158 lines
4.3 KiB
C++
Executable File
158 lines
4.3 KiB
C++
Executable File
/******************************************************************************\
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* Copyright (c) 2004-2006
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*
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* Author(s):
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* Volker Fischer
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*
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******************************************************************************
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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\******************************************************************************/
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#include "server.h"
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/* Implementation *************************************************************/
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CServer::CServer () : Socket ( &ChannelSet )
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{
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vecsSendData.Init ( MIN_BLOCK_SIZE_SAMPLES );
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/* init moving average buffer for response time evaluation */
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RespTimeMoAvBuf.Init ( LEN_MOV_AV_RESPONSE );
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/* connect timer timeout signal */
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QObject::connect ( &Timer, SIGNAL ( timeout () ),
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this, SLOT ( OnTimer () ) );
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}
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void CServer::Start ()
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{
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if ( !IsRunning () )
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{
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/* start main timer */
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Timer.start ( MIN_BLOCK_DURATION_MS );
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/* init time for response time evaluation */
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TimeLastBlock = QTime::currentTime ();
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}
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}
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void CServer::Stop ()
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{
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/* stop main timer */
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Timer.stop ();
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}
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void CServer::OnTimer ()
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{
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CVector<int> vecChanID;
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CVector<CVector<double> > vecvecdData ( MIN_BLOCK_SIZE_SAMPLES );
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/* get data from all connected clients */
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ChannelSet.GetBlockAllConC ( vecChanID, vecvecdData );
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const int iNumClients = vecvecdData.Size ();
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/* Check if at least one client is connected. If not, stop server until
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one client is connected */
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if ( iNumClients != 0 )
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{
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/* actual processing of audio data -> mix */
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vecsSendData = ProcessData ( vecvecdData );
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/* send the same data to all connected clients */
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for ( int i = 0; i < iNumClients; i++ )
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{
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Socket.SendPacket (
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ChannelSet.PrepSendPacket ( vecChanID[i], vecsSendData ),
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ChannelSet.GetAddress ( vecChanID[i] ),
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ChannelSet.GetTimeStampIdx ( vecChanID[i] ) );
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}
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/* update response time measurement --------------------------------- */
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/* add time difference */
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const QTime CurTime = QTime::currentTime ();
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/* we want to calculate the standard deviation (we assume that the mean
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is correct at the block period time) */
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const double dCurAddVal = ( (double) TimeLastBlock.msecsTo ( CurTime ) -
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MIN_BLOCK_DURATION_MS );
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RespTimeMoAvBuf.Add ( dCurAddVal * dCurAddVal ); /* add squared value */
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/* store old time value */
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TimeLastBlock = CurTime;
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}
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else
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{
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/* disable server */
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// TODO not yet working since the socket does not have access to the server
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// object and cannot restart the server if packets arrive...
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// Stop ();
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}
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}
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CVector<short> CServer::ProcessData ( CVector<CVector<double> >& vecvecdData )
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{
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CVector<short> vecsOutData;
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vecsOutData.Init ( MIN_BLOCK_SIZE_SAMPLES );
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const int iNumClients = vecvecdData.Size ();
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/* we normalize with sqrt() of N to avoid that the level drops too much
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in case that a new client connects */
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const double dNorm = sqrt ( (double) iNumClients );
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/* mix all audio data from all clients together */
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for ( int i = 0; i < MIN_BLOCK_SIZE_SAMPLES; i++ )
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{
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double dMixedData = 0.0;
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for ( int j = 0; j < iNumClients; j++ )
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{
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dMixedData += vecvecdData[j][i];
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}
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/* normalization and truncating to short */
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vecsOutData[i] = Double2Short ( dMixedData / dNorm );
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}
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return vecsOutData;
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}
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bool CServer::GetTimingStdDev ( double& dCurTiStdDev )
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{
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dCurTiStdDev = 0.0; /* init return value */
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/* only return value if server is active and the actual measurement is
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updated */
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if ( IsRunning () )
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{
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/* we want to return the standard deviation, for that we need to calculate
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the sqaure root */
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dCurTiStdDev = sqrt ( RespTimeMoAvBuf.GetAverage () );
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return true;
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}
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else
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{
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return false;
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}
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}
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