def get_date(dgram, start_index):
"""Get a 64-bit big-endian fixed-point time tag as a date from the datagram.
According to the specifications, a date is represented as is:
"the first 32 bits specify the number of seconds since midnight on
January 1, 1900, and the last 32 bits specify fractional parts of a second
to a precision of about 200 picoseconds".
Args:
dgram: A datagram packet.
start_index: An index where the date starts in the datagram.
Returns:
A tuple containing the system date and the new end index.
returns osc_immediately (0) if the corresponding OSC sequence was found.
Raises:
ParseError if the datagram could not be parsed.
"""
# Check for the special case first.
if dgram[start_index:start_index + _DATE_DGRAM_LEN] == ntp.IMMEDIATELY:
return IMMEDIATELY, start_index + _DATE_DGRAM_LEN
if len(dgram[start_index:]) < _DATE_DGRAM_LEN:
raise ParseError('Datagram is too short')
num_secs, start_index = get_int(dgram, start_index)
fraction, start_index = get_int(dgram, start_index)
# Sum seconds and fraction of second:
system_time = num_secs + (fraction / ntp.FRACTIONAL_CONVERSION)
print(ntp.ntp_to_system_time(system_time))
return ntp.ntp_to_system_time(system_time), start_index
def get_date(dgram, start_index):
"""Get a 64-bit big-endian fixed-point time tag as a date from the datagram.
According to the specifications, a date is represented as is:
"the first 32 bits specify the number of seconds since midnight on
January 1, 1900, and the last 32 bits specify fractional parts of a second
to a precision of about 200 picoseconds".
Args:
dgram: A datagram packet.
start_index: An index where the date starts in the datagram.
Returns:
A tuple containing the system date and the new end index.
returns osc_immediately (0) if the corresponding OSC sequence was found.
Raises:
ParseError if the datagram could not be parsed.
"""
# Check for the special case first.
if dgram[start_index:start_index + _DATE_DGRAM_LEN] == ntp.IMMEDIATELY:
return IMMEDIATELY, start_index + _DATE_DGRAM_LEN
if len(dgram[start_index:]) < _DATE_DGRAM_LEN:
raise ParseError('Datagram is too short')
num_secs, start_index = get_int(dgram, start_index)
fraction, start_index = get_int(dgram, start_index)
# Get a decimal representation from those two values.
dec = decimal.Decimal(str(num_secs) + '.' + str(fraction))
# And convert it to float simply.
system_time = float(dec)
return ntp.ntp_to_system_time(system_time), start_index
def get_date(dgram: bytes, start_index: int) -> Tuple[Union[int, float], int]:
"""Get a 64-bit big-endian fixed-point time tag as a date from the datagram.
According to the specifications, a date is represented as is:
"the first 32 bits specify the number of seconds since midnight on
January 1, 1900, and the last 32 bits specify fractional parts of a second
to a precision of about 200 picoseconds".
Args:
dgram: A datagram packet.
start_index: An index where the date starts in the datagram.
Returns:
A tuple containing the system date and the new end index.
returns osc_immediately (0) if the corresponding OSC sequence was found.
Raises:
ParseError if the datagram could not be parsed.
"""
# Check for the special case first.
if dgram[start_index:start_index + _DATE_DGRAM_LEN] == ntp.IMMEDIATELY:
return IMMEDIATELY, start_index + _DATE_DGRAM_LEN
if len(dgram[start_index:]) < _DATE_DGRAM_LEN:
raise ParseError('Datagram is too short')
num_secs, start_index = get_int(dgram, start_index)
fraction, start_index = get_int(dgram, start_index)
# Sum seconds and fraction of second:
system_time = num_secs + (fraction / ntp.FRACTIONAL_CONVERSION)
return ntp.ntp_to_system_time(system_time), start_index
def test_nto_to_system_time(self):
unix_time = time.time()
timestamp = ntp.system_time_to_ntp(unix_time)
unix_time2 = ntp.ntp_to_system_time(timestamp)
self.assertTrue(type(unix_time) is float)
self.assertTrue(type(timestamp) is bytes)
self.assertTrue(type(unix_time2) is float)
self.assertEqual(round(unix_time, 6), round(unix_time2, 6))
def test_nto_to_system_time(self): self.assertGreater(0, ntp.ntp_to_system_time(0))
