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 

    20 #include "MMFAudioPCM16SwapEndianCodec.h"

    21 

    22 // __________________________________________________________________________

    23 // Implementation

    24 

    25 CMMFAudio16PcmSwapEndianCodec* CMMFAudio16PcmSwapEndianCodec::NewL(TAny* aInitParams)

    26 	{

    27 	CMMFAudio16PcmSwapEndianCodec* self=new(ELeave) CMMFAudio16PcmSwapEndianCodec();

    28 	CleanupStack::PushL(self);

    29 	self->ConstructL(aInitParams);

    30 	CleanupStack::Pop(self);

    31 	return self;

    32 	}

    33 

    34 CMMFAudio16PcmSwapEndianCodec::~CMMFAudio16PcmSwapEndianCodec()

    35 	{

    36 	}

    37 

    38 CMMFAudio16PcmSwapEndianCodec::CMMFAudio16PcmSwapEndianCodec()

    39 	{

    40 	}

    41 

    42 void CMMFAudio16PcmSwapEndianCodec::ConstructL(TAny* /*aInitParams*/)

    43 	{

    44 	}

    45 

    46 

    47 //this codec has a does not expand or shrink destination data

    48 TCodecProcessResult CMMFAudio16PcmSwapEndianCodec::ProcessL(const CMMFBuffer& aSrc, CMMFBuffer& aDst)

    49 	{

    50 

    51 	TCodecProcessResult result;

    52 	result.iStatus = TCodecProcessResult::EProcessIncomplete;

    53 

    54 	//convert from generic CMMFBuffer to CMMFDataBuffer

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

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

    57 

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

    59 

    60 	if (!dstMaxLen)

    61 		User::Leave(KErrArgument);

    62 

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

    64  	TUint srcUse = dstMaxLen - iDst->Position();

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

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

    67 

    68 

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

    70 	//and clipping to minimum remaining if necessary

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

    72 	

    73 	

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

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

    76 	pSrc += iSrc->Position();

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

    78 	pDst += iDst->Position();

    79 

    80 	//divide by TWO as 2 bytes are equal to 1 sample

    81 	i16PcmTo16PcmSwap.Convert(pSrc, pDst, srcUse / 2);

    82 

    83 	if (srcUse + iDst->Position() < dstMaxLen)

    84 		result.iStatus = TCodecProcessResult::EDstNotFilled;

    85 

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

    87 		result.iStatus = TCodecProcessResult::EProcessComplete;

    88 

    89 	result.iSrcBytesProcessed = srcUse;

    90 	result.iDstBytesAdded = srcUse;

    91 

    92 	iDst->Data().SetLength(iDst->Position() + srcUse);

    93 

    94 	return result;

    95 

    96 	}