/******************************************************************************\
 * Copyright (c) 2004-2006
 *
 * Author(s):
 *	Volker Fischer, Erik de Castro Lopo
 *
 ******************************************************************************
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later 
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
\******************************************************************************/

#if !defined(AUDIOCOMPR_H_OIHGE76GEKJH3249_GEG98EG3_43441912__INCLUDED_)
#define AUDIOCOMPR_H_OIHGE76GEKJH3249_GEG98EG3_43441912__INCLUDED_

#include "util.h"
#include "global.h"
#include "buffer.h"


/* Definitions ****************************************************************/
/* tables */
static int ima_indx_adjust[16] =
{	-1, -1, -1, -1,		/* +0 - +3, decrease the step size */
     2,  4,  6,  8,     /* +4 - +7, increase the step size */
    -1, -1, -1, -1,		/* -0 - -3, decrease the step size */
     2,  4,  6,  8,		/* -4 - -7, increase the step size */
};

#define IMA_STEP_SIZE_TAB_LEN			89
static int ima_step_size[IMA_STEP_SIZE_TAB_LEN] =
{	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
};


/* Classes ********************************************************************/
/* IMA-ADPCM ---------------------------------------------------------------- */
class CImaAdpcm
{
public:
	CImaAdpcm() : iStepindEnc ( 0 ) {}
	virtual ~CImaAdpcm() {}

	int						Init ( const int iNewAudioLen );
	CVector<unsigned char>	Encode ( const CVector<short>& vecsAudio );
	CVector<short>			Decode ( const CVector<unsigned char>& vecbyAdpcm );

protected:
	int iAudSize;
	int iAdpcmSize;
	int iStepindEnc;

	/* inline functions must be declared in the header */
	inline int CheckBounds ( const int iData, const int iMin, const int iMax )
	{
		if ( iData > iMax )
		{
			return iMax;
		}

		if ( iData < iMin )
		{
			return iMin;
		}

		return iData;
	}
};


/* Audio compression class -------------------------------------------------- */
class CAudioCompression
{
public:
	enum EAudComprType { CT_NONE, CT_IMAADPCM };

	CAudioCompression() {}
	virtual ~CAudioCompression() {}

	int						Init ( const int iNewAudioLen,
								   const EAudComprType eNewAuCoTy );
	CVector<unsigned char>	Encode ( const CVector<short>& vecsAudio );
	CVector<short>			Decode ( const CVector<unsigned char>& vecbyAdpcm );

protected:
	EAudComprType	eAudComprType;
	CImaAdpcm		ImaAdpcm;
	int				iCodeSize;
};


#endif /* !defined(AUDIOCOMPR_H_OIHGE76GEKJH3249_GEG98EG3_43441912__INCLUDED_) */