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/*=============================================================================
	SMACSCDUtility.cpp

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

//=============================================================================
//	Includes
//=============================================================================
#include <CAConditionalMacros.h>

#include "SMACSCDUtility.h"

//=============================================================================
//	SMACSCDUtility
//=============================================================================

bool	SMACSCDUtility::HasData(const ExtendedSoundComponentData* inExtendedData)
{
	bool theAnswer = false;
	
	if((inExtendedData->extendedFlags & kExtendedSoundBufferSizeValid) != 0)
	{
		//	the sample count isn't valid, but the buffer byte size is
		theAnswer = inExtendedData->bufferSize > 0;
	}
	else if((inExtendedData->extendedFlags & kExtendedSoundSampleCountNotValid) == 0)
	{
		//	the sample count is valid, so use that
		theAnswer = inExtendedData->desc.sampleCount > 0;
	}
	else
	{
		//	this is a badly formed ExtendedSoundComponentData since both the sample count
		//	and the buffer byte size are invalid
		theAnswer = false;
	}
	
	return theAnswer;
}

bool	SMACSCDUtility::HasData(const SoundComponentData* inData)
{
	bool theAnswer = false;
	
	if(IsSoundComponentData(inData))
	{
		theAnswer = inData->sampleCount > 0;
	}
	else
	{
		const ExtendedSoundComponentData* theExtendedData = reinterpret_cast<const ExtendedSoundComponentData*>(inData);
		theAnswer = HasData(theExtendedData);
	}
	
	return theAnswer;
}

bool	SMACSCDUtility::NeedMoreSourceData(const SoundComponentData* inSourceData)
{
	bool theAnswer = inSourceData == NULL;
	
	if(!theAnswer)
	{
		theAnswer = !HasData(inSourceData);
	}
	
	return theAnswer;
}

UInt32	SMACSCDUtility::GetDataByteSize(const ExtendedSoundComponentData* inExtendedData)
{
	UInt32 theAnswer = 0;
	
	if((inExtendedData->extendedFlags & kExtendedSoundBufferSizeValid) != 0)
	{
		//	the buffer size field is valid so use that
		theAnswer = inExtendedData->bufferSize;
	}
	else if((inExtendedData->extendedFlags & kExtendedSoundSampleCountNotValid) == 0)
	{
		//	buffer size isn't valid, but the number of frames is, so use that
		//	assuming the rest of the numbers in the struct are valid
		theAnswer = inExtendedData->desc.sampleCount * inExtendedData->desc.numChannels * (inExtendedData->desc.sampleSize >> 3);
	}
	else
	{
		//	this is a badly formed ExtendedSoundComponentData since both the sample count
		//	and the buffer byte size are invalid
		theAnswer = 0;
	}
	
	return theAnswer;
}

UInt32	SMACSCDUtility::GetDataByteSize(const SoundComponentData* inData)
{
	UInt32	theAnswer = 0;
	
	if(IsSoundComponentData(inData))
	{
		theAnswer = inData->sampleCount * inData->numChannels * (inData->sampleSize >> 3);
	}
	else
	{
		const ExtendedSoundComponentData* theExtendedData = reinterpret_cast<const ExtendedSoundComponentData*>(inData);
		
		theAnswer = GetDataByteSize(theExtendedData);
	}
	
	return theAnswer;
}

void	SMACSCDUtility::ConsumedData(ExtendedSoundComponentData* inExtendedData, UInt32 inAmountConsumed)
{
	if((inExtendedData->extendedFlags & kExtendedSoundBufferSizeValid) != 0)
	{
		//	the buffer size field is valid, so update it
		inExtendedData->bufferSize -= inAmountConsumed;
	}
	
	if((inExtendedData->extendedFlags & kExtendedSoundSampleCountNotValid) == 0)
	{
		//	the sample count field is valid, so update it
        inExtendedData->desc.sampleCount -= inAmountConsumed / (inExtendedData->desc.numChannels * (inExtendedData->desc.sampleSize >> 3));
    }
	
	//	update the buffer
	inExtendedData->desc.buffer += inAmountConsumed;
}

void	SMACSCDUtility::ConsumedData(SoundComponentData* inData, UInt32 inAmountConsumed)
{
	if(IsSoundComponentData(inData))
	{
		inData->sampleCount -= inAmountConsumed / (inData->numChannels * (inData->sampleSize >> 3));
        //inData->sampleCount = 0;
		inData->buffer +=inAmountConsumed;
	}
	else
	{
		ExtendedSoundComponentData* theExtendedData = reinterpret_cast<ExtendedSoundComponentData*>(inData);
		
		ConsumedData(theExtendedData, inAmountConsumed);
	}
}

#if TARGET_API_MAC_OSX && TARGET_CPU_PPC
Boolean SMACSCDUtility::HasAltiVec(void)
{
    Boolean hasAltiVec = false;
    OSErr    err;
    long    ppcFeatures;
    
    err = Gestalt ( gestaltPowerPCProcessorFeatures, &ppcFeatures );
    if ( err == noErr)
    {
        if ( ( ppcFeatures & kHasAltiVecMask) != 0 )
                hasAltiVec = true;
    }
        
    return hasAltiVec;
 }
 #endif
