# PlaybackDatasetLoader

Source: https://www.nianticspatial.com/docs/api/swift/NSDK.class-PlaybackDatasetLoader/

PlaybackDatasetLoader

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## Declaration

class PlaybackDatasetLoader

## Summary

Base class for loading playback dataset data from various sources.
This class provides a base implementation that must be subclassed. Subclasses must override
`loadCaptureJSON()`, `loadImage(imageName:)`, `loadDepthData(depthFileName:)`, and
`loadDepthConfidence(confidenceFileName:)` to provide concrete implementations.
The loader uses on-demand loading - only the capture JSON is loaded upfront, and frame
images/depth data are loaded when requested by `PlaybackDataset`.

> **Info:**
>
> **Notice**
>
> Note: This class acts as an abstract base class. Do not instantiate directly.

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## Constructors

init()

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## Methods

| Name | Type | Summary |
| --- | --- | --- |
| info | String | Returns details about the loader configuration. |
| loadCaptureJSON | Data? | Loads the capture JSON data from the data source.This method must be overridden by subclasses. The base implementation reports themissing override and returns `nil`. |
| loadDataset | PlaybackDataset? | Loads a dataset from the data source.This method only loads the capture JSON metadata upfront. Frame images and depth dataare loaded on-demand when requested, reducing memory pressure for large datasets. |
| loadDepthConfidence | Data? | Loads depth confidence data from the data source.This method must be overridden by subclasses. The base implementation reports themissing override and returns `nil`.Called on-demand when confidence data is requested. |
| loadDepthData | Data? | Loads depth data from the data source.This method must be overridden by subclasses. The base implementation reports themissing override and returns `nil`.Called on-demand when depth data is requested. |
| loadImage | CGImage? | Loads an image from the data source.This method must be overridden by subclasses. The base implementation reports themissing override and returns `nil`.Called on-demand when a frame image is requested. |

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## Relationships

conforms to:  PlaybackDatasetSource 

derived:  BundlePlaybackDatasetLoader