1 /*

     2 * Copyright (c) 2002-2003 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 */

    17 

    18 #ifndef __MMF_TMMFAUDIO_CODEC_BASE_H__

    19 #define __MMF_TMMFAUDIO_CODEC_BASE_H__

    20 #include <e32std.h>

    21 #include <mmfcodec/mmfaudiodatasettings.h>

    22 

    23 const TInt KClamp = 32768;

    24 const TInt KMaskSign16bit = 0x8000;

    25 const TInt KMaskSign8bit = 0x80;

    26 const TInt KAndMask8bit = 0xff;

    27 const TInt KMaxImaAdpcmTableEntries = 88;

    28 

    29 const TUint KImaAdpcmBlockAlign = 256;

    30 //samples per block = [((block align - (4 * nChannels)) * 8) / (bits per sample * nChannels)] + 1

    31 const TUint KImaAdpcmSamplesPerBlock = ((KImaAdpcmBlockAlign - 4)*2) + 1;	//505

    32 const TUint KImaAdpcmStereoSamplesPerBlock = (KImaAdpcmBlockAlign - 8) + 1; //249

    33 const TUint KImaAdpcmTempBufferSize = KImaAdpcmSamplesPerBlock*2;

    34 const TUint KImaAdpcmStereoTempBufferSize = KImaAdpcmStereoSamplesPerBlock*4;

    35 

    36 //Gsm coded Frame size

    37 const TInt KCodedBufferSize = 152;

    38 

    39 // Base of Audio codecs

    40 /*

    41 *

    42 * class TMMFAudioCodecBase

    43 *

    44 */

    45 class TMMFAudioCodecBase

    46 	{

    47 public:

    48 	inline TMMFAudioCodecBase();

    49 	//

    50 	virtual void Convert(TUint8* aSrc, TUint8* aDst, TInt aSamples)=0;

    51 	};

    52 

    53 inline TMMFAudioCodecBase::TMMFAudioCodecBase()

    54 	{}

    55 

    56 #endif //__MMF_TMMFAUDIO_CODEC_BASE_H__