started to split out the midi drivers

svn-id: r5889

1 files changed, 43 insertions, 0 deletions

diff --git a/backends/midi/null.cpp b/backends/midi/null.cpp
new file mode 100644
index 0000000000..ea54c9826a
--- /dev/null
+++ b/backends/midi/null.cpp
@@ -0,0 +1,43 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001/2002 The ScummVM project
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ */
+
+#include "sound/mpu401.h"
+#include "common/engine.h"	// for warning/error/debug
+
+/* NULL driver */
+class MidiDriver_NULL : public MidiDriver_MPU401 {
+public:
+	int open(int mode);
+	void close() { }
+	void send(uint32 b) { }
+	void pause(bool p) { }
+	void set_stream_callback(void *param, StreamCallback *sc) { }
+};
+
+int MidiDriver_NULL::open(int mode)
+{
+	warning("Music not enabled - MIDI support selected with no MIDI driver available. Try Adlib");
+	return 0;
+}
+
+MidiDriver *MidiDriver_NULL_create()
+{
+	return new MidiDriver_NULL();
+}