sl@0: // Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "MMFAudioCodec.h"
sl@0: #include <mmf/common/mmfpaniccodes.h>
sl@0: #include "MmfALawToPcm16HwDevice.h"
sl@0: 
sl@0: 
sl@0: /**
sl@0: *
sl@0: * NewL
sl@0: *
sl@0: */
sl@0: CMMFAlawToPcm16CodecHwDevice* CMMFAlawToPcm16CodecHwDevice::NewL()
sl@0: 	{
sl@0: 	CMMFAlawToPcm16CodecHwDevice* self=new(ELeave) CMMFAlawToPcm16CodecHwDevice();
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL();
sl@0: 	CleanupStack::Pop(self);
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * ~CMMFAlawPcm16HwDevice
sl@0: *
sl@0: */
sl@0: CMMFAlawToPcm16CodecHwDevice::~CMMFAlawToPcm16CodecHwDevice()
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * ConstructL
sl@0: *
sl@0: */
sl@0: void CMMFAlawToPcm16CodecHwDevice::ConstructL()
sl@0: 	{
sl@0: 	iCodec = new (ELeave) CMMFAlawToPcm16Codec();
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * Codec
sl@0: *
sl@0: */
sl@0: CMMFSwCodec &CMMFAlawToPcm16CodecHwDevice::Codec()
sl@0: 	{
sl@0: 	return *iCodec;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * ProcessL
sl@0: * @param aSrc
sl@0: * @param aDst
sl@0: * @pre position of buffer aSrc is 0
sl@0: * @pre position of buffer aDst is 0
sl@0: * @pre sufficient bytes in output to consume input
sl@0: * @return TCodecProcessResult
sl@0: *
sl@0: */
sl@0: CMMFSwCodec::TCodecProcessResult CMMFAlawToPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)
sl@0: 	{
sl@0: 	CMMFSwCodec::TCodecProcessResult result;
sl@0: 	result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
sl@0: 	
sl@0: 	//convert from generic CMMFBuffer to CMMFDataBuffer
sl@0: 	const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSrc);
sl@0: 	CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDst);
sl@0: 	
sl@0: 	if( !CheckPreconditions( src, dst ))
sl@0: 		{
sl@0: 		//[ precondition violation ]
sl@0: 		User::Leave( KErrArgument );
sl@0: 		}
sl@0: 		
sl@0: 	//we need to cast away CONST even on the source, as the TClass needs a TUint8*
sl@0: 	TUint8* pSrc = CONST_CAST(TUint8*,src->Data().Ptr());
sl@0: 	TUint8* pDst = CONST_CAST(TUint8*,dst->Data().Ptr());
sl@0: 	TInt noSamples = src->Data().Length();
sl@0: 	iAlawTo16Pcm.Convert(pSrc, pDst, noSamples );
sl@0: 	
sl@0: 	TUint dstBytesAdded = noSamples*sizeof(TInt16);
sl@0: 	
sl@0: 	result.iCodecProcessStatus  = TCodecProcessResult::EProcessComplete;	
sl@0: 	result.iSrcBytesProcessed   = src->Data().Length();
sl@0: 	result.iDstBytesAdded       = dstBytesAdded;
sl@0: 	
sl@0: 	dst->Data().SetLength(dstBytesAdded);
sl@0: 
sl@0: 	//[ check post conditions ]
sl@0: 	__ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
sl@0: 	__ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
sl@0: 	__ASSERT_DEBUG( src->Data().Length() == dst->Data().Length()/2, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // 2 here signifies sizeof TInt16
sl@0: 	__ASSERT_DEBUG( dst->Data().Length() % 2 == 0, TMmfAudioCodecPanicsNameSpace::Panic( 	TMmfAudioCodecPanicsNameSpace::EPostConditionViolation )); // pcm output
sl@0: 
sl@0: 	return result;
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: *
sl@0: * Preconditions
sl@0: * This methos tests the preconditions of the ProcessL method
sl@0: * @return TBool ETrue for sucess and EFalse for failure of the preconditions
sl@0: *
sl@0: **/
sl@0: TBool CMMFAlawToPcm16Codec::CheckPreconditions( const CMMFDataBuffer* aSrcBuffer, CMMFDataBuffer* aDestBuffer )
sl@0: 	{
sl@0:      TBool result = EFalse;
sl@0: 	 
sl@0: 	 if(! aSrcBuffer )
sl@0: 		 {
sl@0: 		 return result;
sl@0: 		 }
sl@0: 
sl@0: 	 if( ! aDestBuffer )
sl@0: 		 {
sl@0: 		 return result;
sl@0: 		 }
sl@0: 
sl@0: 	 // Check position of src and dest are 0
sl@0: 	 if( aSrcBuffer->Position() )
sl@0: 		 {
sl@0: 		 return result;
sl@0: 		 }
sl@0: 
sl@0: 	  // Check position of src and dest are 0
sl@0: 	 if( aDestBuffer->Position() )
sl@0: 		 {
sl@0: 		 return result;
sl@0: 		 }
sl@0: 
sl@0: 	 // check there are sufficient bytes in the output to consume the input
sl@0:      if( aSrcBuffer->Data().Length() * 2 > aDestBuffer->Data().MaxLength() )
sl@0: 		 {
sl@0: 		 return result;
sl@0: 		 }
sl@0: 
sl@0: 	 result = ETrue;  // preconditions have been satisfied
sl@0: 
sl@0: 	 return result;
sl@0: 	}