feat(MIDI): Support MidiInPort on iOS

src/Uno.UWP/Devices/Midi/Internal/MidiMessageParser.cs

@@ -22,23 +22,58 @@ public IMidiMessage Parse(byte[] bytes, TimeSpan timestamp)
 				throw new ArgumentException(nameof(bytes), "MIDI message cannot be empty");
 			}
 
+			// Parsing logic based on
+		    // https://www.midi.org/specifications-old/item/table-1-summary-of-midi-message
+
 			// Try to parse channel voice messages first
 			// These start with a unique combination of four bits and the remaining
 			// four represent the channel.
 
 			var upperBits = (byte)(bytes[0] & 0b_1111_0000);
-			var lowerBits = (byte)(bytes[0] & 0b_0000_1111);
-			if (upperBits == (byte)MidiMessageType.NoteOff)
+			switch (upperBits)
 			{
-				return new MidiNoteOffMessage(lowerBits, bytes[1], bytes[2]);
+				case (byte)MidiMessageType.NoteOff:
+					return new MidiNoteOffMessage(bytes, timestamp);
+				case (byte)MidiMessageType.NoteOn:
+					return new MidiNoteOnMessage(bytes, timestamp);
+				case (byte)MidiMessageType.PolyphonicKeyPressure:
+					return new MidiPolyphonicKeyPressureMessage(bytes, timestamp);
+				case (byte)MidiMessageType.ControlChange:
+					return new MidiControlChangeMessage(bytes, timestamp);
+				case (byte)MidiMessageType.ProgramChange:
+					return new MidiProgramChangeMessage(bytes, timestamp);
+				case (byte)MidiMessageType.ChannelPressure:
+					return new MidiChannelPressureMessage(bytes, timestamp);
+				case (byte)MidiMessageType.PitchBendChange:
+					return new MidiPitchBendChangeMessage(bytes, timestamp);
 			}
 
-		}
-
-		private static bool MatchesMessageType(byte firstByte, MidiMessageType messageType)
-		{
-			var encodedMessageType = (byte)messageType;
-			return (firstByte & encodedMessageType) == encodedMessageType;
+			// System common messages
+			switch (bytes[0])
+			{
+				case (byte)MidiMessageType.MidiTimeCode:
+					return new MidiTimeCodeMessage(bytes, timestamp);
+				case (byte)MidiMessageType.SongPositionPointer:
+					return new MidiSongPositionPointerMessage(bytes, timestamp);
+				case (byte)MidiMessageType.SongSelect:
+					return new MidiSongSelectMessage(bytes, timestamp);
+				case (byte)MidiMessageType.TuneRequest:
+					return new MidiTuneRequestMessage(bytes, timestamp);
+				case (byte)MidiMessageType.TimingClock:
+					return new MidiTimingClockMessage(bytes, timestamp);
+				case (byte)MidiMessageType.Start:
+					return new MidiStartMessage(bytes, timestamp);
+				case (byte)MidiMessageType.Continue:
+					return new MidiContinueMessage(bytes, timestamp);
+				case (byte)MidiMessageType.Stop:
+					return new MidiStopMessage(bytes, timestamp);
+				case (byte)MidiMessageType.ActiveSensing:
+					return new MidiActiveSensingMessage(bytes, timestamp);
+				case (byte)MidiMessageType.SystemReset:
+					return new MidiSystemResetMessage(bytes, timestamp);
+				default:
+					return new MidiSystemExclusiveMessage(bytes, timestamp);
+			}
 		}
 	}
 }

src/Uno.UWP/Devices/Midi/MidiActiveSensingMessage.cs

@@ -1,4 +1,5 @@
 using System;
+using Uno.Devices.Midi.Internal;
 using Windows.Storage.Streams;
 
 namespace Windows.Devices.Midi
@@ -16,6 +17,15 @@ public MidiActiveSensingMessage()
 			RawData = new InMemoryBuffer(new byte[] { (byte)Type });
 		}
 
