/******************************************************************************\
 * 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(CHANNEL_HOIH9345KJH98_3_4344_BB23945IUHF1912__INCLUDED_)
#define CHANNEL_HOIH9345KJH98_3_4344_BB23945IUHF1912__INCLUDED_

#include <qthread.h>
#include <qdatetime.h>
#include "global.h"
#include "buffer.h"
#include "audiocompr.h"
#include "util.h"
#include "resample.h"
#include "protocol.h"


/* Definitions ****************************************************************/
/* Set the time-out for the input buffer until the state changes from
   connected to not-connected (the actual time depends on the way the error
   correction is implemented) */
#define CON_TIME_OUT_SEC_MAX	5 // seconds
#define CON_TIME_OUT_CNT_MAX	( ( CON_TIME_OUT_SEC_MAX * 1000 ) / BLOCK_DURATION_MS )

/* maximum number of internet connections (channels) */
#define MAX_NUM_CHANNELS		10 /* max number channels for server */

/* no valid channel number */
#define INVALID_CHANNEL_ID		(MAX_NUM_CHANNELS + 1)

enum EPutDataStat
{
	PS_GEN_ERROR,
	PS_AUDIO_OK,
	PS_AUDIO_ERR,
	PS_PROT_OK,
	PS_PROT_ERR
};


/* Classes ********************************************************************/
/* CChannel ----------------------------------------------------------------- */
class CChannel : public QObject
{
	Q_OBJECT

public:
	CChannel();
	virtual ~CChannel() {}

	EPutDataStat PutData ( const CVector<unsigned char>& vecbyData,
						   int iNumBytes );
	bool GetData ( CVector<double>& vecdData );

	CVector<unsigned char> PrepSendPacket ( const CVector<short>& vecsNPacket );

	bool IsConnected() const { return iConTimeOut > 0; }

	int	GetComprAudSize() { return iAudComprSize; }

	void SetAddress ( const CHostAddress NAddr ) { InetAddr = NAddr; }
	bool GetAddress ( CHostAddress& RetAddr );
	CHostAddress GetAddress () { return InetAddr; }

	void SetSockBufSize ( const int iNewBlockSize, const int iNumBlocks );
	int GetSockBufSize() { return SockBuf.GetSize(); }

	// network protocol interface
	void CreateJitBufMes ( const int iJitBufSize )
	{
		Protocol.CreateJitBufMes ( iJitBufSize );
	}

protected:
	/* audio compression */
	CAudioCompression	AudioCompression;
	int					iAudComprSize;

	/* resampling */
	CResample			ResampleObj;
	double				dSamRateOffset;
	CVector<double>		vecdResInData;
	CVector<double>		vecdResOutData;

	/* connection parameters */
	CHostAddress		InetAddr;

	/* network jitter-buffer */
	CNetBuf				SockBuf;

	/* network output conversion buffer */
	CConvBuf			ConvBuf;

	// network protocol
	CProtocol			Protocol;

	/* time stamp index counter */
	Q_UINT8				byTimeStampIdxCnt;
	int					iTimeStampActCnt;

	int					iConTimeOut;

	QMutex Mutex;

public slots:
	void OnSendProtMessage ( CVector<uint8_t> vecMessage );
	void OnJittBufSizeChange ( int iNewJitBufSize );

signals:
	void MessReadyForSending ( CVector<uint8_t> vecMessage );
	void NewConnection();
};


/* CChannelSet (for server) ------------------------------------------------- */
class CChannelSet : public QObject
{
	Q_OBJECT

public:
	CChannelSet();
	virtual ~CChannelSet() {}

	bool PutData ( const CVector<unsigned char>& vecbyRecBuf,
				   const int iNumBytesRead, const CHostAddress& HostAdr );

	int	GetFreeChan();

	int	CheckAddr ( const CHostAddress& Addr );

	void GetBlockAllConC ( CVector<int>& vecChanID,
						   CVector<CVector<double> >& vecvecdData );

	void GetConCliParam( CVector<CHostAddress>& vecHostAddresses,
						 CVector<int>& veciJitBufSize );

	/* access functions for actual channels */
	bool IsConnected ( const int iChanNum )
		{ return vecChannels[iChanNum].IsConnected(); }

	CVector<unsigned char> PrepSendPacket ( const int iChanNum,
											const CVector<short>& vecsNPacket )
		{ return vecChannels[iChanNum].PrepSendPacket ( vecsNPacket ); }

	CHostAddress GetAddress ( const int iChanNum )
		{ return vecChannels[iChanNum].GetAddress(); }

protected:
	/* do not use the vector class since CChannel does not have appropriate
	   copy constructor/operator */
	CChannel	vecChannels[MAX_NUM_CHANNELS];
	QMutex		Mutex;

public slots:
/*
// seems not to work...
	void OnSendProtMessage ( int iChID, CVector<uint8_t> vecMessage );
*/
// make sure we have MAX_NUM_CHANNELS connections!!!
void OnSendProtMessCh0(CVector<uint8_t> mess) {emit MessReadyForSending(0,mess);}
void OnSendProtMessCh1(CVector<uint8_t> mess) {emit MessReadyForSending(1,mess);}
void OnSendProtMessCh2(CVector<uint8_t> mess) {emit MessReadyForSending(2,mess);}
void OnSendProtMessCh3(CVector<uint8_t> mess) {emit MessReadyForSending(3,mess);}
void OnSendProtMessCh4(CVector<uint8_t> mess) {emit MessReadyForSending(4,mess);}
void OnSendProtMessCh5(CVector<uint8_t> mess) {emit MessReadyForSending(5,mess);}
void OnSendProtMessCh6(CVector<uint8_t> mess) {emit MessReadyForSending(6,mess);}
void OnSendProtMessCh7(CVector<uint8_t> mess) {emit MessReadyForSending(7,mess);}
void OnSendProtMessCh8(CVector<uint8_t> mess) {emit MessReadyForSending(8,mess);}
void OnSendProtMessCh9(CVector<uint8_t> mess) {emit MessReadyForSending(9,mess);}

signals:
	void MessReadyForSending ( int iChID, CVector<uint8_t> vecMessage );
};


/* Sample rate offset estimation -------------------------------------------- */
class CSampleOffsetEst
{
public:
	CSampleOffsetEst() { Init(); }
	virtual ~CSampleOffsetEst() {}

	void Init();
	void AddTimeStampIdx ( const int iTimeStampIdx );
	double GetSamRate() { return dSamRateEst; }

protected:
	QTime				RefTime;
	int					iAccTiStVal;
	double				dSamRateEst;
	CVector<long int>	veciTimeElapsed;
	CVector<long int>	veciTiStIdx;
	int					iInitCnt;
};


#endif /* !defined(CHANNEL_HOIH9345KJH98_3_4344_BB23945IUHF1912__INCLUDED_) */