Absorbed last tidbits of mididrv.cpp into other files

svn-id: r7606

sound/mididrv.h

@@ -56,7 +56,7 @@ public:
 	virtual void send(uint32 b) = 0;
 
 	// Get or set a property
-	virtual uint32 property(int prop, uint32 param);
+	virtual uint32 property(int prop, uint32 param) { return 0; }
 
 	// Retrieve a string representation of an error code
 	static const char *getErrorName(int error_code);

sound/mpu401.cpp

@@ -62,6 +62,20 @@ void MidiChannel_MPU401::sysEx_customInstrument(uint32 type, byte *instr) {
 	_owner->sysEx_customInstrument (_channel, type, instr);
 }
 
+const char *MidiDriver::getErrorName(int error_code) {
+	static const char *const midi_errors[] = {
+		"No error",
+		"Cannot connect",
+		"Streaming not available",
+		"Device not available",
+		"Driver already open"
+	};
+
+	if ((uint) error_code >= ARRAYSIZE(midi_errors))
+		return "Unknown Error";
+	return midi_errors[error_code];
+}
+
 MidiDriver_MPU401::MidiDriver_MPU401() : MidiDriver() {
 	uint i;