+		internal MidiActiveSensingMessage(byte[] rawData, TimeSpan timestamp)
+		{
+			MidiMessageValidators.VerifyMessageLength(rawData, 1, Type);
+			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
+
+			RawData = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
+		}
+
 		/// <summary>
 		/// Gets the type of this MIDI message.
 		/// </summary>

src/Uno.UWP/Devices/Midi/MidiChannelPressureMessage.cs

@@ -28,14 +28,15 @@ public MidiChannelPressureMessage(byte channel, byte pressure)
 			});
 		}
 
-		internal MidiChannelPressureMessage(byte[] rawData)
+		internal MidiChannelPressureMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 2, MidiMessageType.ChannelPressure);
 			MidiMessageValidators.VerifyMessageType(rawData[0], MidiMessageType.ChannelPressure);
 			MidiMessageValidators.VerifyRange(MidiHelpers.GetChannel(rawData[0]), MidiMessageParameter.Channel);
 			MidiMessageValidators.VerifyRange(rawData[1], MidiMessageParameter.Pressure);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>
@@ -62,6 +63,6 @@ internal MidiChannelPressureMessage(byte[] rawData)
 		/// Gets the duration from when the MidiInPort was created to the time the message was received.
 		/// For messages being sent to a MidiOutPort, this value has no meaning.
 		/// </summary>
-		public TimeSpan Timestamp { get; internal set; } = TimeSpan.Zero;
+		public TimeSpan Timestamp { get; } = TimeSpan.Zero;
 	}
 }

src/Uno.UWP/Devices/Midi/MidiContinueMessage.cs

@@ -1,4 +1,5 @@
 using System;
+using Uno.Devices.Midi.Internal;
 using Windows.Storage.Streams;
 
 namespace Windows.Devices.Midi
@@ -16,6 +17,15 @@ public MidiContinueMessage()
 			RawData = new InMemoryBuffer(new byte[] { (byte)Type });
 		}
 
+		internal MidiContinueMessage(byte[] rawData, TimeSpan timestamp)
+		{
+			MidiMessageValidators.VerifyMessageLength(rawData, 1, Type);
+			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
+
+			RawData = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
+		}
+
 		/// <summary>
 		/// Gets the type of this MIDI message.
 		/// </summary>

src/Uno.UWP/Devices/Midi/MidiControlChangeMessage.cs

@@ -31,7 +31,7 @@ public MidiControlChangeMessage(byte channel, byte controller, byte controlValue
 			});
 		}
 
-		internal MidiControlChangeMessage(byte[] rawData)
+		internal MidiControlChangeMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 3, MidiMessageType.ControlChange);
 			MidiMessageValidators.VerifyMessageType(rawData[0], MidiMessageType.ControlChange);
@@ -40,6 +40,7 @@ internal MidiControlChangeMessage(byte[] rawData)
 			MidiMessageValidators.VerifyRange(rawData[2], MidiMessageParameter.ControlValue);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>
@@ -71,6 +72,6 @@ internal MidiControlChangeMessage(byte[] rawData)
 		/// Gets the duration from when the MidiInPort was created to the time the message was received.
 		/// For messages being sent to a MidiOutPort, this value has no meaning.
 		/// </summary>
-		public TimeSpan Timestamp { get; internal set; } = TimeSpan.Zero;
+		public TimeSpan Timestamp { get; } = TimeSpan.Zero;
 	}
 }

src/Uno.UWP/Devices/Midi/MidiInPort.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using Uno.Devices.Enumeration.Internal;
+using Uno.Devices.Midi.Internal;
 using Windows.Foundation;
 
 namespace Windows.Devices.Midi
@@ -15,6 +16,8 @@ public sealed partial class MidiInPort : IDisposable
 
 		private readonly object _syncLock = new object();
 
+		private MidiMessageParser _parser = new MidiMessageParser();
+
 		/// <summary>
 		/// Gets the id of the device that was used to initialize the MidiInPort.
 		/// </summary>
@@ -70,8 +73,10 @@ private void OnMessageReceived(byte[] message, TimeSpan timestamp)
 				return;
 			}
 
