUB_ABSOLUTETIME (&mEndOutputProcessingUptime, &mStartOutputIOProcUptime);
            // convert output processing time to nanos
            absolutetime_to_nanoseconds (mEndOutputProcessingUptime, &nanos);
            // subtract any time spent not actually output processing
            nanos -= mCurrentTotalPausedOutputNanos;
            mTotalOutputProcessingNanos += nanos >> 10;
            // calculate the percentage of nonos out of the cycle spent in output processing
            convertNanosToPercent(nanos, mCurrentTotalOutputNanos, &mCurrentOutputCPUUsagePercent);
        }
        
        if ((mOutputIOProcCallCount % kIOProcTimingCountAverage) == 0) {
            convertNanosToPercent(mTotalOutputProcessingNanos, mTotalOutputIOProcNanos, &mAverageOutputCPUUsagePercent);
        }
        
        // reset count of paused output processing time
        mCurrentTotalPausedOutputNanos = 0;
        // store start time for new cycle
        clock_get_uptime (&mStartOutputIOProcUptime);
    }
}

inline void AppleDBDMAAudio::endOutputTiming() {
    if ( mEnableCPUProfiling )
    {
        clock_get_uptime (&mEndOutputProcessingUptime);		
    }
}

inline void AppleDBDMAAudio::pauseOutputTiming() {
    if ( mEnableCPUProfiling )
    {
        clock_get_uptime (&mPauseOutputProcessingUptime);
    }
}

inline void AppleDBDMAAudio::resumeOutputTiming() {
    if ( mEnableCPUProfiling )
    {
        AbsoluteTime    uptime;
        UInt64          nanos;
        
        clock_get_uptime (&uptime);
        SUB_ABSOLUTETIME (&uptime, &mPauseOutputProcessingUptime);
        absolutetime_to_nanoseconds (uptime, &nanos);
        mCurrentTotalPausedOutputNanos += nanos;
    }
}

inline void AppleDBDMAAudio::startInputTiming() {
    if ( mEnableCPUProfiling )
    {
        mInputIOProcCallCount++;
        if ((mInputIOProcCallCount % kIOProcTimingCountCurrent) == 0) {
            AbsoluteTime				uptime;
            UInt64						nanos;
            // get time for end of last cycle
            clock_get_uptime (&uptime);
            // calculate total time between start of last cycle and end of last cycle
            SUB_ABSOLUTETIME (&uptime, &mStartInputIOProcUptime);
            // convert total time to nanos
            absolutetime_to_nanoseconds (uptime, &mCurrentTotalInputNanos);
            mTotalInputIOProcNanos += mCurrentTotalInputNanos >> 10;
            // calculate time between start of last cycle and end of input processing time
            SUB_ABSOLUTETIME (&mEndInputProcessingUptime, &mStartInputIOProcUptime);
            // convert input processing time to nanos
            absolutetime_to_nanoseconds (mEndInputProcessingUptime, &nanos);
            // subtract any time spent not actually input processing
            nanos -= mCurrentTotalPausedInputNanos;
            mTotalInputProcessingNanos += nanos >> 10;
            // calculate the percentage of nanos out of the cycle spent in input processing
            convertNanosToPercent(nanos, mCurrentTotalInputNanos, &mCurrentInputCPUUsagePercent);
        }
        
        if ((mInputIOProcCallCount % kIOProcTimingCountAverage) == 0) {
            convertNanosToPercent(mTotalInputProcessingNanos, mTotalInputIOProcNanos, &mAverageInputCPUUsagePercent);
        }
        
