<!--
{
  "availability" : [

  ],
  "documentType" : "symbol",
  "framework" : "QuickTime File Format",
  "identifier" : "/documentation/quicktime-file-format/Input_type_atom/Input_type",
  "metadataVersion" : "0.1.0",
  "role" : "Data field",
  "symbol" : {
    "kind" : "Data field",
    "modules" : [
      "QuickTime File Format"
    ],
    "preciseIdentifier" : "__docc_universal_symbol_reference_$Input_type_atom_Input_type"
  },
  "title" : "Input type"
}
-->

# Input type

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

## Overview

Valid values for this field are as follows.

|Input identifier                  |Value   |Description                                                                                                                                                      |
|----------------------------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
|`kTrackModifierTypeMatrix`        |1       |A 3 × 3 transformation matrix to transform the track’s location, scaling, and so on.                                                                             |
|`kTrackModifierTypeClip`          |2       |A QuickDraw clipping region to change the track’s shape.                                                                                                         |
|`kTrackModifierTypeVolume`        |3       |An 8.8 fixed-point value indicating the relative sound volume. This is used for fading the volume.                                                               |
|`kTrackModifierTypeBalance`       |4       |A 16-bit integer indicating the sound balance level. This is used for panning the sound location.                                                                |
|`kTrackModifierTypeGraphicsMode`  |5       |A graphics mode record (32-bit integer indicating graphics mode, followed by an RGB color) to modify the track’s graphics mode for visual fades.                 |
|`kTrackModifierObjectMatrix`      |6       |A 3 × 3 transformation matrix to transform an object within the track’s location, scaling, and so on.                                                            |
|`kTrackModifierObjectGraphicsMode`|7       |A graphics mode record (32-bit integer indicating graphics mode, followed by an RGB color) to modify an object within the track’s graphics mode for visual fades.|
|`kTrackModifierTypeImage`         |`'vide’`|Compressed image data for an object within the track. Note that this was `kTrackModifierTypeSpriteImage`.                                                        |

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)