audiater.py

audiater.py

#!/usr/bin/env python
import sys
import mido
import time
import random
import hashlib

# pip install mido rtmidi
# Enable a virtual MIDI bus: https://help.ableton.com/hc/en-us/articles/209774225-Using-virtual-MIDI-buses
# tail -f somelog | ./audiater.py

# Major: A, C, D, E, G
maj_pentatonic = [57, 60, 62, 64, 67]

sleeps = [0, 0.5, 1, 2]

scale = maj_pentatonic

outport = mido.open_output("IAC Driver Bus 1")

for line in sys.stdin:
    # Map a line to a note
    note = int(hashlib.md5(line.rstrip().encode('utf-8')).hexdigest(), 16) % 5

    # Send the occasional "bass" note to channel 1
    if random.randint(0, 99) < 12:
        channel = 1
        length = random.randint(3, 9)
        velocity = random.randint(90, 100)
    else:
        channel = 0
        length = random.randint(1, 3)
        velocity = random.randint(50, 100)
    msg = mido.Message(
        'note_on',
        note=scale[note-1],
        velocity=velocity,
        time=length,
        channel=channel
    )
    outport.send(msg)
    print('{0}\r'.format(msg))