Implement both ignoring all recognizers, but the ones specified and ignoring when app is not active.

Tools/speech_recognizer/GSSpeechRecognitionServer.h

@@ -35,6 +35,7 @@
 @interface GSSpeechRecognitionServer : NSObject
 {
   GSSpeechRecognitionEngine *_engine;
+  NSMutableArray *_blocking;
 }
 
 /**
@@ -42,7 +43,13 @@
  */
 + (id)sharedServer;
 
+// Start and stop processing....
 - (void) startListening;
 - (void) stopListening;
 
+// Add or remove from blocking list...
+- (void) addToBlockingRecognizers: (NSString *)s;
+- (void) removeFromBlockingRecognizers: (NSString *)s;
+- (BOOL) isBlocking: (NSString *)s;
+
 @end

Tools/speech_recognizer/GSSpeechRecognitionServer.m

@@ -100,7 +100,6 @@ static int _clients = 0;
     }
   
   _engine = [GSSpeechRecognitionEngine defaultSpeechRecognitionEngine];
-
   if (nil == _engine)
     {
       [self release];
@@ -110,10 +109,19 @@ static int _clients = 0;
     {
       NSLog(@"Got engine %@", _engine);
     }
-  
+
+  _blocking = [[NSMutableArray alloc] initWithCapacity: 10];  // 10 seems reasonable...
+
   return self;
 }
 
+- (void) dealloc
+{
+  RELEASE(_engine);
+  RELEASE(_blocking);
+  [super dealloc];
+}
+
 - (void) startListening
 {
   [_engine startListening];
@@ -124,4 +132,19 @@ static int _clients = 0;
   [_engine stopListening];
 }
 
+- (void) addToBlockingRecognizers: (NSString *)s
+{
+  [_blocking addObject: s];
+}
+
+- (void) removeFromBlockingRecognizers: (NSString *)s
+{
+  [_blocking removeObject: s];
+}
+
+- (BOOL) isBlocking: (NSString *)s
+{
+  return [_blocking containsObject: s];
+}
+
 @end