jamulus/src/client.cpp

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/******************************************************************************\
* Copyright (c) 2004-2009
*
* 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 "client.h"
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/* Implementation *************************************************************/
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CClient::CClient ( const quint16 iPortNumber ) :
Channel ( false ), /* we need a client channel -> "false" */
Sound ( AudioCallback, this ),
Socket ( &Channel, iPortNumber ),
iAudioInFader ( AUD_FADER_IN_MIDDLE ),
iReverbLevel ( 0 ),
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bReverbOnLeftChan ( false ),
strIPAddress ( "" ), strName ( "" ),
bOpenChatOnNewMessage ( true ),
bDoAutoSockBufSize ( true ),
iSndCrdPreferredMonoBlSizeIndex ( CSndCrdBufferSizes::GetDefaultIndex() ),
iSndCrdMonoBlockSizeSam ( 0 )
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{
// connection for protocol
QObject::connect ( &Channel,
SIGNAL ( MessReadyForSending ( CVector<uint8_t> ) ),
this, SLOT ( OnSendProtMessage ( CVector<uint8_t> ) ) );
QObject::connect ( &Channel, SIGNAL ( ReqJittBufSize() ),
this, SLOT ( OnReqJittBufSize() ) );
QObject::connect ( &Channel,
SIGNAL ( ConClientListMesReceived ( CVector<CChannelShortInfo> ) ),
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SIGNAL ( ConClientListMesReceived ( CVector<CChannelShortInfo> ) ) );
QObject::connect ( &Channel, SIGNAL ( NewConnection() ),
this, SLOT ( OnNewConnection() ) );
QObject::connect ( &Channel, SIGNAL ( ChatTextReceived ( QString ) ),
this, SIGNAL ( ChatTextReceived ( QString ) ) );
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QObject::connect ( &Channel, SIGNAL ( PingReceived ( int ) ),
this, SLOT ( OnReceivePingMessage ( int ) ) );
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}
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void CClient::OnSendProtMessage ( CVector<uint8_t> vecMessage )
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{
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// convert unsigned uint8_t in char, TODO convert all buffers in uint8_t
CVector<unsigned char> vecbyDataConv ( vecMessage.Size() );
for ( int i = 0; i < vecMessage.Size(); i++ ) {
vecbyDataConv[i] = static_cast<unsigned char> ( vecMessage[i] );
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}
// the protocol queries me to call the function to send the message
// send it through the network
Socket.SendPacket ( vecbyDataConv, Channel.GetAddress() );
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}
void CClient::OnReqJittBufSize()
{
// TODO cant we implement this OnReqJjittBufSize inside the channel object?
Channel.CreateJitBufMes ( Channel.GetSockBufSize() );
}
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void CClient::OnNewConnection()
{
// a new connection was successfully initiated, send name and request
// connected clients list
Channel.SetRemoteName ( strName );
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// We have to send a connected clients list request since it can happen
// that we just had connected to the server and then disconnected but
// the server still thinks that we are connected (the server is still
// waiting for the channel time-out). If we now connect again, we would
// not get the list because the server does not know about a new connection.
