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# Sample dependency flags atom ('sdtp')

An atom that uses one byte per sample as a bit field that describes dependency information.

## Overview

The sample dependency flags atom has a type of `'sdtp'`.

The layout of a sample dependency flags atom is as follows.

|Sample dependency flags atom data field                                                                                |Bytes   |
|-----------------------------------------------------------------------------------------------------------------------|--------|
|``doc://com.apple.qtff/documentation/quicktime-file-format/Sample_dependency_flags_atom/Size``                         |4       |
|``doc://com.apple.qtff/documentation/quicktime-file-format/Sample_dependency_flags_atom/Type`` = `'sdtp'`              |4       |
|``doc://com.apple.qtff/documentation/quicktime-file-format/Sample_dependency_flags_atom/Version``                      |1       |
|``doc://com.apple.qtff/documentation/quicktime-file-format/Sample_dependency_flags_atom/Flags``                        |3       |
|``doc://com.apple.qtff/documentation/quicktime-file-format/Sample_dependency_flags_atom/Sample_dependency_flags_table``|Variable|

## Topics

### Data fields

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

A 32-bit integer that specifies the number of bytes in the sample dependency flags atom.

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

A 32-bit integer that identifies the atom type.

[`Version`](/documentation/quicktime-file-format/Sample_dependency_flags_atom/Version)

A 1-byte specification of the version of this atom.

[`Flags`](/documentation/quicktime-file-format/Sample_dependency_flags_atom/Flags)

A 3-byte space reserved for flags.

[`Sample dependency flags table`](/documentation/quicktime-file-format/Sample_dependency_flags_atom/Sample_dependency_flags_table)

A table of 8-bit values indicating the sample flag settings.


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