[CoreMidi] Add missing CoreMIDI bindings and MidiEventList support. by rolfbjarne · Pull Request #24738 · dotnet/macios

rolfbjarne · 2026-02-18T19:27:38Z

Bind the following missing CoreMIDI APIs:

MIDIDeviceCreate/MIDIDeviceDispose
MIDIExternalDeviceCreate
MIDISetupAddDevice/MIDISetupRemoveDevice
MIDISetupAddExternalDevice/MIDISetupRemoveExternalDevice
MIDIEntityAddOrRemoveEndpoints
MIDIDeviceRemoveEntity
MIDIEndPointGetRefCons/MIDIEndPointSetRefCons
MIDIDriverEnableMonitoring
MIDIGetDriverDeviceList/MIDIGetDriverIORunLoop
MIDISendSysex/MIDISendUMPSysex
MIDIDestinationCreateWithProtocol
MIDISourceCreateWithProtocol
MIDIInputPortCreateWithProtocol
MIDIClientCreateWithBlock
MIDIEventPacketSysexBytesForGroup
MIDI 2.0 structs (MIDI2DeviceManufacturer, MIDI2DeviceRevisionLevel,
MIDICIProfileID, MIDISysexSendRequest, MIDISysexSendRequestUMP)
MidiDriver abstract class for implementing custom MIDI drivers

Add MidiEventList and MidiEventPacket classes for MIDI 2.0 Universal MIDI
Packet (UMP) support (MIDIEventList/MIDIEventPacket structs).

Add comprehensive tests including a Happy Birthday melody test.

There's a sample project in progress here: dotnet/macios-samples#10.

Fixes #4452
Fixes #12489

Bind the following missing CoreMIDI APIs: - MIDIDeviceCreate/MIDIDeviceDispose - MIDIExternalDeviceCreate - MIDISetupAddDevice/MIDISetupRemoveDevice - MIDISetupAddExternalDevice/MIDISetupRemoveExternalDevice - MIDIEntityAddOrRemoveEndpoints - MIDIDeviceRemoveEntity - MIDIEndPointGetRefCons/MIDIEndPointSetRefCons - MIDIDriverEnableMonitoring - MIDIGetDriverDeviceList/MIDIGetDriverIORunLoop - MIDISendSysex/MIDISendUMPSysex - MIDIDestinationCreateWithProtocol - MIDISourceCreateWithProtocol - MIDIInputPortCreateWithProtocol - MIDIClientCreateWithBlock - MIDIEventPacketSysexBytesForGroup - MIDI 2.0 structs (MIDI2DeviceManufacturer, MIDI2DeviceRevisionLevel, MIDICIProfileID, MIDISysexSendRequest, MIDISysexSendRequestUMP) - MidiDriver abstract class for implementing custom MIDI drivers Add MidiEventList and MidiEventPacket classes for MIDI 2.0 Universal MIDI Packet (UMP) support (MIDIEventList/MIDIEventPacket structs). Add comprehensive tests including a Happy Birthday melody test. There's a sample project in progress here: dotnet/macios-samples#10. Fixes #4452 Fixes #12489

Copilot

Pull request overview

This PR adds comprehensive CoreMIDI bindings for missing APIs and implements MIDI 2.0 Universal MIDI Packet (UMP) support, addressing issues #4452 and #12489. The changes enable developers to work with MIDI devices at a lower level, including custom driver implementation, and provide full support for the modern MIDI 2.0 protocol.

Changes:

Added MidiEventList and MidiEventPacket classes for MIDI 2.0 UMP support, enabling Universal MIDI Packet handling
Implemented missing CoreMIDI device/entity management APIs (Create, Dispose, AddOrRemoveEndpoints, etc.) and sysex sending functionality
Introduced experimental MidiDriver abstract class for implementing custom MIDI drivers with full lifecycle management