-			//read message type
-
+			// parse message
+			var parsedMessage = _parser.Parse(message, timestamp);
+			var eventArgs = new MidiMessageReceivedEventArgs(parsedMessage);
+			MessageReceived?.Invoke(this, eventArgs);
 		}
 	}
 }

src/Uno.UWP/Devices/Midi/MidiInPort.iOSmacOS.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Runtime.InteropServices.WindowsRuntime;
 using System.Text;
 using System.Threading.Tasks;
@@ -32,7 +33,12 @@ internal void Open()
 
 		private void NativePortMessageReceived(object sender, MidiPacketsEventArgs e)
 		{
-			throw new NotImplementedException();
+			foreach (var packet in e.Packets)
+			{
+				var bytes = new byte[packet.Length];
+				Marshal.Copy(packet.Bytes, bytes, 0, packet.Length);
+				OnMessageReceived(bytes, TimeSpan.FromMilliseconds(packet.TimeStamp));
+			}
 		}
 
 		public void Dispose()

src/Uno.UWP/Devices/Midi/MidiNoteOffMessage.cs

@@ -30,7 +30,7 @@ public MidiNoteOffMessage(byte channel, byte note, byte velocity)
 			});
 		}
 
-		internal MidiNoteOffMessage(byte[] rawData)
+		internal MidiNoteOffMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 3, Type);
 			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
@@ -39,6 +39,7 @@ internal MidiNoteOffMessage(byte[] rawData)
 			MidiMessageValidators.VerifyRange(rawData[2], MidiMessageParameter.Velocity);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>
@@ -70,6 +71,6 @@ internal MidiNoteOffMessage(byte[] rawData)
 		/// Gets the duration from when the MidiInPort was created to the time the message was received.
 		/// For messages being sent to a MidiOutPort, this value has no meaning.
 		/// </summary>
-		public TimeSpan Timestamp { get; internal set; } = TimeSpan.Zero;
+		public TimeSpan Timestamp { get; } = TimeSpan.Zero;
 	}
 }

src/Uno.UWP/Devices/Midi/MidiNoteOnMessage.cs

@@ -30,7 +30,7 @@ public MidiNoteOnMessage(byte channel, byte note, byte velocity)
 			});
 		}
 
-		internal MidiNoteOnMessage(byte[] rawData)
+		internal MidiNoteOnMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 3, Type);
 			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
@@ -39,6 +39,7 @@ internal MidiNoteOnMessage(byte[] rawData)
 			MidiMessageValidators.VerifyRange(rawData[2], MidiMessageParameter.Velocity);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>

src/Uno.UWP/Devices/Midi/MidiPitchBendChangeMessage.cs

@@ -29,14 +29,15 @@ public MidiPitchBendChangeMessage(byte channel, ushort bend)
 			});
 		}
 
-		internal MidiPitchBendChangeMessage(byte[] rawData)
+		internal MidiPitchBendChangeMessage(byte[] rawData, TimeSpan timestamp)
 		{			
 			MidiMessageValidators.VerifyMessageLength(rawData, 3, Type);
 			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
 			MidiMessageValidators.VerifyRange(MidiHelpers.GetChannel(rawData[0]), MidiMessageParameter.Channel);			
 			MidiMessageValidators.VerifyRange(MidiHelpers.GetBend(rawData[1], rawData[2]), MidiMessageParameter.Bend);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>
@@ -63,6 +64,6 @@ internal MidiPitchBendChangeMessage(byte[] rawData)
 		/// Gets the duration from when the MidiInPort was created to the time the message was received.
 		/// For messages being sent to a MidiOutPort, this value has no meaning.
 		/// </summary>
-		public TimeSpan Timestamp { get; internal set; } = TimeSpan.Zero;		
+		public TimeSpan Timestamp { get; } = TimeSpan.Zero;		
 	}
 }

src/Uno.UWP/Devices/Midi/MidiPolyphonicKeyPressureMessage.cs

@@ -31,7 +31,7 @@ public MidiPolyphonicKeyPressureMessage(byte channel, byte note, byte pressure)
 			});
 		}
 
