1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/mm/mmlibs/mmfw/Codecs/Src/MMFCodecCommon/MMFAudioSPcm16ToMuLawCodec.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,79 @@
     1.4 +// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +//
    1.18 +
    1.19 +#include "MMFAudioSPcm16ToMuLawCodec.h"
    1.20 +
    1.21 +/***
    1.22 +*
    1.23 +* Convert
    1.24 +*
    1.25 +*/
    1.26 +EXPORT_C void TMMFAudioSPcm16ToMuLawCodec::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples)
    1.27 +	{
    1.28 +	TInt pcm;
    1.29 +	while (aSamples--)
    1.30 +		{
    1.31 +		pcm = (aSrc[0]+(aSrc[1]<<8));
    1.32 +		*aDst++ = PcmSampleToMuLaw(STATIC_CAST(TInt16 , pcm));
    1.33 +		aSrc+=2;
    1.34 +		}
    1.35 +	}
    1.36 +
    1.37 +//[ conversion look up table pcm16 to Mulaw ]
    1.38 +const TInt8 TMMFAudioSPcm16ToMuLawCodec::KExpLut[] = 
    1.39 +	{
    1.40 +	0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
    1.41 +	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
    1.42 +	5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
    1.43 +	5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
    1.44 +	6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
    1.45 +	6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
    1.46 +	6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
    1.47 +	6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
    1.48 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
    1.49 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
    1.50 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
    1.51 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
    1.52 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
    1.53 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
    1.54 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
    1.55 +	7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
    1.56 +	};
    1.57 +
    1.58 +/***
    1.59 +*
    1.60 +* PcmSampleToMulaw
    1.61 +* @param Mulaw
    1.62 +* @return TUint8
    1.63 +*
    1.64 +*/
    1.65 +TUint8 TMMFAudioSPcm16ToMuLawCodec::PcmSampleToMuLaw(TInt aPcm)
    1.66 +	{
    1.67 +    TInt sign, exponent, mantissa;
    1.68 +    TUint8 ulawbyte;
    1.69 +
    1.70 +    sign = (aPcm >> 8) & KMaskSign8bit;		
    1.71 +    if ( sign != 0 )
    1.72 +		aPcm = STATIC_CAST( TUint16,-aPcm);
    1.73 +	if ( STATIC_CAST(TUint , aPcm) > STATIC_CAST(TUint , KMda16PcmToMulawClip ))
    1.74 +		aPcm = KMda16PcmToMulawClip;	
    1.75 +
    1.76 +    aPcm = STATIC_CAST(TInt16 , aPcm + KMda16PcmToMulawBias);
    1.77 +    exponent = KExpLut[( aPcm >> 7 ) & KAndMask8bit];
    1.78 +    mantissa = ( aPcm >> ( exponent + 3 ) ) & 0x0F;
    1.79 +    ulawbyte = STATIC_CAST( TUint8, ~ ( sign | ( exponent << 4 ) | mantissa ));
    1.80 +
    1.81 +    return ulawbyte;
    1.82 +	}