// 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 "MMFAudioCodec.h"

#include <mmf/common/mmfpaniccodes.h>

#include "MmfImaAdpcmtopcm16hwdevice.h"

#include <mmf/server/mmfswcodecwrappercustominterfacesuids.hrh>

/**

*

* 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;

	}

/**

Retrieves a custom interface to the device.

The reference CMMFImaAdpcmToPcm16CodecHwDevice supports one FileBlockLength custom interface,

or else calls two standard (CMMFSwCodecWrapper) custom interfaces,TPlayCustomInterface and TRecordCustomInterface.

@param	aInterface

		Interface UID, defined with the custom interface.

		aInterface = KUidCustomInterfaceDevSoundFileBlockLength,

		aInterface = KMmfPlayCustomInterface for TPlayCustomInterface,

		aInterface = KMmfRecordCustomInterface for TRecordCustomInterface.

@return A pointer to the interface implementation, The return value must be cast to the

		correct type by the user.

*/

TAny* CMMFImaAdpcmToPcm16CodecHwDevice::CustomInterface(TUid aInterfaceId)

	{

	if(aInterfaceId == KUidCustomInterfaceDevSoundFileBlockLength)

		{

		return static_cast<MMMFDevSoundCustomInterfaceFileBlockLength*>(this);

		}

	else

		{

		return CMMFSwCodecWrapper::CustomInterface(aInterfaceId);

		}

	}

/**

@see CMMFSwCodecWrapper::Start

this function sets SampleRate and Channels for CMMFImaAdpcmToPcm16Codec

*/

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

	{

	TInt err = static_cast<CMMFImaAdpcmToPcm16Codec*>(iCodec)->Configure(iChannels, iSampleRate, iBlockAlign);

	if (err == KErrNone)

		{

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

		}

	return err;

	}

/**

SetFileBlockLength

This function sets file's block length for CMMFImaAdpcmToPcm16CodecHwDevice

@param aBlockAlign

       The file's block length 

*/

void CMMFImaAdpcmToPcm16CodecHwDevice::SetFileBlockLength(TUint aBlockAlign)

	{

	iBlockAlign = aBlockAlign;

	}

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 = 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;

	}

/**

Configure

This function sets file's block length, channels & sample rate.

@param aChannels

       The file's number of channels

@param aSampleRate

       The file's sample rate 

@param aBlockAlign

       The file's block length 

*/

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

	{

	iChannels = aChannels;

	iSampleRate = aSampleRate;

	if (aBlockAlign < 256)	

		{

		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;

			}

		}

	else

		{

		iBlockAlign = aBlockAlign;

		}

	const TUint KImaAdpcmBitsPerSample = 4;

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

	return KErrNone;

	}