1# video_output.h 2 3 4## Overview 5 6The **video_output.h** file declares the video output concepts. 7 8**Library**: libohcamera.so 9 10**System capability**: SystemCapability.Multimedia.Camera.Core 11 12**Since**: 11 13 14**Related module**: [OH_Camera](_o_h___camera.md) 15 16 17## Summary 18 19 20### Structs 21 22| Name| Description| 23| -------- | -------- | 24| [VideoOutput_Callbacks](_video_output___callbacks.md) | Defines the callbacks used for video output.| 25 26 27### Types 28 29| Name| Description| 30| -------- | -------- | 31| [Camera_VideoOutput](_o_h___camera.md#camera_videooutput) | Defines the video output object.| 32| (\*[OH_VideoOutput_OnFrameStart](_o_h___camera.md#oh_videooutput_onframestart)) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput) | Defines the pointer to the callback defined in the [VideoOutput_Callbacks](_video_output___callbacks.md) struct and used to report video output frame start events.| 33| (\*[OH_VideoOutput_OnFrameEnd](_o_h___camera.md#oh_videooutput_onframeend)) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput, int32_t frameCount) | Defines the pointer to the callback defined in the [VideoOutput_Callbacks](_video_output___callbacks.md) struct and used to report video output frame end events.| 34| (\*[OH_VideoOutput_OnError](_o_h___camera.md#oh_videooutput_onerror)) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput, [Camera_ErrorCode](_o_h___camera.md#camera_errorcode) errorCode) | Defines the pointer to the callback defined in the [VideoOutput_Callbacks](_video_output___callbacks.md) struct and used to report video output errors.| 35| [VideoOutput_Callbacks](_o_h___camera.md#videooutput_callbacks) | Defines the callbacks used for video output.| 36 37 38### Functions 39 40| Name| Description| 41| -------- | -------- | 42| [OH_VideoOutput_RegisterCallback](_o_h___camera.md#oh_videooutput_registercallback) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput, [VideoOutput_Callbacks](_video_output___callbacks.md) \*callback) | Registers a callback to listen for video output events.| 43| [OH_VideoOutput_UnregisterCallback](_o_h___camera.md#oh_videooutput_unregistercallback) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput, [VideoOutput_Callbacks](_video_output___callbacks.md) \*callback) | Unregisters the callback used to listen for video output events.| 44| [OH_VideoOutput_Start](_o_h___camera.md#oh_videooutput_start) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput) | Starts video output.| 45| [OH_VideoOutput_Stop](_o_h___camera.md#oh_videooutput_stop) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput) | Stops video output.| 46| [OH_VideoOutput_Release](_o_h___camera.md#oh_videooutput_release) ([Camera_VideoOutput](_o_h___camera.md#camera_videooutput) \*videoOutput) | Releases a **VideoOutput** instance.| 47