// Copyright (c) 2005-2009 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 "MmfBtAudioCodec.h"

#include <mmfpaniccodes.h>

#include "MmfBtImaAdpcmToPcm16HwDevice.h"

#include "../../MmfBtFileDependencyUtil.h"

/**

*

* NewL

*

*/

CMMFImaAdpcmToPcm16CodecHwDevice* CMMFImaAdpcmToPcm16CodecHwDevice::NewL()

	{

	CMMFImaAdpcmToPcm16CodecHwDevice* self=new(ELeave)CMMFImaAdpcmToPcm16CodecHwDevice();

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

/**

*

* ConstructL

*

*/

void CMMFImaAdpcmToPcm16CodecHwDevice::ConstructL()

	{

	iCodec = new (ELeave) CMMFImaAdpcmToPcm16Codec();

	}

/**

*

* ~CMMFMulawPcm16HwDevice

*

*/

CMMFImaAdpcmToPcm16CodecHwDevice::~CMMFImaAdpcmToPcm16CodecHwDevice()

	{

	}

/**

*

* Codec

*

*/

CMMFSwCodec &CMMFImaAdpcmToPcm16CodecHwDevice::Codec()

	{

	return *iCodec;

	}

/**

@see CMMFSwCodecWrapper::Start

this function sets SampleRate and Channels for CMMFImaAdpcmToPcm16Codec

*/

TInt CMMFImaAdpcmToPcm16CodecHwDevice::Start(TDeviceFunc aFuncCmd, TDeviceFlow aFlowCmd)

	{

	TInt err = CMMFSwCodecWrapper::Start(aFuncCmd, aFlowCmd);

	if (err != 0)

		return err;

	return ((CMMFImaAdpcmToPcm16Codec*)iCodec)->Configure(iChannels, iSampleRate);

	}

CMMFImaAdpcmToPcm16Codec::CMMFImaAdpcmToPcm16Codec()

	{

	iChannels = 1;

	iSampleRate = 0;

	iBlockAlign = KImaAdpcmBlockAlign;

	iSamplesPerBlock = KImaAdpcmSamplesPerBlock;

	}

/**

*

* 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 TCodecProcessResult

* This function converts IMA ADPCM samples to PCM samples.

*

*/

CMMFSwCodec::TCodecProcessResult CMMFImaAdpcmToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

	{

	CMMFSwCodec::TCodecProcessResult result;

	result.iCodecProcessStatus = 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;

	//convert from generic CMMFBuffer to CMMFDataBuffer

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

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

	if( !CheckPreconditions( src, dst ) )

		{

		//[ precondition(s) violation ]

		User::Leave(KErrArgument);

		}

	//calculate how much source is required to fill the destination buffer

	TUint blocksRemaining = src->Data().Length() / iBlockAlign;

	//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());

	//[ [process full blocks ]

	TUint dstBytesAdded = 0;

	for( TUint count = 0; count < blocksRemaining; count++ )

		{

		iImaAdpcmTo16Pcm.Convert(pSrc, pDst, iSamplesPerBlock);

		pSrc += iBlockAlign;

		pDst += (iSamplesPerBlock * sizeof(TInt16));

		dstBytesAdded += (iSamplesPerBlock * sizeof(TInt16));	

		}

	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;	

	result.iSrcBytesProcessed = blocksRemaining * iBlockAlign;

	result.iDstBytesAdded = dstBytesAdded;

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

	//[ check post conditions

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

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

	TInt r1 = src->Data().Length();

	r1 /= iBlockAlign;

	TInt r2 =  dst->Data().Length();

	r2 /=(iSamplesPerBlock * sizeof(TInt16));

	__ASSERT_DEBUG(  r1== r2, 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 CMMFImaAdpcmToPcm16Codec::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

	const TUint KTempBufferSize = iSamplesPerBlock * 2;

    TInt numInputSubFrames  = aSrcBuffer->Data().Length() / iBlockAlign;

	TInt numOutputSubFrames = aDestBuffer->Data().MaxLength() / KTempBufferSize;

	//[ we need modulo 1010 bytes on all src frames that are not the last

	// frame

	// For the last frame we will code only whole frames and effectively

	// drop any remaining samples]	

	TBool validInputDataLength = (aSrcBuffer->Data().Length() % iBlockAlign == 0) ;

	if( (numInputSubFrames > numOutputSubFrames) ||  // sufficient space in the output for the input

        (aSrcBuffer->Position() > 0 )  ||                   // position must be zero since we can eat all the data

		(aDestBuffer->Position() > 0 ) ||

		(!validInputDataLength))                         //position must be zero

		{

		return result;

		}

	result = ETrue;  // preconditions have been satisfied

	return result;

	}

TInt CMMFImaAdpcmToPcm16Codec::Configure(TUint aChannels, TUint aSampleRate)

	{

	iChannels = aChannels;

	iSampleRate = aSampleRate;

	switch (iSampleRate * iChannels)

		{

		case 8000: // fall through, same as 11025

		case 11025:

		case 16000:

			iBlockAlign = 256;

			break;

		case 22050:

			iBlockAlign = 512;

			break;

		case 44100:

			iBlockAlign = 1024;

			break;

		case 88200:

			iBlockAlign = 2048;

			break;

		default:

			return KErrArgument;

		}

	const TUint KImaAdpcmBitsPerSample = 4;

	// SamplesPerBlock = [(BlockAlign - 4 * Channels) * 8] / (BitsPerSample * Channels) + 1

	iSamplesPerBlock = (iBlockAlign - 4 * iChannels) * 8 / (KImaAdpcmBitsPerSample * iChannels) + 1;

	return KErrNone;

	}