--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmlibs/mmfw/src/Plugin/Codec/audio/MMFPcm16ToImaAdPcmStereoCodec.cpp	Tue Feb 02 01:56:55 2010 +0200
@@ -0,0 +1,170 @@
+/*
+* Copyright (c) 1997-2002 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 "MMFPcm16ToImaAdPcmStereoCodec.h"
+
+// __________________________________________________________________________
+// Implementation
+
+CMMFCodec* CMMFPcm16ImaAdPcmStereoCodec::NewL(TAny* aInitParams)
+	{
+	CMMFPcm16ImaAdPcmStereoCodec* self=new(ELeave) CMMFPcm16ImaAdPcmStereoCodec();
+	CleanupStack::PushL(self);
+	self->ConstructL(aInitParams);
+	CleanupStack::Pop(self);
+	return STATIC_CAST( CMMFCodec*, self );
+	}
+
+CMMFPcm16ImaAdPcmStereoCodec::~CMMFPcm16ImaAdPcmStereoCodec()
+	{
+	}
+
+CMMFPcm16ImaAdPcmStereoCodec::CMMFPcm16ImaAdPcmStereoCodec() : i16PcmToImaAdpcm(2)
+	{
+	}
+
+void CMMFPcm16ImaAdPcmStereoCodec::ConstructL(TAny*  /*aInitParams*/)
+	{
+	iTempSrcBufferPtr = iTempSrcBuffer;
+	iTempSrcBufferCount = 0;
+	}
+
+/*************************************************************
+CMMFPcm16ImaAdPcmStereoCodec::ProcessL
+
+This function converts stereo PCM samples to IMA ADPCM samples 
+in blocks of KImaAdpcmBlockAlign (256) bytes. Any left 
+over bytes that do not fill a block are currently discarded. 
+996 source bytes are required to fill a 256 byte block.
+**************************************************************/
+TCodecProcessResult CMMFPcm16ImaAdPcmStereoCodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)
+	{
+	TCodecProcessResult result;
+	result.iStatus = TCodecProcessResult::EProcessIncomplete;
+
+	//convert from generic CMMFBuffer to CMMFDataBuffer
+	iSrc = STATIC_CAST(const CMMFDataBuffer*, &aSrc);
+	iDst = STATIC_CAST(CMMFDataBuffer*, &aDst);
+
+	const TUint srcLen = iSrc->Data().Length();
+	const TUint dstMaxLen = iDst->Data().MaxLength();
+	const TUint sourceRemain = srcLen - iSrc->Position();
+
+	if (dstMaxLen < KImaAdpcmBlockAlign)
+		User::Leave(KErrArgument);
+
+	//reset data if not a consecutive frame number
+	if ((iSrc->FrameNumber() != iLastFrameNumber) && (iSrc->FrameNumber() != (iLastFrameNumber+1)))
+		{
+		iTempSrcBufferPtr = iTempSrcBuffer;
+		iTempSrcBufferCount = 0;
+		}
+	iLastFrameNumber = iSrc->FrameNumber();
+
+	TUint dstRemain = (dstMaxLen - iDst->Position());	
+	TUint srcToFillTempBuffer = 0;
+
+	//take account of src to be added to temporary buffer
+	if (iTempSrcBufferCount > 0)
+		{
+		srcToFillTempBuffer = KImaAdpcmStereoTempBufferSize - iTempSrcBufferCount;
+
+		if (srcToFillTempBuffer<sourceRemain) //enough source to fill temporary buffer
+			dstRemain -= KImaAdpcmBlockAlign;
+		else //not enough source to fill the temporary buffer
+			srcToFillTempBuffer = sourceRemain;
+		}
+
+	//calculate how much source is required to fill the destination buffer
+	TUint blocksRemaining = dstRemain/KImaAdpcmBlockAlign;
+	TUint maxUsableDst = blocksRemaining * KImaAdpcmBlockAlign;
+	TUint srcToUse = blocksRemaining * KImaAdpcmStereoSamplesPerBlock * 4;
+
+	srcToUse += srcToFillTempBuffer;
+	srcToUse = (srcToUse<sourceRemain ? srcToUse : sourceRemain);
+
+	//we need to cast away CONST even on the source, as the TClass needs a TUint8*
+	TUint8* pSrc = CONST_CAST(TUint8*,iSrc->Data().Ptr());
+	pSrc += iSrc->Position();
+	TUint8* pDst = CONST_CAST(TUint8*,iDst->Data().Ptr());
+	pDst += iDst->Position();
+	
+	TUint dstBytesAdded = 0;
+	TUint srcLeft = srcToUse;
+
+	//convert remaining source from previous call to ProcessL
+	if (iTempSrcBufferCount > 0)
+		{
+		//Fill temp buffer from source buffer
+		while((iTempSrcBufferCount < KImaAdpcmStereoTempBufferSize) && (srcLeft))
+			{
+			*iTempSrcBufferPtr++ = *pSrc++;
+			iTempSrcBufferCount++;
+			srcLeft--;
+			}
+
+		if (iTempSrcBufferCount == KImaAdpcmStereoTempBufferSize)
+			{
+			//reset
+			iTempSrcBufferCount = 0;
+			iTempSrcBufferPtr = iTempSrcBuffer;
+
+			i16PcmToImaAdpcm.Convert(iTempSrcBufferPtr, pDst, KImaAdpcmStereoSamplesPerBlock);
+
+			pDst += KImaAdpcmBlockAlign;
+			dstBytesAdded += KImaAdpcmBlockAlign;
+			}
+		}
+
+	//convert full blocks
+	while (srcLeft >= (KImaAdpcmStereoSamplesPerBlock*4)) 
+		{
+		i16PcmToImaAdpcm.Convert(pSrc, pDst, KImaAdpcmStereoSamplesPerBlock);
+
+		pSrc += KImaAdpcmStereoSamplesPerBlock*4;
+		pDst += KImaAdpcmBlockAlign;
+
+		dstBytesAdded += KImaAdpcmBlockAlign;	
+		srcLeft -= KImaAdpcmStereoSamplesPerBlock*4;	
+		}
+
+	//save remaining source in iTempSrcBuffer
+	while (srcLeft)
+		{
+		*iTempSrcBufferPtr++ = *pSrc++;
+		iTempSrcBufferCount++;
+		srcLeft--;
+		}
+
+	//if the source buffer is consumed
+	if ((srcLen == srcToUse + iSrc->Position()))
+		{
+		if (dstBytesAdded < maxUsableDst)
+			result.iStatus = TCodecProcessResult::EDstNotFilled;
+		else
+			result.iStatus = TCodecProcessResult::EProcessComplete;
+		}
+
+	result.iSrcBytesProcessed = srcToUse;
+	result.iDstBytesAdded = dstBytesAdded;
+
+	iDst->Data().SetLength(iDst->Position() + result.iDstBytesAdded);
+
+	return result;
+	}