| Namespace | Windows.Devices.Midi2.Transports.Rtp |
|---|---|
| Type Name | MidiRtpSendSpeedLimit |
| Type | WinRT Enumeration (a 32-bit unsigned or signed integer) |
| IDL | MidiRtpSendSpeedLimitEnum.idl |
Used by SendSpeedLimit on MidiRtpHostCreationConfig, MidiRtpClientConnectConfig and MidiRtpRemoteClientSettings. Reported by MidiRtpConfiguredHost, MidiRtpConfiguredClient, MidiRtpConnection, MidiRtpSavedHost and MidiRtpSavedClient.
MIDI 1.0 wire speed is the speed of a MIDI 1.0 DIN cable: 31,250 bits a second, which is 3,125 bytes a second. At Midi1WireSpeed, a SysEx dump takes about as long as it would over a DIN cable. This is the same setting other RTP-MIDI software calls a MIDI DIN speed limit.
| Value | Numeric Value | Description |
|---|---|---|
Unlimited |
0 |
No limit. Messages are sent as fast as they arrive. This is the default |
Midi1WireSpeed |
1 |
MIDI 1.0 wire speed |
Midi1WireSpeedTimes2 |
2 |
Twice MIDI 1.0 wire speed |
Midi1WireSpeedTimes4 |
4 |
4 times MIDI 1.0 wire speed |
Midi1WireSpeedTimes8 |
8 |
8 times MIDI 1.0 wire speed |
Midi1WireSpeedTimes16 |
16 |
16 times MIDI 1.0 wire speed |
Midi1WireSpeedTimes32 |
32 |
32 times MIDI 1.0 wire speed, about 1 megabit a second |
Choose a limit for a device that loses data when a lot of it arrives at once, like a hardware synth taking a long SysEx dump, or a network to DIN bridge with a small buffer.
A limit never delays a lone message. After a quiet moment, a short burst goes out straight away: up to 64 bytes at Midi1WireSpeed, and 64 bytes more for each step up. Only the data after that is spaced out. So a single note or a knob turn is sent the moment it arrives, at any limit.
When more than about a tenth of a second of messages is waiting behind a limit, some of the steps in the middle of each control change, pressure or pitch bend move are skipped so the device catches up. Where each move starts, turns and ends always goes, and so does every other kind of message. See Choosing a sending speed.
When an app sends faster than the limit, Windows holds the extra messages and sends them as fast as the limit allows. An app that keeps sending faster than that is slowed down to match, instead of having messages dropped.
A new limit applies straight away, including to connections that are already up, and doesn’t disconnect anything.
RTP-MIDI can’t tell this PC that a device missed data, so unlike Network MIDI 2.0 there’s no option to slow down by itself. Choose the speed the device needs.
Windows MIDI Services is an open source project with all source available on GitHub. We have a great community on Discord as well. Between GitHub and Discord, you should find the information you are looking for.
