// Copyright (c) 2003-2009 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:

// MmfMulawToPcm16HwDevice.cpp

// 

//

#include "MMFAudioCodec.h"

#include <mmf/common/mmfpaniccodes.h>

#include "mmfpcm16SwapEndianhwdevice.h"

/**

*

* NewL

* @return 'CMMFPcm16SwapEndianHwDevice*'

*

*/

CMMFPcm16SwapEndianHwDevice* CMMFPcm16SwapEndianHwDevice::NewL()

	{

	CMMFPcm16SwapEndianHwDevice* self=new(ELeave) CMMFPcm16SwapEndianHwDevice();

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

/**

*

* ~CMMFPcm16SwapEndianHwDevice

*/

CMMFPcm16SwapEndianHwDevice::~CMMFPcm16SwapEndianHwDevice()

	{

	}

/**

*

* ConstructL

*

*/

void CMMFPcm16SwapEndianHwDevice::ConstructL()

	{

	iCodec = new (ELeave)CMMFPcm16SwapEndianCodec();

	}

/**

*

* Codec

*

*/

CMMFSwCodec &CMMFPcm16SwapEndianHwDevice::Codec()

	{

	return *iCodec;

	}

/**

*

* ProcessL

* @param aSrc

* @param aDst

* @return 'CMMFSwCodec::TCodecProcessResult'

*

*/

CMMFSwCodec::TCodecProcessResult CMMFPcm16SwapEndianCodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

	{

	CMMFSwCodec::TCodecProcessResult result;

	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

	//convert from generic CMMFBuffer to CMMFDataBuffer

	const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc);

	CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDst);

	//[ check the preconditions ]

	if( !CheckPreconditions( src, dst ))

		{

		//[ precondition violation ]

		User::Leave( KErrArgument );

		}

	TInt srcUse = src->Data().Length();

	//we need to cast away CONST even on the source, as the TClass needs a TUint8*	

	TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr());

	TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr());

	TInt noSamples = srcUse / 2; 	//divide by TWO as 2 bytes are equal to 1 sample

	iPcm16EndianSwap.Convert(pSrc, pDst, noSamples );

	result.iCodecProcessStatus  = TCodecProcessResult::EProcessComplete;

	result.iSrcBytesProcessed   = srcUse;

	result.iDstBytesAdded       = srcUse;

	dst->Data().SetLength(srcUse);

	//[ check post conditions ]

	__ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

	__ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

	__ASSERT_DEBUG( src->Data().Length() == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); 

	__ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // pcm output

	return result;

	}

/**

*

* Preconditions

* This methos tests the preconditions of the ProcessL method

* @return TBool ETrue for sucess and EFalse for failure of the preconditions

*

**/

TBool CMMFPcm16SwapEndianCodec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )

	{

	TBool result = EFalse;

	if(! aSrcBuffer )

		{

		return result;

		}

	if( ! aDestBuffer )

		{

		return result;

		}

	// Check position of src and dest are 0

	if( aSrcBuffer->Position() )

		{

		return result;

		}

	// Check position of src and dest are 0

	if( aDestBuffer->Position() )

		{

		return result;

		}

	// check there are sufficient bytes in the output to consume the input

	if( ( aSrcBuffer->Data().Length() > aDestBuffer->Data().MaxLength() ) ||

		( aSrcBuffer->Data().Length() % 2 != 0 ))

		{

		return result;

		}

	result = ETrue;  // preconditions have been satisfied

	return result;

	}