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Channel.CreateReqConnClientsList();
}
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void CClient::OnReceivePingMessage ( int iMs )
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{
// calculate difference between received time in ms and current time in ms,
// take care of wrap arounds (if wrapping, do not use result)
const int iCurDiff = PreciseTime.elapsed() - iMs;
if ( iCurDiff >= 0 )
{
emit PingTimeReceived ( iCurDiff );
}
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}
bool CClient::SetServerAddr ( QString strNAddr )
{
QHostAddress InetAddr;
quint16 iNetPort = LLCON_DFAULT_PORT_NUMBER;
// parse input address for the type [IP address]:[port number]
QString strPort = strNAddr.section ( ":", 1, 1 );
if ( !strPort.isEmpty() )
{
// a colon is present in the address string, try to extract port number
iNetPort = strPort.toInt();
// extract address port before colon (should be actual internet address)
strNAddr = strNAddr.section ( ":", 0, 0 );
}
// first try if this is an IP number an can directly applied to QHostAddress
if ( !InetAddr.setAddress ( strNAddr ) )
{
// it was no vaild IP address, try to get host by name, assuming
// that the string contains a valid host name string
QHostInfo HostInfo = QHostInfo::fromName ( strNAddr );
if ( HostInfo.error() == QHostInfo::NoError )
{
// apply IP address to QT object
if ( !HostInfo.addresses().isEmpty() )
{
// use the first IP address
InetAddr = HostInfo.addresses().first();
}
}
else
{
return false; // invalid address
}
}
// apply address (the server port is fixed and always the same)
Channel.SetAddress ( CHostAddress ( InetAddr, iNetPort ) );
return true;
}
void CClient::SetSndCrdPreferredMonoBlSizeIndex ( const int iNewIdx )
{
// right now we simply set the internal value
if ( ( iNewIdx >= 0 ) && ( CSndCrdBufferSizes::GetNumOfBufferSizes() ) )
{
iSndCrdPreferredMonoBlSizeIndex = iNewIdx;
}
// init with new parameter, if client was running then first
// stop it and restart again after new initialization
const bool bWasRunning = Sound.IsRunning();
if ( bWasRunning )
{
Sound.Stop();
}
// init with new block size index parameter
Init ( iSndCrdPreferredMonoBlSizeIndex );
if ( bWasRunning )
{
Sound.Start();
}
// tell the server that audio coding has changed (it
// is important to call this function AFTER we have applied
// the new setting to the channel!)
Channel.CreateNetTranspPropsMessFromCurrentSettings();
}
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void CClient::SetSndCrdDev ( const int iNewDev )
{
// if client was running then first
// stop it and restart again after new initialization
const bool bWasRunning = Sound.IsRunning();
if ( bWasRunning )
{
Sound.Stop();
}
Sound.SetDev ( iNewDev );
// init again because the sound card actual buffer size might
// be changed on new device
Init ( iSndCrdPreferredMonoBlSizeIndex );
if ( bWasRunning )
{
Sound.Start();
}
}
void CClient::Start()
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{
// init object
Init ( iSndCrdPreferredMonoBlSizeIndex );
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// enable channel
Channel.SetEnable ( true );
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// start audio interface
Sound.Start();
}
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void CClient::Stop()
{
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// stop audio interface
Sound.Stop();
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// disable channel
Channel.SetEnable ( false );
// reset current signal level and LEDs
SignalLevelMeter.Reset();
PostWinMessage ( MS_RESET_ALL, 0 );
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}
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void CClient::AudioCallback ( CVector<short>& psData, void* arg )
{
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// get the pointer to the object
CClient* pMyClientObj = reinterpret_cast<CClient*> ( arg );
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// process audio data
