// 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;

 	}