A Python library inspired by the midicsv tool created by John Walker. Its main purpose is to bidirectionally convert between the binary MIDI format and a human-readable interpretation of the contained data in text format, expressed as CSV. If you found this library, you probably already know why you need it.
py_midicsv can be installed via pip:
$ pip install py_midicsv
Alternatively you can build the package by cloning this repository and installing via poetry:
$ git clone https://github.com/timwedde/py_midicsv.git $ cd py_midicsv/ $ poetry install
As a Command Line Tool
Usage: midicsv [OPTIONS] INPUT_FILE OUTPUT_FILE Convert MIDI files to CSV files. midicsv reads a standard MIDI file and decodes it into a CSV file which preserves all the information in the MIDI file. The ASCII CSV file may be loaded into a spreadsheet or database application, or processed by a program to transform the MIDI data (for example, to key transpose a composition or extract a track from a multi-track sequence). A CSV file in the format created by midicsv may be converted back into a standard MIDI file with the csvmidi program. Specify an input file and an output file to process it. Either argument can be stdin/stdout. Options: --help Show this message and exit.
Usage: csvmidi [OPTIONS] INPUT_FILE OUTPUT_FILE Convert CSV files to MIDI files. csvmidi reads a CSV file in the format written by midicsv and creates the equivalent standard MIDI file. Specify an input file and an output file to process it. Either argument can be stdin/stdout. Options: --help Show this message and exit.
As a Library
import py_midicsv as pm # Load the MIDI file and parse it into CSV format csv_string = pm.midi_to_csv("example.mid") with open("example_converted.csv", "w") as f: f.writelines(csv_string) # Parse the CSV output of the previous command back into a MIDI file midi_object = pm.csv_to_midi(csv_string) # Save the parsed MIDI file to disk with open("example_converted.mid", "wb") as output_file: midi_writer = pm.FileWriter(output_file) midi_writer.write(midi_object)
A full explanation of the
midicsv file format can be found here.
This library adheres as much as possible to how the original library works, however generated files are not guaranteed to be entirely identical when compared bit-by-bit.
This is mostly due to the handling of meta-event data, especially lyric events, since the encoding scheme has changed. The original library did not encode some of the characters in the Latin-1 set, while this version does.