---
title: CMSampleBufferAttachmentKeyDefinitions
framework: coremedia
role: symbol
role_heading: Enumeration
path: coremedia/cmsamplebufferattachmentkeydefinitions
---

# CMSampleBufferAttachmentKeyDefinitions

A namespace for sample buffer attachment keys.

## Declaration

```swift
enum CMSampleBufferAttachmentKeyDefinitions
```

## Topics

### Type Properties

- [cameraIntrinsicMatrix](coremedia/cmsamplebufferattachmentkeydefinitions/cameraintrinsicmatrix.md)
- [displayEmptyMediaImmediately](coremedia/cmsamplebufferattachmentkeydefinitions/displayemptymediaimmediately.md)
- [drainAfterDecoding](coremedia/cmsamplebufferattachmentkeydefinitions/drainafterdecoding.md)
- [droppedFrameReason](coremedia/cmsamplebufferattachmentkeydefinitions/droppedframereason.md)
- [droppedFrameReasonInfo](coremedia/cmsamplebufferattachmentkeydefinitions/droppedframereasoninfo.md)
- [emptyMedia](coremedia/cmsamplebufferattachmentkeydefinitions/emptymedia.md)
- [endsPreviousSampleDuration](coremedia/cmsamplebufferattachmentkeydefinitions/endsprevioussampleduration.md)
- [fillDiscontinuitiesWithSilence](coremedia/cmsamplebufferattachmentkeydefinitions/filldiscontinuitieswithsilence.md)
- [forceKeyFrame](coremedia/cmsamplebufferattachmentkeydefinitions/forcekeyframe.md)
- [gradualDecoderRefresh](coremedia/cmsamplebufferattachmentkeydefinitions/gradualdecoderrefresh.md)
- [permanentEmptyMedia](coremedia/cmsamplebufferattachmentkeydefinitions/permanentemptymedia.md)
- [postNotificationWhenConsumed](coremedia/cmsamplebufferattachmentkeydefinitions/postnotificationwhenconsumed.md)
- [resetDecoderBeforeDecoding](coremedia/cmsamplebufferattachmentkeydefinitions/resetdecoderbeforedecoding.md)
- [resumeOutput](coremedia/cmsamplebufferattachmentkeydefinitions/resumeoutput.md)
- [reverse](coremedia/cmsamplebufferattachmentkeydefinitions/reverse.md)
- [speedMultiplier](coremedia/cmsamplebufferattachmentkeydefinitions/speedmultiplier.md)
- [stillImageLensStabilizationInfo](coremedia/cmsamplebufferattachmentkeydefinitions/stillimagelensstabilizationinfo.md)
- [transitionID](coremedia/cmsamplebufferattachmentkeydefinitions/transitionid.md)
- [trimDurationAtEnd](coremedia/cmsamplebufferattachmentkeydefinitions/trimdurationatend.md)
- [trimDurationAtStart](coremedia/cmsamplebufferattachmentkeydefinitions/trimdurationatstart.md)

## Relationships

### Conforms To

- [CVAttachmentKeyDefinitions](corevideo/cvattachmentkeydefinitions.md)