1 files changed, 78 insertions, 0 deletions
diff --git a/src/libs/engine/MidiDriver.h b/src/libs/engine/MidiDriver.h
new file mode 100644
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--- /dev/null
+++ b/src/libs/engine/MidiDriver.h
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+/* This file is part of Om.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * Om 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.
+ * 
+ * Om 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 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
+ */
+
+#ifndef MIDIDRIVER_H
+#define MIDIDRIVER_H
+
+#include "Driver.h"
+#include <iostream>
+using std::cout; using std::endl;
+
+namespace Om {
+
+class MidiMessage;
+
+
+/** Midi driver abstract base class.
+ *
+ * \ingroup engine
+ */
+class MidiDriver : public Driver<MidiMessage>
+{
+public:
+	/** Prepare events (however neccessary) for the specified block (realtime safe) */
+	virtual void prepare_block(const samplecount block_start, const samplecount block_end) = 0;
+};
+
+
+
+/** Dummy MIDIDriver.
+ *
+ * Not abstract, all functions are dummies.  One of these will be allocated and
+ * "used" if no working MIDI driver is loaded.  (Doing it this way as opposed to
+ * just making MidiDriver have dummy functions makes sure any existing MidiDriver
+ * derived class actually implements the required functions).
+ *
+ * \ingroup engine
+ */
+class DummyMidiDriver : public MidiDriver
+{
+public:
+	DummyMidiDriver() {
+		cout << "[DummyMidiDriver] Started Dummy MIDI driver." << endl;
+	}
+	
+	~DummyMidiDriver() {}
+
+	void activate()   {}
+	void deactivate() {}
+	
+	bool is_activated() const { return false; }
+	bool is_enabled()   const { return false; }
+	
+	void enable()  {}
+	void disable() {}
+	
+	DriverPort* create_port(PortBase<MidiMessage>* patch_port) { return NULL; }
+	
+	void prepare_block(const samplecount block_start, const samplecount block_end) {}
+};
+
+
+
+} // namespace Om
+
+#endif // MIDIDRIVER_H