1# PreviewOutput_Callbacks 2<!--Kit: Camera Kit--> 3<!--Subsystem: Multimedia--> 4<!--Owner: @qano--> 5<!--SE: @leo_ysl--> 6<!--TSE: @xchaosioda--> 7 8## Overview 9 10The struct describes the callbacks related to preview output. 11 12**Since**: 11 13 14**Related module**: [OH_Camera](capi-oh-camera.md) 15 16**Header file**: [preview_output.h](capi-preview-output-h.md) 17 18## Summary 19 20### Member Variables 21 22| Name| Description| 23| -- | -- | 24| [OH_PreviewOutput_OnFrameStart](capi-preview-output-h.md#oh_previewoutput_onframestart) onFrameStart | Callback to report preview output frame start events.| 25| [OH_PreviewOutput_OnFrameEnd](capi-preview-output-h.md#oh_previewoutput_onframeend) onFrameEnd | Callback to report preview output frame end events.| 26| [OH_PreviewOutput_OnError](capi-preview-output-h.md#oh_previewoutput_onerror) onError | Callback to report preview output errors.| 27