MIDI CSV Data

6月 29, 2024 admin44 No Comments

前回のDeep Learning のようなことをやりたい場合、データが必要になります。
MIDIデバイスをつかったデータ生成->CSVファイル書き込み、およびその逆を試してみました。

環境）Anaconda / Windows 11
MIDI to CSV file

import rtmidi
import csv
import time

def midi_to_csv_from_interface(midi_port_name, csv_file_path):
    midi_in = rtmidi.MidiIn()
    available_ports = midi_in.get_ports()

    if midi_port_name not in available_ports:
        raise ValueError(f"MIDI port {midi_port_name} not found. Available ports: {available_ports}")

    midi_in.open_port(available_ports.index(midi_port_name))

    with open(csv_file_path, mode='w', newline='') as csv_file:
        csv_writer = csv.writer(csv_file)
        csv_writer.writerow(['Timestamp', 'Type', 'Channel', 'Note', 'Velocity', 'Control', 'Value'])

        print(f"Listening on {midi_port_name}... Press Ctrl+C to stop.")
        start_time = time.time()

        try:
            while True:
                msg = midi_in.get_message()
                if msg:
                    message, delta_time = msg
                    timestamp = time.time() - start_time
                    status = message[0]
                    data1 = message[1] if len(message) > 1 else 0
                    data2 = message[2] if len(message) > 2 else 0

                    if 0x80 <= status < 0x90:  # Note Off
                        csv_writer.writerow([timestamp, 'note_off', status & 0x0F, data1, data2, '', ''])
                    elif 0x90 <= status < 0xA0:  # Note On
                        csv_writer.writerow([timestamp, 'note_on', status & 0x0F, data1, data2, '', ''])
                    elif 0xB0 <= status < 0xC0:  # Control Change
                        csv_writer.writerow([timestamp, 'control_change', status & 0x0F, '', '', data1, data2])
                    
                    csv_file.flush()
        except KeyboardInterrupt:
            print("Stopped by user")
        finally:
            midi_in.close_port()

print("Available MIDI input ports:")
midi_in = rtmidi.MidiIn()
available_ports = midi_in.get_ports()
for port in available_ports:
    print(port)

midi_port_name = input("Enter the MIDI port name to listen to: ")
csv_file_path = 'output.csv'

midi_to_csv_from_interface(midi_port_name, csv_file_path)

import rtmidi

import csv

import time

def midi_to_csv_from_interface(midi_port_name, csv_file_path):

midi_in = rtmidi.MidiIn()

available_ports = midi_in.get_ports()

if midi_port_name not in available_ports:

raise ValueError(f"MIDI port {midi_port_name} not found. Available ports: {available_ports}")

midi_in.open_port(available_ports.index(midi_port_name))

with open(csv_file_path, mode='w', newline='') as csv_file:

csv_writer = csv.writer(csv_file)

csv_writer.writerow(['Timestamp', 'Type', 'Channel', 'Note', 'Velocity', 'Control', 'Value'])

print(f"Listening on {midi_port_name}... Press Ctrl+C to stop.")

start_time = time.time()

try:

while True:

msg = midi_in.get_message()

if msg:

message, delta_time = msg

timestamp = time.time() - start_time

status = message[0]

data1 = message[1] if len(message) > 1 else 0

data2 = message[2] if len(message) > 2 else 0

if 0x80 <= status < 0x90: # Note Off

csv_writer.writerow([timestamp, 'note_off', status & 0x0F, data1, data2, '', ''])

elif 0x90 <= status < 0xA0: # Note On

csv_writer.writerow([timestamp, 'note_on', status & 0x0F, data1, data2, '', ''])

elif 0xB0 <= status < 0xC0: # Control Change

csv_writer.writerow([timestamp, 'control_change', status & 0x0F, '', '', data1, data2])

csv_file.flush()

except KeyboardInterrupt:

print("Stopped by user")

finally:

midi_in.close_port()

print("Available MIDI input ports:")

midi_in = rtmidi.MidiIn()

available_ports = midi_in.get_ports()

for port in available_ports:

print(port)

midi_port_name = input("Enter the MIDI port name to listen to: ")

csv_file_path = 'output.csv'

midi_to_csv_from_interface(midi_port_name, csv_file_path)

