--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmlibs/mmfw/Codecs/Src/MMFCodecCommon/MMFAudioImaAdpcmToS16Codec.cpp	Tue Feb 02 01:56:55 2010 +0200
@@ -0,0 +1,121 @@
+// 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:
+// MMFAudioImaAdpcmToS16PcmCodec.cpp
+// 
+//
+
+#include "MMFAudioImaAdpcmToS16PcmCodec.h"
+
+/**
+*
+* Convert
+* @param aSrc
+* @param aDst
+* @param aSamples
+*
+*/
+EXPORT_C void TMMFAudioImaAdpcmToS16PcmCodec::Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples)
+	{
+	TInt delta;			// Current adpcm output value 
+    TInt step;			// Stepsize
+    TInt valpred;		// Predicted value 
+    TInt vpdiff;		// Current change to valpred 
+    TInt index;			// Current step change index 
+
+	//[Read first sample and index from block header
+	// we do not need to store the information across calls 
+	//since we process the entire block here]
+	valpred = (*aSrc++) & KAndMask8bit;
+	valpred |= STATIC_CAST(TInt16, ((*aSrc++) << 8));
+	index = *aSrc++;
+	TUint8* dst=aDst;
+
+	aSrc++; //skip reserved header byte
+
+	//Write first sample to dest
+	*aDst++ = STATIC_CAST( TUint8, valpred);
+	*aDst++ = STATIC_CAST( TUint8, valpred >> 8);
+	dst += 2;
+	aSamples --;
+
+	TBool theBufferStep = ETrue;
+    TInt  bufferValue = 0;
+	for ( ; aSamples > 0 ; aSamples-- ) 
+		{ 
+		// Step 1 - get the delta value
+		if ( theBufferStep) 
+			{
+			bufferValue = *aSrc++;
+			delta = bufferValue & 0xf;
+			} 
+		else 
+			{
+			delta = (bufferValue >> 4) & 0xf;
+			}
+
+		theBufferStep = !theBufferStep;
+
+		ASSERT(index >= 0);
+		step = KStepSizeTable[index];
+
+		vpdiff = step>>3;
+		if ( delta & 4 ) 
+			vpdiff += step;
+		if ( delta & 2 ) 
+			vpdiff += step>>1;
+		if ( delta & 1 ) 
+			vpdiff += step>>2;
+
+		if ( delta & 8 )
+			valpred -= vpdiff;
+		else
+			valpred += vpdiff;
+
+		if ( valpred > (KClamp - 1) )
+			valpred = (KClamp - 1);
+		else if ( valpred < -KClamp )
+			valpred = -KClamp;
+
+		index += KIndexTable[delta];
+		if ( index < 0 ) 
+			index = 0;
+		if ( index > KMaxImaAdpcmTableEntries ) 
+			index = KMaxImaAdpcmTableEntries;
+
+		*dst++ = STATIC_CAST( TUint8, valpred&KAndMask8bit);
+		*dst++ = STATIC_CAST( TUint8, (valpred>>8) );
+		}
+	}
+
+
+
+// IMA-ADPCM step variation table 
+const TInt TMMFAudioImaAdpcmToS16PcmCodec::KIndexTable[] =
+ 	{
+    -1, -1, -1, -1, 2, 4, 6, 8,
+    -1, -1, -1, -1, 2, 4, 6, 8
+	};
+
+const TInt TMMFAudioImaAdpcmToS16PcmCodec::KStepSizeTable[89] = 
+	{
+   7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
+   19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
+   50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
+   130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
+   337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
+   876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
+   2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
+   5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
+   15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
+	};