better handling of sound card reinits

linux/sound.cpp

@@ -256,7 +256,7 @@ int CSound::bufferSizeCallback ( jack_nframes_t, void *arg )
 {
     CSound* pSound = reinterpret_cast<CSound*> ( arg );
 
-    pSound->EmitReinitRequestSignal();
+    pSound->EmitReinitRequestSignal ( RS_ONLY_RESTART_AND_INIT );
 
     return 0; // zero on success, non-zero on error
 }

mac/sound.cpp

@@ -498,11 +498,7 @@ OSStatus CSound::deviceNotification ( AudioDeviceID,
         // xrun handling (it is important to act on xruns under CoreAudio
         // since it seems that the xrun situation stays stable for a
         // while and would give you a long time bad audio
-
-// TEST we reuse the signal which was intended only for Windows OS but
-// with a modification in the client (see client.cpp)
-pSound->EmitReinitRequestSignal();
-
+        pSound->EmitReinitRequestSignal ( RS_ONLY_RESTART );
     }
 
     return noErr;

src/client.cpp

@@ -128,8 +128,8 @@ CClient::CClient ( const quint16 iPortNumber ) :
         SIGNAL ( CLPingWithNumClientsReceived ( CHostAddress, int, int ) ),
         this, SLOT ( OnCLPingWithNumClientsReceived ( CHostAddress, int, int ) ) );
 
-    QObject::connect ( &Sound, SIGNAL ( ReinitRequest() ),
-        this, SLOT ( OnSndCrdReinitRequest() ) );
+    QObject::connect ( &Sound, SIGNAL ( ReinitRequest ( ESndCrdResetType ) ),
+        this, SLOT ( OnSndCrdReinitRequest ( ESndCrdResetType ) ) );
 }
 
 void CClient::OnSendProtMessage ( CVector<uint8_t> vecMessage )
@@ -443,7 +443,7 @@ void CClient::SetSndCrdRightOutputChannel ( const int iNewChan )
     }
 }
 
-void CClient::OnSndCrdReinitRequest()
+void CClient::OnSndCrdReinitRequest ( ESndCrdResetType eSndCrdResetType )
 {
     // if client was running then first
     // stop it and restart again after new initialization
@@ -453,31 +453,20 @@ void CClient::OnSndCrdReinitRequest()
         Sound.Stop();
     }
 
-    // reinit the driver (we use the currently selected driver) and
-    // init client object, too
+    // perform reinit request as indicated by the request type parameter
+    if ( eSndCrdResetType != RS_ONLY_RESTART )
+    {
+        if ( eSndCrdResetType != RS_ONLY_RESTART_AND_INIT )
+        {
+            // reinit the driver if requested
+            // (we use the currently selected driver)
+            Sound.SetDev ( Sound.GetDev() );
+        }
 
-// TODO possible bug: In ASIO driver if set dev is called, the driver is
-// unloaded. See ASIO manual: "Note: A host application has to defer
-// processing of these notification to a later "secure" time as the
-// driver has finish its processing of the notification. Especially on
-// the kAsioResetRequest it is a bad idea to unload the driver during
-// the asioMessage callback since the callback has to return back into
-// the driver, which is no longer present."
-
-// TODO write separate driver reset function in sound base instead
-// of doing setdev with the old driver ID -> avoid unloading driver
-
-    Sound.SetDev ( Sound.GetDev() );
-
-// This is a test. We reuse the SndCrdReinitRequest which was
-// initially only intended for the Windows OS. But for Mac we
-// must not call the client Init function to work properly, therefore
-// we add the preprocesser check here
-// TODO better solution was to introduce a new signal in the sound base
-// and a new signal handler in the client
-#if !defined ( __APPLE__ ) && !defined ( __MACOSX )
-    Init();
-#endif
+        // init client object (must always be performed if the driver
+        // was changed)
+        Init();
+    }
 
     if ( bWasRunning )
     {

src/client.h

@@ -335,7 +335,7 @@ public slots:
                                           int          iMs,
                                           int          iNumClients );
 
-    void OnSndCrdReinitRequest();
+    void OnSndCrdReinitRequest ( ESndCrdResetType eSndCrdResetType );
 
 signals:
     void ConClientListMesReceived ( CVector<CChannelShortInfo> vecChanInfo );

src/soundbase.h

@@ -32,6 +32,16 @@
 #include "util.h"
 
 
+// TODO better solution with enum definition
+// problem: in signals it seems not to work to use CSoundBase::ESndCrdResetType
+enum ESndCrdResetType
+{
+    RS_ONLY_RESTART,
+    RS_ONLY_RESTART_AND_INIT,
+    RS_RELOAD_RESTART_AND_INIT
+};
+
+
 /* Classes ********************************************************************/
 class CSoundBase : public QThread
 {
@@ -73,7 +83,8 @@ public:
 
     // TODO this should be protected but since it is used
     // in a callback function it has to be public -> better solution
-    void EmitReinitRequestSignal() { emit ReinitRequest(); }
+    void EmitReinitRequestSignal ( const ESndCrdResetType eSndCrdResetType )
+        { emit ReinitRequest ( eSndCrdResetType ); }
 
 protected:
     // driver handling
@@ -109,7 +120,7 @@ protected:
     QString          strDriverNames[MAX_NUMBER_SOUND_CARDS];
 
 signals:
-    void ReinitRequest();
+    void ReinitRequest ( ESndCrdResetType eSndCrdResetType );
 };
 
 #endif /* !defined ( SOUNDBASE_HOIHGEH8_3_4344456456345634565KJIUHF1912__INCLUDED_ ) */

windows/sound.cpp

@@ -959,6 +959,7 @@ long CSound::asioMessages ( long selector,
                             double* )
 {
     long ret = 0;
+
     switch ( selector )
     {
         case kAsioEngineVersion:
@@ -968,26 +969,16 @@ long CSound::asioMessages ( long selector,
 
         // both messages might be send if the buffer size changes
         case kAsioBufferSizeChange:
+            pSound->EmitReinitRequestSignal ( RS_ONLY_RESTART_AND_INIT );
+            ret = 1L; // 1L if request is accepted or 0 otherwise
+            break;
+
         case kAsioResetRequest:
-
-
-// TODO implement separate ASIO reset function in base class!
-
-// kAsioBufferSizeChange:
-// Informs the application that the driver has a new preferred buffer size.
-//
-// kAsioResetRequest:
-// Requests a driver reset. If accepted, this will close the driver
-// (ASIOExit() ) and re-open it again (ASIOInit() etc.) at the next
-// "safe" time (usually during the application IDLE time). Some
-// drivers need to reconfigure for instance when the sample rate
-// changes, or some basic changes have been made in ASIOControlPanel().
-
-
-            pSound->EmitReinitRequestSignal();
+            pSound->EmitReinitRequestSignal ( RS_RELOAD_RESTART_AND_INIT );
             ret = 1L; // 1L if request is accepted or 0 otherwise
             break;
     }
+
     return ret;
 }