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Data playback context
======================
The context handles incoming eye tracker data before to pass them to a processing pipeline.
## data_playback_context.json
For this use case we need to read Tobii Pro Glasses 2 records: **ArGaze** provides a [ready-made context](../../user_guide/eye_tracking_context/context_modules/tobii_pro_glasses_2.md) class to playback data from records made by this device.
While *segment* entry is specific to the [TobiiProGlasses2.SegmentPlayback](../../argaze.md/#argaze.utils.contexts.TobiiProGlasses2.SegmentPlayback) class, *name* and *pipeline* entries are part of the parent [ArContext](../../argaze.md/#argaze.ArFeatures.ArContext) class.
```json
{
"argaze.utils.contexts.TobiiProGlasses2.SegmentPlayback": {
"name": "Tobii Pro Glasses 2 segment playback",
"segment": "/Volumes/projects/fbr6k3e/records/4rcbdzk/segments/1",
"pipeline": "post_processing_pipeline.json"
}
}
```
The [post_processing_pipeline.json](pipeline.md) file mentioned above is described in the next chapter.
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