// 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:

//

#include "MMFpcm16ToPcmU8HwDevice.h"

/**

 *

 *	Returns the created hw device for signed pcm16 to unsigned pcm8 audio.

 *

 *	@return	"CMMFPcm16ToPcmU8HwDevice"

 *

 */

CMMFPcm16ToPcmU8HwDevice* CMMFPcm16ToPcmU8HwDevice::NewL()

	{

    CMMFPcm16ToPcmU8HwDevice* self = new (ELeave) CMMFPcm16ToPcmU8HwDevice();

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

/**

 *

 *	Second phase constructor.

 *

 */

void CMMFPcm16ToPcmU8HwDevice::ConstructL()

	{

    iCodec = new (ELeave) CMMFPcm16ToPcmU8Codec();

	}

/**

*

* ~CMMFPcm16ToPcmU8HwDevice

*/

CMMFPcm16ToPcmU8HwDevice::~CMMFPcm16ToPcmU8HwDevice()

	{

	//The codec is deleted in the base class CMMFSwCodecWrapper

	}

/**

*

* Codec

* @return 'CMMFSwCodec&'

*

*/

CMMFSwCodec& CMMFPcm16ToPcmU8HwDevice::Codec()

	{

	return *iCodec;

	}

/**

*

* ProcessL

* @param aSrc 

* @param aDst

* @return 'CMMFSwCodec::TCodecProcessResult'

*

*/

CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU8Codec::ProcessL(const CMMFBuffer& aSource, CMMFBuffer& aDest)

	{

	TCodecProcessResult result;

	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

	//convert from generic CMMFBuffer to CMMFDataBuffer

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

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

	if( !CheckPreconditions( src, dst ))

		{

		//[ precondition violation ]

		User::Leave( KErrArgument );

		}

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

	TInt noSamples = srcUse /2;

	iAudioS16ToU8Pcm.Convert(pSrc, pDst, noSamples );

	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

	result.iSrcBytesProcessed  = srcUse;

	result.iDstBytesAdded      = srcUse / 2;

	dst->Data().SetLength(result.iDstBytesAdded);

	//[ post conditions

    // srcbytes/2 == destbytes added

	// pos src == 0

	// pos dest == 0 ]

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

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

	__ASSERT_DEBUG( src->Data().Length()/2 == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));

	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 CMMFPcm16ToPcmU8Codec::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()/2 > aDestBuffer->Data().MaxLength() )

		{

		return result;

		}

	result = ETrue;  // preconditions have been satisfied

	return result;

	}