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// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include "MMFAudioMuLawToS16PcmCodec.h"
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/***
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*
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* Convert
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*
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*/
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EXPORT_C void TMMFAudioMuLawToS16PcmCodec::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples)
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{
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ASSERT(aSrc);
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ASSERT(aDst);
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TInt pcm;
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while (aSamples--)
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{
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pcm = MulawSampleToPcm(*aSrc++);
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*aDst++ = STATIC_CAST( TUint8, pcm&KAndMask8bit);
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*aDst++ = STATIC_CAST( TUint8, pcm>>8);
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}
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}
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/***
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*
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* MulawSampleToPcm
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* @param aMuLaw
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* @return TInt
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*
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*/
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TInt TMMFAudioMuLawToS16PcmCodec::MulawSampleToPcm(TUint8 aMulaw)
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{
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TInt sign, exponent, mantissa, sample;
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aMulaw = STATIC_CAST( TUint8, ~aMulaw);
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sign = ( aMulaw & KMaskSign8bit );
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exponent = ( aMulaw >> 4 ) & 0x07;
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mantissa = aMulaw & 0x0F;
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sample = KExpLut[exponent] + ( mantissa << ( exponent + 3 ) );
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if ( sign != 0 )
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sample = -sample;
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return sample;
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}
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const TInt TMMFAudioMuLawToS16PcmCodec::KExpLut[KMdaMulawTo16PcmExpLutSize] =
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{
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0, 132, 396, 924, 1980, 4092, 8316, 16764
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};
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