Data capture context ==================== The context handles incoming eye tracker data before to pass them to a processing pipeline. ## live_streaming_context.json For this use case we need to connect to a Tobii Pro Glasses 2 device: **ArGaze** provides a [ready-made context](../../user_guide/eye_tracking_context/context_modules/tobii_pro_glasses_2.md) class to capture data from this device. While *address*, *project*, *participant* and *configuration* entries are specific to the [TobiiProGlasses2.LiveStream](../../argaze.md/#argaze.utils.contexts.TobiiProGlasses2.LiveStream) class, *name*, *pipeline* and *observers* entries are part of the parent [ArContext](../../argaze.md/#argaze.ArFeatures.ArContext) class. ```json { "argaze.utils.contexts.TobiiProGlasses2.LiveStream": { "name": "Tobii Pro Glasses 2 live stream", "address": "10.34.0.17", "project": "HAIKU-XP", "participant": "Pilot-A", "configuration": { "sys_ec_preset": "Indoor", "sys_sc_width": 1920, "sys_sc_height": 1080, "sys_sc_fps": 25, "sys_sc_preset": "Auto", "sys_et_freq": 50, "sys_mems_freq": 100 }, "pipeline": "live_processing_pipeline.json", "observers": { "observers.IvyBus": { "name": "argaze_haiku", "bus": "10.34.127.255:2023" } } } } ``` The [live_processing_pipeline.json](pipeline.md) file mentioned above is described in the next chapter. The *IvyBus* observer object is defined into the [observers.py](observers.md) file that is described in a next chapter.