Made announcers repeat their lines less

src/GameSoundManager.cpp

@@ -83,6 +83,8 @@ static RageThread MusicThread;
 vector<RString> g_SoundsToPlayOnce;
 vector<RString> g_SoundsToPlayOnceFromDir;
 vector<RString> g_SoundsToPlayOnceFromAnnouncer;
+// This should get updated to unordered_map when once C++11 is supported
+std::map<RString, vector<int>> g_DirSoundOrder;
 
 struct MusicToPlay
 {
@@ -298,9 +300,31 @@ static void DoPlayOnceFromDir( RString sPath )
 	GetDirListing( sPath + "*.oga", arraySoundFiles );
 
 	if( arraySoundFiles.empty() )
+	{
 		return;
+	}
+	else if (arraySoundFiles.size() == 1)
+	{
+		DoPlayOnce(  sPath + arraySoundFiles[0]  );
+		return;
+	}
+
+	g_Mutex->Lock();
+	vector<int> &order = g_DirSoundOrder.insert({sPath, vector<int>()}).first->second;
+	// If order is exhausted, repopulate and reshuffle
+	if (order.size() == 0)
+	{
+		for (int i = 0; i < arraySoundFiles.size(); ++i)
+		{
+			order.push_back(i);
+		}
+		std::random_shuffle(order.begin(), order.end());
+	}
+
+	int index = order.back();
+	order.pop_back();
+	g_Mutex->Unlock();
 
-	int index = RandomInt( arraySoundFiles.size( ));
 	DoPlayOnce(  sPath + arraySoundFiles[index]  );
 }