---
title: Data reference index
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/hint_track_sample_description/data_reference_index
---

# Data reference index

A field that indirectly specifies where to find the hint track sample data.

## Overview

Overview The data reference is a file or resource specified by the data reference atom ('dref') inside the data information atom ('dinf') of the hint track. The data information atom can contain a table of data references, and the data reference index is a 16-bit integer that tells you which entry in that table should be used. Normally, the hint track has a single data reference, and this index entry is set to 0.

## See Also

### Data fields

- [Size](quicktime-file-format/hint_track_sample_description/size.md)
- [Data format](quicktime-file-format/hint_track_sample_description/data_format.md)
- [Reserved](quicktime-file-format/hint_track_sample_description/reserved.md)
- [Hint track version](quicktime-file-format/hint_track_sample_description/hint_track_version.md)
- [Last compatible hint track version](quicktime-file-format/hint_track_sample_description/last_compatible_hint_track_version.md)
- [Max packet size](quicktime-file-format/hint_track_sample_description/max_packet_size.md)
- [Additional data table](quicktime-file-format/hint_track_sample_description/additional_data_table.md)