# Sample Buffer Notifications Notifications the system posts when processing sample buffer objects. ## Topics ### Sample Buffer Notifications [`let kCMSampleBufferNotification_DataBecameReady: CFString`](/documentation/CoreMedia/kCMSampleBufferNotification_DataBecameReady) Posted on a sample buffer by the [`CMSampleBufferSetDataReady(_:)`](/documentation/CoreMedia/CMSampleBufferSetDataReady(_:)) function when the buffer becomes ready. [`let kCMSampleBufferNotification_DataFailed: CFString`](/documentation/CoreMedia/kCMSampleBufferNotification_DataFailed) [`let kCMSampleBufferNotificationParameter_OSStatus: CFString`](/documentation/CoreMedia/kCMSampleBufferNotificationParameter_OSStatus) [`let kCMSampleBufferConsumerNotification_BufferConsumed: CFString`](/documentation/CoreMedia/kCMSampleBufferConsumerNotification_BufferConsumed) Optionally posted when a sample buffer is consumed. ### Sample Buffer Conduit Notifications [`let kCMSampleBufferConduitNotification_ResetOutput: CFString`](/documentation/CoreMedia/kCMSampleBufferConduitNotification_ResetOutput) Posted on a conduit of sample buffers to request invalidation of pending output data. [`let kCMSampleBufferConduitNotification_InhibitOutputUntil: CFString`](/documentation/CoreMedia/kCMSampleBufferConduitNotification_InhibitOutputUntil) Posted on a conduit of sample buffers to announce a coming discontinuity. [`let kCMSampleBufferConduitNotification_UpcomingOutputPTSRangeChanged: CFString`](/documentation/CoreMedia/kCMSampleBufferConduitNotification_UpcomingOutputPTSRangeChanged) Posted on a conduit of video sample buffers to report information about the range of upcoming output presentation timestamps. [`let kCMSampleBufferConduitNotificationParameter_UpcomingOutputPTSRangeMayOverlapQueuedOutputPTSRange: CFString`](/documentation/CoreMedia/kCMSampleBufferConduitNotificationParameter_UpcomingOutputPTSRangeMayOverlapQueuedOutputPTSRange) Indicates that the presentation timestamps of upcoming output samples may overlap those of samples queued for output (type `CFBoolean`). [`let kCMSampleBufferConduitNotificationParameter_MinUpcomingOutputPTS: CFString`](/documentation/CoreMedia/kCMSampleBufferConduitNotificationParameter_MinUpcomingOutputPTS) Specifies the minimum presentation timestamp of upcoming output samples (type `CFDictionary`). [`let kCMSampleBufferConduitNotificationParameter_MaxUpcomingOutputPTS: CFString`](/documentation/CoreMedia/kCMSampleBufferConduitNotificationParameter_MaxUpcomingOutputPTS) Specifies the maximum presentation timestamp of upcoming output samples (type `CFDictionary`). [`let kCMSampleBufferConduitNotificationParameter_ResumeTag: CFString`](/documentation/CoreMedia/kCMSampleBufferConduitNotificationParameter_ResumeTag) Specifies a tag to be attached to the first sample buffer following a discontinuity (type `CFNumber`). --- 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)