---
title: MPEG4ObjectID
framework: coreaudiotypes
role: symbol
role_heading: Enumeration
path: coreaudiotypes/mpeg4objectid
---

# MPEG4ObjectID

Constants that define the type of MPEG-4 audio data.

## Declaration

```swift
enum MPEG4ObjectID
```

## Topics

### Constants

- [MPEG4ObjectID.AAC_LC](coreaudiotypes/mpeg4objectid/aac_lc.md)
- [MPEG4ObjectID.AAC_LTP](coreaudiotypes/mpeg4objectid/aac_ltp.md)
- [MPEG4ObjectID.aac_Main](coreaudiotypes/mpeg4objectid/aac_main.md)
- [MPEG4ObjectID.AAC_SBR](coreaudiotypes/mpeg4objectid/aac_sbr.md)
- [MPEG4ObjectID.AAC_SSR](coreaudiotypes/mpeg4objectid/aac_ssr.md)
- [MPEG4ObjectID.aac_Scalable](coreaudiotypes/mpeg4objectid/aac_scalable.md)
- [MPEG4ObjectID.CELP](coreaudiotypes/mpeg4objectid/celp.md)
- [MPEG4ObjectID.HVXC](coreaudiotypes/mpeg4objectid/hvxc.md)
- [MPEG4ObjectID.twinVQ](coreaudiotypes/mpeg4objectid/twinvq.md)

### Initializers

- [init(rawValue:)](coreaudiotypes/mpeg4objectid/init(rawvalue:).md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Streams

- [AudioStreamBasicDescription](coreaudiotypes/audiostreambasicdescription.md)
- [AudioStreamPacketDescription](coreaudiotypes/audiostreampacketdescription.md)
- [AudioFormatFlags](coreaudiotypes/audioformatflags.md)
- [Audio Format Flags](coreaudiotypes/audio-format-flags.md)
- [AudioFormatID](coreaudiotypes/audioformatid.md)
- [Audio Format Identifiers](coreaudiotypes/audio-format-identifiers.md)
- [kAudioStreamAnyRate](coreaudiotypes/kaudiostreamanyrate.md)