--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmlibs/mmfw/Codecs/Src/MMFCodecCommon/MMFAudioSPcm16ToALawCodec.cpp	Tue Feb 02 01:56:55 2010 +0200
@@ -0,0 +1,89 @@
+// 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 "MMFAudioSPcm16ToALawCodec.h"
+
+/***
+*
+* Convert
+*
+*/
+EXPORT_C void TMMFAudioSPcm16ToAlawCodec::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples)
+	{
+	TInt16* pcm = (TInt16*)aSrc;
+	TInt16* pcmLimit = pcm + aSamples; 
+
+	while (pcm < pcmLimit)
+		{
+		*aDst++ = PcmSampleToAlaw(*pcm++);
+		}
+
+	}
+
+//[ conversion look up table pcm16 to alaw ]
+const TInt8 TMMFAudioSPcm16ToAlawCodec::KExpLut[] = 
+	{
+	1,1,2,2,3,3,3,3,
+	4,4,4,4,4,4,4,4,
+	5,5,5,5,5,5,5,5,
+	5,5,5,5,5,5,5,5,
+	6,6,6,6,6,6,6,6,
+	6,6,6,6,6,6,6,6,
+	6,6,6,6,6,6,6,6,
+	6,6,6,6,6,6,6,6,
+	7,7,7,7,7,7,7,7,
+	7,7,7,7,7,7,7,7,
+	7,7,7,7,7,7,7,7,
+	7,7,7,7,7,7,7,7,
+	7,7,7,7,7,7,7,7,
+	7,7,7,7,7,7,7,7,
+	7,7,7,7,7,7,7,7,
+	7,7,7,7,7,7,7,7
+	};
+
+/***
+*
+* PcmSampleToAlaw
+* @param aLaw
+* @return TUint8
+*
+*/
+TUint8 TMMFAudioSPcm16ToAlawCodec::PcmSampleToAlaw(TInt aPcm)
+	{
+    TInt sign;
+	TInt exponent;
+	TInt mantissa;
+	TUint8 alawbyte;
+
+    sign = ((~aPcm) >> 8) & KMaskSign8bit;		
+    if (sign == 0)
+		aPcm = -aPcm;	
+    if (aPcm > KMda16PcmToAlawClip) 
+		aPcm = KMda16PcmToAlawClip;
+
+    if (aPcm >= 256)
+		{
+		exponent = KExpLut[( aPcm >> 8 ) & 0x7F];
+		mantissa = ( aPcm >> ( exponent + 3 ) ) & 0x0F;
+		alawbyte = STATIC_CAST( TUint8, (( exponent << 4 ) | mantissa));
+		}
+    else
+		alawbyte = STATIC_CAST( TUint8, aPcm >> 4);
+
+    alawbyte ^= (sign ^ 0x55);
+
+    return alawbyte;
+	}
+