Singleton behaviour for JackCoreMidiDriver and JackWinMMEDriver.

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@4530 0c269be4-1314-0410-8aa9-9f06e86f4224

ChangeLog

@@ -41,6 +41,7 @@ Chris Caudle
 	* Non blocking notifications in JackEngine::NotifyAddClient and JackEngine::NotifyRemoveClient.
 	* More robust Control API implementation.
 	* Add jackctl_driver_get_type in Control API.
+	* Singleton behaviour for JackCoreMidiDriver and JackWinMMEDriver.
 
 2011-07-29 Stephane Letz  <letz@grame.fr>
 

macosx/coremidi/JackCoreMidiDriver.cpp

@@ -275,6 +275,7 @@ JackCoreMidiDriver::Open(bool capturing, bool playing, int in_channels,
         return -1;
     }
     char *client_name = fClientControl.fName;
+    printf("JackCoreMidiDriver::Open client_name %s\n",client_name);
 
     // Allocate and connect physical inputs
     potential_pi_count = MIDIGetNumberOfSources();
@@ -632,6 +633,9 @@ JackCoreMidiDriver::Write()
 extern "C" {
 #endif
 
+    // singleton kind of driver
+    static Jack::JackDriverClientInterface* driver = NULL;
+
     SERVER_EXPORT jack_driver_desc_t * driver_get_descriptor()
     {
         jack_driver_desc_t * desc;
@@ -669,11 +673,17 @@ extern "C" {
                 }
         }
 
-        Jack::JackDriverClientInterface* driver = new Jack::JackCoreMidiDriver("system_midi", "coremidi", engine, table);
-        if (driver->Open(1, 1, virtual_in, virtual_out, false, "in", "out", 0, 0) == 0) {
-            return driver;
+         // singleton kind of driver
+        if (!driver) {
+            driver = new Jack::JackCoreMidiDriver("system_midi", "coremidi", engine, table);
+            if (driver->Open(1, 1, virtual_in, virtual_out, false, "in", "out", 0, 0) == 0) {
+                return driver;
+            } else {
+                delete driver;
+                return NULL;
+            }
         } else {
-            delete driver;
+            jack_info("JackCoreMidiDriver already allocated, cannot be loaded twice");
             return NULL;
         }
     }

windows/winmme/JackWinMMEDriver.cpp

@@ -357,6 +357,9 @@ extern "C"
 {
 #endif
 
+     // singleton kind of driver
+    static Jack::JackDriverClientInterface* driver = NULL;
+
     SERVER_EXPORT jack_driver_desc_t * driver_get_descriptor()
     {
         jack_driver_desc_t * desc;
@@ -406,13 +409,20 @@ extern "C"
         }
         */
 
-        Jack::JackDriverClientInterface* driver = new Jack::JackWinMMEDriver("system_midi", "winmme", engine, table);
-        if (driver->Open(1, 1, 0, 0, false, "in", "out", 0, 0) == 0) {
-            return driver;
+        // singleton kind of driver
+        if (!driver) {
+            driver = new Jack::JackWinMMEDriver("system_midi", "winmme", engine, table);
+            if (driver->Open(1, 1, virtual_in, virtual_out, false, "in", "out", 0, 0) == 0) {
+                return driver;
+            } else {
+                delete driver;
+                return NULL;
+            }
         } else {
-            delete driver;
+            jack_info("JackWinMMEDriver already allocated, cannot be loaded twice");
             return NULL;
         }
+
     }
 
 #ifdef __cplusplus