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"""Handle network connection to Pupil Labs devices. Tested with Pupil Invisible.
Based on Pupil Labs' Realtime Python API.
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
"""
__author__ = "Damien Mouratille"
__credits__ = []
__copyright__ = "Copyright 2024, Ecole Nationale de l'Aviation Civile (ENAC)"
__license__ = "GPLv3"
import sys
import logging
import time
import threading
from dataclasses import dataclass
from argaze import ArFeatures, DataFeatures, GazeFeatures
from argaze.utils import UtilsFeatures
import numpy
import cv2
from pupil_labs.realtime_api.simple import discover_one_device
class LiveStream(ArFeatures.ArContext):
@DataFeatures.PipelineStepInit
def __init__(self, **kwargs):
# Init ArContext class
super().__init__()
def __enter__(self):
logging.info('Pupil-Labs Device connexion starts...')
# Init timestamp
self.__start_time = time.time()
# Look for devices. Returns as soon as it has found the first device.
self.__device = discover_one_device(max_search_duration_seconds=10)
if self.__device is None:
logging.info('No device found. Exit!')
raise SystemExit(-1)
else:
logging.info('Device found. Stream loading.')
# Open gaze stream
self.__gaze_thread = threading.Thread(target=self.__stream_gaze)
logging.debug('> starting gaze thread...')
self.__gaze_thread.start()
# Open video stream
self.__video_thread = threading.Thread(target=self.__stream_video)
logging.debug('> starting video thread...')
self.__video_thread.start()
return self
def __stream_gaze(self):
"""Stream gaze."""
logging.debug('Stream gaze from Pupil Device')
while not self._stop_event.is_set():
try:
while True:
gaze = self.__device.receive_gaze_datum()
gaze_timestamp = int((gaze.timestamp_unix_seconds - self.__start_time) * 1e3)
logging.debug('Gaze received at %i timestamp', gaze_timestamp)
# When gaze position is valid
if gaze.worn is True:
self._process_gaze_position(
timestamp=gaze_timestamp,
x=int(gaze.x),
y=int(gaze.y))
else:
# Process empty gaze position
logging.debug('Not worn at %i timestamp', gaze_timestamp)
self._process_gaze_position(timestamp=gaze_timestamp)
except KeyboardInterrupt:
pass
def __stream_video(self):
"""Stream video."""
logging.debug('Stream video from Pupil Device')
while not self._stop_event.is_set():
try:
while True:
scene_frame, frame_datetime = self.__device.receive_scene_video_frame()
scene_timestamp = int((frame_datetime - self.__start_time) * 1e3)
logging.debug('Video received at %i timestamp', scene_timestamp)
self._process_camera_image(
timestamp=scene_timestamp,
image=scene_frame)
except KeyboardInterrupt:
pass
@DataFeatures.PipelineStepExit
def __exit__(self, exception_type, exception_value, exception_traceback):
logging.debug('Pupil-Labs context stops...')
# Close data stream
self._stop_event.set()
# Stop streaming
threading.Thread.join(self.__gaze_thread)
threading.Thread.join(self.__video_thread)
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