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# CMSampleBuffer.SamplePropertiesCollection

Fixed size collection of sample information.

```
struct SamplePropertiesCollection
```

## Overview

This collection contains one element for each sample in the sample buffer. The size of collection is fixed to
the number of samples in a sample buffer. Convenience static methods are available on timings & sizes to create
this collection by specifying just one value.

## Topics

### Initializers

[`init()`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/init())

Creates an empty collection.

[`init(some Collection<CMSampleBuffer.SampleProperties>)`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/init(_:))

[`init(sampleCount: Int, sizes: CMSampleBuffer.SizePerSample?, timings: CMSampleBuffer.TimingPerSample?, attachments: [CMSampleBuffer.SampleAttachments]?)`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/init(sampleCount:sizes:timings:attachments:))

Create a collection with specified sample information.

### Instance Properties

[`var attachments: [CMSampleBuffer.SampleAttachments]?`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/attachments)

Access sample attachments.

[`var count: Int`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/count)

The number of elements in the collection.

[`var endIndex: Int`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/endIndex)

The position one greater than the last valid subscript argument.

[`var sizes: CMSampleBuffer.SizePerSample?`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/sizes)

Access sample sizes.

[`var startIndex: Int`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/startIndex)

The position of the first element.

[`var timings: CMSampleBuffer.TimingPerSample?`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/timings)

Access sample timings.

### Subscripts

[`subscript(Int) -> CMSampleBuffer.SampleProperties`](/documentation/CoreMedia/CMSampleBuffer/SamplePropertiesCollection/subscript(_:))

Accesses the element at the specified position.

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

[`Collection`](/documentation/Swift/Collection)

[`ExpressibleByArrayLiteral`](/documentation/Swift/ExpressibleByArrayLiteral)

[`Escapable`](/documentation/Swift/Escapable)

[`Copyable`](/documentation/Swift/Copyable)

[`Sendable`](/documentation/Swift/Sendable)

[`RandomAccessCollection`](/documentation/Swift/RandomAccessCollection)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`MutableCollection`](/documentation/Swift/MutableCollection)

[`Sequence`](/documentation/Swift/Sequence)

[`BidirectionalCollection`](/documentation/Swift/BidirectionalCollection)

---

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