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项目作者： jimd1989

项目描述 ：
convert MIDI to boar commands
高级语言： C
项目地址: git://github.com/jimd1989/boar-midi.git
创建时间： 2020-05-24T04:12:13Z
项目社区：https://github.com/jimd1989/boar-midi
开源协议：
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boar-midi

Convert MIDI on/off messages to boar commands, or vice/versa.

Build

  1. cc boar-midi.c -lsndio -o boar-midi
  2. cc midi-boar.c -lsndio -o midi-boar

Requires sndio, which comes installed by default on OpenBSD. Nothing else is supported.

Usage

MIDI → Boar

To read MIDI data from a port into a boar instance, run

  1. midi-boar <-c n|-delay n> | boar

The program will listen to all channels at midi/0 by default. Set MIDIDEVICE environment variable to read from something else.

Input will always go to stdout. Redirect using standard Unix conventions.

Will read from all 16 MIDI channels by default. To filter for a specific channel, use the -c n argument, where n is the channel number. Run multiple instances of midi-boar to read from multiple specific channels; sndio’s handling of the MIDI port is efficient enough to support many readers.

Some MIDI sequencers send an off signal at the same time as their on signal. If the instrument further down the pipe is having trouble with this, you can delay the printing of an off signal for n microseconds with the -delay n flag.

Devices that send lots of MIDI data, such as a Linnstrument, can overwhelm this program and lead to skipped notes. I haven’t figured out if this is a flaw with my underpowered PC, sndio itself, or the code I’ve written. Turn off X/Y/Z axis transmission on the Linnstrument to fix this, since boar has no use for it anyway.

Boar → MIDI

While midi-boar has been extensively refactored to be more efficient and composable, this program hasn’t. Its commands and internals are subject to change pending the author’s level of motivation.

To use the n and o commands from boar as MIDI on and off events respectively, run

  1. boar -echo-notes | boar-midi <MIDI channel> <MIDI port (optional)>

The program will write to midi/0 if a port is not specified. Velocity is ignored for now. On/off events are newline delimited exclusively, like

  1. n 60
  2. n 63
  3. n 67

I suspect that there are some edge cases where the parser will fail, but it’s unlikely that the input will be hand-written. It should read from boar -echo-notes fine.

See the boar-extras package for additional helper scripts.

Caveats

  • Other MIDI instructions are completely ignored.