sl@0: // Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "MmfUtilities.h"
sl@0: #include "mmfutilitiespriv.h"
sl@0: #include "mmf/utils/rateconvert.h"
sl@0: 
sl@0: const TInt KMaxInt16Bit = 65536 ; //Maximum for a 16bit int
sl@0: 
sl@0: EXPORT_C CMMFChannelAndSampleRateConverterFactory::~CMMFChannelAndSampleRateConverterFactory()
sl@0: 	{
sl@0: 	delete iConverter;
sl@0: 	}
sl@0: 
sl@0: 	
sl@0: EXPORT_C CMMFChannelAndSampleRateConverter* CMMFChannelAndSampleRateConverterFactory::CreateConverterL(TInt aFromRate,TInt aFromChannels,
sl@0: 													   TInt aToRate,TInt aToChannels)
sl@0: 	{
sl@0: 	if(aFromRate<0 || aFromChannels<0 || aToRate<0 || aToChannels<0)
sl@0: 		{
sl@0: 		User::Leave(KErrArgument);
sl@0: 		}
sl@0: 
sl@0: 	iFromRate=aFromRate;
sl@0: 	iToRate=aToRate;
sl@0: 	iFromChannels=aFromChannels;
sl@0: 	iToChannels=aToChannels;
sl@0: 	return CreateConverterL();
sl@0: 	}
sl@0: 
sl@0: EXPORT_C CMMFChannelAndSampleRateConverter* CMMFChannelAndSampleRateConverterFactory::CreateConverterL()
sl@0: 	{
sl@0: 	if (iConverter
sl@0: 		&&(iFromRate==iConverter->iFromRate)
sl@0: 		&&(iToRate==iConverter->iToRate)
sl@0: 		&&(iFromChannels==iConverter->iFromChannels)
sl@0: 		&&(iToChannels==iConverter->iToChannels))
sl@0: 		return iConverter;
sl@0: 
sl@0: 	delete iConverter;
sl@0: 	iConverter=NULL;
sl@0: 	
sl@0: 	iConverter = CMMFForwardingChannelAndSampleRateConverter::NewL(iFromRate, iFromChannels, iToRate, iToChannels);
sl@0: 
sl@0: 	return iConverter;
sl@0: 	}
sl@0: 	
sl@0: // SetRates kept for BC reasons - populates publically visible properties
sl@0: 	
sl@0: void CMMFChannelAndSampleRateConverter::SetRates(TInt aFromRate,TInt aFromChannels,
sl@0: 											 TInt aToRate,TInt aToChannels)
sl@0: 	{
sl@0: 	iFromRate=aFromRate;
sl@0: 	iToRate=aToRate;
sl@0: 	iFromChannels=aFromChannels;
sl@0: 	iToChannels=aToChannels;
sl@0: 
sl@0: 	iRatio = (TReal)aFromRate / (TReal)aToRate;
sl@0: 
sl@0: 	TInt quotient = (TInt)iRatio;
sl@0: 	TReal remainder = iRatio - (TReal)quotient;
sl@0: 	iFraction = quotient * KMaxInt16Bit + (TInt32)(remainder * KMaxInt16Bit);
sl@0: 
sl@0: 	Reset();
sl@0: 	}
sl@0: 	
sl@0: //
sl@0: // Forwarding converter - adapt to the implementation in audioutils.
sl@0: //
sl@0: 	
sl@0: CMMFForwardingChannelAndSampleRateConverter* CMMFForwardingChannelAndSampleRateConverter::NewL(TInt aFromRate,
sl@0: 																							   TInt aFromChannels,
sl@0: 										    			      								   TInt aToRate,
sl@0: 										    			      								   TInt aToChannels)
sl@0: 	{
sl@0: 	CMMFForwardingChannelAndSampleRateConverter* self = new (ELeave) CMMFForwardingChannelAndSampleRateConverter;
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL(aFromRate,aFromChannels,aToRate,aToChannels);
sl@0: 	CleanupStack::Pop(self);
sl@0: 	return self;
sl@0: 	}
sl@0: 	
sl@0: CMMFForwardingChannelAndSampleRateConverter::CMMFForwardingChannelAndSampleRateConverter()
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: void CMMFForwardingChannelAndSampleRateConverter::ConstructL(TInt aFromRate,
sl@0: 															 TInt aFromChannels,
sl@0: 										    			     TInt aToRate,
sl@0: 										    			     TInt aToChannels)
sl@0: 	{
sl@0: 	SetRates(aFromRate, aFromChannels, aToRate, aToChannels); 
sl@0: 		// delib called before iRealConverter created. Reset() will be no-op.
