63 lines
1.6 KiB
Python
63 lines
1.6 KiB
Python
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# -*- coding: utf-8 -*-
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#
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# uosc/common.py
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#
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"""OSC message parsing and building functions."""
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try:
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from time import time
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except ImportError:
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from utime import time
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# UNIX_EPOCH = datetime.date(*time.gmtime(0)[0:3])
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# NTP_EPOCH = datetime.date(1900, 1, 1)
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# NTP_DELTA = (UNIX_EPOCH - NTP_EPOCH).days * 24 * 3600
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NTP_DELTA = 2208988800
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ISIZE = 4294967296 # 2**32
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class Impulse:
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pass
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class Bundle:
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"""Container for an OSC bundle."""
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def __init__(self, *items):
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"""Create bundle from given OSC timetag and messages/sub-bundles.
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An OSC timetag can be given as the first positional argument, and must
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be an int or float of seconds since the NTP epoch (1990-01-01 00:00).
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It defaults to the current time.
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Pass in messages or bundles via positional arguments as binary data
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(bytes as returned by ``create_message`` resp. ``Bundle.pack``) or as
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``Bundle`` instances or (address, *args) tuples.
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"""
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if items and isinstance(items[0], (int, float)):
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self.timetag = items[0]
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items = items[1:]
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else:
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self.timetag = time() + NTP_DELTA
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self._items = list(items)
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def add(self, *items):
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self._items.extend(list(items))
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def __iter__(self):
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return iter(self._items)
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def to_frac(t):
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"""Return seconds and fractional part of NTP timestamp as 2-item tuple."""
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sec = int(t)
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return sec, int(abs(t - sec) * ISIZE)
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def to_time(sec, frac):
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"""Return NTP timestamp from integer seconds and fractional part."""
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return sec + float(frac) / ISIZE
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