MIDI assembler/disassembler to convert between standard MIDI files and a text/JSON equivalent.
A Go reimplementation of Jeff Glatt's long defunct Windows-only MIDIASM (last seen archived at MIDI Technical Fanatic's Brainwashing Center). Because sometimes it's easier to just programmatically deal with text or JSON.
In development
| Version | Description |
|---|---|
| v0.1.0 | Initial release with support for dissassemble, export, notes, click and transpose |
Executables for all the supported operating systems are packaged in the releases. Installation is straightforward - download the archive and extract it to a directory of your choice.
midiasm help will list the available commands and associated options (documented below).
Required tools:
- Go 1.22+
- make (optional but recommended)
To build using the included Makefile:
git clone https://github.com/transcriptaze/midiasm.git
cd midiasm
make build
Without using make:
git clone https://github.com/transcriptaze/midiasm.git
cd midiasm
go build -trimpath -o bin/ ./...
The above commands build the midiasm executable to the bin directory.
None
Usage: midiasm <command> <options>
Supported commands:
Defaults to disassemble if the command is not provided.
Disassembles a MIDI file and displays the tracks in a human readable format.
Command line:
midiasm [--debug] [--verbose] [--C4] [--split] [--out <file>] <MIDI file>
--out <file> Writes the disassembly to a file. Default is to write to stdout.
--split Writes each track to a separate file. Default is `false`.
Options:
--C4 Uses C4 as middle C (Yamaha convention). Defaults to C3.
--debug Displays internal information while processing a MIDI file. Defaults to false
--verbose Enables 'verbose' logging. Defaults to false
Example:
midiasm --debug --verbose --out one-time.txt one-time.mid
Assembles a MIDI file from a text or JSON source.
Command line:
midiasm assemble [--debug] [--verbose] [--C4] [--out <MIDI file>] <file>
--out <file> Output MIDI file. Defaults to the input file with a .midi extension.
Options:
--C4 Uses C4 as middle C (Yamaha convention). Defaults to C3.
--debug Displays internal information while processing a MIDI file. Defaults to false
--verbose Enables 'verbose' logging. Defaults to false
Example:
midiasm assemble --debug --verbose --out one-time.mid one-time.json
Extracts the MIDI information as JSON for use with other tools (e.g. jq).
Command line:
midiasm export [--debug] [--verbose] [--C4] [--out <file>] <MIDI file>
--out <file> Writes the JSON to a file. Default is to write to stdout.
--json Formats the output as JSON - the default is human readable text.
--transpose <N> Transposes the notes up or down by N semitones.
Options:
--C4 Uses C4 as middle C (Yamaha convention). Defaults to C3.
--debug Displays internal information while processing a MIDI file. Defaults to false
--verbose Enables 'verbose' logging. Defaults to false
Example:
midiasm notes --debug --verbose --out one-time.json one-time.mid
Extracts the NoteOn and NoteOff events to generate a list of notes with start times and durations.
Command line:
midiasm notes [--debug] [--verbose] [--C4] [--out <file>] <MIDI file>
--out <file> Writes the notes to a file. Default is to write to stdout.
Options:
--C4 Uses C4 as middle C (Yamaha convention). Defaults to C3.
--debug Displays internal information while processing a MIDI file. Defaults to false
--verbose Enables 'verbose' logging. Defaults to false
Example:
midiasm notes --debug --verbose --out one-time.notes one-time.mid
Extracts the beats from the MIDI file in a format that can be used to create a click track.
Command line:
midiasm click [--debug] [--verbose] [--C4] [--out <file>] <MIDI file>
--out <file> Writes the click track to a file. Default is to write to stdout.
Options:
--C4 Uses C4 as middle C (Yamaha convention). Defaults to C3.
--debug Displays internal information while processing a MIDI file. Defaults to false
--verbose Enables 'verbose' logging. Defaults to false
Example:
midiasm click --debug --verbose --out one-time.click one-time.mid
Transposes the key of the notes (and key signature) and writes it back as MIDI file.
Command line:
midiasm transpose [--debug] [--verbose] [--C4] --semitones <steps> --out <file> <MIDI file>
--semitones <N> Number of semitones to transpose up or down. Defaults to 0.
--out <file> (required) Destination file for the transposed MIDI.
Options:
--C4 Uses C4 as middle C (Yamaha convention). Defaults to C3.
--debug Displays internal information while processing a MIDI file. Defaults to false
--verbose Enables 'verbose' logging. Defaults to false
Example:
midiasm transpose --debug --verbose --semitones +5 --out one-time+5.mid one-time.mid
Extracts the MIDI information as a TSV or fixed width file for use with other tools (e.g. miller)
Command line:
midiasm tsv [--debug] [--verbose] [--C4] [--out <file>] <MIDI file>
--out <file> Output filepath. Default is to write to stdout.
--delimiter Column delimiter for TSV files. Defaults to TAB.
--tabular Formats the outputs as fixed width columns
Options:
--C4 Uses C4 as middle C (Yamaha convention). Defaults to C3.
--debug Displays internal information while processing a MIDI file. Defaults to false
--verbose Enables 'verbose' logging. Defaults to false
Example:
midiasm tsv --debug --verbose --out one-time.tsv one-time.mid
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