-		internal MidiPolyphonicKeyPressureMessage(byte[] rawData)
+		internal MidiPolyphonicKeyPressureMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 3, Type);
 			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
@@ -40,6 +40,7 @@ internal MidiPolyphonicKeyPressureMessage(byte[] rawData)
 			MidiMessageValidators.VerifyRange(rawData[2], MidiMessageParameter.Pressure);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>
@@ -71,6 +72,6 @@ internal MidiPolyphonicKeyPressureMessage(byte[] rawData)
 		/// Gets the duration from when the MidiInPort was created to the time the message was received.
 		/// For messages being sent to a MidiOutPort, this value has no meaning.
 		/// </summary>
-		public TimeSpan Timestamp { get; internal set; } = TimeSpan.Zero;
+		public TimeSpan Timestamp { get; } = TimeSpan.Zero;
 	}
 }

src/Uno.UWP/Devices/Midi/MidiProgramChangeMessage.cs

@@ -28,14 +28,15 @@ public MidiProgramChangeMessage(byte channel, byte program)
 			});
 		}
 
-		internal MidiProgramChangeMessage(byte[] rawData)
+		internal MidiProgramChangeMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 2, Type);
 			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
 			MidiMessageValidators.VerifyRange(MidiHelpers.GetChannel(rawData[0]), MidiMessageParameter.Channel);
 			MidiMessageValidators.VerifyRange(rawData[1], MidiMessageParameter.Program);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>
@@ -62,6 +63,6 @@ internal MidiProgramChangeMessage(byte[] rawData)
 		/// Gets the duration from when the MidiInPort was created to the time the message was received.
 		/// For messages being sent to a MidiOutPort, this value has no meaning.
 		/// </summary>
-		public TimeSpan Timestamp { get; internal set; } = TimeSpan.Zero;
+		public TimeSpan Timestamp { get; } = TimeSpan.Zero;
 	}
 }

src/Uno.UWP/Devices/Midi/MidiSongPositionPointerMessage.cs

@@ -27,13 +27,14 @@ public MidiSongPositionPointerMessage(ushort beats)
 			});
 		}
 
-		internal MidiSongPositionPointerMessage(byte[] rawData)
+		internal MidiSongPositionPointerMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 3, Type);
 			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
 			MidiMessageValidators.VerifyRange(MidiHelpers.GetBeats(rawData[1], rawData[2]), MidiMessageParameter.Beats);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>

src/Uno.UWP/Devices/Midi/MidiSongSelectMessage.cs

@@ -27,13 +27,14 @@ public MidiSongSelectMessage(byte song)
 			});
 		}
 
-		internal MidiSongSelectMessage(byte[] rawData)
+		internal MidiSongSelectMessage(byte[] rawData, TimeSpan timestamp)
 		{
 			MidiMessageValidators.VerifyMessageLength(rawData, 2, Type);
 			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
 			MidiMessageValidators.VerifyRange(rawData[1], MidiMessageParameter.Song);
 
 			_buffer = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
 		}
 
 		/// <summary>

src/Uno.UWP/Devices/Midi/MidiStartMessage.cs

@@ -1,4 +1,5 @@
 using System;
+using Uno.Devices.Midi.Internal;
 using Windows.Storage.Streams;
 
 namespace Windows.Devices.Midi
@@ -19,6 +20,15 @@ public MidiStartMessage()
 			});
 		}
 
+		internal MidiStartMessage(byte[] rawData, TimeSpan timestamp)
+		{
+			MidiMessageValidators.VerifyMessageLength(rawData, 1, Type);
+			MidiMessageValidators.VerifyMessageType(rawData[0], Type);
+
+			RawData = new InMemoryBuffer(rawData);
+			Timestamp = timestamp;
+		}
+
 		/// <summary>
 		/// Gets the type of this MIDI message.
 		/// </summary>