# isReadyForMoreMediaData A Boolean value that indicates whether the receiver is able to accept more sample buffers. ``` var isReadyForMoreMediaData: Bool { get } ``` ## Discussion An object conforming to `AVQueuedSampleBufferRendering` keeps track of the occupancy levels of its internal queues for the benefit of clients that enqueue sample buffers from non-real-time sources, for example, clients that can supply sample buffers faster than they are consumed, and so need to decide when to hold back. Clients enqueueing sample buffers from non-real-time sources may hold off from generating or obtaining more sample buffers to enqueue when the value of `readyForMoreMediaData` is `NO`. It is safe to call [`enqueue(_:)`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/enqueue(_:)) when `readyForMoreMediaData` is `NO`, but don’t enqueue sample buffers without bound. To help with control of the non-real-time supply of sample buffers, clients can call [`requestMediaDataWhenReady(on:using:)`](/documentation/AVFoundation/AVQueuedSampleBufferRendering/requestMediaDataWhenReady(on:using:)) in order to specify a block that the receiver should invoke whenever it’s ready for sample buffers to be appended. The value of `readyForMoreMediaData` often changes` from `NO` to `YES` asynchronously, as previously supplied sample buffers are decoded and rendered. This property is not key-value observable. --- Copyright © 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)