#!/usr/bin/env python3

from sys import argv
from re import compile, search

records = []

with open(argv[1], 'r') as f:
    record = []
    for line in f.readlines():
        l = line.strip()
        if len(l) == 0:
            records.append(record)
            record = []
        else:
            record.append(l)

# Timestamp format: 120.239372
expr = compile('\d+\.\d{6}')

prev = -1
for record in records:
    for bt in record[1:]:
        if bt.find('snd_pcm_period_elapsed') > 0:
            matches = search(expr, record[0])
            tstamp = float(matches.group(0))
            if prev > 0:
                gap = tstamp - prev
                if gap < 0.02 or gap > 0.03:
                    res = 'unexpected'
                else:
                    res = 'expected'
                print('{:0.4f} {:0.8f} {}'.format(tstamp, gap, res))
            prev = tstamp