/******************************************************************************\
 * Copyright (c) 2004-2006
 *
 * Author(s):
 *	Volker Fischer
 *
 ******************************************************************************
 *
 * 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(BUFFER_H__3B123453_4344_BB23945IUHF1912__INCLUDED_)
#define BUFFER_H__3B123453_4344_BB23945IUHF1912__INCLUDED_

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


/* Definitions ****************************************************************/
/* time for fading effect for masking drop outs */
#define FADE_IN_OUT_TIME			((double) 0.3) /* ms */
#define FADE_IN_OUT_NUM_SAM			((int) (SAMPLE_RATE * FADE_IN_OUT_TIME) / 1000)

/* for extrapolation a shorter time for fading */
#define FADE_IN_OUT_NUM_SAM_EXTRA	5 /* samples */


/* Classes ********************************************************************/
class CNetBuf
{
public:
	CNetBuf() {}
	virtual ~CNetBuf() {}

	void Init(const int iNewBlockSize, const int iNewNumBlocks);
	int GetSize() {return iMemSize / iBlockSize;}

	bool Put(CVector<double>& vecdData);
	bool Get(CVector<double>& vecdData);

protected:
	enum EBufState {BS_OK, BS_FULL, BS_EMPTY};
	enum EClearType {CT_PUT, CT_GET};
	void Clear(const EClearType eClearType);
	int GetAvailSpace() const;
	int GetAvailData() const;
	void FadeInAudioDataBlock(CVector<double>& vecdData);
	void FadeOutExtrapolateAudioDataBlock(CVector<double>& vecdData,
		const double dExPDiff, const double dExPLastV);

	CVector<double>	vecdMemory;
	int				iMemSize;
	int				iBlockSize;
	int				iGetPos, iPutPos;
	EBufState		eBufState;
	bool			bFadeInNewPutData;
	int				iNumSamFading;
	int				iNumSamFadingExtra;

	/* extrapolation parameters */
	double			dExPDiff;
	double			dExPLastV;
};


/* conversion buffer (very simple buffer) */
class CConvBuf
{
public:
	CConvBuf () {}
	virtual ~CConvBuf () {}

	void Init ( const int iNewMemSize );
	int GetSize() { return iMemSize; }

	bool Put ( const CVector<short>& vecsData );
	CVector<short> Get ();

protected:
	CVector<short>	vecsMemory;
	int				iMemSize;
	int				iBlockSize;
	int				iPutPos;
};


#endif /* !defined(BUFFER_H__3B123453_4344_BB23945IUHF1912__INCLUDED_) */