Correct JackWinMMEDriver and JackALSARawMidiDriver creation.

linux/alsarawmidi/JackALSARawMidiDriver.cpp

@@ -624,6 +624,9 @@ JackALSARawMidiDriver::Write()
 #ifdef __cplusplus
 extern "C" {
 #endif
+    
+    // singleton kind of driver
+    static Jack::JackALSARawMidiDriver* driver = NULL;
 
     SERVER_EXPORT jack_driver_desc_t *
     driver_get_descriptor()
@@ -639,14 +642,19 @@ extern "C" {
     driver_initialize(Jack::JackLockedEngine *engine, Jack::JackSynchro *table,
                       const JSList *params)
     {
-        Jack::JackDriverClientInterface *driver =
-            new Jack::JackALSARawMidiDriver("system_midi", "alsarawmidi",
-                                            engine, table);
-        if (driver->Open(0, 0, 1, 1, 0, 0, false, "midi in", "midi out", 0, 0)) {
-            delete driver;
-            driver = 0;
+        // singleton kind of driver
+        if (!driver) {
+            driver = new Jack::JackALSARawMidiDriver("system_midi", "alsarawmidi", engine, table);
+            if (driver->Open(1, 1, 0, 0, false, "midi in", "midi out", 0, 0) == 0) {
+                return driver;
+            } else {
+                delete driver;
+                return NULL;
+            }
+        } else {
+            jack_info("JackALSARawMidiDriver already allocated, cannot be loaded twice");
+            return NULL;
         }
-        return driver;
     }
 
 #ifdef __cplusplus

windows/winmme/JackWinMMEDriver.cpp

@@ -359,7 +359,7 @@ extern "C"
 #endif
 
     // singleton kind of driver
-    static Jack::JackDriverClientInterface* driver = NULL;
+    static Jack::JackWinMMEDriver* driver = NULL;
 
     SERVER_EXPORT jack_driver_desc_t * driver_get_descriptor()
     {
@@ -411,7 +411,7 @@ extern "C"
         // singleton kind of driver
         if (!driver) {
             driver = new Jack::JackWinMMEDriver("system_midi", "winmme", engine, table);
-            if (driver->Open(0, 0, 1, 1, 0, 0, false, "in", "out", 0, 0) == 0) {
+            if (driver->Open(1, 1, 0, 0, false, "in", "out", 0, 0) == 0) {
                 return driver;
             } else {
                 delete driver;