        // reset count of paused input processing time
        mCurrentTotalPausedInputNanos = 0;
        // store start time for new cycle
        clock_get_uptime (&mStartInputIOProcUptime);
    }
}

inline void AppleDBDMAAudio::endInputTiming() {
    if ( mEnableCPUProfiling )
    {
        clock_get_uptime (&mEndInputProcessingUptime);		
    }
}

inline void AppleDBDMAAudio::pauseInputTiming() {
    if ( mEnableCPUProfiling )
    {
        clock_get_uptime (&mPauseInputProcessingUptime);
    }
}

inline void AppleDBDMAAudio::resumeInputTiming() {
    if ( mEnableCPUProfiling )
    {
        AbsoluteTime    uptime;
        UInt64          nanos;
        
        clock_get_uptime (&uptime);
        SUB_ABSOLUTETIME (&uptime, &mPauseInputProcessingUptime);
        absolutetime_to_nanoseconds (uptime, &nanos);
        mCurrentTotalPausedInputNanos += nanos;
    }
}

// --------------------------------------------------------------------------
//	When running on the external I2S clock, it is possible to stall the
//	DMA with no indication of an error due to a loss of clock.  This method 
//	detects that the DMA has stalled.  Recovery is implemented from within 
//	AppleOnboardAudio.
//
//	.........................................................................
//	
//	Revision 1.0 (31 Jan 1995) DbDMA specification states:
//
//	3.2	System-bus errors
//
//	An unrecoverable error on a system-memory access includes parity and addressing errors.
//	A busy-retry error shall be viewed as a recoverable bus error, and shall be retried until 
//	it completes successfully or the DMA controller's command processing is aborted.
//
//	An unrecoverable error sets the 'dead' bit in the 'ChannelStatus' register of the currently
//	executing DMA channel.  Software must explicitly reset the 'ChannelStatus.run' bit to zero
//	and later set it back to one in order to return to an operational state.
//
//	4.3.1	ChannelStatus.run
//
//	Software can clear this bit to zero to abort the operation of the channel.  When channel operation
//	is aborted data transfers are terminated, status is returned and an interrupt is generated (if 
//	requested in the 'Command.i' field of the command descriptor).  Data which is stored temporarily
//	in channel buffers may be lost.
//
//	4.3.5 ChannelStatus.dead
//
//	'ChannelStatus.dead' is set to one by hardware when the channel halts execution due
//	to a catastrophic event such as a bus-error or device error.  The current command is terminated,
//	and hardware attempts to write status back to memory.  Further commands are not executed.  If a 
//	hardware interrupt signal is implemented, an unconditional interrupt shall be generated.  When
//	hardware sets 'ChannelStatus.dead', 'channelStatus.active' is simultaneously negated.
//
//	Hardware resets 'ChannelStatus.dead' to zero when the 'run' bit is cleared by software.
//
//	.........................................................................
//	
//	[3305011]	begin {
bool AppleDBDMAAudio::engineDied ( void ) {
	bool			result = FALSE;
	UInt32			tempInterruptCount;
	UInt32			dmaHwStatus;
	
	if ( mHasInput ) {
		dmaHwStatus =  OSReadLittleInt32( &ioBaseDMAInput->channelStatus, 0 );		//	[3514709]
		if ( 0 != ( dmaHwStatus & kdbdmaDead ) ) {
			mDmaRecoveryInProcess = TRUE;
			mDmaHwDiedCount++;
			result = TRUE;
		}
	}
	if ( !mDmaRecoveryInProcess ) {
		tempInterruptCount = 0;
		if ( dmaRunState ) {
			tempInterruptCount = mDmaInterruptCount;
			if ( tempInterruptCount == mLastDmaInterruptCount ) {
				mNumberOfFrozenDmaInterruptCounts++;
				if ( kMAXIMUM_NUMBER_OF_FROZEN_DMA_IRQ_COUNTS <= mNumberOfFrozenDmaInterruptCounts ) {
					result = TRUE;
					mDmaRecoveryInProcess = TRUE;
					mDmaStalledCount++;
					mNumberOfFrozenDmaInterruptCounts = 0;
				}
			} else {
				mLastDmaInterruptCount = tempInterruptCount;
				mNumberOfFrozenDmaInterruptCounts = 0;
				mDmaRecoveryInProcess = FALSE;								//	[3514709]
			}
		} else {
			mLastDmaInterruptCount = tempInterruptCount;
			mNumberOfFrozenDmaInterruptCounts = 0;
		}
	}
	return result;
}
//	} end	[3305011]