Reviewed changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
tests/xtro-sharpie/api-annotations-dotnet/*.ignore	Removed API ignore entries for newly bound CoreMIDI APIs across all platforms
tests/cecil-tests/Documentation.cs	Added FunctionPointerType handling to return empty doc IDs for unmanaged function pointers
tests/cecil-tests/Documentation.KnownFailures.txt	Removed known failures for newly documented CoreMIDI types and fixed function pointer doc IDs
tests/monotouch-test/CoreMidi/MidiEventPacketTest.cs	Comprehensive unit tests for MidiEventPacket struct including bounds checking and data manipulation
tests/monotouch-test/CoreMidi/MidiEventListTest.cs	Unit tests for MidiEventList covering construction, adding packets, iteration, and edge cases
tests/monotouch-test/CoreMidi/MidiEndpointTest.cs	Added tests for GetRefCons/SetRefCons endpoint reference management APIs
tests/monotouch-test/CoreMidi/MidiDeviceTest.cs	Tests for external device creation and MidiSetup add/remove operations
tests/monotouch-test/CoreMidi/MidiComprehensiveTest.cs	Extensive integration tests including a complete "Happy Birthday" melody demonstration
src/frameworks.sources	Registered new CoreMidi and CoreFoundation source files in the build system
src/coremidi.cs	Added MidiDriverProperty enum for driver-specific properties
src/CoreMidi/MidiThruConnectionParams.cs	Moved enum definitions outside TVOS conditional to fix tvOS build issues
src/CoreMidi/MidiStructs.cs	Implemented MIDI 2.0 structs (Midi2DeviceManufacturer, Midi2DeviceRevisionLevel, MidiCIProfileId variants, MidiSysexSendRequest)
src/CoreMidi/MidiServices.cs	Added device/entity creation, external device support, sysex async sending, and protocol-aware port/endpoint creation methods
src/CoreMidi/MidiEventPacket.cs	Implemented MidiEventPacket struct with 64-word capacity, indexer, and GetSysexBytes method
src/CoreMidi/MidiEventList.cs	Implemented MidiEventList as IDisposable wrapper with Add, Send, Receive, and iteration support
src/CoreMidi/MidiDriverInterface.cs	Created experimental MidiDriver abstract class with COM-style interface for custom driver implementation
src/CoreMidi/MidiBluetoothDriver.cs	Removed TVOS conditional and added XML documentation for Bluetooth driver methods
src/CoreFoundation/CFUuidBytes.cs	Added CFUuidBytes struct for CoreMIDI driver interface QueryInterface method
docs/preview-apis.md	Documented MidiDriver as experimental (APL0004) until .NET 12

Copilot · 2026-02-18T19:32:29Z

tests/monotouch-test/CoreMidi/MidiEventListTest.cs

+		public void CtorTest_Size ()
+		{
+			Exception ex;
+
+			Assert.Multiple (() => {
+				ex = Assert.Throws<ArgumentOutOfRangeException> (() => new MidiEventList (MidiProtocolId.Protocol_1_0, int.MinValue), "AOORE int.MinValue");
+				Assert.That (ex.Message, Does.Contain ("size must be at least 276."), "AOORE msg int.MinValue");
+				ex = Assert.Throws<ArgumentOutOfRangeException> (() => new MidiEventList (MidiProtocolId.Protocol_1_0, -1), "AOORE -1");
+				Assert.That (ex.Message, Does.Contain ("size must be at least 276."), "AOORE msg -1");
+				ex = Assert.Throws<ArgumentOutOfRangeException> (() => new MidiEventList (MidiProtocolId.Protocol_1_0, 0), "AOORE 0");
+				Assert.That (ex.Message, Does.Contain ("size must be at least 276."), "AOORE msg 0");
+				ex = Assert.Throws<ArgumentOutOfRangeException> (() => new MidiEventList (MidiProtocolId.Protocol_1_0, 275), "AOORE 275");
+				Assert.That (ex.Message, Does.Contain ("size must be at least 276."), "AOORE msg 275");
+
+				var obj = new MidiEventList (MidiProtocolId.Protocol_1_0, 276);
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_1_0), "Protocol");
+				Assert.That (obj.PacketCount, Is.EqualTo (0), "PacketCount");
+				var packets = obj.ToArray ();
+				Assert.That (packets.Length, Is.EqualTo (0), "ToArray ().Length");
+			});


