// 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 "mmfpcm16topcmU16BEHwDevice.h"

/**

 *

 *	Returns the created hw device for passing audio through audio.

 *  for the wins implementation this would always be pcm16 although

 *  this is effectively a null hw device that will pass any datatype through

 *	@return	"CMMFPcm16ToPcmU16BEHwDevice"

 *

 */

CMMFPcm16ToPcmU16BEHwDevice* CMMFPcm16ToPcmU16BEHwDevice::NewL()

	{

    CMMFPcm16ToPcmU16BEHwDevice* self = new (ELeave) CMMFPcm16ToPcmU16BEHwDevice();

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

/**

*

* ~CMMFPcm16ToPcmU16BEHwDevice

*/

CMMFPcm16ToPcmU16BEHwDevice::~CMMFPcm16ToPcmU16BEHwDevice()

	{

	}

/**

*

* ConstructL

*

*/

void CMMFPcm16ToPcmU16BEHwDevice::ConstructL()

	{

	iCodec = new (ELeave) CMMFPcm16ToPcmU16BECodec();

	}

/**

*

* Codec

* @return 'CMMFSwCodec&'

*/

CMMFSwCodec& CMMFPcm16ToPcmU16BEHwDevice::Codec()

	{

	return *iCodec;

	}

/**

*

* ProcessL

* @param aSrc 

* @param aDst

* @pre position of buffer aSrc is 0

* @pre position of buffer aDst is 0

* @pre sufficient bytes in output to consume input

* @return 'CMMFSwCodec::TCodecProcessResult'

* this codec has a does not expand or shrink destination data

*/

CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU16BECodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

	{

	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 preconsitions ]

	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; // for pcm16 TInt16

	iAudioPcm16ToPcmU16Be.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 CMMFPcm16ToPcmU16BECodec::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 ) ) // must have pcm16 samples on input

		 {

		 return result;

		 }

	 result = ETrue;  // preconditions have been satisfied

	 return result;

	}