// 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 "MMFAudioMuLawToS16PcmCodec.h"

/***

*

* Convert

*

*/

EXPORT_C void TMMFAudioMuLawToS16PcmCodec::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples)

	{

	ASSERT(aSrc);

	ASSERT(aDst);

	TInt pcm;

	while (aSamples--)

		{

		pcm = MulawSampleToPcm(*aSrc++);

		*aDst++ = STATIC_CAST( TUint8, pcm&KAndMask8bit);

		*aDst++ = STATIC_CAST( TUint8, pcm>>8);

		}

	}

/***

*

* MulawSampleToPcm

* @param aMuLaw

* @return TInt

*

*/

TInt TMMFAudioMuLawToS16PcmCodec::MulawSampleToPcm(TUint8 aMulaw)

	{

	TInt sign, exponent, mantissa, sample;

    aMulaw = STATIC_CAST( TUint8, ~aMulaw);

    sign = ( aMulaw & KMaskSign8bit );

    exponent = ( aMulaw >> 4 ) & 0x07;

    mantissa = aMulaw & 0x0F;

    sample = KExpLut[exponent] + ( mantissa << ( exponent + 3 ) );

    if ( sign != 0 )

		sample = -sample;

    return sample;

	}

const TInt TMMFAudioMuLawToS16PcmCodec::KExpLut[KMdaMulawTo16PcmExpLutSize] = 

	{

	0, 132, 396, 924, 1980, 4092, 8316, 16764

	};