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# Input type atom ('  ty')

An atom that specifies how to interpret track input data.

## Overview

The input type atom is required; it specifies how the data is to be interpreted.

## Topics

### Data fields

[`Size`](/documentation/quicktime-file-format/Input_type_atom/Size)

A 32-bit integer that specifies the number of bytes in this input type atom.

[`Type`](/documentation/quicktime-file-format/Input_type_atom/Type)

A 32-bit integer that identifies the atom type.

[`Input type`](/documentation/quicktime-file-format/Input_type_atom/Input_type)

A 32-bit integer that specifies the type of data that is to be received from the secondary data source.


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