This is a simple Lab Stream Layer interface to acquire data from a Tobii Eye Tracker, using the Tobii Pro SDK.
It does NOT work with the previous Tobii Pro Analytics SDK 3, which is a somewhat different API and -- in particular -- has very different timing and synchronization models.
It works by connecting to an attached eye tracker (it uses the first one it finds, including any local USB connected devices; edit the code if you want something else), installs a licence (if you need that), and creates a stream outlet that pushes data from the eye tracker onto the lab streaming layer.
To use it, simply install the dependencies (python 2.7 and the libraries pylsl, tobii_research and numpy in particular) and type from a command prompt:
python ./tobiilsl.py
This will start the stream outlet. It will print out the (local) timestamp on the console, and every 5 seconds, a log of the current time and how many packages has been transmitted. Halt it with escape or pressing ctrl-c several times.
Calibration needs to be done prior to starting the acquisition interface using other (Tobii) tools.
The tobiilsl.py interface uses the system timestamp that it receives from the Tobii API, thus compensating for any lag and jitter in the tobiilsl.py interface itself. On most installations, the difference between this timestamp and when the package is injected to the stream outlet is small. Note that the system timestamp created by the Tobii API is synchronized automatically with the device timestamp, so it is a better approximation of the real acquisition timestamp than when the package is being injected into the stream outlet.
It is currently tested with Python 2.7 and runs under Windows 10; it has not been tested on other platforms (partly because the Tobii
Created by Per Baekgaard / [email protected] / [email protected], Juni 2018
Licensed under the MIT License:
Copyright (c) 2018, Per Baekgaard, Technical University of Denmark, DTU Compute, Cognitive Systems Section
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