The MidiEventList instances created in these tests are not being disposed. Since MidiEventList allocates unmanaged memory when owns=true, these should be wrapped in using statements to ensure proper cleanup. For example: using var obj = new MidiEventList (MidiProtocolId.Protocol_1_0, 276);

Copilot · 2026-02-18T19:32:29Z

tests/monotouch-test/CoreMidi/MidiEventListTest.cs

+		public void AddTest ()
+		{
+			Assert.Multiple (() => {
+				var obj = new MidiEventList (MidiProtocolId.Protocol_2_0);
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_2_0), "Protocol");
+				Assert.That (obj.PacketCount, Is.EqualTo (0), "PacketCount");
+
+				var rv = obj.Add (123, new uint [] { 1, 2, 3 });
+				Assert.That (rv, Is.EqualTo (true), "Add B");
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_2_0), "Protocol B");
+				Assert.That (obj.PacketCount, Is.EqualTo (1), "PacketCount B");
+
+				var packets = obj.ToArray ();
+				Assert.That (packets.Length, Is.EqualTo (1), "ToArray ().Length");
+				Assert.That (packets [0].Timestamp, Is.EqualTo (123), "Item[0].Timestamp");
+				Assert.That (packets [0].WordCount, Is.EqualTo (3), "Item[0].WordCount");
+				Assert.That (packets [0].Words, Is.EqualTo (new uint [] { 1, 2, 3 }), "Item[0].Words");
+			});
+		}


The MidiEventList instance created in this test is not being disposed. Since MidiEventList allocates unmanaged memory when owns=true, this should be wrapped in a using statement to ensure proper cleanup. For example: using var obj = new MidiEventList (MidiProtocolId.Protocol_2_0);

Copilot · 2026-02-18T19:32:29Z

tests/monotouch-test/CoreMidi/MidiEventListTest.cs

+		[Test]
+		public void AddTest_ManyWords ()
+		{
+			Assert.Multiple (() => {
+				var obj = new MidiEventList (MidiProtocolId.Protocol_2_0);
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_2_0), "Protocol");
+				Assert.That (obj.PacketCount, Is.EqualTo (0), "PacketCount");
+
+				var manyWords = Enumerable.Range (1, 65).Select (v => (uint) v).ToArray ();
+				var rv = obj.Add (123, manyWords);
+				Assert.That (rv, Is.EqualTo (false), "Add B");
+			});
+		}


The MidiEventList instance created in this test is not being disposed. Since MidiEventList allocates unmanaged memory when owns=true, this should be wrapped in a using statement to ensure proper cleanup.

Copilot · 2026-02-18T19:32:30Z

tests/monotouch-test/CoreMidi/MidiEventListTest.cs

+		[Test]
+		public void AddTest_NotEnoughSpace ()
+		{
+			Assert.Multiple (() => {
+				var obj = new MidiEventList (MidiProtocolId.Protocol_2_0);
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_2_0), "Protocol");
+				Assert.That (obj.PacketCount, Is.EqualTo (0), "PacketCount");
+
+				var fitsTwice = Enumerable.Range (1, 24).Select (v => (uint) v).ToArray ();
+				var rv = obj.Add (123, fitsTwice);
+				Assert.That (rv, Is.EqualTo (true), "Add B");
+				rv = obj.Add (456, fitsTwice);
+				Assert.That (rv, Is.EqualTo (true), "Add C");
+				rv = obj.Add (789, fitsTwice);
+				Assert.That (rv, Is.EqualTo (false), "Add C");
+			});
+		}


The MidiEventList instance created in this test is not being disposed. Since MidiEventList allocates unmanaged memory when owns=true, this should be wrapped in a using statement to ensure proper cleanup.

