// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of "Eclipse Public License v1.0"

 // which accompanies this distribution, and is available

 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

 //

 // Initial Contributors:

 // Nokia Corporation - initial contribution.

 //

 // Contributors:

 //

 // Description:

 //

 #include "MmfUtilities.h"

 #include "mmfutilitiespriv.h"

 #include "mmf/utils/rateconvert.h"

 const TInt KMaxInt16Bit = 65536 ; //Maximum for a 16bit int

 EXPORT_C CMMFChannelAndSampleRateConverterFactory::~CMMFChannelAndSampleRateConverterFactory()

 	{

 	delete iConverter;

 	}

 EXPORT_C CMMFChannelAndSampleRateConverter* CMMFChannelAndSampleRateConverterFactory::CreateConverterL(TInt aFromRate,TInt aFromChannels,

 													   TInt aToRate,TInt aToChannels)

 	{

 	if(aFromRate<0 || aFromChannels<0 || aToRate<0 || aToChannels<0)

 		{

 		User::Leave(KErrArgument);

 		}

 	iFromRate=aFromRate;

 	iToRate=aToRate;

 	iFromChannels=aFromChannels;

 	iToChannels=aToChannels;

 	return CreateConverterL();

 	}

 EXPORT_C CMMFChannelAndSampleRateConverter* CMMFChannelAndSampleRateConverterFactory::CreateConverterL()

 	{

 	if (iConverter

 		&&(iFromRate==iConverter->iFromRate)

 		&&(iToRate==iConverter->iToRate)

 		&&(iFromChannels==iConverter->iFromChannels)

 		&&(iToChannels==iConverter->iToChannels))

 		return iConverter;

 	delete iConverter;

 	iConverter=NULL;

 	iConverter = CMMFForwardingChannelAndSampleRateConverter::NewL(iFromRate, iFromChannels, iToRate, iToChannels);

 	return iConverter;

 	}

 // SetRates kept for BC reasons - populates publically visible properties

 void CMMFChannelAndSampleRateConverter::SetRates(TInt aFromRate,TInt aFromChannels,

 											 TInt aToRate,TInt aToChannels)

 	{

 	iFromRate=aFromRate;

 	iToRate=aToRate;

 	iFromChannels=aFromChannels;

 	iToChannels=aToChannels;

 	iRatio = (TReal)aFromRate / (TReal)aToRate;

 	TInt quotient = (TInt)iRatio;

 	TReal remainder = iRatio - (TReal)quotient;

 	iFraction = quotient * KMaxInt16Bit + (TInt32)(remainder * KMaxInt16Bit);

 	Reset();

 	}

 //

 // Forwarding converter - adapt to the implementation in audioutils.

 //

 CMMFForwardingChannelAndSampleRateConverter* CMMFForwardingChannelAndSampleRateConverter::NewL(TInt aFromRate,

 																							   TInt aFromChannels,

 										    			      								   TInt aToRate,

 										    			      								   TInt aToChannels)

 	{

 	CMMFForwardingChannelAndSampleRateConverter* self = new (ELeave) CMMFForwardingChannelAndSampleRateConverter;

 	CleanupStack::PushL(self);

 	self->ConstructL(aFromRate,aFromChannels,aToRate,aToChannels);

 	CleanupStack::Pop(self);

 	return self;

 	}

 CMMFForwardingChannelAndSampleRateConverter::CMMFForwardingChannelAndSampleRateConverter()

 	{

 	}

 void CMMFForwardingChannelAndSampleRateConverter::ConstructL(TInt aFromRate,

 															 TInt aFromChannels,

 										    			     TInt aToRate,

 										    			     TInt aToChannels)

 	{

 	SetRates(aFromRate, aFromChannels, aToRate, aToChannels); 

 		// delib called before iRealConverter created. Reset() will be no-op.

 		// this is preserved solely to keep BC with original API that exposes too much

 	iRealConverter = CChannelAndSampleRateConverter::CreateL(aFromRate,aFromChannels,aToRate,aToChannels);

 	}

 CMMFForwardingChannelAndSampleRateConverter::~CMMFForwardingChannelAndSampleRateConverter()

 	{

 	delete iRealConverter;

 	}

 TInt CMMFForwardingChannelAndSampleRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)

 	{

 	TInt ignore = iRealConverter->Convert(aSrcBuffer.Data(), aDstBuffer.Data());

 	// CChannelAndSampleRateConverter returns the source length converted

 	// while the old API wants the destination generated, so change. 

 	TInt result = aDstBuffer.Data().Length(); 

 	return result;

 	}

 void CMMFForwardingChannelAndSampleRateConverter::Reset()

 	{

 	// need to check iRealConverter created. Won't be true during construction

 	if (iRealConverter)

 		{

 		iRealConverter->Reset();

 		}

 	}

 TUint CMMFForwardingChannelAndSampleRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)

 	{

 	return TUint(iRealConverter->MaxConvertBufferSize(aSrcBufferSize));

 	}

 //

 // Old derivatives of CMMFChannelAndSampleRateConverter. These were previously returned by

 // CreateConverterL(). Kept for BC, but no longer used by main code.

