Fix Linux hardware input device support by implementing running status for MidiEvent.Convert

Commons.Music.Midi.Shared/SMF.cs

@@ -309,25 +309,39 @@ public struct MidiEvent
 		public const byte EndSysEx = 0xF7;
 		public const byte Meta = 0xFF;
 
+		private static byte runningStatus;
+
 		public static IEnumerable<MidiEvent> Convert (byte[] bytes, int index, int size)
 		{
 			int i = index;
 			int end = index + size;
 			while (i < end) {
-				if (bytes [i] == 0xF0) {
-					yield return new MidiEvent (0xF0, 0, 0, bytes, index, size);
-					i += size;
+				if (bytes[i] >= 128) {
+					runningStatus = bytes[i];
+					if (bytes [i] == 0xF0) {
+						yield return new MidiEvent(0xF0, 0, 0, bytes, index, size);
+						i += size;
+					} else {
+						var z = MidiEvent.FixedDataSize (bytes [i]);
+						if (end < i + z)
+							throw new Exception (string.Format (
+								"Received data was incomplete to build MIDI status message for '{0:X}' status.",
+								bytes [i]));
+						yield return new MidiEvent (bytes [i],
+							(byte) (z > 0 ? bytes [i + 1] : 0),
+							(byte) (z > 1 ? bytes [i + 2] : 0),
+							null, 0, 0);
+						i += z + 1;
+					}
 				} else {
-					var z = MidiEvent.FixedDataSize (bytes [i]);
-					if (end < i + z)
-						throw new Exception (string.Format (
-							"Received data was incomplete to build MIDI status message for '{0:X}' status.",
-							bytes [i]));
-					yield return new MidiEvent (bytes [i],
-						(byte) (z > 0 ? bytes [i + 1] : 0),
-						(byte) (z > 1 ? bytes [i + 2] : 0),
+					var z = MidiEvent.FixedDataSize(runningStatus);
+					if (end < i + z - 1)
+						throw new Exception($"Received data was incomplete to build MIDI running status message for '{runningStatus:X}' status.");
+					yield return new MidiEvent(runningStatus,
+						bytes[i], 
+						(byte)((z > 1) ? bytes[i + 1] : 0), 
 						null, 0, 0);
-					i += z + 1;
+					i += z;
 				}
 			}
 		}