midijssf-from-sf2-pmb

Utilities for converting .sf2 wavetables to MIDI.js sound font format.

The space and lowercase "f" in "sound font(s)" is my attempt to help you discern them from the brand name.

Usage

See the midijssf-timgm6mb-pmb package for how to use this one.

Some hints:

• Beware that mono music usually won't survive the naive karaoke approach (sox: oops effect). If you try to save bytes this way, really compare the cost for each selected output format. Occasionally I have been surprised by how small a difference it made.

How it works

• For each selected instrument (including percussion) and each MIDI note:
  • Make a MIDI file playing that note on that instrument.
    • If things work out, this is done only once when the package is installed, by running the input-files.gen-all.js script.
  • Let fluidsynth convert the MIDI to FLAC audio, using the configured .sf2 wavetable.
    • WAV or AU seemed more efficient but caused problems with the plumbing.
  • Let sox convert the FLAC to WAV, and optionally trim trailing silence in the process.
  • Encode the samples to selected output formats (e.g. Vorbis, MP3) and compile them into bundles (MIDI.js sound font and/or Compact JSON WaveTable).

Template variables

Some options support variable. Their notation is \v (U+000B line tabulation) followed by a single letter:

• d: config.destDir
• B: config.sf2basename
• b: config.sf2basename.toLowerCase()
• F: current output audio format ID
  • f: same but in lowercase
• i: current instrument ID (001…128, or -10 for percussion)
• I: current instrument name (or config.chn10Name for percussion)
  • s: same but in snake_case

Known issues

• needs more/better tests and docs

License

ISC