Created
October 1, 2019 01:52
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import time | |
# https://github.com/pupil-labs/pyndsi/tree/v1.0 | |
import ndsi # Main requirement | |
GAZE_TYPE = "gaze" # Type of sensors that we are interested in | |
SENSORS = {} # Will store connected sensors | |
def main(): | |
# Start auto-discovery of Pupil Invisible Companion devices | |
network = ndsi.Network(formats={ndsi.DataFormat.V4}, callbacks=(on_network_event,)) | |
network.start() | |
try: | |
# Event loop, runs until interrupted | |
while network.running: | |
# Check for recently connected/disconnected devices | |
if network.has_events: | |
network.handle_event() | |
# Iterate over all connected devices | |
for gaze_sensor in SENSORS.values(): | |
# Fetch recent sensor configuration changes, | |
# required for pyndsi internals | |
while gaze_sensor.has_notifications: | |
gaze_sensor.handle_notification() | |
# Fetch recent gaze data | |
for gaze in gaze_sensor.fetch_data(): | |
# Output: GazeValue(x, y, ts) | |
print(gaze_sensor, gaze) | |
time.sleep(0.1) | |
# Catch interruption and disconnect gracefully | |
except (KeyboardInterrupt, SystemExit): | |
network.stop() | |
def on_network_event(network, event): | |
# Handle gaze sensor attachment | |
if event["subject"] == "attach" and event["sensor_type"] == GAZE_TYPE: | |
# Create new sensor, start data streaming, | |
# and request current configuration | |
sensor = network.sensor(event["sensor_uuid"]) | |
sensor.set_control_value("streaming", True) | |
sensor.refresh_controls() | |
# Save sensor s.t. we can fetch data from it in main() | |
SENSORS[event["sensor_uuid"]] = sensor | |
print(f"Added sensor {sensor}...") | |
# Handle gaze sensor detachment | |
if event["subject"] == "detach" and event["sensor_uuid"] in SENSORS: | |
# Known sensor has disconnected, remove from list | |
SENSORS[event["sensor_uuid"]].unlink() | |
del SENSORS[event["sensor_uuid"]] | |
print(f"Removed sensor {event['sensor_uuid']}...") | |
main() # Execute example |
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