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