pMyClientObj->ProcessAudioData ( psData );
}
void CClient::Init ( const int iPrefMonoBlockSizeSamIndexAtSndCrdSamRate )
{
// translate block size index in actual block size
const int iPrefMonoBlockSizeSamAtSndCrdSamRate = CSndCrdBufferSizes::
GetBufferSizeFromIndex ( iPrefMonoBlockSizeSamIndexAtSndCrdSamRate );
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// get actual sound card buffer size using preferred size
iSndCrdMonoBlockSizeSam = Sound.Init ( iPrefMonoBlockSizeSamAtSndCrdSamRate );
iSndCrdStereoBlockSizeSam = 2 * iSndCrdMonoBlockSizeSam;
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iMonoBlockSizeSam = iSndCrdMonoBlockSizeSam * SYSTEM_SAMPLE_RATE / SND_CRD_SAMPLE_RATE;
iStereoBlockSizeSam = 2 * iMonoBlockSizeSam;
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// the channel works on the same block size as the sound interface
Channel.SetNetwBufSizeOut ( iMonoBlockSizeSam );
vecsAudioSndCrdStereo.Init ( iSndCrdStereoBlockSizeSam );
vecdAudioSndCrdMono.Init ( iSndCrdMonoBlockSizeSam );
vecdAudioSndCrdStereo.Init ( iSndCrdStereoBlockSizeSam );
vecdAudioStereo.Init ( iStereoBlockSizeSam );
// resample objects are always initialized with the input block size
// record
ResampleObjDown.Init ( iSndCrdMonoBlockSizeSam, SND_CRD_SAMPLE_RATE, SYSTEM_SAMPLE_RATE );
// playback
ResampleObjUp.Init ( iMonoBlockSizeSam, SYSTEM_SAMPLE_RATE, SND_CRD_SAMPLE_RATE );
// init network buffers
vecsNetwork.Init ( iMonoBlockSizeSam );
vecdNetwData.Init ( iMonoBlockSizeSam );
// init response time evaluation
CycleTimeVariance.Init ( LEN_MOV_AV_RESPONSE );
CycleTimeVariance.Reset();
AudioReverb.Clear();
}
void CClient::ProcessAudioData ( CVector<short>& vecsStereoSndCrd )
{
int i, j;
// convert data from short to double
for ( i = 0; i < iSndCrdStereoBlockSizeSam; i++ )
{
vecdAudioSndCrdStereo[i] = (double) vecsStereoSndCrd[i];
}
// resample data for each channel seaparately
ResampleObjDown.ResampleStereo ( vecdAudioSndCrdStereo, vecdAudioStereo );
// update stereo signal level meter
SignalLevelMeter.Update ( vecdAudioStereo );
// add reverberation effect if activated
if ( iReverbLevel != 0 )
{
// calculate attenuation amplification factor
const double dRevLev = (double) iReverbLevel / AUD_REVERB_MAX / 2;
if ( bReverbOnLeftChan )
{
for ( i = 0; i < iStereoBlockSizeSam; i += 2 )
{
// left channel
vecdAudioStereo[i] +=
dRevLev * AudioReverb.ProcessSample ( vecdAudioStereo[i] );
}
}
else
{
for ( i = 1; i < iStereoBlockSizeSam; i += 2 )
{
// right channel
vecdAudioStereo[i] +=
dRevLev * AudioReverb.ProcessSample ( vecdAudioStereo[i] );
}
}
}
// mix both signals depending on the fading setting, convert
// from double to short
if ( iAudioInFader == AUD_FADER_IN_MIDDLE )
{
// just mix channels together
for ( i = 0, j = 0; i < iMonoBlockSizeSam; i++, j += 2 )
{
vecsNetwork[i] =
Double2Short ( vecdAudioStereo[j] + vecdAudioStereo[j + 1] );
}
}
else
{
const double dAttFact =
(double) ( AUD_FADER_IN_MIDDLE - abs ( AUD_FADER_IN_MIDDLE - iAudioInFader ) ) /
AUD_FADER_IN_MIDDLE;
if ( iAudioInFader > AUD_FADER_IN_MIDDLE )
{
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for ( i = 0, j = 0; i < iMonoBlockSizeSam; i++, j += 2 )
{
// attenuation on right channel
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vecsNetwork[i] =
Double2Short ( vecdAudioStereo[j] + dAttFact * vecdAudioStereo[j + 1] );
}
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}
else
{
for ( i = 0, j = 0; i < iMonoBlockSizeSam; i++, j += 2 )
{
// attenuation on left channel
vecsNetwork[i] =
Double2Short ( vecdAudioStereo[j + 1] + dAttFact * vecdAudioStereo[j] );
}
}
}
// send it through the network
Socket.SendPacket ( Channel.PrepSendPacket ( vecsNetwork ),
Channel.GetAddress() );
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// receive a new block
if ( Channel.GetData ( vecdNetwData ) == GS_BUFFER_OK )
{
PostWinMessage ( MS_JIT_BUF_GET, MUL_COL_LED_GREEN );
}
else
{
PostWinMessage ( MS_JIT_BUF_GET, MUL_COL_LED_RED );
}
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/*
// TEST
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// fid=fopen('v.dat','r');x=fread(fid,'int16');fclose(fid);
static FILE* pFileDelay = fopen("v.dat", "wb");
short sData[2];
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for (i = 0; i < iMonoBlockSizeSam; i++)
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{
sData[0] = (short) vecdNetwData[i];
fwrite(&sData, size_t(2), size_t(1), pFileDelay);
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}
fflush(pFileDelay);
*/
// check if channel is connected
if ( Channel.IsConnected() )
{
// resample data
ResampleObjUp.ResampleMono ( vecdNetwData, vecdAudioSndCrdMono );
// convert data from double to short type and copy mono
// received data in both sound card channels
for ( i = 0, j = 0; i < iSndCrdMonoBlockSizeSam; i++, j += 2 )
{
vecsStereoSndCrd[j] = vecsStereoSndCrd[j + 1] =
Double2Short ( vecdAudioSndCrdMono[i] );
}
}
else
{
// if not connected, clear data
vecsStereoSndCrd.Reset ( 0 );
}
// update response time measurement and socket buffer size
CycleTimeVariance.Update();
UpdateSocketBufferSize();
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}
void CClient::UpdateSocketBufferSize()
{
// just update the socket buffer size if auto setting is enabled, otherwise
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// do nothing
if ( bDoAutoSockBufSize )
{
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// We use the time response measurement for the automatic setting.
// Assumptions:
// - the network jitter can be neglected compared to the audio
// interface jitter
// - the audio interface jitter is assumed to be Gaussian
// - the buffer size is set to two times the standard deviation of
// the audio interface jitter (~95% of the jitter should be fit in the
// buffer)
// - introduce a hysteresis to avoid switching the buffer sizes all the
// time in case the time response measurement is close to a bound
// - only use time response measurement results if averaging buffer is
// completely filled
const double dHysteresis = 0.3;
if ( CycleTimeVariance.IsInitialized() )
{
// calculate current buffer setting
// TODO 2* seems not give optimal results, maybe use 3*?
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// add .5 to "round up" -> ceil
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// divide by MIN_SERVER_BLOCK_DURATION_MS because this is the size of
// one block in the jitter buffer
// TODO use max(audioMs, receivedNetpacketsMs)
const double dAudioBufferDurationMs =
iMonoBlockSizeSam / SYSTEM_SAMPLE_RATE * 1000;
const double dEstCurBufSet = ( dAudioBufferDurationMs +
3 * ( CycleTimeVariance.GetStdDev() + 0.5 ) ) /
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MIN_SERVER_BLOCK_DURATION_MS;
// upper/lower hysteresis decision
const int iUpperHystDec = LlconMath().round ( dEstCurBufSet - dHysteresis );
const int iLowerHystDec = LlconMath().round ( dEstCurBufSet + dHysteresis );
// if both decisions are equal than use the result
if ( iUpperHystDec == iLowerHystDec )
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{
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// set the socket buffer via the main window thread since somehow
// it gives a protocol deadlock if we call the SetSocketBufSize()
// function directly
PostWinMessage ( MS_SET_JIT_BUF_SIZE, iUpperHystDec );
}
else
{
// we are in the middle of the decision region, use
// previous setting for determing the new decision
if ( !( ( GetSockBufSize() == iUpperHystDec ) ||
( GetSockBufSize() == iLowerHystDec ) ) )
{
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// The old result is not near the new decision,
// use per definition the upper decision.
// Set the socket buffer via the main window thread since somehow
// it gives a protocol deadlock if we call the SetSocketBufSize()
// function directly.
PostWinMessage ( MS_SET_JIT_BUF_SIZE, iUpperHystDec );
}
}
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}
}
}