sl@0: 		// this is preserved solely to keep BC with original API that exposes too much
sl@0: 	iRealConverter = CChannelAndSampleRateConverter::CreateL(aFromRate,aFromChannels,aToRate,aToChannels);
sl@0: 	}
sl@0: 	
sl@0: CMMFForwardingChannelAndSampleRateConverter::~CMMFForwardingChannelAndSampleRateConverter()
sl@0: 	{
sl@0: 	delete iRealConverter;
sl@0: 	}
sl@0: 	
sl@0: TInt CMMFForwardingChannelAndSampleRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
sl@0: 	{
sl@0: 	TInt ignore = iRealConverter->Convert(aSrcBuffer.Data(), aDstBuffer.Data());
sl@0: 	// CChannelAndSampleRateConverter returns the source length converted
sl@0: 	// while the old API wants the destination generated, so change. 
sl@0: 	TInt result = aDstBuffer.Data().Length(); 
sl@0: 	return result;
sl@0: 	}
sl@0: 	
sl@0: void CMMFForwardingChannelAndSampleRateConverter::Reset()
sl@0: 	{
sl@0: 	// need to check iRealConverter created. Won't be true during construction
sl@0: 	if (iRealConverter)
sl@0: 		{
sl@0: 		iRealConverter->Reset();
sl@0: 		}
sl@0: 	}
sl@0: 	
sl@0: TUint CMMFForwardingChannelAndSampleRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
sl@0: 	{
sl@0: 	return TUint(iRealConverter->MaxConvertBufferSize(aSrcBufferSize));
sl@0: 	}
sl@0: 	
sl@0: //
sl@0: // Old derivatives of CMMFChannelAndSampleRateConverter. These were previously returned by
sl@0: // CreateConverterL(). Kept for BC, but no longer used by main code.
sl@0: //
sl@0: 
sl@0: TInt CMMFStereoToStereoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
sl@0: 	{
sl@0: 	TInt32* aSrc = (TInt32*)aSrcBuffer.Data().Ptr();
sl@0: 	TInt32* aDst = (TInt32*)aDstBuffer.Data().Ptr();
sl@0: 	TUint aSamples = aSrcBuffer.Data().Length()/4;
sl@0: 
sl@0: 	TInt32* src = aSrc;
sl@0: 	TInt32* dst = aDst;
sl@0: 	TInt32* limit=src+aSamples;
sl@0: 	
sl@0: 	// add left over from last buffer
sl@0: 	TUint index = iIndex;
sl@0: 	src = aSrc + (index>>16);
sl@0: 
sl@0: 	while(src<limit)
sl@0: 		{
sl@0: 		*dst++ = *src;
sl@0: 		index += iFraction;
sl@0: 		src = aSrc + (index>>16);
sl@0: 		}
sl@0: 	
sl@0: 	// get amount by which index exceeded end of buffer
sl@0: 	// so that we can add it back to start of next buffer
sl@0: 	iIndex = index - (aSamples << 16);
sl@0: 
sl@0: 	// return sample byte count and setup output buffer
sl@0: 	TInt length = (dst-(TInt32*)aDst)*4;	//dealing with 32bit values so multiply by 4 for bytes
sl@0: 	aDstBuffer.Data().SetLength(length); //adjust length of destination buffer
sl@0: 	return (length);
sl@0: 	}	
sl@0: 
sl@0: TInt CMMFMonoToStereoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
sl@0: 	{
sl@0: 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
sl@0: 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
sl@0: 	TUint aSamples = aSrcBuffer.Data().Length()/2;
sl@0: 
sl@0: 	TInt16* src = aSrc;
sl@0: 	TInt16* dst = aDst;
sl@0: 	TInt16* limit=aSrc+aSamples;
sl@0: 
sl@0: 	// add left over from last buffer
sl@0: 	TUint index = iIndex;
sl@0: 	src = aSrc + (index>>16);
sl@0: 
sl@0: 	while(src<limit)
sl@0: 		{
sl@0: 		*dst++ = *src;
sl@0: 		*dst++ = *src;
sl@0: 		index += iFraction;
sl@0: 		src = aSrc + (index>>16);
sl@0: 		}
sl@0: 
sl@0: 	// get amount by which index exceeded end of buffer
sl@0: 	// so that we can add it back to start of next buffer
sl@0: 	iIndex = index - (aSamples << 16);
sl@0: 
sl@0: 	// return sample byte count and setup output buffer
sl@0: 	TInt length = (dst-aDst) * 2;		// size in bytes
sl@0: 	aDstBuffer.Data().SetLength(length); //adjust length of destination buffer
sl@0: 	return (length);
sl@0: 	}	
sl@0: 	
sl@0: 
sl@0: TUint CMMFMonoToStereoRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
sl@0: 	{
sl@0: 	return aSrcBufferSize*2;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: TInt CMMFMonoToMonoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
sl@0: 	{
sl@0: 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
sl@0: 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
sl@0: 	TUint aSamples = aSrcBuffer.Data().Length()/2;
sl@0: 
sl@0: 	TInt16* src = aSrc;
sl@0: 	TInt16* dst = aDst;
sl@0: 	TInt16* limit=aSrc+aSamples; //*2 ???
