1 /*

     2 * Copyright (c) 1997-2002 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 */

    17 

    18 

    19 #include "MMFAlawToPcm16Codec.h"

    20 #include <ecom/implementationproxy.h>

    21 

    22 // __________________________________________________________________________

    23 // Implementation

    24 

    25 CMMFCodec* CMMFAlawPcm16Codec::NewL(TAny* aInitParams)

    26 	{

    27 	CMMFAlawPcm16Codec* self=new(ELeave) CMMFAlawPcm16Codec();

    28 	CleanupStack::PushL(self);

    29 	self->ConstructL(aInitParams);

    30 	CleanupStack::Pop(self);

    31 	return STATIC_CAST( CMMFCodec*, self );

    32 	}

    33 

    34 CMMFAlawPcm16Codec::~CMMFAlawPcm16Codec()

    35 	{

    36 	}

    37 

    38 CMMFAlawPcm16Codec::CMMFAlawPcm16Codec()

    39 	{

    40 	}

    41 

    42 void CMMFAlawPcm16Codec::ConstructL(TAny* /*aInitParams*/)

    43 	{

    44 	}

    45 

    46 //this codec converts 1 byte to 2 bytes

    47 TCodecProcessResult CMMFAlawPcm16Codec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    48 	{

    49 

    50 	TCodecProcessResult result;

    51 	result.iStatus = TCodecProcessResult::EProcessIncomplete;

    52 

    53 	//convert from generic CMMFBuffer to CMMFDataBuffer

    54 	iSrc = STATIC_CAST(const CMMFDataBuffer*, &aSrc);

    55 	iDst = STATIC_CAST(CMMFDataBuffer*, &aDst);

    56 

    57 	const TUint dstMaxLen = iDst->Data().MaxLength();

    58 

    59 	if (!dstMaxLen)

    60 		User::Leave(KErrArgument);

    61 

    62 	//don't scribble Destination (pDst) by only consuming enough source to fill pDst

    63 	TUint srcUse = (dstMaxLen - iDst->Position()) / 2;

    64 	const TUint srcLen = iSrc->Data().Length();

    65 	const TUint sourceRemain = srcLen - iSrc->Position();

    66 

    67 	//make sure we don't blow source by checking against remaining

    68 	//and clipping to minimum remaining if necessary

    69 	srcUse = (srcUse<sourceRemain ? srcUse : sourceRemain);

    70 	

    71 	//we need to cast away CONST even on the source, as the TClass needs a TUint8*

    72 	TUint8* pSrc = CONST_CAST(TUint8*,iSrc->Data().Ptr());

    73 	pSrc += iSrc->Position();

    74 	TUint8* pDst = CONST_CAST(TUint8*,iDst->Data().Ptr());

    75 	pDst += iDst->Position();

    76 

    77 

    78 	iAlawTo16Pcm.Convert(pSrc, pDst, srcUse );

    79 

    80 	if ((srcUse * 2) + iDst->Position() < dstMaxLen)

    81 		result.iStatus = TCodecProcessResult::EDstNotFilled;

    82 

    83 	else if (srcUse + iSrc->Position() >= srcLen)

    84 		result.iStatus = TCodecProcessResult::EProcessComplete;

    85 

    86 	result.iSrcBytesProcessed = srcUse;

    87 	result.iDstBytesAdded = srcUse * 2;

    88 

    89 	iDst->Data().SetLength(iDst->Position() + (srcUse * 2));

    90 

    91 	return result;

    92 	}

    93 

    94