CSV file TO MIDI

import rtmidi
import csv
import time

def csv_to_midi_interface(csv_file_path, midi_port_name):
    midi_out = rtmidi.MidiOut()
    available_ports = midi_out.get_ports()

    if midi_port_name not in available_ports:
        raise ValueError(f"MIDI port {midi_port_name} not found. Available ports: {available_ports}")

    midi_out.open_port(available_ports.index(midi_port_name))

    with open(csv_file_path, mode='r') as csv_file:
        csv_reader = csv.reader(csv_file)
        header = next(csv_reader)
        
        start_time = time.time()

        for row in csv_reader:
            timestamp = float(row[0])
            msg_type = row[1]
            channel = int(row[2]) if row[2] else 0
            note = int(row[3]) if row[3] else 0
            velocity = int(row[4]) if row[4] else 0
            control = int(row[5]) if row[5] else 0
            value = int(row[6]) if row[6] else 0

            current_time = time.time() - start_time
            if timestamp > current_time:
                time.sleep(timestamp - current_time)
            
            if msg_type == 'note_on':
                message = [0x90 | channel, note, velocity]
            elif msg_type == 'note_off':
                message = [0x80 | channel, note, velocity]
            elif msg_type == 'control_change':
                message = [0xB0 | channel, control, value]
            else:
                continue

            midi_out.send_message(message)
            print(f"Sent: {message}")

    midi_out.close_port()

print("Available MIDI output ports:")
midi_out = rtmidi.MidiOut()
available_ports = midi_out.get_ports()
for port in available_ports:
    print(port)

midi_port_name = input("Enter the MIDI port name to send to: ")
csv_file_path = 'output.csv'

csv_to_midi_interface(csv_file_path, midi_port_name)

import rtmidi

import csv

import time

def csv_to_midi_interface(csv_file_path, midi_port_name):

midi_out = rtmidi.MidiOut()

available_ports = midi_out.get_ports()

if midi_port_name not in available_ports:

raise ValueError(f"MIDI port {midi_port_name} not found. Available ports: {available_ports}")

midi_out.open_port(available_ports.index(midi_port_name))

with open(csv_file_path, mode='r') as csv_file:

csv_reader = csv.reader(csv_file)

header = next(csv_reader)

start_time = time.time()

for row in csv_reader:

timestamp = float(row[0])

msg_type = row[1]

channel = int(row[2]) if row[2] else 0

note = int(row[3]) if row[3] else 0

velocity = int(row[4]) if row[4] else 0

control = int(row[5]) if row[5] else 0

value = int(row[6]) if row[6] else 0

current_time = time.time() - start_time

if timestamp > current_time:

time.sleep(timestamp - current_time)

if msg_type == 'note_on':

message = [0x90 | channel, note, velocity]

elif msg_type == 'note_off':

message = [0x80 | channel, note, velocity]

elif msg_type == 'control_change':

message = [0xB0 | channel, control, value]

else:

continue

midi_out.send_message(message)

print(f"Sent: {message}")

midi_out.close_port()

print("Available MIDI output ports:")

midi_out = rtmidi.MidiOut()

available_ports = midi_out.get_ports()

for port in available_ports:

print(port)

midi_port_name = input("Enter the MIDI port name to send to: ")

csv_file_path = 'output.csv'

csv_to_midi_interface(csv_file_path, midi_port_name)

使用デバイス(Roland S-1。MIDIのIN/OUTはつなぎなおし。PCとはRoland UM-ONE)

操作）
デバイスのフィルタとレゾナンスのつまみをいじってMIDI出力。
キーボードも適当にならす。
つなぎ変えて次はMIDI受信。
先ほどの操作がそのまま復元されることを確認。

下記、CSVファイルをエクセルで編集してフィルタとレゾナンスのコントロールチェンジを可視化した。

今回のコードは、ChatGPTで作成しました。何も修正せずそのまま動きました。
コーディングの生産性はかなり高くなりますね。
コード生成の指示を正確にするためにも、コーディング技術はある程度必要です。

Category: AM