Convert Basic Pitch CSV into MIDI with MIDIUtil

csvtosheets.py

# unsuccessful attempt to convert the basic pitch csv into sheet music. Difficult because converting seconds to beats is difficult

from midiutil.MidiFile import MIDIFile
from csv import reader
import sys

hard_coded_start_time = 1.184217687


def csv_to_midi(csv_path, output_path):
    bpm = 72  # bpm

    mf = MIDIFile(2)
    track = 0
    midi_time = 0
    mf.addTrackName(track, midi_time, "Track 1")
    mf.addTempo(track, midi_time, bpm)
    channel = 0
    with open(csv_path, 'r') as read_obj:
        csv_reader = reader(read_obj)
        header = next(csv_reader)  # skip header
        last_was_blank = False
        if header is not None:
            for row in csv_reader:
                if len(row) == 0:
                    if last_was_blank:  # if two blanks in a row, stop
                        break
                    last_was_blank = True
                    continue  # skip blank rows
                last_was_blank = False
                start_time, end_time, pitch, velocity = row[0:4]
                start_time_beats = bpm/60 * (float(start_time) - hard_coded_start_time)
                end_time_beats = bpm/60 * (float(end_time)- hard_coded_start_time)
                pitch = int(pitch)
                velocity = int(velocity)
                duration_beats = end_time_beats-start_time_beats
                mf.addNote(track, channel, pitch, start_time_beats, duration_beats, velocity)
    with open(output_path, 'wb') as outfile:
        mf.writeFile(outfile)


if __name__ == "__main__":
    assert len(sys.argv) == 3
    csv_to_midi(sys.argv[1], sys.argv[2])