Copilot · 2026-02-18T19:32:30Z

tests/monotouch-test/CoreMidi/MidiEventListTest.cs

+		[Test]
+		public void EnumeratorTest ()
+		{
+			Assert.Multiple (() => {
+				var obj = new MidiEventList (MidiProtocolId.Protocol_2_0);
+				var rv = obj.Add (789, new uint [] { 4, 5, 6 });
+				Assert.That (rv, Is.EqualTo (true), "Add B");
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_2_0), "Protocol B");
+				Assert.That (obj.PacketCount, Is.EqualTo (1), "PacketCount B");
+
+				var packets = obj.ToArray ();
+				Assert.That (packets.Length, Is.EqualTo (1), "ToArray ().Length");
+				Assert.That (packets [0].Timestamp, Is.EqualTo (789), "Item[0].Timestamp");
+				Assert.That (packets [0].WordCount, Is.EqualTo (3), "Item[0].WordCount");
+				Assert.That (packets [0].Words, Is.EqualTo (new uint [] { 4, 5, 6 }), "Item[0].Words");
+			});
+		}


The MidiEventList instance created in this test is not being disposed. Since MidiEventList allocates unmanaged memory when owns=true, this should be wrapped in a using statement to ensure proper cleanup.

Copilot · 2026-02-18T19:32:30Z

tests/monotouch-test/CoreMidi/MidiEventListTest.cs

+		[Test]
+		public void IteratorTest ()
+		{
+			Assert.Multiple (() => {
+				var obj = new MidiEventList (MidiProtocolId.Protocol_2_0);
+				var rv = obj.Add (456, new uint [] { 1, 2, 3, 4, 5, 6 });
+				Assert.That (rv, Is.EqualTo (true), "Add B");
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_2_0), "Protocol B");
+				Assert.That (obj.PacketCount, Is.EqualTo (1), "PacketCount B");
+
+				var packets = obj.ToArray ();
+				Assert.That (packets.Length, Is.EqualTo (1), "ToArray ().Length");
+				Assert.That (packets [0].Timestamp, Is.EqualTo (456), "Item[0].Timestamp");
+				Assert.That (packets [0].WordCount, Is.EqualTo (6), "Item[0].WordCount");
+				Assert.That (packets [0].Words, Is.EqualTo (new uint [] { 1, 2, 3, 4, 5, 6 }), "Item[0].Words");
+
+				var packetList = new List<MidiEventPacket> ();
+				obj.Iterate ((ref MidiEventPacket packet) => {
+					packetList.Add (packet);
+				});
+				Assert.That (packetList.Count, Is.EqualTo (1), "packetList.Length");
+				Assert.That (packetList [0].Timestamp, Is.EqualTo (456), "packetList[0].Timestamp");
+				Assert.That (packetList [0].WordCount, Is.EqualTo (6), "packetList[0].WordCount");
+				Assert.That (packetList [0].Words, Is.EqualTo (new uint [] { 1, 2, 3, 4, 5, 6 }), "packetList[0].Words");
+			});
+		}


The MidiEventList instance created in this test is not being disposed. Since MidiEventList allocates unmanaged memory when owns=true, this should be wrapped in a using statement to ensure proper cleanup.

Copilot · 2026-02-18T19:32:30Z

src/CoreMidi/MidiEventList.cs

+		}
+#endif
+
+		/// <summary>Add a new <see cref="MidiEventPacket" /> to this lis.</summary>


There's a typo in the XML documentation: "lis" should be "list".

Suggested change

/// <summary>Add a new <see cref="MidiEventPacket" /> to this lis.</summary>

/// <summary>Add a new <see cref="MidiEventPacket" /> to this list.</summary>

Copilot · 2026-02-18T19:32:31Z

src/CoreMidi/MidiEventList.cs

+		}
+
+		/// <summary>Distribute the packets from the specified <paramref name="source" />.</summary>
+		/// <param name="source">The endpoint where the packates come from.</param>


There's a typo in the XML documentation: "packates" should be "packets".

