midi: a simple lua module for midi on Windows

how to build

msvc

git clone -v --recursive https://github.com/fxliang/midi.git
cd midi
xmake f -p windows
xmake 

mingw

git clone -v --recursive https://github.com/fxliang/midi.git
cd midi
xmake f -p mingw
xmake 

API in lua

example code to run with lua.exe

-- for windows only
-- current directory of script
local script_dir = debug.getinfo(1, "S").source:match("@(.*[/\\])")
-- add DLL in cwd to package.cpath
package.cpath = package.cpath .. ";" .. script_dir .. "?.dll"

print(package.cpath)
local midi = require("midi")
-- print(midi)  -- check if midi is loaded

local function sleep(n)
  os.execute("sleep " .. tonumber(n))
end

midi.init()
midi.playNoteOn(42, 0x7f)
sleep(1)
midi.playNoteOff(42)
midi.fini()

how to play with librime on Windows

• copy midi.dll and play.lua to <path-to-user-data-dir>\lua\
• patch your schema, add - lua_processor@*play to engine/processors.
• deploy and enjoy.

how to generate notes data file(lua) from a midi file

install dependences

pip install argparser
pip install mido
pip install pygame

use python script to get data file

python.exe .\get_notes.py -h
pygame 2.6.1 (SDL 2.28.4, Python 3.9.0)
Hello from the pygame community. https://www.pygame.org/contribute.html
usage:
get track notes data to a lua file [-h] [--input INPUT] [--output OUTPUT] [--track TRACK] [--play PLAY]

optional arguments:
  -h, --help       show this help message and exit
  --input INPUT    str, input midi file
  --output OUTPUT  str, output data file
  --track TRACK    int, track index
  --play PLAY      bool, if to play a track

Credits

lua (MIT License)