from datetime import datetime, timedelta
import subprocess

KBITS = 128


def generate_test_file(fn, delta):
    subprocess.call(['ffmpeg',
                     '-f', 'lavfi',
                     '-i', 'sine=frequency=1000:duration=%d' % delta.total_seconds(),
                     '-b:a', '%dk' % KBITS,
                     fn])


start = datetime.now().replace(minute=0, second=0) - timedelta(hours=3)
end = start + timedelta(hours=6)
delta = timedelta(hours=1)

t = start
while t < end:
    fn = 'tmp/qfhi-{:04d}{:02d}{:02d}-{:02d}{:02d}.mp3'.format(
            t.year, t.month, t.day, t.hour, t.minute)
    print(fn)
    generate_test_file(fn, delta)

    t += delta