# FxKeyframeAPI_v3 A collection of methods for manipulating the keyframes of your FxPlug 4 plug-in. ``` protocol FxKeyframeAPI_v3 ``` ## Overview These methods allow you to get keyframe information about any parameter your plug-in has. You can also set keyframes, which can be useful for creating presets and automating common uses of your plug-ins. ## Topics ### Instance Methods [`func add(UnsafePointer, toParameter: Int, andChannel: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/add(_:toParameter:andChannel:)) Adds a keyframe at the given time. [`func channelCount(UnsafeMutablePointer, forParameter: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/channelCount(_:forParameter:)) Returns the number of channels in a parameter. [`func keyframe(UnsafeMutablePointer, atOrAfter: CMTime, fromParameter: Int, andChannel: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/keyframe(_:atOrAfter:fromParameter:andChannel:)) Returns the info about the nearest next keyframe. [`func keyframe(UnsafeMutablePointer, atOrBefore: CMTime, fromParameter: Int, andChannel: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/keyframe(_:atOrBefore:fromParameter:andChannel:)) Returns the info about the nearest previous keyframe. [`func keyframe(UnsafeMutablePointer, forParameter: Int, channel: Int, andIndex: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/keyframe(_:forParameter:channel:andIndex:)) Returns the keyframe info for the keyframe at a given index. [`func keyframeCount(UnsafeMutablePointer, forParameter: Int, andChannel: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/keyframeCount(_:forParameter:andChannel:)) Returns the number of keyframes for a parameter’s channel. [`func parameter(Int, channel: Int, hasKeyframe: UnsafeMutablePointer, at: CMTime) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/parameter(_:channel:hasKeyframe:at:)) Tells whether there is a keyframe at a given time. [`func removeAllKeyframes(forParameter: Int, andChannel: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/removeAllKeyframes(forParameter:andChannel:)) Remove all keyframes from the given parameter’s channel. [`func removeKeyframe(at: Int, fromParameter: Int, andChannel: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/removeKeyframe(at:fromParameter:andChannel:)) Removes the keyframe at the given index. [`func setKeyframeIndex(Int, with: UnsafePointer, forParameter: Int, andChannel: Int) -> (any Error)?`](/documentation/professional_video_applications/FxKeyframeAPI_v3/setKeyframeIndex(_:with:forParameter:andChannel:)) Sets the keyframe at the given index to have the given info. ### Structure [`struct FxKeyframe`](/documentation/professional_video_applications/FxKeyframe) ### Constants [`typealias FxKeyframeStyle`](/documentation/professional_video_applications/FxKeyframeStyle) Constants for specifying the type of keyframe. [`var kFxKeyframe_V3: Int32`](/documentation/professional_video_applications/kFxKeyframe_V3) [`var kFxKeyframe_CurrentVersion: Int32`](/documentation/professional_video_applications/kFxKeyframe_CurrentVersion) --- 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)