// 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 "MMFpcm16ToPcmU8HwDevice.h"
/**
*
* Returns the created hw device for signed pcm16 to unsigned pcm8 audio.
*
* @return "CMMFPcm16ToPcmU8HwDevice"
*
*/
CMMFPcm16ToPcmU8HwDevice* CMMFPcm16ToPcmU8HwDevice::NewL()
{
CMMFPcm16ToPcmU8HwDevice* self = new (ELeave) CMMFPcm16ToPcmU8HwDevice();
CleanupStack::PushL(self);
self->ConstructL();
CleanupStack::Pop(self);
return self;
}
/**
*
* Second phase constructor.
*
*/
void CMMFPcm16ToPcmU8HwDevice::ConstructL()
{
iCodec = new (ELeave) CMMFPcm16ToPcmU8Codec();
}
/**
*
* ~CMMFPcm16ToPcmU8HwDevice
*/
CMMFPcm16ToPcmU8HwDevice::~CMMFPcm16ToPcmU8HwDevice()
{
//The codec is deleted in the base class CMMFSwCodecWrapper
}
/**
*
* Codec
* @return 'CMMFSwCodec&'
*
*/
CMMFSwCodec& CMMFPcm16ToPcmU8HwDevice::Codec()
{
return *iCodec;
}
/**
*
* ProcessL
* @param aSrc
* @param aDst
* @return 'CMMFSwCodec::TCodecProcessResult'
*
*/
CMMFSwCodec::TCodecProcessResult CMMFPcm16ToPcmU8Codec::ProcessL(const CMMFBuffer& aSource, CMMFBuffer& aDest)
{
TCodecProcessResult result;
result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
//convert from generic CMMFBuffer to CMMFDataBuffer
const CMMFDataBuffer* src = STATIC_CAST(const CMMFDataBuffer*, &aSource);
CMMFDataBuffer* dst = STATIC_CAST(CMMFDataBuffer*, &aDest);
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;
iAudioS16ToU8Pcm.Convert(pSrc, pDst, noSamples );
result.iCodecProcessStatus = TCodecProcessResult::EProcessComplete;
result.iSrcBytesProcessed = srcUse;
result.iDstBytesAdded = srcUse / 2;
dst->Data().SetLength(result.iDstBytesAdded);
//[ post conditions
// srcbytes/2 == destbytes added
// pos src == 0
// pos dest == 0 ]
__ASSERT_DEBUG( (src->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
__ASSERT_DEBUG( (dst->Position() == 0), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
__ASSERT_DEBUG( src->Data().Length()/2 == dst->Data().Length(), TMmfAudioCodecPanicsNameSpace::Panic( TMmfAudioCodecPanicsNameSpace::EPostConditionViolation ));
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 CMMFPcm16ToPcmU8Codec::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()/2 > aDestBuffer->Data().MaxLength() )
{
return result;
}
result = ETrue; // preconditions have been satisfied
return result;
}