MidiConvertWrapperAdvanced

The intention in this project is to make a simple file processor that turns midi files into JSON files that can be streamed in real time by python / c++, caressed in real-time to inputs and labels for my model.

Some useful commands:

• npm run start - webpacks the money file to build/ and watches for changes in src/
• npm run build - basically the same as above but doesn't watch for changes
• npm run test - runs all linting and tests once
• npm run test:dev - runs only the tests but in watch mode

To use, cd into build/ directory and call like this:

node MidiConvertWrapperAdvanced.js /path/to/midi/file.mid /path/to/desired/json/output.json 1024 44100

The 4 required arguments are:

1. midi input file path
2. json output file path
3. buffer size
4. sampling rate

The json generated looks like this:

{
  "104448": [
    {
      "pianoNoteNum": 27,
      "velocity": 0.77952755905512,
      "sampleStartIndex": 9949,
      "sampleEndIndex": 10973,
      "offsetStartIndex": 0
    }
  ],
  "105472": [
    {
      "pianoNoteNum": 27,
      "velocity": 0.77952755905512,
      "sampleStartIndex": 10973,
      "sampleEndIndex": 11997,
      "offsetStartIndex": 0
    }
  ],
  "106496": [
    {
      "pianoNoteNum": 27,
      "velocity": 0.77952755905512,
      "sampleStartIndex": 11997,
      "sampleEndIndex": 13021,
      "offsetStartIndex": 0
    },
    {
      "pianoNoteNum": 31,
      "velocity": 0.47244094488189,
      "sampleStartIndex": 0,
      "sampleEndIndex": 106,
      "offsetStartIndex": 918
    },
    {
      "pianoNoteNum": 18,
      "velocity": 0.78740157480315,
      "sampleStartIndex": 0,
      "sampleEndIndex": 106,
      "offsetStartIndex": 918
    }
  ],
  "107520": [
    {
      "pianoNoteNum": 27,
      "velocity": 0.77952755905512,
      "sampleStartIndex": 13021,
      "sampleEndIndex": 14045,
      "offsetStartIndex": 0
    },
    {
      "pianoNoteNum": 31,
      "velocity": 0.47244094488189,
      "sampleStartIndex": 106,
      "sampleEndIndex": 1130,
      "offsetStartIndex": 0
    },
    {
      "pianoNoteNum": 18,
      "velocity": 0.78740157480315,
      "sampleStartIndex": 106,
      "sampleEndIndex": 1130,
      "offsetStartIndex": 0
    }
  ]
}

The key is the buffer and the value is the array of events.

Eventually delete:

"jsmidgen": "^0.1.5",
"midi-file-parser": "^1.0.0",

on resolution of this issue: Tonejs/Midi#44

#TODO

• handle files with spaces in them (change to dashes or something)