def __init__(self, stream_data_path, timing_data_path):
self.input_file = open(stream_data_path, "rb")
timing_csv_iterator = csv.reader(open(timing_data_path))
self.timings = collections.deque((float(timestamp_str), int(byte_count_str))
for timestamp_str, byte_count_str
in timing_csv_iterator)
start_time = zephyr.time()
first_timestamp = float(self.timings[0][0])
self.timestamp_correction = start_time - first_timestamp
def __init__(self, stream_data_path, timing_data_path):
self.input_file = open(stream_data_path, "rb")
timing_csv_iterator = csv.reader(open(timing_data_path))
self.timings = collections.deque(
(float(timestamp_str), int(byte_count_str))
for timestamp_str, byte_count_str in timing_csv_iterator)
start_time = zephyr.time()
first_timestamp = float(self.timings[0][0])
self.timestamp_correction = start_time - first_timestamp
def estimate_and_correct_timestamp(self, timestamp, key):
if DISABLE_CLOCK_DIFFERENCE_ESTIMATION:
return timestamp
instantaneous_zephyr_clock_ahead = timestamp - zephyr.time()
self._clock_difference_deques[key].append(instantaneous_zephyr_clock_ahead)
clock_ahead_values = self._clock_difference_deques[key]
zephyr_clock_ahead_estimate = sum(clock_ahead_values) / float(len(clock_ahead_values))
corrected_timestamp = timestamp - zephyr_clock_ahead_estimate
return corrected_timestamp
def cleanup_if_needed(self):
now = zephyr.time()
if self.last_cleanup_time < now - 5.0:
history_limit = now - self.history_length_seconds
for signal_stream_history in self._signal_stream_histories.values():
signal_stream_history.clean_up_samples_before(history_limit)
for event_stream in self._event_streams.values():
event_stream.clean_up_events_before(history_limit)
self.last_cleanup_time = now
def cleanup_if_needed(self):
now = zephyr.time()
if self.last_cleanup_time < now - 5.0:
history_limit = now - self.history_length_seconds
for signal_stream_history in self._signal_stream_histories.values():
signal_stream_history.clean_up_samples_before(history_limit)
for event_stream in self._event_streams.values():
event_stream.clean_up_events_before(history_limit)
self.last_cleanup_time = now
def run(self):
while not self.terminate_requested:
now = zephyr.time()
all_streams = itertools.chain(self.signal_collector.iterate_signal_stream_histories(),
self.signal_collector.iterate_event_streams())
for signal_stream_name, signal_stream_history in all_streams:
delay = self.specific_delays.get(signal_stream_name, self.default_delay)
delayed_current_time = now - delay
from_sample = self.stream_output_positions[signal_stream_name]
for sample in signal_stream_history.iterate_samples(from_sample, delayed_current_time):
self.stream_output_positions[signal_stream_name] += 1
for callback in self.callbacks:
callback(signal_stream_name, sample)
time.sleep(0.01)
def read_byte(self):
if len(self.timings) == 0:
raise EOFError("End of file reached")
chunk_timestamp_string, chunk_cumulative_byte_count_string = self.timings[0]
chunk_timestamp = float(chunk_timestamp_string) + self.timestamp_correction
chunk_cumulative_byte_count = int(chunk_cumulative_byte_count_string)
time_to_chunk_timestamp = chunk_timestamp - zephyr.time()
if time_to_chunk_timestamp > 0:
zephyr.sleep(time_to_chunk_timestamp)
output_byte = self.input_file.read(1)
position = self.input_file.tell()
if position >= chunk_cumulative_byte_count:
self.timings.popleft()
return output_byte
def run(self):
while not self.terminate_requested:
now = zephyr.time()
all_streams = itertools.chain(self.signal_collector.iterate_signal_stream_histories(),
self.signal_collector.iterate_event_streams())
for signal_stream_name, signal_stream_history in all_streams:
delay = self.specific_delays.get(signal_stream_name, self.default_delay)
delayed_current_time = now - delay
from_sample = self.stream_output_positions[signal_stream_name]
for sample in signal_stream_history.iterate_samples(from_sample, delayed_current_time):
self.stream_output_positions[signal_stream_name] += 1
for callback in self.callbacks:
callback(signal_stream_name, sample)
time.sleep(0.01)
def read_byte(self):
if len(self.timings) == 0:
raise EOFError("End of file reached")
chunk_timestamp_string, chunk_cumulative_byte_count_string = self.timings[
0]
chunk_timestamp = float(
chunk_timestamp_string) + self.timestamp_correction
chunk_cumulative_byte_count = int(chunk_cumulative_byte_count_string)
time_to_chunk_timestamp = chunk_timestamp - zephyr.time()
if time_to_chunk_timestamp > 0:
zephyr.sleep(time_to_chunk_timestamp)
output_byte = self.input_file.read(1)
position = self.input_file.tell()
if position >= chunk_cumulative_byte_count:
self.timings.popleft()
return output_byte
