jamulus/src/socket.cpp

/******************************************************************************\
 * 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
 *
\******************************************************************************/

#include "socket.h"


/* Implementation *************************************************************/
void CSocket::Init()
{
	/* allocate memory for network receive and send buffer in samples */
	vecbyRecBuf.Init(MAX_SIZE_BYTES_NETW_BUF);

	/* initialize the listening socket */
	bool bSuccess = SocketDevice.bind(
		QHostAddress((Q_UINT32) 0) /* INADDR_ANY */, LLCON_PORT_NUMBER);

	if (bIsClient)
	{
		/* if no success, try if server is on same machine (only for client) */
		if (!bSuccess)
		{
			/* if server and client is on same machine, decrease port number by
			one by definition */
			bSuccess =
				SocketDevice.bind(QHostAddress((Q_UINT32) 0) /* INADDR_ANY */,
				LLCON_PORT_NUMBER - 1);
		}
	}

	if (!bSuccess)
	{
		/* show error message */
		QMessageBox::critical(0, "Network Error", "Cannot bind the socket.",
			QMessageBox::Ok, QMessageBox::NoButton);

		/* exit application */
		exit(1);
	}

	QSocketNotifier* pSocketNotivRead =
		new QSocketNotifier(SocketDevice.socket(), QSocketNotifier::Read);

	/* connect the "activated" signal */
	QObject::connect(pSocketNotivRead, SIGNAL(activated(int)),
		this, SLOT(OnDataReceived()));
}

void CSocket::SendPacket(const CVector<unsigned char>& vecbySendBuf,
						 const CHostAddress& HostAddr, const int iTimeStampIdx)
{
	const int iVecSizeOut = vecbySendBuf.Size();

	if ( iVecSizeOut != 0 )
	{
		/* send packet through network */
		SocketDevice.writeBlock ((const char*) &((CVector<unsigned char>) vecbySendBuf)[0],
			iVecSizeOut, HostAddr.InetAddr, HostAddr.iPort);
	}

	/* sent time stamp if required */
	if (iTimeStampIdx != INVALID_TIME_STAMP_IDX)
	{
		/* Always one byte long */
		SocketDevice.writeBlock((const char*) &iTimeStampIdx, 1,
			HostAddr.InetAddr, HostAddr.iPort);
	}
}

void CSocket::OnDataReceived()
{
	/* read block from network interface */
	const int iNumBytesRead = SocketDevice.readBlock((char*) &vecbyRecBuf[0],
		MAX_SIZE_BYTES_NETW_BUF);

	/* check if an error occurred */
	if (iNumBytesRead < 0)
		return;

	/* get host address of client */
	CHostAddress RecHostAddr(SocketDevice.peerAddress(),
		SocketDevice.peerPort());

	if (bIsClient)
	{
		/* client */
		/* check if packet comes from the server we want to connect */
		if (!(pChannel->GetAddress() == RecHostAddr))
			return;

		if (pChannel->PutData(vecbyRecBuf, iNumBytesRead))
			PostWinMessage(MS_JIT_BUF_PUT, MUL_COL_LED_GREEN);
		else
			PostWinMessage(MS_JIT_BUF_PUT, MUL_COL_LED_RED);
	}
	else
	{
		/* server */
		pChannelSet->PutData(vecbyRecBuf, iNumBytesRead, RecHostAddr);
	}
}