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# AVQueuedSampleBufferRendering

Methods you can implement to enqueue sample buffers for presentation.

```
protocol AVQueuedSampleBufferRendering : NSObjectProtocol
```

## Overview

[`AVSampleBufferDisplayLayer`](/documentation/AVFoundation/AVSampleBufferDisplayLayer) and [`AVSampleBufferAudioRenderer`](/documentation/AVFoundation/AVSampleBufferAudioRenderer) conform to this protocol. When used in conjunction with an [`AVSampleBufferRenderSynchronizer`](/documentation/AVFoundation/AVSampleBufferRenderSynchronizer), an object conforming to `AVQueuedSampleBufferRendering` can only be attached to a single synchronizer.

## Topics

### Requesting media

[`isReadyForMoreMediaData`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/isReadyForMoreMediaData)

A Boolean value that indicates whether the receiver is able to accept more sample buffers.

[`enqueue(_:)`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/enqueue(_:))

Sends a sample buffer to the queue for rendering.

[`requestMediaDataWhenReady(on:using:)`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/requestMediaDataWhenReady(on:using:))

Tells the target to invoke a client-supplied block in order to gather sample buffers for playback.

[`stopRequestingMediaData()`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/stopRequestingMediaData())

Cancels any current [`requestMediaDataWhenReady(on:using:)`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/requestMediaDataWhenReady(on:using:)) call.

### Determining playback readiness

[`hasSufficientMediaDataForReliablePlaybackStart`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/hasSufficientMediaDataForReliablePlaybackStart)

A Boolean value that indicates whether the enqued media meets the required preroll level for reliable playback.

### Clearing queued sample buffers

[`flush()`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/flush())

Discards all pending enqueued sample buffers.

### Indentifying the timebase

[`timebase`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/timebase)

The timebase for a renderer.


---

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