 //

 TInt CMMFStereoToStereoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)

 	{

 	TInt32* aSrc = (TInt32*)aSrcBuffer.Data().Ptr();

 	TInt32* aDst = (TInt32*)aDstBuffer.Data().Ptr();

 	TUint aSamples = aSrcBuffer.Data().Length()/4;

 	TInt32* src = aSrc;

 	TInt32* dst = aDst;

 	TInt32* limit=src+aSamples;

 	// add left over from last buffer

 	TUint index = iIndex;

 	src = aSrc + (index>>16);

 	while(src<limit)

 		{

 		*dst++ = *src;

 		index += iFraction;

 		src = aSrc + (index>>16);

 		}

 	// get amount by which index exceeded end of buffer

 	// so that we can add it back to start of next buffer

 	iIndex = index - (aSamples << 16);

 	// return sample byte count and setup output buffer

 	TInt length = (dst-(TInt32*)aDst)*4;	//dealing with 32bit values so multiply by 4 for bytes

 	aDstBuffer.Data().SetLength(length); //adjust length of destination buffer

 	return (length);

 	}	

 TInt CMMFMonoToStereoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)

 	{

 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();

 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();

 	TUint aSamples = aSrcBuffer.Data().Length()/2;

 	TInt16* src = aSrc;

 	TInt16* dst = aDst;

 	TInt16* limit=aSrc+aSamples;

 	// add left over from last buffer

 	TUint index = iIndex;

 	src = aSrc + (index>>16);

 	while(src<limit)

 		{

 		*dst++ = *src;

 		*dst++ = *src;

 		index += iFraction;

 		src = aSrc + (index>>16);

 		}

 	// get amount by which index exceeded end of buffer

 	// so that we can add it back to start of next buffer

 	iIndex = index - (aSamples << 16);

 	// return sample byte count and setup output buffer

 	TInt length = (dst-aDst) * 2;		// size in bytes

 	aDstBuffer.Data().SetLength(length); //adjust length of destination buffer

 	return (length);

 	}	

 TUint CMMFMonoToStereoRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)

 	{

 	return aSrcBufferSize*2;

 	}

 TInt CMMFMonoToMonoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)

 	{

 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();

 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();

 	TUint aSamples = aSrcBuffer.Data().Length()/2;

 	TInt16* src = aSrc;

 	TInt16* dst = aDst;

 	TInt16* limit=aSrc+aSamples; //*2 ???

 	// add left over from last buffer

 	TUint index = iIndex;

 	src = aSrc + (index>>16);

 	while(src<limit)

 		{

   		*dst++ = *src;

 		index += iFraction;

 		src = aSrc + (index>>16);

 		}

 	// get amount by which index exceeded end of buffer

 	// so that we can add it back to start of next buffer

 	iIndex = index - (aSamples << 16);

 	// return sample byte count and setup output buffer

 	TInt length = (dst-aDst)*2;			// size in bytes

 	aDstBuffer.Data().SetLength(length); //adjust length of destination buffer

 	return (length);

 	}	

 //This method takes the left and right sample of interleaved PCM and sums it, then divides by 2

 TInt CMMFStereoToMonoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)

 	{

 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();

 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();

 	TUint aSamples = aSrcBuffer.Data().Length()/4;

 	TInt16* src = aSrc;

 	TInt16* limit=aSrc+aSamples*2;	//because 1 sample = two TInt16s

 	// add left over from last buffer

 	TUint index = iIndex;

 	src = aSrc + (index>>16)*2;

 	TInt length = 0;

 	while(src<limit)

 		{

 		*aDst++ = (TInt16)((src[0] + (src[1])) / 2);

 		index += iFraction;

 		src = aSrc + (index>>16)*2;

 		length++;

 		}

 	// get amount by which index exceeded end of buffer

 	// so that we can add it back to start of next buffer

 	iIndex = index - (aSamples << 16);

 	// return sample byte count and setup output buffer

 	aDstBuffer.Data().SetLength(length * 2); //adjust length of destination buffer

 	return (length);

 	}

 TUint CMMFStereoToMonoRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)

 	{

 	TUint size = aSrcBufferSize/2;

 	size += aSrcBufferSize & 1; //avoid round down error

 	return size;

 	}

 //This method takes the left and right sample of interleaved PCM and sums it, then divides by 2

 TInt CMMFStereoToMonoConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)

 	{

 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();

 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();

 	TUint aSamples = aSrcBuffer.Data().Length()/4;

 	for (TUint i=0;i<aSamples;i++)

 		{

 		*aDst++ = (TInt16)((aSrc[0] + (aSrc[1])) / 2);

 		aSrc+=2;

 		}

 	aDstBuffer.Data().SetLength(aSamples*2); //adjust length of destination buffer

 	return aSamples*2;

 	}	

 TUint CMMFStereoToMonoConverter::MaxConvertBufferSize(TUint aSrcBufferSize)

 	{

 	TUint size = aSrcBufferSize/2;

 	size += aSrcBufferSize & 1; //avoid round down error

 	return size;

 	}

 TInt CMMFMonoToStereoConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)

 	{

 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();

 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();

 	TUint aSamples = aSrcBuffer.Data().Length()/2;

 	for (TUint i=0;i<aSamples;i++)

 		{

 		*aDst++ = *aSrc;

 		*aDst++ = *aSrc++;

 		}

 	aDstBuffer.Data().SetLength(aSamples*4); //adjust length of destination buffer

 	return aSamples*4;

 	}	

 TUint CMMFMonoToStereoConverter::MaxConvertBufferSize(TUint aSrcBufferSize)

 	{

 	return aSrcBufferSize*2;

 	}