Suggested change

/// <param name="source">The endpoint where the packates come from.</param>

/// <param name="source">The endpoint where the packets come from.</param>

Copilot · 2026-02-18T19:32:31Z

src/CoreMidi/MidiDriverInterface.cs

+			return 0;
+		}
+
+		static List<MidiDriver> strongReferences = new List<MidiDriver> ();


The static List<MidiDriver> field should be initialized as readonly to prevent accidental reassignment. Consider: static readonly List<MidiDriver> strongReferences = new List<MidiDriver> ();

Suggested change

static List<MidiDriver> strongReferences = new List<MidiDriver> ();

static readonly List<MidiDriver> strongReferences = new List<MidiDriver> ();

Copilot · 2026-02-18T19:32:31Z

tests/monotouch-test/CoreMidi/MidiEventListTest.cs

+		public void CtorTest ()
+		{
+			Assert.Multiple (() => {
+				var obj = new MidiEventList (MidiProtocolId.Protocol_1_0);
+				Assert.That (obj.Protocol, Is.EqualTo (MidiProtocolId.Protocol_1_0), "Protocol");
+				Assert.That (obj.PacketCount, Is.EqualTo (0), "PacketCount");
+				var packets = obj.ToArray ();
+				Assert.That (packets.Length, Is.EqualTo (0), "ToArray ().Length");
+			});


The MidiEventList instances created in these tests are not being disposed. Since MidiEventList allocates unmanaged memory when owns=true, these should be wrapped in using statements to ensure proper cleanup. For example: using var obj = new MidiEventList (MidiProtocolId.Protocol_1_0);

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

vs-mobiletools-engineering-service2 · 2026-02-19T11:34:21Z

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vs-mobiletools-engineering-service2 · 2026-02-19T11:37:15Z

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vs-mobiletools-engineering-service2 · 2026-02-19T12:15:54Z

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vs-mobiletools-engineering-service2 · 2026-02-19T14:18:34Z

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vs-mobiletools-engineering-service2 · 2026-02-19T14:41:54Z

🔥 [CI Build #9db33b7] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

0 tests crashed, 4 tests failed, 152 tests passed.

Failures

❌ linker tests [attempt 2]

1 tests failed, 43 tests passed.

Failed tests

link all/iOS - simulator/Release: LaunchFailure

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❌ monotouch tests (iOS) [attempt 2]

1 tests failed, 10 tests passed.

Failed tests

monotouch-test/iOS - simulator/Release (all optimizations): Crashed

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❌ monotouch tests (MacCatalyst) [attempt 2]

2 tests failed, 13 tests passed.

Failed tests

monotouch-test/Mac Catalyst/Release (NativeAOT): Failed (Test run failed.
Tests run: 3774 Passed: 3532 Inconclusive: 11 Failed: 15 Ignored: 227)
monotouch-test/Mac Catalyst/Debug (interpreter): Failed (Test run failed.
Tests run: 3777 Passed: 3556 Inconclusive: 10 Failed: 15 Ignored: 206)

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✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
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✅ framework: All 2 tests passed. Html Report (VSDrops) Download
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✅ generator: All 5 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 12 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 11 tests passed. [attempt 2] Html Report (VSDrops) Download
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✅ sharpie: All 1 tests passed. Html Report (VSDrops) Download
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rolfbjarne requested a review from Copilot February 18, 2026 19:27

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Copilot started reviewing on behalf of rolfbjarne February 18, 2026 19:28 View session

rolfbjarne mentioned this pull request Feb 18, 2026

[CoreMidi] Implement some of the missing CoreMIDI APIs. #22459

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[CoreMidi] Fix MidiEventList cleanup cast.

9db33b7

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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	/// <summary>Add a new <see cref="MidiEventPacket" /> to this lis.</summary>
	/// <summary>Add a new <see cref="MidiEventPacket" /> to this list.</summary>

	/// <param name="source">The endpoint where the packates come from.</param>
	/// <param name="source">The endpoint where the packets come from.</param>

	static List<MidiDriver> strongReferences = new List<MidiDriver> ();
	static readonly List<MidiDriver> strongReferences = new List<MidiDriver> ();

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vs-mobiletools-engineering-service2 commented Feb 19, 2026

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vs-mobiletools-engineering-service2 commented Feb 19, 2026

✅ [CI Build #9db33b7] Build passed (Build macOS tests) ✅

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🔥 [CI Build #9db33b7] Test results 🔥

Test results

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❌ linker tests [attempt 2]

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❌ monotouch tests (iOS) [attempt 2]

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❌ monotouch tests (MacCatalyst) [attempt 2]

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