jamulus/src/socket.cpp

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/******************************************************************************\
* Copyright (c) 2004-2008
*
* 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 ( const quint16 iPortNumber )
{
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// allocate memory for network receive and send buffer in samples
vecbyRecBuf.Init ( MAX_SIZE_BYTES_NETW_BUF );
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// initialize the listening socket
bool bSuccess = SocketDevice.bind (
QHostAddress ( QHostAddress::Any ), iPortNumber );
// if no success, try if server is on same machine (only for client)
if ( ( !bSuccess ) && bIsClient )
{
// if server and client is on same machine, decrease port number by
// one by definition
bSuccess = SocketDevice.bind (
QHostAddress( QHostAddress::Any ), iPortNumber - 1 );
}
if ( !bSuccess )
{
// we cannot bind socket, throw error
throw CGenErr ( "Cannot bind the socket (maybe "
"the software is already running).", "Network Error" );
}
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// connect the "activated" signal
QObject::connect ( &SocketDevice, SIGNAL ( readyRead() ),
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this, SLOT ( OnDataReceived() ) );
}
void CSocket::SendPacket ( const CVector<unsigned char>& vecbySendBuf,
const CHostAddress& HostAddr )
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{
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const int iVecSizeOut = vecbySendBuf.Size();
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if ( iVecSizeOut != 0 )
{
// send packet through network (we have to convert the constant unsigned
// char vector in "const char*", for this we first convert the const
// unsigned char vector in a read/write unsigned char vector and then
// do the cast to const char*)
SocketDevice.writeDatagram (
(const char*) &( (CVector<unsigned char>) vecbySendBuf )[0],
iVecSizeOut, HostAddr.InetAddr, HostAddr.iPort );
}
}
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void CSocket::OnDataReceived()
{
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while ( SocketDevice.hasPendingDatagrams() )
{
QHostAddress SenderAddress;
quint16 SenderPort;
// read block from network interface and query address of sender
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int iNumBytesRead = SocketDevice.readDatagram ( (char*) &vecbyRecBuf[0],
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MAX_SIZE_BYTES_NETW_BUF, &SenderAddress, &SenderPort );
// check if an error occurred
if ( iNumBytesRead < 0 )
{
return;
}
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// convert address of client
const CHostAddress RecHostAddr ( SenderAddress, SenderPort );
if ( bIsClient )
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{
// client
// check if packet comes from the server we want to connect
if ( ! ( pChannel->GetAddress() == RecHostAddr ) )
{
return;
}
switch ( pChannel->PutData ( vecbyRecBuf, iNumBytesRead ) )
{
case PS_AUDIO_OK:
PostWinMessage ( MS_JIT_BUF_PUT, MUL_COL_LED_GREEN );
break;
case PS_AUDIO_ERR:
case PS_GEN_ERROR:
PostWinMessage ( MS_JIT_BUF_PUT, MUL_COL_LED_RED );
break;
case PS_PROT_ERR:
PostWinMessage ( MS_JIT_BUF_PUT, MUL_COL_LED_YELLOW );
break;
}
}
else
{
// server
if ( pChannelSet->PutData ( vecbyRecBuf, iNumBytesRead, RecHostAddr ) )
{
// this was an audio packet, start server
// tell the server object to wake up if it
// is in sleep mode (Qt will delete the event object when done)
QCoreApplication::postEvent ( pServer,
new CLlconEvent ( MS_PACKET_RECEIVED, 0, 0 ) );
}
}
}
}