# CMBufferQueueInstallTriggerWithIntegerThreshold(_:callback:refcon:condition:threshold:triggerTokenOut:) Installs a trigger with a callback and threshold on a buffer queue. ``` func CMBufferQueueInstallTriggerWithIntegerThreshold(_ queue: CMBufferQueue, callback: CMBufferQueueTriggerCallback?, refcon: UnsafeMutableRawPointer?, condition: CMBufferQueueTriggerCondition, threshold: CMItemCount, triggerTokenOut: UnsafeMutablePointer?) -> OSStatus ``` ## Parameters `queue` `CMBufferQueue` on which the trigger is being set. `callback` Callback to be called when the trigger condition becomes true. Can be `NULL`, if client intends only to explicitly test the condition. Cannot be `NULL` if triggerTokenOut is NULL, otherwise the trigger would be meaningless. `refcon` Refcon to be passed to the triggerCallback. Can be `NULL` if the callback doesn’t need it, or is itself `NULL`.`` `condition` The condition to be tested when evaluating the trigger. Must be a valid condition for an integer threshold. `threshold` The integer value to compare against when evaluating the trigger. `triggerTokenOut` Address where created trigger token will be written. Can be `NULL`, if client has no need to explicitly test or remove the trigger. Cannot be `NULL` if triggerCallback is NULL, since the trigger would be meaningless then. ## Return Value A result code. See `Result Codes` ## Discussion This function behaves the same way as [`CMBufferQueueInstallTrigger(_:callback:refcon:condition:time:triggerTokenOut:)`](/documentation/CoreMedia/CMBufferQueueInstallTrigger(_:callback:refcon:condition:time:triggerTokenOut:)) except the trigger is evaluated against the integer value rather than the time value. --- 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)