sl@0: 
sl@0: 	// add left over from last buffer
sl@0: 	TUint index = iIndex;
sl@0: 	src = aSrc + (index>>16);
sl@0: 
sl@0: 	while(src<limit)
sl@0: 		{
sl@0:   		*dst++ = *src;
sl@0: 		index += iFraction;
sl@0: 		src = aSrc + (index>>16);
sl@0: 		}
sl@0: 
sl@0: 	// get amount by which index exceeded end of buffer
sl@0: 	// so that we can add it back to start of next buffer
sl@0: 	iIndex = index - (aSamples << 16);
sl@0: 
sl@0: 	// return sample byte count and setup output buffer
sl@0: 	TInt length = (dst-aDst)*2;			// size in bytes
sl@0: 	aDstBuffer.Data().SetLength(length); //adjust length of destination buffer
sl@0: 	return (length);
sl@0: 	}	
sl@0: 
sl@0: //This method takes the left and right sample of interleaved PCM and sums it, then divides by 2
sl@0: TInt CMMFStereoToMonoRateConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
sl@0: 	{
sl@0: 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
sl@0: 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
sl@0: 	TUint aSamples = aSrcBuffer.Data().Length()/4;
sl@0: 
sl@0: 	TInt16* src = aSrc;
sl@0: 	TInt16* limit=aSrc+aSamples*2;	//because 1 sample = two TInt16s
sl@0: 
sl@0: 	// add left over from last buffer
sl@0: 	TUint index = iIndex;
sl@0: 	src = aSrc + (index>>16)*2;
sl@0: 
sl@0: 	TInt length = 0;
sl@0: 
sl@0: 	while(src<limit)
sl@0: 		{
sl@0: 		*aDst++ = (TInt16)((src[0] + (src[1])) / 2);
sl@0: 		index += iFraction;
sl@0: 		src = aSrc + (index>>16)*2;
sl@0: 		length++;
sl@0: 		}
sl@0: 	// get amount by which index exceeded end of buffer
sl@0: 	// so that we can add it back to start of next buffer
sl@0: 	iIndex = index - (aSamples << 16);
sl@0: 
sl@0: 	// return sample byte count and setup output buffer
sl@0: 	aDstBuffer.Data().SetLength(length * 2); //adjust length of destination buffer
sl@0: 	return (length);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: TUint CMMFStereoToMonoRateConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
sl@0: 	{
sl@0: 	TUint size = aSrcBufferSize/2;
sl@0: 	size += aSrcBufferSize & 1; //avoid round down error
sl@0: 	return size;
sl@0: 	}
sl@0: 
sl@0: //This method takes the left and right sample of interleaved PCM and sums it, then divides by 2
sl@0: TInt CMMFStereoToMonoConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
sl@0: 	{
sl@0: 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
sl@0: 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
sl@0: 	TUint aSamples = aSrcBuffer.Data().Length()/4;
sl@0: 	for (TUint i=0;i<aSamples;i++)
sl@0: 		{
sl@0: 		*aDst++ = (TInt16)((aSrc[0] + (aSrc[1])) / 2);
sl@0: 		aSrc+=2;
sl@0: 		}
sl@0: 	aDstBuffer.Data().SetLength(aSamples*2); //adjust length of destination buffer
sl@0: 	return aSamples*2;
sl@0: 	}	
sl@0: 
sl@0: TUint CMMFStereoToMonoConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
sl@0: 	{
sl@0: 	TUint size = aSrcBufferSize/2;
sl@0: 	size += aSrcBufferSize & 1; //avoid round down error
sl@0: 	return size;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: TInt CMMFMonoToStereoConverter::Convert(const CMMFDataBuffer& aSrcBuffer, CMMFDataBuffer& aDstBuffer)
sl@0: 	{
sl@0: 	TInt16* aSrc = (TInt16*)aSrcBuffer.Data().Ptr();
sl@0: 	TInt16* aDst = (TInt16*)aDstBuffer.Data().Ptr();
sl@0: 	TUint aSamples = aSrcBuffer.Data().Length()/2;
sl@0: 	for (TUint i=0;i<aSamples;i++)
sl@0: 		{
sl@0: 		*aDst++ = *aSrc;
sl@0: 		*aDst++ = *aSrc++;
sl@0: 		}
sl@0: 	aDstBuffer.Data().SetLength(aSamples*4); //adjust length of destination buffer
sl@0: 	return aSamples*4;
sl@0: 	}	
sl@0: 
sl@0: TUint CMMFMonoToStereoConverter::MaxConvertBufferSize(TUint aSrcBufferSize)
sl@0: 	{
sl@0: 	return aSrcBufferSize*2;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: