preliminary implementation

src/channel.h

@@ -110,8 +110,10 @@ public:
     void SetSockBufSize ( const int iNumBlocks );
     int GetSockBufSize() { return iCurSockBufSize; }
 
-// TEST
     void SetNetwBufSizeOut ( const int iNewAudioBlockSizeOut );
+    int GetNetwBufSizeOut() { return iCurAudioBlockSizeOut; }
+
+    int GetAudioBlockSizeIn() { return iCurAudioBlockSizeIn; }
 
     void SetNetwBufSizeFactOut ( const int iNewNetwBlSiFactOut );
     int GetNetwBufSizeFactOut() { return iCurNetwOutBlSiFact; }

src/client.cpp

@@ -194,11 +194,9 @@ void CClient::Init ( const int iPrefMonoBlockSizeSamAtSndCrdSamRate )
     iMonoBlockSizeSam   = iSndCrdMonoBlockSizeSam * SYSTEM_SAMPLE_RATE / SND_CRD_SAMPLE_RATE;
     iStereoBlockSizeSam = 2 * iMonoBlockSizeSam;
 
-
-// TEST
+    // the channel works on the same block size as the sound interface
     Channel.SetNetwBufSizeOut ( iMonoBlockSizeSam );
 
-
     vecsAudioSndCrdStereo.Init ( iSndCrdStereoBlockSizeSam );
     vecdAudioSndCrdMono.Init   ( iSndCrdMonoBlockSizeSam );
     vecdAudioSndCrdStereo.Init ( iSndCrdStereoBlockSizeSam );

src/client.h

@@ -114,6 +114,9 @@ public:
     }
     int GetSockBufSize() { return Channel.GetSockBufSize(); }
 
+    int GetNetwBufSizeOut() { return Channel.GetNetwBufSizeOut(); }
+    int GetAudioBlockSizeIn() { return Channel.GetAudioBlockSizeIn(); }
+
     void SetAudioCompressionOut ( const EAudComprType eNewAudComprTypeOut )
     {
         Channel.SetAudioCompressionOut ( eNewAudComprTypeOut );

src/clientsettingsdlg.cpp

@@ -63,6 +63,10 @@ CClientSettingsDlg::CClientSettingsDlg ( CClient* pNCliP, QWidget* parent,
     SliderNetBuf->setRange ( MIN_NET_BUF_SIZE_NUM_BL, MAX_NET_BUF_SIZE_NUM_BL );
     UpdateJitterBufferFrame();
 
+    // sound card buffer size
+    SliderSndCrdBufferDelay->setRange ( 0,
+        CSndCrdBufferSizes::GetNumOfBufferSizes() - 1 );
+
     // init combo box containing all available sound cards in the system
     cbSoundcard->clear();
     for ( int iSndDevIdx = 0; iSndDevIdx < pClient->GetSndInterface()->GetNumDev(); iSndDevIdx++ )
@@ -108,8 +112,11 @@ CClientSettingsDlg::CClientSettingsDlg ( CClient* pNCliP, QWidget* parent,
     QObject::connect ( &TimerPing, SIGNAL ( timeout() ),
         this, SLOT ( OnTimerPing() ) );
 
+    // slider controls
     QObject::connect ( SliderNetBuf, SIGNAL ( valueChanged ( int ) ),
         this, SLOT ( OnSliderNetBuf ( int ) ) );
+    QObject::connect ( SliderSndCrdBufferDelay, SIGNAL ( valueChanged ( int ) ),
+        this, SLOT ( OnSliderSndCrdBufferDelay ( int ) ) );
 
     // check boxes
     QObject::connect ( cbOpenChatOnNewMessage, SIGNAL ( stateChanged ( int ) ),
@@ -151,6 +158,11 @@ void CClientSettingsDlg::UpdateJitterBufferFrame()
     TextNetBuf->setEnabled   ( !pClient->GetDoAutoSockBufSize() );
 }
 
+void CClientSettingsDlg::UpdateSoundCardFrame()
+{
+    // TODO
+}
+
 void CClientSettingsDlg::showEvent ( QShowEvent* showEvent )
 {
     // only activate ping timer if window is actually shown
@@ -171,8 +183,20 @@ void CClientSettingsDlg::OnDriverSetupBut()
 void CClientSettingsDlg::OnSliderNetBuf ( int value )
 {
     pClient->SetSockBufSize ( value );
-    TextNetBuf->setText ( "Size: " + QString().setNum ( value ) );
-    UpdateDisplay();
+    UpdateJitterBufferFrame();
+}
+
+void CClientSettingsDlg::OnSliderSndCrdBufferDelay ( int value )
+{
+    // TODO
+
+
+// TODO put this in the function "UpdateSoundCardFrame"
+TextLabelPreferredSndCrdBufDelay->setText (
+    QString().setNum ( (double) CSndCrdBufferSizes::GetBufferSizeFromIndex ( value ) *
+    1000 / SND_CRD_SAMPLE_RATE, 'f', 2 ) + " ms (" +
+    QString().setNum ( CSndCrdBufferSizes::GetBufferSizeFromIndex ( value ) ) + ")" );
+
 }
 
 void CClientSettingsDlg::OnSoundCrdSelection ( int iSndDevIdx )
@@ -238,15 +262,11 @@ void CClientSettingsDlg::OnPingTimeResult ( int iPingTime )
     - the mean delay of a cyclic buffer is half the buffer size (since
       for the average it is assumed that the buffer is half filled)
     - consider the jitter buffer on the server side, too
-    - assume that the sound card introduces an additional delay of 2 * MIN_SERVER_BLOCK_DURATION_MS
 */
 
-// TODO revise this
+    const int iTotalJitterBufferDelayMS = MIN_SERVER_BLOCK_DURATION_MS *
+        ( 2 /* buffer at client and server */ * pClient->GetSockBufSize() ) / 2;
 
-const int iTotalJitterBufferDelayMS = 0;
-//    const int iTotalJitterBufferDelayMS = MIN_SERVER_BLOCK_DURATION_MS *
-//        ( 2 * pClient->GetSockBufSize() + pClient->GetNetwBufSizeFactIn() +
-//          pClient->GetNetwBufSizeFactOut() ) / 2;
 
 // TODO consider sound card interface block size
 
@@ -255,9 +275,9 @@ const int iTotalSoundCardDelayMS = 0;
 //        MIN_SERVER_BLOCK_DURATION_MS * ( pClient->GetSndInterface()->GetInNumBuf() +
 //          pClient->GetSndInterface()->GetOutNumBuf() ) / 2;
 
-// TODO
-    const int iDelayToFillNetworkPackets = 0;//MIN_SERVER_BLOCK_DURATION_MS *
-//        ( pClient->GetNetwBufSizeFactIn() + pClient->GetNetwBufSizeFactOut() );
+    const int iDelayToFillNetworkPackets =
+        ( pClient->GetNetwBufSizeOut() + pClient->GetAudioBlockSizeIn() ) *
+        1000 / SYSTEM_SAMPLE_RATE;
 
     const int iTotalBufferDelay = iDelayToFillNetworkPackets +
         iTotalJitterBufferDelayMS + iTotalSoundCardDelayMS;

src/clientsettingsdlg.h

@@ -73,11 +73,13 @@ protected:
     virtual void hideEvent ( QHideEvent* hideEvent );
 
     void UpdateJitterBufferFrame();
+    void UpdateSoundCardFrame();
 
 public slots:
     void OnTimerStatus() { UpdateDisplay(); }
     void OnTimerPing();
     void OnSliderNetBuf ( int value );
+    void OnSliderSndCrdBufferDelay ( int value );
     void OnAutoJitBuf ( int value );
     void OnOpenChatOnNewMessageStateChanged ( int value );
     void OnAudioCompressionButtonGroupClicked ( QAbstractButton* button );

src/util.h

@@ -436,6 +436,29 @@ public:
     int iAudioCodingArg;
 };
 
+class CSndCrdBufferSizes
+{
+public:
+    static int GetNumOfBufferSizes() { return 30; }
+    static int GetBufferSizeFromIndex ( const int iIdx )
+    {
+        if ( ( iIdx >= 0 ) && ( iIdx < 30 ) )
+        {
+            const int pSizes[30] = {
+                96, 128, 160, 192, 224, 256, 288, 320, 352,
+                384, 416, 448, 480, 512, 544, 576, 608, 640,
+                672, 704, 736, 768, 800, 832, 864, 896, 928,
+                960, 992, 1024 };
+            
+            return pSizes[iIdx];
+        }
+        else
+        {
+            return 0;
+        }
+    }
+};
+
 
 // Audio Reverbration ----------------------------------------------------------
 class CAudioReverb