harmony 鸿蒙preview_output.h
preview_output.h
Overview
The preview_output.h file declares the preview output concepts.
Library: libohcamera.so
File to include: <ohcamera/preview_output.h>
System capability: SystemCapability.Multimedia.Camera.Core
Since: 11
Related module: OH_Camera
Summary
Structs
| Name | Description |
|---|---|
| struct PreviewOutput_Callbacks | Describes the callbacks related to preview output. |
Types
| Name | Description |
|---|---|
| typedef struct Camera_PreviewOutput Camera_PreviewOutput | Defines a struct for the preview output object. |
| typedef void(* OH_PreviewOutput_OnFrameStart) (Camera_PreviewOutput *previewOutput) | Defines the callback defined in the PreviewOutput_Callbacks struct and used to report preview output frame start events. |
| typedef void(* OH_PreviewOutput_OnFrameEnd) (Camera_PreviewOutput *previewOutput, int32_t frameCount) | Defines the callback defined in the PreviewOutput_Callbacks struct and used to report preview output frame end events. |
| typedef void(* OH_PreviewOutput_OnError) (Camera_PreviewOutput *previewOutput, Camera_ErrorCode errorCode) | Defines the callback defined in the PreviewOutput_Callbacks struct and used to report preview output errors. |
| typedef struct PreviewOutput_Callbacks PreviewOutput_Callbacks | Defines a struct for the callbacks related to preview output. |
Functions
| Name | Description |
|---|---|
| Camera_ErrorCode OH_PreviewOutput_RegisterCallback (Camera_PreviewOutput *previewOutput, PreviewOutput_Callbacks *callback) | Registers a callback to listen for preview output events. |
| Camera_ErrorCode OH_PreviewOutput_UnregisterCallback (Camera_PreviewOutput *previewOutput, PreviewOutput_Callbacks *callback) | Unregisters the callback used to listen for preview output events. |
| Camera_ErrorCode OH_PreviewOutput_Start (Camera_PreviewOutput *previewOutput) | Starts preview output. |
| Camera_ErrorCode OH_PreviewOutput_Stop (Camera_PreviewOutput *previewOutput) | Stops preview output. |
| Camera_ErrorCode OH_PreviewOutput_Release (Camera_PreviewOutput *previewOutput) | Releases a PreviewOutput instance. |
| Camera_ErrorCode OH_PreviewOutput_GetActiveProfile (Camera_PreviewOutput *previewOutput, Camera_Profile **profile) | Obtains the profile of a PreviewOutput instance. |
| Camera_ErrorCode OH_PreviewOutput_DeleteProfile (Camera_Profile *profile) | Deletes the profile of this PreviewOutput instance. |
| Camera_ErrorCode OH_PreviewOutput_GetSupportedFrameRates (Camera_PreviewOutput *previewOutput, Camera_FrameRateRange **frameRateRange, uint32_t *size) | Obtains the list of frame rates supported by a PreviewOutput instance. |
| Camera_ErrorCode OH_PreviewOutput_DeleteFrameRates (Camera_PreviewOutput *previewOutput, Camera_FrameRateRange *frameRateRange) | Deletes the frame rate list. |
| Camera_ErrorCode OH_PreviewOutput_SetFrameRate (Camera_PreviewOutput *previewOutput, int32_t minFps, int32_t maxFps) | Sets the frame rates for a PreviewOutput instance. |
| Camera_ErrorCode OH_PreviewOutput_GetActiveFrameRate (Camera_PreviewOutput *previewOutput, Camera_FrameRateRange *frameRateRange) | Obtains the active frame rates of a PreviewOutput instance. |
| Camera_ErrorCode OH_PreviewOutput_GetPreviewRotation (Camera_PreviewOutput *previewOutput, int displayRotation, Camera_ImageRotation *imageRotation) | Obtains the preview rotation angle. |
| Camera_ErrorCode OH_PreviewOutput_SetPreviewRotation (Camera_PreviewOutput *previewOutput, Camera_ImageRotation *previewRotation, bool isDisplayLocked) | Sets the preview rotation angle. |
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